Coating tool bit for coating film on slit

Abstract

The invention provides a coating cutter head for coating a film on a slit, which is characterized by comprising a first cutter body (1), a cushion block (2) and a second cutter body (3) which are sequentially connected together, sealing plates (4) are connected to the end faces of the two ends of the first cutter body (1), the cushion block (2) and the second cutter body (3), and liquid guide rods (5) which are correspondingly matched with each other are connected to the lower ends of the sealing plates (4). A liquid guide cavity (6) is formed in the inner side of the first cutter body (1), the inner side of the cushion block (2), the inner side of the second cutter body (3), the inner side of the sealing plate (4) and the inner side of the liquid guide rod (5), a liquid inlet cavity (1a) is formed in the first cutter body (1), a liquid inlet pipe (1b) is arranged on the first cutter body (1), and a liquid inlet hole (1c) communicated with the liquid guide cavity (6) is formed in the inner wall of the first cutter body (1). The film coating device is simple in structure and convenient to use, the film thickness is accurately controlled, the film coating liquid is coated on the substrate through the liquid guide rod, the bubble defect cannot be introduced, and the film coating thickness is uniform.

Description

Technical Field

[0001] The invention relates to the field of glass coating and film coating, in particular to a coating knife head for slit coating and film coating. Background Art

[0002] There is a type of slit coating equipment on the market that sprays the coating liquid onto the substrate through a slit-shaped nozzle to form a film layer. Compared with other liquid phase coating technologies, slit coating equipment and technology have a higher coating rate and higher coating liquid utilization rate, so it is used in many industrial productions that require large-area liquid phase coating.

[0003] In existing slit coating equipment, when the coating liquid is sprayed on the substrate through the nozzle of the coating cutter head, due to the certain distance between the nozzle and the substrate, a meniscus will be formed when the coating liquid contacts the substrate. When the coating rate is fast, bubbles may be introduced, and even a discontinuous coating may be formed, resulting in uneven coating. For example, the patent document [CN107321554A] stabilizes the meniscus by setting a negative pressure chamber in the middle of the extrusion coating head and the coating roller, wherein the negative pressure chamber needs to be connected to the negative pressure buffer tank through a negative pressure pipe, and the negative pressure buffer tank needs to be connected to the negative pressure tank. In addition, a fan device needs to be connected, and the overall equipment is relatively complex, which brings instability to the coating operation.

[0004] Secondly, the current slit coating equipment mainly controls the amount of coating liquid sprayed out by the nozzle gap, that is, the slit width of the coating blade. The adjustment range is narrow and difficult to control accurately. The current mainstream method is to adjust the slit width through a gasket. For example, the patent document [CN111819008A] adjusts the slit width by adding a gasket to the slit template, and its design and operation are relatively complicated. The patent document [CN116727185A] adjusts the slit width by adjusting the gasket sandwiched between the two molds through a nut. During use, this method may cause different displacements of the gasket at different positions due to the contact deviation between the nut and the gasket, resulting in deviations in the slit width at different positions, causing uneven coating. Summary of the invention

[0005] The present invention aims to overcome the deficiencies in the prior art and provides a coating blade head for slit coating and film plating.

[0006] This application provides the following technical solutions: A coating tool head for slit coating and plating, characterized in that it includes a first tool body, a cushion block and a second tool body are detachably connected in sequence on one side of the upper part of the first tool body, a sealing plate is detachably connected to the end faces of both ends of the first tool body, the cushion block and the second tool body, a liquid guiding rod corresponding to the first tool body and the second tool body is detachably connected to the lower end of the sealing plate, a liquid guiding cavity is formed inside the first tool body, the cushion block, the second tool body, the sealing plate and the liquid guiding rod, a liquid inlet cavity is provided in the first tool body, a liquid inlet pipe is provided on the first tool body, and a liquid inlet hole connected to the liquid guiding cavity is provided on the inner wall of the first tool body.

[0007] On the basis of the above technical solutions, there are also the following further technical solutions: The liquid-conducting rod comprises a rod body, on which annular liquid-conducting teeth protruding outward are evenly distributed, and adjacent annular liquid-conducting teeth and the rod body form liquid-conducting tooth grooves.

[0008] A second liquid inlet cavity is provided in the second blade body, a second liquid inlet pipe communicating with the second liquid inlet cavity is provided on the second blade body, and a second liquid inlet hole communicating with the liquid guiding cavity is provided on the inner wall of the second blade body.

[0009] An arc groove corresponding to the liquid guiding rod is provided at the lower end of the first blade body and the second blade body.

