Impregnation procedure for a textile sheet
US5509161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06B1/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The procedure for impregnating a woven or non-woven, knit, fiber sheet with an aqueous liquid, in particular of the kind containing a treatment agent, is characterized in that it consists of: (i) depositing the sheet 6 on a liquid-permeable, endless cloth 4, (ii) pouring by gravity the liquid in the form of a curtain or lamina onto the sheet and transversely to the direction of advance of this sheet, (iii) generating by means of a vacuum slit 13 mounted underneath the cloth sufficient pressure drop that at least part of said liquid shall pass through the sheet, the rate of poured liquid as defined in relation to the weight of the sheet moving underneath said curtain exceeding a specific value beyond which the entrainment rate is a function of said pressure drop but independent of the amount poured so as to make possible homogeneous impregnation and easy control of the entrainment rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.