1501871-A is referenced by 12 patents.
1501871 Pile fabrics: shrinking fabrics DUNLOP Ltd 11 Feb 1975 [20 Feb 1974 6 Dec 1974] 7660/74 and 52984]74 Headings D1K and D1S [Also in Division B5] A pile fabric is made by superimposing webs (i) and (ii) of non-woven staple fibres, web (i) including crimped fibres and web (ii) comprising a major pronortion by weight of shrinkable fibres, needle-punching (i) through (ii) using forked needles to form the pile, and shrinking the shrinkable fibres to reduce the area of the fabric. Web (i) may comprise at least 50wt.% crimped fibres and may comprise polyethylene terephthalate, polyamide, polypropylene, acrylic or rayon fibres or mixtures thereof.; Web (ii) may have a weight/unit area less than 25%, e.g. 6-8%, that of web (i) and may comprise wool, polyethylene terephthalate polypropylene, polyamide or rayon shrinkable fibres; a majority of these fibres may be straight, but up to 20wt.% crimped fibres may be included. Either of the webs may be preneedled with barbed needles to improve their cohesion or treated to reduce fibre-metal friction and increase fibre-fibre friction, and they may be pre-bonded by adhesive or by light needling with barbed needles. The pile may be formed by needling with forked needles which may lie parallel or perpendicular to the fibre direction, thus producing a uniform pile or discrete fibre tufts, respectively. The fibres in web (ii) may be shrunk by heat and/or moisture or by "slack mercerisation" with aqueous NaOH. Heat - treatment may be carried out on a drum.; The pile fabric may be backed with SBR latex foam, natural latex foam, polyurethane foam, EPDM rubber, PVC or non-woven material, e.g. during heat-shrinking. The specification gives preferred fibre densities and lengths, web weights, needle-punching densities and fibre blends.