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Method of making extensible web laminates

A technology of laminates, webs, applied in the direction of chemical instruments and methods, lamination, lamination devices, etc.

Active Publication Date: 2017-12-22
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as already mentioned above, films that are inherently stretchable in the machine direction have their own handling challenges (i.e. difficulty maintaining the film at constant tension and premature stretching in the production line)

Method used

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  • Method of making extensible web laminates
  • Method of making extensible web laminates
  • Method of making extensible web laminates

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0164] Example 1 (Laterally activated M-235)

[0165] M-235 was incrementally stretched in the transverse direction using intermeshing stretchers similar to those described in the following U.S. Patent 5,422,172: "Elastic Laminated Sheet of an Incrementally Stretched Nonwoven Fibrous Web and Elastomeric Film and Method (Incrementally Stretched Nonwoven Fibrous Web and Elastomeric Film Elastic Laminate Sheet and Process)" (Wu). The stretcher was configured to apply 224% strain to the entire multilayer film. The basis weight of activated M-235 is 35g / m 2 .

[0166] Control 2 (unactivated membrane)

[0167] A three-layer laminate film having an elastomeric core layer sandwiched between two outer skin layers was prepared using conventional coextrusion techniques. The skin layer was 5 microns thick and was made of PPH8069 resin (polypropylene available from Total Petrochemicals of Houston, Texas, USA). The core layer was 40 microns thick and consisted of 70% by weight of D...

example 2

[0168] Example 2 (transversely activated membrane)

[0169] Control 2 was stretched in the transverse direction using a diverging disc arrangement similar to that described in the following U.S. Patent 5,043,036 figure 1 Diverging disk device shown in: "Width Stretching Device (Width Stretching Device)" (Swenson). The film was stretched to 400% of its original width and then allowed to fully recover. The basis weight of activated Example 2 was 50 gsm.

[0170] Control 3 (unactivated membrane)

[0171] A three-layer laminate film having an elastomeric core layer sandwiched between two outer skin layers was prepared using conventional coextrusion techniques. The surface layer is made of PPH8069 resin. The core layer was made from a blend of 95% by weight D1114 and 5% EMPERA 124N. Basis weight is 45gsm. The core / surface ratio is 4.1:1.

example 3

[0172] Example 3A (transversely activated membrane)

[0173] Control 3 was incrementally stretched in the cross direction using the process described in Example 1. The stretching machine was configured to apply a local strain of 117%. The activated Example 3A had a basis weight of 42 gsm.

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Abstract

A method of making extensible web laminates comprising a multilayer film and at least one web layer and the use of such extensible web laminates in personal care articles. The method generally includes activating the multilayer film in a first direction by stretching at least a portion of the multilayer film past the elastic deformation limit of the skin layers and recovering the skin layers with the elastomeric core layer to produce a multilayer film that is elastic in the first direction. The activated multilayer film is subsequently stretched beyond the deformation limit of the skin layers in a second direction substantially perpendicular to the first direction. At least one web layer is applied to the multilayer film while in the stretched state. The multilayer film is then recovered to produce an extensible web laminate.

Description

technical field [0001] The present invention relates to a method of making an extensible web laminate comprising a multilayer film and at least one web layer. The present invention also relates to the use of such extensible web laminates in personal care articles such as diapers, training pants, adult incontinence devices, baby hosiery and garments. Background technique [0002] Elastic films are often incorporated into personal care products to allow the product to better conform to the contours of the body. Elastic films can be used, for example, in the waist and leg regions of diapers, the side panels of training pants, and the cuffs of disposable gowns. Often one or more web layers, such as nonwoven layers, are applied to the elastic films to make them more like textiles. Typically, a nonwoven layer is bonded to an elastic film in a stretched state. When the elastic film is allowed to recover, the nonwoven layer tightens or tensions to form a nonwoven laminate that is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B37/00B32B39/00B32B27/12B29C55/10
Inventor 玛莉·贝丝·亨克丽贝卡·A·希普曼杰拉尔德·S·迪比肯特·R·舍恩赫尔托德·L·纳尔逊威廉·H·小西科尔斯基瓦莎拉·拉贾戈帕尔托马斯·P·汉施恩马克·A·佩尔蒂埃
Owner 3M INNOVATIVE PROPERTIES CO
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