Edge sealing structure of double-layer paper cup

Abstract

This invention provides a sealing structure for a double-layer paper cup, belonging to the field of paper cup technology. It solves the strength problem of double-layer paper cups. This sealing structure includes an inner cup layer and an outer cup layer. The inner cup layer is thicker than the outer cup layer, and the outer cup layer is bonded to the outer circumferential surface of the inner cup layer. When unfolded, the inner and outer cup layers form a fan shape, with the fan shape length of the inner cup layer being greater than that of the outer cup layer. This ensures that the first end of the outer cup layer does not cover the edge of the first end of the inner cup layer. The edge of the outer cup layer not covered by the first end of the inner cup layer is the sealing area. When the sealing area overlaps the inner side of the inner cup layer and forms a sealed bond, the first end of the outer cup layer, the second end of the outer cup layer, the second end of the inner cup layer, and the first end of the inner cup layer form at least three overlapping sealing areas. The sealing area near the upper edge of the cup is compressed to form a rolled-up area with a thickness less than the other sealing areas. Part of the rolled-up area forms a rolled edge. This solution creates a structure with enhanced strength through the inner sealing and the compressed rolled-up area.

Description

Technical Field

[0001] This invention belongs to the field of paper cup technology, and relates to a double-layer paper cup, and particularly to a sealing structure for a double-layer paper cup. Background Technology

[0002] With increasing environmental awareness, paper cups are becoming more and more popular as an alternative to plastic cups, and have become daily necessities in homes, restaurants, and offices. Beyond basic needs, the demand for personalized paper cups is growing, such as double-layered paper cups requiring heat insulation and anti-scalding properties, and even aesthetically pleasing designs with unique patterns and designs. However, due to manufacturing limitations, existing double-layered insulated paper cups can only be cut into identical fan-shaped sections after the outer and inner layers are laminated. When rolling these sections into the cup body, the edges need to be sealed. Since the paper is laminated together, the sealing process requires overlapping the two layers. This method necessitates that both the inner and outer layers be waterproof to prevent water leakage from the outer edge of the seal.

[0003] The above-mentioned process can perfectly solve the requirements of edge sealing leakage and double-layer heat insulation. However, the outer paper has high requirements. It must be waterproof and adhesive, which greatly limits the range of outer paper to be selected. It also encounters many obstacles when pursuing personalized shapes, patterns and designs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a sealing structure for double-layer paper cups. The technical problem to be solved by this invention is: how to improve the application range of the outer paper of double-layer paper cups while ensuring strength.

[0005] The objective of this invention can be achieved through the following technical solution: a sealing structure for a double-layer paper cup, wherein the double-layer paper cup includes a cup body, the cup body includes an inner cup layer and an outer cup layer, characterized in that the thickness of the inner cup layer is greater than the thickness of the outer cup layer and the outer cup layer is bonded to the outer circumferential surface of the inner cup layer, the inner cup layer and the outer cup layer are unfolded to form a fan shape, the length of the fan shape of the inner cup layer is greater than the length of the fan shape of the outer cup layer, such that the first end of the outer cup layer does not cover the edge of the first end of the inner cup layer, the edge of the outer cup layer not covered by the first end of the inner cup layer is the sealing area, when the sealing area overlaps the inner side of the inner cup layer and forms a sealed bond, the first end of the outer cup layer, the second end of the outer cup layer, the second end of the inner cup layer and the first end of the inner cup layer form at least three layers of sealing area that are in contact with each other, the sealing area near the upper edge of the cup body is squeezed to form a rolled edge area with a thickness less than the other sealing areas, part of the rolled edge area is rolled to form a rolled edge, and the remaining part after squeezing forms the cup wall of the cup body.

[0006] In this design, the double-layered paper cup adopts a double-layer structure with a thicker inner layer and a thinner outer layer, ensuring the cup's rigidity and enhancing its connection strength. The sealing structure uses separate sealing for the inner and outer cup layers, with the inner layer made of waterproof material, ensuring a complete seal and preventing leakage. This eliminates restrictions on the type of paper used for the outer cup layer, allowing for the use of any type of paper for decorative and functional designs, thus expanding its applicability. Furthermore, the second end of the inner cup layer overlaps with or is opposite to the first end of the outer cup layer, creating at least three sealing layers at the sealing location. These multiple sealing layers further strengthen the paper cup, acting as a support beam. Based on this design, the cup rim is compressed to a thickness suitable for existing sealing machines, creating a sealing area that avoids the inability to automatically seal due to the multiple sealing layers. This solves both the sealing and sealing problems.

