Paper cup

Abstract

The invention provides a paper cup, and belongs to the technical field of paper containers. The sealing performance of the joint of the paper cup is guaranteed, meanwhile, the paper cup manufacturing efficiency can be improved, and the paper cup manufacturing cost can be reduced. According to the paper cup, an inner cup layer is provided with a folding area formed by bending a first end of the inner cup layer towards the outer side of the inner cup layer, a waterproof film comprises a second end of the waterproof film and a first end of the waterproof film, the thickness of the folding area is equal to that of the inner cup layer, an outer cup layer is further arranged on the outer side face of the inner cup layer, and an adjacent edge on the outer cup layer is in butt joint or lap joint with the outer edge of the folding area. The second end of the inner cup layer, the second end of the outer cup layer and the outer side face of the folding area are connected to form a cup body, the second end of the inner cup layer is located on the outer side of the adjacent edge, and the first end of the waterproof film is fixed to the second end of the waterproof film and the second end of the outer cup layer. According to the scheme, the inner cup layer does not need to be trimmed, the sealing performance of the joints of the paper cup is guaranteed, meanwhile, the manufacturing efficiency of the paper cup can be improved, and the manufacturing cost of the paper cup is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of paper containers, such as paper cups and paper bowls, and particularly relates to a paper cup. Background Art

[0002] Paper cups are easy to use and are generally used to hold liquids such as water, coffee, and milk. Some paper cups are now also used to hold alcohol. Some paper cups are enlarged and used as packaging boxes to hold soups, making it convenient to carry liquids or solid-liquid mixtures. In addition, paper cups have the advantages of low cost, portability, and safety over glass cups. Paper cups have the advantages of high temperature resistance and no pollution over plastic cups. Therefore, paper cups have a very wide range of applications.

[0003] The method for making a paper cup is as follows: a layer of waterproof film is applied to the inner side of a fan-shaped paper, and the two end edges of the fan-shaped paper are staggered and joined to form a cylindrical shape, and a folded portion folded inward is formed at the lower end opening edge, and a flange portion curled outward is formed at the upper end opening edge. In the process of staggering and joining the two end edges of the fan-shaped paper, at the staggered joint of the two end edges, the inner side of one end of the paper overlaps the outer side of the other end of the paper. Since the outer side of the paper is not coated with a waterproof film, the joint is not firmly bonded, so that the liquid in the paper cup may leak out from the bonding of the two end edges.

[0004] In order to solve the above technical problems, the prior art extends the waterproof film at one end of the paper cup so that the waterproof film is slightly longer than the paper cup as a whole. When the paper cups are staggered and joined, the end of the waterproof film that exceeds the paper cup is located inside the paper cup, so that the side wall joint gap can be completely covered with a layer of waterproof film, so that the joint is completely isolated from the liquid inside, and the possibility of leakage at the joint is blocked. The waterproof film is thin and is easily deformed during the paper cup molding process, making the paper cup molding inconvenient.

[0005] There is another solution to the above technical problem in the prior art, a paper cup with an impermeable structure, the paper cup includes a composite wrapping paper, the composite wrapping paper is composed of PE layer I, paper, and PE layer II, one side of the composite wrapping paper is a folded edge formed by removing half the thickness of the composite wrapping paper (to facilitate folding at the seam to form a flange and a folded back portion), the outer side of the folded edge is a burr, after the folded edge is folded, the burr is bonded to the PE layer I to form a wrapping paper with a folded edge, and the wrapping paper with a folded edge is overlapped and bonded to form a paper cup body. By folding the overlapped surface, liquid leakage is prevented, and the cross section is prevented from contacting with food, which is safer and more hygienic.

[0006] In the above scheme, an additional trimming device is required to remove half of the composite packaging paper. However, during the removal process of the composite packaging paper, the cutter in the trimming device is easily damaged, making paper cup molding more troublesome and increasing costs. Summary of the invention

[0007] The purpose of the present invention is to solve the above problems in the prior art and to propose a paper cup. The technical problem to be solved by the present invention is: how to improve the efficiency of paper cup production and reduce the production cost while ensuring the sealing of the paper cup seams.

