Printing plate blank and image sheet by laser transfer

Details Printing plate blank and image sheet by laser transfer Printing plate blank and image sheet by laser transfer

1974-04-08

1976-03-23

Coughenour, Clyde I.

Printing

Planographic

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

1014011, 346 76L, 427 53, B41C 106, B41C 110, G01D 1514

Patent

active

039453189

ABSTRACT:
This is a lithographic printing plate blank adapted to be processed by applying a beam of laser radiation through a radiation transparent sheet to transfer selected portions of a combustible coating material on the sheet onto a lithographic surface; the lithographic surface provides a hydrophilic background on which oleophilic printing areas are provided by the transferred material. In the composite blank the coated sheet is held electrostatically in intimate contact with the lithographic surface, which is a grained surface, so that the coated surface and lithographic surface are maintained in intimate contact in spite of the generation of gases therebetween due to the laser initiated combustion which would ordinarily tend to separate the surfaces and reduce resolution. The coated sheet is provided with an electrostatic charge during manufacture of the composite sheet, either by manually inducing the charge or by building the charge into the sheet to make it an electret.

REFERENCES:
patent: 1117490 (1914-11-01), Horney
patent: 1482356 (1924-01-01), Dausmann
patent: 3010390 (1961-11-01), Boskes
patent: 3554125 (1971-01-01), VanDorn
patent: 3592644 (1971-07-01), Vrancken
patent: 3619157 (1971-11-01), Brinckman
patent: 3745586 (1973-07-01), Braudy
patent: 3787210 (1974-01-01), Roberts
patent: 3793025 (1974-02-01), Vrancken et al.

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