How to control the moisture content of corrugated board
For the control of the moisture content of corrugated board, we should focus on the following aspects.
1. The moisture content of the corrugated base paper when entering the factory should be inspected strictly in accordance with GB13023-91 standard.
2. After entering the factory, the storage temperature of corrugated base paper should be controlled at room temperature, and the relative humidity should not exceed 40%.
3. The storage of corrugated base paper should be stacked vertically, and the ground should be protected from moisture.
4. The storage time of corrugated base paper should not be too long. Controlling the temperature and temperature in the production process of corrugated board is an important condition for directly adjusting the moisture content of the corrugated base paper and ensuring the adhesive gelatinization. Therefore, when the corrugated paperboard production line is between 80 m / min and 120 m / min, the temperature generally used should be controlled between 160 ° C and 180 ° C, and the saturated steam pressure of the boiler according to its conversion should be controlled between 0.9Mpa-1.2Mpa, This can not only adjust the moisture content of corrugated base paper and single-sided corrugated board, but also ensure the gelatinization of the adhesive.
In order to ensure the strength and good adhesion of corrugated cardboard, the formation of corrugated cardboard should be adjusted according to the configuration of the corrugated cardboard production line.
1. It is most ideal for corrugated forming when the moisture content of the corrugated base paper entering the single-sided machine is controlled between 9% and 12%. When the moisture content of the corrugated base paper is higher than the above index, it can be solved by increasing the preheating area or reducing the vehicle speed; when the moisture content of the corrugated base paper is lower than the above index, it can be solved by spraying. The author believes that when the single-sided corrugated board is positive ∞ and the stacking distance is the same on the flyover conveyor belt through fast paper feeding, the moisture of the base paper and the corrugated base paper is adjusted better, and the moisture content is more appropriate. The quantity should not be too much, but in order to ensure that the double-sided machine does not stop, the number of single-sided corrugated cardboard stacked on the flyover can be increased appropriately when the single-sided machine changes paper.
2. The temperature of the dryer greatly affects the moisture content of the corrugated cardboard. The heating section of the corrugated board production line is usually composed of three groups (there are also four groups). The number of heating plates is determined by the size of the heating board and the speed of the corrugated board production line. Each group is equipped with an independent control valve. In order to ensure that the moisture content of the single-sided corrugated cardboard before entering the dryer is basically the same, it can be solved by adjusting the size of the preheating area of ​​the single-sided corrugated cardboard on the triple preheater. The adjustment method is: when the water content is too high, the preheating area increases; when the water content is too low, the preheating area decreases.
3. As the production process of corrugated cardboard packaging boxes takes away a lot of heat, a part of the saturated steam will become condensate in the preheater and corrugated roller, which can usually be discharged through the steam trap. To ensure the normal discharge of the condensate, the author recommends , Open the bypass pipeline valve in front of the steam trap every 4 hours for 3 minutes to 5 minutes to ensure a relatively stable temperature. Controlling the amount of glue to make corrugated cardboard usually uses corn starch adhesive, its main ingredients are: corn starch, water, sodium hydroxide and borax, due to the different configuration of corrugated cardboard production line, its speed is different, the prepared adhesive The viscosity, concentration, and gelatinization temperature are also different. With the amount of glue, the moisture content of corrugated cardboard also changes. When the amount of glue is large, the moisture content of corrugated cardboard is large, otherwise it is small. For the single-sided machine and double-sided machine, the gap between the glue roller and the glue-limiting roller is generally 0.2mm to 0.25mm; the gap between the corrugated roller and the glue roller under the single-sided machine is generally 0.1mm to 0.2mm; double-sided machine press The gap between the roller (touch bar) and the gumming roller should be slightly lower than the height of single-sided corrugated cardboard 0.05mm ~ 0.1mm. The above gap can be measured with feeler gauge, but the two rollers should be parallel.
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