Method and apparatus for hollow core extrusion of high viscosity

Details Method and apparatus for hollow core extrusion of high viscosity Method and apparatus for hollow core extrusion of high viscosity

1989-11-13

1992-02-18

Simmons, David A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 261DIG26, 425 4C, 425209, 4253824, 425817C, 422139, 169 15, 521 74, 521917, C08J 900, B29C 4700

Patent

active

050891901

ABSTRACT:
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 having a hollow core. Initial foaming occurs in a nozzle through which the solution is dispensed to atmosphere, at a 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 of high viscosity polymeric material having a tubular shape and particularly suitable for form-in-place gasket applications.

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patent: 4060356 (1977-11-01), Schott
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patent: 4324493 (1982-04-01), Colombo
patent: 4630774 (1986-12-01), Rehman et al.
patent: 4632314 (1986-12-01), Smith et al.
patent: 4778631 (1988-10-01), Cobbs, Jr. et al.
patent: 4876051 (1989-10-01), Campbell et al.
patent: 4883420 (1989-11-01), Ozaki et al.
European Search Report dated Nov. 15, 1991.

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