A folding preservation box

Abstract

This application relates to the technical field of food storage boxes, and discloses a folding food storage box, which includes a folding panel and two side panels. The folding panel includes a first cover plate, a first box panel, a bottom plate, a second box panel, and a second cover plate connected in sequence. Connecting grooves are formed between the first cover plate, the first box panel, the bottom plate, the second box panel, and the second cover plate. Fixing grooves are formed on both sides of the top surface of the first cover plate, the first box panel, the bottom plate, the second box panel, and the second cover plate, forming several bosses and side edges. The two side panels are respectively inserted into the fixing grooves, and the side panels are interference-fitted with the fixing grooves. When the thickness of the side panel is not greater than 18mm, the ratio between the thickness of the side panel and the width of the side edge is 1:0.72-0.88. When the thickness of the bottom plate is not greater than 18mm, the ratio between the thickness of the bottom plate and the depth of the fixing groove is 1:0.43-0.53. An adhesive layer is provided on the side wall where the side panel connects to the first box panel, the second box panel, the first cover plate, and the second cover plate, and the width of the adhesive layer is less than the thickness of the side panel.

Description

Technical Field

[0001] This application relates to the field of food storage boxes, and more specifically to a foldable food storage box. Background Technology

[0002] As people's living standards continue to improve, their demands for the quality of fresh and frozen foods are also increasing. Therefore, food preservation during transportation and short-term storage is becoming increasingly important. Currently, the main method for food preservation during transportation is through one-piece molded insulated boxes, which are bulky and occupy a significant amount of transportation space, resulting in high transportation costs and inconvenience.

[0003] Currently, the inventor has filed prior Chinese utility model patents with publication numbers CN216140515U and CN212829740U, which disclose a sturdy, reusable, foldable food storage box and a reusable foldable food storage box, solving the problems of high transportation costs and difficulty in transportation of ordinary food storage boxes.

[0004] Regarding the aforementioned technologies, the inventors believe that when thinner side panels and folding panels are used in the food storage box, the depth of the grooves on the folding panels is limited, making it difficult to ensure the connection strength between the side panels and the folding panels, thus affecting the overall impact resistance of the food storage box. In addition, the groove positions of the side panels and the box body or top panel are not easy to correspond perfectly. During the actual insertion and assembly process, the edge of the side panel and the groove of the folding panel are prone to breakage or damage, resulting in gaps between the assembled panels and causing poor airtightness of the food storage box. Utility Model Content

[0005] To alleviate the shortcomings of food storage boxes with small wall thickness and poor overall impact resistance and airtightness, this application provides a foldable food storage box.

[0006] This application provides a foldable food storage box, which adopts the following technical solution:

[0007] A folding food storage box includes a folding panel and two side panels; the folding panel includes a first cover plate, a first box panel, a bottom plate, a second box panel, and a second cover plate connected in sequence.

[0008] A connecting groove is provided between the first cover plate, the first housing plate, the bottom plate, the second housing plate, and the second cover plate; a fixing groove is provided on both sides of the top surface of the first cover plate, the first housing plate, the bottom plate, the second housing plate, and the second cover plate, forming a plurality of bosses and side edges, and the two side plates are respectively inserted into the fixing grooves, and the side plates are interference fit with the fixing grooves;

[0009] When the thickness of the side plate is not greater than 18mm, the ratio between the thickness of the side plate and the width of the side edge is 1:0.72-0.88; when the thickness of the bottom plate is not greater than 18mm, the ratio between the thickness of the bottom plate and the depth of the fixing groove is 1:0.43-0.53.

[0010] An adhesive layer is provided on the side wall where the side panel connects to the first box panel, the second box panel, the first cover plate, and the second cover plate. The width of the adhesive layer is less than the thickness of the side panel.

