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

Abstract

The utility model discloses a double-layer paperboard fast folding forming paperboard structure and a paper support, which comprise a first transverse crease, a second transverse crease, a third transverse crease and a first vertical kerf which jointly construct a basic paper support folding frame, an end supporting column surface is cooperated with an inner side board surface and an outer side board surface under the guidance of a specific crease to form a firm end supporting structure, and the paper support is used for supporting the paper support. An interlayer formed between the inner plate face and the outer plate face further consolidates the overall stability, the lateral supporting plate is changed into an L shape through the ingenious crease design, the lateral supporting force is remarkably enhanced, the end supporting frame is also designed to be similar to the L-shaped supporting strip design, and the design further shows various deformation schemes to meet different requirements. The L-shaped supporting strips and the supporting tongue pieces in different forms are achieved through specific kerfs and auxiliary creases, the stability of the ends and the strength of the edges are improved respectively, all assemblies are self-formed through simple folding, additional assembly is not needed, rapid three-dimensional transformation of paperboards is achieved, and the pressure bearing performance and the structural stability of the paper holder are greatly improved.

Description

Technical Field

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

[0002] Carton linings, especially paper trays, play an increasingly important role in the modern packaging field and are favored for their environmental friendliness, recyclability, and good cushioning properties.

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

[0004] 2. Wide range of applications: Suitable for a variety of industries, including but not limited to electronic products, food (such as eggs, fruits), precision instruments, glass and ceramic products, handicrafts, etc. It is especially suitable for the protection of 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 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 more economical.

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

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

[0009] 1. Dependence on manual labor: 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 structures (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 require all-around cushioning protection or special shapes, multiple sheets of cardboard may need to be bonded and folded together. This not only increases material costs but also takes time to form the paper trays, resulting in low manual packing efficiency and reduced production capacity.

[0011] 3. Poor applicability: For different product packaging requirements, the size, shape, protection and cushioning level, and 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, further increasing the complexity of the manual processing process and reducing 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] This utility model aims to address the shortcomings and defects of the above-mentioned existing technologies. The inventors have designed a new paperboard structure that can quickly and conveniently form a paperboard lining based on a single piece of integrated paperboard, effectively improving the efficiency of paper support forming, and achieving excellent technical effects such as stable support, low paper consumption, and low cost. Specifically, this utility model is achieved as follows:

[0014] A double-layer cardboard structure is formed by rapid folding. The cardboard body is in the shape of a long strip and is arranged symmetrically in the longitudinal direction. It has several transverse folds from both ends to the center, which include:

[0015] The lower bottom plate surface (12) and the back surface thereof are turned outward to form an overlapping portion with the bottom surface of the upper bottom plate surface (11), and are used as a first bonding portion (51) to bond with the bottom surface of the upper bottom plate surface (11);

[0016] The outer panel (14) can be used as the outer side of the paper holder after being folded outwards.

[0017] A folding top surface (15) is used to control the thickness of the interlayer gap between the outer panel (14) and the inner panel (13) after folding and forming, and to form a top surface;

[0018] The inner panel surface (13) and the end support surface (16) are partially separated by a first vertical slit, and the end support surface (16) is located at both ends of the inner panel surface (13) and is used to form bent column surfaces at both ends after folding and forming;

[0019] The upper bottom plate (11) has a bottom surface used for bonding and fixing with the lower bottom plate (12) after folding at both ends to form a double-layer bottom plate of the paper holder;

[0020] A lateral support plate (20) is provided on the outer panel (14) or the inner panel (13), and the lateral support plate (20) has only one transverse edge as a first auxiliary fold (31) for connection, and the remaining edges are n-shaped slits (22). The end section of the lateral support plate (20) serves as a second bonding portion (52), which is used to bond to the back surface of the inner panel (13) or the back surface of the outer panel (14) that contacts the inner panel after folding, and is used to unfold the lateral support surface after folding.

[0021] Working principle of the present invention: The cardboard structure design of the double-layer cardboard for rapid folding and forming of the present invention adopts a scientific and reasonable sophisticated die layout and crease design, aiming to achieve a packaging box lining solution with efficient forming and high structural strength. The first, second and third transverse folds and the first vertical slit constitute the basic folding and forming guide frame of the cardboard structure, wherein the first vertical slit divides the end support surface, and the fourth transverse fold defines the boundary of the folding top surface. These folds and slits jointly guide the folding and forming of the cardboard. The end support surface, guided by the shoulder fold and the third auxiliary fold, together with the inner panel and the outer panel, forms an end support frame, and the sandwich support frame formed between the inner panel and the outer panel further enhances the stability of the structure. The lateral support plate is folded to form an L-shaped support surface through the coordinated action of the first auxiliary fold, the second auxiliary fold and the second adhesive portion, providing additional support strength for the sandwich support frame. The utility model also has multiple variants: the first L-shaped support strip: through the L-shaped slit and the fourth and fifth auxiliary folds, it forms an expandable L-shaped support structure, enhancing the stability of the end support frame; the second L-shaped support strip: with the help of the second vertical slit, the sixth and seventh auxiliary folds, it creates a double-layer cardboard thickened L-shaped support, improving the strength of the vertical side of the support frame; the support tongue: composed of two right-angled slits, through the eighth and ninth auxiliary folds, it forms a simple L-shaped support, providing additional support for the end support surface. This utility model uses preset folds and slits to guide the cardboard to fold according to a predetermined pattern, thereby quickly forming a three-dimensional packaging frame with a support structure of a certain thickness layer, forming thickened support from both sides and both ends, effectively enhancing the pressure resistance and overall stability of the paper support structure.

