Optimization of UV curing
View Patent ↗A system and method of preparing a flexoplate so it is suitable for the printing of high resolution patterns. The method includes controlling the curing conditions of the flexoplate, thereby controlling the properties of said flexoplate such as floor thickness, pattern cross-sectional geometry, repeatability of printed features during the printing process, and durability of the flexoplate during the printing process.
1. A method for patterning a flexoblank to form a flexoplate comprising:
curing a first surface of a flexoblank, wherein the first surface comprises a backing, wherein curing the first surface forms a floor on the first surface, and wherein curing comprises emitting ultraviolet (UV) radiation with a plurality of wavelengths between 250 nm-600 nm and a curing dosage from 0.3 J/cm 2 to 1.0 J/cm 2 ;
disposing a mask on a second surface of a flexoblank, wherein the second surface is opposite the first surface;
curing the second surface to form a pattern on the second surface, wherein curing the second surface comprise using UV light at a dosage between 5 J/cm 2 and 25 J/cm 2 ;
wherein forming the pattern comprises forming a plurality of lines, wherein the cross-section of each of the plurality of lines is one of a square, a rectangle, a triangle, and a trapezoid, wherein a plurality of valleys are formed in between each set of lines of the plurality of lines, and wherein the valley depth is between 5-20 microns.
2. The method of claim 1 , wherein each of the lines of the plurality of lines has a tip width, wherein the tip width is 1 micron-30 microns.
3. The method of claim 1 , wherein the mask is removed from the second surface of the flexoblank, and wherein the pattern formed is formed between the areas covered by the mask.
4. A method for patterning a flexoblank to form a flexoplate comprising:
curing a first surface of a flexoblank, wherein the first surface comprises a backing, wherein curing the first surface forms a floor on the first surface, and wherein curing comprises emitting ultraviolet (UV) radiation with a plurality of wavelengths between 250 nm-600 nm and a curing dosage from 0.3 J/cm 2 to 1.0 J/cm 2 ;
disposing a mask on a second surface of a flexoblank, wherein the second surface is opposite the first surface;
curing the second surface to form a pattern on the second surface using UV light at a dosage between 5 J/cm 2 and 25 J/cm 2 ; and
wherein the pattern comprises a plurality of lines, and wherein a sidewall angle of the plurality of lines is between 20°-70°.
5. The method of claim 4 , wherein the cross section of each of the plurality of lines is a triangle or a half circle.
6. The method of claim 4 , wherein the cross section of each of the plurality of lines sidewall angle is a trapezoid comprising a tip, a first angled side, a second angled side opposite the first angled side, and a tip-to-floor depth.
7. The method of claim 4 , wherein the sidewall angle is the angle formed between the tangent of the first angled side of the cross-section of each line of the plurality of lines and the top of the tip of each line of the plurality of lines.
8. The method of claim 7 , wherein curing the first surface further comprises the plurality of wavelengths between 250 nm-360 nm.
9. The method of claim 4 , wherein the sidewall angle is between 30°-50°.
10. The method of claim 4 , wherein the plurality of wavelengths is between 250 nm-360 nm.
11. The method of claim 4 , wherein a plurality of valleys are formed in between each line of the plurality of lines.
12. The method of claim 4 , wherein curing the first surface is prior to curing the second surface.
13. The method of claim 4 , wherein curing the first surface is subsequent to curing the second surface.
14. The method of claim 12 , further comprising curing the first surface again subsequent to curing the second surface.
15. A method of forming a conductive pattern using a flexoplate comprising:
patterning a flexoblank comprising a first and a second surface, to form a flexoplate wherein patterning comprises:
disposing a mask on a second surface of the flexoblank;
curing a first surface using ultraviolet light with a plurality of wavelengths between 250 nm-600 nm and a curing dosage between 0.3 J/cm 2 to 1.0 J/cm 2 , wherein curing the first surface forms a floor on the first surface,
curing the second surface using UV light at a dosage between 5 J/cm 2 and 25 J/cm 2 ;
forming, subsequent to curing the second surface, a pattern on the second surface, wherein the pattern comprises a plurality of lines with sidewall angles between 20°-70°;
disposing the patterned flexoblank on a roller;
printing a first substrate using a first ink and the flexoplate on at least one side of the substrate;
printing a second substrate on at least one side; and
plating the first and the second substrates, with a conductive material to form the conductive pattern.
16. The method of claim 15 , wherein curing the first surface further comprises using UV light with a plurality of wavelengths between 250 nm-360 nm.
17. The method of claim 15 , wherein the cross-section of each of the plurality of lines is one of a square, a rectangle, a triangle, and a trapezoid.
18. The method of claim 15 , wherein the plurality of printed lines are between 1 micron-20 microns wide.
19. The method of claim 15 , wherein the sidewall angle is the angle formed between the tangent of the first angled side of the cross-section of each line of the plurality of lines and the top of the tip of each line of the plurality of lines.
20. The method of claim 15 , wherein the sidewall angle is between 30°-50°.
21. The method of claim 15 , wherein a plurality of valleys are formed in between each line of the plurality of lines, and wherein each valley of the plurality of valleys is between 5 microns-20 microns deep.
22. The method of claim 15 , wherein a plurality of valleys are formed in between each line of the plurality of lines, and wherein each valley of the plurality of valleys is between 5 microns-700 microns deep.
23. The method of claim 15 , wherein curing the first surface comprises a first and a second curing process, wherein the first curing process of the two curing processes for curing the first surface is performed prior to curing the second surface, and wherein the second curing process is performed subsequent to curing the second surface.