A double-layered packaging box

Abstract

The utility model provides a kind of integrated double-layer packaging box, from top to bottom sequentially include: upper cover, upper layer box body, lower layer box body, all surface body in upper cover, upper layer box body, lower layer box body are located on same die blank and are separated by fold line;Upper layer box body, lower layer box body all have bottom surface and four peripheral side, upper layer bottom surface is covered in the upper layer box body by folding, and upper cover is covered in the upper layer box body by folding.The utility model, only need to be folded to form integrated double-layer packaging box body by a die blank, to improve the convenience of manufacture, transportation and use.

Description

Technical Field

[0001] This utility model relates to the field of packaging box technology, and in particular to a double-layer packaging box. Background Technology

[0002] With the development of the fast food industry, more and more Western fast food restaurants have entered our lives. For example, fast food such as French fries, chicken nuggets, fried chicken, and hamburgers are usually packaged in paper boxes when taken out. When we order, the restaurant will pack the different snacks separately. This not only wastes packaging boxes, but also takes up too much space with too many boxes, making it inconvenient to pick up food. Furthermore, it generates a lot of cardboard waste, which is not environmentally friendly.

[0003] Therefore, double-layer packaging boxes have emerged to simultaneously accommodate at least two different sets of snacks. However, existing double-layer packaging boxes typically employ a split structure, where two packaging components are assembled into a complete double-layer box using a pull-out mechanism or similar method. This split structure presents numerous inconveniences in manufacturing, transportation, and use, such as complex manufacturing processes, large space requirements during transportation, and low assembly efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a convenient one-piece double-layer packaging box.

[0005] To achieve the above objectives, this utility model provides a double-layer packaging box, which includes, from top to bottom: an upper cover, an upper box body, and a lower box body. All surfaces of the upper cover, the upper box body, and the lower box body are located on the same die-cut blank and are separated by fold lines.

[0006] The lower box has a lower bottom surface, and the left and right sides of the lower bottom surface are connected to the lower side surfaces. The front and rear sides of the lower bottom surface are connected to the lower front side surface and the upper cover connecting surface. The lower half of the upper cover connecting surface serves as the rear side surface of the lower box. The two lower side surfaces are respectively provided with lower corner connecting structures between the lower front side surface and the upper cover connecting surface, so that the lower box can be folded to form a box structure.

[0007] The upper box has an upper bottom surface. The front edge of the upper bottom surface is connected to the upper edge of the front side of the lower box by a fold line. The upper bottom surface is folded over the lower box. The left and right sides of the upper bottom surface are connected to the upper side surfaces. The rear side of the upper bottom surface is connected to the upper rear side surface by a fold line. The upper half of the top cover connecting surface is located outside the upper rear side surface. The two upper side surfaces and the upper rear side surface are respectively provided with upper corner connecting structures, so that the upper box can be folded to form a box structure.

[0008] The upper cover includes an upper cover plane and an upper cover connecting surface; the upper edge of the upper cover connecting surface is connected to the rear edge of the upper cover plane by a fold line, and the lower edge of the upper cover connecting surface is connected to the rear edge of the lower bottom surface by a fold line; a downwardly sloping upper cover slope is formed on the front side of the upper cover plane, an upper cover insert is provided on the front side of the upper cover slope, an upper cover buckle hole is provided on the front edge of the upper box, the upper cover insert is inserted into the upper cover buckle hole, and the upper cover is folded and closed on the upper box.

[0009] Furthermore, the lower box has a lower top piece at the top, which is connected to the upper edge of the lower side by a fold line and is fixedly supported below the bottom surface of the upper layer.

[0010] Furthermore, insertion interfaces are formed by cutting along the fold lines between each lower top plate and its connected lower side surface, and insertion pieces protruding towards the lower box body are formed by cutting along the fold lines between the upper bottom surface and each upper side surface; when the upper box body and the lower box body are combined, the insertion pieces are inserted into the insertion interfaces of the lower top plates one by one.

[0011] Furthermore, the top cover also has side panels on both sides of the top cover plane. When the top cover is closed on the upper box, the two side panels are inserted into the inner sides of the two upper side panels of the upper box.

[0012] Furthermore, the front sides of the two upper layers are folded inward to form a cover support piece. When the cover is closed on the upper box, the cover support piece fits and supports the lower part of the cover slope.

