Double-layer logistics box and preparation method thereof

Abstract

The invention discloses a double-layer logistics box and a preparation method thereof, and relates to the technical field of packaging products. Comprising a logistics box main body, and the logistics box main body is formed by oppositely placing two buffer cover cavities and locking through a screw pair or bundling and connecting through a bundling belt; the buffering cover is of a double-wall hollow structure formed by blow molding of environment-friendly flame-retardant plastic, has good strength and buffering performance through the wall face reinforcing ribs, the wall face steps and the wall face arc design, is resistant to pressure and impact and not prone to breakage, and is environmentally friendly, flame-retardant, waterproof, damp-proof and mildew-proof; furthermore, a sealed air layer or vacuum sealing treatment or foaming filling or other heat insulation treatment is adopted between the double-layer walls, so that the heat insulation box can be conveniently made; therefore, a logistics foam box can be replaced, and the defects that a foam box is not environmentally friendly, low in strength, inflammable and fragile, cannot load slightly heavy products and the like can be overcome; the double-layer logistics box provides a brand new solution for the fields of cold-chain logistics, fresh food e-commerce, medicine transportation and the like, and has a wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging products, and particularly to a double-layer logistics box and a preparation method thereof. Background Art

[0002] At present, for the logistics transportation of items that need to be fresh-keeping and pressure-proof, such as fresh food, fruits and vegetables, and food, most of them use foam boxes for protection. However, foam boxes have the following serious defects:

[0003] 1. Non-environmental protection; foam products are not environmentally friendly. Foam is not only difficult to degrade, but also contains many toxic substances and cannot pass the environmental protection test. Moreover, foam is easy to break into small particles to form microplastics (foam particles with a diameter less than 5 mm), causing serious harm to animals and nature;

[0004] 2. Although foam has good cushioning performance, its strength is limited and it is very brittle. When protecting slightly heavier products, it is easy to break and lose the protection function;

[0005] 3. Foam is an extremely flammable substance. As long as it encounters a spark, it will immediately burn and is very difficult to extinguish. There is a fire hazard no matter where it is stacked;

[0006] 4. The heat preservation performance of thick-wall foam boxes is limited. Foam boxes with ice packs are generally fresh-keeping for about 18 - 48 hours, and this time period cannot complete delivery in many places in China under normal circumstances. Summary of the Invention

[0007] To achieve the above object, the present invention provides the following technical solution: a double-layer logistics box and a preparation method thereof, including a logistics box main body, a buffer heat preservation storage space is arranged inside the logistics box main body, the logistics box main body includes two symmetrically arranged buffer covers locked by a bundling belt or a screw pair, and the buffer cover is a double-layer wall structure with a cavity arranged between the double-layer walls.

[0008] As a preferred technical solution of the present invention, a groove is arranged at the connection of the inner side wall and the outer side wall of the buffer cover.

[0009] As a preferred technical solution of the present invention, the cavity is one of a vacuum heat insulation cavity, a sealed air layer, a foaming glue heat insulation layer or a heat insulation material filling layer.

[0010] As a preferred technical solution of the present invention, a plurality of criss-crossing wall surface reinforcing ribs are arranged on the bottom surfaces of the inner side wall and the outer side wall.

[0011] As a preferred technical solution of the present invention, the wall surface reinforcing ribs are segmented and arc-shaped and deepened towards the cavity.

[0012] As a preferred technical solution of the present invention, a lifting step is provided on the outer sidewall, and the four sides of the lifting step are all arc-shaped.

[0013] As a preferred technical solution of the present invention, connection holes are provided inside the four corners of the lifting step for connecting two buffer covers by means of screw pairs or tying straps.

[0014] As a preferred technical solution of the present invention, a number of sidewall reinforcing ribs are provided on the inner peripheral walls of the inner sidewall.

[0015] A preparation method of a double-layer logistics box includes the following steps:

[0016] S1. Buffer cover forming: A buffer cover with a double-layer wall and a hollow structure is prepared by blow molding.

[0017] S2. Cavity treatment: The air between the cavities is evacuated by a vacuum machine to form a vacuum insulation cavity and then sealed, or the cavities are directly sealed to form a sealed air layer, or the cavities are filled with foaming agent to form a foaming agent insulation layer.

[0018] S3. Production of the box body strengthening structure: A lifting step is provided on the outer sidewall, sidewall reinforcing ribs are provided on the inner sidewall, and a number of arch-shaped wall surface reinforcing ribs that are criss-crossed and deepen in the depth direction of the cavity are provided corresponding to the bottom surfaces of the inner sidewall and the outer sidewall to strengthen the box body wall surface and support between the double-layer walls.

