Paperboard piece and packaging box

Abstract

The utility model relates to a paperboard piece and a packaging box. The paperboard piece comprises a face paperboard and grid supporting paper. And along the thickness direction of the surface paperboards, the two sides of the grid supporting paper are respectively provided with the surface paperboards. The grid supporting paper comprises a net knot part, a hollow hole, a transition connecting part and a reinforcing bonding part. And a transition connecting part is arranged between any two adjacent net knot parts. And a gap is formed between the transition connecting part and the surface paper board. The net knot part comprises two connecting parts. And at least one of the two connecting parts is provided with a reinforcing bonding part. The face paper boards on the two sides of the grid supporting paper are bonded with the two connecting parts respectively, and the reinforcing bonding parts are bonded with the face paper boards. According to the paperboard piece provided by the embodiment of the invention, the bonding strength between the grid supporting paper and the surface paperboard can be enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the packaging technical field, and in particular to a paperboard piece and a packaging box. BACKGROUND

[0002] The composite paperboard includes a face paper and an intermediate paper product. The face paper is generally thin, and the intermediate paper product can be a paperboard material, because the existing intermediate paper product is generally large in thickness, weight and hardness, and mainly plays a supporting and buffering role, for example, mainly corrugated paper. The corrugated paper is in a whole wave shape. Generally, 1 meter length of the composite paperboard needs 1.5 meters length of the corrugated paper. The amount of the corrugated paper is relatively large, and at the same time, the weight of the composite paperboard per unit volume is relatively heavy. The intermediate paper product can also be, for example, a grid paper, which is beneficial to reduce the weight of the composite paperboard per unit volume. Because the bonding area between the grid paper and the face paper is small, the connection strength between the grid paper and the face paper is poor, and thus there is a risk of delamination and peeling between the grid paper and the face paper, so that the face paper is easy to be layered with the grid paper, resulting in poor compression resistance and damage resistance of the composite paperboard, and easy to cause product quality problems. CONTENT OF THE UTILITY MODEL

[0003] The paperboard piece and the packaging box provided by the embodiments of the present application are beneficial to strengthen the bonding strength between the grid support paper and the face paperboard.

[0004] The paperboard piece provided by the embodiments of the present application includes a face paperboard and a grid support paper.

[0005] Along the thickness direction of the face paperboard, the grid support paper is provided with the face paperboard on both sides. The grid support paper includes a net knot part, a hollow hole, a transition connection part and a reinforced bonding part. The transition connection part is arranged between any two adjacent net knot parts. The transition connection part has a spacing with the face paperboard. The net knot part includes two connection parts. The reinforced bonding part is arranged on at least one of the two connection parts. The face paperboard on both sides of the grid support paper is bonded with the two connection parts, and the reinforced bonding part is bonded with the face paperboard.

[0006] The paperboard piece of the embodiment of the application comprises a grid support paper and a surface paperboard. Both the grid support paper and the surface paperboard are of paper material, which is environmentally friendly and not easy to pollute the environment. The grid support paper is a three-dimensional grid paper with a plurality of hollow holes. The unit volume weight of the grid support paper is relatively small, which is conducive to reducing the unit volume weight of the paperboard piece, thereby facilitating the reduction of the overall weight of the paperboard piece. The grid support paper can provide support to the surface paperboard, improving the impact resistance and extrusion resistance of the surface paperboard. When the surface paperboard is subjected to an impact force or an extrusion force, the surface paperboard can transmit the force to the grid support paper and disperse and buffer the force through the grid support paper. In the grid support paper, the reinforcing adhesive parts provided on the net knot parts correspond to the hollow holes. The reinforcing adhesive parts can reuse the space at the hollow holes. The connecting parts and the reinforcing adhesive parts are respectively adhered to the surface paperboard, thereby increasing the adhesive area between the grid support paper and the surface paperboard, facilitating the strengthening of the adhesive strength between the grid support paper and the surface paperboard, reducing the possibility of delamination and peeling between the grid support paper and the surface paperboard due to the relatively small adhesive strength between the grid support paper and the surface paperboard, improving the pressure resistance and damage resistance of the paperboard piece, and improving the product quality of the paperboard piece.

