Flexo processor
View Patent ↗An improved flexo processor and a method of using the improved flexo processor to increase the flexibility of both the type and the size of the flexographic printing element that may be processed. The novel thermal plate processor system is capable of processing both flat and round photosensitive printing elements with only minimal changes to the system. The thermal plate processor system may also include means for exposure and post-exposure/detack in the same system.
1. A plate processor system for manufacturing a flexographic printing element, the plate processor system comprising:
a drive system;
a rotatable support couplable to the drive system;
means for securing the flexographic printing element on the rotatable support;
means for exposing imaged surfaces of the flexographic printing element to actinic radiation;
means for thermally developing the imaged and exposed surfaces of the flexographic printing element; and
optionally, means for post-exposing and detacking the flexographic printing element wherein the means for thermally developing the imaged and exposed surfaces of the flexographic printing element comprises:
a) means for softening or melting non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element;
b) at least one roll that is contactable with the imaged surface of the flexographic printing element and capable of moving over at least a portion of the imaged surface of the flexographic printing element to remove the softened or melted non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element; and
c) means for maintaining contact between the at least one roll and the imaged and exposed surface of the flexographic printing element;
wherein further, the system comprises a means for allowing the at least one roll to traverse along the length of the printing element.
2. The system according to claim 1 , wherein the flexographic printing element is a flat plate and the rotatable support is a mounting cylinder.
3. The system according to claim 2 , wherein the means for securing the flexographic printing element on the mounting cylinder are selected from the group consisting of physical clamps, magnetic clamps, vacuum, and combinations of the foregoing.
4. The system according to claim 1 , wherein the flexographic printing element is a substantially seamless photosensitive printing sleeve and the rotatable support is a mandrel.
5. The system according to claim 4 , wherein the means for securing the printing sleeve to the mandrel comprises integrally forming the printing sleeve on the mandrel.
6. The system according to claim 4 , wherein the means for securing the printing sleeve to the mandrel is an adhesive.
7. The system according to claim 1 , wherein the drive system comprises one or more spacers to couple the rotatable support to the drive system, whereby the one or more spacers allow for the use of rotatable supports of varying lengths.
8. The system according to claim 1 , comprising means for controlling the drive system, said control means comprising a microprocessor.
9. The system according to claim 8 , further comprising means for controlling the operation of at least one of the means for exposing, the means for thermally developing, and the means for post-exposure/detacking.
10. The system according to claim 9 , where the means for controlling the operation of at least one of the at least one of the means for exposing, the means for thermally developing, and the means for post-exposure/detacking further comprises one or more sensors for sensing the dimensions of the flexographic printing element and relaying information concerning the dimensions of the flexographic printing element to the drive system controller.
11. The system according to claim 1 , wherein the means for exposing the imaged surface of the flexographic printing element to actinic radiation comprise one or more ultraviolet lights.
12. The system according to claim 11 , wherein the one or more ultraviolet lights are mounted on a reciprocating carriage, and said reciprocating carriage traverses the length of the flexographic printing element as the flexographic printing element rotates in a first direction.
13. The system according to claim 1 , wherein a blotting material is positioned on at least a portion of the at least one roll, and wherein when the at least one roll contacted with the imaged surface of the flexographic printing element, non-crosslinked polymer on the imaged surface of the flexographic printing element is removed by the blotting material.
14. The system according to claim 13 , wherein the blotting material is looped under and around at least the portion of the at least one roll that contacts the imaged surface of the flexographic printing element.
15. The system according to claim 14 , wherein the blotting material is continuously supplied to the at least one roll from a remote source of the blotting material.
16. The system according to claim 14 , further comprising a rewind device to carry away the blotting material that contains the removed non-crosslinked polymer.
17. The system according to claim 1 , wherein the means for maintaining contact between the at least one heatable roll and the imaged surface of the flexographic printing element comprises an air cylinder or a hydraulic cylinder that forces the at least one heatable roll against the imaged surface of the flexographic printing element.
18. The system according to claim 1 , wherein the at least one roll rotates in a first direction and the flexographic printing element rotates in an opposite direction from the at least one roll.
