Micro concave coating liquid tank and micro concave coating system

Abstract

The utility model relates to a kind of micro concave coating liquid tank and micro concave coating system, micro concave coating liquid tank includes liquid tank main body, micro concave roller, micro concave roller is configured as rotating around its axis and from the first position of liquid tank main body into and by the second position of liquid tank main body out;Liquid tank main body has first liquid outlet area, second liquid outlet area and liquid inlet area, first liquid outlet area is arranged on the side wall of liquid tank main body adjacent to first position;Second liquid outlet area and liquid inlet area are arranged on the side wall of liquid tank main body adjacent to second position and it is flush with first liquid outlet area and located above liquid inlet area, respectively with the two side walls of liquid tank main body adjacent to first position, second position are located on the opposite sides of micro concave roller axis center line.The utility model improves the liquidity of coating liquid in liquid tank by optimizing liquid outlet area and liquid inlet area, so that agglomerated color paste can be discharged from the liquid outlet area on both sides of micro concave roller Accumulation of agglomerated color paste in liquid tank is avoided.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, specifically to a micro-recessed coating liquid tank and a micro-recessed coating system. Background Technology

[0002] Traditional coating methods (such as direct gravure coating or reverse gravure coating) typically require a back pressure roller to ensure close contact between the substrate and the coating roller. However, this method is prone to defects such as wrinkles and cracks on the coated surface. Microgravure coating is a reverse, contact coating method that eliminates the need for a back pressure roller, thus avoiding these defects. Its core component, the microgravure roller, has tiny cavities etched on its surface to store and transfer the coating material. During the coating process, the microgravure roller rotates in the opposite direction to the substrate's movement, using shear force to evenly transfer the coating material to the substrate surface.

[0003] Existing microgravure coating baths typically have liquid inlet at the front and outlet at the rear, aligning with the rotation direction of the microgravure roller. This results in weaker fluidity of the coating solution in certain areas within the bath, especially at the inlet side. During decorative film production, various color pastes are added to the coating solution. In continuous production, these color pastes tend to agglomerate on the surface of the coating solution. Due to the weak fluidity in certain areas of the bath, these agglomerated color pastes are easily attracted to the surface of the gravure roller and transferred to the material as the roller rotates, causing linear color variations on the material surface. This color variation severely affects the appearance quality and consistency of the decorative film, reduces the product yield, and increases production costs and quality control difficulty. Utility Model Content

[0004] The purpose of this invention is to provide a novel micro-gravure coating tank and micro-gravure coating system, which can improve the fluidity and uniformity of the coating liquid in the tank and reduce the agglomeration of pigment paste in the tank.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a micro-concave coating liquid tank, including a tank body and a micro-concave roller arranged above the tank body and partially extending into the tank body. The micro-concave roller is configured to rotate about its axis and enters the tank body from a first position and exits from a second position. The tank body has a first outlet area, a second outlet area, and an inlet area. The first outlet area is arranged on a side wall of the tank body adjacent to the first position. The second outlet area and the inlet area are both arranged on the side wall of the tank body adjacent to the second position. The second outlet area is flush with the first outlet area and located above the inlet area. The side wall of the tank body adjacent to the first position and the side wall of the tank body adjacent to the second position are located on opposite sides of the axis of the micro-concave roller.

[0007] Unless otherwise specified, the description in this application of "the micro-groove entering the liquid tank body from a first position and exiting from a second position of the liquid tank body" does not describe a change in the relative position of the micro-groove and the liquid tank body, but rather a change in the relative position of a local outer surface of the micro-groove and the liquid tank body. In fact, the micro-groove is only configured to rotate about its axis, and its relative position with the liquid tank body does not change.

[0008] In some embodiments, the upper end face of the liquid tank body is constructed as an open structure, the upper end face of the side wall of the liquid tank body adjacent to the first position is the first liquid outlet area, and the upper end face of the side wall of the liquid tank body adjacent to the second position is the second liquid outlet area.

