A film-coated sheet material production line

Abstract

The application relates to a film-coating process of sheet-shaped materials and a film-coated sheet-shaped material produced by the process, and belongs to the field of sheet-shaped medical materials, which comprises the following steps: S1, preparing glue solution: uniformly dissolving and mixing film-forming agent, plasticizer and organic solvent to prepare glue solution; S2, glue solution coating: coating the glue solution on a film coating platform by using a coating machine to form a glue film; S3, glue film drying: feeding the film coating platform and the glue film into a front drying box to dry to obtain a film body; S4, solvent spraying: spraying the dried film body with organic solvent and placing for timing; S5, film-coating and bonding: a film-coating mechanism coats sheet-shaped materials on the film body sprayed with organic solvent to obtain a film-coated sheet-shaped material after bonding; and S6, film-coating drying: placing the bonded film-coated sheet-shaped material into a rear drying box for drying. The application improves the inconvenient use of water-soluble chitosan non-woven fabric in clinical application and the conditions that the oral cavity application scene is prone to rapid dissolution and poor positioning.

Description

Technical Field

[0001] This application relates to the field of sheet-like medical materials, and in particular to a sheet-like material coating process and the coated sheet-like materials produced therefrom. Background Technology

[0002] With the continuous development of medical technology, people have higher requirements for the speed and prognosis of clinical hemostasis. The method of using local hemostatic materials for clinical hemostasis is receiving more and more attention. Common local hemostatic materials include gelatin sponge, collagen sponge, chitosan cellulose, etc.

[0003] In the related technology, Chinese invention patent document with publication number CN101049513B discloses a water-soluble chitosan-based fiber hemostatic and wound-healing material. This material has hemostatic and wound-healing effects, can gradually absorb water and swell and gradually dissolve to form a colloidal solution, has good local application performance, is non-immunogenic in vivo, has a short degradation time, and good biocompatibility, making it suitable for hemostasis and wound healing applications in vivo and on the body surface.

[0004] Regarding the aforementioned technologies, water-soluble chitosan nonwoven fabrics have shortcomings in surgical and dental applications: In surgical applications, the material easily adheres to clamping instruments, causing inconvenience in operation, and it adheres to dressings, making wound cleaning difficult; in dental applications, it is prone to drifting and difficult to locate the affected area, and dissolves too quickly due to abundant saliva in the mouth. Both sides of the water-soluble chitosan nonwoven fabric dissolve and become sticky when exposed to water in the moist oral cavity. The side away from the wound is prone to adhering to other parts of the oral cavity such as mucosa, teeth, or tongue, causing the nonwoven fabric to shift or adhere to and tear the wound. Furthermore, the simultaneous dissolution of water-soluble chitosan nonwoven fabric on both sides shortens the treatment time and reduces the wound healing effect. Summary of the Invention

[0005] In order to improve the shortcomings of water-soluble chitosan nonwovens in surgical and dental applications, this application provides a sheet material coating process and the coated sheet material produced therefrom.

[0006] Firstly, the sheet material coating process provided in this application adopts the following technical solution:

[0007] The sheet material coating process includes the following steps:

[0008] S1. Preparation of adhesive solution: Mix and dissolve the film-forming agent, plasticizer and organic solvent evenly to prepare the adhesive solution;

[0009] S2, Adhesive coating: Prepare a coating platform, and use a coating machine to coat the adhesive onto the coating platform to form an adhesive film;

[0010] S3. Film drying: The coating platform and the film are sent into the pre-drying oven for drying to obtain the film.

[0011] S4. Solvent spraying: Spray organic solvent onto the dried membrane and then set the timer.

[0012] S5. Lamination and bonding: After the timing is completed, the lamination mechanism will cover the sheet material onto the film body after spraying organic solvent, and the laminated sheet material will be obtained.

[0013] S6. Lamination and Drying: Place the laminated sheet material into the post-drying oven for drying.

[0014] By adopting the above method, the film-forming agent, plasticizer, and organic solvent are first mixed and stirred evenly to form an adhesive solution. A coating machine is then used to evenly spread the adhesive solution onto the surface of the coating platform to form an adhesive film, ensuring a uniform film thickness. Next, the coating platform and the adhesive film are sent to a pre-drying oven for drying and shaping. Organic solvent is sprayed onto the dried film surface, and a timer is set to allow the organic solvent to dissolve the film surface. Then, a laminating mechanism is used to apply sheet material onto the film. Slight downward pressure is applied to the sheet material to ensure thorough bonding between the sheet material and the film. The laminated sheet material is then placed in a post-drying oven for further drying and shaping. Finally, the formed laminated sheet material is peeled off from the coating platform.