19. The system according to claim 1 , wherein the means for softening or melting non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element comprises heating the at least one roll that contactable with the imaged surface of the flexographic printing element.
20. The system according to claim 1 , wherein the means for softening or melting non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element comprises positioning a heater adjacent to the imaged and exposed surface of the flexographic printing element.
21. The system according to claim 20 , wherein the heater is an infrared heater or a hot air heater.
22. The system according to claim 19 , further comprising a heater positioned adjacent to the imaged and exposed surface of the flexographic printing element to provide additional softening or melting of the non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element.
23. A method of manufacturing a flexographic printing element comprising the steps of:
a) securing the flexographic printing element on a rotatable support;
b) coupling the rotatable support to a drive system to rotate the rotatable support;
c) exposing an imaged surface of the flexographic printing element to actinic radiation to crosslink and cure the imaged surface of the flexographic printing element;
d) melting or softening non-crosslinked polymer on the imaged and exposed surface of the flexographic printing element;
e) causing contact between the imaged surface of the flexographic printing element and at least one roll;
f) rotating the at least one roll against at least a portion of the imaged surface of the flexographic printing element to removed the melted or softened non-crosslinked polymer from the imaged surface of the flexographic printing element; and
g) optionally, post-exposing and detacking the imaged and developed flexographic printing element wherein the at least one roll traverses the length of the flexographic printing element.
24. The method according to claim 23 , wherein the flexographic printing element is a flat plate and the rotatable support is a mounting cylinder.
25. The method according to claim 24 , wherein the flexographic printing element is secured to the mounting cylinder by means selected from the group consisting of physical clamps, magnetic claims, vacuum, and combinations of the foregoing.
26. The method according to claim 23 , wherein the flexographic printing element is a substantially seamless printing sleeve and the rotatable support is a mandrel.
27. The method according to claim 26 , wherein the printing sleeve is integrally formed on the mandrel.
28. The method according to claim 26 , wherein the printing sleeve is secured on the mandrel using an adhesive.
29. The method according to claim 23 , wherein the drive system comprises one or more spacers for coupling the rotatable support to the drive system, whereby rotatable supports of various lengths may be used.
30. The method according to claim 23 , wherein the one or more sources of actinic radiation comprise one or more ultraviolet lights.
31. The method according to claim 30 , wherein the one or more sources of actinic radiation traverse the length of the flexographic printing element.
32. The method according to claim 23 , wherein the at least one roll traverses the length of the flexographic printing element multiple times.
33. The method according to claim 32 , wherein the at least one roll traverses the length of the flexographic printing element in a spiral or stepwise manner.
34. The method according to claim 31 , wherein the at least one roll rotates in a first direction and the flexographic printing element rotates in an opposite direction from the at least one roll.
35. The method according to claim 31 , wherein an air cylinder or a hydraulic cylinder is used to maintain contact between the at least one roll and the imaged surface of the flexographic printing element.
36. The method according to claim 31 , wherein at least the portion of the at least one roll that is in contact with the imaged surface of the flexographic printing element is covered with a blotting material and the blotting material removes the non-crosslinked polymer from the imaged surface of the flexographic printing element.
37. The method according to claim 36 , wherein the blotting material is looped under and around at the least the portion of the at least one roll that is in contact with the imaged surface of the flexographic printing element.
38. The method according to claim 37 , wherein the blotting material is continuously fed to the at least one roll from a remote source of the blotting material.
39. The method according to claim 38 , wherein the blotting material that contains the removed non-crosslinked photopolymer is rewound onto a rewind device.
40. The method according to claim 36 , wherein the non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element is melted or softened by heating the at least one roll that contacts the imaged and exposed surface of the flexographic printing element.
41. The method according to claim 36 , wherein the non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element is melted or softened by positioning a heater adjacent to the imaged and exposed surface of the flexographic printing element.
42. The method according to claim 40 , further comprising a heater positioned adjacent to the imaged and exposed surface of the flexographic printing element to provide additional melting or softening of the non-crosslinked photopolymer.