[0007] In the aforementioned sealing structure of a double-layer paper cup, the outer cup layer is corrugated paper with a corrugated structure or a structure with hollow protrusions. When compressed, the rolled-up area has pleats that strengthen the rolled-up area, and these pleats are rolled up along with a portion of the rolled-up area. The corrugated structure increases the strength of the outer cup layer and makes the paper cup heat-resistant. The pleats also form in the rolled-up area, preventing bending due to reduced thickness. Furthermore, during the rolled-up forming process, the rolled-up portion where the sealing area is located is less prone to tearing.

[0008] In the aforementioned double-layer paper cup sealing structure, the outer cup layer has a flat structure and can be made of tin foil, plastic paper, silicone paper, cellophane, or tar paper. The flat structure of the outer cup layer facilitates the addition of patterns or designs, enhancing the paper cup's aesthetic appeal.

[0009] In the aforementioned double-layer paper cup sealing structure, the first and second ends of the outer cup layer overlap, and the overlap position is staggered from the sealing area. The sealing area consists of four layers: the second end of the outer cup layer, the second end of the inner cup layer, the first end of the outer cup layer, and the first end of the inner cup layer; and three layers: the second end of the outer cup layer, the second end of the inner cup layer, and the sealing area. This overlapping method ensures that during the rolling process, the sealing area and the inner cup layer are rolled together at the opening, resulting in a more sealed and stable bond at the opening. Furthermore, the rolling process increases the sealing strength of the opening area, making the connection between the two ends of the paper cup more sealed and stable, and less prone to separation.

[0010] In the above-mentioned double-layer paper cup sealing structure, the first end of the outer cup layer and the second end of the outer cup layer are joined together, and the joining position is located on one side of the sealing area, or there is a gap between the first end of the outer cup layer and the second end of the outer cup layer. The sealing area is: the three layers formed by the second end of the outer cup layer, the second end of the inner cup layer and the sealing area, and the two layers formed by the first end of the outer cup layer and the first end of the inner cup layer.

[0011] In the above-mentioned double-layer paper cup sealing structure, the thickness of the rolled edge area is 0.3-1mm.

[0012] In the aforementioned double-layer paper cup sealing structure, the paper cup also includes a cup bottom with an adhesive layer. The lower edges of the inner and outer cup layers are flush and, after compression, form a bending area. The ends of the bending area are bent to form a folded layer. The adhesive layer is located between the bending area and the folded layer, and is bonded and fixed to both the bending area and the folded layer. The folded layer ensures that the sealing area and the second end of the inner cup layer also have connection strength.

[0013] In the above-mentioned double-layer paper cup sealing structure, the second end of the outer cup layer is flush with the second end of the inner cup layer.

[0014] In the aforementioned double-layer paper cup sealing structure, a waterproof layer is provided on the inner wall of the inner cup layer. When the sealing area overlaps the inner side of the second end of the inner cup layer to form a sealed adhesive connection, one end of the waterproof layer is connected to the waterproof layer body. This connection prevents water leakage between the sealing area and the second end of the inner cup layer. In the sealing area, the end face of the first end of the outer cup layer abuts against the waterproof layer, further increasing the sealing performance of the sealing area.

[0015] In the aforementioned double-layer paper cup sealing structure, an adhesive layer is formed between the outer cup layer and the inner cup layer. One end of the adhesive layer in the sealing area abuts against the waterproof layer, improving the sealing performance and connection strength of the sealing area.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This double-layer paper cup adopts a double-layer structure with a thicker inner layer and a thinner outer layer. The sealing structure uses separate sealing of the inner and outer cup layers, relying entirely on the sealing of the inner cup layer. This sealing structure uses at least three layers bonded together, and the thicker edge is modified by compression, reducing the thickness of the rolled edge area, making it suitable for automated mechanical rolling. The at least three-layer sealing structure provides sufficient support for the paper cup, maintaining its strength, and preventing deformation or bending of the cup wall formed by the rolled edge area.

[0018] 2. The three-layer edge sealing structure, due to its cross-stacked design, can form a better adhesive effect after sealing. The sealed area is not easy to tear or detach, and the anti-tear or detachment effect is further enhanced by compression and rolling.

[0019] 3. When using a corrugated outer cup layer, the compression of the corrugations causes the hollow parts of the corrugations to form folds. These folds, due to the creases and the overlapping of multiple layers, strengthen the rolled edge area, resulting in better strength after rolling. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of a half-section;

[0022] Figure 3 yes Figure 2 Enlarged schematic diagram of part B in the middle;

[0023] Figure 4 yes Figure 2 An enlarged schematic diagram of part A in the middle;

[0024] Figure 5 yes Figure 1 A schematic diagram of the structure of a double-layered paper cup when fully unfolded;

[0025] Figure 6 This is a schematic diagram of the composite structure of a double-layered paper cup before the edges are sealed.

