Edge dam assembly for paper coating apparatus
US4327662A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Apr 14, 2000 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H5/0015
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved edge or end dam assembly for an applicator for applying a coating liquid to a web of moving paper carried on a backing roll, the applicator being of the type having a chamber for receiving the coating liquid and an opening therein for directing the liquid onto the web, the opening being formed between a front wall of the chamber and a doctor blade extending from the rear of the opening to against the web, is characterized by a seal element sealed with the front wall and doctor blade in an end space therebetween and extending toward and closely adjacent but spaced from the web. The face of the seal element adjacent the paper web has a plurality of grooves extending generally parallel to the direction of movement of the web, so that coating material which seeps past the seal element and beyond the edge dam assembly enters the grooves and is moved by the web toward the doctor blade for deposit on the web. In this manner, leakage of coating material past the seal element is significantly minimized, and pressure of coating material on the web may be maintained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.