Ejector Systems
Some force must be applied to the moulded parts to eject them from the mould.
Mechanical knock-out devices such as pins or sleeves can be used, driven by the
movement of the mould as it opens.
With mechanical ejectors, the area of the knock-out device in contact with the part must
be large enough to avoid damaging or stressing the part.
In designing the part and the mould, side wall taper should be included to assist part
ejection. For polyethylene, a draft angle of 0.5 - 1o is recommended.
Some force must be applied to the moulded parts to eject them from the mould.
Mechanical knock-out devices such as pins or sleeves can be used, driven by the
movement of the mould as it opens.
With mechanical ejectors, the area of the knock-out device in contact with the part must
be large enough to avoid damaging or stressing the part.
In designing the part and the mould, side wall taper should be included to assist part
ejection. For polyethylene, a draft angle of 0.5 - 1o is recommended.
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