First, injection mold 1. If the mold cavity is not processed well, if there are scars, micro holes, wear, roughness, etc., it will inevitably reflect on the plastic part, making the plastic part poor in gloss. In this regard, the mold must be carefully processed to make the surface of the cavity Small roughness, polishing chrome plating if necessary. 2. If the surface of the cavity has oil stains, water stains, or too much release agent, the surface of the plastic part will be dark and dull. In this regard, you should remove the oil stains and water stains in time, and limit the use of mold release agents. 3. If the demolding angle of the plastic part is too small, it is difficult to demold, or the force is too large during demolding, so that the surface gloss of the plastic part is the best. In this regard, the demolding angle of the plastic part should be increased. 4. If the mold exhaust is poor, too much gas stays in the mold, which also causes poor gloss. For this,...