Manufacturing equipment and method of high-strength double-drawing breathable film for hygienic products

Abstract

The invention discloses a manufacturing device and method of a high-strength double-drawing breathable film for hygienic products, and particularly relates to the technical field of breathable film manufacturing. The device comprises a film manufacturing machine, and an adjusting mechanism used for controlling the opening size of an auxiliary discharging opening is arranged on the surface of an auxiliary bin; the surface of the discharging bin is provided with a connecting mechanism used for controlling the opening size of the main discharging port, through the driving mechanism, the adjusting mechanism, the connecting mechanism and the rotating mechanism, the opening of the auxiliary discharging port is adjusted through the first fixing block, then the main discharging port is blocked through the second fixing block, and then the opening size of the main discharging port is adjusted. According to the film extrusion device, a proper material is adopted according to requirements, the material is added into the main material bin and the auxiliary material bin respectively, and then the adjusting mechanism, the connecting mechanism and the rotating mechanism are controlled according to requirements, so that the layer number of the film is flexibly controlled, the films with different layer numbers can be discharged, and the films with different requirements can be processed.

Description

Technical Field

[0001] The present application relates to the technical field of breathable film manufacturing, and more specifically, to a manufacturing device and method for a high-strength double-drawn breathable film for sanitary products. Background Art

[0002] A breathable film is a breathable and waterproof polymer film, which is a new type of polymer waterproof material. It has the functions of waterproofing and breathability due to its microporosity and hydrophobicity. This film is widely used in industries such as medical, personal hygiene products, outdoor lighting, precision electronics, communication, chemical engineering, and security. It is processed through five core modules: raw material treatment, extrusion, stretching, breathable forming, and winding. In recent years, with the improvement of people's living standards, the requirements for breathable films have become higher and higher. Under the condition of ensuring breathability, the requirements for the strength, temperature resistance, and anti-aging ability of breathable films have become higher and higher. For example, in the patent with the patent announcement number CN213564261U, a multi-layer co-extrusion die head for producing films is described. By injecting materials of different materials into multiple feeding ports, the materials pass through the material channels and extrusion ports in sequence to extrude a single-layer film. The multi-layer single-layer films are stacked and passed between two extrusion rollers. Under the dual extrusion action of the two extrusion rollers and through the pulling of the winding roller, the multi-layer single-layer films will be gradually extruded and compounded to form a composite film, thereby obtaining a composite film with good use performance.

[0003] Therefore, when producing films, a multi-layer co-extrusion die head is mostly used for extrusion. Through the design of the co-extrusion structure, the structure of the film is, for example, PP / EVOH / PE. The surface layer (PP) provides rigidity, the core layer (EVOH) improves the barrier performance, the bottom layer (PE) ensures flexibility, the interface enhances the bonding force through a compatibilizer (such as POE), and a microporous foaming agent (such as supercritical CO2) can be added to the middle layer to balance breathability and strength, thereby improving the overall strength of the breathable film.

[0004] However, when using a multi-layer co-extrusion die head, only films with a three-layer structure can be produced. During production, the number of layers of the film cannot be flexibly controlled, and films with the appropriate number of layers cannot be obtained according to requirements, so the practicability is poor.

[0005] Therefore, a manufacturing device and method for a high-strength double-drawn breathable film for sanitary products are proposed for the above problems. Summary of the Invention

[0006] The purpose of the present application is to provide a manufacturing device and method for a high-strength double-drawn breathable film for sanitary products.

[0007] The manufacturing device and method for a high-strength double-drawn breathable film for sanitary products provided by the present application adopt the following technical solutions: A manufacturing device for a high-strength double-drawn breathable film of a sanitary product, including a film manufacturing machine. One end of the film manufacturing machine is provided with a fixed frame. The surface of the fixed frame is fixedly connected with a connecting sleeve. Inside the connecting sleeve, there is a main material bin and two groups of auxiliary material bins. The bottom of the main material bin is provided with a main discharge port. The bottoms of the two groups of auxiliary material bins are provided with auxiliary discharge ports. The bottoms of the main material bin and the two groups of auxiliary material bins are provided with a discharge bin. The surface of the discharge bin is provided with a total discharge port. The surface of the auxiliary material bin is provided with an adjusting mechanism for controlling the opening size of the auxiliary discharge port. The surface of the discharge bin is provided with a connecting mechanism for controlling the opening size of the total discharge port. One end inside the connecting sleeve is provided with a driving mechanism for driving the adjusting mechanism and the connecting mechanism. The surface of the driving mechanism is provided with a rotating mechanism for blocking the main discharge port. The surface of the film manufacturing machine is provided with a conveying mechanism for conveying the breathable film.

[0008] Preferably, the surface of the main material bin is provided with a main feed port. The surfaces of the two groups of auxiliary material bins are provided with auxiliary feed ports. The surface of the connecting sleeve is provided with multiple feed pipes, and the feed pipes are matched with the main feed port and the auxiliary feed ports.

[0009] Preferably, the driving mechanism includes a first driving motor, an electric push rod, a fixed sleeve, a first fixing rod, a first skew equal-diameter bevel gear, a limiting block, a second fixing rod, a limiting groove, and a first gear. One end inside the connecting sleeve is fixedly connected with a first driving motor. One end of the first driving motor is fixedly connected with an electric push rod. The surface of the electric push rod is provided with a fixed sleeve. The surface of the fixed sleeve is fixedly connected with a connecting sleeve. One end of the electric push rod is fixedly connected with a first fixing rod. The surface of the first fixing rod is fixedly connected with a first skew equal-diameter bevel gear. One end of the first fixing rod is fixedly connected with a limiting block. The surface of the limiting block is slidably connected with a second fixing rod. The surface of the second fixing rod is provided with a limiting groove. One end of the limiting block is matched with the limiting groove. One end of the second fixing rod is rotatably connected with a connecting sleeve. The surface of the second fixing rod is fixedly connected with a first gear.

