Brief introduction to common problems and causes of PVC profiles

- Jul 01, 2019-

The profile will encounter various problems in the process of processing, the summary is nothing more than :1. Excessive plasticization, 2. Poor plasticization, 3.


1. Surface discoloration and yellowing:


Formula stability is not enough, stabilizer and lubricant compatibility should not be, or the quality of small and medium materials unqualified formula


Mixing temperature is too high or drum, head temperature is too high




Section warping or bending:


Uneven cooling, or extrusion speed is too fast


The die, tractor and head are not in a straight line




Iii. Scratches on the surface:


Foreign body in mold or die




4. Rough surface, poor gloss and cloud appearance:


Poor plasticization, low temperature or too fast extrusion or low ACR or poor quality




5. Yellow or black lines appear on the profile surface:


1. There are stagnant materials at the confluence core or in the mold




Vi. The profiles have obvious welding wires or cracked bars:


Poor plasticizing or excessive lubrication in formula


Cooling water enters the cavity




Vii. Brittle profile:


Poor plasticization,


Excessive lubrication or excessive or insufficient stabilizers


The dosage of impact resistance modification is too low or the quality is not good




Viii. High cost and poor quality


The formula should not be compatible


There is something wrong with the small material