Straight-line easy-to-tear type liquid packaging sheet and preparation method and equipment of straight-line easy-to-tear type liquid packaging sheet

Abstract

The invention relates to the technical field of easy-to-tear liquid packaging sheets, and discloses a linear easy-to-tear liquid packaging sheet and a preparation method and equipment thereof.The linear easy-to-tear liquid packaging sheet comprises a cutting machine, a cutting knife is fixedly assembled at the top of the cutting machine, and a mounting plate is fixedly assembled at the bottom of the cutting machine; a winding and crushing mechanism is mounted at the top of the mounting plate; the winding and smashing mechanism comprises a winding and smashing assembly, and an adjusting assembly is installed on the outer edge of the winding and smashing assembly. A movable cutter and a winding rod are arranged in a cutting cover, the movable cutter and a static cutter are matched to cut offcut, the offcut is poked on the winding rod, the winding rod rotates to roll the offcut, and the offcut is rolled and cut through a driving motor, so that the use cost and energy are greatly saved; and meanwhile, the problem that existing equipment can only roll the leftover materials and cannot cut up the leftover materials, so that the use of the equipment is relatively single is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of easy-tear liquid packaging sheets, in particular to a linear easy-tear liquid packaging sheet and a preparation method and equipment thereof. Background Art

[0002] Linear tear-away sheet is a packaging material with a predetermined straight tear line. It is widely used in the packaging of food, medicine, daily necessities and other fields, making it easy for consumers to open it quickly. Liquid packaging sheet is a sheet material used for liquid products such as beverages, condiments, daily chemical liquids, etc. The packaging must have good barrier properties, puncture resistance, liquid corrosion resistance and sealing performance.

[0003] Sheet materials need to be trimmed during production. The purpose of trimming is to keep the width of the sheet consistent before winding, so that both sides of the sheet will be neater after winding. Although the existing equipment is capable of winding the edge materials, it cannot shred the edge materials, making the equipment relatively simple to use. If the edge materials need to be shredded, an additional shredding device needs to be purchased, which will occupy the production workshop space. Summary of the Invention

[0004] The present invention provides a linear easy-tear liquid packaging sheet and a preparation method and equipment thereof, which have the advantages of being able to roll up and shred sheet edges and making the sheet easy to tear in a straight line, thereby solving the problems raised by the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a device for preparing a linear easy-tear liquid packaging sheet, comprising a cutting machine, a cutting blade fixedly mounted on the top of the cutting machine, a mounting plate fixedly mounted on the bottom of the cutting machine, and a winding and crushing mechanism mounted on the top of the mounting plate; The coil crushing mechanism includes a coil crushing assembly, and an adjustment assembly is installed on the outer edge of the coil crushing assembly; The winding shredder assembly includes an adjusting shaft, the outer edge of the adjusting shaft is movably sleeved with a shredding cover, the outer edge of the shredding cover is provided with an entrance, the outer wall of the adjusting shaft is fixedly sleeved with a long sleeve, the outer wall of the long sleeve is mounted with a movable cutter and a winding disk, the outer edge of the movable cutter is fixedly equipped with a plurality of winding rods, and the end of the adjusting shaft away from the winding disk is movably sleeved with a connecting shaft; The adjustment component includes an electric telescopic rod, the power output end of the electric telescopic rod is fixedly equipped with an adjustment bracket, the shape of the adjustment bracket is V-shaped, the top of the adjustment bracket is provided with an adjustment slot, and the connecting shaft is slidably connected to the adjustment slot.

[0006] Preferably, the inner wall of the adjusting shaft is slidably connected to a driving shaft, the outer edge of the driving shaft is mounted with a driving motor, and the driving motor is mounted on a mounting plate.

[0007] Preferably, the end of the long sleeve away from the winding disk is fixedly equipped with a blowing blade, a steel plate filter is provided on the right side of the blowing blade, the outer wall of the shredding hood is provided with a plurality of air inlets, and the outer edge of the winding disk is provided with a plurality of front flow slots.

[0008] Preferably, a guide frame is fixedly mounted on the outer wall of the shredding cover, and the guide frame corresponds to the entrance; a stationary cutter is fixedly mounted on the inner wall of the shredding cover, and the stationary cutter corresponds to the entrance.

