Paperboard lining structure and packaging box thereof

Abstract

The utility model discloses a paperboard lining structure and a packaging box thereof, the paperboard lining structure comprises a bottom plate and a plurality of surrounding plates, and the bottom plate is of a polygonal structure; the multiple surrounding plates are connected with the multiple edges of the bottom plate in a one-to-one correspondence mode. Wherein a first fold line is arranged at the joint of each coaming and the bottom plate, two first notches crossed with the first fold lines are arranged between at least one coaming and the bottom plate, the two first notches are arranged in parallel, and the connecting lines of the two corresponding ends of the two first notches form second fold lines, so that when the coamings are bent along the first fold lines, the second fold lines are bent along the first fold lines. According to the paperboard lining structure, the requirement for green, plastic-free and environment-friendly export packaging is met, meanwhile, due to the fact that the paperboard lining structure is formed by folding the integrated structure, the number of packaging materials is reduced, the packaging cost is reduced, and the packaging efficiency is improved. And adverse factors such as packaging operation and management of material codes are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging materials, in particular to a paperboard lining structure and a packaging box body thereof. Background Art

[0002] At present, countries such as France, Australia, and Spain have successively issued foam ban requirements, requiring the development of new foam-free plastic packaging for export products to meet market demand. For example, France: It is stipulated that from January 1, 2025, packaging made of styrene polymers or copolymers in whole or in part will be prohibited. These materials are not recyclable and cannot enter the recycling channel. Australia: Products below 45KG will gradually eliminate foam packaging, with a transition period before July 2025, and then it will be implemented.

[0003] The existing product packaging design basically adopts the packaging foam and packaging box separation, or the pearl cotton pad and packaging box separation packaging, which has the problems of large number of materials, cumbersome assembly operation and high comprehensive cost. For example, the pad and packaging box in the designs of patents 201510790688.2 and 201920706717.6 are packaged separately, and the packaging box contains packaging materials such as packaging pad (bottom) and packaging pad (top), which have large number, cumbersome packaging operation, and material coding management.

[0004] After investigation, it was found that there is no feasible mature green and environmentally friendly packaging on the market to meet the requirements of green, plastic-free and environmentally friendly export packaging. Utility Model Content

[0005] The utility model aims to provide a cardboard lining structure and a packaging box thereof, aiming to solve the technical problem in the related art that the lining cannot meet the requirements of green plastic-free and environmentally friendly export packaging.

[0006] In order to solve the above problems, according to one aspect of the present application, the embodiment of the utility model provides a paperboard lining structure, and the paperboard lining structure includes:

[0007] The bottom plate is a polygonal structure;

[0008] A plurality of enclosures are connected to the plurality of edges of the bottom plate in a one-to-one correspondence, and two adjacent enclosures are connected to each other;

[0009] Among them, a first fold line is arranged at the connection point between each of the enclosures and the bottom plate, and two first incisions intersecting with the first fold line are arranged between at least one of the enclosures and the bottom plate. The two first incisions are arranged in parallel, and the connecting lines at the two corresponding ends of the two first incisions are both constructed as second fold lines, so that when the enclosure is bent along the first fold line, the area between the two first incisions is bent along the two second fold lines to bulge toward one side of the bottom plate to form a first limiting structure.

[0010] In some embodiments, the bottom plate is square or rectangular, and there are four enclosing plates; and / or, two first cuts are provided between at least a pair of oppositely arranged enclosing plates and the bottom plate to form a pair of oppositely arranged first limiting structures.

[0011] In some embodiments, the first cut is perpendicular to the first broken line intersecting therewith, and the second broken line is perpendicular to the first cut connected thereto.

[0012] In some embodiments, at least one of the enclosing plates is configured with a first overlapping portion extending towards the adjacent enclosing plate. A third broken line is provided at the connection between the first overlapping portion and the enclosing plate connected thereto, and the first overlapping portion is arranged in a fitting manner with the adjacent enclosing plate.