[0011] By adopting the above technical solution, the side panel and the fixing groove are interference-fitted. The side panel is slightly larger than the fixing groove, requiring a certain force during insertion to generate continuous friction. This friction keeps the side panel tightly connected to the rest of the box, preventing accidental loosening and providing immediate structural rigidity. This alleviates the problem of easy breakage or damage to the groove between the side panel edge and the folding main body panel, improving the overall impact resistance of the food storage box. When the side panel width is ≤18mm, the side panel's bending stiffness is relatively weak. The side edge width increases proportionally with the side panel width. Increasing the side edge width can significantly improve the local strength of the slot area, preventing deformation or breakage at the insertion point when the side panel is under pressure. Simultaneously, when the bottom plate thickness is ≤18mm, the ratio between the bottom plate thickness and the fixing groove depth is 1:0.43-0.53. Due to the relatively thin bottom plate, to reduce the impact of the fixing groove on the structural stability of the bottom plate, the fixing groove should not be too deep. By setting an adhesive layer on the side wall of the side panel, it adheres to the inner wall of the adjacent panel after the side panel is inserted. The adhesive layer provides strong tensile and shear strength, making the connection between the side panels and the bottom panel more secure and significantly improving the overall structural stability, especially resisting lateral forces or pressure from items inside the box. The adhesive layer fills the tiny gaps between the side panels and adjacent panels, forming a continuous sealing strip that effectively prevents cold air leakage from inside the box or the intrusion of external heat / moisture, greatly improving the preservation effect. In addition, the width of the adhesive layer is less than the thickness of the side panel, so that the adhesive layer does not extend to the edge of the side panel. This ensures that when inserting the side panel, the adhesive strip will not scratch or accidentally stick to the entrance edge of the fixing groove or the boss / side edge, making the insertion process smoother, less resistant, and protecting the integrity of the adhesive layer. The adhesive layer is designed in the center area of ​​the contact surface of the panels to be connected, making it easier to accurately align and adhere to the inner wall of the target panel after insertion. The operator does not need to worry about the adhesive layer extending beyond the contact surface and sticking to places that should not be stuck. Without sacrificing or even enhancing the sealing and structural strength, it significantly improves the convenience, reliability, and efficiency of assembly.

[0012] Optionally, the adhesive layer includes a first adhesive layer disposed on both side walls along the length of the side panel and a second adhesive layer disposed at one end along the height of the side panel. The first adhesive layer is used to connect with the first housing panel and the second housing panel, and the second adhesive layer is used to connect with the first cover plate and the second cover plate. One end of the first adhesive layer is flush with the end of the side panel away from the bottom plate, and the length of the first adhesive layer is less than the height of the side panel.

[0013] By adopting the above technical solution, one end of the first adhesive layer is flush with the end of the side panel away from the bottom plate, and its length is less than the height of the side panel. The first adhesive layer does not extend all the way to the bottom edge of the side panel, but terminates prematurely near the bottom. During the assembly of the food storage box, it is difficult to accurately insert the side panel into the middle position of the first box panel and the second box panel. It is necessary to correct it by squeezing the first box panel and the second box panel. When connecting the first box panel and the second box panel to the side panel, the side panel near the bottom plate contacts the first box panel and the second box panel first. No adhesive layer is set at this position, making the position adjustment of the side panel more convenient and avoiding the difficulty of correction due to the side panel being glued to the first box panel and the second box panel too early, thus improving the convenience of assembling the food storage box.

[0014] Optionally, the width of the fixing groove (mm) is equal to the thickness of the side plate minus 1mm.

[0015] Optionally, the two ends of the second adhesive layer are flush with the two ends of the side plate along its length.

[0016] Optionally, the outer side wall and top surface of the side ridge and the bottom surface of the folded plate are all provided with a covering layer.

[0017] By adopting the above technical solution, a covering layer is set on the outer wall and top surface of the side edge and the bottom surface of the folded panel, which reduces the possibility of edge breakage of the side edge, improves the overall structural strength of the food storage box, gives each panel better impact resistance and load-bearing capacity, improves the heat insulation and sealing performance of the food storage box, improves the preservation effect, makes the food storage box more beautiful, and has a certain scratch and stain resistance.

[0018] Optionally, the thickness of the folding plate is 9-36mm, the height of the side edge is 9-36mm, the height of the side edge is the same as the thickness of the folding plate, and the thickness of the side plate is 9-36mm.

[0019] Optionally, when the thickness of the side plate is greater than 18mm, the width of the side edge is 15mm.

