Planographic printing master

Details Planographic printing master Planographic printing master

1973-04-13

1977-04-26

Coughenour, Clyde I.

Printing

Planographic

Lithographic plate making, and processes of making or using...

1014011, 101170, 101395, 101150, B41C 306, B41C 110

Patent

active

040194370

ABSTRACT:
A novel printing master and method for producing the same as disclosed, which comprises coating a suitable substrate with an uncured silicone gum, followed by the adherence thereto of a particulate image pattern. Resultant curing of the gum converts the gum to a tough elastomeric ink releasable film, thereby fixing the integral particles to the film while in intimate contact therewith. After curing, substantially all of the deposited particles are removed from the elastomer film, thereby revealing a "porous" image in the ink releasable film, of surprising ink receptive characteristics. The porous image thus is formed by contact of the integral particles of varying geometric shapes and sizes with the uncured silicone gum, thereby creating "impressions" of the particles in the gum which are then permanently stabilized in the gum by curing of the gum to an elastomeric film. The imaged printing master is then suitable for printing operations including both direct and offset lithography without a need for aqueous dampening solutions to provide ink release in non-imaged areas of the master.

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