Process for the treatment of non-woven sheets and the product obtained
US4560385A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1984 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | May 21, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2931
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.