Paper container and method of manufacturing and sealing the same

Abstract

The application discloses a paper container and a manufacturing method and a sealed container thereof, and a product form of the paper container and the sealed container comprises an ultra-leakage-proof paper bowl, which is combined with a side wall folding and melting technology and a bowl opening bottle plug sealing technology, can achieve a leakage-proof effect comparable to a plastic container, and is especially suitable for containing oil and water-containing food. The paper container comprises a box body, the box body comprises a bottom wall and a side wall, and the side wall and the bottom wall jointly enclose a containing space with an opening; wherein the side wall comprises a wall body and a curled edge, the wall body has a wall body non-lap joint part and a wall body lap joint part, the wall body lap joint part is located between the head and tail ends of the wall body non-lap joint part along a circumferential direction of the box body; the curled edge is located at an edge of the wall body away from the bottom wall, the curled edge comprises a curled edge non-lap joint part and a curled edge lap joint part, the curled edge lap joint part is located between the head and tail ends of the curled edge non-lap joint part along the circumferential direction of the box body, and the curled edge lap joint part has a first non-thinning area and a first thinning area. The curled edge of the paper container has a high forming rate and a long liquid leakage time.

Description

Technical Field

[0001] This application relates to the field of paper container technology, and more specifically, to a paper container, a method for manufacturing the same, and a sealed container. Background Technology

[0002] Paper containers, with their significant environmental benefits such as being manufactured from renewable resources, having low-pollution production processes, and being highly recyclable, have gradually replaced plastic boxes in packaging and other applications. However, paper containers manufactured using overlapping techniques have a lower rate of edge curling. Furthermore, after being sealed, the curled edges of paper containers are prone to leakage within a short period. Summary of the Invention

[0003] This application provides a paper container, a method for manufacturing the same, and a sealed container, wherein the paper container has a high forming rate and a long liquid leakage time.

[0004] In a first aspect, embodiments of this application provide a paper container, which includes a box body, a bottom wall and a side wall, the side wall and the bottom wall together forming an open receiving space; wherein, the side wall includes a wall body and a rolled edge, the wall body has a non-overlapping portion and an overlapping portion, the overlapping portion being located between the beginning and end of the non-overlapping portion along the circumferential direction of the box body; the rolled edge is located at the edge of the wall body away from the bottom wall, the rolled edge includes a non-overlapping portion and an overlapping portion, the overlapping portion being located between the beginning and end of the non-overlapping portion along the circumferential direction of the box body, the overlapping portion having a first non-thinning region and a first thinning region, the first non-thinning region being located between the first thinning region and the non-overlapping portion along the circumferential direction of the box body.

[0005] In the above technical solution, the sidewall has a non-overlapping portion and an overlapping portion. The overlapping portion is located between the beginning and end of the non-overlapping portion along the circumferential direction of the box. This structural design effectively reduces the risk of liquid leakage within the containment space. Simultaneously, in the rolled edge of the box, the overlapping portion has a first thinning area. This design not only helps reduce the height difference between the overlapping and non-overlapping portions but also extends the path length for liquid leakage from the overlapping portion, thereby prolonging the liquid leakage time of the rolled edge. Furthermore, the overlapping portion also has a first non-thinning area, located between the first thinning area and the non-overlapping portion along the circumferential direction of the box. This provides support for the rolled edge forming process, facilitating the forming and resulting in a higher forming rate. In summary, through the above technical solution, the rolled edge of this paper container has a high forming rate and a longer liquid leakage time.

[0006] In some embodiments of this application, the weight ratio of the first thinned region to the first non-thinned region is less than 0.9:1, optionally less than 0.7:1, or optionally (0.35~0.65):1.

[0007] In the above technical solution, by controlling the weight ratio of the first thinned area and the first non-thinned area within the above range, good structural support and strength can be provided for the edge rolling, reducing the occurrence of cracking or failure caused by local excessive thinning during molding or use, thereby significantly improving the edge rolling forming rate.

[0008] In some embodiments of this application, the weight ratio of the first thinned region to the first non-thinned region is (0.36~0.56):1.

[0009] In the above technical solution, the control of the thickness ratio allows the liquid to seep through the rolled edge for a longer time while also achieving good molding stability and reliability.

[0010] In some embodiments of this application, the width w11 of the first thinning region along the circumferential direction of the box body and the width w1 of the rolled edge overlap along the circumferential direction of the box body satisfy: 0.3≤w11 / w1≤0.75.

[0011] In some embodiments of this application, 0.3 ≤ w11 / w1 ≤ 0.6.

[0012] In the above technical solution, by controlling the ratio w11 / w1 of the width w11 of the first thinning area to the width w1 of the rolled edge overlap within the above range, the rolled edge can have a higher forming rate during the forming process, and can provide more stable and longer-lasting anti-leakage performance after sealing.

[0013] In some embodiments of this application, the basis weight of the first thinned region is 90 g / m². 2 ~164g / m 2 .

[0014] In the above technical solution, the control of the weight further improves the overall structural stability and sealing reliability of the rolled edge, thereby further extending the time for liquid leakage at the rolled edge and further improving its forming rate.

[0015] In some embodiments of this application, the basis weight of the first non-thinned region is 250 g / m². 2 ~350g / m 2 .

[0016] In the above technical solution, the basis weight of the first non-thinning area is controlled within the above range, so that the edge-rolling material has sufficient strength to support the edge-rolling structure and prolong the liquid leakage time, while maintaining good flexibility to adapt to the edge-rolling forming process, thereby significantly improving the sealing performance and production efficiency of paper containers.

[0017] In some embodiments of this application, the basis weight of the first non-thinned region is 320 g / m². 2 ~350g / m 2 Furthermore, the width w11 of the first thinning region along the circumferential direction of the box and the width w1 of the rolled edge overlap along the circumferential direction of the box satisfy: 0.3≤w11 / w1≤0.56.

[0018] In the above technical solution, by combining the first non-thinning region with the range of values ​​for the ratio w11 / w1, the synergistic optimization of the paper container edge forming and sealing performance is achieved.

[0019] In some embodiments of this application, the weight ratio of the first thinned region to the first non-thinned region is (0.4~0.56):1.

[0020] In the above technical solution, by controlling the thickness ratio of the first thinning region and the first non-thinning region within the above range, the first thinning region can provide enough material for thinning to facilitate the subsequent effective pressing of the cover and the formation of a tight seal, while still maintaining sufficient structural strength and toughness to resist stress concentration and deformation that may occur during the edge rolling and sealing process.

[0021] In some embodiments of this application, the basis weight of the first thinned region is 128 g / m². 2 ~164g / m 2 .

[0022] In the above technical solution, the control of the thickness can effectively prolong the leakage time of liquid through the thinned area, and ensure that the rolled edge is not easily deformed or damaged when subjected to external pressure, thereby significantly improving the sealing performance and overall reliability of the paper container, and increasing the forming rate of the rolled edge.

[0023] In some embodiments of this application, the basis weight of the first non-thinned region is greater than or equal to 250 g / m². 2 And less than 320g / m 2 The weight ratio of the first thinned region to the first non-thinned region is (0.36~0.5):1.

[0024] In the above technical solution, the control of the weight of the first non-thinning region and its weight ratio with that of the first thinning region can significantly improve the forming rate and sealing performance of the rolled edge, thereby effectively extending the liquid leakage time at the rolled edge and improving production efficiency.

[0025] In some embodiments of this application, the basis weight of the first thinned region is 90 g / m². 2 ~125g / m 2 .

