Continuous process for the liquid ammonia treatment of fabrics
US3980429A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1975 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | May 14, 1995 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M2101/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The disclosure relates to a continuous process for the treatment, with liquid ammonia, of moving webs of fabric, the fabric having at least a partial content of natural or regenerated cellulose fiber. Fabric in substantially continuous web form is guided into a treatment chamber and there impregnated with liquid ammonia, desirably by immersion in a bath thereof. The advantageous effects of the liquid ammonia reaction are substantially realized, while undesirable excessive shrinkage of the fabric is avoided, by strictly limiting the time within which liquid ammonia reactions may occur and controllably terminating the reaction at the end of the controlled period. In the process of the invention, the liquid ammonia reaction period commences when the fabric is first introduced into the bath of liquid ammonia and is controllably terminated by bringing the ammonia-saturated web of fabric into contact with a heated drum. As a significant feature of this invention, the reaction period for a fully saturated fabric web is controlled to have a duration of between 0.6 and 9 seconds. Pursuant to one aspect of the invention, a fabric web is conveyed through a processing zone under controlled len…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.