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Method of producing low cost elastic web

a nonwoven web and low cost technology, applied in the field of activation of nonwoven webs, laminates, composites, can solve the problems of limited use as textiles, inelastic nature of some nonwoven webs, and use of nonwoven fabrics, and achieve the effect of superior mechanical properties

Inactive Publication Date: 2006-03-23
TREDEGAR FILM PROD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In a further embodiment, an activated nonwoven web, laminate, or composite thereof is provided, whereby the material is produced by elongating the nonwoven web, laminate, or composite thereof precursor material a first time to provide a first elongated material, and then elongating the first elongated material a second time in substantially the same direction and to substantially the same degree as the first time. The nonwoven web, laminate, or composite thereof may possess superior mechanical properties compared to webs activated by other methods.

Problems solved by technology

One obstacle to the use of nonwoven fabrics has been the relatively inelastic nature of some nonwoven webs.
Inelastic fabric often is rough and uncomfortable and therefore of limited utility as a textile.
One of the disadvantages of activation of nonwoven webs and laminates or composites thereof is that the process is destructive of the structure of the nonwoven web.
This may necessitate use of a high quality and expensive precursor nonwoven web in order to maintain a viable structure in the activated product.

Method used

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  • Method of producing low cost elastic web
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Examples

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Effect test

example

[0062] Samples of nonwoven (Sofspan® 200 supplied by BBA Nonwovens, One Lakeview Place—Suite 204, Nashville, Tenn. 37124 USA) and elastomeric formed film (Flexaire®, 40 gsm supplied by Tredegar Film Products, 1100 Boulders Parkway, Richmond, Va. 23225 USA) were vacuum bonded and activated between a pair a finned rollers produced by BIAX Fiberfilm (Biax-Fiberfilm Corporation, N992 Quality Drive, Suite B, Greenville, Wis. 54942 USA). The activation pattern as indicated in the tables refers to the depth of engagement of the teeth of the gear rollers. This is the maximum depth at which the ribs, grooves, or teeth of one activation roller penetrate between the ribs, grooves, or teeth of the opposing activation roller. For example, a 200 activation depth refers to a laminate being activated once, and to a depth of 200 mils (thousandths of an inch). A 200 / 200 pattern refers to a laminate being activated twice, to depths of 200 mils each time.

[0063] Samples with a gauge length of 2 inches ...

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Abstract

A method for producing nonwoven webs, laminates, and composites thereof includes activating by elongation in at least a two-stage process wherein the first elongation is in substantially the same direction and to substantially the same degree as the second elongation.

Description

FIELD OF THE INVENTION [0001] Embodiments relate generally to methods for activating nonwoven webs, laminates, and composites thereof. More particularly, embodiments relate to the activation of nonwoven webs, laminates, and composites thereof for use in, for example, diapers, articles for the control of the effects of incontinence, bandages, and other hygiene articles. BACKGROUND OF THE INVENTION [0002] Nonwoven fabrics, especially inexpensive polymer-based nonwoven fabrics, have found increasing use in the textile market. Nonwoven fabrics typically are webs, batts, mats, sheets, or films of fiber networks. They are commonly referred to simply as “nonwoven webs” or “webs.” Many different natural, synthetic, and semi-synthetic polymer fibers are used to create nonwoven webs. Nonwoven webs may consist of one type of fiber, several different types of fibers, laminates of different fibers, and composites. The fibers may be staple (short fibers) or filaments (long fibers). Nonwoven webs ...

Claims

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Application Information

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IPC IPC(8): D04H5/00D04H13/00D04H1/00
CPCD06C3/00Y10T442/69Y10T442/60Y10T442/601B32B5/26B32B27/12D04H1/42D04H13/00D06C3/06D10B2509/026B32B2250/20
Inventor CHUNG, TZE WAN PANSYMIDDLESWORTH, JEFFREY ALAN
Owner TREDEGAR FILM PROD CORP
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