[0022] Beneficial technical effects of the utility model:

[0023] 1. High efficiency of automated production: By adopting automated die-cutting knife equipment to complete cutting, creasing, cutting and other modern and mature automatic processing and production, the processing cost is low. In combination with the use of automatic viscose folding and molding equipment, it can improve production efficiency and consistency of finished products and reduce manufacturing costs.

[0024] 2. Structural integrated design: The entire paper support structure is made of a single piece of cardboard, which reduces assembly steps, simplifies the production process, reduces paper waste, and improves processing efficiency and output.

[0025] 3. Flexible folding mechanism: The unique horizontal crease and vertical slit folding design (including several auxiliary indentations) allows the paper tray to be folded in two directions once, and then 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 assembly process, and reducing the cost of the assembly and molding stage.

[0026] 4. Enhanced protection: The double-layer side panel structure is composed of inner and outer panels, as well as the end support surface structure. In addition, the L-shaped support strips and the structural design of the lateral support panels enable the L-shaped support strips and lateral support panels to bend to form an L-shaped support panel, further strengthening the support and protection capabilities of the end and side surfaces of the paper tray, forming a stable structure with vertical edges wrapped around the center. This not only ensures the stable shape transformation of the paper tray during the folding process, but also effectively enhances the protection and cushioning performance of the ends and sides of the load, reduces the risk of damage during transportation, and greatly improves the overall strength of the paper tray.

[0027] 5. 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 thickness of the cardboard support on the end side and the front and back sides, the thickness of the end frame and other dimensions, which can all be adaptively adjusted. It has the characteristics of high flexibility and can provide a variety of molding forms to meet the packaging needs of different industries and different products.

[0028] 6. Environmentally friendly and sustainable: Since it is made of paper materials, the paper support 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

[0029] Figure 1 This is a schematic diagram of the structure of a double-layer cardboard quick folding cardboard structure of the utility model;

[0030] Figure 2 It is a schematic diagram of the process of pre-folding and bonding the bonding part of the double-layer paperboard rapid folding forming paperboard structure of the utility model;

[0031] Figure 3 A schematic diagram of the folding and forming process of a double-layer paperboard structure for rapid folding and forming in accordance with the present invention;

[0032] Figure 4 A three-dimensional diagram of the paper support after folding and forming the double-layer paperboard quick folding and forming paperboard structure of the utility model;

[0033] Figure 5 This is a schematic diagram of the actual packing and use of the folded paper tray after the double-layer paperboard quick folding paperboard structure of the utility model;

[0034] Figure 6 Schematic diagram of the structure of the double-layer cardboard quick folding cardboard structure in Example 2;

[0035] Figure 7 Schematic diagram of the process of pre-folding and bonding the bonding parts of the double-layer paperboard rapid folding forming paperboard structure in Example 2;

[0036] Figure 8 A three-dimensional view of the paper support after folding the double-layer paperboard structure formed by rapid folding in Example 2;

[0037] Figure 9 Schematic diagram of the structure of the double-layer cardboard quick folding cardboard structure in Example 3;

[0038] Figure 10 A three-dimensional view of the paper support after folding the double-layer paperboard structure formed by rapid folding in Example 3;

[0039] Figure 11 Schematic diagram of the structure of the double-layer cardboard quick folding cardboard structure in Example 4;

[0040] Figure 12 A three-dimensional view of the paper support after folding and forming the double-layer paperboard structure formed by rapid folding in Example 4;

[0041] in:

[0042] Foundation structure surface: 11—upper floor surface, 12—lower floor surface, 13—inner side surface, 14—outer side surface, 15—folded top surface, 16—end support surface;

[0043] Reinforcement structure: 20 - lateral support plate, 21 - first L-shaped support bar, 22 - n-shaped slit, 23 - double right-angle slit, 24 - support tongue;

[0044] Key creases and slits: 41—first transverse crease, 42—second transverse crease, 43—third transverse crease, 44—fourth transverse crease, 45—first vertical slit, 46—second vertical slit;

[0045] Auxiliary creases and slits: 30—shoulder crease, 31—first auxiliary crease, 32—second auxiliary crease, 33—third auxiliary crease, 34—fourth auxiliary crease, 35—fifth auxiliary crease, 36—sixth auxiliary crease, 37—seventh auxiliary crease, 38—eighth auxiliary crease, 39—ninth auxiliary crease;

[0046] Adhesive parts: 51 - first adhesive part, 52 - second adhesive part, 53 - third adhesive part, 54 - fourth adhesive part, 55 - fifth adhesive part. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0048] Example 1: A double-layer cardboard structure formed by rapid folding, wherein the cardboard structure is in the shape of a long strip and is symmetrical in the longitudinal direction;

[0049] The cardboard body is an integrally formed cardboard panel, comprising an upper bottom panel 11 at the center, two inner side panels 13, two outer side panels 14, two folded top panels 15, and a lower bottom panel 12 at the upper and lower ends of the cardboard. The back of the lower bottom panel 12 is turned outward, and the overlapping portion with the upper bottom panel 11 forms a first adhesive portion 51.