[0010] Preferably, the adjusting mechanism includes a fixing plate, second bevel equal-diameter bevel gears, a first threaded rod, a first connecting plate, a first fixing block, a second connecting plate, and a sliding rod. A fixing plate is fixedly connected to one side of the two auxiliary bins. Two second bevel equal-diameter bevel gears are meshed with the surface of the first bevel equal-diameter bevel gear. A first threaded rod is fixedly connected to the surface of the two second bevel equal-diameter bevel gears. The first threaded rod is matched with the fixed sleeve. One end of the two first threaded rods is rotatably connected to the fixing plate. The surface of the first threaded rod is threadedly connected to the first connecting plate. A first fixing block is fixedly connected to the surface of the first connecting plate. The first fixing block is slidably connected to the inner wall of the two auxiliary bins. A second connecting plate is fixedly connected to one end of the first fixing block. A sliding rod is fixedly connected between one end of the auxiliary bin and the fixing plate. The sliding rod is matched with the second connecting plate.

[0011] Preferably, the connecting mechanism includes a second fixing block, a chute, a first connecting frame, a second connecting frame, a first rack, a card slot, a second rack, and a clamping rod. Two second fixing blocks are slidably connected to the inside of the discharge bin. A chute is opened at one end of the discharge bin. A first connecting frame is fixedly connected to one side of one of the second fixing blocks. A second connecting frame is fixedly connected to one side of the other second fixing block. The chute is matched with the first connecting frame and the second connecting frame. A first rack is fixedly connected to one end of the first connecting frame. A card slot is opened at one end of the first connecting frame. A second rack is fixedly connected to one end of the second connecting frame. A clamping rod is fixedly connected to one end of the second rack. The clamping rod is slidably connected to the inner wall of the card slot. The first gear is meshed with the surface of the first rack and the second rack.

[0012] Preferably, the rotating mechanism includes a bearing, a connecting rod, a third rack, a clamping block, a rotating rod, a second gear, and a baffle. A bearing is rotatably connected to the surface of one end of the electric push rod. A connecting rod is fixedly connected to the surface of the bearing. A third rack is fixedly connected to one end of the connecting rod. A clamping block is fixedly connected to the surface of the third rack. The fixed sleeve is matched with the clamping block. A rotating rod is rotatably connected to the inside of the main bin. A second gear is fixedly connected to one end of the rotating rod, and a baffle is fixedly connected to the other end. One end of the baffle is rotatably connected to the main bin. The third rack is matched with the second gear.

[0013] Preferably, the conveying mechanism includes a second driving motor, a first support rod, a first roller, a support frame, a moving block, a second threaded rod, a second support rod and a second roller. A second driving motor is fixedly connected to one side of the film manufacturing machine. One end of the second driving motor is fixedly connected to a first support rod. A second support rod is fixedly connected to the surface of the first support rod. One end of the first support rod is rotatably connected to the film manufacturing machine. Two groups of support frames are fixedly connected to the top of the film manufacturing machine. A moving block is slidably connected inside the two groups of support frames. A second threaded rod is threadedly connected inside the support frame. One end of the second threaded rod is rotatably connected to the moving block. A second support rod is rotatably connected between the two moving blocks. A second roller is fixedly connected to the surface of the second support rod.

[0014] Preferably, a cooler is provided at one end of the film manufacturing machine, and a double-drawing machine is provided in the middle of the film manufacturing machine.

[0015] Preferably, a cutting machine and a conveyor wheel are provided at the other end of the film manufacturing machine.

[0016] Preferably, the manufacturing method includes the following steps: Step 1: Add the materials for the breathable film into three groups of extruders. The three groups of extruders correspond to the surface layer, the core layer and the bottom layer respectively. Add a compatibilizer to the extruder for the surface layer (PP) to enhance the bonding force of the film. Then add the EVOH material into the extruder for the core layer. Then add a microcellular foaming agent (such as supercritical CO2) into the extruder for the bottom layer (PE) so that the film can balance breathability and strength. Through the twin-screw mixer in the extruder, ensure that the fillers are evenly dispersed. Add the materials in the extruder for the surface layer into one group of auxiliary bins through the feed pipe and the auxiliary feed port. Then add the materials in the extruder for the core layer into the main bin through the feed pipe and the main feed port. Then add the materials in the extruder for the bottom layer into another group of auxiliary bins through the feed pipe and the auxiliary feed port. Step 2: According to requirements, drive the adjusting mechanism and the connecting mechanism through the driving mechanism so that the opening sizes of the total discharge port and the auxiliary feed port can be adjusted to extrude three-layer structure films with different thicknesses. At the same time, through the adjusting mechanism, the opening of the auxiliary feed port can be blocked so that the materials are only extruded from the total discharge port on the main bin, thereby extruding a single-layer structure film structure. Step 3: Drive the rotating mechanism through the electric push rod so that the rotating rod drives the baffle to rotate. The baffle can block the total discharge port so that the materials are extruded from the auxiliary feed ports on the two groups of auxiliary bins, thereby extruding a double-layer film. Step 4: Feed the extruded film into the cooling machine. Cool the film through the cooling rollers on the cooling machine. After cooling, the film is sent into the double-stretching machine through the conveying mechanism. The film is stretched bidirectionally by the double-stretching machine. After the film stretching is completed, the surface of the film is treated. Through corona treatment, the wettability of the film surface is improved. Through plasma coating, the wear resistance of the film is enhanced. After the film treatment is completed, the film is cut by a cutting machine, and the divided film is wound on the conveying wheel for subsequent processing.

