Plastic Injection molding is an art form that requires skill and knowledge to produce quality products at the highest level. The production capability of a finalized design concept has become a critical need to produce long-term success in plastic injection molding. With rapid prototyping gaining popularity over the last few years, it is commonly the first step when creating new designs. This requires skilled labor to mold new parts that have less molding defects.
Flow / Weld Lines are lines or streaks in the final molded part. They can be off-color or discolored material compared to the intended color of the part. Most of the time they are caused by plastic resin cooling at different rates as it flows through the mold. They can occur where two sections meet in the mold, when the injection speed is too slow and allows the resin to cool too fast, or the wall thickness varies slightly between the sections meeting inside the mold.
Sink Marks are small indention’s or depressions that can happen in thicker areas of an injection molded part. It can occur due to shrinkage of the material when cooling time is insufficient for the material to fully cool before being removed from the molding dies. Sinks marks can also be caused by low pressure in the molding cavities or too high of a injection molding temperature at the plastic gate.
Flashing is a term used for molten plastic that escapes from the mold cavity during injection molding. Typically it escapes through the parting line between the cavities halves or ejector pin locations. The flash occurs when the molding cavity halves are not held together with enough pressure to prevent plastic from escaping the mold and cooling.
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