Spiral-webbed mandrel

Details Spiral-webbed mandrel Spiral-webbed mandrel

2006-07-18

2006-07-18

Del Sole, Joseph S. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

C425S382400, C425S380000, C425S467000, C425S381200

Reexamination Certificate

active

07077639

ABSTRACT:
An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar and an outer collar, and webs radially joining the inner collar and outer collar. The webs can be arranged twisted and/or offset in radial direction.

REFERENCES:
patent: 1679545 (1928-08-01), Roth
patent: 1809837 (1931-06-01), Ewart
patent: 4268239 (1981-05-01), Herrington, Jr.
patent: 29813412 (1998-07-01), None
W. Michaeli; Extrusionswerkzeuge für Kunststoffe und Kautschuk S. 156/157.

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