WO2004110325A1 - Absorbent article which includes superabsorbent material located in discrete pockets and manufacturing process - Google Patents

Absorbent article which includes superabsorbent material located in discrete pockets and manufacturing process Download PDF

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Publication number
WO2004110325A1
WO2004110325A1 PCT/EP2004/051118 EP2004051118W WO2004110325A1 WO 2004110325 A1 WO2004110325 A1 WO 2004110325A1 EP 2004051118 W EP2004051118 W EP 2004051118W WO 2004110325 A1 WO2004110325 A1 WO 2004110325A1
Authority
WO
WIPO (PCT)
Prior art keywords
portions
sheets
absorbent article
filled
absorbent material
Prior art date
Application number
PCT/EP2004/051118
Other languages
French (fr)
Other versions
WO2004110325A8 (en
Inventor
Stefano Nanni
Matteo Piantoni
Alberto Perego
Original Assignee
Gdm S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gdm S.P.A. filed Critical Gdm S.P.A.
Publication of WO2004110325A1 publication Critical patent/WO2004110325A1/en
Publication of WO2004110325A8 publication Critical patent/WO2004110325A8/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/5323—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having absorbent material located in discrete regions, e.g. pockets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • A61F13/15642—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres by depositing continuous layers or pads of fibrous material on single sheets or webs

Definitions

  • the present invention relates to an absorbent article and relative production method.
  • the present invention may be used to particular advantage in the manufacture of a flat absorbent article 15 known commercially as an "underblanket", to which the following description refers purely by way of example.
  • a flat absorbent article or underblanket is normally rectangular or square, is relatively large (roughly 20 600x650 mm) , and comprises a layer of absorbent material enclosed in a pocket defined between a sheet of impermeable material and a sheet of porous material glued together.
  • the layer of absorbent material is uniform and housed inside a single 25 pocket. This solution, however, has been found to have drawbacks, on account of prolonged handling of the absorbent article resulting in uneven, non-homogeneous distribution of the absorbent material.
  • an absorbent article as claimed in Claim 1 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 1.
  • a method of producing an absorbent article as claimed in Claim 14 and, preferably in any one of the following Claims depending directly or indirectly on Claim 14.
  • Figure 1 shows a schematic plan view of an absorbent article in accordance with the present invention
  • Figure 2 shows a larger-scale lateral section of part of the absorbent article in Figure 1;
  • Figure 3 shows a schematic side view of part of an automatic machine for producing the absorbent article in Figure 1.
  • Number 1 in Figure 1 indicates as a whole a flat absorbent article or underblanket in the form of a 600x650 mm rectangle.
  • absorbent article 1 comprises a layer of absorbent material 2 enclosed between a bottom sheet 3 of material impermeable to liquid, in particular plastic material, and a top sheet 4 of porous material permeable to liquid, in particular non-woven fabric.
  • the layer of absorbent material 2 comprises filled portions 5, where absorbent material 2 is interposed between sheets 3 and 4; and empty portions 6, where no absorbent material 2 is interposed between sheets 3 and 4, and where sheets 3 and 4 contact each other. More specifically, the respective inner surfaces 7 and 8 of bottom sheet 3 and top sheet 4 are glued, i.e. coated with a layer of glue, so that absorbent material 2 is glued to sheets 3 and 4 at filled portions 5, and sheets 3 and 4 are glued to each other at empty portions 6.