[0007] In some implementable manners, the two connecting parts are each provided with a reinforcing adhesive part.

[0008] In some implementable manners, the net knot part comprises opposite first and second surfaces, the first and second surfaces respectively face the surface paperboards on two sides of the grid support paper, the reinforcing adhesive part on one connecting part is folded towards the first surface, and the reinforcing adhesive part on the other connecting part is folded towards the second surface.

[0009] In some implementable manners, along the axial direction of the hollow hole, the area of the orthogonal projection of the reinforcing adhesive part is smaller than the area of the orthogonal projection of the hollow hole.

[0010] In some implementable manners, the angle between the axial direction of the hollow hole and the thickness direction of the surface paperboard is K, where 50°≤K≤85°.

[0011] In some implementable manners, the connecting part has a notch, the shape and size of the notch are the same as those of the reinforcing adhesive part, along the circumferential direction of the hollow hole, the reinforcing adhesive parts provided on the same connecting part are alternately arranged with the notches, and along the axial direction of the hollow hole, the reinforcing adhesive part on one connecting part is arranged corresponding to the notch on the other connecting part.

[0012] In some implementable manners, one reinforcing adhesive part and one notch are provided on the same connecting part.

[0013] In some implementable manners, the grid support paper is of an integrally formed three-dimensional structure.

[0014] In some possible implementation manners, the structure of the grid support paper is that: a plurality of rows of longitudinal slits are arranged on the paper along the transverse direction of the paper, each row of longitudinal slits includes a plurality of longitudinal slits, and adjacent two rows of longitudinal slits are staggered, the two ends of the paper are stretched along the transverse direction of the paper, the longitudinal slits are torn open, and the paper between adjacent two longitudinal slits is twisted under the stretching action to form the grid support paper.

[0015] In some possible implementation manners, the grid support paper includes an edge connecting portion connected with the outermost knot portion, a reinforcing adhesive portion is arranged on the edge connecting portion, and the edge connecting portion and the reinforcing adhesive portion arranged on the edge connecting portion are respectively adhered to the face paperboard.

[0016] In some possible implementation manners, the shape of the reinforcing adhesive portion is triangular, rectangular or arc-shaped.

[0017] The paperboard piece is used in a packaging box. BRIEF DESCRIPTION OF DRAWINGS

[0018] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0019] Figure 1 is a partial structure schematic view of a paperboard piece according to an embodiment of the present application;

[0020] Figure 2 is a partial structure schematic view of a paperboard piece according to an embodiment of the present application;

[0021] Figure 3 is a partial structure schematic view of a paperboard piece according to an embodiment of the present application;

[0022] Figure 4 is a partial structure schematic view of a paperboard piece according to an embodiment of the present application;

[0023] Figure 5 is a partial structure schematic view of a grid support paper according to an embodiment of the present application;

[0024] Figure 6 is a schematic view of a forming process of a grid support paper according to an embodiment of the present application;

[0025] Figure 7 is a partial structure schematic view of a grid support paper according to an embodiment of the present application.

[0026] In the drawings, the same components are designated by the same reference numerals. The drawings are not drawn according to the actual proportions.

[0027] Explanation of Reference Numerals:

[0028] 10, paperboard piece;

[0029] 20, face paper board;

[0030] 30, grid support paper; 31, net knot; 31a, first surface; 31b, second surface; 311, connecting portion; 3111, notch; 32, hollow hole; 33, transition connecting portion; 34, reinforced bonding portion; 35, edge connecting portion;

[0031] 100, paper;

[0032] 110, longitudinal slot;

[0033] X, thickness direction;