[0026] In the above technical solution, the control of the thickness can significantly improve the forming rate of the rolled edge and ensure the long-term reliability of the rolled edge after sealing, thereby effectively extending the liquid leakage time at the rolled edge.

[0027] In some embodiments of this application, the rolled edge overlap includes a first layer of paper and a second layer of paper that are overlapped and connected, wherein the first layer of paper is close to the winding axis of the rolled edge, and the first thinned area and the first non-thinned area are located on the second layer of paper.

[0028] In some embodiments of this application, the first thinning region is recessed inward along the axial direction of the box body, facing the surface of the second paper layer.

[0029] In the above technical solution, the concave design allows the sealing medium to better fill the tiny gaps at the overlapping interface, forming a tighter and more durable sealing effect, thereby significantly improving the sealing performance of the paper container edge and effectively extending the liquid leakage time at the edge overlap.

[0030] In some embodiments of this application, the compaction density of the rolled edge overlap is greater than that of the rolled edge non-overlap.

[0031] In the above technical solution, the compaction density of the rolled edge overlap and the rolled edge non-overlap meets the above relationship, which can help reduce the gaps in the rolled edge overlap, thereby further extending the liquid leakage time of the rolled edge.

[0032] In some embodiments of this application, the compaction density of the first thinned region is greater than the compaction density of the first non-thinned region.

[0033] In some embodiments of this application, the first layer of paper has a thinned area and a non-thinned area, the non-thinned area being connected between the thinned area and the non-overlapping edge portion, wherein the thinned area is disposed opposite to the first thinning area.

[0034] In the above technical solution, the setting of the thinning area can further reduce the gap inside the rolled edge overlap, thereby helping to prolong the liquid leakage time of the rolled edge.

[0035] In some embodiments of this application, the compaction density of the thinned region is greater than that of the non-thinned region.

[0036] In some embodiments of this application, the first layer of paper also has a transition region that connects the non-thinned region and the thinned region, and the compaction density of the transition region is greater than the compaction density of the non-thinned region but less than the compaction density of the thinned region.

[0037] In some embodiments of this application, the curvature of the rolled edge is 180°~540°.

[0038] In the above technical solution, the curvature of the rolled edge is within the above range, which is beneficial to improving the deformation resistance of the rolled edge and the sealing effect after it is matched with the cover.

[0039] In some embodiments of this application, the wall overlap includes a wall overlap bottom layer, a folded area, and a leak-proof layer, wherein the leak-proof layer is located between the wall overlap bottom layer and the folded area.

[0040] In the above technical solution, the structural design of the wall overlap can help reduce the risk of liquid leakage at the wall overlap.

[0041] In some embodiments of this application, the folded region includes a folded layer and a thinning layer, wherein the folded layer is located between the wall overlap bottom layer and the thinning layer, wherein the folded layer is overlapped and connected to the wall overlap bottom layer, the thinning layer is folded and disposed with the folded layer, and the anti-leakage layer is located between the wall overlap bottom layer and the folded layer, and extends from between the wall overlap bottom layer and the folded layer to the surface of the thinning layer away from the folded layer.

[0042] In the above technical solution, the structural design of the folded area helps to further reduce the occurrence of liquid leakage in the wall.

[0043] In some embodiments of this application, the first thinning region is disposed opposite to the folded layer and the thinning layer, and the basis weight of the first thinning region is equal to the basis weight of the folded layer; and / or, the basis weight of the first thinning region is equal to the basis weight of the thinning layer.

[0044] In some embodiments of this application, the width of the folded region along the circumferential direction of the box body is greater than or equal to the width of the first thinning region along the circumferential direction of the box body; or, the width of the folded region along the circumferential direction of the box body is less than the width of the first thinning region along the circumferential direction of the box body.

[0045] In some embodiments of this application, the wall overlap portion further includes a non-folded region. Along the circumferential direction of the box, the non-folded region is located between the folded region and the non-overlapping portion of the wall, and the thickness of the folded region is less than or equal to the thickness of the non-folded region.

[0046] In the above technical solution, controlling the thickness of the folded area to be less than or equal to the thickness of the non-folded area can reduce the height difference between the wall overlap and the non-overlapping part, thereby effectively reducing the possibility of liquid leakage from the side wall.

[0047] In some embodiments of this application, the weight of the folded region is less than the weight of the non-folded region.

[0048] In some embodiments of this application, the basis weight of the folded layer is less than that of the non-folded region; and / or, the basis weight of the thinned layer is less than that of the non-folded region.

[0049] Secondly, embodiments of this application provide a method for manufacturing a paper container, the method comprising: Provide side wallpaper blanks, which include a wall area and a rolled edge area; The curled edge area is thinned to form the first thinning area, resulting in the wallpaper blank to be overlapped. The opposite edges of the wallpaper blank to be overlapped are overlapped to form a tube; The bottom wallpaper blank is glued to one end of the tube to form an open receiving space; The other end of the cylinder is rolled to obtain a paper container, wherein the paper container includes a box body, the box body includes a bottom wall and a side wall, the side wall and the bottom wall together enclose an open receiving space; wherein the side wall includes a wall body and a rolled edge, the wall body has a non-overlapping part and an overlapping part, the overlapping part of the wall body is located between the beginning and end of the non-overlapping part of the wall body along the circumferential direction of the box body; the rolled edge is located at the edge of the wall body away from the bottom wall, the rolled edge includes a non-overlapping part and an overlapping part, the overlapping part of the rolled edge is located between the beginning and end of the non-overlapping part of the rolled edge along the circumferential direction of the box body, the overlapping part of the rolled edge has a first non-thinning region and a first thinning region, the first non-thinning region is located between the first thinning region and the non-overlapping part of the rolled edge along the circumferential direction of the box body.

[0050] In some embodiments of this application, the thinning process is a shaving process.

[0051] In the above technical solution, the thinning process can help reduce the height difference of the rolled edge overlap and maintain this height difference during use, thereby helping to extend the liquid leakage time of the rolled edge.

[0052] In some embodiments of this application, the method further includes: thinning the overlapping portion of the wall region so that the second thinned region formed in the wall region is disposed opposite to the first thinned region.

[0053] In some embodiments of this application, the method further includes: trimming the rolled edge area so that the width of the first thinned area is smaller than the width of the second thinned area.

[0054] In the above technical solution, the above cutting process is beneficial for edge forming and improving the structural strength of the edge overlap.

[0055] In some embodiments of this application, the overlap pressure of the rolled edge region is greater than the overlap pressure of the wall region.

[0056] Thirdly, embodiments of this application provide a sealed container, which includes a paper container as described in any of the above embodiments or a paper container prepared by the manufacturing method described in any of the above embodiments, and a cover for interference fit with the opening to seal the paper container.

[0057] In the above technical solution, since the sealed container includes the paper container in the above embodiment, the sealed container has good sealing reliability.

[0058] In some embodiments of this application, the cover has a protrusion for interference fit with the inner wall of the paper container.

[0059] In some embodiments of this application, the cover has an annular groove that mates with the rolled edge.

[0060] In the above technical solution, the design of the annular groove can significantly improve the sealing performance of the sealed container and effectively prevent liquid from leaking from the opening of the containment space.

[0061] In some embodiments of this application, the inner wall of the annular groove has an arc-shaped structure, and the curvature of the arc-shaped structure matches the curvature of the rolled edge.

[0062] In the above technical solution, the arc-shaped structure design establishes a highly consistent sealing interface between the lid and the rolled edge of the paper container. Furthermore, the matching curvature ensures that the annular groove can fully and uniformly cover the rolled edge, eliminating any micro-gaps or uneven stress areas that might result from shape mismatch. Therefore, during the sealing process, liquid leakage from the rolled edge is effectively prevented, significantly improving the reliability and durability of the seal.