  • inside absorbent article 1, sheets 3 and 4 form a number of pockets, each of which contains a respective part of absorbent material 2, defines a respective filled portion 5, and is separated from the ⁇ other pockets by empty portions 6.
  • empty portions 6 are aligned in a longitudinal direction 9 and a transverse direction 10 incident with respect to each other, so as to define a number of filled portions 5. More specifically, directions 9 and 10 are perpendicular to each other, so that each filled portion 5 is rectangular. In the Figure 1 embodiment, each filled portion 5 is 75 mm square, and each empty portion 6 is 5 mm wide, so that the filled portions 5 are obviously substantially all the same size. In an alternative embodiment not shown, filled portions 5 differ in size depending on their location within absorbent article 1.
  • Absorbent article 1 is in the form of a rectangle bounded by an outer edge 11/ and an annular peripheral filled portion 5a is preferably provided, extends seamlessly along the whole of outer edge 11, and surrounds the other filled portions 5.
  • the peripheral filled portion 5a is obviously the same shape as rectangular outer edge 11, and so defines a "frame" surrounding the other filled portions 5.
  • absorbent article 1 described above is produced on an automatic machine 12, which forms the layer of absorbent material 2 comprising filled portions 5 and empty portions 6 on the peripheral surface 13 of a suction forming drum 14. More specifically, peripheral surface 13 comprises a number of projections 15 reproducing the arrangement of filled portions 5 and empty portions 6 of the layer of absorbent material 2.
  • the layer of absorbent material 2 is fed directly onto inner surface 8 of top sheet 4, which is fed about a feed drum 16 tangent to forming drum 14; and bottom sheet 3 is then superimposed on top sheet 4 so as to sandwich the layer of absorbent material 2 between sheets 3 and 4.
  • Two gluing devices 17 and 18 are provided upstream from forming drum 14 to deposit respective layers of glue on inner surface 7 of bottom sheet 3 and inner surface 8 of top sheet 4.
  • a pressing device 19 is located downstream from forming drum 14 to press together sheets 3 and 4 enclosing the layer of absorbent material 2, by exerting opposite forces on the outer surfaces 20 and 21 of sheets 3 and 4.
  • Pressing device 19 comprises two mutually cooperating rollers 22, between which sheets 3 and 4 enclosing the layer of absorbent material 2 are fed; and rollers 22 comprise respective mutually cooperating projections 23 corresponding with empty portions 6 of absorbent material 2. More specifically, the lateral surface 24 of each roller 2 exerts a relative pressure on filled portions 5, while projections 23 exert a relative pressure on empty portions 6.
  • Pressing device 19 provides for exerting a different pressure on filled portions 5 from that exerted on empty portions 6, so as to ensure firm adhesion of sheets 3 and 4 at empty portions 6, while at the same time safeguarding filled portions 5 against damage by severe mechanical stress.
  • a known cutting station (not shown) cuts individual absorbent articles 1 off the continuous strip of articles 1 so formed.
  • Absorbent article 1 as described above has various advantages over conventional types.
  • the amount of absorbent material 2 required is reduced by the presence of empty portions 6.
  • absorbent material 2 is divided into a number of clearly defined filled portions 5, and so remains in place even after prolonged handling.

