First of all, is film products in the process of the calender and its extrusion method is a moment, actually is also appear in the certain degree roller under the larger a clamping force, and products are compared, it is also can produce certain separation force, on the way, roller will actually is also a direct bearing on both ends of the bearing the cylindrical beam above.

It is for this reason that we should pay attention to the fact that it is not possible to calculate the deformation of a beam with the general bending theoretical formula, in a large way, it should pay attention to the total deflection (including bending deflection and shear deflection) formula to find a large deformation.

In actual production we will actually is also found that for roller in the middle of the total deflection, it to a large extent also is actually an allowable tolerance could be far greater than the product itself, it is because of this, we actually is also should pay attention to try to compensate, otherwise, also can not achieve products precision requirements.

Moreover, we also is to actually pay attention to because of its deflection on the central roll actually also is big, however, is also on its performance on each end of the small, it is because of this, in terms of its products by itself, in fact, that is, there will be a middle thick and thin, its terminals in view of such, for its deflection compensation method is generally will have three, including the height, preload and the preload device.

In order to eliminate the existing products in the middle on both sides of the thick and thin, we will also is actually man-made of work roll surface directly on processing has become the central diameter is larger, and its relatively small diameter on both ends of a drum-shaped, on the way, for it in the middle of the big diameter and small diameter difference on both ends, we will call it is actually is also highly E.