Analysis of the causes of bending deformation of plastic profile and related solutions for 4 times

The bending deformation of plastic profile is the most common quality failure in the extrusion process. Its severity often varies with different plastic material structure and wear degree of die. If we do not take corresponding measures to deal with it, we can not produce qualified profile products. Analysis of the causes of bending deformation of plastic profile and related solutions:

First, the premise to solve the bending deformation of plastic profile: the whole line of the extruder is concentric and levelness

Extruder, die, shaping die, tractor, before production, if not alignment, resulting in several concentric and horizontal difference between the plastic profile billet from die extrusion, from molten state to high elastic state, glass state gradually transformation process, under the action of its bending stress, bending deformation is bound to occur.

Two, the key to solve the bending deformation of plastic profile: the uneven discharge of the die

In order to deal with the uneven discharge of the die, first of all, the die should be carefully assembled before the extrusion machine is started to ensure that the mouth die shunt and infant are in the center and the clearance of each part is uniform and consistent. When fastening bolts between the die plate and the head and die, the force applied should be constant. When the extrusion is started, if uneven discharge of die is found, the die temperature should be adjusted according to the bending and deformation direction of the blank. That is to reduce the bending deformation of the billet and the temperature on the side bearing the tensile stress. If the adjustment is invalid, the die should be decomposed, assembled or repaired as the case may be. When repairing the die, according to the direction and speed of the material bias flow, the method of "blocking" and "channeling" should be used to properly repair the Angle of the parting of the die or the head of the inner wall of the die. Repair die, should be gradual, and avoid eager to succeed, repair too much. The working quality of die is closely related to the bending deformation of plastic profile. Mold working force quality is a dynamic index, which changes gradually with the length of the production cycle, The Times of changing the mold, the size of wear, the quality of maintenance and maintenance work, and is not immutable. As a plastic profile production and management personnel, in

In the daily production process, we should understand and be familiar with the work and wear characteristics of the die, pay close attention to the work quality of the die and do a good job of monitoring and recording.