[0013] Furthermore, each lower corner connection structure includes a lower adhesive piece and a lower folding piece. Both the lower adhesive piece and the lower folding piece are triangular and share one side. The other side of the lower folding piece is connected to the lower side, and the other side of the lower adhesive piece is connected to the lower front side or the upper cover connection surface. Each lower adhesive piece is glued to the inner side of the lower front side or the upper cover connection surface. The lower folding piece is folded along the side shared with the lower adhesive piece and overlaps with the lower adhesive piece.

[0014] Furthermore, each upper corner connection structure includes an upper adhesive piece and an upper folding piece. Both the upper adhesive piece and the upper folding piece are triangular and share one side. The other side of the upper folding piece is connected to the upper side, and the other side of the upper adhesive piece is connected to the upper front side. Each upper adhesive piece is glued to the inner side of the upper front side. The upper folding piece is folded along the side shared with the upper adhesive piece and overlaps with the upper adhesive piece.

[0015] Furthermore, the sides of the double-layered packaging box are shaped like right-angled trapezoids, with the bottom surfaces of the upper and lower layers being the same size.

[0016] Furthermore, the upper cover slope, upper cover plane, upper cover connecting surface, lower bottom surface, lower front side, upper bottom surface, and upper rear side are sequentially separated by fold lines and arranged sequentially on the same die-cut blank. The lower side is located on both sides of the lower bottom surface, and the upper side is located on the left and right sides of the upper bottom surface.

[0017] Furthermore, the upper box folds backward from the front of the lower box to above it, and the top cover folds forward from the back of the lower box to cover the upper box.

[0018] With the above solution, the upper cover, upper box body and lower box body of this utility model are first folded to form the box shape, and then stacked together to form a double-layer covered structure. Only one die-cut blank is needed to fold into an integrated double-layer packaging box, thereby improving the convenience of manufacturing, transportation and use. Attached Figure Description

[0019] Figure 1 This is a planar schematic diagram of the unfolded die-cut blank of this utility model.

[0020] Figure 2 This is a schematic diagram of the molding process of this utility model (I).

[0021] Figure 3 This is a schematic diagram (II) of the molding process of this utility model.

[0022] Figure 4 This is a schematic diagram illustrating the use of this utility model.

[0023] Explanation of icon numbers:

[0024] 1. Top cover; 12. Top cover flat surface; 12. Top cover inclined surface; 12.1 Top cover insert; 13. Top cover side surface; 14. Top cover connecting surface;

[0025] 2. Lower box body; 21. Lower bottom surface; 22. Lower side surface; 221. Insertion interface; 23. Lower top piece; 24. Lower front side surface; 25. Lower corner connection structure; 251. Lower folding piece; 252. Lower adhesive piece;

[0026] 3 Upper box body; 31 Upper bottom surface; 32 Upper side surface; 321 Insertion piece; 33 Upper rear side surface; 34 Top cover buckle hole; 35 Upper corner connection structure; 351 Upper folding piece; 352 Upper adhesive piece; 36 Top cover support piece;

[0027] 4. Adhesive. Detailed Implementation

[0028] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0029] This utility model discloses an integrated double-layer packaging box, which can be formed by folding a piece of cardboard in one piece. (See reference...) Figure 1 This is an embodiment of the present invention, which is a flat view of a die-cut blank that can be folded into a double-layer box structure. The middle part of the die-cut blank is a rectangular part, which is divided into an upper cover inclined surface 12, an upper cover flat surface 12, an upper cover connecting surface 14, a lower bottom surface 21, a lower front side surface 24, an upper bottom surface 31, and an upper rear side surface 33 by fold lines from front to back. An upper cover buckle hole 34 is cut in the center of the fold line between the lower front side surface 24 and the upper bottom surface 31.

[0030] The rectangular portion of the die-cut blank also has several facets on its periphery, and these facets are separated from the rectangular portion by broken lines, wherein:

[0031] The upper cover inclined surface 12 has a front edge protruding a middle upper cover insert 121, and the upper cover plane 12 has protruding upper cover side surfaces 13 on the left and right sides.

