Anti-aging treatment method of polypropylene synthetic paper

Abstract

The invention relates to an anti-aging treatment method of polypropylene synthetic paper applied to the related technical field of polypropylene synthetic paper, through the arrangement of a scraping unit, on one hand, secondary scraping coating can be performed on coated slurry so as to achieve the purpose of homogenization, and on the other hand, the scraping unit can perform real-time monitoring on the coating condition of the slurry, so that the coating efficiency of the slurry is improved. When local slurry is too much or overall material distribution is too much, the slurry can be accumulated at the scraping plate and the pre-pressing folded plate, when the accumulation amount is too much, the sensing layer can be extruded, the abnormity during slurry coating can be known in time in cooperation with image information obtained by the high-definition camera, and then the material distribution system can respond and adjust in time; therefore, stable and uniform coating of the slurry is effectively guaranteed, the uniformity problems of too much and too little local slurry and the like in the prior art are greatly reduced, and the finished product quality of the polypropylene synthetic paper is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to an anti-aging treatment method for polypropylene synthetic paper, and in particular to an anti-aging treatment method for polypropylene synthetic paper applied to the technical field related to polypropylene synthetic paper. Background Art

[0002] Synthetic paper is a semi-finished paper made of synthetic polymer materials (such as polyethylene, polypropylene, etc.) by film drawing (pressing or blowing), and then made into paper by chemical or physical methods, such as sanding to increase opacity, and treating the surface with chemicals to obtain liquid-repellent properties. Another type of synthetic paper product can use synthetic pulp, which is made after pulping. Synthetic paper has extremely high tensile strength, extremely high tear strength, good insulation properties, optical properties and excellent wet strength. It is used as insulation material, nautical paper, military map paper, etc.

[0003] When anti-aging treatment is performed on polypropylene synthetic paper, there are generally two aspects, chemical and physical. The chemical anti-aging treatment is to first add some stabilizers, antioxidants, etc. to the production raw materials of synthetic paper. For example, the specification of Chinese patent CN110886127A discloses a method for preparing antibacterial and antistatic release paper. The physical anti-aging treatment is to coat a protective layer on the surface of synthetic paper to achieve durability, waterproofness, weather resistance and anti-aging performance. For example, the specification of Chinese patent CN107190563A discloses an anti-aging laser anti-counterfeiting packaging material. However, when physically coating with anti-aging, it is often easy to have uniformity problems such as too much or too little local slurry, which affects the quality of the finished product of polypropylene synthetic paper. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that during the physical anti-aging treatment, the problem of uneven slurry coating is likely to occur, which affects the quality of the finished synthetic paper.

[0005] In order to solve the above problems, the present invention provides an anti-aging treatment method for polypropylene synthetic paper, comprising the following steps: S1. First, adding an appropriate amount of antioxidant, light stabilizer and heat stabilizer to the raw material of polypropylene synthetic paper, and then manufacturing the polypropylene synthetic paper to obtain polypropylene synthetic paper; S2, coating a protective layer on the outer surface of the polypropylene synthetic paper, and sequentially arranging a coating roller, a scraping unit and a drying device between the unwinding and rewinding of the polypropylene synthetic paper, wherein the drying device is closer to the rewinding end; S3, preliminarily coating the protective layer slurry on the surface of the polypropylene synthetic paper through the coating roller of the distributing system, and scraping the coated slurry through the scraping unit to evenly distribute the slurry and eliminate pores and local protrusions; S4, the scraper unit monitors the amount of coating slurry and the uniformity of the coating. When too much coating accumulates at the scraper unit, the coating system reduces the amount of coating after receiving feedback. When the coating amount is too much or too little locally, the coating roller is adjusted in time to make the coating uniform, thereby obtaining a uniform slurry layer. S5, the polyethylene synthetic paper after being laid and scraped passes through a drying device under the action of winding, so that the uniform slurry layer is solidified and shaped to obtain an anti-aging protective layer, thereby completing the anti-aging treatment of the polypropylene synthetic paper; The scraper unit includes a steering roller with a control center, a scraper plate fixedly connected to the bottom of the steering roller, and a pre-pressure folding plate fixedly connected to the lower end of the steering roller facing the coating roller. The lower end of the pre-pressure folding plate is in contact with the end face of the scraper plate, and a high-definition camera is fixedly installed at the lower end of the turning point of the pre-pressure folding plate. The shooting end of the high-definition camera faces the connection between the scraper plate and the pre-pressure folding plate.

