The cardboard is not tightly bonded and causes poor quality
Oval Cotton Pads,Natural Oval Cotton Pads,Oval Cotton Rounds,Makeup Remover Pads COTTONWHISPER (TAIZHOU) DAILY PRODUCTS CO.,LTD , https://www.zjcosmeticpuff.com
There are many factors mentioned above. A. High vehicle speeds shorten the residence time of the adhesive on the surface of the paper, and the tightness of the high-strength, low-weight paper influences the wettability of the adhesive.
Here are two questions:
1. If the viscosity of the adhesive is too low, the wettability will be improved, but there will be less starch particles for adhesion, and the water of the gelatinized carrier will be transferred into the paper so that the gelatinization will not be complete and the bonding will not be complete. prison.
2. If the viscosity is too high, it will cause uneven spreading of glue at high speeds. Excess paste will absorb heat energy and slow gelatinization of the paste. It will not dry after being exposed in the drying tunnel. A large amount of water will not be able to be piled. Overflow, return to the cardboard when cooled, make the cardboard soft, deformed, empty drum degumming.
A. Increasing the temperature of the drying cylinder will cause the corrugated sheet and the base paper and the base paper to be pasted and dried without sticking. The crystallization occurs and the bonding is not firm.
B. Increasing the amount of borax and caustic soda brings additional costs. In the turnaround and use of paperboard, the moisture absorption will be increased, the finished paperboard will be softened and deformed, and the printed product yield will be reduced.
C. Adjusting the formula and increasing the amount of starch can increase the bonding strength, but controlling the temperature and solid content is also difficult to obtain between cost and efficiency.
Traditional methods and recipes for making paste have been difficult to adapt to today's needs.
The solution is nothing more than the use of higher quality starch, improved adhesive formulations, adjustment of equipment status, such as lowering the speed, adjusting dryer and drying tunnel temperature, to find a process more suitable for the company's existing equipment, but With little success, the normal production order also does not allow large amounts of paper and manpower to allow the production line to make long-term corrections.
Adding other agents in the starch paste to improve its performance is currently the most convenient and effective way. The TD-515 corrugated board waterproof additive developed and produced by Changzhou Tianyuan Chemicals Company can completely avoid the hollowing and degumming of cardboard, enhance the adhesion, make the paperboard smoother and firmer, and greatly improve the yield of paperboard and printing products. No need to add personnel, equipment, directly into the starch paste can be mixed evenly to glue, reduce the contact angle of the adhesive and the paper, so that the initial viscosity increases, good wetting makes the bond stronger, the additive can effectively avoid the occurrence of crystallization , The unique mesh structure allows the board to be immersed in water for 24 hours without opening the glue, making the board strong against pressure and impact.