[0050] There are two first transverse folds 41, which are arranged in the middle of the paperboard body and are symmetrically arranged about the transverse midline. The upper bottom plate surface 11 is formed between the two first transverse folds 41;

[0051] The second transverse folds 42 are two in number and run through the wide side of the paperboard body, serving as the connecting folding edges between the inner panel 13 and the outer panel 14.

[0052] There are four first vertical slits 45, each coinciding along two vertical sides of the two inner panels 13. The bottom ends of the first vertical slits 45 extend beyond the first transverse fold 41, but the two first vertical slits 45 are not connected to each other, and the top ends are not connected to the second transverse fold 42. The bottom ends of the first vertical slits 45 extend transversely to the edge of the paperboard to form an end support surface 16. The bottom edge of the end support surface 16 is the third auxiliary fold 33 connected to the first vertical slits 45, and the top edge is the shoulder fold 30. The line connecting the top ends of the two first vertical slits 45 on the same inner panel 13 forms a fourth transverse fold 44.

[0053] There are two third transverse folds 43, which are transversely arranged at both ends of the cardboard body. The area between the third transverse folds 43 and the edge of the end of the cardboard body serves as the lower bottom plate surface 12;

[0054] The lateral support plate 20, at least one on each side, is opened on the inner plate surface 13 or the outer plate surface 14, with only one transverse edge being a first auxiliary fold 31 for connection, and the remaining edges being n-shaped slits 22. A second auxiliary fold 32 is transversely arranged in the middle of the lateral support plate 20, and the back surface between the second auxiliary fold 32 and the n-shaped slit 22 serves as a second bonding portion 52.

[0055] The cardboard structure of the present invention is a single sheet of cardboard, automatically slit, creased, and cut using a die-cutting machine. It can then be manually folded and glued together automatically. Its core feature is that a single sheet of cardboard is pre-folded and glued together to form a double-layer panel. The cardboard body is long and symmetrical, with an upper bottom panel 11 at the center and lower bottom panels 12 at either end. The outer panels 14 are folded outward using a first bonding portion 51 and a second transverse fold 42, positioning the lower bottom panel 12 below the upper bottom panel 11 and providing a bonding area half that of the upper bottom panel 11. After the two ends of the cardboard are similarly folded and glued together, the lower bottom panel 12 at the other end is also glued to the other half of the upper bottom panel 11, forming a butt joint. This creates a double-layered cardboard structure with overlapping inner and outer panels 13 and 14. This ensures the double-layered bottom panels are securely fixed, enhancing the strength and stability of the bottom structure and facilitating transportation and storage.

[0056] When in use, the two inner panels 13 of the cardboard are squeezed inward from both ends, and the cardboards at both ends will stand up and fold inward along the first transverse fold 41. In this process, due to the joint guidance of the shoulder fold 30, the second transverse fold 42, and the third auxiliary fold 33, the end support surface 16 will detach from the outer panel 14 and stand up, thereby forming a strip-shaped vertical edge structure, and the inner panel 13, under the guidance of the second transverse fold 42 and the fourth transverse fold 44, also detaches from the outer panel 14 and stands up. At this time, the folded top surface 15 is also formed, thereby forming an interlayer cavity formed between the outer panel 14 as a whole; thereby forming a thickness paper frame support in four directions at both ends and on both sides, and a cavity area for placing objects is formed in the middle, which, together with the bottom surface of the double-layer cardboard, forms a multi-faceted protective support structure for the built-in objects.

[0057] Preferably, the height dimensions of the outer panel 14 and the inner panel 13 are adapted to correspond to each other, so that after the outer panel 14 is folded outward along the second transverse fold 42, the lower bottom panel 12 can overlap with half of the transverse midline of the upper bottom panel 11, and the distance between the third transverse fold 43 and the third auxiliary fold 33 after folding is equal to the distance between the second transverse fold 42 and the shoulder fold 30; the distance between the shoulder fold 30 and the top of the first vertical slit 45 is equal to the distance between the third auxiliary fold 33 and the bottom of the first vertical slit 45; the distance between the shoulder fold 30 and the third auxiliary fold 33 is equal to the distance between the first transverse fold 41 and the fourth transverse fold 44; and the distance between the first auxiliary fold 31 and the second auxiliary fold 32 is equal to the distance between the fourth transverse fold 44 and the second transverse fold 42. The paper tray formed in this way is generally cubic in shape, with a regular rectangular frame, and can adapt to most common packaging boxes.

