Manufacturing of high resolution conductive patterns using organometallic ink and banded anilox rolls
View Patent ↗Disclosed herein are systems methods for using ink comprising organometallics in a flexographic printing process using engraved anilox rolls to transfer ink to an impression roll that prints a pattern on a substrate. A banded anilox roll with more than one geometry and/or volume of cells may be used in these production systems and methods. The pattern printed may comprise a plurality of lines which are each from 1 micrometer-25 micrometers wide and may be part of an electronics application such as a touch screen sensor or an RF antenna that requires microscopic conductive patterns such as touch screen displays or antennas.
1. A method of making a touch sensor comprising:
flexographically printing a first pattern on a substrate including transferring ink from a first ink source by a first anilox roll to a first flexomaster, and subsequently transferring the ink from the first flexomaster to the substrate; and
flexographically printing a second pattern on a substrate including transferring ink from a second ink source by a second anilox roll to a second flexomaster, and subsequently transferring the ink from the second flexomaster to the substrate;
wherein the first flexomaster includes a first region including a first plurality of lines having line widths between 1-25 micrometers and a second region including a second plurality of lines having line widths greater than 25 micrometers; and
wherein the ink includes between 1 wt %-20 wt % organometallics and a solvent, and wherein a viscosity of the ink is from 200 cps-20000 cps,
wherein the first anilox roll is a banded anilox roll including a first section corresponding to the first region of the first flexomaster and a second section corresponding to the second region of the first flexomaster, wherein the first section includes cells having a first cell shape and a first cell volume selected to be appropriate for printing the first plurality of lines and the second section includes cells having a second cell shape and a second cell volume selected to be appropriate for printing the second plurality of lines, and wherein the first cell shape is different than the second cell shape or the first cell volume is different than the second cell volume; and
plating the first and the second patterns.
2. The method of claim 1 , wherein plating the first and the second patterns includes using a conductive material, wherein the conductive material is copper (Cu), nickel (Ni), gold (Au), silver (Ag), tin (Sn), palladium (Pd), zinc (Zn), aluminum (Al) or combinations thereof.
3. The method of claim 1 , wherein the substrate includes at least one of a polymer, a metallic film, a metallic foil, paper, organic material, and glass.
4. The method of claim 1 , wherein the ink includes between 1 wt. %-5 wt. % organometallics.
5. The method of claim 1 , wherein the solvent is at least one of isopropyl alcohol, methanol, ethyl lactate, ethylene glycol, dichloromethane, toluene, or acetic acid.
6. The method of claim 1 , wherein the ink further includes a co-solvent, wherein the co-solvent is at least one of isopropyl alcohol, methanol, ethyl lactate, ethylene glycol, dichloromethane, toluene, or acetic acid, and wherein the co-solvent is at least one of a different type or a different concentration than the solvent.
7. The method of claim 1 , wherein each line of the first plurality of lines have line widths between 1-15 micrometers.
8. The method of claim 1 , wherein each line of the first plurality of lines have line widths between 1-5 micrometers.
9. A method of making a touch sensor comprising:
flexographically printing a pattern on a substrate, including using a banded anilox roller to transfer ink from an ink source to a flexomaster, and subsequently transferring the ink from the flexomaster to the substrate; and
using a plating station to plate a conductive material onto the printed pattern on the substrate;
wherein the flexomaster includes a first region including a first plurality of lines having line widths between 1-25 micrometers and a second region including a second plurality of lines having line widths greater than 25 micrometers; and
wherein the banded anilox roll includes a first section corresponding to the first region of the flexomaster and a second section corresponding to the second region of the flexomaster, wherein the first section includes cells having a first cell shape and a first cell volume selected to be appropriate for printing the first plurality of lines and the second section includes cells having a second cell shape and a second cell volume selected to be appropriate for printing the second plurality of lines, and wherein the first cell shape is different than the second cell shape or the first cell volume is different than the second cell volume.
10. The method of claim 9 , wherein the first section of the banded anilox roll has a smaller cell volume than the second section of the banded anilox roll.