[0032] The lower bottom surface 21 has protruding lower side surfaces 22 on both sides. The lower side surfaces 22 further extend outward in the opposite direction to the lower bottom surface 21 to form a lower top plate 23. The center of the fold line between the lower side surfaces 22 and the lower top plate 23 is cut to form an insertion interface 221. The front end of each lower side surface 22 is provided with a lower corner connection structure 25 between it and the upper cover connection surface 14. The rear end of each lower side surface 22 is provided with a lower corner connection structure 25 between it and the lower front side surface 24.

[0033] Upper side surfaces 32 protrude from the left and right sides of the upper bottom surface 31. A connecting piece 321 is formed by cutting along the center of the fold line between each upper side surface 32 and the upper bottom surface 31. The two ends of the connecting piece 321 are located on the fold line, and the fold line protrudes from the upper bottom surface 31. Therefore, when the upper side surface 32 is folded along the fold line to be perpendicular to both sides of the upper bottom surface 31, the connecting piece 321 will protrude vertically downward relative to the upper bottom surface 31 and can be inserted into the insertion interface 221. Furthermore, an upper corner connection structure 35 is provided between the front end of each upper side surface 32 and the upper rear side surface 33.

[0034] Based on the above-described die-cut blank structure, in this embodiment, the upper box 3 is folded from the front side of the lower box 2 to the back, and the upper cover 1 is folded from the back side of the lower box 2 to the front, covering the upper box 3. Therefore, the front and back sides of the die-cut blank correspond to the inner sides of the lower box 2 and the upper box 3, respectively. In addition, in this embodiment, the areas of the upper bottom surface 31 and the lower bottom surface 21 are the same, and the width of the upper cover connecting surface 14 is approximately equal to the sum of the widths of the lower front side surface 24 and the upper rear side surface 33 (in this embodiment, the widths of the lower front side surface 24 and the upper rear side surface 33 are equal). Therefore, after folding, the side shape of the double-layer packaging box is a right-angled trapezoid (see...). Figure 4The top bottom surface 31 and the bottom bottom surface 21 are the same size, and the height of the top box 3 and the bottom box 2 are the same.

[0035] The functions of the aforementioned upper corner connection structure 35 and lower corner connection structure 25 only need to satisfy the requirement that the upper box 3 and lower box 2 can be folded to form a stable box structure, and that the sides of the box can be fixed to each other. Therefore, the upper corner connection structure 35 and lower corner connection structure 25 can adopt various different structures. The structure used in this embodiment is as follows:

[0036] Each lower corner connection structure 25 includes a lower adhesive piece 252 and a lower folding piece 251. Both the lower adhesive piece 252 and the lower folding piece 251 are triangular and share one side. The other side of the lower folding piece 251 is connected to the lower side 22, and the other side of the lower adhesive piece 252 is connected to the lower front side 24 or the upper cover connection surface 14.

[0037] After the die-cut blank is formed, adhesive 4 and other adhesives are applied to the four lower adhesive pieces 252 (on the front side of the die-cut blank). The lower side 22 and other surfaces located on both sides of the lower bottom surface 21 (lower corner connection structure 25, lower top piece 23) are folded along the fold line toward the lower bottom surface 21, so that the adhesive 4 on each lower adhesive piece 252 is respectively adhered to the lower front side 24 or the inner side of the upper cover connection surface 14 (on the front side of the die-cut blank). Then, the lower folding piece 251 is folded along the side shared with the lower adhesive piece 252 and overlapped with the lower adhesive piece 252. The lower box body 2 can then initially form a box structure.

[0038] Similarly, each upper corner connection structure 35 includes an upper adhesive piece 352 and an upper folding piece 351. The upper adhesive piece 352 and the upper folding piece 351 are both triangular and share one side. The other side of the upper folding piece 351 is connected to the upper side 32, and the other side of the upper adhesive piece 352 is connected to the upper front side.

[0039] After the die-cut blank is formed, adhesive 4 and other adhesives are applied to the two upper adhesive sheets 352 (set on the back of the die-cut blank). The upper side 32 is folded along the fold line towards the upper bottom surface 31, so that the adhesive 4 on each upper adhesive sheet 352 is respectively adhered to the inner side of the upper front side (the back of the die-cut blank). Then, the upper folded sheet 351 is folded along the side shared with the upper adhesive sheet 352 and overlapped with the upper adhesive sheet 352. The upper box body 3 can then initially form the box structure.