[0013] In some embodiments, each enclosing plate is configured with a fourth broken line, and the fourth broken line is parallel to the side of the bottom plate connected thereto. Two second cuts are provided between at least one of the enclosing plates and the bottom plate connected thereto. The two second cuts are arranged in a crosswise manner with the fourth broken line. The two second cuts are arranged in parallel, and the connecting lines of the corresponding two ends of the two second cuts are both configured as fifth broken lines. When the enclosing plate is bent along the fourth broken line, the area between the two second cuts is bent along the two fifth broken lines to bulge towards the bottom plate side to form a second limiting structure.

[0014] In some embodiments, the two second cuts are perpendicular to the fourth broken line intersecting therewith, and the fifth broken line is perpendicular to the second cut connected thereto.

[0015] In some embodiments, two second cuts are provided on at least a pair of oppositely arranged enclosing plates to form a pair of oppositely arranged second limiting structures.

[0016] In some embodiments, the part of the enclosing plate away from the bottom plate along the fourth broken line is a second overlapping portion. At least part of the adjacent two second overlapping portions are overlapped, and an insertion locking structure capable of inserting and locking the second overlapping portion on at least one enclosing plate and the second overlapping portion on the adjacent enclosing plate is provided.

[0017] In some embodiments, the insertion locking structure includes an insertion hole opened on at least one of the second overlapping portions, and a T-shaped insertion portion formed by cutting on the adjacent second overlapping portion and locked with the insertion hole. The bottom of the T-shaped insertion portion is connected to the second overlapping portion, and the width of the head of the T-shaped insertion portion is greater than the width of the insertion hole.

[0018] According to another aspect of the present application, an embodiment of the present utility model further provides a packaging box body, and the packaging box body includes the cardboard lining structure as described above.

[0019] Compared with the prior art, the cardboard lining structure of the present utility model has at least the following beneficial effects:

[0020] An embodiment of the present utility model discloses a cardboard lining structure, which includes a bottom plate and a plurality of surrounding plates. The bottom plate is a polygonal structure; the plurality of surrounding plates are connected to the plurality of sides of the bottom plate one by one; wherein, a first folding line is provided at the connection between each surrounding plate and the bottom plate, and at least one surrounding plate and the bottom plate are provided with two first cuts that intersect with the first folding line. The two first cuts are arranged in parallel, and the connection lines of the two opposite ends of the two first cuts are all constructed as second folding lines. When the surrounding plate is bent along the first folding line, the area between the two first cuts is bent along the two second folding lines to protrude towards the bottom plate side to form a first limiting structure. After the cardboard lining structure is folded and assembled, the product is placed in the space surrounded by the bottom plate and the plurality of surrounding plates. Since the first limiting structure is located in this space, it can prevent the product from shaking in this space. When two first cuts that intersect with the first folding line are provided between all the surrounding plates and the bottom plate, the two first cuts are arranged in parallel, and the connection lines of the two opposite ends of the two first cuts are all constructed as second folding lines, so that the area between the two first cuts is bent along the two second folding lines to protrude towards the bottom plate side to form a plurality of first limiting structures corresponding to the plurality of surrounding plates one by one. The plurality of first limiting structures can prevent the product from moving back and forth, left and right in this space and prevent the product from shaking in this space.

[0021] The cardboard lining structure of the present utility model meets the requirements of green plastic-free environmental protection export packaging. At the same time, since the cardboard lining structure is folded from an integral structure, it reduces the quantity of packaging materials and simplifies the unfavorable factors such as packing operations and material coding management.

[0022] On the other hand, the packaging box body provided by the present utility model is manufactured based on the above cardboard lining structure. For its beneficial effects, refer to the beneficial effects of the above cardboard lining structure, which will not be elaborated here one by one.

[0023] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present utility model and combines with the drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is the unfolded structural schematic diagram of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0026] Figure 2 It is the folded structural schematic diagram of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0027] Figure 3 It is the folded structural schematic diagram of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0028] Figure 4 It is the folded structural schematic diagram of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0029] Figure 5 It is the folded structural schematic diagram of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0030] Figure 6 It is the folded structural schematic diagram of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0031] Figure 7 It is the structural schematic diagram of the T-shaped insertion part of the cardboard inner lining structure provided by the embodiment of the present utility model;

[0032] Figure 8 It is the structural schematic diagram of the insertion hole of the cardboard inner lining structure provided by the embodiment of the present utility model.

