A preparation process of PET film

Abstract

The present application discloses a preparation process of a PET film, and relates to the field of moisture permeability detection, wherein the detection device comprises a base, wherein the base is provided with a first clamping rod and a second clamping rod at intervals, wherein the first clamping rod and the second clamping rod are both composed of a fixed block and two clamping blocks, wherein a mounting plate is provided on the base in a vertical direction, wherein the fixed block of the first clamping rod is rotatably connected to the mounting plate, and the fixed block of the second clamping plate is fixedly mounted on the mounting plate, wherein the two clamping blocks are integrally formed on the corresponding fixed blocks, and a clamping groove is formed between the two clamping blocks; the opposite sides of the two clamping blocks are rotatably connected with a pre-tightening plate, and in the initial state, the pre-tightening plate is arranged in an inclined manner, and the pre-tightening plate is inclined from the direction away from the clamping block to the fixed block side, and the corresponding ends of the two pre-tightening plates on the two clamping blocks are abutted. The present application helps to reduce labor costs.

Description

Technical Field

[0001] The present application relates to the field of film moisture permeability detection, and in particular to a preparation process of a PET film. Background Art

[0002] PET film is a packaging film with relatively comprehensive properties. It has good transparency, gloss, good air tightness and fragrance retention.

[0003] The PET film is composed of an outer film, a middle film and an inner film in sequence. During preparation, the outer film, the middle film and the inner film are hot-pressed and bonded together in sequence to obtain a composite PET film.

[0004] Many characteristics of PIT film are closely related to its moisture permeability, so moisture permeability testing is required after the film is prepared. Referring to the Chinese patent with announcement number CN103196810B, entitled A device for detecting moisture permeability of aluminum-coated PET film, the edge of the PET film is clamped into the clamping groove, the tensioning cylinder is rotated, so that the PET film is wound around the tensioning cylinder and is in a tensioned state, and then the water spraying mechanism is used to spray water on the upper surface of the PET film. The humidity sensor is located below the PET film and can detect the humidity of the space below. Finally, the information is transmitted to the computer to analyze the moisture permeability.

[0005] In practice, the two ends of the PET film are clamped into the clamping groove. Since the middle part of the PET film is in a relaxed state, if the inspector loosens his hand to rotate the tensioning cylinder, the PET film may fall off the clamping groove of the tensioning cylinder. Therefore, two staff members are required to cooperate, one for each tensioning cylinder, one hand holding the PET film, and the other hand rotating the tensioning cylinder to achieve the tensioning of the PET film. That is, the current inspection of PET film requires the cooperation of two people, and the labor cost is high. Summary of the invention

[0006] In order to reduce labor costs, the present application provides a preparation process of a PET film.

[0007] The present application provides a PET film preparation process using the following technical solutions:

[0008] A preparation process of a PET film comprises the following steps:

[0009] S1: PET resin, metal aluminum fiber and gum arabic are made into an outer film by a stretching method;

[0010] S2: PET resin, crystal nucleation accelerator and carbon nanotubes are formed into a middle layer film by a stretching method;

[0011] S3: PET resin, zinc oxide and epoxidized soybean oil are used to form an inner film by a casting method;

[0012] S4: coating an adhesive on the outer film, and hot-pressing and bonding the outer film and the middle film to obtain a first composite film;

[0013] S5: coating an adhesive on the inner film, and hot-pressing and bonding the first composite film and the inner film to the inner film to obtain a PET film;

[0014] S6: Using a detection device to detect the moisture permeability of the PET film;

[0015] The detection device includes a base, a first clamping rod and a second clamping rod are arranged on the base at intervals, the first clamping rod and the second clamping rod are both composed of a fixed block and two clamping blocks, the base is provided with a mounting plate in the vertical direction, the fixing block of the first clamping rod is rotatably connected to the mounting plate, and the fixing block of the second clamping rod is fixedly mounted on the mounting plate, the two clamping blocks are integrally formed on the corresponding fixing blocks, and a clamping groove is formed between the two clamping blocks; pre-tightening plates are rotatably connected to the opposite sides of the two clamping blocks, and in an initial state, the pre-tightening plates are inclined, the pre-tightening plates are inclined from the direction away from the clamping block to one side of the fixed block, and the corresponding ends of the two pre-tightening plates on the two clamping blocks abut against each other; a rotating column is rotatably connected to the clamping block, and the number of the rotating columns is the same as the pre-tightening plates And one-to-one correspondence, the end of the pre-tightening plate is fixed on the rotating column, and a pre-tightening gear is also coaxially fixed on the rotating column; a movable groove is opened in the clamping block, and the clamping block is located in the movable groove and is slidably connected with a pre-tightening rack, and the pre-tightening gear is meshed with the pre-tightening rack, and the clamping block is located in the movable groove. The end of the fixed block away from the fixed block is equipped with a compression spring, one end of the compression spring is connected to the inner wall of the movable groove, and the other end of the compression spring is connected to the end of the pre-tightening rack; a rotating handwheel is coaxially fixed on the fixed block of the first clamping rod, and the mounting plate is provided with a limiting assembly for limiting the rotating handwheel; a water spraying mechanism is provided above the base to evenly spray water on the upper surface of the PET film, and a humidity sensor is provided on the lower side of the base for detecting the humidity of the space below the PET film.

