The hardness of the paperboard is still relatively good. After one day in the warehouse, the paperboard begins to soften. The softened cardboard seriously affects the physical indicators of printing and cartons, so why does this happen?
Cause Analysis
1. The amount of caustic soda in the glue is too large;
2. The overlapping stacking of offline cardboard is too high;
3. The temperature of the hot plate of the dryer is lower than 160 ℃ and the speed is too fast. The low temperature environment causes the illusion of drying. The cardboards will quickly return to soft after stacking;
4. The relative humidity of cardboard storage environment exceeds 65%.
Improve methods
1. Appropriately reduce the amount of alkali used for glue;
2. Well-shaped stacking is adopted, and the stacking height should not exceed 1.5m. If necessary, use a blower to force the ventilation to disperse the moisture in the cardboard;
3. Flexible control of the dryer speed according to the environment, temperature and paper quality, and check the quality of the cardboard at any time;
4. Strengthen the ventilation of the cardboard storage environment, and the ground can absorb moisture with quicklime powder.
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