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WO2007111990A2 - Procédé et dispositif de formation d'une âme absorbante - Google Patents

Procédé et dispositif de formation d'une âme absorbante Download PDF

Info

Publication number
WO2007111990A2
WO2007111990A2 PCT/US2007/007222 US2007007222W WO2007111990A2 WO 2007111990 A2 WO2007111990 A2 WO 2007111990A2 US 2007007222 W US2007007222 W US 2007007222W WO 2007111990 A2 WO2007111990 A2 WO 2007111990A2
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent core
core composite
absorbent
tow
composite
Prior art date
Application number
PCT/US2007/007222
Other languages
English (en)
Other versions
WO2007111990A3 (fr
Inventor
John J. Walter
John D. Litvay
Original Assignee
Walter John J
Litvay John D
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 Walter John J, Litvay John D filed Critical Walter John J
Publication of WO2007111990A2 publication Critical patent/WO2007111990A2/fr
Publication of WO2007111990A3 publication Critical patent/WO2007111990A3/fr

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
    • 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
    • A61F2013/530481—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 superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530569—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 superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the particle size

Definitions

  • the present invention relates generally to a system and a method for manufacturing absorbent cores. More specifically, the present invention relates to a system and a method for forming tow-based absorbent cores.
  • disposable absorbent garments such as infant diapers, training pants, adult incontinence products, feminine hygiene products and other such products are constructed with a moisture-impervious outer backsheet, a moisture-pervious body- contacting inner topsheet, and an absorbent core sandwiched between the topsheet and the backsheet.
  • the absorbent cores are made from absorbent core composites, and the integrated to absorbent garments.
  • particles of superabsorbent particulates (SAP) are distributed within the absorbent core composites comprising a fibrous web of fluffed pulp material, tow fiber and the like.
  • SAP superabsorbent particulates
  • the introduction of tow fiber into the absorbent core composites has further improved liquid absorbency and liquid retention capacity of the absorbent core composites.
  • These absorbent core composites have improved SAP efficiency and higher density.
  • higher density of tow fibers result into thinner absorbent core composites.
  • Such absorbent cores are disclosed, for example, in U.S. Statutory Invention Registration No. H 1,565 to Brodof et al., which is incorporated by reference herein in its entirety and in a manner consistent with the present invention.
  • known processes for creating a conventional tow-based absorbent core composite use a large forming apparatus to blend the SAP with the tow fiber, and then convey this blend onto a vacuum draw roll or screen by using a vacuum.
  • One or more casing sheets are supplied to encase the blend of SAP and tow fiber.
  • the vacuum draw roll has forming pockets that form the absorbent core composites.
  • an absorbent core has been made by crimping and cutting of an absorbent core composite. Before cutting, the absorbent core composite is compressed using one or more calender rolls. Since, the calender roll assemblies are normally about 2 meters in length, therefore, almost about 2 meters of absorbent core composite is held by the calender rolls. Each time the manufacturing line of absorbent core composite is shutdown for any reasons, about 2 meters of absorbent core composite is wasted before restarting of the manufacturing line. Even, the presence of calender rolls increases the size, weight, and cost of manufacturing line or manufacturing unit of the absorbent core composite or absorbent core. Therefore, there exits a need to modify the manufacturing line in order to prevent the wastage of absorbent core composite, reduce the cost of absorbent core, and to reduce the size, weight and cost of manufacturing line or unit.
  • the present invention provides an apparatus and a method of making an absorbent core.
  • the apparatus comprises a cutting device for cutting an absorbent core composite.
  • the absorbent core composite comprises tow fiber.
  • the absorbent core composite is cut into one or more absorbent cores.
  • the apparatus excludes one or more calender rolls, wherein, each of the one or more calender rolls is used for compressing the absorbent core composite.
  • FIG. 1 illustrates a prior art apparatus for making an absorbent core.
  • FIG. 2 illustrates an apparatus for making an absorbent core according to various embodiments of the present invention.
  • absorbent garment refers to garments that absorb and contain exudates, and more specifically, refers to' garments that are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body.
  • absorbent garments includes diapers, diaper covers, disposable diapers, training pants, feminine hygiene products and adult incontinence products.
  • garment includes all variations of absorbent garments, including disposable absorbent garments that are intended to be discarded or partially discarded after a single use (i.e., they are not intended to be laundered or otherwise restored or reused) and unitary disposable absorbent garments that have essentially a single structure (i.e., do not require separate manipulative parts such as a diaper cover and insert).
  • disposable absorbent garments that are intended to be discarded or partially discarded after a single use (i.e., they are not intended to be laundered or otherwise restored or reused) and unitary disposable absorbent garments that have essentially a single structure (i.e., do not require separate manipulative parts such as a diaper cover and insert).
  • diaper refers to an absorbent garment generally worn by infants and incontinent persons about the lower torso.
  • the claims are intended to cover all of the foregoing classes of absorbent garments, without limitation, whether disposable, unitary or otherwise.
  • absorbent structure may comprise an absorbent core, whether described herein or not.
  • Absorbent garments and diapers may have a number of different constructions. In each of these constructions it is generally the case that an absorbent core is disposed between a liquid pervious, body-facing topsheet, and a liquid impervious, exterior facing backsheet. In some cases, one or both of the topsheet and backsheet may be shaped to form a pant-like garment. In other cases, the topsheet, backsheet and absorbent core may be formed as a discrete assembly that is placed on a main chassis layer and the chassis layer is shaped to form a pant-like garment.
  • the garment may be provided to the consumer in the fully assembled pant-like shape, or may be partially pant-like and require the consumer to take the final steps necessary to form the final pant-like shape.
  • the garment is provided fully formed with factory-made side seams and the garment is donned by pulling it up the wearer's legs.
