Paperboard structure and paper support formed by quickly folding single-layer paperboards

Abstract

The utility model discloses a paperboard structure and a paper support formed by quickly folding a single-layer paperboard, the paperboard is cut by a cutting die, folds and kerfs are preset, the paperboard comprises a bottom plate, side plates and an inner folding surface, and an embedded bonding lug is used as a first bonding part. Through the exquisite crease design, automatic forming can be achieved through two-way opposite extrusion. The inner folding surface is folded along a preset crease and is bonded for later use, so that the transportation and the storage are convenient; during assembly, by means of bending and fixing of the L-shaped supporting strips, stable strip-shaped vertical edges and a hollow-out supporting frame are formed. According to the design, the end protection buffer frame with the same size can be conveniently and rapidly assembled, and the end protection buffer frame is suitable for supporting and protecting commodities in a carton, has the advantages of efficient production and transportation convenience, small paper consumption and low cost, is high in forming efficiency and easy to operate during use, and greatly improves the labor efficiency and the yield during paper support forming.

Description

Technical Field

[0001] The utility model relates to the technical field of paper tray linings for packaging boxes, in particular to a paperboard structure formed by rapid folding of a single-layer paperboard and a paper tray. Background Art

[0002] Carton linings, especially paper tray products, play an increasingly important role in the field of modern packaging. They are favored for their environmental protection, recyclability and good cushioning properties:

[0003] 1. Environmental advantages: Paper trays are mainly made of pulp, which is a sustainable packaging solution that can be fully recycled and reused, meeting the growing global demand for environmental protection. Compared with traditional plastic foam materials, it has less impact on the environment after production and disposal.

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

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

[0006] 4. Cost-effectiveness: With the advancement of technology, the production cost of paper trays is relatively low, the production cycle is short, and the cost of raw materials is also relatively economical.

[0007] 5. Customized design: It can be customized according to the shape and protection requirements of different products, including waveform, trapezoid, semicircular and other structural elements to achieve the best protection effect.

[0008] However, the existing paper tray currently has the following shortcomings:

[0009] 1. Manual dependence: Some paper tray products still need to be folded and formed manually, especially in the production of paper trays with a high degree of customization and complex structure (support and buffer structures are required for the surrounding side walls to provide buffering requirements). The degree of automation is limited, which increases labor costs and production time.

[0010] 2. Structural complexity: For paper trays that need to have buffer protection on all sides or special shapes, multiple pieces of cardboard materials may need to be bonded and folded into shape. This not only increases material costs, but also affects the time spent on forming the paper tray, resulting in low efficiency of manual packing and reduced production capacity.

[0011] 3. Poor applicability: For different product packaging requirements, 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 cardboard molding. This leads to differences in the molding methods of paper trays of different specifications and models, which further increases the complexity of the manual processing process and reduces production capacity.

[0012] To sum up, although paper tray products have significant advantages in 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. Utility Model Content

[0013] The utility model is used to solve the shortcomings and defects of the above-mentioned prior art. The inventor has designed a new paperboard structure, which can quickly and conveniently form a paperboard lining based on a piece of integrated paperboard, can effectively improve the paper tray forming efficiency, and has excellent technical effects of stable support effect, small amount of paper and low cost. Specifically, the utility model is implemented as follows:

[0014] A paperboard structure formed by rapid folding of a single-layer paperboard, wherein the overall paperboard structure is in a cross-centered symmetrical layout, comprising:

[0015] The cardboard body is an integrally formed cardboard surface, which is divided by a plurality of transverse folds into: a bottom surface (1), two side surfaces (2) located at the upper and lower sides thereof, and inward folded surfaces (3) located at both ends separated by vertical folding slits (12);

[0016] After the inward folding surface (3) is folded inward, it is fixed to the bottom plate surface (1) and the side plate surface (2) by bonding; a bonding ear extending outward is left on the top of the inward folding surface (3); the bonding ear is the first bonding portion (21)

[0017] The L-shaped support strips (4) are respectively arranged at the ends where the side panel surface (2) and the bottom panel surface (1) are connected, and have only one side connected to the side panel surface, and are in a tongue-shaped structure. 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 end face of the L-shaped support strip (4) is a third bonding portion (23) for bonding and fixing with the contact surface of the inward folding surface (3) after inward folding.

