Search International and National Patent Collections

1. (WO2002026499) DROPLET GENERATOR AND METHOD FOR GENERATION OF FLUID DROPLETS

Pub. No.:    WO/2002/026499    International Application No.:    PCT/EP2001/010415
Publication Date: Apr 4, 2002 International Filing Date: Sep 10, 2001
IPC: B41J 2/045
B41J 2/14
F04B 43/09
Applicants: PICORAPID TECHNOLOGIE GMBH
ULMKE, Hartmut
Inventors: ULMKE, Hartmut
Title: DROPLET GENERATOR AND METHOD FOR GENERATION OF FLUID DROPLETS
Abstract:
The invention relates to a droplet generator and a method for generation of fluid droplets, whereby a bipolar binary signal is applied to a polarisable transformer element and a change in the form of said transformer element, induced thereby, depending upon the polarity of the bipolar binary signal, leads to a change in the cross-section of a fluid channel, in order to induce the production of a droplet. A maximum energy input is achieved by means of the use of the bipolar binary impulse, as the fluid channel goes from an distended state into a contracted state on each impulse flank. The polarity of the bipolar binary impulse is preferably chosen such that the diameter of the fluid channel increases with the impulse duration and the ejection of the droplet begins with the falling impulse flank. The droplet volume and droplet diameter may be altered over a large range with the same droplet generator, by means of the increase in energy input, whereby an exact control may be achieved with increased long term stability and stable start-up properties.