CA2125972C

CA2125972C - Refilling container

Info

Publication number: CA2125972C
Application number: CA002125972A
Authority: CA
Inventors: Shinsaku Nakazato; Toshiyuki Yokoyama
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 1992-10-16
Filing date: 1993-10-14
Publication date: 2003-12-16
Anticipated expiration: 2013-10-14
Also published as: US5609266A; WO1994008860A1; AU5161293A; CA2125972A1; KR100293102B1; AU674708B2; EP0618143A1; EP0618143B1; EP0618143A4

Abstract

The refilling container of the present invention is a simplified container for use in containing a refilling detergent and the like. A number of the refilling containers can be laied at a limited space. The refilling container can be refilled with a content easily and surely, and can be disposed easily. The refilling container is comprised of a thermoformed container body and a seal film for sealing an opening positioned at the lower end of the container body. A
tapered cylindrical shoulder portion is continuously connected to the upper end of the barrel portion of the container body, and from the center portion of the shoulder portion, a nozzle cylinder 4 closed by a platen 21 at the extreme end thereof extends upwardly, In case of such as refilling a content in the container body or displaying the refilling container after filled with a content, the refilling container is converted to the state of the shoulder portion being subsided in the barrel portion, while in case of reffilling a content in another container, it is converted to the state of the shoulder portion being projected from the barrel portion and then the extreme end of the nozzle cylinder is cut to form an injection port.

Description

REI~ TLLING CONTAINER
Technical Fie7_d The present invention relates to a simplified refilling container fcr use in conta:in:ing detergents, shampoos and the like.
Background Art.
Containers far containing detergents, shampoos and the like are required tc: satisfy the conditions such as (1) being able to fully cont~a:in a content, ;2) being able to open and close repeatedly, (3) being able to inject a content stably and wit~uout troubles, and (4) being easy to handle. As such a container, bottle containers are generally employed i.n ~:rm pr_for art.
Containers capable of sati:~fying these conditions are complicat~:d in strmc:ture, so that= they require many processes in t:he product~iort thereof and a comparatively great deal of a materi. a'w ir_ molding the material into one container to thereby :inc:rease a unit price of production.
While, these containers c:an be reused sufficiently without any inconvenience since these conditions are not:
lost even after the content of the cont=ainers is exhausted.
However, these containers have hitherto been disposed. As above-mentioned, disposal of the cont=ainers does not meet with a requirement to nurse resourc:e:~ and it. is difficult to burn out the ~~~ontainers, because thecae containers are made of a comparatively laz~:~c> amount of a syr~thetic resin material.
In order t.o eliminate these disadvantages, a consuming cycle gains public favor, in which a content :such as detergents, shampo<:as and the like is contained in a simplified refilling c:~ontainer and the content contained therein is refilled ire the exhausted bottle container to use the same content.
p Conventional. refilling containers broadly used include self-standing np containers molded :in the form of a bag. Such a :refi.llinc~ container has the superior advantages that a unit price o.f l:~roduction is extremely low and also it can be easily disposed.
Though the conventional bag-shaped refilling container is opened by cutting a corner thereof with scissors and the like, the shape of the opening can not be constant in such a manner. When t:he shape of the opening is not constant as such, a content in the refilling container is spilt outside another container upor~~ refilling it in the other container.
Particularly, when thE:~ other container has a small-sized opening such as a bottle container, the r_ontent is easily spilt. Further, the mefilling container is soft in its entirety and lacks self-shape holdability, so that the entire container should be supported by both hands during refilling operation. Thus, whorl. the .refilling work is effected by one person, another container to be refilled can not be supported by his hands. As a res;~lt the refilling work of the content is effected in a unstable state.
In addition, even if the refilling operation :is effected while supporting another container by both hands, the refilling operation of the c:or~te:nt becomes unstable and thus the content may b~e easily spilt since the entire shape of the refilling container changes as the content flows out and the shape of the c:pening of the container also changes in accordance therewith.

The refilling container is extremely low in self-shape he>ldability, so that when the container is displayed in the states of self-standing up in a shop, t:he refilling container i:a bent halfway unsightly. Furthermore, there is a problem th~:~t only a few commodities (refilli:ng containers) can be di~aplayed at a given space because these refilling containers cyan not be stacked one upon another.
These refill..ing containers include also those having a bag-shaped container body provided with an 1() injection port having a. cap, the injection pert consisting of separate parts from the container body. In such a refil_Ling container, there is a fear that not only a production cost increases uselessly but also sealing and containing ability decreases since t: he injection port 15 capable of repeatedly wsinc~ is prc>vided in the container body which is a throwaway part.
An object of the present. invention is to provide a refilling container excellent in self-shape holdability;
capable of refilling ~;. cont:ent with ease and success;
20 advantageous =Ln such a.s transportation, storage and display;
and capable of disposing easily, and to provide a method suitable for producing the refilling container.
Disclosure of the Invention A refilling container according to the present 25 invention comprises (a.a thin container body and (b) a seal film molten-adhered tru.ereto. Th.e container body is prey?ared by thermoforming a synthetic resin sheet, and comprises:
(1) a cylind.r:i.cal barrel portion having an upper end and an open lower end, (2) an outwardly overhanging-flange formed integrally with and circ~~~mferentiall.y on an edge of the open lower end of the barrel portion, (3) a tapered cylindrical ;shoulder portion continuously connected to the upper end of t:he barrel portion, (4) a short-~::,rlindrical nozzle portion continuously connected *~o and standing up from a center portion of the shoulder portion, axed (5) a platen c=posing a top of the nozzle portion.
The seal film v'Ls molten-adhered to a lower surface of the flange of the container body i_or sealing up the open lower end of the container_ body.
The ref_ill.ing container constructed as above has a high self-shape holdability and is convenient in transportation, storage, display or the like.
Preferably, the barrel portion of the container body i.s shaped in the fox-m of a tapered cylinder having a diameter, decreasing upwardly, and i:~ provided with a step portion projecting outwax-dly at the 7_ower end of the barrel portion, an outer diam~et:c~r of the step portion being larger than an inner diameter of the opening at the lower end c>f the barrel portion. This allows that: t:he containers are prevented from being strorrgZ.y fitted in cne another so as not to be pulled out, ~~Nherr they were stacked prior to filling a content. The taper of the shoulder portion may be linear or arcuate. Us,:~ble c;ross--sectional shape of the nozzle cylindf~r may be various shapes such as circular, eliptic, rect;~ngular.