[0018] On the other hand, the utility model provides a paper tray formed by quickly folding a single-layer paperboard, comprising:

[0019] The bottom plate surface (1) is formed between two transverse folding indentations (11) provided on the paperboard body and serves as the bottom surface of the paper support;

[0020] The side panel (2) is formed from a transverse folding indentation (11) to the transverse edge of the paperboard on one side; it is located on both sides of the bottom panel and vertically forms two side surfaces of the paper tray;

[0021] The end support frame is arranged at both ends between the two side panels (2) and is used to provide a thick paper frame support for the end surface; it is composed of an inward folded surface and an L-shaped support strip (4) that are bent.

[0022] The inward folding surface is located on the left and right sides of the paperboard body, can be folded inward, and two unconnected vertical slits are provided along the folding line. Two adhesive ears are provided at the upper and lower ends of the inward folding surface, and a plurality of indentations are provided, which can be unfolded and bent when the paperboard is extruded inwardly;

[0023] The L-shaped support strip (4) is provided with a tongue piece having only one side as a connecting indentation at the intersection of the transverse folding indentation (11) and the folding line, and the tongue piece 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; and the L-shaped support strip (4) can be unfolded and folded into shape when the paperboard is extruded inwardly into shape.

[0024] When it is needed, the side panels are squeezed inward to quickly deform the cardboard structure, and the inward folded surface is guided by the second and third folds and the bonding part to stand up, forming a strip-shaped vertical edge structure. The L-shaped support strip is laid horizontally with the structure unfolded to provide additional support. The final structure is a buffer frame with equal thickness, height and width that is closed at both ends. It is suitable for placement inside the carton, providing stable support and protection for the items, and has good buffering performance.

[0025] The working principle of the utility model: the cardboard structure of the utility model is an integral cardboard, which is made by automatic slitting, creasing and cutting and forming by a die-cutting machine. Its basic structure includes two side panels and a bottom panel divided by two transverse folding indentations. On the long sides of the two sides of the two cardboards, two inward-turned folded surfaces can be separated by vertical folding slits and vertical folding indentations as folding lines. The upper and lower ends of the inward-turned folded surfaces are provided with bonding ears and a first folding mark, a second folding mark and a third folding mark. The inward-turned folded surfaces are formed at the two long sides of the cardboard before folding with the bonding fixation of the first bonding part and the bonding ear; when the two side panels of the cardboard are squeezed inward from both ends of the cardboard, the cardboard is folded inward along the transverse folding indentations and stands up. In this process, the inward-turned folded surface is bent due to the fixation of the two bonding parts and the action of the second and third folding marks, and stands up in accordance with the trend after breaking away from the side of the cardboard, thereby forming a strip-shaped vertical edge structure, which is bonded with the bonding ears. The L-shaped support strip is bent and stretched horizontally to form a hollow paper frame structure with a supporting horizontal strip. The inward folded surfaces at both ends are formed opposite to each other and cooperate with each other to form an end protection buffer frame with equal thickness, height and width. Such a paper support structure is placed in the carton to form a bracket structure for the two ends, which plays a supporting, protective and buffering function; preferably, the fifth, sixth, seventh and eighth folds can be arranged on the long sides to form a right-angled flange structure or a square tube structure that rolls outward in the side direction. At the same time, a rectangular bottom wing surface can be reserved on the bottom plate surface through a right-angled edge cut. When the paper support is placed in the carton, the right-angled flange structure or the square tube structure cooperates with the bottom wing surface to form a sandwich structure relative to the side panels of the carton. The sandwich structure can also provide buffering protection and support, so that the formed paper support has the stable bracket function of protection, buffering and support on all sides.