[0008] The objective of the present invention can be achieved through the following technical solutions: a paper cup, comprising an inner cup layer, a waterproof film is provided on the inner side surface of the inner cup layer, a folding area is provided on the inner cup layer formed by bending the first end of the inner cup layer toward the outside of the inner cup layer, the waterproof film comprises a second end of the waterproof film located on the outer side surface of the folding area and a first end of the waterproof film located on the inner side surface of the second end of the inner cup layer, characterized in that the thickness of the folding area is equal to the thickness of the inner cup layer, an outer cup layer is further provided on the outer side surface of the inner cup layer, the adjacent edge on the outer cup layer is connected or overlapped with the outer edge of the folding area, the second end of the inner cup layer and the second end of the outer cup layer and the outer side surface of the folding area are connected to form a cup body, the second end of the inner cup layer is located on the outside of the adjacent edge, and the first end of the waterproof film is fixed to the second end of the waterproof film and the second end of the outer cup layer.

[0009] In this solution, since a waterproof film is provided on the inner side of the inner cup layer, and the first end of the inner cup layer is bent toward the outer side to form a folding area, a waterproof film is also provided on the outer side of the folding area, and a waterproof film is also provided on the inner side of the second end of the inner cup layer. When the second end of the inner cup layer is fixed to the outer side of the folding area, the first end of the waterproof film and the second end of the waterproof film and the second end of the outer cup layer are adhered to each other to prevent water from seeping out from the joint and improve the sealing of the paper cup joint. The outer cup layer is provided to reduce the drop between the folding area and the outer side of the inner cup layer, so that the second end of the waterproof film is better attached to the second end of the waterproof film and the second end of the outer cup layer. The first end of the waterproof film is simultaneously fixed to two parts of the cup body, namely the second end of the waterproof film and the second end of the outer cup layer, so that the paper cup joint is more secure. In the paper cup of this solution, the inner cup layer does not need to be trimmed, which can improve the efficiency of paper cup production and reduce the production cost of paper cups while ensuring the sealing of the paper cup joints.

[0010] In the above-mentioned paper cup, when the adjacent edge is in contact with the outer edge, the adjacent edge abuts against the outer edge or there is a gap between the adjacent edge and the outer edge. When the paper cup is formed, the adjacent edge abuts against the outer edge. After the paper cup is formed, the first end of the waterproof film and the second end of the waterproof film are integrated, which improves the sealing effect of the paper cup and makes the seam of the paper cup more firm.

[0011] In the above-mentioned paper cup, the upper ends of the inner cup layer, the folding area and the outer cup layer are rolled outward to form a rolled mouth. The first end of the waterproof film is fixed to the second end of the waterproof film and the second end of the outer cup layer, so that the inner cup layer, the folding area and the second end of the outer cup layer are fixed more tightly. When the upper end of the paper cup is rolled outward, the second end of the outer cup layer is not easy to fall off from the inner cup layer, so that the rolled mouth of the paper cup is more secure.

[0012] In the above-mentioned paper cup, the outer cup layer and the folding area are both bonded to the outer side of the inner cup layer.

[0013] In the above-mentioned paper cup, the outer cup layer includes a first outer cup layer and a second outer cup layer, the second outer cup layer is located outside the first outer cup layer, and the first end of the waterproof membrane is fixed to the second end of the waterproof membrane and the first end of the second outer cup layer.

[0014] In the above-mentioned paper cup, the first end of the first outer cup layer includes a first adjacent edge, the first adjacent edge is opposite to and abuts against the outer edge, the first end of the second outer cup layer includes a second adjacent edge, the second adjacent edge overlaps the outer edge, and the second adjacent edge is located outside the folding area and between the outer edge and the folded edge.

[0015] The first end of the second outer cup layer is located outside the first end of the first outer cup layer and the folded portion, which reduces the possibility of the first adjacent edge and the outer edge falling off from the outer side of the inner cup layer when the paper cup is curled. The second end of the second outer cup layer is clamped between the first end and the second end of the waterproof film to form a double-sided seal, so that the paper cup has a better sealing effect at the seam.

