A high-strength lightweight packaging carton and a method for manufacturing the same

Abstract

The application belongs to the technical field of packaging carton production, and discloses a high-strength lightweight packaging carton and a preparation method thereof, which comprises a box assembly capable of being folded and having a ring-shaped structure, and two groups of box cover assemblies arranged on the top and bottom of the box assembly respectively, a partition plate one is detachably connected in the box assembly, the two ends of the partition plate one are connected with the corresponding two inner walls of the box assembly respectively, a partition plate two is arranged in the box assembly and is perpendicular to the partition plate one, the partition plate one and the partition plate two divide the box assembly into multiple placing cavities, and a slot one is arranged at the bottom of the partition plate two and is inserted with the partition plate one. Compared with the prior art, the application improves the existing structure, and the cumbersome operation of placing the partition plate one and the partition plate two in the box assembly after unfolding the box assembly is avoided, so that the application is more convenient to use, the operation time is reduced, and in addition, the box assembly, the partition plate one and the partition plate two can be transported as a whole, thereby facilitating the overall transportation.

Description

Technical Field

[0001] This invention relates to the field of packaging carton production technology, and in particular to a high-strength lightweight packaging carton and its preparation method. Background Technology

[0002] Cardboard box packaging is a common form of packaging because it can be laid flat as a board before use, making it easy to stack for logistics, transport and store. When in use, it can be easily and quickly folded into shape, and it also has many advantages such as easy manufacturing and low cost, thus gaining widespread use.

[0003] Chinese utility model patent CN224171506U discloses a deformation-resistant cigarette packaging carton, characterized by comprising a carton body, a honeycomb pad, a first reinforcing plate, a second reinforcing plate, and a top plate; the outer layer of the carton body is coated with a waterproof and breathable membrane, and the inner layer is coated with a bamboo fiber reinforcing layer; the honeycomb pad is located at the bottom of the carton body, and a limiting groove is provided above the honeycomb pad; the first and second reinforcing plates are embedded in the limiting groove of the honeycomb pad; the top plate is located above the reinforcing plates, and a buffer plate is provided in the top plate, with a fixing groove below the top plate for limiting the position of the reinforcing plates. The waterproof and breathable membrane is formed by coating with nano-silica modified starch adhesive, which can effectively block the intrusion of external moisture while ensuring a good breathable environment inside the carton, preventing tobacco products from getting damp or affecting quality due to lack of breathability. The bamboo fiber reinforcing layer is used to improve the local tear resistance of the carton, preventing the carton from being damaged by friction and collision during handling and storage. The limiting grooves are arranged perpendicularly to each other, and the depth of the limiting grooves is less than the thickness of the honeycomb pad. The lower half of the first reinforcing plate is provided with a reserved hole one, and the upper half of the second reinforcing plate is provided with a reserved hole two. By setting the reserved hole one and the reserved hole two, the first reinforcing plate and the second reinforcing plate are perpendicular to each other and stably connected, thereby enhancing the overall protection strength of the reinforcing plate for the products inside the box.

[0004] In the aforementioned prior art, the first reinforcing plate, the second reinforcing plate, the honeycomb pad, and the top plate are all independent, separate components. During use, the box must first be unfolded, then the honeycomb pad must be placed at the bottom of the box, followed by the first and second reinforcing plates being interlocked into the limiting grooves of the honeycomb pad, and finally the top plate is placed. The entire installation process is cumbersome and time-consuming, severely impacting packaging efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a high-strength, lightweight packaging carton and its preparation method.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a high-strength lightweight packaging carton, comprising a foldable box assembly with a ring structure and two sets of box cover assemblies respectively disposed at the top and bottom of the box assembly, wherein a partition 1 is detachably connected inside the box assembly, and the two ends of the partition 1 are respectively connected to two corresponding inner walls inside the box assembly, wherein a partition 2 is disposed inside the box assembly perpendicular to the partition 1, the partition 1 and the partition 2 divide the inside of the box assembly into multiple placement cavities, wherein the bottom of the partition 2 is provided with a slot 1 for insertion into the partition 1, and the top of the partition 1 is provided with a slot 2 for insertion into the partition 2, wherein the surface of the partition 1 is recessed and formed with multiple bending grooves 1.