[0017] Technical effects and advantages of the present application: Compared with the prior art, for the manufacturing equipment and method of the high-strength double-stretched breathable film of a sanitary product, through the driving mechanism, the adjusting mechanism, the connecting mechanism and the rotating mechanism, the opening of the auxiliary discharge port is adjusted by using the first fixing block, and then the total discharge port is blocked by the second fixing block, so as to adjust the opening size of the total discharge port, so as to extrude a film with a suitable thickness. According to the requirements, appropriate materials are used, and the materials are respectively added into the main material bin and the auxiliary material bin. Then, according to the requirements, the adjusting mechanism, the connecting mechanism and the rotating mechanism are controlled to flexibly control the number of layers of the film, so that different numbers of layers of the film can be discharged, so as to process films with different requirements. Description of the drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a structure in which the film manufacturing machine of the present application is matched with the double-stretching machine; Figure 3 It is a structure in which the fixing frame of the present application is matched with the connecting sleeve; Figure 4 It is a structure in which the main material bin and the auxiliary material bin of the present application are matched; Figure 5 It is a schematic diagram of the structure of the driving mechanism of the present application; Figure 6 It is a structure in which the main material bin and the discharge bin of the present application are matched; Figure 7 It is a schematic diagram of the structure of the adjusting mechanism of the present application; Figure 8 It is a schematic diagram of the structure of the connecting mechanism of the present application; Figure 9 It is a structure in which the main material bin and the main feed port of the present application are matched; Figure 10 It is a structure in which the discharge bin and the total discharge port of the present application are matched; Figure 11 It is a schematic diagram of the structure in which the second fixing rod and the first gear of the present application are matched; Figure 12 It is a schematic diagram of the structure in which the limiting block and the limiting groove of the present application are matched; Figure 13 Schematic structural diagram of the rotating mechanism of the present application; Figure 14 Schematic structural diagram of the cooperation between the thin film manufacturing machine and the fixing frame of the present application; Figure 15 Schematic structural diagram of the conveying mechanism of the present application.

[0019] Reference numerals are: 1, thin film manufacturing machine; 2, fixing frame; 3, connecting sleeve; 4, main material bin; 5, auxiliary material bin; 6, discharge bin; 7, driving mechanism; 701, first driving motor; 702, electric push rod; 703, fixing sleeve; 704, first fixing rod; 705, first skew equal-diameter bevel gear; 706, limiting block; 707, second fixing rod; 708, limiting groove; 709, first gear; 8, adjusting mechanism; 801, fixing plate; 802, second skew equal-diameter bevel gear; 803, first threaded rod; 804, first connecting plate; 805, first fixing block; 806, second connecting plate; 807, sliding rod; 9, connecting mechanism; 901, second fixing block; 902, chute; 903, first connecting frame; 904, second connecting frame; 905, first rack; 906, card slot; 907, second rack; 908, clamping rod; 10, total discharge port; 11, main feed port; 12, main discharge port; 13, auxiliary feed port; 14, auxiliary discharge port; 15, rotating mechanism; 1501, bearing; 1502, connecting rod; 1503, third rack; 1504, clamping block; 1505, rotating rod; 1506, second gear; 1507, baffle; 16, feed pipe; 17, conveying mechanism; 1701, second driving motor; 1702, first support rod; 1703, first roller; 1704, support frame; 1705, moving block; 1706, second threaded rod; 1707, second support rod; 1708, second roller; 18, cooler; 19, double-drawing machine; 20, cutting machine; 21, conveying wheel. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application. Embodiment 1

[0021] As Figures 1 to 15Manufacturing equipment for a high-strength double-drawn breathable film of a sanitary product as shown, including a film manufacturing machine 1. One end of the film manufacturing machine 1 is provided with a fixed frame 2. The surface of the fixed frame 2 is fixedly connected with a connecting sleeve 3. Inside the connecting sleeve 3, there is a main material bin 4 and two groups of auxiliary material bins 5. A main discharge port 12 is opened at the bottom of the main material bin 4. Auxiliary discharge ports 14 are opened at the bottoms of the two groups of auxiliary material bins 5. A discharge bin 6 is provided at the bottoms of the main material bin 4 and the two groups of auxiliary material bins 5. A total discharge port 10 is opened on the surface of the discharge bin 6. An adjusting mechanism 8 for controlling the opening size of the auxiliary discharge port 14 is provided on the surface of the auxiliary material bin 5, which can adjust the opening size of the auxiliary discharge port 14 to extrude a material with a suitable thickness. A connecting mechanism 9 for controlling the opening size of the total discharge port 10 is provided on the surface of the discharge bin 6 to extrude a film with a suitable thickness. At one end inside the connecting sleeve 3, there is a driving mechanism 7 for driving the adjusting mechanism 8 and the connecting mechanism 9. A rotating mechanism 15 for blocking the main discharge port 12 is provided on the surface of the driving mechanism 7 so as to extrude a double-layer structure film by the two groups of auxiliary material bins 5. A conveying mechanism 17 for conveying the breathable film is provided on the surface of the film manufacturing machine 1 for conveying the breathable film after cooling is completed.