[0020] By adopting the above technical solution, when the side panel width is >18mm, the side panel already has sufficient bending stiffness, and fixing the side edge width can avoid material waste and control the box size.

[0021] Optionally, the material of the covering layer is any one of white cardboard, kraft paper, gray-backed white paper, specialty paper, non-woven fabric and PU leather, and the thickness of the covering layer is 0.4-0.2mm.

[0022] Optionally, the covering layer also covers the inner sidewall of the side edge.

[0023] By adopting the above technical solution, the covering layer also covers the inner sidewall of the side edge, further improving the integrity of the folded plate.

[0024] Optionally, both the first adhesive layer and the second adhesive layer are double-sided tape.

[0025] By adopting the above technical solution, both the first adhesive layer and the second adhesive layer are double-sided tape. One side of the double-sided tape is adhered to the side panel, and the film on the other side is removed during assembly to ensure the bonding effect of the adhesive layer.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By interfering with the fixing groove, the side panel is slightly larger than the fixing groove. A certain force is required when inserting it, generating continuous friction. This friction keeps the side panel tightly connected to the rest of the box, preventing accidental loosening and providing immediate structural rigidity. This alleviates the problem of easy breakage or damage to the grooves between the side panel edges and the folding main body panel, improving the overall impact resistance of the food storage box. By setting an adhesive layer on the side wall of the side panel, it adheres to the inner wall of the adjacent panel after the side panel is inserted, providing strong tensile and shear resistance. This significantly improves the stability of the overall structure, especially resisting lateral forces or pressure from the items inside the box. In addition, the adhesive layer fills the tiny gaps between the side panel and the adjacent panel, forming a continuous sealing strip that effectively prevents cold air leakage or external hot / moisture intrusion, greatly improving the preservation effect.

[0028] 2. By setting the width of the first adhesive layer and the width of the second adhesive layer to be less than the thickness of the side plate, the adhesive layer will not extend to the edge of the side plate. This ensures that when the side plate is inserted, the adhesive tape will not scratch or accidentally stick to the entrance edge of the fixing groove or the boss / side edge, making the insertion process smoother and less resistant. It also protects the integrity of the adhesive layer. The adhesive layer is designed in the center area of ​​the contact surface of the plates to be connected, making it easier to accurately align and adhere to the inner wall of the target plate after insertion. The operator does not need to worry about the adhesive layer going beyond the contact surface and sticking to places that should not be stuck. Without sacrificing or even enhancing the sealing and structural strength, it significantly improves the convenience, reliability and efficiency of assembly.

[0029] 3. By setting a covering layer on the outer side wall, top surface, and bottom surface of the folded panel, the possibility of edge breakage of the side edge is reduced, the overall structural strength of the food storage box is improved, the impact resistance and load-bearing capacity of each panel are improved, the heat insulation and sealing performance of the food storage box are improved, the preservation effect is improved, the appearance of the food storage box is more beautiful, and it also has a certain degree of scratch and stain resistance. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of the first adhesive tape in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the second adhesive tape in the embodiments of this application.

[0034] Reference numerals in the attached drawings: 1. First cover plate; 2. First housing plate; 3. Bottom plate; 4. Second housing plate; 5. Second cover plate; 6. Side plate; 7. First adhesive layer; 8. Connecting groove; 9. Fixing groove; 10. Boss; 11. Side edge; 12. Second adhesive layer; 13. Covering layer. Detailed Implementation

[0035] To more clearly illustrate the overall concept of this application, the following is in conjunction with the appendix. Figure 1-3 This application will be described in further detail.

[0036] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0037] The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below with specific embodiments. It should be noted that, unless otherwise specified, the following embodiments can be referenced, learned from, or combined with each other. The same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0038] This application discloses a foldable food storage box, specifically involving three sizes of foldable insulated boxes. The thickness of the folding panel, the height of the side edge 11, and the thickness of the side panel 6 are equal in all three sizes. The first product is a 9mm type, the second product is a 24mm type, and the third product is a 36mm type. The 24mm type product will be used as an example for detailed explanation below.

