Paper cup

Abstract

The utility model 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 utility model 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 takeout boxes for soup, 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. Compared with plastic cups, paper cups have the advantages of high temperature resistance and pollution-free. Therefore, paper cups have a very wide range of applications.

[0003] The paper cup manufacturing method generally involves coating the inner surface of a fan-shaped sheet of paper with a waterproof film. The two ends of the fan-shaped paper are then interlaced and joined to form a cylindrical shape. The lower open edge is formed with an inwardly folded portion, and the upper open edge is formed with an outwardly curled flange. During the interlacing and joining process, the inner surface of one end of the paper overlaps the outer surface of the other end. Because the outer surfaces of the paper are not coated with a waterproof film, the seam is not firmly bonded, potentially allowing liquid in the paper cup to leak out through the bonded edges.

[0004] To address this technical problem, existing technologies extend a waterproof membrane over one end of a paper cup, making it slightly longer than the cup. When the cups are interlaced and joined, the end of the waterproof membrane that extends beyond the cup is located inside the cup. This completely covers the gap between the sidewalls, isolating the gap from the liquid inside and preventing leakage. However, the waterproof membrane is relatively thin and easily deforms during the cup molding process, making it difficult to mold the cup.

[0005] Another solution to the above-mentioned technical problem exists in the prior art. The invention relates to a paper cup with an impermeable structure. The paper cup comprises a composite wrapping paper, which is composed of a PE layer I, paper, and a PE layer II. One side of the composite wrapping paper has a hem formed by removing half the thickness of the composite wrapping paper (to facilitate folding at the seam to form a flange and folded portion). The outer side of the hem is a raw edge. After the hem is folded, the raw edge is bonded to the PE layer I to form the hem-bearing wrapping paper. The hem-bearing wrapping paper is then overlapped and bonded to form the paper cup body. By hemming the overlapping surface, liquid leakage is prevented and the cross-section is prevented from contacting food, making the cup safer and more hygienic.

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

[0007] The purpose of this utility model is to address the above-mentioned problems in the existing technology and propose a paper cup. The technical problem to be solved by this utility model is: how to ensure the sealing of the seams of the paper cup while improving the efficiency of paper cup production and reducing the production cost of the paper cup.

[0008] The objectives of the utility model 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, 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 outside the adjacent edge, and the first end of the waterproof membrane is fixed to the second end of the waterproof membrane and the second end of the outer cup layer.

[0009] In this solution, a waterproof membrane 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 folded area. Therefore, a waterproof membrane is also provided on the outer side of the folded area, and a waterproof membrane 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 folded area, the first end of the waterproof membrane, the second end of the waterproof membrane, and the second end of the outer cup layer adhere to each other, preventing water from seeping through the seam and improving the sealing of the paper cup seam. The provision of the outer cup layer reduces the height difference between the folded area and the outer side of the inner cup layer, allowing the second end of the waterproof membrane to better fit between the second end of the waterproof membrane and the second end of the outer cup layer. The first end of the waterproof membrane is simultaneously fixed to two locations on the cup body: the second end of the waterproof membrane and the second end of the outer cup layer, making the paper cup seam more secure. In this solution, the inner cup layer does not need to be trimmed, which ensures the sealing of the paper cup seam while improving the efficiency and reducing the production cost of the paper cup.

[0010] In the aforementioned paper cup, when the adjacent edge abuts the outer edge, the adjacent edge abuts the outer edge or is spaced apart from the outer edge. During the molding of the paper cup, the adjacent edge abuts the outer edge. After the paper cup is formed, the first end and the second end of the waterproof membrane are integrally formed, thereby improving the sealing effect of the paper cup and making the seam of the paper cup more secure.

[0011] In the aforementioned paper cup, the upper ends of the inner cup layer, folded area, and outer cup layer are curled outward to form a rolled edge. The first end of the waterproof membrane is fixed to the second end of the waterproof membrane and the second end of the outer cup layer, thereby more tightly securing the inner cup layer, folded area, and second end of the outer cup layer. When the upper end of the paper cup is curled outward, the second end of the outer cup layer is less likely to fall off the inner cup layer, thus making the rolled edge of the paper cup 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, thereby preventing the first adjacent edge and the outer edge from falling off from the outer side of the inner cup layer when the paper cup is rolled. The second end of the second outer cup layer is clamped between the first end and the second end of the waterproof membrane to form a double-sided seal, thereby improving the sealing effect of the paper cup 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. Here, the outside 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 utility model has the following advantages:

[0020] 1. In this paper cup, the adjacent edge abuts against the outer edge, and the first end and the second end of the waterproof membrane are integrated, which improves the sealing effect of the paper cup and makes the seam of the paper cup more secure. The inner cup layer does not need to be trimmed, which ensures the sealing of the paper cup seam while improving the efficiency of paper cup production and reducing the production cost of paper cups.

