WO2014176798A1

WO2014176798A1 - High-strength composite board without stress weak line, and folder

Info

Publication number: WO2014176798A1
Application number: PCT/CN2013/076031
Authority: WO
Inventors: 张瑞洋
Original assignee: Zhang Ruiyang
Priority date: 2013-04-28
Filing date: 2013-05-22
Publication date: 2014-11-06
Also published as: WO2014176801A1; CN103407211B; WO2014176799A1; CN103407211A; WO2014176800A1

Abstract

Disclosed is a high-strength composite board without stress weak lines, comprising a first plastic sheet, a plurality of disconnected hollow supports having respectively independent thin walls, and a second plastic sheet; an interlayer is formed between the first plastic sheet and the second plastic sheet; each hollow support is integrally formed in the interlayer between the first plastic sheet and the second plastic sheet via a vacuum molding process; the upper and lower ends of each hollow support are respectively connected to the corresponding first plastic sheet and second plastic sheet; and the hollow supports comprise strip supports having a length greater than the width, and being arranged in a crisscross manner. With the acting force weak areas and weak lines being eliminated, and the bending deflection and bending modulus being improved, the composite board will not be easily broken or bent, and has good stamping and molding performance.

Description

Stress-free weak line high-strength composite board and folder

The present invention relates to the field of composite sheet metal, and more particularly to a stress-free line of high-strength composite board and a folder using the same as a board.

Background technique

The composite sheet can be used in various technical fields and has a wide range of uses. For example, an aluminum-plastic composite panel is a decorative panel composed of two upper and lower aluminum layers and a plastic layer in the middle, wherein the plastic layer is composed of a solid structural plastic, and the aluminum-plastic composite panel has a quality. Lightweight, rigid, easy to process, strong weather resistance, good decorative effect, etc. Aluminum-plastic composite panels are used in indoor and outdoor decoration, especially in curtain walls. Although the aluminum-plastic composite board has the above advantages, the aluminum-plastic composite board can only be applied in a few technical fields, especially with the development of technology and the control of product cost, the market puts higher requirements on the aluminum-plastic composite board. Because the aluminum-plastic composite panel is a dense structure, the density of the aluminum-plastic composite panel is still too large, the quality of the aluminum-plastic composite panel is too large, and the material cost and production cost of the aluminum-plastic composite panel are also large, in addition, aluminum plastic The structural strength of the composite panel is not high, and the application field of the aluminum-plastic composite panel is greatly limited.

However, the same problems cannot be solved by the above-mentioned plates, because the arrangement structure of the intermediate support body is unreasonable, and the weak force zone or the directional weak force line of the plate exists, that is, a weakly stressed position exists in a certain area of the plate. Or there is a linear area with poor force in a certain direction. The plate is not balanced with the dispersion of internal stress and external force. The bending deflection and bending modulus of the plate are small, as shown in Figure 1. Round is the support in the plate Weak lines or weak areas, bent along any one of the dotted lines, are very easy to be bent or broken. These areas of the board are easily damaged by external forces, causing the entire board to be damaged and unusable.

Furthermore, in the composite panel of the prior art, the support members in the middle are mostly continuous, the support bodies are connected to each other, and the sheet material cannot be molded, so it is necessary to improve. Summary of the invention

In view of the deficiencies of the prior art, the object of the present invention is to provide a stress-free weak line high-strength composite board, which has a simple structure, low density, light weight, and eliminates weak force regions and directional weak forces on the board surface. phenomenon.

In view of the deficiencies of the prior art, another object of the present invention is to provide a file folder which is simple in structure, small in density, light in weight, and eliminates the weak force region and the directional weakness of the board surface.

In order to achieve the above object, the technical solution adopted by the present invention is:

An unstressed weak line high-strength composite board comprising a first plastic plate, a plurality of hollow support bodies having respective independent thin walls formed by a plastic forming process, and a second plastic plate, a first plastic plate and A sandwich space is formed between the second plastic plates, and each hollow support body is integrally formed in a sandwich space between the first plastic plate and the second plastic plate by a plastic forming process, and upper and lower ends of each hollow support body are respectively connected to corresponding ones. The first plastic plate and the second plastic plate, the hollow support body comprises a strip-shaped support body, the length of the strip-shaped support body is greater than the width, and the strip-shaped support bodies are arranged in a crisscross manner.

