A double-layered paperboard-based paperboard structure and paper tray

Abstract

This invention discloses a paperboard structure and paper tray based on rapid folding of double-layer paperboard, including first to third transverse folds and a first vertical slit, which together construct a basic paper tray folding frame. The end support surfaces, guided by specific folds, work in conjunction with the inner and outer side panels to form a robust end support structure. The interlayer formed between the inner and outer side panels further consolidates the overall stability. The lateral support plate is transformed into an L-shape through a clever fold design, significantly enhancing the lateral support force. The end support frame also features a similar L-shaped support strip design. This design also demonstrates various deformation schemes to adapt to different needs, such as different forms of L-shaped support strips and support tongues achieved through specific slits and auxiliary folds, which respectively improve the stability and edge strength of the ends. All components are self-formed through simple folding without additional assembly, realizing rapid three-dimensional transformation of the paperboard and greatly improving the pressure-bearing capacity and structural stability of the paper tray.

Description

Technical Field

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

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

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

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

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

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

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

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

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

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

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

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

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

[0014] 1. Double-layer bottom panel: It consists of an upper bottom panel and a lower bottom panel, which are fixed by the first adhesive part, increasing the stability and load-bearing capacity of the overall structure.

[0015] 2. Outer panel and folded top surface: The outer panel is connected to the lower bottom panel via the third transverse fold, allowing it to be folded to form a vertical surface. The folded top surface is connected to both the outer and inner panels via the second and fourth transverse folds, forming the top surface structure.

[0016] 3. Inner side panel and end support surface: The inner side panel is connected to the upper bottom panel through the first transverse fold. The end support surface is formed by the two ends of the inner side panel through the first vertical cut. It is connected to the folded top surface and the upper bottom panel through the shoulder fold and the third auxiliary fold, together forming the end support frame.

[0017] 4. Lateral support plate: Located on the outer side panel, it is fixed by the first auxiliary crease and the second adhesive part, and guided by the second auxiliary crease. After folding, it forms an L-shaped structure, which strengthens the connection between the inner and outer side panels.

[0018] 5. L-shaped support strip and support tongue: As an additional reinforcement measure, the L-shaped support strip and support tongue are fixed to the bottom surface of the end support surface through different auxiliary creases and adhesive parts to ensure that a stable L-shaped support is formed between the end support surface and the outer side panel.

[0019] The working principle of this invention: This invention utilizes a scientifically sound and ingenious die-cutting layout and crease design based on the rapid folding and forming of double-layer cardboard. It aims to achieve a highly efficient and structurally strong packaging box lining solution. The first, second, and third transverse creases, along with the first vertical slit, constitute the basic folding and forming guide frame of the cardboard structure. The first vertical slit divides the end support surface, and the fourth transverse crease defines the boundary of the folded top surface. These creases and slits collectively guide the folding and forming of the cardboard. Guided by shoulder creases and the third auxiliary crease, the end support surface, together with the inner and outer panels, forms the end support frame. The sandwich support frame formed between the inner and outer panels further enhances the structural stability. The lateral support plate, through the synergistic action of the first auxiliary crease, the second auxiliary crease, and the second adhesive portion, folds to form an L-shaped support surface, providing additional support strength to the sandwich support frame. Furthermore, it allows for multiple possible modifications. The first L-shaped support strip, through an L-shaped slit and fourth and fifth auxiliary folds, forms an unfoldable L-shaped support structure, enhancing the stability of the end support frame. The second L-shaped support strip, using a second vertical slit and sixth and seventh auxiliary folds, creates a double-layered, thickened L-shaped support, increasing the strength of the vertical edges of the support frame. The support tongue, composed of double right-angle slits, forms a simple L-shaped support through eighth and ninth auxiliary folds, providing additional support for the end pillar surfaces. This invention utilizes pre-set 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. This creates thickened support from both sides and both ends, effectively enhancing the compressive strength and overall stability of the paper tray structure.

[0020] Beneficial technical effects of the present invention:

[0021] 1. High efficiency of automated production: By using automated die-cutting equipment to complete modern and mature automated processing such as slit cutting, creasing, and cutting, the processing cost is low. When used in conjunction with automated adhesive folding and forming equipment, the production efficiency and consistency of finished products can be improved, and the manufacturing cost can be reduced.

[0022] 2. Integrated structural design: The entire paper tray structure is processed from a single piece of cardboard, reducing assembly steps, simplifying the production process, reducing paper waste, and improving processing efficiency and output.