[0015] Preferably, the film-forming agent is one or more of ethyl cellulose, nitrocellulose and butyrylated chitosan; the plasticizer is one or more of castor oil, tributyl citrate, acetylated tributyl citrate, sulfonated fish oil and silicone oil; and the organic solvent is one or more of ethanol, methanol, toluene, acetic acid and ethyl acetate.

[0016] By adopting the above scheme, ethyl cellulose, as a film-forming agent, is not easily soluble in water but is easily soluble in organic solvents such as ethanol. The film made of ethyl cellulose is not easily dissolved in the oral cavity and is non-toxic and odorless to the human body. Castor oil, as a plasticizer, improves the flexibility of the film and enhances the comfort of use in the oral cavity.

[0017] Preferably, the coating platform is made of a smooth and flat material, and the coating platform is made of one or more of glass, acrylic, polycarbonate and metal. The material selected for the coating platform is resistant to corrosion and dissolution by organic solvents.

[0018] By adopting the above solution, the coating platform made of smooth and flat material improves the ease of separating the film side of the coated sheet material from the coating platform, reduces the probability of adhesion and damage between the film and the coating platform, and increases the breakage rate and production speed.

[0019] Preferably, the coating platform surface is provided with a non-stick coating to reduce the adhesion of the film to the coating platform.

[0020] By adopting the above solution, the non-stick coating further reduces the probability of adhesion and damage between the adhesive film and the coating platform, thereby improving the yield and production speed.

[0021] Preferably, S7, vacuum drying: the coated sheet material treated in S6 is placed in a vacuum drying oven for further drying, and the residual amount of organic solvent is detected.

[0022] By adopting the above method, the coated sheet material is further dried using a vacuum drying oven, which volatilizes the organic solvents used in the production and processing, thereby reducing the residual amount of organic solvents.

[0023] Preferably, the coating mechanism includes a clamping frame that can clamp and fix sheet material. The coating mechanism is provided with a horizontal sliding member that drives the clamping frame to slide along the width direction of the production line and a vertical sliding member that drives the clamping frame to slide vertically. The clamping frame can coat the sheet material onto the film of the coating platform.

[0024] By adopting the above scheme, the clamping frame moves to one side of the production line under the action of the vertical sliding component and the horizontal sliding component. The worker fixes the sheet material to the clamping frame, and then the vertical sliding component and the horizontal sliding component drive the clamping frame to cover the sheet material onto the film of the coating platform.

[0025] Secondly, the film-coated sheet material production line provided in this application adopts the following technical solution:

[0026] A production line for coated sheet materials includes a coating machine, a front drying chamber, an organic solvent spraying mechanism, a coating mechanism, and a rear drying chamber arranged in sequence. The coating mechanism is used to tightly bond the film and sheet material after the organic solvent has been sprayed. The coating mechanism includes a frame, a coating conveyor belt assembly for conveying the coating platform and a coating assembly for coating are provided on the frame, a cutter for cutting the sheet material is provided on the frame, and a triggering component for triggering the coating assembly is also provided on the frame.

[0027] The coating assembly includes a feeding roller wound with sheet material, a rotating pressure roller above the coating conveyor belt assembly, the sheet material passing around the pressure roller, the pressure roller being a hollow roller with multiple first air suction holes on its cylindrical surface, an air suction pump connected to one end of the pressure roller, an impeller fixed to the end of the pressure roller near the air suction pump, an abutment plate on the frame corresponding to the pressure roller in the downstream direction of the production line, the abutment plate abutting against the pressure roller near the ground and separating the sheet material from the pressure roller, multiple bristles on the side of the abutment plate near the ground, the pressure roller and the abutment plate being able to slide vertically under the action of a triggering component, the pressure roller abutting against the coating platform near the ground.

