Improved targeting of flying insects with insecticides and...

B - Operations – Transporting – 05 – B

Patent

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Details

B05B 5/047 (2006.01) B05B 1/34 (2006.01) B05B 5/16 (2006.01) B65D 83/14 (2006.01)

Patent

CA 2294846

A method of killing flying insects which method comprises spraying into the air in which insects are flying liquid droplets of an insecticidal composition, a unipolar charge being imparted to the said liquid droplets by double layer charging and charge separation during spraying, the unipolar charge being at a level such that the said droplets have a charge to mass ratio of at least +/- 1 x 10-4 C/kg. An aerosol spray device which is capable of imparting a unipolar charge by double layer charging and charge separation to liquid droplets of a composition sprayed therefrom has a spraying head in the form of an insert in an actuator, the spraying head having a bore through which liquid is expelled having an outlet, preferably with a tortuous periphery, having an L/a ratio of at least 8, where L is the length of the periphery defining the bore outlet in mm and a is the cross-sectional area of the bore outlet in mm2 and the apparatus being constructed such that the droplets are expelled from the spraying head at a flow ratio of at least 0.5 grams per second and have a charge to mass ratio of at least +/- I x 10-4 C/kg.

On décrit un procédé pour tuer des insectes volants, qui consiste à pulvériser dans un espace contenant des insectes volants, des gouttelettes liquides d'une composition insecticide. Pendant la pulvérisation, une charge unipolaire est placée dans les gouttelettes liquides par chargement double couche et séparation de charge, ladite charge unipolaire atteignant un niveau tel que lesdites gouttelettes présentent une charge spécifique de masse d'au moins +/- 1 x 10<-4> C/kg. On décrit en outre un pulvérisateur en aérosol pouvant mettre en oeuvre un chargement double couche et une séparation de charge pour placer une charge unipolaire dans des gouttelettes liquides d'une composition pulvérisée au moyen dudit pulvérisateur. Le pulvérisateur comprend une buse de pulvérisation encastrable dans un actionneur. Le pulvérisateur comporte également un alésage à travers lequel le liquide est expulsé, un orifice de sortie munie, de préférence, d'un pourtour sinueux; il présente en outre un rapport entre L et a d'au moins 8, L étant la longueur en mm du pourtour qui délimite la sortie de l'alésage, et a étant l'aire de la superficie mouillée de la sortie de l'alésage obtenue en mm<2>. L'appareil est conçu de telle manière que les gouttelettes sont expulsées de la buse à un débit d'au moins 0,5 grammes par secondes et présentent une charge spécifique de masse d'au moins +/- 1 x 10<-4> C/kg.

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