Relief printing plate manufacture
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United States of America Patent
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-
May 22, 1990
Grant Date -
N/A
app pub date -
Jun 7, 1988
filing date -
Jun 17, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A relief flexographic printing plate is prepared by image-wise exposure of the 'printing face' of a layer of photocurable polymer through a negative 7 and image-wise back exposure of the layer 4 through a support sheet 3 and a positive 6 of the image to be printed, thereby selectively curing the floor regions 9 of the printing plate in register with the uncured areas 8 left in the printing face of said layer. Preferably a further non-selective back exposure operation is carried out for additionally curing the floor regions.
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