Nitrocellulose membrane coating and forming device
By using a reverse roll coating process and a multi-stage constant temperature chamber design for nitrocellulose film coating and forming equipment, the problems of uneven coating thickness and unstable forming were solved, achieving uniform coating thickness and forming stability, and improving the quality consistency of the film.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANREN MEMBRANE TECH (SHAOXING) CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-19
AI Technical Summary
In the production of nitrocellulose membranes, existing technologies struggle to achieve uniform coating thickness and stable molding, especially during long-distance transport, which can easily lead to uneven coating.
The reverse roll coating process and multi-stage constant temperature chamber design are adopted. Combined with the leveling conveyor and pressure roller structure, the nitrocellulose membrane solution is coated onto the PE film through reverse roll coating and stabilized in multiple constant temperature chambers. The uniformity of film thickness is ensured by using stepped temperature and the clamping effect of the pressure rollers.
This method achieves uniform coating thickness and stable forming of nitrocellulose membranes, avoiding uneven coating caused by long-distance transportation and ensuring consistent membrane quality.
Smart Images
Figure CN224253346U_ABST
Abstract
Description
Technical Field
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[0001] The utility model belongs to the technical field of coating forming, and particularly relates to a coating forming device for a nitrocellulose membrane. Background Art
[0002] The nitrocellulose membrane (NC membrane) is a material widely used in biomedicine and laboratory testing. It has characteristics such as high protein binding capacity, high mechanical strength, good capillary rate, and thickness consistency. The nitrocellulose membrane is used in a variety of detection methods, including colloidal gold test strips, Western blotting, and immunoassay tests.
[0003] In the production process of the nitrocellulose membrane, specifically in the coating forming process, the NC membrane slurry solution is injected onto the PE membrane, and the NC membrane slurry solution needs to be sequentially transported through a constant temperature chamber with a stepped temperature along with the PE membrane for operation. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a coating forming device for a nitrocellulose membrane.
[0005] The utility model is realized through the following technical solutions:
[0006] The utility model is a coating forming device for a nitrocellulose membrane, which includes a flat conveyor and at least three sequentially connected constant temperature chambers. The middle constant temperature chamber is the third constant temperature chamber. There is a conveying platform in the constant temperature chamber, and two rows of driven wheels are arranged on the conveying platform. There are two deflection guide rollers in the third constant temperature chamber, and the driven wheels are stepped wheels;
[0007] The flat conveyor includes a pressure roller. The pressure roller includes a central shaft, and a pressure wheel and a driving wheel are arranged at both ends of the central shaft. The driving wheel is adjacent to the end face of the central shaft;
[0008] The conveying platform conveys the PE membrane coated with the nitrocellulose membrane coating material, and the pressure wheel and the driving wheel press the PE membrane onto the driven wheels.
[0009] Further, the constant temperature chamber includes a first constant temperature chamber, a second constant temperature chamber, a third constant temperature chamber, a fourth constant temperature chamber, and a fifth constant temperature chamber that are sequentially connected.
[0010] Further, the flat conveyor includes a "J" - shaped plate. Holes are opened on both side plates of the "J" - shaped plate, bearings are installed in the holes, and both ends of the central shaft are fitted into the bearings. An installation plate is provided at the end of the "J" - shaped plate, and a driver is installed under the installation plate.
[0011] Further, chain - belt holes are opened on the installation plate. The driver includes a motor, and the motor and the end of the central shaft are connected by a chain - belt.
[0012] Furthermore, it also includes a reverse roller coating unit, which includes a lifting roller, a coating roller, and a texture-removing roller. The lifting roller, coating roller, and texture-removing roller are all mounted on the conveyor table via roller frames, with the coating roller and the conveyor table abutting against each other.
[0013] Furthermore, the conveyor table is equipped with a feeding roller and a guide roller, and a PE film is wound on the feeding roller.
[0014] This utility model has the following beneficial effects:
[0015] This invention uses a reverse roller coating process to coat a nitrocellulose membrane slurry solution onto a PE membrane. The coating thickness is between 0.1 and 0.2 mm. After coating, the PE membrane with the nitrocellulose membrane slurry solution is formed in a constant temperature chamber. The PE membrane is driven at a constant speed by a leveling conveyor 12 in the constant temperature chamber to avoid uneven coating thickness caused by stretching the PE membrane during long-distance transport.
[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the coating and forming device.
[0019] Figure 2 This is a schematic diagram of the leveling conveyor.
[0020] Figure 3 This is a structural diagram of the pressure roller, driver, and conveyor platform.
[0021] The attached diagram lists the components represented by each number as follows:
[0022] 1. Feeding roller; 2. Guide roller; 3. Conveyor table; 4. Lifting roller; 5. Coating roller; 6. Texture-removing roller; 7. First constant temperature chamber; 8. Second constant temperature chamber; 9. Third constant temperature chamber; 10. Fifth constant temperature chamber; 11. Fourth constant temperature chamber; 12. Leveling conveyor; 13. Pressure roller; 14. Driver; 15. Conveying platform; 16. Deflecting guide roller; 1301. Pressure roller; 1302. Drive wheel; 1303. Central shaft; 1401. Chain belt; 1501. Driven wheel. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0025] Please see Figure 1-3 As shown, this utility model is a nitrocellulose membrane coating and forming device. It uses a reverse roller coating process to coat a nitrocellulose membrane slurry solution onto a PE membrane. The coating thickness is between 0.1 and 0.2 mm. After coating, the PE membrane with the nitrocellulose membrane slurry solution is formed in a constant temperature chamber. Figure 1 As shown, the constant temperature chamber consists of five interconnected chambers, with the temperature stability of each chamber increasing in a stepped manner: 20℃, 22℃, 26℃, 32℃, and 36℃, and the air humidity is 50%.
