Transfer printing is often used in textile printing. In this printing technique, the print of the depicted motif (design) is printed onto a carrier material, i. e. heat transfer, onto which a powder adhesive is applied, which later enables the transfer onto the selected textile with the help of temperature and pressure. Due to the widespread use of heat transfers, there are a large number of variants. They differ in the printing technique (they can be produced either by screen printing, inkjet printing or, less frequently, by other techniques), in the ink used (there are different inks on the market, produced on different bases, and each has its own method of preparation, printing and curing), in the purpose of use (e. g., heat transfers used in the automotive industry do not need to be washable, which is crucial for heat transfers in the textile industry), the number of ink layers on the transfer paper or passes through the printing machine, as well as the use of opaque intermediate ink (white or black), etc.
The aim of the diploma thesis was to compare the quality of different transfer prints, which differ in the shape of the motifs, the number of ink layers and the type of powder adhesives used for adhesion to the selected textiles. The aim of the study was to determine which adhesive is best suited for he selected textiles and to examine the adhesion properties of the transferred prints after 10 washes.
To determine which adhesive is suitable for the selected textile, the thesis was divided into two parts – theoretical and experimental. In the theoretical part, the screen printing and transfer printing techniques as well as the transfer material used (polyester film), the printing inks and the adhesives used were examined. The experimental part describes the selected textiles and the samples used, whereby the adhesive used and the number of ink layers printed varied, while the transfer material and the printing ink remained unchanged for all samples. This part also describes the procedures for heat transfer, measuring of the samples, washing and drying, and image analysis.
In our research we found that the size of the motif has an influence on the adhesion properties, the number of printed ink layers has no influence on the adhesion properties, but it does have an influence on the colour differences that occur before and after washing. We have also found that several different types of powder adhesives can be used on selected textiles with similar results.