Paper cup

Abstract

The present invention belongs to the technical field of paper containers, and provides a paper cup to solve the problem of how to improve the production efficiency of paper cups and reduce the production costs of the paper cups while ensuring the sealing performance of paper cup seams. In the present paper cup, an inner cup layer is provided with a folding area formed by bending from an inner cup layer first end to the outer side of the inner cup layer; a waterproof film comprises a waterproof film second end and a waterproof film first end; the thickness of the folding area is equal to the thickness of the inner cup layer; the outer side surface of the inner cup layer is further provided with an outer cup layer; an adjoining edge on the outer cup layer connects to or overlaps the outer edge of the folding area; an inner cup layer second end, an outer cup layer second end and the outer side surface of the folding area are connected to form a cup body; the inner cup layer second end is located on the outer side of the adjoining edge; the waterproof film first end is fixed on the waterproof film second end and the outer cup layer second end. In the present solution, there is no need to cut the edge of the inner cup layer, thereby improving the production efficiency of the paper cups and reducing the production costs of the paper cups while ensuring the sealing performance of the paper cup seams.

Description

A paper cup TECHNICAL FIELD

[0001] The present application belongs to the technical field of paper containers, such as paper cups and paper bowls, and particularly relates to a paper cup. BACKGROUND

[0002] A paper cup is convenient to use and is generally used to hold liquids such as water, coffee, and milk. Some paper cups are now also used to hold alcohol, and some paper cups, which are enlarged in size, are used as packing boxes to hold soup water, thereby facilitating the carrying of liquids or solid-liquid mixtures. In addition, paper cups have the advantages of low cost, portability, and safety compared with glass cups, and the advantages of heat resistance and no pollution compared with plastic cups, so the application range of paper cups is very wide.

[0003] The manufacturing method of a paper cup is as follows: the inner side of a fan-shaped paper is coated with a layer of waterproof film, the two end edge portions of the fan-shaped paper are staggered and joined to form a cylindrical shape, and a folding portion that folds inward is formed at the lower end opening edge portion, and a flange portion that curls outward is formed at the upper end opening edge portion. During the process of staggering and joining the two end edge portions of the fan-shaped paper, the inner side of one end of the paper overlaps the outer side of the other end at the staggered joint of the two end edge portions. Since the outer side of the paper is not coated with a waterproof film, the joint is not firmly bonded, and the liquid in the paper cup may leak out of the joint between the two end edge portions.

[0004] In order to solve the above technical problems in the prior art, the waterproof film is extended to one end of the paper cup, so that the waterproof film is slightly longer than the paper cup as a whole. When the paper cup is staggered and joined, the end of the waterproof film that exceeds the paper cup is located on the inner side of the paper cup. In this way, a layer of waterproof film is completely bonded at the joint gap of the side wall, so that the joint gap is completely isolated from the liquid inside, and the possibility of leakage at the joint gap is eliminated. The thickness of the waterproof film is small, and deformation easily occurs during the forming of the paper cup, making it inconvenient to form the paper cup.

[0005] Another solution to the above technical problem in the prior art is a paper cup with an anti-leak structure. The paper cup comprises a composite packaging paper, which is composed of a PE layer I, paper, and a PE layer II. One side of the composite packaging paper is a folded edge formed by removing half of the paper thickness of the composite packaging paper (in order to facilitate the folding of the joint to form a flange portion and a folding portion). The outer side of the folded edge is a rough edge. After the folded edge is folded, the rough edge is bonded with the PE layer I to form a packaging paper with a folded edge. The packaging paper with the folded edge is bonded by overlapping to form a paper cup body. By treating the overlapping surface as a folded edge, liquid leakage is prevented, and the cross section is prevented from contacting food, thereby being safer and more sanitary.

[0006] In the above scheme, the composite wrapping paper needs to be additionally provided with a pin edge device to remove half of the paper thickness, but in the composite wrapping paper removing process, the cutter in the edge cutting device is prone to damage, which makes the paper cup forming more troublesome and increases the cost. SUMMARY

[0007] The present application aims to solve the above problems of the prior art, and provides a paper cup.

[0008] The present application can be achieved by the following technical scheme: a paper cup comprises an inner cup layer, the inner side of the inner cup layer is provided with a waterproof film, the inner cup layer is provided with a folding area formed by bending the first end of the inner cup layer towards the outer side of the inner cup layer, the waterproof film comprises a second end of the waterproof film located on the outer side of the folding area and a first end of the waterproof film located on the inner side 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, the outer side of the inner cup layer is further provided with an outer cup layer, the abutting edge on the outer cup layer is connected 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 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 abutting edge, and the first end of the waterproof film is fixed on the second end of the waterproof film and the second end of the outer cup layer.

[0009] In the present application, the inner side of the inner cup layer is provided with a waterproof film, the first end of the inner cup layer is bent towards the outer side to form a folding area, therefore, the outer side of the folding area is also provided with a waterproof film, the inner side of the second end of the inner cup layer is also provided with a waterproof film, when the second end of the inner cup layer is fixed on 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 mutually adhered, which avoids water from seeping out of the joint, improves the sealing performance of the joint of the paper cup, and sets the outer cup layer to reduce the difference 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 fixed on two parts of the cup body, i.e., the second end of the waterproof film and the second end of the outer cup layer, and the joint of the paper cup is more firm. In the present application, the inner cup layer does not need to be cut, which can improve the efficiency of paper cup production and reduce the production cost of the paper cup while ensuring the sealing performance of the joint of the paper cup.

