A paperboard structure and paper tray based on single-layer paperboard rapid folding forming

Abstract

This invention discloses a cardboard structure and paper tray based on rapid folding and forming of a single-layer cardboard. The cardboard is cut with a die and pre-set creases and slits, including a bottom plate, side plates, and an inward folding surface. An embedded adhesive ear serves as the first adhesive part. The structural feature lies in utilizing horizontal and vertical folding lines and L-shaped support strips. Through a clever crease design, it can be automatically formed by bidirectional opposing compression. The inward folding surface is folded along the pre-set creases and glued for later use, facilitating transportation and storage. During assembly, the bending and fixing of the L-shaped support strips form a stable strip-shaped upright edge and a hollow support frame. This design facilitates rapid assembly into end-protection buffer frames of the same size, suitable for supporting and protecting goods inside cartons. It offers advantages such as high production efficiency and convenient transportation, low paper consumption, low cost, high forming efficiency, and ease of operation, greatly improving the manual efficiency and output of paper tray forming.

Description

Technical Field

[0001] This invention relates to the field of paper tray lining technology for packaging boxes, specifically a cardboard structure and paper tray based on rapid folding of a single layer of cardboard. Background Technology

[0002] Cardboard box liners, especially paper trays, play an increasingly important role in modern packaging due to their environmental friendliness, recyclability, and excellent cushioning properties.

[0003] 1. Environmental Advantages: Paper trays are primarily made from paper pulp, making them a sustainable packaging solution that is fully recyclable and meets the growing global demand for environmental protection. Compared to traditional plastic foam materials, they have a smaller environmental impact during production and disposal.

[0004] 2. Wide range of applications: Suitable for various industries, including but not limited to electronic products, food (such as eggs and fruits), precision instruments, glass and ceramic products, handicrafts, etc. Especially suitable for protecting static-sensitive or fragile products.

[0005] 3. Cushioning performance: It has good cushioning and shock absorption performance, which can effectively protect the product from impact and vibration damage during transportation.

[0006] 4. Cost-effectiveness: With technological advancements, the production cost of paper trays is relatively low, the production cycle is short, and the raw material costs are also relatively economical.

[0007] 5. Customized Design: Custom designs can be made according to the shape and protection requirements of different products, including various structural elements such as wave, platform, and semi-circle, to achieve the best protection effect.

[0008] However, existing paper trays currently have the following shortcomings:

[0009] 1. Dependence on manual labor: Some paper tray products still require manual folding and shaping, especially in the production of highly customized and structurally complex paper trays (which require support and cushioning structures for the four side walls). The degree of automation is limited, which increases labor costs and production time.

[0010] 2. Structural complexity: For paper trays that require four-sided cushioning or special shapes, multiple sheets of cardboard may need to be glued and folded together. This not only increases material costs but also affects the time required for paper tray forming, resulting in low efficiency of manual packing and reduced production capacity.

[0011] 3. Poor applicability: For different product packaging needs, the size, shape, protection and cushioning level, strength and thickness requirements of the paper tray lining are different. To address these differences, it is usually necessary to redesign the paperboard forming shape, which leads to differences in the forming methods of paper trays of different specifications and models. This further increases the cumbersomeness of the manual processing and reduces production capacity.

[0012] In conclusion, although paper trays have significant advantages in terms of environmental protection and cost control, their production efficiency, physical properties, and applicability under specific conditions still have certain limitations, which are the directions for future technological improvement and innovation. Summary of the Invention

[0013] This invention addresses the shortcomings and defects of existing technologies. The inventors have designed a novel cardboard structure that enables rapid and convenient forming of the cardboard liner from a single, integrated cardboard sheet. This significantly improves the efficiency of paper tray forming and offers superior technical advantages such as stable support, low paper consumption, and low cost. Specifically, this invention is implemented as follows:

[0014] A cardboard structure based on rapid folding of a single layer of cardboard, comprising the following key structures:

[0015] 1. Cardboard Body: Made of single-layer cardboard, cut with pre-set creases and slits using a die-cutting machine, including the bottom panel, two side panels, and four inward-folding surfaces. The top of each inward-folding surface features an outward-extending first adhesive section (adhesive ear).

