Novel coating unit with adjustable longitudinal width

Abstract

The embodiment of the utility model provides a novel coating unit capable of adjusting the longitudinal width. The novel coating unit comprises a feed liquid containing mechanism, a back roller and an adjusting mechanism. The feed liquid containing mechanism comprises a back plate and a scraper which are oppositely arranged, the back plate and the scraper form a feed liquid tank, the feed liquid tank is used for containing feed liquid, a liquid outlet is formed in the bottom of the feed liquid tank, and the scraper is configured to scrape the feed liquid on the surface of the film base material; the back roller is arranged at the bottom of the liquid outlet, the film base material is attached to the back roller and moves to one side of the scraper along one side of the back plate, and the film base material completely covers the liquid outlet in the longitudinal direction of the scraper; the adjusting mechanism is rotationally arranged at the end, opposite to the liquid outlet, of the back plate, the coiled material is coiled on the adjusting mechanism, the coiled material sequentially passes through the outer side wall of the back plate and the lower portion of the back plate to be wound on the surface of the film base material located on the surface of the back roller through the adjusting mechanism, and the coiled material covers the film base material located at the liquid outlet along the longitudinal part of the scraper. And the material liquid flows to the film base material between the moving end of the coiled material and the scraper.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of flat membrane production, and in particular to a novel coating unit with adjustable longitudinal width. BACKGROUND

[0002] As an important separation and filtration material, flat membranes are widely used in water treatment, chemical industry, medicine and other fields. According to structural characteristics, flat membranes are mainly divided into two categories: unsupported membranes and supported membranes. Unsupported membranes are directly composed of membrane materials and have higher permeability and separation efficiency. Supported membranes usually have one or more support structures to improve the mechanical strength and stability of the membranes. Regardless of the type of flat membrane, the production process requires that the feed liquid be uniformly and stably coated.

[0003] In the production technology of flat membranes, the coating unit is one of the core components of the production equipment. The doctor blade coating unit usually includes a doctor blade and a back plate. The doctor blade and the back plate form a feed liquid tank, and one end of the doctor blade and the back plate forms a liquid outlet to coat the feed liquid onto the membrane substrate for producing flat membranes. When producing a support membrane with non-woven fabric as the membrane substrate, the feed liquid often penetrates the non-woven fabric quickly, resulting in uneven membrane layers with large pores on the upper layer and uneven surfaces on the lower non-woven fabric layer. At this time, a smaller feed liquid tank can be used to reduce the actual contact area between the feed liquid in the feed liquid tank and the membrane substrate, preventing the feed liquid from completely penetrating the non-woven fabric and ensuring that the feed liquid is uniformly and stably distributed on the substrate membrane surface, thereby improving the production quality and uniformity of the membrane.

[0004] However, the related art usually adjusts the distance between the doctor blade and the back plate, which greatly reduces the amount of feed liquid that can be contained in the feed liquid tank. CONTENT OF THE INVENTION

[0005] The application provides a novel coating unit with adjustable longitudinal width to solve the technical problem of preventing the feed liquid from penetrating the membrane substrate in large quantities in the related art by reducing the actual contact area between the feed liquid in the feed liquid tank and the membrane substrate.

[0006] The application provides a flat membrane production device, which includes a feed liquid containing mechanism, a back roller and an adjusting mechanism.

[0007] The feed liquid containing mechanism includes a back plate and a doctor blade arranged opposite to each other. The back plate and the doctor blade form a feed liquid tank for containing feed liquid. The bottom of the feed liquid tank is provided with a liquid outlet. The doctor blade is configured to scrape the feed liquid on the surface of the membrane substrate.

[0008] The back roller is arranged at the bottom of the liquid outlet. The membrane substrate is attached to the back roller and moves along the side of the back plate to the side of the doctor blade. The membrane substrate completely covers the liquid outlet along the longitudinal direction of the doctor blade.

