A coating apparatus for producing bandages

Abstract

This utility model relates to a coating device for producing adhesive bandages, including a storage tank. The top and bottom of the storage tank are respectively provided with an inlet and an outlet. The bottom of the outlet is connected to a spray tube, and the bottom of the spray tube is provided with a coating cover plate. Injection parts are respectively provided at both ends of the coating cover plate. Both injection parts are connected to the spray tube. A conveyor belt is arranged below the storage tank. The surface of the conveyor belt is provided with a coating mold base. The coating cover plate is tightly fastened to the coating mold base. This application adopts a combination design of a spray plate with dual injection parts and rectangular array spray holes to replace the conventional injection part glue injection process. The reserved gap between the spray plate and the coating cover plate can form a stable air pressure field. With the precise control of the pneumatic spray valve, the glue is evenly distributed throughout the entire area through the array spray holes, effectively solving the problem of local accumulation or sparseness in traditional single injection part coating, ensuring the consistency of adhesive force of the adhesive bandage, and significantly reducing the positioning deviation rate of the coating area.

Description

Technical Field

[0001] This utility model relates to the technical field of bandage production equipment, specifically to a coating device for bandage production. Background Technology

[0002] As an indispensable portable medical product in daily life and medical scenarios, the quality of adhesive bandages directly affects the wound protection and healing effect. The coating process, as a core production step, plays a decisive role in the reliability of product adhesion, user comfort, and quality stability. Current wound dressing coating production technology faces multiple technical bottlenecks: In terms of coating uniformity, traditional coating devices often use single injection components or simple spray structures, which can easily lead to local accumulation or sparse distribution of adhesive, resulting in overflow and contamination at the edges of the wound dressing or insufficient adhesion in the middle, seriously affecting the user experience; In terms of positioning accuracy, the conveyor belt has weak constraint on the wound dressing, and it is easy to cause displacement due to conveyor vibration or speed fluctuations, resulting in deviation between the coating area and the preset position, and a high defect rate. The adhesive management system also has significant shortcomings: during storage, long-term static storage of the adhesive can easily lead to component stratification and solidification, and traditional stirring structures cannot achieve uniform mixing throughout the entire process; temperature stability lacks effective control, and the viscosity of the adhesive fluctuates significantly with ambient temperature, directly resulting in uneven coating thickness. In addition, the control of the amount of adhesive applied relies on manual experience or simple valve adjustment, which cannot achieve precise digital measurement, resulting in adhesive waste and making it difficult to ensure the consistency of adhesive application for different sizes of bandages. To address the aforementioned pain points, the industry urgently needs an integrated device that combines precise coating, stable positioning, and intelligent adhesive management to overcome the technical limitations of traditional production models and improve the production quality and efficiency of bandages. Utility Model Content

[0003] Based on the above description, this utility model provides a coating device for the production of wound dressings, which solves the shortcomings of existing wound dressing coating production equipment, such as uneven distribution of adhesive during the coating process, inability to achieve accurate measurement, easy waste, and difficulty in ensuring coating consistency.

[0004] This utility model is achieved through the following technical solution: A coating device for producing adhesive bandages includes a storage tank. The storage tank has an inlet and an outlet at its top and bottom, respectively. A spray pipe is connected to the bottom of the outlet. An adhesive cover plate is provided at the bottom of the spray pipe. Injection parts are provided at both ends of the adhesive cover plate. Both injection parts are connected to the spray pipe. A conveyor belt is arranged below the storage tank. An adhesive coating mold base is provided on the surface of the conveyor belt. A mounting bracket is provided on the top of the adhesive cover plate. A cylinder is provided on the top of the mounting bracket. The output end of the cylinder extends downward and is fixedly connected to the top of the adhesive cover plate. The output end of the cylinder extends vertically downward and tightly engages the adhesive cover plate with the adhesive coating mold base.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the bottom surface of the adhesive cover plate is provided with mounting grooves at both ends, and a spraying plate is embedded in the mounting groove. The surface of the spraying plate is spaced from the surface of the adhesive cover plate. The spraying plate is hollow inside and has spray holes arranged in a rectangular array on the bottom surface. The top of the spraying plate is provided with an interface that communicates with the output end at the bottom of the injection part.

[0007] Furthermore, the injection component is configured as a pneumatic injection valve, and one side of the injection component is also equipped with an air supply pipe, the other end of which extends outward and is connected to an external air pump.

[0008] Furthermore, a solenoid valve and an adhesive meter are provided at the connection between the spray tube and the injection part, wherein the adhesive meter is also provided with a display screen.

