초록 ▼

Improved method and apparatus for injection molding particularly useful with multiple hot runner valve gates to fill a single large mold cavity. A hot runner injection nozzle is provided having a gate through which melt is injected into a mold cavity, and a valve stem is movable on the injection noz

Improved method and apparatus for injection molding particularly useful with multiple hot runner valve gates to fill a single large mold cavity. A hot runner injection nozzle is provided having a gate through which melt is injected into a mold cavity, and a valve stem is movable on the injection nozzle between an open position permitting flow of melt through the gate and a closed position blocking the flow of melt through the gate. The valve stem is movable to at least one position between the open and closed positions restricting the flow of melt through the valve gate.

대표청구항 ▼

[ What is claimed is:] [1.]1. Process for injection molding, which comprises:injecting melt through a valve gate of a hot runner injection nozzle into a mold cavity;moving a valve stem in said injection nozzle between an open position permitting flow of melt through said gate and a closed position b

[ What is claimed is:] [1.]1. Process for injection molding, which comprises:injecting melt through a valve gate of a hot runner injection nozzle into a mold cavity;moving a valve stem in said injection nozzle between an open position permitting flow of melt through said gate and a closed position blocking flow of melt through said gate; andholding the valve stem at least at one position between the open and closed positions via an adjustable stop means during flow of said melt through said gate to restrict the flow of melt through said gate;including moving the valve stem between the open and closed positions by a double acting air piston, blocking movement of the valve stem by said stop means, and moving said stop means with a motor means separate from said air piston bidirectionally in relation to said valve stem to set said at least one position at any predetermined position between the open and closed positions.