What countermeasures can be taken to improve the dimensional and positional accuracy of profiles during the profile production process?

What countermeasures can be taken to improve the dimensional and positional accuracy of profiles during the profile production process?

To address the problems of large deviations in size and shape during production, a comprehensive approach is necessary. The common solutions include: 
①Adjust the rotational speed of the screw and the feeding speed to be in harmony; 
②Adjust the extrusion pressure, typically for extruding ordinary profiles, the pressure drop at the die head of a twin-screw extruder is 25-32 MPa; 
③Adjust the temperature, the temperature settings for each functional zone of a twin-screw extruder generally follow the pattern of "high - low - high - low - high", with the temperature setting for the die section being higher; 
④Adjust the vacuum suction force to ensure that each part of the mold has an appropriate suction force. If the setting of the setting vacuum is too low, it will result in insufficient adhesion to the material, leading to severe deformation or failure to form the mold, unable to guarantee the appearance quality and dimensional accuracy of the product, resulting in defective products. If the setting vacuum is too high, it will increase the traction load, sometimes even causing traction difficulties, and shorten the service life of the vacuum pump; 
⑤ Adjust the cooling efficiency, for dry-wet combined negative pressure vortex water tanks, the water tank should maintain good sealing, and a vacuum hole should be set at the water tank outlet to absorb the cooling water on the surface of the profile; 
⑥ Adjust the traction machine pressure, under the premise of ensuring the regular shape of the profile, the traction pressure can be appropriately increased to prevent the belt from slipping and the defects caused by the resistance of the mold during the shaping process; 
⑦ Adjust the traction speed, the traction speed should be slightly higher than the extrusion speed; 
⑧ Clean and repair the molds in a timely manner.
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