Method and apparatus for hollow core extrusion of high viscosity materials.

摘要

A method and apparatus for dispensing a foamable, pressurized solution of a gas and a high viscosity polymeric material in a manner which produces a foamed bead (100) having a hollow core. Initial foaming (57) occurs in a nozzle (12) through which the solution is dispensed to atmosphere, at the core of the bead. Subsequent foaming of of the bead exteriorly of the core occurs outside the nozzle, and results in an extruded, foamed bead (60) of high viscosity polymeric material having a tubular shape and particularly suitable for form-in-place gasket applications.