Apparatus for making a printing plate from a porous substrate

Details Apparatus for making a printing plate from a porous substrate Apparatus for making a printing plate from a porous substrate

1975-05-28

1976-12-28

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Radiated energy

101471, 264 25, 264321, 346 76L, B29C 2300

Patent

active

039999181

ABSTRACT:
A thermoplastic plate, for example one of polypropylene or nylon, fabricated so it has an open-cell structure, has a radiation transparent cover sheet applied to one face thereof. The cover sheet has an energy absorbing coating (e.g. of carbon and nitrocellulose) in intimate contact with the plate. A modulated laser beam is then transmitted through said cover sheet to selectively transfer some of the energy absorbing material to the plate according to the configuration required to define the areas of relief desired in the plate. The cover sheet is then removed except for the portion of the energy absorbing coating transferred to the plate. The plate is heated (either before or after the foregoing steps) to a temperature just below the temperature at which the thermoplastic radically changes viscosity. The entire surface of the plate is then exposed to infra-red rays. The portions of said surface to which energy absorbing material was transferred are very quickly elevated in temperature, by the absorbed infra-red energy, to the point that the structure beneath the transferred material collapses, thus causing those portions to sink to a plane below the plane of the other portions of the plate.

REFERENCES:
patent: 2825282 (1958-03-01), Gergen et al.
patent: 3739088 (1973-06-01), Landsman
patent: 3742853 (1973-07-01), Landsman
patent: 3836624 (1974-09-01), Ferris

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