CA2455873C - Method for producing bottle-shaped container mainly made of polyethylene terephthalate resin - Google Patents
Method for producing bottle-shaped container mainly made of polyethylene terephthalate resin Download PDFInfo
- Publication number
- CA2455873C CA2455873C CA2455873A CA2455873A CA2455873C CA 2455873 C CA2455873 C CA 2455873C CA 2455873 A CA2455873 A CA 2455873A CA 2455873 A CA2455873 A CA 2455873A CA 2455873 C CA2455873 C CA 2455873C
- Authority
- CA
- Canada
- Prior art keywords
- blow
- molded article
- intermediate molded
- high pressure
- molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229920000139 polyethylene terephthalate Polymers 0.000 title claims abstract description 30
- 239000005020 polyethylene terephthalate Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- -1 polyethylene terephthalate Polymers 0.000 title claims abstract description 15
- 229920005989 resin Polymers 0.000 title description 5
- 239000011347 resin Substances 0.000 title description 5
- 238000000071 blow moulding Methods 0.000 claims abstract description 68
- 239000002184 metal Substances 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 238000007493 shaping process Methods 0.000 claims abstract description 22
- 230000008602 contraction Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 239000000047 product Substances 0.000 description 16
- 239000012467 final product Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 235000013361 beverage Nutrition 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000002459 sustained effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
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- B29C49/6409—Thermal conditioning of preforms
- B29C49/6418—Heating of preforms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
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- B29C49/642—Heating of preforms and shrinking of the preform
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
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- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C2049/6607—Flushing blown articles
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- B29C2049/6646—Flushing blown articles while keeping the final blowing pressure in the article
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C49/783—Measuring, controlling or regulating blowing pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
- B29C2049/7861—Temperature of the preform
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
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- B29C49/786—Temperature
- B29C2049/7864—Temperature of the mould
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- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
- B29K2995/0017—Heat stable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0065—Permeability to gases
- B29K2995/0067—Permeability to gases non-permeable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/90—Direct application of fluid pressure differential to shape, reshape, i.e. distort, or sustain an article or preform and heat-setting, i.e. crystallizing of stretched or molecularly oriented portion thereof
- Y10S264/905—Direct application of fluid pressure differential to shape, reshape, i.e. distort, or sustain an article or preform and heat-setting, i.e. crystallizing of stretched or molecularly oriented portion thereof having plural, distinct differential fluid pressure shaping steps
- Y10S264/906—And heat-shrinking outside of mold including subsequent re-expanding of shrunken article using differential fluid pressure
Abstract
A method for producing a bottle-shaped container that is highly thermally resistant and shows an excellent shaping/shape-keeping property in a short period of time is provided. The method for producing the bottle-shaped container mainly made of polyethylene terephthalate comprises the steps of: first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article; causing thermal contraction of the primary intermediate molded aritcle by heating the primary intermediate molded article, to form a secondary intermediate molded article; and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, characterized in that in the second biaxially-oriented blow-molding step, fluid is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article.
Description
METHOD FOR PRODUCING BOTTLE-SHAPED CONTAINER
MAINLY MADE OF POLYETHYLENE TEREPHTHALATE RESIN
FIELD OF THE INVENTION
This invention relates to a method for producing a bottle mainly made of polyethylene terephthalate (to be referred to as PET hereinafter). More particularly, it relates to a method for producing a bottle mainly made of polyethylene terephthalate that is highly thermally resistant and shows an excellent shaping/shape-keeping property.
BACKGROUND OF THE INVENTION
PET is being popularly and broadly used for containers for beverage etc., because of its high transparency and mechanical strength. PET containers are normally produced by biaxially-oriented blow-molding.
Biaxially-oriented blow-molding is popularly used for molding beverage bottles and other containers mainly made of PET. When producing a PET
container by this method, pressurized fluid, which is typically air, is blown into a preform that has been prepared in advance by injection molding.
In the case of beverage bottles and other containers for containing food, the content filled in the bottle may be heated for sterilization and/or other purposes, so that containers are required to be thermally resistant. To produce a thermally resistant PET container by biaxially-oriented blow-molding, the metal mold is heated to a relatively high temperature between 140 and 150 C, and the molded bottle is heat set in order to raise the thermal resistance of the molded container or bottle.
However, the above described biaxially-oriented blow-molding process may give rise to a shape-keeping problem to the molded container. If the blow-molding process is conducted with a metal mold heated to a temperature level higher than the glass transition temperature (Tg), the molded bottle may produce sinks as the metal mold temperature rises, so that the capacity or the volume of the molded bottle falls or decreases linearly. Particularly, if the -I-temperature of the metal mold is above 110, the appearance of the bottle may be remarkably damaged. Thus, there is a demand for a method for producing a bottle that is highly thermally resistant and shows an excellent shaping/shape-keeping property.
Additionally, since bottles mainly made of PET are normally produced on a mass production basis, there is a demand for reducing the producing time.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a method for producing a container, or a bottle, that is highly thermally resistant and shows an excellent shaping/shape-keeping property in a short period of time.
