1. The shrinkage coefficient of each material is different, and the plastic mold should have a reasonable shrinkage rate.
2. The plastic mold should have enough rigidity, otherwise it will deform during mold closing and pressure maintaining, causing "flash".
3. If the product is ejected while opening the mold, the ejector page of the injection molding machine can be set (but some injection molding machines do not have this function).
4. Select a reasonable demoulding method, and select a reasonable position and number of ejector pins to ensure that the products are not damaged during the ejection process.
5. The cooling (water passage) in the plastic mold is related to the product size, shape, plastic property, pressure holding time and other factors.
6. Reasonable exhaust position and quantity control shall be selected for plastic mould. Otherwise, the plastic injection will be insufficient and the product will be "short of materials".
7. The fixing method of plastic mold and injection molding machine shall be reasonable, reliable and firm to prevent accidents caused by displacement during mold closing. It shall be easy to disassemble.
8. When there is no return spring, the plastic mold moves with the moving mold part along with the injection molding machine, which means that the mold ejector plate is connected with the machine ejector rod (commonly known as strong ejector).
9. The injection path shall be reasonably selected so that the materials can reach each place evenly (with the same flow path), and there shall be enough storage to ensure that the plastic is replenished during the shrinkage process.
10. The post-treatment of plastic mold materials is not required, because the plastic is soft and does not require any special requirements such as hardness, and the heat treatment process may cause mold deformation.
11. The roughness grade of the plastic mold cavity should reach "mirror level", otherwise, the product is difficult to demould, and the product is damaged due to excessive force required during product ejection. Roughness of locating pin, mold closing surface and other parts are specified in standards.
