A gate is the connecting section between the runner system and the part. Gates can be
relatively large, providing full flow to the part or can be of smaller cross section than the
runner, restricting and accelerating the flow. Large gates are used to mould large thick
parts, or to avoid surface blemishes which might be caused by flow patterns from small
gates. Restricted gates are circular in cross section and are about 1.5 mm
in diameter for
most polyethylene applications. Unrestricted or large gates may be circular, but more
frequently are square or rectangular. Large gates are only used with single cavity
moulds
relatively large, providing full flow to the part or can be of smaller cross section than the
runner, restricting and accelerating the flow. Large gates are used to mould large thick
parts, or to avoid surface blemishes which might be caused by flow patterns from small
gates. Restricted gates are circular in cross section and are about 1.5 mm
in diameter for
most polyethylene applications. Unrestricted or large gates may be circular, but more
frequently are square or rectangular. Large gates are only used with single cavity
moulds
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