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Elastic film laminates prepared by multiple stretching steps

A technology for elastic films and laminates, applied in the directions of lamination, lamination equipment, lamination auxiliary operations, etc., can solve the problems of complex, difficult to control fibers, unstable manufacturing process, etc.

Inactive Publication Date: 2007-11-28
TREDEGAR FILM PROD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increased number of elastic fibers increases the cost of the laminate and also results in a more complex and less robust manufacturing process
Added fibers become more difficult to control, and if any fibers break, the manufacturing process needs to be stopped for a considerable period of time until the fibers are stretched back into the machine

Method used

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  • Elastic film laminates prepared by multiple stretching steps
  • Elastic film laminates prepared by multiple stretching steps
  • Elastic film laminates prepared by multiple stretching steps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Table 1 shows the reduction in force required to elongate the film between the first and second stretching steps for two films that were identical except for the basis weight. Because less force is required to elongate the films after the first stretching step, they also require less force to hold the films in tension (ie, they also have reduced restoring forces).

[0046] In this example, two films were prepared, one with 30 g / m 2 ("gsm") basis weight and the other has a basis weight of 40gsm. The film was first stretched to 400% elongation (reported as "pre-stretch" in Table 1) and relaxed. Next, in a second stretching step, the film was stretched to 300% elongation (reported as "first cycle" in Table 1). Table 1 reports the force required to stretch the film.

Basis weight

Pre-stretch (400%)

First cycle (300%)

force reduction

30gsm

1676grams

930gram

44.5％

40gsm

2200gram

1331gram

39.5％

[0048] ...

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PUM

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Abstract

Elastic laminates and methods of making same are provided, wherein the laminate includes an elastic film laminated to at least one substrate web, and wherein the elastic film has been stretched at least twice prior to bonding the film to the substrate layer. Such laminates possess improved bond strength between the film and the substrate web and have greater elongation versus laminates made with a film that has been stretched only once.

Description

[0001] Cross References to Related Applications [0001] This application claims the benefit of US Provisional Application No. 60 / 790,663, entitled "Elastic Film Laminates, Articles and Methods of Manufacturing Same," filed April 10, 2006. technical field [0002] This invention relates to elastic film laminates, methods of making such laminates and articles incorporating such laminates. Background technique [0003] Elastic film laminates are used to make a variety of articles. In particular, elastic film laminates are used to make absorbent articles such as diapers, training pants, adult incontinence products, and the like. The elastic film laminate can be used, for example, as a waistband, leg cuffs, side tabs, side ears, side panels or as a shell for an article. Elastic film laminates can also be used in other articles, such as garments, hats, gowns, coveralls, etc., and often also to provide a fit feature to the article. [0004] When making a film or laminate in rol...

Claims

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Application Information

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IPC IPC(8): B32B5/00B32B3/24B32B37/02B32B38/12B32B38/04B29C55/02
Inventor J・A・米德尔斯沃斯S・D・布鲁斯
Owner TREDEGAR FILM PROD CORP