[0026] Beneficial technical effects of the utility model:

[0027] 1. High efficiency of automated production: By using automated die-cutting knife equipment to complete modern and mature automatic processing and production such as slitting, creasing, and cutting, the processing cost is low. In combination with the use of automatic gluing and folding equipment, the production efficiency and consistency of the finished product can be improved, and the manufacturing cost can be reduced.

[0028] 2. Structural integrated design: The entire paper tray structure is made of a piece of integral cardboard, which reduces the assembly process, simplifies the production process, reduces the amount of paper used, reduces production costs, and improves processing efficiency and output.

[0029] 3. Flexible folding mechanism: The unique horizontal and vertical folding design (including indentation and slits) allows the paper tray to be folded in two directions once, so that it can be quickly and conveniently folded into a three-dimensional shape without the need for additional fixing tools, making it easy to transport and store, optimizing the processing flow and reducing the cost of the assembly stage.

[0030] 4. Enhanced protection performance: The coordination of the inward folding surface and the bonding 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, which 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 load, reducing the risk of damage during transportation.

[0031] 5. Enhanced four-sided protection structure: The right-angle flange structure or square tube structure formed by the fifth to eighth folds, 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 buffer structure inside the carton, thereby comprehensively improving the protection of the product.

[0032] 6. Strong adaptability: The utility model 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 slit and crease according to the size specifications of different products. It can increase the cardboard support thickness on the end side and front and back sides, the depth and thickness of the inner groove of the paper tray, etc. It has the characteristics of high flexibility and can meet the packaging needs of different industries and different products.

[0033] 7. Environmentally friendly and sustainable: Because it is made of paper materials, the paper tray structure is completely recyclable, which is in line with the current environmental protection trend and is conducive to the display of corporate social responsibility and the realization of sustainable development goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the crease and cut positions of a paperboard structure for rapid folding of a single-layer paperboard of the utility model;

[0035] Figure 2 A three-dimensional diagram of a cardboard structure formed by rapid folding of a single-layer cardboard according to the utility model;

[0036] Figure 3 It is a schematic diagram of the factory pre-folding and pasting forming process of a paperboard structure formed by rapid folding of a single-layer paperboard of the utility model;

[0037] Figure 4 It is a schematic diagram of the extrusion molding process of a single-layer paperboard structure formed by rapid folding of the utility model;

[0038] Figure 5 A three-dimensional diagram of a paper tray formed by rapid folding of a single-layer paperboard according to the utility model;

[0039] Figure 6 A schematic diagram of a paper tray formed by quickly folding a single-layer paperboard according to the utility model and putting it into a packaging box;

[0040] Figure 7A schematic diagram of the positions of the slits and indentations of the rapidly folded paperboard structure in Example 2;

[0041] Figure 8 A three-dimensional diagram of the rapidly folded paperboard structure in Example 2 after being folded into a paper tray;

[0042] Fig. 9 A schematic diagram of the positions of the slits and indentations of the rapidly folded paperboard structure in Example 3;

[0043] Fig.10 A three-dimensional diagram of the rapidly folded paperboard structure in Example 3 after being folded into a paper tray;

[0044] Figure 11-13 A schematic diagram showing that the paper tray formed by rapid folding of a single-layer paperboard can be adjusted according to the size of each indentation and cut to achieve structural changes;

[0045] in:

[0046] 1. Basic structural surfaces: 1—bottom plate surface, 2—side plate surface, 3—inward folding surface, 4—L-shaped support bar, 5—outward folding surface, 6—transverse thickness surface, 7—bottom wing surface.

[0047] 2. Key creases and slits: 11—horizontal folding indentation, 12—vertical folding indentation, 13—vertical folding indentation, 14—right-angle edge indentation.

[0048] 3. Auxiliary creases: 31—first crease, 32—second crease, 33—third crease, 34—fourth indentation, 35—fifth crease, 36—sixth crease, 37—seventh crease, 38—eighth crease.

