Patent · US Active

Device and method for producing a dyed and an undyed plastic melt

US12076904B2 · kind B2 · utility

0Cited by

5References

27Claims

0Family size

Assignee

COPERION GMBH · DE

Inventors

Ulrich Conrad · Elze, DE
Norbert Kern · Kandel, DE
Markus Schmudde · Murr, DE
Bernhard Stöhrer · Pleidelsheim, DE
Heiko Hornberger · Hessigheim, DE

Key dates

Filing date	Jul 27, 2017
Grant date	Sep 3, 2024
Priority date	—
Expiry date	May 21, 2040

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C2948/92828
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A device for producing a dyed plastic melt and an undyed plastic melt includes a multi-shaft screw extruder, a first metering installation, a second metering installation, and a control installation, selecting between a first operating mode for producing the dyed plastic melt and a second operating mode for producing the undyed plastic melt. The first metering installation feeds an undyed plastic material through a first infeed opening into a housing of the multi-shaft screw extruder, and the second metering installation feeds at least one dyeing agent through a second infeed opening into the housing. In order for the undyed plastic melt to be produced, the plastic material is fed exclusively via the first infeed opening such that residual dyeing agent which is still located in the second metering installation or in the region of the second infeed opening does not contaminate the undyed plastic melt.

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