[0009] Preferably, a retaining ring is fixedly sleeved on the outer wall of the shredding cover, a disassembly cover is movably sleeved on the outer wall of the shredding cover, a rear flow slot is opened on the outer wall of the disassembly cover, and a connecting column is fixedly assembled on the outer wall of the rear flow slot.

[0010] Preferably, a vertical rod is fixedly mounted on the inner wall of the adjustment bracket, a locking rod is movably sleeved on the outer edge of the vertical rod, a locking groove is provided on the top of the locking rod, and the inner wall of the locking groove is slidably connected to the connecting column.

[0011] Preferably, an unlocking groove is provided on the inner wall of the locking groove, and a reinforcing plate is fixedly mounted on the top of the locking rod.

[0012] A linear easy-tear sheet for liquid packaging comprises a surface layer, a middle layer, and a bottom layer arranged in sequence. The surface layer comprises 60%-80% by mass of polyethylene terephthalate and 20%-40% by mass of synthetic plant esters; the middle layer comprises 40%-60% by mass of nylon, 30%-50% by mass of polyethylene, and 10%-20% by mass of cycloolefin copolymer; and the bottom layer comprises 40%-60% by mass of polyethylene, 20%-40% by mass of ethylene-vinyl alcohol copolymer, and 10%-20% by mass of cycloolefin copolymer.

[0013] A method for preparing a linear easy-tear sheet for liquid packaging, comprising the following steps: Step S1: Weighing 70% of polyethylene terephthalate and 30% of synthetic plant ester, 50% of nylon, 30% of polyethylene, and 20% of cyclic olefin copolymer, and 60% of polyethylene, 20% of ethylene-vinyl alcohol copolymer, and 20% of cyclic olefin copolymer, respectively, and then drying all raw materials; Step S2: Evenly mix the weighed polyethylene terephthalate and synthetic plant ester to form the surface layer material; evenly mix nylon, polyethylene and cycloolefin copolymer to form the middle layer material; evenly mix polyethylene, ethylene-vinyl alcohol copolymer and cycloolefin copolymer to form the bottom layer material; Step S3: Set the extruder temperature to 230-245°C for the surface layer extruder, 185-195°C for the middle layer extruder, and 175-185°C for the bottom layer extruder; set the co-extrusion die temperature to 195-205°C; and add the surface layer raw material, middle layer raw material, and bottom layer raw material mixed in S2 into the corresponding extruder hoppers respectively; Step S4: Extruding the surface layer, middle layer, and bottom layer materials simultaneously through a co-extrusion die to form a three-layer structure sheet; Step S5: The extruded sheet is subjected to physical stretching treatment with a stretching ratio of 1.5-2.5:1, a stretching temperature of 60-80°C, and a stretching speed of 1-3 m / min, so that the middle layer material forms an oriented structure along a specific direction to achieve linear tearing performance; Step S6: The temperature of the cooling roller is set to 50-60°C, and the stretched sheet is cooled and shaped by the cooling roller; Step S7: The shaped sheet is inserted into the cutting machine, and then the cutting knife is adjusted to cut the edge of the sheet. The cut sheet edge is wound up by the winding and crushing mechanism; Step S8: The cooled and shaped sheet is rolled into a roll and subjected to quality inspection, including appearance inspection, thickness measurement, barrier performance test, and tearability test.

[0014] The present invention has the following beneficial effects: 1. The linear easy-tear sheet for liquid packaging, and its preparation method and equipment, are characterized by arranging a movable cutter and a winding rod in a shredding cover. The movable cutter cooperates with the stationary cutter to shred the edge material. The edge material is poked on the winding rod, and the winding rod rotates to reel the edge material. The reeling and shredding of the edge material are both performed by a driving motor, which greatly saves use cost and energy. At the same time, it also solves the problem that existing equipment can only reel the edge material but cannot shred the edge material, making the equipment relatively simple to use.

[0015] 2. The linear easy-tear sheet for liquid packaging and its preparation method and equipment drive the adjustment shaft to move by moving the adjustment bracket forward, so that the winding rod corresponds to the inlet, which is now in the winding state. When the winding state changes to the shredding state, the adjustment bracket moves backward, and the adjustment bracket drives the adjustment shaft to move outward, so that the movable cutter corresponds to the inlet, which is now in the winding state, making the adjustment structure of the device simple and the adjustment speed fast.

