Process for the treatment of non-woven sheets and the product ob

Details Process for the treatment of non-woven sheets and the product ob Process for the treatment of non-woven sheets and the product ob

1984-05-21

1985-12-24

Morris, Theodore

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Mixed fibers

264171, 428373, 428374, D06M 900, D02G 300

Patent

active

045603855

ABSTRACT:
A process for the treatment of non-woven sheets made of synthetic textiles containing two constituents arranged side-by-side, one based on polyamide (polyhexamethyleneadipamide) and the other based on polyester (polyethylene glycol terephthalate), in which the following steps are carried out: (a) conversion to a sheet of the crimped textile having an overall linear density of less than 2 dtex, (b) optional needle bonding of the sheet, and (c) chemical treatment at low temperature in an aqueous solution of a swelling product for one of the constituents, permitting contraction and at least partial separation of the two constituents of the textile, the strands of which each then have a denier of less than 1 dtex. Swelling product: aqueous solution of formic acid at a concentration of 50% to 70%, preferably of between 55% and 65%, and at a temperature of between 5.degree. C. and 40.degree. C., preferably of between 18.degree. C. and 25.degree. C.
The non-woven sheets obtained, having characteristics enabling them to be used in the majority of textile applications such as clothing, furnishing and the like.

REFERENCES:
patent: 3117906 (1964-01-01), Tanner
patent: 3616504 (1971-11-01), Otto
patent: 3718534 (1973-02-01), Okamoto
patent: 4150674 (1979-04-01), Yung
patent: 4280860 (1981-07-01), Shen
patent: 4460649 (1984-07-01), Park

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