1. If the mould cavity is poorly processed, if there ar […]
1. If the mould cavity is poorly processed, if there are defects such as scratches, micropores, abrasion, roughness, etc., it will inevitably reflect on the plastic parts, so that the gloss of the plastic parts is poor. In this case, the mould should be carefully processed to make the surface of the cavity more Small roughness, if necessary, can be polished with chrome.
2. If the surface of the cavity is oily or watery, or the release agent is too much, the surface of the plastic part will be dark and dull. To do this, remove the oil and water stains in time, and use the release agent in a limited amount.
3. If the plastic part is too small, the demoulding is difficult, or the force is too large when demoulding, so that the surface gloss of the plastic part is good. In this case, the draft angle should be increased.
4. If the mould is poorly exhausted, too much gas stays in the mould, which also leads to poor gloss. To do this, check and correct the mould exhaust system.
5. If the cross-sectional area of the gate or runner is too small or abruptly changed, 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.