EP 0933142 A3 20000719 - Method for the pneumatic classification of toner
Title (en)
Method for the pneumatic classification of toner
Title (de)
Verfahren zur Windsichtung von Toner
Title (fr)
Procédé pour le tri pneumatique de toner
Publication
Application
Priority
DE 19803107 A 19980128
Abstract (en)
[origin: EP0933142A2] A rotary disc (16) distributes toner evenly over the classification rotor (8) circumference. The toner descends under gravity, being guided through the classification zone (21). A spiral controls toner residence time distribution from top to bottom of the classification zone. Toner is introduced quickly in the homogenous state at the top and resides for a longer interval in the central part of the classification zone. At the bottom it is carried away continuously. Classification air driven past the outer edge of the rotor flows at a mean velocity of 3-7 m/s. The ratio of mass flowrate of toner to volumetric airflow is held at 0.05-0.3 kg/m<3>, based on product weight. Residence time is controlled by a coaxial spiral (29) around the classification rotor. This occupies only part of the radial extent of the classification zone. Over its length, the pitch of the spiral varies. Toner mass flowrate to classification air volumetric flowrate is preferably 0.1 kg/m<3>. Mean velocity of classification air is 5 m/s.
IPC 1-7
IPC 8 full level
B07B 7/083 (2006.01); B07B 11/06 (2006.01); G03G 9/08 (2006.01); G03G 9/087 (2006.01)
CPC (source: EP)
B07B 7/083 (2013.01); B07B 11/06 (2013.01); G03G 9/0817 (2013.01)
Citation (search report)
- [XP] EP 0836893 A2 19980422 - HOSOKAWA ALPINE AG [DE]
- [A] US 4304360 A 19811208 - LUHR ROBERT J, et al
- [A] DE 4014342 A1 19911107 - JAEGER HEINZ [DE]
- [AD] DE 3915641 A1 19901115 - CANON KK [JP]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0933142 A2 19990804; EP 0933142 A3 20000719; EP 0933142 B1 20020605; AT E218399 T1 20020615; DE 19803107 A1 19990729; DE 59901580 D1 20020711; JP H11288133 A 19991019
DOCDB simple family (application)
EP 99100551 A 19990113; AT 99100551 T 19990113; DE 19803107 A 19980128; DE 59901580 T 19990113; JP 1995299 A 19990128