[0006] In the above-mentioned anti-aging treatment method for polypropylene synthetic paper, through the setting of the scraper unit, on the one hand, the coated slurry can be scraped twice to achieve the purpose of homogenization. At the same time, the scraper unit can monitor the coating condition of the slurry in real time, so that the distribution system can respond and adjust in time, thereby effectively ensuring the stability and uniformity of the slurry, thereby greatly reducing the uniformity problems such as excessive or insufficient local slurry in the prior art, and effectively ensuring the quality of the finished product of polypropylene synthetic paper.

[0007] As a further improvement of the present application, the protective layer is one of a polyethylene coating, a polypropylene coating, a polyester coating, an acrylic resin coating, and a silicone coating.

[0008] As a further improvement of the present application, the pre-pressed folding plate includes a fold line segment fixedly connected to the steering roller, a transition segment attached to the scraper plate, and a sensing layer. The lower surface of the sensing layer is higher than the lower end of the scraper plate, and the two ends of the transition segment are fixedly connected to the fold line segment and the sensing layer respectively. The upper surface of the slurry on the polypropylene synthetic paper between the coating roller and the scraper unit is lower than the bottom of the sensing layer.

[0009] As a further improvement of the present application, the sensing layer includes two reference plates and multiple pressure-sensitive plates located between the two reference plates. The multiple pressure-sensitive plates include a back plate and an elastic layer fixedly connected to one end of the back plate near the scraper plate. The multiple back plates are all slidably connected to the transition section. Two adjacent pressure-sensitive plates and the reference plate and the adjacent pressure-sensitive plate are in contact with each other. The two reference plates and the multiple pressure-sensitive plates are commonly provided with sensing units.

[0010] As a further improvement of the present application, the outer surfaces of multiple pressure-sensitive sheets are covered with a protective film, which completely covers the contact between the reference sheet and the adjacent pressure-sensitive sheet, the contact between two adjacent pressure-sensitive sheets, and the contact between the scraper plate and the pressure-sensitive sheet, and the lower end edge of the protective film is fixedly connected to the scraper plate.

[0011] As a further improvement of the present application, the sensing unit includes a laser transmitter and a laser receiver respectively fixedly embedded in opposite ends of two reference plates, and pressure-sensitive holes drilled in multiple pressure-sensitive plates. The multiple pressure-sensitive holes, laser transmitter and laser receiver are all coaxially arranged.

[0012] As another modification of the present application, a re-check groove is further opened in the pressure-sensitive sheet, the re-check groove is located directly below the pressure-sensitive hole, and the two are interconnected. A re-sensing unit is also arranged in the re-check groove, and the re-sensing unit includes an electromagnetic sheet fixedly connected to the inner wall in the middle part of the re-check groove, a positioning rod fixedly connected to one end of the electromagnetic sheet, a moving magnetic column located at the other end of the electromagnetic sheet, and a pressure sensor installed at the end of the positioning rod.

[0013] As another improved supplement of the present application, the ends of the positioning rod and the moving magnetic column are both located inside the re-inspection slot, and the end of the moving magnetic column is a concave arc surface structure, and the end of the pressure sensor is flush with the mouth of the re-inspection slot.

[0014] In summary, through the setting of the scraper unit, on the one hand, the coated slurry can be scraped for the second time to achieve the purpose of homogenization. At the same time, the scraper unit can monitor the coating condition of the slurry in real time. When there is too much slurry locally or too much overall cloth, the slurry will accumulate on the scraper plate and the pre-pressure folding plate. When the accumulation amount is too much, it will squeeze the perception layer. In conjunction with the image information obtained by the high-definition camera, the abnormality of slurry coating can be understood in time, so that the cloth system can respond and adjust in time, thereby effectively ensuring the stable and uniform coating of the slurry, thereby greatly reducing the uniformity problems such as excessive or insufficient local slurry in the prior art, and effectively ensuring the quality of the finished product of polypropylene synthetic paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a main flow chart of the first implementation method of the present application; Figure 2 A cross-sectional view of a scraper unit according to a first embodiment of the present application; Figure 3 This is a schematic diagram of the principle of monitoring the amount and uniformity of fabric in the first embodiment of the present application; Figure 4 This is a front view schematic diagram of the scraper unit part of the first embodiment of the present application; Figure 5 A side view of a scraper unit according to a first embodiment of the present application; Figure 6 This is a side view of the scraper unit when there is excessive slurry locally in the first embodiment of the present application; Figure 7 This is a schematic diagram of a partial cross-section of a sensing layer according to a second embodiment of the present application; Figure 8 This is a schematic diagram of a cross section of the front part of the sensing layer of the second embodiment of the present application; Fig. 9 This is a partial front cross-sectional view of the second embodiment of the present application when the sensing layer is normal and two complex sensing units are in conflict with each other under the action of magnetic repulsion; Fig.10 This is a partial front cross-sectional view of the second embodiment of the present application when the sensing layer is in an abnormal misalignment and two adjacent complex sensing units cannot interfere with each other; Fig.11 This is a side schematic diagram of the second embodiment of the present application when the sensing layer is in a misaligned state and two adjacent complex sensing units are misaligned with each other.

