Paper cup inner seam lap joint heat sealing structure

Abstract

The utility model relates to the technical field of paper cups, in particular to a paper cup inner seam lap joint heat sealing structure which comprises a cup body, a waterproof layer is attached to the inner wall of the cup body, after the cup body is wound, one end of the cup body is in lap joint with the other end of the cup body, and a welding heat sealing area penetrating through the upper end and the lower end of the cup body is formed on the outer surface of the lap joint position. Indentations recessed into the cup body are formed in the welding heat sealing area, and a pressure relief part can be formed between the indentations. Therefore, the overflow rate of the welding material from the lap joint gap of the paper cup body can be effectively prevented, the welding edge sealing quality is improved, the bonding pressure intensity of the waterproof layer can be improved, and the firmness and effect of edge sealing bonding are effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of paper cup technology, and in particular relates to a heat-sealing structure for overlapping seams in paper cups. Background Technology

[0002] A paper cup is a disposable cup made of paper that is convenient to carry and use.

[0003] The seam overlap of paper cups is generally sealed using an ultrasonic edge sealing machine. The main working principle of the ultrasonic edge sealing machine is to convert high-frequency electrical signals into mechanical vibrations through an ultrasonic transducer. These vibrations are transmitted to the paper cup material to be sealed through the connected vibrating head. Due to the extremely high vibration frequency, a large amount of heat energy is generated at the contact point of the paper cup material, causing the material surface to melt. The melted material quickly adheres under the action of ultrasonic vibration, forming a tight seal.

[0004] During the heat sealing process, the molten adhesive material is prone to overflowing from the overlapping seams of the paper cup due to the pressure of the ultrasonic vibrating head. At the same time, the molten adhesive material cannot bond with the cup material under high pressure, which reduces the quality of the heat sealing process and makes it easy for localized delamination to occur at the center seam. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a heat-sealing structure for overlapping seams in paper cups.

[0006] The purpose of this utility model can be achieved through the following technical solution: a paper cup seam overlap heat-sealing structure, including a cup body, a waterproof layer is attached to the inner wall of the cup body, one end of the cup body is overlapped on the other end after being rolled up, and a fusion heat-sealing area is formed on the outer surface of the overlap, which runs through the upper and lower ends of the cup body. An indentation is formed in the fusion heat-sealing area, and a pressure relief part can be formed between the indentations.

[0007] Preferably, the indentations are arranged in a matrix uniformly on the fusion heat-sealing area.

[0008] Preferably, the cup body unfolds into a fan shape.

[0009] Preferably, the width of the fusion heat-sealing zone is greater than or equal to 5 mm.

[0010] Preferably, the cup body includes an inner cup layer and an outer cup layer, both of which are fan-shaped when unfolded. The outer cup layer is bonded to the outer circumferential surface of the inner cup layer. One end of the outer cup layer does not cover the edge of the inner cup layer, and a sealing area is formed at that end that runs through the upper and lower ends of the cup body. After the cup body is rolled up, the heat-sealed welding area is located above the sealing area.

[0011] Preferably, the projected surface of the heat-sealed area after the cup body is wound can coincide with the sealing area.

[0012] Preferably, the outer cup layer is corrugated paper with a corrugated structure or has a structure with hollow protrusions.

[0013] Preferably, the outer cup layer has a planar structure and is made of tin foil, plastic paper, silicone paper, cellophane, or tar paper.

[0014] Preferably, the upper edge of the cup body is rolled outward to form a rolled opening.

[0015] Preferably, the paper cup also includes a cup bottom, the bottom of the cup body is bent inward to form a folded edge, and the cup bottom is embedded in the groove formed by the folded edge and the inner wall of the cup body and is bonded to both to seal the bottom of the rolled cup body.

