The more complex the shape of a resin molded product, the more weld lines tend to increase as the resin repeatedly splits and merges in the mold.
For example, for molded products with holes
If the molded product is molded with multi-point gates
Usually, when resin merges near the weld line, the orientation of molecules and fibers tends to be orthogonal to the flow direction, resulting in a decrease in material properties.
Therefore, in many cases, when products were fixed at the hole portion, they cracked at the weld line and were not as strong as expected. The countermeasures include using resin flow analysis to predict the location of weld lines at the product design stage, and using structural analysis to predict stresses applied to holes.
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