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Home » Plastic molding » injection molding troubleshooting flash defect

injection molding troubleshooting flash defect

January 12, 2019 by mechanicaleng blog Leave a Comment

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.

injection molding troubleshooting flash
injection molding troubleshooting flash

Post contents

  • I. Causes of flash injection molding.
  • II. Plastics injection molding troubleshooting flash defect
    • 1. Injection molding.
    • 2. Injection machine.

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 core and cavity, slider core, gas vent is too big.

+ Clamping force is small, in injection molding process. Mold will be had gap under high pressure.

+ Molding materials.

+ Injection condition is not good as pressure, speed, temperature.

+ Injection machine is not good, if this happens core and cavity must be measured first, and re-welding and re-machining.

II. Plastics injection molding troubleshooting flash defect

1. Injection molding.

+ If parting surface, ejector pin system, or slide of mold is damaged, repair the damage and remove its.

+ Check dimension of gas vent, If it is too big or depth, repair it.

+ Clean the mold before start injection molding process.

+ Increase support plate for mold.

2. Injection machine.

+ If clamping force can be increased -> we can increase clamping force.

+ Reduce holding pressure, injection speed, or molding temperature.

 

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Filed Under: Plastic molding Tagged With: injection molding troubleshooting, molding defect

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