US 12,420,291 B2
Jetting devices with flexible jetting nozzle
Gustaf Martensson, Solna (SE); and Nerijus Augustis, Stockholm (SE)
Assigned to Mycronic AB, Taby (SE)
Appl. No. 17/793,242
Filed by Mycronic AB, Taby (SE)
PCT Filed Jan. 28, 2021, PCT No. PCT/EP2021/051911
§ 371(c)(1), (2) Date Jul. 15, 2022,
PCT Pub. No. WO2021/151971, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2050072-4 (SE), filed on Jan. 28, 2020.
Prior Publication US 2023/0058541 A1, Feb. 23, 2023
Int. Cl. B05B 1/08 (2006.01); B05B 9/04 (2006.01); B05C 5/02 (2006.01)
CPC B05B 1/086 (2013.01) [B05B 9/0413 (2013.01); B05C 5/0225 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A device configured to jet one or more droplets of a viscous medium, the device comprising:
a housing having one or more housing inner surfaces at least partially defining a jetting chamber configured to hold the viscous medium;
a flexible jetting nozzle, the flexible jetting nozzle having a flexible jetting nozzle inner surface at least partially exposed to the jetting chamber, the flexible jetting nozzle including a flexible conduit extending between a flexible jetting nozzle inlet orifice in the flexible jetting nozzle inner surface to a flexible jetting nozzle outlet orifice in a flexible jetting nozzle outer surface; and
an impacting device including an impact end surface at least partially defining the jetting chamber, the impacting device being configured to build up a rapid pressure impulse in the jetting chamber such that the rapid pressure impulse:
causes an increase of an internal pressure of the viscous medium in the jetting chamber to cause at least a portion of the flexible jetting nozzle to deform, to cause a cross-sectional flow area of at least a portion of the flexible conduit to dilate, and to force the one or more droplets of the viscous medium through the flexible conduit and through the flexible jetting nozzle outlet orifice, and
causes a decrease of the internal pressure of viscous medium in the jetting chamber, to cause at least the portion of the flexible jetting nozzle to relax, to cause the cross-sectional flow area of at least the portion of the flexible conduit to contract, thereby inducing break-off of the one or more droplets,
wherein the impacting device is configured to cause the increase in the internal pressure of the viscous medium in the jetting chamber based on causing at least the impact end surface to move through at least a portion of a space at least partially defined by the one or more housing inner surfaces to reduce a volume of the jetting chamber, and
wherein the impacting device is configured to cause the decrease in the internal pressure of the viscous medium in the jetting chamber based on causing at least the impact end surface to move through at least the portion of the space to increase the volume of the jetting chamber.