In an aspect of the present invention, the above object is achieved by providing a method for producing a bottle mainly by using PET comprising the steps of:
forming a primary intermediate molded article by primary biaxially-oriented blow-molding, using a preform mainly made of PET and a first metal mold;
forming a secondary intermediate molded article by heating to cause thermal contraction of the primary intermediate molded article; and subjecting the secondary intermediate molded article to secondary blow-molding, using a second metal mold;
the secondary intermediate molded article being expanded by blowing fluid into it and subsequently cooled by causing the fluid to circulate in it in the step of secondary blow-molding.
Preferably, fluid under high pressure is blown into the secondary intermediate molded article for a high pressure blow time of maintaining high pressure to reduce the high pressure blow time.
Preferably, said primary biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform for the high pressure blow period of maintaining high pressure to reduce the high pressure blow time.
Preferably, said high pressure blow time is a period of time suitable for providing a good shaping/shape-keeping property.
According to an aspect of the present invention there is provided a method for producing a bottle-shaped container mainly made of polyethylene terephthalate, the method comprising the steps of:
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid under high pressure is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article, so as to minimize high pressure blow time.
According to another aspect of the present invention there is provided a method for producing a bottle-shaped container mainly made of polyethylene terephthalate, the method comprising the steps of.
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid is blown into the secondary intermediate molded article to expand the secondary intermediate article, and further fluid is blown into and circulated in the expanded article;
wherein said first biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform so as to minimize high pressure blow time.
PREFERRED EMBODIMENTS OF THE INVENTION
According to the invention, firstly a preform is prepared by injection molding of the raw material, which is mainly made of PET. The preform may be prepared by any known method for the purpose of the invention.
For the purpose of the invention, a raw material that is mainly PET may be resin comprising only PET, or resin added or blended with a barrier substance and/or other additives to polyethylene terephthalate. Barrier substances that can be used for the purpose of the invention non-limitatively include polyethylene naphthalate (PEN), methaxylylene diamineadipamide (MXD-6) and ethyl ene-vinylacetate copolymer (EVOH), although some other known barrier substance may alternatively be used.
Both the raw material and the bottle may have a single-layer structure or a multi-layer structure. For example, a three-layer or five-layer structure formed by using two or more resins selected from PET, a barrier substance, a blend thereof and other substances may be used, although some other structure may alternatively be used.
Then, said preform is biaxially-oriented blow-molded to form a primary intermediary molded article (first biaxially-oriented blow-molding). A known biaxially-oriented blow-molding method may be used for the first biaxially-oriented blow-molding. The preform is heated to temperature (90 to 130 C) that allows a blow-molding operation to be conducted, and fluid (such as air) under high pressure is blown into the perform, using a first metal mold. The temperature of the first metal mold is preferably between 50 and 230 C.
The known biaxially-oriented blow-molding method may be used for the first blow-molding as described above. In addition, according to the present -3a-invention, the high pressure blow time (during which high pressure is maintained in the first biaxially-oriented blow-molding) can be reduced, because the shaping/shape-keeping property of the final product is improved by conducting an operation of circulating air in the second blow-molding step in a manner as described hereinafter and hence the primary intermediate molded article can be prepared even if the fluid under high pressure is blown in a short period of time.
The primary intermediate molded article is made larger than the final product of bottle, and subsequently turned into a secondary intermediate molded article.
The primary intermediate molded article obtained by the first biaxially-oriented blow-molding step is released from the first metal mold, and is heated to 110 to 255 9C to force the primary intermediate molded article to cause thermal contraction of the primary intermediate product to form a secondary intermediate molded article. The heating temperature is preferably higher than the temperature of the first metal mold used for the first biaxially-oriented blow-molding step by 20 to 60 CC. As the primary intermediate molded article is heated to such high temperature, the internal stress of the molded product generated in the first biaxially-oriented blow-molding step is alleviated, and the primary intermediate molded article is allowed to thermally contract to turn itself into a secondary intermediate molded article.
The secondary intermediate molded article has dimensions substantially same as or slightly smaller than the final product of the container.
The secondary intermediate molded article obtained as a result of thermal contraction is subjected to a secondary blow-molding step, using a second metal mold heated to 60 to 120 CC, to obtain a final product of the container.
In the secondary blow-molding step, air is forced to circulate in the molded product at room temperature in the present invention. More specifically, fluid (air) under high pressure is supplied through the inside of a drawing core shaft to flow into the secondary intermediary blow molded product to produce a final product of bottle as the conventional method. According to the present invention, after the intermediate molded article is expanded by blowing the fluid under high pressure, further fluid such as air is continuously blown into the intermediate molded article, and is forced to circulate in and cool the molded article.
The pressure level required for the air circulation may be slightly lower than the pressure level required for the blow-molding, because it is only necessary to force air to circulate in the molded article. The pressure for the air circulation may be lowered during the air circulation gradually or stepwise. If the air pressure is reduced stepwise, it may be reduced in a single step or in two steps.
The duration of the secondary blow-molding step includes (1) the time necessary for raising the fluid (or air) pressure to a predetermined pressure level for blow-molding (e. g., about 40 MPa), (2) the time necessary for blowing fluid under sustained high pressure for blow-molding, and (3) the time necessary for reducing the pressure and causing fluid to circulate in the molded article.
