GB970522A - Improvements in or relating to the manufacture of napped textile fabric - Google Patents

Abstract

970,522. Treating napped textile fabric. PEPPERELL MANUFACTURING CO. July 16, 1963, No. 28051/63. Headings D1L and D1S. The method of making shed-proof cloth having a body portion of woven fabric with a layer of predominantly cellulosic nap fibres projecting from one side, at least, and comprising coating, by spraying, the nap fibres of a conventional napped cloth, the coating material being in dilute aqueous dispersion capable of coating the nap fibres without modifying their chemical or physical characteristics, urging the nap fibres toward a position perpendicular to the body of the cloth and thereafter heating the fabric to cause the coating to set, is characterized in so mechanically working the nap, while dry, as to open the nap layer and straighten out and arrange the individual fibres so that they are disposed nearly at right angles to the body fabric, and, in directing the spray of coating material toward the free ends of the fibres thereby to wet individual fibres substantially to their junctions with the woven base fabric. For setting the coating material the fabric is heated to approximately 280‹F. and thereafter and before folding, the fabric is cooled until its surface temperature is at least as low as 200‹F. so as to eliminate stickiness of the coating material. The coating liquid preferred is a dilute, non-sticky dispersion of a thermo-setting acrylic polymer which is dispersed in water in the proportion approximately 10% polymer, 90% water. In the apparatus shown fabric F passes first beneath a nap-treating roll R<SP>1</SP> and then over a similar roll R<SP>2</SP>. It then passes, unsupported, to a second pair of nap-treating rolls and in its passage from one pair of rolls to the next is sprayed with the fibre coating liquid from sprays 5. The fabric then enters a tentering frame T which is housed in an oven K. On leaving tentering frame T the fabric passes through a cooling chamber M wherein the fabric is sprayed with cool water from atomizing nozzles N and by refrigerating coils E. From the cooling chamber the fabric is folded by device D into receptacle A. The nap treating rolls are covered with conventional 'napper roll cloth' and the bearings thereof are vertically adjustable. Rotation of the rolls is resisted by conventional friction brake-bands or belts or by electro-magnetic means, and suction nozzles V, V<SP>1</SP> are provided for removing fibres from the rolls.