An acid- and oil-resistant leak-proof cardboard box

Abstract

This utility model relates to the field of paper container technology, and in particular to an acid- and oil-resistant leak-proof paper box. It mainly solves the problem of poor leak-proof performance of existing paper boxes. The paper box includes a box body and a box bottom. The box body includes a sheet-like paper wall. One side of the paper wall in the transverse direction has an outward folding first fold, and the other side of the paper wall in the transverse direction has an inward folding second fold. The first fold and the second fold are hooked together and connected by heat pressing, so that the box body forms a ring structure with the ends connected. The paper wall includes a paper sheet, a first coating layer on one side of the paper sheet, and a second coating layer on the other side of the paper sheet. The box bottom is located at the lower part of the box body. The box body and the box bottom form an upward-opening cavity for holding liquid. The upper edge of the box body has an outwardly extending flat edge.

Description

Technical Field

[0001] This utility model relates to the field of paper container technology, and in particular to an acid-resistant, oil-resistant, leak-proof paper box. Background Technology

[0002] Paper containers such as paper boxes and paper cups are convenient to use for holding liquids such as water, coffee, milk, and yogurt, or for mixing or preparing materials such as instant noodles and powdered drinks. Compared with glass cups, paper containers such as paper boxes and paper cups have the advantages of low cost, portability, and safety. Compared with plastic cups, paper cups have the advantages of high temperature resistance and no pollution. Therefore, paper containers have a very wide range of applications.

[0003] Paper cups and paper boxes have similar structures. For example, a paper cup disclosed in Chinese Patent Application No. 201720201523.1 includes a cup body and a cup bottom. The upper edge of the cup body is provided with an outwardly folded rolled edge. The side wall of the cup body is formed by connecting and fixing a single paper wall end to end. The end of the paper cup is connected to form a cup body joint. The edge of the cup bottom is bent downward to form a lower edge fold area. The lower edge fold area is wrapped and glued together by an inwardly folded area at the bottom of the cup body side wall to form an upward-opening cavity. The bonding strength between the cup bottom and the cup body side wall is increased by the tight pressing lines provided outside the inwardly folded area. The rolled edge design keeps the lips away from the cup body that is in direct contact with the liquid when drinking, preventing burns to the lips during pouring.

[0004] However, the cup body of a paper cup is formed by gluing the ends together. During the gluing process, areas need to be reserved at both ends for applying glue and for them to adhere to each other. After gluing, the joint on the inner surface of the cup body is stepped. When yogurt or oily substances are contained for a long time, it is easy for the glue to seep out from between the two layers of paper at the joint, causing leakage. Summary of the Invention

[0005] Therefore, in view of the above problems, this utility model provides an acid- and oil-resistant leak-proof paper box, which mainly solves the problem of poor leak-proof performance of paper boxes in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an acid- and oil-resistant leak-proof paper box, comprising a paper box body, the paper box body comprising a box body and a box bottom, the box body comprising a sheet-like paper wall, defined as extending laterally along the length direction of the paper wall and extending longitudinally along its width direction, the paper wall having an outwardly folded first fold on one side of the lateral direction, and an inwardly folded second fold on the other side of the lateral direction, the first fold and the second fold being hooked together and connected by heat pressing, so that the box body forms a ring structure with the ends connected, the paper wall comprising a paper sheet, a first coating layer on one side of the paper sheet and a second coating layer on the other side of the paper sheet, the box bottom being located at the lower part of the box body, the box body and the box bottom forming an upward-opening cavity for holding liquid, and the upper edge of the box body having an outwardly extending flat edge.

[0007] Furthermore, the paper wall has a first arc-shaped edge and a second arc-shaped edge distributed in the transverse direction, and a first straight edge and a second straight edge distributed in the longitudinal direction.

[0008] Furthermore, an inclined edge is provided at the connection between the first arc-shaped edge and the first straight edge.