[0019] S4. Connection hole setting: Connection holes are provided inside the four corners of the lifting step, and the connection holes are not communicated with the cavities.

[0020] S5. Assembly and sealing: The two buffer cover cavities are placed opposite to each other, and are locked by passing screw pairs through the connection holes or tied by passing tying straps through the connection holes, or directly tied firmly with tape or wrapping tape, and the seams of the two buffer covers are sealed with tape or glue to form a sealed logistics box main body.

[0021] As a preferred technical solution of the present invention, an optional step is added between S1 and S2. When it is necessary to improve the heat insulation performance, the inner and outer walls are separated into dot connections or completely separated by laser cutting at the groove connection of the inner sidewall and the outer sidewall, and then one or a combination of aerogel, foaming agent or glass glue is filled in the cutting gap and then the cavity is sealed or evacuated and sealed or foamed. An optional step is added before S5. When it is necessary to improve the heat insulation performance, an aerogel heat insulation coating is applied to the outer sidewall and the lifting step.

[0022] Compared with the prior art, the present invention provides a double-layer logistics box and a preparation method thereof, having the following beneficial effects:

[0023] The double-layer logistics box and its preparation method adopt a buffer cover formed by blow molding process, which has no risk of foam fragmentation and avoids the harm of microplastics to the ecological environment. The double-layer wall structure design, combined with cavities and heat insulation coatings, realizes multi-level heat insulation. The mechanical strengthening structure composed of wall ribs and side wall ribs greatly improves the compressive capacity. The modular assembly method has a simple and fast operation method, completely solving the four major pain points of poor environmental protection, low strength, flammability, and weak heat preservation of foam boxes. At the same time, it realizes the industrial advantages of low cost, easy assembly, and long service life, providing a new solution for fields such as cold chain logistics, fresh food e-commerce, and pharmaceutical transportation, and having broad application prospects. Brief Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a double-layer logistics box and its preparation method proposed by the present invention;

[0025] Figure 2 It is an exploded view of the structure of a double-layer logistics box and its preparation method proposed by the present invention;

[0026] Figure 3 It is a schematic structural diagram of the buffer cover of a double-layer logistics box and its preparation method proposed by the present invention;

[0027] Figure 4 It is a sectional view of the main structure of the logistics box of a double-layer logistics box and its preparation method proposed by the present invention;

[0028] Figure 5 It is a sectional view of the buffer cover of a double-layer logistics box and its preparation method proposed by the present invention;

[0029] Figure 6 It is a schematic diagram of the laser cutting state of the groove of a double-layer logistics box and its preparation method proposed by the present invention;

[0030] Figure 7 It is a preparation method diagram of a double-layer logistics box and its preparation method proposed by the present invention.

[0031] In the figure: 1. Main body of the logistics box; 11. Buffer cover; 111. Inner side wall; 112. Outer side wall; 113. Cavity; 114. Groove; 115. Wall rib; 116. Lifting step; 117. Connecting hole; 118. Side wall rib; 119. Screw pair; 12. Buffer heat preservation storage space. Detailed Embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1-7 , a double-layer logistics box and its preparation method, including a logistics box body 1. A buffer heat preservation storage space 12 is arranged inside the logistics box body 1. The logistics box body 1 includes two symmetrically arranged buffer covers 11 locked by a bundling band or a screw pair 119. The buffer cover 11 has a double-layer wall structure, and a cavity 113 is arranged between the double-layer walls.

[0034] As a specific technical solution of this embodiment, a groove 114 is arranged at the connection of the inner side wall 111 and the outer side wall 112 of the buffer cover 11.

[0035] In this implementation scheme, the groove 114 at the connection of the inner side wall 111 and the outer side wall 112 is U-shaped. The inner side wall 111 and the outer side wall 112 are connected through the U-shaped groove 114, which enhances the anti-deformation ability of the edge of the double-layer wall and avoids cracks caused by stress concentration. The depth limit of the groove 114 can prevent the collapse of the inner and outer double-layer walls during vacuum pumping.

[0036] As a specific technical solution of this embodiment, the cavity 113 is one of a vacuum heat insulation cavity, a sealed air layer, a foaming glue heat insulation layer, or a heat insulation material filling layer.

[0037] In this implementation scheme, the vacuum heat insulation cavity significantly reduces the overall heat conduction coefficient of the box body by eliminating air heat conduction and convection, and is suitable for high heat insulation demand scenarios such as cold chain transportation; the sealed air layer utilizes the low heat conductivity of static air to achieve basic heat insulation while reducing the process complexity, and is suitable for low-cost and rapid production; the foaming glue heat insulation layer has both structural support and heat insulation functions, and is suitable for heavy-duty logistics scenarios with high requirements for mechanical strength.