[0063] In some embodiments of this application, the arc of the arc structure is greater than or equal to 180°.

[0064] In the above technical solution, the curvature design allows the lid to fit more tightly and comprehensively against the rolled edge of the paper container, forming a stronger clamping force. This effectively reduces gaps that may occur due to insufficient curvature, thereby significantly reducing the possibility of liquid leakage and improving the overall sealing performance and reliability of the sealed container. Attached Figure Description

[0065] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This is a schematic diagram of the structure of a paper container provided in some embodiments of this application.

[0067] Figure 2 This is a schematic cross-sectional view of the rolled edge structure in a paper container provided in some embodiments of this application.

[0068] Figure 3 This is a plan view of the paper on the sidewalls of a paper container provided in some embodiments of this application before the folded areas are formed.

[0069] Figure 4 for Figure 3 A plan view showing the unfolded state of the folded area formed in the middle sidewall.

[0070] Figure 5 This is a plan view of the paper on the sidewalls of a paper container provided in some other embodiments of this application before the folded areas are formed.

[0071] Figure 6 for Figure 5 A plan view showing the unfolded state of the folded area formed in the middle sidewall.

[0072] Figure 7 This is a cross-sectional structural diagram of the wall overlap portion of a paper container provided in some embodiments of this application.

[0073] Figure 8 This is a cross-sectional structural diagram of a paper container provided in some embodiments of this application.

[0074] Figure 9 for Figure 8 A magnified view of part A in the image.

[0075] Figure 10 This is a schematic diagram of the structure of a sealed container provided in some embodiments of this application.

[0076] icon: 1-Sealed container; 10 - Paper containers; 100 - Box body; 1000-bottom wall; 2000-Sidewall, 2100-Wall body, 2110-Wall body overlap, 2111-Wall body overlap bottom layer, 2112-Folded area, 2112a-Folded layer, 2112b-Thinning layer, 2113-Leak-proof layer, 2114-Non-Folded area, 2120-Wall body non-overlapping part, 2200-Curled edge, 2210-Curled edge overlap, 2211-First layer of paper, 2211a-Thinned area, 2211b-Non-Thinned area, 2211c-Transition area, 2212-Second layer of paper, 2212a-First thinning area, 2212b-First non-thinning area, 2220-Curled edge non-overlapping part; 3000 - Capacity space; 20-Cover body, 21-Protrusion, 211-Contact surface. Detailed Implementation

[0077] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the description of this application and the foregoing drawings are intended to cover non-exclusive inclusion.

[0079] The terms "first," "second," etc., used in the specification or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0080] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0081] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0082] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0083] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0084] Paper containers are made from renewable pulp, resulting in low energy consumption and low pollutant emissions during production. They are also easily recycled and reused after disposal, offering significant environmental advantages. Therefore, they are gradually replacing plastic products in applications such as food packaging and beverage containers. However, current paper container manufacturing processes using overlapping techniques result in a low roll forming rate. Furthermore, after sealing, the rolled edges are prone to liquid leakage within a short period, especially when containing liquid contents. This leakage leads to loss of contents and potential environmental contamination, severely impacting product sealing performance and user experience.

[0085] In view of this, the present application provides a paper container, a method for manufacturing the same, and a sealed container, wherein the paper container has a high forming rate and a long liquid leakage time.

[0086] [Paper Container] Firstly, please refer to Figure 1 and Figure 2 As shown, this application provides a paper container 10, which includes a box body 100. The box body 100 includes a bottom wall 1000 and a side wall 2100, which together form an open receiving space. The side wall 2000 includes a side wall 2100 and a rolled edge 2200. The side wall 2100 has a non-overlapping portion 2120 and an overlapping portion 2110. The overlapping portion 2110 is located between the beginning and end of the non-overlapping portion 2120 along the circumferential direction of the box body 100. The rolled edge 2200... 200 is located at the edge of the wall 2100 away from the bottom wall 1000. The rolled edge 2200 includes a rolled edge non-overlapping portion 2220 and a rolled edge overlapping portion 2210. The rolled edge overlapping portion 2210 is located between the beginning and end ends of the rolled edge non-overlapping portion 2220 along the circumferential direction of the box body 100. The rolled edge overlapping portion 2210 has a first non-thinning region 2212b and a first thinning region 2212a. The first non-thinning region 2212b is located between the first thinning region 2212a and the rolled edge non-overlapping portion 2220 along the circumferential direction of the box body 100.

[0087] In this document, the box body 100 of the paper container 10 can be made of single or multiple layers of cardboard material, formed through processes such as folding and gluing. The bottom wall 1000 can be a flat circular, square, or polygonal structure, and the wall 2100 can extend upward perpendicularly to the bottom wall 1000 to form an open container in the shape of a cylinder, square column, or other shapes. Thus, the containing space is defined.

[0088] In this document, within the receiving space, the wall 2100 has a non-overlapping portion 2120 and an overlapping portion 2110. The non-overlapping portion 2120 can maintain the original structure of the wall 2100, while the overlapping portion 2110 can be formed by overlapping, bonding, or folding a portion of the wall 2100. The overlapping portion 2110 is located between the beginning and end of the non-overlapping portion 2120 along the circumferential direction of the box 100. The overlapping portion 2110 can be aligned with the rolled edge overlapping portion 2210 in the circumferential direction of the box 100. For example, when viewed from the top of the box 100, the overlapping portion 2110 can be located directly below or in the same radial plane as the rolled edge overlapping portion 2210. This relative arrangement can be achieved through mold design and molding process.

[0089] In this document, the edge of the wall 2100 away from the bottom wall 1000 can be rolled outward or inward to form a rolled edge 2200. A portion of this rolled edge can serve as a non-overlapping portion 2220, maintaining the original cardboard thickness; another portion can serve as an overlapping portion 2210, formed by overlapping or gluing. This overlapping portion 2210 is located between the beginning and end of the non-overlapping portion 2220 along the circumferential direction of the box body 100.

[0090] In this document, the circumferential direction of the housing 100 refers to the direction tangent to any circle centered on the central axis of the housing 100. This direction is perpendicular to both the axial and radial directions, such as... Figure 1 The direction indicated by Z in the middle.

[0091] The paper container 10 provided in this application has a wall 2100 that includes a non-overlapping portion 2120 and an overlapping portion 2110. The overlapping portion 2110 is located between the beginning and end of the non-overlapping portion 2120 along the circumferential direction of the container 100. This structural design effectively reduces the risk of liquid leakage within the container space. Simultaneously, in the rolled edge 2200 of the container 100, the rolled edge overlapping portion 2210 has a first thinning region 2212a. This design not only helps to reduce the height difference between the rolled edge overlapping portion 2210 and the non-overlapping portion 2220, but also extends the path length for liquid leakage from the rolled edge overlapping portion, thereby extending the liquid leakage time of the rolled edge 2200. Furthermore, the rolled edge overlap 2210 also has a first non-thinning region 2212b, which is located between the first thinning region 2212a and the rolled edge non-overlap 2220 along the circumferential direction of the box body 100. This provides support for the forming process of the rolled edge 2200, which is beneficial to the forming of the rolled edge 2200, thus giving the rolled edge 2200 a high forming rate. In summary, through the above technical solution, the rolled edge 2200 of the paper container 10 has a high forming rate and a long liquid leakage time.