[0033] Explanation of reference numerals:

[0034] 1. Bottom plate; 11. First folding line;

[0035] 2. Enclosing plate; 21. First cut; 22. Second folding line; 23. First limiting structure; 24. First overlapping part; 25. Third folding line; 26. Fourth folding line; 27. Second cut; 28. Fifth folding line; 29. Second limiting structure; 30. Second overlapping part; 301. Insertion hole; 302. T-shaped insertion part. Detailed implementation manners

[0036] To further elaborate on the technical means and effects adopted by the present utility model to achieve the intended utility model purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects of the application based on the present utility model. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0037] In the description of the present utility model, it should be clear that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence; the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model, rather than meaning that the indicated device or element must have a specific orientation or position, so it cannot be understood as a limitation to the present utility model.

[0038] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] As Figure 1-8 shown, the embodiment of the present utility model provides a cardboard inner lining structure, and the cardboard inner lining structure includes:

[0041] A bottom plate 1, which is a polygonal structure;

[0042] A plurality of enclosing plates 2, which are connected to the plurality of sides of the bottom plate 1 one by one, and adjacent two enclosing plates 2 are connected;

[0043] Wherein, a first folding line 11 is provided at the connection between each enclosing plate 2 and the bottom plate 1, and at least one enclosing plate 2 and the bottom plate 1 are provided with two first cuts 21 that intersect with the first folding line 11. The two first cuts 21 are arranged in parallel, and the connection lines of the two opposite ends of the two first cuts 21 are all constructed as second folding lines 22, so that when the enclosing plate 2 is bent along the first folding line 11, the area between the two first cuts 21 is bent along the two second folding lines 22 to bulge toward the side of the bottom plate 1 to form a first limiting structure 23.

[0044] In this embodiment, the cardboard inner lining structure includes a bottom plate 1 and a plurality of surrounding plates 2. The bottom plate 1 is a polygonal structure; the plurality of surrounding plates 2 are connected to the corresponding sides of the bottom plate 1 one by one, and two adjacent surrounding plates 2 are connected to each other; wherein, a first fold line 11 is provided at the connection between each surrounding plate 2 and the bottom plate 1, and at least one surrounding plate 2 and the bottom plate 1 are provided with two first cuts 21 that intersect with the first fold line 11. The two first cuts 21 are arranged in parallel, and the connecting lines of the corresponding ends of the two first cuts 21 are all constructed as second fold lines 22. When the surrounding plate 2 is bent along the first fold line 11, the area between the two first cuts 21 is bent along the two second fold lines 22 to bulge towards the side of the bottom plate 1 to form a first limiting structure 23. After the cardboard inner lining structure is folded and assembled, the product is placed in the space surrounded by the bottom plate 1 and the plurality of surrounding plates 2. Since the first limiting structure 23 is located in this space, it can prevent the product from shaking in this space. When two first cuts 21 that intersect with the first fold line 11 are provided between all the surrounding plates 2 and the bottom plate 1, the two first cuts 21 are arranged in parallel, and the connecting lines of the corresponding ends of the two first cuts 21 are all constructed as second fold lines 22, so that the area between the two first cuts 21 is bent along the two second fold lines 22 to bulge towards the side of the bottom plate 1 to form a plurality of first limiting structures 23 corresponding to the plurality of surrounding plates 2 one by one. The plurality of first limiting structures 23 can prevent the product from moving back and forth, left and right in this space and prevent the product from shaking in this space.

[0045] The cardboard inner lining structure of this embodiment meets the requirements of green plastic-free environmental protection for export packaging. At the same time, since the cardboard inner lining structure is folded from an integral structure, it reduces the quantity of packaging materials and simplifies the unfavorable factors such as packing operations and material coding management.