[0040] See Figure 2This represents the initial forming state of the double-layer packaging box in this embodiment. At this stage, the upper cover 1, the upper box body 3, and the lower box body 2 are all initially formed. All surfaces of the upper cover 1, the upper box body 3, and the lower box body 2 are located on the same die-cut blank and separated by fold lines. The structure of each box layer is as follows:

[0041] 1. Lower box 2: It has a lower bottom surface 21, and lower side surfaces 22 are connected to the left and right sides of the lower bottom surface 21. The lower front side surface 24 and the upper cover connecting surface 14 are connected to the front and rear sides of the lower bottom surface 21. The lower half of the upper cover connecting surface 14 serves as the rear side surface of the lower box 2. Lower corner connecting structures 25 are respectively provided between the two lower side surfaces 22 and the lower front side surface 24 and the upper cover connecting surface 14, so that the lower box 2 can be folded to form a box structure.

[0042] The lower box 2 has a lower top piece 23 on its top. The lower top piece 23 is connected to the upper edge of the lower side 22 by a fold line. The lower top piece 23 is fixedly supported below the upper bottom surface 31.

[0043] 2. Upper box 3: It has an upper bottom surface 31. The front edge of the upper bottom surface 31 is connected to the upper edge of the lower front side surface 24 by a fold line. The upper bottom surface 31 is folded over the lower box 2. The left and right sides of the upper bottom surface 31 are connected to the upper side surface 32. The rear side of the upper bottom surface 31 is connected to the upper rear side surface 33 by a fold line. The upper half of the top cover connecting surface 14 is located outside the upper rear side surface 33. The two upper side surfaces 32 and the upper rear side surface 33 are respectively provided with upper corner connecting structures 35, so that the upper box 3 can be folded to form a box structure.

[0044] The upper box 3 is folded from the front side of the lower box 2 to the back and fixed to the lower box 2. Specifically, the fixing method is as follows: each lower top piece 23 and its connected lower side 22 are cut with an insertion interface 221, and the upper bottom surface 31 and each upper side 32 are cut with an insertion piece 321 protruding towards the lower box 2. When the upper box 3 and the lower box 2 are combined, the insertion pieces 321 are inserted into the insertion interfaces 221 of the lower top piece 23 one by one.

[0045] 3. Top cover 1: includes top cover plane 12 and top cover connecting surface 14; the upper edge of the top cover connecting surface 14 is connected to the rear edge of the top cover plane 12 by a fold line, and the lower edge of the top cover connecting surface 14 is connected to the rear edge of the lower bottom surface 21 by a fold line; a downwardly inclined top cover slope 12 is formed on the front side of the top cover plane 12, and a top cover insert 121 is provided on the front side of the top cover slope 12. A top cover buckle hole 34 is provided on the front edge of the upper box body 3, and the top cover insert 121 is inserted into the top cover buckle hole 34. The top cover 1 is folded and closed on the upper box body 3.

[0046] See Figure 3The upper cover plane 12 is also provided with upper cover side panels 13 on both sides. When the upper cover 1 is closed on the upper box 3, the two upper cover side panels 13 are respectively inserted into the inner side of the two upper side panels 32 of the upper box 3. The front side of the two upper side panels 32 is folded inward to form an upper cover support piece 36. When the upper cover 1 is closed on the upper box 3, the upper cover support piece 36 is attached and supported below the upper cover inclined surface 12.

[0047] With the above structure, the double-layer packaging box of this utility model is an integrated structure, which can be formed by folding a single die-cut blank. It is easy to manufacture and has a low cost. Furthermore, adhesive 4 can be pre-applied to the lower corner connecting structure 25 and the upper corner connecting structure 35 at the factory, so that each layer of the box is initially formed before being transported to the user for use. The user only needs to fold and fix the lower box 2 on top of the upper box 3 and close the top cover 1. There is no need to assemble multiple components, making the operation convenient.