[0022] As a preferred embodiment, a main feed port 11 is opened on the surface of the main material bin 4. Auxiliary feed ports 13 are opened on the surfaces of the two groups of auxiliary material bins 5. Multiple feed pipes 16 are provided on the surface of the connecting sleeve 3. The feed pipes 16 are matched with the main feed port 11 and the auxiliary feed ports 13 and are connected to an extruder through the feed pipes 16 so as to add the material in the extruder into the main feed port 11 and the auxiliary feed ports 13 through the feed pipes 16.

[0023] As a preferred embodiment, the driving mechanism 7 includes a first driving motor 701, an electric push rod 702, a fixed sleeve 703, a first fixing rod 704, a first skew equal-diameter bevel gear 705, a limiting block 706, a second fixing rod 707, a limiting groove 708 and a first gear 709. One end inside the connecting sleeve 3 is fixedly connected with a first driving motor 701. One end of the first driving motor 701 is fixedly connected with an electric push rod 702. The surface of the electric push rod 702 is provided with a fixed sleeve 703. The surface of the fixed sleeve 703 is fixedly connected with the connecting sleeve 3. One end of the electric push rod 702 is fixedly connected with a first fixing rod 704. The surface of the first fixing rod 704 is fixedly connected with a first skew equal-diameter bevel gear 705. One end of the first fixing rod 704 is fixedly connected with a limiting block 706. The surface of the limiting block 706 is slidably connected with a second fixing rod 707. The surface of the second fixing rod 707 is provided with a limiting groove 708. One end of the limiting block 706 is matched with the limiting groove 708, so that the limiting block 706 can slide in the limiting groove 708. One end of the second fixing rod 707 is rotatably connected with the connecting sleeve 3. The surface of the second fixing rod 707 is fixedly connected with a first gear 709. Starting the driving mechanism 7 can drive the electric push rod 702 to rotate, so that the electric push rod 702 can drive the second fixing rod 707 to rotate through the first fixing rod 704 and the limiting block 706. The rotation of the first fixing rod 704 and the second fixing rod 707 can drive the first skew equal-diameter bevel gear 705 and the first gear 709 to rotate.

[0024] As a preferred embodiment, the adjusting mechanism 8 includes a fixing plate 801, a second bevel equal-diameter bevel gear 802, a first threaded rod 803, a first connecting plate 804, a first fixing block 805, a second connecting plate 806 and a sliding rod 807. One side of the two auxiliary bins 5 is fixedly connected with the fixing plate 801. The surface of the first bevel equal-diameter bevel gear 705 is meshed with two second bevel equal-diameter bevel gears 802. The surfaces of the two second bevel equal-diameter bevel gears 802 are fixedly connected with the first threaded rod 803. The first threaded rod 803 is matched with the fixed sleeve 703. One end of the two first threaded rods 803 is rotatably connected with the fixing plate 801. The surface of the first threaded rod 803 is threadedly connected with the first connecting plate 804. The surface of the first connecting plate 804 is fixedly connected with the first fixing block 805. The inner wall of the two auxiliary bins 5 is slidably connected with the first fixing block 805. One end of the first fixing block 805 is fixedly connected with the second connecting plate 806. A sliding rod 807 is fixedly connected between one end of the auxiliary bin 5 and the fixing plate 801. The sliding rod 807 is matched with the second connecting plate 806, so that the second connecting plate 806 can slide on the sliding rod 807. The sliding rod 807 and the second connecting plate 806 can limit the first fixing block 805, so that the first fixing block 805 will not shake when moving. When the first fixing rod 704 drives the first bevel equal-diameter bevel gear 705 to rotate, the first bevel equal-diameter bevel gear 705 can drive the second bevel equal-diameter bevel gear 802 and the first threaded rod 803 to rotate, so that the first connecting plate 804 drives the first fixing block 805 to move in the auxiliary bin 5. The first fixing block 805 can block the auxiliary discharge port 14, so as to adjust the thickness of the material discharged from the opening of the auxiliary discharge port 14.

[0025] As a preferred embodiment, the connecting mechanism 9 includes a second fixed block 901, a chute 902, a first connecting frame 903, a second connecting frame 904, a first rack 905, a card slot 906, a second rack 907 and a latch 908. Two groups of second fixed blocks 901 are slidably connected inside the discharge bin 6. A chute 902 is provided at one end of the discharge bin 6. A first connecting frame 903 is fixedly connected to one side of a group of second fixed blocks 901, and a second connecting frame 904 is fixedly connected to one side of the other group of second fixed blocks 901. The chute 902 cooperates with the first connecting frame 903 and the second connecting frame 904. The first connecting frame 903 and the second connecting frame 904 can be limited by the chute 902, so that the first connecting frame 903 and the second connecting frame 904 will not shake when moving. One end of the first connecting frame 903 is fixedly connected to a first rack 905, and a card slot 906 is provided at one end of the first connecting frame 903. One end of the second connecting frame 904 is fixedly connected to a second rack 907, and a latch 908 is fixedly connected to one end of the second rack 907. The latch 908 is slidably connected to the inner wall of the card slot 906, so that the second connecting frame 904 will not shake when moving. The first gear 709 is meshed with the first rack 905 and the second rack 907 on its surface. When the second fixed rod 707 drives the first gear 709 to rotate, the first gear 709 can drive the first rack 905 and the second rack 907 to move inward at the same time, so that the first rack 905 drives one group of second fixed blocks 901 to move inward through the first connecting frame 903, and the second rack 907 drives the other group of second fixed blocks 901 to move inward through the second connecting frame 904, so as to block the total discharge port 10 through the second fixed blocks 901, thereby adjusting the opening size of the total discharge port 10 to extrude a film with a suitable thickness.

