Focare Mould Co.,Ltd.

Difficult Ejection - Plastic Injection Molding Defects

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Courtesy of Focare Mould Co.,Ltd.

Difficult Ejection

The plastic injection parts stick to the molds, making it rather difficult for ejection.There are mainly following causes:

Reason For Difficult Ejection

1)Shooting Technique

*Too much injection materials

*Overhigh injection pressure, overlarge dwell pressure and overlong dwell time.

*Overhigh melt temperature

*Overlow or overhigh mold temperture.

2)Molds Design & Mold Processing

*Incorrect design of draft.

*Improper design of ejector unit, incorrect position of extrusion, oversmall ejection force, no air intake device for the core resulting in vacuum during ejection.

*Rough molding surface of cavity.

Lucia 

sale3@focaremould.com 

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