When the pressure is lowered stepwise (in a single step), the duration includes (1) the time necessary for raising the pressure to a predetermined pressure level, (2) the time necessary for blowing fluid under sustained high pressure for blow-molding, and (3) the time necessary for reducing the pressure to an intermediate pressure level (e. g., about 10 to 20 MPa) and causing air to circulate in the molded product (from the time of the start of lowering the pressure level to the time when the sustenance of the intermediary pressure level is terminated).
According to the invention, although the time (3) for air circulation is further required if compared with a conventional process (having no air circulation), the time (2) for blowing fluid under high pressure can be reduced according to the present invention. Thus, according to the present invention, it is possible to reduce the total time necessary for the second blow-molding step.
Note that the time (2) necessary for blowing air under high pressure is such that an excellent shaping/shape-keeping property is appropriately obtained for the final product.
The temperature of the second metal mold in the present invnetion does not need to be raised to the high temperature level (140 to 150 9C) like the above described conventional methods in which a biaxially-oriented blow-molding operation is carried out in a single step. In other words, for the purpose of the present invention, the temperature of the second metal mold may be as low as about 105 C for producing a thermally resistant bottle.
Otherwise, any known conventional blow-molding method may be applied to the second blow-molding step of the method according to the invention.
As described above, according to the invention, it is now possible to produce a container mainly made of PET having highly thermally resistant and showing an excellent shaping/shape-keeping property in a relatively short period of time if compared with the prior art. Presumably, this is because, as fluid (air) is forced to circulate in the second blow-molding step, a convection current of air arises in the molded article in the second metal mold, to cool and harden the inner surface of the molded article so that, as a result, the molded product shows an excellent shaping/shape-keeping property.
Since the molded product shows an excellent shaping/shape-keeping property, the time necessary for blowing fluid (air) under high pressure can be reduced to make it possible to reduce the total time necessary for the second blow-molding step and improve the production efficiency.
Additionally, since the primary intermediate molded article is heated in the heating/contraction step to raise the crystal density and to reduce the internal stress, the molded product is provided with a high thermal resistance.
Therefore, a highly thermally resistant container can be produced even if the temperature of the second metal mold used in the second blow-molding step is not raised remarkably.
Thus, the time required for raising the temperature of the second metal mold to a predetermined temperature level is reduced along with the time necessary for blowing air under high pressure, to make it possible to produce a bottle that is highly thermally resistant and shows an excellent shaping/shape-keeping property in a reduced period of time.
The method for the present invention is applicable not only to producing beverage bottles but also to producing other containers.
Examples In each example and comparative example, 10 bottles were molded as specimens.
Comparative Example 1 Ten performs were prepared by injection molding of PET.
Each of the performs was heated to 110 C and is biaxially-oriented blow-molded in the first metal mold, to obtain a primary intermediate molded article. The temperature of the first metal mold was 160 C, and the air blowing time was 2.95 seconds as listed in Table 1.
The primary intermediate molded article was taken out of the first metal mold, and heated to 185 C to be thermally contracted to obtain a secondary intermediate molded article.
The secondary intermediate molded article was heated to 160 'C, and blow-molded in a second metal mold, to obtain a final product of bottle. The temperature of the second metal mold was 105 C, the temperature of the air was 25 C, and the air blowing time under high pressure (39 MPa) was 2.85 seconds as listed in Table 1. Further air was not blown to circulate in the secondary blow-molding step in this comparative example.
The obtained 10 final products were observed for total height and capacity, and the averages were calculated. Similarly, the shaping/shape-keeping property of each of the specimens was checked by determining the standard deviation of the total height and that of the capacity of the specimen. The obtained results are summarily shown in Table 1.
The thermal resistance of each of the obtained final products was tested by filling the product with hot water heated to 93 C, hermetically sealing the bottle, showering it with hot water heated to 75 C for 3 minutes, and by visually observing it for deformation. Table 1 also shows the obtained results.
Example 1 The process of Comparative Example 1 was followed except that the time of blowing air under high pressure was reduced in the second blow-molding step and that air was forced to circulate in the intermediate molded article in the secondary blow-molding step. 10 specimens of final products were obtained as in Comparative Example 1.
Air was made to circulate, while reducing the air pressure from a high pressure level (39 MPa) to 25.3 Mpa, maintaining 25.3 Mpa (for 0.2 seconds from the pressure fall to the termination of sustenance of pressure), further reducing the air pressure from 23.5 MPa to 16.6 MPa and maintaining 16.6 MPa (for 0.1 seconds from the pressure fall to the termination of the sustenance of pressure), and subsequently released the air. Thus, the total air circulation time was 0.3 seconds.
The time of blowing air under high pressure in the second blow-molding step, the air circulation time in the second blow-molding step, the shaping/shape-keeping property,. and the thermal resistance of the final products are listed in Table 1.
Examples 2 through 4 In each example, the process of Example 1 was followed except that the time of blowing air under high pressure in the second blow-molding step was modified and the blowing time of the first biaxially-oriented blow-molding step was reduced. 10 specimens of final products were prepared in each example.
The blowing time of the first blow-molding step, the time of blowing air under high pressure in the second blow-molding step, and the air circulation time in the second blow-molding step, the shaping/shape-keeping property and the thermal resistance of the final products are listed in Table 1.
