| 摘要 |
A method of applying foam to fabric by expanding a chemical foaming mixture against a fabric is characterized by wetting the fabric with a liquid e.g. water, aqueous solution of carboxymethyl cellulose, gasoline, oils, freezing the liquid in the fabric to solid e.g. ice, expanding the chemical foaming mixture in contact with the frozen wetted portion of the fabric, retaining the liquid as a solid within the fabric during reaction of the foaming mixture to control the degree of foam strike-through into the fabric, and fluidizing the solid by heating before the resultant foam loses its tackiness to permit adherence of the foam to the fabric. The fabric may be a discontinuous fabric e.g. of cotton, having interstices therein or a tufted loop pile carpet having a wool pile woven on a jute control. The liquid may be frozen to a solid to bridge the interstices. The solid may be fluidized by heating before complete gaseous expansion of the foam mixture has occurred and before the resultant foam loses its tackiness to allow some strike through of foam into the fabric and to permit adherence of the foam to the fabric. The chemical foaming mixture may be expended on the fabric between carrier and cover sheets. The foaming mixture may consist of a resin comprising polyether and a polyisocyanate. |
