First, the injection mold:
1. If the plastic mold cavity is poorly processed, if there are defects such as scratches, micropores, abrasion, roughness, etc., it will definitely be reflected on the plastic parts, so that the gloss of the plastic parts is poor. For this reason, the mold need to be processed carefully, which makes the smaller roughness of surface of the cavity. If necessary, it can be polished with chrome plated.
2. If the surface of the cavity is smeary, stained by water, or too much from the demolding, the surface of the plastic part will be dark and lackluster. To do this, remove greasy dirt and water stain, and the demolding should be limited to use.
3. If the mold is poorly ventilated and too much gas stays in the mold, it will also cause poor gloss. To check and correct the mold exhaust system.
4. If the draft angle of the plastic part is too small, the demoulding is difficult, or to much force is applied in demolding, so that the surface of the plastic part lose of luster, and the draft angle should be increased.
Second, plastic product injection molding process:
1. If the plastic injection speed is too small, the plastic surface is not dense, and the gloss is poor, so the injection speed can be appropriately increased.
2. For the rear wall 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 short, the density of the plastic parts is not enough and the gloss is poor. In this case, the holding pressure and the holding time should be increased.
4. For crystalline plastics, such as PE, PP, POM, etc., if the cooling is uneven, the gloss will be poor. For this, the cooling system should be improved to make it evenly cooled.
skype