MAINLY MADE OF POLYETHYLENE TEREPHTHALATE RESIN
FIELD OF THE INVENTION
This invention relates to a method for producing a bottle mainly made of polyethylene terephthalate (to be referred to as PET hereinafter). More particularly, it relates to a method for producing a bottle mainly made of polyethylene terephthalate that is highly thermally resistant and shows an excellent shaping/shape-keeping property.
BACKGROUND OF THE INVENTION
PET is being popularly and broadly used for containers for beverage etc., because of its high transparency and mechanical strength. PET containers are normally produced by biaxially-oriented blow-molding.
Biaxially-oriented blow-molding is popularly used for molding beverage bottles and other containers mainly made of PET. When producing a PET
container by this method, pressurized fluid, which is typically air, is blown into a preform that has been prepared in advance by injection molding.
In the case of beverage bottles and other containers for containing food, the content filled in the bottle may be heated for sterilization and/or other purposes, so that containers are required to be thermally resistant. To produce a thermally resistant PET container by biaxially-oriented blow-molding, the metal mold is heated to a relatively high temperature between 140 and 150 C, and the molded bottle is heat set in order to raise the thermal resistance of the molded container or bottle.
However, the above described biaxially-oriented blow-molding process may give rise to a shape-keeping problem to the molded container. If the blow-molding process is conducted with a metal mold heated to a temperature level higher than the glass transition temperature (Tg), the molded bottle may produce sinks as the metal mold temperature rises, so that the capacity or the volume of the molded bottle falls or decreases linearly. Particularly, if the -I-temperature of the metal mold is above 110, the appearance of the bottle may be remarkably damaged. Thus, there is a demand for a method for producing a bottle that is highly thermally resistant and shows an excellent shaping/shape-keeping property.
Additionally, since bottles mainly made of PET are normally produced on a mass production basis, there is a demand for reducing the producing time.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a method for producing a container, or a bottle, that is highly thermally resistant and shows an excellent shaping/shape-keeping property in a short period of time.
In an aspect of the present invention, the above object is achieved by providing a method for producing a bottle mainly by using PET comprising the steps of:
forming a primary intermediate molded article by primary biaxially-oriented blow-molding, using a preform mainly made of PET and a first metal mold;
forming a secondary intermediate molded article by heating to cause thermal contraction of the primary intermediate molded article; and subjecting the secondary intermediate molded article to secondary blow-molding, using a second metal mold;
the secondary intermediate molded article being expanded by blowing fluid into it and subsequently cooled by causing the fluid to circulate in it in the step of secondary blow-molding.
Preferably, fluid under high pressure is blown into the secondary intermediate molded article for a high pressure blow time of maintaining high pressure to reduce the high pressure blow time.
Preferably, said primary biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform for the high pressure blow period of maintaining high pressure to reduce the high pressure blow time.
Preferably, said high pressure blow time is a period of time suitable for providing a good shaping/shape-keeping property.
According to an aspect of the present invention there is provided a method for producing a bottle-shaped container mainly made of polyethylene terephthalate, the method comprising the steps of:
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid under high pressure is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article, so as to minimize high pressure blow time.
According to another aspect of the present invention there is provided a method for producing a bottle-shaped container mainly made of polyethylene terephthalate, the method comprising the steps of.
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid is blown into the secondary intermediate molded article to expand the secondary intermediate article, and further fluid is blown into and circulated in the expanded article;
wherein said first biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform so as to minimize high pressure blow time.
PREFERRED EMBODIMENTS OF THE INVENTION
According to the invention, firstly a preform is prepared by injection molding of the raw material, which is mainly made of PET. The preform may be prepared by any known method for the purpose of the invention.
For the purpose of the invention, a raw material that is mainly PET may be resin comprising only PET, or resin added or blended with a barrier substance and/or other additives to polyethylene terephthalate. Barrier substances that can be used for the purpose of the invention non-limitatively include polyethylene naphthalate (PEN), methaxylylene diamineadipamide (MXD-6) and ethyl ene-vinylacetate copolymer (EVOH), although some other known barrier substance may alternatively be used.
Both the raw material and the bottle may have a single-layer structure or a multi-layer structure. For example, a three-layer or five-layer structure formed by using two or more resins selected from PET, a barrier substance, a blend thereof and other substances may be used, although some other structure may alternatively be used.
Then, said preform is biaxially-oriented blow-molded to form a primary intermediary molded article (first biaxially-oriented blow-molding). A known biaxially-oriented blow-molding method may be used for the first biaxially-oriented blow-molding. The preform is heated to temperature (90 to 130 C) that allows a blow-molding operation to be conducted, and fluid (such as air) under high pressure is blown into the perform, using a first metal mold. The temperature of the first metal mold is preferably between 50 and 230 C.
The known biaxially-oriented blow-molding method may be used for the first blow-molding as described above. In addition, according to the present -3a-invention, the high pressure blow time (during which high pressure is maintained in the first biaxially-oriented blow-molding) can be reduced, because the shaping/shape-keeping property of the final product is improved by conducting an operation of circulating air in the second blow-molding step in a manner as described hereinafter and hence the primary intermediate molded article can be prepared even if the fluid under high pressure is blown in a short period of time.
