Coating apparatus

Abstract

This invention relates to a coating device applied to control thickness of coating on print wheel, which comprises rotation axis, match unit and drive unit, wherein, the rotation axis is set with one coat unit; the match unit is to match rotation axis by rotation type located on both sides of coat unit; the match unit is to balance coat unit weight; the drive unit is coupled to rotation axis to drive rotation axis to adjust coat unit and print wheel distance.

Description

technical field [0001] The invention relates to a coating device, in particular to a coating device with the function of controlling the thickness of coating materials. Background technique [0002] The substrate of the liquid crystal display panel must undergo an alignment process in order to provide the required alignment and pre-tilt substrate for the liquid crystal molecules in the panel. In the alignment process, a layer of alignment film is first produced on the substrate, and then groove-like traces are brushed on the alignment film in order to make the liquid crystal molecules tilt in a certain direction and angle. Therefore, the film thickness and uniformity of the film thickness of the alignment film are very important. [0003] Please refer to FIGS. 1A-1B . FIG. 1A is a schematic diagram of an alignment film printing process of a conventional liquid crystal display panel, and FIG. 1B is a schematic diagram of the coating device in FIG. 1A . As shown in Figure 1A...

AI Technical Summary

Problems solved by technology

[0009] As shown in Table 2, the cylinder pressure required to lift the vane 16 is about 0.14-0.16 MPa, while the reduced cylinder pressure (about 0.025 MPa) in order to meet the requirements of the pulling force (about 1.3-1.4 N) is far less than 0.14 MPa, the rotating cylinder 17 will not be able to remove the blade 16 from the printing wheel 11 smoothly

[0010] Furthermore, since the material of the printing wheel 11 is usually ceramics, and the material of the blade 16 is usually plastic, when the pressing force of the blade 16 is too large, it is very easy to cause the wear of the blade 16 and transfer the abrasive of the blade 16 to the substrate. 15 up, so that defective products increase

In addition, when the blade 16 has insufficient downward pressure and the distance between the blade 16 and the printing wheel 11 is too large, vibrations are likely to occur between the blade 16, the printing wheel 11, or other parts on the machine, which will cause uneven coating of the alignment film material and cause Defects

Images