[0049] 4. Bonding parts: 21 - first bonding part, 22 - second bonding part, 23 - third bonding part, 24 - fourth bonding part. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0051] Embodiment 1: A paperboard structure formed by rapid folding of a single-layer paperboard, wherein the paperboard structure is in a cross-centered symmetrical layout as a whole, comprising:

[0052] The cardboard body is an integrally formed cardboard panel, comprising a bottom panel 1, two side panels 2, and four inwardly turned folded panels 3. The top of the inwardly turned folded panels 3 is provided with an outwardly extending bonding ear; the bonding ear is a first bonding portion 21;

[0053] There are two transverse folding indentations 11, which are symmetrically arranged along the transverse midline of the paperboard body. The bottom panel surface 1 is formed between the two transverse folding indentations 11, and the side panel surface 2 is formed between the transverse folding indentations 11 and the transverse edge of the side.

[0054] There are four vertical folding slits 12, which extend vertically from the inner side of each bonding ear to one end of the vertical folding indentation 13 in the middle of the paperboard; the vertical folding slits 12 and the vertical edge of the side form an inverted folding surface 3;

[0055] 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 bonding ear, and the second bonding portion 22 is formed between the two third folds 33 on the same side, and the inner side edge of the first bonding portion 21 is the vertical folding indentation 13;

[0056] The L-shaped support strip 4 has a tongue piece with only one side being a connecting indentation formed at the intersection of the transverse folding indentation 11 and the folding line. The tongue piece 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 a third bonding portion 23.

[0057] The cardboard body in this embodiment is a single-layer cardboard, which is cut and formed by a die cutter. At the same time, according to the needs, the above-mentioned folds and indentations are pressed, and the vertical folding slits 12 and the slits of the L-shaped support strips 4 are cut; it can be used. If necessary, the bonding parts can be glued by machine or manually, and the inward folding surfaces 3 on both sides can be folded, folded along the vertical folding indentations 13 on the two long sides of the cardboard, and the bonding orientation is completed by the first bonding part 21, the second bonding part 22, and the third bonding part 23, and it can be used. When the goods are transported to the merchant's warehouse and need to be packed, each cardboard can be squeezed inward from both sides where the side panels are located. When squeezed, the two side panel surfaces 2 are folded inward along the transverse folding indentations 11 and stand up. In this process, the inward folding surface 3 is bent due to the fixation of the second adhesive portion 22 and the third adhesive portion 23 and the action of the second and third folding marks 33, and the inward folding surface 3 stands up accordingly to form a strip-shaped vertical edge structure. In conjunction with the bending of the L-shaped support strip 4 bonded thereto, the L-shaped support strip 4 is stretched and placed horizontally, thereby forming a hollow paper frame structure with supporting horizontal strips. The inward folding surfaces 3 at both ends are formed in opposition to each other, and cooperate with each other to form an end protection buffer frame of equal thickness, equal height, and equal width. Such a paper support structure is placed in a carton to form a bracket structure for the two ends, which plays the functions of support, protection, and buffering.

[0058] Preferably, after the inward folding surface is folded inward along the vertical folding slit 12 and the vertical folding indentation 13, the first bonding portion 21 of the bonding ear can be used to be pasted downward on the back side of the cardboard body, the second bonding portion 22 can be used to be pasted on the bottom plate surface 1, and the third bonding portion 23 can be used to be pasted on the folded inward folding surface; after the two ends of the cardboard body are folded in half, they can be folded and stood up along the transverse folding indentation 11, and the inward folding surface is relatively unfolded inward with the second bonding portion 22 as a fixed fulcrum under the guidance of the first fold 31 and the second fold 32, a first transverse support surface is formed between the first fold 31 and the bent edge of the bonding ear, and the L-shaped support strip 4 is stretched to form a second transverse support surface, forming an entire surface support frame. The three bonding parts make part of the inward folding surface fixed and part of it unfixed. With the turning edge formed by the second crease 32 and the third crease 33, the unfixed part is stretched to form a folding surface structure, thereby constituting the main body structure of the above-mentioned support frame to achieve unfolding. Both ends of the paper support have such a support frame structure, forming a support and buffer bracket structure in the direction of the two end surfaces.

