Type of gate
Sprue or Direct Gates are used with single cavity moulds, generally for thick walled
parts. In this pressure control is not necessary and the gate can be enlarged to ensure ease
of filling and packing to avoid sinks.
Gates are also described by their location in the mould, for example edge gated, tab gated
or submarine gated.
1; tab gating : used where it is desirable to eliminate gate defects from the part. The
gate is located on a tab which is attached to the part and which is removed in a
finishing operation.
2; submarine (tunnel) gating : this is particularly suitable for automatic moulding
because the part automatically delegates when it is ejected from the mould.
3; edge gating : occurs at the side of the part. It is usually used with parts which are
manually finished.
Sprue or Direct Gates are used with single cavity moulds, generally for thick walled
parts. In this pressure control is not necessary and the gate can be enlarged to ensure ease
of filling and packing to avoid sinks.
Gates are also described by their location in the mould, for example edge gated, tab gated
or submarine gated.
1; tab gating : used where it is desirable to eliminate gate defects from the part. The
gate is located on a tab which is attached to the part and which is removed in a
finishing operation.
2; submarine (tunnel) gating : this is particularly suitable for automatic moulding
because the part automatically delegates when it is ejected from the mould.
3; edge gating : occurs at the side of the part. It is usually used with parts which are
manually finished.
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