[0007] By adopting the above technical solution, the box assembly is folded, and the inner wall of the box assembly in contact with the partition 1 will compress the partition 1, causing the partition 1 to bend along the multiple bending grooves provided thereon. This allows the box assembly, partition 1, and partition 2 to be folded into a sheet shape. Similarly, the box assembly is unfolded, and the partition 1 is unfolded along the multiple bending grooves thereon until the box assembly returns to its box state. Compared with the cumbersome operation of the prior art, which requires unfolding the box assembly and then placing partition 1 and partition 2 inside the box assembly, this method is more convenient to use and reduces operation time. In addition, the box assembly, partition 1, and partition 2 can be transported as a whole, which facilitates overall transportation.

[0008] Furthermore, the box assembly includes two parallel side plates 1 and two side plates 2 fixed between the two side plates 1 and arranged parallel to each other. A bending groove 2 is recessed on the wall surface of the side plate 1 near the partition 1. The box cover assembly includes two cover plates 1 respectively fixed on the side plates 2 and two cover plates 2 respectively fixed on the side plates 1. A bending groove 3 is recessed on the wall surface of the cover plates 2 near the partition 1.

[0009] By adopting the above technical solution, the setting of bending groove 2 and bending groove 3 facilitates the bending operation of side plate 1 and cover plate 2.

[0010] Furthermore, both ends of the partition plate one are provided with protrusions so that the partition plate one forms an I-shaped structure. The top of the side plate two is provided with a limiting groove that is inserted into the protrusion of the partition plate one. The top of the cover plate one is provided with a clearance groove that extends to its bottom and allows the protrusion of the partition plate one to pass through. The number of clearance grooves, the number of limiting grooves and the number of protrusions are all equal and their positions correspond one-to-one.

[0011] By adopting the above technical solution, the setting of the limiting groove and the protrusion of the partition can be used to replace different types of partitions according to needs, thus expanding the scope of application.

[0012] Furthermore, both the box body assembly and the box lid assembly are composed of two paper layers and a thermoplastic polyolefin (TPO) layer fixed between the two paper layers. The thermoplastic polyolefin (TPO) layer has an internal hollow structure. Since the paper layers are made of high-density paperboard and the thermoplastic polyolefin (TPO) layer is used as an intermediate layer to increase the overall strength, and the density of thermoplastic polyolefin is less than that of high-density paperboard, the box is lighter than a carton made entirely of high-density paperboard.

[0013] By adopting the above technical solution, the overall strength is increased by using high-density paperboard for the paper layer and thermoplastic polyolefin (TPO) layer as the intermediate layer. At the same time, the density of thermoplastic polyolefin is less than that of high-density paperboard and the thermoplastic polyolefin (TPO) layer has an internal hollow structure, making the carton lighter than that made entirely of high-density paperboard.

[0014] This application also discloses a method for preparing a high-strength lightweight packaging carton, used to produce the aforementioned high-strength lightweight packaging carton, comprising the following steps: S1, preparing paper and thermoplastic polyolefin (TPO) raw materials; S2. Paperboard is prepared from the raw materials of paper, and thermoplastic polyolefin (TPO) is made into hollow thermoplastic polyolefin (TPO) board through extrusion molding process. S3. Two pieces of cardboard sandwich a thermoplastic polyolefin (TPO) board in the middle to form a composite board, and the composite board is fixed by hot melt bonding process; S4. Use a slitting device to cut large composite boards into multiple smaller composite boards of equal size; S5. Grooving, crease pressing, and die-cutting of small composite board pieces; S6. Nail or glue the small composite boards that have completed step S5 into boxes. S7. Inspect the finished box.

[0015] Furthermore, the slitting equipment includes a slitting mechanism and a limiting mechanism. The slitting mechanism includes a slitting assembly, which includes a roller conveyor, a mounting frame fixed on the roller conveyor frame, an upper roller rotatably mounted in the mounting frame and electrically driven, a lower roller rotatably mounted in the mounting frame and located below the upper roller, a fixed cutter fixedly sleeved on the upper roller and located in the middle of the upper roller, and two sliding cutters sleeved on the upper roller and located on one side of the fixed cutter. The distance between the sliding cutter close to the fixed cutter and the fixed cutter is equal to the distance between the two sliding cutters.

