A film casting oil suction device and a film casting apparatus

Abstract

This application relates to the technical field of lithium battery separator production equipment, and more specifically to a film casting oil absorption device and film casting equipment. The film casting oil absorption device includes a negative pressure shell, an air duct, and an adsorption component. The negative pressure shell is disposed on one side of the forming roller and the die head, and has a negative pressure chamber inside. The negative pressure chamber has a suction port, which is positioned opposite to the forming roller. The air duct is configured to suction the negative pressure chamber. The air duct and the suction port are positioned opposite each other at both ends of the negative pressure shell. The adsorption component is configured to adsorb oil stains in the negative pressure chamber. The adsorption component is disposed on the inner wall of the negative pressure shell and is located close to the suction port. The negative pressure adsorption achieves the adsorption and cleaning of oil mist. The adsorption component can adsorb and store residual oil mist in the negative pressure shell, thereby preventing oil mist dripping and causing defects in the film and equipment. This effectively ensures the quality of subsequent film production. Furthermore, the adsorption component can delay oil dripping, extend the oil stain treatment cycle, and thus improve the equipment's uptime.

Description

Technical Field

[0001] This application relates to the field of thin film production technology, and more specifically to a thin film casting oil absorption device and a thin film casting equipment. Background Technology

[0002] Film casting equipment generally includes an extrusion die and a forming roller, with the die having a narrow extrusion slit. During operation, molten polymer material is extruded from the narrow extrusion slit and flows onto the circumferential surface of the casting roller for cooling and shaping. During this process, oil mist is easily drawn out, which can cause contamination on the roller surface and film surface, affecting the quality of the film. Utility Model Content

[0003] This application provides a thin film casting oil suction device and a thin film casting equipment, which can at least partially solve or improve the above-mentioned technical problems.

[0004] This application provides a film casting oil absorption device, comprising:

[0005] A negative pressure shell is disposed on one side of the forming roller and the die head. The negative pressure shell has a negative pressure cavity and a suction port, which is disposed opposite to the forming roller.

[0006] A duct is configured to draw air from the negative pressure chamber; the duct and the suction port are positioned opposite each other at both ends of the negative pressure chamber; and

[0007] An adsorption element is configured to adsorb oil stains in the negative pressure chamber; the adsorption element is disposed on the inner wall of the negative pressure shell and is located near the suction port.

[0008] In some optional embodiments, the negative pressure shell includes a main body and an extension. One end of the main body is connected to the air duct, and the other end is connected to the extension. The extension extends along the tangent of the forming roller and is disposed between the forming roller and the die head. The adsorption member is disposed within the extension.

[0009] In some optional embodiments, the negative pressure shell further includes a negative pressure air chamber plate, one end of which is disposed within the main body and the other end extends into the extension portion. The adsorption member is detachably disposed at one end of the negative pressure air chamber plate located in the extension portion and is disposed on the side of the negative pressure air chamber plate facing the suction port.

[0010] In some alternative embodiments, the negative pressure air chamber plate is detachably connected to the main body and the extension.

[0011] In some alternative embodiments, the suction port has an arc-shaped structure and covers at least a portion of the circumferential surface of the forming roller.

[0012] In some optional embodiments, the film casting oil suction device further includes a mounting base, through which the negative pressure shell is mounted on the film casting equipment.

[0013] In some optional embodiments, the negative pressure shell has an installation opening on the side opposite to the adsorption member, the mounting seat is disposed at the installation opening, and the mounting seat and the negative pressure shell enclose the negative pressure cavity.

[0014] In some alternative embodiments, the adsorption element is constructed of a high-temperature resistant porous material.

[0015] In some alternative embodiments, the high-temperature resistant porous material includes fibrous materials and / or ceramic materials.

[0016] This application provides a thin film casting apparatus, including the thin film casting oil suction device as described above.

[0017] The film casting oil absorption device according to this embodiment includes a negative pressure shell, an air duct, and an adsorption component. The air duct and the negative pressure shell work together to achieve the adsorption and cleaning of oil mist using negative pressure adsorption. The adsorption component can adsorb and store the residual oil mist in the negative pressure shell, thereby preventing oil mist from dripping and causing defects in the film and equipment. This can effectively ensure the quality of subsequent film production. Furthermore, the adsorption component can delay oil dripping, extend the oil treatment cycle, and thus improve the equipment's uptime. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation of the film casting oil absorption device in one embodiment;

[0019] Figure 2 This is a schematic diagram of the structure of a film casting oil absorption device in one embodiment;

[0020] Figure 3 This is a cross-sectional view of the structure of a thin film casting oil absorption device in one embodiment;

[0021] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of a negative pressure air chamber plate in one embodiment.

