Processing method of high-barrier BOPP (biaxially-oriented polypropylene) film

Abstract

The invention discloses a processing method of a high-barrier BOPP film, and relates to the technical field of teaching aids, and the processing method comprises the following steps: step 1, co-extruding a barrier film through an extruder; 2, shearing the co-extruded barrier film through a shearing machine, and guiding the sheared barrier film to a longitudinal film winding roller for feeding; and 3, the barrier film is fed through the multiple sets of longitudinal film winding rollers, and the barrier film is heated in the feeding process of the longitudinal film winding rollers. A connecting block drives a connector to rotate together, the connector drives a loading rod to rotate together, the loading rod drives an eccentric wheel to rotate together, and a shaking sleeve on the outer side of the loading rod intermittently jacks up and descends in the rotating process of the eccentric wheel, so that the blocking film is loosened in the stretching process of the blocking film; therefore, the barrier film is prevented from being folded and overlapped in the pulling-up process, and it is guaranteed that stress of the barrier film is more uniform in the pulling-up process.

Description

Technical Field

[0001] The 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 packaging, electronics, medical and other industries, the demand for film materials is growing. Film materials have been widely used in many fields due to their lightness, transparency, barrier properties and other characteristics.

[0003] During the film stretching process, as the film stretches, the film folds and overlaps under the tensile force. The folded film is stacked together, which increases its thickness, thereby 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 serves 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 the barrier film through an extruder;

[0007] Step 2: Shearing the coextruded 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 a plurality of sets of longitudinal film-winding rollers, and heating the barrier film during the feeding process of the longitudinal film-winding rollers;

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

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

[0011] Step 6: Then, the barrier film is 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 by feeding through the transverse film-winding roller;

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

[0014] Step nine: cutting the film after being stretched transversely and longitudinally.

[0015] As a preferred embodiment, in the step 1, the barrier film comprises 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 anti-adhesive, 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, and the content of vinyl elastomer accounts for 48%. 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 by a winder and rolled up;

[0021] A speed reducer is provided at the output end of the motor on the winder, and the speed reducer is connected to the winding roller on the winder. The speed 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 solution, in step 3 and step 4, there are multiple groups of longitudinal film-winding rollers, and the rotation speed ratio of two adjacent groups of longitudinal film-winding rollers is 1:1.7, and the multiple groups of longitudinal film-winding rollers are staggered up and down 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;

[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, and preferably the heating temperature is 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 of the barrier film, 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.

[0025] As a preferred solution, in step 6 and step 7, there are multiple groups of transverse film-winding rollers, and the rotation speed ratio of two adjacent groups of transverse film-winding rollers is 1:1.2, and the multiple groups of transverse film-winding rollers are staggered up and down 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, and the preferred heating temperature is 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 to the barrier film perpendicular to the stretching direction when the barrier film is longitudinally stretched. This shaking helps to eliminate the 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 transversely stretched. Its function is also to apply shaking and vibration to the barrier film perpendicular to the stretching direction. This shaking perpendicular to the stretching direction can further help eliminate the stress in the film and ensure that the barrier film can maintain a uniform stretching effect during the transverse stretching process.

[0029] The two devices are arranged vertically, ensuring that the barrier film can be effectively stress-eliminated 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 the step nine, the transverse edge of the barrier film is sheared to remove the uneven thickness and deformed portion 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 comprises a loading rod, a plug-in hole is formed through the loading rod, arc grooves are formed evenly 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 sleeved on the outer side of the loading rod, ball grooves are formed evenly 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 matched with the spring rod is movably provided on the inner side of the ball groove;

[0033] Both ends of the loading rod are fixedly provided with connecting heads, and the connecting heads are provided with fixing holes and connecting grooves in sequence, and the connecting grooves are communicated 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 shaking sleeve, and the limited width 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 it mainly has the following advantages:

[0035] The device is used to load the plug-in hole through the loading rod, and can drive the plug-in hole to shake 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 penetrated 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 groove that can have a good fit with the eccentric wheel; the eccentric wheel arranged on the inner side of the arc groove drives the shaking sleeve to shake and vibrate when the loading rod rotates, thereby ensuring the loosening effect of the barrier film when it is stretched; The plug-in shaft connected is used to limit the eccentric wheel. The shaking sleeve sleeved on the outside of the loading rod causes shaking and vibration of the barrier film 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 opened on the shaking sleeve are used to load the balls. The radius of the balls is smaller than the radius of the ball grooves. 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. 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 opened on the shaking sleeve and located in the middle of the ball groove is used to load the spring rod, and the spring rod fixedly installed on the inner side of the cylindrical groove is used to lift the ball, so that a part of the edge of the ball is always exposed outside the ball groove. The ball matched with the spring rod is movably arranged on the inner side of 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 in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It 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 It is a schematic diagram of the structure of a shaking sleeve according to an embodiment of the present invention;

[0042] Figure 4 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 solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. 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 coextruded 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 a plurality of sets of longitudinal film-winding rollers, and heating the barrier film during the feeding process of the longitudinal film-winding rollers;

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

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

[0054] Step 6: Then, the barrier film is 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 by feeding through the transverse film-winding roller;

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

[0057] Step nine: cutting the film after being stretched transversely and longitudinally.

