Abstract: A mold assembly is provided for use in an injection molding machine and includes a cavity plate defining a cavity adapted to receive a moldable material, and a manifold positioned behind the cavity plate. The manifold includes a passageway for guiding the flow of the moldable material to the cavity plate. A support plate is positioned adjacent the manifold and includes a rear face into which a cup shaped recess extends, a front face opposite the rear face, and a bore extending between the front face and the recess. A nozzle is provided between the passageway in the manifold and the cavity in the plate for directing the flow of material into the cavity, and a valve gate pin extends into the nozzle. The valve gate pin is movable between a forward flow-blocking position and a rearward flow-permitting position, and a cylinder unit moves the valve gate pin between these positions. The actuator includes a drop-in pneumatic actuator secured within the recess of the support plate.

Abstract: A mold section carrier assembly is provided for use in an injection stretch blow molding machine. The assembly permits highly accurate position adjustment of mold sections on the platens of the machine, and includes a back plate on which each mold section is secured, and a pair of side rails secured on opposite sides of the mold section on each back plate. A block is provided for each side rail, and includes a planer engagement surface that is parallel to and bears against an engagement surface of the rail. A force transmitting mechanism moves each block relative to the corresponding side rail in a direction that is angled relative to the engagement surfaces in order to adjust the position of the mold section relative to the platen within a plane transverse to the support surface of the machine.

Abstract: The tip of the blow core on a stretch blow molding machine is slightly smaller in diameter than the neck of the preform into which it is inserted such that during both insertion and withdrawal there is no physical contact between the core and the preform. However, when the core tip is in place within the preform and the blow surge commences, a resilient sealing ring around the core tip expands into radial contacting engagement with the preform to seal off what would otherwise be an air escape route. When the air surge terminates, the ring contracts into a dove tail gland around the core tip so as to be substantially flush with the surface of the tip, permitting the core to be withdrawn without contacting the preform.