[0046] The green plastic-free packaging solution of this embodiment can meet the requirements of environmental protection regulations in the export destination, enabling the product to enter the local market for sale. The selected packaging cardboard is designed to be integrally formed, reducing adhesives and improving production efficiency. At the same time, the buffer cardboard structure around after forming can withstand static pressure and impact force from the side, ensuring the product's drop impact requirements during turnover.

[0047] This embodiment uses the flap structure on the packaging box to be folded and formed into a limiting structure, which can limit and fix the product well, avoiding the product from moving around randomly in the packaging box; the traditional foam separated packing is designed as an integrated packing, which can reduce the use of materials such as foam and padding inside the packaging box.

[0048] This embodiment designs a new packaging design with an integrated inner packaging material, which can replace the existing separate foam packaging and packing method. By using this integrated folding structure, it is possible to achieve no need to additionally increase the lining material and low packaging cost, realize a simple integration in the assembly process, and ultimately meet the requirements of green plastic-free environmental protection for export packaging.

[0049] The first limiting structure 23 can also be used to place product accessories, saving space, shortening the product packaging size, and reducing related costs.

[0050] In some embodiments, the bottom plate 1 is square or rectangular, and there are four surrounding plates 2.

[0051] In this embodiment, since more products can be in a square shape in actual use, in this embodiment, the bottom plate 1 is square or rectangular, and there are four surrounding plates 2, which can be applied to the packaging of square products, improving the versatility of the products.

[0052] In some embodiments, two of the first incisions 21 are provided between at least a pair of oppositely arranged surrounding plates 2 and the bottom plate 1 to form a pair of oppositely arranged first limiting structures 23.

[0053] In this embodiment, by providing two of the first incisions 21 between at least a pair of oppositely arranged surrounding plates 2 and the bottom plate 1 to form a pair of oppositely arranged first limiting structures 23, the products are prevented from shaking between a pair of oppositely arranged surrounding plates 2 through the pair of oppositely arranged first limiting structures 23, improving the stability of product packaging.

[0054] In some embodiments, the first incision 21 is perpendicular to the first folding line 11 that intersects it, and the second folding line 22 is perpendicular to the first incision 21 connected thereto.

[0055] In this embodiment, the first incision 21 is perpendicular to the first folding line 11 that intersects it, and the second folding line 22 is perpendicular to the first incision 21 connected thereto, enabling the first limiting structure 23 to be folded into an inner empty square structure.

[0056] In some embodiments, at least one of the surrounding plates 2 is constructed with a first overlapping portion 24 extending towards the adjacent surrounding plate 2. A third folding line 25 is provided at the connection between the first overlapping portion 24 and the surrounding plate 2 connected thereto, and the first overlapping portion 24 is arranged in a fitting manner with the adjacent surrounding plate 2.

[0057] In this embodiment, at least one of the enclosing plates 2 is configured with a first overlapping portion 24 extending towards the adjacent enclosing plate 2. A third fold line 25 is provided at the connection between the first overlapping portion 24 and the enclosing plate 2 connected thereto. The first overlapping portion 24 and the adjacent enclosing plate 2 are arranged in a fitting manner, which can make the adjacent two enclosing plates 2 closely connected and prevent the cardboard lining structure from deforming.

[0058] In some embodiments, each of the enclosing plates 2 is configured with a fourth fold line 26, and the fourth fold line 26 is parallel to the side of the bottom plate 1 connected thereto. There are two second cutouts 27 provided between at least one of the enclosing plates 2 and the bottom plate 1 connected thereto. The two second cutouts 27 are arranged in a crosswise manner with the fourth fold line 26. The two second cutouts 27 are parallel to each other, and the connecting lines of the corresponding two ends of the two second cutouts 27 are both configured as a fifth fold line 28. When the enclosing plate 2 is bent along the fourth fold line 26, the area between the two second cutouts 27 is bent along the two fifth fold lines 28 to bulge towards the bottom plate 1 side to form a second limiting structure 29.

