A processing method for high-barrier BOPP film

Abstract

The present invention discloses a processing method for a high-barrier BOPP film, which relates to the technical field of teaching aids and includes the following steps: Step 1, co-extrude a barrier film through an extruder; Step 2, shear the co-extruded barrier film through a shearing machine, and guide the sheared barrier film to a longitudinal film-winding roller for feeding; Step 3, feed the barrier film through multiple groups of longitudinal film-winding rollers, and heat the barrier film during the feeding process of the longitudinal film-winding rollers. The connecting block drives the connecting head to rotate together, the connecting head drives the loading rod to rotate together, and the loading rod drives the eccentric wheel to rotate together. During the rotation of the eccentric wheel, the shaking sleeve on the outside of the loading rod is intermittently lifted and lowered, so that the barrier film is loosened during the stretching process, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the force on the barrier film is more uniform during the stretching process.

Description

Technical Field

[0001] The present invention relates to the technical field of teaching tools, in particular to a processing method of a high-barrier BOPP film. Background Art

[0002] With the rapid development of industries such as packaging, electronics, and medical, the demand for film materials is increasing. Film materials have been widely used in many fields due to their lightness, transparency, and barrier properties.

[0003] During the film stretching process, as the film stretches, it folds and overlaps under the tensile force. The folded films are stacked together, increasing their thickness, affecting the uniformity of the non-overlapping and overlapping parts of the film, causing distortion. Therefore, we propose a processing method for high-barrier BOPP film to solve the above technical problems. Summary of the Invention

[0004] In view of this, the main purpose of the present invention is to provide a method for processing a high-barrier BOPP film, which is used to solve the above-mentioned problems.

[0005] To achieve the above object, the present invention adopts the following technical solution: comprising the following steps:

[0006] Step 1: co-extruding a barrier film through an extruder;

[0007] Step 2: Shearing the co-extruded barrier film by a shearing machine, and guiding the sheared barrier film to a longitudinal film winding roller for feeding;

[0008] Step 3: feeding the barrier film through multiple sets of longitudinal film-winding rollers, and heating the barrier film during the feeding process;

[0009] Step 4: By setting the speed ratio of the longitudinal film winding roller, the barrier film is stretched longitudinally by being fed by the longitudinal film winding roller;

[0010] Step 5: During the longitudinal stretching of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a longitudinal shaking device;

[0011] Step 6: The barrier film is then stretched transversely by a transverse film winding roller, and the barrier film is heated again during the transverse stretching process;

[0012] Step 7: By setting the speed ratio of the transverse film winding roller, the barrier film is stretched transversely when being fed by the transverse film winding roller;

[0013] Step 8: During the transverse stretching process of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a transverse shaking device;

[0014] Step 9: Cut the film after being stretched horizontally and longitudinally.

[0015] As a preferred solution, in step 1, the barrier film includes an outer barrier layer, a first reinforcement layer, a core layer, a second reinforcement layer and an inner barrier layer;

[0016] The outer barrier layer is made of polypropylene and an anti-sticking agent, and has a thickness of 0.8 to 1.1 microns;

[0017] The first reinforcement layer and the second reinforcement layer are both made of polypropylene, and the thickness of both is 0.8 to 1.1 microns;

[0018] The core layer is made of polypropylene;

[0019] The inner barrier layer is made of polypropylene and vinyl elastomer, with the content of vinyl elastomer accounting for 48 percent. The thickness of the inner barrier layer is 1.2 to 1.7 microns.

[0020] As a preferred solution, in the step 2, one end of the barrier film is pulled and rolled up by a winder;

[0021] The motor output end of the winder is provided with a reducer, which is connected to the winding roller on the winder. The reducer can drive the winding roller to rotate and adjust the speed of the winding roller to avoid a large speed difference in the rotation of the winding roller.

