A summary of the mold design of transparent plastics

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Packaging material technology丨A summary of the mold design of transparent plastics!

In order to prevent poor backflow or uneven cooling from causing poor plastic molding, resulting in surface defects and deterioration, generally the following points should be noted when designing the mold:

1) The wall thickness should be as uniform as possible, and the draft angle should be large enough;

2) The transition part should be gradual. Smooth transition to prevent sharp corners. Sharp edges are generated, especially PC products must not have gaps;

3) Gate. The flow channel should be as wide and short as possible, and the gate position should be set according to the shrinkage and condensation process. If necessary, a cold well should be added;

4) The mold surface should be smooth and clean, with low roughness (preferably less than 0.8);

5) Vent. The tank must be sufficient to discharge air and gases in the melt in a timely manner;

6) Except for PET, the wall thickness should not be too thin, generally not less than 1 mm.