In the production process of PVC pipe fittings, the poor plasticization caused by the material temperature is too low and the injection is insufficient, which is generally called cold spot.
The following introduces how to eliminate cold spots on PVC pipe fittings. Elimination of cold spots, caused by cold spots caused by excessive raw materials and PVC Pipe Fitting Mold.
① In terms of heating, the main reason is that the temperature of each zone increases every 2 to 4 degrees;
②Increase the pre-plastic pressure and flow rate. This can increase the screw speed, increase the friction between the material and the inner wall of the cylinder, and generate a lot of heat, so as to achieve the purpose of increasing the temperature of the material.
③The water circulation of the PVC Pipe Fitting Mold is uneven, and the cooling circuit can be adjusted to make all parts of the mold cool evenly and achieve the effect of eliminating cold spots.
Note: These methods have their own advantages and disadvantages. Although the temperature of the heating method is good, the material is easy to decompose at higher temperatures, resulting in bubbles, silver, red lines and other defects. It is very difficult to reduce the temperature. And the PVC Pipe Fitting Mold must be tested before it leaves the factory, to ensure the quality of the PVC Pipe Fitting.
Longxin Mold was established in 2019. The original company was established in 2006. We have been committed to the design and manufacture of pipe fitting molds for more than 15 years. Our main products are CPVC pipe fitting mold, UPVC pipe mold, PVC flared pipe mold, PPR pipe fitting mold.
Key Words: PVC pipe fitting mold, PVC pipe fitting; CPVC pipe fitting mold; UPVC pipe mold; PVC flared pipe mold; PPR pipe fitting mold
Post time: Dec-02-2021