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Development of Diazo Film Using Platen Pressure

IP.com Disclosure Number: IPCOM000095519D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Wilbur, CV: AUTHOR

Abstract

Diazo film can be developed by means of a porous ribbon member which is impregnated with an ammonia gas-generating material. The ribbon is pressed against the diazo surface to be developed by a heated platen. The pressure and heat supplied by the platen cause ammonia gas to be quickly formed in the proper amount to develop the diazo film. No excess ammonia gas remains to contaminate the room air.

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Development of Diazo Film Using Platen Pressure

Diazo film can be developed by means of a porous ribbon member which is impregnated with an ammonia gas-generating material. The ribbon is pressed against the diazo surface to be developed by a heated platen. The pressure and heat supplied by the platen cause ammonia gas to be quickly formed in the proper amount to develop the diazo film. No excess ammonia gas remains to contaminate the room air.

In one material, ammonium carbonate is ground to a paste with a solution of three per cent butyral polyvinyl plastic binder in methyl ethyl ketone. This paste is applied to porous filter paper with a brush and the excess wiped off. A platen, heated to a temperature of approximately 100 degrees C., then presses the impregnated filter paper against a strip of diazo film at pressures of 14 psi and 100 psi for one second and two seconds.

Additional ammonia generating materials are ammonia salts of weak acids, inclusion compounds of ammonia, inorganic complex salts of ammonia and ammonia absorbed on surface active powders. All these produce satisfactory development of the diazo film.

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