Patent GB-484792-A (GB)
Title: Improvements in and relating to pile fabrics and their treatment
IPC: D03D27/00
Filed: 1936-10-05
Abstract: 484,792. Coating pile fabrics. STEPHENS, A. J. (Collins & Aikman Corporation) Oct. 5, 1936, No. 6858/38. Divided out of 484,795, [Group IX]. [Class 140] [Also in Group IX] A pile fabric with a porous single plane backing of interwoven warp and weft threads and V-pile tufts looped around backing threads is impregnated with a normally insoluble binder composition or hydrosol such as latex, artificial dispersions of rubber, synthetic rubber derived from chloroprene or pyroxylin &c., which is confined to the backing and those parts of the tufts which are in the plane of the backing, as shown in Fig. III, so that the ventilating properties of the fabric are not destroyed. Apparatus for treating the fabric locally to dehydrofuge or remove or neutralize water-repellent matter, such as natural or applied wax, grease &c. and afterwards applying a hydrosol adhesive so as not to fill the interstices of the backing, comprises rollers 31, 32, 33, 34 over which the fabric passes face downwards under a rotary brush 35, which applies powder or liquid supplied through valved discharge ports 36. This is pressed in by nip rollers 39 and excess is removed by a suction extractor 40. After a repeat treatment as shown, if necessary, the fabric is dried by passage over steam heated drums, and it may then be wetted by steam jets 47. Loose tufts are then removed by a brush 48, and loosened tufts forced back into position by a roller 49 and a cylinder 50 at opposite sides of a card clothing roller 51. The fabric then passes beneath a blade 53 to which a baffle plate 54 conveys hydrosol discharged through a cock 55 of an adjustable reservoir. The blade and a roller 57 force the hydrosol into the yarns, the blade clearing off the tips of the pile bights. The hydrosol is vulcanized &c. into a discontinuous layer by a tenter drier whilst stretched on tenter chains 59. An apparatus for dehydrofuging the fabric generally is described comprising several separate compartments through which the fabric passes. The first may contain sodium oleate and trisodium phosphate solution, the second soap solution, and the third a rinse. After passage over a vacuum hydro extractor, the fabric is impregnated without being dried. An endless belt apparatus for local scouring treatment is referred to. The apparatus used may constitute a unit in a range for plush dyeing. Other materials for scouring the fabric &c. which are referred to comprise ammonia, soda, oil solvents which may be of the chlorinated type such as ethylene dichloride, trichloro-ethane, or carbon tetrachloride and may be emulsified with water. When it is undesirable to wet the fabric, for example, if it contains predyed yarns, it is treated with fuller's earth, or other absorbent clay, or chemically treated silicate. If diethylene glycol has been added to the fibres of the fabric during the spinning &c. it is removed by treatment with water. A swirling blade, or one with a rounded or bevelled edge may be used. The coating machine described in Specification 369,910, may be employed, a suitable composition for use therewith being specified. Specification 484,795 also is referred to.