[0009] Furthermore, the conveyor belt is equipped with a negative pressure box, which is connected to a vacuum pump. The top surface of the adhesive coating mold base is also provided with several adsorption holes at both ends. The adsorption holes are all connected to the negative pressure box through the internal air passage of the conveyor belt. In addition, a band-aid is placed horizontally inside the adhesive coating mold base and completely covers the adsorption holes.

[0010] Furthermore, the storage tank is equipped with a stirring shaft inside, a stirring motor is provided at the top of the storage tank, the top end of the stirring shaft extends to the top of the storage tank and is connected to the stirring motor for transmission, and stirring blades are provided on the outer wall of the lower half of the stirring shaft.

[0011] Furthermore, the stirring shaft is hollow inside and contains a built-in heating element, which is electrically connected to an external power source via a wire.

[0012] Furthermore, a temperature sensor is also installed inside the storage tank, and the display screen of the temperature sensor is fixedly installed on the surface of the storage tank.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This application improves upon existing wound dressing coating production equipment by adopting a combination design of a dual-injection plate and a rectangular array of spray nozzles to replace the conventional injection process. The pre-reserved gap between the spray plate and the coating cover plate can form a stable air pressure field. Combined with the precise control of the pneumatic jet valve, the adhesive is evenly distributed throughout the entire area through the array of spray nozzles, effectively solving the problem of local accumulation or sparseness in traditional single-injection coating and ensuring the consistency of the adhesive force of the wound dressing. At the same time, during the injection process, the coating cover plate can be tightly engaged with the coating mold by a cylinder. Combined with the synergistic effect of the negative pressure box inside the conveyor belt and the adsorption holes of the coating mold, displacement caused by vibration or speed fluctuations during the conveying process is completely avoided, and the positioning deviation rate of the coating area is significantly reduced. 2. This application also equips the connection between the spray tube and the injection part with a solenoid valve and a glue meter, which can monitor and accurately control the glue output in real time. The display screen presents the data intuitively, realizing digital management of the glue application amount and reducing glue waste. At the same time, the stirring shaft and stirring blades in the storage tank can stir the entire area, and with the electric heating tube and temperature sensor built into the hollow stirring shaft, the temperature and uniformity of the glue can be dynamically adjusted to prevent component stratification and solidification, and ensure the stability of the glue viscosity. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the storage tank and conveyor belt in this embodiment; Figure 2 This is a schematic diagram of the structure of the storage tank, the glue spraying tube, and the glue application cover in this embodiment; Figure 3 This is a schematic diagram of the adhesive coating cover and injection molding parts in this embodiment; Figure 4 This is a schematic diagram of the adhesive spraying plate in this embodiment; The components include: 1. Storage tank; 11. Stirring motor; 12. Stirring shaft; 2. Spraying hose; 21. Injection part; 22. Solenoid valve; 23. Adhesive meter; 24. Gas supply pipe; 3. Conveyor belt; 31. Glue application mold base; 4. Cylinder; 5. Glue application cover plate; 51. Spraying plate. Detailed Implementation

[0015] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0017] Combination Figure 1-4 As shown, a coating apparatus for producing adhesive bandages includes: Storage tank 1 is a metal tank containing hot melt medical pressure-sensitive adhesive for coating. It is used to spray both ends of the bandage during the coating production process, so that it can adhere to human skin during use. The glue spraying tube 2 is located at the bottom of the storage tank 1 and is connected to the inside of the storage tank 1. It is used to transfer and transport the glue liquid. The top and bottom of the tube are respectively provided with an inlet and an outlet. The adhesive cover plate 5 is set at the bottom of the adhesive spray tube 2, and injection parts 21 are provided on both sides of it. The injection parts 21 are connected to the adhesive spray tube 2 and are used to spray adhesive at both ends of the bandage. The conveyor belt 3 is configured with a negative pressure adsorption structure, such as the Yiheda KPF61 negative pressure adsorption conveyor, the Intralox UVFR series vacuum adsorption conveyor belt 3, and other existing conveying equipment. It is equipped with a negative pressure box inside and uses a vacuum pump to form a continuous negative pressure. Simultaneously, an adhesive coating mold 31 is equipped on its surface to help fix the bandage. The bottom surface of the adhesive coating mold 31 is provided with adsorption holes and is connected to the internal negative pressure box through an air channel, so as to continuously adsorb the bottom surface of the bandage placed horizontally inside the adhesive coating mold 31, ensuring that it will not be displaced due to equipment vibration or other factors, and improving the stability of the coating work. The cylinder 4 is mounted on the top of the adhesive application cover plate 5 via a mounting bracket, and its bottom end is fixedly connected to the top surface of the adhesive application cover plate 5. This allows the adhesive application cover plate 5 and the adhesive application mold base 31 to be snapped together, forming a sealed adhesive application space. This can effectively improve the accuracy of the adhesive spraying and also achieve a positioning effect on the bandage through snapping and squeezing.