[0010] In the above paper cup, when the abutting edge is connected with the outer edge, the abutting edge is connected with the outer edge or there is a gap between the abutting edge and the outer edge. When the paper cup is formed, the abutting edge is connected with the outer edge, after the paper cup is formed, the first end of the waterproof film and the second end of the waterproof film form an integral part, which improves the sealing effect of the paper cup and makes the joint of the paper cup more firm.

[0011] In the paper cup, the upper end of the inner cup layer, the folding area and the outer cup layer are outwardly rolled to form a rolled mouth.

[0012] In the paper cup, the outer cup layer and the folding area are adhered to the outer side of the inner cup layer.

[0013] In the paper cup, the outer cup layer comprises 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 film is fixed on the second end of the waterproof film and the first end of the second outer cup layer.

[0014] In the paper cup, the first end of the first outer cup layer comprises a first abutting edge, the first abutting edge is in abutment with the outer edge and is in abutment with the outer edge, the first end of the second outer cup layer comprises a second abutting edge, the second abutting edge is in abutment with the outer edge, and the second abutting edge is located outside the folding area and between the outer edge and the folding 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 folding part, which reduces the separation of the first abutting edge and the outer edge from the outer side of the inner cup layer when the paper cup is rolled, and the second end of the second outer cup layer is clamped between the first end of the waterproof film and the second end of the waterproof film to form a double-sided seal, so that the sealing effect of the paper cup at the joint is better.

[0016] In the paper cup, the first end of the first outer cup layer comprises a first abutting edge, the first abutting edge is in abutment with the outer edge and is in abutment with the outer edge, the first end of the second outer cup layer comprises a second abutting edge, the second abutting edge is in abutment with the outer edge, and the second abutting edge is located outside the folding area and between the outer edge and the folding edge.

[0017] In the paper cup, the second end of the inner cup layer extends to the outside of the first abutting 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 abutting edge.

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

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

[0020] 1. In this paper cup, the adjacent edges abut against the outer edge, and the first and second ends of the waterproof membrane are integrated, which improves the sealing effect of the paper cup and makes the seams of the paper cup more secure. The inner cup layer does not need to be cut. While ensuring the sealing of the seams of the paper cup, it can also improve the efficiency of paper cup production and reduce the production cost of paper cup.

[0021] 2. 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, making the inner cup layer, the folding area and the second end of the outer cup layer more tightly fixed. When the top of the paper cup is rolled outward, the second end of the outer cup layer is not easy to fall off the inner cup layer, making the rolled edge of the paper cup more secure. Attached Figure Description

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

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

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

[0025] Figure 4 is an enlarged structural diagram of part A in Figure 3;

[0026] Figure 5 is an enlarged structural diagram of part B in Figure 3;

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

[0028] Figure 7 is an enlarged structural diagram of part C in Figure 6.

[0029] Figure 8 is a schematic diagram of the transverse cross-section of the paper cup in Embodiment 2 of the present invention.

[0030] Figure 9 is a schematic diagram of the transverse cross-section of the paper cup in Embodiment 3 of the present invention.

[0031] In the diagram, 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. Folded layer; 4a. Outer edge; 4b. Folded edge; 5. Cup body; 6. Rolled rim; 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 Implementation

[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example

[0033] As shown in FIG. 1, FIG. 2, and in combination with FIG. 6 and FIG. 7, in the embodiment, the paper cup 1 has a hollow flared cup body 5 structure as a whole, the cup body 5 is formed by folding a fan-shaped paper, the fan-shaped paper has a double-layer structure as a whole, mainly including an inner cup layer 2 and an outer cup layer 3, and the thickness of the paper is generally 50 g / m 2 -350 g / m 2 In the embodiment, the thickness of the inner cup layer and the outer cup layer is 150 g / m 2 The thickness of the inner cup layer and the outer cup layer can also be different. The double-layer paper cup 1 plays a role of preventing scalding, and the paper cup 1 has a more substantial hand feeling when used, and the use experience is better.

[0034] 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 avoids the liquid in the paper cup 1 from directly contacting and wetting the inner cup layer 2, and avoids the liquid from leaking from the paper cup 1. The inner cup layer first end 2a is directly folded outward along the folding edge 4b to form a folding layer 4, and the thickness of the folding layer 4 is equal to the thickness of the inner cup layer first end 2a. The inner side of the folding layer 4 is fixedly arranged on the outer side of the inner cup layer 2, and the outer side of the folding layer 4 is provided with a waterproof film second end 8b. The outermost edge of the folding layer 4 is an outer edge 4a. In the embodiment, the abutting edge 3c of the outer cup layer first end 3a abuts against the outer edge 4a of the folding layer 4. Here, “abutting against” means that the outer cup layer first end 3a and the outer edge 4a of the folding layer 4 are in contact, but not overlapped. As an alternative, there can be a gap between the abutting edge 3c and the outer edge 4a. The outer cup layer second end 3b is flush with the inner cup layer second end 2b.