The primary intermediate molded article is made larger than the final product of bottle, and subsequently turned into a secondary intermediate molded article.
The primary intermediate molded article obtained by the first biaxially-oriented blow-molding step is released from the first metal mold, and is heated to 110 to 255 9C to force the primary intermediate molded article to cause thermal contraction of the primary intermediate product to form a secondary intermediate molded article. The heating temperature is preferably higher than the temperature of the first metal mold used for the first biaxially-oriented blow-molding step by 20 to 60 CC. As the primary intermediate molded article is heated to such high temperature, the internal stress of the molded product generated in the first biaxially-oriented blow-molding step is alleviated, and the primary intermediate molded article is allowed to thermally contract to turn itself into a secondary intermediate molded article.
The secondary intermediate molded article has dimensions substantially same as or slightly smaller than the final product of the container.
The secondary intermediate molded article obtained as a result of thermal contraction is subjected to a secondary blow-molding step, using a second metal mold heated to 60 to 120 CC, to obtain a final product of the container.
In the secondary blow-molding step, air is forced to circulate in the molded product at room temperature in the present invention. More specifically, fluid (air) under high pressure is supplied through the inside of a drawing core shaft to flow into the secondary intermediary blow molded product to produce a final product of bottle as the conventional method. According to the present invention, after the intermediate molded article is expanded by blowing the fluid under high pressure, further fluid such as air is continuously blown into the intermediate molded article, and is forced to circulate in and cool the molded article.
The pressure level required for the air circulation may be slightly lower than the pressure level required for the blow-molding, because it is only necessary to force air to circulate in the molded article. The pressure for the air circulation may be lowered during the air circulation gradually or stepwise. If the air pressure is reduced stepwise, it may be reduced in a single step or in two steps.
The duration of the secondary blow-molding step includes (1) the time necessary for raising the fluid (or air) pressure to a predetermined pressure level for blow-molding (e. g., about 40 MPa), (2) the time necessary for blowing fluid under sustained high pressure for blow-molding, and (3) the time necessary for reducing the pressure and causing fluid to circulate in the molded article.
When the pressure is lowered stepwise (in a single step), the duration includes (1) the time necessary for raising the pressure to a predetermined pressure level, (2) the time necessary for blowing fluid under sustained high pressure for blow-molding, and (3) the time necessary for reducing the pressure to an intermediate pressure level (e. g., about 10 to 20 MPa) and causing air to circulate in the molded product (from the time of the start of lowering the pressure level to the time when the sustenance of the intermediary pressure level is terminated).
According to the invention, although the time (3) for air circulation is further required if compared with a conventional process (having no air circulation), the time (2) for blowing fluid under high pressure can be reduced according to the present invention. Thus, according to the present invention, it is possible to reduce the total time necessary for the second blow-molding step.
Note that the time (2) necessary for blowing air under high pressure is such that an excellent shaping/shape-keeping property is appropriately obtained for the final product.
The temperature of the second metal mold in the present invnetion does not need to be raised to the high temperature level (140 to 150 9C) like the above described conventional methods in which a biaxially-oriented blow-molding operation is carried out in a single step. In other words, for the purpose of the present invention, the temperature of the second metal mold may be as low as about 105 C for producing a thermally resistant bottle.
Otherwise, any known conventional blow-molding method may be applied to the second blow-molding step of the method according to the invention.
As described above, according to the invention, it is now possible to produce a container mainly made of PET having highly thermally resistant and showing an excellent shaping/shape-keeping property in a relatively short period of time if compared with the prior art. Presumably, this is because, as fluid (air) is forced to circulate in the second blow-molding step, a convection current of air arises in the molded article in the second metal mold, to cool and harden the inner surface of the molded article so that, as a result, the molded product shows an excellent shaping/shape-keeping property.
Since the molded product shows an excellent shaping/shape-keeping property, the time necessary for blowing fluid (air) under high pressure can be reduced to make it possible to reduce the total time necessary for the second blow-molding step and improve the production efficiency.
Additionally, since the primary intermediate molded article is heated in the heating/contraction step to raise the crystal density and to reduce the internal stress, the molded product is provided with a high thermal resistance.
Therefore, a highly thermally resistant container can be produced even if the temperature of the second metal mold used in the second blow-molding step is not raised remarkably.
Thus, the time required for raising the temperature of the second metal mold to a predetermined temperature level is reduced along with the time necessary for blowing air under high pressure, to make it possible to produce a bottle that is highly thermally resistant and shows an excellent shaping/shape-keeping property in a reduced period of time.
The method for the present invention is applicable not only to producing beverage bottles but also to producing other containers.
Examples In each example and comparative example, 10 bottles were molded as specimens.
Comparative Example 1 Ten performs were prepared by injection molding of PET.
Each of the performs was heated to 110 C and is biaxially-oriented blow-molded in the first metal mold, to obtain a primary intermediate molded article. The temperature of the first metal mold was 160 C, and the air blowing time was 2.95 seconds as listed in Table 1.
The primary intermediate molded article was taken out of the first metal mold, and heated to 185 C to be thermally contracted to obtain a secondary intermediate molded article.