Best ways tc; use the refilling containers are as follows: in case of filling a content in the refilling container, or in case of transporting, storing or displaying the refilling containE:~r after filled with a content, these refilling containers pure used after the shoulder portion is subsided inside the b~,~.rrel portion. In case of refilling a content filled in the :.refilling container into another container, the refilling container is used after the shoulder portion is tl.arned over and projected from the barrel portion.
It :is prefer:~red that at least one tapered supplemental shoulder portion, of which taper reduces upwardly in diameter, is formed between the barrel portion and the shoulder portion. 'This al..lows for two or more 1~~ refraction points to 1>e formed between the shoulder portion and the barrel portion. to effect. the turn-over at these two points, whereby the turn-over action can be effected very easily. In this case, a size relation among the thickness t1 of the flange, the thickness t2 of the step portion, the thickness t3 of the lower portion of the barrel portion, the thickness t4 of the upper portion of t:he barrel portion, the thickness t5 of the su.pp:lemental shoulder portion, the thickness t6 of the shoulder portion and the thickness 1~7 of the nozzle cylinder i~=, preferred to be 2~~ t1 > t6 > t2 > t3 >_ t4 > t5 > t? with the thickness of i~he flange t1 being preferred to be 0.4 mm-1.0 mm.
It is also ~:~referred to foam a reinforcing ring circularly surrounding the shoulder portion between the barrel portion and the shoulder portion. Upon forming 1=he 3G reinforcing ring, the turn--over action of the shoulder portion is ready to be effected and also a strain can not occur at the connected portion of the barrel portion to the shoulder portion. A ~>referably reinforcing .ring has substantially the same surface as a virtually flat surface including an entire outer circumferential edge of the shoulder portion, or a. sloped surfaces sloping downwardly ~~ toward a center of the ,shoulder po=rtion. The sloped surface can be also constituted by a convex-curved surface upwardly projecting. The supplemental shou:ld~~r portion may be formed between the reinforcing :ring and t2Ze barrel portion.
Furthermore, the shoulder portion :is preferably 1G provided with a reinfcrc~ing rib which can be also attained by forming a irregularity pattern on the shoulder portion.
In case of filling a content in tree container body, the shoulder portion .is turned over and subsided .Ln the barrel portion, tr~r> container body is p7_aced standing up 15 reversely so that the opening at: the :Lower end of the container body be positioned upwardly, and then a content is filled in the containez- body through the upwardly-positioned opening at the lower. end.
After a predetermined amount of the content i:~
20 filled in the container body, the opening at the lower end thereof is sealed by molten--adhering the seal film to the flange of the container body. Thus, the content is sea7_ed and contained in the ref:i:iling container.
Upon transport=ing, storing,, or displaying the 25 refilling container in the state of the shoulder portion being subsided inside the barrel port~iora as above-mentioned, the total height of thf~ refilling container is restrained at a low level so that a space for containing and storing t:he container can be reduced. Particularly when the height of 30 the nozzle cylinder is smaller than that of the shoulder portion, it is more advantageous since the nozzle cylinder does not project form the edge of the upper end of the barrel portion and thus the refilling containers can be stacked one another.
A projected piece projecting downwardly relat_Lve to the sealing film is preferably formed c:ircumferential.ly of the flange. In this case, _i_t i.s preferred that the downwardly-projecting size of the projected piece is set to a larger value than a deflection value of the seal film deflected downwardly when a contc~ntv was filled in the container body.
This allows for the bottom thereof to rise so as not to directly contact the seal film with :~ornething else such as a display rack, whereby t::~le seal film can be prevented from damaging. Further, where the refilling container is dropped by mistake, the projected piece acts as a buffer. material.
The shape of the projected piece may be either in the form of arc of which a section projects downwardly or in the form of bellows exuending downwar_dly. I:n short, the projected piece may be of any shape, provided that it. i:~
capable of raising the bottom of the seal film. When the content of the refilling container i;~ r_efill.ed in anothE:r container such as an empty bottle container, the barrel portion of the container body i.s pre;~sed, for example by gripping it with hands, t:o thereby increase an inner pressure within the container body. Thus, the shoulder portion, which has been turned over and subsided in the barrel portion, is turneed over again and returned to a posture projected upwardly with respect to the barrel portion. Then, the up,pc,r end portion of the Nozzle cylinder projecting from the centrer of the shoulder portion is cut with scissors and the l.~.ke to open an injection port.
Thereafter, t:he content. of the refilling container is refilled in the other COI'ltalner either by plaguing the opened nozzle cylinder near the mouth of the other container oz- by inserting the former into the latter. During the refil7_ing work, the nozzle cylinder may be maintained i:n a constant cylindrical shape, so that the content may be constantly and successfully injected t:h:rough the nozz=Le cyl_inder.
In addition, when the thic)cness of the platen of the container body is larger than th<~t of the nozzle cylinder, the nozzle cy1_Lnder can be easily cut since the platen is tensioned. Farther, t:he noz:~le cylinder to be cut 1C can be distinguished from the platen because the platen is thicker, enabling it t~~ form a cut opens.ng of_ a constant, shape at a predetermined position.
After the ceni~ent is complf=tely injected, the refilling container may be disposed :in a compact shape by 1~ crushing it flat. The crushing treatment of the container body is easy since the same body is thinly f=ormed. The crushing is also easy when the seal Film is torn prior t=o crushing.
The present invention also provides a method 20 suitable for manufacturing a thin container body made of a resin, the container body comprising a cylindrical barrel portion; an outwardly overhanging-flange formed integrally with and circumferentia:lly of the edge of an opening positioning at the lower end of the barrel portion; a 2~~ shoulder portion continuously connected to the upper end of the barrel portion; anal a short-cylindrical nozzle cylinder having a top, continue,~zsly connected to and stood up from the center portion of tzze shoulder portion.
In a first nnanufacturing method, a molding mold is 3C) used having a cavity which has they same shape as the container body and is opened at a corresponding portion to a _g_ bottom of the container body; and a plug capable of penetrating into the c:av:ity of t:he molding mold. According to the first manufacturing method, t:he container body i;~
manufactured through the steps of:
(a) covering the opening o.f the cavity of the molding mold with a synthetic resin ;sheet;
(b) pinching anti pressing a predetermined portion of the synthetic :resin sheet, the prE_=determined portion being positioned to be at: least circumferential edge portion of the flange of the container body, around t:he opening of the cavity and between t:he molding mold and a pressing ring;
(c) pressing the synthetic resin sheet inward7_y of the cavity by means of t:lze plug under_ a heating condition while pressing the predetermined port: ion of the synthetic resin sheet to be the flange of the container body by mE:ans of the pressing ring; aru:~
(d) generating a pressure difference between inside and outside of tine synthetic resin sheet during t:he step of pressing by means of= the plug to thereby adhere the synthetic resin sheet to an inner surface of the cavity.
In the first manufacturing method, the circumferenti.al edge pc~rtiorr of the flange of the resulting container body can be formed of a non-oriented resin since a tension does :not act on the predetermined portion to be at least circumferential edge portion of t;he flange. The circumferential portion of the flange, the portion being formed of the non--oriented resin, is not broken :radially even i.f an impact caused by such as dropping :is impressE:d thereon.