[0009] In some embodiments, the liquid outlet surfaces of the first liquid outlet region and the second liquid outlet region are parallel to the horizontal plane.

[0010] In some embodiments, the micro-grooving coating liquid tank further includes a first flow guiding structure disposed within the main body of the tank. The first flow guiding structure includes a first plate and a second plate. The first plate is disposed within the main body of the tank at the second position and extends obliquely downwards toward the axis of the micro-grooving roller. The second plate is connected to the bottom end of the first plate and extends horizontally. There is a gap between the second plate and the bottom end face of the main body of the tank for the coating liquid to pass through. There is also a gap between the free end of the second plate and the main body of the tank for the coating liquid to pass through.

[0011] Furthermore, the first flow guiding structure also includes a third plate connected between the upper end of the first plate and the upper end of the side wall of the liquid tank body adjacent to the second position, the upper end of the third plate being configured as at least part of the second liquid outlet position.

[0012] In some embodiments, a second flow guiding structure is provided on the first liquid outlet area and the second liquid outlet area.

[0013] Furthermore, the second flow guiding structure is a guide slope constructed outside the liquid outlet area, or a flow guiding plate arranged on the liquid outlet area.

[0014] In some embodiments, the microgravure coating liquid tank further includes two overflow channels disposed on both sides of the liquid tank body. The two overflow channels are configured to be connected to the liquid supply unit of the microgravure coating system through a channel. One of the two overflow channels is connected to the first liquid outlet area and shares a side wall of the liquid tank body adjacent to the first position with the liquid tank body. The other overflow channel is connected to the second liquid outlet area and shares a side wall of the liquid tank body adjacent to the second position with the liquid tank body.

[0015] This invention also provides a micro-grooving coating system, which includes a micro-grooving coating liquid tank as described above.

[0016] In some embodiments, the microgravure coating system further includes a doctor blade, a conveying unit, and a liquid supply unit. The doctor blade is disposed above the liquid tank body and contacts the microgravure roller. The conveying unit is configured to guide the substrate to the microgravure roller and contact the surface of the microgravure roller. The liquid supply unit has a liquid storage container, a liquid supply pump, a filter, an inlet pipe, and an outlet pipe. The inlet pipe connects the liquid storage container and the inlet area. The filter and the liquid supply pump are disposed on the inlet pipe. The outlet pipe connects the first outlet area, the second outlet area, and the liquid storage container.

[0017] In some embodiments, the liquid supply unit further includes a stirring paddle disposed on the liquid storage container.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] This invention improves the fluidity of the coating liquid in the tank by optimizing the liquid outlet and liquid inlet areas, allowing agglomerated pigments to be discharged from the liquid outlet areas on both sides of the micro-concave roller, thus avoiding the accumulation of agglomerated pigments in the tank and improving coating quality. Attached Figure Description

[0020] Figure 1 A simplified structural diagram of the micro-recessed coating liquid tank provided in Example 1;

[0021] Figure 2 Another simplified structural diagram of the micro-recessed coating liquid tank provided in Example 1;

[0022] Figure 3A simplified structural diagram of the microgravure coating system provided in Example 1;

[0023] Among them, 1. Liquid tank body; 11. First liquid outlet area; 12. Second liquid outlet area; 13. Liquid inlet area; 14. Guide slope; 15. Flow guide plate; 16. First overflow channel; 17. Second overflow channel; 18. Liquid surface;

[0024] 2. First flow guide structure; 21. First plate; 22. Second plate; 23. Third plate;

[0025] 3. Micro-concave roller;

[0026] 4. Scraper;

[0027] 5. Liquid supply unit; 51. Main liquid outlet pipe; 52. Branch liquid outlet pipe; 53. Liquid inlet pipe; 54. Liquid storage container; 55. Liquid supply pump; 56. Filter; 57. Feeding trolley; 58. Agitator;

[0028] 6. Conveyor rollers;

[0029] 7. Substrate. Detailed Implementation

[0030] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0031] In the description of the embodiments of this utility model, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship as described above. Figure 1 The orientations shown are defined only for the purpose of facilitating the description of the embodiments of this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0035] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0036] Example 1