[0058] Specifically, step 1: co-extrude the barrier film through an extruder. In this step, the resins of different materials are melted by an extruder, and a multi-layer barrier film is formed through co-extrusion technology. This multi-layer structure helps to improve the performance of the barrier film;

[0059] Step 2: The co-extruded barrier film is sheared by a shearing machine, and the sheared barrier film is led to the longitudinal film winding roller for feeding. The function of the shearing machine is 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 guided to the longitudinal film winding roller to prepare for the next step of feeding and stretching;

[0060] Step 3: Feed the barrier film through multiple sets of longitudinal film winding rollers, and heat the barrier film during the feeding process of the longitudinal film winding rollers. 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 improve 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 through the feeding of the longitudinal film winding roller. By adjusting the speed ratio of the longitudinal film winding roller, the barrier film is subjected to a tensile force during the conveying process, and the longitudinal stretching is achieved, which helps to improve the strength and toughness of the barrier film.

[0062] 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. The function of the longitudinal shaking device is to cause the barrier film to shake and vibrate 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 through the feeding of the transverse film winding roller. The speed ratio of the transverse film winding roller is adjusted so that the barrier film is subjected to transverse stretching force during the conveying process to achieve transverse stretching. This step helps to improve the widthwise strength and uniformity of the barrier film.

[0065] Step 8: During the transverse stretching 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 of the barrier film, which helps to eliminate the stress in the film and improve the uniformity and performance of the barrier film.

[0066] Step nine: 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, and the content of the vinyl elastomer accounts for 48%. The thickness of the inner barrier layer 21 is 1.2 to 1.7 microns.

[0072] The combination of multiple layers of film can make the barrier film as a whole have stronger barrier properties and achieve 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 rolled up;

[0074] A speed reducer is provided at the output end of the motor on the winder, and the speed reducer is connected to the winding roller on the winder. The speed 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 the shearing of the barrier film, the winder starts to work, pulling the starting end or the leader of the barrier film to ensure that the barrier film maintains a certain tension during the subsequent conveying process to prevent relaxation or accumulation. The winder evenly winds the pulled barrier film on the winding roller. This process requires precise control to avoid wrinkles, tears or other defects to 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 the output end. The main function of the reducer is to reduce the speed of the motor and increase the torque at the same time to adapt to the low speed and high torque requirements of the winding process. The reducer is directly connected to the winding roller on the winder, and the winding roller is driven to rotate by the rotation of the reducer to realize the winding of the barrier film. The speed of the winding roller can be adjusted by the reducer, so that the speed of other equipment on the production line can be matched to ensure the coordination of the entire production process. The purpose of adjusting the speed is to avoid a large speed difference when the winding roller rotates, so as to prevent the barrier film from being unevenly tensed, broken or overstretched due to speed mismatch during the winding process.

[0076] See also Figures 1 to 5 In step 3 and step 4, there are multiple groups of longitudinal film-winding rollers, 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 up and down 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;

[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, and preferably the heating temperature is 117 degrees Celsius.

[0078] Multiple groups of longitudinal film-winding rollers are arranged on the production line. Each group of rollers is responsible for stretching and conveying the barrier film. These rollers are usually staggered up and down so that the barrier film can be in a tensioned state when passing through. The rotation speed ratio of two adjacent groups of longitudinal film-winding rollers is 1:1.7. This speed difference is the key to stretching the barrier film because it will produce a stretching effect when the barrier film passes through the rollers. The barrier film passes through the bottom and top ends of the two adjacent groups of longitudinal film-winding rollers in turn. This arrangement allows the barrier film to be continuously stretched during the passing process, thereby achieving the purpose of longitudinal stretching;

[0079] Heating can reduce the viscosity of the barrier film and increase its fluidity, thereby reducing the risk of stress concentration and fracture during the stretching process. At the same time, proper heating can also help 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, 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 shaking sleeve 12 outside the loading rod 1 is intermittently lifted and lowered, so that the barrier film is loosened during the stretching process of the barrier film, 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.

[0081] See also Figures 1 to 5 In step six and step seven, there are multiple groups of transverse film-winding rollers, and the rotation 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 up and down 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 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, and the preferred heating temperature is 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 to the barrier film perpendicular to the stretching direction when the barrier film is longitudinally stretched. This shaking helps to eliminate the 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 transversely stretched. Its function is also to apply shaking and vibration to the barrier film perpendicular to the stretching direction. This shaking perpendicular to the stretching direction can further help eliminate the stress in the film and ensure that the barrier film can maintain a uniform stretching effect during the transverse stretching process.