The secondary intermediate molded article was heated to 160 'C, and blow-molded in a second metal mold, to obtain a final product of bottle. The temperature of the second metal mold was 105 C, the temperature of the air was 25 C, and the air blowing time under high pressure (39 MPa) was 2.85 seconds as listed in Table 1. Further air was not blown to circulate in the secondary blow-molding step in this comparative example.
The obtained 10 final products were observed for total height and capacity, and the averages were calculated. Similarly, the shaping/shape-keeping property of each of the specimens was checked by determining the standard deviation of the total height and that of the capacity of the specimen. The obtained results are summarily shown in Table 1.
The thermal resistance of each of the obtained final products was tested by filling the product with hot water heated to 93 C, hermetically sealing the bottle, showering it with hot water heated to 75 C for 3 minutes, and by visually observing it for deformation. Table 1 also shows the obtained results.
Example 1 The process of Comparative Example 1 was followed except that the time of blowing air under high pressure was reduced in the second blow-molding step and that air was forced to circulate in the intermediate molded article in the secondary blow-molding step. 10 specimens of final products were obtained as in Comparative Example 1.
Air was made to circulate, while reducing the air pressure from a high pressure level (39 MPa) to 25.3 Mpa, maintaining 25.3 Mpa (for 0.2 seconds from the pressure fall to the termination of sustenance of pressure), further reducing the air pressure from 23.5 MPa to 16.6 MPa and maintaining 16.6 MPa (for 0.1 seconds from the pressure fall to the termination of the sustenance of pressure), and subsequently released the air. Thus, the total air circulation time was 0.3 seconds.
The time of blowing air under high pressure in the second blow-molding step, the air circulation time in the second blow-molding step, the shaping/shape-keeping property,. and the thermal resistance of the final products are listed in Table 1.
Examples 2 through 4 In each example, the process of Example 1 was followed except that the time of blowing air under high pressure in the second blow-molding step was modified and the blowing time of the first biaxially-oriented blow-molding step was reduced. 10 specimens of final products were prepared in each example.
The blowing time of the first blow-molding step, the time of blowing air under high pressure in the second blow-molding step, and the air circulation time in the second blow-molding step, the shaping/shape-keeping property and the thermal resistance of the final products are listed in Table 1.
Note that the time of blowing air under high pressure of Example 4 may not be suitable for providing a good shaping/shape-keeping property.
Therefore, as far as the time of blowing air under high pressure, Example 4 should be regarded as comparative example.
Table 1 Blow Blow time in Shaping/ Shaping/ Thermal time second shape- shape- resistance in blow-moldin keeping keeping first property properly blow- (total kcapacity or mold- height) volume) ing under air total aver- stand- ave- stand-high circu- age and rage and pres- lation devi- devi-sure ation ation Com. 2.95 2.85 none 2.85 253.18 0.20 914.09 3.46 no defor-Ex. 1 sec. sec. sec. mm ml mation Ex. 1 2.95 2.55 0.3 2.85 253.14 0.12 924.82 1.09 no defor-sec. sec. sec. sec. mm ml mation Ex. 2 2.20 1.80 0.3 2.10 253.07 0.07 921.16 1.33 no defor-sec. sec. sec. sec. mm ml mation (-0.75 (-0.75 sec.) sec.) Ex. 3 1.70 1.30 0.3 1.60 253.07 0.09 918.58 1.53 no defor-sec. sec. sec. sec. mm ml mation (1.25 (-1.25 sec.) sec.) Ex. 4 1.45 1.05 0.3 1.35 253.01 0.07 919.59 2.03 no defor-sec. sec. sec. sec. mm ml mation (1.50 (1.50 sec.) sec.) By comparing Comparative Example 1 and Example 1, it will be seen that the standard deviation of total height is reduced and the standard deviation of capacity is remarkably improved, if air is circulated without changing the total blow time in the secondary blow-molding step even if the high pressure blow time of the second blow-molding step is reduced. Additionally, the thermal resistance was satisfactory.
When the high pressure blow time of the second blow-molding step is further reduced along with the high pressure blow time of the first biaxially-oriented blow-molding step, the shaping/shape-keeping property is improved particularly in terms of total height as seen from the results of Examples 2 and 3. When the parameters of Example 3 are used, the blow time of the first blow-molding step is reduced from 2.20 seconds of Comparatively Example 1 to 1.70 seconds, and the blow time of the second blow-molding step is reduced from 2.10 seconds of the Comparatively Example 1 to 1.60 seconds, to realize an overall time reduction of about 30 %.
The shaping/shape-keeping property is also improved when the parameters of Example 4 are used.
As described above in detail, according to the invention, air is made to flow in the molded bottle by forcing air to circulate in the second molding step, to cool the molded bottle from the inside so as to suppress any excessive crystal growth. As a result, the shaping/shape-keeping property of the bottle is improved so that the dimensional variances of products are reduced and the ratio of defective products is minimized to improve the cost performance of bottle producing.
Additionally, the high pressure blow time is reduced to by turn reduce the cycle time of the process of molding a perform and producing a bottle as final product and hence improve the productivity.
Therefore, as far as the time of blowing air under high pressure, Example 4 should be regarded as comparative example.
