How to increase the brightness of the injection molded parts of the full solution injection molding machine

- May 28, 2019-

How to increase the brightness of the injection molded parts of the full solution injection molding machine

How to increase the brightness of injection molding machine injection molding parts, first of all, from the perspective of injection molding, there are the following points

1. If the mold cavity of the injection molding machine is poorly processed, if there are defects such as scratches, micropores, abrasion, roughness, etc., it will inevitably be reflected on the plastic parts, so that the gloss of the plastic parts is poor. In this case, the mold should be carefully processed to make the cavity surface It has a small roughness and can be polished with chrome if necessary.

2. If the surface of the cavity of the injection molding machine has oil stains, water stains, or too much release agent, the surface of the plastic parts will be dark and dull. In this case, oil and water stains should be removed in time, and the release agent should be used in a limited amount. .

3. If the plastic part is too small, the mold release is difficult, or the force is too large when the mold is released, so that the surface gloss of the plastic part is not good. To this, the mold release slope of the injection molding machine should be increased.

4. If the mold is poorly exhausted, too much gas stays in the mold, which also leads to poor gloss. In this case, the mold exhaust system should be inspected and corrected.

5. If the cross-sectional area of the gate or flow passage is too small or suddenly changes, the shear force is too large when the melt flows therein, and the turbulent flow is dynamic, resulting in poor gloss. For this, the gate and runner should be appropriately enlarged. Cross-sectional area.

Secondly, from the perspective of injection molding process

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 of the injection molding machine 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 injection molding machine 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 resin, such as PE, PP, POM, etc., if the cooling is not uniform, the gloss will be poor. For this, the injection molding machine should improve the cooling system 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 of the injection molding machine and the gate cross-sectional area can be appropriately reduced.