[0022] As a preferred embodiment, in step 3 and step 4, multiple groups of longitudinal film-winding rollers are provided, and the rotation speed ratio of two adjacent groups of longitudinal film-winding rollers is 1:1.7. The multiple groups of longitudinal film-winding rollers are staggered in an upper and lower manner to form a tension on the barrier film, and the barrier film passes through the bottom and top ends of the two adjacent groups of longitudinal film-winding rollers in sequence;

[0023] In the step three, when the barrier film is longitudinally stretched, the heating temperature of the barrier film is between 115 degrees Celsius and 119 degrees Celsius, preferably 117 degrees Celsius.

[0024] As a preferred solution, in step five, the connecting block is driven to rotate by a motor, the connecting block drives the connecting head to rotate together, the connecting head drives the loading rod to rotate together, and the loading rod drives the eccentric wheel to rotate together. During the rotation of the eccentric wheel, the shaking sleeve on the outside of the loading rod is intermittently lifted and lowered, thereby loosening the barrier film during the stretching process, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the barrier film is subjected to more uniform force during the stretching process.

[0025] As a preferred embodiment, in step 6 and step 7, multiple groups of transverse film-winding rollers are provided, and the rotational speed ratio of two adjacent groups of transverse film-winding rollers is 1:1.2. The multiple groups of transverse film-winding rollers are staggered in an upper and lower manner to form tension on the barrier film, and the barrier film passes through the bottom and top ends of the two adjacent groups of transverse film-winding rollers in sequence;

[0026] In the step six, when the barrier film is stretched in the transverse direction, the heating temperature of the barrier film is between 110 degrees Celsius and 119 degrees Celsius, preferably 112 degrees Celsius.

[0027] As a preferred solution, in step eight, the transverse shaking device and the longitudinal shaking device have the same structure, and the transverse shaking device and the longitudinal shaking device are arranged vertically.

[0028] During the production process, the longitudinal shaking device is used to apply shaking and vibration perpendicular to the stretching direction when the barrier film is stretched longitudinally. This shaking helps to eliminate stress in the film, prevent wrinkles or tears, and improve the uniformity and quality of the barrier film. The transverse shaking device is used when the barrier film is stretched transversely. Its function is to apply shaking and vibration perpendicular to the stretching direction to the barrier film. This shaking perpendicular to the stretching direction can further help eliminate stress in the film and ensure that the barrier film maintains a uniform stretching effect during the transverse stretching process.

[0029] The two devices are positioned vertically, ensuring that the barrier film can be effectively stress-relieved and uniformly controlled when stretched in both directions. This vertically arranged shaking device can comprehensively improve the overall performance of the barrier film, giving it better physical and mechanical properties after stretching.

[0030] As a preferred solution, in step nine, the transverse edges of the barrier film are sheared to remove portions with uneven thickness and deformed portions of the barrier film;

[0031] The longitudinal length of the barrier film is cut according to the set length of the product.

[0032] As a preferred solution, the longitudinal shaking device includes a loading rod, a plug-in hole is formed through the loading rod, arc grooves are evenly formed on the loading rod, the plug-in hole is connected to the arc groove, an eccentric wheel is provided on the inner side of the arc groove, a plug-in shaft is inserted into the inner side of the plug-in hole, the eccentric wheel is fixed to the inner side of the arc groove through the plug-in shaft, a shaking sleeve is provided on the outer side of the loading rod, ball grooves are evenly formed on the shaking sleeve, a cylindrical groove is formed on the shaking sleeve and located in the middle of the ball groove, a spring rod is fixedly installed on the inner side of the cylindrical groove, and a ball that cooperates with the spring rod is movably provided on the inner side of the ball groove;

[0033] Both ends of the loading rod are fixed with connecting heads, and the connecting heads are sequentially provided with fixing holes and connecting grooves, the connecting grooves are connected with the fixing holes, and the inner side of the connecting grooves is clamped with connecting blocks, and limited width seats are fixedly provided on the loading rod and on both sides of the rocking sleeve, and the width limiting seats are provided with pin holes, and the pin holes pass through the loading rod.