[0016] 2. Horizontal folding creases: Two symmetrical creases set along the horizontal center line of the cardboard to form the bottom panel and define the position of the side panels.

[0017] 3. Vertical fold cuts: Four vertical fold cuts extending along the inner edge of the inward fold ear to the middle of the cardboard are used to define the inward fold face and assist in folding the cardboard.

[0018] 4. Creases on the inward folded surface: On the inward folded surface, starting from the adhesive ear, there are first, second and third creases in sequence, and the second adhesive part is formed between adjacent third creases.

[0019] 5. L-shaped support strip: Located at the intersection of the transverse folding crease and the fold line, it has a tongue that can be bent into an L-shape, the width of which matches the inner folding surface, and includes a third adhesive part.

[0020] When needed, the cardboard structure deforms rapidly by squeezing the side panels inward. The inward-folding surfaces are guided upright by the second and third folds and the adhesive sections, forming a strip-shaped upright edge structure. L-shaped support strips are placed horizontally as the structure unfolds, providing additional support. The final structure is a buffer frame with equal thickness, height, and width, closed at both ends, suitable for placement inside a carton, providing stable support and protection for items, and exhibiting excellent cushioning performance.

[0021] The working principle of this invention: The cardboard structure of this invention is made from a single piece of cardboard, which is automatically cut, creasing, and shaped by a die-cutting machine. Its basic structure includes two side panels and a bottom panel divided by two transverse folding creases. On the long sides of the two cardboard panels, vertical folding creases and vertical folding cuts serve as fold lines, which can separate two inward folded surfaces. The upper and lower ends of the inward folded surfaces are provided with adhesive ears and a first fold, a second fold, and a third fold. With the adhesive of the first adhesive part and the adhesive ears, the inward folded surfaces are folded at the two long sides of the cardboard before folding. When the two side panels of the cardboard are pressed inward from both ends, they are folded inward and upright along the transverse folding creases. During this process, the inward folded surfaces are bent due to the fixation of the two adhesive parts and the action of the second and third folds, and stand up from the side of the cardboard, thus forming a strip-shaped upright edge structure. The L-shaped support strip is bent and stretched horizontally to form a hollow paper frame structure with a support strip. The inward folding surfaces at both ends are formed opposite each other and cooperate to form a protective buffer frame with equal thickness, height, and width at both ends. When this paper tray structure is placed in a carton, it can form a support structure at both ends, providing support, protection, and buffering functions. Preferably, a fifth, sixth, seventh, and eighth fold can be set on the long side to form a right-angle flange structure or a square tube structure that folds outward in the side direction. At the same time, a rectangular bottom wing surface can be reserved on the bottom plate through a right-angle cut. When the paper tray is placed in the carton, the right-angle flange structure or square tube structure, together with the bottom wing surface, can form a sandwich structure relative to the side plate of the carton. This sandwich structure can also provide buffering protection and support, so that the formed paper tray has a stable bracket function of protection, buffering, and support on all four sides.

[0022] Beneficial technical effects of the present invention:

[0023] 1. High efficiency of automated production: By using automated die-cutting equipment to complete modern and mature automated processing such as slit cutting, creasing, and cutting, the processing cost is low. When used in conjunction with automated adhesive folding and forming equipment, the production efficiency and consistency of finished products can be improved, and the manufacturing cost can be reduced.

[0024] 2. Integrated structural design: The entire paper tray structure is processed from a single piece of cardboard, which reduces assembly steps, simplifies the production process, reduces paper consumption, lowers production costs, and improves processing efficiency and output.

[0025] 3. Flexible folding mechanism: The unique horizontal and vertical folding design (including creases and cuts) allows the paper tray to be folded into a three-dimensional shape quickly and easily in one bi-directional fold without the need for additional fixing tools, which facilitates transportation and storage, optimizes the processing flow, and reduces the cost of the assembly stage.