[0058] In this embodiment, the lateral support plate 20 is arranged in the middle of the inner panel 13. During the folding process, the inner panel 13 and the outer panel 14 separate. Since both ends of the lateral support plate 20 are fixed respectively, they are pulled apart horizontally between the two to form an L-shaped support surface structure that supports the facade function.

[0059] Specifically, after the outer panel surface 14 is folded outward along the second transverse fold 42, it is bonded to the first bonding portion 51 in the overlapping area of ​​the back of the upper bottom panel surface 11 and the back of the lower bottom panel surface 12, and the second bonding portion 52 is bonded to the back contact area of ​​the outer panel surface 14, so that after the two ends of the cardboard body are folded in half, they can be folded and stood up opposite each other along the two first transverse folds 41, and the end support surfaces 16 are relatively unfolded inwardly under the guidance of the shoulder fold 30 and the third auxiliary fold 33 to form end support frames at the two end surfaces. After the inner panel surface 13 and the outer panel surface 14 are unfolded along the first transverse fold 41, the second transverse fold 42, and the fourth transverse fold 44, a side sandwich support frame is formed. The side support plate 20 is bent toward the inner side of the sandwich under the guidance of the second bonding portion 52, the first auxiliary fold 31, and the second auxiliary fold 32 to form a side L-shaped support surface, providing support strength for the side sandwich support frame.

[0060] This structural design improves the overall support strength of the end and side frames: For the side frames, lateral support plates 20 can be set on either the inner panel 13 or the outer panel 14. Through the coordinated action of the first auxiliary fold 31, the second auxiliary fold 32, and the second adhesive portion 52, an L-shaped support surface is folded to provide additional support strength for the side sandwich support frame. For the end frames, L-shaped support strips 21 or support tongue structures are also formed at the two side edges of the outer panel 14 through the design of slits and folds. Combined with the fixed position of the adhesive portion and the pulling and forming of the folds during the folding process, an L-shaped support surface can also be formed to provide overall strength for the end support frame. Both can be pulled, unfolded, and formed during the folding process of the cardboard without any additional operations. While ensuring assembly efficiency, the support and protection strength of the paper support is also guaranteed, and a paper support structure with four-way support protection can be quickly formed.

[0061] Example 2: L-shaped slits are provided on both side edges of the outer panel 14, and a first L-shaped support strip 21 with only one connecting folded edge is cut out, and a fourth auxiliary fold 34 and a fifth auxiliary fold 35 are provided. The fourth auxiliary fold 34 is transversely connected to the end points of the L-shaped slit, and a third bonding portion 53 is formed between the fifth auxiliary fold 35 and the end of the first L-shaped support strip 21. After the outer panel 14 is turned outward along the second transverse fold 42, the third bonding portion 53 is bonded and fixed to the back of the end pillar surface 16, so that during extrusion molding, the first L-shaped support strip 21 can be stretched and expanded to form an L-shaped support, providing support strength for the end support frame of the end face.

[0062] In this embodiment, specific structural elements are introduced on the outer panel 14 of the packaging box to enhance the support strength of its ends and ensure that the structure remains stable when subjected to external pressure. L-shaped slits and support strips L-shaped slits are designed on both sides of the outer panel 14. This slit not only defines the position and shape of the first L-shaped support strip 21, but also retains a connecting fold to ensure the connectivity of the support strip with the main structure. Such a design allows the support strip to be easily unfolded when needed while maintaining connection with the main panel to avoid accidental falling off during use. In order to further optimize the unfolding and positioning of the support strip, a fourth auxiliary fold 34 is laterally arranged at the end point of the L-shaped slit. The function of this fold is to guide the support strip to unfold in the correct direction; at the same time, the fifth auxiliary fold 35 extends from the end of the support strip to its expected position after unfolding, and together with the fourth auxiliary fold 34, defines the bonding position of the third bonding portion 53. This bonding process not only establishes a physical connection but, more importantly, ensures that the first L-shaped support strip 21 can be stretched and expanded with the movement of the outer panel 14 during the extrusion process, ultimately forming a stable L-shaped support structure. When the package is compressed, the first L-shaped support strip 21 quickly expands and locks into place, forming an L-shaped support, significantly enhancing the structural strength of the end support frame.

[0063] Example 3: A second vertical slit 46 is provided on both sides of the outer panel 14, starting from the middle and extending to the outside of the edge. A second L-shaped support strip is cut out on each side of the outer panel 14. A sixth auxiliary fold 36 and a seventh auxiliary fold 37 are provided on the second L-shaped support strip. The sixth auxiliary fold 36 is laterally connected to the end point of the second vertical slit 46. A fourth bonding portion 54 is formed between the seventh auxiliary fold 37 and the end of the second L-shaped support strip. After the outer panel 14 is turned outward along the second transverse fold 42, the fourth bonding portion 54 is bonded and fixed to the back of the end support surface 16, so that during extrusion molding, the second L-shaped support strip can be stretched and expanded to form an L-shaped support, providing support strength for the end support frame of the end face, and providing a double-layer cardboard thickening support effect for the vertical edge of the support frame.