[0034] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0035] This device is used to load the plug-in hole through the loading rod, and can drive the plug-in hole to rock at irregular intervals on the outside of the loading rod 1, thereby preventing the barrier film from folding and overlapping during the stretching process; the plug-in hole opened through the loading rod is used to load the plug-in shaft and cooperates with the arc groove to load the eccentric wheel; the arc groove evenly opened on the loading rod is used to load and limit the eccentric wheel; the arc groove is an arc-shaped notch that can have a good fit with the eccentric wheel; the eccentric wheel arranged on the inner side of the arc groove drives the rocking sleeve to rock and vibrate when the loading rod rotates, thereby ensuring the loosening effect of the barrier film when it is stretched, and the plug-in hole is inserted through the inner side of the plug-in hole The connected plug-in shaft is used to limit the eccentric wheel, and the shaking sleeve provided on the outside of the loading rod causes the barrier film to shake and vibrate during the stretching process of the barrier film, so as to improve the stretching efficiency of the barrier film. On the other hand, it can loosen the folding overlap generated during the stretching process of the barrier film. The ball grooves evenly provided on the shaking sleeve are used to load the balls. The radius of the balls is smaller than the radius of the ball grooves, and after the balls are embedded in the inner side of the ball grooves, the spring rods can make the ball grooves slightly leak out to the outside of the balls to contact the barrier film being stretched, and as the barrier film moves, the barrier film drives the balls to rotate, thereby ensuring the loosening effect of the balls on the barrier film.

[0036] The cylindrical groove provided in the middle of the ball groove is used to load the spring rod by shaking the sleeve. The spring rod fixedly installed inside the cylindrical groove is used to lift the ball so that a portion of the edge of the ball is always exposed outside the ball groove. The ball matched with the spring rod is movably provided inside the ball groove to contact the barrier film and prevent the barrier film from folding and overlapping during the stretching process.

[0037] The motor drives the connecting block to rotate, the connecting block drives the connecting head to rotate together, the connecting head drives the loading rod to rotate together, and the loading rod drives the eccentric wheel to rotate together. During the rotation of the eccentric wheel, the shaking sleeve on the outside of the loading rod is intermittently lifted and lowered, thereby loosening the barrier film during the stretching process, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the barrier film is subjected to more uniform force during the stretching process.

[0038] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 1 is a schematic flow chart of a processing method according to an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the structure of a high barrier BOPP film according to an embodiment of the present invention;

[0041] Figure 3 2. It is a schematic structural diagram of a rocking sleeve according to an embodiment of the present invention;

[0042] Figure 4 2 is a schematic diagram of the loading rod structure of an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of the eccentric wheel structure of an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of the ball structure of an embodiment of the present invention.

[0045] Explanation of the accompanying drawings: 1. Loading rod; 2. Plug-in hole; 3. Connecting head; 4. Fixing hole; 5. Connecting block; 6. Width-limiting seat; 7. Pin hole; 8. Arc groove; 9. Eccentric wheel; 10. Plug-in shaft; 11. Connecting groove; 12. Rocking sleeve; 13. Ball groove; 14. Cylindrical groove; 15. Spring rod; 16. Ball; 17. Outer barrier layer; 18. First reinforcement layer; 19. Core layer; 20. Second reinforcement layer; 21. Inner barrier layer. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0048] See also Figures 1 to 5 The embodiment of the present invention provides a method for processing a high-barrier BOPP film, comprising the following steps:

[0049] Step 1: co-extruding a barrier film through an extruder;

[0050] Step 2: Shearing the co-extruded barrier film by a shearing machine, and guiding the sheared barrier film to a longitudinal film winding roller for feeding;

[0051] Step 3: feeding the barrier film through multiple sets of longitudinal film-winding rollers, and heating the barrier film during the feeding process;

[0052] Step 4: By setting the speed ratio of the longitudinal film winding roller, the barrier film is stretched longitudinally by being fed by the longitudinal film winding roller;

[0053] Step 5: During the longitudinal stretching of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a longitudinal shaking device;

[0054] Step 6: The barrier film is then stretched transversely by a transverse film winding roller, and the barrier film is heated again during the transverse stretching process;

[0055] Step 7: By setting the speed ratio of the transverse film winding roller, the barrier film is stretched transversely when being fed by the transverse film winding roller;

[0056] Step 8: During the transverse stretching process of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a transverse shaking device;

[0057] Step 9: Cut the film after being stretched horizontally and longitudinally.