Abstract

An absorbent article (1) having a layer of absorbent material (2) enclosed between a sheet (3) of impermeable material and a sheet (4) of porous material; the layer of absorbent material (2) has filled portions (5) where absorbent material (2) is interposed between the two sheets (3, 4), and empty portions (6) where no absorbent material (2) is interposed between the two sheets (3, 4) and where the two sheets (3, 4) contact each other; and the empty portions (6) are aligned in two directions perpendicular to each other to define a number of square filled portions (5).

Description

ABSORBENT ARTICLE WHICH INCLUDES SUPERABSORBENT MATERIAL LOCATED IN DISCRETE
POCKETS AND MANUFACTURING PROCESS
10 TECHNICAL FIELD
The present invention relates to an absorbent article and relative production method.
The present invention may be used to particular advantage in the manufacture of a flat absorbent article 15 known commercially as an "underblanket", to which the following description refers purely by way of example. BACKGROUND ART
A flat absorbent article or underblanket is normally rectangular or square, is relatively large (roughly 20 600x650 mm) , and comprises a layer of absorbent material enclosed in a pocket defined between a sheet of impermeable material and a sheet of porous material glued together. In known flat absorbent articles, the layer of absorbent material is uniform and housed inside a single 25 pocket. This solution, however, has been found to have drawbacks, on account of prolonged handling of the absorbent article resulting in uneven, non-homogeneous distribution of the absorbent material. DISCLOSURE OF INVENTION
It is an object of the present invention to provide an absorbent article designed to eliminate the aforementioned drawbacks, and which, in particular, is cheap and easy to produce.
According to the present invention, there is provided an absorbent article as claimed in Claim 1 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 1. According to the present invention, there is also provided a method of producing an absorbent article, as claimed in Claim 14 and, preferably in any one of the following Claims depending directly or indirectly on Claim 14. BRIEF DESCRIPTION OF THE DRAWINGS
A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows a schematic plan view of an absorbent article in accordance with the present invention;
Figure 2 shows a larger-scale lateral section of part of the absorbent article in Figure 1;
Figure 3 shows a schematic side view of part of an automatic machine for producing the absorbent article in Figure 1.
BEST MODE FOR CARRYING OUT THE INVENTION
Number 1 in Figure 1 indicates as a whole a flat absorbent article or underblanket in the form of a 600x650 mm rectangle. As shown in the lateral section in Figure 2, absorbent article 1 comprises a layer of absorbent material 2 enclosed between a bottom sheet 3 of material impermeable to liquid, in particular plastic material, and a top sheet 4 of porous material permeable to liquid, in particular non-woven fabric.
The layer of absorbent material 2 comprises filled portions 5, where absorbent material 2 is interposed between sheets 3 and 4; and empty portions 6, where no absorbent material 2 is interposed between sheets 3 and 4, and where sheets 3 and 4 contact each other. More specifically, the respective inner surfaces 7 and 8 of bottom sheet 3 and top sheet 4 are glued, i.e. coated with a layer of glue, so that absorbent material 2 is glued to sheets 3 and 4 at filled portions 5, and sheets 3 and 4 are glued to each other at empty portions 6.
In other words, inside absorbent article 1, sheets 3 and 4 form a number of pockets, each of which contains a respective part of absorbent material 2, defines a respective filled portion 5, and is separated from the < other pockets by empty portions 6.
As shown in Figure 1, empty portions 6 are aligned in a longitudinal direction 9 and a transverse direction 10 incident with respect to each other, so as to define a number of filled portions 5. More specifically, directions 9 and 10 are perpendicular to each other, so that each filled portion 5 is rectangular. In the Figure 1 embodiment, each filled portion 5 is 75 mm square, and each empty portion 6 is 5 mm wide, so that the filled portions 5 are obviously substantially all the same size. In an alternative embodiment not shown, filled portions 5 differ in size depending on their location within absorbent article 1.
Absorbent article 1 is in the form of a rectangle bounded by an outer edge 11/ and an annular peripheral filled portion 5a is preferably provided, extends seamlessly along the whole of outer edge 11, and surrounds the other filled portions 5. The peripheral filled portion 5a is obviously the same shape as rectangular outer edge 11, and so defines a "frame" surrounding the other filled portions 5.
As shown in Figure 3, absorbent article 1 described above is produced on an automatic machine 12, which forms the layer of absorbent material 2 comprising filled portions 5 and empty portions 6 on the peripheral surface 13 of a suction forming drum 14. More specifically, peripheral surface 13 comprises a number of projections 15 reproducing the arrangement of filled portions 5 and empty portions 6 of the layer of absorbent material 2.
From forming drum 14, the layer of absorbent material 2 is fed directly onto inner surface 8 of top sheet 4, which is fed about a feed drum 16 tangent to forming drum 14; and bottom sheet 3 is then superimposed on top sheet 4 so as to sandwich the layer of absorbent material 2 between sheets 3 and 4. Two gluing devices 17 and 18 are provided upstream from forming drum 14 to deposit respective layers of glue on inner surface 7 of bottom sheet 3 and inner surface 8 of top sheet 4.
A pressing device 19 is located downstream from forming drum 14 to press together sheets 3 and 4 enclosing the layer of absorbent material 2, by exerting opposite forces on the outer surfaces 20 and 21 of sheets 3 and 4. Pressing device 19 comprises two mutually cooperating rollers 22, between which sheets 3 and 4 enclosing the layer of absorbent material 2 are fed; and rollers 22 comprise respective mutually cooperating projections 23 corresponding with empty portions 6 of absorbent material 2. More specifically, the lateral surface 24 of each roller 2 exerts a relative pressure on filled portions 5, while projections 23 exert a relative pressure on empty portions 6. Pressing device 19 provides for exerting a different pressure on filled portions 5 from that exerted on empty portions 6, so as to ensure firm adhesion of sheets 3 and 4 at empty portions 6, while at the same time safeguarding filled portions 5 against damage by severe mechanical stress.
Downstream from pressing device 19, a known cutting station (not shown) cuts individual absorbent articles 1 off the continuous strip of articles 1 so formed.
Absorbent article 1 as described above has various advantages over conventional types. In particular, for a given surface area, the amount of absorbent material 2 required is reduced by the presence of empty portions 6. Moreover, absorbent material 2 is divided into a number of clearly defined filled portions 5, and so remains in place even after prolonged handling.