[0039] Reference Figure 1 A folding food storage box includes a folding panel and two side panels 6. The folding panel includes a first cover plate 1, a first box panel 2, a bottom plate 3, a second box panel 4, and a second cover plate 5 connected in sequence. Connecting grooves 8 are formed between the first cover plate 1, the first box panel 2, the bottom plate 3, the second box panel 4, and the second cover plate 5. Fixing grooves 9 are formed on both sides of the top surface of the first cover plate 1, the first box panel 2, the bottom plate 3, the second box panel 4, and the second cover plate 5, creating several bosses 10 and side edges 11. The two side panels 6 are respectively inserted into the fixing grooves 9, with an interference fit between the side panels 6 and the fixing grooves 9. An adhesive layer is provided on the side wall where the side panels 6 connect to the first box panel 2, the second box panel 4, the first cover plate 1, and the second cover plate 5.

[0040] When the thickness of the side plate 6 is not greater than 18mm, the width of the side edge 11 increases with the increase of the thickness of the side plate 6, and the ratio between the thickness of the side plate 6 and the width of the side edge 11 is (1:0.72-0.88); when the thickness of the side plate 6 is greater than 18mm, the width of the side edge 11 remains unchanged.

[0041] When the width of side panel 6 is ≤18mm, the bending stiffness of side panel 6 itself is relatively weak. The width of side rib 11 increases proportionally with the width of side panel 6. Increasing the width of side rib 11 can significantly improve the local strength of the slot area and prevent deformation or breakage of the insertion joint when side panel 6 is under pressure. When the width of side panel 6 is >18mm, side panel 6 already has sufficient bending stiffness. Fixing the width of side rib 11 can avoid material waste and control the size of the box.

[0042] In this embodiment, the side plate 6 has a thickness of 24mm, the fixing groove 9 has a depth of 12mm, and the side edge 11 has a width of 15mm.

[0043] In another preferred embodiment, when the thickness of the side panel 6 is greater than 18 mm, the ratio between the thickness of the side panel 6 and the width of the side rib 11 is (1:0.88-1.12). When the density of the objects placed inside the box is high, the width of the side rib 11 can also be increased to further improve the structural strength of the food storage box.

[0044] The side panel 6 and the fixing groove 9 are interference-fitted. The width (mm) of the fixing groove 9 is equal to the thickness (mm) of the side panel 6 - 1. In this embodiment, the width of the fixing groove 9 is 23mm. During the insertion of the side panel 6 into the fixing groove, a certain force is required, generating continuous friction. This friction helps maintain a tight connection between the side panel 6 and other parts of the box, preventing accidental loosening and providing immediate structural rigidity. This alleviates the problem of easy breakage or damage to the edge of the side panel 6 and the groove of the folding main body panel, improving the overall impact resistance of the food storage box. By providing an adhesive layer on the side wall of the side panel 6, it adheres to the inner wall of the adjacent panel after insertion, providing strong tensile and shear strength, significantly improving the overall structural stability, especially resisting lateral forces or pressure from items inside the box. Furthermore, the adhesive layer fills the tiny gaps between the side panel 6 and the adjacent panel, forming a continuous sealing strip that effectively prevents cold air leakage or external hot / humid air intrusion, greatly improving the preservation effect.

[0045] In this embodiment, the folding plate and the side plate 6 are both made of extruded polystyrene board (XPS board) with a compressive strength of 355kPa.

[0046] In some preferred embodiments, when the thickness of the base plate 3 is no more than 18 mm, the ratio between the thickness of the base plate 3 and the depth of the fixing groove 9 is (1:0.43-0.53). Since the base plate 3 is relatively thin, in order to reduce the impact of the fixing groove 9 on the structural stability of the base plate 3, the fixing groove 9 should not be made too deep, and the bonding layer is used to compensate for the connection strength between the side plate 6 and the base plate 3.

[0047] Reference Figure 1 The outer walls and top surface of the side ribs 11, as well as the bottom surface of the folded panels, are all provided with a covering layer 13. By providing the covering layer 13 on the outer walls and top surface of the side ribs 11, as well as the bottom surface of the folded panels, the possibility of edge breakage of the side ribs 11 is reduced, the overall structural strength of the food storage box is improved, and the panels have better impact resistance and load-bearing capacity. At the same time, it improves the heat insulation and sealing performance of the food storage box, enhances the preservation effect, makes the food storage box more aesthetically pleasing, and also provides a certain degree of scratch and stain resistance.

