Apparatus for treating textile fabric to retard inflammability
US3946497A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1973 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Jan 15, 1993 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M11/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Textile fabric previously impregnated with THPOH is treated to retard inflammability by passage therethrough of toxic ammonia gas in apparatus which permits the THPOH-NH.sub.3 reaction to be carried out in a sealed chamber preventing escape of the toxic gas. The invention operates to confine the gas in a flow path whereby substantially all of the gas flowing through the apparatus is passed directly through the fabric. The fabric is passed through the sealed chamber by means of gas-tight entrance and exit portals. A perforated drum is mounted within the chamber and the fabric is passed about the perimeter of the drum. Sealing elements cooperating with the drum confine ammonia gas introduced into the interior of the drum to flow only through those perforations covered by fabric. Undue accumulation of water which is a product of the reaction is avoided by both the slanted ceiling configuration of the chamber which promotes condensate runoff and the positive gas flow velocity established within the chamber which tends to draw water vapor from the reaction site.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.