SU679681A1 - Heat-sensitive paper and method of making same - Google Patents

Description

Such paper possesses performance characteristics; whiteness, strength, bonding of the temperature-sensitive layer with the substrate. The introduction of ethylcellulose as a svayushuy ensured uniformity of coating, which somewhat, but not enough, improved the speed and quality of the recording compared to the production of Krasnogorodsk BK. . In addition, according to the method of obtaining paper, after the nano: ix on the substrate the thermosensitive layer undergoes natural drying, which significantly slows down the speed of the irrigation tank (up to 2 m / min) and reduces its productivity. Even a slight increase in the drying temperature leads to a deterioration in the quality of the coating — the process of cracking of the first layer of the SOUTH layer begins, which progresses as the drying temperature rises. The aim of the invention is to increase the speed of recording information. The goal is achieved by a g & l that in a well-known paper bag consisting of a base paper and a body of a sensitive coating containing zinc stearate and ethyl cellulose, according to the invention, the coating components are taken at the following ratio and (in ;.% ): Zinc 7O stearate - 75 Ethylcellulose 25-3 O The method consists in the fact that in the well-known manufacture of heat-sensitive paper by dissolving ethnyl cellulose in ethyl alcohol, mixing the solution with zinc stearate followed by raalol and applying the resulting emus on b Mage-based and posleduk Tsey sushi Coy paper according to the invention prior to applying the coating of the emulsion on the paper base in the emulsion introduced into the precipitator, and drying the paper is carried out at a temperature of 75-125 C. In an precipitator used in CA, glycerol, glycerol aqueous solution. The coating is applied in an amount of 3-4.5 g / m. To increase strength. securing the sensitive layer on the paper substrate, additionally applying a water-soluble polymeric substance to it. As a water-soluble polymeric substance, a methylcellulose solution is used. Example. 8.6 kg of ethyl cellulose are dissolved in 245 kg of alcohol Krepost1; 95-96, 2 at a temperature of 50-60 ° C for 2 hours. After cooling, 20 mg of zinc tearate are added while stirring. The mixture is thoroughly mixed and produced by grinding in mills to the degree of grinding of 1O-30 μm according to Klin. Then, with continuous stirring, 77 kg of precipitator - water is added to the enamel and the resulting heat and enamel enamel is fed into the bath of the watering machine. Enamel is applied to a black paper backing using a squeegee role-playing method. Drying is carried out in hot air drying ovens at a temperature of 75-125 ° C while the paper web is moving at a speed of up to 8 m / min. The coating weight is 3 g / m. PRI mme R 2. Dissolve 6, 7 kg of ethyl cellulose in 245 kg of ethyl alcohol of 95-96 strength, 2, at a temperature of 5 ° -6 ° C for 0, 5-1, 5 hours. After cooling while stirring, add 2O. kg of zinc stearate. The mixture is thoroughly mixed and milled in mills to the degree of grinding of 1O-Zomkm according to Klin. Then, to the resulting enamel with continuous stirring, add 77 ml of a precipitator - water and the resulting heat-sensitive enamel is pumped into the bathroom of a watering machine. Enamel is applied on a black paper base. Coating weight 4, 5 g / m. The method of application and the drying mode are the same as in Example 1. EXAMPLE 3 8 kg of ethyl cellulose and 245 kg of ethyl alcohol of 95-96.2 alcohol are dissolved at a temperature of 50-6 O for an hour. After cooling the solution ethylcellulose added 20 kg of zinc stearate to it. The mixture is thoroughly mixed and the grinding is carried out in mills to the degree of grinding 10-ZO. um according to Klin. Then, to the resulting etali, with continuous stirring, 26 kg of the precipitator -glycerin a are added and the resulting solid-sensitive enamel is pumped into the bathroom of the watering machine. Enamel is applied on a black paper base. Coating weight 3.5 g / m. The method of application and the drying mode are the same as in Example 1. EXAMPLE 4. 7 kg of ethyl cellulose are dissolved in 245 kg of ethyl alcohol with a strength of 95-96, 2 at a temperature of 5 ° C to 60 ° C. cooling

ethyl cellulose solution is added thereto with 20 kg of zinc stearate. The mixture is thoroughly mixed and milled in mills to the degree of grinding of 1O-Zomkm according to Klin. Then, with continuous stirring, 61 kg of 30% glycerin aqueous solution (precipitator) is added to the enamel and the resulting heat-sensitive enamel is pumped into the bathroom of the watering machine. Enamel is applied on a black paper base. Coating weight 3, 5 g / m. The method of application and drying mode are the same as in Example 1. EXAMPLE 5. Thermal Sensitive Coating Prepared in Example 1-4

Chanos t protective film using a 2 ° solution of methylcellulose. Coating weight - About 5-1 g / m. Application method and drying mode, similar to examples G-4.

For a comparative analysis, samples of heat-sensitive paper according to the invention, paper of domestic production (shredded by Krasnogorsk ZBK) and paper obtained according to the prototype were tested.

The test results are given in. the table.

Maximum write speed of 1 line with gaps), m / s

Recording speed (lines without breaking m / s.

Holding strength

heat sensitive

lay

Paper thickness, µm When comparing samples of thermosensitive paper according to the invention with prototype paper and paper produced by the Krasnogorodsk paper mill, its obvious advantages were established, first of all, according to one of the main parameters U9, B - recording speed. The use of the invention provides the following advantages in comparison with existing methods: - the possibility of obtaining a heat-sensitive paper, approaching on the basic technical and operational characteristics and foreign samples i (writing speed up to 2 .5 m / sec., Strength of the heat-sensitive layer, etc. - the ability to carry out the drying process of a thermosensitive coating at a temperature of 125 ° C to temperature due to the introduction of a precipitator coating into the enamel - an increase in the speed of the watering machine to 80 m / min;

.1.0

unsuccessful

Claims (2)

ВО-65 - increase of technological equipment productivity; - a significant reduction in production costs. 1. Thermosensitive paper, consisting of a base paper and a thermosensitive coating applied on it, containing zinc stearate and ethyl cellulose, characterized in that, in order to increase the speed of information recording, the coating components are taken in the following ratio (in weight. %): Zinc stearate 70 - 75 Ethyl cellulose 25 - 30 2. A method of manufacturing heat-sensitive paper according to claim 1 by dissolving ethyl cellulose in ethyl alcohol, mixing a solution of CO: Zinc stearate 7 followed by grinding, applying the resulting mixture on the base paper for drying the paper, characterized in that before applying the emulsion on the base paper in the BBO / JHT emulsion, the siege body is dried, and the drying of the paper is carried out at a temp. 75-125. 3. The method according to claim 2, which is based on the fact that water, glycerin or aqueous 10 glycerin is used as a precipitant. 4. A method according to claim 1, distinguishing JUK and also with the fact that in order to increase 6796 1 8 paper strength and heat-sensitive coating, a water-soluble polymer material is applied. 5. The method according to p. 1, differing in use and in that / as an aqueous solution of methylcellulose is used as a water-soluble polymer. Sources of information taken into account during the examination 1. USSR Copyright Certificate № 184609, cl. D 21 N 5 / OO, 1969. 2. Report VNIIB number O43O22, 1971.