Generally, injection molded products are formed and processed through corresponding molds. After an injection molded product is formed and solidified, it is taken out from the mold cavity or core, commonly known as demoulding. Due to molding shrinkage and other reasons, plastic parts are often wrapped tightly around the core or trapped in the mold cavity. They cannot automatically come out of the mold after the mold is opened, which facilitates the separation of the injection molded products from the mold and prevents the surface of the injection molded products from being scratched during demoulding. When designing the injection mold, the inner and outer surfaces of the injection molded product must have a reasonable demoulding angle along the demoulding direction.
2: Factors affecting the draft angle of injection molded products
1) The size of the demoulding angle depends on the performance of the injection molded product and the geometry of the product, such as the height or depth of the product, wall thickness and surface condition of the cavity, such as surface roughness, processing lines, etc.
2) The draft angle of hard plastic is larger than that of soft plastic;
3) The shape of the injection molded product is more complex, or the plastic part with more molding holes requires a larger draft angle;
4) If the height of the injection molded product is larger and the hole is deeper, a smaller draft angle is required;
5) As the wall thickness of injection molded products increases, the inner hole has a greater force to wrap the core, and the draft angle should also be larger.
