a) causes -Dents usually appears at the position opposite to the thickness of the product. They are the result of the shrinkage of materials. -The case of shell products hard enough to not be shrinkage, the product will form a hollow part inside. b) how to fix the dents -Change the parameters (pressure, temperature, time). -Change the plastic shrinkage coefficient smaller. -Appropriate product design: split large tendons into smaller veins, creating concave structure in the dents. -Mold design: putting the port location of the spray to or near the location of the thickened, this allows the material in it was compressed before the thin region froze and can offset more resin part.
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