[0034] O, axial direction. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the examples and the accompanying drawings are provided for the purpose of illustration only and are not intended to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0036] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0037] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0038] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] Figure 1 The partial structure of the paperboard piece 10 is schematically shown. Figure 2 The partial structure of the paperboard piece 10 is schematically shown. Figure 3 The partial structure of the paperboard piece 10 is schematically shown. Figure 4 The partial structure of the paperboard piece 10 is schematically shown. Figure 5 The partial structure of the grid support paper 30 is schematically shown. Figure 6 The forming process of the grid support paper 30 is schematically shown. Figure 7 The partial structure of the grid support paper 30 is schematically shown. In order to better understand the present application, the following will be described in combination with Figures 1 to 7 The partial structure of the paperboard piece 10 is schematically shown.

[0040] Referring to Figures 1 to 5 The paperboard piece 10 provided by the embodiments of the present application includes a face paperboard 20 and a grid support paper 30.

[0041] Along the thickness direction X of the face paperboard 20, the grid support paper 30 is provided with the face paperboard 20 on both sides. The grid support paper 30 includes a net knot part 31, a hollow hole 32, a transition connecting part 33, and a reinforced adhesive part 34. The transition connecting part 33 is provided between any two adjacent net knot parts 31. The transition connecting part 33 has a spacing with the face paperboard 20. The net knot part 31 includes two connecting parts 311. The reinforced adhesive part 34 is provided on at least one of the two connecting parts 311. The face paperboard 20 on both sides of the grid support paper 30 is adhered to the two connecting parts 311, and the reinforced adhesive part 34 is adhered to the face paperboard 20.

[0042] In the paperboard piece 10 of the embodiments of the present application, the face paperboard 20 on both sides clamps the grid support paper 30. The grid support paper 30 is a grid paper with a hollow hole 32. The unit volume weight of the grid support paper 30 itself is relatively small, which is conducive to reducing the unit volume weight of the paperboard piece 10, thereby facilitating the reduction of the overall weight of the paperboard piece 10. The grid support paper 30 can play a supporting role on the face paperboard 20 on both sides, improving the impact resistance and extrusion resistance of the face paperboard 20 on both sides. When the face paperboard 20 is subjected to impact force or extrusion force, the force can be dispersed and buffered through the grid support paper 30.

[0043] The grid support paper 30 includes multiple mesh sections 31. Multiple mesh sections 31 can be provided circumferentially around each perforation 32. The face paper 20 on both sides is connected to the mesh sections 31 of the grid support paper 30. When the face paper 20 is subjected to impact or compression, the face paper 20 can transmit the force to the grid support paper 30 through the mesh sections 31, and the grid support paper 30 can disperse and buffer the force. The grid support paper 30 itself has a relatively simple structure, is easy to process and form, and helps reduce the processing cost of the paperboard 10.

[0044] Each knot 31 includes two connecting portions 311. Along the thickness direction X of the face paper 20, one connecting portion 311 is close to one side of the face paper 20, while the other connecting portion 311 is close to the other side of the face paper 20. The face paper 20 on both sides is bonded to the two connecting portions 311 respectively.

[0045] In the cardboard component 10, the mesh knot 31 is inclined. The mesh knot 31 can be connected to both side cardboard sheets 20 simultaneously via two connecting parts 311. The two side cardboard sheets 20 provide support for the mesh knot 31, which helps improve the connection stability and reliability of the mesh knot 31. At the same time, the mesh knot 31 pulls on the two side face cardboard sheets 20. When the face cardboard sheet 20 is subjected to impact or compression force, the face cardboard sheet 20 can transmit the force to the grid support paper 30 through the mesh knot 31, which helps improve the cushioning and energy absorption effect.

[0046] The grid support paper 30 includes transition connecting portions 33. A transition connecting portion 33 is provided between any two adjacent mesh knots 31. There is a gap between the transition connecting portion 33 and the face paper 20. Each mesh knot 31 can be connected to multiple transition connecting portions 33. When the face paper 20 is subjected to impact or compression force, the face paper 20 can transmit the force to the mesh knot 31, and then the mesh knot 31 can transmit the force to the transition connecting portion 33, thereby dispersing and buffering the force.

