High-efficiency defoaming doctor blade coating mold

Abstract

The utility model discloses a kind of efficient bubble removal doctor blade coating mould, comprising: fixed parts, detachably mounted with doctor blade coating parts in fixed parts top, detachably mounted with liquid storage parts in fixed parts bottom;Fixed parts inside is provided with accommodating groove, doctor blade coating parts inside is provided with first doctor blade coating cavity, liquid storage parts inside is provided with second doctor blade coating cavity, first liquid inlet groove is provided in fixed parts side, second liquid inlet groove is provided in liquid storage parts side.The utility model, first doctor blade coating cavity and second doctor blade coating cavity are communicated to form the doctor blade coating channel that gradually reduces in two-way, so that mandrel and solution can be transported along the doctor blade coating path of doctor blade coating channel, and then effectively remove the air bubble of braided layer residue by extrusion;First liquid inlet groove and second liquid inlet groove are communicated to form lengthened liquid inlet channel, so that solution can be automatically injected by liquid adding equipment and transported along the liquid inlet path of rear liquid inlet channel, further increase bubble removal effect;Doctor blade coating parts are convenient for rapid disassembly and replacement to adapt the manufacturing requirement of different outer diameter product.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a high-efficiency defoaming coating mold. Background Technology

[0002] As an important medical consumable, thin-walled tubes are widely used in minimally invasive surgical instruments, implantable devices, and diagnostic instruments. Polyimide (PI) tubes have attracted widespread attention due to their superior flexibility, supportability, and biocompatibility. However, thin-walled tubes made solely of polyimide (PI) have limitations in mechanical properties. Forming a reinforcing layer through braiding or spring winding can effectively improve these mechanical properties, enabling PI tubes to be used in more complex interventional procedures. Among these methods, the coating method is a precision technique for preparing high-performance films or thin tubes, particularly suitable for applications with strict dimensional requirements. The core principle of the coating method differs from the impregnation method. In preparing thin-walled tubes using this method, a precision-machined mandrel is passed at a constant speed through a mold filled with a high-viscosity solution and featuring precise slits. The gap in the slits determines the thickness of the wet film coated on the mandrel. Subsequently, the mandrel with the wet film coating undergoes gelation, high-temperature imidization, and cooling to obtain the PI tube. The PI tube is then peeled off from the mandrel to obtain the final product.

[0003] When preparing PI tubes using the mandrel coating method, the mandrel has a significant impact on the quality of the final product. The smoothness and straightness of the mandrel directly affect the appearance and performance of the product. Therefore, cleaning the mandrel can meet production requirements when preparing pure PI tubes. However, this method has significant limitations for mandrels with reinforcing layers. Because the reinforcing layer on the surface of the mandrel has many gaps after being braided or spring-wound, the existing coating molds cannot completely fill the gaps with polyamic acid (PAA) solution. This results in reinforced PI tubes with a large number of air bubbles, making it difficult to meet production requirements. Utility Model Content

[0004] The purpose of this utility model is to provide a high-efficiency defoaming coating mold in order to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution, including: A fixed part is detachably mounted on a workbench. A scraping part is detachably mounted on the top of the fixed part, and a liquid storage part is detachably mounted on the bottom of the fixed part. The fixed part has a receiving groove inside, the bottom of the scraping part and the top of the liquid storage part are installed in the receiving groove, the scraping part has a first scraping cavity inside, the liquid storage part has a second scraping cavity inside, the first scraping cavity and the second scraping cavity are connected to form a scraping channel, so that the mandrel and the solution have a scraping path for being transported along the scraping channel. The fixed part has a first liquid inlet groove on its side, and the liquid storage part has a second liquid inlet groove on its side. The first liquid inlet groove and the second liquid inlet groove are connected to form a liquid inlet channel, so that the solution has a liquid inlet path along the liquid inlet channel.

[0006] As a further description of the above technical solution, the top of the fixing part is symmetrically provided with a first threaded hole, the edge of the scraping part is symmetrically provided with a first fixing hole, and the scraping part is detachably connected to the fixing part through a connector.

[0007] As a further description of the above technical solution, the bottom of the fixing part is symmetrically provided with a second threaded hole, the edge of the liquid storage part is symmetrically provided with a second fixing hole, and the liquid storage part is detachably connected to the fixing part through a connector.

[0008] As a further description of the above technical solution, the first coating cavity is funnel-shaped, and the diameter of the first coating cavity gradually increases near the liquid storage component.

