Cardboard water content control of the cardboard box plays an important role in the production of corrugated paperboard. When the moisture content is low, the processed paperboard is hard, brittle and easy to burst after being packed into boxes. When the moisture is too high, the processed cardboard will appear soft, not quite, easy to collapse after the box and so on. In order to effectively control the moisture in the finished corrugated board and avoid the above situations, we must pay attention to the following issues:
If the moisture in the paperboard is too high and the temperature of the preheating roll does not meet the requirements, the steam pressure of the boiler must be increased so that the steam supplied can reach saturated steam. In general, the steam pressure should be kept at 1.1 MPa ± 0.2 MPa.
If the water content is low, it is necessary to adjust the paper guide roller to reduce the preheating area. At the same time, the single-sided on-machine spray device (wet roller) should be fully utilized to spray the base paper to increase the moisture content of the base paper to meet the standard requirements.
When the flat-plate dryers are working, they cannot stop when they have no other last resort. One-sided machine should speed up before replacing the base paper, and accumulate more paper on the bridge; the composite machine should decelerate after receiving the signal, and wait until the single-sided machine finishes the paper-feeding, and then speed up. If the equipment must be stopped in case of a failure, the conveyor felt should be raised to prevent excessive moisture loss from the board dryer.
For single-sided machines, adjust the gap between the squeegee and the squeegee. Under normal circumstances, the gap between the rubber roller and the rubber roller is 0.2mm to 0.25mm. The gap between the rubber roller and the main corrugating roller in the thermal state should be 0.02mm larger than the thickness of the corrugated paper used. For the double-sided machine, the gap between the scraper roller and the top roller is also 0.2mm to 0.25mm. The gap between the roller and the top roller should be 0.05mm to 0.1mm smaller than the height of the single-faced corrugated board. And the gap between both ends of the roller should be consistent and can be measured with a feeler gauge.
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