In a further embodiment, the shape of the transverse cross section of the strip-shaped support body is approximately rectangular, wherein the portion is a straight wall surface and the ends are curved surfaces. In a further embodiment, the two ends of the strip-shaped support are respectively aligned with a central position of the adjacent strip-shaped support bodies on both sides or a position offset from the middle.

In a still further embodiment, the hollow support body comprises a circular support body or a conical support body, the circular support body has a circular cross section or is close to a circular shape, and the circular support body or the conical support body is arranged in In the gap of each strip support.

In a further embodiment, the adjacent four strip-shaped supports enclose a filling section, and a center of each filling section is provided with a circular support or a tapered support.

In a further embodiment, the maximum outer diameter of the circular support body is 1/3 to 1/5 of the length of the strip-shaped support body, between the outer wall of the circular support body and the outer wall of the adjacent strip-shaped support body. Leave a gap.

In a further embodiment, the side surface of the hollow support body has a draft angle, and the side surface of the hollow support body is inclined, and the outer shape of one end surface of the hollow support body is larger than the outer size of the other end surface.

In a preferred embodiment, the stress-free weak line high-strength composite board further includes a third plastic plate, the third plastic plate is disposed in parallel with the first plastic plate, and a sandwich is formed between the third plastic plate and the first plastic plate. a space, a sandwich space of the third plastic plate and the first plastic plate is provided with a plurality of hollow support bodies having independent thin walls, and the hollow support bodies are integrally formed on the first plastic plate and the first by a plastic forming process. The interlayer space between the two plastic plates, the upper end and the lower end of each hollow support body are respectively connected to the first plastic plate and the second plastic plate.

In a further embodiment, the hollow support bodies distributed on both sides of the first plastic plate are symmetrically arranged one by one with the first plastic plate as a plane of symmetry. In a further embodiment, the second plastic plate and the third plastic plate are disposed in parallel, and the outer surfaces of the second plastic plate and the third plastic plate are respectively combined with a metal plate or a plastic protective layer.

In a further embodiment, the outer surfaces of the first plastic sheet and the second plastic sheet are respectively laminated with a metal sheet or a plastic protective layer.

A folder comprising a sheet material, wherein one or more creases are formed in the middle of the sheet, the sheet is divided into two foldable panels by a fold, and the sheet is selected from the stress-free line of the present invention.

In a further embodiment, the middle portion of the sheet material is divided into two creases, and the sheet material is divided into two panels by two creases and a ridge plate between the two panels, and the inner surface of the ridge plate is fixed with a clip body.

After adopting the above structure, the present invention has an advantage over the prior art in that: the present invention provides a hollow hollow support body which is arranged in a crisscross pattern between the first plastic plate and the second plastic plate, and the special arrangement is It can increase the structural strength, the density of the plate is small, the weight is light, the balance is stressed, the stress can be eliminated, and the uneven force of the area can be eliminated. The plate surface of the composite plate will not be stressed regardless of the direction from which the force is applied. In the weak weak zone, there will be no directional weak force lines. The forces in all directions are balanced, eliminating the weak points of the force, improving the bending resistance and bending modulus, and the composite plate is not easily broken or Bending, and the composite panel has very good molding properties.

The composite board of the invention is used as a folder of the board, and has a simple structure, a small density, and a light weight, and eliminates the weak force of the weak surface area and the directionality of the board surface.

DRAWINGS The invention will now be further described with reference to the drawings and embodiments.

1 is a schematic structural view of a prior art composite sheet having a weak force zone and a weak force line. 2 is a schematic structural view of a composite panel according to Embodiment 1 of the present invention.

Figure 3 is a cross-sectional view of a composite panel in accordance with a first embodiment of the present invention.

4 is a schematic view showing the arrangement structure of a hollow support body according to Embodiment 1 of the present invention.

Fig. 5 is a schematic structural view of a composite board according to a second embodiment of the present invention.

