A packaging box

Abstract

This application relates to the field of ice cream packaging production technology, specifically to a packaging box. The packaging box provided by this application has a middle layer structure. In this structure, the groove formed by the folded fixed plate and the middle layer plate, along with the three middle layers, achieves an inward snap-fit ​​opening and closing. Compared to plug-in or adhesive connections, this structure has a larger contact area and a tighter fit, effectively preventing accidental opening due to vibration or collision during transportation or display, thus improving the sealing reliability of the packaging box. Furthermore, the opening and closing process requires no additional tools; it can be completed simply by directly snapping and separating the three middle layers with the groove. This is convenient to operate and reusable, solving the problem of easily damaged and unreusable adhesive packaging boxes after opening and closing.

Description

Technical Field

[0001] This application relates to the field of ice cream packaging production technology, specifically to a packaging box. Background Technology

[0002] In the packaging and display of food, daily necessities, and other products, packaging display boxes must simultaneously meet core requirements such as product fixation, convenient opening and closing, and intuitive display. Especially for products with special shapes or that are fragile, such as ice cream cones, the packaging not only needs to securely hold the product from the inside to prevent shaking and damage during transportation or handling, but also needs to have good display functions so that consumers can quickly understand the product's appearance, while also taking into account ease of use to adapt to diverse usage scenarios.

[0003] Currently, most common packaging display boxes on the market adopt an adhesive connection structure. The adhesive structure uses adhesives such as glue to fix and connect the various parts of the box, which can achieve the packaging and basic protection functions of the product to a certain extent and is widely used in packaging scenarios of various products.

[0004] However, while adhesive structures can achieve a tight seal, they are prone to damage during opening and closing, making them unusable and increasing packaging costs and wasting resources. Utility Model Content

[0005] A packaging box includes an upper structure, a middle structure, and a lower structure. The two sides of the middle structure are connected to the upper and lower structures, respectively. The upper structure includes an upper first plate, an upper second plate, and an upper third plate. The upper first plate, the upper second plate, and the upper third plate are folded together to form the upper cover of the packaging box. The middle structure includes a middle first plate and a fixing plate. The middle first plate is connected to the fixing plate. After the fixing plate is folded, a groove is exposed at the connection between the fixing plate and the middle first plate. The upper third plate cooperates with the groove to complete the opening and closing of the packaging box.

[0006] According to one embodiment of this application, the middle layer structure further includes a middle layer three-plate, which is folded over and positioned opposite to the middle layer one-plate. An arc-shaped groove is formed on the fixing plate, which cooperates with the middle layer three-plate to fix and hold the contents of the packaging box.

[0007] According to one embodiment of this application, the middle layer structure further includes a second middle layer plate and a fourth middle layer plate. The first middle layer plate, the second middle layer plate, the third middle layer plate, and the fourth middle layer plate are connected in sequence. The first upper layer plate is connected to the third middle layer plate, and the second middle layer plate is connected to the lower layer structure.

[0008] According to one embodiment of this application, a support plate is provided on the side of the upper first plate and the upper third plate away from the middle structure, and a first folding plate is provided on the side of the upper second plate away from the middle structure. After the first folding plate is folded, it abuts against the support plate to stabilize the upper cover structure.

[0009] According to one embodiment of this application, the second and fourth middle layers are provided with inclined plates on the side near the upper structure, and the inclined plates fold up to abut against the inner wall of the third upper layer.

[0010] According to one embodiment of this application, the middle layer 1 plate and the middle layer 3 plate are symmetrically arranged, and the middle layer 1 plate and the middle layer 3 plate are provided with a support 2 plate on the side away from the upper structure. The middle layer 2 plate is provided with a second folding plate on the side away from the upper structure. The support 2 plate and the second folding plate are folded to form the base of the packaging box, and the support 2 plate abuts against the surface of the second folding plate after being folded.

[0011] According to one embodiment of this application, the length of the fixing plate gradually decreases along the width direction, and one side of the fixing plate after being folded up abuts against the surface of the middle three plates to divide the packaging box into two sealed spaces.