[0016] 3. The linear easy-tear sheet for liquid packaging, and its preparation method and equipment, can adjust the movement of the bracket. When the bracket moves, it can drive the locking rod to move. The locking rod locks the disassembly cover, making it impossible to open the disassembly cover in the shredding mode, thereby greatly improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure on the right side of the present invention; Figure 2 This is a schematic diagram of the bottom three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the structure of the winding and crushing assembly and the adjusting assembly of the present invention; Figure 4 For the present invention Figure 3 A in the figure shows the enlarged structural diagram; Figure 5 For the present invention Figure 3 A schematic diagram of the structure at point B in FIG. Figure 6 This is a schematic diagram of the structure of the winding and crushing assembly of the present invention; Figure 7 This is a schematic diagram of the structure of the shredding cover of the present invention; Figure 8 It is a schematic diagram of the long sleeve structure of the present invention.

[0018] In the figure: 1. Cutter; 2. Cutter blade; 3. Winding and crushing mechanism; 4. Mounting plate; 31. Winding and crushing assembly; 32. Adjustment assembly; 3101, drive motor; 3102, drive shaft; 3103, adjustment shaft; 3104, connecting shaft; 3105, long sleeve; 3106, movable cutter; 3107, take-up reel; 3108, front flow channel; 3109, winding rod; 3110, blower blade; 3111, steel plate filter; 3112, disassembly cover; 3113, connecting column; 3114, chopping cover; 3115, retaining ring; 3116, air inlet; 3117, air inlet; 3118, stationary cutter; 3119, guide frame; 3120, rear flow channel; 3201, electric telescopic rod; 3202, adjustment bracket; 3203, adjustment slot; 3204, vertical rod; 3205, locking rod; 3206, locking slot; 3207, unlocking slot; 3208, reinforcement plate. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1-8A device for preparing a straight-line easy-tear liquid packaging sheet comprises a cutting machine 1, a cutting blade 2 is fixedly mounted on the top of the cutting machine 1, a mounting plate 4 is fixedly mounted on the bottom of the cutting machine 1, and a winding and crushing mechanism 3 is mounted on the top of the mounting plate 4; In the above structure, the sheet in the cutting machine 1 is cut by the cutting knife 2, and the cut sheet edge material enters the winding and crushing mechanism 3 for winding processing, and the cut sheet edge material enters the winding and crushing mechanism 3 for shredding processing.

[0021] The coil crushing mechanism 3 includes a coil crushing assembly 31 , and an adjustment assembly 32 is installed on the outer edge of the coil crushing assembly 31 ; In the above structure, through the setting of the winding and crushing component 31, the winding and crushing component 31 can reel in the sheet edge material, and can also shred the edge material. The adjustment component 32 can switch the winding function and shredding function on the winding and crushing component 31, and can also lock and unlock the disassembly cover 3112.

[0022] The winding and shredding assembly 31 includes an adjusting shaft 3103, with a shredding cover 3114 movably sleeved on its outer edge. An entrance 3117 is defined on the outer edge of the shredding cover 3114. A long sleeve 3105 is fixedly sleeved on the outer wall of the adjusting shaft 3103. A movable cutter 3106 and a winding reel 3107 are mounted on the outer wall of the long sleeve 3105. Several winding rods 3109 are fixedly mounted on the outer edge of the movable cutter 3106. A connecting shaft 3104 is movably sleeved on the end of the adjusting shaft 3103 away from the winding reel 3107. In the above structure, the scraps enter the shredding cover 3114 through the entrance 3117. When the adjusting shaft 3103 rotates, the movable cutter 3106 can be driven to rotate. At this time, the movable cutter 3106 is tangent to the stationary cutter 3118 during rotation, so that the scraps entering the shredding cover 3114 can be shredded. When the scraps need to be wound up, the adjusting shaft 3103 is moved toward the middle so that the winding rod 3109 will correspond to the entrance 3117. At this time, the scraps can be poked into the winding rod 3109. When the scraps are fixed on the winding rod 3109, the winding and shredding mechanism 3 is in a stopped state. When the scraps are fixed on the winding rod 3109, the winding and shredding mechanism 3 is then started, and the winding disk 3107 rotates to drive the winding rod 3109 to rotate, so that the scraps can be wound on the winding rod 3109.