[0064] In this embodiment, a second L-shaped support strip is provided. In this embodiment, the two edges of the outer panel 14 are carefully designed, each with a second vertical slit 46 extending from the center of the panel to the outer edge. This design is both ingenious and practical, effectively dividing the outer panel 14 into two second L-shaped support strips. This structural change provides a foundation for subsequent folding and reinforcement. To ensure that the second L-shaped support strip can be correctly and securely unfolded during the final molding process, two auxiliary folds are incorporated into the design: a sixth auxiliary fold 36 and a seventh auxiliary fold 37. The sixth auxiliary fold 36 runs horizontally through the two endpoints of the second vertical slit 46, helping to guide and control the folding direction of the L-shaped support strip. The seventh auxiliary fold 37 is located near the end of the second L-shaped support strip and, together with the sixth auxiliary fold 36, defines a region known as the fourth bonding portion 54. When the outer panel 14 is folded outward along the second transverse fold 42 as designed, the fourth adhesive portion 54 is precisely aligned and bonded to the inner back of the end support surface 16. This arrangement ensures that during the actual extrusion process, the second L-shaped support strip can be smoothly stretched and expanded, ultimately forming a stable L-shaped structure, providing significantly enhanced support strength for the end support frame. The structural design of this embodiment also strengthens the strength of the end support surface 16. Due to the use of the second vertical slit 46, the fourth adhesive portion 54 of the second L-shaped support strip is longer and adhered to the end support surface 16, forming a thickened structure at the bottom of the end support surface 16, similar to a double layer of cardboard, further enhancing the vertical and lateral support strength of the end support surface 16.

[0065] Example 4: Support tongues 24 having only one connecting fold on one side are provided at both ends of an outer panel surface 14. The support tongue 24 is formed by a double right-angle slit 23 and includes an eighth auxiliary fold 38 and a ninth auxiliary fold 39. A fifth bonding portion 55 is formed between the ninth auxiliary fold 39 and the end of the support tongue 24. After folding, the fifth bonding portion 55 is bonded to the back of the end support surface 16, so that during extrusion molding, the support tongue 24 can be stretched and expanded to form an L-shaped support, providing support strength for the end support frame formed by the end support surface 16. Preferably, the first vertical slit 45 or the second vertical slit 46, as well as the n-shaped slit 22, are groove structures with a diameter of not less than 1 mm, the bend of the n-shaped slit 22 being rounded, and the ends of the groove structure being arc-shaped.

[0066] In this embodiment, another L-shaped support strip design is provided, namely, a support tongue 24. This structure is a local optimization of the two ends of the outer panel 14 and is generally suitable for use when a wider end frame structure is required. When it is necessary to increase the support strength of the end, that is, the width of the end support surface 16 is generally greater than 7 cm. At this time, if the support strip is cut out from the outer panel 14 as in the structures in Examples 2 and 3, the overall area of ​​the outer panel 14 will be reduced, weakening the support strength of the side. Therefore, a special support structure is designed and implemented at each end of the outer panel 14: a support tongue 24. These support tongues 24 are cut by precise double right-angle slits 23, and each slit retains a connecting fold on only one side. This design not only ensures a firm connection between the support tongue 24 and the outer panel 14, but also facilitates free folding and unfolding when necessary. The support tab 24 is also cleverly designed with an eighth auxiliary fold 38 and a ninth auxiliary fold 39. The eighth auxiliary fold 38 runs transversely along one side of the slit, ensuring the folding direction and precision of the support tab 24. The ninth auxiliary fold 39 extends to near the tip of the support tab 24 and, together with the eighth auxiliary fold 38, defines a fifth bonding portion 55. During the assembly or molding process, the outer panel 14 is folded along the pre-designed folds, and the fifth bonding portion 55 precisely aligns and bonds to the back of the end support surface 16. This bonding step is not only simple and efficient, but also ensures that the support tab 24 unfolds smoothly and stably into an L-shaped structure when subjected to compression or weight, providing strong support for the end support frame formed by the end support surface 16. This structural design not only significantly improves the load-bearing capacity of the end, but also effectively distributes pressure, reducing the risk of deformation or damage caused by external forces. It is particularly suitable for packaging heavy or fragile items. Example 4, through the innovative design of the support tongue 24, not only optimizes the stability and durability of the packaging structure, but also demonstrates how to maximize functionality and efficiency through sophisticated structural design under limited material and space conditions, providing an efficient and practical solution for the packaging industry.

[0067] Example 5: A paper tray formed by quickly folding a double-layer paperboard, comprising:

[0068] The double-layer bottom panel comprises an upper bottom panel surface 11 and a lower bottom panel surface 12 bonded and fixed to the bottom surface of the upper bottom panel surface 11 by a first bonding portion 51 formed by overlapping.

