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Pay attention to the injection moulding process

Update:12 Jan 2019
Summary:

1. If the injection speed is too small, the surface of […]

1. If the injection speed is too small, the surface of the plastic part is not dense, and the gloss is poor. For this, the injection speed can be appropriately increased.

2. For thick-walled plastic parts, if the cooling is insufficient, the surface will be hairy and the gloss will be dark. For this, the cooling system should be improved.

3. If the holding pressure is insufficient, the holding time is too short, so that the density of the plastic parts is insufficient and the gloss is poor. In this case, the holding pressure and the holding time should be increased.

4. If the melt temperature is too low, the fluidity is poor, which may lead to poor gloss. For this, the melt temperature should be appropriately increased.

5. For crystalline resins, such as PE, PP, POM, etc., if the cooling is not uniform, the gloss will be poor. For this, the cooling system should be improved to make it evenly cooled.

6. If the injection speed is too large and the gate cross-sectional area is too small, the vicinity of the cast product will be dark and the gloss is poor. For this, the injection speed and the gate cross-sectional area can be appropriately reduced.

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