[0028] By employing the above scheme, the adhesive solution is coated using a coating machine, dried in a pre-drying oven, and sprayed with organic solvents to form a viscous film with one side dissolved. A pressure roller with a first suction hole presses sheet material onto the viscous side of the film to create a coated sheet material. Excess sheet material is cut off with a cutter, and then dried and shaped in a post-drying oven. The shaped coated sheet material is then peeled off from the coating platform. The pressure roller rotates due to airflow from the suction pump, and the first suction hole continuously unfolds and adsorbs sheet material from the feed roller onto the upper side of the film as the pressure roller rotates. While pressing the sheet material onto the film, the suction force generated by the first suction hole enhances the fusion of the undried film and the sheet material, strengthening the bonding strength. A retaining plate separates the sheet material from the pressure roller, reducing the probability of the coated sheet material entangled on the pressure roller. Brush bristles further smooth the sheet material, reducing the probability of wrinkles forming in the coated sheet material.

[0029] Preferably, the triggering assembly includes two trigger blocks that can slide along the width of the production line. When the coating platform abuts against the two trigger blocks on one side, the two trigger blocks move away from each other. Slide rods are provided at both ends of the pressure roller. When the two trigger blocks move away from each other, the two slide rods drive the pressure roller and the abutment plate to move downward. The frame is provided with a return spring, which gives the pressure roller an upward force.

[0030] By adopting the above scheme, when the coating platform abuts against the two trigger blocks on one side, the two trigger blocks move away from each other, and the two slide bars drive the pressure roller and the abutment plate to move downward against the resistance of the return spring. The pressure roller abuts against the film body of the coating platform and performs coating.

[0031] Preferably, the pressure roller is connected to a first connecting pipe, and the end of the first connecting pipe away from the pressure roller is connected to an air pump. The side of the abutment plate closest to the ground has multiple second air suction holes, all of which are connected to the second connecting pipe. The first connecting pipe is equipped with a three-way solenoid valve, and the end of the second connecting pipe away from the abutment plate is connected to the three-way solenoid valve. When laminating, the three-way solenoid valve connects the air pump to the pressure roller. When it is necessary to cut sheet material, the three-way solenoid valve connects the air pump to the second air suction holes of the abutment plate.

[0032] By adopting the above scheme, during lamination, the suction pump drives the pressure roller to rotate via the impeller and uses the first suction hole to drag the sheet material on the feeding roller. When it is necessary to cut the sheet material, the suction pump disconnects from the pressure roller and connects to the second suction hole of the abutment plate, adsorbing the cut end of the rolled sheet material onto the abutment plate, waiting for the arrival of the next coating platform. This reduces the probability that the cut end of the sheet material will get tangled in the lamination conveyor belt assembly or other structures. Furthermore, it maintains the stability of the position of the cut end of the sheet material and improves the accuracy of the docking of the sheet material with the next coating platform.

[0033] Thirdly, the coated sheet material provided in this application adopts the following technical solution:

[0034] A film-coated sheet material includes a water-soluble sheet material, one side of which is provided with a hydrophobic membrane.

[0035] By adopting the above-mentioned scheme, placing the hydrophobic membrane on one side of the water-soluble sheet material enhances the water resistance of the side of the water-soluble sheet material away from the oral mucosa, prolongs the dissolution time of the coated sheet material in the oral cavity, and enhances the effect of the coated sheet material. In addition, the hydrophobic membrane has a lower probability of adhering to other parts of the oral cavity such as the mucosa, teeth, or tongue, improving the positioning accuracy of the coated sheet material in oral use and reducing the probability of it sticking to clamping instruments during surgical use, thus improving the convenience of surgical use.

[0036] In summary, this application has the following beneficial effects:

[0037] 1. Placing a hydrophobic membrane on one side of the water-soluble sheet material enhances the water resistance of the side of the water-soluble sheet material away from the oral mucosa, prolongs the dissolution time of the coated sheet material in the oral cavity, and enhances the effect of the coated sheet material.

[0038] 2. Hydrophobic membranes are less likely to adhere to other parts of the oral cavity such as mucosa, teeth, or tongue, improving the accuracy of positioning of the membrane sheet material in oral use, reducing the probability of it sticking to clamping instruments during surgical use, improving the convenience of surgical use, avoiding adhesion to dressings, making it easier to clean wounds, and avoiding secondary damage to the wound surface.

