CN222833290U

CN222833290U - Paperboard structure and paper support for rapid folding and forming of single-layer paperboard

Info

Publication number: CN222833290U
Application number: CN202421365721.8U
Authority: CN
Inventors: 严云珍; 郭广增
Original assignee: Yunnan Quanxin Packaging Printing Co ltd
Current assignee: Yunnan Quanxin Packaging Printing Co ltd
Priority date: 2024-06-14
Filing date: 2024-06-14
Publication date: 2025-05-06
Anticipated expiration: 2034-06-14

Abstract

The utility model discloses a paperboard structure and a paper holder for rapid folding and forming of a single-layer paperboard, wherein the paperboard is cut by a cutting die and is preset with folds and slits, the paperboard comprises a bottom plate, side plates and an inward turning surface, an embedded bonding lug is used as a first bonding part, and the structure is characterized in that the paperboard structure can be automatically formed by bidirectional opposite extrusion through a smart fold design by utilizing transverse and vertical folding lines and L-shaped supporting strips. The inner turnover surface is turned over along the preset crease and is bonded for standby, so that the transportation and storage are convenient, and during assembly, the stable strip-shaped vertical edges and the hollow support frame are formed by means of bending and fixing of the L-shaped support bars. The end protection buffer frame is convenient to quickly assemble into equal-size end protection buffer frames, is suitable for supporting and protecting commodities in the paper boxes, has the advantages of high-efficiency production and transportation convenience, small paper consumption and low cost, is high in forming efficiency and easy to operate in use, and greatly improves the labor efficiency and yield of paper support during forming.

Description

Paperboard structure and paper support for rapid folding and forming of single-layer paperboard

Technical Field

The utility model relates to the technical field of paper support liners for packaging boxes, in particular to a paper support and a paper support with a single-layer paper board fast folding and forming structure.

Background

Carton liners, especially paper tray products, play an increasingly important role in the modern packaging field, being favored for their environmental protection, recyclability and good cushioning properties:

1. The paper holder is mainly made of paper pulp, is a sustainable packaging solution, can be completely recycled and meets the growing environmental protection requirement worldwide. Compared with the traditional plastic foam material, the plastic foam material has less influence on the environment after production and waste.

2. The method has wide application range, and is suitable for various industries including but not limited to electronic products, foods (such as eggs and fruits), precise instruments, glass ceramic products, artware and the like. Is especially suitable for protecting static sensitive or fragile products.

3. The buffer performance has good buffer and damping performance, and can effectively protect products from impact and vibration damage in the transportation process.

4. The cost benefit is that with the technical progress, the production cost of the paper holder is relatively low, the production period is short, and the raw material cost is also economical.

5. The customized design can be performed according to the shapes and the protection requirements of different products, and comprises various structural elements such as waveforms, tables, semi-circles and the like so as to achieve the optimal protection effect.

However, the existing paper holder has the following defects:

1. The manual dependency is that part of paper support products still need manual folding and forming, especially in the paper support production with high customization degree and complex structure (the support and buffer structure which needs to provide buffering demands for the surrounding side walls), the automation degree is limited, and the labor cost and the production time are increased.

2. The paper tray is required to have the buffering protection capacity around or special shapes, and a plurality of paper board materials are possibly required to be bonded, folded and formed, so that the material cost is increased, the time consumption of paper tray forming is affected, the manual boxing efficiency is low, and the productivity is reduced.

3. The paper support lining has the advantages that the paper support lining has different sizes, shapes, protection and buffering grades and strength and thickness requirements for different product packaging requirements, and the paper support lining is usually required to be redesigned to be molded according to the differences, so that the paper support molding modes of different specifications and models are different, the complexity in the manual processing process is further increased, and the productivity is reduced.

In summary, although paper products have significant advantages in terms of environmental protection and cost control, there are still certain limitations on the productivity, physical properties and applicability under specific conditions, which are the directions of future technological improvements and innovations.