[0069] The outer panel 14 is connected to the lower bottom panel 12 via a third transverse fold 43 and can form a perpendicular plane relationship along the third transverse fold 43 after folding;

[0070] The folded top surface 15 is connected to the outer panel surface 14 via a second transverse fold 42 and connected to the inner panel surface 13 via a fourth transverse fold 44. The plane formed between the second transverse fold 42 and the fourth transverse fold 44 is the folded top surface 15.

[0071] The inner panel 13 is formed between the fourth transverse fold 44 and the first transverse fold 41 and is connected to the upper bottom panel 11 through the first transverse fold 41;

[0072] The end support surface 16 is formed by semi-separating the two ends of the inner panel 13 through the first vertical slit 45. Its upper and lower ends are respectively connected to the folded top surface 15 and the upper bottom panel 11 by the shoulder fold 30 and the third auxiliary fold 33. The end support surface 16, the outer panel 14 and the lower bottom panel 12 together form an end support frame structure; the height of the end support surface 16, the inner panel 13 and the outer panel 14 are all maintained at the same level.

[0073] The lateral support plate 20 is opened on the outer panel surface 14 or on the outer panel surface 14, with at least one on each surface. The transverse edge of the lateral support plate 20 is the first auxiliary fold 31 of the connecting edge. Through the fixation of the second adhesive portion 52 and the guidance of the second auxiliary fold 32, it can be L-shaped after folding. The L-shaped support surface is connected between the inner panel surface 13 and the outer panel surface 14, and its width is equal to the thickness of the interlayer between the inner panel surface 13 and the outer panel surface 14.

[0074] Preferably, a first L-shaped support strip 21 is provided on both sides of the outer panel 14, cut inward along the edge of the outer panel 14 based on an L-shaped slit; or a second L-shaped support strip 21 is cut based on a second vertical slit 46 and penetrates to the long side of the lower bottom panel 12;

[0075] The first L-shaped support strip 21 and the second L-shaped support strip 21 are respectively provided with a fourth auxiliary fold 34 and a fifth auxiliary fold 35, and a sixth auxiliary fold 36 and a seventh auxiliary fold 37, respectively forming a third bonding portion 53 and a fourth bonding portion 54, both of which are used to bond and fix to the bottom surface of the end support surface 16 after folding, so that after the paper tray is folded into shape, an L-shaped support is formed between the end support surface 16 and the outer panel surface 14.

[0076] Preferably, support tongues 24 with only one connecting edge cut along the double right-angle slits 23 are provided on both sides of the outer panel surface 14. The width of the support tongue 24 is smaller than the width of the end support surface 16. The support tongue 24 is bonded to the bottom surface of the end support surface 16 through the eighth auxiliary fold 38 and the ninth auxiliary fold 39, in conjunction with the fifth bonding portion 55. After the paper tray is folded into shape, an L-shaped support is formed between the end support surface 16 and the outer panel surface 14.

[0077] When actually using the paper holder in this embodiment:

[0078] During the product packaging process, the paper tray folding and forming method of this embodiment can be used to quickly and efficiently pack the product into the packaging box and provide comprehensive protection for the product.

[0079] 1. Initial Preparation: Ensure that all folds on the paper support, such as the first to fourth transverse folds 44, the shoulder fold 30, the third auxiliary fold 33, and the slits, are pre-pressed or cut to facilitate smooth folding. Based on different size requirements, determine the correct paper support board structure for the specific structure.

[0080] 2. Folding and forming: Extruding the inner panels 13: First, gently squeeze the two inner panels 13 inward from both ends of the paper support. As pressure is applied, the first transverse crease 41 guides the inner panels 13 to stand up inward, while the end support surfaces 16 are affected by the shoulder crease 30, the second transverse crease 42 and the third auxiliary crease 33, automatically detaching from the outer panel 14 and standing up to form a support structure at both ends. As the inner panel 13 stands up along the second transverse crease 42 and the fourth transverse crease 44, the folded top surface 15 is also formed, forming an open cavity in the middle for placing the product, and the double-layer bottom panel provides support for the bottom. During this extrusion and folding process, the lateral support plate 20 utilizes the creases and adhesive portions on the outer panel 14 to fold into an L-shaped structure, connected between the inner panel 13 and the outer panel 14, further enhancing the support strength of the side. At the same time, the two ends of the paper holder can also unfold to form a stable L-shaped support frame during the folding process through the end support surface 16 and the specific folding design, thereby increasing the load-bearing capacity of the end.

[0081] 3. Completion and Use: The paper tray automatically forms a full-scale support structure around the sides and bottom, leaving a cavity in the center for the product. At this point, the paper tray can be quickly packed into the box. The entire process is designed to be both simple and efficient, ensuring rapid packaging and product safety, making it suitable for large-scale production operations.

