Process and apparatus for the production of photocopies using tw

Details Process and apparatus for the production of photocopies using tw Process and apparatus for the production of photocopies using tw

1977-05-26

1979-01-23

Griffin, Donald A.

Photocopying

Contact printing

Machine

96 49, G03C 158, G03B 2730

Patent

active

041358147

ABSTRACT:
This invention relates to an improvement in the process for the production of photocopies with two-component diazotype material which cannot be developed by the action of heat alone and which, during continuous passage through a photocopying machine, is first exposed imagewise to light emitted by a mercury lamp and is then exposed, for the purpose of development, to an ammonia/water mixture, in vapor form, in a development chamber, the improvement comprising employing light emitted from a gallium-modified or indium-modified mercury lamp for the imagewise exposure of the diazotype material, and exposing the diazotype material, which has been exposed to light, to an ammonia/water vapor mixture in the development chamber, said mixture in terms of vapor pressure being unsaturated and containing at most 25 per cent by weight of ammonia, at a temperature of about 105 to 120.degree. C and at a predetermined pressure. The invention also relates to an apparatus for performing the process.

REFERENCES:
patent: 2761364 (1956-09-01), Cross
patent: 3160085 (1964-12-01), Mastroianni
patent: 3380365 (1968-04-01), Umahashi
patent: 3397630 (1968-08-01), Pratt
patent: 3411906 (1968-11-01), Boone et al.
patent: 3421895 (1969-01-01), Haining et al.
patent: 3589810 (1971-06-01), Umahashi
patent: 3710708 (1973-01-01), Schuman et al.
patent: 3715213 (1973-02-01), Nihyakumen et al.

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