[0010] Advantages of the invention: The invention can accurately control the spraying amount of the coating liquid by the depth and width of the tooth marks of the toothed liquid-conducting rod and the distance between the tooth marks, thereby accurately controlling the film thickness. The coating liquid is coated on the substrate through the liquid-conducting rod without introducing bubble defects, so that the coating thickness is uniform. In addition, the toothed liquid-conducting rod can be customized as needed, can adjust the width of the coating area, and can be disassembled and cleaned, so it is easy to clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a top view of embodiment 1 of the present invention; Figure 2 yes Figure 1 BB cross-sectional view; Figure 3 is a front view of Embodiment 1 of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of embodiment 1 of the present invention; Figure 5 It is a structural diagram of embodiment 2 of the present invention. DETAILED DESCRIPTION Example

[0012] like Figure 1-4As shown, a coating blade head for slit coating includes a first blade body 1, a cushion block 2 and a second blade body 3 are detachably connected in sequence through a set of locking bolts 7 on one side of the upper part of the first blade body 1. A threaded connection column 8 connected to the coating equipment is fixedly connected to the top of the first blade body 1. The threaded connection column 8 is connected to the coating machine.

[0013] Sealing plates 4 are detachably connected to the front and rear end surfaces of the first blade body 1, the cushion block 2 and the second blade body 3 by screws. An arc groove 9 is provided on the inner side of the lower end of the first blade body 1 and the second blade body 3. A U-shaped connecting seat 4a is provided on the inner side of the lower end of each sealing plate 4.

[0014] A liquid-conducting rod 5 is connected between the two connecting seats 4a, and the liquid-conducting rod 5 includes a rod body 5a, on which annular liquid-conducting teeth 5b protruding outward are evenly distributed, and adjacent annular liquid-conducting teeth 5b and the rod body 5a form liquid-conducting tooth grooves 5c. Sealing sleeves 5e corresponding to the arc grooves 9 are sleeved on the annular liquid-conducting teeth 5b at both ends of the rod body 5a. A liquid conducting cavity 6 is formed inside the first blade body 1 , the cushion block 2 , the second blade body 3 , the sealing plate 4 and the liquid conducting rod 5 .

[0015] A liquid inlet cavity 1a is provided in the first blade body 1, a liquid inlet pipe 1b is provided on the first blade body 1, and a liquid inlet hole 1c connected to the liquid guide cavity 6 is provided on the inner wall of the first blade body 1. The liquid output of the liquid inlet hole 1c is less than the maximum liquid input of the liquid inlet pipe 1b. When liquid is input into the liquid inlet pipe 1b, the valve on it is first fully opened for a period of time, so that a certain amount of liquid accumulates in the liquid inlet cavity 1a, and then the valve is closed to adjust the liquid input amount of the liquid inlet pipe 1b so that the liquid input amount is the same as the liquid output amount of the liquid inlet hole 1c. This design is to ensure that even if liquid cannot be input temporarily when the liquid inlet pipe 1b is replaced, the accumulated liquid in the liquid inlet cavity 1a can still meet the production needs, and there will be no problem of stopping the machine for production, thus ensuring the continuity of production.

[0016] A liquid level gauge (not shown) is also provided on the outer wall of the first blade body 1 so that the staff can grasp the amount of liquid accumulated in the liquid inlet cavity 1a. Example

[0017] like Figure 5 As shown, the difference between Embodiment 2 and Embodiment 1 is that a second liquid inlet cavity 3a is provided in the second blade body 3, a second liquid inlet pipe 3b communicating with the second liquid inlet cavity 3a is provided on the second blade body 3, and a second liquid inlet hole 3c communicating with the liquid guide cavity 6 is provided on the inner wall of the second blade body 3. Other identical structures are not described here.

Claims

1. A coating blade for slit coating, characterized in that: The invention comprises a first blade body (1), a cushion block (2) and a second blade body (3) are detachably connected in sequence on one side of the upper part of the first blade body (1), a sealing plate (4) is detachably connected to the end surfaces of both ends of the first blade body (1), the cushion block (2) and the second blade body (3), a liquid guide rod (5) corresponding to the first blade body (1) and the second blade body (3) is detachably connected to the lower end of the sealing plate (4), a liquid guide cavity (6) is formed inside the first blade body (1), the cushion block (2), the second blade body (3), the sealing plate (4) and the liquid guide rod (5), a liquid inlet cavity (1a) is provided inside the first blade body (1), a liquid inlet pipe (1b) is provided on the first blade body (1), and a liquid inlet hole (1c) communicating with the liquid guide cavity (6) is provided on the inner wall of the first blade body (1).

2. A coating blade for slit coating according to claim 1, characterized in that: The liquid-conducting rod (5) comprises a rod body (5a), on which outwardly protruding annular liquid-conducting teeth (5b) are evenly distributed, and adjacent annular liquid-conducting teeth (5b) and the rod body (5a) form liquid-conducting tooth grooves (5c).

3. A coating blade for slit coating according to claim 1, characterized in that: A second liquid inlet cavity (3a) is provided in the second blade body (3), a second liquid inlet pipe (3b) communicating with the second liquid inlet cavity (3a) is provided on the second blade body (3), and a second liquid inlet hole (3c) communicating with the liquid guide cavity (6) is provided on the inner wall of the second blade body (3).

4. A coating blade for slit coating according to claim 1, characterized in that: An arc-shaped groove (10) corresponding to the liquid-conducting rod (5) is provided at the lower end portions of the first blade body (1) and the second blade body (3).

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