[0092] In some embodiments, the weight ratio of the first thinned region 2212a to the first non-thinned region 2212b is less than 0.9:1, and can be less than 0.7:1, or can be (0.35~0.65):1.

[0093] In this document, the weight ratio of the first thinned region 2212a and the first non-thinned region 2212b refers to the weight ratio of the first thinned region 2212a that has undergone thinning treatment to the first non-thinned region 2212b that has not undergone thinning treatment in the rolled edge overlap 2210.

[0094] In the above embodiments, by controlling the weight of the first thinning region 2212a and the first non-thinning region 2212b within the above range, good structural support and strength can be provided for the rolled edge 2200, and the occurrence of cracking or failure caused by local excessive thinning during molding or use can be reduced, which can significantly improve the molding rate of the rolled edge 2200.

[0095] In some embodiments, the weight ratio of the first thinned region 2212a to the first non-thinned region 2212b is (0.36~0.56):1.

[0096] In the above embodiment, by controlling the weight ratio of the first thinned region 2212a to the first non-thinned region 2212b within the range of (0.36~0.56):1, the first thinned region 2212a can maintain good flexibility, allowing it to deform sufficiently and fit tightly during the overlapping and sealing process of the rolled edge 2200, thereby forming a reliable sealing structure and effectively extending the time for liquid to leak from the rolled edge overlap 2210. Simultaneously, the first non-thinned region 2212b retains sufficient thickness, providing necessary structural support and strength for the entire rolled edge 2200, reducing the occurrence of cracking or failure due to localized thinning during molding or use. Therefore, the control of the thickness ratio allows for both extended liquid leakage time within the rolled edge 2200 and good molding stability and reliability.

[0097] One way to achieve this basis weight ratio is to remove material from specific areas of the paper material during the manufacturing process of the paper container 10, before the paper container 10 is formed, through a localized grinding process, thereby forming a first thinned region 2212a. It is important to note that, per unit area, the basis weight ratio between the thinned region and the non-thinned region is equivalent to the thickness ratio between the thinned region and the non-thinned region. Therefore, the degree of grinding can be preset and adjusted according to the original thickness of the paper material to ensure that the thickness ratio of the first thinned region 2212a to the thickness ratio of the first non-thinned region 2212b is within the aforementioned basis weight ratio range.

[0098] For example, the weight ratio of the first thinned region 2212a and the first non-thinned region 2212b may be, but is not limited to, 0.36:1, 0.37:1, 0.38:1, 0.39:1, 0.4:1, 0.41:1, 0.42:1, 0.43:1, 0.44:1, 0.45:1, 0.46:1, 0.47:1, 0.48:1, 0.49:1, 0.5:1, 0.51:1, 0.52:1, 0.53:1, 0.54:1, 0.55:1, 0.56:1, etc.

[0099] In some embodiments, the width w11 of the first thinning region 2212a along the circumferential direction of the box body 100 and the width w1 of the rolled edge overlap portion 2210 along the circumferential direction of the box body 100 satisfy: 0.3≤w11 / w1≤0.75.

[0100] In this document, the circumferential width of the first thinning region 2212a refers to the dimension of the first thinning region 2212a in the circumferential direction of the housing 100, such as... Figure 2 The width w11 indicated by the middle arrow; the circumferential width of the rolled edge overlap 2210 refers to the circumferential dimension of the rolled edge overlap 2210 on the box body 100, such as... Figure 2 The width w1 is indicated by the middle arrow.

[0101] In this document, the ratio w11 / w1 between the width w11 of the first thinning region 2212a along the circumferential direction of the box body 100 and the width w1 of the rolled edge overlap 2210 along the circumferential direction of the box body 100 can be understood as the proportion of the area in the rolled edge overlap 2210 that undergoes thinning treatment. This ratio can be achieved in various ways. For example, during the manufacturing process of the paper container 10, the area where the rolled edge overlap 2210 is to be formed can be locally pre-treated, for example by grinding or chemical treatment, so that the area naturally forms a thinning region with the required width ratio during subsequent forming.

[0102] For example, the ratio w11 / w1 can be, but is not limited to, a range of values ​​consisting of 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or any two of the above values.

[0103] In embodiments of this application, the forming rate of the rolled edge 2200 can be improved by further adjusting the ratio of w11 / w1.

[0104] In some embodiments, the width w11 of the first thinning region 2212a along the circumferential direction of the box body 100 and the width w1 of the rolled edge overlap portion 2210 along the circumferential direction of the box body 100 satisfy: 0.3≤w11 / w2≤0.6.

[0105] In the above embodiment, controlling the ratio w11 / w1 of the width w11 of the first thinning region 2212a to the width w1 of the rolled edge overlap 2210 within the aforementioned range not only facilitates the thinning effect of the first thinning region 2212a, promoting the smooth forming and tight fit of the rolled edge 2200, but also maintains sufficient structural strength. This results in a higher success rate for the rolled edge 2200 during the forming process and provides more stable and durable leak-proof performance after sealing.

[0106] For example, the ratio w11 / w1 between the width w11 of the first thinning region 2212a along the circumferential direction of the box body 100 and the width w1 of the rolled edge overlap portion 2210 along the circumferential direction of the box body 100 can be, but is not limited to, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc.

[0107] In some embodiments, the weight ratio of the first thinned region 2212a to the first non-thinned region 2212b is (0.4~0.56):1.

[0108] In the above embodiments, further controlling the basis weight ratio of the first thinned region 2212a and the first non-thinned region 2212b within the aforementioned range can effectively resist tensile and shear stresses during the molding process, reduce the occurrence of tearing or microcracks, and thus improve the structural stability of the rolled edge 2200. Simultaneously, the first thinned region 2212a has sufficient thinness, allowing it to deform more smoothly when the rolled edge 2200 is bent, reducing material accumulation and stress concentration, thereby promoting the formation of a denser and more uniform rolled edge 2200 structure. Therefore, controlling the aforementioned thickness ratio can further prolong the time for liquid to seep into the rolled edge 2200 and improve the molding rate of the rolled edge 2200.

[0109] Furthermore, in some embodiments, the basis weight of the first thinning region 2212a is 90 g / m². 2 ~164g / m 2 .

[0110] In the above embodiment, the weight of the first thinned region 2212a is controlled within the aforementioned range, ensuring that the first thinned region 2212a possesses sufficient flexibility for bending during the forming process of the edge curling 2200, while maintaining good material strength, thus reducing the probability of breakage during processing or use. Therefore, the aforementioned thickness control further enhances the overall structural stability and sealing reliability of the edge curling 2200, thereby further extending the time for liquid leakage at the edge curling 2200 and further improving its forming rate.

[0111] For example, the basis weight of the first thinning region 2212a may be, but is not limited to, 90 g / m². 2、91g / m 2 、92g / m 2 、93g / m 2 、94g / m 2 、95g / m 2 、96g / m 2 、97g / m 2 、98g / m 2 、99g / m 2 、100g / m 2 、101g / m 2 、102g / m 2 、103g / m 2 、104g / m 2 、105g / m 2 、106g / m 2 、107g / m 2 、108g / m 2 、109g / m 2 、110g / m 2 、111g / m 2 、112g / m 2 、113g / m 2 、114g / m 2 、115g / m 2 、116g / m 2 、117g / m 2 、118g / m 2 、119g / m 2 、120g / m 2 、121g / m 2 、122g / m 2 、123g / m 2 、124g / m 2 、125g / m 2 、126g / m 2 、127g / m 2 、128g / m 2 、129g / m 2 、130g / m 2 、131g / m 2 、132g / m 2 、133g / m 2 、134g / m 2 、135g / m 2 、136g / m 2 、137g / m 2 、138g / m 2 、139g / m 2 、140g / m 2 、141g / m2 142g / m 2 143g / m 2 144g / m 2 145g / m 2 146g / m 2 147g / m 2 148g / m 2 149g / m 2 150g / m 2 151g / m 2 152g / m 2 153g / m 2 154g / m 2 155g / m 2 156g / m 2 157g / m 2 158g / m 2 159g / m 2 160g / m 2 161g / m 2 162g / m 2 163g / m 2 164g / m 2 Or the range of values ​​formed by any two of the above values.

