Method of making flags by screen printing
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Method of making flags by screen printing

Release time:2022-06-13 09:34 view:223 次

Direct printing with disperse dyes. It is a special dye for polyester fabric, with complete chromatogram and bright color. At present, there are thousands of varieties produced at home and abroad, and there is a large choice. Direct printing with disperse dyes is a common process. As the name suggests, it means that the printing paste prepared from disperse dyes into the desired color is directly printed on white or light colored polyester fabric, after drying, the color is fixed at high temperature, and then washed, soaped and dried. The process flow is: color matching paste → screen printing → high temperature color fixing → washing → soaping → drying and finishing. During color matching, the amount of disperse dyes is determined according to the color depth, generally not more than 5%, The slurry used as the carrier accounts for 60% ~ 70%. According to different conditions, 1% ammonium sulfate and 5% urea are appropriately added. The remaining water is 100%. The color slurry should have good fluidity and stability. The printed board should be properly heated to prevent infiltration and improve production efficiency.


There are three methods for color fixation at high temperature: high temperature and high pressure steaming: 135 ℃ /20 ~ 30 minutes; high temperature and normal pressure steaming: 175 ~ 185 ℃ /8 ~ 10 minutes; and dry heat baking: 190 ~ 195 ℃ /2 ~ 3 minutes. It can be determined according to the respective conditions. Water washing is to wash the slurry and non fixed dyes at room temperature. Soap washing is to wash with 2g/l caustic soda solution at 80 ~ 85 ℃ / 10-15 minutes.


Screen printing discharge process. The discharge of disperse dyes is more difficult than that of other dyes. The key is the supply of high-temperature equipment and heat energy. At the same time, the technical requirements for preparing color paste are high, and the use of additives should be accurate. The discharge is to use dark medium color polyester fabric. Through the additives in the printing paste, the color of the printing part will be hydrolyzed into white under high temperature conditions. The discharge can be divided into white discharge and color extraction. For example, the flag of the Hong Kong Special Administrative Region is white, and the national flag of China is color extraction. In the white out printing paste, the size used for the carrier must be resistant to various chemical additives. The dosage is about 70%, stannous chloride (white out agent) 6% ~ 8%, citric acid 0.5% ~ 1%, brightener 1% ~ 2%, urea 3% ~ 5%, and water is added to synthesize 100%. The color out printing paste is basically made by adding disperse dyes resistant to reducing agents according to the white out prescription. Of course, there are many requirements in the specific operation. The fixation conditions of high temperature printing and direct printing are basically similar, and the best conditions can be selected according to local conditions.


There are many ways to make the banner by screen printing, because it is not limited by chromaticity, with rich colors and bright colors, so it has laid a good foundation for the production of propaganda banners.

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