The bending deformation of PVC panel profiles is a common problem in the extrusion process. The reasons are uneven discharge of the die; when cooling and shaping, the material is not sufficiently cooled, and the amount of post-shrinkage is inconsistent; equipment, and other factors.

The concentricity and levelness of the entire extruder line are the prerequisites for solving the bending deformation of PVC profiles. Therefore, whenever the mold is replaced, the concentricity and levelness of the extruder, die, setting die, water tank, etc. should be corrected. Among them, ensuring the uniform discharge of the die is the key to solving the bending of the PVC profile. Before starting the machine, the die should be carefully assembled, and the gap between each part should be consistent. Adjust the die temperature. If the adjustment is invalid, the plasticization degree of the material should be appropriately increased.

Auxiliary adjustment to adjust the vacuum degree and cooling system of the shaping die is a necessary means to solve the deformation of the PVC profile. The cooling water volume on the side of the large material that is subjected to tensile stress should be increased; the method of mechanical offset center adjustment is adopted, that is, while the production is performed, the adjustment is performed at the same time. The positioning bolts in the middle of the shaping die should be slightly adjusted in the reverse direction according to the bending direction of the profiles (this method should be used with caution, and the adjustment amount should not be too large). Paying attention to the maintenance of the mold is a good preventive measure. You should pay close attention to the working quality of the mold, and maintain and maintain the mold at any time according to the actual situation.

By taking the above measures, the bending deformation of the profiles can be eliminated, and the extruder can produce high-quality PVC profiles stably and normally.

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