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WO1997018346A1 - Non tisse elastique - Google Patents

Non tisse elastique Download PDF

Info

Publication number
WO1997018346A1
WO1997018346A1 PCT/US1996/016916 US9616916W WO9718346A1 WO 1997018346 A1 WO1997018346 A1 WO 1997018346A1 US 9616916 W US9616916 W US 9616916W WO 9718346 A1 WO9718346 A1 WO 9718346A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibers
bonding
web
pascals
fibrous nonwoven
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.)
Ceased
Application number
PCT/US1996/016916
Other languages
English (en)
Inventor
Clifford Jackson Ellis
John Wallace Bruce
Nancy Jane Zimmerman
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.)
Kimberly Clark Worldwide Inc
Kimberly Clark Corp
Original Assignee
Kimberly Clark Worldwide Inc
Kimberly Clark Corp
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 Kimberly Clark Worldwide Inc, Kimberly Clark Corp filed Critical Kimberly Clark Worldwide Inc
Priority to AU74661/96A priority Critical patent/AU7466196A/en
Publication of WO1997018346A1 publication Critical patent/WO1997018346A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving

Definitions

  • thermo-mechanical bonding In this bonding method heat and pressure are used to bond the fibers of the nonwoven web together.
  • One version of this method involves using a heat source to heat at least a portion of the fibers, typically to a temperature close to their melting or softening point, and then applying pressure to the web by some type of mechanical means as with a smooth or patterned bonding roll or rolls.
  • the heating source may be incorporated into the bonding rolls so that the heating and compaction of the fibers is accomplished all in one step.
  • thermo- mechanical bonding creates areas of high density and low loft due to the compaction and fusing of the fibers to one another in the areas of the bond sites.
  • This bonding technique is often used for fibers such as polyolefin fibers or blends of polyolefin fibers and other fibers such as polyester fibers.
  • this lower melting or softening point polymer will usually be one of the lowest if not the lowest melting/softening point polymers in the entire web matrix.
  • fibers include, for example, bicomponent and biconstituent fibers. These fibers are formed from multiple polymer compositions which are generally processed through separate extruders and combined to form a single fiber.
  • Bicomponent fibers may have, for example, a lower melting sheath such as polyethylene and a higher melting core such as polypropylene or polyester.
  • Another example of a bicomponent sheath/core fiber is a polyester/polyester fiber wherein the polymer composition of the sheath is different from the polymer composition of the core. When heated sufficiently, the lower melting sheath acts, in essence, like a glue to bond the fibers of the web together.
  • Such bicomponent fibers are commonly used alone or in combination with other fibers when forming through air bonded fibrous webs.
  • the polymer composition of the bonding and support fibers should be chosen such that the bonding fibers have a lower bonding temperature than the support fibers.
  • Suitable fiber polymers include, but are not limited to, polyolefins and polyesters.
  • Formation of the fibrous nonwoven web involves mixing together appropriate weight percent quantities of bonding and support fibers and then heating the bonding and support fibers to the bonding temperature of the bonding fibers but below the bonding temperature of the support fibers for a sufficient amount of time to cause the bonding fibers to bond together and yield a fibrous nonwoven web with the prescribed properties set forth herein.
  • Through air bonding is a particularly advantageous method for bringing about such bonding.
  • Figure 3 is a graph which plots the weight percent of bonding fibers in the fibrous nonwoven webs of Examples 28 through 33 versus the density of the same webs.
  • Bonded carded webs are made from staple fibers which are usually purchased in bales. The bales are placed in a picker which separates the fibers. Next, the fibers are sent through a combing or carding unit which further breaks apart and aligns the staple fibers in the machine direction so as to form a machine direction-oriented fibrous nonwoven web. Once the web has been formed, it is then bonded by one or more of several bonding methods.
  • One bonding method is powder bonding wherein a powdered adhesive is distributed through the web and then activated, usually by heating the web and adhesive.
  • the fibers of the, as yet, unbonded web should be heated to the bonding temperature of the bonding fibers but below the bonding temperature of the support fibers.
  • certain polymers are semi-crystalline in nature and, therefore, while still having a differential scanning calorimetry (DSC) melting point, will also be sufficiently soft below this temperature so as to be able to bring about interfiber bonding between the crossover points of the bonding fibers.
  • the "bonding temperature” will typically be a temperature obtained by the bonding fiber polymer, at least at its surface, that is within the softening temperature range of the bonding polymer but less than or equal to the DSC melting point of the same polymer.