[0009] The adjusting mechanism is rotationally arranged at one end of the back plate away from the liquid outlet, and the roll material is arranged on the adjusting mechanism. The roll material is sequentially arranged on the surface of the film substrate on the surface of the back roller via the outer side wall of the back plate and below the back plate by the adjusting mechanism. The roll material covers the film substrate at the liquid outlet along the longitudinal portion of the scraper, so that the material liquid flows between the moving end of the roll material and the scraper to the film substrate.

[0010] In a possible implementation, the adjusting mechanism comprises a rotating shaft and a buckle. The rotating shaft is rotationally arranged at one end of the back plate away from the liquid outlet.

[0011] The roll material is sleeved on the rotating shaft, and the buckle is arranged at both ends of the roll material to fix the roll material to the rotating shaft.

[0012] In a possible implementation, the roll material is a flexible plastic film, and the roll material is made of any one of PP or PET.

[0013] In a possible implementation, the adjusting mechanism further comprises a cutting assembly. The cutting assembly comprises a track and a blade. The track is arranged along the back plate, and the blade is slidingly arranged along the track for cutting the roll material.

[0014] In a possible implementation, the material liquid containing mechanism further comprises a cover plate. The cover plate and the liquid outlet are oppositely arranged. The surface of the cover plate of the material liquid containing mechanism is provided with a feeding opening for adding material liquid into the material liquid tank.

[0015] In a possible implementation, the surface of the cover plate is further provided with a visualization window for observing the liquid level of the material liquid in the material liquid tank.

[0016] The application discloses a novel adjustable longitudinal width coating unit. In the application, the film substrate can be tightly attached to the surface of the back roller for coating the material liquid by arranging the back roller. The roll material is sequentially arranged on the surface of the film substrate on the surface of the back roller via the outer side wall of the back plate and below the back plate by the adjusting mechanism. The roll material covers the film substrate at the liquid outlet along the longitudinal portion of the scraper, so that the material liquid flows between the moving end of the roll material and the scraper to the film substrate. The distance between the moving end of the roll material and the scraper can be adjusted by rotating the adjusting mechanism, and the contact area between the material liquid and the film substrate can be adjusted, so that the material liquid can be uniformly and stably coated on the surface of the film substrate during the production process, thereby improving the production quality of the flat film. The actual contact width of the material liquid and the film substrate in the material liquid tank can be accurately adjusted by the application, thereby solving the problem of large penetration of low-viscosity material liquid into the film substrate. The actual amount of material liquid contained in the material liquid tank does not change significantly, and the large-scale production demand can be met. A novel adjustable longitudinal width coating unit is provided, which can improve the production quality of the flat film and ensure the amount of material liquid contained in the material liquid tank. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a novel adjustable width coating unit provided in an embodiment of this application;

[0019] Figure 2 yes Figure 1 The front view.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100-Feed liquid receiving mechanism; 200-Back roller; 300-Adjusting mechanism; 400-Coagulation tank; 500-Membrane substrate; 600-Roll material; 700-Feed liquid;

[0022] 110 - Back plate; 120 - Scraper; 130 - Liquid tank; 140 - Liquid outlet; 150 - Cover plate; 151 - Feeding port; 152 - Visualization window;

[0023] 310 - Rotating shaft; 311 - Snap fastener; 320 - Cutting assembly; 321 - Track; 322 - Blade. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0025] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0026] In the description of the application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium.

[0027] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through excessive structure, but only through the connection structure to form an integral whole. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0028] In this application, the description related to "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features.

[0029] Flat sheet membranes are widely used in water treatment, chemical industry, pharmaceutical industry and other fields as an important separation and filtration material. Flat sheet membranes are mainly divided into two categories: unsupported membranes and supported membranes according to their structural characteristics. Unsupported membranes are directly composed of membrane materials, which have higher permeability and separation efficiency. Supported membranes usually have one or more support structures to improve the mechanical strength and stability of the membranes. Whether it is which type of flat sheet membrane, the production process requires that the feed liquid can be uniformly and stably coated.