[0059] Since the first limiting structure 23 limits the bottom of the product, it cannot limit the top of the product.

[0060] In this embodiment, by configuring a fourth fold line 26 on each enclosing plate 2, the fourth fold line 26 is parallel to the side of the bottom plate 1 connected thereto, and two second cutouts 27 are provided between at least one of the enclosing plates 2 and the bottom plate 1 connected thereto. The two second cutouts 27 are arranged in a crosswise manner with the fourth fold line 26. The two second cutouts 27 are parallel to each other, and the connecting lines of the corresponding two ends of the two second cutouts 27 are both configured as a fifth fold line 28. When the enclosing plate 2 is bent along the fourth fold line 26, the area between the two second cutouts 27 is bent along the two fifth fold lines 28 to bulge towards the bottom plate 1 side to form a second limiting structure 29. By bulging to form the second limiting structure 29 to limit the top of the product, the cardboard lining structure is improved.

[0061] When two second cutouts 27 that are crosswise arranged with the fourth fold line 26 are provided between all the enclosing plates 2 and the bottom plates 1 connected thereto, the two second cutouts 27 are parallel to each other, and the connecting lines of the corresponding two ends of the two second cutouts 27 are both configured as a fifth fold line 28. When the enclosing plate 2 is bent along the fourth fold line 26, the area between the two second cutouts 27 is bent along the two fifth fold lines 28 to bulge towards the bottom plate 1 side to form a plurality of second limiting structures 29 corresponding to the plurality of enclosing plates 2 one by one. The plurality of second limiting structures 29 can prevent the top of the product from moving back and forth, left and right in this space and prevent the product from shaking in this space.

[0062] In some embodiments, the two second incisions 27 are perpendicular to the fourth fold line 26 intersecting therewith, and the fifth fold line 28 is perpendicular to the second incision 27 connected thereto.

[0063] In this embodiment, the two second incisions 27 are perpendicular to the fourth fold line 26 intersecting therewith, and the fifth fold line 28 is perpendicular to the second incision 27 connected thereto, so that the second limiting structure 29 can be folded into an inner-empty square structure.

[0064] In some embodiments, two second incisions 27 are provided on at least one pair of oppositely arranged side plates 2 to form a pair of oppositely arranged second limiting structures 29.

[0065] In this embodiment, by providing two second incisions 27 on at least one pair of oppositely arranged side plates 2 to form a pair of oppositely arranged second limiting structures 29, the pair of oppositely arranged second limiting structures 29 are used to prevent the product from shaking between the pair of oppositely arranged side plates 2, thereby improving the stability of the product packaging.

[0066] In some embodiments, the part of the side plate 2 located away from the bottom plate 1 along the fourth fold line 26 is a second overlapping portion 30. At least a part of adjacent second overlapping portions 30 overlap each other, and an insertion locking structure capable of inserting and locking the second overlapping portion 30 on at least one side plate 2 and the second overlapping portion 30 on the adjacent side plate 2 is provided therebetween.

[0067] In this embodiment, since the part of the side plate 2 located away from the bottom plate 1 along the fourth fold line 26 is a second overlapping portion 30, at least a part of adjacent second overlapping portions 30 overlap each other, and an insertion locking structure capable of inserting and locking the second overlapping portion 30 on at least one side plate 2 and the second overlapping portion 30 on the adjacent side plate 2 is provided therebetween. This can make adjacent side plates 2 closely connected to prevent the cardboard inner lining structure from deforming.

[0068] In some embodiments, the insertion locking structure includes an insertion hole 301 formed in at least one second overlapping portion 30 and a T-shaped insertion portion 302 formed by cutting in the adjacent second overlapping portion 30 and locked with the insertion hole 301. The bottom of the T-shaped insertion portion 302 is connected to the second overlapping portion 30, and the width of the head of the T-shaped insertion portion 302 is greater than the width of the insertion hole 301.

