PVC granulation extrusion process
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Hello, experts in chemistry. The problem I’m facing is as follows: the pellets produced by the PVC granulator have excellent quality and great elasticity. However, when the material goes through the extruder in the second step, the surface quality of the resulting product is very poor, and it also lacks toughness. The temperature of the granulator is around 130 degrees, while the temperature of the extruder is around 120 degrees.
It might be a problem with the heat stabilizer, or its amount is too low. Thermal decomposition occurs, and plasticity decreases.
Agree with the view on the second floor: the reasons for the issue with heat stabilizers are 1) quality problems with the heat stabilizers, and 2) insufficient amount of heat stabilizer added.
It’s probably a formula issue. Generally, if the color does not turn yellow, it is not a problem with the stabilizer
How about trying a different stabilizer? It seems like the plasticization isn’t good enough