THE RESEARCH OF QUALITY OF THERMOTRANSFER PRINT IMAGES ON COTTON TEXTILE MATERIAL

Abstract

The article presents thermogravimetric studies of cotton textile material before and after printing by thermal transfer printing. Thermal transfer printing on garments and knitwear, umbrellas, bags, advertising banners, posters, etc. is popular. Transfer printing technology involves the transfer of the image to the textile material using an intermediate medium. First, the desired image is formed on a special paper or film using screen printing. Then, with the help of temperature in special presses, it is transferred to the textile material. If the image is multicolored, the whole process is repeated separately for each color. Heat transfer technology allows to apply high- and multi-color images to finished products or semi-finished products with high accuracy; to carry out personalized printing. Since thermal transfer printing involves the presence of high temperatures to obtain an image on the material, a comprehensive thermal analysis of cotton fabric was performed before and after printing. A test scale with a raster line from 100 to 140 lines / cm was used for research. Densitometric indicators of quality of the formed thermotransfer images by plastezol paints are given. It is established that with the increase of the line of raster images the color indicators of the prints on the textile material decrease slightly, which must be taken into account when fulfilling orders in industrial conditions. Using electron microscopy, the process of interaction of dye with cotton fibers in the fixation of printed images was studied. Significant influence on the quality of prints on textile material of surface structure of cotton fibers, their structure, dye composition and printing modes is confirmed. It is established that cotton fabric with printed image at 140 oC provides high quality color printed thermal transfer images. This is confirmed by such qualimetric indicators as optical density, image contrast, brightness. Modeling the mechanism of fixing the printed image on the fabric during thermal transfer printing can be divided into four stages: diffusion of the dye from the environment to the surface of the fibers; sorption of the dye on the surface; diffusion of dye inside the fiber; sorption of the dye on the inner surface of the fiber, which require more detailed and in-depth studies.