A pressing device for adhesive bandage production

Abstract

The utility model relates to a kind of pressure bar devices for adhesive bandage production, comprising: roller body assembly and inflatable elastic extruding pieceThe roller body assembly includes mounting groove, the inside of the mounting groove is provided with inflatable elastic extruding piece, the inflatable elastic extruding piece extends to the outside of mounting groove, inflatable cavity is formed between the mounting groove and the inflatable elastic extruding piece, the roller shaft of the roller body assembly is provided with the gas path that is connected with the inflatable cavity, the gas path is interconnected with gas source by pipeline, to inflate inflatable cavity, so that inflatable elastic extruding piece occurs elastic deformation;The utility model is provided with roller body assembly and inflatable elastic extruding piece and other components, by the cooperation between roller body assembly and inflatable elastic extruding piece, when gas source carries out inflation operation inside roller body assembly, inflatable elastic extruding piece occurs elastic deformation after inflation, the spacing between elastic deformation inflatable member and extruding roller is reduced, thereby the size of adjusting drug core received pressure is realized.

Description

Technical Field

[0001] This utility model relates to the field of bandage production technology, specifically to a bandage production strip pressing device. Background Technology

[0002] Band-aids are a common type of surgical dressing, mainly composed of a backing, a medical pressure-sensitive adhesive layer, a medicated core, and release paper. The medicated core is bonded to the backing through the medical pressure-sensitive adhesive layer.

[0003] During the production process of the bandage, the backing is cut into thin strips, and medical pressure-sensitive adhesive is applied to the surface of the backing through an adhesive applicator. Then, the medicated core is placed on the surface of the medical pressure-sensitive adhesive. Under the action of the upper and lower extrusion rollers, a pressure is applied to the medicated core and the backing, thereby firmly adhering the medicated core to the backing. Both the upper and lower extrusion rollers are supported by bearing seats, that is, the extrusion rollers are connected to the bearing seats through bearings sleeved on the outside of them. During the bonding process between the drug core and the backing, precise pressure control is required. If the pressure is too low, the bonding will not be strong enough, while if the pressure is too high, it will lead to the loss of the active ingredients of the drug and deformation of the drug core. In order to ensure the quality of the produced products, the distance between the upper and lower extrusion rollers usually needs to be precisely adjusted. To ensure the accuracy and convenience of adjustment, a lead screw and a motor are usually used for adjustment. Although this adjustment method is very mature and convenient, the adjustment distance is also small because the drug core itself is thin and small in volume. It requires high precision, and the lead screw with high precision is expensive. Furthermore, when adjusting the distance between the upper and lower extrusion rollers via a lead screw, the adjustment structure, being a mechanical mechanism, is subject to the influence of the weight of the extrusion rollers and vibrations from other equipment in the production workshop, resulting in a "micro-slippage" phenomenon. This reduces the accuracy of the distance adjustment and affects product quality. Therefore, a pressure strip device for bandage production is proposed to solve the aforementioned problems. Utility Model Content

[0004] Based on the above description, this utility model provides a pressure strip device for the production of wound dressings, in order to solve the problem that the screw structure used to adjust the distance between the upper and lower extrusion rollers is easily affected by external forces and its accuracy is reduced during the use of the wound dressing core adhesive process.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A pressure strip device for producing bandages, comprising: a roller assembly and an inflatable elastic extruder. The roller assembly includes a mounting groove, inside which an inflatable elastic extruder is disposed. The inflatable elastic extruder extends to the outside of the mounting groove, and an inflation cavity is formed between the mounting groove and the inflatable elastic extruder. An air passage connected to the inflation cavity is provided at the roller shaft of the roller assembly. The air passage is connected to an air source through a pipe to inflate the inflation cavity, causing the inflatable elastic extruder to undergo elastic deformation. Both the roller assembly and the extrusion roller are connected to the bearing housing via bearings, and the roller assembly and the extrusion roller are arranged vertically, with the bandage passing between the roller assembly and the extrusion roller.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the roller assembly includes an inflation regulating roller, which includes a main roller body. The main roller body has multiple mounting grooves on its circumferential surface, and both ends of the mounting grooves are open.

