Forming a perforate membrane by laser drilling and a...

Details Forming a perforate membrane by laser drilling and a... Forming a perforate membrane by laser drilling and a...

2008-01-08

2008-01-08

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

Multiperforated metal article making

C029S890142, C029S890143, C239S596000, C239S601000, C219S121710, C205S640000, C205S641000

Reexamination Certificate

active

07316067

ABSTRACT:
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).

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