초록 ▼

A valve gate injection nozzle includes a valve stem for guiding molten resin to a molding area. The valve stem includes an input area for receiving the molten resin, a central area following the input area for processing the molten resin and an output area following the central area for connection o

A valve gate injection nozzle includes a valve stem for guiding molten resin to a molding area. The valve stem includes an input area for receiving the molten resin, a central area following the input area for processing the molten resin and an output area following the central area for connection of the nozzle with the molding area. The central area includes a first zone for splitting the molten resin into a plurality of streams, a second zone for mixing and homogenizing the molten resin, and a third zone for combing the plurality of streams and forming recombined molten resin for subsequent direction in a homogenized state to the output area. The nozzle further includes a nozzle body portion for enclosing the valve stem, wherein the nozzle body portion preferably includes means for heating the resin. An injection molding system incorporating this nozzle as well as a method for homogenizing molten resin are also disclosed.

대표청구항 ▼

[ What is claimed is:] [1.] An injection molding method for processing molten resin to have a substantially homogenized molecular orientation and for molding an article having substantially no weld lines, comprising the steps of:supplying molten resin to a valve gate injection nozzle having a movabl

[ What is claimed is:] [1.] An injection molding method for processing molten resin to have a substantially homogenized molecular orientation and for molding an article having substantially no weld lines, comprising the steps of:supplying molten resin to a valve gate injection nozzle having a movable valve stem;splitting said molten resin into a plurality of individual streams in a first zone of said valve stem;partially mixing a portion of said plurality of individual streams in a second zone of said valve stem downstream of the first zone while maintaining a portion of said individual streams in separate individual streams;completely mixing said plurality of individual streams and homogenizing said molten resin in a third zone of said valve stem downstream of the second zone to form a single, recombined and substantially homogenized stream of molten resin;directing said molten resin from said completely mixing step in a homogenized state to a molding area; andforming said article substantially free of weld lines from homogenized molten resin formed in said step of mixing.