Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Patent
1999-04-26
2000-12-12
Baxter, Janet
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
4302711, 4302751, 4302731, 430945, G03F 736, G03C 177, G03C 176
Patent
active
061596590
ABSTRACT:
A plate for flexographic, or `raised image`, printing consists of a backing layer, an intermediate layer and a top layer. The backing comprises a thin metallic sheet or a thin polyester sheet for dimensional stability. The intermediate layer is a closed-cell elastomer foam. The top layer is a thin layer of solid elastomer. The intermediate layer absorbs strongly at an operating wavelength where the backing is either essentially transparent or highly reflective. When the plate is cut with a laser operating at the operating wavelength then the cutting action is self-limiting. As soon as the backing is exposed to the laser beam then the beam is either transmitted through the backing or reflected from the backing. In either case damage to the backing is avoided. Most of the thickness of the plate is in the intermediate layer which has a low density. Thus it takes much less energy to cut a plate according to the invention than is required to laser cut conventional flexographic printing plates.
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patent: 5386430 (1995-01-01), Yamagishi et al.
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Baxter Janet
Creo SRL
Lee Sin J.
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