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

[0017] The heat-sealing edge-sealing structure of this paper cup reduces the time the vibrating head needs to stay on the paper cup material to be sealed, thereby improving the sealing efficiency of double-layer paper cups; when the waterproof layer is squeezed, most of it flows to the pressure relief part, which can effectively reduce the leakage of welding material from the overlap gap of the paper cup body and improve the quality of welding and sealing; the indentation reduces the force-bearing area at the contact point between the vibrating head and the paper cup material, increasing the adhesive pressure at the waterproof layer, effectively improving the adhesion and effect; this sealing structure can increase the friction when gripping and has a comfortable grip, making it more practical and aesthetically pleasing. Attached Figure Description

[0018] Figure 1 This is an isometric view of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the cup's unfolded structure.

[0020] Figure 3 This is a schematic diagram of the cup body's indentation structure.

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the cup.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of a double-layered cup.

[0023] Figure 6 This is a schematic diagram of the unfolded structure of the double-layered cup.

[0024] Figure 7 This is a schematic diagram of the composite structure of the cup body. Figure 1 .

[0025] Figure 8 This is a schematic diagram of the composite structure of the cup body. Figure 2 .

[0026] Figure 9 This is a schematic diagram of the cross-sectional structure of a double-layered cup. Figure 1 .

[0027] Figure 10 This is a schematic diagram of the cross-sectional structure of a double-layered cup. Figure 2 .

[0028] In the diagram, 1 is the cup body; 11 is the rolled edge; 12 is the folded edge; 2 is the inner cup layer; 21 is the sealing area; 3 is the outer cup layer; 31 is the fusion heat-sealing area; 32 is the indentation; 33 is the pressure relief part; 4 is the waterproof layer; and 5 is the bottom of the cup. Detailed Implementation

[0029] The specific embodiments of this utility model are described in conjunction with the accompanying drawings, and the technical solution of this utility model will be further described. However, this utility model is not limited to these embodiments.

[0030] like Figures 1-4 As shown, a heat-sealed structure with a seam overlap in a paper cup includes a cup body 1. A waterproof layer 4 is attached to the inner wall of the cup body 1. After the cup body 1 is rolled up, one end overlaps with the other end, and a fusion heat-sealing area 31 is formed on the outer surface of the overlap, which runs through the upper and lower ends of the cup body 1. An indentation 32 is formed in the fusion heat-sealing area 31, which is recessed into the cup body 1, and a pressure relief part 33 can be formed between the indentations 32.

[0031] As can be understood, pressure refers to the force exerted on a unit area of ​​an object. It is used to represent the effect produced by the force. The formula for calculating pressure is P = F / S, where P represents pressure, F represents force, and S represents the area of ​​force application. During the sealing process of the cup body 1, the high-frequency vibration generated by the ultrasonic generator is transmitted to the vibrating plate through the transducer. The vibrating plate adheres to the fusion heat-sealing area 31 on the outer cup layer 3, thereby transferring the pressure from the cup body 1 to the waterproof layer 4 material of the paper cup. Due to the extremely high vibration frequency, a large amount of heat energy is generated at the contact point. The heat energy is conducted layer by layer, causing the corresponding waterproof layer 4 to melt locally. Under the adhesion pressure of the vibrating plate, the cup body 1 material layers on both sides of the waterproof layer 4 are fused together. Together, they form a strong seal. Because the indentation 32 is recessed into the cup body 1, the distance between the vibrating plate and the waterproof layer 4 can be shortened. With the ultrasonic sealing machine power remaining unchanged, the time that the vibrating head needs to stay on the paper cup material to be sealed can be reduced, thereby improving the sealing efficiency of double-layer paper cups. When the bonding pressure between the vibrating plate and the welding area 31 is constant, the force-bearing area at the indentation 32 is small, which increases the adhesive pressure transmitted to the waterproof layer 4, effectively improving the adhesive strength and effect. The molten waterproof layer 4 is squeezed by the higher adhesive pressure, and most of it flows to the pressure relief part 33. Therefore, it can effectively reduce the overflow of the waterproof layer 4 from the overlap gap of the paper cup body 1, and improve the welding and sealing quality. Figure 5As shown, the sealing structure at this location consists of, from the inside out, a waterproof layer 4, a cup body 1, another waterproof layer 4, and a cup body 1.