Fig. 6 is a schematic view showing the arrangement of a hollow support body according to a second embodiment of the present invention.

Figure 7 is a schematic view showing the structure of a composite panel according to a third embodiment of the present invention.

Figure 8 is a cross-sectional view showing a composite panel according to a third embodiment of the present invention.

Fig. 9 is a schematic structural view of a composite panel according to a fourth embodiment of the present invention.

Figure 10 is a cross-sectional view showing a composite panel according to a fourth embodiment of the present invention.

Figure 11 is a schematic view showing the structure of a composite panel according to a fifth embodiment of the present invention.

Figure 12 is a cross-sectional view showing a composite panel according to a fifth embodiment of the present invention.

Figure 13 is a schematic view showing the arrangement of a hollow support body according to a fifth embodiment of the present invention.

Figure 14 is a schematic view showing the structure of a composite panel according to a sixth embodiment of the present invention.

Figure 15 is a schematic view showing the arrangement of a hollow support body according to a sixth embodiment of the present invention.

Figure 16 is a schematic view showing the structure of a composite panel according to a seventh embodiment of the present invention.

Figure 17 is a cross-sectional view showing a composite panel of a seventh embodiment of the present invention.

Figure 18 is a schematic view showing the structure of a composite panel according to Embodiment 8 of the present invention.

Figure 19 is a cross-sectional view showing a composite panel according to an eighth embodiment of the present invention.

Figure 20 is a block diagram showing the structure of a folder in the ninth embodiment of the present invention.

In the figure: 1. First plastic plate 2, hollow support body 3, second plastic plate 4, third plastic Sheet 5, panel 6, ridges.

detailed description

The following description is only a preferred embodiment of the invention and is not intended to limit the scope of the invention.

Embodiment 1

A stress-free weak line high-strength composite board, as shown in FIG. 2-4, includes a first plastic plate 1, a plurality of hollow support bodies 2, and a second plastic plate 3, each hollow support body 2 being formed by a plastic forming process. Each hollow support body 2 is not connected to each other, and each hollow support body 2 has a separate thin wall body, and a sandwich space is formed between the first plastic plate 1 and the second plastic plate 3, and each hollow support body 2 is integrated by a plastic forming process. Forming a sandwich space between the first plastic plate 1 and the second plastic plate 3, the upper and lower ends of each hollow support body 2 are respectively coupled to the corresponding first plastic plate 1 and the second plastic plate 3, and the hollow support body 2 includes The strip-shaped support body has a length of the strip-shaped support body larger than the width, and the strip-shaped support bodies are arranged in a crisscross manner.

The shape of the transverse section of the strip-shaped support is approximately rectangular, with the portion being a straight wall and the ends being curved. The two ends of the strip-shaped support are respectively aligned with the central position of the adjacent strip-shaped support bodies on either side or from the central portion.

In a preferred embodiment, the outer surfaces of the first plastic plate 1 and the second plastic plate 3 of the composite panel may also be respectively combined with a metal plate or the outer portions of the first plastic plate 1 and the second plastic plate 3 of the composite plate. The surface can also be combined with a plastic protective layer. (The metal plate or plastic protective layer is not shown in the figure).

The hollow support bodies 2 are not connected to each other, and a gap is left between the adjacent hollow support bodies 2. Each of the hollow supports 2 is evenly spaced. Bottom side of two adjacent hollow support bodies 2 The spacing between the edges is l-10 mm. The angle between the bottom surface and the side surface of the hollow support body 2 is 40-65 degrees, and the hollow support body 2 within this range provides a better balance of mechanical properties and density of the sheet material. The denser the distribution of each hollow support 2, the better the density of the sheet material and the lighter weight, but the structural strength is higher.