  • the present invention is described herein only with reference to a diaper-type garment in which the topsheet, backsheet and absorbent core are assembled into a structure that forms a pant-like garment when secured on a wearer using fastening devices, although the invention may be used with other constructions.
  • the expression "tow fibers” relates in general to any continuous fiber.
  • suitable tow fibers includes among others cellulose esters, polyolefin, polypropylene, and the like.
  • FIG. 1 illustrates a prior art apparatus 100 used for making one or more absorbent cores.
  • Prior art apparatus 100 comprises a forming apparatus 102, a set of calender rolls 1 10, a crimping device 1 12, and a cutting device 114.
  • Forming apparatus 102 is used to make an absorbent core composite 148.
  • Forming apparatus 102 comprises, a tow supply 120, a tow jet assembly 122, a vibratory feeder 124, a first casing sheet supply 126, a second casing sheet supply 128, and a vacuum draw roll 130.
  • the tow supply 120 is provided along a first path to tow jet assembly 122.
  • the tow supply 120 enters the tow jet assembly 122 and is opened in preparation for being incorporated into the absorbent cores composite 148. Air or other gas are projected into the tow jet assembly 122 to impinge upon the tow fiber to thereby separate the fibers and "bloom" or open the tow fiber.
  • Such forming apparatus are disclosed, for example, in U.S. Patent No. 6, 923,926 to J. Walter et al., which is incorporated by reference herein in its entirety and in a manner consistent with the present invention.
  • vibratory feeder 124 delivers superabsorbent particles to the opened tow, and the tow/SAP composite is encased between the first casing sheet supply 126 and second casing sheet supply 128.
  • the tow/SAP composite is also encased within a fold in a single casing sheet.
  • the opened tow is laid onto first casing sheet supply 126 before the SAP is fed to the opened tow, then the second casing sheet supply 128 is laid on the tow/SAP composite to form absorbent core composite 148 .
  • the absorbent core composite 148 is assembled in four steps that take place as the various parts of the forming apparatus 102 are pulled onto the rotating vacuum draw roll 130.
  • the first casing sheet supply 126 is drawn onto the vacuum draw roll 130.
  • the opened tow is drawn onto the vacuum draw roll 130 to overlay the first casing sheet supply 126 after being pulled out of the tow jet assembly 122.
  • a supply of SAP is deposited onto the opened tow by the vibratory feeder 124.
  • the second casing sheet supply 128 is brought in to overlie the first casing sheet supply 126, and deposited tow/SAP composite.
  • these steps are performed using equipment other than that specifically described herein, and also performed in various different orders, with some of the steps being rearranged, omitted or combined, or with additional steps being performed.
  • a lay on roll 140 is used to press the second casing sheet supply 128 against the tow/SAP composite and the first casing sheet supply 126.
  • the lay on roll 140 helps flatten the absorbent core composite 148 and improves the edge seals between the first and second casing sheet supplies 126, 128.
  • the absorbent core composite 148 made from forming apparatus 102 is cut into one or more absorbent cores. More particularly, absorbent core composite 148 is fed into set of calender rolls 1 10 before cutting. Set of calender rolls 1 10 compresses absorbent core composite 148 in order to make a thinner absorbent core composite. The thinner absorbent core composite results into thinner absorbent cores. Normally, set of calender rolls 110 is about 2 meters of length. Thus, a portion of absorbent core composite 148 of about 2 meters length is held by set of calender rolls 1 10 during manufacturing process. During this manufacturing process, whenever, manufacturing line is shutdown and restarted, the portion of absorbent core composite 148 held by the set of calender rolls 1 10 goes as waste.
  • absorbent core composite 148 is also fed into crimping device 112 before cutting into one or more absorbent cores. Crimping device 112 generates patterns on absorbent core composite 148. Then, absorbent core composite 148 is cut into one or more absorbent cores using cutting device 1 14.
  • the prior art apparatus 100 has been in practice since very long.
  • set of calender rolls 110 are effective only when absorbent core composite comprises discontinuous fibers such as wood pulp, fluff fibers, and the like. Since the discontinuous fibers have relatively lesser density, application of set of calender rolls 1 10 increases density of absorbent core composite resulting into a thinner absorbent core composite.
  • tow fibers are continuous fibers having higher density compared to discontinuous fibers such as wood pulp, fluff fibers, and the like. Moreover, the density of tow fibers does not change by compressing from set of calender rolls 110. Therefore, the thickness of an absorbent core composite comprising tow fibers does not change even after the compression by set of calender rolls 110.
  • FIG. 2 illustrates an apparatus 200 for making one or more absorbent core.
  • Apparatus 200 comprises forming apparatus 102, crimping device 1 12, and cutting device 114.
  • apparatus 200 excludes set of calender rolls 110 (as shown in fig. 1).
  • Absorbent core composite 148 is made from forming apparatus 102.
  • absorbent core composite 148 comprises tow fibers.
  • Preferable examples of tow fibers include among others cellulose esters, polyolefin, polypropylene, and the like. Since, set of calender rolls 110 is excluded from the apparatus 200, absorbent core composite 148 is directly fed into crimping device 112.
  • a step of compressing of absorbent core composite 148 is eliminated.
  • Crimping device 112 generates patterns on absorbent core composite 148.
  • absorbent core composite 148 is fed into cutting device 114 to cut into one or more absorbent cores.
  • absorbent core composite 148 may directly be fed into cutting device 114 without crimping.
  • cutting device 114 may further comprise a crimping device.
  • the crimping device firstly creates patterns on absorbent core composite 148.
  • absorbent core composite 148 is cut into one or more absorbent cores. It will be recognized within the scope of the present invention that absorbent core composite 148 may also be made by various different apparatus and different methods known in the art.
  • the absorbent core made from apparatus 200 may be used in construction of absorbent garment as discussed previously. Apparatus 200 has various advantages over prior art apparatus 100. Each time, apparatus 200 is shutdown and restarted, about 2 meters of length of absorbent core composite is saved. Size and weight of apparatus 200 is less than size and weight of prior art apparatus 100. Consequently the cost of apparatus 200 is less than the cost of apparatus 100. Even the cost of absorbent garment decreases as the wastage of absorbent core composite is reduced.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