[0038] As a specific technical solution of this embodiment, a plurality of criss-crossed wall strengthening ribs 115 are arranged on the bottom surfaces of the inner side wall 111 and the outer side wall 112.

[0039] In this implementation scheme, the criss-crossed wall strengthening ribs 115 form a grid support structure to disperse external impact forces, greatly improving the compressive strength of the box body.

[0040] As a specific technical solution of this embodiment, the wall strengthening ribs 115 are segmented and arc-shaped and deepened towards the cavity 113.

[0041] In this implementation scheme, the arched wall surface reinforcing rib 115 converts the vertical pressure into lateral supporting force, similar to the arched design of a bridge, further enhancing the compressive strength, reducing the material usage, and lowering the manufacturing cost, which is in line with economic benefits and has broad application prospects.

[0042] As a specific technical solution of this embodiment, a lifting step 116 is provided on the outer side wall 112, and the four sides of the lifting step 116 are all arc-shaped.

[0043] In this implementation scheme, the arc-shaped concave lifting step 116 conforms to the ergonomic design. When lifting with one hand, the contact area increases, the handling comfort is improved and it is not easy to slip off. At the same time, it adapts to narrow spaces, such as the grasping requirements when placed against the wall.

[0044] As a specific technical solution of this embodiment, connection holes 117 are provided inside the four corners of the lifting step 116 for connecting two buffer covers 11 by passing through screw pairs 119 or tying straps.

[0045] In this implementation scheme, the screw pair 119 is a combination of a screw and a nut. The screw and the nut are respectively placed inside the connection holes 117 on the two buffer covers 11, and the nut is tightened to complete the assembly. The connection holes 117 are designed to be isolated from the cavity 113 to avoid damaging the vacuum tightness of the cavity 113 when the screw is locked. At the same time, the four-corner distribution of the connection holes 117 makes the locking force uniform and reduces the deformation amount of the joint of the buffer cover 11.

[0046] As a specific technical solution of this embodiment, a number of side wall reinforcing ribs 118 are provided on the inner walls around the inner side wall 111.

[0047] A preparation method for a double-layer logistics box includes the following steps:

[0048] S1. Buffer cover forming: Prepare the buffer cover 11 with a double-layer wall hollow structure by blow molding process;

[0049] S2. Cavity treatment: Use a vacuum machine to evacuate the air between the cavities 113 to form a vacuum insulation cavity and then seal it, or directly seal the cavities 113 to form a sealed air layer, or use foaming glue to foam and fill the cavities 113 to form a foaming glue insulation layer;

[0050] S3. Production of the box body strengthening structure: A lifting step 116 is provided on the outer side wall 112, side wall reinforcing ribs 118 are provided on the inner side wall 111, and a number of arched wall surface reinforcing ribs 115 that are criss-crossed and deepened in the depth direction of the cavity 113 are correspondingly provided on the bottom surfaces of the inner side wall 111 and the outer side wall 112 to strengthen the box body wall surface and support between the double layers of walls;

[0051] S4. Set connection holes. Connection holes 117 are provided inside the four corners of the lifting step 116, and the connection holes 117 are not communicated with the cavity 113.

[0052] S5. Assemble and seal. Place the two buffer cover 11 cavities face to face, pass the screw pair 119 through the connection holes 117 to lock or pass the bundling belt through the connection holes 117 to bundle, or directly bundle firmly with tape or wrapping tape, and use tape or glue to seal the joint of the two buffer covers 11 to form a sealed logistics box body 1.

[0053] As a specific technical solution of this embodiment, refer to Figure 6 , add an optional step between S1 and S2. When it is necessary to improve the heat insulation performance, at the connection of the grooves 114 on the inner side wall 111 and the outer side wall 112, the inner and outer walls are separated by laser cutting into dot connections or completely separated, and then one or a combination of aerogel, foaming glue or glass glue is filled in the cutting gap, and then the cavity 113 is sealed or evacuated and then sealed or foamed. Add an optional step before S5. When it is necessary to improve the heat insulation performance, an aerogel heat insulation coating is applied on both the outer side wall 112 and the lifting step 116. The side wall reinforcing rib 118 and the heat insulation coating work together to reflect the external radiant heat while improving the lateral impact resistance, and the comprehensive heat insulation efficiency is improved. The heat insulation coating can adopt an aerogel coating.