[0035] The outer cup layer 3 and the folding area 4 are both adhered to the outer side of the inner cup layer 2. The inner cup layer 2 is folded, and the inner side of the inner cup layer second end 2b and the outer side of the folding layer 4 and the outer cup layer first end 3a are fixedly connected to form a joint. The joint is heated by ultrasonic waves, the waterproof film second end is melted and fixed on the outer cup layer first end 3a, at the same time, the waterproof film first end 8a and the waterproof film second end 8b are integrated, and the waterproof film at the joint is cooled to form the cup body, the liquid in the paper cup 1 is not easy to leak out from the joint, and the waterproof film first end 8a is integrated after being fixed with the waterproof film second end 8b, which improves the sealing effect of the paper cup and makes the joint of the paper cup more firm. The inner cup layer does not need to be trimmed, which can improve the efficiency of making the paper cup and reduce the cost of making the paper cup while ensuring the sealing performance of the joint of the paper cup.

[0036] As shown in Fig. 3 in combination with Fig. 2, Fig. 4 and Fig. 5, the upper part of the paper cup 1 is provided with a curled rim 6 and a cup bottom 7. The curled rim 6 is formed by curling the cup body 5 into a hollow flared shape and curling the upper part of the inner cup layer 2 outward, and the folding layer 4 outside the inner cup layer 2 and the outer cup layer 3 are curled outward along with the inner cup layer 2 to form the curled rim 6. The cup bottom 7 and the cup body 5 of the paper cup 1 are in a split structure, and the installation process of the cup bottom 7 and the cup body 5 mainly includes: curling the cup body 5 into a hollow flared shape, curling the lower part of the inner cup layer 2 inward, and curling the folding layer 4 outside the inner cup layer 2 and the outer cup layer 3 inward along with the inner cup layer 2, so that the inner cup layer 2 and the cup wall of 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. Embodiment

[0037] As shown in Fig. 8, the structure of the present embodiment is basically the same as that of Embodiment 1. In the present 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, and the first end 8a of the waterproof film is fixed on the second end 8b of the waterproof film and the first end 10a of the second outer cup layer. The first end 9a of the first outer cup layer includes a first abutting edge 9c, the first abutting edge 9c is in abutment and contact with the outer edge 4a, as an alternative, the first abutting edge 9c is in abutment with the outer edge 4a with a gap. The first end 10a of the second outer cup layer includes a second abutting edge 10c, the second abutting edge 10c is in abutment with the outer edge 4a, the second abutting edge 10c is located outside the folding area 4 and between the outer edge 4a and the folding edge 4b, and the edge of the second end 2b of the inner cup layer is located between the outer edge 4a and the folding edge 4b. Embodiment

[0038] As shown in Fig. 9, the structure of Embodiment 3 is basically the same as that of Embodiment 2, the difference is that the second end 2b of the inner cup layer extends to the outside of the first abutting 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 abutting edge 9c.

[0039] In the present application, the "first end" and the "second end" refer to the side edges of each layer in the paper cup extending inward by a certain distance.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

[0041] 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, folding layer; 4a, outer edge; 4b, folding edge; 5, cup body; 6, rolled edge; 7, cup bottom; 7a, cup bottom foot; 8, waterproof film; 8a, first end of waterproof film; 8b, second end of waterproof film, etc. are used more frequently in this document, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the nature of the present application; any interpretation of them as additional limitations is against the spirit of the present application.

Claims

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

2. A paper cup according to claim 1, characterised in that When the abutting edge (3c) is opposite to the outer edge (4a), the abutting edge (3c) is abutted with the outer edge (4a) or there is a gap between the abutting edge (3c) and the outer edge (4a).

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

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

5. A paper cup according to claim 1, characterised in that 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 on the outer side of the first outer cup layer (9), and the waterproof film first end (8a) is fixed on the waterproof film second end (8b) and the second outer cup layer first end (10a).

6. A paper cup according to claim 5, characterised in that The first outer cup layer first end (9a) includes a first abutting edge (9c), the first abutting edge (9c) is opposite to and abutted with the outer edge (4a), the second outer cup layer first end (9a) includes a second abutting edge (10c), the second abutting edge (10c) is overlapped with the outer edge (4a), and the second abutting edge (4a) is located on the outer side of the folding area (4) and between the outer edge (4a) and the folding edge (4b).

7. A paper cup according to claim 5, characterised in that The first outer cup layer first end (9a) includes a first abutting edge (9c), the first abutting edge (9c) is opposite to and abutted with the outer edge (4a), the second outer cup layer first end (9a) includes a second abutting edge (10c), the second abutting edge (10c) is overlapped with the outer edge (4a), and the second abutting edge (10c) is located on the outer side of the folding area (4) and between the outer edge (4a) and the folding edge (4b).

8. A paper cup according to claim 6 or 7, characterised in that, The inner cup layer second end (4b) extends to the outer side of the first abutting edge (9c).

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

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