Patent · US Active

Device for producing plastic tubes

US9969114B2 · kind B2 · utility

0Cited by

2References

19Claims

0Family size

Assignee

BATTENFELD-CINCINNATI GERMANY GMBH · DE

Inventors

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

Key dates

Filing date	Jan 28, 2014
Grant date	May 15, 2018
Priority date	—
Expiry date	Jan 28, 2034

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2827/18
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

An apparatus produces plastic tubes by extrusion with an extruder, a pipehead being attached to the extruder in production direction, having a base material with at least one mandrel and a sleeve, a melt channel between the mandrel and the sleeve, the melt channel shaped to aid flow in production direction at least at the mandrel's end and at the sleeve's end, the mandrel and sleeve being adjustable backwards and forward relatively to one another, the outer surface of the mandrel and/or the inner surface of the sleeve at least partially has a material that allows for a higher sliding quality than the base material. The outer and/or the inner surface (i) has a coating either unvaried, or whose sliding quality constantly improves, or whose sliding quality alternately improves and worsens, in the production direction, or (ii) is partially coated, or (iii) the mandrel and/or sleeve fronts are coated.

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