Claims

1) An absorbent article (1) comprising a layer of absorbent material (2) enclosed between two sheets (3, 4) ; the layer of absorbent material (2) comprising filled portions (5) where absorbent material (2) is interposed between the two sheets (3, 4), and empty portions (6) where no absorbent material (2) is interposed between the two sheets (3, 4) and where the two sheets (3, 4) contact each other; the absorbent article (1) being characterized in that the empty portions (β) are aligned in two directions incident with respect to each other to define a number of filled portions (5) .
2) An absorbent article (1) as claimed in Claim 1, wherein the two directions (9, 10) are perpendicular to each other; each filled portion (5) being rectangular.
3) An absorbent article (1) as claimed in Claim 2, wherein each filled portion (5) is square.
4) An absorbent article (1) as claimed in Claim 3, wherein each filled portion (5) is 75 mm square, and each empty portion (6) is 5 mm wide.
5) An absorbent article (1) as claimed in Claim 1, 2 or 3, wherein the filled portions (5) are substantially all the same size. 6) An absorbent article (1) as claimed in Claim 1, 2 or 3r wherein the filled portions (5) differ in size depending on their location within the absorbent article (D • 7) An absorbent article (1) as claimed in one of
Claims 1 to 6, and being in the form of a rectangle bounded by an outer edge (11) ; a peripheral filled portion (5a) being provided, which is annular in shape, extends seamlessly along the whole of the outer edge
(11) , and surrounds the other filled portions (5) .
.8) An absorbent article (1) as claimed in one of Claims 1 to 7, wherein the two sheets (3, 4) are permanently connected to each other at the empty portions (6) .
9) An absorbent article (1) as claimed in Claim 8, wherein the two sheets (3, 4) are glued to each other at the empty portions (6) .
10) An absorbent article (1) as claimed in one of Claims 1 to 9, wherein a first sheet (3) is made of material impermeable to liquid, and a second sheet (4) is made of porous material permeable to liquid.
11) An absorbent article (1) as claimed in Claim 10, wherein the porous material is defined by a non-woven fabric.
12) An absorbent article (1) as claimed in one of Claims 1 to 11, and being a flat absorbent article (1) known commercially as an "underblanket" .
13) An absorbent article (1) as claimed in Claim 12, and being in the form of a 600x650 mm rectangle.
14) A method of producing an absorbent article (1) comprising a layer of absorbent material (2) enclosed between two sheets (3, 4) ; the layer of absorbent material (2) comprising filled portions (5) where absorbent material (2) is interposed between the two sheets (3, 4) , and empty portions (6) where no absorbent material (2) is interposed between the two sheets (3, 4) and where the two sheets (3, 4) contact each other; the method comprising forming the layer of absorbent material
(2) comprising the filled portions (5) and the empty portions (6), gluing the inner surfaces (7, 8) of the two sheets (3, 4) , feeding the layer of absorbent material (2) between the two sheets (3, 4) , and pressing together the two sheets {3, 4) enclosing the layer of absorbent material (2) by exerting opposite forces on the outer surfaces (20, 21) of the two sheets (3, 4); the method being characterized in that the two sheets (3 , 4) enclosing the layer of absorbent material (2) are pressed by exerting different pressure on the filled portions (5) from that exerted on the empty portions (6) .
15) A method as claimed in Claim 14, wherein the two sheets (3, 4) enclosing the layer of absorbent material (2) are pressed by pressing means (19) having projections (23) corresponding with the empty portions (6) of the absorbent material (2) .
16) A method as claimed in Claim 15, wherein the pressing means (19) comprise a pair of rollers (22), at least one of which has said projections (23) corresponding with the empty portions (6) of the absorbent material (2) .
17) A method as claimed in Claim 16, wherein the lateral surface (24) of each roller (22) exerts a relative pressure on the filled portions (5) , and the projections (23) exert a relative pressure on the empty portions (6) . 18) A method as claimed in one of Claims 14 to 17, wherein the layer of absorbent material (2) comprising the filled portions (5) and the empty portions (6) is formed on the peripheral surface (13) of a suction forming drum (14) ; the peripheral surface (13) of the forming drum (14) having a number of projections (15) reproducing the arrangement of the filled portions (5) and the empty portions (6) of the layer of absorbent material (2) .
19) A method as claimed in one of Claims 14 to 18, wherein the empty portions (6) are aligned in two directions (9, 10) incident with respect to each other to define a number of filled portions (5) .
20) A method as claimed in Claim 19, wherein the two directions (9, 10) are perpendicular to each other/ each filled portion (5) being rectangular.
PCT/EP2004/051118 2003-06-16 2004-06-15 Absorbent article which includes superabsorbent material located in discrete pockets and manufacturing process WO2004110325A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO20030364 ITBO20030364A1 (en) 2003-06-16 2003-06-16 ABSORBENT ITEM WITH PADDING PRESENT FULL ZONES
ITBO2003A000364 2003-06-16