[0030] In the flat film production technology, the coating unit is one of the core components in the production equipment, and the doctor blade coating unit usually includes a doctor blade and a back plate, the doctor blade and the back plate form a liquid tank, and one end of the doctor blade and the back plate forms a liquid outlet to coat the liquid on the film substrate for producing flat film. When using low viscosity liquid to produce non-woven fabric as the supporting film of the film substrate, the liquid often penetrates into the non-woven fabric quickly, resulting in uneven film layer on the upper layer and uneven surface of the lower non-woven fabric layer. At this time, a smaller liquid tank can be used to reduce the actual pressure contact area of the liquid in the liquid tank and the film substrate, so as to prevent the liquid from completely penetrating through the non-woven fabric and ensure that the liquid can be uniformly and stably distributed on the surface of the base film, thereby improving the production quality and uniformity of the film.

[0031] However, the related art usually adjusts the distance between the doctor blade and the back plate, which greatly reduces the amount of liquid that can be contained in the liquid tank.

[0032] The embodiment of the present application provides a novel coating unit with adjustable longitudinal width to solve the technical problem of large amount of low viscosity liquid penetrating into the film substrate in the related art.

[0033] Figure 1 is a structural schematic diagram of a novel coating unit with adjustable longitudinal width provided by an embodiment of the present application; Figure 2 is Figure 1 front view of

[0034] The embodiment of the present application provides a novel coating unit with adjustable longitudinal width, referring to Figure 1 and Figure 2 , including a liquid containing mechanism 100, a back roller 200 and an adjusting mechanism 300;

[0035] The liquid containing mechanism 100 includes a back plate 110 and a doctor blade 120 arranged oppositely, the back plate 110 and the doctor blade 120 form a liquid tank 130, the liquid tank 130 is used to contain liquid, the bottom of the liquid tank 130 is provided with a liquid outlet 140, and the doctor blade 120 is configured to scrape the liquid on the surface of the film substrate 500;

[0036] The back roller 200 is arranged at the bottom of the liquid outlet 140, the film substrate 500 is attached to the back roller 200 and moves along one side of the back plate 110 to the side of the doctor blade 120, and the film substrate 500 completely covers the liquid outlet 140 along the longitudinal direction of the doctor blade 120;

[0037] The adjusting mechanism 300 is arranged at one end of the back plate 110 away from the liquid outlet 140, and the roll material 600 is wound on the adjusting mechanism 300. The roll material 600 is wound on the surface of the film substrate 500 on the surface of the back roller 200 through the outer side wall of the back plate 110 and under the back plate 110 in sequence by the adjusting mechanism 300. The roll material 600 covers the film substrate 500 at the liquid outlet 140 along the longitudinal part of the scraper 120, so that the material liquid flows to the film substrate 500 between the moving end of the roll material 600 and the scraper 120.

[0038] It should be noted that in specific implementation, the two ends of the film substrate 500 away from the liquid outlet 140 are provided with first and second rotating shafts, and the two ends of the film substrate 500 are wound on the first and second rotating shafts respectively to drive the film substrate 500 to move from one side of the back plate 110 to one side of the scraper 120 at the liquid outlet 140.

[0039] It should be further noted that the head of the scraper 120 is arranged towards the liquid outlet 140. When the film substrate 500 moves from one side of the back plate 110 to one side of the scraper 120 along the back roller 200, and the liquid outlet 140 discharges the material liquid for coating, the end of the scraper 120 towards the back roller 200 can scrape the material liquid 700 on the surface of the film substrate 500.

[0040] In specific implementation, the back roller 200 can support the film substrate 500 and the roll material 600. During the coating of the material liquid 700 on the surface of the film substrate 500, one side of the roll material 600 contacts the material liquid 700, and the other side contacts the film substrate 500. The film substrate 500 moves from one side of the back plate 110 to one side of the scraper 120 on the surface of the back roller, so that the two sides of the roll material 600 are subjected to sliding friction of the material liquid 700 and the film substrate 500, so that the roll material 600 remains flat and does not slide, and the coated surface of the film substrate 500 is more uniform and stable.