[0026] 4. Enhanced protective performance: The combination of the inward folding surface and the adhesive ear, the design of the first to third folds, and the introduction and bending design of the L-shaped support strip further enhance the load-bearing capacity of the paper tray, forming a stable strip-shaped vertical edge structure. This not only ensures the stable shape transformation of the paper tray during the folding process, but also effectively improves the end protection and cushioning performance of the loaded items, reducing the risk of damage during transportation.

[0027] 5. Enhanced four-sided protection structure: The right-angle flange structure or square tube structure formed by the fifth to eighth creases, as well as the design of the bottom wing surface, not only increase the lateral stability of the paper tray, but also form an additional sandwich cushioning structure inside the carton, comprehensively improving the protection of the product.

[0028] 6. High adaptability: This invention can adjust the size and structure of each part according to actual needs, and is suitable for product packaging of various specifications. It can make adaptive adjustments to the position and length of each cut and crease according to the size and specifications of different products. It can increase the thickness of the cardboard support on the end side and front and back sides, the depth and thickness of the inner groove of the paper tray, etc., and has the characteristics of high flexibility, which can meet the packaging needs of different industries and different products.

[0029] 7. Environmentally friendly and sustainable: Because it is made of paper, the paper tray structure is fully recyclable, which is in line with current environmental protection trends and is conducive to demonstrating corporate social responsibility and achieving sustainable development goals. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the crease and cut position of a cardboard structure based on rapid folding of a single layer of cardboard according to the present invention.

[0031] Figure 2 This is a perspective view of a cardboard structure based on rapid folding of a single layer of cardboard according to the present invention;

[0032] Figure 3 This is a schematic diagram of the pre-folding and bonding process of a cardboard structure based on rapid folding of a single layer of cardboard according to the present invention.

[0033] Figure 4This is a schematic diagram of the paperboard structure extrusion molding process based on rapid folding of a single layer of paperboard according to the present invention;

[0034] Figure 5 This is a three-dimensional view of a paper tray based on rapid folding of a single layer of cardboard according to the present invention;

[0035] Figure 6 A schematic diagram showing the placement of a paper tray, formed by rapid folding of a single-layer cardboard according to the present invention, into a packaging box;

[0036] Figure 7 This is a schematic diagram of the cut and indentation positions of the cardboard structure formed by rapid folding in Example 2;

[0037] Figure 8 This is a perspective view of the cardboard structure formed by rapid folding in Example 2 after it has been folded into a paper tray;

[0038] Figure 9 This is a schematic diagram of the cut and indentation positions of the cardboard structure formed by rapid folding in Example 3;

[0039] Figure 10 This is a perspective view of the cardboard structure formed by rapid folding in Example 3 after it has been folded into a paper tray;

[0040] Figure 11-13 This is a schematic diagram illustrating how the paper tray based on the rapid folding of a single layer of cardboard can be adjusted according to the size of each indentation and cut to achieve structural changes.

[0041] in:

[0042] I. Basic structural surfaces: 1—bottom plate surface, 2—side plate surface, 3—inward folding surface, 4—L-shaped support strip, 5—outward folding surface, 6—lateral thickness surface, 7—bottom wing surface.

[0043] II. Key creases and cuts: 11—Horizontal fold crease, 12—Vertical fold cut, 13—Vertical fold crease, 14—Right-angle cut.

[0044] III. Auxiliary creases: 31—First crease, 32—Second crease, 33—Third crease, 34—Fourth crease, 35—Fifth crease, 36—Sixth crease, 37—Seventh crease, 38—Eighth crease.

[0045] IV. Bonding areas: 21—First bonding area, 22—Second bonding area, 23—Third bonding area, 24—Fourth bonding area. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0047] Example 1: A cardboard structure based on rapid folding of a single layer of cardboard, the overall cardboard structure having a cross-shaped central symmetrical layout, including:

[0048] The cardboard body, a one-piece molded cardboard board surface, includes a bottom board surface 1, two side board surfaces 2, and four inward folding surfaces 3. The top of the inward folding surfaces 3 has outwardly extending adhesive ears; the adhesive ears are the first adhesive parts 21.