[0026] Specifically, the constant temperature chamber includes a first constant temperature chamber 7, a second constant temperature chamber 8, a third constant temperature chamber 9, a fourth constant temperature chamber 11, and a fifth constant temperature chamber 10 connected in sequence. The length of each first constant temperature chamber 7 is set at 15m. In order to reduce the space in the field, the PE film with nitrocellulose membrane is rotated and guided for transportation. That is, the third constant temperature chamber 9, which is in the middle, is a rotating chamber and is concave in shape. The first constant temperature chamber 7 and the second constant temperature chamber 8 are located above the fourth constant temperature chamber 11 and the fifth constant temperature chamber 10 and are fixed by support columns.
[0027] The PE film runs at a constant speed, with the stainless steel belt running at 8.83 meters per hour. Since the constant temperature room is quite long and the PE film is thin, the PE film is driven by the leveling conveyor 12. The specific driving method is a side-driven PE film. When the completed nitrocellulose film is cut, the excess material on both sides is removed.
[0028] Specifically, the constant temperature chamber has a conveyor platform 15, on which two rows of driven wheels 1501 are installed. The third constant temperature chamber 9 has two deflecting guide rollers 16 installed on it. The driven wheels 1501 are stepped wheels.
[0029] The leveling conveyor 12 includes a pressure roller 13, which includes a central shaft 1303. The two ends of the central shaft 1303 are provided with pressure rollers 1301 and drive rollers 1302. The drive rollers 1302 are close to the end face of the central shaft 1303. The pressure rollers 1301, driven rollers 1501 and drive rollers 1302 are all EPDM rubber wheels with diamond or herringbone patterned rubber coating to increase friction. In addition, the use of stepped rollers and the reduction of PE film deviation are also included. The clamping pressure is recommended to be between 0.1-0.3 MPa.
[0030] The conveying platform 15 conveys a PE film coated with nitrocellulose film coating, and the pressure roller 1301 and drive roller 1302 press the PE film onto the driven roller 1501.
[0031] Furthermore, the leveling conveyor 12 includes a "U"-shaped plate with holes on both sides of the "U"-shaped plate, bearings installed in the holes, and the two ends of the central shaft 1303 fitting in the bearings. The end of the "U"-shaped plate has a mounting plate, and a driver 14 is installed under the mounting plate.
[0032] Furthermore, the mounting plate has a chain belt hole, and the driver 14 includes a motor. The motor and the end of the central shaft 1303 are connected by a chain belt 1401. Specifically, gears are provided on both the motor shaft and the central shaft 1303, and the motor speeds in the motor constant temperature chamber are the same.
[0033] Furthermore, it also includes a reverse roller coating assembly, which includes a lifting roller 4, a coating roller 5, and a texture-removing roller 6. The lifting roller 4, coating roller 5, and texture-removing roller 6 are all mounted on the conveyor table 3 via roller frames. The coating roller 5 and the conveyor table 3 are in contact with each other. The coating roller 5 is made of fluororubber.
[0034] Furthermore, the conveyor 3 is equipped with a feeding roller 1 and a guide roller 2. PE film is wound on the feeding roller 1. The lifting roller 4, coating roller 5 and feeding roller 1 are driven independently.
[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A nitrocellulose membrane coating and forming apparatus, characterized in that, It further includes: At least three sequentially connected constant temperature chambers. The middle constant temperature chamber is the third constant temperature chamber (9). A conveying platform (15) is provided in the constant temperature chamber. Two rows of driven wheels (1501) are provided on the conveying platform (15). Two deflection guide rollers (16) are provided in the third constant temperature chamber (9). The driven wheels (1501) are stepped wheels. It further includes a flattening conveyor (12). The flattening conveyor (12) includes a pressure roller (13). The pressure roller (13) includes a central shaft (1303). A pressure wheel (1301) and a driving wheel (1302) are provided at both ends of the central shaft (1303). The driving wheel (1302) is adjacent to the end face of the central shaft (1303). The conveying platform (15) conveys a PE film coated with nitrocellulose film coating. The pressure wheel (1301) and the driving wheel (1302) press the PE film onto the driven wheels (1501).
2. The nitrocellulose membrane coating and forming apparatus according to claim 1, characterized in that, The constant temperature chambers include a first constant temperature chamber (7), a second constant temperature chamber (8), a third constant temperature chamber (9), a fourth constant temperature chamber (11), and a fifth constant temperature chamber (10) that are sequentially connected.
3. The nitrocellulose membrane coating and forming apparatus according to claim 1, characterized in that, The flattening conveyor (12) includes a "C"-shaped plate. Holes are opened on both side plates of the "C"-shaped plate. Bearings are installed in the holes. Both ends of the central shaft (1303) are fitted in the bearings. An installation plate is provided at the end of the "C"-shaped plate. A driver (14) is installed under the installation plate.
4. The nitrocellulose membrane coating and forming apparatus according to claim 3, characterized in that, A chain belt hole is opened on the installation plate. The driver (14) includes a motor. The motor and the end of the central shaft (1303) are connected by a chain belt (1401).
5. A nitrocellulose film coating and forming apparatus according to any one of claims 1-4, characterized in that, It further includes a reverse roller coating group. The reverse roller coating group includes a material lifting roller (4), a coating roller (5), and a pattern eliminating roller (6). The material lifting roller (4), the coating roller (5), and the pattern eliminating roller (6) are all installed on a conveying table (3) through roller brackets. The coating roller (5) abuts against the conveying table (3).
6. The nitrocellulose film coating and forming apparatus according to claim 5, characterized in that, A material feeding roller (1) and a guide roller (2) are installed on the conveying table (3). A PE film is wound around the material feeding roller (1).