[0039] 3. The suction pump drives the pressure roller to rotate via the impeller and uses the first suction hole to drag the sheet material on the feeding roller. When it is necessary to cut the sheet material, the suction pump disconnects from the pressure roller and connects to the second suction hole of the abutment plate, reducing the probability that the cut end of the sheet material will get tangled in the coating conveyor belt assembly or other structures, and improving the accuracy of the sheet material docking with the next coating platform. Attached Figure Description

[0040] Figure 1 This is a schematic flowchart of the sheet material coating process according to an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the structure of the prominent coating platform in the sheet material coating process of this application embodiment;

[0042] Figure 3 This is a schematic diagram of the structure of the coating machine for the sheet material coating process according to an embodiment of this application;

[0043] Figure 4This is a schematic diagram of the structure of the prominent coating mechanism in the sheet material coating process of this application embodiment;

[0044] Figure 5 This is a schematic diagram of the structure of a film-coated sheet material production line according to an embodiment of this application;

[0045] Figure 6 This is a schematic diagram of the protruding coating mechanism of the film-coated sheet material production line according to an embodiment of this application;

[0046] Figure 7 This is a schematic diagram of the protruding pressure roller of the film-coated sheet material production line according to an embodiment of this application;

[0047] Figure 8 This is a schematic diagram of the protruding contact plate of the film-coated sheet material production line according to an embodiment of this application;

[0048] Figure 9 This is a cross-sectional view of the protruding impeller of the film-coated sheet material production line according to an embodiment of this application;

[0049] Figure 10 This is a schematic diagram of the structure of the prominent organic solvent spraying mechanism of the film-coated sheet material production line according to an embodiment of this application;

[0050] Figure 11 This is a schematic diagram of the protruding reflux descent mechanism of the film-coated sheet material production line according to an embodiment of this application.

[0051] Explanation of reference numerals in the attached drawings: 1. Coating platform; 11. Water-soluble sheet material; 12. Film body; 2. Recirculation lifting mechanism; 21. First recirculation frame; 22. First recirculation conveyor belt assembly; 23. First cylinder; 3. Recirculation lowering mechanism; 31. Second recirculation frame; 32. Second recirculation conveyor belt assembly; 33. Second cylinder; 34. Bottom recirculation conveyor belt assembly; 4. Material conveyor belt assembly; 41. Coating machine; 42. Front drying chamber; 43. Rear drying chamber; 5. Organic solvent spraying mechanism; 51. Hanger; 52. Spraying pipe; 53. Atomizing nozzle; 54. Liquid pump; 55. Solvent storage tank; 6. Coating mechanism; 61. Frame; 611. Coating conveyor belt assembly; 612. Guide rod; 62. Gantry; 621. Drive cylinder; 622. Cutter; 63. Clamping frame; 631. Clamping block; 64. Rodless cylinder; 65. Lifting cylinder; 651. Lifting beam; 66. Cross beam; 661. Screw mechanism; 662. Pressing cylinder; 663. Brush; 7. Coating assembly; 71. Connecting plate; 711. Feeding roller; 712. Tensioning roller; 72. Pressure roller; 721. Slider; 722. Impeller; 723. First suction hole; 724. First connecting pipe; 725. Suction pump; 73. Abutment plate; 731. Second suction hole; 732. Second connecting pipe; 733. Three-way solenoid valve; 734. Brush bristles; 8. Trigger assembly; 81. Trigger block; 82. Slide rod; 83. Abutment part; 84. Return spring. Detailed Implementation

[0052] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail.

[0053] This application discloses a film coating process for sheet materials.

[0054] Reference Figure 1 and Figure 2 The sheet material coating process includes the following steps:

[0055] S1. Preparation of adhesive solution: Mix and dissolve the film-forming agent, plasticizer and organic solvent evenly to prepare an adhesive solution; the film-forming agent is one or more of ethyl cellulose, nitrocellulose and butyrylated chitin; the plasticizer is one or more of castor oil, tributyl citrate, acetylated tributyl citrate, sulfonated fish oil and silicone oil; the organic solvent is one or more of ethanol, methanol, toluene, acetic acid and ethyl acetate.

[0056] S2. Adhesive Coating: Prepare a coating platform 1, and use a coating machine 41 to coat the adhesive onto the coating platform 1 to form an adhesive film; the coating platform 1 is made of a smooth and flat material, and the coating platform 1 is made of one or more of glass, acrylic, polycarbonate and metal. The material selected for the coating platform 1 is resistant to corrosion and dissolution by organic solvents; the coating platform 1 is 950mm long, 400mm wide and 8mm thick; a non-stick coating is set on the surface of the coating platform 1, and the non-stick coating can be made of polytetrafluoroethylene or ceramic coating and other non-stick materials.

[0057] S3. Film drying: The coating platform 1 and the film are sent into the pre-drying oven 42 for drying to obtain the film 12.