[0008] Furthermore, mounting blocks are provided on both sides of the mounting groove, and snap-fit ​​grooves are provided on opposite sides of the two mounting blocks, with both ends of the snap-fit ​​grooves being open.

[0009] Furthermore, a vent hole is provided at the center of the main roller body, and a connecting hole is provided between the vent hole and the mounting groove, and they are interconnected through the connecting hole.

[0010] Furthermore, both ends of the main roller are sealed by side covers. The side covers include two cover plates, and each of the two cover plates has multiple connecting grooves on its opposite side. The connecting grooves correspond to the mounting grooves and are interconnected. Each of the two cover plates has a mounting shaft on its opposite side.

[0011] Furthermore, one end of the mounting shaft is provided with an air inlet hole that penetrates the mounting shaft and the cover plate, and the air inlet hole is connected to the vent hole.

[0012] Furthermore, the inflatable elastic extrusion member includes an inflatable deformable member, which includes a deformable member body disposed inside the mounting groove. An inflation groove is provided on the side surface of the deformable member body facing the vent hole, and the inflation groove is interconnected with the connecting hole.

[0013] Furthermore, snap-fit ​​blocks are provided on both sides of the deformable part body, the snap-fit ​​blocks extend into the interior of the snap-fit ​​groove, and an annular sealing ring is sleeved on the outside of the deformable part body. The annular sealing ring contacts the surface of the mounting block facing the vent hole and extends into the interior of the connecting groove.

[0014] Furthermore, an intake pipe is provided inside the air intake hole. The outer diameter of the intake pipe is smaller than the inner diameter of the air intake hole, and an O-ring is provided between the outer surface of the intake pipe and the inner surface of the air intake hole to seal the gap between the intake pipe and the air intake hole.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This utility model sets up components such as roller assembly and inflatable elastic extrusion component. Through the cooperation between roller assembly and inflatable elastic extrusion component, when the air source inflates the inside of roller assembly, the inflating component undergoes elastic deformation after inflation. The distance between the inflating component and the extrusion roller after elastic deformation is reduced, thereby adjusting the pressure on the core. 2. By setting the side cover, air inlet hard pipe and O-ring seal, the air inlet hard pipe can still inflate the inside of the inflation regulating roller when the roller assembly rotates, thereby ensuring that the roller assembly can rotate normally while achieving the effect of inflation expansion of the inflation component. Attached Figure Description

[0016] Figure 1 A schematic diagram of a pressure strip device for producing adhesive bandages is provided for an embodiment of this utility model; Figure 2 This is a schematic diagram of the roller assembly in an embodiment of the present invention; Figure 3 for Figure 2 Structural sectional view; Figure 4 for Figure 3 Another structural diagram from another perspective; Figure 5 This is a schematic diagram of the structure of the air-inflating adjusting roller in an embodiment of this utility model; Figure 6 for Figure 5 A magnified view of a portion of region A in the middle; Figure 7 This is a schematic diagram of the side cover structure in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the structure of the inflatable component in an embodiment of this utility model; Figure 9 This is a structural diagram from another perspective of the figure; Figure 10 This is a schematic diagram illustrating the usage of two extrusion rollers in the prior art. The attached diagram lists the components represented by each number as follows: 1. Inflation regulating roller; 11. Main roller body; 12. Mounting groove; 13. Mounting cross block; 14. Snap-fit ​​groove; 15. Vent hole; 16. Connecting hole; 2. Side cover; 21. Cover plate; 22. Connecting groove; 23. Mounting shaft; 24. Air inlet hole; 3. Inflation deformation component; 31. Deformation component body; 32. Inflation groove; 33. Annular sealing ring; 34. Snap-fit ​​block; 4. Air inlet hard pipe; 5. Extrusion roller. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0020] Please see Figures 1-4 As shown, a pressure strip device for producing bandages includes: a roller assembly and an inflatable elastic extruder; The roller assembly includes a mounting groove 12, inside which an inflatable elastic extruder is provided. The inflatable elastic extruder extends to the outside of the mounting groove 12, forming an inflation chamber between the mounting groove 12 and the inflatable elastic extruder. The roller shaft of the roller assembly is provided with an air passage connected to the inflation chamber. The air passage is connected to an air source through a pipe to inflate the inflation chamber, causing the inflatable elastic extruder to undergo elastic deformation. The air source includes an air compressor, an air tank, a dryer, and a pressure regulating valve. The air outlet of the air compressor is connected to the air inlet of the air tank, the air outlet of the air tank is connected to the air inlet of the dryer, the air outlet of the dryer is connected to the air inlet of the pressure regulating valve, and the air outlet of the pressure regulating valve is connected to the inflation chamber. The exhaust port of the pressure regulating valve can be used for venting. The pressure inside the inflation chamber can also be automatically adjusted by setting an air pressure sensor, or manually adjusted; the methods are not unique. The roller assembly and the extrusion roller 5 are both connected to the bearing housing via bearings, and the roller assembly and the extrusion roller 5 are arranged vertically, with the bandage passing through the space between the roller assembly and the extrusion roller 5. Based on the above, the roller assembly and the compression roller 5 cooperate with each other, so that when the bandage passes between them, it is squeezed by the roller assembly and the compression roller 5. This is relative to... Figure 10 In the way the two extrusion rollers 5 shown cooperate with each other, the upper extrusion roller 5 is replaced with a roller assembly, and the roller assembly is ensured to be in direct contact with the drug core. The bearings and bearing housings cooperate with each other to support the roller assembly and the extrusion roller 5. The support method here is a mature existing technology. The core technical features of this technical solution are the roller assembly and the pneumatic elastic extrusion component. Therefore, the bearings and bearing housings are not described in detail here. The connection between the air compressor, air tank, dryer, and pressure regulating valve is also a common pneumatic system, which is very common in the field of industrial pneumatics. The pneumatic system here only plays the function of charging and discharging air, which is the basic function of industrial pneumatic systems. Therefore, the specific working principle and structure of each component are not described in detail here.