Disclosure of utility model

The utility model is used for solving the defects and the shortcomings of the prior art, and the inventor designs a brand new paperboard structure, can quickly and conveniently mold a paperboard lining based on one piece of integrated paperboard, can efficiently improve the molding efficiency of a paper holder, and has the excellent technical effects of stable supporting effect, less paper consumption and low cost. Specifically, the utility model is realized as follows:

A cardboard structure of quick fold formation of individual layer cardboard, cardboard structure wholly is cross central symmetry's overall arrangement, includes:

The paperboard body, the integrally formed paperboard surface, is divided into a bottom plate surface (1), two side plate surfaces (2) positioned at the upper side and the lower side of the bottom plate surface, and inner folded surfaces (3) positioned at the two ends and separated by vertical folding kerfs (12);

After the inner turnover surface (3) is turned inwards, the inner turnover surface is adhered and fixed with the bottom plate surface (1) and the side plate surface (2), an outwards extending adhesive lug is reserved on the top of the inner turnover surface (3), and the adhesive lug is a first adhesive part (21)

The L-shaped support bars (4) are respectively arranged at the end parts of the side plate surfaces (2) and the bottom plate surface (1), only one side of each L-shaped support bar is a connecting edge, each L-shaped support bar is of a tongue piece-shaped structure, each tongue piece can be bent to be of an L shape, the width of each L-shaped support bar (4) is matched with the width of each inner turning surface, and the end faces of the L-shaped support bars (4) are provided with third bonding parts (23) for bonding and fixing contact surfaces of the inner turning surfaces (3) after the inner turning and folding.

On the other hand, the utility model provides a paper holder formed by rapid folding of a single-layer paperboard, which comprises:

The bottom plate surface (1) is formed by arranging two transverse folding indentations (11) on the paperboard body and is used as the bottom surface of the paper holder;

the side plate surface (2) is formed by a transverse folding indentation (11) to the transverse edge of the paper plate on one side;

The end support frames are arranged at the two ends between the two side plate surfaces (2) and are used for supporting the paper frame with the thickness on the end surfaces, are formed by bending an inner turning surface and an L-shaped support bar (4),

The inner turnover surface is positioned at the left side and the right side of the paperboard body, can be turned inwards, is provided with two vertical kerfs which are not communicated along a turnover line, is provided with two bonding lugs at the upper end and the lower end, and is provided with a plurality of indentations, and can be unfolded and folded for forming along with inward extrusion forming of the paperboard;

The L-shaped support strips (4) are respectively provided with tongue pieces with one side being a connecting indentation at the intersection angle of the transverse folding indentation (11) and the folding line, the tongue pieces can be bent to be L-shaped, the width of the L-shaped support strips (4) is matched with the width of the inward-turning surface, and the L-shaped support strips can be unfolded and bent for forming along with inward extrusion forming of the paper board.

When the folding board is required to be used, the board structure is rapidly deformed by inwards extruding the side board surface, and the inwards-turned folded surface is guided to stand by the second crease, the third crease and the bonding part to form a strip-shaped standing edge structure. The L-shaped support bars are horizontally arranged along with the unfolding of the structure, and provide additional support force. The final formed structure is a buffer frame body with two closed ends, equal thickness, equal height and equal width, is suitable for being placed in a paper box, provides stable support and protection for articles, and has good buffer performance.

The utility model has the working principle that the paperboard structure is an integral paperboard, and is manufactured by finishing automatic kerf, indentation and cutting molding through a die cutting machine, the basic structure comprises two lateral plate surfaces and a bottom plate surface which are divided by two lateral folding indentation areas, two inner folded surfaces can be separated by taking vertical folding kerf and vertical folding indentation as folding lines, bonding lugs, a first crease, a second crease and a third crease are arranged at the upper end and the lower end of the inner folded surfaces, and the bonding lugs are matched with the bonding fixation of a first bonding part and the bonding lugs, so that the inner folded surfaces are folded at the two long edges of the paperboard before folding; when two side plate surfaces of the paperboard are pressed inwards from two ends of the paperboard to be folded inwards and raised along transverse folding indentations, in the process, the inwards folded surfaces are folded under the action of the fixing of the two bonding parts and the second crease and the third crease, and are separated from the side surfaces of the paperboard to be raised vertically, so that a strip-shaped vertical edge structure is formed, the L-shaped supporting strips are matched with the bending of the L-shaped supporting strips bonded with the two side plate surfaces, the L-shaped supporting strips are stretched and transversely arranged, so that a hollowed-out paper frame structure with supporting transverse strips is formed, the inwards folded surfaces at the two ends are oppositely vertically formed, the inwards folded surfaces at the two ends are matched with each other to form an end protection buffer frame body with equal thickness, equal height and equal width, the paper support structure is placed into the paper box, a support structure can be formed at the two ends, the functions of supporting, protection and buffering are achieved, preferably, a fifth crease, a sixth crease, a seventh crease and an eighth crease can be matched with the long edge to form a right-angle flanging structure or a square pipe structure which is outwards folded in the side direction, meanwhile, a rectangular bottom surface can be reserved through an angle edge on the bottom cutting surface, when the paper support is placed into the paper box, the right-angle flanging structure or the square tubular structure can be matched with the bottom wing surface to form a sandwich structure which is formed relative to the side plate of the carton, and the sandwich structure can also provide buffering protection and support effects, so that the formed paper holder has the functions of protecting, buffering and supporting a stable bracket all around.

