Abstract: An apparatus for forming a moulded article includes a stationary mould core with an external threaded surface. A female mould surrounds a portion of the mould core including the threaded surface in a mould closed condition to define a mould cavity between the mould core and the female mould. Molten plastic is injected into the mould cavity to form the moulded article. A rotatable sleeve surrounds the mould core and engages with the moulded article formed in the mould cavity. The sleeve carries a gear wheel which meshes with a pinion. A rack is associated with the pinon and is moveable linearly to impart rotation of the pinion and in turn the sleeve. A lead screw on the sleeve engages a lead screw nut to cause the sleeve to displace axially along the mould core as the sleeve rotates. Lugs on the sleeve engages the moulded article and causes it to rotate with the sleeve so that the moulded article unscrews from the mould core allowing it to be ejected from the apparatus.

Abstract: A preform injection mould includes an elongate mould core cooperating with a female mould and a neck ring in a manner to define a mould cavity therebetween. An injection nozzle in the female mould allows molten plastic to be injected into the mould cavity so that a preform moulded article may be formed. The neck ring is constituted by a pair of mating halves which can be separated laterally with respect to the longitudinal axis of the mould core. A taper sleeve surrounds the mould core beneath the neck ring. The neck ring halves are secured to diametrically opposed slides to facilitate lateral separation of the neck ring. A pair of slide taper locks contact a respective one of the slides to inhibit lateral movement of the slides and to back up the neck ring when injection mould is in a mould closed position. An annular formation is formed on the upper surface of the neck ring and is accommodated by a complementary recess formed in the bottom of the female mould.