[0012] According to one embodiment of this application, an adhesive plate is provided on the side of the middle layer one away from the middle layer two. After being folded, the adhesive plate is fixedly connected to the middle layer four. The length of the adhesive plate is the same as or approximately the same as the length of the middle layer four.

[0013] According to one embodiment of this application, the upper structure further includes an upper fourth plate, which is disposed opposite to the upper second plate on both sides of the upper first plate. The inclined side of the inclined plate near the middle third plate is attached to the upper fourth plate and the upper second plate.

[0014] According to one embodiment provided in this application, the middle layer board is made of transparent plastic. However, the middle layer board may also be made of opaque cardboard.

[0015] Compared with existing technologies, the significant technological advancement of this application lies in the following: In the middle layer structure, the groove formed by the folded fixing plate and the middle layer plate, along with the middle layer three plates, achieves an inward snap-fit ​​opening and closing mechanism. Compared to plug-in or adhesive connections, this structure has a larger contact area and a tighter interlock, effectively preventing accidental opening due to vibration or collision during transportation or display, thus improving the sealing reliability of the packaging box. Furthermore, the opening and closing process requires no additional tools; it can be completed simply by directly snapping / separating the middle layer three plates with the groove. This convenient operation and reusability solve the problem of easily damaged and unreusable adhesive packaging boxes after opening and closing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a packaging box provided in an embodiment of this application;

[0018] Explanation of reference numerals in the attached figures:

[0019] 100 - Upper structure; 110 - Upper layer 1 plate; 120 - Upper layer 2 plate; 130 - Upper layer 3 plate; 140 - Supporting plate 1; 150 - First folding plate; 200 - Middle structure; 210 - Middle layer 1 plate; 211 - Fixing plate; 220 - Middle layer 2 plate; 230 - Middle layer 3 plate; 240 - Middle layer 4 plate; 250 - Inclined plate; 260 - Supporting plate 2; 270 - Second folding plate; 280 - Adhesive plate; 300 - Lower structure.

[0020] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0023] Secondly, it should be noted that in the description of this application, the terms "front", "rear", "left", "right", "up", "down", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0024] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] In the packaging and display of food, daily necessities, and other products, packaging display boxes must simultaneously meet core requirements such as product fixation, convenient opening and closing, and intuitive display. Especially for products with special shapes or that are fragile, such as ice cream cones, the packaging not only needs to securely hold the product from the inside to prevent shaking and damage during transportation or handling, but also needs to have good display functions so that consumers can quickly understand the product's appearance, while also taking into account ease of use to adapt to diverse usage scenarios.

[0027] Currently, most common packaging display boxes on the market adopt an adhesive connection structure. The adhesive structure uses adhesives such as glue to fix and connect the various parts of the box, which can achieve the packaging and basic protection functions of the product to a certain extent and is widely used in packaging scenarios of various products.

[0028] However, while adhesive structures can achieve a tight seal, they are prone to damage during opening and closing, making them unusable and increasing packaging costs and wasting resources.

[0029] This application Figure 1 A structural diagram of a packaging box is provided.

[0030] like Figure 1As shown, a packaging box includes an upper structure 100, a middle structure 200, and a lower structure 300. The two sides of the middle structure 200 are connected to the upper structure 100 and the lower structure 300, respectively. The upper structure 100 includes an upper first plate 110, an upper second plate 120, and an upper third plate 130. The upper first plate 110, the upper second plate 120, and the upper third plate 130 are folded together to form the upper cover of the packaging box. The middle structure 200 includes a middle first plate 210 and a fixing plate 211. The middle first plate 210 is connected to the fixing plate 211. After the fixing plate 211 is folded, a groove is exposed at the connection between the fixing plate 211 and the middle first plate 210. The upper third plate 130 cooperates with the groove to complete the opening and closing of the packaging box.