[0016] By adopting the above technical solution, the cardboard to be cut is placed on the rollers of the roller conveyor. The roller conveyor works to transport the cardboard to the position between the upper roller and the lower roller. The rotating upper roller drives the fixed cutter and the sliding cutter to rotate and cut the cardboard that passes between the upper roller and the lower roller to obtain multiple pieces of cardboard of equal size.

[0017] Furthermore, the outer wall of the upper roller is provided with a through hole, and the inner wall of the sliding cutter is slidably engaged with the outer wall of the upper roller. The slitting mechanism also includes a distance adjustment component, which includes a slider slidably disposed in the through hole and fixed to the sliding cutter, an annular plate sleeved on the upper roller and fixed to the slider, a connecting plate disposed on the annular plate, an adjusting rod rotatably mounted on the connecting plate, a lifting plate slidably disposed in the mounting frame, and a hydraulic push rod fixed on the mounting frame. The connecting plate has a mounting through hole, the annular plate passes through the mounting through hole and is rotatably connected to the mounting through hole through a bearing, the moving end of the hydraulic push rod is fixedly connected to the lifting plate, and the lifting plate has an adjusting hole that is inclined and slidably engaged with the adjusting rod. The number of sliders, the number of annular plates, the number of connecting plates, the number of adjusting rods, and the number of adjusting holes are all equal and their positions correspond one-to-one. The slopes of the two adjusting holes are different.

[0018] By adopting the above technical solution, the hydraulic push rod moves its moving end, which in turn drives the lifting plate fixed to the moving end of the hydraulic push rod to rise or fall. This causes the adjusting rod that slides with the adjusting hole, the connecting plate connected to the adjusting rod, the annular plate connected to the connecting plate, the slider fixed to the annular plate, and the sliding cutter fixed to the slider to all move horizontally toward or away from the fixed cutter. This adjusts the distance between the fixed cutter and the sliding cutter on the side closest to it, as well as the distance between the two sliding cutters, thereby enabling the cutting of cardboard of various widths and expanding the scope of application.

[0019] Furthermore, the limiting mechanism includes a limiting component, which includes a limiting frame slidably disposed within the housing assembly frame and located on the upper side of the housing assembly rollers, a connecting frame penetrating the housing assembly frame and slidably engaged with the housing assembly, a drive housing fixed to the bottom of the housing assembly frame, a crossbar fixed within the drive housing, a bidirectional threaded rod penetrating the side wall of the drive housing and rotatably connected to the drive housing, and multiple rotating columns rotatably mounted on the side wall of the limiting frame near the fixed cutter. The distance between the limiting frame and the sliding cutter on the side near it is equal to the distance between the two sliding cutters. The connecting frame penetrates the drive housing and slidably engages with the drive housing. The crossbar slidably engages with the connecting frame. The bidirectional threaded rod has threads with equal pitch and opposite directions at both ends. Both connecting frames are disposed on the two threads and threadedly connected. The limiting mechanism also includes a driving component for driving the bidirectional threaded rod to rotate.

[0020] By adopting the above technical solution, the limiting frame plays a limiting role in the movement of the cardboard, reducing the probability of deviation during the cardboard cutting process.

[0021] Furthermore, the drive assembly includes a gear fixedly sleeved on a bidirectional threaded rod, a rack meshing with the gear, a protective shell fixed to the frame of the housing assembly, and a connecting arm fixed to the rack. The rack passes through the top of the protective shell and slides in cooperation with it. A sliding hole is provided through the side wall of the mounting bracket for the connecting arm to pass through and slide in cooperation with it. The connecting arm is fixed to the lifting plate. The sliding cutter on the side closer to the fixed cutter moves a distance that is one-third of the distance the limit frame moves, ensuring that the limit frame and the sliding cutter are adjusted synchronously and always maintain a consistent cutting width.

[0022] By adopting the above technical solution, during the lifting process of the lifting plate, the connecting arm fixed to the lifting plate and the rack fixed to the connecting arm are both lifted, thereby causing the gear meshing with the rack and the bidirectional threaded rod fixed to the gear to rotate. This drives the connecting frame threadedly connected to the bidirectional threaded rod and the limiting frame fixed to the connecting frame to move towards or away from the fixed cutter, so as to adapt to the operation of various cutting widths of different sized cardboard.

[0023] Furthermore, a sliding rod is fixed inside the through hole, and the sliding rod passes through the two sliders in sequence and slides with both sliders.

