Calender is a machine that stretches rubber or plastic to a certain thickness and surface shape at a certain temperature and can be used to hang the fiber curtain or steel cord. Usually consists of two or more rollers, arranged in a certain form. According to the number of rollers can be divided into two rollers, three rollers, four rollers and five roller calender, etc .; according to the arrangement of the roller can be divided into "L" type, "T" type, "F" Z "type and" S "type.
The principle of the design of the Calender machine is to achieve as much as possible a calendering production of qualified magnetic plates. After repeated multi-pass rolling of the magnetic plate of its internal residual stress is large, and PVC film bonding, due to the difference between the two shrinkage, there will be PVC film and magnetic degumming, magnetic plate edge exposed PVC film and magnetic plate is not flat And so on. Through the calculation and experimental correction, we determined the production of less than 1000mm width of the magnetic plate calender the best technical parameters: Roll aspect ratio of 2.5 to 3, the height of the roll diameter of 0.1 to 0.3 ‰, roll line speed ≤ 3.5 M / min, roll surface temperature 60 ~ 80 ℃, speed ratio of 1: 1, and equipped with scraping device, roller surface temperature and roll gap display device.
There are different views on the roll ratio selection, and it is believed that the shearing force of a roll with a smaller speed ratio (eg, 1: 1.03) facilitates further plasticization of the pellets during calendering. In fact, this plasticization is extremely small, but because of the roll of the shear caused by the magnetic surface of the magnetic plate caused by rubbing and the expansion of small defects.
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