High-temperature-resistant BOPP (biaxially-oriented polypropylene) film production process method

Abstract

The invention relates to the technical field of film production, in particular to a high-temperature-resistant BOPP film production process method which comprises a base, a machine body, an adjusting box, a sliding frame, a transmission box, a preheating roller, a guide roller, a stretching mechanism, a control table, a flattening mechanism, an adjusting mechanism and a regulation and control mechanism. A film is unfolded through the flattening mechanism, the film can be effectively prevented from being easily wrinkled due to stress in the conveying process, the film can be conveniently and comprehensively attached to the outer wall of the preheating roller, adjustment of the sliding frame is achieved through the adjusting mechanism, part of the flattening mechanism can be adjusted along with the width of the film, and the flattening efficiency is improved. The two sides of the film are expanded and preheated conveniently, preheating regulation and control over the film are achieved through the regulation and control mechanism, part of the device can adjust the preheating duration of the film according to the width of the film so that the film can be controlled to reach the proper temperature, and the high efficiency, the adjustability and the stability of the device are improved.

Description

Technical Field

[0001] The invention relates to the technical field of film production, in particular to a production process method of a high-temperature resistant BOPP film. Background Art

[0002] Biaxially oriented polypropylene film (BOPP) is generally a multi-layer co-extruded film, which is made by co-extruding polypropylene particles into sheets and then stretching them in both the longitudinal and transverse directions. Due to the orientation of the stretched molecules, this film has good physical stability, mechanical strength, and air tightness, high transparency and gloss, and is tough and wear-resistant. It is a widely used printing film. The general thickness is 20 to 40 μm, and the most widely used is 20 μm. The main disadvantage of biaxially oriented polypropylene film is poor heat sealing, so it is generally used as the outer film of the composite film. For example, after being composited with polyethylene film, the moisture resistance, transparency, strength, stiffness and printability are ideal, and it is suitable for holding dry food.

[0003] In the process of producing high-temperature resistant biaxially oriented polypropylene film, the key process points that affect the heat resistance of biaxially oriented polypropylene film include: control of extrusion temperature and quenching temperature, determination of film stretching temperature, determination of heat setting temperature and determination of longitudinal and transverse stretching ratio. Therefore, optimizing and improving the film preheating treatment in film stretching processing equipment can significantly improve the temperature resistance of the film.

[0004] The existing device mainly preheats the film passing through the outer wall through a preheating roller. The existing technology is similar to a stretching device for BOPP film production. The structure with patent number CN115416272A includes a bracket, a conveying assembly, a tripod, a tension roller and a preheating roller, etc. A conveying assembly for conveying the film is provided on one side of the bracket, and a tripod is fixed on the side of the bracket close to the conveying assembly. Two tension rollers for lateral stretching of the film and a preheating roller for preheating the film are rotatably provided on the tripod. The preheating roller is closer to the conveying assembly than the two pressure rollers, and the preheating roller and the two pressure rollers are distributed in a triangular shape. The film is conveyed along the preheating roller, which will cause the preheating roller to preheat the film. At the same time, the hot air blower blows hot air from the telescopic air outlet pipe to the film, which will further improve the preheating effect of the film and make the film preheated more fully. However, there are still areas that can be optimized in this device.

[0005] The existing device mainly adds a preheating device on the front side of the film stretching area, which makes the film easily wrinkled due to force during transportation, resulting in some films being difficult to fully fit on the outer wall of the preheating roller. Secondly, some devices mainly use multiple stretching operations to produce films of suitable specifications, making it difficult for some flattening mechanisms to adjust with the width of the film, resulting in some films being difficult to effectively preheat on both sides. Finally, some devices mainly fix the guide roller and the preheating roller inside the machine body, and the heat transfer of the preheating roller will decrease with the width of the film, making it difficult for some devices to adjust the preheating time of the film according to the width of the film, resulting in some films being difficult to reach the appropriate temperature, reducing the working efficiency and practicality of the device. Therefore, in order to solve the above problems, a high-temperature resistant BOPP film production process method is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a high-temperature resistant BOPP film production process method to solve the problem that the existing devices in the prior art mentioned in the above background technology mainly add a preheating device on the front side of the film stretching area, which makes the film easily wrinkled due to force during transportation, resulting in some films being difficult to fully fit on the outer wall of the preheating roller. Secondly, some devices mainly use multiple stretching operations to produce films of suitable specifications, making it difficult for some flattening mechanisms to adjust with the width of the film, resulting in some films being difficult to effectively preheat on both sides. Finally, some devices mainly fix the guide roller and the preheating roller inside the machine body, and the heat transfer of the preheating roller will decrease with the width of the film, making it difficult for some devices to adjust the preheating time of the film according to the width of the film, resulting in some films being difficult to reach an appropriate temperature.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature resistant BOPP film production process method, comprising a base, the top of the base is fixedly connected to a body, the bottom middle of the body is fixedly connected to an adjustment box, the lower part of the body is slidably connected to two sets of sliding frames, the inner side of the sliding frame is fixedly connected to a transmission box, a preheating roller is arranged above the sliding frame, the two ends of the preheating roller are movably connected to the middle part of the inner wall of the body, a guide roller is arranged above the preheating roller, a stretching mechanism is arranged on the left side of the guide roller, the stretching mechanism is arranged on the upper left of the body, and a control console is fixedly connected to the right side of the surface of the body;

