Patent ID: 6479010
Filing Date: 2002-11-12
Classification: B29C,B29L,Y10S

Abstract:
A method of blow molding an article having a rib in a molding apparatus having open and closed positions and first and second molds defining first and second interior surfaces, said first interior surface having a first surface perpendicular to said first interior surface and extending inwardly toward said second interior surface defining a recessed portion of said first interior surface, and a second surface movable between a retracted position and an extended position, and when said second surface is in said extended position said second surface being perpendicular to said first interior surface and extending inwardly toward said second interior surface, said second surface moving toward said first surface while extending and moving away from said first surface while retracting, said method comprising the steps of:extruding a thermoplastic parison substantially between said first and second molds when in said open position; closing said molding apparatus and containing said parison between said first and second molds; inflating said parison and contacting said parison with said first and second interior surfaces; extending said second surface from said retracted position to said extended position, in said extended position said second surface being perpendicular to said first interior surface and extending inwardly toward said second interior surface, said first and second surfaces pinching said thermoplastic parison therebetween and forming said rib generally perpendicular to said first interior surface and extending from said recessed portion toward said first interior surface; retracting said second surface to release said rib formed in said extending step; and opening said molding apparatus.