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Cause And Prevention Of Short Shot In Injection Molding
News

Cause And Prevention Of Short Shot In Injection Molding

2024-12-03

Causes of Short Shots

1.Improper setting of injection molding parameters

  • Insufficient injection pressure: Injection pressure that is too low may result in the plastic being unable to overcome the mold’s flow resistance and be unable to completely fill the mold.
  • Injection speed is too slow: Injection speed that is too slow may cause the plastic to cool during the filling process, reducing fluidity and making it impossible to fill the mold.

2.Mold design issues

  • Improper runner design: Improper design of runner or gate may cause poor flow of molten plastic and increase the risk of short shot.
  • Uneven mold cooling system: The cooling channel design of the mold is unreasonable, resulting in overcooling of some parts of the mold, affecting the fluidity of the plastic.

3.Material properties

  • Poor material flow: Some plastic materials have poor flow, which may cause uneven filling and thus short shots.
  • Material temperature is too low: The temperature of the molten plastic is too low and may not be fluid enough to completely fill the mold.

4.Mold is worn or damaged

  • Mold wear: Wear or damage to the mold may cause the mold gap to increase and affect the filling effect of the plastic.
  • Impurities in the mold: Impurities or residues in the mold may hinder the flow of plastic and cause short shots.

5.Insufficient Cooldown Time

  • Improper cooling time setting: Insufficient cooling time may cause the plastic to fail to fully solidify, affecting the subsequent filling process.

Effective methods to prevent short shots

1.Optimize injection molding parameters

  • Adjust injection pressure: Make sure the injection pressure is within the optimal range to avoid short shots due to insufficient pressure.
  • Control injection speed: Set the injection speed properly to ensure that the plastic can fill the mold smoothly.

2.Improved mold design

  • Runner and gate design: Optimize the design of runners and gates to ensure that the molten plastic can flow smoothly into the mold cavity and reduce flow resistance.
  • Cooling system design: Ensure that the cooling channel design of the mold is reasonable to avoid poor flow caused by local overcooling.

3.Choose the right material

  • Material fluidity: Choose a plastic material with good fluidity to ensure that it can evenly fill the mold during the injection molding process.
  • Proper temperature control: Ensure the temperature of the molten plastic is moderate to avoid short shots caused by low temperature.

4.Regular mold maintenance

  • Mold cleaning: Keep the mold clean, regularly clean the impurities and residues inside the mold to ensure the smooth progress of the injection molding process.
  • Check wear: Regularly check the wear of the mold, repair and maintain it in time to ensure the accuracy and performance of the mold.

5.Set cooldown time appropriately

  • Adjust cooling time according to material characteristics: According to the cooling rate of the material used, set the cooling time reasonably to ensure that the plastic has enough time to solidify in the mold.

Conclusion

Short shots are a common quality problem in injection molding, but they can be effectively reduced by optimizing injection molding parameters, improving mold design, selecting suitable materials, regularly maintaining molds, and setting cooling time appropriately. Through these measures, manufacturers can improve the appearance quality and functionality of products and improve overall production efficiency.