[0018] Specifically, in this embodiment, the hot-melt pressure-sensitive adhesive inside the storage tank 1 needs to be preheated and stirred before injection to ensure increased fluidity at high temperatures, thus facilitating subsequent spraying. Therefore, a stirring shaft 12 should be vertically installed inside the storage tank 1, with its top end movably connected to the top of the storage tank 1 via a ball bearing. This top end should extend to the outside of the storage tank 1, and its bottom surface should be equipped with spiral stirring blades for rotating and stirring the pressure-sensitive adhesive. A stirring motor 11 is also installed at the top of the storage tank 1. The output end of the stirring motor 11 is connected to the top end of the stirring shaft 12 via a bevel gear meshing structure. For example, [details omitted]. Figure 1 As shown, it should also be equipped with a temperature sensor and display the temperature of the adhesive solution inside.

[0019] Meanwhile, the stirring shaft 12 should be made of stainless steel and equipped with an electric heating tube inside. The top of the electric heating tube is connected to an external circuit through a wire to supply power to the electric heating tube. Furthermore, the electric heating tube can be rotatably connected to the inner wall of the stirring shaft 12 using a ball bearing to ensure that it does not affect the flexible rotation of the stirring shaft 12.

[0020] In addition, a solenoid valve 22 and an adhesive meter 23 should be provided at the connection between the spray tube 2 and the injection unit 21. The solenoid valve 22 is preferably a ZCG series high-temperature solenoid valve 22, and the adhesive meter 23 is preferably a Xiamen Jingchuan JCGF series gear flow meter. The adhesive meter 23 is also equipped with a display screen. The adhesive meter 23 is used to measure the amount of adhesive delivered to the injection unit 21 in a single delivery. The solenoid valve 22 is used to control the opening and closing of the spray tube 2 and the injection unit 21. Both electronic devices should be electrically connected to an external control device via wires, or remotely controlled via a Bluetooth module. Through an external control device (such as a programmable Siemens SIMATIC S7-1500 controller), quantitative delivery is performed through a preset program to ensure that the amount of adhesive discharged into the injection unit 21 is approximately the same each time, so that the amount of adhesive sprayed on each bandage is consistent during the application process. In addition, to improve the efficiency of adhesive injection, an output pump can be additionally equipped on the spray tube 2, such as a gear pump from the Graco Therm-O-Flow series. Specific models can be selected according to requirements, such as Therm-O-Flow 200 (55 gallons), Therm-O-Flow 20 (5 gallons), Therm-O-Flow Mini-5, etc.

[0021] Meanwhile, the injection part 21 is configured as a pneumatic injection valve. One side of the injection part 21 is connected to an air supply pipe 24, which is connected to an external air pump to periodically input high-pressure gas and use the air pressure to drive the internal hot melt adhesive for spraying.

[0022] Furthermore, in actual production, the backing layer of the bandage is mainly made of non-woven fabric. Conventional spraying methods would completely cover the bonding area, thus reducing the breathability of the bandage. Therefore, in this embodiment, a multi-point spraying structure is adopted to spray the surface of the bandage. That is, there are mounting grooves at both ends of the adhesive cover plate 5, and a spraying plate 51 is set inside the mounting groove. The inside of the spraying plate 51 is hollow, and there are several spray holes arranged in a rectangular array at the bottom. The top is provided with an interface and communicates with the injection component 21. When the injection component 21 is injected into the inside of the spraying plate 51 with the assistance of compressed air, the diversion channel inside the spraying plate 51 can be used to make multiple spray holes spray out the same amount of adhesive at the same time, thereby performing multi-point synchronous adhesive spraying on the bonding area of ​​the backing layer of the bandage.