In the first manufacturing method, it is preferred that the inner diameter of the sheet-pressing ring is substantially-equal to or less than the diameter of the opening of the cavity .bec:ause this makes it possible fox- not only the circvamferential edge portion but also the entire flange to non-orient.
In ,~ second manufacturing method, a molding mold is used having a cavity wfva_c:h has the same shape as the container body and is opened at ,:~. c:orr.espondinc~ portion to the bottom of the container body, an inside of the opening of the cavity being provided with a lx-<:~ove going round the opening; and a plug capable of penetrat:ing into the cavity of the molding mold. According to the second manufacturing method, the container body is manufar_~.tured through the steps of:
(a) covering the opening of the cavity of the molding mold with a synt:lietic resin sheet;
(b) pinching and pressing t:he synthetic resin sheet circumferential of the opening cf the cavity, between the molding mold a.nd a sheet:--pressing ring;
(c) pressing t:he synthetic resin sheet inwardly of the cavity by means of t:he plug under a heating condition while pressing the synthetic: re sin sheet by means of the pressing ring; and (d) generating a pressure difference between inside and outside o:E the synr_het:ic: resin sheet during the step of pressing by means of the plug, t~o thereby adhere the synthetic resin sheet to an inner_~ ~~urface of the cavity .
In the secon~::i manufacturing method, the circumferenti<~.l portio;:~ of the edge of the opening positioned at the lower end of that~ barrel portion is stretched in both axial and radial directions of the barrel portion, so that the resin forming the circurnferential portion may be oriented in longitudinal and horizontal directions. Thus, the strength circumferential of the end of the opening at the lower end of the barrel portion can be increased so that a break may hardly be generated.
It is also possible to combine the first manufacturing method wi.t~h the second manufacturing method. In the first and second manufacturing methods, for generating the pressure difference, arty suitable me<~ns may be employed, including means for providing a posi.i~ive pressure in the outside of the synthetic resin sheet such as supplying a pressurized gas thereiry means for providing a negative pressure in the inside of the synthetic resin sheet such as sucking the interior of the cavity, <~nd means for apply~~ng both the negative and positive pressures.
The shape of the plug used in the first and second manufacturing methods may be analogous to that of the cavity.
Brief Description of the Drawings Fig. 1 is an elevational entire view showing breaking a part of the refilling container of Embodiment: 1 in which a shoulder portion :is subsided in a barrel portion.
Fig. 2 is an elevational entire view showing t:he container body of Embod:irnent 1 in which a shoulder portion is projected upwardly from <~ barrel porl~.ion.
Fig. 3 is a view showing container. bodies stacked one on anothez~ .
Fig. 4 is an e:Levation view showing the state of breaking the nozzle cylinder of a re:Ei:iling container.

Fig. 5 is a View showing the state of refilling the content of a refilling c:onta:iner in another container.
Fig. 6 is a ~,riew showing tree state of breaking the seal film of .gin empty refilling container.
Fig. 7 is a ~,riew showing the state of an empt~T
refilling container crashed flat.
Fig. 8 .is an c~levational entire view showing t:he refilling -11a-~~:~~~~~~
container of Embodiment 2 in which a shoulder portion .is projected upwardly from a barrel portion.
Fig. 9 is an el.evational entire view showing breaking a part of the refilling container of Embodiment 2 :in which a shoulder portion is subsided in a barrel portion.
Fig. 10 is an elevational entire view showing breaking a part of the refilling container of Embodiment 3 in which a shoulder portion is subsided in a barrel portion.
Fig. 11 is an elevatioraal entire view showing the refilling container of Embodiment 3 in which a shoulder portion is protected upwardly from a barrel portion.
Fig. 12 is an enlarged sectional view showing the lower portion of the refilling container of Embodiment 3.
Fig. 13 is a view showing breaking a part of a modification example of the refilling container of Embodiment 3 in. which a shoulder portion is protected upwardly from a barrel portion.
Fig. 14 is an elevational entire view showing the refilling container of Embodiment 4 in which a shoulder portion is pro;Jected upwardly from a barrel portion.
Fig. 15 is an elevational entire view showing breaking a part of the refilling container of Embodiment 4 in which a shoulder portion is subsided in a barrel portion.
Fig. 16 is an elevation view showing the state of breaking the nozzle cylinder of a refilling container of Embodiment 4.
Fig. 17 is a half sectional view showing positions for measuring the thickness of a container body.
Fig. 18 is an elevat:ional entire view showing breaking a part of the refilling container of Embodiment 5 in which a shoulder portion is pro;Jected upwardly from a barrel portion.
Fig. 19 is an enlarged view showing the end surface circumferent.ial of a reinforcing ring used in a refilling container o.f' Embodiment 5.
Fig. 20 is an enlarged view showing the end surface circurnferential of a reinforcing ring used :in a first modification example of the refilling container of Embodiment 5.
Fig. 21 is an enlarged view showing the end surface circumferential o-f a reinforcing ring used in a second modification example of the refilling container of Embodiment 5.
Fig. 22 is an elevation view showing the upper portion of a third modification example of the refilling container of Embodiment 5 i.n which a shoulder portion :is projected upwardly from a barrel portion.
Fig. 23 is an enlarged view showing the end surface circumferential of a reinforcing ring used in a refilling container of said third modification exmample.
Fig. 24 is an elevation view showing tine upper portion of a fourth modification example of the ref111ing container of Embodiment 5 in which a shoulder portion is projected upwardly from a barrel portion.
Fl. g. 25 is an elevation view showing the refilling container of said fouth modification example.
Figs. 26A and 26B are a sectional view of a reinforcing rib, , respectively.
Fig. 27 is an elevation view showing the upper portion of a fifth modification example of the refilling container of Embodiment 5 in which a shoulder portion is projected upwardly from a barrel portion.
Fig. 28 is a view for explaining a manufactureing method according to the presenC lnvent;l.on.
Fig. 29 is a view for explaining a cornparative-manufactureing method.
Best Mode for Carrying out the Invention Preferable embodiments of the present invention are described hereinafter based on the drawings.
(Embodiment 1~
Refilling container) t~ccordig Lo lrmbodimenc: 1 are explained based on Figs. 1.-7. Ftg. 1. is an elevational entire view showing breaking a part of the refilling container of Embodiment 1. The refilling container is provided with a thin container body 1 of which lower end is opened, and a seal film 7 for sealing up the opening positioned at the lower end of the container body 1. Fig. 2 is an elevational entire view showing the conta.lner bcidy 1 prior to refilling a content.
The container body 1 is one prepared by thermoforming a thin synthetic resin film, and comprises a barrel portion -2, a shoulder portion 3, a noLZle cylinder 4, a flange 5 and a platen 21.
The barrel portion 2 is scraped in tile form of a tapered cylinder having a circular cross-section, of which taper reduces upwardly and gradually in diameter, and is opened at the lower end thereof. At the lower end portion of the barrel portion 2, there is formed a step portion 6 of which diarneter increases outwardly. The outer diameter W, of the step portion 6 is designed so as to be larger than the inner diameter Wz of the ope:rring at the lower end of the barrel portion 2. The flange 5 is formed integrally with and circumferentially of the edge of the openinb~ positioned at the lower end of the barrel portion and overhangs horizontally and outwardly.
Theshoulder portian 3 is shaped in the form of a linearly-inclined tapered cylinder having a circular cross-section and is continue>usly connected to the upper end oI' tl~e barrel portion 2. The shoulder portion 3 is designed so that it can be subsided intc the barrel pa:rtion 2 by turning over downwardly and so that the thus subsided shoulder portion 3 10- can pro,~ecC again upwardly from the barrel portion 2. A
suitable inclined angle B of the shoulder portion 3 (relative to the upper end of the barrel portion) to ensure the turn-over action is 45° or Less, and preferably 30° or less.
The nozzle cylinder 4 is shaped in the form of a slightly-tapered short cylinder having a circular cross-section, and is continuously connected to the center portion of the shoulder portion 3 in the posture of standing up. The top of the nozzle cylinder 4 is closed by the platen-21. 1'he height site a of the nozzle cylinder 4 is set to a value smaller than 20 the height size b of the shoulder portion 3.
A container body 1 for cotaining 500 ml (total height: 160 mm, height size b of the shoulder portion 3: 1.2 mm, height size a of the nozzle cylinder 4; lOmm) as shown in F'ig. 2 was manufactured by thermoforming a single-layered polypropylene sheet having a thickness of 1.50 mm. T'he even thickness of the shoulder portion 3 of tine resulting container body was about 0.37 mm and the even thickness of the continuously connected portion between the barrel portion 2 and the shoulder portion 3, or t.i~e upper end portion of the barrel portion 2, was about 0.16 mrn.

