Method for printing a three-dimensional structure, method for controlling a print head and printed article
The present invention relates to a method for printing a three-dimensional structure by depositing a plurality of droplets of printing material onto a substrate, wherein the substrate comprises a main plane and wherein the droplets are deposited in such a manner that layers of printing material are generated which are inclined to the main plane of the substrate.
1. A method for printing a three-dimensional structure by means of a print head having at least two ejection nozzles,
wherein a first droplet of printing material is ejected from a first ejection nozzle onto a substrate in a first step,
wherein a second droplet of printing material is ejected from the first ejection nozzle next to the deposited first droplet and a third droplet of printing material is ejected from a second ejection nozzle on top of the deposited first droplet in a second step in such a manner that the second and the third droplets merge with each other to generate a first layer of printing material.
2. The method according to claim 1 , wherein the deposited first droplet is finally or partially cured in a first curing step performed between the first step and the second step.
3. The method according to claim 2 , wherein the substrate is moved along a feeding direction during the second step.
4. The method according to claim 3 , wherein a fourth droplet is ejected from the first ejection nozzle next to the deposited second droplet and
wherein a fifth droplet is ejected from the second ejection nozzle on top of the deposited second droplet and a sixth droplet is ejected from a third ejection nozzle on top of the deposited third droplet in a third step in such a manner that the fourth, fifth and sixth droplets merge with each other to generate a second layer of printing material,
wherein the substrate is moved stepwise or continuously along the feeding direction during the third step.
5. The method according to claim 4 , wherein the deposited second and third droplets are finally or partially cured in a second curing step performed between the second step and the third step.
6. The method according to claim 5 , wherein the deposited fourth, fifth and sixth droplets are finally or partially cured in a third curing step performed after the third step,
wherein the first droplets and/or the second and third droplets are finally cured in the third curing step.
7. The method according to claim 6 , wherein the third step is repeated several times to generate a plurality of layers stacked on top of each other, wherein at least one layer is inclined to a main plane of a substrate.
8. The method according to claim 7 , wherein the print head is moved along a scanning direction during the first, second and/or third step in order to deposited a plurality of first droplets, a plurality of second droplets, a plurality of third droplets, a plurality of fourth droplets, a plurality of fifth droplets and/or plurality of sixth droplets.
9. The method according to claim 5 , wherein the first droplet is finally cured in the second curing step.
10. The method according to claim 3 , wherein the substrate is moved stepwise or continuously.