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Different cooling rates lead to the formation of depressions at the connection surface, which is known as the contraction mark.
There may be one or more reasons for the formation of shrink marks. The choice of geometry and material is usually determined by the raw material supplier and is not easily changed. However, there are many factors on the mold design that may affect shrinkage.
The simple solution is to modify the conventional core hole, but it is impossible for you to apply it to all resins. In addition, gas-assisted methods are also worth a try.
Our main products: China injection molded products, plastic products, plastic processing, and other daily-use molds. With exquisite craftsmanship, good reputation and considerate service, our factory has won the praise and trust of new and old customers, and our business has spread all over the world.