[0009] Furthermore, a notch with a right-angle structure is provided at the connection between the second arc-shaped edge and the second straight edge.

[0010] Furthermore, the angle between the box body and its central axis is 0° to 20°.

[0011] Furthermore, the cardboard box body has a square or circular structure.

[0012] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This acid- and oil-resistant leak-proof cardboard box is formed by winding and bonding a single sheet of paper wall to create a box body, thereby reducing the number of bonding areas on the box body. Furthermore, the bonding areas are connected by hooking a first fold on one side of the paper wall in the transverse direction with a second fold on the other side, and then hot-pressing the first and second folds together to form a ring-shaped structure with the ends connected, thus improving the leak-proof effect of the bonding areas. Simultaneously, a first coating layer and a second coating layer are respectively provided on both sides of the paper sheet. During hot pressing, the first and second coating layers melt and mix, and are then fixed together after cooling, forming a unified structure between adjacent layers of paper wall at the bonding areas, preventing gaps and enabling long-term storage of acidic substances such as yogurt or oily substances, thus providing acid and oil resistance. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of this utility model; Figure 2 This is a cross-sectional view of the paper box body along the horizontal plane in Embodiment 1 of this utility model; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a cross-sectional view of the paper box body along a vertical plane in Embodiment 1 of this utility model; Figure 5 yes Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a schematic diagram of the paper wall in its unfolded state in Embodiment 1 of this utility model; Figure 7 This is a three-dimensional structural diagram of Embodiment 2 of this utility model. Detailed Implementation

[0014] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0015] The embodiment of this utility model is as follows: Example 1

[0016] refer to Figures 1 to 6 As shown, an acid- and oil-resistant leak-proof cardboard box includes a cardboard box body 1. In this embodiment, the cardboard box body 1 has a circular structure. The cardboard box body 1 includes a box body 11 and a box bottom 12. The box body 11 includes a sheet-like paper wall 2, which extends laterally along its length and longitudinally along its width. One side of the paper wall 2 in the lateral direction has an outwardly folded first fold portion 3, and the other side of the paper wall 2 in the lateral direction has an inwardly folded second fold portion 4. The first fold portion 3 and the second fold portion 4 are hooked together and connected by heat through the first fold portion 3 and the second fold portion 4. The box body 11 is pressed together to form a ring structure with the ends connected. The paper wall 2 includes a paper sheet 21, a first coating layer 22 on one side of the paper sheet 21, and a second coating layer 23 on the other side of the paper sheet 21. The box bottom 12 is located at the lower part of the box body 11. The periphery of the box bottom 12 extends downward and bends to form a lower bend 5. The lower bend 5 is wrapped by the inner bend 6 that is rolled inward by the lower edge of the box body 11 and then heat-pressed together. The box body 11 and the box bottom 12 form a cavity 13 with an upward opening for holding liquid. The upper edge of the box body 11 is provided with an outwardly extending flat edge 7.

[0017] This acid- and oil-resistant leak-proof cardboard box is formed by winding and bonding a single sheet of paper wall 2 to create a box body 11. This reduces the number of bonding areas a on the box body 11. The bonding areas a are connected by hooking a first fold 3 on one side of the paper wall 2 in the transverse direction with a second fold 4 on the other side. The first fold 3 and the second fold 4 are then heat-pressed together, forming a ring-shaped structure with the box body 11 connected end-to-end. This improves the leak-proof effect of the bonding areas a. Simultaneously, a first coating layer 22 and a second coating layer 23 are respectively applied to the two sides of the paper sheet 21 of the paper wall 2. During heat pressing, the first coating layer 21 and the second coating layer 22 melt and mix, then are fixed together after cooling. This makes the adjacent two layers of paper wall 2 at the bonding areas a unified whole, preventing gaps and allowing for long-term storage of acidic substances such as yogurt or oily substances, thus providing acid and oil resistance.