The beneficial technical effects of the utility model are as follows:

1. The automatic production efficiency is high, the modern mature automatic processing production such as kerf, indentation, cutting and the like is finished by adopting automatic die cutter equipment, the processing cost is low, and the production efficiency and the consistency of finished products can be improved by matching with the equipment for automatic glue folding and forming, so that the manufacturing cost is reduced.

2. The integral paper support structure is formed by processing a piece of integral paper board, so that the assembly links are reduced, the production flow is simplified, the paper consumption is reduced, the production cost is reduced, and the processing and forming efficiency and yield are improved.

3. The flexible folding mechanism is that the unique transverse and vertical folding design (comprising indentation and kerf) allows the paper holder to be subjected to one-time bidirectional folding, so that the paper holder can be quickly and conveniently folded into a three-dimensional form, no additional fixing tool is needed, the paper holder is convenient to transport and store, the processing flow is optimized, and the cost of the assembly forming stage is reduced.

4. The protection performance is enhanced, the matching of the inner turning surface and the bonding lugs, the design of the first crease, the second crease and the third crease, the introduction and the bending design of the L-shaped supporting bar further enhance the bearing capacity of the paper support, a stable strip-shaped standing edge structure is formed, the stable form conversion of the paper support in the folding process is ensured, the protection and buffering performance of the end part of the loaded article is effectively improved, and the damage risk in the transportation process is reduced.

5. The reinforced four-side protection structure is a right-angle flanging structure or a square-tube structure formed by fifth to eighth folds, and the design of the bottom surface not only increases the lateral stability of the paper support, but also forms an additional sandwich buffer structure in the carton, thereby improving the protection force to the product in all directions.

6. The utility model can adjust the size and structure of each part according to the actual demand, is suitable for the product package of various specifications, can make the adaptive adjustment to the positions and lengths of various cutting joints and folds according to the size specifications of different products, can increase the cardboard supporting thickness of the end side and the front and back sides, the depth and thickness of the cardboard supporting groove, and the like, has the characteristic of high flexibility, and can meet the package demands of different industries and different products.

7. The paper support structure is completely recyclable due to the adoption of the paper material, accords with the current environmental protection trend, and is beneficial to the exhibition of social responsibility of enterprises and the realization of sustainable development targets.

Drawings

FIG. 1 is a schematic illustration of the crease slit position of a quick fold formed paperboard structure of a single ply paperboard of the utility model;

FIG. 2 is a perspective view of a quick fold formed paperboard structure of a single ply paperboard of the utility model;

FIG. 3 is a schematic view of a process for pre-folding and bonding a single-ply paperboard structure according to the present utility model;

FIG. 4 is a schematic illustration of the extrusion process of a single ply paperboard rapid folding paperboard structure of the utility model;

FIG. 5 is a perspective view of a quick fold formed tray of single ply paperboard according to the utility model;

FIG. 6is a schematic illustration of a quick fold formed paper tray using a single ply of paperboard of the present utility model placed into a package;

FIG. 7 is a schematic illustration of the kerf creasing locations of the quick fold formed paperboard structure of example 2;

FIG. 8 is a perspective view of the rapid folding molded paperboard structure of example 2 after it has been folded into a tray;

FIG. 9 is a schematic illustration of the kerf creasing locations of the quick fold formed paperboard structure of example 3;

FIG. 10 is a perspective view of the rapid folding molded paperboard structure of example 3 after it has been folded into a tray;

FIGS. 11-13 are schematic views showing the structural change of the single ply paperboard based quick fold forming paper tray of the present utility model, which can be adjusted according to the size of each crease, slit;

Wherein:

1. The foundation structure surface comprises a 1-bottom surface, a 2-side surface, a 3-inward turnover surface, a 4-L-shaped supporting bar, a 5-outward turnover surface, a 6-transverse thickness surface and a 7-bottom surface.

