This article is talking about the ten problems and solutions in injection mold trials. Here we go!
Common problem in mold trial 1: Main sprue sticking to the injection mold
Common problems in mold trial 2: Difficulty in mold release of plastic parts
Method and sequence to solve the problem.
- Lower the injection molding pressure
- Shorten the injection molding time
- Increase the cooling time
- Lower the mold temperature
- Polish the mold surface
- Increase the release slope
- Reduce the gap at the insert
Common problems in mold trial 3: Poor dimensional stability
Method and sequence to solve the problem.
- Change the barrel temperature
- Increase the injection time
- Increase the injection pressure
- Change the back pressure of the screw
- Increase the mold temperature
- Lower the mold temperature
- Adjust the amount of material supply
- Reduce the proportion of backing material
Common problems in mold test 4: Surface ripples
Method and sequence to solve the problem.
- Adjust the material supply quantity
- Increase the mold temperature
- Increase the injection molding time
- Increase the injection molding pressure
- Increase the material temperature
- Increase the injection molding speed
- Increase the size of sprue and gate
Common problems in mold trial 5: Warping and deformation of plastic parts
Method and sequence to solve the problem.
- Lower the mold
- Lower the material temperature
- Increase the cooling time
- Lower the injection speed
- Lower the injection pressure
- Increase the back pressure of the screw
- Shorten the injection molding time
Common problems in mold trial 6: Plastic parts delamination
Method and sequence to solve the problem.
- Check the plastic-type and level
- Check whether the material is contaminated
- Raise the mold temperature
- Dry material processing
- Raise the material temperature
- Lower the injection speed
- Shorten the gate length
- Reduce the injection molding pressure
- Change the gate position
- Use large hole nozzle
Common problem in mold trial 7: Silver wire speckle sprue sticks to the mold
Method and sequence to solve the problem.
- Lower the material temperature
- Dry material processing
- Increase the injection molding pressure
- Increase the gate size
- Check the type and level of plastic
- Check whether the plastic is contaminated
Common problems in mold trial 8: Poor surface gloss
Method and sequence to solve the problem.
- Dry material treatment
- Check whether the material is contaminated
- Increase the material temperature
- Increase the injection molding pressure
- Raise the temperature of the mold
- Polish the surface of the mold
- Increase the size of sprue and gate
Common problems in mold trial 9: Dent marks
Method and sequence to solve the problem.
- Adjust the amount of material supply
- Increase the injection molding pressure
- Increase the injection molding time
- Lower the material speed
- Lower the mold temperature
- Increase the air venting hole
- Increase the size of sprue and gate
- Shorten the sprue length
- Change the gate position
- Lower the injection pressure
- Increase the back pressure of the screw
Common problem in mold trial 10: Air bubbles
Method and sequence to solve the problem.
- Dry material treatment
- Lower the material temperature
- Increase the injection molding pressure
- Increase the injection molding time
- Increase the temperature of the mold
- Lower the injection molding speed
- Increase the back pressure of the screw
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