[0016] By adopting the above technical scheme, after the PET film is prepared, the moisture permeability thereof is tested by using a detection device, and the PET film is aligned with the clamping grooves of the first clamping rod and the second clamping rod and inserted. During the insertion process, the PET film moves along the inclined direction of the pre-tightening plate. During this process, when the PET film contacts the two relative pre-tightening plates, the two pre-tightening plates will rotate at a small angle to avoid the movement of the PET film until the PET film completely enters the clamping groove, and then the compression spring will push the pre-tightening rack to slide in the direction close to the fixed block, driving the pre-tightening gear to rotate, and the pre-tightening gear drives the pre-tightening plate to rotate and abut, thereby clamping the PET film. At this time, the staff lets go and the PET film is The film will not fall off from the clamping groove; then, the rotating hand wheel is turned to rotate the first clamping rod, so that the PET film can be tensioned. After tensioning, the limit assembly limits the rotating hand wheel, that is, the first clamping rod is limited; the water spraying mechanism sprays water evenly on the upper surface of the PET film, and uses the humidity sensor to detect the humidity on the lower side of the PET film, which is transmitted to the central control through the controller for analysis, that is, analysis of moisture permeability; through the above method, the PET film can be fixed by the pre-tightening plate, that is, there is no need to pull the PET film to prevent the PET film from falling out of the clamping groove. Therefore, in practice, only one staff member is needed to perform the test, which reduces labor costs.

[0017] Preferably, the limit assembly includes a sliding block and a first pawl, the sliding block slides on the mounting plate in a horizontal direction, and the sliding direction of the sliding block is consistent with the length direction of the first clamping rod, and the first pawl is hinged on the sliding block; an inner ratchet is formed on the side of the rotating handwheel close to the sliding block, and the first pawl is engaged with the inner ratchet, and a first spring sheet is also installed on the sliding block, and the end of the first spring sheet abuts against the first pawl.

[0018] By adopting the above technical scheme, when preparing to carry out the moisture permeability test, first slide the sliding block so that the first pawl and the inner ratchet are plugged into engagement, and the rotating handwheel can only rotate in one direction at this time; then insert the PET film into the clamping groove, rotate the rotating handwheel to tension the PET film, and after the tensioning is completed, the staff can directly release their hands, and the rotating handwheel will not rotate in the opposite direction under the action of the first pawl, thereby realizing the limit locking of the rotating handwheel; when the test work is completed, the sliding block slides so that the first pawl is disengaged from the inner ratchet of the rotating handwheel, that is, it contacts the locking limit of the rotating handwheel, and at this time the rotating handwheel can be reversed to unwind the PET film, and then the PET film can be removed.

[0019] Preferably, a receiving groove is provided in the fixing block, the end of the pre-tightening rack is inserted into the receiving groove, the end of the pre-tightening rack is rotatably connected to the first driving wheel, the fixing block is located in the accommodating groove and is rotatably connected to two second driving wheels, the two second driving wheels correspond one to one to the two first driving wheels of the two pre-tightening racks, a driving rod is eccentrically provided on the second driving wheel, an abutting groove is provided on the first driving wheel, the curvature center of the abutting groove is located at the center of the first driving wheel, the bottom wall of the abutting groove is wedge-shaped, the end of the abutting groove away from the second driving wheel is the distal end, and the end of the abutting groove close to the second driving wheel is the proximal end, the driving rod is slidably matched with the abutting groove, and initially In this state, the driving rod is located at the farther end of the abutment groove; the fixed block is located in the accommodating groove and is coaxially connected to a linkage shaft, a linkage gear is coaxially fixed on the linkage shaft, the linkage gear rotates unidirectionally, the linkage gear is located between the two second driving wheels, and the linkage gear is meshed with the second driving wheel for transmission; when the first clamping rod reels the PET film to achieve tensioning, the linkage gear in the first clamping rod fixing block rotates synchronously with the first clamping rod, and when the first clamping rod rotates in the opposite direction to unwind, the linkage gear does not move; a linkage assembly is arranged in the mounting plate, and when the first clamping rod rotates in the opposite direction to unwind, the linkage gear in the second clamping rod fixing block is driven to rotate by the linkage assembly.

[0020] By adopting the above technical solution, when the staff drives the first clamping rod to rotate by rotating the hand wheel, the two second driving wheels are meshed with the linkage gear, and the two second driving wheels and the linkage gear will rotate with the rotation of the first clamping rod, and there will be no relative rotation between the second driving wheel and the linkage gear; when the detection is completed, the staff drives the second clamping rod to reverse by rotating the hand wheel to realize the unwinding of the PET film. At this time, because the linkage gear rotates in one direction, the linkage gear will not rotate with it. Therefore, when the second driving wheel rotates with the first clamping rod, it will move on the linkage gear, that is, it will rotate relative to the linkage gear, that is, the second driving wheel will rotate relative to the first driving wheel, and when the second driving wheel rotates, it will drive the driving rod from the abutment groove of the first driving wheel. When the distal end slides to the proximal end, there is a certain displacement difference in the abutting groove in the horizontal direction. Therefore, when the driving rod slides in the abutting groove, the first driving wheel will slide in the direction away from the second driving wheel, that is, the pre-tightening rack will slide in the direction away from the fixed block, driving the pre-tightening gear to rotate, that is, the pre-tightening plate will rotate. After the pre-tightening plate rotates, the two relative pre-tightening plates will not abut, that is, a certain opening will be opened, and the clamping of the PET film will be released, so that the PET film can be easily taken out from the clamping groove; similarly, when the first clamping rod rotates, the linkage assembly will drive the linkage gear in the fixing block of the second clamping rod to rotate, and the linkage gear will drive the corresponding second driving wheel to rotate. Similarly, the sliding of the pre-tightening rack can also be achieved, and finally the pre-tightening plate is rotated by a certain angle, which is convenient for taking out the PET film.