[0058] S4. Solvent spraying: Spray organic solvent onto the dried membrane 12 and set it for a timer. 95% alcohol can be used as the solvent. The waiting time can be selected based on the temperature and humidity of the workshop, and can be 20 to 45 seconds.

[0059] S5. Lamination and bonding: After the timing is completed, the lamination mechanism 6 applies the sheet material to the membrane 12 after it has been sprayed with organic solvent, and the laminated sheet material is obtained. The laminated sheet material includes a water-soluble sheet material 11, and the further water-soluble sheet material 11 can be a water-soluble nonwoven fabric. The water-soluble nonwoven fabric composition includes water-soluble chitosan fiber or other water-soluble cellulose. The hydrophobic membrane 12 is disposed on one side of the water-soluble nonwoven fabric.

[0060] S6. Lamination and Drying: Place the laminated sheet material into the rear drying oven 43 for drying.

[0061] S7. Vacuum drying: The coated sheet material treated in S6 is placed in a vacuum drying oven for further drying, and the residual amount of ethanol is detected.

[0062] S8. Quality Inspection Feedback: Inspect the flatness, integrity, and ethanol residue of the coated sheet material, and adjust the process parameters of each link in the production line according to the test results.

[0063] Reference Figure 3 and Figure 4The coating mechanism 6 includes a clamping frame 63, which can clamp and fix sheet material. Multiple clamping springs are fixedly connected to the clamping frame 63, and clamping blocks 631 are fixedly connected to the ends of the clamping springs away from the clamping frame 63. The clamping springs exert force on the clamping blocks 631 to abut against the clamping frame 63. The coating mechanism 6 is equipped with a horizontal sliding member that drives the clamping frame 63 to slide along the width direction of the production line and a vertical sliding member that drives the clamping frame 63 to slide vertically. The clamping frame 63 can coat the sheet material onto the film body 12 of the coating platform 1. The horizontal sliding member is a rodless cylinder 64, which is horizontally arranged along the width direction of the production line. The vertical sliding member is a vertically arranged lifting cylinder 65, the cylinder body of which is connected to the slide of the rodless cylinder 64, and the extension rod of the lifting cylinder 65 is arranged close to the ground. The telescopic rod of the lifting cylinder 65 is fixedly connected to a lifting beam 651 arranged along the width direction of the production line. The clamping frame 63 is slidably connected to the lifting beam 651 and can slide along the width direction of the production line. A crossbeam 66 is provided on the lifting beam 651, which can slide along the length direction of the production line, i.e., the length direction of the clamping frame 63. A screw mechanism 661 for driving the crossbeam 66 is provided on the lifting beam 651. A vertically arranged pressing cylinder 662 is fixedly connected to the crossbeam 66. A brush 663 is fixedly connected to the telescopic rod of the pressing cylinder 662. The brush 663 is arranged along the width direction of the clamping frame 63. The pressing cylinder 662 can drive the brush 663 to abut against the sheet material.

[0064] Reference Figure 3 and Figure 4 The worker manually fixes the sheet material onto the clamping frame 63. The rodless cylinder 64 and the lifting beam 651 work together to move the clamping frame 63 above the coating platform 1. The lifting cylinder 65 makes the sheet material cover the film 12 of the coating platform 1. Then, the lead screw mechanism 661 and the pressing cylinder 662 work together to drive the brush 663 to move downward and reciprocate to smooth the sheet material. Under the pressing and smoothing action of the brush 663, the sheet material is released from the clamping frame 63 and the clamping block 631. The brush 663 also improves the adhesion between the sheet material and the film 12 and reduces the probability of wrinkles in the sheet material.

[0065] The implementation principle of the sheet material coating process in this application embodiment is as follows: First, the film-forming agent, plasticizer, and organic solvent are mixed and stirred evenly to form an adhesive solution. The adhesive solution is then evenly spread on the surface of the coating platform 1 using a coating machine 41 to form an adhesive film with uniform thickness. Next, the coating platform 1 and the adhesive film are sent into a hot air drying oven for drying and shaping. Organic solvent is sprayed onto the surface of the dried film 12, and a timer is set to wait for the organic solvent to dissolve the surface of the film 12. Then, the sheet material is applied onto the film 12 using a coating mechanism 6. A slight downward pressure is applied to the sheet material to ensure full bonding between the sheet material and the film 12. The coated sheet material is then placed in a subsequent hot air drying oven for further drying and shaping. Finally, the formed coated sheet material is peeled off from the coating platform 1 for vacuum drying and quality inspection feedback.