[0112] In embodiments of this application, the liquid leakage time at the rolled edge 2200 and the forming rate of the rolled edge 2200 can be further extended by adjusting the weight of the first non-thinning region 2212b.

[0113] In some embodiments, the basis weight of the first non-thinned region 2212b is 250 g / m². 2 ~350g / m 2 .

[0114] In this article, the basis weight of the first non-thinning region 2212b refers to the mass of paper per unit area, typically expressed in grams per square meter (g / m²). 2 The basis weight of the first non-thinning region 2212b can be measured using methods and instruments well known in the art. For example, it can be tested according to the national standard GB / T 451.2-1989 "Determination of basis weight of paper and paperboard", and the specific test method includes: taking at least 5 samples with an area of ​​25 cm² from the first non-thinning region 2212b of the paper container 10. 2 The circular samples were weighed using an analytical balance to obtain the average mass m of each sample. Therefore, the weight of the wall material 2100 is (m / 0.0025) g / m. 2 .

[0115] In the above embodiment, the basis weight of the first non-thinning region 2212b is controlled at 250 g / m². 2 ~350g / m 2 Within a certain range, the edge-curling material 2200 has sufficient strength to support the edge-curling structure and extend the time of liquid leakage, while maintaining good flexibility to adapt to the edge-curling molding process, thereby significantly improving the sealing performance and production efficiency of the paper container 10.

[0116] For example, the basis weight of the first non-thinned region 2212b may be, but is not limited to, 250 g / m². 2 260g / m 2 270g / m 2 280g / m 2 290g / m 2 300g / m 2 310g / m 2 320g / m 2 330g / m 2 340g / m 2 350g / m 2 Or the range of values ​​formed by any two of the above values.

[0117] In embodiments of this application, the liquid leakage time at the edge 2200 and the forming rate of the edge 2200 can be further extended by combining the weight of the first non-thinning region 2212b with the features of the edge 2200.

[0118] In some embodiments, the basis weight of the first non-thinned region 2212b is 320 g / m². 2 ~350g / m 2 Furthermore, the width w11 of the first thinning region 2212a along the circumferential direction of the box body 100 and the width w1 of the rolled edge overlap portion 2210 along the circumferential direction of the box body 100 satisfy: 0.3≤w11 / w1≤0.56.

[0119] In the above embodiment, the basis weight of the first non-thinning region 2212b is controlled at 320 g / m². 2 ~350g / m 2Within the specified range, the paper container 10 can possess good rigidity and resistance to deformation. Simultaneously, by controlling the ratio w11 / w1 of the width w11 of the first thinning region 2212a to the width w1 of the crimp overlap 2210 within the aforementioned range, even with a high overall basis weight of the wall 2100, the crimp 2200 can still provide the necessary local flexibility. This synergistic effect allows the crimp 2200 to bend and compress more smoothly during the forming process, thereby improving the forming rate of the crimp 2200. Furthermore, the aforementioned ratio w11 / w1 allows the crimp overlap 2210 to better fit with the lid during sealing, forming a tighter and more uniform sealing contact, further extending the time for liquid leakage at the crimp 2200. Therefore, this application achieves synergistic optimization of the forming and sealing performance of the crimp 2200 of the paper container 10 by combining a high basis weight wall 2100 with the aforementioned range of values ​​for the ratio w11 / w1.

[0120] For example, the weight of wall 2100 is 320 g / m². 2 w11 / w1 can be 0.3, 0.35, etc. For example, the basis weight of wall 2100 is 350 g / m². 2 w11 / w1 can be 0.35, 0.5, etc.

[0121] In some embodiments, the weight ratio of the first thinned region 2212a to the first non-thinned region 2212b is (0.42~0.5):1.

[0122] In the above embodiment, when the basis weight of the first non-thinning region 2212b is 320 g / m² 2 ~350g / m 2 Within the specified range, by controlling the weight ratio of the first thinned region 2212a and the first non-thinned region 2212b to be within the range of (0.44~0.56):1, the first thinned region 2212a can provide sufficient material for thinning to facilitate the effective pressing of subsequent sealing components (such as the cover) and the formation of a tight seal, while still maintaining sufficient structural strength and toughness to resist stress concentration and deformation that may occur during the forming and sealing process of the edge rolling 2200.

[0123] Furthermore, in some embodiments, the basis weight of the first thinned region 2212a is 128 g / m². 2 ~164g / m 2 .

[0124] In the above embodiments, the basis weight of the first thinning region 2212a is controlled within the aforementioned range, ensuring that the first thinning region 2212a possesses suitable flexibility while maintaining sufficient material strength. This not only greatly facilitates the curling operation of the edge 2200 during the forming process, reducing forming difficulties or paper damage caused by excessive material thickness, but also ensures the structural stability of the edge 2200 in a sealed state. Appropriate thickness effectively prolongs the leakage time of liquid through the thinning region and ensures that the edge 2200 is not easily deformed or damaged under external pressure, thereby significantly improving the sealing performance and overall reliability of the paper container 10, and increasing the forming rate of the edge 2200.

[0125] For example, the basis weight of the first thinning region 2212a may be, but is not limited to, 128 g / m². 2 129g / m 2 130g / m 2 131g / m 2 132g / m 2 133g / m 2 134g / m 2 135g / m 2 136g / m 2 137g / m 2 138g / m 2 139g / m 2 140g / m 2 141g / m 2 142g / m 2 143g / m 2 144g / m 2 145g / m 2 146g / m 2 147g / m 2 148g / m 2 149g / m 2 150g / m 2 151g / m 2 152g / m 2 153g / m 2 154g / m 2 155g / m 2 156g / m 2 157g / m 2 158g / m 2 159g / m 2 160g / m 2 161g / m 2 162g / m 2 163g / m 2164g / m 2 wait.

[0126] In other embodiments, the basis weight of the first non-thinned region 2212b is greater than or equal to 250 g / m². 2 And less than 320g / m 2 The weight ratio of the first thinned region 2212a to the first non-thinned region 2212b is (0.36~0.5):1.

[0127] In the above embodiments, controlling the basis weight of the first non-thinning region 2212b within the aforementioned range is beneficial for the lightweighting of the paper container 10. Furthermore, controlling the basis weight ratio of the first thinning region 2212a to the first non-thinning region 2212b within the aforementioned range ensures that the first thinning region 2212a maintains sufficient flexibility while allowing for controllable folding and bending, thereby ensuring the smoothness and uniformity of the edge-rolling process 2200. Simultaneously, the first non-thinning region 2212b provides good structural support, guaranteeing the overall strength and sealing integrity of the edge-rolling 2200. Therefore, controlling the basis weight of the first non-thinning region 2212b and its ratio to the first thinning region 2212a can significantly improve the forming rate and sealing performance of the edge-rolling 2200, effectively extending the liquid leakage time at the edge-rolling 2200 and improving production efficiency.

[0128] Furthermore, the basis weight of the first thinning region 2212a is 90 g / m². 2 ~125g / m 2 .