[0024] By adopting the above technical solution and the design of the slider, the stability of the slider during movement is improved.

[0025] In summary, the present invention has the following beneficial effects: In this application, by improving the existing structure, compared with the cumbersome operation of unfolding the box assembly and then placing the first and second partitions inside the box assembly, it is more convenient to use and reduces the operation time. In addition, the box assembly, the first partition and the second partition can be transported as a whole, which facilitates the overall transportation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the internal structure of the housing assembly in an embodiment of the present invention; Figure 3 This is an exploded view of an embodiment of the present invention to highlight the connection structure between partition one and partition two; Figure 4 This is a plan view illustrating the box structure in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the connection structure between the roller conveyor and the connecting frame in an embodiment of the present invention; Figure 6 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the drive housing; Figure 7 This is a schematic diagram illustrating the connection structure between the connecting arm and the mounting bracket in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the connection structure between the slider and the upper roller in an embodiment of the present invention.

[0027] In the diagram: 1. Box assembly; 111. Side panel one; 112. Side panel two; 2. Box cover assembly; 21. Cover plate one; 22. Cover plate two; 3. Partition one; 4. Partition two; 5. Clearance groove; 6. Slot one; 7. Slot two; 8. Bending groove one; 9. Limiting groove; 10. Sliding mechanism; 101. Sliding assembly; 1011. Roller conveyor; 1012. Mounting frame; 1013. Upper roller; 1014. Lower roller; 1015. Fixed cutter; 1016. Sliding cutter; 102. Adjustable distance assembly; 1021. Slider; 1022. 1023. Annular plate; 1024. Connecting plate; 1025. Adjusting rod; 1026. Lifting plate; 1027. Hydraulic push rod; 1028. Adjusting hole; 12. Limiting mechanism; 121. Limiting assembly; 1211. Limiting frame; 1212. Connecting frame; 1213. Drive housing; 1214. Crossbar; 1215. Bidirectional threaded rod; 1216. Rotating column; 122. Drive assembly; 1221. Gear; 1222. Rack; 1223. Protective housing; 1224. Connecting arm; 1225. Sliding hole; 13. Through hole; 14. Sliding rod. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] like Figure 1-4As shown in the illustration, this application discloses a high-strength, lightweight packaging carton, including a carton body assembly 1 and a carton lid assembly 2. The carton body assembly 1 is foldable and forms a ring structure. A partition 3 is detachably connected inside the carton body assembly 1, with both ends of the partition 3 connected to two corresponding inner walls of the carton body assembly 1. A partition 4 is provided inside the carton body assembly 1, perpendicular to the partition 3. The partitions 3 and 4 divide the carton body assembly 1 into multiple storage cavities. A slot 6 is provided at the bottom of the partition 4 for insertion into the partition 3, and a slot 7 is provided at the top of the partition 3 for insertion into the partition 4. Multiple bending grooves 8 are recessed into the surface of the partition 3. Folding the box assembly 1 causes the inner wall of the box assembly 1 in contact with the partition 3 to compress the partition 3, causing the partition 3 to bend along the multiple bending grooves 8. This folds the box assembly 1, partition 3, and partition 4 into a sheet shape. Similarly, unfolding the box assembly 1 and unfolding the partition 3 along the multiple bending grooves 8 continues until the box assembly 1 returns to its box state. Compared to the cumbersome operation of unfolding the box assembly 1 and then placing the partition 3 and partition 4 inside the box assembly 1 in the existing technology, this method is more convenient and reduces operation time. In addition, the box assembly 1, partition 3, and partition 4 can be transported as a whole, facilitating overall transportation.

[0030] The box assembly 1 includes two side panels 111 and 112. The two side panels 111 are arranged parallel to each other, and a bending groove 2 is recessed on the wall surface of the side panel 111 near the partition 3. The two side panels 112 are fixed between the two side panels 111 and arranged parallel to each other. The box lid assembly 2 includes two lids 21 and 22. The two lids 21 are fixed to the side panels 112. The two lids 22 are fixed to the side panels 111, and a bending groove 3 is recessed on the wall surface of the lid 22 near the partition 3. The bending grooves 2 and 3 facilitate bending operations on the side panels 111 and 22.

