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molding defect

injection molding troubleshooting sink mark defect

January 14, 2019 by mechanicaleng blog Leave a Comment

plastics injection molding sink marks

Sink marks appear when thermal shrinkage of plastics material is not compensated. A sink mark usually appear at rib, boss position, or thickness of product is changed. This post I will explain about cause and sink mark troubleshooting. I. Sink mark causes. + Thickness of product is not equal, samples usually have sink marks at transfer […]

injection molding troubleshooting flash defect

January 12, 2019 by mechanicaleng blog Leave a Comment

injection molding troubleshooting flash

Injection molding troubleshooting flash defect usually appears near parting line, gas vent, slide core, or ejector pin. Burr looks like a develop film like a plastic edge. I. Causes of flash injection molding. + Material effect. For example, GF resin always have flash. It is difficult to improve flash. + Mold has gap between the […]

injection molding short shot troubleshooting

January 11, 2019 by mechanicaleng blog Leave a Comment

injection molding short shot troubleshooting

In injection molding short shot defect cause by molten plastic does not fill the cavity, product marking is incomplete. I. Cause of short shot. + Molten plastics are stick or cold in runner system. + Mold structure is not good so molten plastics can not fill in the cavity. + In injection molding process, air […]

ejector marks injection molding cause and troubleshooting

January 11, 2019 by mechanicaleng blog Leave a Comment

ejector marks injection molding

In injection molding process, ejector marks is a concave or a convex on the surface. Samples are  stick in the mold under force of ejector system, it will create holes on products. Cause of ejector mark. + Sample doesn’t have a draft angle at boss, rib. It is difficult to push sample out of the […]

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