Patent ID: 11969746
Assignee: EXEL INDUSTRIES SA
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 1:
2. A method for coating at least an area of a surface by a Drop-on-Demand (DOD) method with a liquid coating material, comprising the steps of:
providing a DOD dispensing head with a plurality of nozzles arranged in a line forming a row of nozzles, each of the nozzles being individually controllable to dispense the liquid coating material;
moving the DOD dispensing head along a path over the surface, the path maintaining a constant distance between the plurality of nozzles and the surface;
wherein the path is substantially perpendicular to the line of nozzles;
wherein moving the DOD dispensing head comprises a superposition of a linear movement along the path and a rotational movement with an axis of rotation being perpendicular to the surface;
dispensing discrete amounts of the liquid coating material onto the surface through one or more of the nozzles, wherein the dispensing is triggered non-synchronously by a control unit;
wherein one or more of the plurality of nozzles is actuated at a firing frequency that is independent of the firing frequency of one or more of the other nozzles in the plurality of nozzles; and
wherein the firing frequency of at least one of the plurality of nozzles is based on a speed of the nozzle relative to the surface such that a distance between centers of drops of the liquid coating material successively dispensed by the nozzle is constant.