[0031] Both ends of partition 3 have protrusions to form an I-shaped structure. The top of side plate 112 has a limiting groove 9 that engages with the protrusion of partition 3. The top of cover plate 21 has a clearance groove 5 that extends to its bottom and allows the protrusion of partition 3 to pass through. The number of clearance grooves 5, the number of limiting grooves 9, and the number of protrusions are all equal and their positions correspond one-to-one. The setting of limiting grooves 9 and protrusions of partition 3 allows for the replacement of different types of partition 3 as needed, thus expanding the scope of application.

[0032] Both the box body assembly 1 and the box lid assembly 2 consist of two paper layers and a thermoplastic polyolefin (TPO) layer fixed between the two paper layers. The TPO layer has a hollow internal structure. Because the paper layers are made of high-density paperboard and the TPO layer is used as an interlayer to increase overall strength, and because the density of TPO is lower than that of high-density paperboard, the box is lighter than one made entirely of high-density paperboard.

[0033] like Figure 5-8 As shown in the embodiments of this application, a method for preparing a high-strength lightweight packaging carton is also disclosed, which is used to produce the aforementioned high-strength lightweight packaging carton, including the following steps: S1, preparing paper and thermoplastic polyolefin (TPO) raw materials; S2. Paperboard is prepared from the raw materials of paper, and thermoplastic polyolefin (TPO) is made into hollow thermoplastic polyolefin (TPO) board through extrusion molding process. S3. Two pieces of cardboard sandwich a thermoplastic polyolefin (TPO) board in the middle to form a composite board, and the composite board is fixed by hot melt bonding process; S4. Use a slitting device to cut large composite boards into multiple smaller composite boards of equal size; S5. Grooving, crease pressing, and die-cutting of small composite board pieces; S6. Nail or glue the small composite boards that have completed step S5 into boxes. S7. Inspect the finished box.

[0034] The slitting equipment includes a slitting mechanism 10 and a limiting mechanism 12. The slitting mechanism 10 includes a slitting assembly 101 and a spacing adjustment assembly 102. The slitting assembly 101 includes a roller conveyor 1011, a mounting frame 1012, an upper roller 1013, a lower roller 1014, a fixed cutter 1015, and a sliding cutter 1016. The mounting frame 1012 is fixed to the frame of the roller conveyor 1011. The upper roller 1013 is rotatably mounted inside the mounting frame 1012 and is electrically driven. The lower roller 1014 is rotatably mounted inside the mounting frame 1012 and located below the upper roller 1013. The fixed cutter 1015 is fixedly sleeved on the upper roller 1013 and located in the middle of the upper roller 1013. Two sliding cutters 1016 are provided, which are sleeved on the upper roller 1013 and located on one side of the fixed cutter 1015. The distance between the sliding cutter 1016 closest to the fixed cutter 1015 and the fixed cutter 1015 is equal to the distance between the two sliding cutters 1016. The cardboard to be slit is placed on the rollers of the roller conveyor 1011. The roller conveyor 1011 works to transport the cardboard to the position between the upper roller 1013 and the lower roller 1014. The rotating upper roller 1013 drives the fixed cutter 1015 and the sliding cutter 1016 to rotate, and performs slitting on the cardboard passing between the upper roller 1013 and the lower roller 1014 to obtain multiple pieces of cardboard of equal size.

