A butterfly inner folding paper box formed by combining paper and plastic

Abstract

This invention discloses a paper-plastic combined butterfly-shaped inward-folding paper box, including a box body and a ring of plastic parts wrapped around the edge of the box body. The box body is folded from a flat cardboard, which includes a bottom plate for forming the bottom of the box and a box body connected around the edge of the bottom plate. The box body includes several side plates and a foldable sealing connecting plate that allows seamless connection between adjacent side plates. The sealing connecting plate has two fold lines that divide it into a first triangular plate, a second triangular plate, and a third triangular plate. The first and third triangular plates are located on both sides of the second triangular plate and are connected to one side plate respectively. When the paper box is formed, the first and third triangular plates are folded outward to connect with the outer surface of the second triangular plate. The inner surfaces of the first and third triangular plates are connected to the inner surfaces of their adjacent side plates, giving the box body strong leak-proof function and structural strength.

Description

Technical Field

[0001] The invention relates to the technical field of food packaging, and in particular to a butterfly inner folding paper box formed by combining paper and plastic. Background Art

[0002] The existing leak-proof paper boxes on the market are generally paper bowls formed by gluing multiple pieces of paper together, or square corner boxes formed by folding and gluing one-piece cardboard. However, no matter which of the above is used, firstly, the structural strength of the leak-proof paper boxes in the prior art is limited by the thickness of the cardboard. When the cardboard is thin, the structural strength of the leak-proof paper boxes is low and it is easy to deform, which makes customers feel that the texture of the leak-proof paper boxes is low; secondly, the leak-proof paper boxes have connecting seams of cardboard splicing or cut surfaces of cardboard. Under long-term immersion, liquid will leak out from the connection between multiple pieces of cardboard or from the cut surfaces of cardboard, causing the paper box to be soaked by liquid and damaged. Therefore, it is necessary to provide a leak-proof paper box that can resist soaking for a long time. Summary of the invention

[0003] The purpose of the present invention is to provide a butterfly inner folding paper box formed by combining paper and plastic, so as to solve the problem that the leakage-proof paper box in the prior art cannot resist liquid soaking for a long time.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A butterfly inner folding paper box formed by combining paper and plastic, comprising a box body and a circle of plastic parts wrapped around the edge of the box body, the box body is folded from a flat cardboard, the cardboard comprises a bottom plate for forming the bottom of the box and a box body connected around the edge of the bottom plate, the box body comprises a plurality of side panels and a foldable sealing connecting plate that seamlessly connects adjacent side panels, characterized in that two folding lines are provided on the sealing connecting plate to divide it into a first triangular plate, a second triangular plate and a third triangular plate, the first triangular plate and the third triangular plate are respectively located on both sides of the second triangular plate and are respectively connected to one of the side panels, when the paper box is formed, the first triangular plate and the third triangular plate are both folded outwards and connected to the outer surface of the second triangular plate, and the inner surfaces of the first triangular plate and the third triangular plate are respectively connected to the inner surfaces of the side panels adjacent to them.

[0006] As a further solution of the present invention: after the paper box is formed, the adjacent side panels are butt-jointed.

[0007] As a further solution of the present invention: after the paper box is formed, the top ends of the first triangular plate, the second triangular plate and the third triangular plate are flush.

[0008] As a further solution of the present invention: after the box body is formed, the top end surface of the second triangular plate is lower than the edge end surface of the box body to form an avoidance step, and the plastic part includes a plastic part main body bonded to the inner surface of the side panel and a edging plastic part bonded to the top of the inner surface of the second triangular plate, and a step surface bonded to the avoidance step is provided between the plastic part main body and the edging plastic part.

[0009] As a further solution of the present invention: the plastic part main body includes a sealing plate and a first folded edge and a second folded edge respectively arranged on both side edges of the lower end of the sealing plate, the sealing plate is located above the edge end surface of the box body and partially extends to the outside of the box body, the first folded edge is bonded to the inner surface of the side panel and is integrally formed with the edging plastic part, and there is a distance between the second folded edge and the side panel.

[0010] As a further solution of the present invention: the bottom end surface of the first folded edge is the step surface, and the edging plastic part is integrally formed on the outer surface of the first folded edge and partially extends to the bottom of the first folded edge.

[0011] As a further solution of the present invention: the paperboard is cardboard with inner side coated or laminated.

[0012] As a further solution of the present invention: the box body is a square box with rounded corners.

[0013] As a further solution of the present invention: the box body is a square box with pointed corners.