[0026] As a preferred embodiment, the rotating mechanism 15 includes a bearing 1501, a connecting rod 1502, a third rack 1503, a clamping block 1504, a rotating rod 1505, a second gear 1506 and a baffle 1507. One end surface of the electric push rod 702 is rotatably connected to the bearing 1501. The surface of the bearing 1501 is fixedly connected to the connecting rod 1502. One end of the connecting rod 1502 is fixedly connected to the third rack 1503. The surface of the third rack 1503 is fixedly connected to the clamping block 1504. The fixed sleeve 703 is matched with the clamping block 1504, so that the clamping block 1504 can slide on the fixed sleeve 703. The bearing 1501 can be limited by the connecting rod 1502, the third rack 1503 and the clamping block 1504. When the first drive motor 701 drives the electric push rod 702 to rotate, the connecting rod 1502, the third rack 1503 and the clamping block 1504 will not rotate accordingly through the bearing 1501. The rotating rod 1505 is rotatably connected to the inside of the main material bin 4. One end of the rotating rod 1505 is fixedly connected to the second gear 1506, and the other end is fixedly connected to the baffle 1507. One end of the baffle 1507 is rotatably connected to the main material bin 4. The third rack 1503 is matched with the second gear 1506. When the electric push rod 702 drives the bearing 1501 and the first fixing rod 704 to move downward, the first skew equal-diameter bevel gear 705 is disengaged from the engaged second skew equal-diameter bevel gear 802. When the bearing 1501 drives the connecting rod 1502, the third rack 1503 and the clamping block 1504 to move downward, the third rack 1503 can drive the second gear 1506 to rotate when moving downward, so that the second gear 1506 drives the baffle 1507 to rotate through the third rack 1503. The main discharge port 12 can be blocked by the baffle 1507 to prevent the materials in the main material bin 4 from being discharged, so as to extrude a double-layer structure film through the two auxiliary material bins 5.

[0027] As a preferred embodiment, the conveying mechanism 17 includes a second driving motor 1701, a first support rod 1702, a first roller 1703, a support frame 1704, a moving block 1705, a second threaded rod 1706, a second support rod 1707 and a second roller 1708. A second driving motor 1701 is fixedly connected to one side of the film manufacturing machine 1. One end of the second driving motor 1701 is fixedly connected to a first support rod 1702. The surface of the first support rod 1702 is fixedly connected to a second support rod 1707. One end of the first support rod 1702 is rotatably connected to the film manufacturing machine 1. Two groups of support frames 1704 are fixedly connected to the top of the film manufacturing machine 1. A moving block 1705 is slidably connected inside the two groups of support frames 1704. A second threaded rod 1706 is threadedly connected inside the support frame 1704. One end of the second threaded rod 1706 is rotatably connected to the moving block 1705. A second support rod 1707 is rotatably connected between the two moving blocks 1705. A second roller 1708 is fixedly connected to the surface of the second support rod 1707. According to the thickness of the film, the second threaded rod 1706 is rotated to move the moving block 1705 in the support frame 1704, and the second roller 1708 is driven to move by the moving block 1705 and the second support rod 1707, so that the distance between the first roller 1703 and the second roller 1708 can be adjusted, so as to convey the film between the first roller 1703 and the second roller 1708 into the double drawing machine 19 for biaxial stretching.

[0028] As a preferred embodiment, a cooling machine 18 is provided at one end of the film manufacturing machine 1. The film can be cooled by the cooling roller on the cooling machine 18. A double drawing machine 19 is provided in the middle of the film manufacturing machine 1. The film can be biaxially stretched by the double drawing machine 19.

[0029] As a preferred embodiment, a cutting machine 20 and a conveying wheel 21 are provided at the other end of the film manufacturing machine 1. After the film is processed, the film is divided by the cutting machine 20, and the divided film is wound on the conveying wheel 21 for subsequent processing.

[0030] As a preferred embodiment, the manufacturing method includes the following steps: Step 1: Add the materials of the breathable film into three sets of extruders, which respectively correspond to the surface layer, the core layer, and the bottom layer. Add a compatibilizer to the extruder for the surface layer (PP) to enhance the bonding force of the film. Then add the EVOH material into the extruder for the core layer, and add a microcellular foaming agent (such as supercritical CO2) into the extruder for the bottom layer (PE) so that the film can balance breathability and strength. Through the twin-screw mixer in the extruder, ensure that the fillers are evenly dispersed. Add the materials in the extruder for the surface layer into one set of auxiliary bins 5 through the feed pipe 16 and the auxiliary feed port 13. Then add the materials in the extruder for the core layer into the main bin 4 through the feed pipe 16 and the main feed port 11. Then add the materials in the extruder for the bottom layer into another set of auxiliary bins 5 through the feed pipe 16 and the auxiliary feed port 13; Step 2: According to requirements, drive the adjusting mechanism 8 and the connecting mechanism 9 through the driving mechanism 7 so that the opening sizes of the total discharge port 10 and the auxiliary feed port 13 can be adjusted to extrude three-layer structure films with different thicknesses. At the same time, through the adjusting mechanism 8, the opening of the auxiliary feed port 13 can be blocked so that the materials are only extruded from the total discharge port 10 on the main bin 4, thereby extruding a single-layer structure film structure; Step 3: Drive the rotating mechanism 15 through the electric push rod 702 so that the rotating rod 1505 drives the baffle 1507 to rotate. The baffle 1507 can block the total discharge port 10 so that the materials are extruded from the auxiliary feed ports 13 on the two sets of auxiliary bins 5, thereby extruding a double-layer film; Step 4: Send the extruded film into the cooler 18, and cool the film through the cooling rollers on the cooler 18. The cooled film is then sent into the double-stretching machine 19 through the conveying mechanism 17, and the film is stretched bidirectionally by the double-stretching machine 19. When the film stretching is completed, then treat the film surface. Through corona treatment, the wettability of the film surface is improved, and through plasma coating, the wear resistance of the film is enhanced. When the film treatment is completed, then cut the film by the cutting machine 20 so that the divided film is wound on the conveying wheel 21 for subsequent treatment.

