What should be noted for injection molds

What should be noted for injection molds?

1. The shrinkage coefficient of each material is different, and plastic molds should have a reasonable shrinkage rate

2. Plastic molds must have sufficient stiffness, otherwise they will deform during mold closing and pressure holding, causing "flash"

3. If the product is ejected while opening the mold, the top needle page of the injection molding machine can be set (although some injection molding machines do not have this function)

4. Choose a reasonable demolding method, choose a reasonable position and quantity of top rods to ensure that the product is not damaged during the ejection process

5. The cooling (water passage) in plastic molds is related to factors such as product size, shape, plastic properties, and holding time

6. The plastic mold should choose a reasonable exhaust position and control the amount. Otherwise, the product will be "short of material" due to insufficient plastic injection

7. The fixing method of plastic molds and injection molding machines should be reasonable, reliable and firm, to prevent accidents caused by displacement during mold closing. They should also be easy to disassemble

8. The plastic mold moves along with the moving part of the injection molding machine without a return spring, and is connected to the top needle plate of the mold and the top needle rod of the machine (commonly known as a strong top)

9. The injection channel should be selected reasonably to ensure that the material can reach every point evenly (with equal flow paths), and there should be sufficient storage to ensure that the plastic is supplied during the shrinkage process

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