[0047] See also some of the possible implementation methods. Figure 4 As shown, there is a gap between the transition connection 33 and the face paper 20. Different perforations 32 can be connected through this gap.

[0048] See also some of the possible implementation methods. Figure 5 As shown, four mesh sections 31 can be provided around a single perforated hole 32. Each mesh section 31 can be connected to four transition connecting sections 33.

[0049] The paperboard piece 10 of the embodiment of the present application comprises a grid support paper 30 and a face paperboard 20. Both the grid support paper 30 and the face paperboard 20 are of paper material, which is environmentally friendly and not easy to pollute the environment. The grid support paper 30 is a three-dimensional grid paper with a plurality of hollow holes 32. The unit volume weight of the grid support paper 30 is relatively small, which is conducive to reducing the unit volume weight of the paperboard piece 10, thereby facilitating the reduction of the overall weight of the paperboard piece 10. The grid support paper 30 can provide support to the face paperboard 20, improving the impact resistance and extrusion resistance of the face paperboard 20. When the face paperboard 20 is subjected to impact force or extrusion force, the face paperboard 20 can transmit the force to the grid support paper 30 and disperse and buffer through the grid support paper 30. In the grid support paper 30, the reinforcing adhesive portions 34 provided on the net joint portions 31 correspond to the hollow holes 32. The reinforcing adhesive portions 34 can reuse the space at the hollow holes 32. The connecting portions 311 and the reinforcing adhesive portions 34 are respectively adhered to the face paperboard 20, thereby increasing the adhesive area between the grid support paper 30 and the face paperboard 20, facilitating the reinforcement of the adhesive strength between the grid support paper 30 and the face paperboard 20, reducing the possibility of delamination and peeling between the grid support paper 30 and the face paperboard 20 due to the relatively small adhesive strength therebetween, improving the pressure resistance and damage resistance of the paperboard piece 10, and improving the product quality of the paperboard piece 10.

[0050] In some possible implementations, as shown in Figure 4 and Figure 5 , the two connecting portions 311 in the same net joint portion 31 are both provided with reinforcing adhesive portions 34. The reinforcing adhesive portion 34 on one connecting portion 311 is adhered to one side of the face paperboard 20, and the reinforcing adhesive portion 34 on the other connecting portion 311 is adhered to the other side of the face paperboard 20.

[0051] The face paperboards 20 on both sides of the grid support paper 30 are respectively adhered to the corresponding connecting portions 311 and reinforcing adhesive portions 34, which is conducive to increasing the adhesive area between the grid support paper 30 and the face paperboards 20 on both sides and facilitating the reinforcement of the adhesive strength between the grid support paper 30 and the face paperboards 20 on both sides.

[0052] In some examples, as shown in Figure 4 and Figure 5 , the net joint portion 31 comprises opposite first and second surfaces 31a and 31b. The first and second surfaces 31a and 31b respectively face the face paperboards 20 on both sides of the grid support paper 30. The reinforcing adhesive portion 34 on one connecting portion 311 is folded towards the first surface 31a, and the reinforcing adhesive portion 34 on the other connecting portion 311 is folded towards the second surface 31b.

[0053] The first surface 31a and the second surface 31b of the mesh portion 31 can be respectively provided facing different perforations 32. The reinforcing adhesive portions 34 provided on the two connecting portions 311 have opposite folding directions. The reinforcing adhesive portion 34 provided on one connecting portion 311 can be folded towards one perforation 32, and the reinforcing adhesive portion 34 provided on the other connecting portion 311 can be folded towards the other perforation 32. Exemplarily, the reinforcing adhesive portion 34 provided on one connecting portion 311 can form a first adhesive joint with the face paper 20, and the reinforcing adhesive portion 34 provided on the other connecting portion 311 can form a second adhesive joint with the face paper 20. The first adhesive joint and the second adhesive joint are respectively located on both sides of the mesh portion 31.

