Device and method for coating of a metallic strip substrate on one side and/or on both sides

Abstract

A device for coating a metal strip substrate includes a guiding apparatus for guiding the strip substrate along a movement path. A first coating apparatus coats a first main side of the strip substrate with an electrostatically charged coating powder which is in a fluidized state. The first coating apparatus is arranged under a first path section of the movement path. A second coating apparatus coats a second main side of the strip substrate with an electrostatically charged coating powder which is in a fluidized state. A redirecting unit redirects the strip substrate between the first and the second coating apparatus in such a way that the strip substrate in a second path section travels oppositely to the strip substrate in the first path section. The second coating apparatus is arranged at least partly geodetically under the second path section.

Claims

1. A device for coating a metallic strip substrate, comprising: at least one guiding apparatus for guiding the strip substrate during the coating along a predetermined movement path; at least one first coating device for coating a first main side of the strip substrate with electrostatically charged coating powder stored in a fluidized state in a first container, the first container being arranged at least partially geodetically below a first path section of the movement path; at least one second coating device for coating a second main side of the strip substrate with electrostatically charged coating powder stored in a fluidized state in a second container, the second coating device being arranged downstream of the first coating device with respect to a running direction of the strip substrate along the movement path of the first coating device; at least one redirecting unit arranged between the first coating device and the second coating device with respect to the movement path for redirecting the strip substrate, wherein the first path section transitions into a second path section of the movement path by means of the redirecting unit, wherein the redirecting unit redirects the strip substrate in such a manner that the strip substrate in the second path section runs in the opposite direction to the strip substrate in the first path section, and wherein the second container is arranged at least partially geodetically below the second path section; a measuring device for contact-free measurement of a coating thickness produced by the first coating device or the second coating device, the measuring device being arranged downstream of the respective coating device; at least one stabilizing roller arranged upstream of the at least one first coating device or the at least one second coating device; and at least one control device connected to the measuring device, which controls an operation and/or positioning of at least one coating device and/or a positioning of the stabilizing roller as a function of a target coating thickness and measurement data generated by the measuring device.

2. The device according to claim 1, wherein the redirecting unit has two redirecting rollers.

3. The device according to claim 2, wherein at least one of the two redirecting rollers has an electrically grounded roller shell.

4. The device according to claim 1, wherein the at least one first coating device or the at least one second coating device is arranged so that it can be moved between a functional position and a rest position.

5. The device according to claim 1, further comprising at least one continuous strip furnace downstream of the second coating device for heat treating the coated strip substrate.

6. The device according to claim 5, further comprising at least one measuring sensor arranged downstream of the continuous strip furnace for detecting at least one product property of the coated strip substrate.

7. The device according to claim 1, wherein the at least one first coating device is arranged on a first movable positioning frame and/or wherein the at least one second coating device is movably arranged on a second movable positioning frame.

8. The device according to claim 7, wherein the control device adjusts the positioning of the at least one first coating device and/or the at least one second coating device.

9. The device according to claim 1, wherein the control device controls a positioning of the stabilizing roller.

10. The device according to claim 1, wherein a distance between the strip substrate and the at least one first coating device can be changed by changing a tensile stress in the strip substrate.

11. The device according to claim 1, wherein the control device controls a voltage applied to electrodes of the at least one first coating device.

12. The device according to claim 1, wherein the at least one stabilizing roller is arranged downstream of a material feed.

13. The device according to claim 1, wherein the at least one stabilizing roller reduces sag of the strip.

14. A device for coating a metallic strip substrate, comprising: a guiding apparatus for guiding the strip substrate during the coating along a predetermined movement path; a first coating device for coating a first main side of the strip substrate with electrostatically charged coating powder stored in a fluidized state in a first container, the first container being arranged at least partially geodetically below a first path section of the movement path; a second coating device for coating a second main side of the strip substrate with electrostatically charged coating powder stored in a fluidized state in a second container, the second coating device being arranged downstream of the first coating device with respect to a running direction of the strip substrate along the movement path of the first coating device; a redirecting unit arranged between the first coating device and the second coating device with respect to the movement path for redirecting the strip substrate, wherein the first path section transitions into a second path section of the movement path by means of the redirecting unit, wherein the redirecting unit redirects the strip substrate in such a manner that the strip substrate in the second path section runs in the opposite direction to the strip substrate in the first path section, and wherein the second container is arranged at least partially geodetically below the second path section; a measuring device for contact-free measurement of a coating thickness produced by the first coating device or the second coating device, the measuring device being arranged downstream of the respective coating device; a first stabilizing roller arranged upstream of the first coating device; a second stabilizing roller arranged upstream of the second coating device; and a control device connected to the measuring device, which controls at least one of an operation of the first coating device, an operation of the second coating device, a positioning of the first coating device, a positioning of the second coating device, a positioning of the first stabilizing roller, and a positioning of the second stabilizing roller as a function of a target coating thickness and measurement data generated by the measuring device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic representation of an exemplary embodiment for a device for coating a metallic strip substrate.