[0009] As a further description of the above technical solution, a first through groove is provided at the top of the first coating chamber, and the first through groove is used to pass through the mandrel after coating.

[0010] As a further description of the above technical solution, the first through groove is coaxially arranged with the first scraping cavity, and the aperture of the first through groove is less than or equal to the aperture of the first scraping cavity.

[0011] As a further description of the above technical solution, the second coating cavity is funnel-shaped, and the diameter of the second coating cavity gradually decreases as it approaches the coating part.

[0012] As a further description of the above technical solution, a docking groove is provided at the top of the second coating chamber, and a second through groove is provided at the bottom of the second coating chamber. The second through groove is used to pass through the mandrel to be coated.

[0013] As a further description of the above technical solution, the diameter of the second through groove is greater than or equal to the diameter of the second scraping cavity, and the second through groove and the second scraping cavity are coaxially arranged.

[0014] As a further description of the above technical solution, the aperture of the second liquid inlet tank is smaller than that of the first liquid inlet tank, and the second liquid inlet tank and the first liquid inlet tank are coaxially arranged.

[0015] The beneficial effects of this utility model are as follows: 1. In this utility model, a first scraping cavity is provided inside the scraping part, and a second scraping cavity is provided inside the liquid storage part. The first scraping cavity and the second scraping cavity are connected to form a bidirectional scraping channel that gradually narrows. This can effectively increase the pressure of the solution in the channel, so that the mandrel and the solution can be transported along the scraping path of the scraping channel, making the mandrel and the solution fit more closely, and then effectively removing the air bubbles remaining in the braided layer through extrusion. 2. In this utility model, a first liquid inlet groove is provided on the side of the fixed part, and a second liquid inlet groove is provided on the side of the liquid storage part. The first liquid inlet groove and the second liquid inlet groove are connected to form an extended liquid inlet channel, so that the solution can be automatically injected by the liquid adding equipment and transported along the liquid inlet path of the liquid inlet channel, further increasing the defoaming effect, ensuring stable production process, and high product dimensional stability. 3. In this utility model, the scraping part can be detachably installed on the top of the fixed part, which facilitates quick disassembly and replacement to adapt to the manufacturing needs of products with different outer diameters.

[0016] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the high-efficiency defoaming coating mold of this utility model; Figure 2 This is the front view of the high-efficiency defoaming coating mold of this utility model; Figure 3 This is a cross-sectional view of the high-efficiency defoaming coating mold of this utility model; Figure 4 yes Figure 1 Schematic diagram of the structure of the fixed part Figure 1 ; Figure 5 yes Figure 1 Schematic diagram of the structure of the fixed part Figure 2 ; Figure 6 yes Figure 1 Top view of the fixed part in the middle; Figure 7 yes Figure 6 Sectional view at point BB; Figure 8 yes Figure 1 Schematic diagram of the structure of the part coated by scraping; Figure 9 yes Figure 1 Top view of the part coated with a scraper; Figure 10 yes Figure 9 Sectional view at point AA; Figure 11 yes Figure 1 Schematic diagram of the structure of the liquid storage component; Figure 12 yes Figure 1 Top view of the liquid storage component; Figure 13 yes Figure 12 Sectional view at point CC.

[0018] Figure label: 1. Fixing component; 11. Receiving tank; 12. First liquid inlet tank; 13. First threaded hole; 14. Second threaded hole; 2. Scraping component; 21. First scraping cavity; 22. First fixing hole; 23. First through groove; 3. Liquid storage component; 31. Second scraping cavity; 32. Second liquid inlet tank; 33. Second fixing hole; 34. Second through groove; 35. Connecting groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] like Figures 1-13 As shown, in one embodiment, a high-efficiency defoaming coating mold includes: a fixing part 1, a coating part 2, and a liquid storage part 3; wherein, the fixing part 1 is detachably installed on the workbench, which facilitates the positioning and adjustment of the mold on the production line; the coating part 2 is detachably installed on the top of the fixing part 1, and the liquid storage part 3 is detachably installed on the bottom of the fixing part 1. Through the modular and detachable design, quick disassembly and maintenance can be achieved.

[0021] For example, the fixed part 1 has symmetrical through holes along its edge. In use, it can be tightened and fixed by passing through the through holes and threading the threaded holes on the horizontal platform surface with connecting parts such as hexagon socket bolts of the same specification.