[0021] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the roller assembly includes an inflation regulating roller 1, which includes a main roller body 11. The main roller body 11 has multiple mounting grooves 12 on its circumferential surface. Both ends of the mounting grooves 12 are open. A vent hole 15 is provided at the center of the main roller body 11. A connecting hole 16 is provided between the vent hole 15 and the mounting grooves 12, and they are interconnected through the connecting hole 16. Mounting blocks 13 are provided on both sides of the inner side wall of the mounting groove 12. Each of the two mounting blocks 13 has a snap-fit ​​groove 14 on the opposite side. Both ends of the snap-fit ​​groove 14 are open. Based on the above, the inflation adjustment roller 1 is a roller body, which can cooperate with the side cover 2 to form a complete roller. The installation groove 12 and the snap-fit ​​groove 14 are provided so that the inflation elastic extrusion can be fixed inside the installation groove 12 by snap-fit. When the air source introduces gas into the vent hole 15, the gas flows into the interior of the installation groove 12 through the connecting hole 16 to achieve the inflation effect.

[0022] like Figures 1-4 as well as Figure 7As shown, both ends of the main roller body 11 are sealed by side covers 2. The side covers 2 include two cover plates 21. Each of the two cover plates 21 has multiple connecting grooves 22 on its opposite side. The connecting grooves 22 correspond to the mounting grooves 12 and are interconnected. Each of the two cover plates 21 has a mounting shaft 23 on its opposite side. A rubber sealing ring can be provided between the two cover plates 21 and the main roller body 11 to further increase the sealing performance. One end of the mounting shaft 23 is provided with an air inlet 24 that passes through the mounting shaft 23 and the cover plate 21, and the air inlet 24 is in communication with the vent 15; like Figures 2-4 As shown, an air intake hard pipe 4 is provided inside the air intake hole 24. The outer diameter of the air intake hard pipe 4 is smaller than the inner diameter of the air intake hole 24, and an O-ring is provided between the outer surface of the air intake hard pipe 4 and the inner surface of the air intake hole 24 to seal the gap between the air intake hard pipe 4 and the air intake hole 24. Based on the above, the side cover 2 and the inflation adjustment roller 1 are connected to each other to form a complete roller. The cover plate 21 can be connected to the main roller body 11 by screws. At this time, the cover plate 21 can block both ends of the mounting groove 12, so that the inflatable elastic extrusion part cannot fall off from the open ends of the mounting groove 12. The connecting groove 22 is connected to the mounting groove 12, and then it fits tightly with the annular sealing ring 33 to increase its sealing performance. The air inlet 24 and the air inlet hard pipe 4 cooperate with each other so that when the roller assembly can rotate around the mounting shaft 23, the air inlet hard pipe 4 can pass gas into the interior of the air inlet 24, and the air inlet hard pipe 4 and the air inlet 24 are sealed by an O-ring.

