EP0258270A1 - Procede permettant de fixer des elastiques sur des vetements - Google Patents

Procede permettant de fixer des elastiques sur des vetements

Info

Publication number
EP0258270A1
EP0258270A1 EP19870900396 EP87900396A EP0258270A1 EP 0258270 A1 EP0258270 A1 EP 0258270A1 EP 19870900396 EP19870900396 EP 19870900396 EP 87900396 A EP87900396 A EP 87900396A EP 0258270 A1 EP0258270 A1 EP 0258270A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
elastic
article
tension
ribbon
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.)
Withdrawn
Application number
EP19870900396
Other languages
German (de)
English (en)
Inventor
Thomas Richard Herrmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weyerhaeuser Co
Original Assignee
Weyerhaeuser Co
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 Weyerhaeuser Co filed Critical Weyerhaeuser Co
Publication of EP0258270A1 publication Critical patent/EP0258270A1/fr
Withdrawn legal-status Critical Current

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
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
    • A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons

Definitions

  • the present invention is a method for adhering differentially tensioned elastic to garments.
  • the method is especially well adapted for applying tensioned elastic to the leg areas of infant diapers and adult incontinent pads.
  • Elastic leg disposable undergarments have been available for considerable time prior to the above adaptation for infant diapers.
  • the following U.S. Patents can be cited as examples: Goujon et al, 3,488,778; Butter, 3,560,292; Burger, 3,694,815; and Bourgeois, 3,828,367. All of the above patents describe methods and/or apparatus for high speed application of tensioned elastic to what are essentially one-use products. In some of these cases the problem was complicated since the elastic had to be applied along a curvilinear path while being maintained under tension.
  • the elastic is applied in a straight line. This simplified the development of production equipment. However, it was desired to maintain the elastic in tension only in the crotch region of the diaper. The inventor solved this problem by applying tensioned elastic the full length of the product but bonding it only in the desired area of the crotch region. The diapers and elastic are maintained under tension until the very last stage of the manufacturing process when the individual units are severed from the continuous assembly. At this time the crotch region elastic remains bonded while a portion of the elastic ribbon that extened from the end of the bonded zone to the waist area relaxes completely and contracts so as to lie somewhere within the finished diaper.
  • Joa in U.S. Patent 4,284,454, shows a method and equipment for applying marginal elastic to diapers oriented transversely on an assembly line.
  • the present invention is a simple method of applying tensioned elastic to the leg or crotch areas of diapers or adult incontinent pads which overcomes the objections noted above.
  • the present invention is a method of attaching differentially tensioned elastic ribbon to discrete areas of an article of apparel.
  • the method involves uniformly tensioning the elastic ribbon and applying it to the article using two types of adhesive.
  • a flexible rapid setting first adhesive is used where the elastic ribbon is to remain tensioned on the finished article.
  • a relatively slower setting second adhesive composition is used where the elastic ribbon is to have relatively less or even no tension on the article.
  • the unformly tensioned ribbon is bonded to the article with the first and second adhesives. After the first adhesive has set, but before the second adhesive has done so, the external tension on the elastic ribbon is released. The ribbon is thus maintained in tension in the areas where the first rapid setting adhesive was applied but relaxes much or all of its tension in the areas to which the second adhesive is applied before the second adhesive sets.
  • the second adhesive sets to maintain the untensioned portion of elastic in a predetermined position so that it does not form unsightly "tails" within the article.
  • Figure 1 is a perspective view of a popular prior art diaper with two corners partially cut away.
  • Figure 2 is a view, similar to Figure 1, of the diaper of the present invention.
  • Figure 3 is an exploded perspective view of the present diaper during assembly.
  • Figure 4 is an exploded longitudinal cross sectional view taken along one of the elastic inserts, while the entire assembly is still held under longitudinal tension.
  • Figure 5 is a view taken along line 5-5 of Figure 2 with longitudinal tension released.
  • Figure 6 is a partial perspective view showing one method of attaching the elastic.
  • Figure 7 is a top plan view showing the adhesive bands on the article.