[0048] The above is merely one embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-layer packaging box, characterized in that, From top to bottom, it includes: top cover, upper box body, and lower box body. All surfaces in the top cover, upper box body, and lower box body are located on the same die-cut blank and are separated by fold lines. The lower box has a lower bottom surface, and the left and right sides of the lower bottom surface are connected to the lower side surfaces. The front and rear sides of the lower bottom surface are connected to the lower front side surface and the upper cover connecting surface. The lower half of the upper cover connecting surface serves as the rear side surface of the lower box. The two lower side surfaces are respectively provided with lower corner connecting structures between the lower front side surface and the upper cover connecting surface, so that the lower box can be folded to form a box structure. The upper box has an upper bottom surface. The front edge of the upper bottom surface is connected to the upper edge of the front side of the lower box by a fold line. The upper bottom surface is folded over the lower box. The left and right sides of the upper bottom surface are connected to the upper side surfaces. The rear side of the upper bottom surface is connected to the upper rear side surface by a fold line. The upper half of the top cover connecting surface is located outside the upper rear side surface. The two upper side surfaces and the upper rear side surface are respectively provided with upper corner connecting structures, so that the upper box can be folded to form a box structure. The upper cover includes an upper cover plane and an upper cover connecting surface; the upper edge of the upper cover connecting surface is connected to the rear edge of the upper cover plane by a fold line, and the lower edge of the upper cover connecting surface is connected to the rear edge of the lower bottom surface by a fold line; a downwardly sloping upper cover slope is formed on the front side of the upper cover plane, an upper cover insert is provided on the front side of the upper cover slope, an upper cover buckle hole is provided on the front edge of the upper box, the upper cover insert is inserted into the upper cover buckle hole, and the upper cover is folded and closed on the upper box.

2. A double-layer packaging box according to claim 1, characterized in that, The lower box has a lower top piece at the top, which is connected to the upper edge of the lower side by a fold line and is fixedly supported below the bottom surface of the upper box.

3. A double-layer packaging box according to claim 2, characterized in that, Each lower top panel has an insertion interface cut along the fold line between it and the lower side panel. The upper bottom panel has an insertion piece cut along the fold line between it and the upper side panel, protruding towards the lower box. When the upper box and the lower box are combined, the insertion pieces are inserted into the insertion interfaces of the lower top panels one by one.

4. A double-layer packaging box according to claim 1, characterized in that, The top cover also has side panels on both sides of the top cover plane. When the top cover is closed on the upper box, the two side panels of the top cover are inserted into the inner sides of the two upper side panels of the upper box.

5. A double-layer packaging box according to claim 1, characterized in that, The front sides of the two upper layers are folded inward to form a cover support piece. When the cover is closed on the upper box, the cover support piece fits and supports the lower part of the cover slope.

6. A double-layer packaging box according to claim 1, characterized in that, Each lower-layer corner connection structure includes a lower-layer adhesive piece and a lower-layer folding piece. Both the lower-layer adhesive piece and the lower-layer folding piece are triangular and share one side. The other side of the lower-layer folding piece is connected to the lower-layer side, and the other side of the lower-layer adhesive piece is connected to the lower-layer front side or the upper cover connecting surface. Each lower-layer adhesive piece is glued to the inner side of the lower-layer front side or the upper cover connecting surface. The lower-layer folding piece is folded along the side shared with the lower-layer adhesive piece and overlaps with the lower-layer adhesive piece.

7. A double-layer packaging box according to claim 1, characterized in that, Each upper corner connection structure includes an upper adhesive piece and an upper folding piece. Both the upper adhesive piece and the upper folding piece are triangular and share one side. The other side of the upper folding piece is connected to the upper side, and the other side of the upper adhesive piece is connected to the upper front side. Each upper adhesive piece is glued to the inner side of the upper front side. The upper folding piece is folded along the side shared with the upper adhesive piece and overlaps with the upper adhesive piece.

8. A double-layer packaging box according to any one of claims 1 to 7, characterized in that, The double-layered packaging box has a right-angled trapezoidal shape on the side, with the bottom surfaces of the upper and lower layers being the same size.

9. A double-layer packaging box according to any one of claims 1 to 7, characterized in that, The upper cover slope, upper cover plane, upper cover connecting surface, lower bottom surface, lower front side, upper bottom surface, and upper rear side are sequentially separated by fold lines and arranged on the same die-cut blank. The lower side is located on both sides of the lower bottom surface, and the upper side is located on the left and right sides of the upper bottom surface.

10. A double-layer packaging box according to claim 9, characterized in that, The upper box folds backward from the front of the lower box to the top of the lower box, and the top cover folds forward from the back of the lower box to cover the upper box.

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