Advanced coating apparatus and method

• US 7,192,484 B2
• Filed: 09/27/2002
• Issued: 03/20/2007
• Est. Priority Date: 09/27/2002
• Status: Expired due to Term

• Current Assignee: Surmodics Incorporated
• Original Assignee: Surmodics Incorporated
• Inventors: Chappa, Ralph A., Carlson, Mark F.
• Primary Examiner(s): Bashore; Alain L.
• Application Number:
  US10/256,349
• Publication Number:
  US 20040062875A1
• Time in Patent Office: 1,635 Days
• Field of Search: 427/425, 427/427.3, 427/2.24, 427/2.25, 427/2.28, 427/2.3, 118/320, 118/321, 118/323, 118/500, 118/501, 118/300
• US Class Current: 118/300
• CPC Class Codes: B05B 13/0207 the work being an elongated body, e.g. wire or pipe B05B13/0436, B05B13/0463 take precedence
• CPC Class Codes: B05B 13/0228 the movement of the objects being rotative B05B13/0242 takes precedence
• CPC Class Codes: B05B 13/0436 Installations or apparatus for applying liquid or other fluent material to elongated bodies, e.g. light poles, pipes B05B13/0442, B05B13/0463 take precedence
• CPC Class Codes: B05B 13/0442 Installation or apparatus for applying liquid or other fluent material to separate articles rotated during spraying operation
• CPC Class Codes: B05B 7/0807 to form intersecting jets
• CPC Class Codes: B05B 7/0861 with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets B05B7/0815 takes precedence
• CPC Class Codes: B05B 7/0869 the liquid or other fluent material being sucked or aspirated from an outlet orifice by another fluid, e.g. a gas, coming from another outlet orifice
• CPC Class Codes: B05D 1/002 the substrate being rotated
• CPC Class Codes: B05D 1/02 performed by spraying

Abstract

A coating apparatus for coating a rollable device including a device rotator having a pair of rollers and spray nozzle is described. The spray nozzle produces a spray of coating material that is directed towards a gap that is between the rollers of the pair. The majority of any spray not deposited on the rollable device during a coating process passes through the gap between the rollers.

Claims

1. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, wherein the first roller, second roller, or both first and second railers, comprise a plurality of ribs, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device having a surface to be coated is not on the pair of rollers.

2. The apparatus of claim 1 wherein the ribs have a shape that is wider proximal to the roller axis and narrower distal to the roller axis.

3. The apparatus of claim 1 wherein the spray nozzle is at an angle less than 90°

but greater than 5°

relative to either the first axis or second axis.

4. The apparatus of claim 1 wherein the first roller and second roller are simultaneously rotatable in the same direction.

5. The apparatus of claim 1 wherein the first roller and second roller have the same circumference.

6. The apparatus of claim 1 wherein a plane formed by the first axis and the second axis is horizontal.

7. The apparatus of claim 1 wherein the at least one pair of rollers is mounted on a tray.

8. The apparatus of claim 7 wherein the tray is movable.

9. The apparatus of claim 1 wherein the device rotator comprises a roller drive mechanism.

10. The apparatus of claim 9 wherein the roller drive mechanism comprises a shaft engagable with a distal portion(s) of the first roller, the second roller, or both the first and second roller.

11. The apparatus of claim 1 wherein the spray nozzle is movable.

12. The apparatus of claim 11 wherein the spray nozzle is movable in a direction parallel to the first or second axes.

13. The apparatus of claim 1 wherein the spray nozzle comprises a sonicating member.

14. The apparatus of claim 13 wherein the sonicating member includes a channel for gas flow and the spray pattern is established in pan by the gas flow.

15. The apparatus of claim 1 wherein the gap is in the range of 0.1 mm–

10 mm.

16. The apparatus of claim 15 wherein the gap is in the range of 0.1 mm–

2.5 mm.

17. The apparatus of claim 1 wherein the spray nozzle comprises a tip, the tip being a portion of the spray nozzle that is most proximal to the gap, and thee distance from the tip to the gap is in the range of 1–

15 mm.

18. The apparatus of claim 1 wherein at least 75% of the spray passes through the gap when the rollable device is not positioned on the rollers.

19. The apparatus of claim 1 wherein the spray is vertically directed.

20. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device, having a surface to be coated is not on the pair of rollers and wherein the spray nozzle is at an angle less than 90°

but greater than 5°

relative to either the first axis or second axis.

21. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers mounted on a tray, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device, having a surface to be coated is not on the pair of rollers.

