Process and apparatus for coating webs and adjusting the wet application weight of the coating material
US4279949A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1979 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Oct 4, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H5/0062
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The disclosure concerns both an apparatus and a method for adjusting the applied weight of a coating composition on a web traveling over a support roll. The support roll is opposed by a scraper that removes excess coating composition which was just previously applied to the web. The scraper has an entrance flank that is opposed to the support roll. The downstream end of the entrance flank is defined by a sharp edged end. The length of the pressing zone between the scraper and the support roll is adjusted by swiveling the scraper around its axis with respect to the support roll so as to adjust the position of the sharp edged end of the scraper with respect to the coated surface of the web. The surface of the support roll is elastic so that it can be depressed under the pressure applied thereto by the sharp edged end of the entrance flank. The scraper may be developed as a sector of a roll having the axis of the scraper as the axis of the curve. Further, there may be a plurality of scrapers on a single support body, thereby facilitating easy substitution of scrapers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.