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September 29, 2019

Common problems and analysis in profile production

In the production and use of PVC-U profiles, sometimes the problem of discoloration of the surface of the profile is encountered. If this problem is not analyzed and determined in time, it will often affect the produc...

September 29, 2019

Why do injection molded parts produce bubbles and vacuum bubbles?

1) Improper molding conditions
Many process parameters have a direct impact on the generation of bubbles and vacuum bubbles. If the injection pressure is too low, the injection speed is too fast, the in...

September 18, 2019

Ten elements for producing high quality plastic profiles

The production of high-quality plastic profiles requires overall optimization and organic coordination of formulas, raw materials, mixing machines, extruders, processes, molds and other factors. The function of...

September 17, 2019

Deep understanding of PVC plasticity

1. Effect of plasticization on product performance
The performance of PVC products is closely related to the degree of plasticization. The plasticization degree is not good, the products are brittle, and the mechanical properties c...

September 17, 2019

Introduction to screw knowledge parameters of single/twin screw extruder

First, there are everal important geometric parameters of a screw

1, screw diameter (D)
a). Relevant to the required injection volume:
Injection volume = 1/4 * π * D2 * S (injection stroke) * 0....

September 16, 2019

Congruent relationship between the different types of extruders and parameters of temperature and melt pressure.

The shear performance of the extruder is determined by the screw structure of the extruder. However, the quality of the extrusion and the efficiency of the...

September 16, 2019

Common problems and solutions of PVC injection molding processing for pvc foam shoes 

1, the flashing edge
(1) The mold is not tightly sealed and the mold should be repaired.
(2) The cooling rate is too slow. The cooling efficiency should be increased, and the co...

September 9, 2019

Why are PVC profiles would appear surface shrinkage?

Shrink marks
The surface shrinkage marks of PVC profiles affect the appearance of the profiles and even affect the neatness of the clear angles. I have regretted the high quality doors and windows. The following is...

September 9, 2019

PVC forming processing performance and characteristics

1. The viscous flow temperature of polyvinyl chloride is 136 ° C, and the decomposition temperature is 140 ° C, which is very close to each other. Therefore, PVC plastic processing is difficult. To this end, it is...

September 5, 2019

How to make pvc compound formula for pvc pipes

Pipe is one of the main products processed by extrusion molding.

The outstanding advantages of PVC plastic pipe: the relative density is small, equivalent to 1/4-1/7 of metal; the electrical insulation performance and chemi...

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The role of the three functional zones of the PVC extruder

March 18, 2019

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