The composite sheet material of the present invention is a three-dimensional spatial structure, and the hollow support body 2 forms a triangular mechanical relationship with the first plastic sheet 1 and the second plastic sheet 3, and the adjacent hollow support body 2 forms a triangular mechanical relationship. The hollow support body 2 and the first plastic plate 1 and the second plastic plate 3 form a continuous distributed complex spatial triangular mechanical relationship, and the intermediate structural layer formed by the hollow support body 2 disperses the external force and disperses the internal stress. More uniform, better dispersion of force, more balanced force, higher structural strength of the sheet, stronger load carrying capacity, better balance of lateral forces, better bending resistance Ability, higher flexural deflection and higher strength, lighter weight, lower density, and lower cost of sheet metal.

For the hollow support body 2 made of plastic material, the hollow support body 2 can be formed by suction molding, since the respective hollow support bodies 2 existing in the interlayer space are independent, and the independent hollow support body 2 is in the case of blistering It has better bending performance and tensile properties, and is more conducive to the process of plastic forming. The equipment required for production is simpler, and the equipment cost and production cost are reduced. In the case of plastic forming, the individual hollow supports 2 do not interact with each other, and therefore, it is easy to produce a sheet having a three-dimensional spatial structure by means of plastic forming, and the sheet is easily formed into other shapes, for example, sheet forming. It is a curved plate or a plate formed into various three-dimensional curved surfaces, and the shape of the plate is not limited to a flat plate.

In the process of heating the sheet into other shapes, only the first plastic sheet 1 and The second plastic sheet 3 is heated, and only the outer layer panel is heated to soften the first plastic sheet 1 and the second plastic sheet 3, and the sheet can be processed and formed without heating the hollow support body 2. The forming process of the sheet is simpler and more convenient, and the production and processing are easy to realize.

Since the hollow support bodies 2 are not connected to each other, the hollow support bodies 2 do not affect the molding of the sheet material, and in the process of forming the sheet, the hollow support bodies 2 in the sheet materials are not heated and are not soft, and the hollow support bodies are 2 can be relatively moved with the sheet material, so in the forming process of the sheet material, only the first plastic sheet 1 and the second plastic sheet 3 need to be heated, and it is not necessary to heat the hollow support body 2, and the hollow support body 2 located in the interlayer space 2 The heating is also difficult, so that most of the power can be saved.

There is also a great advantage in not heating the hollow support body 2. During the forming process of the sheet material, the hollow support body 2 basically maintains the original shape, which is advantageous for the forming of the sheet and the shaping after forming, and ensuring the stability of the shape of the sheet forming, and ensuring The structural strength of the formed sheet. The folder has a very high structural strength and a very light weight.

The composite panel also has the following advantages: The intermediate structural layer between the first plastic panel 1 and the second plastic panel 3 has a spatial interlayer, and the spatial interlayer forms a weakening layer with respect to sound, and the spatial interlayer is formed with respect to thermal energy. An interruption layer, which can interfere with and block the transmission of heat and sound, especially thermal energy. Since the air is not thermally conductive, heat energy is hard to be conducted through the interlayer space. Therefore, the present invention can greatly improve the heat insulation of the composite panel. ability.

Furthermore, since the hollow support body 2 is a hollow thin wall body, the hollow support body 2 can further interfere with and block the heat insulation and sound transmission, and increase the heat insulation capacity and sound insulation performance of the composite board. The individual hollow support bodies 2 are independent individuals, which can further interfere with and block the transmission of heat insulation and sound, and increase the heat insulation capacity and sound insulation capacity of the composite board.

In addition, the hollow support body 2 can effectively block the air flow in the interlayer space and reduce the fluidity of the air in the interlayer space, and this design can further improve the sound insulation and heat insulation capability of the composite board. The sound-insulating and heat-insulating ability of the composite board is not simply doubled. In the case where the composite board of the unit volume has the same quality and thickness, the composite of the present invention is compared with the composite board in which the intermediate layer is a foamed plastic. The sound insulation and heat insulation of the board can raise i3⁄4 2. W (人匸

Compared with the hollow plate of the peak-and-socket structure, the composite plate of the present invention has a smaller density, a smaller weight, and a stronger structural strength and better heat insulation performance.

