Paste degumming refers to the fact that the cardboard is subjected to a small external force after it is produced from the automatic thread. The surface tile is completely or partially detached from the cardboard. The reason for this phenomenon is mainly due to the adhesive quality, temperature and speed, and the performance of the base paper. Caused.
Effect of adhesive degumming In the foregoing, we have talked about the effect of adhesive on the thickness and adhesion of paperboard. The same adhesive has a direct impact on degumming.
Firstly, an excessively high viscosity of the adhesive will increase the amount of glue applied per unit area of ​​the paperboard. This will result in a thicker bond zone between the paperboard and the paperboard. Relatively speaking, the penetration of the surface between the two layers of paperboard. Smaller, resulting in degumming; the other hand, if the viscosity is too small, will produce a sticky effect of the free binding of starch molecules, so that the adhesive tape becomes thinner, can also cause degumming.
Second, the gelatinization temperature of the binder can also cause degumming. If the gelatinization temperature is high, the paperboard may not reach the gelatinization temperature at an irregular temperature and speed of the automatic double-sided machine, and the paperboard may not stick to the paperboard. Of course, the most severe degumming will occur at this time. If the gelatinization temperature is too high, the cardboard will be burned out and the adhesive effect will be destroyed. Therefore, when making the adhesive, the viscosity and temperature should be adjusted.
The influence of the speed and temperature of the automatic line on the degumming has been mentioned many times before. The speed and temperature of the automatic line have an effect on the adhesion of the cardboard. Similarly, for the degumming of the tissue paper, the speed and the temperature cannot be ignored.