[0082] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A double-layer cardboard quick folding cardboard structure, characterized in that The cardboard body is in the shape of a long strip and is symmetrical in the length direction. Through a number of transverse folds, it includes: The lower bottom plate surface (12) can form an overlapping portion with the bottom surface of the upper bottom plate surface (11) after the back surface is turned outward, and is used as a first bonding portion (51) to bond with the bottom surface of the upper bottom plate surface (11); the outer plate surface (14) can serve as the outer side surface of the paper tray after being turned outward and folded. A folding top surface (15) is used to control the thickness of the interlayer gap between the outer panel surface (14) and the inner panel surface (13) after folding and forming, and to form a top surface; The inner panel surface (13) and the end support surface (16) are partially separated by a first vertical slit, and the end support surface (16) is located at both ends of the inner panel surface (13) and is used to form bent column surfaces at both ends after folding and forming; the upper bottom panel surface (11) has a bottom surface used to be bonded and fixed to the lower bottom panel surface (12) after folding and forming at both ends, so as to form a double-layer bottom panel of the paper tray; A lateral support plate (20) is arranged on the outer panel surface (14) or the inner panel surface (13), and the lateral support plate (20) has only one transverse edge as a first auxiliary fold (31) for connection, and the other edges are n-shaped slits (22). The end section of the lateral support plate (20) serves as a second bonding portion (52) for bonding to the back side of the inner panel surface (13) or the back side of the outer panel surface (14) which contacts the inner panel surface after folding, so as to unfold the lateral support surface after folding.

2. The double-layer paperboard rapid folding forming paperboard structure according to claim 1, characterized in that: The plurality of transverse folds include: Two first transverse folds (41) are arranged in the middle of the paperboard body and are arranged symmetrically along the transverse midline. An upper bottom plate surface (11) is formed between the two first transverse folds (41); The second transverse folds (42) are two in number and extend transversely through the wide surface of the paperboard body, serving as the connecting folding edges of the inner panel surface (13) and the outer panel surface (14). There are four first vertical slits (45), which overlap along the two vertical sides of the two inner panels (13), and the bottom ends of the first vertical slits (45) are all beyond the first transverse fold (41), but the two first vertical slits (45) are not connected to each other, and the top ends are not connected to the second transverse fold (42); the bottom ends of the first vertical slits (45) and the edge of the paperboard form an end support surface (16), the bottom edge of the end support surface (16) is the third auxiliary fold (33) connected to the first vertical slits (45), and the top edge is the shoulder fold (30); the line connecting the top ends of the two first vertical slits (45) on the same inner panel (13) forms a fourth transverse fold (44); There are two third transverse folds (43) which are transversely arranged at the two ends of the paperboard body, and the area between the third transverse folds (43) and the edge of the end of the paperboard body serves as the lower bottom plate surface (12).

3. The paperboard structure according to claim 2, characterized in that: The height dimensions of the outer panel (14) and the inner panel (13) are matched and matched, so that after the outer panel (14) is folded outward along the second transverse fold (42), the lower bottom panel (12) can overlap with the half of the upper bottom panel (11) divided by the transverse midline, and the distance from the third transverse fold (43) to the third auxiliary fold (33) after folding is equal to the distance from the second transverse fold (42) to the shoulder fold (30); The distance between the shoulder fold (30) and the top end of the first vertical slit (45) is equal to the distance between the third auxiliary fold (33) and the bottom end of the first vertical slit (45); the distance between the shoulder fold (30) and the third auxiliary fold (33) is equal to the distance between the first transverse fold (41) and the fourth transverse fold (44); The distance between the first auxiliary fold (31) and the second auxiliary fold (32) is equal to the distance between the fourth transverse fold (44) and the second transverse fold (42).

4. The paperboard structure according to claim 3, characterized in that: After the outer panel (14) is folded outward along the second transverse fold (42), the first bonding portion (51) is bonded to the overlapping area between the back of the upper bottom panel (11) and the back of the lower bottom panel (12), and the second bonding portion (52) is bonded to the back contact area of ​​the outer panel (14), so that after the two ends of the paperboard body are folded in half, they can be folded and stood up along the two first transverse folds (41) to face each other, and the end support surface (16) is guided by the shoulder fold (30) and the third auxiliary fold (33). , unfolded relatively inwardly to form end support frames at both end surfaces, and a side sandwich support frame is formed between the inner plate surface (13) and the outer plate surface (14) after unfolding along the first transverse fold (41), the second transverse fold (42), and the fourth transverse fold (44), and the side support plate (20) is bent toward the inner side of the sandwich under the guidance of the second bonding portion (52), the first auxiliary fold (31), and the second auxiliary fold (32) to form a side L-shaped support surface, thereby providing support strength for the side sandwich support frame.

5. The paperboard structure according to claim 4, characterized in that: L-shaped slits are provided on both sides of the outer panel surface (14), and a first L-shaped support strip (21) having only one connecting folded edge is cut out, and a fourth auxiliary fold (34) and a fifth auxiliary fold (35) are provided. The fourth auxiliary fold (34) is transversely connected to the end points of the L-shaped slits, and a third bonding portion (53) is formed between the fifth auxiliary fold (35) and the end of the first L-shaped support strip (21). After the outer panel surface (14) is turned outward along the second transverse fold (42), the third bonding portion (53) is bonded and fixed to the back of the end support surface (16), so that during extrusion molding, the first L-shaped support strip (21) can be stretched and expanded to form an L-shaped support, thereby providing support strength for the end support frame of the end surface.