[0037] A micro-recessed coating tank, such as Figure 1 and Figure 2 As shown, it includes a liquid tank body 1 and a micro-concave roller 3. The micro-concave roller 3 is arranged above the liquid tank body 1 and extends partially into the liquid tank body 1, thereby contacting the coating liquid inside the liquid tank body 1. The micro-concave roller 3 is configured to rotate about its axis and enters the liquid tank body 1 from a first position and exits from a second position. The structure of the micro-concave roller 3 can refer to the prior art. The liquid tank body 1 has a first liquid outlet area 11, a second liquid outlet area 12, and a liquid inlet area 13. The first liquid outlet area 11 is arranged on the side wall of the liquid tank body 1 adjacent to the first position, and the second liquid outlet area 12 and the liquid inlet area 13 are both arranged on the side wall of the liquid tank body 1 adjacent to the second position. The second liquid outlet area 12 is flush with the first liquid outlet area 11 and located above the liquid inlet area 13. The side wall of the liquid tank body 1 adjacent to the first position and the side wall of the liquid tank body 1 adjacent to the second position are located on opposite sides of the axis of the micro-concave roller 3. by Figure 2 For example, the micro-concave roller 3 has liquid inlet on the left and liquid outlet on the right. The liquid inlet area 13 of the liquid tank body 1 is located on the right side, that is, the liquid outlet side of the micro-concave roller 3. Furthermore, the liquid outlet area of ​​the liquid tank body 1 is arranged on both the liquid inlet side and the liquid outlet side of the micro-concave roller 3.

[0038] In existing micro-gravure coating tanks, the inlet area 13 is typically located on the inlet side of the micro-gravure roller 3, i.e., on the side wall of the tank body 1 adjacent to the first position, while the outlet area is typically located on the outlet side of the micro-gravure roller 3, i.e., on the side wall of the tank body 1 adjacent to the second position. When the coating liquid enters through the inlet area 13, the flow rate of the coating liquid on the side of the first position is slower than that on the side of the second position due to the rotation of the micro-gravure roller 3 and its own inlet speed. Agglomerated pigments tend to accumulate, especially on the side of the first position, resulting in poor coating. This application optimizes the inlet area 13 and the outlet area, improving the flowability of the coating liquid within the tank. This allows agglomerated pigments to be discharged from the tank through the outlet areas on both sides of the micro-gravure roller 3, preventing the accumulation of agglomerated pigments within the tank and thus improving coating quality.

[0039] Specifically, the upper surface of the liquid tank body 1 is constructed as an open structure. The upper surface of the side wall of the liquid tank body 1 adjacent to the first position is the first liquid outlet area 11, and the upper surface of the side wall of the liquid tank body 1 adjacent to the second position is the second liquid outlet area 12. Preferably, the liquid outlet surfaces 18 of the first liquid outlet area 11 and the second liquid outlet area 12 are parallel to the horizontal plane. That is, the upper surface of the side wall of the liquid tank body 1 adjacent to the first position and the upper surface of the side wall of the liquid tank body 1 adjacent to the second position are planes parallel to the horizontal plane. The coating liquid in the liquid tank body 1 is configured to be flush with the first liquid outlet area 11 and the second liquid outlet area 12 so that the coating liquid is discharged from both sides, preventing the accumulation of agglomerated pigment paste and causing abnormal color differences such as lines on the material surface.

[0040] To collect the coating liquid discharged from both sides, the microgravure coating liquid tank also includes two overflow channels disposed on both sides of the tank body 1. The two overflow channels are configured to connect to the liquid supply unit 5 of the microgravure coating system via channels. One overflow channel (i.e., the first overflow channel 16) is connected to the first outlet area 11 and shares a side wall of the tank body 1 adjacent to the first position with the tank body 1. The other overflow channel (i.e., the second overflow channel 17) is connected to the second outlet area 12 and shares a side wall of the tank body 1 adjacent to the second position with the tank body 1. Second flow guiding structures are provided on the first outlet area 11 and the second outlet area 12. In this embodiment, the second flow guiding structure of the first outlet area 11 is a guide slope 14 constructed outside the outlet area, and the second flow guiding structure of the second outlet area 12 is a guide plate 15 arranged on the outlet area, used to guide the coating liquid into the overflow channel.