For the hollow support body 2 made of plastic material, the hollow support body 2 can be formed by blistering, since the individual hollow support bodies 2 present in the intermediate structure layer are independent, the independent hollow support body 2 is in the blister It has better bending performance and tensile properties, and is more conducive to the process of plastic forming. The equipment required for production is simpler, and the equipment cost and production cost are reduced. In the case of hot-blown molding, the respective hollow support bodies 2 do not mutually influence each other, and therefore, it is easy to produce a sheet material having a three-dimensional space structure by hot-blown molding, and the sheet material is easily formed into other shapes, for example, The sheet is formed into a curved plate, and the shape of the plate is not limited to a flat plate, and the production process is easy to implement. Embodiment 2

An unstressed weak line high-strength composite board, as shown in Figure 5-6, the main structure of this embodiment is the same as that of the first embodiment, and will not be described here. The difference is: hollow support 2 is a strip-shaped support body, the side surface of the hollow support body 2 has a draft angle, and the side surface of the hollow support body 2 is inclined, and the outer shape of one end surface of the hollow support body 2 is larger than the outer dimension of the other end surface. The bottom surface of the hollow support 2 refers to an end surface having a large area among the two end faces of the hollow support 2, and the top surface of the hollow support 2 refers to an end face having a small area among the two end faces of the hollow support 2. Compared with the first embodiment, the composite plate of the embodiment has better dispersion and balance performance for external force and internal stress, and the density of the plate is smaller and the weight is lighter, but the structural strength is higher, and the various regions are in all directions. The force is very balanced, eliminating the weak points of the force, improving the bending resistance and the flexural modulus, the composite plate is not easily broken or bent, and the composite plate has very good molding and shaping properties. Embodiment 3

An unstressed weak line high-strength composite board, as shown in FIG. 7-8, the main structure of this embodiment is the same as that of the first embodiment, and is not described here again. The difference lies in: no stress weak line high-strength composite board Further comprising a third plastic plate 4, the third plastic plate 4 is disposed in parallel with the first plastic plate 1, a sandwich space is formed between the third plastic plate 4 and the first plastic plate 1, the third plastic plate 4 and the first plastic plate The sandwich space of 1 is provided with a plurality of hollow support bodies 2 having independent thin walls, and each hollow support body 2 is integrally formed between the first plastic plate 1 and the second plastic plate 3 by a plastic forming process. In the sandwich space, the upper end and the lower end of each hollow support 2 are connected to the first plastic plate 1 and the second plastic plate 3, respectively.

The hollow support bodies 2 distributed on both sides of the first plastic plate 1 are symmetrically arranged one by one with the first plastic plate 1 as a plane of symmetry.

The arrangement of the hollow support bodies 2 in this embodiment is the same as that of FIG. 4, and the embodiment is no longer illustrated. Compared with the first embodiment, the composite plate of the embodiment has better dispersion and balance performance for external force and internal stress, and the density of the plate is smaller and the weight is lighter, but the structural strength is higher, and the various regions are in all directions. The force is very balanced, eliminating the weak points of the force, improving the bending resistance and the flexural modulus, the composite plate is not easily broken or bent, and the composite plate has very good molding and shaping properties.

In a preferred embodiment, the second plastic plate 3 and the third plastic plate 4 of the composite plate are disposed in parallel, and the outer surfaces of the second plastic plate 3 and the third plastic plate 4 may be respectively combined with a metal plate or a composite plate. The outer surfaces of the second plastic plate 3 and the third plastic plate 4 may also be respectively laminated with a plastic protective layer. (The metal plate or plastic protective layer is not shown in the figure). Embodiment 4

As shown in FIG. 9-10, the main structure of the present embodiment is the same as that of the third embodiment, and is not described here again. The difference is that: the side of the hollow support body 2 has a At the draft angle, the side surface of the hollow support body 2 is inclined, and the outer shape of one end surface of the hollow support body 2 is larger than the outer size of the other end surface. The stress-free weak line high-strength composite board further includes a third plastic plate 4, the third plastic plate 4 is disposed in parallel with the first plastic plate 1, and a sandwich space is formed between the third plastic plate 4 and the first plastic plate 1, the third The sandwich space of the plastic plate 4 and the first plastic plate 1 is provided with a plurality of hollow support bodies 2 having independent thin walls, and the hollow support bodies 2 are integrally formed on the first plastic plate 1 by a plastic forming process. The sandwich space between the second plastic sheets 3, the upper end and the lower end of each hollow support 2 are connected to the first plastic sheet 1 and the second plastic sheet 3, respectively. In this embodiment, each The arrangement of the empty support 2 is the same as that of Fig. 6, and this embodiment is not illustrated. Embodiment 5