[0031] The working process of this application is as follows: The materials for the breathable film are added into three groups of extruders, which respectively correspond to the surface layer, the core layer, and the bottom layer. A compatibilizer is added to the extruder for the surface layer (PP) to enhance the bonding force of the film. Then, the EVOH material is added into the extruder for the core layer. Next, a microcellular foaming agent (such as supercritical CO2) is added into the extruder for the bottom layer (PE) so that the film can balance breathability and strength. Through the twin-screw mixer in the extruder, it is ensured that the fillers are evenly dispersed. The materials in the extruder for the surface layer are added into one of the auxiliary bins 5 through the feed pipe 16 and the auxiliary feed port 13. Then, the materials in the extruder for the core layer are added into the main bin 4 through the feed pipe 16 and the main feed port 11. Next, the materials in the extruder for the bottom layer are added into another auxiliary bin 5 through the feed pipe 16 and the auxiliary feed port 13. Starting the driving mechanism 7 can drive the electric push rod 702 to rotate, so that the electric push rod 702 can drive the second fixed rod 707 to rotate through the first fixed rod 704 and the limit block 706. The rotation of the first fixed rod 704 and the second fixed rod 707 can drive the first skew equal-diameter bevel gear 705 and the first gear 709 to rotate. When the first fixed rod 704 drives the first skew equal-diameter bevel gear 705 to rotate, the second skew equal-diameter bevel gear 802 and the first threaded rod 803 can be driven to rotate through the first skew equal-diameter bevel gear 705, so that the first connecting plate 804 drives the first fixed block 805 to move in the auxiliary bin 5. The auxiliary discharge port 14 can be blocked by the first fixed block 805 to adjust the thickness of the material discharged from the opening of the auxiliary discharge port 14. At the same time, the first gear 709 drives the first rack 905 and the second rack 907 to move inward simultaneously, so that the first rack 905 drives one group of second fixed blocks 901 to move inward through the first connecting frame 903, and the second rack 907 drives the other group of second fixed blocks 901 to move inward through the second connecting frame 904, so that the total discharge port 10 is blocked by the second fixed blocks 901, thereby adjusting the opening size of the total discharge port 10, enabling the materials in the main bin 4 to be extruded into the discharge bin, and the materials in the two auxiliary bins 5 to cover the main material. Then, a three-layer structure film is extruded through the total discharge port 10, making the film have higher strength. According to the different added materials, the three-layer structure film is applicable to vacuum food packaging (nylon / EVOH / PE), photovoltaic backplane (weather-resistant layer / insulating layer / adhesive layer), or high-strength breathable film (PP / EVOH / PE).

[0032] The extruded film is sent to the cooling machine 18, and the film is cooled by the cooling roller on the cooling machine 18. The cooled film is then sent to the double-stretching machine 19 through the conveying mechanism 17, and the film is biaxially stretched by the double-stretching machine 19. After the film stretching is completed, the film surface is treated by corona treatment to improve the surface wettability of the film, and then plasma coating is used to enhance the wear resistance of the film. After the film treatment is completed, the film is cut by the cutting machine 20, and the cut film is rolled up on the conveying wheel 21 for subsequent processing. When a double-layer film needs to be extruded, the surface layer (PP) is highly wear-resistant / anti-adhesive (such as the contact layer of sanitary products), the bottom layer (PE) is highly breathable / tough (such as the liquid diversion layer), and the two sets of auxiliary silos 5 are respectively added with appropriate materials. When the electric push rod 702 is started to drive the bearing 1501 and the first fixed rod 704 to move downward, the first oblique equal-diameter bevel gear 705 is moved out from the second oblique equal-diameter bevel gear 802 that is meshed and connected. When the connecting rod 1502, the third rack 1503 and the block 1504 are driven downward by the bearing 1501, the third rack 1503 can drive the second gear 1506 to rotate when it moves downward, so that the second gear 1506 drives the baffle 1507 through the third rack 1503 to move forward. The main discharge port 12 can be blocked by the baffle 1507 to prevent the material in the main silo 4 from being discharged. The first drive motor 701 is then started to adjust the position of the second fixed block 901 in the discharge silo 6 so that a double-layer film of suitable thickness can be extruded through the two sets of auxiliary silos 5. According to the different materials added, the double-layer film is suitable for high-end sanitary products (diaper surface layer / guiding layer) or pharmaceutical blister packaging (printing layer / barrier layer). When a single-layer film needs to be extruded, the drive mechanism 7 is started to drive the first oblique equal-diameter bevel gear 705 to rotate through the electric push rod 702 and the first fixed rod 704. The gear 705 can drive the second oblique equal-diameter bevel gear 802 and the first threaded rod 803 to rotate, so that the first connecting plate 804 drives the first fixed block 805 to move in the auxiliary material bin 5, and the auxiliary discharge port 14 is blocked by the first fixed block 805, so that no material will be discharged from the auxiliary discharge port 14, and pure resins or single composite materials such as PP, PE, PVC, etc. are directly squeezed out from the main material bin 4 and the discharge bin 6. Depending on the added materials, the single-layer structure film is suitable for supermarket shopping bags, ordinary packaging films or agricultural mulch films. The above is the working principle of the manufacturing equipment and method of the high-strength double-drawn breathable film for sanitary products.