[0058] Specifically, step one: co-extruding the barrier film through an extruder. In this step, resins of different materials are melted using an extruder and then co-extruded to form a multi-layer barrier film. This multi-layer structure helps improve the performance of the barrier film.

[0059] Step 2: The co-extruded barrier film is sheared by a shearing machine and fed to the longitudinal film winding roller. The shearing machine is used to cut off the waste on both sides of the co-extruded barrier film to ensure that the width of the barrier film is consistent. The sheared barrier film is then fed to the longitudinal film winding roller in preparation for the next step of feeding and stretching.

[0060] Step 3: The barrier film is fed through multiple sets of longitudinal film winding rollers and heated during the feeding process. The multiple sets of longitudinal film winding rollers are responsible for conveying the barrier film in the longitudinal direction. During this process, the barrier film is heated to increase its flexibility and facilitate subsequent stretching operations.

[0061] Step 4: By setting the speed ratio of the longitudinal film winding roller, the barrier film is stretched longitudinally by the longitudinal film winding roller. By adjusting the speed ratio of the longitudinal film winding roller, the barrier film is subjected to tensile force during the conveying process, achieving longitudinal stretching, which helps to improve the strength and toughness of the barrier film.

[0062] Step 5: During the longitudinal stretching process of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a longitudinal shaking device. The function of the longitudinal shaking device is to shake and vibrate the barrier film in the vertical direction during the longitudinal stretching process, which helps to eliminate the stress in the film and improve the uniformity and performance of the barrier film.

[0063] Step 6: The barrier film is then stretched transversely by a transverse film-winding roller, and the barrier film is heated again during the transverse stretching process. The transverse film-winding roller is responsible for conveying and stretching the barrier film in the transverse direction. In this process, the barrier film is heated again, which helps to further improve its flexibility and tensile properties.

[0064] Step 7: By setting the speed ratio of the transverse film winding roller, the barrier film is stretched transversely as it is fed by the transverse film winding roller. By adjusting the speed ratio of the transverse film winding roller, the barrier film is subjected to transverse tensile force during transportation, achieving transverse stretching. This step helps to improve the widthwise strength and uniformity of the barrier film.

[0065] Step 8: During the transverse stretching process of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a transverse shaking device. The function of the transverse shaking device is to shake and vibrate the barrier film in the vertical direction during the transverse stretching process, which helps to eliminate the stress in the film and improve the uniformity and performance of the barrier film.

[0066] Step 9: Cut the film after transverse and longitudinal stretching. The size and performance of the barrier film after transverse and longitudinal stretching have met the requirements. Finally, the barrier film is cut into the required size by a cutting machine for subsequent use or packaging.

[0067] See also Figures 1 to 5 In step 1, the barrier film includes an outer barrier layer 17, a first reinforcement layer 18, a core layer 19, a second reinforcement layer 20 and an inner barrier layer 21;

[0068] The outer barrier layer 17 is made of polypropylene and anti-adhesive, and has a thickness of 0.8 to 1.1 microns;

[0069] The first reinforcement layer 18 and the second reinforcement layer 20 are both made of polypropylene, and the thickness of both is 0.8 to 1.1 microns;

[0070] The core layer 19 is made of polypropylene;

[0071] The inner barrier layer 21 is made of polypropylene and vinyl elastomer, with the vinyl elastomer accounting for 48%. The thickness of the inner barrier layer 21 is 1.2 to 1.7 microns.

