Injection mould Notes for mold opening

Before opening the injection mold, we need to determine the product requirements. For example, what materials are used? Which supplier supplies it? Different suppliers of the same material will shrink differently. What are the requirements for parting line? What are the requirements for appearance? Do you want to etch? Or polishing?

If post-treatment is required, such as spraying, mold making should be considered. After understanding the above problems, today we will talk about the matters needing attention for injection mold opening:

1. The injection mold should select a reasonable exhaust position and control its amount. Otherwise, the product is "short of material" due to insufficient plastic injection.

2. The injection path shall be reasonably selected so that the materials can reach each place evenly (the flow path is equal), and there shall be enough storage to ensure that the plastic is replenished during the shrinkage process.

3. Select a reasonable demoulding method, select a reasonable ejector pin position and quantity, and ensure that the product will not be damaged during the ejection process.

4. The shrinkage coefficient of each material is different, and the mold should have a reasonable shrinkage rate.

Injection mould

5. The post-treatment of injection mold materials is not required, because the plastic is soft and does not need any special requirements such as hardness, and the heat treatment process may cause mold deformation.

6. Cooling (water passage) in injection mold is related to product size, shape, plastic property, pressure holding time and other factors.

7. The roughness level of the injection mold cavity should reach "mirror level", otherwise the product is difficult to demould, and the product needs too much force when ejecting, resulting in product damage. The roughness of locating pin, clamping surface and other parts are specified in the standard.

8. The injection mold should have sufficient rigidity, otherwise it will deform during clamping and pressure maintaining, causing "flash".

9. The mold and injection molding machine shall be fixed in a reasonable and reliable manner to prevent accidents caused by displacement during mold closing. It shall be easy to disassemble.

10. The mold moves with the moving part of the injection molding machine when there is no return spring. The ejector plate of the mold is connected with the ejector rod of the machine (commonly known as strong ejector).