Low friction pressure seal for fabric processing chamber
US3939576A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Jul 19, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/906
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A chamber seal is provided, which accommodates the entry into and exit from a processing chamber for a web of fabric. The seal serves to minimize the flow of gases into or out of the chamber, while at the same time minimizing frictional drag on the fabric, so that the fabric may be processed without excessive tension. The invention is especially useful in connection with processing of fabrics with liquid ammonia. The low pressure seal includes a guide member which engages and guides one surface of the fabric. The opposite surface of the fabric is contacted by a thin, flexible web of low friction material, such as Teflon-impregnated glass fiber cloth. The sealing web, which is highly flexible and conformable, is urged into contact with the fabric by means of a slightly compressed resilient tubular element, which is supported opposite the fabric guide. To advantage, the resilient element is not inflated, but provides the desired low pressure sealing force by reason of a slight deformation. The low friction web material is free of the resilient element and, in some cases, is movable relative thereto, in order to provide a renewed surface. In some cases, a single web of low friction se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.