A batch of beer cardboard boxes faced with wrinkles and streaks after being calendered. According to the quality requirements, the appearance of the paper product should be clean, flat, free of scratches and wrinkles after calendering. Under the condition that the calendering process parameters (such as calendering temperature, pressure, speed, etc.) are unchanged, we use another batch of packaging box face cardboard to calender. . Through comparative analysis, it is believed that the reason is due to the difference in the quality of the two faceboards, and the batch of faceboards that produce wrinkles and stripes after calendering is relatively poor in paper quality. However, this batch of faceboard has been finished, if it is scrapped because it will produce some wrinkles and stripes that fail to meet the quality requirements, it will result in failure to deliver on time and greater loss of waste. And if it can be handled by appropriate remedial measures to make the calender quality meet the requirements, one can deliver on time, and the other can reduce losses.
To this end, we have selected one of the effective measures through several different methods of treatment and experiment to solve the problem. The method is: the surface board that has not been calendered after glazing is glazed again, and then heated on the calender first. The temperature of the hot baking is the same as that of the calender. Under pressure, under the condition of calender steel belt drive, put this cardboard on the surface of the steel belt at the end of the discharge port, and bring the tissue paper into the drying tunnel through the steel belt to return to the calender. This is the end. After this heat-baking, the normal calendering process is used to perform calendering (that is, one glazing and one heat-baking is added), and the wrinkles and stripes on the batch of faceboards disappear. By the way, under normal circumstances, the temperature of calendering is generally controlled at 115 ℃ ~ 120 ℃, the pressure is controlled at 150 ~ 180kg / m2, and the speed is preferably 6-10m / min. Of course, in the field operation, it should also be adjusted and mastered reasonably according to the thickness of the cardboard. It is worth noting that for the paper products to be calendered, there must be a choice in paper quality, otherwise the calender quality requirements cannot be met.
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