[0035] A through hole 13 is provided through the outer wall of the upper roller 1013, and the inner wall of the sliding cutter 1016 slides in cooperation with the outer wall of the upper roller 1013. The pitch adjustment assembly 102 includes a slider 1021, an annular plate 1022, a connecting plate 1023, an adjusting rod 1024, a lifting plate 1025, and a hydraulic push rod 1026. The slider 1021 is slidably disposed in the through hole 13 and fixed to the sliding cutter 1016. The annular plate 1022 is sleeved on the upper roller 1013 and fixed to the slider 1021, and the connecting plate 1023 is disposed on the annular plate 1022. The connecting plate 1023 has a mounting through hole 13, and the annular plate 1022 passes through the mounting through hole 13 and is rotatably connected to the mounting through hole 13 through a bearing. The adjusting rod 1024 is rotatably mounted on the connecting plate 1023, and the lifting plate 1025 is slidably disposed in the mounting frame 1012. The lifting plate 1025 has an adjustment hole 1027 that is inclined and slides in cooperation with the adjustment rod 1024. The number of sliders 1021, annular plates 1022, connecting plates 1023, adjustment rods 1024, and adjustment holes 1027 are all equal and their positions correspond one-to-one. The slopes of the two adjustment holes 1027 are different, so that the sliding cutter 1016 on the side closer to the fixed cutter 1015 moves laterally by a distance that is half the distance that the sliding cutter 1016 on the side farther from the fixed cutter 1015 moves laterally, ensuring that the distance between the fixed cutter 1015 and the sliding cutter 1016 on the side closer to it is equal to the distance between the two sliding cutters 1016. The hydraulic push rod 1026 is fixed on the mounting bracket 1012, and the moving end of the hydraulic push rod 1026 is fixedly connected to the lifting plate 1025. The hydraulic push rod 1026 operates to move its moving end, which in turn drives the lifting plate 1025, which is fixed to the moving end of the hydraulic push rod 1026, to rise or fall. This causes the adjusting rod 1024, which slides in conjunction with the adjusting hole 1027, the connecting plate 1023 connected to the adjusting rod 1024, the annular plate 1022 connected to the connecting plate 1023, the slider 1021 fixed to the annular plate 1022, and the sliding cutter 1016 fixed to the slider 1021 to move horizontally toward or away from the fixed cutter 1015. This adjusts the distance between the fixed cutter 1015 and the sliding cutter 1016 on one side of it, as well as the distance between the two sliding cutters 1016, thereby enabling the cutting of cardboard of various widths and expanding the range of applications.

[0036] The limiting mechanism 12 includes a limiting component 121 and a driving component 122. The limiting component 121 includes a limiting frame 1211, a connecting frame 1212, a driving housing 1213, a crossbar 1214, a bidirectional threaded rod 1215, and a rotating column 1216. The limiting frame 1211 is slidably disposed within the housing assembly 1 and located above the rollers of the housing assembly 1. The distance between the limiting frame 1211 and the sliding cutter 1016 on its adjacent side is equal to the distance between the two sliding cutters 1016. The connecting frame 1212 penetrates the housing assembly 1 and is slidably engaged with the housing assembly 1. The connecting frame 1212 also penetrates the driving housing 1213 and is slidably engaged with the driving housing 1213. The crossbar 1214 is slidably engaged with the connecting frame 1212. The driving housing 1213 is fixed to the bottom of the housing assembly 1, and the crossbar 1214 is fixed inside the driving housing 1213. A bidirectional threaded rod 1215 penetrates the side wall of the drive housing 1213 and is rotatably connected to the drive housing 1213. The bidirectional threaded rod 1215 has threads with equal pitch and opposite directions at both ends. Two connecting brackets 1212 are both mounted on the two threads and are threadedly connected. Multiple rotating columns 1216 are rotatably mounted on the side wall of the limiting frame 1211 near the fixed cutter 1015. During the movement of the cardboard, the limiting frame 1211 limits the movement of the cardboard, reducing the probability of deviation during the cardboard cutting process.

[0037] The drive assembly 122 is used to drive the bidirectional threaded rod 1215 to rotate. The drive assembly 122 includes a gear 1221, a rack 1222, a protective shell 1223, and a connecting arm 1224. The sliding cutter 1016, which is closer to the fixed cutter 1015, moves a distance that is one-third of the moving distance of the limit frame 1211, ensuring that the limit frame 1211 and the sliding cutter 1016 are adjusted synchronously and always maintain a consistent cutting width. The gear 1221 is fixedly sleeved on the bidirectional threaded rod 1215, and the rack 1222 meshes with the gear 1221. The rack 1222 passes through the top of the protective shell 1223 and slides in cooperation with the protective shell 1223. The protective shell 1223 is fixed to the frame of the box assembly 1, and the connecting arm 1224 is fixed to the rack 1222. A sliding hole 1225 is provided through the side wall of the mounting frame 1012 for the connecting arm 1224 to pass through and slide in cooperation with the connecting arm 1224. The connecting arm 1224 is fixed to the lifting plate 1025. During the lifting process of the lifting plate 1025, the connecting arm 1224 fixed to the lifting plate 1025 and the rack 1222 fixed to the connecting arm 1224 are driven to rise and fall, thereby causing the gear 1221 meshing with the rack 1222 and the bidirectional threaded rod 1215 fixed to the gear 1221 to rotate. This drives the connecting frame 1212 threadedly connected to the bidirectional threaded rod 1215 and the limiting frame 1211 fixed to the connecting frame 1212 to move toward or away from the fixed cutter 1015, so as to adapt to the operation of various cutting widths of different sized cardboard.

