Design principles of extrusion plastic die:

1. The inner cavity is streamlined

In order to make the plastic melt move evenly and smoothly along the flow channel in the plastic extrusion die, the inner cavity of the plastic extrusion die should be smooth and streamlined, and the surface roughness should be less than 1.6-3.2m.

2. Satisfied compression ratio

In order to make the finished product compact and eliminate the joint seam caused by the shunt bracket, according to the difference between the finished product and the plastic product, a satisfactory compression ratio should be designed.

3. Accurate cross-sectional shape and scale

Because of the plastic physical properties, pressure, temperature and other factors caused by the mold release expansion effect, and the shrinkage effect caused by the traction effect, the cross-sectional shape and size of the molding area of the die are not the cross-sectional shape and size required by the plastic part, so the design At this time, it is necessary to compensate for the appropriate shape and size of the die, determine the size of the runner, control the molding length of the die, and obtain an accurate cross-sectional shape and size.

4. Reasonable selection of materials

The flow channel in the die touches the movable plastic melt, and wears a lot; some plastics will also generate chemical gases during the high-temperature molding process, which will corrode the flow channel.

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