2. Key folds and slits are 11-transverse folding impression, 12-vertical folding slits, 13-vertical folding impression and 14-right angle edge slits.

3. Auxiliary folds 31-first fold, 32-second fold, 33-third fold, 34-fourth fold, 35-fifth fold, 36-sixth fold, 37-seventh fold, 38-eighth fold.

4. The bonding parts are 21-first bonding part, 22-second bonding part, 23-third bonding part and 24-fourth bonding part.

Detailed Description

The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

Embodiment 1A paperboard structure formed by rapid folding of single-layer paperboard, wherein the paperboard structure is integrally arranged in a cross center symmetry manner, and comprises:

The paperboard comprises a paperboard body and a paperboard plate surface, wherein the paperboard plate surface is integrally formed and comprises a bottom plate surface 1, two side plate surfaces 2 and four inward turning surfaces 3, and bonding lugs extending outwards are reserved on the top of the inward turning surfaces 3;

Two transverse folding indentations 11 are symmetrically arranged along the transverse central line of the paperboard body, a bottom plate surface 1 is formed between the two transverse folding indentations 11, and a side plate surface 2 is formed between the transverse folding indentations 11 and the transverse edge of one side where the transverse folding indentations are positioned;

four vertical folding slits 12 are respectively arranged at one end of a vertical folding indentation 13 which extends vertically to the middle part of the paperboard along the inner side edge of each bonding lug, and an inner turnover surface 3 is formed between the vertical folding slits 12 and the edge of the vertical edge at one side;

The inner turnover surface 3 is provided with a first crease 31, a second crease 32 and a third crease 33 in sequence from the bonding lug, and a second bonding part 22 is formed between the two third creases 33 on the same side, and the inner side edge of the first bonding part 21 is the vertical folding crease 13;

The L-shaped supporting strips 4 are respectively provided with tongue pieces with one side being a connecting indentation at the intersection angle of the transverse folding indentation 11 and the folding line, the tongue pieces can be bent to be L-shaped, the width of the L-shaped supporting strips 4 is matched with the width of the inward turning surface, and the area between the fourth indentation 34 on the L-shaped supporting strips 4 and the end of the fourth indentation forms a third bonding part 23.

The paperboard body in the embodiment is a single-layer paperboard, is cut and molded by a cutting die machine, is simultaneously provided with the folds and the indentations as required, is provided with the vertical folding kerfs 12 and the kerfs of the L-shaped supporting strips 4, and can be used, if necessary, the bonding parts can be glued by a machine or manually, the inner turnover surfaces 3 on two sides are turned over, the two long sides of the paperboard are turned over along the vertical folding indentations 13, and the bonding orientation is completed through the first bonding part 21, the second bonding part 22 and the third bonding part 23, so that the paperboard can be used for standby. When the paperboard is required to be transported to a merchant warehouse and cargoes are required to be boxed, each paperboard can be inwards extruded from two sides of the side plate, when the paperboard is extruded, the two side plate surfaces 2 are inwards folded and erected along the transverse folding indentation 11, in the process, the inwards folded surface 3 is folded under the action of the second bonding part 22 and the third bonding part 23 and the second crease 33, the inwards folded surface 3 is upright to form a strip-shaped upright edge structure, the L-shaped supporting strips 4 are matched with the bending of the L-shaped supporting strips 4 bonded with the upright edge structure, the L-shaped supporting strips 4 are stretched and transversely arranged, so that a hollowed-out paper frame structure with supporting transverse strips is formed, the inwards folded surfaces 3 at two ends are oppositely vertically formed, and are matched with each other to form an equal-thickness, equal-height and equal-width end protection buffer frame body, and the paper support structure is put into the paper box, so that a support structure can be formed at two ends, and the functions of supporting, protection and buffering are achieved;