[0014] Beneficial effects of the present invention: The present application provides a sealing connecting plate between adjacent side panels so that the box body can be folded into shape by a piece of cardboard, and there is no cardboard cross-section on the inner surface of the box body after forming, so that the box body has a strong leak-proof function, and a three-layer overlapping structure is formed at the corner of the box body, and a plastic part is provided at the edge of the box body, so that the box body has a strong structural strength and avoids deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the structure of the box body in the present invention in a square shape with rounded corners;

[0017] Figure 2 It is a structural schematic diagram of the box body in the unfolded state in the present invention;

[0018] Figure 3 It is a structural schematic diagram of the box body in the present invention in a forming state;

[0019] Figure 4 yes Figure 3 The structural diagram at A in the middle;

[0020] Figure 5 yes Figure 1 sectional view of

[0021] Figure 6 yes Figure 5 The structural intention at B in the middle;

[0022] Figure 7 It is a schematic structural diagram of the box body of the present invention having a square sharp corner. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-2 As shown, the present invention is a butterfly inner folding paper box formed by combining paper and plastic, comprising a box body 1 and a circle of plastic parts 2 wrapped around the edge of the box body 1, the box body 1 is folded from a flat cardboard, the cardboard comprises a bottom plate 11 for forming the bottom of the box and a box body connected around the edge of the bottom plate 11, the box body comprises a plurality of side plates 12 and a foldable sealing connecting plate 13 that seamlessly connects adjacent side plates 12. Specifically, the bottom plate 11 is a polygon, which can be set to a quadrilateral, pentagon, hexagon, etc., which is not specifically limited here. The side plate 12 is a trapezoidal plate whose bottom end is connected to the folding line of the bottom plate 11, and the sealing connecting plate 13 is a generally fan-shaped fan-shaped plate, and two radially distributed folding lines are provided on the sealing connecting plate 13 to divide the sealing connecting plate 13 into a first triangular plate 131, a second triangular plate 132 and a third triangular plate 133, and the first triangular plate 131 and the third triangular plate 133 are respectively located on both sides of the second triangular plate 132 and are respectively connected to the adjacent side plate 12 through the folding line.

[0025] When the box body 1 is formed, several side panels 12 are folded upward relative to the bottom panel 11, and the first triangular panel 131 and the third triangular panel 133 are folded to the outside of the second triangular panel 132, so that the adjacent side panels 12 are close to each other, until the outer surfaces of the first triangular panel 131 and the third triangular panel 133 are fitted with the outer surface of the second triangular panel 132, and the inner surfaces of the first triangular panel 131 and the third triangular panel 133 are respectively fitted with the inner surfaces of the adjacent side panels 12. The outer surfaces of the first triangular panel 131 and the third triangular panel 133 are bonded to the outer surface of the second triangular panel 132, and the inner surfaces of the first triangular panel 131 and the third triangular panel 133 are respectively bonded to the inner surfaces of the adjacent side panels 12, so that the second triangular panel 132 is bent to form a conical angle. After the paper box 1 is formed, the angle of the box body 1 forms a three-layer structure with inner and outer layers stacked inside and outside, which greatly improves the strength of the angle of the box body 1 and makes the angle of the box body 1 not easy to be damaged. In addition, the inner surface of the box body 1 in the present application does not contain the cross section of the cardboard, thereby improving the leak-proof performance of the box body 1. The plastic part 2 wraps the edge of the box body 1, thereby improving the structural strength of the edge of the box body 1 and preventing the edge of the box body from deforming. Furthermore, the arrangement of the plastic part facilitates the box cover to be closed on the box body to seal it.

[0026] See also Figure 2-3 As shown, further, the first triangular plate 131 and the third triangular plate 133 are right triangles symmetrically arranged on both sides of the second triangular plate 132, and the second triangular plate 132 is an isosceles triangle. After the box body 1 is formed, one side edge of the first triangular plate 131 and the third triangular plate 133 are aligned with the vertical foot line of the second triangular plate 132, so that the adjacent side panels 12 are connected, avoiding that the joint seam between the adjacent side panels 12 is too large to affect the overall aesthetics of the box body 1.

[0027] Furthermore, the hypotenuses of the first triangular plate 131 and the third triangular plate 133 are equal in length to the side lengths of the second triangular plate 132. After the box body 1 is formed, the top ends of the first triangular plate 131, the second triangular plate 132 and the third triangular plate 133 are flush, so that the second triangular plate 132 overlaps with the combined structure of the first triangular plate 131 and the third triangular plate 133.

[0028] For further information, see Figure 3-4As shown, after the box body 1 is formed, the heights of the first triangular plate 131, the second triangular plate 132 and the third triangular plate 133 are less than the height of the side plate 12, so that the top surface of the second triangular plate 132 is lower than the edge end surface of the box body 1 to form an avoidance step 14. The plastic part 2 includes an integrally formed plastic part body 21 and an edge-wrapped plastic part 22, and a step surface 23 is provided between the plastic part body 21 and the edge-wrapped plastic part 22. When installing the plastic part 2, the box body 1 is placed in an injection mold, and the molten plastic stock liquid is poured into the mold and bonded to the box body 1 to form the plastic part 2. The molded plastic part body 21 is bonded to the inner surface of the side plate 12 around the edge, and the edge-wrapped plastic part 22 is bonded to the top of the inner surface of the second triangular plate 132, and the step surface 23 is bonded to the avoidance step 14. The plastic component main body 21 wraps a one-layer structure formed by only the side panel 12, and the edging plastic component 22 wraps a three-layer structure formed by folding the side panel 12 and the sealing connecting plate 13, thereby improving the firmness of the bonding between the plastic component 2 and the box body 1 and avoiding the transition between the three-layer structure and the one-layer structure affecting the combination of the plastic component 2 and the box body 1.