[0031] It should be noted that in the middle layer structure 200, the groove formed by the folded fixing plate 211 and the middle layer plate 210, together with the upper three plates 130, achieves an inward snap-fit ​​opening and closing. Compared with plug-in or adhesive connections, this structure has a larger contact area and a tighter fit, effectively preventing accidental opening due to vibration or collision during transportation or display, thus improving the sealing reliability of the packaging box. Furthermore, the opening and closing process requires no additional tools; it can be completed simply by directly snapping / separating the upper three plates 130 with the groove. This convenient operation and reusability solve the problem of easily damaged and unreusable adhesive packaging boxes after opening and closing.

[0032] It should also be noted that the upper structure 100 is formed by folding and surrounding the upper first plate 110, upper second plate 120 and upper third plate 130 to form an upper cover, which can not only form a closed protection for the top of the product to prevent dust and impurities from entering; if the upper second plate 120 or the upper third plate 130 is made of transparent material, the appearance of the product can be directly displayed through the upper cover, allowing consumers to clearly observe the product's shape, color and other characteristics without opening the packaging box, thus improving the convenience and attractiveness of product display.

[0033] The upper structure 100, middle structure 200, and lower structure 300 are connected by folding to form an overall frame. The folding relationship between each panel eliminates the need for additional connectors during assembly. Fixing can be completed solely through the folding and interlocking of the structure itself, which not only reduces assembly costs but also ensures the consistency and stability of the overall structure. At the same time, each panel can be made of common materials such as white cardboard and kraft paper, which are widely available and inexpensive, making them suitable for large-scale production.

[0034] According to one embodiment of this application, the middle layer structure 200 further includes a middle layer three plate 230. After being folded, the middle layer three plate 230 is arranged opposite to the middle layer one plate 210. An arc-shaped groove is formed on the fixing plate 211. The arc-shaped groove cooperates with the middle layer three plate 230 to fix and hold the contents of the packaging box.

[0035] It should be noted that the arc-shaped groove on the fixing plate 211 can conform to the shape of curved contents such as ice cream cones. Together with the middle three plates 230, which are positioned opposite the middle one plate 210 after being folded, they form a wrap-around clamping effect on the contents. The arc-shaped groove increases the contact area with the contents by conforming to the shape, reducing deformation or damage caused by local compression. The opposing arrangement of the middle three plates 230 provides stable support from the other side, effectively preventing the contents from rolling or shifting inside the box. Especially for fragile products such as ice cream cones, it can avoid problems such as the brittle shell breaking due to shaking, thus enhancing the reliability of internal fixation.

[0036] Furthermore, the middle three-plate 230 not only participates in clamping and securing the contents, but also functions as part of the structure to facilitate opening and closing. During the opening or closing of the packaging box, the arc-shaped groove and the middle three-plate 230 maintain a stable clamping state on the contents, preventing the contents from loosening or falling due to structural movement, thus ensuring product safety during operation and meeting the dual requirements of convenient opening and closing and protection of the contents.

[0037] According to one embodiment provided in this application, the middle layer structure 200 further includes a middle layer second plate 220 and a middle layer fourth plate 240. The middle layer first plate 210, the middle layer second plate 220, the middle layer third plate 230 and the middle layer fourth plate 240 are connected in sequence. The upper layer first plate 110 is connected to the middle layer third plate 230, and the middle layer second plate 220 is connected to the lower layer structure 300.

[0038] It should be noted that the middle layer 1 panel 210, middle layer 220, middle layer 3 panel 230, and middle layer 4 panel 240 are connected sequentially to form a continuous folding frame, which works in conjunction with the connection between the upper layer 1 panel 110 and the middle layer 3 panel 230, and the connection between the middle layer 2 panel 220 and the lower structure 300. This sequential connection design allows for more even stress distribution on each panel, dispersing external pressure on the packaging box during transportation, stacking, or display, reducing the risk of localized deformation. Compared to independent and dispersed panel structures, the overall bending and compression resistance is significantly improved, ensuring that the packaging box maintains its shape integrity even after multiple uses or external forces.