Preferably, after the inner folded surface is folded inwards along the vertical folding kerf 12 and the vertical folding indentation 13, the first bonding part 21 of the bonding lug can be used for being adhered to the back surface of the paperboard body downwards, the second bonding part 22 can be used for being adhered to the bottom plate surface 1, the third bonding part 23 can be used for being adhered to the folded inner folded surface, after the two ends of the paperboard body are folded in half, the two ends of the paperboard body can be folded up and opposite along the transverse folding indentation 11, the inner folded surface is unfolded inwards relatively under the guidance of the first folding indentation 31 and the second folding indentation 32 by taking the second bonding part 22 as a fixed fulcrum, a first transverse supporting surface is formed between the first folding indentation 31 and the bent edge of the bonding lug, and the L-shaped supporting strip 4 is stretched to form a second transverse supporting surface, so that the whole surface supporting frame is formed. The three bonding parts enable the inner folded surface part to be fixed in area, the part of the inner folded surface part is not fixed, the folded edge formed by the second fold 32 and the third fold 33 is matched, the unfixed part is stretched to form a folded surface structure, so that the body structure of the supporting frame is unfolded, the supporting frame structure is arranged at two ends of the paper holder, and the supporting and buffering bracket structure is formed on the directions of the two end surfaces.

Preferably, the distance between the edge of the adhesive lug and the first crease 31 is equal to the distance between the root of the tongue piece of the L-shaped supporting strip 4 and the fourth crease 34. And the slits of the L-shaped support bar 4 are L-shaped, because the slits of one side coincide with the vertical folding slits 12, no further cutting is necessary. The transverse slits of the L-shaped support bar 4 are partially overlapped with the transverse folding indentations 11. The design is used for ensuring that the size and shape of the inner turnover surface are matched with the overall size and structure of the paper holder after the inner turnover surface is turned, unfolded and molded.

In embodiment 2, on the basis of embodiment 1, preferably, a section of outer folding surface 5 is reserved on the top edge of the side plate surface 2, two fifth folds 35 and sixth folds 36 which transversely penetrate through two ends are arranged on the outer folding surface 5, during folding and forming, the outer folding surface 5 is outwards folded along the fifth folds 35 and the sixth folds 36 to form an outwards turned right-angle flanging structure, a transverse thickness surface 6 is formed between the fifth folds 35 and the sixth folds 36, and the bonding lugs are bonded on the transverse thickness surface 6. The design structure aims to realize sandwich design between the two side plate surfaces 2 and thicken the supporting thickness and space of the paper holder in the side direction, correspondingly, a right-angle side cutting seam 14 is arranged in the middle section of the transverse folding indentation 11, the width of the right-angle side cutting seam 14 is correspondingly equal to that of the transverse thickness surface 6, the design is such that the right-angle side cutting seam 14 forms a bottom wing surface 7 which is flush with the bottom plate surface 1 when the paper holder is folded and formed, the width of the bottom wing surface 7 is correspondingly equal to that of the transverse thickness surface 6, therefore, the thickness provided by the right-angle flanging structure is equal to that of the bottom wing surface 7, after the paper holder is filled into a packaging box, the right-angle flanging structure and the bottom wing surface 7 can be contacted with the side wall of the packaging box and provide support for reinforcing the integral strength of the side clamping cavity, and further realize the integral paper holder protection function on the square.

Preferably, the width of the bonding lug does not exceed the width of the transverse thickness surface 6, and at this time, the first bonding part 21 is bonded on the transverse thickness surface 6, so that the strength of the transverse thickness surface 6 can be further improved;

Preferably, the fifth crease 35 is located on the same straight line with the bending edge of the adhesive ear. The size design ensures that the formed lining paper support is a rectangular space body as a whole and is easy to be put into a paper box.

In embodiment 3, on the basis of embodiment 2, the outer folding surface 5 further includes two transverse penetrating ends, namely a seventh fold 37 and an eighth fold 38, so that the outer folding surface 5 is folded outwards along the fifth fold 35, the sixth fold 36, the seventh fold 37 and the eighth fold 38 during folding and forming, a fourth bonding part 24 is formed between the eighth fold 38 and the edge, the fourth bonding part 24 is bonded on the outer surface of the side panel, and the outer folding surface 5 is folded to form an everted square tube structure. Compared to the right-angled flange structure of embodiment 2, which is optimized to be a square tubular structure, the square tubular structure provides more one supporting cross surface and is fixed by the fourth bonding portion 24, and the overall shape thereof is easy to keep fixed, providing better side supporting force and strength.