[0029] See also Figure 5-6 As shown, the cross section of the plastic body 21 is generally U-shaped, including a sealing plate 211 located above the edge end surface, and a first folded edge 212 and a second folded edge 213 respectively arranged at the two side edges of the lower end of the sealing plate 211. The sealing plate 211 partially extends to the outside of the box body 1, so that there is a gap between the second folded edge 213 and the side plate 12. The first folded edge 212 is bonded to the inner surface of the side plate 12 and is integrally formed with the edging plastic part 22. The plastic body 21 can be used to match the box cover to seal the box body 1, and the box cover can be snap-connected with the second folded edge 213 to achieve fixation.

[0030] Furthermore, the bottom end surface of the first folded edge 212 is the above-mentioned step surface 23, and the edging plastic part 22 is integrally formed on the outer surface of the first folded edge 212 and partially extends to the bottom of the first folded edge 212, so that the thickness of the first folded edge 212 does not need to exceed the thickness of the first triangular plate 131 and the second triangular plate 132 after folding, thereby reducing the amount of plastic used in the first folded edge 212 and reducing the overall weight of the three-dimensional box.

[0031] The paperboard is preferably made of cardboard with only a film on the inside, and the material of the film can be PP or PBS, so that the inner surface of the box body 1 has oil and water resistance and the plastic part 2 and the box body 1 can be firmly bonded without applying glue, thereby improving the production efficiency of the three-dimensional box. When the first triangular plate 131, the third triangular plate 133 and the second triangular plate 132 are bonded, a weldable varnish (such as water-based ultrasonic varnish) can be applied on the outer surface of the second triangular plate 132 to avoid gluing.

[0032] In one embodiment, the paper box is a square box with rounded corners (such as Figure 1 ).

[0033] In one embodiment, the paper box is a square box with sharp corners (such as Figure 7 ).

[0034] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A butterfly inner folding paper box formed by combining paper and plastic, comprising a box body and a circle of plastic parts wrapped around the edge of the box body, the box body is folded from a flat cardboard, the cardboard comprises a bottom plate for forming the bottom of the box and a box body connected around the edge of the bottom plate, the box body comprises a plurality of side panels and a foldable sealing connecting plate that seamlessly connects adjacent side panels, two folding lines are arranged on the sealing connecting plate to divide it into a first triangular plate, a second triangular plate and a third triangular plate, the first triangular plate and the third triangular plate are respectively located on both sides of the second triangular plate and are respectively connected to one of the side panels, when the paper box is formed, the first triangular plate and the third triangular plate are both folded outwards and connected to the outer surface of the second triangular plate, the inner surfaces of the first triangular plate and the third triangular plate are respectively connected to the inner surfaces of the adjacent side panels, characterized in that After the box body is formed, the top end surfaces of the first triangular plate, the second triangular plate and the third triangular plate are lower than the edge end surface of the box body to form an avoidance step, and the plastic part includes a plastic part body bonded to the inner surface of the side panel and a edging plastic part bonded to the top of the inner surface of the second triangular plate, and a step surface bonded to the avoidance step is provided between the plastic part body and the edging plastic part.

2. The inner folding paper box according to claim 1, characterized in that: After the paper box is formed, the adjacent side panels are butt-jointed.

3. The inner folding paper box according to claim 1, characterized in that: After the paper box is formed, the top ends of the first triangular plate, the second triangular plate and the third triangular plate are flush.

4. The inner folding paper box according to claim 1, characterized in that: The main body of the plastic part includes a sealing plate and a first folded edge and a second folded edge respectively arranged on the two side edges of the lower end of the sealing plate. The sealing plate is located above the edge end surface of the box body and partially extends to the outside of the box body. The first folded edge is bonded to the inner surface of the side panel and is integrally formed with the edging plastic part. There is a distance between the second folded edge and the side panel.

5. The inner folding paper box according to claim 4, characterized in that: The bottom end surface of the first folded edge is the step surface, and the edging plastic part is integrally formed on the outer surface of the first folded edge and partially extends to the bottom of the first folded edge.

6. The inner folding paper box according to claim 1, characterized in that: The paperboard is made of cardboard with inner side coated or laminated film.

7. The inner folding paper box according to claim 1, characterized in that: The box body is a square box with rounded corners.

8. The inner folding paper box according to claim 1, characterized in that: The box body is a square box with pointed corners.

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