[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 structural diagram of the utility model;

[0023] Figure 2 This is a schematic structural diagram of the paper cup of the utility model when it is unfolded;

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

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

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

[0027] Figure 6 It is a transverse cross-sectional schematic diagram of the utility model;

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

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

[0030] Figure 9 It is a schematic transverse cross-sectional view of a paper cup in a third embodiment 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] Example 1

[0034] like Figure 1 、 Figure 2 and combined Figure 6 and Figure 7 As shown in the embodiment, the paper cup 1 as a whole presents a hollow flared cup body 5 structure, which 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. 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 are both 150g / m 2 The thickness of the paper of the inner cup layer and the outer cup layer can also be different. The double-layer paper cup 1 has the effect of preventing scalding, and the paper cup 1 feels thicker when used, and the use experience is better.

[0035] The outer cup layer 3 is fixed to the outer surface of the inner cup layer 2. A waterproof membrane 8 is provided on the inner surface of the inner cup layer 2. This membrane prevents liquid in the paper cup 1 from directly contacting and soaking the inner cup layer 2, thereby preventing liquid from leaking out of 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. The thickness of the folded layer 4 is equal to the thickness of the first end 2a of the inner cup layer. The inner surface of the folded layer 4 is fixed to the outer surface of the inner cup layer 2, and the second end 8b of the waterproof membrane is located on the outer surface of the folded layer 4. 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 abuts the outer edge 4a of the folded layer 4. "Abutting" here means that the first end 3a of the outer cup layer 3a and the outer edge 4a of the folded layer 4 are in contact but do not overlap. Alternatively, a gap may exist 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 folding region 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 is fixedly connected to the outer side surface of the folding layer 4 and the first end 3a of the outer cup layer to form a seam. Ultrasonic heating is applied to the seam, melting the second end of the waterproof membrane and fixing it to the first end 3a of the outer cup layer. Simultaneously, the first end 8a of the waterproof membrane and the second end 8b of the waterproof membrane are integrated. After the waterproof membrane at the seam cools, the cup body is formed. Liquid in the paper cup 1 is less likely to leak through the seam. Moreover, the first end 8a of the waterproof membrane and the second end 8b of the waterproof membrane are integrated after being fixed, thereby improving the sealing effect of the paper cup and making the seam of the paper cup more secure. The inner cup layer does not need to be trimmed, which ensures the sealing of the paper cup seam while improving the efficiency and reducing the production cost of the paper cup.

[0037] like Figure 3 Combine Figure 2 、 Figure 4 and Figure 5 As shown, the top of the paper cup 1 is provided with a rolled opening 6 and a bottom 7. The rolled opening 6 is formed by rolling outward the portion of the inner cup layer 2 located above the cup body 5 after the cup body 5 is bent into a hollow, flared shape. The folded layer 4 and outer cup layer 3 outside the inner cup layer 2 also roll outward with the inner cup layer 2, forming the rolled opening 6. The bottom 7 and cup body 5 of the paper cup 1 are separate structures. The installation process of the bottom 7 and cup body 5 is as follows: After the cup body 5 is bent into a hollow, flared shape, the portion of paper located below the inner cup layer 2 is bent inward. The folded layer 4 and outer cup layer 3 outside the inner cup layer 2 also fold inward with the inner cup layer 2, forming grooves in the walls of the inner cup layer 2 and cup body 5. The bottom feet 7a on either side of the bottom 7 are inserted into the grooves and fixed, firmly connecting the bottom 7 and cup body 5.

[0038] Example 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 has a transverse length greater than that 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 adjacent to and in contact with the outer edge 4a. Alternatively, the first adjacent edge 9c is adjacent 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] Example 3

[0041] like Figure 9 As shown, the structure of the third embodiment is basically the same as that of the second embodiment, with the only difference being 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 illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0044] Although this document frequently uses terms such as 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 edge; 7. cup bottom; 7a. cup bottom foot; 8. waterproof membrane; 8a. first end of waterproof membrane; 8b. second end of waterproof membrane, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A paper cup, comprising an inner cup layer (2), a waterproof membrane (8) provided on the inner side of the inner cup layer (2), a folding area (4) formed by bending a first end (2a) of the inner cup layer toward the outside of the inner cup layer (2), the waterproof membrane (8) comprising a second end (8b) of the waterproof membrane located on the outer side of the folding area (4) and a first end (8a) of the waterproof membrane 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 further 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); 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 edge (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. The 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), 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 (10a) 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 (10c) 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 (2b) 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 (2b) of the inner cup layer is located between the outer edge (4a) and the folded edge (4b).

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