The embodiment 4 is based on the paperboard structure using the 3 embodiments, and can obtain a paper holder based on rapid folding and forming of a single-layer paperboard, the structure comprises an inner turnover surface, two vertical slits, a bottom plate surface 1, a side plate surface 2 and L-shaped support bars 4, wherein the inner turnover surface is positioned on the left side and the right side of a paperboard body, can be turned inwards, are provided with two non-communicated vertical slits along turnover lines, the upper end and the lower end of the inner turnover surface are respectively provided with two bonding lugs, a plurality of indentations are formed in the upper end and the lower end of the inner turnover surface, the bottom plate surface 1 is formed by two transverse folding indentations 11 on the paperboard body, the side plate surface 2 is formed by one transverse folding indentation 11 to the transverse side of the paperboard on one side, tongue pieces with one edge being a connecting indentation are respectively formed at the intersection angle of the transverse folding indentations 11 and the turnover line, the tongue pieces can be bent to be L-shaped, and the width of the L-shaped support bars 4 is matched with the width of the inner turnover surface.

Preferably, after the inward-turning folded surface is folded inwards along the folding line, the bonding lug can be used for being bonded to the back surface of the paperboard body downwards, the middle part of the inward-turning folded surface can be used for being bonded to the bottom plate surface 1, the front end of the tongue piece can be used for being bonded to the inward-turning folded surface after being folded, after the two ends of the paperboard body are folded in half, the inward-turning folded surface can be folded and raised oppositely along the transverse folding indentation 11, the inward-turning folded surface is unfolded inwards oppositely along the middle bonding part and under the guidance of a plurality of indentations, and the L-shaped supporting bar 4 is also stretched to form a transverse support, so that an end face supporting frame is formed.

Preferably, the folding device also comprises an outward folding strip, a square tube-shaped structure, a folding strip and a folding strip, wherein the outward folding strip is positioned at the top of the side plate surface 2 and can be folded into an outward-folded square tube-shaped structure through two fifth folds 35 and sixth folds 36 which transversely penetrate through two ends, or can be folded into an outward-folded square tube-shaped structure through four fifth folds 35, sixth folds 36, seventh folds 37 and eighth folds 38 which transversely penetrate through two ends;

The bottom surface 7 is formed by arranging a right-angle edge cutting seam 14 in the middle section of the transverse folding indentation 11, when the bottom surface 7 is folded and molded, the bottom surface 7 extends to two sides and keeps flush with the bottom surface 1, and the width of the bottom surface 7 is correspondingly equal to the width of the square pipe structure or the right-angle flanging structure.

The paper support with the structure realizes the rapid forming and high-efficiency utilization of the paperboard through ingenious folding design and bonding structure, is suitable for the fields of packaging and logistics, and can effectively improve the safety and stability of cargo transportation.

It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.

Claims

1. A cardboard structure of quick fold formation of individual layer cardboard, cardboard structure wholly is cross central symmetry's overall arrangement, its characterized in that includes:

2. The paperboard structure of claim 1 wherein said plurality of transverse creases comprises:

two transverse folding indentations (11) are symmetrically arranged along the transverse central line of the paperboard body, a bottom plate surface (1) is formed between the two transverse folding indentations (11), and a side plate surface (2) is formed between the transverse folding indentations (11) and the transverse edge of one side;

The four vertical folding kerfs (12) are respectively arranged at one end of a vertical folding indentation (13) which extends vertically to the middle part of the paperboard along the inner side edge of each bonding lug, and an inner turnover surface (3) is formed between the vertical folding kerfs (12) and the edge of the vertical edge at one side;

the inner turnover surface (3) is sequentially provided with a first crease (31), a second crease (32) and a third crease (33) from the bonding lug, a second bonding part (22) is formed between the two third creases (33) on the same side, and the inner side edge of the first bonding part (21) is the vertical folding crease (13);

The area between the fourth indentation (34) on the L-shaped supporting bar (4) and the end of the L-shaped supporting bar forms a third bonding part (23).