Claims

1. A manufacturing device for a high-strength double-drawn breathable film of a sanitary product, comprising a film manufacturing machine (1), one end of the film manufacturing machine (1) is provided with a fixing frame (2), the surface of the fixing frame (2) is fixedly connected with a connecting sleeve (3), the inside of the connecting sleeve (3) is provided with a main material bin (4) and two groups of auxiliary material bins (5), the bottom of the main material bin (4) is provided with a main discharge port (12), the bottoms of the two groups of auxiliary material bins (5) are provided with auxiliary discharge ports (14), the bottom of the main material bin (4) and the two groups of auxiliary material bins (5) is provided with a discharge bin (6), the surface of the discharge bin (6) is provided with a total discharge port (10), and the characteristics are as follows: The surface of the auxiliary material bin (5) is provided with an adjusting mechanism (8) for controlling the opening size of the auxiliary discharge port (14), the surface of the discharge bin (6) is provided with a connecting mechanism (9) for controlling the opening size of the total discharge port (10), one end inside the connecting sleeve (3) is provided with a driving mechanism (7) for driving the adjusting mechanism (8) and the connecting mechanism (9), the surface of the driving mechanism (7) is provided with a rotating mechanism (15) for blocking the main discharge port (12), and the surface of the film manufacturing machine (1) is provided with a conveying mechanism (17) for conveying the breathable film.

2. The manufacturing equipment of a high-strength double-drawn breathable film for sanitary products according to claim 1, characterized in that: The surface of the main material bin (4) is provided with a main feed port (11), the surfaces of two groups of the auxiliary material bins (5) are provided with auxiliary feed ports (13), the surface of the connecting sleeve (3) is provided with a plurality of feed pipes (16), and the feed pipes (16) are matched with the main feed port (11) and the auxiliary feed ports (13).

3. The manufacturing equipment of a high-strength double-drawn breathable film for sanitary products according to claim 1, characterized in that: The driving mechanism (7) includes a first driving motor (701), an electric push rod (702), a fixed sleeve (703), a first fixing rod (704), a first skew equal-diameter bevel gear (705), a limit block (706), a second fixing rod (707), a limit groove (708) and a first gear (709). One end inside the connecting sleeve (3) is fixedly connected with a first driving motor (701), one end of the first driving motor (701) is fixedly connected with an electric push rod (702), the surface of the electric push rod (702) is provided with a fixed sleeve (703), the surface of the fixed sleeve (703) is fixedly connected with the connecting sleeve (3), one end of the electric push rod (702) is fixedly connected with a first fixing rod (704), the surface of the first fixing rod (704) is fixedly connected with a first skew equal-diameter bevel gear (705), one end of the first fixing rod (704) is fixedly connected with a limit block (706), the surface of the limit block (706) is slidably connected with a second fixing rod (707), the surface of the second fixing rod (707) is provided with a limit groove (708), one end of the limit block (706) is matched with the limit groove (708), one end of the second fixing rod (707) is rotatably connected with the connecting sleeve (3), and the surface of the second fixing rod (707) is fixedly connected with a first gear (709).

4. The manufacturing equipment of a high-strength double-drawn breathable film for a sanitary product according to claim 3, characterized in that: The adjusting mechanism (8) includes a fixing plate (801), second skew equal-diameter bevel gears (802), a first threaded rod (803), a first connecting plate (804), a first fixing block (805), a second connecting plate (806) and a sliding rod (807). One side of each of the two auxiliary bins (5) is fixedly connected to a fixing plate (801). The surfaces of the two second skew equal-diameter bevel gears (802) are meshed with the surface of the first skew equal-diameter bevel gear (705). The surfaces of the two second skew equal-diameter bevel gears (802) are fixedly connected to a first threaded rod (803). The first threaded rod (803) is matched with the fixed sleeve (703). One end of each of the two first threaded rods (803) is rotatably connected to the fixing plate (801). The surface of the first threaded rod (803) is threadedly connected to a first connecting plate (804). The surface of the first connecting plate (804) is fixedly connected to a first fixing block (805). The first fixing block (805) is slidably connected to the inner wall of each of the two auxiliary bins (5). One end of the first fixing block (805) is fixedly connected to a second connecting plate (806). A sliding rod (807) is fixedly connected between one end of the auxiliary bin (5) and the fixing plate (801). The sliding rod (807) is matched with the second connecting plate (806).

5. The manufacturing equipment of a high-strength double-drawn breathable film for a sanitary product according to claim 3, characterized in that: The connecting mechanism (9) includes a second fixing block (901), a chute (902), a first connecting frame (903), a second connecting frame (904), a first rack (905), a card slot (906), a second rack (907) and a clamping rod (908). Two second fixing blocks (901) are slidably connected to the inside of the discharge bin (6). A chute (902) is formed at one end of the discharge bin (6). One side of one of the second fixing blocks (901) is fixedly connected to a first connecting frame (903). One side of the other second fixing block (901) is fixedly connected to a second connecting frame (904). The chute (902) is matched with the first connecting frame (903) and the second connecting frame (904). One end of the first connecting frame (903) is fixedly connected to a first rack (905). A card slot (906) is formed at one end of the first connecting frame (903). One end of the second connecting frame (904) is fixedly connected to a second rack (907). One end of the second rack (907) is fixedly connected to a clamping rod (908). The clamping rod (908) is slidably connected to the inner wall of the card slot (906). The surfaces of the first rack (905) and the second rack (907) are meshed with the surface of the first gear (709).

