Extrusion coating head and coating equipment

Abstract

According to the extrusion coating head and the coating equipment, the extrusion coating head comprises an upper die head and a lower die head; the first runner is communicated with a first material cavity formed in the lower die head, and the first material supply pipe is communicated with the first material cavity; the die comprises an upper die head, a lower die head and a gasket, the gasket is arranged between the upper die head and the lower die head, the die further comprises second to n material cavities arranged on the lower die head and second to n material supply pipes arranged corresponding to and communicated with the second to n material cavities, second to n control valves are correspondingly arranged on the second to n material supply pipes, and n is larger than or equal to 0; the gasket is provided with a plurality of separators extending towards the direction of the first runner, the separators correspondingly divide the second to the nth material cavities into a plurality of sub-runners capable of being independently controlled, and all the second to the nth control valves are configured to be that when the control valves are opened, the corresponding sub-runners are opened for coating, and when the control valves are closed, the corresponding sub-runners are opened for coating. And the coating of the corresponding sub-runners is stopped. The utility model has the advantages of simple structure and low manufacturing difficulty.

Description

Technical Field

[0001] The utility model relates to the technical field of coating equipment, in particular to an extrusion coating head and coating equipment. Background Art

[0002] Extrusion coating generally involves extruding a material (such as a slurry) through a slit outlet of an extrusion coating die head and attaching it to the surface of a substrate (such as a film material) to form a composite layered structure. Current extrusion coating dies can only coat the entire surface of a substrate, but cannot form a coating with blank spaces at predetermined locations or gaps.

[0003] In order to solve the above problems, Chinese patent document CN 115970987A discloses an extrusion coating die and a coating machine, including a die body, the die body having a feed port, an extrusion coating port, and an extrusion flow channel connecting the feed port and the extrusion coating port; a plurality of coating control parts arranged side by side, the direction in which the coating control parts are arranged side by side intersects with the material extrusion direction of the extrusion flow channel; the coating control part includes a first coating control part, the first coating control part has a first working position and a second working position, and can be switched between the first working position and the second working position; the first working position is configured to correspond to the first coating control part to open the extrusion flow channel within its range, and the second working position is configured to correspond to the first coating control part to block the extrusion flow channel within its range. According to the above scheme, although blank coating with controllable position, size and spacing can be achieved during coating, this extrusion coating die has the problems of complex structure and high manufacturing difficulty. Utility Model Content

[0004] The utility model provides an extrusion coating head, coating equipment and coating method, aiming to solve the problems of complex structure and great manufacturing difficulty of the extrusion coating die head in the prior art.

[0005] The utility model provides an extrusion coating head, comprising an upper die head and a lower die head; a first flow channel, formed between the upper die head and the lower die head, the first flow channel is communicated with a first material chamber arranged on the lower die head, and a first feed pipe is communicated with the first material chamber; and a gasket, arranged between the upper die head and the lower die head, and also comprising second to nth material chambers arranged on the lower die head, and second to nth feed pipes correspondingly arranged and communicated with the second to nth material chambers, and second to nth control valves are correspondingly arranged on the second to nth feed pipes, wherein n is greater than or equal to 0; the gasket is provided with a plurality of partitions extending in the direction of the first flow channel, the partitions correspondingly separate the second to nth material chambers into a plurality of independently controllable branch flow channels, and all the second to nth control valves are configured such that when the control valve is opened, the corresponding branch flow channels are opened for coating, and when the control valve is closed, the corresponding branch flow channels stop coating.

[0006] As an improvement to the present invention, a first control valve is provided on the first feed pipe.

[0007] As an improvement to the present invention, the second to nth control valves are gap coating control valves.

[0008] As an improvement to the present invention, the first control valve is a gap coating control valve.

[0009] As an improvement to the present invention, the gasket is provided with an isolation sheet for covering the second to nth material cavities.

[0010] As an improvement to the present invention, the gasket comprises at least two layers of gaskets, which are stacked one above the other, wherein the top layer of gaskets is used to form a separator, and the remaining gaskets are used to form an isolation sheet covering the second to nth material cavities.

[0011] As an improvement to the utility model, a control system is further included, and the control system is used to control the control valve to be opened or closed according to a predetermined program.