[0054] For the same network junction 31, see Figure 4 and Figure 5 As shown, along the axial direction O of the perforation 32, the orthographic projection of the reinforcing adhesive portion 34 on one connecting portion 311 does not overlap with the orthographic projection of the reinforcing adhesive portion 34 on the other connecting portion 311. The reinforcing adhesive portion 34 on one connecting portion 311 forms a first adhesive joint with the face paper 20, and the reinforcing adhesive portion 34 on the other connecting portion 311 forms a second adhesive joint with the face paper 20. Along the axial direction O of the perforation 32, the orthographic projections of the first and second adhesive joints do not overlap.

[0055] See in some examples Figure 5 As shown, along the axial direction O of the perforated hole 32, the projected area of ​​the reinforcing adhesive portion 34 is smaller than the projected area of ​​the perforated hole 32. The reinforcing adhesive portion 34 can cover a part of the perforated hole 32, but does not cover the entire perforated hole 32.

[0056] While ensuring the bonding strength between the reinforcing adhesive part 34 and the face paper 20, the reinforcing adhesive part 34 itself is relatively small in size, which makes the reinforcing adhesive part 34 occupy less space and also helps to reduce the overall weight of the grid support paper 30.

[0057] See in some examples Figure 4 As shown, the angle between the axial direction O of the perforated hole 32 and the thickness direction X of the face paper 20 is K, where 50° ≤ K ≤ 85°. For example, the angle K between the axial direction O of the perforated hole 32 and the thickness direction X of the face paper 20 is equal to 55°, 60°, 70°, or 80°. An angle K that is too large or too small may result in insufficient support capacity of the grid support paper 30. In practice, the size of the angle K can be adjusted according to actual needs.

[0058] See in some examples Figure 5As shown, the connecting portion 311 has a notch 3111. The notch 3111 has the same shape and size as the reinforcing adhesive portion 34. Along the circumferential direction of the hollow hole 32, the reinforcing adhesive portions 34 and the notches 3111 are arranged alternately on the same connecting portion 311. Along the axial direction O of the hollow hole 32, the reinforcing adhesive portion 34 on one connecting portion 311 is arranged correspondingly to the notch 3111 on another connecting portion 311.

[0059] The arrangement of the notches 3111 on the net knot portion 31 is conducive to reducing the area of the net knot portion 31, thereby reducing the overall weight of the grid support paper 30. The reinforcing adhesive portions 34 and the notches 3111 arranged on the same connecting portion 311 are arranged alternately, so that the reinforcing adhesive portions 34 do not block the notches 3111.

[0060] In some examples, referring to Figure 5 As shown, one reinforcing adhesive portion 34 and one notch 3111 are arranged on the same connecting portion 311. When the reinforcing adhesive portion 34 arranged on the connecting portion 311 meets the reinforcing adhesive strength, it is conducive to reducing the number of reinforcing adhesive portions 34, reducing the overall processing difficulty of the grid support paper 30, and also conducive to reducing the overall weight of the grid support paper 30.

[0061] When one notch 3111 is arranged on the connecting portion 311, the number of notches 3111 is relatively small, reducing the possibility of the overall support capacity of the net knot portion 31 being reduced due to the arrangement of a large number of notches 3111.

[0062] In some examples, referring to Figure 5 As shown, the notch 3111 penetrates the first surface 31a and the second surface 31b of the net knot portion 31. The notch 3111 has an opening facing the face paperboard 20.

[0063] In some examples, the grid support paper 30 is an integrally formed three-dimensional structure, which is conducive to improving the overall structural strength of the grid support paper 30 and improving the overall energy buffering capacity of the grid support paper 30. The grid support paper 30 can be arranged integrally between the two side face paperboards 20 and connected with the two side face paperboards 20, reducing the difficulty of assembling the grid support paper 30 and the face paperboard 20.