[0039] Furthermore, the upper layer 110 is connected to the middle layer 3 230, and the middle layer 220 is connected to the lower structure 300, so that the opening and closing action of the upper structure 100 can drive the entire middle structure 200 to move synchronously through the middle layer 3 230, while the connection between the middle layer 220 and the lower layer provides a stable fulcrum for this linkage.

[0040] Furthermore, the sequentially connected four middle-layer plates form a surrounding support space, which, together with the clamping structure of the arc-shaped groove of the middle-layer third plate 230 and the fixing plate 211, can form multi-dimensional lateral constraints in the horizontal direction. For ice cream cone-type contents, the relative clamping of the middle-layer first plate 210 and the middle-layer third plate 230, and the lateral support of the middle-layer second plate 220 and the middle-layer fourth plate 240, form a "front-back, left-right" surrounding fixation, further reducing the amount of shaking of the contents in the box and reducing the risk of collision damage caused by bumps during transportation or carrying.

[0041] According to one embodiment of this application, a support plate 140 is provided on the side of the upper plate 110 and the upper plate 3 130 away from the middle structure 200, and a first folding plate 150 is provided on the side of the upper plate 2 120 away from the middle structure 200. After the first folding plate 150 is folded, it abuts against the support plate 140 to stabilize the upper cover structure.

[0042] It should be noted that the supporting plate 140 of the upper first plate 110 and the upper third plate 130, together with the first folding plate 150 of the upper second plate 120, form an abutting fit after folding, which can effectively disperse the external force on the upper cover. This structure can prevent the upper cover from collapsing, deforming, or lifting at the edges due to external forces, ensuring that the upper cover always maintains a regular shape, which meets the core requirement of "structural stability" for inset packaging.

[0043] Furthermore, the robust upper cap structure provides continuous and even support and protection for the internal product. Even if the packaging box is subjected to bumps or pressure, the abutting fit between the support plate 140 and the first folding plate 150 reduces the deformation space of the upper cap, preventing the contents from being directly compressed due to the cap collapsing, reducing the risk of product damage, and enhancing the packaging's protection of the contents.

[0044] According to one embodiment of this application, an inclined plate 250 is provided on the side of the middle layer second plate 220 and the middle layer fourth plate 240 near the upper structure 100. After being folded, the inclined plate 250 abuts against the inner wall of the upper layer third plate 130.

[0045] It should be noted that after the inclined plate 250 is folded, it abuts against the inner wall of the upper three-plate 130, forming a "lateral bracing" structure between the middle structure 200 and the upper structure 100, providing additional upward support for the upper structure 100. This support can effectively disperse the pressure on the upper structure 100 during stacking, handling, or being pressed by external forces, preventing the upper three-plate 130 from denting inward or warping outward due to excessive force, further reinforcing the overall shape of the upper cover, and ensuring that the packaging box maintains its structural integrity even after multiple uses or external forces.

[0046] Furthermore, the contact relationship between the inclined plate 250 and the inner wall of the upper three plates 130 can be used as a concealed guide rail during the opening and closing of the packaging box. When opening, the upper structure 100 flips upward, and the contact point between the inclined plate 250 and the upper three plates 130 slides along the incline, providing a stable trajectory for the flipping of the upper structure and avoiding jamming or misalignment caused by uneven force when the plates are linked. When closing, the tilt angle of the inclined plate 250 can guide the upper three plates 130 to return to their natural position, reducing the need for alignment adjustments and making the opening and closing process smoother.

[0047] According to one embodiment of this application, the middle layer 1 plate 210 and the middle layer 3 plate 230 are symmetrically arranged, and a support 2 plate 260 is provided on the side of the middle layer 1 plate 210 and the middle layer 3 plate 230 away from the upper structure 100. A second folding plate 270 is provided on the side of the middle layer 2 plate 220 away from the upper structure 100. The support 2 plate 260 and the second folding plate 270 are folded to form the base of the packaging box, and the support 2 plate 260 abuts against the surface of the second folding plate 270 after being folded.