  • Figure 8 is a simplified side elevation of equipment suitable for carrying out the present method.
  • FIG. 1 shows a diaper which is representative of those described in the prior art.
  • the diaper shown generally at 2, consists of the usual moisture impermeable back sheet 4 and moisture permeable nonwoven top sheet 6 which form an envelope for a fluffed cellulose pad 8.
  • Thin adhesive lines 10 serve to bond the pad to the back sheet. These thin adhesive lines also serve to unite the top sheet and back sheet along the side and end margins of the diaper.
  • a pair of longitudinal elastic ribbons, generally shown at 12, 14, have central portions 16, 18 bonded to the back sheet and loose end portions 22, 24, 26, and 28. These end portions are not adhesive coated and are free to assume whatever position they may fall into when the individual diaper unit is severed and the elastic tension released. Occasionally these loose ends or tails may even extend beyond the margin of the diaper where they are unsightly and can interfere with folding and packaging machinery.
  • the diaper may also include a pair of marginally located adhesive tabs, not shown, for ease of application to an infant.
  • FIGS 2-5 show a diaper 32 of the present invention. This is constructed similarly to the one just described. It has an impermeable back sheet 34 and moisture permeable nonwoven top sheet 36 which form an envelope for a fluff pad 38. Thin adhesive lines 40, some of which are omitted in Figure 3, serve to bond the assembly together.
  • a pair of longitudinal elastic ribbons 42, 44 have bonded central portions 46, 48 and end portions 52, 54, 56, and 58. However, in the present diaper these end portions, while untensioned, remain in a parallel relationship to the longi ⁇ tudinal axis of the diaper.
  • a residual portion of the slow setting adhesive 68, 70 remains at each end of the diaper outboard from the bonded relaxed tail portions 52, 54. This residual adhesive does serve the functional purpose of improving end margin strength and integrity.
  • Figure 3 shows one method in which the diaper can be constructed. Strips of a first rapid setting adhesive 62 alternate in an end- to-end relationship with strips of a second slower setting adhesive 64, 66. As shown in this figure, both adhesives are extruded or printed on the moisture impermeable backsheet 34. During the assembly process, tensioned elastic ribbons 42, 44, are impressed against the regions of adhesive and the diaper assembly is completed, usually between at least one pair of compression rolls or belts. As the diapers proceed along the assembly conveyor in a continuous end-to-end fashion, they are kept under sufficient tension to maintain the elastic in its same elongated dimension as when it was applied. The first rapid setting adhesive will usually bond within one second or less.
  • This bonding time may be controlled if desired by passing the assembled diaper over a cold roll or similar device.
  • this first adhesive will be a hot melt which will remain flexible when cooled and have considerable tack toward polyolefins and rubber.
  • the second adhesive 66 will normally have a setting time which may be as short as several seconds or as long as several minutes.
  • This second adhesive commonly referred to as a cold set adhesive, is usually water based. Many types of compositions are suitable. Among them are starches and modified starches or synthetic resin based materials such as polyvinyl acetate emulsions.
  • the second adhesive need only have moderate bonding strength in contact with rubber or the usual polyolefin backing sheet.
  • the diapers may be severed from the continuous assembly to form individual units. At that time, the elastic will contract. In the central area of the diaper this will result in a puckering, such as seen in Figure 2.
  • the second adhesive which must not have set firmly at this time, will release its grasp on the end portions 52, 54, 56, 58, so that they contract to an untensioned or nearly untensioned state. However, these end portions are held in place by the second adhesive by viscous bonding, even though it is not fully set for an additional interval of time.
  • Figure 6 shows an alternative and presently preferred method of applying the elastic.
  • the rapid setting adhesive 62, 62' has been applied intermittently to tensioned elastic strips 42, 44.
  • the slow setting adhesive 64, 64', 66, 66' was applied in intermittent strips to the moisture impermeable backing sheet 34.
  • the adhesive application equipment is timed so that, when assembled, the two adhesive types preferably do not overlap. Some minor overlapping is in no way detrimental, however.
  • both types of adhesive could be applied to the tensioned elastic or that both types could be applied sequentially to the backing sheet.
  • one adhesive could be applied to the tensioned elastic and the other to the backing sheet.