[0016] Description of the numbers in the figure: 1. Direction adjustment roller, 2. Scraper plate, 3. Pre-pressure folding plate, 31. Folding line segment, 32. Transition segment, 33. Pressure-sensitive sheet, 331. Back plate, 332. Elastic layer, 333. Protective film, 34. Reference sheet, 301. Pressure-sensitive hole, 302. Laser transmitter, 303. Laser receiver, 304. Re-inspection slot, 4. High-definition camera, 41. Electromagnetic sheet, 42. Positioning rod, 43. Moving magnetic column, 5. Pressure sensor. DETAILED DESCRIPTION

[0017] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0018] The first implementation method: Figure 1 An anti-aging treatment method for polypropylene synthetic paper is shown, comprising the following steps: S1. First, a proper amount of antioxidant, light stabilizer and heat stabilizer are added to the raw material of polypropylene synthetic paper, and then the polypropylene synthetic paper is manufactured to obtain the polypropylene synthetic paper. The specific production steps of the polypropylene synthetic paper belong to the well-known technical operations of those skilled in the art, and do not belong to the protection content of this scheme, so they are not described in detail. The specific addition of antioxidant, light stabilizer and heat stabilizer can be adjusted according to actual needs. S2, coating a protective layer on the outer surface of the polypropylene synthetic paper, and sequentially arranging a coating roller, a scraping unit and a drying device between the unwinding and rewinding of the polypropylene synthetic paper, wherein the drying device is closer to the rewinding end; S3, preliminarily coating the protective layer slurry on the surface of the polypropylene synthetic paper through the coating roller of the distributing system, and scraping the coated slurry through the scraping unit to evenly distribute the slurry and eliminate pores and local protrusions; S4, such as Figure 2The scraper unit monitors the amount of coating slurry and its uniformity. When too much material accumulates at the scraper unit, the material distribution system receives feedback and reduces the material distribution. When the material distribution is excessive or insufficient locally, the material distribution roller is adjusted in time to make the material distribution uniform, thereby obtaining a uniform slurry layer. S5, the polyethylene synthetic paper after being laid and scraped passes through a drying device under the action of winding, so that the uniform slurry layer is solidified and shaped to obtain an anti-aging protective layer, thereby completing the anti-aging treatment of the polypropylene synthetic paper; like Figure 2 and Figure 3 The scraper unit includes a steering roller 1 with a control center, a scraper plate 2 fixedly connected to the bottom of the steering roller 1, and a pre-pressing folding plate 3 fixedly connected to the lower end of the steering roller 1 facing the coating roller. The lower end of the pre-pressing folding plate 3 is in contact with the end surface of the scraper plate 2, and a high-definition camera 4 is fixedly installed at the lower end of the turning point of the pre-pressing folding plate 3. The shooting end of the high-definition camera 4 faces the connection between the scraper plate 2 and the pre-pressing folding plate 3. The high-definition camera 4 is used to obtain image information of the accumulated slurry at the scraper plate 2, so as to analyze and judge whether there is excessive accumulation of slurry. The scraper plate 2 is used to scrape the slurry for the second time, thereby forcing the slurry to be redistributed to a certain extent, effectively eliminating the problem of uneven thickness of the protective layer caused by excessive local slurry.

[0019] The protective layer is one of polyethylene coating, polypropylene coating, polyester coating, acrylic resin coating and silicone coating. The specific one can be selected and set by the technicians according to actual needs during the specific implementation.

