Comparison of direct and indirect transfer printing

Transfer printing is divided into two kinds: direct transfer and indirect transfer. The direct method is commonly known as pad printing. The indirect method can be completed according to the processing method and conditions. Usually, there is a transfer paper in the intermediate. The general production of transfer paper is relatively tedious, because it is composed of a plurality of parts such as a transfer bottom paper layer, a transfer ink layer, a transfer adhesive, etc., and has a high processing cost for a small batch of products, but has a high requirement for some print quality. In terms of products, decoration and decoration, the transfer technology has its unique advantages (such as rapid transfer, accurate overprinting, firmness, low scrap rate, etc.). For some textiles, the use of a simple thermal transfer process can solve the problem of the high cost of thermal transfer paper that is specially produced due to the small number. Its raw materials: A paste for printing (mixed with thickener or PTF in proportion to water), low temperature or room temperature adhesives, disperse dyes (selects lower sublimation temperatures, such as disperse red 3B, disperse yellow 2GG, disperse blue 2BLN, etc.), a small amount of urea or color enhancer.

Slurry preparation: first North Korea A to help paste 65 to 85 parts and adhesives 35 to 15 parts (a total of 100 parts mixed weight, and then disperse the dye plus a little warm water to dissolve into the A paste and paste mixed with a good paste In addition, add the proportion (1~4):100 and mix thoroughly, add a small amount of additives (such as fixing cross-linking agent) as required to enhance the color fastness of the color paste.

Transfer paper printing: Use a white paper (80g or more) that is smooth, thick, and hard to be infiltrated as a graphic plate. Use screen printing methods to print calligraphy and painting patterns on paper. You can also draw by hand-painting. Dry and transfer paper. Multi-color printing should be gradually dried and printed. It should be noted that the image printed on the paper is the reverse side, so that the pattern transferred to the fabric is positive.

Thermal transfer: Slightly flatten the printing fabric, rotate it on the stamp pad with carpet or artificial leather cloth (the tablet is glued with the platen), put the printing paper on the printing face down, use an electric iron or press The ironing machine is hot for about 20s. The temperature depends on the fabric material. Generally about 130°C, the iron must be moved slowly during ironing to avoid ironing the fabric. When ironing, the position of the printing paper should be kept. After cooling, it can be peeled off. To transfer paper, usually this type of transfer paper can be used repeatedly.