Method of making relief printing plates employing informed absorbing pick sheet
Abstract
Abstract AN IMPROVED METHOD FOR PROCESSING A COMPOSING MEMBER HAVING A HEAT SENSITIVE POLYMER DISPERSION COATING ON A STABLE BASE SUCH AS PLASTIC, USING INFRARED RADIATION AND NO SOLVENTS OR ETCHANTS TO FORM A RELIEF PRINTING PLATE. INFRARED ABSORBING INDICIA ARE PLACED IN THERMAL CONTACT WITH THE COATING AND THE COATING IS THEREBY SELECTIVELY HEATED THROUGH THE APPLICATION OF NEAR INFRARED RADIATION. THE COATING, NOW HAVING FUSED PORTIONS CORRESPONDING TO THE INDICIA, IS PLACED IN PHYSICAL CONTACT WITH A PICK SHEET AND IN THERMAL CONTACT WITH A TOTAL INFRARED ABSORBING MEDIUM. THE COATING THE PICK SHEET AND THE TOTAL INFRARED ABSORBING MEDIUM ARE ARRANGED SUCCESSIVELY OUTWARDLY FROM THE INFRARED SOURCE. THE PREVIOUSLY UNFUSED PORTIONS OF THE COATING FUSE AND ADHERE TO THE PICK SHEET. WHEN THE PICK SHEET IS PEEDED OFF, THE PREVIOUSLY FUSED PORTIONS CORRESPONDING TO THE INDICIA, REMAIN ADHERE TO THE BASE TO FORM A RELIEF PRINTING MEMBER. THE PREVIOUSLY UNFUSED PORTIONS ARE NOW FUSED TO THE PICK SHEET AND MAY BE USED AS AN INTAGLIO PRINTING MEMBER, IF DESIRED.
Inventors
- 👤 William J Mueller
Bibliographic Details
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