[0085] The two devices are arranged vertically, ensuring that the barrier film can be effectively stress-eliminated 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 edge of the barrier film is sheared to remove the uneven thickness and deformed portion of the barrier film;

[0087] According to the set length of the product, the longitudinal length of the barrier film is cut, 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 formed through the loading rod 1, arc grooves 8 are formed evenly 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, and 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 sleeved on the outer side of the loading rod 1, ball grooves 13 are formed evenly on the shaking sleeve 12, a cylindrical groove 14 is formed 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 cooperating with the spring rod 15 is movably provided on the inner side of the ball groove 13;

[0089] 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 head 3. 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. Limited width seats 6 are fixedly provided on the loading rod 1 and on both sides of the shaking sleeve 12, and pin holes 7 are provided on the limited width seats 6, and the pin holes 7 pass 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 intervals on the outside of the loading rod 1, so as to prevent 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 cooperate 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 and can have a good fit with the eccentric wheel 9. When the loading rod 1 rotates, the eccentric wheel 9 arranged on the inner side of the arc groove 8 drives the shaking sleeve 12 to shake and vibrate, so as to ensure the loosening effect of the barrier film when it is stretched. The plug-in shaft 10 is used to limit the eccentric wheel 9. The shaking sleeve 12 sleeved 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, the folding overlap generated during the stretching process of the barrier film can play a loosening role. 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 rods 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] The cylindrical groove 14 opened on the shaking sleeve 12 and located in the middle of the ball groove 13 is used to load the spring rod 15, and the spring rod 15 fixedly installed inside the cylindrical groove 14 is used to lift the ball 16, so that a part of the edge of the ball 16 is always exposed outside the ball groove 13, and the ball 16 matched with the spring rod 15 is movably arranged inside the ball groove 13 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 provided on the connecting head 3 is used to fix the connecting block 5, the connecting groove 11 provided 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 swaying sleeve 12 on the loading rod 1 is used to limit the horizontal movement of the swaying sleeve 12, the width limiting seat 6 is fixed by the latch hole 7 provided on the width limiting seat 6 in cooperation with the latch, and the latch is a mature prior art and no unnecessary elaboration is made 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, 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 shaking sleeve 12 on the outside of the loading rod 1 is intermittently lifted and lowered, so that the barrier film is loosened during the stretching process of the barrier film, 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. The motor is a mature existing technology and no unnecessary elaboration is made 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 substitutions and improvements made within the principles of the present invention should be included in the protection scope 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 the barrier film through an extruder; Step 2: Shearing the coextruded 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 a plurality of sets of longitudinal film-winding rollers, and heating the barrier film during the feeding process of the longitudinal film-winding rollers; Step 4: by setting the speed ratio of the longitudinal film winding roller, the barrier film is stretched longitudinally by feeding through the longitudinal film winding roller; Step 5: During the process of longitudinally stretching the barrier film, the barrier film is shaken and vibrated in the vertical direction of the film being stretched by a longitudinal shaking device; Step 6: Then, the barrier film is 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 by feeding through the transverse film-winding roller; Step 8: During the process of transversely stretching the barrier film, the barrier film is shaken and vibrated in the vertical direction where the film is stretched by a transverse shaking device; Step nine: cutting the film after being stretched transversely and longitudinally.

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 anti-adhesive, 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 the thickness of both is 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 step 2, one end of the barrier film is pulled by a winder and rolled up; A speed reducer is provided at the output end of the motor on the winder, and the speed reducer is connected to the winding roller on the winder. The speed 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 the step 3 and the step 4, there are multiple groups of longitudinal film-winding rollers, 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 up and down 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; 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, and preferably the heating temperature is 117 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 shaking sleeve (12) on the outside of the loading rod (1) is intermittently lifted and lowered, thereby loosening the barrier film during the stretching process of the barrier film, thereby preventing the barrier film from folding and overlapping during the pulling process, and ensuring that the force on 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 step 6 and step 7, there are multiple groups of transverse film-winding rollers, and the rotation 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 up and down 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 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, and the preferred heating temperature is 112 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 edge of the barrier film is sheared to remove the uneven thickness and deformed portion of the barrier film; The longitudinal length of the barrier film is cut according to the set length of the product.

9. The method for processing a high barrier BOPP film according to claims 1-8, further comprising a longitudinal shaking device, characterized in that: The longitudinal shaking device comprises a loading rod (1), a plug hole (2) is formed through the loading rod (1), arc grooves (8) are evenly formed on the loading rod (1), the plug hole (2) is connected to the arc groove (8), an eccentric wheel (9) is arranged 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 to the arc groove through the plug shaft (10). On the inner side of the groove (8), a shaking sleeve (12) is sleeved on the outer side of the loading rod (1), ball grooves (13) are evenly formed on the shaking sleeve (12), a cylindrical groove (14) is formed 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) matching 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), and 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).

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