1: Why do injection molding products have a demoulding […]
1: Why do injection molding products have a demoulding slope?
Generally, injection molded products are processed by corresponding molds. After an injection molded product is molded and cured, it is taken out from the mold cavity or core, commonly known as demolding. Due to molding shrinkage and other reasons, the plastic parts are often wrapped tightly on the core or trapped in the mold cavity. After the mold is opened, the mold cannot be automatically released, which is convenient for the injection molded product to be released from the mold and prevents the surface of the injection molded product from being scratched during demolding. 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: Influencing factors of the demolding slope of injection molding products
1) The size of the demolding angle depends on the performance of the injection molded product, the geometry of the product, for example, the height or depth of the product, the wall thickness and the surface state 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 product to be injection molded is more complex, or the plastic parts with more molding holes require a larger demoulding slope;
4) If the height of the injection molding product is larger and the hole is deeper, the smaller demolding slope is adopted;
5) The wall thickness of the injection molding product increases, the force of the inner hole to wrap the core is greater, and the draft angle should also be larger.