The paper calender is generally used behind the dryer section of the long net machine. It is mainly used for the subsequent calendering and finishing of various papers to improve the smoothness, gloss and thickness uniformity of the paper. The paper calender is mounted on the frame vertically with respect to some small common sense of the paper calender. The next one is the motive roller, and the other rollers are frictionally driven by each other.
         Main products of paper calender: heavy duty industrial gear oil, bearing grease, hydraulic oil, etc.
         Lubrication requirements for paper calenders: Main lubrication parts: drive electric bearings, reducers, calender rolls, lifting and pressing mechanisms.
         Paper calender working conditions: moisture, high temperature, heavy load, a certain speed, even high speed, the working environment is relatively bad.

         In the operation of the paper calender, the paper sheet is in contact with the heat roller. In a short time, the heat roller transfers the heat energy into the paper and penetrates to a certain critical depth (usually considered to be 0.007 μm). The temperature reaches or approaches the softening point of the glass, at which time the plasticity of the paper surface is strengthened, and the soft roller of the paper calender is elastically deformed when pressed, and the nip is formed into surface contact. The mirrored hard roll is smooth and shiny like a stamper, and it retains a good thickness.

         Paper calender use and maintenance precautions:
         1. Check the contact surface of the roller in daily production to ensure that there is no dirt and no damage. The surface roughness of the calender roll is less than 0.5um, and the surface roughness of the heat transfer roller is less than 0.1um, that is, the mirror state.
         2. Ensure that the paper web covers the effective roll surface, and it is strictly forbidden to directly contact the soft roll and the hard roll. Otherwise, the soft roll surface will be carbonized at a high temperature, losing performance.
         3. During the heating and cooling process of the heat transfer roller, the sharp change of the temperature will cause the roller body to be in a state of thermal stress, resulting in deformation and fracture of the roller. Therefore, it is strictly forbidden to use cold water to cool the roll surface. In addition, when the downtime is long, the heat transfer roller temperature should be lowered to 60 °C to stop operation. Otherwise, the heat roller will be deformed by gravity due to excessive temperature.
         4. When the paper calender is working, it is forbidden to disassemble all kinds of oil pipes, because the hydraulic oil pressure is up to 4MPa, the oil temperature is above 100°C, and the oil will hurt people.
         5. The place where the calender rolls are stored should be dry to avoid direct sunlight and away from running electrical equipment. The ambient temperature at the storage location is preferably not less than 10 °C. The roller should be supported on the bearing seat. It is strictly prohibited to be placed directly on the ground. The roller surface should be wrapped with packaging materials. During the storage process, turn the roller at least one and a half times a month.
         6. After grinding the roller in the field, it can't work immediately after going to the workshop. It should be adapted to the on-site ambient temperature and can be put on the machine at least 24h.