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   
Add: NO.28 Zhuling Northindustry , Huangyan, Taizhou city ,Zhejiang,China
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Treatment of common defects in PET preforms in hot runner injection molding (1)

Treatment of common defects in PET preforms in hot runner injection molding (1)

Defect 1: White at the bottom of the preform

  The cause of the defect:

                           1. Insufficient hot runner temperature

                           2. Insufficient material temperature

  Defects processing method:

                           1. Strengthen insulation measures

                           2. Increase the hot nozzle temperature

                           3. Appropriately increase material temperature

                           4. Speed up the injection speed

                           5. Reduce pressure

                           6. Slow down the cooling water flow rate

Defect 2: The preform is opaque

  The cause of the defect:

                          1. Insufficient drying of raw materials

                          2. Insufficient plasticization of raw materials

                          3. Excessive wall thickness or insufficient cooling of the preform

                          4. Mix in other plastics

                          5. Material temperature is too low

  Defects processing method:

                          1 guaranteed to dry for more than four hours

                          2. Increase material temperature

                          3. Increase screw speed

                          4. Check whether the temperature of the drying material is too small or the injection volume does not match. The raw material must be dried at 165 degrees until the moisture content is less than 0.2%.

                          5. Strengthen cooling and change wall thickness


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