[0072] The combination of multiple layers can make the barrier film as a whole have stronger barrier properties, achieving low oxygen permeability and low water permeability.

[0073] See also Figures 1 to 5 In step 2, one end of the barrier film is pulled by a winder and wound;

[0074] A reducer is provided at the output end of the motor on the winder, which is connected to the winding roller on the winder. The reducer can drive the winding roller to rotate and adjust the speed of the winding roller to avoid a large speed difference in the rotation of the winding roller.

[0075] After the shearing machine completes shearing of the barrier film, the winder begins operation, pulling the starting end or leader of the barrier film to ensure that the barrier film maintains a certain tension during subsequent conveying and prevents slack or accumulation. The winder evenly winds the pulled barrier film onto the winding roller. This process requires precise control to avoid wrinkles, tears, or other defects and ensure the quality of the barrier film. The motor on the winder is the source of driving force. It is connected to the reducer through its output end. The reducer's main function is to reduce the motor speed and increase the torque to meet the low speed and high torque requirements of the winding process. The reducer is directly connected to the winding roller on the winder. The rotation of the reducer drives the winding roller to rotate and realize the winding of the barrier film. The speed of the winding roller can be adjusted by the reducer to match the speed of other equipment on the production line and ensure the coordination of the entire production process. The purpose of speed adjustment is to avoid large speed differences when the winding roller rotates. This prevents problems such as uneven tension, breakage, or excessive stretching of the barrier film due to speed mismatch during the winding process.

[0076] See also Figures 1 to 5 In steps 3 and 4, multiple sets of longitudinal film-winding rollers are provided, and the rotation speed ratio of two adjacent sets of longitudinal film-winding rollers is 1:1.7. The multiple sets of longitudinal film-winding rollers are staggered in an upper and lower manner to form a tension on the barrier film. The barrier film passes through the bottom and top ends of the two adjacent sets of longitudinal film-winding rollers in sequence.

[0077] In step three, when the barrier film is longitudinally stretched, the heating temperature of the barrier film is between 115 degrees Celsius and 119 degrees Celsius, preferably 117 degrees Celsius.

[0078] Multiple sets of longitudinal film-winding rollers are arranged on the production line. Each set of rollers is responsible for stretching and conveying the barrier film to a certain extent. These rollers are usually staggered up and down to ensure that the barrier film is in a tensioned state as it passes through. The rotational speed ratio of two adjacent sets of longitudinal film-winding rollers is 1:1.7. This speed difference is key to stretching the barrier film because it produces a stretching effect as the barrier film passes through the rollers. The barrier film passes through the bottom and top ends of the two adjacent sets of longitudinal film-winding rollers in sequence. This arrangement ensures that the barrier film is continuously stretched during the passage process, thereby achieving the purpose of longitudinal stretching.

[0079] Heating can reduce the viscosity of the barrier film and increase its fluidity, thereby reducing stress concentration and the risk of fracture during stretching. At the same time, appropriate heating also helps to improve the final physical properties of the barrier film.

[0080] See also Figures 1 to 5In step five, the motor drives the connecting block 5 to rotate, and the connecting block 5 drives the connecting head 3 to rotate together, and the connecting head 3 drives the loading rod 1 to rotate together, and the loading rod 1 drives the eccentric wheel 9 to rotate together. During the rotation of the eccentric wheel 9, the rocking sleeve 12 outside the loading rod 1 is intermittently lifted and lowered, thereby loosening the barrier film during the stretching process, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the force on the barrier film is more uniform during the stretching process.

[0081] See also Figures 1 to 5 In steps 6 and 7, multiple sets of transverse film-winding rollers are provided, and the rotation speed ratio of two adjacent sets of transverse film-winding rollers is 1:1.2. The multiple sets of transverse film-winding rollers are staggered in an upper and lower manner to form a tension on the barrier film. The barrier film passes through the bottom and top ends of the two adjacent sets of transverse film-winding rollers in sequence.