[0023] 3. Flexible folding mechanism: The unique horizontal crease and vertical slit folding design (including several auxiliary creases) allows the paper tray to undergo a single bidirectional fold, which can be quickly and easily folded into a three-dimensional shape without the need for additional fixing tools. This facilitates transportation and storage, optimizes the assembly process, and reduces the cost of the assembly and forming stage.

[0024] 4. Enhanced Protective Performance: The double-layer side panel structure, consisting of inner and outer side panels, along with end support structures, and the addition of L-shaped support strips and lateral support plates, allows the L-shaped support strips and lateral support plates to bend and form L-shaped support panels. This further strengthens the support and protection capabilities of the paper tray's ends and sides, creating a stable structure that wraps around the center. This not only ensures the stable shape transformation of the paper tray during folding but also effectively improves the protection and cushioning performance of the ends and sides of the loaded items, reducing the risk of damage during transportation and greatly enhancing the overall strength of the paper tray.

[0025] 5. High adaptability: This invention can adjust the size and structure of each part according to actual needs, and is suitable for product packaging of various specifications. It can make adaptive adjustments to the position and length of each cut and crease according to the size and specifications of different products. It can also adjust the thickness of the cardboard support on the end side and front and back sides, the thickness of the end frame, etc., which are all highly flexible and can provide a variety of forming forms to meet the packaging needs of different industries and products.

[0026] 6. Environmentally friendly and sustainable: Because it is made of paper, the paper tray structure is fully recyclable, which is in line with current environmental trends and is conducive to demonstrating corporate social responsibility and achieving sustainable development goals. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structural composition of a paperboard structure based on rapid folding of double-layer paperboard according to the present invention;

[0028] Figure 2 This is a schematic diagram of the pre-folding and bonding process of the double-layer cardboard rapid folding forming cardboard structure of the present invention;

[0029] Figure 3 This is a schematic diagram illustrating the folding process of the double-layer cardboard rapid folding forming cardboard structure of the present invention;

[0030] Figure 4 This is a three-dimensional view of the paper tray after the double-layer cardboard rapid folding and forming cardboard structure of the present invention has been folded and formed;

[0031] Figure 5 This is a schematic diagram of the actual packaging and use of the paper tray after the double-layer cardboard quick-folding and forming cardboard structure of the present invention is formed;

[0032] Figure 6 This is a schematic diagram of the structure of the double-layer cardboard quick-folding forming cardboard structure in Example 2;

[0033] Figure 7 This is a schematic diagram of the pre-folding and bonding process of the double-layer cardboard rapid folding forming cardboard structure in Example 2;

[0034] Figure 8 This is a three-dimensional view of the paper tray after folding the double-layer cardboard quick-folding forming cardboard structure in Example 2;

[0035] Figure 9 This is a schematic diagram of the structure of the double-layer cardboard quick-folding forming cardboard structure in Example 3;

[0036] Figure 10 This is a three-dimensional view of the paper tray after folding the double-layer cardboard rapid folding forming cardboard structure in Example 3;

[0037] Figure 11 This is a schematic diagram of the structure of the double-layer cardboard rapid folding forming cardboard structure in Example 4;

[0038] Figure 12 This is a three-dimensional view of the paper tray after folding the double-layer cardboard rapid folding forming cardboard structure in Example 4;

[0039] in:

[0040] Basic structural surfaces: 11—Upper floor slab surface, 12—Lower floor slab surface, 13—Inner side slab surface, 14—Outer side slab surface, 15—Folded top surface, 16—End support surface;

[0041] Reinforced structure: 20—lateral support plate, 21—L-shaped support strip, 22—n-shaped slit, 23—double right-angle slit, 24—support tongue;

[0042] Key creases and seams: 41—First horizontal crease, 42—Second horizontal crease, 43—Third horizontal crease, 44—Fourth horizontal crease, 45—First vertical seam, 46—Second vertical seam;

[0043] Auxiliary creases and seams: 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;

[0044] The adhesive parts are: 51—first adhesive part, 52—second adhesive part, 53—third adhesive part, 54—fourth adhesive part, and 55—fifth adhesive part. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0046] Example 1: A paperboard structure based on rapid folding of double-layer paperboard, wherein the overall paperboard structure is long and symmetrical in the length direction.

[0047] The cardboard body, the cardboard board surface formed in one piece, includes an upper bottom board surface 11 located in the center, two inner side boards 13, two outer side boards 14, two folded top surfaces 15 and a lower bottom board surface 12 located at the upper and lower ends of the cardboard. The overlapping part between the back of the lower bottom board surface 12 and the upper bottom board surface 11 after it is turned outward constitutes the first adhesive part 51.