[0023] The adjustment assembly 32 includes an electric telescopic rod 3201. The power output end of the electric telescopic rod 3201 is fixedly equipped with an adjustment bracket 3202. The adjustment bracket 3202 is V-shaped. The top of the adjustment bracket 3202 is provided with an adjustment slot 3203. The connecting shaft 3104 is slidably connected to the adjustment slot 3203. In the above structure, the electric telescopic rod 3201 is extended to push the adjusting bracket 3202 forward, and the adjusting bracket 3202 moves the connecting shaft 3104 and the adjusting shaft 3103 toward the middle, gradually making the winding rod 3109 correspond to the entrance 3117. The electric telescopic rod 3201 is contracted to drive the adjusting bracket 3202 to move backward, and the adjusting bracket 3202 moves the connecting shaft 3104 and the adjusting shaft 3103 outward, gradually making the movable cutter 3106 correspond to the entrance 3117, so that the device can roll up the cut edge material and also cut the edge material.

[0024] In a preferred embodiment, the inner wall of the adjustment shaft 3103 is slidably connected to the drive shaft 3102 , the outer edge of the drive shaft 3102 is mounted with a drive motor 3101 , and the drive motor 3101 is mounted on the mounting plate 4 ; In the above structure, through the setting of the sliding connection between the adjustment shaft 3103 and the drive shaft 3102, the drive motor 3101 can drive the drive shaft 3102 to rotate during operation, and the drive shaft 3102 can drive the adjustment shaft 3103 to rotate when rotating. At the same time, the adjustment shaft 3103 can also slide on the drive shaft 3102, thereby improving the rationality of the device.

[0025] In a preferred embodiment, a blowing blade 3110 is fixedly mounted on one end of the long sleeve 3105 away from the winding reel 3107. A steel filter 3111 is provided on the right side of the blowing blade 3110. A plurality of air inlets 3116 are provided on the outer wall of the shredding cover 3114. A plurality of front flow slots 3108 are provided on the outer edge of the winding reel 3107. In the above structure, through the setting of the blowing blade 3110, when the adjusting shaft 3103 rotates, the blowing blade 3110 can be driven to rotate, and when the blowing blade 3110 rotates, the shredded fragments can be blown. The wind generated by the rotation of the blowing blade 3110 enters the shredding cover 3114 through the air inlet 3116, causing the fragments to move toward the disassembly cover 3112. A nylon bag is put on the outer wall of the disassembly cover 3112, and the fragments enter the nylon bag through the front flow slot 3108 on the winding disk 3107. The nylon bag plays the role of collecting fragments. Through the setting of the steel plate filter 3111, the steel plate filter 3111 can block the fragments to prevent the fragments from contacting the blowing blade 3110. The wind generated by the blowing blade 3110 can enter the movable cutter 3106 through the blowing blade 3110.

[0026] In a preferred embodiment, a guide frame 3119 is fixedly mounted on the outer wall of the shredding cover 3114, and the guide frame 3119 corresponds to the inlet 3117. A stationary cutter 3118 is fixedly mounted on the inner wall of the shredding cover 3114, and the stationary cutter 3118 corresponds to the inlet 3117. In the above structure, through the setting of the guide frame 3119, the guide frame 3119 plays a role in guiding the scraps. The top opening of the guide frame 3119 is larger than the bottom opening, so that the scraps can easily enter the guide frame 3119 and then enter the entry port 3117, so that the scraps can enter the shredding cover 3114 more quickly. Through the setting of the stationary cutter 3118, when the movable cutter 3106 rotates, it will be tangent to the stationary cutter 3118, so that the scraps can be chopped.

[0027] In a preferred embodiment, a retaining ring 3115 is fixedly sleeved on the outer wall of the shredding cover 3114, a disassembly cover 3112 is movably sleeved on the outer wall of the shredding cover 3114, a rear flow slot 3120 is formed on the outer wall of the disassembly cover 3112, and a connecting column 3113 is fixedly mounted on the outer wall of the rear flow slot 3120; In the above structure, through the setting of the retaining ring 3115, the retaining ring 3115 can limit the disassembly cover 3112, and the disassembly cover 3112 is put on the shredding cover 3114. A nylon bag is put on the disassembly cover 3112, so the fragments in the shredding cover 3114 are blown by the blowing blades 3110 and enter the nylon bag through the disassembly cover 3112. When the fragments in the nylon bag are full, the disassembly cover 3112 is removed, and then the nylon bag is removed and replaced with a new nylon bag.

