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Kenplas Forum ==> Injection Molding (Machine) ==> Preform Bending after Heating (Wall thickness variation)
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cause: preform bent
1.Injection core may have bent.
2.Uneven preform temperature.(UNEVEN WALLTHICKNESS)
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the preform is good the preform is bent after the last stage of heating and before blowing
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First make sure the preforms are rotated evenly while heating.
Cause: Preform off-center.
1. Poor machine condition. Check machine level, tie bar alignment;
2. Injection pressure too high;
3. Poor mold condition, contact mold maker.
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This forum published since July 03, 2002.
Renewed on June 22, 2005. |
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