The injection molding factory has to carry out the steps of mold trial before the official production of products. During the process of mold trial, there are often problems of one kind or another. This time, the ten most common problems and solutions are summarized.

1. Main runner sticking mold

The method and sequence of solving the problem:

1. Polish the main runner → 2. The nozzle coincides with the center of the mold → 3. Reduce the mold temperature → 4. Shorten the injection time → 5. Increase the cooling time → 6. Check the nozzle heating ring → 7. Polish the mold surface → 8. Check the material Is it polluted.

2. Difficulty demoulding plastic parts

The method and sequence of solving the problem:

1. Reduce injection pressure→2. Shorten injection time→3. Increase cooling time→4. Reduce mold temperature→5. Polish mold surface→6. Increase demolding slope→7. Reduce gap at insert

3. Poor dimensional stability

The method and sequence of solving the problem:

1. Change the barrel temperature→2, increase the injection time→3, increase the injection pressure→4, change the screw back pressure→5, increase the mold temperature→6, decrease the mold temperature→7, adjust the feeding amount→8, reduce Small return ratio

4. Surface ripple

The method and sequence of solving the problem:

1. Adjust the feeding amount→2. Increase the mold temperature→3. Increase the injection time→4. Increase the injection pressure→5. Increase the material temperature→6. Increase the injection speed→7. Increase the size of the runner and gate

5. Warping and deformation of plastic parts

The method and sequence of solving the problem:

1. Reduce the mold → 2, reduce the material temperature → 3, increase the cooling time → 4, reduce the injection speed → 5, reduce the injection pressure → 6, increase the screw back pressure → 7, shorten the injection time

6. Peeling and layering of plastic parts

The method and sequence of solving the problem:

1. Check the type and grade of plastic → 2. Check whether the material is contaminated → 3. Increase the mold temperature → 4. Dry the material → 5. Increase the material temperature → 6. Reduce the injection speed → 7. Shorten the gate length → 8. Reduce Small injection pressure→9. Change gate position→10. Use large-hole nozzle

Seven, silver stripe runner stick mold

The method and sequence of solving the problem:

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

8. Poor surface gloss

The method and sequence of solving the problem:

1. Material drying → 2. Check whether the material is contaminated → 3. Increase the material temperature → 4. Increase the injection pressure → 5. Increase the mold temperature → 6. Polish the mold surface → 7. Increase the size of the runner and gate

Nine, dents

The method and sequence of solving the problem:

1. Adjust the feeding amount→2. Increase the injection pressure→3. Increase the injection time→4. Decrease the material speed→5. Decrease the mold temperature→6. Increase the exhaust hole→7. Increase the size of the runner and gate→ 8. Shorten the length of the runner → 9, change the gate position → 10, reduce the injection pressure → 11, increase the screw back pressure

10. Bubbles

The method and sequence of solving the problem:

1. Material drying → 2. Reduce material temperature → 3. Increase injection pressure → 4. Increase injection time → 5. Increase mold temperature → 6. Reduce injection speed → 7. Increase screw back pressure