[0041] The micro-coating liquid tank also includes a first flow guiding structure 2 arranged within the liquid tank body 1. The first flow guiding structure 2 includes a first plate 21, a second plate 22, and a third plate 23. The first plate 21 is disposed within the liquid tank body 1 at the second position and extends obliquely downwards towards the axis of the micro-coating roller 3. The second plate 22 is connected to the bottom end of the first plate 21 and extends horizontally, with a gap between the second plate 22 and the bottom surface of the liquid tank body 1, and a gap between the free end of the second plate 22 and the liquid tank body 1. The third plate 23 is connected between the upper end of the first plate 21 and the upper end of the side wall of the liquid tank body 1 adjacent to the second position, and the upper end of the third plate 23 is configured as at least part of the second liquid outlet position. The first plate 21, the second plate 22, and the third plate 23 are integrally formed. The first flow guiding structure 2 extends axially along the micro-coating roller 3, and its two ends are preferably connected to both sides of the liquid tank body 1. The first flow guiding structure 2 further ensures the smooth and uniform flow of the coating liquid.

[0042] Example 2

[0043] A microgravure coating system includes a doctor blade 4, a conveying unit, a liquid supply unit 5, and a microgravure coating liquid tank. The microgravure coating liquid tank is as described above and will not be repeated here.

[0044] The scraper 4 is positioned above the liquid tank body 1 and contacts the micro-concave roller 3. Preferably, the contact between the scraper 4 and the micro-concave roller 3 is flexible. The construction and connection method of the scraper 4 can refer to the prior art.

[0045] The conveying unit is configured to guide the substrate 7 to the micro-concave roller 3 and bring it into contact with the surface of the micro-concave roller 3. In some embodiments, the conveying unit includes a plurality of conveying rollers 6 rotatable about their own axis, and the structure and arrangement of the conveying rollers 6 may also refer to the prior art.

[0046] The liquid supply unit 5 includes a liquid storage container 54, a liquid supply pump 55, a filter 56, an inlet pipe 53, and an outlet pipe. The inlet pipe 53 connects the liquid storage container 54 and the inlet area 13, and the filter 56 and the liquid supply pump 55 are mounted on the inlet pipe 53. The outlet pipe connects the first outlet area 11, the second outlet area 12, and the liquid storage container 54. The outlet pipe includes a main outlet pipe 51 connected to the outlet container and two branch outlet pipes 52 connected to the main outlet pipe 51. One branch outlet pipe 52 is connected to the bottom of the first overflow tank 16, and the other branch outlet pipe 52 is connected to the bottom of the second overflow tank 17. Preferably, the liquid supply unit 5 also includes a stirring paddle 58 mounted on the liquid storage container 54 to stir the coating liquid in the liquid storage container 54, so that the agglomerated pigment returning to the liquid storage container 54 is mixed evenly with the coating liquid. The bottom of the liquid storage container 54 is equipped with casters, and the filter 56 and the liquid supply pump 55 are mounted on the feeding trolley 57 for easy movement.

[0047] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A micro-grooving coating tank, comprising a tank body (1) and a micro-grooving roller (3) arranged above the tank body (1) and partially extending into the tank body (1), characterized in that: The micro-concave roller (3) is configured to rotate about its axis and enter the liquid tank body (1) from a first position and exit from a second position of the liquid tank body (1); The liquid tank body (1) has a first liquid outlet area (11), a second liquid outlet area (12), and a liquid inlet area (13). The first liquid outlet area (11) is arranged on the side wall of the liquid tank body (1) adjacent to the first position. The second liquid outlet area (12) and the liquid inlet area (13) are both arranged on the side wall of the liquid tank body (1) adjacent to the second position, and the second liquid outlet area (12) is flush with the first liquid outlet area (11) and located above the liquid inlet area (13). The sidewalls of the liquid tank body (1) adjacent to the first position and the sidewalls of the liquid tank body (1) adjacent to the second position are located on opposite sides of the axis of the micro-concave roller (3).

