Water to buy depends on pressure and resistance

Extrusion process common problems:
First, degradation
PVC
Is a thermosensitive plastic, light stability is also poor, under the action of heat and light, it is easy to take off HCl
Reactions, commonly known as degradation. The result of degradation is a decrease in the strength of plastic products, discoloration, a black line,
Severe lead to loss of use of the product value. Factors that affect the degradation of PVC polymer structure, polymer material
Volume, stable system, molding temperature and so on. According to experience, PVC profiles yellow mostly because the die appears at the die, the reason is that the die channel is not reasonable or poor local polishing within the runner, there is a lag area. The PVC profiles out of the yellow line mostly appear inside the barrel paste, the main reason is the sieve (or transition sets) between the dead ends, poor material flow. Yellow line in the PVC profile was a vertical straight line, then the slack at the die exit; if the yellow line is not straight, it is mainly in the transitional sets. Formulas and raw materials also appear yellow line, it should be mainly from the mechanical structure to find the reasons to find the occurrence
Decomposition of the starting point and be excluded. If you can not find the reason from the plastic machinery structure, you should consider the formula or
There are problems in the process. Measures to avoid degradation in the following areas: