SU956314A1 - Thermographic machine - Google Patents

Description

(54) THERMOGRAPHIC MATERIAL

one

The invention relates to thermography, namely to the creation of heat-sensitive materials that can be used to copy and reproduce information.

A thermographic material is known that consists of a substrate and a temperature-sensitive layer deposited on it based on a composition of iron sterate with pyrocatecine hexamethylene tetraamine com-. pepex l.

The disadvantage of this material is low resolution.

Closest to the proposed thermographic material, consisting of j non-porous substrate. (Stekpo, quartz, mica, heat-resistant plastic, ceramics) and heat-sensitive layer applied on it, made of heavy metal iodide, isolated from the group containing 20 bismuth. , lead, thallium, cadmium and silver 2j.

The heat-sensitive layer is obtained by thermal spraying in vacuum on

substrate. In order to obtain a copy of the text or the surface of an object, a sheet of paper with text is brought into close contact with the thermo sensual sing and is heated. Operating temperature range. WITH:

70-15О

for bismuth iodide 160-260 for lead iodide 190-28O for thallium iodide 150-210 for cadmium iodide for silver iodide 12O-18O

The disadvantage of this thermographic material is that copying occurs at high temperatures.

The aim of the invention is to reduce the copy temperature.

Claims (2)

This goal is achieved by the fact that a thermographic material consisting of a non-porous substrate and a heat-sensitive layer deposited on it on the basis of a heavy metal iodide selected from the group containing bismuth, lead, taply, cadmium and silver, according to the invention, is also heat sensitive contains metappic activator in the following ratio of components, mass. %: Heavy iodide metapl5O-99.9 Metallic activator0, 1-50 The lower limit of activator content is due to the fact that the heat-sensitive area contains a small amount of catalytically active centers, and the copy temperature region decreases slightly for these reasons. The upper limit of the content of the activator is due to the fact that the activator veils the temperature-sensitive layer, reducing the maximum achievable contrast of the invention. The invention is illustrated by the following examples. EXAMPLE 1 Vacuum evaporation (pressure 1 O mm Hg, UVR-2 installation) was sprayed from two boats at the same time with 1 OO mg (66.7%) of pure bismuth triiodide 50 mg (33.3%) serum qualification is pure. The distance between the substrate and the boats is 16 cm, the spray time is 50 seconds. Close contact with the layer is made of plain paper with text to be copied (newspaper sheet, book, letter, etc.). The system of the original and the thermographic material is placed on a thermostatic surface having a temperature of from 60 to 110 ° C and heated for 2 minutes. After that, the original and copy are separated. The copy is a mirror-image negative contrast image of the original. Example 2. The method for producing thermographic material and a copy is the same as in Example 1, but tellurium is used as an activator. The temperature range of copying is from TO to 13 ° C. Example 3. Thermal evaporation of a quartz substrate using the same conditions was followed by spraying 50 mg (33.3%) of bismuth qualification pure for analysis and 100 mg (66.7%) of lead iodide, which is chemically pure, by successively under the same conditions. The method of obtaining a copy is the same. The copy temperature range is 140-220 ° C. Example 4. The procedure for obtaining thermographic material and a copy is the same as in Example 3, but 2OO mg of bismuth (5O%) and 200 ml (50%) of lead iodide are sequentially applied to the substrate. . The copy temperature region is the same, but the image is visible only to reflection. Example 5 A mite substrate (muscovite) was sprayed successively with 15Omg (99.9%) of qualification pure iodide for analysis and 0.15mg (0.1%) of pure qualification copper. The method of obtaining a copy is the same. The copy temperature range is 170-250 ° C. Example 6. The glass is sprayed successively with 30 mg (17%) of copper of qualification pure and 15O mg (83%) of cadmium iodide of qualification pure. The method of obtaining a copy is the same. The copy temperature region is 135,190 ° C. Example 7. 50 ml (27.5%) of qualifying pure silver and 130 mg (72.52%) of qualifying silver iodide pure for analysis are sprayed onto the glass successively. The method of obtaining a copy is the same. The temperature range of the copy of 11O-165s. The proposed thermographic material operates in the temperature range 10-40 ° C lower than the known one, as a result of which the original deteriorates to a lesser extent in the process of obtaining a copy, and the ambient temperature is taken faster at copies. The copying process is accelerated as the predominantly heat-sensitive layer is heated rather than the massive substrate. Image contrast is usually higher. Thermographic material allows to obtain copies from typographical and handwritten texts, drawings, drawings, from paper, metal, plastic and other surfaces, as well as Allows the sequential application of additional information. With a transparent substrate, mines can be used for photo printing or projection. The material does not require additional chemical treatment (development, fixing) and is easy to manufacture. The invention of the Thermographic material consisting of a non-porous substrate and a heat-sensitive support deposited on it based on a heavy metal selected from the group consisting of bismuth, lead, thallium, cadmium, silver, about 5 and 95: With a chain of lowering the copying temperature, the thermosensitive junction additionally contains a metappic activator with a sped ratio of components, masses. %: Iodide of a metaphor50-99, 9 Metappic activator, 1-5O 14 Sources of information taken in the course of an examination 1. Collector Modern systems for recording and reproducing an image. M., Art, p. 11O-113, 1972. 2. USSR author's certificate N 622695, kp. In 41 M 5 / OO, 1976 (prototype)