Out of temperature. U-PVC door and window extrusion molding temperature is shown in Table 1.
Table 1 U-PVC door and window extrusion molding temperature parameters

The temperature of the machine head should be strictly controlled. For example, the temperature is low, the material is not plasticized, the pressure of the extruder is increased, the molding is difficult, and the surface quality of the product is poor. The temperature is high, the shape of the product is unstable, the size is difficult to guarantee, and the molding shrinkage rate is large. .
    2 degree of vacuum. Vacuum setting is adopted, and the degree of vacuum is controlled between 0.06 and 0.08 MPa. When the degree of vacuum is low, the shaped adsorption force is insufficient, and the product size error is large; when the vacuum degree is high, the stacking material is easily blocked at the inlet of the vacuum setting die, the running resistance of the product is large, the traction load is increased, and the output is decreased.
    3 cooling. Cooled by a cooling water tank, the water temperature is 4-8 (°C. Since the profile of the profile is complicated, if the cooling effect is not good, the length of the vacuum setting device can be increased to improve the cooling effect.


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