Publications (2)

Publication Number Publication Date
WO2004110325A1 true WO2004110325A1 (en) 2004-12-23
WO2004110325A8 WO2004110325A8 (en) 2005-06-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/051118 WO2004110325A1 (en) 2003-06-16 2004-06-15 Absorbent article which includes superabsorbent material located in discrete pockets and manufacturing process

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WO (1) WO2004110325A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369246B2 (en) * 2013-06-14 2019-08-06 Krp U.S., Llc Absorbent articles having pockets and related methods therefor
EP3338751B1 (en) 2011-06-10 2019-10-23 The Procter & Gamble Company Absorbent structure for absorbent articles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715918A (en) * 1985-06-26 1987-12-29 Kimberly-Clark Corporation Method for forming discrete particulate areas in a composite article
US4892535A (en) * 1987-08-07 1990-01-09 Landstingens Inkopscentral, Lic, Ekonomisk Forening Absorbent pad and method and apparatus for making the same
WO2000071790A1 (en) * 1999-05-25 2000-11-30 Bki Holding Corporation Multifunctional fibrous material with improved edge seal
US20020102392A1 (en) * 2000-12-28 2002-08-01 Kimberly-Clark Worldwide, Inc. Flexible laminate structures having enclosed discrete regions of a material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715918A (en) * 1985-06-26 1987-12-29 Kimberly-Clark Corporation Method for forming discrete particulate areas in a composite article
US4892535A (en) * 1987-08-07 1990-01-09 Landstingens Inkopscentral, Lic, Ekonomisk Forening Absorbent pad and method and apparatus for making the same
WO2000071790A1 (en) * 1999-05-25 2000-11-30 Bki Holding Corporation Multifunctional fibrous material with improved edge seal
US20020102392A1 (en) * 2000-12-28 2002-08-01 Kimberly-Clark Worldwide, Inc. Flexible laminate structures having enclosed discrete regions of a material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3338751B1 (en) 2011-06-10 2019-10-23 The Procter & Gamble Company Absorbent structure for absorbent articles
US11135105B2 (en) 2011-06-10 2021-10-05 The Procter & Gamble Company Absorbent structure for absorbent articles
US11602467B2 (en) 2011-06-10 2023-03-14 The Procter & Gamble Company Absorbent structure for absorbent articles
US11911250B2 (en) 2011-06-10 2024-02-27 The Procter & Gamble Company Absorbent structure for absorbent articles
US10369246B2 (en) * 2013-06-14 2019-08-06 Krp U.S., Llc Absorbent articles having pockets and related methods therefor
US11612674B2 (en) 2013-06-14 2023-03-28 Kpr U.S., Llc Absorbent articles having pockets and related methods therefor

Also Published As

Publication number Publication date
WO2004110325A8 (en) 2005-06-02
ITBO20030364A1 (en) 2004-12-17

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