Mold Base Terminology - H

Hot Runner Molds

Molds that have a melt conveying system that keeps the runner molten at all times in the mold. The method for doing this consists of a manifold (a larger piece of steel with holes that are in the center that allow the melt to be contained.) This large piece of steel referred to as a manifold is usually heated with cartridge heaters or cal rod heaters. You use the same rods in your oven at home. These heaters are controlled by the use of thermocouples hooked to controllers that turn the electricity to the heaters on or off depending on what the thermocouple signals the temperature of the block is.

Hot Runner Retainer Plate

This plate typically houses the hot runner system if the mold has been designed for one. The plate is machined with a clearance of approximately .100 of an inch all around the manifold. It will have islands of steel left standing inside the milled clearance pocket for the hot runner system to prevent the bowing of the cavity plate.

Hot Sprue Bushing

Mold Element that contains a heating element to keep the resin melt hot within the bushing. The bushing is inserted into the mold to provide a hot channel between the molding machine nozzle and the mold cavity.

Hydraulic Clamp

Used in a variety of molding and forming machines, hydraulic clamp consists of a high-speed variable hydraulic pump valving a fast cylinder. Cylinders can be single or combination units. The clamp closes the mold halves to form the part.

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