[0026] Figure 7 yes Figure 2 A schematic diagram of the cross-sectional structure of the CC section;

[0027] Figure 8 yes Figure 2 A schematic diagram of the cross-sectional structure of the DD section, which is a schematic diagram of the specific structure of the cup rim roll area of ​​the double-layer paper cup after compression by the same cross-sectional thickness as CC;

[0028] Figure 9 This is an enlarged structural diagram of the seam of a double-layered paper cup;

[0029] Figure 10 This is an enlarged structural diagram of the seam portion of the double-layered paper cup in Example 2.

[0030] In the diagram, 1. Paper cup; 2. Inner cup layer; 21. First end of inner cup layer; 211. Sealing area; 22. Second end of inner cup layer; 3. Outer cup layer; 31. First end of outer cup layer; 32. Second end of outer cup layer; 4. Sealing area; 5. Rolled edge area; 51. Rolled edge; 52. Cup wall; 6. Cup bottom; 61. Adhesive layer; 7. Bending area; 71. Folded layer; 8. Waterproof layer; 9. Glue layer. Detailed Implementation

[0031] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example

[0032] like Figure 1 As shown, the paper cup 1 has a hollow, flared cup structure, including a rolled rim 51 and a cup bottom 6. The outer surface of the cup body is corrugated, which serves to prevent slipping and burns. The corrugations are roughly joined at the seams of the paper cup 1, increasing the aesthetic appeal of the paper cup 1.

[0033] like Figure 2 As shown, the paper cup 1 includes a cup body, which consists of a waterproof layer 8, an inner cup layer 2, an adhesive layer 9, and an outer cup layer 3 from the inside out. The inner cup layer 2 is thicker than the outer cup layer 3, therefore it is the main load-bearing structure. The inner cup layer 2 ensures the stiffness of the paper cup 1 and enhances its connection strength. The outer cup layer 3 has a corrugated structure, and the recessed part of the corrugated structure of the outer cup layer 3 is bonded to the inner cup layer 2 through the adhesive layer 9. Above the paper cup 1 is a rolled-up rim area 5, and below the paper cup 1 is a bending area 7. The thickness of the rolled-up rim area 5 is less than the thickness of the cup body. The upper part of the rolled-up rim area 5 is rolled up to form a rolled-up rim 51, which enhances the strength of the cup rim and facilitates drinking.

[0034] Specifically, such as Figure 3 As shown, an adhesive layer 61 is provided on the cup bottom 6. The bending area 7 is formed by extruding the cup body. After bending at the end of the bending area 7, a folded layer 71 is formed. The adhesive layer 61 is placed between the bending area 7 and the folded layer 71 and bonded and fixed, so that the cup bottom 6 is fixed to the body of the paper cup 1. The adhesive layer 61 located between the bending area 7 and the folded layer 71 provides support for the cup bottom 6, making the connection between the cup bottom 6 and the body of the paper cup 1 more stable, and improving the sealing between the cup bottom 6 and the body of the paper cup 1, making it less prone to leakage.

[0035] like Figure 4 As shown, the thickness of the rolled edge region 5 is between 0.3-1mm, with an optimal thickness of 0.5mm. The rolled edge region 5 is formed by extruding the cup body. The end of the rolled edge region 5 is rolled to form the rolled edge 51, and the remaining part is the cup wall 52 of the extruded cup body. Although this part of the cup wall 52 is only between 0.3-1mm thick, it has sufficient strength because it is composed of multiple layers.

[0036] like Figure 5 As shown, after the formed paper cup is torn open, the specific structure of the cup body after unfolding is as follows: the outer cup layer 3 is a corrugated structure. The outer cup layer 3 is bonded to the fan-shaped outer peripheral surface of the inner cup layer 2. The fan-shaped length of the inner cup layer 2 is greater than the fan-shaped length of the outer cup layer 3, so that the first end 31 of the outer cup layer does not cover the edge of the first end 21 of the inner cup layer. The part of the first end 21 of the inner cup layer that does not cover the edge of the outer cup layer 3 is the sealing area 211. The second end 32 of the outer cup layer and the second end 22 of the inner cup layer are flush. The upper and lower ends of the inner cup layer 2 are flush with the outer cup layer 3. The upper edge is the compressed rolled edge area 5, and the lower edge is the compressed bent area 7.

