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CONSTANT FLOW AIR INJECTOR

IP.com Disclosure Number: IPCOM000027301D
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 76K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a self-cleaning injector nozzle device useful for low pressure introduction of fluids or gases into bed of powder for the purpose of accomplishing fluidized powder coating operations. For example, as part of a carrier core coating and fusing process, metal core particles are mixed with finely divided resin powders, such as in a Munson rotary mixing machine. Conditioned air is typically injected into the mixer to effect even coating of core particles with resin powders. The air entering the mixer passes through one or more sintered metal filter elements to prevent contamination of the air source lines and to prevent leakage of the powders from the mixer. A problem associated with the use of sintered metal filters is that the filters become fouled with resin and or core powders and result in decreased air flow and require frequent filter changes and process interruptions. An improved air injector system comprises an air inlet filter which is self-cleaning. A rotating helical screw element located at the upstream side of the air flow provides desired cleaning or wiping action of air injector nozzle ports and avoids filter plugging or fouling problems. The helical screw wiper may be turned or rotated by independent means or by integral coupling with the rotational motion of the mixer housing. This self-cleaning nozzle device provides lower maintenance requirements and reduced down time compared to conventional coating processes using only sintered type filter elements. Other advantages of the self-cleaning injector nozzle system include: the ability to more closely control the air flow specifications; cost savings of previously discarded fouled filter elements; savings on maintenance time to make filter changes; and significantly increasing the acceptable material throughput capacity of the core coating and fusing process.

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XEROX DISCLOSURE JOURNAL

CONSTANT FLOW AIR INJECTOR

Proposed Frank Mawdesley U.S. C1.430/059 Classification

Int. C1. G30g 05/06

Disclosed is a self-cleaning injector nozzle device useful for low pressure introduction of fluids or gases into bed of powder for the purpose of accomplishing fluidized powder coating operations. For example, as part of a carrier core coating and fusing process, metal core particles are mixed with finely divided resin powders, such as in a Munson rotary mixing machine. Conditioned air is typically injected into the mixer to effect even coating of core particles with resin powders. The air entering the mixer passes through one or more sintered metal filter elements to prevent contamination of the air source lines and to prevent leakage of the powders from the mixer. A problem associated with the use of sintered metal filters is that the filters become fouled with resin and or core powders and result in decreased air flow and require frequent filter changes and process interruptions. An improved air injector system comprises an air inlet filter which is self-cleaning. A rotating helical screw element located at the upstream side of the air flow provides desired cleaning or wiping action of air injector nozzle ports and avoids filter plugging or fouling problems. The helical screw wiper may be turned or rotated by independent means or by integral coupling with the rotational motion of the mixer housing. This self-cleaning nozzle device pro...