[0023] The components include: 1. Film casting oil suction device; 100. Negative pressure shell; 110. Negative pressure chamber; 111. Suction port; 120. Main body; 130. Extension; 140. Negative pressure air chamber plate; 141. First section; 142. Second section; 143. Third section; 150. Mounting opening; 200. Air duct; 300. Adsorption component; 400. Mounting base; 500. Fixing component;

[0024] 2. Forming roller;

[0025] R, radial; T, tangent. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0027] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0028] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0029] Film casting equipment is specialized equipment used to produce various film materials. It includes an extrusion system, a die system, a cooling system, and a traction and winding system. The extrusion system mainly consists of an extruder, which heats and plasticizes the polymer raw material and extrudes it, providing a uniform melt with a certain pressure and flow rate for casting. The die system typically uses a T-die or a slit die, allowing the melt or solution to flow uniformly from the slit of the die, forming a thin and uniform cast layer. For melt casting, a forming roller (or cooling roller) is a commonly used cooling system. The cast film is in close contact with the surface of the forming roller, rapidly carrying away heat through conduction, allowing the film to solidify and set. The traction device in the traction and winding system is used to pull the cast film from the die or cooling system and control the film's running speed and tension. The winding device in the traction and winding system neatly winds the pulled film into a roll for subsequent storage and processing.

[0030] During the film casting process, there is a risk of oil mist precipitation. If this oil mist is not treated, it will affect the quality and performance of the film, as well as the performance and quality of the products produced subsequently.

[0031] To address this issue, embodiments of this application provide a film casting oil absorption device that utilizes negative pressure adsorption to clean oil mist, preventing oil mist droplets from causing defects in the film and equipment.

[0032] Please see Figures 1 to 5 The film casting oil absorption device 1 includes a negative pressure shell 100, an air duct 200, and an adsorption element 300. The negative pressure shell 100 is disposed on one side of the forming roller 2 and the die head (i.e., the extrusion die head, the same below). The negative pressure shell 100 has a negative pressure cavity 110, and the negative pressure cavity 110 has a suction port 111. The suction port 111 is disposed opposite to the forming roller 2. The air duct 200 is configured to suction the negative pressure cavity 110. The air duct 200 and the suction port 111 are disposed opposite to each other at both ends of the negative pressure shell 100. The adsorption element 300 is configured to adsorb the oil stains in the negative pressure cavity 110. The adsorption element 300 is disposed on the inner wall of the negative pressure shell 100 and is disposed close to the suction port 111.

[0033] The negative pressure shell 100 can be understood as an assembly of multiple components. It is used to cover the forming roller 2, and at least part of its structure is positioned relative to the die head. The negative pressure shell 100 provides a negative pressure chamber 110 for negative pressure suction. The negative pressure shell 100 has openings at opposite ends. One opening is used to install the air duct 200, and the other is a suction port 111. The suction port 111 covers part of the surface of the forming roller 2 and the position of the die head outlet, so that the air duct 200 can draw gas from the negative pressure chamber 110 to adsorb oil mist on the forming roller 2 and the die head by using negative pressure.

[0034] It is understandable that after the duct 200 sucks out the oil mist, some oil mist will remain in the negative pressure chamber 110. This oil mist is adsorbed on the inner wall of the negative pressure shell 100. Over time, the oil mist will gather into large droplets, which may fall off. In addition, since the suction port 111 is facing the forming roller 2 and the die head, a lot of droplets will fall onto the forming roller 2 under the action of gravity, which will affect the subsequent film production.

[0035] This application provides an adsorption element 300 in the negative pressure chamber 110. The adsorption element 300 can adsorb, gather and store oil mist, which can prevent oil mist from dripping, thereby effectively ensuring the quality of subsequent film production. In addition, the adsorption element 300 can delay oil dripping and extend the oil treatment cycle, thereby improving the equipment's uptime.

