Patent · US Active

Device for producing plastic pipes

US10773442B2 · kind B2 · utility

0Cited by

8References

1Claims

0Family size

Assignee

BATTENFELD-CINCINNATI GERMANY GMBH · DE

Inventors

Heinrich Dohmann · Ennigerloh, DE
Henning Stieglitz · Birkenfeld, DE

Key dates

Filing date	Jan 28, 2014
Grant date	Sep 15, 2020
Priority date	—
Expiry date	Apr 26, 2035

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2023/22
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A device produces plastic pipes by extrusion, involving an extruder, a pipe head connecting to the extruder in production direction, having a base material, mandrel, and sheath. A melt channel, formed between the mandrel and sheath in production direction, promotes flow at least at the mandrel and sheath end, the mandrel and sheath being adjustable forwards and backwards relative to one another, and the outer mandrel surface and/or the inner sheath surface at least partially having a material with greater sliding capacity than the base material. Mandrel diameter at the end conically widens or narrows, and/or the mandrel end is curved so the diameter widens, narrows, or remains constant, and the inner sheath diameter at the end conically widens, narrows, or remains constant, and/or the sheath end is curved so the diameter widens or narrows, or two further surface sections, parallel and cylindrical, extend at the mandrel and sheath end.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.