[0008] A flattening mechanism is provided inside the transmission box, and the flattening mechanism includes a first motor, and the rear side of the first motor is fixedly connected to the left side of the surface of the body. An adjustment mechanism is provided inside the adjustment box, and the adjustment mechanism includes a second motor, and the left side of the second motor is fixedly connected to the middle of the right side of the adjustment box. A regulating mechanism is provided on the upper part of the interior of the body, and the regulating mechanism includes a second symmetrical screw, and the front end of the second symmetrical screw is movably connected to the upper part of the interior of the body.

[0009] Preferably, a transmission worm is fixedly connected to the middle part of the rear side of the first motor, the rear end of the transmission worm passes through the machine body and is movably connected to the inner wall of the machine body, and transmission worm wheels are meshedly connected to both sides of the outer wall of the transmission worm.

[0010] Preferably, a transmission shaft is fixedly connected to the middle left side of the transmission worm gear, the left end of the transmission shaft passes through a transmission box and is movably connected to the inside of the transmission box, and the outer wall of the transmission shaft is located inside the transmission box and is fixedly connected to a first bevel gear.

[0011] Preferably, the first bevel gear is meshedly connected to a second bevel gear on one side close to the sliding frame, a rotating shaft is fixedly connected to the middle portion of the outer side of the second bevel gear, the other end of the rotating shaft passes through the sliding frame and is movably connected to the inner wall of the sliding frame, and a rotating wheel is fixedly connected to the outer wall of the sliding frame located inside the sliding frame.

[0012] Preferably, a flattened thread is fixedly connected to the outer wall of the rotating wheel, and the flattened thread has an outer shape of a thread with one turn.

[0013] Preferably, a movable shaft is fixedly connected to the middle part of the left side of the second motor, the left end of the movable shaft passes through the adjustment box and is fixedly connected to the third bevel gear, the left side of the third bevel gear is meshed with a fourth bevel gear, and the inner wall of the fourth bevel gear is fixedly connected to the middle part of the outer wall of the first symmetrical screw.

[0014] Preferably, both sides of the outer wall of the first symmetrical screw are threadedly connected with adjusting screw sleeves, the upper part of the outer wall of the adjusting screw sleeve passes through the machine body and is fixedly connected to the middle of the bottom of the sliding frame, and the bottom of the machine body is provided with a limiting sliding slot corresponding to the adjusting screw sleeve.

[0015] Preferably, the rear end of the first symmetrical screw passes through the adjustment box and is fixedly connected to the driving wheel, the outer wall of the driving wheel is meshedly connected to the linkage belt, the inner wall of the linkage belt is meshedly connected to the driven wheel, and the rear end of the second symmetrical screw passes through the machine body and is fixedly connected to the front middle part of the driven wheel.

[0016] Preferably, sliding screw sleeves are threadedly connected on both sides of the outer wall of the second symmetrical screw, a traction rod is movably connected to the right side of the outer wall of the sliding screw sleeve, a movable frame is movably connected to the right end of the traction rod, and both ends of the guide roller are movably connected to the inner wall of the movable frame.