[0036] Please see Figure 3In some embodiments, the negative pressure shell 100 includes a main body 120 and an extension 130. One end of the main body 120 is connected to a duct 200, and the other end is connected to the extension 130. The extension 130 extends along the tangent T of the forming roller 2 and is disposed between the forming roller 2 and the die head. The adsorption member 300 is disposed within the extension 130. In a specific example, the main body 120 extends radially R along the forming roller 2, and the extension 130 is disposed at the end of the main body 120 near the forming roller 2 and extends along the tangent T of the forming roller 2, to be roughly constructed in a boot shape. Since the gap between the die head and the forming roller 2 is an area where oil mist is easily generated and accumulated, the smaller size of the extension 130 allows it to extend into the gap between the die head and the forming roller 2, more effectively capturing and adsorbing oil mist, reducing the diffusion of oil mist in the production environment, thereby reducing oil mist pollution to equipment and the surrounding environment, and reducing pollution to the film.

[0037] In some embodiments, the main body 120 and the extension 130 of the negative pressure housing 100 are detachably connected, and the main body 120 and the extension 130 are assembled into an integral structure, which can reduce the assembly difficulty of the negative pressure housing 100. Specifically, since the film casting oil absorption device 1 has a large overall volume and weight, multiple people are required to cooperate during the overall assembly, and the assembly difficulty is relatively high. By setting the negative pressure housing 100 as multiple detachable parts, they can be assembled sequentially on the film casting equipment, which can reduce the assembly difficulty and effectively improve the assembly efficiency.

[0038] Of course, in other embodiments, the main body 120 and the extension 130 may also be constructed as an integral structure.

[0039] Please continue reading. Figure 3 In some embodiments, the negative pressure shell 100 further includes a negative pressure air chamber plate 140, one end of which is disposed in the main body 120 and the other end extends into the extension 130. The adsorption member 300 is detachably disposed at one end of the negative pressure air chamber plate 140 located in the extension 130 and is disposed on the side of the negative pressure air chamber plate 140 facing the suction port 111.

[0040] It is understandable that oil mist, after condensation, possesses a certain degree of adsorption and viscosity, generally adsorbing onto the inner wall of the negative pressure shell 100 and flowing downwards along the inner wall under gravity. To avoid affecting film production, the film casting oil suction device 1 is positioned on one side of the die head and forming roller 2, and is positioned above the forming roller 2. The main body 120 of the negative pressure shell 100 is positioned above the extension 130. Therefore, a significant amount of oil mist accumulates at the extension 130 and the suction element 300. This application detachably mounts the suction element 300 onto the negative pressure air chamber plate 140, allowing for disassembly and cleaning or replacement as needed, thus preventing the oil mist accumulated on the suction element 300 from dripping. Furthermore, disassembling the suction element 300 avoids cleaning the entire negative pressure shell 100, significantly reducing the complexity and manpower required for cleaning, improving cleaning efficiency, and minimizing structural damage caused by cleaning the negative pressure shell 100. Since there is no need to clean the entire negative pressure shell 100, the process of disassembling and installing the adsorption component 300 is faster and the cleaning cycle is shorter, reducing the downtime of the equipment due to maintenance and cleaning, and effectively improving the effective operating time and production efficiency of the equipment.

[0041] In some embodiments, the negative pressure air chamber plate 140 is detachably connected to the main body 120 and the extension 130. Based on the working characteristics of the film casting oil absorption device 1, oil mist is more concentrated on the side wall near the die head. This side wall is provided with a detachable negative pressure air chamber plate 140. By disassembling the negative pressure air chamber plate 140, the interior of the negative pressure shell 100 can be cleaned, avoiding oil mist accumulation. Targeted disassembly of the negative pressure air chamber plate 140 for cleaning can also reduce damage to the overall structure of the negative pressure shell 100.

[0042] Please see Figure 4 In some embodiments, the negative pressure air chamber plate 140 is detachably connected to the main body 120 and the extension 130, and the adsorption member 300 is detachably connected to the negative pressure air chamber plate 140. This allows the adsorption member 300 to be selectively disassembled alone, or the negative pressure air chamber plate 140 and the adsorption member 300 to be disassembled together, depending on the oil mist accumulation. For example, when there is less oil mist accumulation, the adsorption member 300 can be disassembled alone for cleaning or replacement; when there is more oil mist accumulation, the negative pressure air chamber plate 140 can be disassembled for cleaning, and the adsorption member 300 can be cleaned or replaced.