[0048] The first transverse fold 41 consists of two folds, which are set in the middle of the cardboard body and are symmetrically arranged along the transverse center line. The upper bottom plate surface 11 is formed between the two first transverse folds 41.

[0049] The second transverse fold 42 consists of two folds that run transversely across the wide surface of the cardboard body, serving as the connecting fold edge between the inner side panel 13 and the outer side panel 14.

[0050] There are four first vertical cuts 45, which overlap the two vertical sides of the two inner side panels 13 respectively. The bottom of each first vertical cut 45 extends beyond the first horizontal crease 41, but the two first vertical cuts 45 are not connected to each other, and the top of each first vertical cut 45 is not connected to the second horizontal crease 42. The bottom of the first vertical cut 45 extends horizontally to the edge of the cardboard to form an end support surface 16. The bottom edge of the end support surface 16 is a third auxiliary crease 33 connected to the first vertical cut 45, and the top edge is a shoulder crease 30. The line connecting the tops of the two first vertical cuts 45 on the same inner side panel 13 forms a fourth horizontal crease 44.

[0051] The third transverse fold 43 consists of two horizontal folds, which are set at both ends of the cardboard body. The area between the third transverse fold 43 and the edge of the end of the cardboard body serves as the lower bottom plate surface 12.

[0052] A lateral support plate 20, at least one on each side, is formed on the inner side plate 13 or the outer side plate 14. Only one horizontal edge is a first auxiliary fold 31 for connection, and the remaining edges are n-shaped cuts 22. A second auxiliary fold 32 is provided horizontally in the middle of the lateral support plate 20. The back side between the second auxiliary fold 32 and the n-shaped cut 22 serves as a second adhesive part 52.

[0053] The cardboard structure of this invention is a single piece of cardboard, automatically cut, creasing, and shaped using a die-cutting machine. It can be pre-formed by manual folding followed by automatic machine folding and gluing. The core feature is that a single piece of cardboard, after pre-folding and gluing, forms a double-layered cardboard. The cardboard body is long and symmetrically arranged, with the upper bottom panel 11 at the center and the lower bottom panels 12 at both ends. The outer panel 14 is folded outwards via the first adhesive part 51 and the second transverse fold 42, so that the lower bottom panel 12 is positioned below the upper bottom panel 11 and has half of the adhesive area of ​​the upper bottom panel 11. After folding and gluing both ends of the cardboard, the other end of the lower bottom panel 12 is also glued to the other half of the upper bottom panel 11, forming a butt joint. The entire structure forms a double-layered cardboard with overlapping bottom panels, inner side panels 13, and outer side panels 14, thus securing the double bottom panels, enhancing the strength and stability of the bottom structure, and facilitating transportation and storage.

[0054] When in use, the two inner side panels 13 of the cardboard are squeezed inward from both ends. The cardboard at both ends will stand up and fold inward along the first transverse fold 41. During this process, guided by 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 side panel 14 and stand up, thus forming a strip-shaped upright structure. Under the guidance of the second transverse fold 42 and the fourth transverse fold 44, the inner side panel 13 will also detach from the outer side panel 14 and stand up. At this time, the folded top surface 15 is also formed, thus forming a sandwich cavity relative to the outer side panel 14. This forms a thick paper frame support in four directions at both ends and sides, and a cavity area for placing items is formed in the middle. Combined with the bottom surface of the double-layer cardboard, it forms a multi-faceted protective support structure for the contents.

[0055] Preferably, the height dimensions of the outer side panel 14 and the inner side panel 13 are appropriately matched, such that after the outer side panel 14 is folded outward along the second transverse crease 42, the lower bottom panel 12 can overlap half of the transverse centerline of the upper bottom panel 11, and the distance between the third transverse crease 43 and the third auxiliary crease 33 after folding is equal to the distance between the second transverse crease 42 and the shoulder crease 30; the distance between the shoulder crease 30 and the top of the first vertical slit 45 is equal to the distance between the third auxiliary crease 33 and the bottom of the first vertical slit 45; the distance between the shoulder crease 30 and the third auxiliary crease 33 is equal to the distance between the first transverse crease 41 and the fourth transverse crease 44; the distance between the first auxiliary crease 31 and the second auxiliary crease 32 is equal to the distance between the fourth transverse crease 44 and the second transverse crease 42. The resulting paper tray is cubic in shape with a regular rectangular frame, suitable for most common packaging boxes.