[0017] Preferably, both sides of the top of the movable frame are fixedly connected to limiting sliding sleeves, the inner wall of the limiting sliding sleeve is inserted with a limiting frame, and the top of the limiting frame is fixedly connected to the top of the inner wall of the body.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention uses the first motor, transmission worm, transmission worm wheel, transmission shaft, first bevel gear, second bevel gear, rotating shaft, rotating wheel and flattening thread and other structures in the flattening mechanism. The first motor is started through the console to drive the transmission worm to limit rotation, the transmission worm meshes to drive the transmission worm wheel, the transmission shaft and the first bevel gear to rotate synchronously, the first bevel gear meshes to drive the second bevel gear, the rotating shaft, the rotating wheel and the flattening thread to rotate synchronously, so that the outer wall of the flattening thread is regulated to drive the film to unfold to both sides, thereby realizing the unfolding of the film, which can effectively prevent the film from being easily wrinkled due to force during the transportation process, and is convenient for the film to be fully attached to the outer wall of the preheating roller, thereby improving the efficiency and practicality of the device.

[0020] 2. The present invention uses the second motor, movable shaft, third bevel gear, fourth bevel gear, first symmetrical screw and adjusting screw sleeve in the adjustment mechanism. The second motor is started through the console to drive the movable shaft and the third bevel gear to rotate synchronously. The meshing of the third bevel gear drives the fourth bevel gear and the first symmetrical screw to rotate in a limited position. The first symmetrical screw drives the adjusting screw sleeve to slide symmetrically inside the limited sliding gap. The adjusting screw sleeve drives the sliding frame and the transmission box to slide synchronously, thereby realizing the adjustment of the sliding frame, so that the partial flattening mechanism can be adjusted according to the width of the film, which is convenient for preheating both sides of the film, thereby improving the adjustability and practicality of the device.

[0021] 3. The present invention uses the structures of the driving wheel, linkage belt, driven wheel, second symmetrical screw, sliding screw sleeve, traction rod, movable frame, limiting sliding sleeve and limiting frame in the regulating mechanism. The first symmetrical screw drives the driving wheel to move synchronously, the driving wheel meshing drives the linkage belt to rotate, the linkage belt meshing drives the driven wheel to rotate synchronously, the driven wheel drives the second symmetrical screw to rotate in a limited position, the second symmetrical screw drives the sliding screw sleeve to slide symmetrically, the sliding screw sleeve drives one end of the traction rod to slide synchronously, so that the other end of the traction rod drives the movable frame and the guide roller to slide left and right, so that the movable frame drives the limiting sliding sleeve to slide stably along the limiting frame, thereby realizing the preheating regulation of the film, so that some devices can adjust the preheating time of the film according to the width of the film, so as to control the film to reach an appropriate temperature, thereby improving the stability and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front perspective view of the structure of the present invention;

[0023] Figure 2 It is a front cross-sectional perspective view of the structure of the present invention;

[0024] Figure 3 It is a right side sectional stereoscopic view of the partial structure of the machine body and the flattening mechanism of the present invention;

[0025] Figure 4 It is a top-view cross-sectional perspective view of a local structure of the sliding box and the flattening mechanism of the present invention;

[0026] Figure 5 It is a top-view cross-sectional perspective view of a local structure of the regulating box and the regulating mechanism of the present invention;

[0027] Figure 6 It is a left side sectional stereoscopic view of the partial structure of the machine body and the regulating mechanism of the present invention;

[0028] Figure 7 It is a bottom-up sectional stereoscopic view of the partial structure of the machine body and the regulating mechanism of the present invention.

[0029] In the figure: 101, base; 102, machine body; 103, adjustment box; 104, sliding frame; 105, transmission box; 106, preheating roller; 107, guide roller; 108, stretching mechanism; 109, control console; 2, flattening mechanism; 201, first motor; 202, transmission worm; 203, transmission worm wheel; 204, transmission shaft; 205, first bevel gear; 206, second bevel gear; 207, rotating shaft; 208, rotating wheel; 209 , flattening thread; 3, adjusting mechanism; 301, second motor; 302, movable shaft; 303, third bevel gear; 304, fourth bevel gear; 305, first symmetrical screw; 306, adjusting screw sleeve; 4, regulating mechanism; 401, driving wheel; 402, linkage belt; 403, driven wheel; 404, second symmetrical screw; 405, sliding screw sleeve; 406, traction rod; 407, movable frame; 408, limiting sliding sleeve; 409, limiting frame. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-7, an embodiment provided by the present invention:

[0032] A production process method of a high-temperature resistant BOPP film, comprising a base 101, the top of the base 101 is fixedly connected to a body 102, a regulating box 103 is fixedly connected to the middle of the bottom of the body 102, two sets of sliding frames 104 are slidably connected to the lower part of the body 102, a transmission box 105 is fixedly connected to the inner side of the sliding frame 104, a preheating roller 106 is arranged above the sliding frame 104, both ends of the preheating roller 106 are movably connected to the middle of the inner wall of the body 102, a guide roller 107 is arranged above the preheating roller 106, a stretching mechanism 108 is arranged on the left side of the guide roller 107, the stretching mechanism 108 is arranged at the upper left inside the body 102, and a control console 109 is fixedly connected to the right side of the surface of the body 102;

[0033] A flattening mechanism 2 is provided inside the transmission box 105, and the flattening mechanism 2 includes a first motor 201, the rear side of the first motor 201 is fixedly connected to the left side of the surface of the body 102, a transmission worm 202 is fixedly connected to the middle part of the rear side of the first motor 201, the rear end of the transmission worm 202 passes through the body 102 and is movably connected to the inner wall of the body 102, and the transmission worm gear 203 is meshingly connected to the two sides of the outer wall of the transmission worm 202. Through this design, the first motor 201 drives the transmission worm 202 to rotate in a limited position, so that the transmission worm 202 drives the transmission worm gear 203 to rotate synchronously, and a transmission shaft 204 is fixedly connected to the middle part of the left side of the transmission worm gear 203, the left end of the transmission shaft 204 passes through the transmission box 105 and is movably connected to the inside of the transmission box 105, the outer wall of the transmission shaft 204 is located inside the transmission box 105 and is fixedly connected to the first bevel gear 205, and through this design, The transmission worm gear 203 drives the transmission shaft 204 and the first bevel gear 205 to rotate in a limited position. The first bevel gear 205 is meshed with the second bevel gear 206 on the side close to the sliding frame 104. The middle part of the outer side of the second bevel gear 206 is fixedly connected with a rotating shaft 207. The other end of the rotating shaft 207 passes through the sliding frame 104 and is movably connected to the inner wall of the sliding frame 104. The outer wall of the sliding frame 104 is located inside the sliding frame 104 and is fixedly connected with a rotating wheel 208. Through this design, the second bevel gear 206 drives the rotating shaft 207 and the rotating wheel 208 to rotate in a limited position. The outer wall of the rotating wheel 208 is fixedly connected with a flattening thread 209. The outer shape of the flattening thread 209 is a thread with one turn. Through this design, the rotating wheel 208 drives the flattening thread 209 to rotate synchronously, so that the outer wall of the flattening thread 209 is regulated to drive the film to unfold to both sides.

[0034] The adjusting box 103 is provided with an adjusting mechanism 3 inside, and the adjusting mechanism 3 includes a second motor 301, the left side of the second motor 301 is fixedly connected to the middle of the right side of the adjusting box 103, the middle of the left side of the second motor 301 is fixedly connected to a movable shaft 302, the left end of the movable shaft 302 passes through the adjusting box 103 and is fixedly connected to a third bevel gear 303, the left side of the third bevel gear 303 is meshedly connected to a fourth bevel gear 304, and the inner wall of the fourth bevel gear 304 is fixedly connected to the first symmetrical screw 305 The middle part of the outer wall of the machine body 102 is provided with a limiting sliding groove corresponding to the adjusting screw sleeve 306. Through this design, the second motor 301 drives the first symmetrical screw 305 to rotate in a limited position. Adjusting screw sleeves 306 are threadedly connected on both sides of the outer wall of the first symmetrical screw 305. The upper part of the outer wall of the adjusting screw sleeve 306 passes through the machine body 102 and is fixedly connected to the middle of the bottom of the sliding frame 104. A limiting sliding groove corresponding to the adjusting screw sleeve 306 is provided at the bottom of the machine body 102. Through this design, the adjusting screw sleeve 306 drives the sliding frame 104 and the transmission box 105 to slide symmetrically along the limiting sliding groove.

