Análise colorística de estampas sublimáticas em malhas 100% poliéster

Abstract

The stamping sector has been going through several changes and has evolved, as is the case of sublimation printing, which is a technique that consists of printing a specific ink (sublimation) on special paper, with specific treatment. Printing is performed on printers with an inkjet system, allowing prints with several colors simultaneously, with extreme speed, quality and economic viability. After printing, the paper with the image and the textile material to be printed are placed in a thermal press, with controlled time and temperature, in order to carry out the sublimation printing process (where the image migrates to the textile material). In the process of sublimation printing, it is necessary to study the behavior of each material used, because, depending on the composition, structure and types of different yarns, different behaviors may occur in each case. In addition to the textile material, it is essential to control process parameters such as time and temperature, because without controlling these parameters, variations in color tones or even defects such as color migration to the wrong side of the fabric may occur, affecting thus the quality of the same, being able to stain other parts of the material. This study aimed to carry out the color analysis of prints in primary colors (blue, red and yellow) in four 100% polyester meshes, each of which was produced with different structures and types of polyester yarn, verifying the behavior of primary colors, through the reading of reflectance values and coloristic intensity (K/S), through the variation of time and temperature during printing. For the realization of this study, an experimental research was developed, in order to verify the influence of the parameters of the sublimation process, in the coloristic efficiency in each mesh. As a result, it was verified that using temperatures of 240ºC with a time of 30 seconds, there was a migration of the color to the wrong side. In addition to this, a temperature of 200ºC together with a time of 10 seconds practically did not cause color transfer/absorption to the meshes. Finally, it can be concluded in this work that for the textured meshes they presented a greater coloristic intensity, which is due to the fact that the yarns are multifilament. In general, the temperatures and times referring to the samples of central points were the parameters that presented the highest coloristic intensities without the color migrating to the reverse side of the fabric.