[0056] In this embodiment, the lateral support plate 20 is located in the middle of the inner side plate 13. As the inner side plate 13 and the outer side plate 14 separate during the folding process, the lateral support plate 20 is pulled apart horizontally in the middle because both ends of the lateral support plate 20 are fixed respectively, thus forming an L-shaped support surface structure that supports the facade.

[0057] Specifically, after the outer panel 14 is folded outward along the second transverse crease 42, it is bonded to the first adhesive part 51 in the overlapping area of ​​the back of the upper bottom panel 11 and the back of the lower bottom panel 12. The second adhesive part 52 is bonded to the contact area between the back of the outer panel 14 and the back of the cardboard body. This allows the cardboard body to be folded in half at both ends and then folded upright along the two first transverse creases 41. The end support surface 16 unfolds inward relative to each other under the guidance of the shoulder crease 30 and the third auxiliary crease 33, forming the end support frame of both ends. The inner panel 13 and the outer panel 14 unfold together along the first transverse crease 41, the second transverse crease 42, and the fourth transverse crease 44 to form a side interlayer support frame. The side support plate 20 is bent inward towards the interlayer under the guidance of the second adhesive part 52, the first auxiliary crease 31, and the second auxiliary crease 32 to form a side L-shaped support surface, providing support strength for the side interlayer support frame.

[0058] This structural design enhances the overall support strength of the end and side frames: For the side frames, lateral support plates 20 can be installed on either the inner side panel 13 or the outer side panel 14. Through the synergistic effect of the first auxiliary fold 31, the second auxiliary fold 32, and the second adhesive part 52, an L-shaped support surface is formed, providing 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 on both sides of the outer side panel 14 through the design of cuts and folds. Combined with the fixing and limiting of the adhesive part and the stretching and shaping 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 out and shaped during the folding process of the cardboard without any other additional operations. While ensuring assembly efficiency, it also ensures the support and protection strength of the paper tray, and can quickly form a paper tray structure with four-way support and protection.

[0059] Example 2: The outer side panel 14 has L-shaped slits on both sides to cut out a first L-shaped support strip 21 with only one connecting fold. A fourth auxiliary fold 34 and a fifth auxiliary fold 35 are provided. The fourth auxiliary fold 34 is laterally connected to the end of the L-shaped slit. The fifth auxiliary fold 35 and the end of the first L-shaped support strip 21 form a third adhesive part 53. After the outer side panel 14 is turned outward along the second transverse fold 42, the third adhesive part 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 unfolded to form an L-shaped support, providing support strength for the end support frame of the end face.

[0060] In this embodiment, specific structural elements are introduced on the outer panel 14 of the packaging box to enhance the support strength at its ends, ensuring structural stability under external pressure. L-shaped slits are designed on both sides of the outer panel 14. These slits not only define the position and shape of the first L-shaped support strip 21 but also retain a connecting fold to ensure the connectivity between the support strip and the main structure. This design allows the support strip to be easily unfolded when needed while maintaining its connection to the main panel, preventing accidental detachment during use. To further optimize the unfolding and positioning of the support strip, a fourth auxiliary fold 34 is provided laterally at the end of the L-shaped slit. This fold guides the support strip to unfold in the correct direction. Simultaneously, a fifth auxiliary fold 35 extends from the end of the support strip to its intended unfolded position, defining the bonding position of the third adhesive portion 53 together with the fourth auxiliary fold 34. This bonding process not only establishes a physical connection, but more importantly, it ensures that the first L-shaped support strip 21 can be stretched and unfolded with the movement of the outer panel 14 during the extrusion molding of the packaging box, ultimately forming a stable L-shaped support structure. The first L-shaped support strip 21 can quickly unfold and lock into place when the packaging box is compressed, forming an L-shaped support, which significantly enhances the structural strength of the end support frame.

[0061] Example 3: A second vertical slit 46 is provided on both sides of the outer side panel 14, starting from the middle and extending to the edge. A second L-shaped support strip is cut on each side of the outer side panel 14. The second L-shaped support strip has a sixth auxiliary fold 36 and a seventh auxiliary fold 37. The sixth auxiliary fold 36 is horizontally connected to the end of the second vertical slit 46. The seventh auxiliary fold 37 and the end of the second L-shaped support strip form a fourth adhesive part 54. After the outer side panel 14 is turned outward along the second horizontal fold 42, the fourth adhesive part 54 is bonded and fixed to the back of the end support surface 16. This allows the second L-shaped support strip to be stretched and unfolded to form an L-shaped support during extrusion molding, providing support strength for the end support frame of the end face and providing double-layer cardboard thickening support for the vertical edge of the support frame.