[0064] In some examples, the grid support paper 30 can be kraft paper. The grid support paper 30 itself has good flexibility, so that the grid support paper 30 itself has stable structure and is not easy to deform, has good supporting capacity, and at the same time, the grid support paper 30 can be naturally degraded and will not pollute the environment.

[0065] In some examples, referring to Figure 5 and Figure 6As shown, the structure of the grid support paper 30 is that: along the transverse direction of the paper 100, a plurality of rows of longitudinal slits 110 are arranged on the paper 100, each row of longitudinal slits 110 includes a plurality of longitudinal slits 110, and adjacent two rows of longitudinal slits 110 are staggered, the two ends of the paper 100 are stretched along the transverse direction of the paper 100, the longitudinal slits 110 are torn open, and the paper 100 between adjacent two longitudinal slits 110 is twisted under the stretching action to form a grid support paper 30 including a knot part 31, a hollow hole 32, a transition connecting part 33 and a reinforced bonding part 34.

[0066] In some examples, after the paper 100 is stretched and twisted to form the grid support paper 30, the reinforced bonding part 34 is pressed down. For example, a roller can be used to press the reinforced bonding part 34 to press the reinforced bonding part 34 down. Then, the connecting part 311 and the reinforced bonding part 34 are coated with an adhesive, and then the face paper board 20 is bonded and laminated with the grid support paper 30. The connecting part 311 and the reinforced bonding part 34 are bonded with the face paper board 20, respectively.

[0067] In some examples, a rotary cutting knife is used to cut the paper 100 to form a plurality of rows of longitudinal slits 110 on the paper 100. The shape of the cutting knife matches the shape of the longitudinal slit 110. Along the circumference of the roller, a plurality of rows of cutting knives are arranged on the roller. Each row of cutting knives includes a plurality of cutting knives. Adjacent two rows of cutting knives are staggered. One cutting knife can cut a longitudinal slit 110 with the same shape on the paper 100.

[0068] In some examples, the thickness of the paper 100 can be 0.1 millimeter (mm) to 0.2 millimeter.

[0069] In some realizable ways, referring to Figure 7 As shown, the grid support paper 30 includes an edge connecting part 35. The edge connecting part 35 is connected with the outermost knot part 31. The reinforced bonding part 34 is arranged on the edge connecting part 35. The edge connecting part 35 and the reinforced bonding part 34 arranged on the edge connecting part 35 are bonded with the face paper board 20, respectively.

[0070] The part of the edge area of the grid support paper 30 which is not formed into a complete hollow hole 32 forms the edge connecting part 35. The area of the grid support paper 30 other than the edge connecting part 35 is a complete hollow hole 32 structure. The edge connecting part 35 and the reinforced bonding part 34 arranged on the edge connecting part 35 are bonded with the face paper board 20, respectively. This facilitates increasing the bonding area between the edge area of the grid support paper 30 and the face paper board 20, and facilitates strengthening the bonding strength between the edge area of the grid support paper 30 and the face paper board 20, and reduces the possibility of delamination and peeling between the edge connecting part 35 and the face paper board 20 due to the relatively small bonding strength between the edge connecting part 35 and the face paper board 20.

[0071] If the edge connecting part 35 and the face paperboard 20 are delaminated or peeled, the edge of the face paperboard 20 is prone to be warped under the pulling force, which affects the appearance of the paperboard piece 10. Meanwhile, the edge of the grid support paper 30 loses the protection of the face paperboard 20, which also reduces the compression and impact resistance of the paperboard piece 10 in the edge area.

[0072] In some implementable manners, the shape of the reinforced bonding part 34 can be rectangular. The shape of the reinforced bonding part 34 itself is relatively regular, and the difficulty of processing the reinforced bonding part 34 in a machining manner is relatively low, which is conducive to reducing the processing cost.