Since the thickness of the upperr end portion o1' the barrel portion 2 is sufficiently small as set forth above, the elastic turn-over and deformation of the shoulder portion 3 can be easily and stably accomplished. Since the thickness of the shoulder portion 3 is also relatively large, the turn-over and deformation state of the shoulder portion 3 itself can be stably self-holded. Since the container body 1 is manufactured by thermo--mc>l.ding, it i=~ obtained at high production efficiency and at low cost. In addition, the ZC~ container body 1 may ba thermoformed from the beginning in the state of the shoulder portion 3 having been subsided in the barrel portion 2.
Since the barrel portion 2 oP the contain<~r body 1 is shaped in the form of a tapered cya.inder and is provided with the step portion 6 of which outer diameter W; is larger than the inner diameter Wz oP the opening at the lower end of the barrel portion 2, the container bociic:s 1 are not fixed into one another so strongly as not to be pulled out when thE:y were stacked prior to filling a content. <~s shown in fig. 3.
20 The seal film 7 is rnalten-adhered to all. around the bottom surface of the flange 5 of the container body 1 while sealing the opening at the lower end of the container body 1.
The seal film 7 is required to have a high compatibility with the container body 1. Since the seal film 7 forms a "seat" when the refilling container is Maid cn a floor or the like while forrrui.;ig a "stacked portion" when the refilling containers a.re stacked one on another, as set forth hereinafter, the: sea,A
film 7~ is also requier°ed to have a sufficient mechanical strength to endure the: weight of the refilling container.
We, the present inventors, carried oixt an impact strength test by dropping the 50C) ml container body 1 from a height of about 1 m, the container- body being filled with a liquid detergent, as a content, and using a layered film, as a seal film 7 assembled with the container body 1. 'rhe layered film was prepared :by laminar~ixig a non-stretched polypropylene layer having a thickness of 0.06-0.08 mm, a nylon layer having a thickness of 0.015-O.C25 mm and a polyethylene terephthalate layer having a thickne~~;~ of 0.01.2 mm :iIl this order from the side of the container body 1. After repeating the test five times, this seal film ~' exhibited a :sufficient strength not to be broken and a stable endurance even when several number (e. g. 3-4) of the refill.-ing containers are stacked.
In this conrrer_tion, molding materials for use in the container body 1 and the seal film 7 may include various sheets and films each Izaving required physical properties, without limiting the synthetic resin film to a single layer or the multi-layered film. Further, :it is desired to decorate the surface of the cont:a:i~er bady 1 by properly printing thereon.
The thus constituted refilling containers are used in the following manner: in case of filling a content :in the refilling container, ar in case of transporting, storing or displaying the refilling cantain.er after filled with a content, these refilling containers are used after the shoulder portion 3 is subsided inside the barrel portion 2.
In case of refilling ~. cant:ent filled in the refilling container into another container, the refilling container is used after the shouldEr portion 3 is turned over and projected from the barrel portion 2. Details thereof are as follows:
(1) Work for filling a content in the refilling container:
_17_.

