Composite elastomeric yarns and fabric
View Patent ↗The present invention relates to composite elastomeric yarns and fabrics, to methods of making same, and to articles in which such yarns and fabrics are used. The composite yarns of the present invention comprise a elastomeric core, an elastomeric thermoplastic sheath disposed about the core and, preferably, fibers mechanically anchored in the sheath. The composite fabrics of the present invention comprise the composite yarns of the present invention and conventional fibers arranged to form a fabric.
1. A method of making a composite fabric comprising the steps of:
(a) providing fibers;
(b) providing composite elastomeric yarns comprising an elastomeric core component and an elastomeric thermoplastic sheath component disposed about the core component wherein a melting point temperature of the sheath component is at least about 10° C. lower than a melting point temperature of the core component;
(c) forming a composite yarn arrangement by disposing the fibers about the sheath component of the composite elastomeric yarns by spinning or twisting;
(d) heating the composite yarns to a temperature so as to soften or at least tackify at least a portion of the sheath component of the composite elastomeric yarns to facilitate an anchoring of at least a portion of the fibers in at least a portion of the sheath component of the composite elastomeric yarns;
(e) cooling the composite yarn arrangement of fibers and composite elastomeric yarns to anchor at least a portion of the fibers in at least a portion of the sheath component of the composite elastomeric yarns; and
(f) forming the composite fabric by weaving, knitting, braiding, or felting the composite elastomeric yarns and fibers.
2. The method of claim 1 wherein the melting point temperature of the sheath component is at least about 50° C. to about 75° C. lower than the melting point temperature of the core component.
3. The method of claim 1 wherein the composite yarns are stretched from about 10% to about 500% beyond the relaxed state prior to disposing the fibers about the sheath component.
4. The method of claim 1 wherein the fibers are non-elastic fibers.
5. The method of claim 1 wherein the composite fabric comprises a composite elastomeric fabric.
6. The method of claim 1 wherein the elastomeric core component comprises an elastomeric monofilament or a plurality of elastomeric filaments.
7. The method of claim 1 wherein the elastomeric core component comprises a denier range from about 500 to about 2500.
8. The method of claim 1 wherein the elastomeric core component comprises a Shore D hardness of about 55 to about 74 and the elastomeric sheath component comprises a Shore D hardness of about 35 to about 45.
9. The method of claim 1 , wherein heating the composite yarns comprises heating to a temperature at or above that of the melting point temperature of the sheath component of the composite yarns but below that of the melting point temperature of the core component of the composite yarns.