Method and apparatus for the production of a printing stencil
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United States of America Patent
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Jun 20, 2000
Issued Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Jan 26, 1995
priority date (Note) -
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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.
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