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Method of making a structured surface and article therefrom

A structured surface, thermoplastic technology for overhangs and initial shapes to solve problems such as separation, low peel strength, etc.

Active Publication Date: 2013-02-27
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And in some cases, low peel strength can lead to inadvertent separation of the fastening members while the diaper is being worn

Method used

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  • Method of making a structured surface and article therefrom
  • Method of making a structured surface and article therefrom
  • Method of making a structured surface and article therefrom

Examples

Experimental program
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preparation example Construction

[0064] In some embodiments of the method of preparing a structured surface according to the present invention, the initial density of upstanding elements is at least 248 per square centimeter (cm 2 ) (1600 / square inch (in 2 )). For example, the initial density of upright elements can be at least 394 / cm 2 (2500pcs / in 2 ), 550 pieces / cm 2 (3500pcs / in 2 ) or at least about 787 / cm 2 (5000pcs / in 2 ). In some embodiments, the initial density of upright elements can be up to about 1575 / cm 2 (10000pcs / in 2 ) or up to about 1182 / cm 2 (7500pcs / in 2 ). For example, at 394 pcs / cm 2 (2500pcs / in 2 ) to 1575 / cm 2 (10000pcs / in 2 ) range of initial densities may be useful. However, the spacing of the upstanding elements need not be uniform. The initial density of the rod will affect the thickness of the implement that can be used to pass between the row of upstanding elements.

[0065] Upstanding elements of various shapes can be used in the practice of the invention. The up...

example

[0143] hook strap

[0144] The hook straps of Comparative Examples 1-4A (available from 3M Company, St. Paul, MN)). The polymer used to make the hook strap was an ethylene-propylene copolymer available from Dow Chemical Co., Midland, MI under the trade designation "C700-35N." The hook density is 1600 hooks per square inch (248 hooks / cm 2 ) (arranged in a square array) and the pillars are tapered in shape. In Table 1, the total thickness, basement film thickness, basis weight, cap diameter in the transverse direction, and cap diameter in the longitudinal direction are reported for Comparative Examples 1-4A. The cap shapes of Comparative Examples 1 and 2 were oval. The cap shapes of Comparative Examples 3, 4, and 4A were circular. Comparative Example 4A was prepared from Comparative Example 4 by forming a "hook head with a downwardly projecting fiber engaging portion" using the procedure described in US Patent No. 6,132,660.

[0145] Table 1

[0146]

[0147] use ...

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Abstract

A method of making a structured surface is disclosed. The method includes providing a thermoplastic backing with multiple rows of upstanding elements. The upstanding elements include stems with proximal ends attached to the thermoplastic backing and distal caps, and each distal cap has an overhanging portion that extends beyond the stem in a first direction. For at least some of the multiple rows, an implement is passed between two adjacent rows, wherein the implement contacts the overhanging portion of at least some of the distal caps in the two adjacent rows such that at least part of the overhanging portion is turned in a second direction, different from the first direction. A structured surface that can be prepared by the method is also provided along with a fastening laminate that includes a carrier and the structured surface and an absorbent article that includes the fastening laminate. A tool useful for carrying out the method is also provided.

Description

Background technique [0001] Articles having one or more structured surfaces can be used in a variety of applications such as abrasive discs, automotive parts assembly, and disposable absorbent articles. These articles may be provided as films exhibiting, for example, increased surface area, mechanical fastening structures, or optical properties. [0002] Mechanical fasteners, also known as hook and loop fasteners, typically include a plurality of closely spaced upstanding projections with loop-engaging heads that act as hook members, and the loop members typically include a plurality of woven, non-woven Woven or knitted loops. Mechanical fasteners can be used to provide releasable attachment in many applications. For example, mechanical fasteners are widely used in wearable disposable absorbent articles to fasten such articles about the human body. In a typical configuration, a hook strip or patch attached to a fastening tab on the rear waist portion of a diaper or incontin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A44B18/00
CPCA44B18/0065
Inventor 利·E·伍德蒂莫西·P·帕里瑟尤
Owner 3M INNOVATIVE PROPERTIES CO