[0012] The utility model also provides a coating device, comprising a substrate feeding mechanism and a coating back roller, wherein an extrusion coating head coats the substrate on the back roller, and the extrusion coating head is the above-mentioned extrusion coating head.

[0013] The utility model adopts a structure including second to nth material chambers arranged on the lower die head, and second to nth material supply pipes corresponding to and communicated with the second to nth material chambers, and second to nth control valves are correspondingly arranged on the second to nth supply pipes, wherein n is greater than or equal to 0; the gasket is provided with a plurality of partitions extending in the direction of the first flow channel, and the partitions separate the second to nth material chambers into a plurality of independently controllable branch flow channels, and all the second to nth control valves are configured such that when the control valve is opened, the corresponding branch flow channels are opened for coating, and when the control valve is closed, the corresponding branch flow channels stop coating; therefore, the utility model has the advantages of simple structure and low manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure diagram of the first embodiment of the utility model.

[0015] Figure 2 for Figure 1 A schematic diagram of the planar structure of the gasket in the embodiment shown in FIG.

[0016] Figure 3 for Figure 1 Enlarged structural diagram at A in the middle.

[0017] Figure 4This is a schematic diagram of the planar structure of the lower die head of the second embodiment of the utility model.

[0018] Figure 5 It is a schematic diagram of the three-dimensional exploded structure of the second embodiment of the utility model.

[0019] Figure 6 for Figure 5 Schematic diagram of the plane structure of the gasket.

[0020] Figure 7 for Figure 5 Schematic diagram of coating effect of the embodiment shown.

[0021] Figure 8 A schematic diagram of another achievable coating effect.

[0022] Fig. 9 A schematic diagram of another achievable coating effect. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] like Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 Disclosed is a first embodiment of an extrusion coating head of the utility model, comprising an upper die head 1 and a lower die head 2; a first flow channel 3 formed between the upper die head 1 and the lower die head 2, the first flow channel 3 communicating with a first material cavity 21 arranged on the lower die head 2, and a first feed pipe 211 communicating with the first material cavity 21; and a gasket 4 arranged between the upper die head 1 and the lower die head 2, further comprising second to nth material cavities 22 ... 2n arranged on the lower die head 2, and second to nth feed pipes 212 ... 21n arranged correspondingly and communicating with the second to nth material cavities 22 ... 2n, and second to nth control valves 222 ... 22n correspondingly arranged on the second to nth feed pipes 212 ... 21n, wherein n is greater than or equal to 0; the gasket 4 is provided with a plurality of partitions 41 extending in the direction of the first flow channel 3 (see Figure 2), the partition 41 includes a first partition 411, a second partition 412..., an m-1th partition 41(m-1) and an mth partition 41m, the number of m is set according to the number of branch channels 31, and m is an integer greater than or equal to 2; the partition 41 separates the second to nth material chambers 22...2n into a plurality of independently controllable branch channels 31, and the branch channels 31 include a first branch channel 311, a second branch channel 312..., a p-1th branch channel 31(p-1) and a pth branch channel 31p, the number of p is set according to the requirement of leaving blank space, and p is an integer greater than or equal to 2; all the second to nth control valves 222...22n are configured so that when the control valve is opened, the corresponding branch channel 31 starts coating, and when the control valve is closed, the corresponding branch channel 31 stops coating.

[0025] In the present invention, n is preferably selected as 0 or 1, so that there can be two or three material chambers. When n=0, there are two material chambers, namely the first material chamber 21 and the second material chamber 22; when n-1, there are three material chambers, namely the first material chamber 21, the second material chamber 22 and the third material chamber, and the same applies to other cases with more than three material chambers. By setting more than two material chambers and controlling them independently, coating of blank spaces of different sizes and densities can be achieved without the need to install additional coating control components, which has the advantages of simple structure and low manufacturing difficulty.

[0026] Preferably, a first control valve 221 is provided on the first feed pipe 211 for controlling the start and end of coating of the first branch channel 311. Generally, the first branch channel 311 is mainly used for continuous coating, while the remaining branch channels are used for corresponding blank coating.

