Email:sales03@tzyuno.com Taizhou Huangyan YUNO Mould Factory

Taizhou Huangyan YUNO Mould Factory

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Mobile: 0086-18267666869
Tel: 0086-576-84055252
E-mail: sales03@tzyuno.com     18267666869@163.com   
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Treatment of common defects in PET preforms in hot runner injection molding (3)

Treatment of common defects in PET preforms in hot runner injection molding (3) 

Defect 6: Bubbles in the preform

    The cause of the defect:
                           Insufficient drying
    Defects processing method:
                           1. Strengthen drying
                           2. Increase material temperature
                           3. Reduce screw speed

Defect 7: There are irregular ring grooves in the preform
    The cause of the defect:
                          Moisture condensation in the core cavity
    Defects processing method:
                          1. Strengthen workshop drying
                          2. Increase cooling water temperature
                          3. Dry the mold

Defect 8: The preform is pulled at the gate
    The cause of the defect:
                           1. Hot runner mouth and gate different heart
                           2. Gate down buckle
                           3. Gate area too hot
    Defects processing method:
                          1. Fix the mold
                          2. Corrected gate
                          3. Extended cooling time
                          4, increase the injection speed or injection time
                          5. Enhanced gate insulation


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