Hot runner manifold for thermally sensitive resins

US5762976A · kind A · utility

Inventor

• Paul Brown · Orangeville, CA

Key dates

• Filing date: Feb 6, 1996
• Grant date: Jun 9, 1998
• Expiry date: Feb 6, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C2045/2733
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A hot runner manifold and a method for making such, comprising a runner, a heating element, a sprue hole defined by said manifold and communicating with said runner at an intersection, said runner, having opposing ends, at least two nozzle drops communicating with the opposing ends of the runner at intersections, all of said intersections describing abrupt changes in direction, a runner insert sealably disposed within the manifold at each point of intersection, said insert defining a toroidal orifice, said insert having one inlet and at least one outlet, said inlet and outlet positioned to enable communication with the runner, and the orifice being free of sharp edges. The insert may be employed to change the level of flow of plastic within said manifold.