[0027] Preferably, the first control valve 221 is a gap coating control valve, which includes but is not limited to a servo motor-driven gap coating control valve, a pneumatically-driven gap coating control valve or a hydraulically-driven gap coating control valve.

[0028] Preferably, the second to nth control valves 222 . . . 22n are gap coating control valves.

[0029] In order to improve the versatility of the extrusion coating head, the first material cavity 21 and the second to nth material cavities 22 ... 2n are of equal length and are arranged in parallel on the upper bottom surface of the lower die head 2. In this case, in order to prevent the material from flowing between the cavities, the gasket 4 is provided with a spacer 42 for covering the second to nth material cavities 22 ... 2n (see Figure 5The isolation sheet is used to form the first branch channel 311, the second branch channel 312, ..., the p-1 branch channel 31 (p-1) and the p-th branch channel 31p, so that each branch channel can be coated separately, thereby achieving blank spaces of different areas and densities (the formation of blank spaces will be further described below). The gasket 4 is provided with a first feed port 43 corresponding to the first material cavity 21; the gasket 4 is provided with a second feed port 44 corresponding to the second material cavity 22.

[0030] Preferably, the gasket 4 includes at least two gasket layers, which are stacked up and down, wherein the top gasket layer is used to form a separator 41, and the remaining gaskets are used to form an isolation sheet 42 covering the second to nth material cavities 22...2n.

[0031] Preferably, the gasket 4 may also be a layer of gasket, the separator 41 is directly processed on the gasket 4, and the isolation plate used to cover the second to nth material cavities 22...2n is formed by steps processed on the gasket.

[0032] If the lower die head 2 in the present invention is custom-shaped, that is, the positions and lengths of the first material cavity 21 and the second to nth material cavities 22...2n are set according to actual needs, then there is no need to use an isolation sheet to form a diversion channel.

[0033] In order to prevent the position corresponding to the separator 41 from forming a long blank on the substrate along the moving direction of the substrate during coating, in the utility model, on the one hand, the separator 41 is made as narrow as possible, so that the position corresponding to the separator 41 is as narrow as possible; on the other hand, one end of the discharge port 5 of the separator 41 is designed to have a chamfered corner 51 (see Figure 3 ), by adjusting the distance between the discharge port 5 and the substrate on the coating roller, the position corresponding to the separator 41 does not have a long blank during coating.

[0034] Preferably, the utility model further comprises a control system (not shown), wherein the control system is used to control the opening or closing of the control valve according to a predetermined program.

[0035] See also Figure 4 , Figure 4 It is a schematic diagram of the planar structure of the lower die head of the second embodiment of the utility model (only three material cavities are used for illustration. For embodiments with more than three material cavities, it is not difficult to understand them in combination with the following description and will not be repeated here). Figure 4 The embodiments and Figure 1-Figure 3 Compared with the above embodiment, the general structure is the same, except that Figure 1-Figure 3In the embodiment shown, all the material cavities, including the first material cavity 21 and the second to nth material cavities 22 ... 2n, are arranged in parallel on the upper surface of the lower die head 2. In fact, the second to nth material cavities 22 ... 2n can also be formed by one or two material cavities parallel to the first material cavity 21, and a partition plate 20 is arranged in the material cavity, such as Figure 4 In the embodiment, the first material chamber 21 is a whole strip, while the second material chamber 22 and the third material chamber 23 are formed by a strip of material chamber with a partition plate 20 disposed in the middle. This arrangement not only enables the individual control of each material chamber, but also makes the overall volume of the extrusion coating head smaller.

[0036] See also Figure 5 and Figure 6 , Figure 5 and Figure 6 It is a schematic diagram of the three-dimensional exploded structure of the second embodiment of the utility model. Figure 5 and Figure 6 Compared with the embodiment shown in the figure, the general structure is the same, except that Figure 5 and Figure 6 The embodiment shown shows an extrusion coating head including only a first cavity 21 and a second cavity 22 on the die head 2, the gasket 4 is configured with an intermediate isolating member 6 in the middle, the gasket 4 is provided with a first inlet 43 corresponding to the first cavity 21, and forms a first branch channel 311; the gasket 4 is provided with a second inlet 44 corresponding to the second cavity 22, and forms a second branch channel 312. The intermediate isolating member 6 corresponds to Figure 7 The entire middle blank 61 is left, and the second control valve 222 is controlled to open, and the coating is applied through the second branch channel 312 Figure 7 The small area coating position 62 in the middle controls the second control valve 222 to close. Figure 7 The first control valve 221 is controlled to open, and the coating is applied through the first branch channel 311. Figure 7 The large area coating position 64 in the coating position. In this way, it is necessary to open or close the control valve to leave the required blank space in the coating position as required.