[0048] It should be noted that the symmetrical arrangement of the middle layer 1 plate 210 and the middle layer 3 plate 230 ensures more even force distribution on both sides of the packaging box, avoiding tilting caused by uneven weight distribution on one side and providing a symmetrical support foundation for the overall structure. Furthermore, the base formed by the folding of the second support plate 260 and the second folding plate 270 increases the contact area with the placement surface, further lowering the center of gravity of the packaging box. Combined with the rigid support structure formed by the contact between the folded second support plate 260 and the surface of the second folding plate 270, this effectively resists shaking caused by external forces, ensuring the packaging box remains stable during display or placement.

[0049] Furthermore, the abutting fit between the second support plate 260 and the second folding plate 270 significantly improves its bending strength. When heavy contents are placed inside the packaging box or when it is subjected to stacking pressure, the interaction force at the abutting point can disperse the pressure, preventing the base from collapsing, bending, or warping at the edges due to excessive force. This ensures that the base maintains its regular shape over a long period of time, providing stable support for the upper and middle layers of the structure and indirectly enhancing the protection of the internal contents.

[0050] Furthermore, the sturdy base structure provides reliable support for the display function of the packaging box, and can avoid problems such as tilting of the display surface, exposure of contents, or obstruction caused by base deformation even during long-term display.

[0051] According to one embodiment of this application, the length of the fixing plate 211 gradually decreases along the width direction, and one side of the fixing plate 211 after being folded abuts against the surface of the middle three-layer plate 230 to divide the packaging box into two sealed spaces.

[0052] It should be noted that the gradual reduction in length along the width of the fixed plate 211 allows it to fold over and form a tight, inclined contact with the surface of the middle three-layer plate 230. This rigid contact effectively blocks airflow and material exchange between the two compartments, creating independent, sealed areas. This structure is particularly suitable for items requiring categorized storage, preventing odor mixing, moisture migration, or debris contamination, and ensuring an independent storage environment for each area.

[0053] According to one embodiment of this application, an adhesive plate 280 is provided on the side of the middle layer 1 plate 210 away from the middle layer 220. After being folded, the adhesive plate 280 is fixedly connected to the middle layer 4 plate 240. The length of the adhesive plate 280 is the same as or approximately the same as the length of the middle layer 4 plate 240.

[0054] It should be noted that after the adhesive plate 280 is folded, it is fixedly connected to the fourth middle layer plate 240, and the two are of the same or nearly the same length. This allows a full-length closed connection to be formed at the end of the middle layer structure 200, so that the first middle layer plate 210, the second middle layer plate 220, the third middle layer plate 230, and the fourth middle layer plate 240 can enclose a complete closed frame. Compared with partial adhesion, this full-length connection method has a larger contact area and higher connection strength. It can effectively resist the lateral tension of the packaging box when it is opened, closed, transported, or stacked, and prevent the middle layer structure from developing gaps or falling apart due to stress. It also works synergistically with the sequential connection of the middle layer plates to further strengthen the overall rigidity of the middle layer structure.

[0055] According to one embodiment of this application, the upper structure 100 further includes an upper fourth plate 160, which is disposed opposite to the upper second plate 120 on both sides of the upper first plate 110. The inclined side of the inclined plate 250 near the middle third plate 230 is attached to the upper fourth plate 160 and the upper second plate 120.

[0056] It should be noted that the upper fourth plate 160 and the upper second plate 120 are positioned opposite each other, and together with the beveled edge of the inclined plate 250, they form a support between the middle and upper layers. The beveled edge of the inclined plate 250, when attached to the two plates, increases the contact area, allowing the external force on the upper structure 100 to be transferred to the middle structure 200 through the bonding surface, dispersing the localized stress and preventing the upper fourth plate 160 or the upper second plate 120 from denting inward or warping outward due to excessive stress on either one. This further reinforces the regular shape of the upper end cap, ensuring that the packaging box maintains structural stability even after repeated use or under external force.

[0057] According to one embodiment provided in this application, the middle layer 210 part of the structure is made of transparent plastic material. The middle layer 210 part of the structure involved in this application can also be made of opaque cardboard material.

