EP0213882A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Closed mixing machines
Assignee: Kobe Steel Ltd
•
Filing: 1986-08-20
•
Granted: —
•
Expires: 2006-08-20
Abstract
Abstract A closed mixing machine suitable for mixing rubber materials, comprising a closed mixing chamber and a pair of rotors received in the chamber for rotating in opposite directions, wherein the rotor tip clearance and the rotor rotation speed are increased up to values greater than typical values of the conventional mixing machine. According to this arrangement, mixing productivity is increased by a maximum of 70% with an even discharge temperature and a reduced energy consumption in comparison with a conventional arrangement.
Inventors
- 👤 Toshihiro Asai
- 👤 Katsunobu Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:45
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/02; B29B7/06; B29B7/10; B29B7/18; B29B7/183; B29B7/186; B29B7/74; B29B7/7476; B29B7/7495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A mixing machine comprising a closed mixing chamber and a pair of oppositely rotatable rotors disposed in parallel in the chamber, each rotor having at least one longer vane and at least one shorter vane, wherein : (1) the ratio a of a tip clearance ho to a rotor diameter R (ho/R) is given by 0.015<α<0.04; (2) the rotation speed of the rotors is in the range 70 - 250 rpm; (3) the ratio of the speed of one rotor to that of the other is in the range 1.0 - 1.2; (4) the rotor length/diameter ratio is in the range 1.2 - 2.2; (5) the rotor inclusion angle is in the range 15° - 35°; (6) the rotor vane length ratio Ls/L1 is in the range 0.1 - 0.48; (7) the helix angle 31 is in the range 20° -45°, and (8) the helix angle ϑs is in the range 0° - 45°, where Ls is the length of the longer vane, ϑs is the helix angle of the shorter vane, and 81 is the helix angle of the longer vane.
Claim 2
Dependent Claim
182 words
A mixing machine comprising a closed mixing chamber and a pair of oppositely rotatable rotors disposed in parallel in the chamber, each rotor having at least one longer vane and at least one shorter vane, wherein : (1) the ratio a of a tip clearance ho to a rotor diameter R (ho/R) is given by 0.015<α<0.04; (2) the rotation speed of the rotors is in the range 70 - 250 rpm; (3) the ratio of the speed of one rotor to that of the other is in the range 1.0 - 1.2; (4) the rotor length/diameter ratio is in the range 1.2 - 2.2; (5) the rotor inclusion angle is in the range 15° - 35°; (6) the rotor vane length ratio Ls/L1 is in the range 0.1 - 0.48; (7) the helix angle 31 is in the range 20° -45°, and (8) the helix angle ϑs is in the range 0° - 45°, where Ls is the length of the longer vane, ϑs is the helix angle of the shorter vane, and 81 is the helix angle of the longer vane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.