Common Defects of PET Preforms in Hot Runner Injection Molding (5)

Common Defects of PET Preforms in Hot Runner Injection Molding (5)

Defect 11: Bottle Gating Brushing

    The cause of the defect:

                           1. Bad insulation

                           2. Insufficient cooling

                           3. There is pressure inside the heat flow

                           4. Bad screw check

                           5. Pressure is too low

    Defects processing method:

                           1. Guarantee gate insulation

                           2. Increase cooling

                           3. Reinforce backward cable

                           4. Clean the screw

                           5. Increase pressure


Defect 12: Bending of the preform after stripping

    The cause of the defect:

                          1. Gate eccentricity

                          2. Uneven cooling

    Defects processing method:

                          1. Fix the mold

                          2. Reduce pressure

                          3. Increase the injection speed

                          4. Extended cooling

                          5. Clean waterways

                          6. Increase cooling water pressure