Patent · US Expired

Twin-screw machine with screws rotatable in the same direction

US4352568A · kind A · utility

11Cited by

3References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Karl-Dieter Lohr · Alpen, DE
Martin Ullrich · Leverkusen, DE
Erhard Tresper · Krefeld, DE

Key dates

Filing date	Mar 27, 1981
Grant date	Oct 5, 1982
Priority date	—
Expiry date	Mar 27, 2001

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C48/03
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A twin-screw machine used for treatment of plastics in which the screw shafts are fitted with eccentrically arranged kneading discs, the clearance .delta. between the kneading discs and the inner wall of the machine housing being greater than the constant clearance s between the particular adjacent kneading discs, and the eccentricity e, which is in each case of like orientation, between the axis of rotation and the central point of the kneading disc being greater than zero and less than half the absolute value of the difference between the housing and disc diameters minus the clearance s.

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