Method and apparatus for the production of a printing stencil
US6076459A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1997 |
| Grant date | Jun 20, 2000 |
| Priority date | — |
| Expiry date | Dec 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
For the production of a printing stencil, a fine-mesh screen is provided with an unexposed photoemulsion layer and aligned in order to establish it in an essentially tubular or flat shape On the photoemulsion layer, those locations which are not to be exposed are covered with an opaque layer according to a particular pattern. The opaque coating layer--together with the non-exposed portions of the photoemulsion layer--is removed after the exposure of the non-covered locations of the latter. The opaque coating material contains wax and preferably is soluble in water. To avoid a perceptible starting line in the case of a tubular screen, the pattern start is varied according to any law, preferably following a sine line, in order to avoid a clear-cut separating line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.