[0059] Preferably, the distance between the folded edge of the bonding 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. The slit of the L-shaped support strip 4 is L-shaped, because one side of the slit overlaps with the vertical folding slit 12, so there is no need to cut again. The transverse slit of the L-shaped slit of the L-shaped support strip 4 partially overlaps with the transverse folding indentation 11. Such a design is used to ensure that after the inward folding surface is folded and unfolded, its size and shape are compatible with the overall size structure of the paper tray.

[0060] Embodiment 2: On the basis of Embodiment 1, preferably, an outward-turned fold surface 5 is reserved at the top edge of the side panel surface 2, and the outward-turned fold surface 5 is provided with two fifth folds 35 and sixth folds 36 which run transversely through both ends; when folding, the outward-turned fold surface 5 is bent outward along the fifth fold 35 and the sixth fold 36 to form an outward-turned right-angle flange structure; and a transverse thickness surface 6 is formed between the fifth fold 35 and the sixth fold 36, and the bonding ear is bonded to the transverse thickness surface 6. The purpose of such a design structure is to realize the sandwich design between the two side panels 2 relative to the carton wall, thereby thickening the paper support thickness and space in the side direction; accordingly, a right-angle side cut slit 14 is also provided in the middle section of the transverse folding indentation 11, and the width of the right-angle side cut slit 14 is correspondingly equal to the width of the transverse thickness surface 6; such a design enables the right-angle side cut slit 14 to form a bottom wing surface 7 flush with the bottom panel surface 1 during folding, and the width of the bottom wing surface 7 is correspondingly equal to the width of the transverse thickness surface 6; therefore, the thickness provided by the right-angle flange structure is equal to the width of the bottom wing surface 7, and after being loaded into the packaging box, the right-angle flange structure and the bottom wing surface 7 can both contact the side wall of the packaging box and provide support to strengthen the overall strength of the side clamping cavity; thereby realizing the overall paper support protection function on the square.

[0061] Preferably, the width of the bonding ear does not exceed the width of the transverse thickness surface 6; in this case, the first bonding portion 21 is bonded to the transverse thickness surface 6, which can also further improve the strength of the transverse thickness surface 6;

[0062] Preferably, the fifth fold 35 and the bent edge of the bonding ear are located on the same straight line. With such a size design, the formed lining paper tray is a rectangular space body as a whole, which is easy to be loaded into a carton.

[0063] Embodiment 3: On the basis of Embodiment 2, further, the outward-turned folding surface 5 also includes two transverse lines running through both ends, which are the seventh fold 37 and the eighth fold 38; with such an optimized design, when folding and forming, the outward-turned folding surface 5 is bent outward along the fifth fold 35, the sixth fold 36, the seventh fold 37, and the eighth fold 38, and a fourth bonding portion 24 is formed between the eighth fold 38 and the edge, and the fourth bonding portion 24 is bonded to the outer surface of the side panel; the outward-turned folding surface 5 is folded to form an outward-turned square tube structure. Compared with optimizing the right-angle flange structure of Embodiment 2 into a square tube structure, the square tube structure provides one more supporting horizontal surface and is fixed by the fourth bonding portion 24. Its overall shape is easy to keep fixed, providing better side support strength and intensity.

[0064] Embodiment 4: Based on the cardboard structure of the above three embodiments, a paper tray based on single-layer cardboard rapid folding can be obtained, and its structure includes: an inward folding surface, which is located on the left and right sides of the cardboard body and can be folded inward, and two unconnected vertical slits are provided along the folding line, and two adhesive ears are provided at the upper and lower ends of the inward folding surface, and a plurality of indentations are provided; a bottom panel surface 1, which is composed of two transverse folding indentations 11 provided on the cardboard body; a side panel surface 2, which is composed of a transverse folding indentation 11 to the transverse edge of the cardboard on one side; 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, and 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.

[0065] Preferably, after the inward folding surface is folded inwardly along the folding line, the adhesive ear can be used to be pasted downwardly on the back side of the paperboard 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 piece can be used to be pasted on the inward folding surface after being folded; after the two ends of the paperboard body are folded in half, they can be folded and stood up relative to each other along the transverse folding indentations 11, and the inward folding surface is relatively unfolded inwardly under the guidance of the middle adhesive part and several indentations, and the L-shaped support strip 4 is also stretched to form a transverse support, forming an end support frame.