[0020] like Figure 4-5 , a in the figure represents a laser beam, the pre-pressed folding plate 3 includes a folding line segment 31 fixedly connected to the steering roller 1, a transition segment 32 attached to the scraper plate 2 and a sensing layer, the lower surface of the sensing layer is higher than the lower end of the scraper plate 2, the two ends of the transition segment 32 are respectively fixedly connected to the folding line segment 31 and the sensing layer, the upper surface of the slurry between the coating roller and the scraper unit on the polypropylene synthetic paper is lower than the bottom of the sensing layer, the sensing layer includes two reference sheets 34 and a plurality of pressure-sensitive sheets 33 located between the two reference sheets 34, the plurality of pressure-sensitive sheets 33 include a back plate 331 and a back plate 331 fixedly connected to the back plate 331 near the scraper plate 2 The elastic layer 332 at one end and the plurality of back plates 331 are all slidably connected with the transition section 32. Two adjacent pressure-sensitive sheets 33 and the reference sheet 34 are in contact with each other. The two reference sheets 34 and the plurality of pressure-sensitive sheets 33 are provided with sensing units. The sensing units include laser emitters 302 and laser receivers 303 respectively fixedly embedded at opposite ends of the two reference sheets 34, and pressure-sensitive holes 301 drilled in the plurality of pressure-sensitive sheets 33. The plurality of pressure-sensitive holes 301, the laser emitters 302 and the laser receivers 303 are all coaxially arranged. When there is not too much slurry, such as Figure 2 , the upper surface of the slurry is located below the bottom of the pre-pressing folding plate 3, and it is not easy to accumulate at the scraper plate 2 and the pre-pressing folding plate 3, so the slurry will not produce a pushing force on the sensing layer of the pre-pressing folding plate 3. At this time, the multiple pressure-sensitive holes 301 are still coaxial, and the laser beam emitted by the laser transmitter 302 can penetrate the multiple pressure-sensitive holes 301 and project onto the laser receiver 303; Figure 6 , and when there is too much cloth or too much slurry locally, the slurry will gradually accumulate on the scraper plate 2 near the unwinding side and gradually approach the pre-pressing folding plate 3, thereby generating a certain pushing force on the pressure-sensitive sheet 33. At this time, one or more back plates 331 at the place where there is too much slurry move toward the scraper plate 2, so that the elastic layer 332 is compressed, and then the pressure-sensitive holes 301 on the pressure-sensitive sheet 33 or multiple pressure-sensitive sheets 33 are misaligned with the laser emitter 302. At this time, the laser beam emitted by the laser emitter 302 cannot completely penetrate the multiple pressure-sensitive holes 301 and shoot on the laser receiver 303, then the laser receiver 303 cannot receive the laser signal. At this time, the laser beam range of the laser transmitter 302 is shortened. The control center can roughly locate the part with excessive slurry according to the range of the laser. Based on this, the abnormality of the cloth can be detected in time. The electrical signal and the image information obtained by the high-definition camera 4 are fed back to the control center together, which can effectively analyze and derive the phenomenon of excessive cloth or excessive local slurry. When the overall cloth is too much, the cloth system can be adjusted in time to reduce the cloth. When there is too much local slurry, it may be that the steering roller 1 is worn or other abnormalities occur. The staff can perform maintenance and repair according to the actual situation.

[0021] It is worth noting that during use, the steering roller 1 can be controlled to rotate, thereby changing the angle and gap between the scraper plate 2 and the synthetic paper, so as to adjust the thickness of the protective layer.

[0022] like Figure 5 The outer surfaces of the multiple pressure-sensing sheets 33 are covered with a protective film 333, which completely covers the contact between the reference sheet 34 and the adjacent pressure-sensing sheet 33, the contact between two adjacent pressure-sensing sheets 33, and the contact between the scraper plate 2 and the pressure-sensing sheet 33, and the lower end edge of the protective film 333 is fixedly connected to the scraper plate 2. The protective film 333 can effectively block the multiple gaps between the multiple pressure-sensing sheets 33 and the two reference sheets 34, effectively preventing the slurry from being embedded in the gaps and affecting the perception accuracy of the perception layer to the slurry abnormality. In actual use, the protective film 333 can be made of a transparent plastic film and bonded to the target position. It can be replaced after a certain period of time to maintain the detection accuracy.

[0023] In summary, through the setting of the scraper unit, on the one hand, the coated slurry can be scraped for the second time to achieve the purpose of homogenization. At the same time, the scraper unit can monitor the coating condition of the slurry in real time. When there is too much slurry locally or too much overall cloth, the slurry will accumulate on the scraper plate 2 and the pre-pressure folding plate 3. When the accumulation amount is too much, it will squeeze the perception layer. In conjunction with the image information obtained by the high-definition camera 4, the abnormality during slurry coating can be understood in time, so that the cloth system can respond and adjust in time, thereby effectively ensuring the stable and uniform coating of the slurry, thereby greatly reducing the uniformity problems such as excessive or insufficient local slurry in the prior art, and effectively ensuring the quality of the finished product of polypropylene synthetic paper.

