The causes of parts sticking and sprue sticking are multifaceted, among which mold failure is one of the main reasons. The reasons and corresponding solutions are described as follows:   1. The surface of the mold cavity and sprue bush is rough. If there are surface defects such as gouges, nicks, scars, and dents in the mold cavity and sprue bush, the plastic parts and sprue will easily stick to the mold, resulting in difficulty in ejection. Therefore, the surface finish of the cavity and sprue should be improved as much as possible. The inner surface of the cavity should preferably be chrome-plated. When polishing, the movement direction of the polishing tool should be the same as the direction of mold filling.   2. The mold wears, is scratched or the insert clearance is too large. When the molten material produces flashing in the scratched part of the mold or in the clearances between the inserts, it can also cause difficulty in product ejection. In response, the dam...

    Due to the greatly varied market demands for molds and molded products, there are many kinds of changes and thus high requirements for us in such aspects as shape, size, material, structure and more, causing us many problems and difficulties in the production process of molds and products. How to effectively control the geometric dimensions of the mold and the product is just one of them.   For different types of molds and products, there are different control techniques and methods for dimensions control. Personally, I usually start from the following aspects.   Mold Design Control Firstly, we have to fully understand the technical requirements for the mold structure, material, hardness, and precision, etc., including whether the shrinkage rate of the plastic material is proper, and whether the 3D model of the product is complete, in a bid to perform reasonable analysis.   2. Thorough consideration should be given to various factors that may influence the ...