The principle of
the design of the calender design 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 machine 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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