[0129] In the above embodiment, the basis weight of the first non-thinning region 2212b is greater than or equal to 250 g / m². 2 And less than 320g / m 2 Under the premise of controlling the basis weight of the first thinning region 2212a to 90 g / m², 2 ~125g / m 2 Within a certain range, the first thinned region 2212a can possess appropriate flexibility and strength during the forming process of the edge curling 2200. This ensures that the first thinned region 2212a will not suffer from insufficient material strength and easy breakage due to excessive weight, thus effectively extending the liquid leakage time; nor will it affect the forming rate and sealing effect of the edge curling 2200 due to excessive weight. Therefore, the above solution can significantly improve the forming rate of the edge curling 2200 and ensure the long-term reliability of the edge curling 2200 after sealing, thereby effectively extending the liquid leakage time at the edge curling 2200.

[0130] For example, the basis weight of the first thinning region 2212a may be, but is not limited to, 90 g / m². 2 91g / m2 92g / m 2 93g / m 2 94g / m 2 95g / m 2 96g / m 2 97g / m 2 98g / m 2 99g / m 2 100g / m 2 101g / m 2 102g / m 2 103g / m 2 104g / m 2 105g / m 2 106g / m 2 107g / m 2 108g / m 2 109g / m 2 110g / m 2 111g / m 2 112g / m 2 113g / m 2 114g / m 2 115g / m 2 116g / m 2 117g / m 2 118g / m 2 119g / m 2 120g / m 2 121g / m 2 122g / m 2 123g / m 2 124g / m 2 125g / m 2 wait.

[0131] Please continue reading. Figure 2 As shown, in some embodiments, the rolled edge overlap portion 2210 includes a first layer of paper 2211 and a second layer of paper 2212 that are overlapped, wherein the first layer of paper 2211 is close to the winding axis of the rolled edge 2200, and the first thinning region 2212a and the first non-thinning region 2212b are located on the second layer of paper 2212.

[0132] In this article, overlapping refers to the secure bonding of two layers of paper together in some way. This bonding method can be achieved using various techniques. For example, it can be achieved by applying an adhesive (such as food-grade glue or hot melt adhesive) between the two layers and applying pressure to ensure a tight fit and a stable overlapping structure. Alternatively, for paper with a thermoplastic coating, hot pressing or ultrasonic welding can be used to melt and fuse the coating together, thus achieving a strong connection. This layered overlapping structure provides a basis for subsequent thinning and recess design, ensuring the overall strength and stability of the overlapping area.

[0133] In this paper, the second paper layer 2212 has a first thinning region 2212a, which means that when forming the first thinning region 2212a, only the second paper layer 2212 is thinned, while the first paper layer 2211 retains its original thickness or is not thinned. This local thinning can be achieved in various ways, for example, after the paper layer is formed, by locally grinding or laser ablation, etc., to precisely remove material from a specific area of ​​the first paper layer 2211 to achieve the preset thinning effect.

[0134] In this document, the second layer of paper 2212 may include a first non-thinning region 2212b with a consistent thickness and a first thinning region 2212a with a thickness less than the first non-thinning region 2212b. The first non-thinning region 2212b can maintain the original thickness of the paperboard, while the first thinning region 2212a can have its thickness reduced by means of grinding or chemical treatment. The first non-thinning region 2212b is located between the first thinning region 2212a and the non-overlapping edge portion 2220 along the circumferential direction of the box body 100.

[0135] In some embodiments, the surface of the first thinning region 2212a facing the second paper sheet 2212 is recessed in the axial direction of the box body 100.

[0136] In this paper, the recessed opening faces the second paper layer 2212, which means that when the first paper layer 2211 and the second paper layer 2212 are overlapped, the open side of the recessed structure directly faces and contacts the surface of the second paper layer 2212.

[0137] In the above embodiment, the first thinning region 2212a is recessed, with its opening facing the second paper layer 2212. When the two paper layers overlap, this recess forms an effective storage space for a sealing medium (such as glue, coating, or paper). When the sealing medium fills this recess, it can form a thicker, more continuous sealing layer, significantly increasing the path resistance for liquid penetration. This structural design allows the sealing medium to better fill the tiny gaps at the overlap interface, forming a tighter and more durable seal, thereby significantly improving the sealing performance of the paper container 10 edge curl 2200 and effectively extending the liquid leakage time at the edge overlap 2210 in the edge curl 2200.

[0138] In some embodiments, the compaction density of the rolled edge overlap 2210 is greater than that of the rolled edge non-overlap 2220. The compaction densities of the rolled edge overlap 2210 and the rolled edge non-overlap 2220 satisfy the above relationship, which can help reduce the gaps in the rolled edge overlap 2210, thereby further extending the liquid leakage time of the rolled edge 2200.

[0139] In some embodiments, the compaction density of the first thinned region 2212a is greater than the compaction density of the first non-thinned region 2212b.

[0140] In some embodiments, the first paper layer 2211 has a thinning region 2211a and a non-thinning region 2211b, the non-thinning region 2211b being connected between the thinning region 2211a and the non-overlapping edge portion 2220, wherein the thinning region 2211a is disposed opposite to the first thinning region 2212a.

[0141] In the above embodiment, the setting of the thinning area 2211a can further reduce the gap inside the rolled edge overlap 2210, thereby helping to extend the liquid leakage time of the rolled edge 2200.

[0142] In some embodiments, the compaction density of the thinned region 2211a is greater than the compaction density of the non-thinned region 2212b.

[0143] In some embodiments, the first paper layer 2211 further has a transition region 2211c, which connects the non-thinned region 2211b and the thinned region, and the compaction density of the transition region 2211c is greater than the compaction density of the non-thinned region 2211b and less than the compaction density of the thinned region 2211a.

[0144] Please see Figure 3 and Figure 4 As shown, in some embodiments, the curvature of the rolled edge 2200 is 180° to 540°.

[0145] In this article, the curvature of the 2200mm rolled edge is as follows: Figure 4In the figure, 'a' represents the angle, and the curvature of the rolled edge refers to the sum of the curvature of the complete 360° roll and the curvature of the incomplete roll within the rolled edge.

[0146] In the above embodiments, the curvature of the rolled edge 2200 is within the above range, which is beneficial to improving the deformation resistance of the rolled edge 2200 and the sealing effect after it is fitted with the cover.

[0147] For example, the curvature of the rolled edge 2200 may be, but is not limited to, 180°, 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, 280°, 290°, 300°, 30°, 320°, 330°, 340°, 350°, 360°, 370°, 380°, 390°, 400°, 410°, 420°, 430°, 440°, 450°, 460°, 470°, 480°, 490°, 500°, 510°, 520°, 530°, 540°, or a range of any two of the above values.

[0148] Please see Figure 5 As shown, in some embodiments, the wall overlap 2110 includes a wall overlap bottom layer 2111, a folded area 2112, and a leak-proof layer 2113, wherein the leak-proof layer 2113 is located between the wall overlap bottom layer 2111 and the folded area 2112.

[0149] In the above embodiment, the anti-leakage layer 2113 is located between the bottom layer of the wall overlap 2111 and the folded area 2112, which can reduce the risk of liquid leakage at the wall overlap 2110, thereby improving the overall sealing performance and service life of the paper container 10.