[0043] In this application, "detachable" connection methods include bolted connections, adhesive bonding, snap-fit ​​connections, or coating application. For example... Figure 4 As shown, the adsorption component 300 is detachably connected to the negative pressure air chamber plate 140 via a fixing component 500, which can be a bolt or a screw.

[0044] Please see Figure 5In some embodiments, the negative pressure air chamber plate 140 is fitted to the inner wall of the negative pressure shell 100 and is divided into a first segment 141, a second segment 142, and a third segment 143 along the direction from the main body 120 to the extension 130. The second segment 142 connects the first segment 141 and the third segment 143. The first segment 141, the second segment 142, and the third segment 143 are all inclined relative to the vertical direction to guide oil mist to the adsorption element 300. The smooth transition between the first segment 141, the second segment 142, and the third segment 143 can reduce the accumulation of oil mist at the transition point. The angle at which the first segment 141, the second segment 142, and the third segment 143 are inclined relative to the vertical direction can be 5°-60°, and the specific angle design can be determined according to the specific usage environment and requirements. For example, the first segment 141 extends along the radial direction R of the forming roller 2, that is, it is arranged parallel to the main body 120 of the negative pressure shell 100, and the third segment 143 extends along the tangent T direction of the forming roller 2, that is, it is arranged parallel to the extension 130 of the negative pressure shell 100.

[0045] In some embodiments, the suction port 111 has an arc-shaped structure and covers at least part of the circumferential surface of the forming roller 2, which can increase the relative area with the forming roller 2, thereby improving the adsorption effect.

[0046] It should be noted that in this application, "covering" refers to non-contact covering, that is, the suction port 111 covers the forming roller 2 in space, or it can be understood as the orthographic projection of the suction port 111 on the circumferential surface of the forming roller 2 contacting and covering the circumferential surface of the forming roller 2.

[0047] Please see Figure 3 In some embodiments, the film casting oil suction device 1 further includes a mounting base 400, through which the negative pressure shell 100 is mounted on the film casting equipment, and the mounting base 400 supports the entire negative pressure shell 100. In a specific example, the mounting base 400 and the film casting equipment are detachably connected.

[0048] Please see Figure 3In some embodiments, the negative pressure shell 100 has an installation opening 150 on the side opposite to the adsorption member 300. A mounting base 400 is disposed at the installation opening 150 and is at least partially inserted into the negative pressure shell 100, forming a negative pressure cavity 110. The mounting base 400 not only supports the entire negative pressure shell 100 but also forms the negative pressure cavity 110. The insertion of the mounting base 400 into the negative pressure shell 100 improves the stability of the connection between the mounting base 400 and the negative pressure shell 100, thus providing better support for the negative pressure shell 100. In some specific examples, the mounting base 400 can also serve as part of the cavity wall of the negative pressure cavity 110. The mounting base 400 covers the installation opening 150 and forms the negative pressure cavity 110 with the negative pressure shell 100, which simplifies the structure of the film casting oil absorption device 1, reduces assembly difficulty, and lowers the weight and volume of the film casting oil absorption device 1. The mounting base 400 and the negative pressure shell 100 are detachably connected. During assembly, the mounting base 400 is first assembled to position the negative pressure shell 100, and then the various components of the negative pressure shell 100 are installed in sequence to form an integrated structure.

[0049] Of course, the mounting base 400 and the negative pressure shell 100 can also be a single integrated structure, which can be installed as a whole on the film casting equipment.

[0050] In some embodiments, the adsorbent 300 is constructed from a high-temperature resistant porous material. Due to the process characteristics of thin-film casting production, the ambient temperature during operation of the thin-film casting oil absorption device 1 is relatively high. Making the adsorbent 300 from a high-temperature resistant material improves its stability and service life under high-temperature conditions, thereby enhancing the adsorption effect of the thin-film casting oil absorption device 1. The porous material of the adsorbent 300 creates numerous capillary channels within its rich pore structure. When oil mist passes through, the oil mist particles are firmly adsorbed onto the inner walls of the pores due to capillary forces, preventing easy detachment. Simultaneously, the interconnected pore network provides ample storage space for the adsorbed oil mist, extending the service life of the adsorbent 300 and reducing the frequency of cleaning or replacement. Furthermore, this porous structure increases the contact area between the adsorbent 300 and the oil mist, allowing more oil mist particles to be captured, further enhancing the purification effect on the oil mist. This is particularly suitable for scenarios such as thin-film casting production where the oil mist concentration is high and continuous adsorption is required.