[0082] In step six, when the barrier film is stretched in the transverse direction, the heating temperature of the barrier film is between 110 degrees Celsius and 119 degrees Celsius, preferably 112 degrees Celsius.

[0083] See also Figures 1 to 5 In step eight, the horizontal shaking device and the vertical shaking device have the same structure, and the horizontal shaking device and the vertical shaking device are arranged vertically.

[0084] During the production process, the longitudinal shaking device is used to apply shaking and vibration perpendicular to the stretching direction when the barrier film is stretched longitudinally. This shaking helps to eliminate stress in the film, prevent wrinkles or tears, and improve the uniformity and quality of the barrier film. The transverse shaking device is used when the barrier film is stretched transversely. Its function is to apply shaking and vibration perpendicular to the stretching direction to the barrier film. This shaking perpendicular to the stretching direction can further help eliminate stress in the film and ensure that the barrier film maintains a uniform stretching effect during the transverse stretching process.

[0085] The two devices are positioned vertically, ensuring that the barrier film can be effectively stress-relieved and uniformly controlled when stretched in both directions. This vertically arranged shaking device can comprehensively improve the overall performance of the barrier film, giving it better physical and mechanical properties after stretching.

[0086] See also Figures 1 to 5 In step nine, the transverse edges of the barrier film are sheared to remove uneven thickness and deformed portions of the barrier film;

[0087] The longitudinal length of the barrier film is cut according to the set length of the product, usually 20 meters per section.

[0088] See also Figures 1 to 5The longitudinal shaking device includes a loading rod 1, a plug hole 2 is opened through the loading rod 1, and arc grooves 8 are evenly opened on the loading rod 1. The plug hole 2 is connected to the arc groove 8. An eccentric wheel 9 is provided on the inner side of the arc groove 8. A plug shaft 10 is inserted into the inner side of the plug hole 2. The eccentric wheel 9 is fixed to the inner side of the arc groove 8 through the plug shaft 10. A shaking sleeve 12 is provided on the outer side of the loading rod 1. Ball grooves 13 are evenly opened on the shaking sleeve 12. A cylindrical groove 14 is opened on the shaking sleeve 12 and located in the middle of the ball groove 13. A spring rod 15 is fixedly installed on the inner side of the cylindrical groove 14. A ball 16 that cooperates with the spring rod 15 is movably provided on the inner side of the ball groove 13;

[0089] Both ends of the loading rod 1 are fixed with connecting heads 3, and the connecting head 3 is provided with a fixing hole 4 and a connecting groove 11 in sequence. The connecting groove 11 is connected to the fixing hole 4, and a connecting block 5 is clamped on the inner side of the connecting groove 11. A limited width seat 6 is fixed on the loading rod 1 and on both sides of the rocking sleeve 12. A pin hole 7 is provided on the width limiting seat 6, and the pin hole 7 passes through the loading rod 1. During the processing of the barrier film, the loading rod 1 is used to load the plug hole 2, and can drive the plug hole 2 to shake at irregular gaps on the outside of the loading rod 1, thereby preventing the barrier film from folding and overlapping during the stretching process. The plug hole 2 opened through the loading rod 1 is used to load the plug shaft 10 and cooperates with the arc groove 8 to load the eccentric wheel 9. The arc groove 8 evenly opened on the loading rod 1 is used to load and limit the eccentric wheel 9. The arc groove 8 is an arc-shaped groove that can have a good fit with the eccentric wheel 9. The eccentric wheel 9 arranged on the inner side of the arc groove 8 drives the shaking sleeve 12 to shake and vibrate when the loading rod 1 rotates, thereby ensuring the loosening effect of the barrier film when it is stretched. The plug-in shaft 10 is used to limit the eccentric wheel 9, and the shaking sleeve 12 provided on the outside of the loading rod 1 causes the barrier film to shake and vibrate during the stretching process of the barrier film, so as to improve the stretching efficiency of the barrier film. On the other hand, it can loosen the folding overlap generated during the stretching process of the barrier film, and the ball grooves 13 evenly opened on the shaking sleeve 12 are used to load the balls 16. The radius of the balls 16 is smaller than the radius of the ball grooves 13, and the balls 16 can be embedded in the inner side of the ball grooves 13. Then, the spring rod 15 can make the ball grooves 13 slightly leak out to the outside of the balls 16 to contact the barrier film being stretched, and as the barrier film moves, the barrier film will drive the balls 16 to rotate, thereby ensuring the loosening effect of the balls 16 on the barrier film;