  • the method preferred at present is to apply the rapid setting hot melt adhesive to the elastic and the slower setting adhesive to the backing sheet, as is shown in Figure 6, but the reverse order is satisfactory as well.
  • Figure 7 shows the invention in a somewhat different fashion.
  • the diaper unit is represented as if it was still held in tension but with the tension on the elastic ribbon having been released.
  • the first adhesive a rapid setting hot melt composition
  • a slower cold set adhesive was applied over the areas marked B and C.
  • the lower part of the figure shows the elastic ribbon after its external tension has been released.
  • the portion 62 bonded by the rapid setting hot melt, remains in tension.
  • End portions 64, 66 have relaxed to their unstressed state but remain in-line along the same longitudinal axis as portion 62.
  • Areas 68, 70 represent a location from which the originally applied elastic ribbon has retracted but where a thin film of the cold set second adhesive remains.
  • FIG. 8 shows a diaper assembly line, generally indicated at 70, which would be suitable for use with the present invention.
  • Spaced precut fluff pads 72 are moving in from the right hand edge of the drawing on a continuous conveyor 74. They are sandwiched between a polyethylene backing sheet 76 and a moisture pervious nonwoven top sheet 78 at the point where each component enters conveyor 80. Bonding is accomplished through press rolls 82, 84.
  • Elastic ribbon 88, held under tension, is fed under a hot melt applicator 90.
  • the spaced flow of adhesive onto the elastic ribbon may be timed by any well known conventional means. This is represented here by a cam 92 which moves the applicator head into or out of contact with the ribbon.
  • applicator timing means such as a mechanically or electrically controlled valve in the adhesive supply line
  • a cold set adhesive applicator 94 here shown out of contact with polyethylene backing film 76, is controlled by cam 96.
  • a fine line adhesive applicator 98 runs continuously against the backing sheet to lay down the thin lines of adhesive 40 which bond the pad and the top sheet to the back sheet. Finished diaper units 100, shown here as still being under tension, move down conveyor line 80 to a point where they are ultimately severed into individual units.
  • the moisture permeable top or body contacting sheet has a basis weight usually in the range of 18-26 g/m and may typically be a carded polyester fiber with a latex binder or a spun bonded polypropylene having continuous fibers of 2-5 denier thermally bonded by calendar pattern rolls. Respective examples of these types would be Scott 6822, available from Scott Paper Company, Nonwovens Division, Philadelphia, Pennsylvania or Celestra, available from Crown Zellerbach Corporation, Washougal, Washington.
  • the moisture impermeable diaper backing sheet is most usually a low density polyethylene film having a thickness in the range of 0.02-0.04 mm (0.75-1.5 mils). This material is frequently microembossed to better retain attachment tapes and may be oriented to have increased strength in the cross machine direction. An example could be Clopay Code 53, available from Clopay Corporation, Cincinnati, Ohio.
  • tissue of this type will weight about 17-22 g/m .
  • One suitable type is available from Concel, St. Helens, Oregon.
  • a number of types of cellulose pulps are suitable as fillers. These are typically high whiteness, 100% softwood pulps processed to have rapid absorbency and high liquid holding capability.
  • the elastic ribbons are most commonly natural rubber. These are typically about 0.18 mm thick by 3.2 or 6.4 mm wide. One of the wider ribbons will have a stress of about 140 g at 100% elongation and the elastic will typically have 400-600% elongation at failure and about 200% elongation at the time of application.
  • a suitable elastic ribbon is available from Fulflex, Inc., Bristol, Rhode Island. Flexible, rapid setting hot melt adhesives, used to bind the elastic in the tensioned area and also used as the fine line adhesives for uniting the assembly are commonly formulated from ethylene-vinyl acetate resins used with tackifiers and other additives.
  • adhesives tend to be somewhat tacky at room temperature and are typically applied at temperatures of about 150-205°C.
  • a suitable material is available from H. B. Fuller Company, Vadnais Heights, Minnesota as type HL 1048N.
  • a cold set adhesive having suitable properties for bonding the end portions of the elastic tape is available from Findlay Adhesives, Elm Grove, Wisconsin as type X-l 841 -381-03. This is believed to be a dextrin based material having other additives to make it suitably compatable with polyethylene. While all of the above exemplary materials are known to be satisfactory and presently in use in the manufacture of diapers and related garments, materials from many other manufacturers are fully equivalent and are equally suitable.