[0028] In a preferred embodiment, a vertical rod 3204 is fixedly mounted on the inner wall of the adjustment bracket 3202, a locking rod 3205 is movably sleeved on the outer edge of the vertical rod 3204, a locking groove 3206 is formed on the top of the locking rod 3205, and the inner wall of the locking groove 3206 is slidably connected to the connecting column 3113; In the above structure, through the setting of the locking rod 3205, when the electric telescopic rod 3201 is in the retracted state, the disassembly cover 3112 is locked by the locking rod 3205, so that the disassembly cover 3112 cannot be separated from the shredding cover 3114. When the electric telescopic rod 3201 is in the extended state, the adjustment bracket 3202 moves, the locking rod 3205 rotates on the adjustment bracket 3202, and the connecting column 3113 is not located at the tail end of the locking groove 3206, so that the disassembly cover 3112 can move.

[0029] In a preferred embodiment: an unlocking groove 3207 is provided on the inner wall of the locking groove 3206, and a reinforcing plate 3208 is fixedly mounted on the top of the locking rod 3205; In the above structure, through the setting of the unlocking slot 3207, when the disassembly cover 3112 can be moved, the disassembly cover 3112 is then pulled backward so that the disassembly cover 3112 can be separated from the shredding cover 3114, and then the connecting column 3113 on the disassembly cover 3112 is moved out of the locking slot 3206 from the unlocking slot 3207, so that the disassembly cover 3112 can be removed from the locking rod 3205.

[0030] A linear easy-tear sheet for liquid packaging includes a surface layer, a middle layer, and a bottom layer arranged in sequence. The surface layer includes 60%-80% by mass of polyethylene terephthalate and 20%-40% by mass of synthetic plant esters. The middle layer includes 40%-60% by mass of nylon, 30%-50% by mass of polyethylene, and 10%-20% by mass of cycloolefin copolymer. The bottom layer includes 40%-60% by mass of polyethylene, 20%-40% by mass of ethylene-vinyl alcohol copolymer, and 10%-20% by mass of cycloolefin copolymer.

[0031] A method for preparing a linear easy-tear sheet for liquid packaging, comprising the following steps: Step S1: Weighing 70% of polyethylene terephthalate and 30% of synthetic plant ester, 50% of nylon, 30% of polyethylene, and 20% of cyclic olefin copolymer, and 60% of polyethylene, 20% of ethylene-vinyl alcohol copolymer, and 20% of cyclic olefin copolymer, respectively, and then drying all raw materials; Step S2: Evenly mix the weighed polyethylene terephthalate and synthetic plant ester to form the surface layer material; evenly mix nylon, polyethylene and cycloolefin copolymer to form the middle layer material; evenly mix polyethylene, ethylene-vinyl alcohol copolymer and cycloolefin copolymer to form the bottom layer material; Step S3: Set the extruder temperature to 230-245°C for the surface layer extruder, 185-195°C for the middle layer extruder, and 175-185°C for the bottom layer extruder; set the co-extrusion die temperature to 195-205°C; and add the surface layer raw material, middle layer raw material, and bottom layer raw material mixed in S2 into the corresponding extruder hoppers respectively; Step S4: Extruding the surface layer, middle layer, and bottom layer materials simultaneously through a co-extrusion die to form a three-layer structure sheet; Step S5: The extruded sheet is subjected to physical stretching treatment with a stretching ratio of 1.5-2.5:1, a stretching temperature of 60-80°C, and a stretching speed of 1-3 m / min, so that the middle layer material forms an oriented structure along a specific direction to achieve linear tearing performance; Step S6: The temperature of the cooling roller is set to 50-60°C, and the stretched sheet is cooled and shaped by the cooling roller; Step S7: The shaped sheet is inserted into the cutting machine 1, and then the cutting blade 2 is adjusted to cut the edge of the sheet. The cut sheet edge is wound up by the winding and crushing mechanism 3; Step S8: The cooled and shaped sheet is rolled into a roll and subjected to quality inspection, including appearance inspection, thickness measurement, barrier performance test, and tearability test.