[0035] A regulating mechanism 4 is provided on the upper part of the interior of the machine body 102, and the regulating mechanism 4 includes a second symmetrical screw 404, the front end of the second symmetrical screw 404 is movably connected to the upper part of the interior of the machine body 102, the rear end of the first symmetrical screw 305 passes through the regulating box 103 and is fixedly connected to the driving wheel 401, the outer wall of the driving wheel 401 is meshedly connected to the linkage belt 402, the inner wall of the linkage belt 402 is meshedly connected to the driven wheel 403, the rear end of the second symmetrical screw 404 passes through the machine body 102 and is fixedly connected to the front middle part of the driven wheel 403, through this design, the first symmetrical screw 305 drives the second symmetrical screw 404 to rotate synchronously, so that the regulating mechanism 3 can be linked to the regulating mechanism 4, and the outer wall of the second symmetrical screw 404 is threaded on both sides. There is a sliding screw sleeve 405, and a traction rod 406 is movably connected to the right side of the outer wall of the sliding screw sleeve 405, and a movable frame 407 is movably connected to the right end of the traction rod 406. The two ends of the guide roller 107 are movably connected to the inner wall of the movable frame 407. Through this design, the sliding screw sleeve 405 drives the movable frame 407 and the guide roller 107 to slide left and right through the traction rod 406, so as to control the control area of ​​the film and the preheating roller 106. The top of the movable frame 407 is fixedly connected with limiting sleeves 408 on both sides, and the inner wall of the limiting sleeve 408 is inserted with a limiting frame 409. The top of the limiting frame 409 is fixedly connected to the top of the inner wall of the body 102. Through this design, the limiting sleeve 408 drives the movable frame 407 and the guide roller 107 to slide stably.

[0036] Working principle: when the film needs to be unfolded, first start the first motor 201 through the control console 109, the first motor 201 drives the transmission worm 202 to limit the rotation, the transmission worm 202 engages to drive the transmission worm wheel 203 to rotate synchronously, the transmission worm wheel 203 drives the transmission shaft 204 to limit the rotation, the transmission shaft 204 drives the first bevel gear 205 to rotate synchronously, the first bevel gear 205 engages to drive the second bevel gear 206 to rotate synchronously, the second bevel gear 206 drives the rotating shaft 207 to limit the rotation, the rotating shaft 207 drives the rotating wheel 208 to rotate synchronously, the rotating wheel 208 drives the flattening thread 209 to rotate synchronously, so that the outer wall of the flattening thread 209 is regulated to drive the film to unfold to both sides, thereby realizing the film unfolding operation.

[0037] When the sliding frame 104 needs to be adjusted, the second motor 301 is first started through the control console 109, and the second motor 301 drives the movable shaft 302 to limit the rotation, and the movable shaft 302 drives the third bevel gear 303 to rotate synchronously, and the third bevel gear 303 engages to drive the fourth bevel gear 304 to rotate, and the rotation of the fourth bevel gear 304 drives the first symmetrical screw 305 to limit the rotation, and the first symmetrical screw 305 drives the adjusting screw sleeve 306 to slide symmetrically inside the limiting sliding gap, and the adjusting screw sleeve 306 drives the sliding frame 104 and the transmission box 105 to slide synchronously, thereby realizing the adjustment operation of the sliding frame 104.

[0038] When it is necessary to preheat and regulate the film, first, the first symmetrical screw 305 drives the driving wheel 401 to rotate synchronously, the driving wheel 401 engages to drive the linkage belt 402 to rotate, the linkage belt 402 engages to drive the driven wheel 403 to rotate synchronously, the driven wheel 403 drives the second symmetrical screw 404 to rotate in a limited position, the second symmetrical screw 404 drives the sliding screw sleeve 405 to slide symmetrically, the sliding screw sleeve 405 drives one end of the traction rod 406 to slide synchronously, so that the other end of the traction rod 406 drives the movable frame 407 and the guide roller 107 to slide left and right, so that the movable frame 407 drives the limiting sliding sleeve 408 to slide stably along the limiting frame 409, thereby realizing the preheating regulation operation of the film, and the operation ends here.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A process for producing a high temperature resistant BOPP film, comprising a base (101), characterized in that: The top of the base (101) is fixedly connected to a body (102); the middle of the bottom of the body (102) is fixedly connected to an adjustment box (103); two sets of sliding frames (104) are slidably connected to the lower part of the body (102); the inner side of the sliding frame (104) is fixedly connected to a transmission box (105); a preheating roller (106) is provided above the sliding frame (104); both ends of the preheating roller (106) are movably connected to the middle part of the inner wall of the body (102); a guide roller (107) is provided above the preheating roller (106); a stretching mechanism (108) is provided on the left side of the guide roller (107); the stretching mechanism (108) is provided at the upper left inside the body (102); and a control console (109) is fixedly connected to the right side of the surface of the body (102); A flattening mechanism (2) is provided inside the transmission box (105), and the flattening mechanism (2) comprises a first motor (201), and the rear side of the first motor (201) is fixedly connected to the left side of the surface of the machine body (102); an adjusting mechanism (3) is provided inside the adjusting box (103), and the adjusting mechanism (3) comprises a second motor (301), and the left side of the second motor (301) is fixedly connected to the middle part of the right side of the adjusting box (103); and a regulating mechanism (4) is provided at the upper part of the inner part of the machine body (102), and the regulating mechanism (4) comprises a second symmetrical screw rod (404), and the front end of the second symmetrical screw rod (404) is movably connected to the upper part of the inner part of the machine body (102).

