1, reducing the holding pressure and increasing the cooling time;
2, increase the ejection system, increase the ejection area (pay attention to waterway interference);
3. Adjust (polish) the part of the mold core that affects the demoulding of the product.
Reason:
Because the designed wall thickness is uneven, the cooling is uneven. The thin part has cooled and solidified, and the thick part has not cooled, resulting in pit collapse! Moreover, the injection molding speed is too fast and the holding time is short, which can be avoided by overcoming the above situation. The white stripes are due to the high air humidity during the injection molding process, and the material is not dry, resulting in water vapor in the material during the injection molding process.
Extended data:
Injection molding machines for plastics have a wide variety of injection products and are widely used, especially in textile equipment and automobile manufacturing, with injection products of various shapes as accessories. Medical instruments, stationery, various containers, turnover boxes, shoes, as well as various complicated injection-molded structural parts, functional parts and special-purpose precision parts can be seen everywhere in people's daily life.
Injection molded products are widely used in transportation, packaging, post and telecommunications, communications, construction, home appliances, computers, aerospace and national defense, and have become indispensable means of production and consumer goods.
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