6. The manufacturing equipment of a high-strength double-drawn breathable film for sanitary products according to claim 3, characterized in that: The rotating mechanism (15) includes a bearing (1501), a connecting rod (1502), a third rack (1503), a clamping block (1504), a rotating rod (1505), a second gear (1506) and a baffle (1507). One end surface of the electric push rod (702) is rotatably connected to a bearing (1501). The surface of the bearing (1501) is fixedly connected to a connecting rod (1502). One end of the connecting rod (1502) is fixedly connected to a third rack (1503). The surface of the third rack (1503) is fixedly connected to a clamping block (1504). The fixed sleeve (703) is matched with the clamping block (1504). A rotating rod (1505) is rotatably connected inside the main material bin (4). One end of the rotating rod (1505) is fixedly connected to a second gear (1506), and the other end is fixedly connected to a baffle (1507). One end of the baffle (1507) is rotatably connected to the main material bin (4). The third rack (1503) is matched with the second gear (1506).

7. The manufacturing equipment for a high-strength double-drawn breathable film of a sanitary product according to claim 1, characterized in that: The conveying mechanism (17) includes a second driving motor (1701), a first support rod (1702), a first roller (1703), a support frame (1704), a moving block (1705), a second threaded rod (1706), a second support rod (1707) and a second roller (1708). A second driving motor (1701) is fixedly connected to one side of the film manufacturing machine (1). One end of the second driving motor (1701) is fixedly connected to a first support rod (1702). The surface of the first support rod (1702) is fixedly connected to a second support rod (1707). One end of the first support rod (1702) is rotatably connected to the film manufacturing machine (1). Two groups of support frames (1704) are fixedly connected to the top of the film manufacturing machine (1). A moving block (1705) is slidably connected inside the two groups of support frames (1704). A second threaded rod (1706) is threadedly connected inside the support frame (1704). One end of the second threaded rod (1706) is rotatably connected to the moving block (1705). A second support rod (1707) is rotatably connected between the two groups of moving blocks (1705). The surface of the second support rod (1707) is fixedly connected to a second roller (1708).

8. The manufacturing equipment of a high-strength double-drawn breathable film for sanitary products according to claim 1, characterized in that: A cooler (18) is provided at one end of the film manufacturing machine (1), and a double-drawing machine (19) is provided in the middle of the film manufacturing machine (1).

9. The manufacturing equipment of a high-strength double-drawn breathable film for a sanitary product according to claim 1, characterized in that: A cutting machine (20) and a conveyor wheel (21) are provided at the other end of the film manufacturing machine (1).

10. A manufacturing method of a high-strength double-drawn breathable film for sanitary products, which uses the manufacturing equipment of the high-strength double-drawn breathable film for sanitary products described in any one of claims 1-9, characterized in that: The manufacturing method includes the following steps: Step 1: Add the materials of the breathable film into three sets of extruders, which correspond to the surface layer, the core layer, and the bottom layer respectively. Add a compatibilizer to the extruder for the surface layer to enhance the bonding force of the film. Add EVOH material to the extruder for the core layer. Then add a microcellular foaming agent such as supercritical CO2 to the extruder for the bottom layer, so that the film can balance breathability and strength. Through the twin-screw mixer in the extruder, ensure that the fillers are evenly dispersed. Add the materials in the extruder for the surface layer into one set of auxiliary bins (5) through the feed pipe (16) and the auxiliary feed port (13). Then add the materials in the extruder for the core layer into the main bin (4) through the feed pipe (16) and the main feed port (11). Then add the materials in the extruder for the bottom layer into another set of auxiliary bins (5) through the feed pipe (16) and the auxiliary feed port (13); Step 2: According to the requirements, drive the adjusting mechanism (8) and the connecting mechanism (9) through the driving mechanism (7), so that the opening sizes of the total discharge port (10) and the auxiliary feed port (13) can be adjusted, in order to extrude three-layer structure films with different thicknesses. At the same time, through the adjusting mechanism (8), the opening of the auxiliary feed port (13) can be blocked, so that the materials are only extruded from the total discharge port (10) on the main bin (4), and then a single-layer structure film is extruded; Step 3: Drive the rotating mechanism (15) through the electric push rod (702), so that the rotating rod (1505) drives the baffle (1507) to rotate. The total discharge port (10) can be blocked by the baffle (1507), so that the materials are extruded from the auxiliary feed ports (13) on the two sets of auxiliary bins (5), and then a double-layer film is extruded; Step 4: Send the extruded film into the cooler (18), and cool the film through the cooling rollers on the cooler (18). The cooled film is then sent into the double-stretching machine (19) through the conveying mechanism (17), and the film is biaxially stretched through the double-stretching machine (19). When the film stretching is completed, the surface of the film is then treated. Through corona treatment, the surface wettability of the film is improved. Then through plasma coating, the wear resistance of the film is enhanced. When the film treatment is completed, the film is then cut by the cutting machine (20), and the divided film is wound on the conveying wheel (21) for subsequent processing.

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