In ~~ ase of f vi ~. l in.g a l iquid content such as detergents and shampoos in the conta;~ner body, the shoulder portion 3 thereof is tux-ned. over and subsided in the barrel portion 2, the containex:~ body 1 stands up reversely so that the opening at. the lower end of the r_ontainer body 1 can be positioned upwardly, a:nd then the content is filled in t:he container body 1 through the upwardly-positioned opening at the lower end.
After a predetermined amount of content was filled in the container body :1., the opening at the lower end thereof is sealed by molten-adhering the seal film 7 to the flange 5 of the container body 1.. Thus, the :~eaiing and containing of the content into the refilling container are accomplished.
(2) Transportation, storage and disp:Lay of the refilling container:
In case of transporting, storing or displaying the refilling container fi.l_led with a content, the refilling container is handled in the state of the shoulder portion 3 of the container body 1 being subsided :in the barrel portion 2 as 2C set forth above.
Since the height a of the nozzle cylinder 4 of the container body is set t:o a value sma:Ller than the heights b of the shoulder portion 3 as stated above, the edge of the upper end of the nozzle cylinder 4 is designed always to be 2 G~ positioned below the edge of the upp~°_r end of the bane=L
portion 2 in the state~c~f the shoulder portion 3 being subsided in the barrel portion 2, and thus the edge of i~he upper end of the nozzle cylinder 4 does not project from the edge of the upper end o~ the barrel :portion 2. Accordingly, 30 the refilling containers filled with a content can be stacked one on another. Thus, it is very advantageous since a number _1g._ of the refilling conta:Lners can be laid in a :Limited space and this allows the containers to be conveniently transported, stored and displayed.
Furthermore, since the total height of the refilling container in the state o.f: the shoulder portion 3 being subsided in the barrel portion ? i_s as low as (a + b) size relative to the state of 'the shoulder portion 3 being projected from the barrel. portion 2, a space can be utilized efficiently and the refilling container can be also handled efficiently.
(3) Work for refilling a r_ontent:
Refilling the content of the refilling container into an empty bottle container 1.00 i.s carried out as fo7_lows.
The refilling container in the state as shown in Fig. 1 is pressed laterally inwardly, for example, by gripping it with one hand to act a pressure R on the barrel portion 2, thereby increasing an inner pressure within the refilling container. Thus, the subsided shoulder portion 3 is turned over and returned to a posture projecting upwardly out of the barrel portion 2 to tre:reby convert into a shape like in Fig. 2.
Then, the u~.~pe:r end pardon of the nozzle cylinder 4 projecting upwardly from the shoulder portion 3 is cut with scissors and the like, as shown in Fig. 4, to open the ,.zpper end of the nozzle cyli..nder 4. Thereafter, refilling of the content is carried out: while inclining the refilling container by placing the upper End of the opened nozzle cylinder 4 near the mouth 101. of the a:~mpty bottle container 100, as shown in Fig. 5.
At this timE:>, the refilling container 1 exhibits a 3c) relatively high self-holdability since it is a thin container < 6 k f' r.~
but has basical.l.y a cylindricaal shape inspite of a thin container. Accordingly, there is no -fear that, during the refilling work, the refilling container is deformed to make the refi.lli.ng work difficult. Moreover, said opening of the nozzle cylinder 4 is always rnaintained in a constant shape and the content is also injected in a constant shape through the opening, so that the refilling work 9.s done easily and the content is hardly to be spilt.
Particularly when the outer diameter of the nozzle cylinder 4 :is set to be less than the inner diameter of the mouth 101 of the bottle container 100, the refilling work of the content can be carried out in the state that the nozzle cylinder 4 is fitted into the mouth 101 of the bottle container 100, thus enabling to accomplish more certainly the refilling treatment without spilling the content.
(4) Disposal of the refilling container:
When refilling was completed and the refilling container became empty, the entire refilling container is crushed flat and then disposed as shown in Fig. 7. In this case, :when the seal film has been previously torn, the container body 1 can be easily crushed. When the refilling container is disposed after crushed as such, the container to be disposed become compact.
[Embodiment 2]
A refilling container accordig to Embodiment 2 is explained based on Figs. 8 and 9. The basic constitution of the refillixig container of Embodiment 2 is the same as that of said Embodiment 1. Differences of Embodiment 2 from Embodiment 1 are explained hereinafter.
-2.0-~;~~r~'~~
The upper end portion of the barrel portion 2 of the container body 1. in this refilling container curves slightly inside as It approaches to the upper edge, and a shoulder portion 3 is cont:Lnuously connected to the curved upper edge of the barrel portion 2. A refraction point Po is formed between said upper edge of the barrel portion 2 and the shoulder portion 3. The shoulder portion 3 is shaped in the form of an arcuatelyinclined, tapered cylinder having a circular cross-section.
Also in this Embodiment 2, the shoulder portion 3 is designed to be capable of turning over and subsiding in the barrel portion 2 as shown in Fig. 9, while the subsided shoulder portion 3 is designed to be capable of turning over again and pro,]ecting upwardly from the barrel portion 2 as shown in Fig. 8. Since the shoulder portion 3 is shaped in the form of an actuate taper, the elasticity of the shoulder portion 3 is strengthened and thus the turn-over action thereof is facilitated.
Further, since the upper portion of the barrel portion 2 is curved inside so as to position the refraction point Po inside, a corner portion between the shoulder portion. 3 and the barrel portion 2 of a first container body 1 positioned inside does not be caught on the inner surface of a second container body 1 positioned outside.
[Embodiment 3]
A refilling container accordig to Embodiment 3 is explained based on Figs. 10-13. 'i'he basic constitution of the refilling container of Embodiment 3 is the same as that of said Embodiment 1. Differences of Embodiment 3 from Embodiment 1 are explained hereinafter.
Fig. 10 shows the state of the shoulder portion 3 of this refilling container being subsided in the barrel portion 2, and Fig. 11 shows the state of the shoulder portion 3 being projected upwardly from the barrel portion 2.
A piece 10 projecting dewnwardly and having a cross-section of a semi-circv:Lar arch is formed around the flange 5 of the container body 1 of the refil:Ling container and is designed to be capable of raising them bottom of a seal film 7.
The height c of the bottom-raising piece 10 is set to a value larger than a deflection value d of i~he seal. film deflected downwardly when a content was filled in the container body 1 so that a clearance a i_s for_med between a fl.ocr surface T and the seal film 7 when the refilling container was placed on the floor surface T, as shi~wn in Fig. 12.
Since the bottom of the seal film 7 is raised by the projected piece 10, the seal film 7 is not damaged by contacting with the floor surface T. Further, even when the refilling container is dropped by mistake, the projected piece acts as a buffer material to thereby improve the impact resistance of the container body 1.
The sectional shape of the projected piece 10 does not have to be limited to semi-circular- arch but various shapes may be employed. Fig. 13 shows an example of the sectional shape being in the form of bellows. In addition, a supplemental shoulder portion 11 is provided between the barrel portion. 2 and tire shoulder portion .3 irl the container body shown in Fig. 13. 'This supplemental shoulder portion 11 is detailed in Embodiment 4.

(Embodiment 4]
A refilling containc:~r accordig to Embodiment 4 is explained based on rigs. 14-17. The basic constitution of the refilling container of Embodiment; 4 is the same as that of Embodiment 1. Differeruces Embodiment 4 from C;mbodiment 1 are explained hereinafter.
Fig. 14 shows the state where the shoulder portion 3 of the refilling container projects upwardly from thc, barrel portion 2, and Fig. 15 shows tine state of the shoulder portion 3 bein6r subsided in the barrel portion 2.
In the conlalner body 1 tit tirl s ref l l lln6r con Gainer , a supplemental shoulder portion 11, of which diameter reduces upwardly, is formed between the barrel portion 2 and the shoulder portion 3. A boundary between the supplemental shoulder portion 11 and the barrel portion 2 corresponds to a first refraction point P,, and a boundary between the supplemental shoulder portion 11 and the shoulder portion 3 corresponds to a second refraction point Pz.
lay forming the supplc:mc:ntal shoulder portion 11 to provide two refraction points Px and P2 of wtrich refrtrction point P2 is arranbred inside, the turn-over of the shoulder portion 3 is effected at these two refraction points P~ and P~ when t:he shoulder portion 3 '1s subsided in the barrel portion 2, whereby the turn-over action can be effected very easily.
Furtherurore, by arr°anging the refraction point P2 inside, the outward overhang of a boundary portion between the shoulder portion 3 and the barrel portion 2 when the shoulder portion 3 is subsided in can be decreased. Accordingly, when Lhe container bodies 1 prior to fillin6~ a content are stacked as shown in Fig. 3, there is rya fear- that floe boundary portion between the stnauldc:r portion 3 and the barrel portion 2 of a first container° body 1 positioned inside is caught on the inner surface of t:he barrel portion 2 of a second container body 1 posit:ianed outside and thus it becomes difficult to pull. out ttrese coma ner bodies one another.
In this refilling c:ontalner, the flange ;i is a portion to be the base of the container body 1 as well as a most important portion to t:~e a seal portion ai'ter filled with a content. For this pur°pose, the thickness t1 of ttie flange 5 is prefered to be 0.4nam-l.Omm.
A size relatlorr amc:~nt; tare thlckn<:ss ti of the flange 5, the thickness t2 of the st:;ep portian 6, the thickness t3 of the lower portion of the t>arrei portion 2, the thickness t4 of the upper portion of the trarrel portion 2, the thikness t'5 of the supplemental shoulder portion 11, the thickness t6 of tlhe shoulder portion 3, tkre th:lckness t7 of the nozzle cylinder 4 and the thickness t8 c:>f the platen 21 is pref'ered to be tl>t6>t2>t3z t4z t5> i:7~.; t8.
The shoulder portic:~n 3 is desired to be thin in order to easily turn over and :subside in. In case the shoulder ;portion 3 is~too thin, however, either the shout.der portion 3 sometimes deforms partially due to such as thermal expansion of a content during si;oring the content after the shoulder portion 3 is turned cyver and subsided in and then the content is filled in the conirainer body 1. and c:hereafter the opening at the lower end of tare container body 1. is sealed with the seal film 7~, or the stzoulder partton 3 sometimes projects on and returns as it was. due to the weight of the content itself against the will of a user, so that the thickness thereof can ~.~F~f.)~~ i not be smaller than a thickness to be required. I~'or this reason, it :i.s desired that the thickness t6 of the shoulder portion 3 is large next to the thickness t1 of the flange 5.
The step portion 6 is a portion having a reinforcing role for preventing deformation. For this reason, the thickness t2 of the step portion 6 is smaller than the thickness t1 of the flange 5 but is larger than the thicknesses t3, t4 of the barrel portion 2. The thicknesses t3, t4 of the barrel portion 2 and the thickness t5 of the supplemental shoulder port:Lon 11 are required to be a thickness so as not to cause buckling when the shoulder portion 0 was subsided in the barrel portion 2.
In case the thickness t7 of the nozzle cylinder 4 is smaller than the thickness t8 of the platen 21, the platen 21 is tensioned so that the nozzle cylinder 4 is easily cut when cut with scissors and the like, as shown in Fig. 16. Further, the nozzle cylinder 4 to be cut can be easily distinguished from the plat en 21, enabling to form a cut opening of a constant shape at a predetermined position.
A container body 1 for cotaining 500 ml (total height: 160 mm, height size b of the shoulder portion 3: 12 mm, height size a of the nozzle cylinder 4: lOmm) as shown in Fig. 14 was manufactured by thermoforming a single-layered polypropylene sheet having a thickness of 1.50 mm. The thicknesses of A-H
positions shown in Fig. 17 were measured with the results being shown in the following Table 1. A container body 1 manufactured by thermo-form molding a single-layered polyethylene terephthalate sheet having a thickness of 1.50 mm had also substantially the same thicknesses as above.
In th:Ls container body 1, since the thickness of from the tnn1;~
J i~ iJ
upper end port:i.on of the barrel portion 2 to the shoulder portion 2 is sufficiently small., the elastic turn-over and deformation of the shoulder portion 3 can be easily and stably accomplished.