[0022] Furthermore, the top of the fixing part 1 is symmetrically provided with a first threaded hole 13 along the central axis, and the outer edge of the scraping part 2 is provided with a first fixing hole 22 corresponding to the position of the first threaded hole 13, so that the scraping part 2 can be detachably connected to the fixing part 1 by bolts or other connecting parts, ensuring that the scraping part 2 and the fixing part 1 fit tightly together.

[0023] Furthermore, the bottom of the fixing part 1 is symmetrically provided with a second threaded hole 14 along the central axis, and the outer edge of the liquid storage part 3 is provided with a second fixing hole 33 corresponding to the position of the second threaded hole 14, so that the liquid storage part 3 can be detachably connected to the fixing part 1 by bolts or other connecting parts, ensuring that the liquid storage part 3 and the fixing part 1 fit tightly together.

[0024] It is understandable that different specifications of PI tubes require different sizes of scraping channels. The scraping part 2 can be detachably installed on the top of the fixed part 1. By replacing the scraping part 2, it can be easily and quickly disassembled and replaced to adapt to the production needs of products with different outer diameters. Moreover, as a consumable part, the scraping part 2 will wear down the channel due to long-term scraping. The detachable design also makes it easy to replace it individually, thereby effectively reducing the mold maintenance cost.

[0025] The fixed part 1 has a cylindrical receiving groove 11 inside, and the bottom of the scraping part 2 and the top of the liquid storage part 3 are installed in the receiving groove 11 to avoid the scraping channel being interrupted due to the step of the mating surface, and to ensure smooth mandrel conveying and uniform coating thickness.

[0026] For example, the coating part 2 has a first coating cavity 21 inside, while the liquid storage part 3 has a corresponding second coating cavity 31 inside. The first coating cavity 21 and the second coating cavity 31 are connected to form a coating channel, so that the mandrel and the solution have a coating path for being transported along the coating channel. It should be explained in detail that the first coating chamber 21 is funnel-shaped, and the diameter of the first coating chamber 21 gradually increases as it approaches the liquid storage component 3; correspondingly, the second coating chamber 31 is funnel-shaped, and the diameter of the second coating chamber 31 gradually decreases as it approaches the coating component 2.

[0027] It is understandable that the first coating chamber 21 and the second coating chamber 31 are connected to form a bidirectional gradually narrowing coating channel, which can effectively increase the pressure of the solution in the channel, so that the mandrel and the solution can be transported along the coating path of the coating channel, so that the mandrel and the solution can fully adhere to each other, and then effectively remove the air bubbles remaining in the braided layer through extrusion. Furthermore, the top of the first coating chamber 21 is provided with a first through groove 23, which is used to pass through the mandrel after coating. By controlling the aperture of the first through groove 23, PI tubes with different outer diameters can be prepared. Correspondingly, the top of the second coating chamber 31 is provided with a docking groove 35, and the bottom of the second coating chamber 31 is provided with a second through groove 34, which is used to pass through the mandrel to be coated.

[0028] Specifically, the first through groove 23 is coaxially arranged with the first scraping cavity 21, and the diameter of the first through groove 23 is less than or equal to the diameter of the first scraping cavity 21; correspondingly, the diameter of the second through groove 34 is greater than or equal to the diameter of the second scraping cavity 31, and the second through groove 34 is coaxially arranged with the second scraping cavity 31.

[0029] Please continue reading. Figures 1-13 In this embodiment, a first liquid inlet groove 12 is provided on the side of the fixed part 1, and a second liquid inlet groove 32 is provided on the side of the liquid storage part 3. The first liquid inlet groove 12 and the second liquid inlet groove 32 are connected to form a liquid inlet channel, so that the solution has a liquid inlet path for being transported along the liquid inlet channel.

[0030] Specifically, the aperture of the second liquid inlet 32 ​​is smaller than that of the first liquid inlet 12. The second liquid inlet 32 ​​and the first liquid inlet 12 are coaxially arranged, which can stabilize the solution flow rate while avoiding the introduction of air, so that the solution is gradually pressurized and transported into the second scraping cavity 31 inside the liquid storage part 3.

[0031] Understandably, the first liquid inlet tank 12 and the second liquid inlet tank 32 are connected to form an extended liquid inlet channel, which allows the solution to be automatically injected by the liquid adding equipment and transported along the liquid inlet path of the liquid inlet channel, further increasing the defoaming effect, ensuring stable production process and high product dimensional stability.

