Forming a perforate membrane by laser drilling and a subsequent electro-polishing step

A method of forming a perforate membrane ( 1 ) is disclosed for use in a liquid transport device. The membrane has at least plural nozzles ( 10 ) formed therethrough. Each of those nozzles has a throat portion ( 12 ) opening at opposite end through opposite surface ( 2 ') of the perforate membr...

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Bibliographische Detailangaben
1. Verfasser:	BLAKEY DAVID MARK
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL ATOMISING APPARATUS BLASTING CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COMBINED OPERATIONS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES HEATING LIGHTING MACHINE TOOLS MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY NOZZLES OTHER WORKING OF METAL PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS SEPARATION SOLDERING OR UNSOLDERING SPRAYING APPARATUS SPRAYING OR ATOMISING IN GENERAL SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL TRANSPORTING UNIVERSAL MACHINE TOOLS WEAPONS WELDING WORKING BY LASER BEAM WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OFELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKESTHE PLACE OF A TOOL
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Beschreibung
Zusammenfassung:	A method of forming a perforate membrane ( 1 ) is disclosed for use in a liquid transport device. The membrane has at least plural nozzles ( 10 ) formed therethrough. Each of those nozzles has a throat portion ( 12 ) opening at opposite end through opposite surface ( 2 ') of the perforate membrane and a smoothly curved outwardly diverging portion ( 11 ) extending from the first end of the throat portion to the first surface ( 2 ) of the perforate membrane. Laser energy is applied selectively to the first surface ( 2 ) of the membrane in the form of a pulsed, focused beam to form the nozzles ( 10 ) and thereafter the first surface ( 2 ) of the membrane and the surface of the diverging portion ( 11 ) of the nozzles ( 10 ) are electro-polished to remove surface imperfections. The electro-polishing is controlled so as to remove material from the surface of the diverging portion ( 11 ) of the nozzles to a depth less than the length of the throat portion ( 12 ).