[0049] There are two transverse folding creases 11, which are symmetrically arranged along the transverse centerline of the cardboard body. The bottom plate surface 1 is formed between the two transverse folding creases 11, and the side plate surface 2 is formed between the transverse folding creases 11 and the transverse edge of the side where they are located.

[0050] There are four vertical fold cuts 12, which extend vertically from the inner side of each adhesive ear to one end of the vertical fold crease 13 in the middle of the cardboard; the vertical fold cuts 12 form an inward folded surface 3 between the vertical edge of the vertical edge on the same side;

[0051] The inward folded surface 3 is provided with a first fold 31, a second fold 32, and a third fold 33 in sequence from the adhesive ear. The two third folds 33 on the same side form the second adhesive part 22. The inner side of the first adhesive part 21 is the vertical folding crease 13.

[0052] The L-shaped support strip 4 has a tongue with only one side being a connecting indentation at the intersection of the transverse folding indentation 11 and the folding line. The tongue can be bent into an L-shape. The width of the L-shaped support strip 4 is adapted to the width of the inward folding surface. The area between the fourth indentation 34 on the L-shaped support strip 4 and its end constitutes the third adhesive part 23.

[0053] In this embodiment, the cardboard body is a single-layer cardboard, which is cut and shaped by a die-cutting machine. At the same time, according to the requirements, the above-mentioned creases and indentations are pressed, and the vertical folding slits 12 and L-shaped support strips 4 are cut. It can then be used. If necessary, glue can be applied to the bonding parts by machine or manually. The inner folding surfaces 3 on both sides are folded over and folded along the vertical folding creases 13 on the two long sides of the cardboard. The bonding and orientation are completed by the first bonding part 21, the second bonding part 22, and the third bonding part 23. It can then be used for future purposes. When the goods need to be packed after being transported to the merchant's warehouse, each cardboard can be squeezed inward from both sides where the side panels are located. When squeezed, the two side panel surfaces 2 fold inward along the transverse folding crease 11. During this process, the inward folded surface 3 bends under the action of the second adhesive part 22, the third adhesive part 23 and the second and third folds 33. The inward folded surface 3 stands up and forms a strip-shaped upright edge structure. With the bending of the L-shaped support strip 4 that is bonded to it, the L-shaped support strip 4 is stretched and placed horizontally, thus forming a hollow paper frame structure with a support strip. The inward folded surfaces 3 at both ends are formed opposite each other and cooperate to form an end protection and buffer frame with equal thickness, height and width. When such a paper tray structure is placed in the carton, it can form a support structure for both ends and play the functions of support, protection and buffer.

[0054] Preferably, after the inward folded surface is folded inward along the vertical folding slit 12 and the vertical folding crease 13, the first adhesive part 21 of the adhesive ear can be used to be pasted downward to the back of the cardboard body, the second adhesive part 22 can be used to be pasted on the bottom plate surface 1, and the third adhesive part 23 can be used to be pasted on the inward folded surface after folding. After the two ends of the cardboard body are folded in half, they can be folded upright and facing each other along the horizontal folding crease 11. The inward folded surface unfolds inward relative to each other with the second adhesive part 22 as a fixed fulcrum and guided by the first fold 31 and the second fold 32. The first fold 31 and the bent edge of the adhesive ear form a first horizontal support surface, and the L-shaped support strip 4 is stretched to form a second horizontal support surface, thus forming a whole surface support frame. The three adhesive parts fix some areas of the inward folded surface while leaving others unfixed. Combined with the turning edge formed by the second fold 32 and the third fold 33, the unfixed part is stretched to form a folded surface structure, thereby forming the main body structure of the aforementioned support frame and enabling it to unfold. Both ends of the paper tray have such support frame structures, forming a support and buffer bracket structure in the direction of both end faces.