[0021] Preferably, a mounting groove is provided in the mounting plate, the fixing block extends into the mounting groove, the mounting plate is located in the mounting groove and is fixedly connected to a first fixed shaft, the first fixed shaft extends into the accommodating groove of the first clamping rod fixing block, the end of the first fixed shaft is fixedly connected to a first ring plate, a second pawl is hinged on the first ring plate, a second ratchet is coaxially fixed on the linkage shaft in the first clamping rod fixing block, the second pawl is meshed with the teeth of the second ratchet, a second spring sheet is installed on the first ring plate, and the end of the second spring sheet abuts against the second pawl.

[0022] By adopting the above technical solution, when the first clamping rod rotates to achieve the tensioning of the PET film, the linkage gear will be driven to rotate accordingly. When the first clamping rod is reversed, under the action of the second pawl and the second ratchet, the linkage gear will not rotate. At this time, the second driving wheel will run on the linkage gear, that is, the second driving wheel will rotate relative to the first driving wheel. The sliding of the preloaded rack is achieved through the cooperation of the driving rod and the abutment groove.

[0023] Preferably, the mounting plate is located in the mounting groove and is rotatably connected to a second fixed shaft, the second fixed shaft extends into the accommodating groove of the second clamping rod fixing block, the end of the second fixed shaft is fixedly connected to a second ring plate, a third pawl is hinged on the second ring plate, a third ratchet is also coaxially fixed on the linkage shaft in the second clamping rod fixing block, the third pawl is meshed with the teeth of the third ratchet, a third spring sheet is installed on the second ring plate, the end of the third spring sheet abuts against the third pawl, and the linkage assembly drives the second fixed shaft to rotate.

[0024] By adopting the above technical scheme, when the first clamping rod rotates to achieve the tensioning of the PET film, the linkage assembly drives the second fixed shaft to rotate. At this time, the second ring plate rotates, the third pawl will rotate relative to the third ratchet, and the third ratchet does not rotate; when the first clamping rod is reversed, the linkage assembly drives the second fixed shaft to reverse. At this time, the third pawl drives the third ratchet to rotate, and the third ratchet drives the linkage wheel to rotate, and then drives the second driving wheel to rotate. Through the cooperation of the driving rod and the abutment groove, the sliding of the pre-tightening rack can be achieved; that is, when the first clamping rod is reversed, the pre-tightening plates on the first clamping rod and the second clamping rod will rotate synchronously by a certain angle to facilitate the PET film to be removed.

[0025] Preferably, the linkage assembly includes a first pulley, a second pulley and a belt, the mounting plate is located in a mounting groove and is rotatably connected to a rotating shaft, the first pulley is coaxially fixed on the rotating shaft, the second pulley is coaxially fixed on the second fixed shaft, the belt is wound around the first pulley and the second pulley, a driving tooth is coaxially fixed on the circumference of the first clamping rod fixing block, and the driving tooth is located in the mounting groove, and a driven tooth is also coaxially fixed on the rotating shaft, and the driving tooth is meshed with the driven tooth.

[0026] By adopting the above technical solution, when the first clamping rod rotates, the fixed block drives the active tooth to rotate, the active tooth drives the driven tooth to rotate, and the driven tooth drives the second fixed shaft to rotate through the first pulley, the second pulley and the belt.

[0027] Preferably, the water spraying mechanism is composed of a spray head, a connecting pipe and a water pump, the connecting pipe is connected to the water outlet of the water pump, the spray head is installed at the water outlet of the connecting pipe, and the spray head is located above the PET film.

[0028] By adopting the above technical solution, the water pump is connected to the external water source. When the PET film is fixed on the first clamping rod and the second clamping rod, the water pump is operated so that the nozzle sprays water onto the surface of the PET film.

[0029] Preferably, a water receiving box is provided on the base in a lifting manner, the water receiving box is located below the PET film, the water receiving box is opened upward, and the humidity sensor is installed in the water receiving box.

[0030] By adopting the above technical solution, the water receiving box is initially in a lowered state to avoid the installation and fixation of the PET film. When the PET film is fixed, the water receiving box rises to the bottom of the PET film. After the nozzle sprays water, the water passes through the PET film and falls into the water receiving box to prevent water from scattering on the base.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. Use the pre-tightening plate to clamp and fix the PET film. When the PET film is inserted into the clamping groove, the staff can release their hands and turn the rotating hand wheel to reel and tighten the PET film. During this process, there is no need to pull the two ends of the PET film, that is, only one staff member is needed to complete the inspection work, reducing labor costs;

[0033] 2. With the help of the sliding of the sliding block, the first pawl is engaged with the inner ratchet of the rotating handwheel, so that the unidirectional rotation of the rotating handwheel can be achieved. That is, after the rotating handwheel is rotated to tension the PET film, the rotating handwheel is released and the rotating handwheel will not rotate, thereby achieving the locking limit of the rotating handwheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of the overall structure of the first clamping rod in the embodiment of the present application;

[0036] Figure 3 This is a schematic cross-sectional view of the clamping block in the embodiment of the present application, which mainly reflects the structure of the pre-tightening gear and the pre-tightening rack;

[0037] Figure 4 It is a cross-sectional schematic diagram of a top view of an embodiment of the present application, which mainly reflects the structure of the linkage assembly;

[0038] Figure 5 for Figure 4 A partial enlarged view of middle A;

[0039] Figure 6 It is a partial structural schematic diagram of an embodiment of the present application, mainly showing a schematic diagram of the cooperation between the driving rod and the abutment groove;

[0040] Figure 7 This is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of the second pawl and the second ratchet;

[0041] Figure 8 It is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of the third pawl and the third ratchet.

