Letterpress printing plate having printing surfaces with a low s

Details Letterpress printing plate having printing surfaces with a low s Letterpress printing plate having printing surfaces with a low s

1992-12-07

1995-03-14

Burr, Edgar S.

Printing

Printing members

Plates

101401, 1014011, 101492, 430306, B41N 112

Patent

active

053968417

ABSTRACT:
A letterpress printing method is disclosed wherein a printing plate, having plastic surface with a critical surface tension in the range of approximately 18-35 mN/m, is engraved or otherwise provided with raised ink-bearing impression sites and the printing plate is used for printing in a letterpress printing machine. As examples, the plastic surface of the printing plate may comprise a fluoropolymer, polytetrafluoroethylene or a copolymer of tetrafluoroethylene and hexafluoropropylene. The low surface tension is shown to enhance the printing quality in this environment.

REFERENCES:
patent: 3025186 (1962-03-01), Eekhout
patent: 3221654 (1965-12-01), Jernt
patent: 3255695 (1966-06-01), Johnson et al.
patent: 3260779 (1966-07-01), Tarbox
patent: 3554836 (1971-01-01), Steindorf
patent: 3832948 (1974-09-01), Barker
patent: 3910187 (1975-10-01), Cords
patent: 4178850 (1979-12-01), Helmig
patent: 4528909 (1985-07-01), Rigg et al.
patent: 4765243 (1988-08-01), Schiefer et al.
"Newspaper Technology", Man Roland USA, Inc.

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