How can warpage of the moldings after ejection be prevented?

Possible cause:

• Irregular shrinkage due to different molding section or contour (surface)

Remedies:

• Extend cooling time
• Control temperature of two mold halves separately; cool the "hollow" side, keep the other side warm
• Install heating / cooling channels just below the mold surface
• Lower melt temperature by reducing band heater temperature, screw speed and back pressure
• Decrease mold temperature
• Use a clamping device for the moldings

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