Printing and screen printing of flags
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Printing and screen printing of flags

Release time:2022-06-15 15:01 view:190 次

1、 Direct printing with disperse dyes. It is a special dye for polyester fabric. It has complete chromatography, firm color and bright face. 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 is a printing paste prepared from disperse dyes into the desired color and color, which is directly printed on white or light colored polyester fabric. After drying, it is fixed at high temperature, washed, soaped and dried. The process flow is color matching paste → screen printing → high temperature fixation → washing → soaping → drying and finishing. During color matching, the amount of disperse dyes shall be determined according to the color depth, generally not more than 5%. The size used as the carrier accounts for 60% ~ 70%. According to different conditions, 1% ammonium sulfate and 5% urea shall be added appropriately, and the rest shall be synthesized with water. The color paste shall have good fluidity and stability. The printed board shall be heated appropriately to prevent infiltration and improve production efficiency.


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


2、 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, there are high technical requirements for the preparation of color paste, 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 is hydrolyzed to white under high temperature conditions. The discharge can be divided into white discharge and color discharge. For example, the flag of the Hong Kong Special Administrative Region is white, the national flag of China is color discharge, and the discharge is in the printing paste, The size used for the carrier must be resistant to various chemical additives. The dosage is about 70%, stannous chloride (whitening agent) 6% ~ 8%, citric acid 0.5% ~ 1%, whitening agent 1% ~ 2%, urea 3% ~ 5%, and 100% is synthesized by adding water. The printing paste of color drawing is basically made by adding reducing agent resistant disperse dyes according to the white drawing 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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