[0016] In the above-mentioned paper cup, the first end of the first outer cup layer includes a first adjacent edge, the first adjacent edge is opposite to the outer edge and is spaced apart from the outer edge, the first end of the second outer cup layer includes a second adjacent edge, the second adjacent edge overlaps the outer edge, and the second adjacent edge is located outside the folding area and between the outer edge and the folded edge.

[0017] In the above-mentioned paper cup, the second end of the inner cup layer extends to the outside of the first adjacent edge. The outside here refers to the radial direction of the paper cup, and the second end of the inner cup layer does not contact the first adjacent edge.

[0018] In the above-mentioned paper cup, the edge of the second end of the inner cup layer is located between the outer edge and the folded edge.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. In the paper cup, the adjacent edge is in contact with the outer edge, and the first end of the waterproof film and the second end of the waterproof film are integrated, which improves the sealing effect of the paper cup and makes the seam of the paper cup more firm. The inner cup layer does not need to be trimmed, which ensures the sealing of the seam of the paper cup and improves the efficiency of paper cup production and reduces the production cost of the paper cup.

[0021] 2. The first end of the waterproof film is fixed to the second end of the waterproof film and the second end of the outer cup layer, so that the inner cup layer, the folding area and the second end of the outer cup layer are fixed more tightly. When the upper end of the paper cup is rolled outward, the second end of the outer cup layer is not easy to fall off from the inner cup layer, making the rolled edge of the paper cup more secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the paper cup of the present invention when it is unfolded;

[0024] Figure 3 It is a vertical cross-sectional schematic diagram of the present invention;

[0025] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure of part A;

[0026] Figure 5 yes Figure 3 A schematic diagram of the enlarged structure of part B;

[0027] Figure 6 is a transverse cross-sectional schematic diagram of the present invention;

[0028] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of part C.

[0029] Figure 8 It is a schematic cross-sectional view of a paper cup in the second embodiment of the present invention.

[0030] Fig. 9 It is a schematic cross-sectional view of a paper cup in Embodiment 3 of the present invention.

[0031] In the figure, 1, paper cup; 2, inner cup layer; 2a, first end of inner cup layer; 2b, second end of inner cup layer; 3, outer cup layer; 3a, first end of outer cup layer; 3b, second end of outer cup layer; 3c, adjacent edge; 4, folding layer; 4a, outer edge; 4b, folded edge; 5, cup body; 6, rolled mouth; 7, cup bottom; 7a, cup bottom foot; 8, waterproof membrane; 8a, first end of waterproof membrane; 8b, second end of waterproof membrane; 9, first outer cup layer; 9a, first end of first outer cup layer; 9b, second end of first outer cup layer; 9c, first adjacent edge; 10, second outer cup layer; 10a, first end of second outer cup layer; 10b, second end of second outer cup layer; 10c, second adjacent edge. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] Embodiment 1

[0034] like Figure 1 , Figure 2 Combined with Figure 6 and Figure 7 As shown, in this embodiment, the paper cup 1 as a whole presents a hollow expanded cup body 5 structure, the cup body 5 is formed by bending a fan-shaped paper, the fan-shaped paper as a whole is a double-layer structure, mainly including an inner cup layer 2 and an outer cup layer 3, and the thickness of the paper is generally 50g / m 2 -350g / m 2 In this embodiment, the thickness of the inner cup layer and the outer cup layer is 150g / m 2 The paper thickness of the inner cup layer and the outer cup layer can also be different. The double-layer paper cup 1 has a scalding-proof effect, and the paper cup 1 feels thicker when used, and the use experience is better.

