Method of using an ultrasonic spray apparatus to coat a substrate
A method to eject a fluid from a surface. The steps of the method are i.) vibrating a surface of a nozzle in a direction substantially normal to the surface and ii.) providing an amplitude of the vibration that is equal to or greater than about 120 microns.
1 . A method to eject a fluid from a surface, comprising the steps of:
a. vibrating a surface of a vibrating nozzle in a direction substantially normal to the surface and
b. providing an amplitude of the vibration that is equal to or greater than about 120 microns.
2 . The method of claim 1 , wherein the fluid is ejected towards a substrate.
3 . The method of claim 2 , wherein the substrate is edible.
4 . The method of claim 1 , wherein the surface is a portion of the surface of said vibrating nozzle.
5 . The method of claim 4 , wherein the vibrating nozzle is made to vibrate with a transducer, and wherein a power is applied to the transducer, said power operating at a frequency.
6 . The method of claim 5 , wherein the transducer is selected from the group consisting of a piezoelectric transducer and a magnetostrictive transducer.
7 . The method of claim 5 , wherein the distance between the transducer and the surface is substantially equal to or a multiple of half of a wavelength of the frequency of the power applied to the transducer.
8 . The method of claim 7 , wherein the vibrating nozzle is acoustically coupled to the transducer.
9 . The method of claim 8 , wherein a booster is acoustically coupled between the vibrating nozzle and the transducer.
10 . The method of claim 1 , wherein said fluid comprises a viscosity modifier.
11 . The method of claim 10 , wherein said viscosity modifier comprises a material selected from a group consisting of carboxylmethyl cellulose, gums, structurants and mixtures thereof.
12 . The method of claim 1 , wherein said fluid comprises a surface active material.
13 . The method of claim 12 , wherein said surface active material comprises a material selected from a group consisting of sodium laurylsulfate, tween80, non-ionic surfactant and monoglyceride, and lecithin.
14 . The method of claim 1 , wherein said fluid comprises materials selected from a group consisting of oil, glycerides, propylene glycol, water, sucrose polyesters, liquid sugars, glycerin, maltodextrin, alcohol, and mixtures thereof.
15 . The method of claim 1 , wherein said fluid has a viscosity of about 1 to about 500 cps as said fluid is delivered to said surface.
16 . The method of claim 1 , wherein the fluid comprises a flavorant.
17 . The method of claim 1 , wherein said fluid comprises solid particles from about 0 to about 70% by weight.
18 . The method of claim 1 , wherein the surface is made to vibrate with an amplitude greater than 150 microns.
19 . The method of claim 5 , wherein the vibrating nozzle shape is designed to amplify the amplitude of the transducer vibration to produce an amplitude of the surface vibration greater than 150 microns.
20 . The method of claim 19 , wherein the vibrating nozzle shape has a first end near the transducer and a second end comprising the surface, opposite to the first end, and wherein a cross-section of the vibrating nozzle near the second end is smaller than a cross-section of the vibrating nozzle near the first end.