SU1632795A1 - Dyening ribbon for percussion printing devices - Google Patents

Abstract

The invention relates to the production technology of tapes for percussion-type printing devices — full-character and needle-like. The dye ribbon is made in the form of a woven fabric impregnated with a printing composition of polyamide fabric, consisting of round-shaped complex weft yarns with a twist of 1-100 twists / m and complex basic yarns with a twist of 200-500 twisted / m, while the density of the fabric on the basis more than duck fabric density by 41-52 threads / cm. Fabric density on the base is 89-94 threads / cm, and weft is 42-48 threads / cm. The number of filaments in the main and weft yarns is 26-36. The main threads are round. 2 epf-ly, table 2 & yo

Description

The invention relates to textile based ink ribbons, in particular ink ribbons for percussion-type printing devices — full-character or needle-type.

The purpose of the invention is to improve the quality of the tape.

The ink ribbon for printing devices is made in the form of a woven fabric impregnated with a printing composition of synthetic fabric, consisting of round-shaped complex weft yarns with a twist of 1-100 torsions / m and complex main threads. It is made of fabric whose density on the base exceeds the weft density of the weft by 41-52 threads / cm, while the number of filaments in the main and weft threads is 26-36, and the main threads are round. The fabric has a density on the basis of 89-94 threads / cm, and a weft density of 42-48 threads / cm and the main

the threads have a twist of 200-500 torsions / m. The linear density of the main yarns is 3.3-5.0 tex, and the weft is 3.3-7.6 tex. If the difference in the density of the fabric on the basis and weft is less than 41 threads / cm, then the fabric does not absorb the dye well, and if it is more than 52 threads / cm, then the fabric becomes rare and print quality deteriorates sharply, the structure of the fabric is observed. Making a dye ribbon from multifilament multifilament yarns allows one to increase its filament, reduce the thickness while increasing strength, and ensure that the dye tape is made to a cassette version for use in computer technology in order to obtain the maximum amount of information.

The fabrication of ink ribbons for printing devices is carried out on an applicator roller by soaking.

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synthetic fabric with a thickness of 0.90-1.10 mm printing ink containing carbon black, tinting fat-soluble dyes, oleic acid, oil, surfactant, to a degree of impregnation of 30.0%.

Example. Samples of dye ribbons are produced on a roller machine by impregnating samples of synthetic fabric with printing ink of the composition, wt%: carbon black (TG — 100) 20.0; Indulin 14.0; Methypholet dye 2,3; oleic acid 48.6; industrial oil and 20A 9.4; castor oil 5.6; zinc stearate 0.1. The degree of impregnation of tissue samples is 30%. The characteristics of the fabric used in the dyeing tape are given in Table. 1 (samples 1-7). At the same time 8 tab. 1 shows the characteristics of the polyamide fabric used in the known tape (samples 12 and 13). as well as control tissue samples, the main characteristics of which go beyond the parameters of the threads used in the proposed tape (samples 8-11).

The tapes are tested using an Yatran electromechanical typewriter and No. 1 writing paper weighing 70 g / m2. The number of prints from one place on the tape, the print quality, the ability of the tape to regenerate (visual assessment) are determined. For a formalization property trap, a decrease in the optical density of prints during printing / restoration of properties during regeneration is determined by measuring the optical density of prints. In addition, the sharpness of prints is determined by the ratio of the optical density of the imprint of the letter H to the area of the horizontal element of this letter. Optical density

The footprints are measured with a reflective densitometer (first, sixty, sixty first lines), and the area of the horizontal element is determined with the help of an instrument of the technical vision system and judged by the number of shaded cells. The measure of clarity is a dimensionless quantity. Results

presented in table 2 (samples 1-13).

As can be seen from the presented results in table. 2, the proposed ink ribbon is characterized by a higher uniformity of printing (the drop in optical density from the 1st to the 60th row is 0.09-0.04) and a high definition of the prints (0.616-0.668).

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Claims (3)

1. Ink tape for impact type printing devices made in the form of a plain weave fabric impregnated with a printing composition of polyamide fabric consisting of complex staple and weft yarns, the last of which are circular in shape and twist 1-100 torsions / m, characterized in that, in order to improve the quality of the tape while maintaining its strength, the fabric density on the basis exceeds the weft density by 41-52 threads / cm, while the number of filaments in the main and weft threads is 26-36. and the main threads are round. 2. Tape according to claim. T, characterized with the fact that the fabric has a density on the basis of 8994 threads / cm, and a weft density of 42-48 threads / cm. 3. The tape according to claim 1, characterized by the fact that the main threads have twist 200500 torsions / m.