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To ensure uniform penetration of the slurry into the fabric, tension-free production should always be maintained throughout the production process. The pulp should be as thick as possible, and the pressure should be appropriately increased. The speed should be determined according to the printing effect, generally 50m/min. If the pattern area is large and the pulp feeding amount is large, the speed can be reduced to improve the problems of "no bottom exposure" and "no drying".
The choice of scraper
The surface of the cotton knitted jersey is seriously uneven, to ensure uniform color, in addition to the permeability of the cloth and the performance of the color paste, the scraper is a crucial factor. In contrast, the types of scrapers, magnetic rod scrapers, air bag scrapers, and stainless steel scrapers have poor uniformity, and stainless steel scrapers are the best. Comparison of printing effects of different specifications of blades
Washing and softening process
The first cell is washed with a large amount of cold water flow → the second cell is washed with cold water flow → the third cell is washed with hot water at 50~60°C → the fourth cell and the fifth cell are soaped at 90~95°C (detergent 3~5g/l) → the first cell Six grids of hot water washing → seventh grid cold water washing → rolling water → eighth grid softening (softener amino silicone oil 10~15g/l) → rolling water, opening → drying
If the softener is improperly selected or used too much, it will cause water repellency of the finished fabric. Therefore, in the "softening treatment" of knitted fabrics for printing, the finishing process of bleached and dyed knitted fabrics should not be simply applied. Color fastness after printing, choose softener carefully, and formulate its dosage reasonably.
Styling finishing process requirements
Temperature 180~190℃
Time 30~40s
Overfeed 30~50%
Shrinkage 6~7% (horizontal)
7~8% (vertical)
Using the above process, the product quality meets the customer's requirements after production, and the indicators are shown in Table 4:
Table 4 Indicators of finished cotton knitted single jersey rotary screen printing products
Soaping fastness Dry rubbing fastness Wet rubbing fastness Horizontal shrinkage Vertical shrinkage gram weight torsion
Level 4~5 Level 4~5 Level 3~4 Level 6~7%7~8%130~135g/m22~3%
4: Conclusion
Large-scale production practice has proved that it is completely feasible to use rotary screen printing machine for large-scale printing of cotton knitted jersey.
As long as the materials are properly selected, the process control is stable, and the best production combination is selected for printing production, then the stability of the product quality is guaranteed, which not only breaks the habit of generally only using flat screen printing for knitted fabrics, but also greatly improves the production. Efficiency, opening up a new way for knitted fabric printing. Since the trial production, Wujin Jierui has produced more than 200 tons of these products. The products are soft to the touch, stable in size, and have good wearability. All finished product inspection indicators can meet the market demand.