[0055] Preferably, the distance between the folded edge of the adhesive ear and the first fold 31 is equal to the distance between the root of the tongue of the L-shaped support strip 4 and the fourth indentation 34. Furthermore, the cut of the L-shaped support strip 4 is L-shaped, because one side of the cut coincides with the vertical fold cut 12, so there is no need to cut it again. The transverse cut of the L-shaped cut of the L-shaped support strip 4 partially coincides with the transverse fold indentation 11. This design ensures that after the inward folding surface is folded and unfolded, its size and shape are compatible with the overall size and structure of the paper tray.

[0056] Example 2: Based on Example 1, preferably, an outward folding surface 5 is reserved on the top edge of the side panel 2. The outward folding surface 5 is provided with two horizontal fold lines 35 and 36 that run through both ends. When folding and forming, the outward folding surface 5 bends outward along the fifth fold line 35 and the sixth fold line 36 to form an outward right-angle flange structure. A horizontal thickness surface 6 is formed between the fifth fold line 35 and the sixth fold line 36, and the adhesive ear is adhered to the horizontal thickness surface 6. This design aims to achieve a sandwich structure between the sides of the cardboard box and the side panels 2, increasing the thickness and space of the paper tray support in the side direction. Correspondingly, a right-angle slit 14 is provided in the middle section of the transverse folding crease 11, and the width of the right-angle slit 14 is equal to the width of the transverse thickness surface 6. This design allows the right-angle slit 14 to form a bottom wing surface 7 flush with the bottom panel 1 during folding, and the width of the bottom wing surface 7 is equal to the width of the transverse thickness surface 6. Therefore, the thickness provided by the right-angle folding structure is equal to the width of the bottom wing surface 7. After being placed in the packaging box, both the right-angle folding structure and the bottom wing surface 7 can contact the side wall of the packaging box and provide support to strengthen the overall strength of the side cavity, thereby achieving the overall protective function of the paper tray on the square.

[0057] Preferably, the width of the adhesive ear does not exceed the width of the transverse thickness surface 6; in this case, the first adhesive part 21 is adhered to the transverse thickness surface 6, which can further improve the strength of the transverse thickness surface 6.

[0058] Preferably, the fifth fold 35 is aligned with the bent edge of the adhesive ear. This dimensional design ensures that the formed inner lining tray has a rectangular shape, making it easy to pack into a carton.

[0059] Example 3: Building upon Example 2, the outward-folding surface 5 further includes two horizontal folds running through both ends: a seventh fold 37 and an eighth fold 38. This optimized design allows the outward-folding surface 5 to bend outwards along the fifth fold 35, sixth fold 36, seventh fold 37, and eighth fold 38 during folding. A fourth adhesive portion 24 is formed between the eighth fold 38 and the edge, and this fourth adhesive portion 24 is bonded to the outer surface of the side panel. The outward-folding surface 5, after folding, forms an outward-folding square tubular structure. Compared to optimizing the right-angle folded structure of Example 2 into a square tubular structure, the square tubular structure provides an additional supporting horizontal surface and is fixed by the fourth adhesive portion 24. Its overall shape is easier to maintain and provides better lateral support and strength.

[0060] Example 4: Based on the cardboard structure of the above three examples, a paper tray based on rapid folding of a single layer of cardboard can be obtained. Its structure includes: an inward folding surface, located on the left and right sides of the cardboard body, which can be folded inward and has two non-connected vertical slits along the folding line. The upper and lower ends of the inward folding surface are provided with two adhesive ears and several indentations; a bottom plate 1, which is formed between two transverse folding indentations 11 on the cardboard body; a side plate 2, which is formed between a transverse folding indentation 11 and the transverse edge of the cardboard on one side; and an L-shaped support strip 4, which has a tongue with only one side being a connecting indentation at the intersection of the transverse folding indentation 11 and the folding line. The tongue can be bent into an L-shape, and the width of the L-shaped support strip 4 is adapted to the width of the inward folding surface.