Table 1 Blow Blow time in Shaping/ Shaping/ Thermal time second shape- shape- resistance in blow-moldin keeping keeping first property properly blow- (total kcapacity or mold- height) volume) ing under air total aver- stand- ave- stand-high circu- age and rage and pres- lation devi- devi-sure ation ation Com. 2.95 2.85 none 2.85 253.18 0.20 914.09 3.46 no defor-Ex. 1 sec. sec. sec. mm ml mation Ex. 1 2.95 2.55 0.3 2.85 253.14 0.12 924.82 1.09 no defor-sec. sec. sec. sec. mm ml mation Ex. 2 2.20 1.80 0.3 2.10 253.07 0.07 921.16 1.33 no defor-sec. sec. sec. sec. mm ml mation (-0.75 (-0.75 sec.) sec.) Ex. 3 1.70 1.30 0.3 1.60 253.07 0.09 918.58 1.53 no defor-sec. sec. sec. sec. mm ml mation (1.25 (-1.25 sec.) sec.) Ex. 4 1.45 1.05 0.3 1.35 253.01 0.07 919.59 2.03 no defor-sec. sec. sec. sec. mm ml mation (1.50 (1.50 sec.) sec.) By comparing Comparative Example 1 and Example 1, it will be seen that the standard deviation of total height is reduced and the standard deviation of capacity is remarkably improved, if air is circulated without changing the total blow time in the secondary blow-molding step even if the high pressure blow time of the second blow-molding step is reduced. Additionally, the thermal resistance was satisfactory.
When the high pressure blow time of the second blow-molding step is further reduced along with the high pressure blow time of the first biaxially-oriented blow-molding step, the shaping/shape-keeping property is improved particularly in terms of total height as seen from the results of Examples 2 and 3. When the parameters of Example 3 are used, the blow time of the first blow-molding step is reduced from 2.20 seconds of Comparatively Example 1 to 1.70 seconds, and the blow time of the second blow-molding step is reduced from 2.10 seconds of the Comparatively Example 1 to 1.60 seconds, to realize an overall time reduction of about 30 %.
The shaping/shape-keeping property is also improved when the parameters of Example 4 are used.
As described above in detail, according to the invention, air is made to flow in the molded bottle by forcing air to circulate in the second molding step, to cool the molded bottle from the inside so as to suppress any excessive crystal growth. As a result, the shaping/shape-keeping property of the bottle is improved so that the dimensional variances of products are reduced and the ratio of defective products is minimized to improve the cost performance of bottle producing.
Additionally, the high pressure blow time is reduced to by turn reduce the cycle time of the process of molding a perform and producing a bottle as final product and hence improve the productivity.
Claims (9)
1. A method for producing a bottle-shaped container mainly made of polyethylene terephthalate, the method comprising the steps of:
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid under high pressure is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article, so as to minimize high pressure blow time.
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid under high pressure is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article, so as to minimize high pressure blow time.
2. The method according to claim 1, wherein said first biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform so as to minimize the high pressure blow time.
3. The method according to claim 1 or 2, wherein said high pressure blow time is a period of time suitable for providing a good shaping/shape-keeping property.
4. The method according to any one of claims 1 to 3, wherein said high pressure is greater than 20 Mpa.
5. The method according to any one of claims 1 to 3, wherein said high pressure is greater than 25.3 Mpa.
6. A method for producing a bottle-shaped container mainly made of polyethylene terephthalate, the method comprising the steps of:
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid is blown into the secondary intermediate molded article to expand the secondary intermediate article, and further fluid is blown into and circulated in the expanded article;
wherein said first biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform so as to minimize high pressure blow time.
first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, wherein in the second biaxially-oriented blow-molding step, fluid is blown into the secondary intermediate molded article to expand the secondary intermediate article, and further fluid is blown into and circulated in the expanded article;
wherein said first biaxially-oriented blow-molding is realized by blowing fluid under high pressure into the preform so as to minimize high pressure blow time.
7. The method according to claim 6, wherein said high pressure blow time is a period of time suitable for providing a good shaping/shape-keeping property.
