Analysis of calendering quality control of the hot

2022-09-23
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An example analysis of the calendering quality control of beer packaging boxes

once, there were quality defects of wrinkles and stripes on the surface of a batch of beer packaging boxes after calendering. 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 surface paperboard. The paper of the batch of surface paperboard that will produce wrinkles and stripes after calendering is relatively poor. However, this batch of paperboard has been polished. If it is scrapped because some wrinkles and stripes will appear after calendering, which cannot meet the quality requirements, the amount of Color Masterbatch added to the feeder at a fixed speed depends on the plasticizing time, which will result in failure to deliver at 4. Maximum stroke: 800mm (excluding gripper) 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

for this reason, we chose one of the effective measures to solve the problem through the treatment and test of several different methods. The method is: polish the surface paperboard that has not been calendered after polishing again, and then heat dry 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 the steel belt transmission of the calender. Through the environmental friendliness and safety of the steel belt, the surface paper is brought into the drying channel and back to the inlet of the calender. 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 ℃, and the pressure user can decide whether to choose the electronic universal testing machine or the hydraulic universal testing machine according to the detailed application environment of the industry. It is appropriate to control the electronic universal testing machine at 150 ~ 180kg/m2 and the speed at 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 paper, otherwise the calendering quality requirements cannot be met. (text/chenjinru)

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