2. The high temperature resistant BOPP film production process according to claim 1, characterized in that: A transmission worm (202) is fixedly connected to the middle portion of the rear side of the first motor (201); a rear end of the transmission worm (202) passes through the machine body (102) and is movably connected to the inner wall of the machine body (102); and transmission worm wheels (203) are meshingly connected to both sides of the outer wall of the transmission worm (202).

3. The high temperature resistant BOPP film production process according to claim 2, characterized in that: A transmission shaft (204) is fixedly connected to the middle of the left side of the transmission worm wheel (203); the left end of the transmission shaft (204) passes through the transmission box (105) and is movably connected to the inside of the transmission box (105); and the outer wall of the transmission shaft (204) is located inside the transmission box (105) and is fixedly connected to a first bevel gear (205).

4. The high temperature resistant BOPP film production process according to claim 3, characterized in that: The first bevel gear (205) is meshingly connected to a second bevel gear (206) on one side close to the sliding frame (104); a rotating shaft (207) is fixedly connected to the middle portion of the outer side of the second bevel gear (206); the other end of the rotating shaft (207) passes through the sliding frame (104) and is movably connected to the inner wall of the sliding frame (104); and a rotating wheel (208) is fixedly connected to the outer wall of the sliding frame (104) located inside the sliding frame (104).

5. The high temperature resistant BOPP film production process according to claim 4, characterized in that: A flattened thread (209) is fixedly connected to the outer wall of the rotating wheel (208), and the flattened thread (209) has an outer shape of a thread with one turn.

6. The high temperature resistant BOPP film production process according to claim 1, characterized in that: A movable shaft (302) is fixedly connected to the middle part of the left side of the second motor (301); the left end of the movable shaft (302) passes through the adjustment box (103) and is fixedly connected to the third bevel gear (303); the left side of the third bevel gear (303) is meshedly connected to the fourth bevel gear (304); the inner wall of the fourth bevel gear (304) is fixedly connected to the middle part of the outer wall of the first symmetrical screw (305).

7. The high temperature resistant BOPP film production process according to claim 6, characterized in that: The outer wall of the first symmetrical screw rod (305) is threadedly connected with adjusting screw sleeves (306) on both sides. The outer wall of the adjusting screw sleeve (306) passes through the machine body (102) and is fixedly connected to the middle of the bottom of the sliding frame (104). The bottom of the machine body (102) is provided with a limiting sliding slot corresponding to the adjusting screw sleeve (306).

8. The high temperature resistant BOPP film production process according to claim 7, characterized in that: The rear end of the first symmetrical screw rod (305) passes through the adjustment box (103) and is fixedly connected to the driving wheel (401); the outer wall of the driving wheel (401) is meshedly connected to the linkage belt (402); the inner wall of the linkage belt (402) is meshedly connected to the driven wheel (403); and the rear end of the second symmetrical screw rod (404) passes through the machine body (102) and is fixedly connected to the front middle of the driven wheel (403).

9. A high temperature resistant BOPP film production process according to claim 8, characterized in that: The outer walls of the second symmetrical screw rod (404) are threadedly connected with sliding screw sleeves (405) on both sides, the outer wall of the sliding screw sleeve (405) is movably connected with a traction rod (406) on the right side, the right end of the traction rod (406) is movably connected with a movable frame (407), and the two ends of the guide roller (107) are movably connected to the inner wall of the movable frame (407).

10. A high temperature resistant BOPP film production process according to claim 9, characterized in that: The two sides of the top of the movable frame (407) are fixedly connected to limiting sliding sleeves (408), the inner wall of the limiting sliding sleeve (408) is inserted with a limiting frame (409), and the top of the limiting frame (409) is fixedly connected to the top of the inner wall of the body (102).

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