[0038] A slide rod 14 is fixed inside the through hole 13. The slide rod 14 passes through the two sliders 1021 in sequence and slides with both sliders 1021. The slide rod 14 improves the stability of the sliders 1021 when they move.

[0039] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-strength, lightweight packaging carton, characterized in that: The box assembly includes a box body assembly (1) and two sets of box cover assemblies (2) respectively located at the top and bottom of the box body assembly (1). A partition 1 (3) is detachably connected inside the box body assembly (1). A partition 2 (4) is provided inside the box body assembly (1) and is perpendicular to the partition 1 (3). The partition 1 (3) and partition 2 (4) divide the box body assembly (1) into multiple placement cavities. A slot 1 (6) is provided at the bottom of the partition 2 (4) for insertion into the partition 1 (3). A slot 2 (7) is provided at the top of the partition 1 (3) for insertion into the partition 2 (4). Multiple bending grooves 1 (8) are recessed on the surface of the partition 1 (3).

2. The high-strength lightweight packaging carton according to claim 1, characterized in that: The box assembly (1) includes two parallel side plates (111) and two parallel side plates (112) fixed between the two side plates (111). The side plate (111) has a bending groove (2) recessed on the wall surface near the partition (3). The box cover assembly (2) includes two cover plates (21) fixed on the side plate (112) and two cover plates (22) fixed on the side plate (111). The cover plate (22) has a bending groove (3) recessed on the wall surface near the partition (3).

3. A high-strength, lightweight packaging carton according to claim 2, characterized in that: Both ends of the partition 1 (3) are provided with protrusions so that the partition 1 (3) forms an I-shaped structure. The top of the side plate 2 (112) is provided with a limiting groove (9) that is inserted into the protrusion of the partition 1 (3). The top of the cover plate 1 (21) is provided with a relief groove (5) that extends to its bottom and allows the protrusion of the partition 1 (3) to pass through. The number of relief grooves (5), the number of limiting grooves (9) and the number of protrusions are all equal and their positions correspond one to one.

4. A high-strength, lightweight packaging carton according to claim 1, characterized in that: The entire box assembly (1) and box lid assembly (2) consist of two paper layers and a thermoplastic polyolefin (TPO) layer fixed between the two paper layers. The thermoplastic polyolefin (TPO) layer has a hollow internal structure. Since the paper layers are made of high-density paperboard and the thermoplastic polyolefin (TPO) layer is used as an intermediate layer, the overall strength is increased. At the same time, the density of thermoplastic polyolefin is less than that of high-density paperboard, so the box is lighter than the box made entirely of high-density paperboard.

5. A method for preparing a high-strength lightweight packaging carton, used to produce the high-strength lightweight packaging carton according to any one of claims 1-4, characterized in that: Includes the following steps: S1. Prepare the raw materials for paper and thermoplastic polyolefin (TPO); S2. Paperboard is prepared from the raw materials of paper, and thermoplastic polyolefin (TPO) is made into hollow thermoplastic polyolefin (TPO) board through extrusion molding process. S3. Two pieces of cardboard sandwich a thermoplastic polyolefin (TPO) board in the middle to form a composite board, and the composite board is fixed by hot melt bonding process; S4. Use a slitting device to cut large composite boards into multiple smaller composite boards of equal size; S5. Grooving, crease pressing, and die-cutting of small composite board pieces; S6. Nail or glue the small composite boards that have completed step S5 into boxes. S7. Inspect the finished box.

6. The method for preparing a high-strength, lightweight packaging carton according to claim 5, characterized in that: The slitting equipment includes a slitting mechanism (10) and a limiting mechanism (12). The slitting mechanism (10) includes a slitting assembly (101). The slitting assembly (101) includes a roller conveyor (1011), a mounting frame (1012) fixed on the frame of the roller conveyor (1011), an upper roller (1013) rotatably mounted in the mounting frame (1012) and electrically driven, and a lower roller (1013) rotatably mounted in the mounting frame (1012) and located on the upper roller (1013). 13) The lower roller (1014), the fixed cutter (1015) fixedly sleeved on the upper roller (1013) and located in the middle of the upper roller (1013), and two sliding cutters (1016) sleeved on the upper roller (1013) and located on one side of the fixed cutter (1015). The distance between the sliding cutter (1016) close to the fixed cutter (1015) and the fixed cutter (1015) is equal to the distance between the two sliding cutters (1016).