[0073] In some implementable manners, the shape of the reinforced bonding part 34 can be triangular or circular arc. Compared with the scheme that the reinforced bonding part 34 is rectangular, the area of the circular arc or triangular reinforced bonding part 34 itself is relatively small under the condition that the height of the circular arc or triangular reinforced bonding part 34 itself protruding from the net knot part 31 is equal to the width of the rectangular reinforced bonding part 34, and the bottom edge of the circular arc or triangular reinforced bonding part 34 itself is equal to the length of the rectangular reinforced bonding part 34, so that the amount of adhesive coated on the reinforced bonding part 34 is relatively small when the reinforced bonding part 34 and the face paperboard 20 meet the bonding strength requirement, which is conducive to saving the amount of adhesive used and reducing the processing cost.

[0074] The paperboard piece 10 is used to fold and connect to form a packaging box that meets the product requirements according to the size and style design of the packaging box.

[0075] Although the present application has been described with reference to the preferred embodiments, various improvements can be made thereto without departing from the scope of the application, and equivalent substitutions can be made thereto. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A paperboard piece, characterized in that, The paperboard piece comprises: a face paperboard and a grid support paper; two sides of the grid support paper are respectively provided with the face paperboard along the thickness direction of the face paperboard, the grid support paper comprises a net knot part, a hollow hole, a transition connecting part and a reinforced adhesive part, the transition connecting part is arranged between any two adjacent net knot parts, the transition connecting part has a spacing with the face paperboard, the net knot part comprises two connecting parts, the reinforced adhesive part is arranged on at least one of the two connecting parts, the face paperboard on the two sides of the grid support paper is respectively adhered to the two connecting parts, and the reinforced adhesive part is adhered to the face paperboard.

2. The paperboard piece of claim 1, wherein, Both of the two connecting parts are provided with the reinforced adhesive part.

3. The paperboard piece of claim 2, wherein, The net knot part comprises opposite first and second surfaces, the first and second surfaces respectively face the face paperboard on the two sides of the grid support paper, the reinforced adhesive part on one of the connecting parts is folded towards the first surface, and the reinforced adhesive part on the other connecting part is folded towards the second surface.

4. The paperboard piece of claim 2, wherein, The projection area of the reinforced adhesive part along the axial direction of the hollow hole is smaller than the projection area of the hollow hole.

5. The paperboard piece of claim 4, wherein, The angle between the axial direction of the hollow hole and the thickness direction of the face paperboard is K, wherein 50°≤K≤85°.

6. The paperboard piece according to any one of claims 2 to 5, characterized in that, The connecting part has a notch, the shape and size of the notch are the same as those of the reinforced adhesive part, the reinforced adhesive part and the notch on the same connecting part are alternately arranged along the circumferential direction of the hollow hole, and the reinforced adhesive part on one connecting part is arranged corresponding to the notch on the other connecting part along the axial direction of the hollow hole.

7. The paperboard piece of claim 6, wherein, One reinforced adhesive part and one notch are arranged on the same connecting part.

8. The paperboard piece of claim 6, wherein, The grid support paper is an integral three-dimensional structure.

9. The paperboard piece of claim 8, wherein, The grid support paper has the following structure: a plurality of rows of longitudinal slots are arranged on the paper along the transverse direction of the paper, each row of longitudinal slots comprises a plurality of longitudinal slots, and adjacent two rows of longitudinal slots are staggered, the two ends of the paper are stretched along the transverse direction of the paper, the longitudinal slots are torn open, and the paper between adjacent two longitudinal slots is twisted under the stretching action to form the grid support paper.

10. The paperboard piece according to any one of claims 1 to 5, characterized in that, The grid support paper comprises an edge connecting part connected with the outermost net knot part, the edge connecting part is provided with the reinforced adhesive part, and the edge connecting part and the reinforced adhesive part arranged on the edge connecting part are respectively adhered to the face paperboard.

11. The paperboard piece according to any one of claims 1 to 5, characterized in that, The shape of the reinforced adhesive part is triangular, rectangular or circular arc.

12. A packaging box, characterized in that The paperboard piece comprises any one of claims 1-11.

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