10 Problems and Solutions in Mold Trial

10 Problems and Solutions in Mold Trial - DGMF Mold Clamps Co., Ltd

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

Method and order to solve the problem.

  1. To polish the main sprue
  2. Nozzle and mold center coincide
  3. Lower the mold temperature
  4. Shorten the injection molding time
  5. Increase the cooling time
  6. Check nozzle heating ring
  7. Polish the mold surface
  8. Check the material for contamination.

Common problems in mold trial 2: Difficulty in mold release of plastic parts

Method and sequence to solve the problem.

  1. Lower the injection molding pressure
  2. Shorten the injection molding time
  3. Increase the cooling time
  4. Lower the mold temperature
  5. Polish the mold surface
  6. Increase the release slope
  7. Reduce the gap at the insert

Common problems in mold trial 3: Poor dimensional stability

Method and sequence to solve the problem.

  1. Change the barrel temperature
  2. Increase the injection time
  3. Increase the injection pressure
  4. Change the back pressure of the screw
  5. Increase the mold temperature
  6. Lower the mold temperature
  7. Adjust the amount of material supply
  8. Reduce the proportion of backing material

Common problems in mold test 4: Surface ripples

Method and sequence to solve the problem.

  1. Adjust the material supply quantity
  2. Increase the mold temperature
  3. Increase the injection molding time
  4. Increase the injection molding pressure
  5. Increase the material temperature
  6. Increase the injection molding speed
  7. 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.

  1. Lower the mold
  2. Lower the material temperature
  3. Increase the cooling time
  4. Lower the injection speed
  5. Lower the injection pressure
  6. Increase the back pressure of the screw
  7. Shorten the injection molding time

Common problems in mold trial 6: Plastic parts delamination

Method and sequence to solve the problem.

  1. Check the plastic-type and level
  2. Check whether the material is contaminated
  3. Raise the mold temperature
  4. Dry material processing
  5. Raise the material temperature
  6. Lower the injection speed
  7. Shorten the gate length
  8. Reduce the injection molding pressure
  9. Change the gate position
  10. 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.

  1. Lower the material temperature
  2. Dry material processing
  3. Increase the injection molding pressure
  4. Increase the gate size
  5. Check the type and level of plastic
  6. Check whether the plastic is contaminated

Common problems in mold trial 8: Poor surface gloss

Method and sequence to solve the problem.

  1. Dry material treatment
  2. Check whether the material is contaminated
  3. Increase the material temperature
  4. Increase the injection molding pressure
  5. Raise the temperature of the mold
  6. Polish the surface of the mold
  7. Increase the size of sprue and gate

Common problems in mold trial 9: Dent marks

Method and sequence to solve the problem.

  1. Adjust the amount of material supply
  2. Increase the injection molding pressure
  3. Increase the injection molding time
  4. Lower the material speed
  5. Lower the mold temperature
  6. Increase the air venting hole
  7. Increase the size of sprue and gate
  8. Shorten the sprue length
  9. Change the gate position
  10. Lower the injection pressure
  11. Increase the back pressure of the screw

Common problem in mold trial 10: Air bubbles

Method and sequence to solve the problem.

  1. Dry material treatment
  2. Lower the material temperature
  3. Increase the injection molding pressure
  4. Increase the injection molding time
  5. Increase the temperature of the mold
  6. Lower the injection molding speed
  7. Increase the back pressure of the screw

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