[0090] A cylindrical groove 14 provided on the shaking sleeve 12 and located in the middle of the ball groove 13 is used to load the spring rod 15. The spring rod 15 fixedly installed inside the cylindrical groove 14 is used to lift the ball 16 so that a portion of the edge of the ball 16 is always exposed outside the ball groove 13. The ball 16, which is movably provided inside the ball groove 13 and cooperates with the spring rod 15, is used to contact the barrier film and prevent the barrier film from folding and overlapping during the stretching process.

[0091] The connecting head 3 fixedly provided at both ends of the loading rod 1 is used to load the connecting block 5, the fixing hole 4 opened on the connecting head 3 is used to fix the connecting block 5, the connecting groove 11 opened on the connecting head 3 is used to load the connecting block 5, the connecting block 5 clamped on the inner side of the connecting groove 11 is used to receive the connecting head 3 and the motor, the width limiting seat 6 fixedly provided on both sides of the rocking sleeve 12 on the loading rod 1 is used to limit the horizontal movement of the rocking sleeve 12, the width limiting seat 6 is fixed with the pin hole 7 opened on the width limiting seat 6 in conjunction with the pin, the pin is a mature existing technology and is not described in detail in this article;

[0092] The motor drives the connecting block 5 to rotate, and the connecting block 5 drives the connecting head 3 to rotate together, and the connecting head 3 drives the loading rod 1 to rotate together, and the loading rod 1 drives the eccentric wheel 9 to rotate together. During the rotation of the eccentric wheel 9, the rocking sleeve 12 outside the loading rod 1 is intermittently lifted and lowered, thereby loosening the barrier film during the stretching process, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the barrier film is subjected to more uniform force during the stretching process. The motor is a mature existing technology and will not be described in detail in this article.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for processing a high barrier BOPP film, characterized in that: The following steps are involved: Step 1: co-extruding a barrier film through an extruder; Step 2: Shearing the co-extruded barrier film by a shearing machine, and guiding the sheared barrier film to a longitudinal film winding roller for feeding; Step 3: feeding the barrier film through multiple sets of longitudinal film-winding rollers, and heating the barrier film during the feeding process; Step 4: By setting the speed ratio of the longitudinal film winding roller, the barrier film is stretched longitudinally by being fed by the longitudinal film winding roller; Step 5: During the longitudinal stretching process of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a longitudinal shaking device; Step 6: The barrier film is then stretched transversely by a transverse film winding roller, and the barrier film is heated again during the transverse stretching process; Step 7: By setting the speed ratio of the transverse film winding roller, the barrier film is stretched transversely when being fed by the transverse film winding roller; Step 8: During the transverse stretching process of the barrier film, the barrier film is shaken and vibrated in the vertical direction of the stretched film by a transverse shaking device; Step nine, cutting the film after being stretched transversely and longitudinally; In the step 5, the longitudinal shaking device includes a loading rod (1), a plug hole (2) is provided through the loading rod (1), arc grooves (8) are evenly provided on the loading rod (1), the plug hole (2) is connected to the arc groove (8), an eccentric wheel (9) is provided on the inner side of the arc groove (8), a plug shaft (10) is plugged into the inner side of the plug hole (2), and the eccentric wheel (9) is fixed on the loading rod (1) through the plug shaft (10). On the inner side of the arc groove (8), the outer side of the loading rod (1) is provided with a shaking sleeve (12), ball grooves (13) are evenly provided on the shaking sleeve (12), a cylindrical groove (14) is provided on the shaking sleeve (12) and located in the middle of the ball groove (13), a spring rod (15) is fixedly installed on the inner side of the cylindrical groove (14), and a ball (16) that cooperates with the spring rod (15) is movably provided on the inner side of the ball groove (13); Connecting heads (3) are fixedly provided at both ends of the loading rod (1), and fixing holes (4) and connecting grooves (11) are sequentially provided on the connecting heads (3), the connecting grooves (11) are connected to the fixing holes (4), and a connecting block (5) is clamped on the inner side of the connecting grooves (11). Limited width seats (6) are fixedly provided on the loading rod (1) and on both sides of the shaking sleeve (12), and a pin hole (7) is provided on the limited width seat (6), and the pin hole (7) passes through the loading rod (1).

2. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In the step 1, the barrier film comprises an outer barrier layer (17), a first reinforcement layer (18), a core layer (19), a second reinforcement layer (20) and an inner barrier layer (21); The outer barrier layer (17) is made of polypropylene and an anti-sticking agent, and has a thickness of 0.8 to 1.1 microns; The first reinforcement layer (18) and the second reinforcement layer (20) are both made of polypropylene, and both have a thickness of 0.8 to 1.1 microns; The core layer (19) is made of polypropylene; The material of the inner barrier layer (21) is composed of polypropylene and vinyl elastomer, and the content of vinyl elastomer accounts for 48%. The thickness of the inner barrier layer (21) is 1.2 to 1.7 microns.

3. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In the second step, one end of the barrier film is pulled and rolled up by a winder; The motor output end of the winder is provided with a reducer, which is connected to the winding roller on the winder. The reducer can drive the winding roller to rotate and adjust the speed of the winding roller to avoid a large speed difference in the rotation of the winding roller.

4. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In steps 3 and 4, multiple groups of longitudinal film-winding rollers are provided, and the rotational speed ratio of two adjacent groups of longitudinal film-winding rollers is 1:1.

7. The multiple groups of longitudinal film-winding rollers are staggered in an upper and lower manner to form tension on the barrier film, and the barrier film passes through the bottom and top ends of the two adjacent groups of longitudinal film-winding rollers in sequence; In the step three, when the barrier film is longitudinally stretched, the heating temperature of the barrier film is between 115 degrees Celsius and 119 degrees Celsius.

5. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In step five, the motor drives the connecting block (5) to rotate, the connecting block (5) drives the connecting head (3) to rotate together, the connecting head (3) drives the loading rod (1) to rotate together, and the loading rod (1) drives the eccentric wheel (9) to rotate together. During the rotation of the eccentric wheel (9), the rocking sleeve (12) outside the loading rod (1) is intermittently lifted and lowered, thereby loosening the barrier film during the stretching process, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the force applied to the barrier film during the stretching process is more uniform.

6. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In steps 6 and 7, there are multiple sets of transverse film-winding rollers, and the rotation speed ratio of two adjacent sets of transverse film-winding rollers is 1:1.

2. The multiple sets of transverse film-winding rollers are staggered in an upper and lower manner to form a tension on the barrier film. The barrier film passes through the bottom and top ends of the two adjacent sets of transverse film-winding rollers in sequence. In the step six, when the barrier film is stretched in the transverse direction, the heating temperature of the barrier film is between 110 degrees Celsius and 119 degrees Celsius.

7. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In the step eight, the transverse shaking device and the longitudinal shaking device have the same structure, and the transverse shaking device and the longitudinal shaking device are arranged vertically.

8. The method for processing a high barrier BOPP film according to claim 1, characterized in that: In the step nine, the transverse edges of the barrier film are sheared to remove uneven thickness and deformed portions of the barrier film; The longitudinal length of the barrier film is cut according to the set length of the product.

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