2. The micro-recessed coating liquid tank according to claim 1, characterized in that: The upper end face of the liquid tank body (1) is an open structure. The upper end face of the side wall of the liquid tank body (1) adjacent to the first position is the first liquid outlet area (11), and the upper end face of the side wall of the liquid tank body (1) adjacent to the second position is the second liquid outlet area (12).

3. The micro-recessed coating liquid tank according to claim 1, characterized in that: The liquid outlet surfaces of the first liquid outlet area (11) and the second liquid outlet area (12) are parallel to the horizontal plane.

4. The micro-recessed coating liquid tank according to claim 1, characterized in that: The micro-concave coating liquid tank also includes a first flow guiding structure (2) arranged in the main body (1) of the liquid tank. The first flow guiding structure (2) includes a first plate (21) and a second plate (22). The first plate (21) is arranged in the main body (1) of the liquid tank at the second position and extends obliquely from top to bottom toward the axis of the micro-concave roller (3). The second plate (22) is connected to the bottom end of the first plate (21) and extends in the horizontal direction. There is a gap between the second plate (22) and the bottom end face of the liquid tank body (1) that allows the coating liquid to pass through. There is also a gap between the free end of the second plate (22) and the liquid tank body (1) that allows the coating liquid to pass through.

5. The micro-recessed coating liquid tank according to claim 4, characterized in that: The first flow guiding structure (2) further includes a third plate (23) connected between the upper end of the first plate (21) and the upper end of the side wall of the liquid tank body (1) adjacent to the second position, the upper end of the third plate (23) being configured as at least part of the second liquid outlet position.

6. The micro-recessed coating liquid tank according to claim 1, characterized in that: A second flow guiding structure is provided on the first liquid outlet area (11) and the second liquid outlet area (12).

7. The micro-recessed coating liquid tank according to claim 6, characterized in that: The second flow guiding structure is a guide slope (14) constructed on the outside of the liquid outlet area, or a flow guiding plate (15) arranged on the liquid outlet area.

8. The micro-recessed coating liquid tank according to claim 1, characterized in that: The microgravure coating liquid tank also includes two overflow channels located on both sides of the main body of the liquid tank (1). The two overflow channels are configured to be connected to the liquid supply unit (5) of the microgravure coating system via channels. One of the two overflow channels is connected to the first liquid outlet area (11), and it shares the side wall of the liquid tank body (1) adjacent to the first position with the liquid tank body (1). Another overflow trough is connected to the second liquid outlet area (12), and it shares the side wall of the liquid tank body (1) adjacent to the second position with the liquid tank body (1) of the liquid tank body (1).

9. A microgravure coating system, characterized in that: Includes the micro-recessed coating liquid tank as described in any one of claims 1 to 8.

10. The microgravure coating system according to claim 9, characterized in that: The micro-grooving coating system also includes a doctor blade (4), a conveying unit and a liquid supply unit (5), wherein the doctor blade (4) is disposed above the liquid tank body (1) and in contact with the micro-grooving roller (3); The conveying unit is configured to guide the substrate (7) to the micro-concave roller (3) and to contact the surface of the micro-concave roller (3); The liquid supply unit (5) has a liquid storage container (54), a liquid supply pump (55), a filter (56), a liquid inlet pipe (53), and a liquid outlet pipe. The liquid inlet pipe (53) is used to connect the liquid storage container (54) and the liquid inlet area (13). The filter (56) and the liquid supply pump (55) are located on the liquid inlet pipe (53). The liquid outlet pipe is used to connect the first liquid outlet area (11), the second liquid outlet area (12), and the liquid storage container (54).

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