Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Simultaneous severing and shaping – or severing while work...
Patent
1976-06-18
1978-03-07
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Simultaneous severing and shaping, or severing while work...
101382MV, 1014011, 1014012, 264234, 264255, 264259, 264293, 264295, 264296, 264313, 264314, 264319, 264320, B29C 512, B29C 1710, B29D 900
Patent
active
040780317
ABSTRACT:
A flexible resilient printing plate adapted for use on a magnetic printing cylinder is formed by mixing a ferrous metal powder within a volume of liquid vinyl plastisol, casting the mixture onto a face layer of at least partially cured vinyl plastisol to form a base layer, and then heating the combined layers to cure the base layer and fuse it to the face layer to form a flexible multiple layer mold sheet. The base layer is shaved to provide the mold sheet with a substantially uniform thickness, and a porous fibrous impression mat is placed in contact with the face layer. The mat and mold sheet are heated and are placed within a diaphragm press with a porous cloth between the mold sheet and the diaphragm. The mold sheet is pressed into the mat to form a printing plate which is allowed to cool during the pressing operation. The mat and plate are magnetically retained on the bed for a shaver, and the base layer of the plate is shaved to produce a precise uniform caliper. After the printing plate is shaved and stripped from the porous mat, it is reheated until it relaxes. The reheated plate is placed on a drum having an outer diameter the same as the magnetic cylinder and is held in firm contact with the drum until the plate cools.
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