[0035] The outer cup layer 3 is fixedly arranged on the outer side of the inner cup layer 2, and a waterproof film 8 is arranged on the inner side of the inner cup layer 2. The waterproof film 8 prevents the liquid in the paper cup 1 from directly contacting the inner cup layer 2 and soaking the inner cup layer 2, thereby preventing the liquid from leaking from the paper cup 1. The first end 2a of the inner cup layer is directly folded outward along the folded edge 4b ​​to form a folded layer 4, and the thickness of the folded layer 4 is equal to the thickness of the first end 2a of the inner cup layer. The inner side of the folded layer 4 is fixed on the outer side of the inner cup layer 2, and the outer side of the folded layer 4 is the second end 8b of the waterproof film. The outermost edge of the folded layer 4 is the outer edge 4a. In this embodiment, the adjacent edge 3c of the first end 3a of the outer cup layer is in contact with the outer edge 4a of the folded layer 4, and the "abutment" here means that the first end 3a of the outer cup layer and the outer edge 4a of the folded layer 4 are in contact, but not overlapping. As an alternative, there may be a gap between the adjacent edge 3c and the outer edge 4a. The second end 3b of the outer cup layer is flush with the second end 2b of the inner cup layer.

[0036] The outer cup layer 3 and the folding area 4 are both bonded to the outer side of the inner cup layer 2. The inner cup layer 2 is bent, and the inner side surface of the second end 2b of the inner cup layer and the outer side surface of the folding layer 4 and the first end 3a of the outer cup layer are fixedly connected to form a seam. Ultrasonic heating is used to heat the seam, and the second end of the waterproof film is melted and fixed on the first end 3a of the outer cup layer. At the same time, the first end 8a of the waterproof film and the second end 8b of the waterproof film are integrated. After the waterproof film at the seam is cooled, the cup body is formed. The liquid in the paper cup 1 is not easy to leak out from the above-mentioned seam, and the first end 8a of the waterproof film is integrated after being fixed with the second end 8b of the waterproof film, which improves the sealing effect of the paper cup and makes the seam of the paper cup more firm. The inner cup layer does not need to be trimmed, which can improve the efficiency of paper cup production and reduce the production cost of paper cups while ensuring the sealing of the seam of the paper cup.

[0037] like Figure 3 Combination Figure 2 , Figure 4 and Figure 5 As shown, the top of the paper cup 1 is provided with a rolled mouth 6 and a cup bottom 7. The rolled mouth 6 is formed by the upper part of the inner cup layer 2 being rolled outward after the cup body 5 is bent into a hollow flared shape, and the folded layer 4 and the outer cup layer 3 on the outer side of the inner cup layer 2 are also rolled outward with the inner cup layer 2 to form the rolled mouth 6. The cup bottom 7 and the cup body 5 of the paper cup 1 are split structures, and the installation process of the cup bottom 7 and the cup body 5 is mainly as follows: after the cup body 5 is bent into a hollow flared shape, the part of the paper located at the lower part of the inner cup layer 2 is bent inward, and the folded layer 4 and the outer cup layer 3 on the outer side of the inner cup layer 2 are also bent inward with the inner cup layer 2, and the cup walls of the inner cup layer 2 and the cup body 5 form a groove, and the cup bottom feet 7a on both sides of the cup bottom 7 are inserted into the groove and fixed, so that the cup bottom 7 and the cup body 5 are fixedly connected.

[0038] Embodiment 2

[0039] like Figure 8 As shown, the structure of this embodiment is basically the same as that of the first embodiment. In this embodiment, the outer cup layer includes a first outer cup layer 9 and a second outer cup layer 10. The second outer cup layer 10 is located outside the first outer cup layer 9, and the transverse length of the second outer cup layer 10 is greater than the length of the first outer cup layer. The first end 8a of the waterproof membrane is fixed to the second end 8b of the waterproof membrane and the first end 10a of the second outer cup layer. The first end 9a of the first outer cup layer includes a first adjacent edge 9c, which is opposite to and in contact with the outer edge 4a. As an alternative, the first adjacent edge 9c is opposite to and spaced from the outer edge 4a. The first end 10a of the second outer cup layer includes a second adjacent edge 10c, which overlaps the outer edge 4a. The second adjacent edge 10c is located outside the folding area 4 and between the outer edge 4a and the folded edge 4b. The edge of the second end 2b of the inner cup layer is located between the outer edge 4a and the folded edge 4b.