[0048] Reference Figure 1 The covering layer 13 also covers the inner sidewall of the side edge 11, further improving the overall integrity of the folded panel. The material of the covering layer 13 can be any one of white cardboard, kraft paper, grey-backed white paper, specialty paper, non-woven fabric, and PU leather. In this embodiment, the covering layer 13 is white cardboard. The thickness of the covering layer 13 is 0.4 mm.

[0049] In another preferred embodiment, a covering layer is provided on the outer wall of the side plate 6. The thickness of the covering layer 13 on the outside of the side plate 6 is 0.2mm, which makes it easier for the side plate 6 to be inserted into the fixing grooves 9 of each plate body. At the same time, it further protects the edge of the side edge 11, improves the fault tolerance rate of manual operation, ensures the yield rate of the final assembled product, and also improves the pressure resistance of the side edge 11.

[0050] In another preferred embodiment, the covering layer 13 on the outer wall of the side plate 6 is integrally formed with the covering layer 13 on the top of the side ridge 11. The covering layer 13 is bonded to the outer wall of the side ridge 11, and the covering layer 13 is bonded to the portion of the side plate 6 that is not inserted into the fixing groove 9.

[0051] By adopting the above technical solution, the covering layer 13 on the outer wall of the side panel 6 and the covering layer 13 on the top of the side edge 11 are integrally set. After the box is assembled, the joint between the side panel 6 and the folding panel, especially the side edge 11, is completely covered by a single continuous covering layer 13, sealing the area of ​​the box most prone to leakage and preventing liquid from seeping out from the bottom joint. The covering layer 13 is bonded to the outer wall of the side edge 11 and to the part of the side panel 6 that is not inserted into the fixing groove 9. This ensures that the covering layer 13 fits tightly, is not easy to shift or form gaps, and further enhances the sealing effect. The bonding also effectively suppresses the slight shaking or loosening that may occur in the side panel 6 during use, improving the reliability of use.

[0052] In addition, the covering layer on the bottom and sides of the box, especially when the material has a certain strength, can play a reinforcing role similar to "skin", making the entire box structure more stable, especially when bearing weight and stacking.

[0053] Reference Figure 1 , Figure 2 and Figure 3 The adhesive layer includes a first adhesive layer 7 disposed on both sides of the side panel 6 along its length and a second adhesive layer 12 disposed at one end of the side panel 6 along its height. The first adhesive layer 7 is used to connect with the first housing panel 2 and the second housing panel 4, and the second adhesive layer 12 is used to connect with the first cover plate 1 and the second cover plate 5. The width of the first adhesive layer 7 and the width of the second adhesive layer 12 are both less than the thickness of the side panel 6.

[0054] The width of the first adhesive layer 7 and the width of the second adhesive layer 12 are both less than the thickness of the side plate 6, so that the adhesive layer does not extend to the edge of the side plate 6. This ensures that when the side plate 6 is inserted, the adhesive tape will not scratch or accidentally stick to the entrance edge of the fixing groove 9 or the boss 10 / side edge 11, making the insertion process smoother, with less resistance, and protecting the integrity of the adhesive layer. The adhesive layer is designed in the center area of ​​the contact surface of the plates to be connected, making it easier to accurately align and adhere to the inner wall of the target plate after insertion. The operator does not need to worry about the adhesive layer going beyond the contact surface and sticking to places that should not be stuck. Without sacrificing or even enhancing the sealing and structural strength, the ease, reliability and efficiency of assembly are significantly improved.

[0055] Reference Figure 2 and Figure 3 One end of the first adhesive layer 7 is flush with the end of the side panel 6 away from the bottom plate 3, and the length of the first adhesive layer 7 is less than the height of the side panel 6. The first adhesive layer 7 does not extend all the way to the bottom edge of the side panel 6, but terminates prematurely near the bottom. During the assembly of the food storage box, it is difficult to accurately insert the side panel 6 into the middle position of the first box panel 2 and the second box panel 4. It is necessary to correct it by pressing the first box panel 2 and the second box panel 4. When connecting the first box panel 2 and the second box panel 4 to the side panel 6, the side panel 6 contacts the first box panel 2 and the second box panel 4 first at the position near the bottom plate 3. No adhesive layer is set at this position, making it easier to adjust the position of the side panel 6. This avoids the difficulty in correction due to the side panel 6 being glued to the first box panel 2 and the second box panel 4 too early, thus improving the ease of assembly of the food storage box.

