Browse Prior Art Database

Xerographic Toner Manufacture

IP.com Disclosure Number: IPCOM000048109D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Baird, BW: AUTHOR [+3]

Abstract

Xerographic toner is size classified by the use of a cyclone separator whose exit tube duct diameter is varied to decrease the separator's efficiency so that toner particles smaller than a desired size exit the separator as waste, through the separator's top-disposed exit duct.

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Xerographic Toner Manufacture

Xerographic toner is size classified by the use of a cyclone separator whose exit tube duct diameter is varied to decrease the separator's efficiency so that toner particles smaller than a desired size exit the separator as waste, through the separator's top-disposed exit duct.

The figure shows a toner manufacturing plant which includes toner raw materials 10 and 11 which are fed to jet mill 12. The milled materials are then supplied to a coarse classifier 13 which operates to establish the limit for large size toner particles. Excessively larger particles are returned to the jet mill by way of manual valve 14 for remilling.

Large size classified toner material is now supplied to cyclone separator 15, where it is small size classified. Separator 15 includes a removable outlet tube 16 having a universal collar 17 which will accept tubes 16 of the same length, but varying diameters. As the diameter of tube 16 is increased, the efficiency (where efficiency is defined as the total fraction of incoming material retained in the coarse fraction) of the separator is purposely reduced, and small size toner particles exit the separator as waste through tube 18 which leads to a dust collector.

By the use of variable diameter outlet tubes 16 to control the toner's small size classification, the outlet tube may be located at a high point within the separator, where the toner material is more completely size-separated. This enables operation at a...