[0018] Furthermore, the paper wall 2 has a first arc-shaped edge 201 and a second arc-shaped edge 202 distributed in the transverse direction, and a first straight edge 203 and a second straight edge 204 distributed in the longitudinal direction. An inclined edge 205 is provided at the connection between the first arc-shaped edge 204 and the first straight edge 203, and a right-angled notch 206 is provided at the connection between the second arc-shaped edge 202 and the second straight edge 204. This reduces the thickness of the composite connection area a after the flat edge 7 on the box body 11 is rolled and flattened, resulting in a smooth upper surface of the flat edge 7 and preventing local protrusions. When closed with the box lid, it maintains full contact with the lid, improving the sealing performance between the paper box body 1 and the lid. Simultaneously, it ensures the flatness of the inner wall of the box body 11 and improves the composite sealing performance with the box bottom 12.

[0019] Furthermore, the angle between the box body 11 and its central axis is 0° to 20°, preferably 6°, so that the upper edge of the box body 11 can be pushed outward. When it is closed with the lid, the flat edge 7 of the upper edge of the box body 11 is pressed by the lid and then pushed outward against the lid, which further improves the sealing between the two and facilitates demolding after the box body 11 is made.

[0020] A manufacturing process for an acid- and oil-resistant leak-proof cardboard box, comprising the following steps: 1) Cut out paper wall 2 and box bottom 12 from the material having the first coating layer 22 and the second coating layer 23 respectively; 2) Fold one side of the paper wall 2 outward in the transverse direction to form the first fold 3, and fold the other side of the paper wall 2 inward in the transverse direction to form the second fold 4; 3) Hook the first fold 3 and the second fold 4 together, and then heat press them together so that the first coating layer 22 and the second coating layer 23 are molten and mixed together, and then fixedly connected after cooling to form the box body 11; 4) Heat-press the bottom 12 of the box to the lower part of the box body 11; 5) Roll the top edge of the box 11 outwards, and then flatten and shape the rolled edge.

[0021] The manufacturing process of this acid- and oil-resistant leak-proof paper box is simple and has high production efficiency. This process can produce a paper box body with good leak-proof effect, and it is also acid- and oil-resistant. Example 2

[0022] refer to Figure 7 As shown, the design concept of this second embodiment is the same as that of the first embodiment, and its feature is that the paper box body 1 has a square structure.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. An acid and oil resistant leak resistant paper box characterized by: The box includes a paper box body, which comprises a box body and a box bottom. The box body includes a sheet-like paper wall, defined as extending laterally along its length and longitudinally along its width. One side of the paper wall in the lateral direction has an outwardly folded first fold, and the other side of the paper wall in the lateral direction has an inwardly folded second fold. The first and second folds are hooked together and connected by heat-pressing, so that the box body forms a ring structure with its ends connected. The paper wall includes a paper sheet, a first coating layer on one side of the paper sheet, and a second coating layer on the other side of the paper sheet. The box bottom is located at the lower part of the box body. The box body and the box bottom form an upward-opening cavity for holding liquid. The upper edge of the box body has an outwardly extending flat edge.

2. The acid- and oil-resistant leak-resistant paper box according to claim 1, characterized by: The paper wall has a first arc-shaped edge and a second arc-shaped edge distributed in the transverse direction, and a first straight edge and a second straight edge distributed in the longitudinal direction.

3. The acid- and oil-resistant leak-resistant paper box according to claim 2, characterized in that: An inclined edge is provided at the connection between the first arc-shaped edge and the first straight edge.

4. The acid- and oil-resistant leak-resistant paper box according to claim 2 or 3, characterized by: A right-angled notch is provided at the junction of the second arc-shaped side and the second straight side.

5. The acid- and oil-resistant leak-resistant paper box according to claim 1, characterized by: The angle between the box body and its central axis is 0° to 20°.

6. The acid- and oil-resistant leak-resistant paper box according to claim 1, characterized by: The cardboard box body has a square or circular structure.

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