Patent ID: 8011599
Filing Date: 2011-09-06
Classification: A01M,A61L,B05B

Abstract:
1. A method of controlling evaporation of droplets of a liquid nebulised as a spray of droplets from a liquid droplet spray device, wherein said liquid droplet spray device comprises a reservoir for containing the liquid, a perforate membrane plate, fluid interface means for feeding the liquid from the reservoir to the membrane plate, ultrasound generating means arranged to act on the supplied liquid to cause the liquid to vibrate and to be expelled as a spray of droplets through orifices of the membrane plate, and electronic control means for controlling activation of the ultrasound generating means, wherein the method comprises the steps of: (a) providing the liquid droplet spray device; (b) supplying the liquid to a space below the perforated membrane plate; (c) providing a pulsed driving signal having a period T for activating the ultrasound generating means; (d) activating the ultrasound generating means for a period of time T (e) de-activating the ultrasound generating means for a period of time T wherein T wherein T whereby an amount of unevaporated liquid that falls back on a surface surrounding the liquid droplet spray device is minimised.