[0054] In summary, for this double-layer logistics box and its preparation method, the buffer cover 11 formed by blow molding process has no risk of foam fragmentation and avoids the harm of microplastics to the ecological environment. The double-layer wall structure design, combined with the cavity 113 and the heat insulation coating, realizes multi-level heat insulation. The mechanical strengthening structure composed of the wall surface reinforcing rib 115 and the side wall reinforcing rib 118 greatly improves the compressive capacity. The modular assembly method has a simple and fast operation method, completely solves the four major pain points of poor environmental protection, low strength, flammability and weak heat preservation of the foam box, and at the same time realizes the industrial advantages of low cost, easy assembly and long service life, providing a new solution for fields such as cold chain logistics, fresh food e-commerce, and pharmaceutical transportation, and has broad application prospects.

[0055] It should be noted that in this article, terms such as "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer logistics box, comprising a logistics box main body (1), characterized in that: Inside the main body (1) of the logistics box, there is a buffer and heat-insulating storage space (12). The main body (1) of the logistics box includes two symmetrically arranged buffer covers (11) locked by a bundling strap or a screw pair (119). The buffer cover (11) has a double-wall structure, and a cavity (113) is arranged between the double walls.

2. The double-layer logistics box according to claim 1, characterized in that: A groove (114) is arranged at the connection of the inner side wall (111) and the outer side wall (112) of the buffer cover (11).

3. A double-layer logistics box according to claim 1, characterized in that: The cavity (113) is one of a vacuum heat-insulating cavity, a sealed air layer, a foamed plastic heat-insulating layer, or a heat-insulating material filling layer.

4. A double-layer logistics box according to claim 2, characterized in that: A number of criss-crossing wall strengthening ribs (115) are arranged on the bottom surfaces of the inner side wall (111) and the outer side wall (112).

5. A double-layer logistics box according to claim 4, characterized in that: The wall strengthening ribs (115) are segmented and are arched and deepened in the direction of the cavity (113).

6. A double-layer logistics box according to claim 2, characterized in that: A lifting step (116) is arranged on the outer side wall (112), and the four sides of the lifting step (116) are all arc-shaped.

7. A double-layer logistics box according to claim 6, characterized in that: Connection holes (117) are arranged inside the four corners of the lifting step (116) for passing through the screw pair (119) or the bundling strap to connect the two buffer covers (11).

8. The double-layer logistics box according to claim 2, wherein: A number of side wall strengthening ribs (118) are arranged on the inner peripheral walls of the inner side wall (111).

9. A preparation method of the double-layer logistics box according to any one of claims 1-8, characterized in that, It includes the following steps: S1. Buffer cover forming: Prepare the buffer cover (11) with a double-wall hollow structure by blow molding. S2. Cavity treatment: Use a vacuum machine to evacuate the air between the cavities (113) to form a vacuum heat-insulating cavity and then seal it, or directly seal the cavities (113) to form a sealed air layer, or use foamed plastic to foam and fill the cavities (113) to form a foamed plastic heat-insulating layer. S3. Production of the box body strengthening structure: A lifting step (116) is arranged on the outer side wall (112), side wall strengthening ribs (118) are arranged on the inner side wall (111), and a number of criss-crossing and arched wall strengthening ribs (115) deepened in the depth direction of the cavity (113) are correspondingly arranged on the bottom surfaces of the inner side wall (111) and the outer side wall (112) to strengthen the box body wall surface and support between the double walls. S4. Setting connection holes: Connection holes (117) are arranged inside the four corners of the lifting step (116), and the connection holes (117) are not communicated with the cavities (113). S5. Assembly and sealing: Place the cavities of the two buffer covers (11) facing each other, pass the screw pair (119) through the connection holes (117) to lock or pass the bundling strap through the connection holes (117) to bundle, or directly use tape or wrapping tape to bundle firmly, and use tape or glue to seal the joint of the two buffer covers (11) to form a sealed main body (1) of the logistics box.

10. The preparation method of a double-layer logistics box according to claim 1, characterized in that: Add an optional step between S1 and S2. When it is necessary to improve the heat insulation performance, separate the inner wall (111) and the outer wall into dot connections or complete separation by laser cutting at the connection of the grooves (114) of the inner wall and the outer wall, and then fill one or a combination of aerogel, foaming glue or glass glue at the cutting gap, and then seal or evacuate and seal or foam the cavity (113). Add an optional step before S5. When it is necessary to improve the heat insulation performance, apply an aerogel heat insulation coating on both the outer wall (112) and the lifting step (116).

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