[0066] This application also discloses a production line for coated sheet materials.

[0067] Reference Figure 5 and Figure 6 A sheet material production line includes, in sequence, a reflux lifting mechanism 2, a coating machine 41, a front drying chamber 42, an organic solvent spraying mechanism 5, a coating mechanism 6, a rear drying chamber 43, and a reflux lowering mechanism 3. A bottom reflux conveyor belt assembly 34 is provided between the reflux lowering mechanism 3 and the reflux lifting mechanism 2. The front drying chamber 42 and the rear drying chamber 43 can be hot air dryers. The front drying chamber 42 surrounds the organic solvent spraying mechanism 5. The coating machine 41, the front drying chamber 42, the organic solvent spraying mechanism 5, and the rear drying chamber 43 are all equipped with a material conveyor belt assembly 4 for transporting the coating platform 1 between the various mechanisms and equipment.

[0068] Reference Figure 6 and Figure 7 The coating mechanism 6 is used to tightly bond the film 12 after spraying organic solvent and the sheet material. The coating mechanism 6 includes a frame 61, on which a coating conveyor belt assembly 611 for conveying the coating platform 1 and a coating assembly 7 for coating are provided. Two guide rods 612 are provided on the frame 61 at the position corresponding to the coating assembly 7, which are arranged along the length of the frame 61. The two guide rods 612 are located on both sides of the coating conveyor belt assembly 611. A gantry frame 62 is fixedly connected to the frame 61 at the position corresponding to the coating assembly 7 near the downstream of the production line. A drive cylinder 621 is fixedly connected to the gantry frame 62. The cylinder body of the drive cylinder 621 is vertically arranged. The telescopic rod of the drive cylinder 621 is connected to a cutter 622. The drive cylinder 621 drives the cutter 622 to cut the sheet material. The frame 61 is also provided with a trigger assembly 8 for triggering the coating assembly 7.

[0069] Reference Figures 6-8The coating assembly 7 includes two connecting plates 71 fixed to the guide rod 612. The two connecting plates 71 are vertically arranged, and a feeding roller 711 for winding sheet material is rotatably connected between the two connecting plates 71. A tension roller 712 is rotatably connected to the connecting plate 71 at the position of the feeding roller 711 near the ground. The sheet material is arranged around the tension roller 712. A rotatable pressure roller 72 is arranged above the coating conveyor belt assembly 611. The sheet material is arranged around the pressure roller 72. The pressure roller 72 is a hollow roller. Multiple first air suction holes 723 are opened on the cylindrical surface of the pressure roller 72. One end of the pressure roller 72 is connected to a first connecting pipe 724. A first connecting rod is rotatably connected to the pressure roller 72. The end of the first connecting pipe 724 away from the pressure roller 72 is connected to an air suction pump 725. An impeller 722 is fixedly connected to the end of the pressure roller 72 near the air suction pump 725. A connecting plate 71 is fixedly connected to an abutment plate 73 near the downstream direction of the production line, corresponding to the pressure roller 72. The abutment plate 73 abuts against the pressure roller 72 near the ground and can separate the sheet material from the pressure roller 72. The abutment plate 73 has multiple second suction holes 731 on the side near the ground. All the second suction holes 731 are connected to a second connecting pipe 732. The first connecting pipe 724 and the second connecting pipe 732 are connected to a three-way solenoid valve 733. When laminating, the three-way solenoid valve 733 connects the suction pump 725 to the pressure roller 72. When it is necessary to cut the sheet material, the three-way solenoid valve 733 connects the suction pump 725 to the second suction holes 731 of the abutment plate 73. The pressure roller 72 and the abutment plate 73 can slide vertically under the action of the trigger component 8, and the pressure roller 72 can abut against the coating platform 1 near the ground.

[0070] Reference Figure 7 and Figure 8 Multiple bristles 734 are fixed to the side of the abutment plate 73 near the ground. All bristles 734 are inclined downward from the direction of the pressure roller 72 away from the pressure roller 72. The lower end of the bristles 734 is at the same horizontal plane as the pressure roller 72 near the ground.

