Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1993-09-17
1995-07-11
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428110, 428138, 428113, 428299, 428296, 428286, 428287, 428298, 156163, 156164, 156229, B32B 512, B32B 700, B32B 3108, D03D 300
Patent
active
054319919
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to process stable composite elastic nonwoven fabrics and to processes for producing them. More specifically, the invention relates to process stable composite nonwoven elastic fabrics having desirable strength, conformability, and stretch and recovery properties, and which can be more readily manufactured and processed using existing textile equipment as compared to prior nonwoven fabrics.
BACKGROUND OF THE INVENTION
Nonwoven elastic fabrics have been the subject of considerable attention and effort. Elastic fabrics are desirable for use in bandaging materials, garments, diapers, supportive clothing and personal hygiene products because of their ability to conform to irregular shapes and to allow more freedom of body movement than fabrics with limited extensibility.
Elastomeric materials have been incorporated into various fabric structures to provide stretchable fabrics. In many instances, such as where the fabrics are made by knitting or weaving, there can be a relatively high cost associated with the fabric. In cases where the fabrics are made using nonwoven technologies, the fabric can suffer from insufficient strength and only limited stretch and recovery properties.
Elastomers used to fabricate elastic fabrics often have an undesirable rubbery feel. This is particularly true with thermoplastic elastomers rather than cross-linked elastomers. When these materials are used in composite nonwoven fabrics, the hand and texture of the fabric can be perceived by the user as sticky or rubbery and therefore undesirable.
Nonwoven fabrics having thermoplastic elastomers incorporated into the fabric structure can be extremely difficult to process and to manufacture. For example, tension control during fabric manufacture and/or during downstream processing can be extremely critical. A small change in tension can result in stretching or recovery of the fabric which can lead to a non-uniformly manufactured product. Tension control is even more aggravated when heating is required, for example, during fabric drying, adhesive application, lamination, thermal bonding or other thermal treatment. When subjected to heat and tension, the fabric can stretch and otherwise undergo greater distortion than when the fabric is at room temperature. In addition, thermoplastic elastomers can lose elastic properties when stressed at elevated temperatures and allowed to cool fully or partially while stressed, and/or the thermoplastic fibers and filaments are apt to break, thereby causing the elastic fabric to lose a portion or all of its elastic properties. Still further, when elastic fabrics are wound into rolls, stretching of the fabrics can occur during the winding process and the fabric can lose elastic properties during its subsequent storage due to the phenomenon of creep.
U.S. Pat. No. 4,775,579 to Hagy, et al. discloses desirable composite elastic nonwoven fabrics containing staple textile fibers intimately hydroentangled with an elastic web or elastic net. One or more webs of staple textile fibers and/or wood pulp fibers can be hydroentangled with an elastic net according to the disclosure of this invention. The resulting composite fabric exhibits characteristics comparable to those of knit textile cloth and possesses superior softness and extensibility properties. The rubbery feel traditionally associated with elastomeric materials can be minimized or eliminated in these fabrics.
U.S. Pat. No. 4,413,623 to Pieniak discloses a laminated structure such as a disposable diaper which can incorporate an elastic net into portions of the structure. The elastic net can be inserted in a stretch position between first and second layers of the structure and bonded to the layers while in the stretch condition. Subsequent relaxation of the elastic net can result in gathering of the structure.
U.S. Pat. No. 4,525,407 to Ness discloses elastic fabrics which include an elastic member which may be an elastic net intermittently bonded to a substrate which prior to stretching is less easily extens
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Austin Jared A.
Gessner Scott L.
Quantrille Thomas E.
Fiberweb North America, Inc.
Lesmes George F.
Shelborne Kathryne E.
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