[0150] In some embodiments, the folded region 2112 includes a folded layer 2112a and a thinning layer 2112b, wherein the folded layer 2112a is located between the wall overlap base layer 2111 and the thinning layer 2112b, wherein the folded layer 2112a overlaps and is connected to the wall overlap base layer 2111, the thinning layer 2112b is folded and disposed with the folded layer 2112a, and the leak-proof layer 2113 is located between the wall overlap base layer 2111 and the folded layer 2112a, and extends from between the wall overlap base layer 2111 and the folded layer 2112a to the surface of the thinning layer 2112b away from the folded layer 2112a.

[0151] In this paper, the folded layer 2112a and the thinning layer 2112b are folded along the thickness direction of the wall 2100, meaning they are folded along the thickness direction of the wall 2100. The corresponding portions of the cardboard can be folded inwards or outwards using a robotic arm or die to increase the number of layers in the thickness direction; alternatively, pre-crimping and subsequent pressing operations can create a multi-layered structure in the thickness direction. This folding method effectively increases the local thickness of the folded area, thereby enhancing its strength and rigidity, while providing a tighter contact surface during sealing, reducing the risk of liquid leakage.

[0152] In the above embodiment, the anti-leakage layer 2113 is provided with a connection interface in the folded area, which can prevent liquid from seeping in from the interface, thus further reducing the risk of liquid leakage.

[0153] In some embodiments, the folded region 2112 may also be called the fusion region, that is, the folded layer 2112a and the thinned layer 2112b can be bonded together by melting at high temperature with a substance having adhesive function to form a fusion region.

[0154] In some embodiments, the first thinning region 2212a is disposed opposite to the folded layer 2112a and the thinning layer 2112b, and the basis weight of the first thinning region 2212a is equal to the basis weight of the folded layer 2112a; and / or, the basis weight of the first thinning region 2212a is equal to the basis weight of the thinning layer 2112b.

[0155] In the above embodiment, the first thinning region 2212a is disposed opposite to the folded layer 2112a and the thinning layer 2112b, and their weights satisfy the above relationship. The thinning treatment of the rolled edge overlap 2210 and the wall overlap 2110 can be achieved by one thinning process, that is, the first thinning region 2212a, the thinning layer 2112b and the thinning treatment of the folded layer 2112a are formed, thereby improving manufacturing efficiency.

[0156] Please see Figure 6 and Figure 7 As shown, in some embodiments, the width of the folded region 2112 along the circumferential direction of the box body 100 is greater than or equal to the width of the first thinning region 2212a along the circumferential direction of the box body 100.

[0157] It is understandable that the edge of the first thinning region 2212a is relatively flush or concave with respect to the edge of the folded region 2112.

[0158] Please see Figure 8 and Figure 9 As shown, in some embodiments, the width of the folded region 2112 along the circumferential direction of the box body 100 is smaller than the width of the first thinning region 2212a along the circumferential direction of the box body 100.

[0159] Understandably, the edge of the first thinning region 2212a protrudes relative to the edge of the folded region 2112.

[0160] exist Figure 6 and Figure 8 In the figure, the folded layer 2112a and the thinned layer 2112b are folded according to the dotted lines.

[0161] In some embodiments, the wall overlap 2110 further includes a non-folded region 2114 located between the folded region and the non-overlapping wall portion 2120 along the circumferential direction of the box body 100. The thickness of the folded region 2112 is less than or equal to the thickness of the non-folded region 2114.

[0162] In the above embodiment, by controlling the thickness of the folded area 2112 to be less than or equal to the thickness of the non-folded area 2114, the height difference between the wall overlap 2110 and the non-overlapping wall 2120 can be reduced, thereby effectively reducing the possibility of liquid leakage from the wall 2100.

[0163] During the manufacturing process of the paper container 10, the folded area 2112 is the part that is bent and stacked when forming the wall overlap 2110, while the non-folded area 2114 is the relatively flat, unfolded part of the wall 2100. Specifically, during the forming process of the paper container 10, the folded area 2112 can be locally compacted. For example, by setting pressure rollers or molds with specific shapes and pressures, mechanical pressure is applied to the folded area after the paper material has completed the folding station, making its fiber structure more compact, thereby reducing the thickness of that area.

[0164] In some implementations, the weight of the folded region 2112 is less than the weight of the non-folded region 2114.

[0165] In some embodiments, the basis weight of the folded layer 2112a is less than the basis weight of the non-folded region 2114; and / or, the basis weight of the thinned layer 2112b is less than the basis weight of the non-folded region 2114.

[0166] In this application, the formation of the waterproof layer 2113 may include, but is not limited to: one method is to precisely apply a food-grade waterproof layer 2113 to the paper surface of the paper container 10 using a spraying or roller coating process, such as using polyethylene (PE), polylactic acid (PLA), or a biodegradable coating, achieving precise coverage by controlling the trajectory of the nozzle or roller. Another method is to pre-coat or print the paper before the paper container 10 is formed. Yet another method is to pre-install the waterproof material during the paper production stage using printing or coating techniques.

[0167] [Methods for manufacturing paper containers] Secondly, embodiments of this application provide a method for manufacturing a paper container, the method comprising: Provide side wallpaper blanks, which include a wall area and a rolled edge area; The curled edge area is thinned to form the first thinning area, resulting in the wallpaper blank to be overlapped. The opposite edges of the wallpaper blank to be overlapped are overlapped to form a tube; The bottom wallpaper blank is glued to one end of the tube to form an open receiving space; The other end of the cylinder is rolled to obtain a paper container, wherein the paper container includes a box body, the box body includes a bottom wall and a side wall, the side wall and the bottom wall together enclose an open receiving space; wherein the side wall includes a wall body and a rolled edge, the wall body has a non-overlapping part and an overlapping part, the overlapping part of the wall body is located between the beginning and end of the non-overlapping part of the wall body along the circumferential direction of the box body; the rolled edge is located at the edge of the wall body away from the bottom wall, the rolled edge includes a non-overlapping part and an overlapping part, the overlapping part of the rolled edge is located between the beginning and end of the non-overlapping part of the rolled edge along the circumferential direction of the box body, the overlapping part of the rolled edge has a first non-thinning region and a first thinning region, the first non-thinning region is located between the first thinning region and the non-overlapping part of the rolled edge along the circumferential direction of the box body.

[0168] In some implementations, the thinning process is called a shaving process.

[0169] In the above embodiments, the thinning process can help reduce the height difference of the rolled edge overlap and maintain this height difference during use, thereby helping to extend the liquid leakage time of the rolled edge.

[0170] In some embodiments, the method further includes: thinning the overlapping portion of the wall region so that the second thinned region formed in the wall region is positioned opposite to the first thinned region.

[0171] In some embodiments, the method further includes: trimming the rolled edge area so that the width of the first thinned area is smaller than the width of the second thinned area.

[0172] In the above embodiments, the above-described cutting process is beneficial for hemming and improving the structural strength of the hemmed overlap.

[0173] In some implementations, the overlap pressure in the rolled edge area is greater than the overlap pressure in the wall area.

[0174] [Sealed container] Secondly, please refer to Figure 10The present application provides a sealed container 1, including the paper container 10 and a cover 20, the cover 20 being used to press against the opening to seal the paper container 10.

[0175] In the above embodiments, since the sealed container 1 includes the paper container 10 in the above embodiments, the sealed container 1 has good sealing reliability.

[0176] In some embodiments, the cover 20 has a protrusion 21 for interference fit with the inner wall surface of the paper container 10.

[0177] The cap 20 acts like a bottle stopper, allowing it to be press-fitted against the inner wall of the opening. This creates a tight seal between the cap 20 and the inner wall of the opening, effectively blocking any liquid leakage path.