[0041] In actual use, the material liquid tank 130 contains low-viscosity material liquid 700, the film substrate 500 is tightly attached to the surface of the back roller 200, the roll material 600 is wound on the adjusting mechanism 300, the adjusting mechanism 300 is opened, the adjusting mechanism 300 rotates and drives the roll material 600 to be wound out and move along the outer side wall of the material liquid tank 130 to the back roller 200, so that the roll material 600 covers part of the surface of the film substrate 500. The material liquid 700 flows to the film substrate 500 between the scraper and the moving end of the roll material 600, and the film substrate 500 moves from one side of the back plate 110 to one side of the scraper 120 in the width direction of the liquid outlet 140 during the coating of the material liquid 700.

[0042] From the above description, it can be seen that the present scheme achieves the following technical effects:

[0043] The application discloses a novel adjustable longitudinal and width coating unit, in the application, the film base material 500 is coated on the surface of the back roller 200 through the setting of the back roller 200. The application adjusts the distance between the moving end of the roll material 600 and the scraper 120 by rotating the adjusting mechanism 300, thereby adjusting the flow of the liquid 700 and the contact area between the liquid 700 and the film base material 500, so that the liquid 700 can be uniformly and stably coated on the surface of the film base material 500 in the production process, thereby improving the production quality of the flat film. Through the setting of the application, the actual contact width of the liquid in the liquid tank 130 and the film base material 500 can be accurately adjusted, thereby solving the problem of large penetration of low-viscosity liquid into the film base material 500, and the actual liquid holding capacity of the liquid tank 130 does not change obviously, which can meet the large-scale production demand. A novel adjustable longitudinal and width coating unit which can improve the production quality of the flat film and ensure the liquid holding capacity of the liquid tank 130 is provided.

[0044] In some examples, the adjusting mechanism 300 comprises a rotating shaft 310 and a buckle 311, the rotating shaft 310 is rotatably arranged at one end of the back plate 110 away from the liquid outlet 140.

[0045] The roll material 600 is sleeved on the rotating shaft 310, and the buckle 311 is arranged at both ends of the roll material 600 to fix the roll material 600 on the rotating shaft 310.

[0046] For example, recessed grooves are arranged on both sides of the back plate 110 and are matched with both ends of the rotating shaft 310, so that the rotating shaft 310 rotates in the recessed grooves.

[0047] In the application, the rotating shaft 310 is arranged at one end of the back plate 110 away from the liquid outlet 140, when the roll material 600 is wound on the rotating shaft 310, the roll material 600 can be laid on the surface of the film base material 500 through the outer side wall of the back plate 110 and under the back plate 110, so that the liquid 700 entering the surface of the film base material 500 can be adjusted to be uniformly and stably coated on the surface of the film base material 500.

[0048] For example, the roll material 600 is a flexible plastic film, and the roll material 600 is made of any one of PP or PET.

[0049] The embodiment of the present application sets the roll material 600 as a plastic film. When the roll material 600 is laid on the surface of the film base material 500 by the rotating shaft 310 in turn via the outer side wall of the back plate 110 and under the back plate 110, the flow of the material liquid 700 from one side of the back plate 110 to the surface of the film base material 500 can be avoided, that is, the material liquid 700 is isolated. Further, the flow of the material liquid 700 from the moving end of the roll material 600 and the scraper 120 to the surface of the film base material 500 can be regulated, so that the material liquid 700 is uniformly and stably coated on the surface of the film base material 500.

[0050] In some other examples, the adjusting mechanism 300 further includes a cutting assembly 320, which includes a track 321 arranged along the back plate 110 and a blade 322 slidingly arranged along the track 321 for cutting the roll material 600.

[0051] The embodiment of the present application sets the cutting assembly 320, which includes the track 321 and the blade 322. When the roll material 600 is arranged on the outer side wall of the rotating shaft 310, a segment of the roll material 600 is pulled out, and the blade 322 is moved along the track 321 to cut the segment of the roll material 600 flat. After the coating is completed, the blade 322 is also moved along the track 321 to cut off the used part of the roll material 600.