L'invention concerne un dispositif et un procédé de fabrication d'une âme absorbante à partir d'un composite à âme absorbante à base d'étoupe. Le composite à âme absorbante à base d'étoupe est obtenu au moyen d'un dispositif de formage, selon un procédé qui consiste à : introduire le composite à âme absorbante à base d'étoupe dans un dispositif d'ondulation; produire un motif sur le composite à âme absorbante à base d'étoupe au moyen du dispositif d'ondulation; et découper l'âme absorbante à base d'étoupe en de multiples âmes absorbantes à l'aide d'un dispositif de coupe. Le procédé exclut l'usage d'un ensemble de cylindres de calandre utilisés pour compresser le composite à âme à base d'étoupe. Le procédé est caractérisé en ce qu'il dispense de l'usage de l'ensemble de cylindres de calandre utilisés pour compresser le composite à âme absorbante à base d'étoupe.
PCT/US2007/007222 2006-03-24 2007-03-24 Procédé et dispositif de formation d'une âme absorbante WO2007111990A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78545506P 2006-03-24 2006-03-24
US60/785,455 2006-03-24

Publications (2)

Publication Number Publication Date
WO2007111990A2 true WO2007111990A2 (fr) 2007-10-04
WO2007111990A3 WO2007111990A3 (fr) 2008-04-24

Family

ID=38541627

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2007/006866 WO2007111872A2 (fr) 2006-03-24 2007-03-20 Produit absorbant contenant de la poudre sap
PCT/US2007/007222 WO2007111990A2 (fr) 2006-03-24 2007-03-24 Procédé et dispositif de formation d'une âme absorbante

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2007/006866 WO2007111872A2 (fr) 2006-03-24 2007-03-20 Produit absorbant contenant de la poudre sap

Country Status (1)

Country Link
WO (2) WO2007111872A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120062687A1 (en) * 2010-09-13 2012-03-15 Polycom, Inc. Systems and methods for scheduling shared program content videoconferencing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2078477T3 (pl) * 2008-01-14 2012-02-29 Recticel Konstrukcja podtrzymująca ciało
CN111249069A (zh) * 2020-02-29 2020-06-09 浙江振宇吸水材料有限公司 一种无胶逆向吸收的吸水芯体及其制备工艺

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6923926B2 (en) * 2002-01-16 2005-08-02 Paragon Trade Brands, Inc. Method and apparatus for forming tow-based absorbent structures with a single casing sheet
US20040102125A1 (en) * 2002-11-27 2004-05-27 Morman Michael Tod Extensible laminate of nonwoven and elastomeric materials and process for making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120062687A1 (en) * 2010-09-13 2012-03-15 Polycom, Inc. Systems and methods for scheduling shared program content videoconferencing

Also Published As

Publication number Publication date
WO2007111872A2 (fr) 2007-10-04
WO2007111990A3 (fr) 2008-04-24

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