Method for producing a flexographic printing frame through multiple exposures using UV LEDS
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United States of America Patent
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Jan 8, 2019
Grant Date -
Jan 4, 2018
app pub date -
Dec 16, 2015
filing date -
Dec 17, 2014
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Abstract
A method for producing flexographic printing plates. The method has the following steps:
- (a) producing a mask by imaging the digitally imagable layer,(b) exposing the photopolymerizable, relief-forming layer through the mask with actinic light, and photopolymerizing the image regions of the layer, and(c) developing the photopolymerized layer by washing out the unphotopolymerized regions of the relief-forming layer with an organic solvent, or by thermal development, whereinstep (b) contains at least two exposure cycles with actinic light with an intensity of 100 to 5000 mW/cm2 from a plurality of UV-LEDs, the energy input into the photopolymerizable, relief-forming layer per exposure cycle being 0.1 to 5 J/cm2.
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