[0071] Reference Figure 5 and Figure 10 The organic solvent spraying mechanism 5 includes two hangers 51 arranged along the length of the production line. A spraying pipe 52 is fixedly connected to the hanger 51. The spraying pipe 52 is connected to multiple atomizing nozzles 53. The atomizing nozzles 53 are arranged facing the material conveyor belt assembly 4. The spraying pipe 52 is connected to a liquid pump 54 and a solvent storage tank 55.

[0072] Reference Figure 7 and Figure 8The trigger assembly 8 includes two trigger blocks 81 slidably connected to the guide rod 612. The trigger blocks 81 can slide along the width direction of the production line. The side of the two trigger blocks 81 that is close to each other is inclined towards each other from the upstream direction to the downstream direction of the production line. When the coating platform 1 abuts against the side of the two trigger blocks 81 that is close to each other, the two trigger blocks 81 move away from each other. The pressure roller 72 has sliders 721 rotatably connected to both ends. The sliders 721 are slidably connected to the connecting plate 71. The sliders 721 slide in the vertical direction. The side of the slider 721 that is close to the ground is fixed to a sliding rod 82. The two sliding rods 82 are provided with abutment parts 83 at the end close to the ground. The abutment parts 83 are horizontally arranged and are inclined downward from the direction away from each other to the direction close to each other. Two trigger blocks 81, with their ends far apart, can abut against two abutting parts 83, with their ends close together. When the two trigger blocks 81 move away from each other, the two slide rods 82 drive the pressure roller 72 and the abutting plate 73 to move downward. A return spring 84 is fixedly connected to the guide rod 612. The return spring 84 is sleeved on the slide rod 82. The end of the return spring 84 away from the guide rod 612 is fixedly connected to the slider 721. The return spring 84 exerts a force on the pressure roller 72 away from the ground.

[0073] Reference Figure 5 and Figure 11 The recirculation lifting mechanism 2 includes a first recirculation frame 21, which is equipped with a first recirculation conveyor belt assembly 22 arranged along the length of the production line. The first recirculation frame 21 is also equipped with a first cylinder 23, which drives the first recirculation frame 21 to rise and fall. The recirculation lowering mechanism 3 includes a second recirculation frame 31, which is equipped with a second recirculation conveyor belt assembly 32 arranged along the length of the production line. The second recirculation frame 31 is also equipped with a second cylinder 33, which drives the second recirculation frame 31 to rise and fall. The completed coating platform 1 returns to the upstream of the production line via the recirculation lowering mechanism 3, the bottom recirculation conveyor belt assembly 34, and the recirculation lifting mechanism 2, ready for the next coating application.

[0074] The implementation principle of the film-coated sheet material production line in this application embodiment is as follows: the adhesive is coated by the coating machine 41, dried by the front drying oven 42 and sprayed with organic solvent to form a film 12 with one side being soluble and sticky. The sheet material is pressed onto the sticky side of the film 12 by the pressure roller 72 with the first air suction hole 723 to form a film-coated sheet material. The excess sheet material is cut off by the cutter 622. Then, the sheet material is dried and shaped by the rear hot air drying oven. The shaped film-coated sheet material is then peeled off from the coating platform 1.

[0075] During production, the pressure roller 72 rotates due to the airflow from the suction pump 725, causing the impeller 722 to rotate. Simultaneously, the first suction hole 723 continuously unfolds and adsorbs sheet material from the feed roller 711 onto the upper side of the film body 12. The pressure roller 72 presses the sheet material onto the film body 12, while the suction force generated by the first suction hole 723 enhances the fusion between the undried film body 12 and the sheet material, strengthening the bond. The abutment plate 73 separates the sheet material from the pressure roller 72, reducing the probability of the coated sheet material wrapping around the pressure roller 72. The brush bristles 734 further smooth the sheet material, reducing the probability of wrinkles forming in the coated sheet material.

[0076] After drying and forming, the coated sheet material is peeled off from the coating platform 1 at the end of the production line. The coating platform 1 is then transported to the beginning of the production line by the return descent mechanism 3, the bottom return conveyor belt assembly 34, and the return lifting mechanism 2 to start the next coating cycle. This speeds up the turnover of the coating platform 1, improves its utilization efficiency, and increases the output per unit time of the product.

[0077] The continuous coating operation of the film body 12 with the rolled sheet material improves the problem of low efficiency of manual coating by workers using tools to clamp a piece of sheet material, improves the degree of automation of enterprise production, and reduces the cost of mass production of products. The coating platform 1 uses the return flow descent mechanism 3, the bottom return flow conveyor belt assembly 34 and the return flow lifting mechanism 2 to quickly circulate at both ends of the production line, improves the utilization efficiency of the coating platform 1 and increases the enterprise's production capacity.

