Screw Barrel By Ningbo Haishu Keluo International Trade Co.,ltd.

The screw barrel has the conveying, melting, mixing, compression, metering and exhaust functions. It plays a very important role in the quality of plasticization. It is a key factor affecting the quality of plasticization.
There are several critical parameters which effect the quality of plasticization. Normally we choose the injection molding machine screw barrel according with the following principles:
1, screw diameter (D):
a, related to the required injection quantity: injection volume = 1 / 4 * I * D2 * S (injection stroke) * 0.85;
b, in general, screw diameter D and maximum injection pressure is inversely proportional, and proportional to the plasticizing capacity;
2, conveying section
a, to be responsible for conveying, pushing, compressing and preheating the plastic, the plastic temperature shall be guaranteed to the melting point;
b, the screw of crystalline plastics should be long (eg: POM, PA); the following by amorphous materials (such as: PS, PU , ABS), the shortest heat-sensitive (eg: PVC).
3, compression section
a, to be responsible for plastic mixing, compressing and exhausting, through this section of the raw materials shall have been almost completely melted, but not uniformly mixed completely;