[0062] In this embodiment, an L-shaped support strip with an alternative design is provided, namely the second L-shaped support strip. In this embodiment, the two sides of the outer panel 14 are carefully arranged, each with a second vertical slit 46 extending from the center of the panel to the edge. This design is not only ingenious but also practical, effectively dividing the outer panel 14 into two second L-shaped support strips. This structural change provides a basis for subsequent folding and reinforcement. To ensure that the second L-shaped support strip can unfold correctly and firmly during final forming, two auxiliary folds are incorporated into the design: a sixth auxiliary fold 36 and a seventh auxiliary fold 37. The sixth auxiliary fold 36 extends laterally through the two ends of the second vertical slit 46, which helps 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, it defines an area called the fourth adhesive portion 54. When the outer panel 14 is folded outward along the second transverse crease 42 according to the design, the fourth adhesive part 54 is precisely aligned and bonded to the inside of the back of the end support surface 16. This arrangement ensures that the second L-shaped support strip can be smoothly stretched and unfolded during the actual extrusion molding process, ultimately forming a stable L-shaped structure, providing significantly enhanced support strength for the end support frame. Furthermore, the structural design in this embodiment also strengthens the end support surface 16. Due to the use of the second vertical slit 46, the fourth adhesive part 54 of the second L-shaped support strip is longer and adhered to the end support surface 16, forming a thickened double-layer cardboard adhesive structure at the bottom of the end support surface 16, thereby further improving the vertical and lateral support strength of the end support surface 16.

[0063] Example 4: At both ends of an outer panel 14, a support tongue 24 is provided, with only one side having a connecting crease. The support tongue 24 is cut by double right-angle slits 23, including an eighth auxiliary crease 38 and a ninth auxiliary crease 39. The ninth auxiliary crease 39 and the end of the support tongue 24 form a fifth adhesive part 55. After folding, the fifth adhesive part 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 unfolded 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, and the n-shaped slit 22 are groove structures with a diameter of not less than 1 mm, and the bent part of the n-shaped slit 22 is rounded; the two ends of the groove structure are arc ends.

[0064] In this embodiment, an L-shaped support strip with an alternative design, namely the support tongue 24, is provided. This structure is a local optimization at both 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 at the end, i.e., the width of the end support surface 16, which is usually greater than 7cm, if the support strip is cut from the outer panel 14 as in embodiments 2 and 3, the overall area of ​​the outer panel 14 will be reduced, weakening the lateral support strength. Therefore, a special support structure—the support tongue 24—is designed and implemented at each end of the outer panel 14. These support tongues 24 are cut by precise double right-angle slits 23, with each slit retaining a connecting crease on only one side. This design ensures a firm connection between the support tongue 24 and the outer panel 14, while also facilitating free folding and unfolding when necessary. The supporting tongue 24 is cleverly equipped with an eighth auxiliary fold 38 and a ninth auxiliary fold 39. The eighth auxiliary fold 38 is arranged laterally along one side of the cut, ensuring the folding direction and accuracy of the supporting tongue 24. The ninth auxiliary fold 39 extends to the vicinity of the end of the supporting tongue 24, defining the fifth adhesive part 55 together with the eighth auxiliary fold 38. During the assembly or molding of the packaging box, the outer panel 14 is folded according to the pre-designed folds, and the fifth adhesive part 55 is precisely aligned and bonded to the back of the end support surface 16. This bonding step is not only simple and efficient, but also ensures that the supporting tongue 24 can smoothly and stably unfold into an L-shaped structure when subjected to compression or bearing weight, thereby providing strong support for the end support frame constructed by the end support surface 16. Through this structural design, the load-bearing capacity of the end is significantly improved, and pressure is effectively distributed, reducing the risk of deformation or damage caused by external forces, making it particularly suitable for packaging needs of heavy or fragile items. Example 4, through its innovative support tongue 24 design, not only optimizes the stability and durability of the packaging structure, but also demonstrates how to maximize functionality and efficiency through meticulous structural design under limited material and space conditions, providing an efficient and practical solution for the packaging industry.