22. The apparatus of claim 21 wherein the tray is movable.

23. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported;

b) a roller drive mechanism that is engagable with the first roller, second roller, or both first and second rollers, and c) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device having a surface to be coated is not on the pair of rollers.

24. The apparatus of claim 23 wherein the roller drive mechanism comprises an indexing function.

25. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis, and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device having a surface to be coated is not on the pair of rollers, and wherein the spray nozzle is movable in directions both parallel and perpendicular to a plane formed by the first and second roller axes.

26. The apparatus of claim 25 wherein the spray nozzle is movable in directions both parallel and perpendicular to the first or second axis via a movable arm.

27. An apparatus for coating a surface of a reliable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and comprising a sonicating member able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device, having a surface to be coated is not on the pair of rollers.

28. The apparatus of claim 27 wherein the sonicating member includes a channel for gas flow and the spray pattern is established in part by the gas flow.

29. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap in the range of 0.1 mm–

10 mm, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device having a surface to be coated is not on the pair of rollers.

30. The apparatus of claim 29 wherein the gap is in the range of 0.1 mm–

2.5 mm.

31. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis and a roller drive mechanism that causes rotation of the first roller, second roller, or both rollers, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle positioned above the gap and able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed Through the gap when a rollable device having a surface to be coated is not on the pair of rollers, and wherein the spray nozzle comprises a tip, the tip being a portion of the spray nozzle that is most proximal to the gap, and the distance from the tip to the gap is in the range of 1–

15 mm.

32. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first roller axis and a first loller circumference and a second roller having a second roller axis and a second roller circumference, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap tat has a width that is less than the first roller circumference or the second roller circumference, wherein the first roller circumference or second roller circumference is in the range of 5 mm–

100 mm, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device is not on the pair of rollers.

33. The apparatus of claim 32 wherein the first roller, second roller, or both first and second rollers, comprise a plurality of ribs.

34. The apparatus of claim 33 wherein the ribs have a shape that is wider proximal to die roller axis and narrower distal to the roller axis.

35. The apparatus of claim 32 wherein the spray nozzle is at an angle less than 90°

but greater than 5°

relative to either the first axis or second axis.

36. The apparatus of claim 32 wherein the first roller and second roller are simultaneously rotatable in the same direction.

37. The apparatus of claim 32 wherein the at least one pair of rollers is mounted on a tray.

38. The apparatus of claim 32 wherein the tray is movable.

39. The apparatus of claim 32 wherein the device rotator comprises a roller drive mechanism that is engagable with the first roller, second roller, or both first and second rollers.

40. The apparatus of claim 32 wherein the spray nozzle is movable in a direction parallel to the first or second axes.

41. The apparatus of claim 32 wherein the spray nozzle comprises a sonicating member.

42. The apparatus of claim 41 wherein the sonicating member includes a channel for gas flow and the spray pattern is established in part by the gas flow.

43. The apparatus of claim 32 wherein the gap is in the range of 0.1 mm–

10 mm.

44. The apparatus of claim 43 wherein the gap is in the range of 0.1 mm–

2.5 mm.

45. The apparatus of claim 32 wherein the first roller or second roller has a length in the range of 5 cm–

100 cm.

46. The apparatus of claim 32 wherein the spray nozzle comprises a tip, the tip being a portion of the spray nozzle that is most proximal to the gap, and the distance from the tip to the gap is in the range of 1–

15 mm.

47. The apparatus of claim 32 wherein the first roller has a first roller diameter and the second roller has a second roller diameter and wherein the gap has a width that is less than the first roller diameter or the second roller diameter.

48. The apparatus of claim 32 wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that a width of the pattern at the gap is not greater than 150% of the width of the gap.

49. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers mounted on a tray that is movable, each pair comprising a first roller having a first axis and a second roller having a second axis, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle able to produce a spray of a coating material in a controlled pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed through the gap when a rollable device is not on the pair of rollers.

50. The apparatus of claim 49 wherein the first roller, second roller, or both first and second rollers, comprise a plurality of ribs.

51. An apparatus for coating a surface of a rollable device comprising:

a) a device rotator comprising at least one pair of rollers, each pair comprising a first roller having a first axis and a second roller having a second axis, wherein the first and second axes are substantially parallel to each other, wherein the first and second rollers are separated by a gap, and wherein the device rotator is capable of supporting and rolling the rollable device in position as supported; and

b) a spray nozzle able to produce a spray of a coating material in a control pattern, wherein the spray nozzle is operationally arranged so that its spray is directed at the gap and so that the majority of the spray can be passed trough the gap when a rollable device is not on the pair of rollers, and wherein the spray nozzle is movable in directions both parallel and perpendicular to the first or second axes via a movable arm.