One-minute overview of precautions when using a calender.

  Calender machine It consists of two or more rollers arranged according to the heating method and can be classified into cold pressing and hot pressing. Cold pressing is suitable for materials that do not require heating, such as graphite films, graphite sheets, radar‑absorbing materials, shielding materials, magnetic materials, and non‑ferrous metal materials. Hot pressing employs methods including moisture‑decomposition heating, electric heating, oil heating, and electromagnetic heating. This machine presses rubber, silicone, silicone rubber, phase‑change materials, polytetrafluoroethylene, or plastics at a specified temperature to form thin films of a certain thickness and surface profile, and it can also bond fiber fabrics, canvas, or steel‑wire cord fabrics.

        Use Calender machine Nine points to note:

       1. During the commissioning and trial production of the calender, the machine speed must not exceed 60 rice / Minutes; production must not be at full capacity.

       2. New Calender machine After one month of trial operation, all lubricated components must be cleaned, the lubricating oil replaced, and the wear condition of the drive‑train components inspected; worn parts should be replaced.

       3. Calender machine After normal operation, the motor must not be subjected to prolonged overload conditions; brief overloads are permissible.

       4. During normal operation, the return oil temperature of the rolling bearing lubricant is maintained at 110°C. The copper content in the return oil should be monitored regularly; when it increases, the cause must be promptly identified and eliminated.

       5. Except in special circumstances, the emergency stop switch shall not be used. When an emergency stop is activated, the molten material on the drum surface must be cleaned after the machine has come to a complete stop. To facilitate the removal of residual material, starting and reversing are permitted (with start-up and reversal durations not exceeding…). 2min ), to avoid scratching the roll surface, only copper or bamboo tools may be used to remove the molten material.

       6. Only when material is present between the two rolls is the enterprise permitted to perform fine adjustments to the roll gap.

       7. Only when the material thickness in production is generally less than 0.2mm The shaft-crossing protection device may be used only when manufacturing the product. When adjusting the shaft-crossing analysis device, take the center of the roller’s working surface as the axis; during crossing, the two ends of the roller move in opposite directions. The shaft-crossing angle shall not exceed 1 degree , the left–right displacement should be as symmetrical and equal as possible.

       8. When materials are stored in the roller chamber, a roller pre‑tensioning device should be used. After shutdown, to prevent scratching the roller surface, first adjust the roller gap and then release the roller. It is especially important to heat and cool the roller cylinders during operation; otherwise, the rollers may deform. Once feeding has stopped, the rollers should continue to rotate, and the roller gap should be opened to… 2-3mm , before stopping, the main body of the front roller should be cooled to 80 ℃, If an emergency shutdown is required, the roller gap must be opened immediately to prevent contact with the roller surface. During normal operation, the emergency shutdown device should not be used; the lubrication circuit can only be shut down after the rollers have come to a complete stop.

       9. Four-roll Calender machine Operators should not place items such as pens or mobile phones in their jacket pockets to prevent them from falling into the roller assembly during operation, which could damage the roller surface or the product. Do not use metal objects to scrape or press on the roller surface. When pulling the film from the unwind roller to the embossing unit, be sure to pull gently from both sides and secure the upper and lower cuffs to avoid accidents.

Furthermore, after removal, the rollers must not be stored in open-air conditions. This is to prevent windblown sand and dirt from contaminating the roller surfaces, and, during winter, to avoid water inside the rollers freezing and causing damage. Typically, they should be stored in a… 5℃ When storing the above data, care must be taken to effectively prevent various forms of corrosion on the roller surface.