Coating thickness measuring device and coating device including the same
A coating thickness measuring device is configured to measure a thickness of a coating material applied to a substrate which is fed by a coating roll on which the substrate is rolled. The coating thickness measuring device includes a coating thickness measurement module, wherein the coating thickness measurement module includes a light applying unit configured to apply light to a surface of the coating material applied to a portion of the substrate rolled on the coating roll, a light acquisition unit configured to acquire light reflected from the surface of the coating material, and a processor configured to calculate the thickness of the coating material based on the acquired light. Accordingly, when measuring the thickness of the coating material the thickness measurement accuracy may be improved. A coating device including the same is also provided.
1 . A coating device comprising a coating thickness measuring device configured to measure a thickness of a coating material applied to a substrate which is fed by a coating roll on which the substrate is rolled, and a coating material coating device which applies the coating material to the substrate,
wherein the coating thickness measuring device comprises:
a coating thickness measurement module and,
a position movement module configured to move the coating thickness measurement module with respect to the coating roll,
wherein the coating thickness measurement module includes:
a light applying unit configured to apply light to a surface of the coating material applied to a portion of the substrate rolled on the coating roll;
a light acquisition unit configured to acquire light reflected from the surface of the coating material; and
a processor configured to calculate the thickness of the coating material based on the acquired light,
wherein the coating material coating device is a slot die that dispenses the coating material through an outlet formed in the shape of a slit,
wherein the position movement module is coupled to an outer side of the slot die so as to be integrated with the slot die,
wherein the coating thickness measurement module is disposed in the position movement module and configured to move to the portion of the substrate rolled on the coating roll.
2 . The coating device according to claim 1 , wherein the coating thickness measurement module is configured to move in 3-axis directions with respect to the coating roll to apply the light to the portion of the substrate rolled on the coating roll.
3 . The coating device according to claim 1 , wherein the coating thickness measurement module is configured to measure the thickness of the coating material applied to a portion of the substrate contacting an outer surface of the coating roll.
4 . The coating device according to claim 3 , wherein the coating thickness measurement module is configured to measure the thickness of the coating material applied to an end portion at which the contact between the substrate and the coating roll is maintained in the portion of the substrate rolled on the coating roll.
5 . The coating device according to claim 4 , wherein the coating thickness measurement module is configured to measure the thickness of the coating material while it is located on a center line of the coating roll passing through the end portion at which the contact between the substrate and the coating roll is maintained.
6 . The coating device according to claim 1 , wherein a plurality of the coating thickness measurement modules isare arranged in a lengthwise direction of the coating roll, and
wherein a distance between the plurality of coating thickness measurement modules is adjustable.
7 . The coating device according to claim 1 , wherein the position movement module includes:
a first position movement unit configured to move the coating thickness measurement module in a lengthwise direction of the coating roll; and
a guide unit configured to guide the movement of the first position movement unit in the lengthwise direction of the coating roll.
8 . The coating device according to claim 7 , wherein the guide unit is coupled to a coating material coating device which is configured to apply the coating material to the substrate.
9 . The coating device according to claim 7 , wherein the position movement module further includes:
a second position movement unit coupled to one side of the first position movement unit and configured to move the coating thickness measurement module in at least one direction of a horizontal direction or a vertical direction of the coating roll perpendicular to the lengthwise direction of the coating roll, and
wherein the coating thickness measurement module measures the thickness of the coating material applied to the substrate at a location to which the coating thickness measurement module is moved by the second position movement unit.
10 . The coating device according to claim 9 , wherein the position movement module further includes:
a rotation actuation unit to rotate the coating thickness measurement module in a clockwise or a counterclockwise direction.
11 . The coating device according to claim 1 , further comprising:
a temperature measurement module configured to measure a temperature change of the coating roll at a location of the coating roll on which the substrate is rolled.
12 . The coating device according to claim 1 , further comprising:
a coating roll rotation detection module coupled to an end of the coating material coating device adjacent to the coating roll and configured to detect one revolution of the coating roll; and
a vibration measurement module configured to measure roundness of the coating roll.
13 . The coating device according to claim 1 , wherein the processor is configured to correct the thickness of the coating material applied to the substrate using measurement data acquired from the coating thickness measuring device.