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Diazo Copy Process and Apparatus

IP.com Disclosure Number: IPCOM000095664D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Aebi, CM: AUTHOR [+2]

Abstract

This is a process for developing diazotype prints. There is an ammonia generation and control device for carrying out this process.

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Diazo Copy Process and Apparatus

This is a process for developing diazotype prints. There is an ammonia generation and control device for carrying out this process.

In this dry process, an ammonia compound 31, such as ammonium carbonate (NH(4))(2) CO(3), is heated by heat source 26 to generate ammonia gases. These develop the exposed copy paper 14, containing the diazo compound and coupling component. An inert fluid 32, such as silicone oil, is positioned between compound 31 and the exposed side of paper 14. When heat is applied from source 26, the ammonia base is generated and bubbles up through the inert fluid 32. The ammonia gas bubbles 31a seep through the porous grid support 23 to develop the superposed diazo coated paper 14.

When the heat is turned off, the ammonia base generation and bubbling ceases. The inert fluid 32 acts as a heat sink to aid in temperature dissipation and also, there is practically no escape of any lingering gas fumes due to the resistance afforded by the inert liquid blanket. When the operating temperature is dropped sufficiently, the force required to disperse any gas bubbles through the inert liquid is no longer present. The inert fluid material 32 acts much as a mechanical valve, but allows a large area of diazo to be developed in a short time because there are no ammonia base diffusion problems inherent to a valve arrangement.

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