[0023] Compared to traditional overlay spraying, this multi-point spraying method precisely controls the adhesive application to the edge bonding area, preventing it from overflowing into the absorbent layer and contaminating it (avoiding wound irritation or affecting absorption). It also ensures the adhesive is distributed only at the required locations, clearly defining functional zones and guaranteeing safety. Furthermore, medical pressure-sensitive adhesive (used in bandages) is expensive, and bandages don't require full-surface application. Multi-point application applies adhesive only to necessary edge areas, precisely controlling the amount and avoiding material waste from full-surface application. This is particularly suitable for mass production, significantly reducing the cost per unit. Additionally, bandages are small (typically 2-10cm) and need to conform to skin curves (such as fingers and joints). Multi-point application ensures consistent adhesive at each point, resulting in even adhesion around the bandage. This avoids excessive adhesive in some areas, which can pull on the skin when removed (especially for children and those with sensitive skin), or insufficient adhesive in others, which can lead to poor adhesion (such as edges lifting during exercise), thus improving the user experience.

[0024] In this embodiment, multiple adhesive application mold bases 31 on the conveyor belt 3 can be arranged side by side. At the same time, the cylinder 4 and the adhesive application cover plate 5 connected to its bottom can also be appropriately enlarged so that they can fit and cover multiple adhesive application mold bases 31 arranged side by side at one time. Thus, multiple sets of injection parts 21 are used to position the nozzles of multiple wound dressings simultaneously. During this process, the conveyor belt 3 should be assisted by a stepper motor to ensure that the distance of each conveying is such that the adhesive application mold bases 31 arranged side by side are aligned vertically with the adhesive application cover plate 5.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A coating apparatus for producing wound dressings, characterized in that, The storage tank (1) is provided with an inlet and an outlet at the top and bottom of the storage tank (1), respectively. The bottom of the outlet is connected to a glue spraying pipe (2). The bottom of the glue spraying pipe (2) is provided with a glue coating cover plate (5). The two ends of the glue coating cover plate (5) are respectively provided with injection parts (21). The two injection parts (21) are connected to the glue spraying pipe (2). A conveyor belt (3) is also arranged below the storage tank (1). The surface of the conveyor belt (3) is provided with a glue coating mold base (31). The top of the glue coating cover plate (5) is also provided with a mounting bracket. The top of the mounting bracket is provided with a cylinder (4). The output end of the cylinder (4) extends downward and is fixedly connected to the top of the glue coating cover plate (5). The output end of the cylinder (4) extends vertically downward and makes the glue coating cover plate (5) and the glue coating mold base (31) tightly fastened.

2. The coating apparatus for producing wound dressings according to claim 1, characterized in that, The bottom surface of the adhesive cover plate (5) is provided with mounting grooves at both ends. The mounting grooves are embedded with a spray plate (51), and there is a gap between the surface of the spray plate (51) and the surface of the adhesive cover plate (5). The spray plate (51) is hollow inside and has spray holes arranged in a rectangular array on the bottom surface. The top of the spray plate (51) is provided with an interface and is connected to the output end at the bottom of the injection part (21).

3. The coating apparatus for producing wound dressings according to claim 2, characterized in that, The injection component (21) is configured as a pneumatic injection valve, and one side of the injection component (21) is also equipped with an air supply pipe (24), the other end of which extends outward and is connected to an external air pump.

4. The coating apparatus for producing wound dressings according to claim 3, characterized in that, The connection between the spray tube (2) and the injection part (21) is also provided with a solenoid valve (22) and an adhesive meter (23), wherein the adhesive meter (23) is also provided with a display screen on its surface.

5. The coating apparatus for producing wound dressings according to claim 4, characterized in that, The conveyor belt (3) is equipped with a negative pressure box inside, which is connected to a vacuum pump. The top surface of the adhesive coating mold base (31) is also provided with several adsorption holes at both ends. The adsorption holes are connected to the negative pressure box through the internal air passage of the conveyor belt (3). The adhesive coating mold base (31) is horizontally placed inside and completely covers the adsorption holes.

6. The coating apparatus for producing wound dressings according to claim 5, characterized in that, The storage tank (1) is also equipped with a stirring shaft (12), and a stirring motor (11) is provided on the top of the storage tank (1). The top end of the stirring shaft (12) extends to the top of the storage tank (1) and is connected to the stirring motor (11) in a transmission. The outer side wall of the lower half of the stirring shaft (12) is also equipped with stirring blades.

7. The coating apparatus for producing wound dressings according to claim 6, characterized in that, The stirring shaft (12) is hollow inside and has a built-in electric heating tube, which is electrically connected to an external power source through a wire.

8. The coating apparatus for producing wound dressings according to claim 7, characterized in that, The storage tank (1) is also equipped with a temperature sensor, and the display screen of the temperature sensor is fixedly installed on the surface of the storage tank (1).

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