[0056] The two ends of the second adhesive layer 12 are flush with the two ends of the side plate 6 along its length.

[0057] In this embodiment, both the first adhesive layer 7 and the second adhesive layer 12 are double-sided tape. One side of the double-sided tape is adhered to the side panel 6, and the film on the other side is removed during assembly to ensure the adhesion effect of the adhesive layers.

[0058] In this embodiment, the assembly steps of the food storage box are as follows: First, vertically insert the two side panels 6 into the fixing grooves 9 on both sides of the bottom plate 3. After insertion, the two side panels 6 are in a vertical state. Then, fold the first box panel 2 and the second box panel 4 upwards at the same time, so that the fixing grooves 9 of the first box panel 2 and the second box panel 4 initially contact the two sides of the two side panels 6. Use the compression of the first box panel 2 and the second box panel 4 to correct the side panels 6. After correction, insert the fixing grooves 9 of the two side panels into the middle. Finally, bring the first cover plate 1 and the second cover plate 5 close to the top of the two side panels 6 and then insert the fixing grooves 9 of the two cover plates into the top of the two side panels 6 to complete the assembly.

[0059] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A folding crisper characterized by: It includes a folding panel and two side panels; the folding panel includes a first cover plate, a first box plate, a bottom plate, a second box plate, and a second cover plate connected in sequence. A connecting groove is provided between the first cover plate, the first housing plate, the bottom plate, the second housing plate, and the second cover plate; a fixing groove is provided on both sides of the top surface of the first cover plate, the first housing plate, the bottom plate, the second housing plate, and the second cover plate, forming a plurality of bosses and side edges, and the two side plates are respectively inserted into the fixing grooves, and the side plates are interference fit with the fixing grooves; When the thickness of the side plate is not greater than 18mm, the ratio between the thickness of the side plate and the width of the side edge is 1:0.72-0.88; When the thickness of the base plate is no more than 18mm, the ratio between the thickness of the base plate and the depth of the fixing groove is 1:0.43-0.53; An adhesive layer is provided on the side wall where the side panel connects to the first box panel, the second box panel, the first cover plate, and the second cover plate. The width of the adhesive layer is less than the thickness of the side panel.

2. A folding crisper according to claim 1, wherein: The adhesive layer includes a first adhesive layer disposed on both sides of the side panel along its length and a second adhesive layer disposed at one end of the side panel along its height. The first adhesive layer is used to connect with the first box panel and the second box panel, and the second adhesive layer is used to connect with the first cover plate and the second cover plate. One end of the first adhesive layer is flush with the end of the side panel away from the bottom plate, and the length of the first adhesive layer is less than the height of the side panel.

3. A folding crisper according to claim 2, wherein: The width of the fixing groove is equal to the thickness of the side plate minus 1 mm.

4. The collapsible preservation case of claim 2, wherein: The two ends of the second adhesive layer are flush with the two ends of the side plate along its length.

5. The folding preservation case according to claim 1, wherein: The outer side wall and top surface of the side ridge and the bottom surface of the folded plate are all provided with a covering layer.

6. The collapsible preservation case of claim 1, wherein: The thickness of the folding plate is 9-36mm, the height of the side edge is 9-36mm, the height of the side edge is the same as the thickness of the folding plate, and the thickness of the side plate is 9-36mm.

7. The collapsible preservation case of claim 1, wherein: When the thickness of the side plate is greater than 18mm, the width of the side edge is 15mm.

8. The collapsible preservation case of claim 5, wherein: The thickness of the coating layer is 0.4-0.2 mm.

9. The collapsible preservation case of claim 5, wherein: The covering layer also covers the inner sidewall of the side edge.

10. The collapsible preservation case of claim 2, wherein: Both the first adhesive layer and the second adhesive layer are double-sided tape.

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