  • a p area of the platen in square centimeters (19.02 cm 2 )
  • a 4.92 centimeter diameter circular platen was used to compress materials against the fixed base at a rate of 5.00 mm/minute up to a maximum load of 13,790 pascals (2.0 psi). The platen was then returned at the same rate to the initial starting position. The initial starting position for the platen was 13 millimeters from the base. Material samples were cut to 10.16 centimeter square shapes and tested in the center of the samples. Force and position data were recorded every 0.01 minutes or every 0.5 millimeters. Three samples were run for each material and averaged. The values reported are for the averages. The same was also true for bulk recovery values.
  • SA/VV can be thought of as being similar to the mesh size of a screen. A large SA/VV means that the wires of the screen are closer together thus making the holes in the screen smaller. As the holes get smaller, it becomes more difficult for liquid to pass through the screen. For purposes of the present invention it is desirable to generate webs with low SA/VV values so that liquid can pass through the web with relative ease.
  • the data generated in conjunction with the Examples was based upon an average of three samples per Example.
  • fiber 1 and fiber 2 are the support and bonding fibers respectively or vice versa. If more than two fibers are used, the equations can be expanded. This calculation assumes cylindrical fibers and that the web is at 100% saturation. To demonstrate the use of the above equations, the permeability value was calculated for the web generated in
  • Example 24 a 151.2 gsm web was made from a uniformly mixed blend of 60 weight percent 3.0 denier polyethylene sheath/polypropylene core fibers and 40 weight percent 6.0 denier polyester fibers. The web was bonded in a through air dryer at a line speed of 53 meters per minute at a temperature of 130°C and at an air flow hood pressure of 448 pascals. The dwell time within the dryer per unit area of web material was 4.1 seconds.
  • Example 32 a 110.9 gsm web was made from a uniformly mixed blend of 90 weight percent 2.2 denier polypropylene fibers and 10 weight percent 6.0 denier polyester fibers. The web was bonded in a through air dryer at a line speed of 61 meters per minute at a temperature of 147°C and at an air flow hood pressure of 622 pascals. The dwell time within the dryer per unit area of web material was. 3.6 seconds. The resultant web had a bulk at 68.9 pascals of 2.36 mm, a bulk recovery of 88.2 percent, a density of
  • Example 34 a 53.2 gsm web was made from a uniformly mixed blend of 60 weight percent 2.8 denier (21.0 micron diameter) by 38 millimeter long Type-182 Red 516 polypropylene staple fibers from Hercules Incorporated and 40 weight percent 6.0 denier polyester fibers.
  • the polyester fibers were the same as the polyester fibers used in the other examples.
  • the polypropylene staple fibers had a uniform polymer composition along both their length and width but had not been oxidized on their exterior surfaces as with the polypropylene fibers in the previous examples thus demonstrating that the phenomenon of the present invention is not specific to a single polyolefin fiber.
  • Example 35 a 56.3 gsm web was made from a uniformly mixed blend of 60 weight percent 2.8 denier (21.0 micron diameter) by 38 millimeter long Type-182 Blue 206 polypropylene staple fibers from Hercules Incorporated and 40 weight percent 6.0 denier polyester fibers.
  • the polyester fibers were the same as the polyester fibers used in the other examples.
  • the polypropylene staple fibers had a uniform polymer composition along both their length and width but had not been oxidized on their exterior surfaces as with the polypropylene fibers in the previous examples thus demonstrating that the phenomenon of the present invention is not specific to a single polyolefin fiber.
  • Figure 5 shows MD tensile strength as a function of bonding fiber content.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne une bande en non tissé fibreux fabriqué en fibres de liage et en fibres de support. Les fibres de liage sont obtenues à partir d'une composition polymère homogène à la fois sur la longueur et sur la largeur de la fibre de liage. Cette fibre de liage présente également une température de liage inférieure à celle de la fibre de support. Ce non tissé fibreux comprenant ces deux fibres est conçu pour être lié au moyen de procédés de liage, par exemple par passage d'air à travers les fibres, ce qui ne comprime pas exagérément la bande liée obtenue. Les fibres de liage appropriées comprennent, par exemple, des fibres de polyoléfines, telles que des fibres de polypropylène plus économiques que les fibres à deux constituants, par exemple. On peut obtenir, de ce fait, des bandes de non tissés fibreux économiques pouvant être utilisées dans des articles jetables ou à usage limité, tels que des articles hygiéniques absorbants, des articles jetables d'habillement ou de chirurgie et des articles de salle blanche, tels que des champs pour la chirurgie ou des bandes de stérilisation.
PCT/US1996/016916 1995-11-13 1996-10-22 Non tisse elastique Ceased WO1997018346A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74661/96A AU7466196A (en) 1995-11-13 1996-10-22 Lofty nonwoven fabric

