Email:sales03@tzyuno.comTaizhou Huangyan YUNO Mould Factory

Taizhou Huangyan YUNO Mould Factory

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Contact:Mrs. Young yang 
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
Fax: 0086-576-84111565

Common Defects of PET Preforms in Hot Runner Injection Molding (2)

Common Defects of PET Preforms in Hot Runner Injection Molding (2)

Defect 3: Bottle blanks become opaque by transparency

     The cause of the defect:

                            Stripping temperature is too high

     Defects processing method:

                            1. Enhanced cooling water

                            2. Extended cooling time

                            3. Change the injection time


Defect 4: Foam on the side of the preform

     The cause of the defect:

                           1. Pressure is too high

                           2. Base film gate eccentricity

     Defects processing method:

                           1. Reduce pressure

                           2. Fix the mold


Defect 5: The preform has silver lines or yellow

     The cause of the defect:

                            Plastic decomposition

     Defects processing method:

                           1. Reduce drying temperature and extend drying time

                           2. Adjust the injection speed

                           3. Reduce material temperature

                           4. Reduce heat nozzle temperature


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