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Cavity Reflex Printing

IP.com Disclosure Number: IPCOM000098566D
Original Publication Date: 1959-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Prater, MP: AUTHOR

Abstract

It is common practice to utilize the property of certain inks to absorb infrared radiation and convert the same into reflex heat for effecting a color change in an adjoining layer of heat sensitive copy paper. Reflex heat printing can also be accomplished without the use of absorbing inks, where the original contains suitable cavities in which the entrapped air is heated by the infrared rays to produce a color change in the adjoining copy paper. The illustration shows a method of cavity reflex printing, which utilizes an original having intaglio characters produced in it by etching or embossure. Infrared rays penetrating the copy paper are at least partially absorbed by the air enclosed within the cavities in the original.

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Cavity Reflex Printing

It is common practice to utilize the property of certain inks to absorb infrared radiation and convert the same into reflex heat for effecting a color change in an adjoining layer of heat sensitive copy paper. Reflex heat printing can also be accomplished without the use of absorbing inks, where the original contains suitable cavities in which the entrapped air is heated by the infrared rays to produce a color change in the adjoining copy paper. The illustration shows a method of cavity reflex printing, which utilizes an original having intaglio characters produced in it by etching or embossure. Infrared rays penetrating the copy paper are at least partially absorbed by the air enclosed within the cavities in the original. The entrapped air and the portions of the copy paper opposing the cavities are heated above the color change temperature to cause the original information to be printed on the copy paper.

It is not essential that the original information consist of intaglio characters. Raised characters can also be utilized. Although the raised characters themselves do not produce any color change in the opposed portions of the copy paper, the air pockets surrounding the raised characters on the original absorb infrared radiation and cause the opposed areas of the copy paper to be heated above the color change temperature. This produces a vignetted effect on the copy paper, with the copied information appearing as white characters against...