[0069] In this embodiment, by locking the insertion hole 301 with the T-shaped insertion part 302, two adjacent enclosing plates 2 can be closely connected to prevent the deformation of the cardboard lining structure. Among them, the bottom of the T-shaped insertion part 302 is connected to the second overlapping part 30, and the width H1 of the head of the T-shaped insertion part 302 is greater than the width H2 of the insertion hole 301 to prevent the T-shaped insertion part 302 from unlocking from the insertion hole 301.

[0070] In addition, lining plates can also be provided at the top and bottom of the cardboard lining structure.

[0071] Embodiment 2

[0072] The embodiment of the present invention also provides a packaging box body, and the packaging box body includes the cardboard lining structure of Embodiment 1.

[0073] In summary, those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the above-described devices, apparatuses, and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0074] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cardboard lining structure, characterized in that: The paperboard lining structure comprises: The bottom plate is a polygonal structure; A plurality of enclosures are connected to the plurality of edges of the bottom plate in a one-to-one correspondence, and two adjacent enclosures are connected to each other; Among them, a first fold line is arranged at the connection point between each of the enclosures and the bottom plate, and two first incisions intersecting with the first fold line are arranged between at least one of the enclosures and the bottom plate. The two first incisions are arranged in parallel, and the connecting lines at the two corresponding ends of the two first incisions are both constructed as second fold lines, so that when the enclosure is bent along the first fold line, the area between the two first incisions is bent along the two second fold lines to bulge toward one side of the bottom plate to form a first limiting structure.

2. The paperboard lining structure according to claim 1, characterized in that: The bottom plate is square or rectangular, and there are four enclosures; and / or, two first cutouts are provided between at least one pair of oppositely disposed enclosures and the bottom plate to form a pair of oppositely disposed first limiting structures.

3. The paperboard lining structure according to claim 1 or 2, characterized in that: The first incision is perpendicular to the first fold line intersecting therewith, and the second fold line is perpendicular to the first incision connected thereto.

4. The paperboard lining structure according to claim 1 or 2, characterized in that: At least one of the enclosures is constructed with a first overlapping portion extending toward the enclosure adjacent thereto, a third fold line is provided at the connection between the first overlapping portion and the enclosure connected thereto, and the first overlapping portion and the enclosure adjacent thereto are arranged in close contact with each other.

5. The paperboard lining structure according to claim 1 or 2, characterized in that: A fourth fold line is constructed on each of the enclosures, and the fourth fold line is parallel to the edge of the base plate connected to it. Two second incisions are arranged between at least one of the enclosures and the base plate connected to it, and the two second incisions are arranged to cross the fourth fold line, and the two second incisions are arranged in parallel, and the connecting lines at the corresponding ends of the two second incisions are constructed as fifth fold lines, so that when the enclosure is bent along the fourth fold line, the area between the two second incisions is bent along the two fifth fold lines to protrude toward one side of the base plate to form a second limiting structure.

6. The paperboard lining structure according to claim 5, characterized in that: The two second incisions are perpendicular to the fourth fold lines intersecting therewith, and the fifth fold line is perpendicular to the second incision connected thereto.

7. The paperboard lining structure according to claim 5, characterized in that: At least one pair of the oppositely disposed enclosures are each provided with two second cutouts to form a pair of oppositely disposed second limiting structures.

8. The paperboard lining structure according to claim 5, characterized in that: The portion of the enclosure located on the fourth fold line away from the bottom plate is the second overlapping portion, and two adjacent second overlapping portions are at least partially overlapped, and a plug-in locking structure capable of plugging the two together is provided between the second overlapping portion on at least one of the enclosures and the second overlapping portion on the adjacent enclosure.

9. The paperboard lining structure according to claim 8, characterized in that: The plug-in locking structure includes an insertion hole opened on at least one of the second overlapping parts, and a T-shaped plug-in part cut on the second overlapping part adjacent to it to be plugged into the insertion hole, the bottom of the T-shaped plug-in part is connected to the second overlapping part, and the width of the head of the T-shaped plug-in part is greater than the width of the insertion hole.

10. A packaging box, characterized in that: The packaging box body comprises the paperboard lining structure according to any one of claims 1-9.

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