DETAILED DESCRIPTION

(2) FIG. 1 shows a schematic representation of an exemplary embodiment for a device 1 for coating a metallic strip substrate 2 on one side and/or on both sides.

(3) The device 1 comprises a guiding apparatus 3 for guiding the strip substrate 2 during coating along a predetermined movement path. The strip substrate 2 runs along the movement path according to the arrows arranged along the movement path. The guiding apparatus 3 comprises a redirecting roller 4, which redirects the vertically incoming strip substrate 2 into a horizontally running first path section of the movement path.

(4) Furthermore, the device 1 comprises a first coating device 5 for coating a first main side 6 of the strip substrate 2 with an electrostatically charged coating powder 8 fluidized in a first container 7. The first coating device 5 or the first container 7 is arranged at least partially geodetically below a first path section of the movement path.

(5) In addition, the device 1 comprises a second coating device 9 for coating a second main side 10 of the strip substrate 2 with an electrostatically charged coating powder 8 stored in a fluidized state in a second container 11. The second coating device 9 is downstream of the first coating device 5 with respect to the direction of travel of the strip substrate 2 along the movement path of the first coating device 5.

(6) The device 1 further comprises a redirecting unit 12 for redirecting the strip substrate 2, which is arranged between the first coating device 5 and the second coating device 9 with respect to the movement path. The first path section passes over the redirecting unit 12 into a second path section of the movement path. The first path section thus extends from the redirecting roller 4 to the redirecting unit 12. The redirecting unit 12 redirects the strip substrate 2 in such a manner that the strip substrate 2 in the second path section runs in the opposite direction to the strip substrate 2 in the first path section. The second coating device 9 or the second container 11 is arranged at least partially geodetically below the second path section. The redirecting unit 12 comprises two redirecting rollers 13 and 14, which are arranged in series and at a distance from each other in the height direction (Z-direction), each of which has an electrically grounded roller shell 15.

(7) Each coating device 5 or 9 is preceded by a stabilizing roller 16 or 17, which is arranged at least partially geodetically below the respective path section. If the strip substrate 2 is not coated by means of the first coating device 5, the stabilizing roller 17 may alternatively be positioned above the path section preceding the second coating device 9. Thereby, the stabilizing roller 17 can be moved by means of an adjusting device (not shown) to a position geodetically above or below the path section. This provides an additional process variable for the predetermined influencing of the powder coating thickness.

(8) Each coating device 5 or 9 is arranged to be movable between the functional position (shown) and a rest position (not shown). For this purpose, each coating device 5 or 9 is arranged on a positioning frame 18, which can be moved transversely to the strip running direction via a rail-guided traversing frame 19 with rail-guided rollers 20, or linear guides. Each positioning frame 18 allows the position of the respective coating device 5 or 9 to be varied in the x-, y- and/or z-direction, in order to be able to vary the position of the respective coating device 5 or 9 relative to the strip substrate 2.

(9) The device 1 also comprises a measuring device 21 for the contact-free measurement of the coating thickness produced by the first coating device 5. The measuring device 21 is arranged downstream of the first coating device 5 and is arranged between the redirecting rollers 13 and 14 of the redirecting unit 12. In addition, the device 1 comprises a measuring device 22 for the contact-free measurement of the coating thickness produced by the second coating device 9. The measuring device 22 is arranged downstream of the second coating device 5.

(10) The device 1 comprises a control device 23 connected to the measuring devices 21 and 22, which controls the operation of the first coating device 5, the second coating device 9 and the positioning frames 18 as a function of a target coating thickness and the measurement data generated by the measuring devices 21 and 22.

(11) The device 1 may have at least one application device (not shown) for applying a wet coating to the strip substrate 2. At least one of the redirecting rollers 13 and 14 can be a counter roller of the application device.

(12) Furthermore, the device 1 comprises two contact-free continuous strip furnaces 24 and 25, which are arranged downstream of the second coating device 9, for the heat treatment of the coated strip substrate 2. The measuring device 22 is arranged between the heat treatment furnace 24 and the second coating device 9.

(13) The device 1 can also have at least one measuring sensor 26 arranged downstream of the continuous strip furnace 25 for detecting at least one product property of the coated strip substrate 2. This measuring sensor 26 is also connected to the control device 23.

LIST OF REFERENCE SIGNS

(14) 1 Device

(15) 2 Strip substrate

(16) 3 Guiding apparatus

(17) 4 Redirecting roller

(18) 5 First coating device

(19) 6 First main side of 2

(20) 7 Container of 5

(21) 8 Coating powder

(22) 9 Second coating device

(23) 10 Second main side of 2

(24) 11 Container of 9

(25) 12 Redirecting unit

(26) 13 Redirecting roller of 12

(27) 14 Redirecting roller of 12

(28) 15 Roller shell

(29) 16 Stabilizing roller

(30) 17 Stabilizing roller

(31) 18 Positioning frame

(32) 19 Traversing frame

(33) 20 Roller of 19

(34) 21 Measuring device

(35) 22 Measuring device

(36) 23 Control device

(37) 24 Continuous strip furnace

(38) 25 Continuous strip furnace

(39) 26 Measuring sensor