3. Cardboard structure according to claim 2, characterized in that, after the inward folding of the inward fold along the vertical folding slits (12) and the vertical folding indentations (13), the first adhesive part (21) of the adhesive tab is available for adhering down to the back of the cardboard body, the second adhesive part (22) is available for adhering to the bottom board surface (1), and the third adhesive part (23) is available for adhering to the folded inward fold;

after the two ends of the paperboard body are folded in half, the two ends of the paperboard body can be folded and raised oppositely along the transverse folding indentation (11), the inward folding surface takes the second bonding part (22) as a fixed fulcrum and is unfolded inwards relatively under the guidance of the first folding indentation (31) and the second folding indentation (32), a first transverse supporting surface is formed between the first folding indentation (31) and the folding edge of the bonding lug, and the L-shaped supporting strip (4) is stretched to form a second transverse supporting surface, so that a whole surface supporting frame is formed;

The distance between the edge folding of the bonding lug and the first crease (31) is equal to the distance between the root of the tongue piece of the L-shaped supporting bar (4) and the fourth crease (34).

4. Cardboard structure according to claim 2, characterized in that the transverse slits of the L-shaped support bar (4) partly coincide with the transverse fold indentations (11).

5. The paperboard structure according to claim 2, characterized in that a section of outer folding 35 surface is reserved on the top edge of the side plate surface (2), and two fifth folds (35) and sixth folds (36) which transversely penetrate through two ends are arranged on the outer folding surface (5);

During folding and forming, the outer folding surface (5) is outwards folded along the fifth crease (35) and the sixth crease (36) to form an outwards-folded right-angle flanging structure;

a transverse thickness surface (6) is formed between the fifth fold (35) and the sixth fold (36), and the adhesive lug is adhered to the transverse thickness surface (6).

6. The cardboard structure according to claim 5, characterized in that the middle section of the transverse fold impression (11) is further provided with a right-angle side slit (14), and in that the width of the right-angle side slit (14) is correspondingly equal to the width of the transverse thickness plane (6);

When the folding molding is carried out, the right-angle side cutting seam (14) forms a bottom surface (7) which is flush with the bottom plate surface (1), and the width of the bottom surface (7) is correspondingly equal to the width of the transverse thickness surface (6);

The width of the adhesive lug does not exceed the width of the transverse thickness surface (6);

the fifth crease (35) and the bending edge of the bonding lug are positioned on the same straight line.

7. The cardboard structure according to claim 5 or 6, characterized in that the outer fold (5) further comprises two transverse through-going ends, a seventh fold (37), an eighth fold (38);

During folding and forming, the outer folding surface (5) is outwards folded along a fifth crease (35), a sixth crease (36), a seventh crease (37) and an eighth crease (38), a fourth bonding part (24) is formed between the eighth crease (38) and the edge, the fourth bonding part (24) is bonded on the outer surface of the side panel, and the outer folding surface (5) is folded to form an outwards-turned square tubular structure.

8. A single ply paperboard rapid folding forming tray formed from a folded paperboard structure according to any one of claims 1-7, comprising:

9. The paper holder according to claim 8, wherein after the inner folded surface is folded inwards along the folding line, the adhesive lug can be used for being adhered to the back surface of the paperboard body downwards, the middle part of the inner folded surface can be used for being adhered to the bottom plate surface (1), and the front end of the tongue piece can be used for being adhered to the folded inner folded surface;

After the two ends of the paperboard body are folded in half, the two ends of the paperboard body can be folded and raised relatively along the transverse folding indentation (11), the inward-turning surface is unfolded relatively inwards along the middle bonding part and under the guidance of a plurality of indentations, and the L-shaped supporting bar (4) is also stretched to form a transverse support, so that an end face supporting frame is formed.

10. The paper tray according to claim 8, further comprising:

The outward turning strip is positioned at the top of the side plate surface (2) and can be turned into an outward turned right-angle flanging structure through two fifth folds (35) and sixth folds (36) which transversely penetrate through two ends, or

Can be turned over into an everted square tubular structure through four fifth folds (35), sixth folds (36), seventh folds (37) and eighth folds (38) which transversely penetrate through two ends;

The bottom surface (7) is formed by arranging a right-angle edge cutting seam (14) in the middle section of the transverse folding indentation (11), when the bottom surface (7) is folded and molded, the bottom surface (7) extends to two sides and keeps flush with the bottom surface (1), and the width of the bottom surface (7) is correspondingly equal to the width of the square pipe-shaped structure or the right-angle flanging structure.