8. The method according to claim 6 or 7, wherein said high pressure is greater than 20 MPa.
9. The method according to claim 6 or 7, wherein said high pressure is greater than 25.3 MPa.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2001-231900 | 2001-07-31 | ||
JP2001231900A JP2003039538A (en) | 2001-07-31 | 2001-07-31 | Method for manufacturing bottle composed mainly of polyethylene terephthalate resin |
PCT/JP2002/007785 WO2003011569A1 (en) | 2001-07-31 | 2002-07-31 | Method of manufacturing bottle formed mainly of polyethylene terephthalate resin |
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CA2455873A1 CA2455873A1 (en) | 2003-02-13 |
CA2455873C true CA2455873C (en) | 2010-09-21 |
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CA2455873A Expired - Fee Related CA2455873C (en) | 2001-07-31 | 2002-07-31 | Method for producing bottle-shaped container mainly made of polyethylene terephthalate resin |
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US (1) | US7485251B2 (en) |
EP (1) | EP1424187B1 (en) |
JP (1) | JP2003039538A (en) |
KR (1) | KR100884866B1 (en) |
CN (1) | CN1239311C (en) |
CA (1) | CA2455873C (en) |
WO (1) | WO2003011569A1 (en) |
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BE1016119A3 (en) * | 2004-07-14 | 2006-03-07 | Delta Engineering Bv Met Beper | METHOD FOR BLOWING OBJECTS |
CN100439083C (en) * | 2005-04-30 | 2008-12-03 | 蔡佳翰 | Full automatic bottle blowing technology for heat resistant bottle and bottle blowing machine for implementing said technology |
KR101305230B1 (en) * | 2005-06-29 | 2013-09-12 | 가부시키가이샤 요시노 고교쇼 | Container made of polyester resin and method for molding thereof |
ITBO20060499A1 (en) * | 2006-06-29 | 2007-12-30 | Techne Technipack Engineering | PROCEDURE AND APPARATUS TO DECREASE THE CYCLE TIMES IN MACHINES FOR THE PRODUCTION OF THERMOPLASTIC MANUFACTURED ARTICLES WITH THE BLOWING THERMOFORMING PROCESS |
US20080230954A1 (en) * | 2007-03-20 | 2008-09-25 | Green Harvest Technologies, Llc | Injection Stretch Blow Molded Polylactide Bottle and Process For Making Same |
KR101301644B1 (en) * | 2008-12-17 | 2013-08-29 | 토요세이깐 가부시키가이샤 | Method for producing synthetic resin container |
CN102010580B (en) * | 2010-11-11 | 2012-11-28 | 东莞市美高容器有限公司 | PET multicolor bottle |
CA2859070C (en) | 2012-01-05 | 2020-04-07 | Amcor Limited | Molding apparatus and method for applying positive pressure to molded container |
KR101644425B1 (en) * | 2015-09-22 | 2016-08-01 | 정순태 | manufacturing methods of drinking container enhanced heat-resistant |
CN112810058A (en) * | 2021-01-04 | 2021-05-18 | 上海川禾包装容器有限公司 | Production process of IPET thickened container |
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US3888961A (en) * | 1972-10-06 | 1975-06-10 | Ingersoll Rand Co | Blow molding process including article cooling |
US5445784A (en) * | 1984-02-15 | 1995-08-29 | Yoshino Kogyosho Co., Ltd. | Method of blow-molding biaxially-oriented polyethylene terephthalate resin bottle-shaped container |
FR2595294B1 (en) * | 1986-03-04 | 1988-07-08 | Sidel Sa | PROCESS AND PLANT FOR MANUFACTURING CONTAINERS, SUCH AS BOTTLES, OF POLYETHYLENETEREPHTHALATE, RESISTANT TO RELATIVELY SEVERED THERMAL CONDITIONS DURING THEIR USE |
JP2592663B2 (en) * | 1988-09-09 | 1997-03-19 | 三菱樹脂株式会社 | Manufacturing method of blow molded container |
US5352402A (en) * | 1989-10-23 | 1994-10-04 | Nissei Asb Machine Co., Ltd. | Method and apparatus for manufacturing biaxially oriented, thermally stable, blown containers |
JPH0639910A (en) * | 1992-07-24 | 1994-02-15 | Denki Kagaku Kogyo Kk | Manufacture of hollow resin container |
FR2714631B1 (en) * | 1993-12-30 | 1996-03-01 | Sidel Sa | Method and installation for the manufacture of containers, in particular bottles, of thermoplastic material. |
JP3047732B2 (en) * | 1994-05-16 | 2000-06-05 | 東洋製罐株式会社 | Manufacturing method of biaxially stretched blow container |
JP3612775B2 (en) | 1995-03-28 | 2005-01-19 | 東洋製罐株式会社 | Heat-resistant pressure-resistant self-supporting container and manufacturing method thereof |
WO1998058790A1 (en) * | 1997-06-20 | 1998-12-30 | Schmalbach-Lubeca Pet Centre Technique Et De Recherche S.A.S | Manufacturing process for heat set multilayer containers |
JP3843335B2 (en) * | 1998-02-18 | 2006-11-08 | 株式会社吉野工業所 | Blow molding method for housing |
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- 2002-07-31 CA CA2455873A patent/CA2455873C/en not_active Expired - Fee Related
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- 2002-07-31 US US10/485,183 patent/US7485251B2/en not_active Expired - Fee Related
- 2002-07-31 WO PCT/JP2002/007785 patent/WO2003011569A1/en active Application Filing
- 2002-07-31 CN CNB028025490A patent/CN1239311C/en not_active Expired - Fee Related
- 2002-07-31 EP EP02755711A patent/EP1424187B1/en not_active Expired - Fee Related
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KR100884866B1 (en) | 2009-02-23 |
WO2003011569A1 (en) | 2003-02-13 |
JP2003039538A (en) | 2003-02-13 |
KR20040020041A (en) | 2004-03-06 |
US20040173950A1 (en) | 2004-09-09 |
US7485251B2 (en) | 2009-02-03 |
EP1424187A4 (en) | 2007-11-14 |
CA2455873A1 (en) | 2003-02-13 |
EP1424187B1 (en) | 2012-06-13 |
CN1464833A (en) | 2003-12-31 |
CN1239311C (en) | 2006-02-01 |
EP1424187A1 (en) | 2004-06-02 |
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