r,'~ a ~i'l L. ~, r~
~~ ~ i.d t~ ey ~
< Table 1>
Thickness (mm) ti=1.0o B t2=0.25 C t3=0.22 D t~=0.15 E t5=0.15 F t6=0.36 G t7=0.11 I-I t8=0.15 [Embodiment 5~
A refilling container accordig to Embodiment 5 is explained based on Figs. 18-27. The bas:Lc constitution of the refilling container of Embodiment 5 is the same as that of said Embodiment 4. Differences of Embodiment 5 from Embodiment 4 are explained hereinafter.
In the container body 1 of this refilling container, a reinforcing ring 12 is formed between a supplemental shoulder l.1 ~~';~ .~
hJ 7.7 Gl j 'd portion 11 and the shoulder portion 3 as shown in figs. 18 and 1.9. fhe reinforcing ring 1.2 is comprised of a flat surface (a virtual flat surface S including the entire circum:fer.ential edge of the shoulder portion 3) circularly surrounding the shoulder portion 3. In case of this container body l, a boundary between the supplemental shoulder portion 11 and the barrel portion 2 corresponds to a first refraction point P~, a boundary between the supplemental shoulder portion 11 and the reinforcing ring 12 corresponds to a second refraction point P2, and a boundary between the reinforcing ring 12 and the shoulder portion 3 corresponds to a third refraction point P3.
The reinforcing ring 12 is positioned an a symmetric line based on the shoulder portion 3 as subsided in the barrel portion 2, so that the turn-over action of the shoulder portion 2 is facilitated. In addition, the reinforcing ring 12 reinforces the outer circumferential edge of the shoulder portion 3, so that the shoulder portion 3 can not be distorted when turned over and subsided in.
A container body 1 for containing 500 ml (total height: 160 mm, height size b of the shoulder portion.3: 12 mm, height size a of the nozzle cylinder 4: l0mm) as shown in Fig. 18 was manufactured by thermo-form molding a single-layered polypropylene sheet having a thickness of 1.50 mm. The even thickness of the shoulder portion 3 of the resulting container body was about 0.37 mm, and the even thicknesses of the supplemental shoulder portion 11 and the reinforcing ring 12 each were about 0.16 mm.
Figs. 20-23 each show another shape of the reinforcing ring 12, in which cases the shoulder portion 3 is also easily turned over and deforuted due to the existence of the c shy~',( ~)~~a FN t l i~ ~ f~
reinforcing ring 12 so that the shoulder portion 3 can not be distorted when turned over and subsided in.
Fig. 20 shows a convex-curved surface in which a reinforcing ring 12 projects upwardly. In this case, the supplemental shoulder portion 11 connected to the reinforcing ring 12 has also a convex-curved surface of which diameter reduces upwardly. A portion connected continuously to the shoulder portion 3 of this reinforcing ring 12 forms a sloped surface sloping downwax~dly toward the center of the container body 1.
Fig. 21 i.s comprised of a convex surface 14 in which a reinforcing ring 12 projects upwardly and a concave-curved surface 15 in which said reinforcing ring 12 projects downwardly. In this case, the continuously-connected portion of the convex-curved surface 14 to the concave-curved portion 15 forms a sloped surface sloping downwardly toward the center of the barrel portion 2.
Fig. 22 is comprised of. three concave-curved surfaces 17a, 17b, 17c in which the shoulder portion 3 is shaped in the form of a ring. The concave-curved surfaces 17a, 17b, 17c function as a reinforcing rib, whereby the shoulder portion 3 can not be distorted when turned over and subsided in. In this case, the continuously-connected surface of the concave-curved surface 17a to the supplemental shoulder portion 11 forms a reinforcing ring 12. As shown in an enlarged view of Fig. 23, this reinforcing rib 12 is a substantially flat surface (a virtual flat surface S including the entire circumferential edge of the concave-curved surface 17a).
Fig. 24 is a partial elevational view showing an embodiment in which reinforcing ribs 18, 18b are provided in a shoulder sv , ~;j (7 er d :.J~' a! f,!
portion 3, and Fig. 25 is a plane view thereof. The reinforcing rib 18a is provided in the -form of a ring at the center portion o-f the shoulder portion 3 and the sectional shape thereof is a substantially semi-circular arch as shown in Fig. 26(A). The reinforcing rib 18b is arranged radially outside the reinforcing rib 18a and the sectional shape thereof is as shown in Fig. 26(B).
By forming these reinfarcing ribs 18a, 18b, the shoulder portion 3 can not be distorted when turned over and subsided in. In this figure, the .reinforcing ring 12 is formed on a plane surface as in Fig. 18, however, it can be shaped also like a shape as in Fig. 20 or 21.
Further, as shown in Fig. 27, the container body 1 of which shoulder portion 3 forms a curved surface can be, of course, provided also with a reinforcing ring 12. In this figure, the centers t~ of the curvature of the curved surface constituting the shoulder portion 3 are positioned at the opposite sides plncliing the central axis of the barrel portion 2, however, the center of the curvature of the curved surface constituting the shoulder portion 3 m~.y be positioned on the central axis of the barrel. portion 2.
[Embodiment 6]
A method for manufacturing the container body 1 of Embodiment l shown in Fig. 1 is explained in reference to Fig.
28. A molding mold 31 and a plug 32 are used in this method.
A cavity 30 having the same shape as the container body 1 to be manufactured Is formed in the molding mold 31 and is opened at a corresponding portion to the bottom of the container body 7.. Inside tine opening of the molding mold 31, a groove 51 P
~,.' J. hJ C ~ i. ~ S.A
going round the opening is previously formed. The plug 32 is shaped as shown :in this -f':igure so that it can penetrate into the cavity of the molding mold 30.
'rhe manufacturing method accordin g to this embodiment comprises the following four steps of;
(a) covering the opening of said cavity of the molding mold 31 with a synthetic resin sheet 41;
(b) pinching and pressing a predetermined portion of the synthetic resin sheet 41 by means of a sheet-pressing ring 33 having a inner diameter substantially-enual to or less than the diameter of the opening of the cavity, said predetermined portion being positioned to be the flange 5 of the container body 1, around the opening of said cavity and between said pressing ring and said molding mold;
(c) pressing said synthetic resin sheet 41 inwardly of said cavity 30 by means of said plug 32 under a heating condition while pressing said predetermined portion to be the flange 5 of the container body 1 by means o:~ said pressing ring 33; and (d) generating a negative pressure inside the cavity 30 at said synthetic resin sheet 41, as a boundary, in the state of the same sheet being pressed by means of sa-id plug 32. to thereby adhere the synthetic resin sheet 41 to the inner surface of said cavity 30.
When manufacturing a container body 1 according to this method, a tension does nat act on the predetermined portion to be the flange 5 during thermoforming, so 'that the same portion is not stretched and oriented. Thrts, a container body 1 of which flange 5 is formed of a non-oriented resin can be manufactured. This does not allow to break radially the flange 5 even if an impact caused by such as dropping is Impressed thereon.
While, the circumferential portion of the edge of the opening positioned at the lower end of the barrel. portian 2 of the container body 1 is stretched in both axial and radial directions of the barrel portion 2, so that the resin forming said circumferential portion may be oriented in longitudinal and horizontal directions. Thus, the strength circumferential of the end of the opening at the lower end of the barrel portion, 2 can be increased to cause hard to generate a break even if an impact caused by such as dropping is impressed thereon.
According to this method, a container body 1 for containing 500 ml (total height: 160 mm, height size b of the shoulder portion 3: 12 mm, height size a of the nozzle cylinder 4:
l0mm) as shown In Fig. 2 was manufactured by thermoforming a single-layered polypropylene sheet having a thickness of 1.50 mm. The even thickness of the shoulder portion 3 of the resulting container body was about 0.37 mm and the even th:lekness of the continuously-connected portion of the barrel portion 2 to the shoulder portion 3, or the upper end portion of the barrel portion 2, was about 0.16 mm.
After said 500m1 container body 1 was filled with a liquid detergent, as a content, and the seal film 7 was molten-adhered to the flange 5, a dropping test from a height of about 1 m was carried out. As a result, no damages such as radial breakage of the flange 5 or circumferential breakage of the opening at the lower end of the barrel portion 2 were generated. In this case, there was used a layered film, as said seal film 7, prepared by laminating a non-stretched polypropylene layer having a thickness of 0.06-0.08 mm, a ., sj .~ riy ;. x:~ '~l ,°' l,, _~. w :> a. i r~
nylon layer having a thickness of 0.015-0.025 mm and a polyethylene terephthalate layer having a thickness of 0.012 mm in this order from the side of the container body 1.
< Comparative Embodiment>
Fig. 29 shows a manufacturing method according to Comparative Example. In Comparative Embodiment, there were used the same molding mold 31 and the same plug 32 as those mentioned above, respectively, and a sheet-pressing ring 34 of which inner diameter is larger than the outer diameter of the flange.5 of a container body 1 to be manufactured.
Thermoforming was effected under the same conditions as mentioned above, except that the synthetic resin sheet 41 positioned outside a predetermined portion to be the Flange 5 was pinched and pressed around the opening of the cavity 30 by means of said sheet-pressing ring 34 and said molding mold 31.
In this method according to Comparative Embodiment, a corresponding portion to the flange 5 was also extended to be stretched and oriented in radial direction. The thus obtained container body 1 is broken at the flange 5 in the orientation direction of the resin, or radially, due to an impact such as dropp~.ng.
Industrial. Ap~ltcabili~
A refillizig container according to the present invention is superior in self-shape holdability; it can refill a content easily; it is advantageous in transportation, storage, display and the like; and it can be disposed easily. Accordingly, it is useful as a refilling container for containing various liquid or creamy contents such as liquid shampoos, liquid yj'~~'9r)sp _~ in v,? e.) i rl.~
rinses and other liquid cosmetics, and liquid foodse