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55667895A 1995-11-13 1995-11-13
US08/556,678 1995-11-13

Publications (1)

Publication Number Publication Date
WO1997018346A1 true WO1997018346A1 (fr) 1997-05-22

Family

ID=24222380

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/016916 Ceased WO1997018346A1 (fr) 1995-11-13 1996-10-22 Non tisse elastique

Country Status (4)

Country Link
AR (1) AR004578A1 (fr)
AU (1) AU7466196A (fr)
WO (1) WO1997018346A1 (fr)
ZA (1) ZA969289B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6235137B1 (en) 1998-08-06 2001-05-22 Kimberly-Clark Worldwide, Inc. Process for manufacturing an elastic article
US6248097B1 (en) 1998-08-06 2001-06-19 Kimberly-Clark Worldwide, Inc. Absorbent article with more conformable elastics
US6361634B1 (en) 2000-04-05 2002-03-26 Kimberly-Clark Worldwide, Inc. Multiple stage coating of elastic strands with adhesive
USH2062H1 (en) 1998-09-03 2003-04-01 Kimberly-Clark Worldwide Nursing pad
US6652693B2 (en) 1998-08-06 2003-11-25 Kimberly-Clark Worldwide, Inc. Process for applying adhesive in an article having a strand material
US6815383B1 (en) 2000-05-24 2004-11-09 Kimberly-Clark Worldwide, Inc. Filtration medium with enhanced particle holding characteristics

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070163A2 (fr) * 1981-07-10 1983-01-19 Chicopee Tissu non tissé composé de fibres conjuguées polyester/polyéthylène
US4488928A (en) * 1983-05-16 1984-12-18 Kimberly-Clark Corporation Method and apparatus for forming soft, bulky absorbent webs and resulting product
EP0672774A2 (fr) * 1994-03-04 1995-09-20 Kimberly-Clark Corporation Nappe non-tissée avec contrôle de l'écoulement de liquide améliorée pour articles de soins et similaires

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070163A2 (fr) * 1981-07-10 1983-01-19 Chicopee Tissu non tissé composé de fibres conjuguées polyester/polyéthylène
US4488928A (en) * 1983-05-16 1984-12-18 Kimberly-Clark Corporation Method and apparatus for forming soft, bulky absorbent webs and resulting product
EP0672774A2 (fr) * 1994-03-04 1995-09-20 Kimberly-Clark Corporation Nappe non-tissée avec contrôle de l'écoulement de liquide améliorée pour articles de soins et similaires

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6235137B1 (en) 1998-08-06 2001-05-22 Kimberly-Clark Worldwide, Inc. Process for manufacturing an elastic article
US6248097B1 (en) 1998-08-06 2001-06-19 Kimberly-Clark Worldwide, Inc. Absorbent article with more conformable elastics
US6652693B2 (en) 1998-08-06 2003-11-25 Kimberly-Clark Worldwide, Inc. Process for applying adhesive in an article having a strand material
USH2062H1 (en) 1998-09-03 2003-04-01 Kimberly-Clark Worldwide Nursing pad
US6361634B1 (en) 2000-04-05 2002-03-26 Kimberly-Clark Worldwide, Inc. Multiple stage coating of elastic strands with adhesive
US6815383B1 (en) 2000-05-24 2004-11-09 Kimberly-Clark Worldwide, Inc. Filtration medium with enhanced particle holding characteristics

Also Published As

Publication number Publication date
AR004578A1 (es) 1998-12-16
ZA969289B (en) 1997-06-02
AU7466196A (en) 1997-06-05

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