[0042] Figure numerals: 1, base; 11, humidity sensor; 12, water receiving box; 121, ear plate; 13, driving cylinder; 2, mounting plate; 21, mounting groove; 3, first clamping rod; 4, second clamping rod; 5, fixed block; 51, rotating hand wheel; 511, inner ratchet; 52, accommodating groove; 53, linkage shaft; 54, linkage gear; 55, second ratchet; 56, third ratchet; 57, active tooth; 6, clamping block; 61, clamping groove; 62, preload plate; 63, rotating column; 64, preload gear; 65, movable groove; 66, preload rack; 67, compression spring; 7, limit assembly; 71, sliding block; 711, first spring piece; 72, first ratchet; 8, water spray mechanism; 81, spray head; 82, connecting pipe; 83, water pump; 9, first driving wheel; 91, abutment groove; 911, farther end; 912, closer end; 10, second driving wheel; 101, driving rod; 20, linkage assembly; 201, first pulley; 202, second pulley; 203, belt; 30, first fixed shaft; 301, first ring plate; 302, second ratchet; 303, second spring piece; 40, second fixed shaft; 401, second ring plate; 402, third ratchet; 403, third spring piece; 50, rotating shaft; 501, driven tooth. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-8 This application is described in further detail.

[0044] The embodiment of the present application discloses a process for preparing a PET film.

[0045] Reference Figure 1 , the preparation process of PET film includes the following steps:

[0046] S1: PET resin, metal aluminum fiber and gum arabic are made into an outer film by a stretching method;

[0047] S2: PET resin, crystal nucleation accelerator and carbon nanotubes are formed into a middle layer film by a stretching method;

[0048] S3: PET resin, zinc oxide and epoxidized soybean oil are used to form an inner film by a casting method;

[0049] S4: coating an adhesive on the outer film, and hot-pressing and bonding the outer film and the middle film to obtain a first composite film;

[0050] S5: coating an adhesive on the inner film, and hot-pressing and bonding the first composite film and the inner film to the inner film to obtain a PET film;

[0051] S6: Using a detection device to detect the moisture permeability of the PET film;

[0052] Reference Figure 1 and Figure 2 The detection device includes a base 1, on which a mounting plate 2 is fixedly mounted, the mounting plate 2 is vertically arranged, and a first clamping rod 3 and a second clamping rod 4 are arranged horizontally at intervals on the mounting plate 2, the first clamping rod 3 and the second clamping rod 4 have the same structure, the first clamping rod 3 and the second clamping rod 4 are both fixed by a fixed block 5 and two clamping blocks 6, the fixed block 5 of the first clamping rod 3 is rotatably connected to the mounting plate 2, the fixed block 5 of the second clamping rod 4 is fixedly connected to the mounting plate 2, and the two fixed blocks 5 are both cylindrical. The two clamping blocks 6 are both integrally formed on the side of the fixed block 5 away from the mounting plate 2, the clamping block 6 is semicircular and long, and a clamping groove 61 is formed between the two clamping blocks 6.

[0053] Reference Figure 1 , Figure 2 and Figure 3Since the first clamping rod 3 and the second clamping rod 4 have the same structure, the structure will now be described by taking the first clamping rod 3 as an example. The two clamping blocks 6 of the first clamping rod 3 are rotatably connected to the opposite sides with pre-tightening plates 62, and multiple pre-tightening plates 62 are arranged at intervals on the same clamping block 6 along the length direction of the clamping block 6; multiple rotating columns 63 are rotatably connected to the clamping block 6, the number of rotating columns 63 is the same as the number of pre-tightening plates 62 and corresponds one to one, the end of the pre-tightening plate 62 is fixed to the rotating column 63, and a pre-tightening gear 64 is also coaxially fixed on the rotating part; a movable groove 65 is opened in the clamping block 6, and the pre-tightening gear 64 extends into the movable groove 65. The clamping block 6 is located in the movable groove 65 and is slidably connected with a pre-tightening rack 66. All pre-tightening gears 64 are meshed with the corresponding pre-tightening racks 66. A compression spring 67 is installed at the end of the clamping block 6 located in the movable groove 65 away from the fixed block 5, one end of the compression spring 67 is connected to the inner wall of the movable groove 65, and the other end of the compression spring 67 is connected to the end of the pre-tightening rack 66. In the initial state, the compression spring 67 is in a free state, and the preload plate 62 is in an inclined state. The preload plate 62 is inclined from the direction away from the clamping block 6 to the side close to the fixed block 5, and the corresponding ends of the preload plates 62 on the two clamping blocks 6 are abutted. A rotating hand wheel 51 is coaxially fixed on the fixed block 5 of the first clamping rod 3, and a limiting component 7 for limiting the rotating hand wheel 51 is provided on the mounting plate 2; a water spraying mechanism 8 is provided above the base 1 to evenly spray water on the upper surface of the PET film, and a humidity sensor 11 is provided on the lower side of the base 1 to detect the humidity of the space below the PET film.

