How to increase the brightness of ABS injection molding products

【China Packaging News】

1. Injection mold

1. If the mold cavity is poorly processed, if there are defects such as scars, micropores, wear, roughness, etc., it will inevitably be reflected on the plastic parts, which will cause the plastic parts to have poor gloss. For this, the mold must be carefully processed to make the cavity surface more Small roughness, polished chrome if necessary.

2. If the surface of the cavity has oil stains, water stains, or too much release agent, it will make the surface of the plastic parts dark and dull. For this, the oil stains and water stains should be removed in time, and the release agent is limited.

3. If the draft is too small plastic parts, demolding difficult or release force is too large, plastic parts * good surface gloss, this, to increase the stripping slope.

4. If the mold exhaust is poor, too much gas stays in the model, which also leads to poor gloss. For this, the mold exhaust system should be checked and corrected.

5. If the cross-sectional area of ​​the gate or runner is too small or changes suddenly, the shear force acts too much when the melt flows in it, and the turbulent dynamic flow results, resulting in poor gloss. For this, the gate and runner should be appropriately increased Cross-sectional area.

Second, the 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 can be appropriately increased .

2. For thick-walled plastic parts, if the cooling is not sufficient, the surface will be hairy and the gloss is 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 not good. For this, the holding pressure and holding time should be increased.

4. If the melt temperature is too low, the fluidity is poor, and it is easy to cause poor gloss. For this, the melt temperature should be appropriately increased.

5. For plastic parts made of crystalline resin, such as PE , PP , POM, etc., uneven cooling will lead to poor gloss. For this, the cooling system should be improved to cool it evenly.

6. If the injection speed is too high, and the gate cross-sectional area is too small, the pouring product will be dark and poor gloss, for this, you can appropriately reduce the injection speed and increase the gate cross-sectional area.