[0040] Embodiment 3

[0041] like Fig. 9 As shown, the structure of the third embodiment is basically the same as that of the second embodiment, the only difference is that the second end 2b of the inner cup layer extends to the outside of the first adjacent edge 9c, where the outside refers to the outside in the diameter direction of the paper cup, and the second end 2b of the inner cup layer does not directly contact the first adjacent edge 9c.

[0042] The "first end" and "second end" in the present invention refer to the side edges of each layer in the paper cup extending inwardly by a certain distance.

[0043] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0044] Although the terms 1, paper cup; 2, inner cup layer; 2a, first end of inner cup layer; 2b, second end of inner cup layer; 3, outer cup layer; 4, folded layer; 4a, outer edge; 4b, folded edge; 5, cup body; 6, rolled mouth; 7, cup bottom; 7a, cup bottom foot; 8, waterproof membrane; 8a, first end of waterproof membrane; 8b, second end of waterproof membrane are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A paper cup, comprising an inner cup layer (2), a waterproof film (8) being provided on the inner side of the inner cup layer (2), a folding area (4) being formed by bending a first end (2a) of the inner cup layer toward the outside of the inner cup layer (2) on the inner cup layer (2), the waterproof film (8) comprising a second end (8b) of the waterproof film located on the outer side of the folding area (4) and a first end (8a) of the waterproof film located on the inner side of the second end (2b) of the inner cup layer, characterized in that: The thickness of the folding area (4) is equal to the thickness of the inner cup layer (2); the outer side surface of the inner cup layer (2) is also provided with an outer cup layer (3); the adjacent edge (3c) on the outer cup layer (3) is connected or overlapped with the outer edge (4a) of the folding area (4); the second end (2b) of the inner cup layer and the second end (3b) of the outer cup layer and the outer side surface of the folding area (4) are connected to form a cup body; the second end (2b) of the inner cup layer is located outside the adjacent edge (3c); and the first end (8a) of the waterproof membrane is fixed to the second end (8b) of the waterproof membrane and the second end (3b) of the outer cup layer.

2. A paper cup according to claim 1, characterized in that: When the adjacent edge (3c) is in contact with the outer edge (4a), the adjacent edge (3c) and the outer edge (4a) are in contact with each other or there is a gap between the adjacent edge (3c) and the outer edge (4a).

3. A paper cup according to claim 2, characterized in that: The upper ends of the inner cup layer (2), the folding area (4) and the outer cup layer (3) are rolled outward to form a rolled opening (6).

4. A paper cup according to claim 3, characterized in that: The outer cup layer (3) and the folding area (4) are both bonded to the outer side of the inner cup layer (2).

5. A paper cup according to claim 1, characterized in that: The outer cup layer comprises a first outer cup layer (9) and a second outer cup layer (10), wherein the second outer cup layer (10) is located outside the first outer cup layer (9), and the first end (8a) of the waterproof membrane is fixed to the second end (8b) of the waterproof membrane and the first end (10a) of the second outer cup layer.

6. A paper cup according to claim 5, characterized in that: The first end (9a) of the first outer cup layer includes a first adjacent edge (9c), and the first adjacent edge (9c) is opposite to and abuts against the outer edge (4a). The first end (9a) of the second outer cup layer includes a second adjacent edge (10c), and the second adjacent edge (10c) overlaps with the outer edge (4a). The second adjacent edge (4a) is located outside the folding area (4) and between the outer edge (4a) and the folded edge (4b).

7. A paper cup according to claim 5, characterized in that: The first end (9a) of the first outer cup layer includes a first adjacent edge (9c), the first adjacent edge (9c) is adjacent to the outer edge (4a) and is spaced apart from the outer edge (4a), the first end (10a) of the second outer cup layer includes a second adjacent edge (10c), the second adjacent edge (10c) overlaps the outer edge (4a), and the second adjacent edge (10c) is located outside the folding area (4) and between the outer edge (4a) and the folded edge (4b).

8. A paper cup according to claim 6 or 7, characterized in that: The second end (4b) of the inner cup layer extends to the outside of the first adjacent edge (9c).

9. A paper cup according to claim 6 or 7, characterized in that: The edge of the second end (4b) of the inner cup layer is located between the outer edge (4a) and the folded edge (4b).

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