Vacuum contact printing method and apparatus having a friction-r

Details Vacuum contact printing method and apparatus having a friction-r Vacuum contact printing method and apparatus having a friction-r

1989-09-07

1991-01-01

Hix, L. T.

Photocopying

Contact printing

Fluid pressure retention of carrier and receiver in exposure...

G03B 2720

Patent

active

049822292

ABSTRACT:
A vacuum contact printing apparatus includes: a transparent plate on which an original film and a photosensitive material are placed, an overlay sheet which covers the transparent plate, a friction reducing sheet provided between the transparent plate and the overlay sheet, and an evacuating device for removing air from between the overlay sheet and the transparent plate. The transparent plate is covered with the friction reducing sheet prior to or simultaneously with the covering of the original film and photosensitive material placed on the transparent plate wiht the overlay sheet. Frictional force caused by the change of the form of the overlay sheet can be prevented from being applied to the photosensitive material because the overlay sheet smoothly slides on the friction reducing sheet.

REFERENCES:
patent: 3658014 (1972-04-01), Kranz et al.
patent: 4580893 (1986-04-01), Giachetti

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