Claims

CLAIMS:

1. A refilling container, comprising:
(a) a container body which comprises:
(1) a cylindrical barrel portion having an upper end and a lower end at which an opening is formed;
(2) an outwardly overhanging-flange formed integrally with and circumferentially on an edge of the opening at the lower end of the barrel portion;
(3) a tapered cylindrical shoulder portion continuously connected to the upper end of the barrel portion;
(4) a cylindrical nozzle portion continuously connected to and standing up from a center portion of the shoulder portion, the nozzle portion having a height smaller than the shoulder portion; and (5) a platen closing a top of the nozzle portion;
and (b) a seal film molten-adhered to a lower surface of the flange of the container body for sealing up the opening at the lower end of the container body, wherein the container body is a thermo formed product of such a thin synthetic resin sheet that (I) the shoulder portion is capable of (i) subsiding into the barrel portion by turning over downwardly, and (ii) turning over back to a posture in which the shoulder portion and the nozzle portion project upwardly out of the barrel portion, when the barrel portion is pressed laterally and inwardly to increase an inner pressure of the container body while the shoulder portion is subsided and (II) nevertheless the refilling container holds its self-shape.

2. The refilling container according to claim 1, wherein the shoulder portion (3) is tapered linearly.

3. The refilling container according to claim 1, wherein the shoulder portion (3) is tapered arcuately.

4. The refilling container according to any one of claims 1 to 3, wherein the platen has a thickness smaller than that of the nozzle portion.

5. The refilling container according to any one of claims 1 to 4, wherein the barrel portion has a tapered cylindrical shape so that a diameter of the taper decreases upwardly, and wherein a step portion outwardly projecting is formed at the lower end of the barrel portion, the step portion having an outer diameter larder than an inner diameter of the opening at the lower end of the barrel portion.

6. The refilling container according to any one of claims 1 to 5, which further comprises, between the barrel portion and the shoulder portion, a tapered supplemental shoulder portion whose taper decreases upwardly in diameter.

7. The refilling container according to claim 6, wherein the barrel portion has a thickness t4, the supplemental shoulder portion has a thickness t5, the shoulder portion has a thickness t6 and the nozzle portion has a thickness t7, that satisfy the following relationship:

t6 > t4 >= t5 > t7.