[0032] In some embodiments, the shape of the indentation 32 can be customized to resemble a company logo, serving as a form of publicity or to enhance the company's image.

[0033] like Figure 1 , Figure 2 As shown, in this embodiment, a plurality of indentations 32 are evenly arranged in a matrix on the fusion heat-sealing area 31. Since the fusion heat-sealing area 31 extends through the upper and lower ends of the cup body 1, the plurality of indentations 32 can also be evenly arranged in a matrix on the fusion area 31 to form a sealing grid extending through the upper and lower ends of the cup body 1, which has good sealing firmness. The plurality of indentations 32 make the surface of the fusion heat-sealing area 31 rough, which is used to increase the friction when gripping and to provide a comfortable grip.

[0034] Furthermore, the cup body 1 unfolds into a fan shape. Therefore, when the cup body 1 is rolled up, it will form a frustum shape with a larger upper end and a smaller lower end. The design of the larger end makes the paper cup more stable and easier to hold, and the lips can more easily fit the edge of the paper cup when drinking, making it easier to drink.

[0035] Furthermore, the width of the welded heat-sealing area 31 is greater than or equal to 5 mm. This allows the indentations 32 to be arranged in various shapes and configurations on the welded area 31.

[0036] like Figure 6 , Figure 9 As shown, the cup body 1 includes an inner cup layer 2 and an outer cup layer 3. Both the inner cup layer 2 and the outer cup layer 3 are fan-shaped when unfolded. The outer cup layer 3 is bonded to the outer circumferential surface of the inner cup layer 2. One end of the outer cup layer 3 does not cover the edge of the inner cup layer 2, and a sealing area 21 is formed at this end, which runs through the upper and lower ends of the cup body 1. The heat-sealing area 31 of the cup body 1 after being rolled up is located above the sealing area 21.

[0037] Double-walled paper cups are widely used in various beverage applications that require long-term heat preservation due to their excellent sealing, strength, and heat preservation properties. However, because the walls of double-walled paper cups are thicker, the vibrating head of the ultrasonic sealing machine needs to stay on the paper cup material to be sealed for a longer time during the welding process in order to ensure the quality of the edge sealing. This results in low processing efficiency.

[0038] In this embodiment, after the cup body 1 is wound, one end with the fusion heat-sealing area 31 is superimposed on the sealing area 21. The sealing structure here, from the inside to the outside, consists of a waterproof layer 4, an inner cup layer 2, a waterproof layer 4, an inner cup layer 2, and an outer cup layer 3. A portion of the sealing structure can also be superimposed on the outer cup layer 3. The sealing structure here, from the inside to the outside, consists of a waterproof layer 4, an inner cup layer 2, an outer cup layer 3, a waterproof layer 4, an inner cup layer 2, and an outer cup layer 3. This allows the waterproof layer 4, which is located in the middle and is used for fusion, to be zigzag-shaped, which can improve the leak-proof performance at the sealing edge.

[0039] Furthermore, such as Figure 10 As shown, the projected surface of the heat-sealing area 31 of the cup body 1 after winding can coincide with the sealing area 21.

[0040] When the cup body 1 is wound, the edge of the outer cup layer 3 has a certain limiting and blocking effect on the end of the cup body 1 with the welding heat sealing area 31, making it easier for the two ends of the cup body 1 to be connected. The sealing structure here consists of a waterproof layer 4, an inner cup layer 2, a waterproof layer 4, an inner cup layer 2, and an outer cup layer 3 from the inside to the outside. Therefore, the thickness of the cup body 1 to be welded is relatively small, which can improve the welding efficiency and the aesthetics of the weld.

