Good strength method of corrugated cardboard

 

1. For the corrugated base paper entering the single facer, the corrugated forming is ideal when the water content is controlled between 9% and 12%. When the water content of the corrugated base paper is higher than the above indicators, it can be solved by increasing the preheating area or reducing the speed; When the water content of the corrugated base paper is lower than the above indicators, spray can be adopted. When the single face corrugated cardboard is positively shaped on the overpass conveyor belt and the stacking distance is the same, the water content of the base paper and corrugated base paper is better adjusted, and the water content is appropriate. The number of single face corrugated cardboard stacked on the overpass should not be too large, but the double facer does not stop. When the single facer changes paper, the number of single face corrugated cardboard stacked on the overpass can be appropriately increased.

 

2. The temperature of dryer has a great influence on the water content of corrugated cardboard. The heating section of the corrugated cardboard production line is usually composed of three groups. The number of heating plates is determined by the size of the heating plates and the speed of the corrugated cardboard production line. Each group is equipped with independent control valves. In order to ensure that the moisture content of single-sided corrugated cardboard before entering the dryer is basically the same, it can be solved by adjusting the preheating area of single face corrugated cardboard on the triple preheater. The adjustment method is as follows: when the water content is too high, the preheating area increases; When the water content is too low, the preheating area decreases. www.chinacartonmachine.com

 

3. Since a large amount of heat is taken away in the production process of corrugated cardboard, part of saturated steam will become condensed water in the preheater and corrugated roller, which can usually be discharged through the steam trap. For the normal discharge of condensed water, the author suggests that the bypass pipe valve in front of the steam trap be opened every 4 hours for 3 minutes to 5 minutes to ensure the relative stability of the temperature. The corn starch adhesive is usually used to make corrugated paperboard by controlling the gluing amount. Its main components are corn starch, water, sodium hydroxide and borax. Due to the different configurations of corrugated cardboard production lines, their speeds are different, and the viscosity, concentration and gelatinization temperature of the prepared adhesive are also different. The water content of corrugated cardboard changes with the amount of glue applied. When the amount of glue is large, the water content of corrugated paperboard is large, and vice versa. For single facer and double facer, the gap between the coating roller and the limiting roller is generally 0.2mm-0.25mm; The gap between the corrugated roller and the rubber coating roller under the single-sided machine is generally 0.1mm-0.2mm; The gap between the pressing roller (contact bar) of the double-sided machine and the coating roller shall be slightly lower than the height of the single-sided corrugated cardboard by 0.05mm ~ 0.1mm. The above gap can be measured with a feeler gauge, but the two rollers should be parallel.

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