8. The refilling container according to claim 7, wherein the flange has a thickness t1, the step portion has a thickness t2, the barrel portion in its lower portion has a thickness t3, the barrel portion in its upper portion has a thickness t4, the supplementary shoulder portion has a thickness t5, the shoulder portion has a thickness t6 and the nozzle portion has a thickness t7, that satisfy the following relationship:

t1 > t6 > t2 > t3 >= t4 >= t5 > t7.

9. The refilling container according to claim 8, wherein the thickness of the flange is in the range of 0.4 mm-1.0 mm.

10. The refilling container according to any one of claims 1 to 5, which further comprises a reinforcing ring circularly surrounding the shoulder portion between the barrel portion and the shoulder portion.

11. The refilling container according to any one of claims 6 to 9, which further comprises a reinforcing ring between the supplemental shoulder portion and the shoulder portion.

12. The refilling container according to claim 10 or 11, wherein the reinforcing ring has a substantially flat surface including an entire outer circumferential edge of the shoulder portion.

13. The refilling container according to claim 10 or 11, wherein the reinforcing ring has a sloped surface sloping downwardly toward a center of the shoulder portion.

14. The refilling container according to claim 10 or 11, wherein the reinforcing ring has a convex-curved surface upwardly projecting.

15. The refilling container according to any one of claims 1 to 14, which further comprises a reinforcing rib formed on the shoulder portion.

16. The refilling container according to any one of claims 1 to 15, which further comprises a piece projecting downwardly around the flange below the seal film so that there is a clearance between a floor surface and the seal film when the container body is filled with a content and the seal film is deflected downwardly.

17. The refilling container according to any one of claims 1 to 16, wherein a portion of the flange is formed of a non-oriented resin.

18. The refilling container according to any one of claims 1 to 17, wherein the shoulder portion is inclined at an angle of 45° or less relative to the upper end of the barrel portion.

19. The refilling container according to any one of claims 1 to 18, wherein the thin synthetic resin sheet is a polypropylene sheet having a thickness of about 1.5mm.

20. A method for manufacturing a thin container body for a refilling container, the thin container body comprising:
(1) a cylindrical barrel portion having an upper end and a lower end at which an opening is formed;

(2) an outwardly overhanging-flange formed integrally with and circumferentially on an edge of the opening at the lower end of the barrel portion;
(3) a shoulder portion continuously connected to the upper end of the barrel portion;
(4) a cylindrical nozzle portion continuously connected to and standing up from a center portion of the shoulder portion; and (5) a platen closing a top of the nozzle portion, wherein the nozzle portion has a height smaller than that of the shoulder portion and wherein the container body is a thermo formed product of such a thin synthetic resin sheet that (I) the shoulder portion is capable of (i) subsiding into the barrel portion by turning over downwardly, and (ii) turning over back to a posture in which the shoulder portion and the nozzle portion project upwardly out of the barrel portion, when the barrel portion is pressed laterally and inwardly to increase an inner pressure of the container body while the shoulder portion is subsided and (II) nevertheless the refilling container holds its self-shape, which method comprises:
(a) providing a molding mold having a cavity which has the same shape as the container body and is opened at a corresponding portion to a bottom of the container body, and a plug capable of penetrating into the cavity of the molding mold, (b) covering an opening of the cavity of the molding mold with the synthetic resin sheet;

(c) pinching, and pressing a predetermined portion of the synthetic resin sheet, the predetermined portion being positioned to be at least circumferential edge portion of the flange of the container body, around the opening of the cavity and between the molding mold and a pressing ring;

(d) pressing the synthetic resin sheet inwardly of the cavity by means of the plug under a heating condition while pressing the predetermined portion of the synthetic resin sheet to be the flange of the container body by means of the pressing ring; and (e) generating a pressure difference between inside and outside the synthetic resin sheet during the step of pressing by means of the plug, to thereby adhere the synthetic resin sheet to an inner surface of the cavity.

21. The method according to claim 20, wherein the sheet-pressing ring has an inner diameter substantially-equal to or less than a diameter of the opening of the cavity.

22. A method for manufacturing a thin container body for a refilling container, the thin container body comprising:
(1) a cylindrical barrel portion having an upper end and a lower end at which an opening is formed;

(2) an outwardly overhanging-flange formed integrally with and circumferentially on an edge of the opening at the lower end of the barrel portion;
(3) a shoulder portion continuously connected to the upper end of the barrel portion;

(4) a cylindrical nozzle portion continuously connected to and standing up from a center portion of the shoulder portion; and (5) a platen closing a top of the nozzle portion, wherein the nozzle portion has a height smaller than that of the shoulder portion and wherein the container body is a thermo formed product of such a thin synthetic resin sheet that (I) the shoulder portion is capable of(i) subsiding into the barrel portion by turning over downwardly, and (ii) turning over back to a posture in which the shoulder portion and the nozzle portion project upwardly out of the barrel portion, when the barrel portion is pressed laterally and inwardly to increase an inner pressure of the container body while the shoulder portion is subsided and (II) nevertheless the refilling container holds its self-shape, which method comprises:
(a) providing a molding mold having a cavity which has the same shape as the container body and is opened at a corresponding portion to a bottom of the container body, inside of an opening of the cavity being provided with a groove going round the opening of the cavity; and a plug capable of penetrating into the cavity of the molding mold, (b) covering the opening of the cavity of the molding mold with the synthetic resin sheet;
(c) pinching and pressing a circumferential portion of the synthetic resin sheet of the opening of the cavity, between the molding mold and a sheet-pressing ring;
(d) pressing the synthetic resin sheet inwardly of the cavity by means of the plug under a heating condition while pressing the synthetic resin sheet by means of the pressing ring; and (e) generating a pressure difference between inside and outside the synthetic resin sheet during the step of pressing by the plug, to thereby adhere the synthetic resin sheet to an inner surface of the cavity.

23. A combination of (a) at least one container body and (b) at least one seal film for forming a refilling container wherein:
the container body (a) comprises:
(1) a cylindrical barrel portion having an upper end and a lower end at which an opening is formed;
(2) an outwardly overhanging-flange formed integrally with and circumferentially on an edge of the opening at the lower end of the barrel portion;
(3) a tapered cylindrical shoulder portion continuously connected to the upper end of the barrel portion;
(4) a cylindrical nozzle portion continuously connected to and standing up from a center portion of the shoulder portion, the nozzle portion having a height smaller than the shoulder portion; and (5) a platen closing a top of the nozzle portion;
the seal files is adapted for being molten-adhered to a lower surface of the flange of the container body for sealing up the opening at the lower end of the container body after filling the container body with a liquid content;
and wherein the container body is a thermo formed product of stick a thin synthetic resin sheet that (I) the shoulder portion is capable of (i) subsiding into the barrel portion by turning over downwardly, and (ii) turning over back to a posture in which the shoulder portion and the nozzle portion project upwardly out of the barrel portion, when the barrel portion is pressed laterally and inwardly to increase an inner pressure of the container body while the shoulder portion is subsided and (II) nevertheless the refilling container holds its self-shape.

24. The combination according to claim 23, wherein the platen has a thickness smaller than that of the nozzle portion.

25. The combination according to claim 23 or 24, wherein a plurality of the container bodies are stacked one on another while the shoulder portion is subsided inside the barrel portion.