Patent EP0006263A1 successfully refreshed from Google Patents.
EP0006263A1
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A stabilized rayon web and structures made therefrom
Assignee: Georgia Pacific Nonwovens LLC
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Filing: 1979-06-07
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Granted: —
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Expires: 1999-06-07
Abstract
Abstract A stabilized absorbent rayon web (1) which may be used alone or which may serve as outer plies for absorbent structures. The rayon web (2) may be a spunbonded web or an air laid, wet laid or carded web of staple length or longer fibers, with substantial fiber orientation in a direction perpendicular to the plane of the web by virtue of the way in which the web is formed or by virtue of mechanical or hydraulic needling. The thermoplastic web (3) is melted into the rayon web from the bottom surface thereof to a controlled penetration depth of from about 10 % to about 40 % and preferably from about 10 % to about 25 %. As a result, the cross over points of the rayon fibers are effectively stabilized form the bottom of the rayon web to the controlled penetration depth therein while the aesthetics of the upper surface of the rayon web are undisturbed. The thermoplastic web may be of any appropriate polymer and any structured form having an open area of at least about 40 %. The stabilized rayon web demonstrates improved resistance to surface abrasion, improved tensile strength, improved web bulk and resiliency and improved dimensional stability, both wet and dry. The bottom surface of the stabilized rayon web can be heat bonded to other webs without the use of additional thermoplastic material.
Inventors
- 👤 William Joseph Boyd, Iii
- 👤 Mary Katherine King
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/02; B32B5/022; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/60; B32B27/00; B32B27/12; B32B2262/00; B32B2262/04; B32B2307/00; B32B2307/50; B32B2307/514; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/66; Y10T442/668
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
122 words
A stabilized, absorbent, nonwoven binderless rayon web characterised in that it comprises a nonwoven rayon web having substantial Z direction fiber orientation and a nonwoven web of thermoplastic material, said thermoplastic web being melted into said rayon web from one surface of said rayon web to a penetration depth of from lO% to 40%, and preferably from 10% to 25% of the thickness of said rayon web, said rayon web having an initial basis weight before stabilization of from 20 to 75 grams per square meter and said thermoplastic web having an initial basis weight of from 5 to 25 grams per square meter, said rayon web having an expose surface free of said thermoplastic material whereby its surface aesthetics are undisturbed.
Claim 2
Dependent Claim
122 words
A stabilized, absorbent, nonwoven binderless rayon web characterised in that it comprises a nonwoven rayon web having substantial Z direction fiber orientation and a nonwoven web of thermoplastic material, said thermoplastic web being melted into said rayon web from one surface of said rayon web to a penetration depth of from lO% to 40%, and preferably from 10% to 25% of the thickness of said rayon web, said rayon web having an initial basis weight before stabilization of from 20 to 75 grams per square meter and said thermoplastic web having an initial basis weight of from 5 to 25 grams per square meter, said rayon web having an expose surface free of said thermoplastic material whereby its surface aesthetics are undisturbed.
Claim 3
Dependent Claim
16 words
A structure according to Claim 1 wherein said rayon web is a spunbonded continuous filament web.
Claim 4
Dependent Claim
80 words
A structure according to Claim 1 wherein said rayon web is a web of discontinuous rayon fibers of at least staple length chosen from the class consisting of an air laid web, a wet laid web, a carded web, an air laid and mechanically needled web, a wet laid and mechanically needled web, a carded and mechanically needled web, an air laid and hydraulically needled web, a wet laid and hydraulically needled web and a carded and hydraulically needled web.
Claim 5
Dependent Claim
59 words
A structure according to any one of Claims 1-3 wherein said thermoplastic web is chosen from the class consisting of an expanded film web, an extruded and embossed web, a melt blown web and a spunbonded web made from a polymer chosen from the class consisting of polyethylene, polypropylene, ethyl vinyl acetate, ethyl methyl acrylate polyester, nylon and polyurethane.
Claim 6
Dependent Claim
45 words
A structure according to any one of Claims 1-4 including a core of at least one ply, said stabilised rayon web being bonded to one side of said core with its exposed surface facing away from said core to form a composite nonwoven absorbent material.
Claim 7
Dependent Claim
31 words
A structure according to Claim 5 wherein the core comprises any one or more of a hydrophobic thermoplastic ply, a hydrophilic thermoplastic ply, a tissue web or a cellulosic fluff material.
Claim 8
Dependent Claim
107 words
A structure according to any one of Claims 1-4 including a second non woven rayon web having an initial basis weight before stabilization of from 20 to 75 grams per square meter, said second rayon web being bonded to said first mentioned rayon web by said thermoplastic web being melted into said second rayon web from one side thereof to a penetration depth of from lO% to 40%, and preferably from 10% to 25% of the thickness of said second rayon web, said second web being stabilized by said thermoplastic material and having an exposed surface free of said thermoplastic material whereby its surface aestheti.cs are undisturbed.
Claim 9
Dependent Claim
50 words
A structure according to any one of Claims 1-5 including a second similar stabilised rayon web, said stabilised rayon webs being bonded together, either directly or through one or more core plies, so that said exposed surfaces face away from each other, to form a composite non woven absorbent material.
Claim 10
Dependent Claim
51 words
A structure according to Claim 8 wherein the core comprises an outer pair of tissue webs respectively bonded to the stabilised rayon webs by said first mentioned theremoplastic webs, an intermediate pair of thermoplastic webs and a central hydrophilic melt blown non woven fibrous web positioned between said intermediate thermoplastic webs.
Claim 11
Dependent Claim
44 words
A structure according to Claim 8 wherein the core comprises two outer melt blown thermoplastic webs respectively overall bonded to the stabilised rayon webs by said first mentioned thermoplastic webs, an intermediate pair of fluff webs and a central hydrophilic melt blown web therebetween.
Claim 12
Dependent Claim
19 words
A structure according to either one of Claims 9 and 10 wherein the core webs are spot bonded together.
Claim 13
Dependent Claim
26 words
A structure according to any preceding claim wherein the nonwoven rayon web has an initial basis weight before stabilisation of from 20 to 35 g/sq. metre.
References Cited (Backward Citations)
US3481806A
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FR1505092A
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US3697347A
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FR2064067A1
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US3878014A
Cited
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