Patent ID: 6450798
Filing Date: 2002-09-17
Classification: B29C

Abstract:
A runner system adapted for multiple cavity injection molding, said runner system comprising:a primary runner having a first end, a second end opposite from said first end, and defining a feed opening about midway between said first end and said second end; a first secondary runner disposed proximate to said first end of said primary runner, said first secondary runner having a first end, a second end, and defining an entrance opening about midway between said first end and said second end, said entrance opening providing communication between said first end of said primary runner and said first secondary runner; a second secondary runner disposed proximate to said second end of said primary runner, said second secondary runner having a first end, a second end, and defining an entrance opening about midway between said first end and said second end, said entrance opening providing communication between said second end of said primary runner and said second secondary runner; a plurality of tertiary turbulence inducing runners, each of said tertiary turbulence inducing runners disposed at a corresponding end of said first and second secondary runners, each said tertiary turbulence inducing runner comprising a first exit port, a second exit port opposite from said first exit port, and an inlet opening defined about midway between said first and second exit ports, said inlet opening providing communication between a respective tertiary turbulence inducing runner and a corresponding secondary runner; wherein upon introducing a flowable material into said feed opening of said primary runner under conditions suitable for injection molding, said material in said tertiary turbulence inducing runners is in a pseudo-turbulent state.