[0065] Example 5: A paper tray for rapid folding of double-layer cardboard, comprising:

[0066] The double-layer bottom panel includes an upper bottom panel 11 and a lower bottom panel 12, which is bonded and fixed to the bottom surface of the upper bottom panel 11 through a first adhesive part 51 formed by overlapping.

[0067] The outer panel 14 is connected to the lower bottom panel 12 through a third transverse fold 43, and after folding, it can form a vertical plane relationship along the third transverse fold 43.

[0068] The folded top surface 15 is connected to the outer side panel 14 through a second transverse crease 42 and to the inner side panel 13 through a fourth transverse crease 44. The plane formed between the second transverse crease 42 and the fourth transverse crease 44 is the folded top surface 15.

[0069] The inner side panel 13 is formed by 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.

[0070] The end support surface 16 is semi-separated from the inner side plate 13 at both ends by the first vertical cut 45. Its upper and lower ends are connected to the folded top surface 15 and the upper bottom plate 11 by the shoulder fold 30 and the third auxiliary fold 33, respectively. The end support surface 16, the outer side plate 14 and the lower bottom plate 12 together form an end support frame structure. The heights of the end support surface 16, the inner side plate 13 and the outer side plate 14 are all equal.

[0071] A lateral support plate 20 is formed on the outer side panel 14, with at least one on each side. The lateral edge of the lateral support plate 20 is a first auxiliary crease 31 connecting the edges. Through the fixation of the second adhesive part 52 and the guidance of the second auxiliary crease 32, it can be folded into an L-shape. The L-shaped support surface connects the inner side panel 13 and the outer side panel 14, and its width is equal to the thickness of the interlayer between the inner side panel 13 and the outer side panel 14.

[0072] Preferably, on both sides of the outer side panel 14, there are first L-shaped support strips 21 cut inward along the edge of the outer side panel 14 based on L-shaped cuts; or second L-shaped support strips 21 cut based on the second vertical cut 46 extending through to the long side of the lower bottom panel 12.

[0073] 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, which respectively form a third adhesive part 53 and a fourth adhesive part 54. They 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.

[0074] Preferably, on both sides of the outer panel 14, there are support tongues 24 with only one connecting edge cut along the double right angle slits 23. 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, and after the fifth adhesive part 55 is bonded to the support tongue 24, an L-shaped support is formed between the end support surface 16 and the outer panel 14 after the paper tray is folded and formed.

[0075] When actually using the paper tray in this embodiment:

[0076] In the product packaging process, the paper tray folding and forming method of this embodiment can achieve rapid and efficient packing into the packaging box and provide comprehensive protection for the product.

[0077] 1. Initial Preparation: Ensure all creases on the paper tray, such as the first to fourth horizontal creases 44, shoulder crease 30, third auxiliary crease 33, etc., and the seams, are pre-pressed or cut to facilitate smooth folding. Based on different size requirements, ensure the correct paper tray board structure is selected for the specific structure.

[0078] 2. Folding and Forming: Extruding the Inner Side Panels 13: First, gently extrude the two inner side panels 13 from both ends of the paper tray. As pressure is applied, the first transverse crease 41 guides the inner side panels 13 to stand up inwards. Simultaneously, the end support panels 16, influenced by the shoulder crease 30, the second transverse crease 42, and the third auxiliary crease 33, automatically detach from the outer side panel 14 and stand up, forming the support structure at both ends. As the inner side panels 13 stand up along the second transverse crease 42 and the fourth transverse crease 44, the folded top surface 15 is also formed, creating an open cavity in the middle for placing the product, while the double-layer bottom panel provides support at the bottom. During this extrusion folding process, the lateral support plate 20, utilizing the creases and adhesive portions on the outer side panel 14, folds into an L-shaped structure, connecting the inner side panels 13 and the outer side panel 14, further enhancing the lateral support strength. Meanwhile, the two ends of the paper tray, through the end support surface 16 and the specific crease design, can also unfold to form a stable L-shaped support frame during the folding process, increasing the load-bearing capacity of the ends.

[0079] 3. Completion and Use: The paper tray automatically forms a comprehensive support structure around the edges and bottom, with a cavity in the middle for placing the product. The paper tray can then be quickly packed into a packaging box. The entire process is designed to be both simple and efficient, ensuring both fast packaging and product safety, making it suitable for large-scale production operations.