[0054] After the PET film is prepared, its moisture permeability is tested using a detection device, and the PET film is aligned with the clamping groove 61 of the first clamping rod 3 and the second clamping rod 4, and inserted. When plugging, the PET film follows the tilt direction of the pre-tightening plate 62, and the two relative pre-tightening plates 62 will gradually open a hole under the movement of the PET film to avoid the movement of the PET film, that is, at this time, the pre-tightening plate 62 rotates slightly, and the pre-tightening gear 64 drives the limit rack to move a small distance until the PET film completely enters the clamping groove 61. At this time, under the action of the compression spring 67, the pre-tightening rack 66 drives the pre-tightening gear 64 to rotate, and the pre-tightening plate 62 is reset. The two relative pre-tightening plates 62 clamp the PET film to fix the PET film. Then the staff turns the rotating hand wheel 51 to rotate the first clamping rod 3, so that the PET film can be tensioned. After tensioning, the limit assembly 7 limits the rotating hand wheel 51 to prevent it from rotating. The water spraying mechanism 8 sprays water onto the upper surface of the PET film, and the humidity sensor 11 detects the humidity of the space below the PET film, and transmits the detection data to the central control, so as to analyze and judge the moisture permeability of the PET film. In the above manner, the PET film is fixed by the pre-tightening plate 62, and there is no need for the staff to hold the film. Therefore, only one staff member is needed to complete the whole process, which reduces the labor cost.

[0055] Reference Figure 1 and Figure 2 The limiting assembly 7 includes a sliding block 71 and a first pawl 72. The sliding block 71 slides on the mounting plate 2 in the horizontal direction. The mounting block is provided with a sliding groove that cooperates with the sliding block 71. The sliding direction of the sliding block 71 is consistent with the length direction of the first clamping rod 3. The first pawl 72 is hinged on the sliding block 71. The rotating hand wheel 51 is the first ratchet. An inner ratchet 511 is formed on the side of the rotating hand wheel 51 close to the sliding block 71. The first pawl 72 is meshed with the inner ratchet 511. A first spring sheet 711 is also installed on the sliding block 71, and the end of the first spring sheet 711 abuts against the first pawl 72. Before winding and tensioning the PET film, first slide the sliding block 71 so that the first ratchet 72 extends into the inner ratchet 511 and meshes with it. At this time, the rotating hand wheel 51 can only rotate in one direction. When the PET film is fixed, the staff rotates the rotating hand wheel 51 to wind and tension the PET film. After the tension is completed, the rotating hand wheel 51 can be directly released. Through the cooperation of the first ratchet 72 and the inner ratchet 511, the rotating hand wheel 51 is limited and locked to prevent it from reversing. When the PET film needs to be removed, the sliding block 71 is slid so that the first ratchet 72 and the inner ratchet 511 are disengaged, the limited lock of the rotating hand wheel 51 is released, and then the rotating hand wheel 51 is rotated in the opposite direction to unwind the PET film, and the PET film can be removed later.

[0056] Reference Figure 4 , Figure 5 and Figure 6 The two fixed blocks 5 have the same structure. One of them is taken as an example for explanation. A receiving groove 52 is opened in the fixed block 5. The end of the preload rack 66 extends into the receiving groove 52, and the ends of the two preload racks 66 are rotatably connected to the first drive wheel 9. The fixed block 5 is located in the receiving groove 52 and is rotatably connected to the second drive wheel 10 through the connecting shaft. The second drive wheel 10 is provided with two corresponding to the number of the first drive wheels 9. The rotation axis directions of the second drive wheel 10 and the corresponding first drive wheel 9 are both horizontal and collinear. A driving rod 101 is fixedly installed on the side of the second driving wheel 10 close to the first driving wheel 9. The driving rod 101 is eccentrically arranged with the second driving wheel 10. An abutting groove 91 is opened on the first driving wheel 9. The abutting groove 91 is arranged in an arc shape, and the curvature center of the abutting groove 91 is located at the center of the circle of the first driving wheel 9. The bottom wall of the abutting groove 91 is a wedge-shaped surface. The end of the abutting groove 91 away from the second driving wheel 10 is a distal end 911, and the end of the abutting groove 91 close to the second driving wheel 10 is a proximal end 912. The driving rod 101 is slidably matched with the abutting groove 91. In the initial state, the driving rod 101 is located at the distal end 911 of the abutting groove 91; a ball (not shown in the figure) is installed on the end of the driving rod 101, and the ball and the abutting groove 91 roll to reduce the friction between the two.

[0057] The fixed block 5 is located in the receiving groove 52 and is coaxially connected to the linkage shaft 53. The rotation axis of the linkage shaft 53 is colinear with the rotation axis of the fixed block 5, that is, they rotate coaxially. A linkage gear 54 is coaxially fixed on the linkage shaft 53. The linkage gear 54 rotates in one direction. The linkage gear 54 is located between the two second drive wheels 10. The second drive wheels 10 are gears. The linkage gear 54 is meshed with the two second drive wheels 10 for transmission. When the first clamping rod 3 rotates to wind and tension the PET film, the linkage gear 54 will rotate synchronously driven by the two second drive wheels 10. When the first clamping rod 3 is reversed to unwind, the linkage gear 54 cannot rotate, and the second drive wheel 10 walks and rotates on the surface of the linkage gear 54. A linkage assembly 20 is arranged in the mounting plate 2. When the first clamping rod 3 is reversed, the fixed block 5 of the first clamping rod 3 drives the linkage gear 54 in the fixed block 5 of the second clamping rod 4 to rotate through the linkage assembly 20.