[0058] It should be noted that the transparent plastic part of the middle layer 210 can directly show the shape and decorative details of the contents, such as the ice cream cone, allowing consumers to observe the product without opening the packaging box. The part made of opaque cardboard provides rigid support for the middle layer structure and resists external forces such as squeezing and collision.

[0059] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0060] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A packaging box, characterized in that, It includes an upper structure (100), a middle structure (200), and a lower structure (300). The two sides of the middle structure (200) are connected to the upper structure (100) and the lower structure (300), respectively. The upper structure (100) includes an upper first plate (110), an upper second plate (120), and an upper third plate (130). The upper first plate (110) is connected to the upper second plate (120) and the upper third plate (300). 130) The upper cover of the packaging box is formed by folding and surrounding. The middle layer structure (200) includes a middle layer plate (210) and a fixing plate (211). The middle layer plate (210) is connected to the fixing plate (211). After the fixing plate (211) is folded, a groove is exposed at the connection between the fixing plate (211) and the middle layer plate (210). The upper three plates (130) cooperate with the groove to complete the opening and closing of the packaging box.

2. The packaging box according to claim 1, characterized in that, The middle layer structure (200) also includes a middle layer three plate (230), which is folded over and positioned opposite to the middle layer one plate (210). An arc-shaped groove is formed on the fixing plate (211), which cooperates with the middle layer three plate (230) to fix and hold the contents of the packaging box.

3. A packaging box according to claim 2, characterized in that, The middle layer structure (200) further includes a second middle layer plate (220) and a fourth middle layer plate (240). The first middle layer plate (210), the second middle layer plate (220), the third middle layer plate (230) and the fourth middle layer plate (240) are connected in sequence. The first upper layer plate (110) is connected to the third middle layer plate (230), and the second middle layer plate (220) is connected to the lower layer structure (300).

4. A packaging box according to claim 3, characterized in that, The upper plate (110) and the upper plate (130) are provided with a support plate (140) on the side away from the middle structure (200), and the upper plate (120) is provided with a first folding plate (150) on the side away from the middle structure (200). After the first folding plate (150) is folded, it abuts against the support plate (140) to stabilize the upper end cover structure.

5. A packaging box according to claim 3, characterized in that, The middle layer second plate (220) and the middle layer fourth plate (240) are provided with inclined plates (250) on the side near the upper structure (100). After the inclined plates (250) are folded, they abut against the inner wall of the upper layer third plate (130).

6. A packaging box according to claim 3, characterized in that, The middle layer plate 1 (210) and the middle layer plate 3 (230) are symmetrically arranged, and a support plate 260 is provided on the side of the middle layer plate 1 (210) and the middle layer plate 3 (230) away from the upper structure (100). A second folding plate (270) is provided on the side of the middle layer plate 2 (220) away from the upper structure (100). The support plate 260 and the second folding plate (270) are folded to form the base of the packaging box, and the support plate 260 abuts against the surface of the second folding plate (270) after being folded.

7. A packaging box according to claim 6, characterized in that, The length of the fixing plate (211) gradually decreases along the width direction, and one side of the fixing plate (211) after being folded up abuts against the surface of the middle three-layer plate (230) to divide the packaging box into two sealed spaces.

8. A packaging box according to claim 3, characterized in that, An adhesive plate (280) is provided on the side of the middle layer plate (210) away from the middle layer plate (220). The adhesive plate (280) is folded over and fixedly connected to the middle layer plate (240). The length of the adhesive plate (280) is the same as or approximately the same as the length of the middle layer plate (240).

9. A packaging box according to claim 5, characterized in that, The upper structure (100) also includes an upper four plate (160), which is disposed opposite to the upper two plate (120) on both sides of the upper one plate (110). The inclined plate (250) has its inclined side close to the middle three plate (230) in contact with the upper four plate (160) and the upper two plate (120).

10. A packaging box according to any one of claims 1-9, characterized in that, The middle layer (210) is made of transparent plastic, and / or the middle layer (210) is made of opaque cardboard.

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