Landscapes

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

Abstract

Procédé permettant de fixer un ruban élastique (42, 44) à tensions différentes sur différentes parties d'un article, tel qu'une couche culotte ou une serviette absorbante pour adultes souffrant d'incontinence. Le ruban est fixé à l'article sous tension grâce à un adhésif flexible à prise rapide (62) tel qu'une matière de fusion à chaud aux endroits où le ruban restera sous tension durant l'utilisation. Les parties d'extrémité du ruban sont fixées à l'article durant l'assemblage grâce à un adhésif à prise plus lente (64, 66), tel qu'un compound de prise à froid. Celui-ci est choisi de façon à rester dans un état de prise partielle au moment ou les différentes parties sont séparées durant le procédé d'assemblage et où la tension qui tend l'élastique est relachée. Le matériau de prise à froid mantient alors toutes les parties non tendues de l'élastique en relation linéaire par rapport à l'élastique tendu fixé grâce à la matière de fusion à chaud. Ledit procédé évite que des bouts d'élastique détachés inesthétiques se voient par-ci par-là dans l'article fini.
EP19870900396 1986-01-02 1986-11-24 Procede permettant de fixer des elastiques sur des vetements Withdrawn EP0258270A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81559186A 1986-01-02 1986-01-02
US815591 1986-01-02

Publications (1)

Publication Number Publication Date
EP0258270A1 true EP0258270A1 (fr) 1988-03-09

Family

ID=25218245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900396 Withdrawn EP0258270A1 (fr) 1986-01-02 1986-11-24 Procede permettant de fixer des elastiques sur des vetements

Country Status (2)

Country Link
EP (1) EP0258270A1 (fr)
WO (1) WO1987004117A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1155668B1 (fr) 2000-05-15 2005-10-26 Kao Corporation Article absorbant
US6491776B2 (en) * 2001-04-23 2002-12-10 Bostik Findley, Inc. Dual adhesive application for laminating elastic webs
US8277430B2 (en) 2004-12-28 2012-10-02 Kimberly-Clarl Worldwide, Inc. Absorbent garment with strand coated adhesive components
CN100427053C (zh) * 2005-12-14 2008-10-22 安庆市恒昌机械制造有限责任公司 一次性卫生用品生产的橡筋包覆装置
DE102014203742A1 (de) * 2014-02-28 2015-09-03 Paul Hartmann Ag Hygieneartikel und Verfahren zum Herstellen eines Hygieneartikels

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081301A (en) * 1975-10-30 1978-03-28 The Procter & Gamble Company Method and apparatus for continuously attaching discrete, stretched elastic strands to predetermined isolated portions of disposable abosrbent products
US4413623A (en) * 1981-02-17 1983-11-08 Johnson & Johnson Baby Products Company Laminated structures having gathered and ungathered marginal portions and method of manufacturing the same
US4360398A (en) * 1981-03-09 1982-11-23 Sabee Products, Inc. Method for applying elastic bands to webs
US4634482A (en) * 1985-06-20 1987-01-06 Curt G. Joa, Inc. Method for securing elastic strands to disposable absorbent articles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8704117A1 *

Also Published As

Publication number Publication date
WO1987004117A1 (fr) 1987-07-16

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Inventor name: HERRMANN, THOMAS, RICHARD