[0080] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A cardboard structure based on rapid folding of double-layer cardboard, wherein the cardboard structure is generally elongated and symmetrically arranged along its length, characterized in that... include: The cardboard body is an integrally formed cardboard board surface, including an upper bottom board surface (11) located in the center, two inner side boards (13), two outer side boards (14), two folded top surfaces (15), and a lower bottom board surface (12) located at the upper and lower ends of the cardboard. The overlapping part between the back of the lower bottom board surface (12) and the upper bottom board surface (11) constitutes the first adhesive part (51). The first transverse crease (41) consists of two lines, which are set in the middle of the cardboard body and are symmetrically arranged along the transverse center line. The upper bottom plate surface (11) is formed between the two first transverse creases (41). The second transverse fold (42) consists of two horizontal folds that run horizontally through the wide side of the cardboard body, serving as the connecting fold edge between the inner side panel (13) and the outer side panel (14). There are four first vertical cuts (45), which overlap the two vertical sides of the two inner side panels (13). The bottom of each first vertical cut (45) extends beyond the first horizontal crease (41), but the two first vertical cuts (45) are not connected to each other, and the top of each first vertical cut (45) is not connected to the second horizontal crease (42). The bottom of the first vertical cut (45) extends horizontally to the edge of the cardboard to form an end support surface (16). The bottom edge of the end support surface (16) is a third auxiliary crease (33) connected to the first vertical cut (45), and the top edge of the end support surface (16) is a shoulder crease (30). The line connecting the tops of the two first vertical cuts (45) on the same inner side panel (13) forms a fourth horizontal crease (44). The third transverse fold (43) consists of two horizontal folds, which are set at both ends of the cardboard body. The area between the third transverse fold (43) and the edge of the cardboard body ends serves as the bottom plate surface (12). A lateral support plate (20), at least one on each side, is formed on the inner side plate (13) or the outer side plate (14), with only one horizontal edge as the first auxiliary fold (31) for connection, and the remaining edges as n-shaped cuts (22). A second auxiliary fold (32) is provided horizontally in the middle of the lateral support plate (20), and the back side between the second auxiliary fold (32) and the n-shaped cut (22) serves as the second adhesive part (52). The height dimensions of the outer side plate (14) and the inner side plate (13) are matched and correspond, so that after the outer side plate (14) is folded outward along the second horizontal fold (42), the lower bottom plate (12) can overlap half of the horizontal center line of the upper bottom plate (11), and the distance between the third horizontal fold (43) and the third auxiliary fold (33) after folding is equal to the distance between the second horizontal fold (42) and the shoulder fold (30). The distance between the shoulder crease (30) and the top of the first vertical slit (45) is equal to the distance between the third auxiliary crease (33) and the bottom of the first vertical slit (45); The distance between the shoulder crease (30) and the third auxiliary crease (33) is equal to the distance between the first transverse crease (41) and the fourth transverse crease (44); the distance between the first auxiliary crease (31) and the second auxiliary crease (32) is equal to the distance between the fourth transverse crease (44) and the second transverse crease (42).

2. The cardboard structure according to claim 1, characterized in that, After the outer panel (14) is folded outward along the second transverse crease (42), it is bonded to the first adhesive part (51) in the overlapping area of ​​the back of the upper bottom panel (11) and the back of the lower bottom panel (12). The second adhesive part (52) is bonded to the contact area between the back of the outer panel (14), so that after the two ends of the cardboard body are folded, they can be folded upright and facing each other along the two first transverse creases (41). The end support surface (16) is guided by the shoulder crease (30) and the third auxiliary crease (33). The inner side plate (13) and the outer side plate (14) unfold inward to form an end support frame on both ends. After unfolding along the first transverse crease (41), the second transverse crease (42), and the fourth transverse crease (44), a side sandwich support frame is formed. The side support plate (20) is bent towards the inside of the sandwich under the guidance of the second adhesive part (52), the first auxiliary crease (31), and the second auxiliary crease (32) to form a side L-shaped support surface, which provides support strength for the side sandwich support frame.

3. The cardboard structure according to claim 2, characterized in that, The outer side panel (14) has L-shaped slits on both sides, cutting out a first L-shaped support strip (21) with only one connecting fold, and a fourth auxiliary fold (34) and a fifth auxiliary fold (35) are provided. The fourth auxiliary fold (34) connects the end of the L-shaped slit laterally, and the fifth auxiliary fold (35) forms a third adhesive part (53) between the end of the first L-shaped support strip (21). After the outer side panel (14) is turned outward along the second transverse fold (42), the third adhesive part (53) is bonded and fixed to the back of the end support surface (16), so that when extruded, the first L-shaped support strip (21) can be stretched and unfolded to form an L-shaped support, providing support strength for the end support frame of the end face.

