A local cooling device for a hot roller of a calender machine, comprising a high-pressure centrifugal fan, a cooler, and a blowing pipe connected to the cooler; The blowing pipe is arranged parallel to the hot roller of the calender. Multiple air vents facing the hot roller are evenly spaced on the blowing pipe. Each of the blowing pipes is equipped with a separately controlled valve. A steam water separator is installed between the cooler and the blowing pipe. This utility model controls the local pressure by controlling the temperature difference of the hot roller banner to compensate for the defect in the banner control of the calender itself. This device effectively controls the problems of paper unevenness and rewinding wrinkles, playing an important role in stabilizing product quality.



A calender is a device used to improve the glossiness of paper surfaces and is a type of calendering and polishing process. After the surface of the printed material is coated and the glossy layer is dried, if it is necessary to improve the smoothness and glossiness of the glossy layer again, it can be calendered by a calender. The glossiness of general polishing is around 65-85%, and after pressing, it can reach a glossiness of 90-95% or more. The surface hardness of the hot roller of the calender is high, and it is as smooth as a mirror. Oil or water is heated outside the machine and sent to the roller, and induction electric heating is also used. The roller surface temperature ranges from 120 degrees to 200 degrees, and can reach 230 degrees. The purpose of installing a calender at the rear of the paper machine is mainly to adjust various indicators of the paper, including smoothness, thickness, elasticity, etc. At present, high-speed paper machines with higher weight production generally have large deviations in banner weight and moisture content, which can easily cause significant thickness deviations in the paper. The thickness deviation of the banner is relatively large, which is prone to producing concave and convex marks during winding, and also prone to wrinkling during rewinding, seriously affecting the quality of the paper.