[0037] Figure 5 The state is through, as Figure 6 As shown and Figure 9 What was obtained Figure 6 The multi-layered structure of the cup is shown, consisting of a waterproof layer 8, an inner cup layer 2, and an outer cup layer 3. The waterproof layer 8 is located on the inside of the paper cup 1. The waterproof layer 8 is adhesive and bonded to the inner cup layer 2. The waterproof layer 8 and the inner cup layer 2 are the same shape and size, ensuring that the inner wall of the paper cup 1 is covered by the waterproof layer 8 after folding, guaranteeing the airtightness of the paper cup 1. Figure 9 As shown, through Figure 6 When the cup body and sleeve are joined together, a state will be formed. Figure 9 The edge sealing area 4 shown is specifically: the first end 31 of the outer cup layer and the second end 32 of the outer cup layer overlap, and the overlap position is staggered from the edge sealing area 211. The edge sealing area 4 is: the second end 32 of the outer cup layer, the second end 22 of the inner cup layer, the first end 31 of the outer cup layer and the first end 21 of the inner cup layer form four layers, and the second end 32 of the outer cup layer, the second end 22 of the inner cup layer and the edge sealing area 211 form three layers.

[0038] Figure 6 The fan-shaped pieces were rolled and bonded together to form the cup body, and the cross-sectional shape of the cup body is as follows. Figure 7 As shown, an adhesive layer 9 is also provided between the inner cup layer 2 and the outer cup layer 3. The recessed part of the corrugated outer cup layer 3 is bonded and fixed to the inner cup layer 2 by the adhesive layer 9, and the protruding part of the corrugated outer cup layer 3 forms a heat insulation cavity. In the rolled edge area 5, Figure 6 The structure was compressed, forming Figure 8 After compression, the rolled edge region 5 forms folds on the protruding part of the outer cup layer 3 when compressed. These folds enhance the strength of the rolled edge region 5, preventing deformation of the rolled edge 51 during use. At this time, the rolled edge 51 is formed by winding around the portion of the rolled edge region 5 reinforced by the folds. By winding the folds together in the rolled edge 51, the rolled edge 51 has good structural strength.

[0039] The principle of this solution is as follows: When the paper cup 1 is formed, it first overlaps the inner side of the inner cup layer 2 through the sealing area 211, and then overlaps the second end 22 of the inner cup layer onto the first end 31 of the outer cup layer, so that the paper cup 1 transitions evenly at the connection point, avoiding direct connection between the first end 31 of the outer cup layer and the body of the inner cup layer 2. In the sealing area 4, the end face of the first end 31 of the outer cup layer abuts against the waterproof layer 8, and one end of the adhesive layer 9 abuts against the waterproof layer 8, improving the sealing performance and connection strength of the sealing area 4. When the paper cup 1 forms the rolled mouth 51 and the cup bottom 6, the overlapping area has many layers and is not easy to roll. Therefore, the paper cup 1 is squeezed to form the rolled mouth area 5 and the bending area 7, and the wrinkles of the outer cup layer 3 compensate for the weakening of strength caused by the compression. Example

[0040] Example 2 is basically the same as Example 1, except that the edge sealing area 4 is a butt joint structure, as shown in the figure below. Figure 10 As shown, the first end 31 and the second end 32 of the outer cup layer are joined together, and the joining position is located on one side of the sealing area 211, or a gap is left between the first end 31 and the second end 32 of the outer cup layer. The sealing area 4 consists of three layers: the second end 32 of the outer cup layer, the second end 22 of the inner cup layer, and the sealing area 211, and two layers: the first end 31 of the outer cup layer and the first end 21 of the inner cup layer. Compared with the sealing area 4 of Embodiment 1, although the number of layers is reduced, it still has sufficient strength to maintain the strength of the rolled edge area 5 because the inner cup layer 2 is a thicker paper with sufficient strength. Example

[0041] Example 3 is basically the same as Example 1 or Example 2, except that the outer cup layer 3 has a planar structure and can be made of tin foil, plastic paper, silicone paper, cellophane, or tar paper, which can be designed in various shapes. Because the inner cup layer 2 is a thicker paper, it still has sufficient strength after being rolled together with the outer paper through this sealing structure.

[0042] The specific embodiments described herein are merely illustrative examples of the scope of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the scope of the invention or exceeding the scope defined by the appended claims.