4. The cardboard structure according to claim 2, characterized in that, The outer side panel (14) has a second vertical slit (46) on both sides that extends from the center to the edge. A second L-shaped support strip is cut out on each side of the outer side panel (14). The second L-shaped support strip has a sixth auxiliary fold (36) and a seventh auxiliary fold (37). The sixth auxiliary fold (36) is horizontally connected to the end of the second vertical slit (46). The seventh auxiliary fold (37) and the end of the second L-shaped support strip form a fourth adhesive part (54). After the outer side panel (14) is turned outward along the second horizontal fold (42), the fourth adhesive part (54) is bonded and fixed to the back of the end support surface (16). This allows the second L-shaped support strip to be stretched and unfolded to form an L-shaped support during extrusion molding, providing support strength for the end support frame of the end face and providing double-layer cardboard thickening support for the vertical side of the support frame.

5. The cardboard structure according to claim 1, characterized in that, At both ends of an outer panel (14), there is a support tongue (24) with a connecting crease on only one side. The support tongue (24) is cut by double right-angle slits (23) and includes an eighth auxiliary crease (38) and a ninth auxiliary crease (39). The ninth auxiliary crease (39) and the end of the support tongue (24) form a fifth adhesive part (55). After folding, the fifth adhesive part (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 unfolded to form an L-shaped support, providing support strength for the end support frame formed by the end support surface (16).

6. The cardboard structure according to any one of claims 1-5, characterized in that, The first vertical slit (45) or the second vertical slit (46), and the n-shaped slit (22) are groove structures with a diameter of not less than 1 mm. The bent part of the n-shaped slit (22) is rounded. The two ends of the groove structure are rounded ends.

7. A paper tray based on the double-layer cardboard rapid folding and forming cardboard structure as described in any one of claims 1-6, characterized in that... include: The double-layer bottom panel includes an upper bottom panel (11) and a lower bottom panel (12) which is bonded and fixed to the bottom surface of the upper bottom panel (11) by a first adhesive part (51) formed by overlapping. The outer side panel (14) is connected to the lower bottom panel (12) through a third transverse fold (43), and after folding, it can form a vertical plane relationship along the third transverse fold (43); The folded top surface (15) is connected to the outer side panel (14) through a second transverse crease (42) and to the inner side panel (13) through a fourth transverse crease (44). The plane formed between the second transverse crease (42) and the fourth transverse crease (44) is the folded top surface (15). The inner side panel (13) is formed between the fourth transverse crease (44) and the first transverse crease (41), and is connected to the upper bottom panel (11) through the first transverse crease (41). The end support surface (16) is partially separated from the inner side plate (13) by the first vertical cut (45) at both ends. Its upper and lower ends are connected to the folded top surface (15) and the upper bottom plate surface (11) by the shoulder crease (30) and the third auxiliary crease (33) respectively. The end support surface (16), the outer side plate (14) and the lower bottom plate surface (12) together form an end support frame structure. The heights of the end support surface (16), the inner side plate (13) and the outer side plate (14) are all equal. A lateral support plate (20) is formed on the outer side panel (14) or the outer side panel (14), with at least one on each side. The lateral edge of the lateral support plate (20) is the first auxiliary crease (31) of the connecting edge. Through the fixation of the second adhesive part (52) and the guidance of the second auxiliary crease (32), it can be folded into an L shape. The L-shaped support surface connects the inner side panel (13) and the outer side panel (14), and its width is equal to the thickness of the interlayer between the inner side panel (13) and the outer side panel (14).

8. The paper tray according to claim 7, characterized in that, On both sides of the outer side panel (14), there are first L-shaped support strips (21) cut inward along the edge of the outer side panel (14) based on L-shaped cuts; or second L-shaped support strips (21) cut through the long side of the lower bottom panel (12) based on the second vertical cut (46). On the first L-shaped support strip (21) and the second L-shaped support strip (21), there are respectively a fourth auxiliary crease (34) and a fifth auxiliary crease (35), and a sixth auxiliary crease (36) and a seventh auxiliary crease (37), which respectively form a third adhesive part (53) and a fourth adhesive part (54), 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 side plate surface (14).

9. The paper tray according to claim 7, characterized in that, On both sides of the outer panel (14), there are support tongues (24) with only one connecting edge cut along the double right angle slits (23). 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) by the eighth auxiliary fold (38) and the ninth auxiliary fold (39) and the fifth adhesive part (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 (14).

Images