How to make corrugated cardboard more firmly bonded

The bonding strength of corrugated board depends mainly on the quality of the adhesive and the quality of the corrugated board production line

Quality of adhesive

The quality of the adhesive mainly depends on the quality of the binder and the quality of the raw material. The main raw material used in the adhesive is starch, which is usually made of corn starch. If the use of lower grade starch, because of its fine processing degree of difference, more protein, fat and other impurities will consume more caustic soda, the adhesive is not stable, adhesion of the corrugated board is easy to absorb moisture, and easy to adhesive of starch granules and impurities as the core to produce gel, poor liquidity.

Solid content, initial viscosity, viscosity and gelatinization temperature are important indicators to measure the quality of adhesive:

1 solid content

The solid content of adhesive should be determined according to the equipment precision, speed and base the actual situation, once the high-speed wide corrugated cardboard production line speed of 200 m / minute above, solid content requires the adhesive must be high, and the proportion of starch in water is usually between 3:1 - 2.5:1. The adhesive has high solid content, the moisture is relatively reduced, and the amount of glue on the corrugated board can be ensured, and the moisture content of the corrugated board can be reduced in the process of the corrugated board processing. If the enterprise equipment of low precision, slow speed, paper easy penetration, solid content of adhesive to a low point, otherwise it will cause the corrugated cardboard paste line degumming, crystallization and burst line quality problems. www.chinacartonmachine. com

2 initial adhesion

The initial adhesive force is the key to ensure the adhesion of corrugated board and improve the speed. In corrugated board production base, increase the preheating area, or in the production of adhesive crosslinking agent and respectively in the subject and carrier can increase and improve the adhesive solid content of borax, can make the adhesive coated in a relatively short period of time to produce adhesion, and the adhesive force can break the paper fiber.

3 viscosity

The lower the viscosity, the better the fluidity. The fluidity of the adhesive determines the permeability of the adhesive, the uniformity of the adhesive and the size of the glue, which directly affects the speed, the adhesion of the board, the smoothness and the strength of the board. In addition, the higher the proportion of starch in the binder, the worse the mobility; high solid content of the binder by adjusting the preparation process, but also can maintain a very low viscosity. Under normal circumstances, the use of adhesives in circulation, the viscosity of each cycle through the pump once, will be reduced. At this point, should be mixed with the new production of adhesive.

4 pasting temperature

Gelatinization temperature refers to the temperature required for the initial starch adhesive paste into the gelatinization temperature of gelatinization temperature of adhesive is a key factor to solve the problem of adhesive production of high speed, except by adjusting the amount of caustic soda and heating, appropriate to add some additives can also play the same effect. Gelatinization temperature can not be too low, otherwise it will cause the adhesive in the cycle of gelatinization and affect the mobility of the adhesive. The gelatinization temperature of the adhesive should be adjusted according to the seasonal variation, and the gelatinization temperature can be reduced to 55 to 60 DEG C in winter, and the gelatinization temperature can be increased to about 61 DEG C in summer.

Sizing quality of corrugated board production line

In Europe and the United States, the quality of corrugated box inspection, the most important thing is to check the width of the corrugated board. Sizing is the standard position is accurate, the adhesive in the corrugated peak are uniformly and smoothly smear paste glue line clear outline, and no adhesive from the horizontal projection of corrugated, no paste glue trace drag.

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