[0032] Working principle: When in use, the head of the sheet material cut by the cutting knife 2 is placed in the guide frame 3119, and then half of the sheet material passes through the inlet 3117, and the drive motor 3101 is started. The drive motor 3101 drives the drive shaft 3102 to rotate, and the drive shaft 3102 rotates to drive the adjustment shaft 3103 to rotate. When the adjustment shaft 3103 rotates, it drives the long sleeve 3105 and the movable cutter 3106 to rotate. When the movable cutter 3106 rotates, it will be tangent to the stationary cutter 3118, so that the sheet material can be chopped. The long sleeve 3105 When rotating, the blowing blade 3110 will also be driven to rotate. When the blowing blade 3110 rotates, the fragments in the inner cavity of the shredding cover 3114 will be blown toward the disassembly cover 3112, so that the fragments enter the nylon bag on the disassembly cover 3112. When the edge material needs to be rolled up, the electric telescopic rod 3201 is extended to push the adjustment bracket 3202 forward, and the bracket 3202 is gradually adjusted to drive the connecting shaft 3104 and the adjustment shaft 3103 toward the middle, so that the winding rod 3109 corresponds to the inlet 3117. At this time, the edge material can be poked on the winding rod 31 09, when the adjusting shaft 3103 is rotating, the winding disc 3107 and the winding rod 3109 are driven to rotate, and the winding rod 3109 can reel in the edge material when rotating. When the winding rod 3109 is full of edge material, the driving motor 3101 is stopped at this time, and then the edge material is cut off, and the edge material roll is pulled off the winding rod 3109, and then the edge material is poked into the winding rod 3109. When the adjusting bracket 3202 is moving, the locking rod 3205 can be driven to move, and the locking rod 3205 moves on the adjusting bracket 3202. 3205 gradually becomes horizontal. At this time, the locking rod 3205 does not lock the disassembly cover 3112, and pulls the disassembly cover 3112 backward. Then, the connecting column 3113 on the disassembly cover 3112 passes through the unlocking slot 3207, so that the disassembly cover 3112 can be removed. When the electric telescopic rod 3201 is in a retracted state, the locking rod 3205 pulls the connecting column 3113, so that the disassembly cover 3112 contacts the retaining ring 3115, and the locking rod 3205 is used to fix the disassembly cover 3112, so that the disassembly cover 3112 cannot be opened when the equipment is crushing.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing a straight-line easy-tear liquid packaging sheet, comprising a cutting machine (1), characterized in that: A cutting knife (2) is fixedly mounted on the top of the cutting machine (1), a mounting plate (4) is fixedly mounted on the bottom of the cutting machine (1), and a winding and crushing mechanism (3) is mounted on the top of the mounting plate (4); The coil crushing mechanism (3) comprises a coil crushing assembly (31), and an adjustment assembly (32) is installed on the outer edge of the coil crushing assembly (31); The winding shredding assembly (31) comprises an adjusting shaft (3103), the outer edge of the adjusting shaft (3103) is movably sleeved with a shredding cover (3114), the outer edge of the shredding cover (3114) is provided with an entrance (3117), the outer wall of the adjusting shaft (3103) is fixedly sleeved with a long sleeve (3105), the outer wall of the long sleeve (3105) is mounted with a movable cutter (3106) and a winding disk (3107), the outer edge of the movable cutter (3106) is fixedly equipped with a plurality of winding rods (3109), and the end of the adjusting shaft (3103) away from the winding disk (3107) is movably sleeved with a connecting shaft (3104); The adjustment assembly (32) comprises an electric telescopic rod (3201), an adjustment bracket (3202) being fixedly mounted on the power output end of the electric telescopic rod (3201), the adjustment bracket (3202) being V-shaped, an adjustment slot (3203) being provided on the top of the adjustment bracket (3202), and the connecting shaft (3104) being slidably connected to the adjustment slot (3203).

2. The linear easy-tear liquid packaging sheet preparation device according to claim 1, characterized in that: The inner wall of the adjustment shaft (3103) is slidably connected to a drive shaft (3102), and the outer edge of the drive shaft (3102) is mounted with a drive motor (3101), and the drive motor (3101) is mounted on a mounting plate (4).

3. The linear easy-tear liquid packaging sheet preparation device according to claim 1, characterized in that: A blowing blade (3110) is fixedly mounted on one end of the long sleeve (3105) away from the winding disk (3107), a steel plate filter (3111) is provided on the right side of the blowing blade (3110), a plurality of air inlets (3116) are provided on the outer wall of the shredding cover (3114), and a plurality of front flow slots (3108) are provided on the outer edge of the winding disk (3107).