[0032] Working principle: First, PAA solution is injected into the inlet channel formed by the first inlet tank 12 of the fixed part 1 and the second inlet tank 32 of the storage part 3 through an automatic liquid dispensing device, so that the solution continuously fills the second scraping cavity 31 of the storage part 3. Then, the mandrel to be processed, with a braided layer on its surface, enters from the second through groove 34 at the bottom of the storage part 3 at a constant linear velocity and is conveyed upward along the coaxial scraping channel. Because the scraping channel is formed by the connection between the second scraping cavity 31, which is wider at the bottom and narrower at the top, and the first scraping cavity 21, which is narrower at the top and wider at the bottom, a bidirectional scraping channel that gradually narrows. During the movement of the mandrel, the solution pressure in the channel continuously increases, forcing the PAA solution to fully penetrate and fill the tiny gaps in the braided layer, while squeezing out the residual air in the gaps, thus solving the bubble problem at its source. Finally, the PAA solution after pressure extrusion forms a uniform wet film on the surface of the mandrel, and the thickness of the wet film is precisely limited by the aperture of the first through groove 23 at the top of the first coating chamber 21. The mandrel, carrying a bubble-free uniform coating, passes through the first through groove 23 and enters the processing station, ultimately achieving the bubble-free preparation of the braided reinforced PI tube.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-efficiency defoaming coating mold, characterized in that, include: A fixed part (1) is detachably installed on the workbench. A scraping part (2) is detachably installed on the top of the fixed part (1), and a liquid storage part (3) is detachably installed on the bottom of the fixed part (1). The fixed part (1) has a receiving groove (11) inside. The bottom of the scraping part (2) and the top of the liquid storage part (3) are installed in the receiving groove (11). The scraping part (2) has a first scraping cavity (21) inside. The liquid storage part (3) has a second scraping cavity (31) inside. The first scraping cavity (21) and the second scraping cavity (31) are connected to form a scraping channel, so that the mandrel and the solution have a scraping path for conveying along the scraping channel. The fixed part (1) has a first liquid inlet groove (12) on its side, and the liquid storage part (3) has a second liquid inlet groove (32) on its side. The first liquid inlet groove (12) and the second liquid inlet groove (32) are connected to form a liquid inlet channel, so that the solution has a liquid inlet path that is transported along the liquid inlet channel.

2. The high-efficiency defoaming coating mold according to claim 1, characterized in that, The top of the fixing part (1) is symmetrically provided with a first threaded hole (13), and the edge of the scraping part (2) is symmetrically provided with a first fixing hole (22). The scraping part (2) is detachably connected to the fixing part (1) through a connector.

3. The high-efficiency defoaming coating mold according to claim 1, characterized in that, The bottom of the fixing part (1) is symmetrically provided with a second threaded hole (14), and the edge of the liquid storage part (3) is symmetrically provided with a second fixing hole (33). The liquid storage part (3) is detachably connected to the fixing part (1) through a connector.

4. The high-efficiency defoaming coating mold according to claim 1, characterized in that, The first coating cavity (21) is funnel-shaped, and the diameter of the first coating cavity (21) gradually increases as it approaches the liquid storage component (3).

5. The high-efficiency defoaming coating mold according to claim 4, characterized in that, The top of the first scraping cavity (21) is provided with a first through groove (23), which is used to pass through the mandrel after scraping.

6. The high-efficiency defoaming coating mold according to claim 5, characterized in that, The first through groove (23) is coaxially arranged with the first scraping cavity (21), and the diameter of the first through groove (23) is less than or equal to the diameter of the first scraping cavity (21).

7. The high-efficiency defoaming coating mold according to claim 1, characterized in that, The second coating cavity (31) is funnel-shaped, and the diameter of the second coating cavity (31) gradually decreases as it approaches the coating part (2).

8. The high-efficiency defoaming coating mold according to claim 7, characterized in that, The second scraping cavity (31) has a docking groove (35) at the top and a second through groove (34) at the bottom. The second through groove (34) is used to pass through the mandrel to be scraped.

9. The high-efficiency defoaming coating mold according to claim 8, characterized in that, The diameter of the second through groove (34) is greater than or equal to the diameter of the second scraping cavity (31), and the second through groove (34) and the second scraping cavity (31) are coaxially arranged.

10. The high-efficiency defoaming coating mold according to claim 1, characterized in that, The aperture of the second liquid inlet (32) is smaller than that of the first liquid inlet (12), and the second liquid inlet (32) and the first liquid inlet (12) are coaxially arranged.

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