[0061] Preferably, after the inward folding surface is folded inward along the folding line, the adhesive ear can be used to be pasted downward on the back of the cardboard body, the middle part of the inward folding surface can be used to be pasted on the bottom plate surface 1, and the front end of the tongue can be used to be pasted on the inward folding surface after folding; after the two ends of the cardboard body are folded in half, they can be folded upright relative to each other along the transverse folding crease 11, and the inward folding surface unfolds relative to each other relative to each other under the guidance of the middle adhesive part and several creases, and the L-shaped support strip 4 is also stretched to form a transverse support, forming an end face support frame.

[0062] Preferably, it also includes: an outward folding strip, located at the top of the side panel 2, which can be folded into an outward right-angle folded edge structure by two horizontal fold lines 35 and 36 that run through both ends; or it can be folded into an outward square tube structure by four horizontal fold lines 35, 36, 37 and 38 that run through both ends.

[0063] The bottom wing surface 7 is formed by providing a right-angled edge cut 14 in the middle section of the transverse folding indentation 11. When folding and forming, the bottom wing surface 7 extends to both sides and remains flush with the bottom plate surface 1, and the width of the bottom wing surface 7 corresponds to and is equal to the width of the square tube structure or the right-angled flange structure.

[0064] This type of paper tray, through its ingenious folding and bonding structure, enables rapid prototyping and efficient utilization of cardboard, making it suitable for packaging and logistics applications and effectively improving the safety and stability of cargo transportation.

[0065] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A cardboard structure based on rapid folding of a single layer of cardboard, wherein the overall cardboard structure has a cross-shaped central symmetrical layout, characterized in that... include: The cardboard body, the cardboard board surface formed in one piece, includes a bottom board surface (1), two side board surfaces (2), and four inward folding surfaces (3). The top of the inward folding surfaces (3) has an outwardly extending adhesive ear; the adhesive ear is the first adhesive part (21). There are two transverse folding creases (11), which are symmetrically arranged along the transverse center line of the cardboard body. The bottom plate surface (1) is formed between the two transverse folding creases (11), and the side plate surface (2) is formed between the transverse folding creases (11) and the transverse edge on the side. There are four vertical fold cuts (12), which extend vertically from the inner side of each adhesive ear to one end of the vertical fold crease (13) in the middle of the cardboard; the vertical fold cuts (12) form an inward folded surface (3) between the vertical fold cuts (12) and the vertical edge of the corresponding side. The inward folded surface (3) is provided with a first fold (31), a second fold (32), and a third fold (33) in sequence from the adhesive ear. The two third folds (33) on the same side form a second adhesive part (22). The inner side of the second adhesive part (22) is the vertical folding crease (13). L-shaped support strip (4) has a tongue with only one side being a connecting indentation at the intersection of the transverse folding indentation (11) and the folding line. The tongue can be bent into an L-shape. The width of the L-shaped support strip (4) is adapted to the width of the inner folding surface. The area between the fourth indentation (34) on the L-shaped support strip (4) and its end constitutes the third adhesive part (23). After the inward folded surface is folded inward along the vertical fold cut (12) and vertical fold crease (13), the first adhesive part (21) of the adhesive ear can be used to stick downward to the back of the cardboard body, the second adhesive part (22) can be used to stick to the bottom plate surface (1), and the third adhesive part (23) can be used to stick to the inward folded surface after folding. After the two ends of the cardboard body are folded in half, they can be folded upright and facing each other along the horizontal fold crease (11). The inward folded surface unfolds inward relative to each other with the second adhesive part (22) as the fixed fulcrum and guided by the first crease (31) and the second crease (32). The first crease (31) and the bent edge of the adhesive ear form a first horizontal support surface, and the L-shaped support strip (4) is stretched to form a second horizontal support surface, thus forming a whole surface support frame.

2. The cardboard structure according to claim 1, characterized in that, The distance between the folded edge of the adhesive ear and the first crease (31) is equal to the distance between the root of the tongue of the L-shaped support strip (4) and the fourth indentation (34).