[0066] Preferably, it also includes: an outward-turning folding strip, located at the top of the side panel 2, which can be turned into an outward-turning right-angle flange structure through two fifth folds 35 and sixth folds 36 that transversely run through both ends; or can be turned into an outward-turning square tube structure through four fifth folds 35, sixth folds 36, seventh folds 37, and eighth folds 38 that transversely run through both ends;

[0067] 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 folded, 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 is equal to the width of the square tube structure or the right-angled flange structure.

[0068] This type of paper tray, through its clever folding design and bonding structure, enables rapid forming and efficient use of cardboard. It is suitable for packaging and logistics fields, and can effectively improve the safety and stability of cargo transportation.

[0069] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A cardboard structure formed by rapid folding of a single-layer cardboard, wherein the overall cardboard structure is in a cross-centered symmetrical layout, characterized in that include: The cardboard body is an integrally formed cardboard panel, which is divided by a plurality of transverse folds into: a bottom panel (1), two side panels (2) located on the upper and lower sides thereof, and inward folded surfaces (3) located at both ends separated by vertical folding slits (12); After the inward folding surface (3) is folded inward, it is fixed to the bottom plate surface (1) and the side plate surface (2) by bonding; a bonding ear extending outward is left on the top of the inward folding surface (3); the bonding ear is the first bonding portion (21). The L-shaped support strips (4) are respectively arranged at the ends where the side panel surface (2) and the bottom panel surface (1) are connected, and have only one side connected to the side panel surface, and are in a tongue-shaped structure. 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-turned folding surface. The end surface of the L-shaped support strip (4) is a third bonding portion (23) for bonding and fixing with the contact surface of the inward-turned folding surface (3) after inward-turning and folding.

2. The paperboard structure according to claim 1, characterized in that: The plurality of transverse folds include: There are two transverse folding indentations (11) symmetrically arranged along the transverse midline of the paperboard body, the bottom plate surface (1) is formed between the two transverse folding indentations (11), and the side plate surface (2) is formed between the transverse folding indentations (11) and the transverse edge of the side on which they are located; There are four vertical folding slits (12), which extend vertically from the inner side edge of each bonding ear to one end of the vertical folding indentation (13) in the middle of the paperboard; an inverted folding surface (3) is formed between the vertical folding slit (12) and the vertical edge of the side on which it is located; 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 bonding ear, and the second bonding portion (22) is formed between the two third folds (33) on the same side, and the inner side edge of the first bonding portion (21) is the vertical folding indentation (13); The area between the fourth indentation (34) on the L-shaped support strip (4) and its end constitutes the third bonding portion (23).

3. The paperboard structure according to claim 2, characterized in that: After the inwardly turned folded surface is folded inwardly along the vertical folding slit (12) and the vertical folding indentation (13), the first adhesive portion (21) of the adhesive ear can be used to be adhered downwardly to the back side of the paperboard body, the second adhesive portion (22) can be used to be adhered to the bottom plate surface (1), and the third adhesive portion (23) can be used to be adhered to the inwardly turned folded surface after being folded; After the two ends of the paperboard body are folded in half, they can be folded and erected along the transverse folding indentation (11) to face each other, and the inward folded surface is relatively unfolded inwardly under the guidance of the first folding mark (31) and the second folding mark (32) with the second bonding portion (22) as a fixed fulcrum, so that a first transverse support surface is formed between the first folding mark (31) and the bent edge of the bonding ear, and the L-shaped support strip (4) is stretched to form a second transverse support surface, thereby forming a whole surface support frame; The distance between the folded edge of the bonding ear and the first fold mark (31) is equal to the distance between the root of the tongue of the L-shaped support strip (4) and the fourth indentation (34).

4. The paperboard structure according to claim 2, characterized in that: The transverse slit of the L-shaped slit of the L-shaped support strip (4) partially overlaps with the transverse folding indentation (11).