[0023] like Figure 4 , Figure 8 and Figure 9 As shown, the inflatable elastic extrusion includes an inflatable deformable component 3. The inflatable deformable component 3 is preferably made of thermoplastic polyurethane (TPU) with Shore A85, which has an elongation at break of ≥500% and a resilience of ≥80%. Butyl rubber (Shore A70, suitable for high airtightness requirements) or silicone (Shore A70, suitable for temperature-resistant applications) can also be used. The inflatable deformable component 3 includes a deformable component body 31 disposed inside the mounting groove 12. An inflation groove 32 is provided on the side surface of the deformable component body 31 facing the vent 15. The inflation groove 32 is interconnected with the connecting hole 16. Both sides of the deformable part body 31 are provided with snap-fit ​​blocks 34, which extend into the interior of the snap-fit ​​groove 14. The exterior of the deformable part body 31 is fitted with an annular sealing ring 33, which contacts the surface of the mounting block 13 facing the vent 15 and extends into the interior of the connecting groove 22. Based on the above, when the inflation chamber is filled with enough air, the inflatable deformable part 3 expands under the action of air pressure and undergoes elastic deformation. Taking the inflatable deformable part 3 made of thermoplastic polyurethane material with a thickness of 0.5-2mm as an example, within a reasonable inflation pressure range (e.g., 0.1-0.3MPa), the linear deformation can usually reach 50%-200% of its own thickness, and it returns to its original shape within 3 seconds after unloading (deformation residue ≤0.05mm). When the inflatable deformable part 3 undergoes elastic deformation, the distance between it and the lower extrusion roller 5 changes, thereby achieving the effect of changing the magnitude of the extrusion force on the drug core. The inflation groove 32 serves to temporarily store gas, ensuring that the inflatable deformable part 3 can undergo elastic deformation under air pressure. The snap-fit ​​block 34 allows the inflatable deformable part 3 to be fixed inside the mounting groove 12 by snap-fit. The annular sealing ring 33 further seals the parts, increasing the sealing performance.

[0024] In summary, this pressure strip device replaces the upper and lower pressure rollers 5 by pressing them together, so that the upper pressure roller 5, which is in direct contact with the drug core, is replaced by a roller assembly. By filling the air chamber inside the roller assembly with gas, the inflatable elastic extrusion member collides under the action of air pressure, and then the inflatable elastic extrusion member deforms in the radial direction of the main roller 11. The pressure on the drug core is changed by the elastic deformation of the inflatable elastic extrusion member. Compared to adjusting the distance between the upper and lower extrusion rollers 5 by controlling the lead screw with a motor, this method is more precise, and the cost of the air source system is only between one-half and two-thirds of that of a high-precision lead screw. At the same time, there is no risk of "micro-slippage". The pressure adjustment time is less than or equal to 0.2s (the lead screw adjustment time is greater than or equal to 0.5s). By replacing the inflatable deformation part 3 with different materials, the device can be adapted to cores of different materials.

