Relief printing plate having projections in non-image areas

Details Relief printing plate having projections in non-image areas Relief printing plate having projections in non-image areas

1975-09-26

1977-09-06

Kimlin, Edward C.

Printing

Printing members

Plates

101456, 101457, 96 351, 96 363, B41N 100, G03C 500

Patent

active

040460711

ABSTRACT:
A printing plate comprising a support, reliefs formed thereon as an image area, and from about 20 to about 4,000/cm.sup.2 small projections thereon in non-image areas, the height of the reliefs being at least 0.05 mm larger than that of the small projections, and a method for making a printing plate which comprises:
A. superimposing a photosensitive resin layer having a thickness of at least 0.06 mm on a support, which is at least semi-transparent to actinic light, in intimate contact therewith;
B. exposing the resulting assembly to actinic light through an image-bearing transparency from the side of the photosensitive resin layer;
C. exposing the assembly to actinic light through a dot-image-bearing transparency having a transparent halftone dot area in a proportion of 1 to 40% from the side of the support to thereby form reliefs on the support, as image areas, and a number of small projections having a height of at least 0.01 mm and being lower than the height of reliefs, in non-image areas, wherein steps (b) and (c) may be conducted in the order: (b) and then (c); or (c) and then (b); or simultaneously.

REFERENCES:
patent: 1532696 (1925-04-01), Hassard et al.
patent: 2058396 (1936-10-01), Baker
patent: 2854336 (1958-09-01), Gutknecht
patent: 3146106 (1964-08-01), Hamlin
patent: 3536008 (1970-10-01), Ritzerfeld
patent: 3651759 (1972-03-01), Ritzerfeld
patent: 3661575 (1972-05-01), Ketley et al.
patent: 3891443 (1975-06-01), Halpern et al.

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