[0078] This application also discloses a film-coated sheet material.

[0079] A sheet-like coating material includes a water-soluble sheet material 11, with a hydrophobic membrane 12 disposed on one side of the water-soluble sheet material 11. The hydrophobic membrane 12 on one side of the water-soluble sheet material 11 enhances the water resistance of the side of the water-soluble sheet material 11 away from the oral mucosa, prolonging the dissolution time of the sheet-like coating material in the oral cavity and enhancing its effectiveness. Furthermore, the hydrophobic membrane 12 has a lower probability of adhering to the oral mucosa, teeth, tongue, or other parts of the body, improving the accuracy of positioning the sheet-like coating material during oral use and reducing the probability of it adhering to clamping instruments during surgical use, thus improving the convenience of surgical use.

[0080] The embodiments of this application improve upon the inconvenience of using water-soluble chitosan nonwoven fabrics in clinical settings and address the issues of rapid dissolution and poor positioning in oral applications.

[0081] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A production line for coated sheet materials, characterized in that: The system includes a reflux lifting mechanism (2), a coating machine (41), a front drying chamber (42), an organic solvent spraying mechanism (5), a coating mechanism (6), a rear drying chamber (43), and a reflux lowering mechanism (3) arranged in sequence. A bottom reflux conveyor belt assembly (34) is provided between the reflux lowering mechanism (3) and the reflux lifting mechanism (2). The coating machine (41), the front drying chamber (42), the organic solvent spraying mechanism (5), and the rear drying chamber (43) are all provided with material conveyor belt assemblies (4) for setting along the processing direction of the production line. The material conveyor belt assembly (4) is used to transport the coating platform (1) between the various mechanisms and equipment. The coating mechanism (6) is used to tightly bond the film (12) after spraying organic solvent with the sheet material. The coating mechanism (6) includes a frame (61), on which a conveyor belt assembly is provided for conveying materials. The coating platform (1) includes a coating conveyor belt assembly (611) and a coating assembly (7) for coating. A cutter (622) for cutting sheet materials is provided on the frame (61), and a trigger assembly (8) for triggering the coating assembly (7) is also provided on the frame (61). The coating assembly (7) includes a feeding roller (711) with sheet materials wound around it. A rotatable pressure roller (72) is provided above the coating conveyor belt assembly (611). The sheet materials are arranged around the pressure roller (72). The pressure roller (72) is a hollow roller. Multiple first suction holes (723) are opened on the cylindrical surface of the pressure roller (72). One end of the pressure roller (72) is connected to a... An air pump (725) and a pressure roller (72) are provided with an impeller (722). When the air pump (725) draws air, the airflow drives the pressure roller (72) to rotate through the impeller (722), and at the same time, the first air intake hole (723) adsorbs the sheet material onto the pressure roller (72). The frame (61) is provided with an abutment plate (73). The abutment plate (73) abuts against the pressure roller (72) and can separate the sheet material from the pressure roller (72). The abutment plate (73) is provided with multiple bristles (734) for smoothing the sheet material and the film (12). The pressure roller (72) and the abutment plate (73) can slide vertically under the action of the trigger component (8). The pressure roller (72) can abut against the film body (12) of the coating platform (1); the trigger assembly (8) includes two trigger blocks (81) that can slide along the width direction of the production line. When the coating platform (1) abuts against the two trigger blocks (81) and they approach each other, the two trigger blocks (81) move away from each other. The pressure roller (72) is provided with slide rods (82) at both ends. When the two trigger blocks (81) move away from each other, the two slide rods (82) drive the pressure roller (72) and the abutment plate (73) to move downward. The frame (61) is provided with a return spring (84), which gives the pressure roller (72) an upward force. The pressure roller (72) is connected to the first connecting pipe (724), which is connected to the suction pump (725). The abutment plate (73) has multiple second suction holes (731) for adsorbing sheet materials. All the second suction holes (731) are connected to the second connecting pipe (732). The first connecting pipe (724) and the second connecting pipe (732) are connected to the three-way solenoid valve (733). When the film is being coated, the three-way solenoid valve (733) connects the suction pump (725) to the pressure roller (72). When the sheet material needs to be cut, the three-way solenoid valve (733) connects the suction pump (725) to the second suction hole (731) of the abutment plate (73).

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