[0025] The specific work process is as follows: Initial state: The air source system is preset to pressure (e.g., 0.1MPa), the air chamber is not filled, the air-filling deformation component 3 is not deformed, and the initial gap between the roller assembly and the extrusion roller 5 is the core thickness + 0.1mm (e.g., if the core thickness is 1mm, the initial gap is 1.1mm). Feeding and pressing: The bandage (backing + medicated core) enters the extrusion channel at a speed of 10-30 m / min. The control system calls the preset pressure parameters according to the material of the medicated core (e.g., 0.15 MPa for soft medicated core and 0.25 MPa for hard medicated core). Pressure regulation: The gas source system inflates the air through the air inlet pipe 4 into the air vent 15. The gas enters the inflation chamber through the connecting hole 16. Under the action of air pressure, the inflation deformation element 3 bulges outward (deformation 0.3-1.5mm), reducing the distance between it and the extrusion roller 5, and applying pressure (3-15N) to the core. Dynamic adaptation: If the sensor detects a pressure deviation (e.g., the actual pressure is 10% lower than the preset value), the pressure regulating valve automatically increases the air pressure (e.g., from 0.15MPa to 0.17MPa), the deformation of the inflation deformation component increases by 0.2mm, and the pressure is quickly compensated (response time ≤0.2s). Shutdown reset: After production is completed, the pressure regulating valve exhaust port opens, the inflation chamber is depressurized, the inflation deformation part 3 returns to its original shape, and the gap returns to its initial value.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure strip device for producing adhesive bandages, characterized in that, include: Roller assembly and pneumatic elastic extruder; The roller assembly includes a mounting groove (12), and an inflatable elastic extruder is provided inside the mounting groove (12). The inflatable elastic extruder extends to the outside of the mounting groove (12). An inflation chamber is formed between the mounting groove (12) and the inflatable elastic extruder. An air passage connected to the inflation chamber is provided at the roller shaft of the roller assembly. The air passage is connected to an air source through a pipe to inflate the inflation chamber, so that the inflatable elastic extruder undergoes elastic deformation. The roller assembly and the extrusion roller (5) are connected to the bearing housing by bearings, and the roller assembly and the extrusion roller (5) are distributed vertically, with the bandage passing between the roller assembly and the extrusion roller (5).

2. The adhesive strip device for producing wound dressings according to claim 1, characterized in that, The roller assembly includes an air-inflating regulating roller (1), which includes a main roller body (11). The main roller body (11) has multiple mounting grooves (12) on its circumferential surface, and both ends of the mounting grooves (12) are open.

3. The adhesive strip device for producing wound dressings according to claim 2, characterized in that, Mounting blocks (13) are provided on both sides of the mounting groove (12). Each of the two mounting blocks (13) has a snap-fit ​​groove (14) on one side opposite to the other. Both ends of the snap-fit ​​groove (14) are open.

4. The adhesive strip device for producing wound dressings according to claim 3, characterized in that, A ventilation hole (15) is provided at the center of the main roller body (11), and a connecting hole (16) is provided between the ventilation hole (15) and the mounting groove (12), and they are connected to each other through the connecting hole (16).

5. The adhesive strip device for producing wound dressings according to claim 4, characterized in that, The two ends of the main roller body (11) are sealed by side covers (2). The side covers (2) include two cover plates (21). Each of the two cover plates (21) has multiple connecting grooves (22) on its opposite side. The connecting grooves (22) correspond to the mounting grooves (12) and are connected to each other. Each of the two cover plates (21) has a mounting shaft (23) on its opposite side.

6. The adhesive strip device for producing wound dressings according to claim 5, characterized in that, One end of the mounting shaft (23) is provided with an air inlet (24) that passes through the mounting shaft (23) and the cover plate (21), and the air inlet (24) is connected to the vent (15).

7. The bandage production strip device according to claim 5, characterized in that, The inflatable elastic extrusion component includes an inflatable deformable component (3), which includes a deformable component body (31) disposed inside the mounting groove (12). The deformable component body (31) has an inflation groove (32) on one side surface facing the vent (15), and the inflation groove (32) is connected to the connecting hole (16).

8. The bandage production strip applicator according to claim 7, characterized in that, Both sides of the deformable part body (31) are provided with snap-fit ​​blocks (34), the snap-fit ​​blocks (34) extend into the interior of the snap-fit ​​groove (14), and the exterior of the deformable part body (31) is fitted with an annular sealing ring (33), the annular sealing ring (33) contacts the surface of the mounting block (13) facing the vent (15) and extends into the interior of the connecting groove (22).

9. The adhesive strip device for producing wound dressings according to claim 6, characterized in that, An air intake pipe (4) is provided inside the air intake hole (24). The outer diameter of the air intake pipe (4) is smaller than the inner diameter of the air intake hole (24). An O-ring is provided between the outer surface of the air intake pipe (4) and the inner surface of the air intake hole (24) to seal the gap between the air intake pipe (4) and the air intake hole (24).

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