7. The method for preparing a high-strength, lightweight packaging carton according to claim 6, characterized in that: The outer wall of the upper roller (1013) is provided with a through hole (13). The inner wall of the sliding cutter (1016) is slidably engaged with the outer wall of the upper roller (1013). The slitting mechanism (10) also includes a distance adjustment assembly (102). The distance adjustment assembly (102) includes a slider (1021) slidably disposed in the through hole (13) and fixed to the sliding cutter (1016), an annular plate (1022) sleeved on the upper roller (1013) and fixed to the slider (1021), a connecting plate (1023) disposed on the annular plate (1022), an adjusting rod (1024) rotatably mounted on the connecting plate (1023), a lifting plate (1025) slidably disposed in the mounting frame (1012), and a fixed to the mounting frame. The hydraulic push rod (1026) on (1012) has an installation through hole (13) on the connecting plate (1023). The annular plate (1022) passes through the installation through hole (13) and is rotatably connected to the installation through hole (13) through a bearing. The moving end of the hydraulic push rod (1026) is fixedly connected to the lifting plate (1025). The lifting plate (1025) has an adjustment hole (1027) that is inclined and slides with the adjustment rod (1024). The slopes of the two adjustment holes (1027) are different, so that the sliding cutter (1016) on the side closer to the fixed cutter (1015) moves a certain distance laterally, which is half the distance of the sliding cutter (1016) on the side away from the fixed cutter (1015).

8. The method for preparing a high-strength lightweight packaging carton according to claim 7, characterized in that: The limiting mechanism (12) includes a limiting component (121), which includes a limiting frame (1211) slidably disposed in the frame of the housing assembly (1) and located on the upper side of the roller of the housing assembly (1), a connecting frame (1212) penetrating the frame of the housing assembly (1) and slidably engaged with the housing assembly (1), a drive housing (1213) fixed to the bottom of the frame of the housing assembly (1), a crossbar (1214) fixed in the drive housing (1213), a bidirectional threaded rod (1215) penetrating the side wall of the drive housing (1213) and rotatably connected to the drive housing (1213), and multiple rods rotatably mounted on the limiting frame (1211) near the fixed cut. The rotating column (1216) on one side wall of the blade (1015), the distance between the limiting frame (1211) and the sliding cutter (1016) near it is equal to the distance between the two sliding cutters (1016), the connecting frame (1212) passes through the drive housing (1213) and slides with the drive housing (1213), the crossbar (1214) slides with the connecting frame (1212), the bidirectional threaded rod (1215) is provided with threads with equal pitch at both ends and opposite directions of rotation, the two connecting frames (1212) are both set on the two sections of threads and threadedly connected, the limiting mechanism (12) also includes a driving assembly (122).

9. The method for preparing a high-strength, lightweight packaging carton according to claim 8, characterized in that: The drive assembly (122) includes a gear (1221) fixedly sleeved on a bidirectional threaded rod (1215), a rack (1222) meshing with the gear (1221), a protective shell (1223) fixed to the frame of the housing assembly (1), and a connecting arm (1224) fixed to the rack (1222). The rack (1222) passes through the top of the protective shell (1223) and slides in cooperation with the protective shell (1223). The mounting bracket (1012) A sliding hole (1225) is provided through the side wall for the connecting arm (1224) to pass through and slide in cooperation with the connecting arm (1224). The connecting arm (1224) is fixed to the lifting plate (1025). The sliding cutter (1016) on the side closer to the fixed cutter (1015) moves a distance that is one-third of the moving distance of the limit frame (1211), ensuring that the limit frame (1211) and the sliding cutter (1016) are adjusted synchronously and always maintain a consistent cutting width.

10. The method for preparing a high-strength lightweight packaging carton according to claim 7, characterized in that: A sliding rod (14) is fixed inside the through hole (13). The sliding rod (14) passes through the two sliders (1021) in sequence and slides with both sliders (1021).

Images