[0052] For example, the outlet end of the scraper 120 is inclined to scrape the material liquid 700 on the surface of the film base material 500 flat.

[0053] For example, the blade head of the scraper 120 is arranged towards the liquid outlet 140.

[0054] The embodiment of the present application inclines the outlet end of the scraper 120. When the film base material 500 moves along the back roller 200 from one side of the back plate 110 to the side of the scraper 120, and the liquid outlet 140 discharges the liquid for coating, the outlet end of the second side wall can scrape the material liquid 700 on the surface of the film base material 500 flat.

[0055] In another implementation, the material liquid 700 containing mechanism 100 further includes a cover plate 150, which is arranged opposite to the liquid outlet 140.

[0056] The surface of the cover plate 150 is provided with a feeding opening 151 for adding the material liquid 700 into the material liquid tank 130.

[0057] For example, the surface of the cover plate 150 is further provided with a visualization window 152 for observing the liquid level of the material liquid 700 in the material liquid tank 130.

[0058] In some other examples, the flat film production device further comprises a coagulation tank 400, which is arranged below the back roller 200.

[0059] In a specific implementation, the film substrate 500 moves from one side of the back plate 110 of the liquid outlet 140 to one side of the scraper 120 in sequence, and then is coated with the coating liquid 700, and then enters the coagulation tank 400 to perform coagulation.

[0060] It is easy to understand that, based on the several embodiments provided in the present application, the skilled in the art can combine, split, recombine, etc. to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

[0061] The above specific implementation further details the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific implementation of the embodiments of the present application, and is not used to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A novel adjustable length and width coating unit characterized in that, The application relates to a material liquid containing mechanism, a back roller and an adjusting mechanism. The material liquid containing mechanism comprises oppositely arranged back plates and scrapers, the back plates and the scrapers are formed with material liquid grooves for containing material liquid, the bottom of the material liquid grooves is provided with liquid outlets, and the scrapers are configured to scrape the material liquid on the surface of a film base material. The back roller is arranged at the bottom of the liquid outlet, the film base material is attached to the back roller and moves along one side of the back plate to the side of the scraper, and the film base material is completely covered on the liquid outlet along the longitudinal direction of the scraper. The adjusting mechanism is rotationally arranged at one end of the back plate away from the liquid outlet, and a coiled material is wound on the adjusting mechanism, the coiled material is wound on the surface of the film base material on the surface of the back roller through the outer wall of the back plate and below the back plate in sequence, and the coiled material covers the film base material at the liquid outlet along the longitudinal direction of the scraper, so that the material liquid flows to the film base material between the moving end of the coiled material and the scraper.

2. A novel adjustable length and width coating unit as claimed in claim 1, wherein, The adjusting mechanism comprises a rotating shaft and a buckle, and the rotating shaft is rotationally arranged at one end of the back plate away from the liquid outlet. The coiled material is sleeved on the rotating shaft, and the buckle is arranged at both ends of the coiled material to fix the coiled material on the rotating shaft.

3. A novel adjustable length and width coating unit as claimed in claim 1 or 2, wherein, The coiled material is a flexible plastic film, and the coiled material is made of any one of PP or PET.

4. A novel adjustable length and width coating unit as claimed in claim 1 or 2, wherein, The adjusting mechanism further comprises a cutting assembly, the cutting assembly comprises a track and a blade, the track is arranged along the back plate, and the blade is slidingly arranged along the track for cutting the coiled material.

5. A novel adjustable length and width coating unit as claimed in claim 1 or 2, wherein, The material liquid containing mechanism further comprises a cover plate, the cover plate and the liquid outlet are oppositely arranged, and the surface of the cover plate is provided with a feeding opening for feeding material liquid into the material liquid groove.

6. A novel adjustable length and width coating unit as claimed in claim 5, wherein, The surface of the cover plate is further provided with a visual window for observing the liquid level of the material liquid in the material liquid groove.

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