As shown in FIG. 11-13, the main structure of the present embodiment is the same as that of the first embodiment, and is not described here again. The difference is that the hollow support body 2 includes a circular support. The body and the strip support are circular or nearly circular in cross section, and the circular support is arranged in the gap of each strip support. A filling section is formed between the adjacent four strip-shaped supports, and a circular support is disposed at the center of each filling section. The maximum outer diameter of the circular support is 1/3 to 1/5 of the length of the strip-shaped support, and a gap is left between the outer wall of the circular support and the outer wall of the adjacent strip-shaped support.

Compared with the first embodiment, the hollow support body 2 of the present embodiment has two shapes, and the design of the hollow support body 2 in the arrangement can further improve the dispersing ability and balance performance of the composite external force and internal stress, and further Eliminate weak areas and weak lines.

Furthermore, the sheet material of the embodiment has a smaller density and a lighter weight, but the structural strength is higher, the stress in each direction of each region is well balanced, the weak point of the force is eliminated, the bending deflection resistance and the flexural modulus are improved, and the composite is compounded. The board is not easily broken or bent, and the composite panel has very good molding properties.

In this embodiment, a U-shaped support body may be used instead of the circular support body, and the conical support body is a conical hollow support body, which is not illustrated here. Embodiment 6 As shown in FIG. 14-15, the main structure of the present embodiment is the same as that of the fifth embodiment, and is not described here again. The difference is that: the side of the hollow support body 2 has a At the draft angle, the side surface of the hollow support body 2 is inclined, and the outer shape of one end surface of the hollow support body 2 is larger than the outer size of the other end surface.

Example 7

An unstressed weak line high-strength composite board, as shown in Figure 16-17, the main structure of this embodiment is the same as that of the fifth embodiment, and will not be described here. The difference is: no stress weak line high-strength composite board Further comprising a third plastic plate 4, the third plastic plate 4 is disposed in parallel with the first plastic plate 1, and a sandwich space is formed between the third plastic plate 4 and the first plastic plate 1, the third plastic plate 4 and the first plastic plate The sandwich space of 1 is provided with a plurality of hollow support bodies 2 having independent thin walls, and each hollow support body 2 is integrally formed between the first plastic plate 1 and the second plastic plate 3 by a plastic forming process. In the sandwich space, the upper end and the lower end of each hollow support 2 are connected to the first plastic plate 1 and the second plastic plate 3, respectively. The arrangement of the hollow support bodies 2 in this embodiment is the same as that of Fig. 13, and this embodiment is not illustrated.

Example eight

As shown in FIG. 18-19, the main structure of the present embodiment is the same as that of the seventh embodiment, and is not described here again. The difference is that: the side of the hollow support body 2 has a Draft angle, side of hollow support 2 is inclined, hollow support The outer dimension of one end face of 2 is larger than the outer dimension of the other end face.

The arrangement of the hollow support bodies 2 in this embodiment is the same as that of Fig. 15, and this embodiment is not illustrated. Example nine

A folder, as shown in Fig. 20, comprises a plate, wherein one or several creases are formed in the middle of the plate, the plate is divided into two foldable two panels 5 by the folds, and the middle portion of the plate is divided into two creases. The plate is divided into two panels 5 by two creases and a ridge plate 6 between the two panels, and the inner surface of the ridge plate 6 is fixed with a clamp body. The sheet is selected from the unstressed weak line high strength composite sheets described in any one of embodiments 1 to 8.

The folder has a simple structure, low density, and light weight, eliminating the weak force zone and the directional weakness of the board surface.

The above content is only a preferred embodiment of the present invention, and those skilled in the art will have a change in the specific embodiment and application scope according to the idea of the present invention. The content of the present specification should not be construed as the present invention. limits.

