Laminated composites

a technology of laminated composites and elastic composites, which is applied in the field of laminated elastic composites, can solve the problems of inability to produce a single elastic composite that possesses all of them, and the same film has the disadvantage of being neither breathable nor conformable, and achieves the effect of adding tensile strength

Inactive Publication Date: 2005-04-21
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] Several alternative elastic composites can be made within the method of the invention. The apparatus may be modified to include an upstream roll for dispensing a scrim that comprises spaced-apart filaments oriented in the machine direction that are substantially perpendicular to spaced-apart filaments oriented in the cross direction. Using this modified appa

Problems solved by technology

Although all of these properties are pursued by workers in the field, it is difficult in practice to produce a single elastic composite that possesses them all, because the materials and methods that are ideally suited to provide some of the desired properties may at the sa

Method used

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  • Laminated composites
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  • Laminated composites

Examples

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example 1

Porous Elastic Wrap

(Nonwoven / / BMF-PSA / / Filaments / / Nonwoven Laminate)

[0099] A porous elastic wrap comprising a laminate having nonwoven polypropylene outer layers, elastic filaments, and a melt blown adhesive was prepared according to the following process.

[0100] A melt blown fiber (BMF) pressure-sensitive adhesive (PSA) web comprised of three-layer polymeric fibers was prepared using a melt blowing process similar to that described, for example, in Wente, Van A., “Superfine Thermoplastic Fibers,” in Industrial Engineering Chemistry, Vol. 48, pages 1342 et seq. (1956) or in Report No. 4364 of the Naval Research Laboratories, published May 25, 1954, entitled “Manufacture of Superfine Organic Fibers” by Wente, Van A.; Boone, C. D.; and Fluharty, E. L., except that the BMF apparatus utilized two extruders, each of which fed its extrudate to a gear pump that controlled the polymer melt flow. The gear pumps fed a three-layer feedblock (splitter) assembly similar to that described in U....

example 2

Porous Elastic Wrap

(Nonwoven / / BMF-PSA / / Filaments / / Nonwoven Laminate)

[0103] A porous elastic wrap was prepared according to the process described in Example 1, except that two layers of polyester spunlaced nonwoven (34 g / m2 basis weight, Product No. 5601, PGI Nonwovens, Mooresville, N.C.) were substituted for the two polypropylene spunbond nonwoven layers. The shirred elastic laminate was very soft in feel and was observed to adhere very well to the “hook side” of a mechanical fastener, for example, Hook XMH-4132 (Minnesota Mining and Manufacturing Company, St. Paul, Minn.). Samples of the laminate were cut for subsequent test evaluations.

example 3

Porous Elastic Wrap

(Nonwoven / / BMF-PSA / / Filaments / / Scrim / / Nonwoven Laminate)

[0104] A porous elastic wrap was prepared according to the process described in Example 1, except that a weft-inserted polyester scrim layer with 18 yarns / 2.5-cm (40 denier, machine-direction) and 9 yarns / 2.5-cm (150 denier, cross-direction) (Product No. 924864, Milliken Company, Spartanburg, S.C.) was inserted between the first layer of polypropylene spunbond nonwoven and the elastic filaments layer. The three layers were wrapped around the collector drum and conveyed in front of the BMF die at a collector-to-die distance of 12.7 cm. The BMF-PSA web was blown onto the filaments side of the composite to bind the scrim and stretched filaments to the nonwoven. This composite was then transported approximately 38.1 cm to a nip point where another layer of polypropylene spunbond nonwoven was brought into contact with the BMF-PSA side of the construction. A nip force of 551 N was applied across a 51-cm width of ...

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Abstract

A laminated composite suitable for use in medical products such as tapes and wraps. The composite includes, for example, a first nonwoven fiber layer, an elastic layer, a melt blown adhesive fiber layer, and a second nonwoven fiber layer. A scrim layer serves as a deadstop, or stretch limit, to prevent over stretching. The non-woven fiber layer(s) and/or the scrim layer form suitable loops for a hook and loop fastening system. The scrim layer in some embodiments is employed to make the composite finger tearable. The melt blown adhesive layer, nonwoven web layer and elastic layer form a breathable, porous elastic composite. Methods of manufacturing the composite are also disclosed.

Description

RELATED APPLICATIONS [0001] This application is a division of U.S. patent application Ser. No. 10 / 282,515, filed Oct. 29, 2002, now allowed, which is a continuation of application Ser. No. 09 / 444,349, filed 19 Nov. 1999, now U.S. Pat. No. 6,503,855, which is a continuation-in-part of U.S. patent application Ser. No. 09 / 165,672, filed Oct. 2, 1998, now abandoned, and Ser. No. 09 / 257,447, filed Feb. 25, 1999, now abandoned in favor of divisional application, U.S. patent application Ser. No. 09 / 821,669, filed Mar. 29, 2001. The entire disclosures of the related applications are incorporated by reference herein.FIELD OF THE INVENTION [0002] This invention relates to laminated elastic composites that are suitable for use in tapes, wraps and bandages, and to a method of making such laminated elastic composites. BACKGROUND OF THE INVENTION [0003] Elastic composite materials are widely used in many forms in a large number of medical products such as tapes, wraps, bandages and wound dressing...

Claims

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Application Information

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IPC IPC(8): A44B18/00B29C43/22B32B5/26D04H13/00
CPCA44B18/0003A44B18/0046B29C43/222B32B5/26Y10T24/27D04H13/007Y10T24/2792Y10T428/24008Y10T428/24017D04H13/006D04H1/593D04H3/045Y10T442/184Y10T442/671Y10T442/602Y10T442/66Y10T442/68Y10T442/102Y10T442/2738Y10T442/643Y10T442/16Y10T442/601Y10T442/159Y10T442/69Y10T442/659Y10T442/668Y10T442/681B32B7/12B32B5/06B32B37/12B32B2535/00B32B5/12B32B5/022B32B2305/026B32B3/20B32B2305/20
Inventor MENZIES, ROBERT H.EDGAR, JASON L.TUMAN, SCOTT J.SEIDEL, DAVID L.MAKI, ROBERT J.RIEDEL, JOHN E.JOSEPH, EUGENE G.LEVITT, LEONBERG, BRANDON T.
Owner 3M INNOVATIVE PROPERTIES CO
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