[0037] Figure 8 A schematic diagram of another achievable coating effect. Fig. 9 FIG. 1 is a schematic diagram of another coating effect that can be achieved. Figure 8 The effect shown can be achieved by simply changing the second branch channel 312. Fig. 9 The effect shown requires adding a third material chamber and a third control valve, and correspondingly forming a third branch flow channel, which can be achieved by independently controlling the opening and closing time and frequency of the third control valve.

[0038] The utility model also provides a coating device, comprising a substrate feeding mechanism and a coating back roller, wherein an extrusion coating head coats the substrate on the back roller, and the extrusion coating head is the above-mentioned extrusion coating head.

[0039] The utility model also provides a coating method, which utilizes the above-mentioned extrusion coating head to coat the substrate on the coating backing roller. When continuous coating is required on the substrate, the corresponding control valve is opened to coat the substrate on the corresponding branch channel; when blank space is required on the substrate, the corresponding control valve is stopped to leave a blank space on the corresponding branch channel.

[0040] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An extrusion coating head, comprising an upper die head (1) and a lower die head (2); a first flow channel (3) formed between the upper die head (1) and the lower die head (2), the first flow channel (3) being in communication with a first material cavity (21) provided on the lower die head (2), a first material supply pipe (211) being in communication with the first material cavity (21); and a gasket (4) provided between the upper die head (1) and the lower die head (2), characterized in that: It also includes second to nth material chambers (22...2n) arranged on the lower die head (2), and second to nth feed pipes (212...21n) arranged corresponding to and communicating with the second to nth material chambers (22...2n), and second to nth control valves (222...22n) correspondingly arranged on the second to nth feed pipes (212...21n), wherein n is greater than or equal to 0; the gasket (4) is provided with a plurality of partitions (41) extending in the direction of the first flow channel (3), and the partitions (41) divide the second to nth material chambers (22...2n) into a plurality of independently controllable branch flow channels (31), and all the second to nth control valves (222...22n) are configured such that when the control valve is opened, the corresponding branch flow channel (31) starts coating, and when the control valve is closed, the corresponding branch flow channel (31) stops coating.

2. The extrusion coating head according to claim 1, characterized in that: A first control valve (221) is provided on the first supply pipe (211).

3. The extrusion coating head according to claim 1, characterized in that: The second to nth control valves (222...22n) are gap coating control valves.

4. The extrusion coating head according to claim 2, characterized in that: The first control valve (221) is a gap coating control valve.

5. The extrusion coating head according to any one of claims 1 to 4, characterized in that: The gasket (4) is provided with an isolation sheet for covering the second to nth material cavities (22...2n).

6. The extrusion coating head according to claim 5, characterized in that: The gasket (4) comprises at least two gasket layers, the multiple gasket layers are stacked up and down, wherein the top gasket layer is used to form a separator (41), and the remaining gaskets are used to form an isolation sheet covering the second to nth material cavities (22...2n).

7. The extrusion coating head according to any one of claims 1 to 4, characterized in that: The gasket (4) comprises at least two gasket layers, the multiple gasket layers are stacked up and down, wherein the top gasket layer is used to form a separator (41), and the remaining gaskets are used to form an isolation sheet covering the second to nth material cavities (22...2n).

8. The extrusion coating head according to any one of claims 1 to 4, characterized in that: It also includes a control system, which is used to control the control valve to open or close according to a predetermined program.

9. A coating device, characterized in that: It comprises a substrate feeding mechanism and a coating back roller, wherein an extrusion coating head is used to coat the substrate on the back roller, and the extrusion coating head is the extrusion coating head described in any one of claims 1 to 8.

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