[0051] In some embodiments, the high-temperature resistant porous material includes fibrous materials and / or ceramic materials. Exemplary examples include alumina ceramics, zirconia ceramics, or silicon carbide ceramics.

[0052] In some embodiments, the duct 200 is constructed of stainless steel and has a relatively smooth inner wall, which can reduce the resistance during suction, ensure smooth passage of oil mist, and thus improve the adsorption and cleaning effect.

[0053] In some embodiments, the duct 200 is connected to a suction pump (not shown) to provide suction power.

[0054] In use, the extension 130 of the negative pressure shell 100 is inserted into the gap between the die head and the forming roller 2 along the tangent T of the forming roller 2, so that the suction port 111 can accurately cover the high-oil-mist area (the melt casting section at the die head outlet and the film bonding area of ​​the forming roller 2). After the negative pressure chamber 110 is connected to the suction pump through the air duct 200, a stable negative pressure is formed inside, which can quickly suck the dispersed oil mist into the chamber and prevent it from spreading to the workshop environment. The adsorption component 300, made of high-temperature resistant porous material, is fixed to the inner wall of the extension 130 of the negative pressure shell 100 and faces the suction port 111. Its porous structure adsorbs the residual oil mist that is not sucked away by the air duct 200 through capillary action, and at the same time stores the condensed oil, preventing it from dripping onto the forming roller 2 or the film surface due to gravity. The adsorption component 300 can be disassembled, which can extend the oil mist cleaning cycle, shorten the equipment downtime, and thus improve the equipment's uptime.

[0055] The embodiments of this application also provide a thin film casting apparatus, including the thin film casting oil suction device 1 in the above embodiments. The thin film casting oil suction device 1 has been described in detail above and will not be repeated here.

[0056] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A film casting oil absorption device, characterized in that, include: A negative pressure shell is disposed on one side of the forming roller and the die head. The negative pressure shell has a negative pressure cavity and a suction port, which is disposed opposite to the forming roller. A duct is configured to draw air from the negative pressure chamber; the duct and the suction port are positioned opposite each other at both ends of the negative pressure shell. as well as An adsorption element is configured to adsorb oil stains in the negative pressure chamber; the adsorption element is disposed on the inner wall of the negative pressure shell and is located near the suction port.

2. The film casting oil absorption device according to claim 1, characterized in that, The negative pressure shell includes a main body and an extension. One end of the main body is connected to the air duct, and the other end is connected to the extension. The extension extends along the tangent of the forming roller and is disposed between the forming roller and the die head. The adsorption member is disposed in the extension.

3. The film casting oil absorption device according to claim 2, characterized in that, The negative pressure shell also includes a negative pressure air chamber plate, one end of which is disposed inside the main body and the other end extends into the extension. The adsorption member is detachably disposed at one end of the negative pressure air chamber plate located in the extension and is disposed on the side of the negative pressure air chamber plate facing the suction port.

4. The film casting oil absorption device according to claim 3, characterized in that, The negative pressure air chamber plate is detachably connected to the main body and the extension.

5. The film casting oil absorption device according to claim 1, characterized in that, The suction port has an arc-shaped structure and covers at least a portion of the circumferential surface of the forming roller.

6. The film casting oil suction device according to claim 1, characterized in that, The film casting oil suction device also includes a mounting base, and the negative pressure shell is mounted on the film casting equipment through the mounting base.

7. The film casting oil absorption device according to claim 6, characterized in that, The negative pressure shell has an installation opening on the side opposite to the adsorption element, and the mounting base is disposed at the installation opening, and the mounting base and the negative pressure shell enclose the negative pressure cavity.

8. The film casting oil suction device according to claim 1, characterized in that, The adsorption element is constructed from a high-temperature resistant porous material.

9. The film casting oil suction device according to claim 8, characterized in that, The high-temperature resistant porous material includes fiber materials and / or ceramic materials.

10. A thin film casting apparatus, characterized in that, Includes the film casting oil absorption device as described in any one of claims 1-9.

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