[0024] The second implementation method: Based on the first embodiment, this embodiment adds a complex sensing unit and related structures, and the rest of the parts are consistent with the first embodiment.

[0025] Figure 7-8 As shown, a re-inspection groove 304 is further excavated in the pressure-sensitive sheet 33, and the re-inspection groove 304 is located directly below the pressure-sensitive hole 301, and the two are interconnected. A re-sensing unit is also arranged in the re-inspection groove 304, and the re-sensing unit includes an electromagnetic sheet 41 fixedly connected to the inner wall of the middle part of the re-inspection groove 304, a positioning rod 42 fixedly connected to one end of the electromagnetic sheet 41, a dynamic magnetic column 43 located at the other end of the electromagnetic sheet 41, and a pressure sensor 5 installed at the end of the positioning rod 42. During each cloth laying, multiple electromagnetic sheets 41 can be controlled to be energized to generate a repulsive force on multiple dynamic magnetic columns 43, thereby causing multiple dynamic magnetic columns 43 to move toward the re-inspection grooves 304 in adjacent pressure-sensitive sheets 33. When the positions of multiple pressure-sensitive sheets 33 are normal and no abnormalities occur, multiple pressure-sensitive holes 301 and laser emitters 302 are coaxial, and corresponding multiple re-inspection grooves 304 are coaxial, such as Fig. 9 At this time, the moving magnetic column 43 can smoothly enter the adjacent re-test slot 304, so that the end of the moving magnetic column 43 can collide with the pressure sensor 5 to generate force data; Fig.11 When the elastic force of part of the elastic layer 332 is damaged or other reasons cause one or more pressure-sensitive sheets 33 to be slightly misaligned with the laser emitter 302, the laser emitted by the pressure-sensitive hole 301 can still be projected onto the laser emitter 302. At this time, it is difficult to detect the abnormality of the part of the pressure-sensitive sheet 33 by relying on the sensing unit. Then, under the action of the re-sensing unit, such as Fig.10Due to the misalignment of the re-inspection groove 304, under the action of magnetic repulsion, the dynamic magnetic column 43 will conflict with the edge of the mouth of the re-inspection groove 304, and it is difficult to enter the adjacent re-inspection groove 304. Due to the concave arc at the end of the dynamic magnetic column 43, the pressure sensor 5 will not be triggered. Based on this difference, the abnormality at the pre-pressure folding plate 3 can be discovered before the coating begins, which effectively ensures its stable detection accuracy when coating the slurry. At the same time, during the detection, it is also convenient to locate the abnormality more accurately, which is convenient for the staff to carry out targeted inspection and maintenance of the cloth abnormality.

[0026] The ends of the positioning rod 42 and the moving magnetic column 43 are both located on the inner side of the re-inspection groove 304, and the end of the moving magnetic column 43 is a concave arc structure. The end of the pressure sensor 5 is flush with the mouth of the re-inspection groove 304, so that the pressure sensor 5 can only be triggered when the moving magnetic column 43 enters the adjacent re-inspection groove 304.

[0027] It is worth noting that in the above detection process, after each detection, the moving magnetic pole 43 is controlled to pass reverse current again, thereby effectively ensuring that multiple moving magnetic poles 43 can completely return to their own re-inspection slots 304, so that they are not easily affected by the adjacent pressure-sensitive plates 33 to monitor the slurry normally.