3. The cardboard structure according to claim 1, characterized in that, The transverse cut of the L-shaped cut of the L-shaped support strip (4) partially overlaps with the transverse folding indentation (11).

4. The cardboard structure according to claim 1, characterized in that, A section of outward folding surface (5) is reserved at the top edge of the side panel (2). The outward folding surface (5) is provided with two horizontal fifth fold lines (35) and sixth fold lines (36) that run through both ends. When folding and forming, the outward folded surface (5) bends outward along the fifth fold line (35) and the sixth fold line (36) to form an outward right-angle folded edge structure; A transverse thickness surface (6) is formed between the fifth crease (35) and the sixth crease (36), and the adhesive ear is adhered to the transverse thickness surface (6).

5. The cardboard structure according to claim 4, characterized in that, The middle section of the transverse folding indentation (11) is also provided with a right-angle side cut (14), and the width of the right-angle side cut (14) is equal to the width of the transverse thickness surface (6); When folding and forming, the right-angle side cut (14) forms a bottom wing surface (7) that is flush with the bottom plate surface (1). The width of the bottom wing surface (7) is equal to the width of the transverse thickness surface (6). The width of the adhesive ear does not exceed the width of the transverse thickness surface (6); The fifth crease (35) is on the same straight line as the bent edge of the adhesive ear.

6. The cardboard structure according to claim 4 or 5, characterized in that, The outward folded surface (5) also includes two horizontal folds running through both ends: the seventh fold (37) and the eighth fold (38). During the folding process, the outward folded surface (5) is bent outward along the fifth fold (35), the sixth fold (36), the seventh fold (37), and the eighth fold (38). The eighth fold (38) forms a fourth adhesive part (24) with the edge, and the fourth adhesive part (24) is bonded to the outer surface of the side panel. The outward folded surface (5) is folded to form an outward square tube structure.

7. A paper tray based on a cardboard structure formed by rapid folding of a single-layer cardboard as described in any one of claims 1-6, characterized in that... include: The inward folding surface is located on the left and right sides of the cardboard body. It can be folded inward and has two non-connected vertical slits along the folding line. There are two adhesive ears at the top and bottom ends of the inward folding surface, and several indentations are provided. The bottom surface (1) is formed by two transverse folding creases (11) on the cardboard body; The side panel (2) is formed by a transverse fold crease (11) to the transverse edge of the cardboard on one side; L-shaped support strip (4) has a tongue with only one side being a connecting indentation at the intersection of the transverse folding indentation (11) and the folding line. The tongue can be bent into an L-shape. The width of the L-shaped support strip (4) is adapted to the width of the inner folding surface.

8. The paper tray according to claim 7, characterized in that, After the inward folding surface is folded inward along the folding line, the adhesive ear can be used to stick downward to the back of the cardboard body, the middle part of the inward folding surface can be used to stick to the bottom plate (1), and the front end of the tongue can be used to stick to the inward folding surface after folding. After the two ends of the cardboard body are folded, they can be folded upright along the horizontal folding crease (11). The inward folded surface unfolds inward along the middle adhesive part and several creases. The L-shaped support strip (4) is also stretched to form a horizontal support, thus forming an end face support frame.

9. The paper tray according to claim 7, further comprising: The outward-folding strip, located at the top of the side panel (2), can be folded into an outward-folding right-angled flange structure through two horizontal fold lines (35 and 36) that run through both ends; or It can be folded into an outward-folding square tube structure through four horizontal folds: the fifth fold (35), the sixth fold (36), the seventh fold (37), and the eighth fold (38) that run through both ends; The bottom wing surface (7) is formed by a right-angled slit (14) in the middle section of the transverse folding indentation (11). When folded, the bottom wing surface (7) extends to both sides and remains flush with the bottom plate surface (1). The width of the bottom wing surface (7) is equal to the width of the square tube structure or the right-angled flange structure.

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