Claims

1. A double-layered paper cup edge sealing structure, said double-layered paper cup (1) comprising a cup body including only an inner cup layer (2) and an outer cup layer (3), characterized in that, The thickness of the inner cup layer (2) is greater than that of the outer cup layer (3), and the outer cup layer (3) is bonded to the outer circumferential surface of the inner cup layer (2), the inner cup layer (2) and the outer cup layer (3) are unfolded to form a fan shape, the fan length of the inner cup layer (2) is greater than that of the outer cup layer (3), the first end (31) of the outer cup layer does not cover the edge of the first end (21) of the inner cup layer, the edge of the outer cup layer (3) not covered by the first end (21) of the inner cup layer is the edge sealing area (211), when the edge sealing area (211) is overlapped on the inner side of the inner cup layer and forms a sealed bond, the first end (31) of the outer cup layer, the second end (32) of the outer cup layer, the second end (22) of the inner cup layer and the first end (21) of the inner cup layer form at least three layers of edge sealing areas (4) that are in close contact, the edge sealing area (4) is close to the upper edge of the cup and is extruded to form a rolled edge area (5) with a thickness less than the rest of the edge sealing area (4), the outer cup layer (3) is corrugated paper with an inclined corrugated structure, when the rolled edge area (5) is extruded, the protruding part of the outer cup layer (3) forms a wrinkle that strengthens the strength of the rolled edge area (5), part of the rolled edge of the rolled edge area (5) forms a rolled edge (51), the wrinkle is rolled in the rolled edge (51), and the rest is the cup wall (52) of the extruded cup.

2. The edge sealing structure of a double-layered paper cup according to claim 1, wherein The outer cup layer (3) is a flat structure, and the outer cup layer is tin paper, plastic paper, silicone oil paper, glass paper or asphalt paper.

3. The double-layered paper cup edge sealing structure according to claim 2, wherein The first end (31) and the second end (32) of the outer cup layer are overlapped, and the overlapping position is staggered with the edge sealing area (211), the edge sealing area (4) is formed by the second end (32) of the outer cup layer, the second end (22) of the inner cup layer, the first end (31) of the outer cup layer and the first end (21) of the inner cup layer, and the edge sealing area (4) is formed by the second end (32) of the outer cup layer, the second end (22) of the inner cup layer and the edge sealing area (211).

4. The double-layered paper cup edge sealing structure according to claim 2, wherein The first end (31) and the second end (32) of the outer cup layer are abutted, and the abutting position is located on one side of the edge sealing area (211), the edge sealing area (4) is formed by the second end (32) of the outer cup layer, the second end (22) of the inner cup layer and the edge sealing area (211), and the edge sealing area (4) is formed by the first end (31) of the outer cup layer and the first end (21) of the inner cup layer.

5. The double-layered paper cup edge sealing structure according to claim 2, wherein The first end (31) and the second end (32) of the outer cup layer are abutted, and the abutting position is located on one side of the edge sealing area (211), the edge sealing area (4) is formed by the second end (32) of the outer cup layer, the second end (22) of the inner cup layer and the edge sealing area (211), and the edge sealing area (4) is formed by the first end (31) of the outer cup layer and the first end (21) of the inner cup layer.

6. The double-layered paper cup edge sealing structure according to claim 3, wherein The first end (31) and the second end (32) of the outer cup layer are abutted, and the abutting position is located on one side of the edge sealing area (211), the edge sealing area (4) is formed by the second end (32) of the outer cup layer, the second end (22) of the inner cup layer and the edge sealing area (211), and the edge sealing area (4) is formed by the first end (31) of the outer cup layer and the first end (21) of the inner cup layer. The paper cup further comprises a cup bottom (6), the cup bottom (6) is provided with a bonding layer (61), the lower edges of the inner cup layer (2) and the outer cup layer (3) are flush and form a bending area (7) after extrusion, the end of the bending area (7) is bent to form a folding layer (71), the bonding layer (61) is located between the bending area (7) and the folding layer (71), and the bonding layer (61) is bonded and fixed with the bending area (7) and the folding layer (71).

7. The double-layered paper cup edge sealing structure according to claim 6, wherein The end of the outer cup layer (3) is flush with the other end of the inner cup layer (2).

8. The double-layered paper cup edge sealing structure according to claim 7, wherein The thickness of the roll mouth area (5) is 0.3-1mm.

9. The double-layered paper cup edge sealing structure according to claim 8, wherein The inner wall of the inner cup layer is provided with a waterproof layer (8), when the sealing edge area (211) is overlapped on the inner side of the second end (22) of the inner cup layer and forms a sealed adhesive connection, one end of the waterproof layer (8) is connected with the body of the waterproof layer (8), and the outer cup layer (3) and the inner cup layer (2) form a glue layer (9).

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