What should be paid attention to in the design of the head of the plastic extrusion mold

When designing the machine head of a extrusion mold, the following points should be paid attention to:

1. The inner cavity of the machine head should be streamlined so that the material can be evenly extruded along the flow channel of the machine head, and avoid overheating and decomposition of the material due to stagnation. , the flow channel should be as smooth as possible, and the surface roughness Ra value is recommended to be 0.4μm

2. Sufficient compression ratio According to different plastic products and plastic varieties, design a head that can produce sufficient compression ratio to eliminate the joint seam caused by the shunt bracket and make the product dense.

3. Correct cross-sectional shape Due to factors such as plastic performance, pressure, density, shrinkage rate, etc., the shape of the molded cross-section of the machine head is different from the real cross-sectional shape of the product. This factor should be considered in the design, so that the mouth of the machine head The mold has a reasonable cross-sectional shape.

4. Compact rhythm, easy disassembly and assembly. Under the condition of satisfying mechanical properties, it is necessary to design a machine head with rhythmic advance, tight connection, uniform heat transfer, convenient disassembly and assembly, and no material leakage.

5. Reasonable material selection The machine head should be made of steel with corrosion resistance, friction resistance, good tensile strength and high hardness. Some also need to be chrome-plated according to the situation.

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