6. The paperboard structure according to claim 4, characterized in that: A second vertical slit (46) is provided on both sides of the outer panel (14) and extends from the middle to the outside of the edge. A second L-shaped support strip is cut out on each side of the outer panel (14). A sixth auxiliary fold (36) and a seventh auxiliary fold (37) are provided on the second L-shaped support strip. The sixth auxiliary fold (36) is transversely connected to the end point of the second vertical slit (46). A fourth bonding portion (54) is formed between the seventh auxiliary fold (37) and the end of the second L-shaped support strip. After the outer panel (14) is turned outward along the second transverse fold (42), the fourth bonding portion (54) is bonded and fixed to the back of the end support surface (16), so that during extrusion molding, the second L-shaped support strip can be stretched and expanded to form an L-shaped support, thereby providing support strength for the end support frame of the end surface and providing a double-layer cardboard thickening support function for the vertical edge of the support frame.

7. The paperboard structure according to claim 1, characterized in that: A supporting tongue piece (24) having only one side as a connecting fold is provided at both ends of an outer plate surface (14). The supporting tongue piece (24) is cut by double right-angle slits (23) and includes an eighth auxiliary fold (38) and a ninth auxiliary fold (39). A fifth bonding portion (55) is formed between the ninth auxiliary fold (39) and the end of the supporting tongue piece (24). After folding, the fifth bonding portion (55) is bonded to the back of the end support surface (16), so that during extrusion molding, the supporting tongue piece (24) can be stretched and expanded to form an L-shaped support, thereby providing support strength for the end support frame formed by the end support surface (16).

8. A paper tray folded from the paperboard structure according to any one of claims 1 to 7, characterized in that include: The double-layer bottom panel comprises an upper bottom panel surface (11) and a lower bottom panel surface (12) bonded and fixed to the bottom surface of the upper bottom panel surface (11) through a first bonding portion (51) formed by overlapping. The outer panel surface (14) is connected to the lower bottom panel surface (12) via a third transverse fold (43), and can form a vertical plane relationship along the third transverse fold (43) after folding; A folded top surface (15) is connected to the outer panel surface (14) via a second transverse fold (42), and is connected to the inner panel surface (13) via a fourth transverse fold (44); the plane formed between the second transverse fold (42) and the fourth transverse fold (44) is the folded top surface (15); the inner panel surface (13) is formed between the fourth transverse fold (44) and the first transverse fold (41), and is connected to the upper bottom panel surface (11) via the first transverse fold (41); The end support surface (16) is semi-separated by the two ends of the inner panel surface (13) through the first vertical slit (45), and its upper and lower ends are respectively connected to the folded top surface (15) and the upper bottom panel surface (11) through the shoulder fold (30) and the third auxiliary fold (33), and the end support surface (16) and the outer panel surface (14) and the lower bottom panel surface (12) together form an end support frame structure; the heights of the end support surface (16), the inner panel surface (13) and the outer panel surface (14) are all kept equal; The lateral support plate (20) is provided on the outer panel surface (14) or on the outer panel surface (14), and there is at least one lateral support plate on each side. The transverse edge of the lateral support plate (20) is a first auxiliary fold (31) connecting the edge. Through the fixation of the second adhesive portion (52) and the guidance of the second auxiliary fold (32), the lateral support plate (20) can be L-shaped after folding. The L-shaped support surface is connected between the inner panel surface (13) and the outer panel surface (14), and its width is equal to the thickness of the interlayer between the inner panel surface (13) and the outer panel surface (14).

9. The paper tray according to claim 8, characterized in that: On both sides of the outer panel (14), there are provided a first L-shaped support strip (21) cut inwardly along the edge of the outer panel (14) based on an L-shaped slit; or a second L-shaped support strip cut based on a second vertical slit (46) penetrating to the long side of the lower bottom panel (12); The first L-shaped support strip (21) and the second L-shaped support strip are respectively provided with a fourth auxiliary fold (34) and a fifth auxiliary fold (35), and a sixth auxiliary fold (36) and a seventh auxiliary fold (37), respectively forming a third bonding portion (53) and a fourth bonding portion (54), both of which are used to bond and fix to the bottom surface of the end support surface (16) after folding, so that after the paper tray is folded and formed, an L-shaped support is formed between the end support surface (16) and the outer plate surface (14).

10. The paper tray according to claim 8, characterized in that: Support tongues (24) having only one connecting edge cut along the double right-angle slits (23) are provided on both sides of the outer panel surface (14); the width of the support tongues (24) is smaller than the width of the end support surface (16); the support tongues (24) are bonded to the bottom surface of the end support surface (16) through the eighth auxiliary fold (38) and the ninth auxiliary fold (39) in cooperation with the fifth bonding portion (55); after the paper tray is folded and formed, an L-shaped support is formed between the end support surface (16) and the outer panel surface (14).

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