[0058] When the staff turns the rotating hand wheel 51 to drive the first clamping rod 3 to rotate and reel the PET film, the action in the first clamping rod 3 is as follows: because the two second driving wheels 10 are meshed with the linkage gear 54, the linkage gear 54 will be driven to rotate synchronously. In this case, the second driving wheel 10 and the first driving wheel 9 will not rotate relative to each other; when the detection is completed, the first clamping rod 3 is reversed. Because the linkage gear 54 is a unidirectional rotation, that is, the linkage gear 54 cannot rotate at this time, the second driving wheel 10 will further rotate under the action of the linkage gear 54 while rotating with the first clamping rod 3, that is, the second driving wheel 10 and the first driving wheel 9 will rotate relative to each other. At this time, the second driving wheel 10 The driving rod 101 of the moving wheel 10 will slide from the more distal end 911 to the more proximal end 912 of the abutment groove 91. Due to the principle of wedge-shaped surface matching, the first driving wheel 9 will slide in the horizontal direction, driving the pre-tightening rack 66 to slide, and then driving the pre-tightening gear 64 to rotate, and the pre-tightening plate 62 will rotate toward the fixed block 5, that is, a hole will open between the two relative pre-tightening plates 62, which is convenient for the PET film to escape therefrom; in addition, when the first clamping rod 3 is reversed, the linkage gear 54 in the second clamping rod 4 is driven to rotate through the linkage assembly 20, which will also realize the rotation of the second driving wheel 10, that is, the pre-tightening plate 62 will also rotate a certain angle, which is convenient for the PET film to escape.

[0059] In practice, the preload rack 66 only needs to move a small distance for the PET film to escape therefrom, that is, the drive rod 101 only needs to rotate a small angle relative to the first drive wheel 9 .

[0060] Reference Figure 4 , Figure 5 and Figure 7A mounting groove 21 is provided in the mounting plate 2, and both fixing blocks 5 extend into the mounting groove 21. The mounting plate 2 is located in the mounting groove 21 and is fixedly connected with a first fixing shaft 30, and the first fixing shaft 30 extends into the accommodating groove 52 of the fixing block 5 of the first clamping rod 3. The end of the first fixing shaft 30 is fixedly connected with a first ring plate 301, and a second pawl 302 is hinged on the first ring plate 301. A second ratchet 55 is also coaxially fixed on the linkage shaft 53 in the fixing block 5 of the first clamping rod 3, and the teeth of the second ratchet 55 are located on the inner side, and the second pawl 302 is meshed with the teeth of the second ratchet 55. A second spring piece 303 is also installed on the first ring plate 301, and the end of the second spring piece 303 abuts against the second pawl 302.

[0061] The unidirectional rotation of the linkage gear 54 can be achieved by the cooperation of the second pawl 302 and the second ratchet 55. When the first clamping rod 3 rotates to tighten the PET film, the second ratchet 55 can rotate relative to the second pawl 302, that is, the linkage gear 54 can rotate, and can only rotate in this direction; when the first clamping rod 3 is reversed, the linkage gear cannot rotate.

[0062] Reference Figure 4 , Figure 5 and Figure 8 The mounting plate 2 is located in the mounting groove 21 and is also rotatably connected with a second fixed shaft 40, which extends into the receiving groove 52 of the second clamping rod 4 fixing block 5, and the end of the second fixed shaft 40 is coaxially fixed with a second ring plate 401, and a third pawl 402 is hinged on the second ring plate 401. A third ratchet 56 is coaxially fixed on the linkage shaft 53 in the second clamping rod 4 fixing block 5, and the teeth of the third ratchet 56 are located on the inner side, and the third pawl 402 is meshed with the teeth of the third ratchet 56. A third elastic piece 403 is also installed on the second ring plate 401, and the end of the third elastic piece 403 is in contact with the third pawl 402. Through the cooperation of the third pawl 402 and the third ratchet 56, the unidirectional rotation of the linkage gear 54 in the second clamping rod 4 fixing block 5 can be achieved. The linkage assembly 20 drives the second fixed shaft 40 to rotate. The linkage assembly 20 includes a first pulley 201, a second pulley 202 and a belt 203. The mounting plate 2 is located in the mounting groove 21 and is rotatably connected to the rotating shaft 50. The first pulley 201 is coaxially fixed on the rotating shaft 50, and the second pulley 202 is coaxially fixed on the second fixed shaft 40. The belt 203 is wound around the first pulley 201 and the second pulley 202. A driving tooth 57 is coaxially fixed on the circumferential side of the fixing block 5 of the first clamping rod 3. The driving tooth 57 is located in the mounting groove 21. A driven tooth 501 is also coaxially fixed on the rotating shaft 50, and the driving tooth 57 is meshed with the driven tooth 501.

[0063] When the first clamping rod 3 rotates to perform tensioning, the active tooth 57 and the driven tooth 501 drive the rotating shaft 50 to rotate, and the rotating shaft 50 drives the second fixed shaft 40 to rotate through the first pulley 201, the second pulley 202 and the belt 203. At this time, the third pawl 402 on the second ring plate 401 rotates relative to the third ratchet 56, and the third ratchet 56 does not rotate; when the first clamping rod 3 is reversed, the third pawl 402 on the second ring plate 401 in the fixing block 5 of the second clamping rod 4 is driven to reverse, drive the third ratchet 56 to rotate, and then drive the second driving wheel 10 to rotate. That is, when the first clamping rod 3 is reversed, the preload plates 62 on the two clamping rods will rotate a small angle to facilitate the PET film to escape therefrom.

