| 摘要 |
1,050,293. Foam-backed fabrics. SPECIALTY CONVERTERS, Inc. March 3, 1964 [March 4, 1963], No. 8927/64. Heading B2E. A method of applying foam to fabric by expanding a foaming mixture, comprising a thermoplastic synthetic resinous composition containing a heat activatable blowing agent, against a fabric is characterised by wetting the fabric with a liquid that is substantially immiscible with the foaming mixture to render at least a portion of the fabric repellent to the foaming mixture, activating the blowing agent so as to expand the foaming mixture in contact with the wetted portion, retaining the liquid within the fabric during expansion of the foaming mixture to control the degree of foam strike-through into the fabric, and substantially eliminating the liquid from the fabric before the foam loses its tackiness to permit adherence of the foam to the fabric. The wetting liquid may be water, oil, or gasoline, to which a thickener e.g. carboxymethyl cellulose may optionally be added. The foam may be a polyurethane foam. The fabric may be a carpet or a discontinuous woven cotton fabric. The base of the carpet to which the foaming mixture is applied may be made from a woven jute material. In a typical embodiment, foaming mixture 12 is deposited on fabric 14 supplied from roll 13 submerged in water bath 15, and the foaming mixture on the fabric covered by covering sheet 10 is fed by carrier belt 11 through a heating zone. |
