After the glazing, the non-calendered surface board is glazed again, and then it is heat-baked once on the calender. The temperature of the hot bake is the same as the temperature of the calendering. When the calender is hot bake, no pressure is applied. In the case of the calender belt drive, this side of the board is placed on the strip surface at the discharge end, and the strip is brought into the drying tunnel by the steel belt and returned to the calender inlet. A head. After such heat baking and then calendering (ie, adding a coating and a hot bake) in accordance with the normal calendering process, the wrinkles and stripes on the surface of the batch of cardboards have disappeared. Incidentally, under normal circumstances, the calendered temperature is generally controlled at 115 °C ~ 120 °C, the pressure is controlled at 150 ~ 180kg/m2, speed 6 ~ 10m/min is appropriate. Of course, in the on-site operation, it is also necessary to adjust and grasp the thickness of the paperboard properly. It is worth noting that, for the paper products to be calendered, there must be some choice in paper quality, otherwise the calender quality requirements cannot be achieved.