[0064] Reference Figure 1 The water spray mechanism 8 is composed of a spray head 81, a connecting pipe 82 and a water pump 83. The connecting pipe 82 is connected to the water outlet of the water pump 83. The spray head 81 is installed at the water outlet of the connecting pipe 82. The spray head 81 is located above the PET film. The water pump 83 is connected to an external water source. When the water pump 83 is operated, the spray head 81 sprays water onto the upper surface of the PET film.

[0065] A water receiving box 12 is provided on the base 1 for lifting. The water receiving box 12 is provided with an opening upward. The water receiving box 12 is located on the lower side of the PET film, and the humidity sensor 11 is installed on the upper side of the water receiving box 12. Ear plates 121 are integrally formed on both sides of the water receiving box 12. Two driving cylinders 13 are installed on the base 1. The driving cylinders 13 are provided vertically upward. The piston rods of the driving cylinders 13 are fixedly connected to the corresponding ear plates 121. The driving cylinders 13 are operated and the piston rods are extended and retracted to realize the lifting and lowering of the water receiving box 12. When the PET film is installed, the water receiving box 12 is in a descending state to avoid the PET film. When the PET film is fixed and tensioned, the water receiving box 12 rises to the lower side of the PET film to prevent water from spilling onto the base 1.

[0066] The implementation principle of the preparation process of a PET film in the embodiment of the present application is as follows: the outer film, the middle film and the inner film are hot-pressed and bonded together to form a PET film, which is then tested for moisture permeability using a detection device, and the two ends of the PET film are inserted into the clamping groove 61. The PET film is clamped and fixed under the action of the pre-tightening plate 62 to prevent the PET film from escaping therefrom, and then the rotating hand wheel 51 is rotated to tension the PET film, and then water spraying detection can be performed; when the detection is completed, the rotating hand wheel 51 is rotated in the opposite direction, that is, the first clamping rod 3 is rotated in the opposite direction, and at this time, the second driving rod 101 in the two clamping rods will rotate relative to the first driving rod 101, and the driving rod 101 slides in the abutting groove 91, so that the first driving rod 101 slides in the horizontal direction, that is, the pre-tightening rack 66 slides, driving the pre-tightening plate 62 to rotate a smaller angle, and at this time, a hole will be opened between the two relative pre-tightening plates 62, which is convenient for the PET film to escape therefrom. By the above method, when the PET film is initially fixed, under the action of the pre-tightening plate 62, there is no need for the staff to manually hold the film and then rotate it, that is, only one staff member is needed to complete the inspection operation, thus reducing the labor cost.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A process for preparing a PET film, characterized in that: The steps include: S1: PET resin, metal aluminum fiber and gum arabic are made into an outer film by a stretching method; S2: PET resin, crystal nucleation accelerator and carbon nanotubes are formed into a middle layer film by a stretching method; S3: PET resin, zinc oxide and epoxidized soybean oil are used to form an inner film by a casting method; S4: coating an adhesive on the outer film, and hot-pressing and bonding the outer film and the middle film to obtain a first composite film; S5: coating an adhesive on the inner film, and hot-pressing and bonding the first composite film and the inner film to the inner film to obtain a PET film; S6: Using a detection device to detect the moisture permeability of the PET film; The detection device comprises a base (1), on which a first clamping rod (3) and a second clamping rod (4) are arranged at intervals, the first clamping rod (3) and the second clamping rod (4) both consisting of a fixed block (5) and two clamping blocks (6), a mounting plate (2) is arranged on the base (1) in a vertical direction, the fixed block (5) of the first clamping rod (3) is rotatably connected to the mounting plate (2), the fixed block (5) of the second clamping rod (4) is fixedly mounted on the mounting plate (2), the two clamping blocks (6) are both integrally formed on the corresponding fixed blocks (5), and a clamping groove (61) is formed between the two clamping blocks (6); opposite sides of the two clamping blocks (6) are both rotatably connected to a preload plate ( 62), in the initial state, the pre-tightening plate (62) is inclined, and the pre-tightening plate (62) is inclined from the direction away from the clamping block (6) to the side of the fixed block (5), and the ends of the two corresponding pre-tightening plates (62) on the two clamping blocks (6) are abutted; the clamping block (6) is rotatably connected with a rotating column (63), the number of the rotating columns (63) is the same as that of the pre-tightening plate (62) and corresponds one to one, the end of the pre-tightening plate (62) is fixed on the rotating column (63), and a pre-tightening gear (64) is coaxially fixed on the rotating column (63); a movable groove (65) is opened in the clamping block (6), and the clamping block (6) is slidably connected with a pre-tightening rack (66) in the movable groove (65), The pre-tightening gear (64) is meshed with the pre-tightening rack (66); a compression spring (67) is installed at one end of the clamping block (6) located in the movable groove (65) away from the fixed block (5); one end of the compression spring (67) is connected to the inner wall of the movable groove (65), and the other end of the compression spring (67) is connected to the end of the pre-tightening rack (66); a rotating hand wheel (51) is coaxially fixed on the fixed block (5) of the first clamping rod (3); the mounting plate (2) is provided with a limiting component (7) for limiting the rotating hand wheel (51); a water spraying mechanism (8) is provided above the base (1) to evenly spray water onto the upper surface of the PET film; a humidity sensor is provided on the lower side of the base (1) The device (11) is used to detect the humidity of the space below the PET film; the limit assembly (7) comprises a sliding block (71) and a first ratchet (72); the sliding block (71) slides on the mounting plate (2) in the horizontal direction, and the sliding direction of the sliding block (71) is consistent with the length direction of the first clamping rod (3); the first ratchet (72) is hinged on the sliding block (71); an inner ratchet (511) is formed on the side of the rotating hand wheel (51) close to the sliding block (71), the first ratchet (72) is meshed with the inner ratchet (511), and a first spring sheet (711) is also installed on the sliding block (71), and the end of the first spring sheet (711) is in contact with the first ratchet (72);The fixing block (5) is provided with a receiving groove (52), the end of the pre-tightening rack (66) is inserted into the receiving groove (52), the end of the pre-tightening rack (66) is rotatably connected to a first driving wheel (9), the fixing block (5) is located in the receiving groove (52) and is rotatably connected to two second driving wheels (10), the two second driving wheels (10) correspond one to one to the two first driving wheels (9) of the two pre-tightening racks (66), a driving rod (101) is eccentrically provided on the second driving wheel (10), the first driving wheel (9) is provided with an abutting groove (91), the curvature center of the abutting groove (91) is located at the center of the first driving wheel (9), and the bottom wall of the abutting groove (91) is wedge-shaped. The abutment groove (91) is shaped like a surface, the end of the abutment groove (91) away from the second driving wheel (10) is the more distal end (911), the end of the abutment groove (91) close to the second driving wheel (10) is the more proximal end (912), the driving rod (101) is slidably matched with the abutment groove (91), and in an initial state, the driving rod (101) is located at the more distal end (911) of the abutment groove (91); the fixing block (5) is located in the accommodating groove (52) and is coaxially rotatably connected with a linkage shaft (53), a linkage gear (54) is coaxially fixed on the linkage shaft (53), the linkage gear (54) rotates in one direction, the linkage gear (54) is located between the two second driving wheels (10), and the linkage gear (54) ) is meshed with the second driving wheel (10) for transmission; when the first clamping rod (3) reels the PET film to achieve tension, the linkage gear (54) in the fixing block (5) of the first clamping rod (3) rotates synchronously with the first clamping rod (3); when the first clamping rod (3) rotates in the reverse direction to unwind, the linkage gear (54) remains stationary; a linkage assembly (20) is provided in the mounting plate (2); when the first clamping rod (3) rotates in the reverse direction to unwind, the linkage gear (54) in the fixing block (5) of the second clamping rod (4) is driven to rotate through the linkage assembly (20); a mounting groove (21) is provided in the mounting plate (2), the fixing block (5) extends into the mounting groove (21), and the mounting plate ( 2) A first fixed shaft (30) is fixedly connected in the installation groove (21), the first fixed shaft (30) extends into the receiving groove (52) of the first clamping rod (3) fixing block (5), the end of the first fixed shaft (30) is fixedly connected to a first ring plate (301), a second ratchet (302) is hinged on the first ring plate (301), a second ratchet (55) is coaxially fixed on the linkage shaft (53) in the first clamping rod (3) fixing block (5), the second ratchet (302) is meshed with the teeth of the second ratchet (55), a second spring sheet (303) is installed on the first ring plate (301), and the end of the second spring sheet (303) is in contact with the second ratchet (302). ; 2. A process for preparing a PET film according to claim 1, characterized in that: The mounting plate (2) is located in the mounting groove (21) and is rotatably connected to a second fixed shaft (40); the second fixed shaft (40) extends into the receiving groove (52) of the second clamping rod (4) fixing block (5); the end of the second fixed shaft (40) is fixedly connected to a second ring plate (401); a third pawl (402) is hinged on the second ring plate (401); a third ratchet (56) is coaxially fixed on the linkage shaft (53) in the second clamping rod (4) fixing block (5); the third pawl (402) meshes with the teeth of the third ratchet (56); a third elastic sheet (403) is installed on the second ring plate (401); the end of the third elastic sheet (403) abuts against the third pawl (402); and the linkage assembly (20) drives the second fixed shaft (40) to rotate.

3. A process for preparing a PET film according to claim 2, characterized in that: The linkage assembly (20) comprises a first pulley (201), a second pulley (202) and a belt (203); the mounting plate (2) is located in the mounting groove (21) and is rotatably connected to a rotating shaft (50); the first pulley (201) is coaxially fixed on the rotating shaft (50); the second pulley (202) is coaxially fixed on the second fixed shaft (40); the belt (203) is wound around the first pulley (201) and the second pulley (202); a driving tooth (57) is coaxially fixed on the circumference of the fixing block (5) of the first clamping rod (3); and the driving tooth (57) is located in the mounting groove (21); a driven tooth (501) is coaxially fixed on the rotating shaft (50); and the driving tooth (57) meshes with the driven tooth (501).

4. The process for preparing a PET film according to claim 1, characterized in that: The water spray mechanism (8) is composed of a spray head (81), a connecting pipe (82) and a water pump (83); the connecting pipe (82) is connected to the water outlet of the water pump (83); the spray head (81) is installed at the water outlet of the connecting pipe (82); and the spray head (81) is located above the PET film.

5. The process for preparing a PET film according to claim 1, characterized in that: A water receiving box (12) is provided on the base (1) in a lifting manner. The water receiving box (12) is located below the PET film. The water receiving box (12) is provided with an opening facing upward. The humidity sensor (11) is installed in the water receiving box (12).

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