Troubleshooting of post press polishing process of

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Troubleshooting of the post press polishing process of beer packaging cases

there were quality defects of wrinkles and stripes on the surface of the surface paperboard of a batch of beer packaging cases after press polishing. According to the quality requirements, the appearance of the paper after calendering should be clean, flat, free of scratches and wrinkles

under the condition that the calendering process parameters (such as calendering temperature, pressure, speed, etc.) are unchanged, we calendered another batch of packaging box surface paperboard. As a result, this batch of surface paperboard did not appear wrinkles and stripes after calendering. Through comparative analysis, it is believed that the reason is the quality difference between the two kinds of face paperboard. The tensile testing machine, which will produce wrinkles and stripes after calendering, is a common testing instrument to detect the force value. The paper of batch face paperboard is relatively poor. However, this batch of surface paperboard has been polished. If it is scrapped because some wrinkles and stripes will appear after calendering, which cannot meet the quality requirements, it will result in late delivery and large waste loss. If we can take appropriate remedial measures to make the calendering quality meet the requirements, we can deliver on time and reduce losses

therefore, we chose one of the effective measures to mislead production control through the treatment and test of several different methods, and solved the problem. The method is: polish the surface paperboard that has not been calendered after polishing again, and then heat it on the calender first. The temperature of heat drying is the same as that of calendering. When heat drying on the calender, the paperboard can be placed on the surface of the steel belt at the end of the discharge port without pressure and under the condition of steel belt transmission of the calender, and the surface paper is brought into the drying channel and returned to the feed port of the calender through the drive of the steel belt. After such hot baking and then calendering according to the normal calendering process (i.e. adding one glazing and one hot baking), the wrinkles and stripes on this batch of face paperboard disappeared

incidentally, under normal circumstances, the calendering temperature is generally controlled at 115 ℃ ~ 120 ℃, the pressure is controlled at 150 ~ 180kg/m2, and the speed is 6 10m/min. Of course, in the field operation, we should also reasonably adjust and master the thickness of the cardboard. It is worth noting that for the paper products to be calendered, there must be a choice in the paper aspect, because of sudden heat cooling, otherwise the calendering quality requirements cannot be met

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