Claims

Claim

1. A stress-free weak line high-strength composite board comprising a first plastic sheet (1), a plurality of hollow support bodies each having a separate thin wall body formed by a plastic forming process

(2) forming a sandwich space between the first plastic plate (3), the first plastic plate (1) and the second plastic plate (3), and each hollow support body (2) is integrally formed by the plastic forming process at the first a sandwich space between the plastic plate (1) and the second plastic plate (3), the upper and lower ends of each hollow support body (2) are respectively coupled to the corresponding first plastic plate (1) and the second plastic plate (3) The hollow support body (2) comprises a strip-shaped support body, the length of the strip-shaped support body is greater than the width, and the strip-shaped support bodies are arranged in a crisscross manner.

2 . The stress-free weak line high-strength composite board according to claim 1 , wherein: the strip-shaped support has a transverse cross-section shape similar to a rectangle, wherein the portion is a straight wall surface and the two ends are curved. surface.

3. The stress-free line-strength high-strength composite panel according to claim 1, wherein the two ends of the strip-shaped support body are respectively aligned with the middle of the adjacent strip-shaped support bodies on both sides. Position or position away from the middle.

4. The stress-free weak line high-strength composite panel according to claim 1, wherein: the hollow support body (2) comprises a circular support body or a tapered support body, and a transverse cross section of the circular support body Round or nearly circular, a circular support or a tapered support is arranged in the gap of each strip support.

5. The stress-free line-strength high-strength composite panel according to claim 4, wherein: the adjacent four strip-shaped supports enclose a filling section, and a center position of each filling section A circular support or a tapered support is provided.

6 . The stress-free weak line high-strength composite board according to claim 4 , wherein: the maximum outer diameter of the circular support body is 1/3 to 1/5 of the length of the strip-shaped support body, A gap is left between the outer wall of the circular support and the outer wall of the adjacent strip support.

7. The stress-free weak line high-strength composite panel according to claim 1, wherein: the side surface of the hollow support body (2) has a draft angle, and the side surface of the hollow support body (2) is inclined. The outer dimension of one end surface of the hollow support body (2) is larger than the outer dimension of the other end surface.

8. The stress-free weak line high-strength composite board according to claim 1, wherein: the stress-free weak line high-strength composite board further comprises a third plastic board (4), and a third plastic board (4) ) is disposed in parallel with the first plastic plate (1), a sandwich space is formed between the third plastic plate (4) and the first plastic plate (1), and the third plastic plate (4) and the first plastic plate (1) The sandwich space is provided with a plurality of hollow support bodies (2) having independent thin walls, and each hollow support body (2) is integrally formed on the first plastic plate by a plastic forming process.

(1) The interlayer space between the second plastic plate (3) and the upper and lower ends of each hollow support body (2) are respectively connected to the first plastic plate (1) and the second plastic plate (3).

9. The stress-free weak line high-strength composite panel according to claim 8, wherein: the hollow support bodies (2) distributed on both sides of the first plastic plate (1) are respectively made of a first plastic plate ( 1) Symmetrical settings for the plane of symmetry.

10 . The stress-free weak line high-strength composite board according to claim 8 , wherein: the second plastic plate ( 3 ) and the third plastic plate ( 4 ) are arranged in parallel, and the second plastic plate ( 3 ) And the outer surface of the third plastic plate (4) is respectively laminated with a metal plate or a plastic protective layer.

The stress-free weak line high-strength composite board according to claim 1, wherein: the outer surfaces of the first plastic plate (1) and the second plastic plate (3) are respectively combined with a metal plate Or a plastic protective layer.

12. A type of folder comprising a sheet, wherein one or more creases are formed in the middle of the sheet, the sheet is divided into two foldable panels (5) by sub-folds, characterized in that: the sheet is selected according to claims 1-11 The stress-free weak line high strength composite board according to any one of the preceding claims.

The folder according to claim 12, wherein: the middle portion of the plate is divided into two creases, and the plate is divided into two panels (5) by two creases and between the two panels. The spine plate (6), the inner surface of the spine plate (6) is fixed with a clip body.