John G Seuferling

US Patent:

42808014, Jul 28, 1981

Filed:

May 30, 1979

Appl. No.:

6/043923

Inventors:

Norton C. Wheeler - Mystic CT
John G. Seuferling - Norwich CT
Simo A. O. Pennila - Rowayton CT

Assignee:

Crompton & Knowles Corporation - New York NY

International Classification:

B29D 2304
B29F 304

US Classification:

425113

Abstract:

A crosshead for extruding an annular layer of thermoplastic material about a central longitudinal axis. The crosshead comprises a die having an annular slotted die opening surrounding the axis, a transverse inlet passageway for receiving molten thermoplastic material, an annular cavity connected to the inlet passageway, an annular distribution passage connected to the annular cavity and an annular connecting passage extending from the annular distribution passage to the die opening. The annular cavity and annular distribution passage each extend radially with respect to the longitudinal axis. Two or more layers of thermoplastic material are extruded by the crosshead when it is equipped with two or more dies.