Injection mould

An injection mould, the injection mould comprising:

• first and second relatively movable mould halves defining at least one mould cavity between them,
• wherein a first of the mould halves comprises a sprue through which moulding material is injected and a runner leading from the sprue to at least one gate into the or each mould cavity,
• wherein, when the mould halves are engaged one with the other, an insert is configured to project from one mould half into a corresponding recess in the other mould half at a position corresponding to the or each gate into the mould cavity, the insert having a cutting groove extending along a side surface of the insert and a second groove extending therealong spaced apart from the cutting groove, both the cutting groove and second groove opening into an end face of the insert and,
• wherein the end face is in communication with the sprue and the opposite end of the groove is in communication with the gate, the groove thereby constituting at least a part of the runner, the groove extending at an acute angle to the longitudinal axis of the insert,
• wherein the insert is configured to allow resin to travel from the second groove, over the end face, to the cutting groove, and
• wherein, as the mould halves are separated, a cutting edge of the groove is configured to travel across the gate and shear the material in the gate.