4. The linear easy-tear liquid packaging sheet preparation device according to claim 1, characterized in that: The outer wall of the shredding cover (3114) is fixedly equipped with a guide frame (3119), and the guide frame (3119) corresponds to the entrance (3117). The inner wall of the shredding cover (3114) is fixedly equipped with a stationary cutter (3118), and the stationary cutter (3118) corresponds to the entrance (3117).

5. The linear easy-tear liquid packaging sheet preparation device according to claim 1, characterized in that: A retaining ring (3115) is fixedly sleeved on the outer wall of the shredding cover (3114), a disassembly cover (3112) is movably sleeved on the outer wall of the shredding cover (3114), a rear circulation groove (3120) is formed on the outer wall of the disassembly cover (3112), and a connecting column (3113) is fixedly assembled on the outer wall of the rear circulation groove (3120).

6. The linear easy-tear liquid packaging sheet preparation device according to claim 5, characterized in that: The inner wall of the adjustment bracket (3202) is fixedly equipped with a vertical rod (3204), the outer edge of the vertical rod (3204) is movably sleeved with a locking rod (3205), the top of the locking rod (3205) is provided with a locking groove (3206), and the inner wall of the locking groove (3206) is slidably connected to the connecting column (3113).

7. The device for preparing a linear easy-tear liquid packaging sheet according to claim 6, characterized in that: An unlocking groove (3207) is provided on the inner wall of the locking groove (3206), and a reinforcing plate (3208) is fixedly mounted on the top of the locking rod (3205).

8. A linear easy-tear sheet for liquid packaging, characterized by: The linear easy-tear liquid packaging sheet includes a surface layer, a middle layer, and a bottom layer arranged in sequence. The surface layer includes 60%-80% by mass of polyethylene terephthalate and 20%-40% by mass of synthetic plant esters. The middle layer includes 40%-60% by mass of nylon, 30%-50% by mass of polyethylene, and 10%-20% by mass of cycloolefin copolymer. The bottom layer includes 40%-60% by mass of polyethylene, 20%-40% by mass of ethylene-vinyl alcohol copolymer, and 10%-20% by mass of cycloolefin copolymer.

9. A method for preparing a linear easy-tear sheet for liquid packaging, characterized in that: The following steps are involved: Step S1: Weighing 70% of polyethylene terephthalate and 30% of synthetic plant ester, 50% of nylon, 30% of polyethylene, and 20% of cyclic olefin copolymer, and 60% of polyethylene, 20% of ethylene-vinyl alcohol copolymer, and 20% of cyclic olefin copolymer, respectively, and then drying all raw materials; Step S2: Evenly mix the weighed polyethylene terephthalate and synthetic plant ester to form the surface layer material; evenly mix nylon, polyethylene and cycloolefin copolymer to form the middle layer material; evenly mix polyethylene, ethylene-vinyl alcohol copolymer and cycloolefin copolymer to form the bottom layer material; Step S3: Set the extruder temperature to 230-245°C for the surface layer extruder, 185-195°C for the middle layer extruder, and 175-185°C for the bottom layer extruder; set the co-extrusion die temperature to 195-205°C; and add the surface layer raw material, middle layer raw material, and bottom layer raw material mixed in S2 into the corresponding extruder hoppers respectively; Step S4: Extruding the surface layer, middle layer, and bottom layer materials simultaneously through a co-extrusion die to form a three-layer structure sheet; Step S5: The extruded sheet is subjected to physical stretching treatment with a stretching ratio of 1.5-2.5:1, a stretching temperature of 60-80°C, and a stretching speed of 1-3 m / min, so that the middle layer material forms an oriented structure along a specific direction to achieve linear tearing performance; Step S6: The temperature of the cooling roller is set to 50-60°C, and the stretched sheet is cooled and shaped by the cooling roller; Step S7: The shaped sheet is inserted into the cutting machine (1), and then the cutting knife (2) is adjusted to cut the edge of the sheet by the cutting knife (2). The cut sheet edge is wound up by the winding and crushing mechanism (3); Step S8: The cooled and shaped sheet is rolled into a roll and subjected to quality inspection, including appearance inspection, thickness measurement, barrier performance test, and tearability test.

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