5. The paperboard structure according to claim 2, characterized in that: A section of outward folded surface 35 is reserved at the top edge of the side panel surface (2), and two fifth folds (35) and sixth folds (36) are provided on the outward folded surface (5) transversely running through the two ends; During folding, the outward-turned folding surface (5) is bent outward along the fifth folding line (35) and the sixth folding line (36) to form an outward-turned right-angled flange structure; A transverse thickness surface (6) is formed between the fifth fold (35) and the sixth fold (36), and the bonding ear is bonded to the transverse thickness surface (6).

6. The paperboard structure according to claim 5, characterized in that: A right-angled slit (14) is also provided in the middle section of the transverse folding indentation (11), and the width of the right-angled slit (14) is equal to the width of the transverse thickness surface (6); During folding and forming, the right-angled edge cut (14) forms a bottom wing surface (7) flush with the bottom plate surface (1), and the width of the bottom wing surface (7) is correspondingly equal to the width of the transverse thickness surface (6); The width of the bonding ear does not exceed the width of the transverse thickness surface (6); The fifth fold (35) and the bent edge of the bonding ear are located on the same straight line.

7. The paperboard structure according to claim 5 or 6, characterized in that: The outward-turned folded surface (5) also includes two transverse folds running through both ends, namely a seventh fold (37) and an eighth fold (38); During folding, the outward-turned folding surface (5) is bent outward along the fifth fold (35), the sixth fold (36), the seventh fold (37), and the eighth fold (38), a fourth bonding portion (24) is formed between the eighth fold (38) and the edge, and the fourth bonding portion (24) is bonded to the outer surface of the side panel; the outward-turned folding surface (5) is folded to form an outward-turned square tube-shaped structure.

8. A paper tray formed by rapid folding of a single-layer paperboard formed by folding the paperboard structure according to any one of claims 1 to 7, characterized in that include: The bottom plate surface (1) is formed between two transverse folding indentations (11) provided on the paperboard body; it serves as the bottom surface of the paper tray; The side panel (2) is formed from a horizontal folding indentation (11) to the horizontal edge of the paperboard on one side; it is located on both sides of the bottom panel and vertically forms two side surfaces of the paper tray; The end support frame is arranged at both ends between the two side panels (2) and is used to provide a thick paper frame support for the end surface; it is composed of an inward folded surface and an L-shaped support strip (4) that are bent. The inward folding surface is located on the left and right sides of the paperboard body, can be folded inward, and two unconnected vertical slits are provided along the folding line. Two adhesive ears are provided at the upper and lower ends of the inward folding surface, and a plurality of indentations are provided, which can be unfolded and bent when the paperboard is extruded inwardly; The L-shaped support strip (4) is provided with a tongue piece having only one side as a connecting indentation at the intersection of the transverse folding indentation (11) and the folding line, and the tongue piece 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; and the L-shaped support strip (4) can be unfolded and folded into shape when the paperboard is extruded inwardly into shape.

9. The paper tray according to claim 8, characterized in that: After the inward folding surface is folded inwardly along the folding line, the adhesive ear can be used to be pasted downwardly on the back side of the paperboard 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 piece can be used to be pasted on the folded inward folding surface; After the two ends of the paperboard body are folded in half, they can be folded and stood up along the transverse folding indentations (11) and the inward folded surfaces can be relatively unfolded inwardly under the guidance of the middle bonding part and the plurality of indentations. The L-shaped support strip (4) is also stretched to form a transverse support, thereby forming an end surface support frame.

10. The paper tray according to claim 8, characterized in that: Also included are: An outward-turning folding strip, located at the top of the side panel (2), can be folded into an outward-turning right-angled flange structure through two fifth folds (35) and a sixth fold (36) that transversely run through the two ends; or The structure can be folded into an outward-turned square tube-shaped structure through four fifth folds (35), a sixth fold (36), a seventh fold (37), and an eighth fold (38) which are transversely passed through both ends; 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 folded, 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) is equal to the width of the square tube structure or the right-angled flange structure.

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