[0028] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An anti-aging treatment method for polypropylene synthetic paper, characterized in that: The following steps are involved: S1. First, adding an appropriate amount of antioxidant, light stabilizer and heat stabilizer to the raw material of polypropylene synthetic paper, and then manufacturing the polypropylene synthetic paper to obtain polypropylene synthetic paper; S2, coating a protective layer on the outer surface of the polypropylene synthetic paper, and sequentially arranging a coating roller, a scraping unit and a drying device between the unwinding and rewinding of the polypropylene synthetic paper, wherein the drying device is closer to the rewinding end; S3, preliminarily coating the protective layer slurry on the surface of the polypropylene synthetic paper through the coating roller of the distributing system, and scraping the coated slurry through the scraping unit to evenly distribute the slurry and eliminate pores and local protrusions; S4, the scraper unit monitors the amount of coating slurry and the uniformity of the coating. When too much coating accumulates at the scraper unit, the coating system reduces the amount of coating after receiving feedback. When the coating amount is too much or too little locally, the coating roller is adjusted in time to make the coating uniform, thereby obtaining a uniform slurry layer. S5, the polyethylene synthetic paper after being laid and scraped passes through a drying device under the action of winding, so that the uniform slurry layer is solidified and shaped to obtain an anti-aging protective layer, thereby completing the anti-aging treatment of the polypropylene synthetic paper; The scraper unit comprises a steering roller (1) with a control center, a scraper plate (2) fixedly connected to the bottom of the steering roller (1), and a pre-pressing folding plate (3) fixedly connected to the lower end of the steering roller (1) facing the coating roller, the lower end of the pre-pressing folding plate (3) being in contact with the end surface of the scraper plate (2), and a high-definition camera (4) being fixedly mounted at the lower end of the turning point of the pre-pressing folding plate (3), the shooting end of the high-definition camera (4) facing the connection between the scraper plate (2) and the pre-pressing folding plate (3).

2. The anti-aging treatment method for polypropylene synthetic paper according to claim 1, characterized in that: The protective layer is one of a polyethylene coating, a polypropylene coating, a polyester coating, an acrylic resin coating, and a silicone coating.

3. The anti-aging treatment method of polypropylene synthetic paper according to claim 1, characterized in that: The pre-pressed folding plate (3) comprises a folding line segment (31) fixedly connected to the steering roller (1), a transition segment (32) attached to the scraper plate (2), and a sensing layer; the lower surface of the sensing layer is higher than the lower end of the scraper plate (2); the two ends of the transition segment (32) are respectively fixedly connected to the folding line segment (31) and the sensing layer; and the upper surface of the slurry on the polypropylene synthetic paper between the coating roller and the scraper unit is lower than the bottom of the sensing layer.

4. The anti-aging treatment method for polypropylene synthetic paper according to claim 3, characterized in that: The sensing layer comprises two reference plates (34) and a plurality of pressure-sensitive plates (33) located between the two reference plates (34); the plurality of pressure-sensitive plates (33) comprise a back plate (331) and an elastic layer (332) fixedly connected to one end of the back plate (331) close to the scraper plate (2); the plurality of back plates (331) are all slidably connected to the transition section (32); two adjacent pressure-sensitive plates (33), the reference plate (34) and the adjacent pressure-sensitive plates (33) are in contact with each other; and the two reference plates (34) and the plurality of pressure-sensitive plates (33) are provided with sensing units in common.

5. The anti-aging treatment method for polypropylene synthetic paper according to claim 4, characterized in that: The outer surfaces of the plurality of pressure-sensitive sheets (33) are covered with a protective film (333), the protective film (333) completely covering the contact point between the reference sheet (34) and the adjacent pressure-sensitive sheet (33), the contact point between two adjacent pressure-sensitive sheets (33), and the contact point between the scraper plate (2) and the pressure-sensitive sheet (33), and the lower end edge of the protective film (333) is fixedly connected to the scraper plate (2).

6. The anti-aging treatment method for polypropylene synthetic paper according to claim 5, characterized in that: The sensing unit comprises a laser transmitter (302) and a laser receiver (303) respectively fixedly embedded in opposite ends of two reference plates (34), and a plurality of pressure-sensing holes (301) bored in the plurality of pressure-sensing plates (33); the plurality of pressure-sensing holes (301), the laser transmitter (302) and the laser receiver (303) are all coaxially arranged.

7. The anti-aging treatment method for polypropylene synthetic paper according to claim 6, characterized in that: A re-test groove (304) is also bored in the pressure-sensitive sheet (33), the re-test groove (304) is located directly below the pressure-sensitive hole (301), and the two are interconnected. A re-sensing unit is also arranged in the re-test groove (304), and the re-sensing unit comprises an electromagnetic sheet (41) fixedly connected to the inner wall of the middle part of the re-test groove (304), a positioning rod (42) fixedly connected to one end of the electromagnetic sheet (41), a moving magnetic column (43) located at the other end of the electromagnetic sheet (41), and a pressure sensor (5) installed at the end of the positioning rod (42).

8. The anti-aging treatment method for polypropylene synthetic paper according to claim 7, characterized in that: The ends of the positioning rod (42) and the moving magnetic column (43) are both located inside the re-inspection groove (304), and the end of the moving magnetic column (43) is a concave arc surface structure, and the end of the pressure sensor (5) is flush with the mouth of the re-inspection groove (304).

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