[0041] Furthermore, such as Figure 7 As shown, the outer cup layer 3 is corrugated paper with a corrugated structure or a structure with hollow protrusions. The outer layer of the corrugated paper cup has good heat preservation and moisture retention effects, good thermal insulation effect, and high compressive strength.

[0042] like Figure 8 As shown, the outer cup layer 3 has a planar structure and can be made of tin foil, plastic paper, silicone paper, glassine paper, or tar paper. This heat-sealing structure can also be adapted to various outer cup layer 3 materials, making it suitable for a wide range of applications and highly practical.

[0043] Furthermore, such as Figure 1 , Figure 5 As shown, the upper edge of the cup body 1 is rolled outward to form a rolled opening 11. The rolled opening 11 is designed to increase the strength of the cup opening, prevent cuts to the mouth and fingers when drinking, facilitate the removal of the cup and fit various cup lids, and enhance the overall aesthetics.

[0044] The paper cup also includes a cup bottom 5. The bottom of the cup body 1 is bent inward to form a folded edge 12. The cup bottom 5 is embedded in the groove formed by the folded edge 12 and the inner wall of the cup body 1 and is bonded to both to seal the bottom of the rolled cup body 1.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A heat-sealed structure with overlapping seams in a paper cup, comprising a cup body (1), wherein a waterproof layer (4) is adhered to the inner wall of the cup body (1), characterized in that, After the cup body (1) is rolled up, one end overlaps with the other end and a heat-sealing area (31) is formed on the outer surface of the overlap, which runs through the upper and lower ends of the cup body (1). An indentation (32) is formed in the heat-sealing area (31) that is recessed into the cup body (1), and a pressure relief part can be formed between the indentations (32).

2. The heat-sealing structure for the center seam overlap of a paper cup according to claim 1, characterized in that, Several of the indentations (32) are evenly arranged in a matrix on the welded heat-sealing area (31).

3. According to claim 2, the paper cup with seam overlap heat sealing structure is fan-shaped after the cup body (1) is unfolded.

4. The paper cup seam overlap heat-sealing structure according to claim 2, characterized in that, The width of the fusion heat-sealing zone (31) is greater than or equal to 5 mm.

5. A paper cup seam overlap heat-sealing structure according to any one of claims 1-4, wherein the cup body (1) includes an inner cup layer (2) and an outer cup layer (3), both the inner cup layer (2) and the outer cup layer (3) are fan-shaped after unfolding, the outer cup layer (3) is bonded to the outer circumferential surface of the inner cup layer (2), one end of the outer cup layer (3) does not cover the edge of the inner cup layer (2), and a sealing area (21) connecting the upper and lower ends of the cup body (1) is formed at that end, and the heat-sealing area (31) of the cup body (1) is located above the sealing area (21).

6. The heat-sealing structure for the center seam overlap of a paper cup according to claim 5, characterized in that, The projected surface of the heat-sealed area (31) after the cup body (1) is wound can coincide with the sealing area (21).

7. The heat-sealing structure for the center seam overlap of a paper cup according to claim 5, characterized in that, The outer cup layer (3) is corrugated paper with a corrugated structure or a structure with hollow protrusions.

8. The heat-sealing structure for the overlap of the center seam of a paper cup according to claim 5, characterized in that, The outer cup layer (3) is a planar structure, and the outer cup layer (3) is made of tin foil, plastic paper, silicone paper, glass paper or tar paper.

9. A heat-sealing structure for overlapping seams in a paper cup according to any one of claims 1-4, characterized in that, The upper edge of the cup body (1) is rolled outward to form a rolled opening (11).

10. The heat-sealing structure for the center seam overlap of a paper cup according to claim 9, characterized in that, The paper cup also includes a cup bottom (5), the bottom of the cup body (1) is bent inward to form a folded edge (12), the cup bottom (5) is embedded in the groove formed by the folded edge (12) and the inner wall of the cup body (1) and is bonded to both to seal the bottom of the rolled cup body (1).

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