[0178] In the above embodiments, the contact method between the cover 20 and the inner wall surface at the opening can be line and surface, surface and surface, etc., so that at least one sealing interface can be formed between the cover 20 and the inner wall surface.

[0179] In this paper, interference fit means that when the cover 20 is installed, the size of the protrusion 21 is slightly larger than the size of the corresponding part of the paper container 10. Taking a surface-to-surface contact fit as an example, the maximum distance in the radial direction of the contact surface 211 of the protrusion 21 should be greater than the maximum distance in the radial direction of the inner wall surface at the opening and less than or equal to 0.3 mm.

[0180] In this application, the sealed container 1 can be used as an ultra-leak-proof paper bowl for food packaging and other applications.

[0181] In some embodiments, the cover 20 has an annular groove that mates with the rolled edge 2200.

[0182] In this document, the cover 20 is a component used to close the opening of the accommodating space of the paper container 10. Its material can be plastic, metal, silicone, or composite materials, to suit different usage requirements and cost considerations. The annular groove is a recessed structure on the cover 20, the shape of which typically matches the rolled edge 2200 of the paper container 10. It is used to accommodate and fix the rolled edge 2200 when the cover 20 is placed over the rolled edge surface. The annular groove can be integrally formed on the cover 20, for example, directly through injection molding or compression molding, or it can be manufactured separately and then fixed to the cover by bonding, snap-fitting, or other methods. The matching of the annular groove on the cover 20 with the rolled edge 2200 of the paper container 10 means that parameters such as the inner diameter, depth, wall thickness, and cross-sectional shape of the annular groove are designed to match the outer diameter, height, thickness, and cross-sectional shape of the rolled edge 2200 to ensure a tight fit and an effective sealing structure. For example, the inner wall of the annular groove can be designed to be an arc shape that matches the curvature of the outer surface of the rolled edge 2200, or it can be designed to have a certain taper to facilitate the insertion and fixation of the rolled edge 2200, thereby forming a tight physical contact between the cover 20 and the rolled edge 2200.

[0183] In the above embodiment, an annular groove is provided on the cover 20 to mate with the rolled edge 2200, so that when the cover 20 is placed on the surface of the rolled edge 2200 of the paper container 10, the rolled edge 2200 can be tightly covered and fixed by the annular groove. This structural design significantly increases the contact area and tightness between the cover 20 and the rolled edge 2200, effectively eliminating gaps that may lead to liquid leakage. The covering effect of the annular groove on the rolled edge 2200 not only provides radial restraint but also axial positioning, making the connection between the cover 20 and the paper container 10 more stable. Therefore, this technical solution can significantly improve the sealing performance of the sealed container 1 and effectively prevent liquid from leaking from the opening of the containing space 3000.

[0184] In some embodiments, the inner wall of the annular groove has an arcuate structure, and the curvature of the arcuate structure matches the curvature of the rolled edge.

[0185] In this paper, the inner wall of the annular groove has an arc-shaped structure, meaning that the inner surface of the annular groove that contacts the rolled edge 2200 exhibits a curved geometric shape. This arc-shaped structure can be circular, elliptical, or parabolic, etc., thus providing a contact surface that conforms to the shape of the rolled edge 2200. By adopting an arc-shaped structure, a tighter fit can be ensured between the annular groove and the rolled edge 2200 when the cover 20 is placed on the surface of the rolled edge 2200, reducing the local stress concentration or gaps that may occur during planar contact.

[0186] Matching the curvature of the arc-shaped structure with that of the rolled edge 2200 means that the degree of curvature and geometric profile of the inner wall of the annular groove are highly consistent with or within acceptable tolerances of the degree of curvature and geometric profile of the rolled edge 2200. This matching can be achieved through precise design and manufacturing processes. For example, if the rolled edge has a specific radius of curvature, the arc-shaped structure of the inner wall of the annular groove will be designed to have the same or a very close radius of curvature. Furthermore, matching can also refer to the complementarity of their shapes, enabling maximum contact area and uniform pressure distribution during sealing.

[0187] In the above embodiment, the inner wall of the annular groove adopts an arc-shaped structure, and its curvature matches the curvature of the rolled edge 2200, thereby establishing a highly consistent sealing interface between the cover 20 and the rolled edge 2200 of the paper container 10. This curvature matching ensures that the annular groove can fully and uniformly cover the rolled edge 2200, eliminating minor gaps or areas of uneven stress that may occur due to shape mismatch. Therefore, during the sealing process, liquid leakage from the rolled edge can be effectively prevented, significantly improving the reliability and durability of the seal.

[0188] In some implementations, the arc of the arc structure is greater than or equal to 180°.

[0189] In the above embodiment, the curvature design allows the cover to fit more tightly and comprehensively against the rolled edge 2200 of the paper container 10 when it is placed on the surface, forming a stronger clamping force. This effectively reduces gaps that may occur due to insufficient curvature, thereby significantly reducing the possibility of liquid leakage and improving the overall sealing performance and reliability of the sealed container 1.

[0190] In this application, the arc-shaped structure can be formed by molding or injection molding, designing the inner wall of the annular groove of the lid to have an arc greater than or equal to 180°, such as 190°, 200°, or 210°, to ensure a tighter wrapping of the rolled edge of the paper container. Alternatively, based on the pre-set arc-shaped structure of the inner wall of the annular groove of the lid, the arc can be further increased to more than 180° through post-processing processes such as hot pressing or mechanical deformation, thereby forming a stronger clamping force when mating with the rolled edge. This design aims to ensure a tighter and more comprehensive contact and wrapping between the lid and the rolled edge of the paper container, thereby effectively reducing the occurrence of liquid leakage.

[0191] In some implementations, the arc of the arc structure is greater than or equal to 180° and less than or equal to 360°.

[0192] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0193] Example 1 This embodiment provides a method for manufacturing a paper container, the method comprising: A side wallpaper blank is provided, the side wallpaper blank including a wall area and a rolled edge area; The wall area and the rolled edge area are thinned to form a first thinned area in the rolled edge area and a folding area containing a second thinned area in the wall area, thus obtaining a wallpaper blank for the side to be overlapped. The first thinning region is trimmed so that the width of the first thinning region is smaller than the width of the second thinning region; The second thinned area in the folded region is folded to form a folded area in the wall region; The opposite edges of the wallpaper blank to be overlapped are overlapped to form a tube; The bottom wallpaper blank is glued to one end of the tube to form an open receiving space; The other end of the cylinder is rolled to obtain a paper container, wherein the paper container includes a box body, the box body includes a bottom wall and a side wall, the side wall and the bottom wall together form an open receiving space; wherein the side wall includes a wall body and a rolled edge, the wall body has a non-overlapping part and an overlapping part, the overlapping part of the wall body is located between the beginning and end of the non-overlapping part of the wall body along the circumferential direction of the box body; the rolled edge is located at the edge of the wall body away from the bottom wall, the rolled edge includes a rolled edge non-overlapping part and a rolled edge overlapping part, the rolled edge overlapping part is located between the beginning and end of the rolled edge non-overlapping part along the circumferential direction of the box body, the rolled edge overlapping part includes a first layer of paper and a second layer of paper that overlap and connect, wherein the first layer of paper is close to the winding axis of the rolled edge, the second layer of paper has a first non-thinning region and a first thinning region, the first non-thinning region is located between the first thinning region and the rolled edge non-overlapping part along the circumferential direction of the box body.

[0194] Among them, the width w2 of the wall overlap part along the circumferential direction of the box body is 7mm, the width w1 of the rolled edge overlap part along the circumferential direction of the box body (w11 is equal to the sum of the widths of the second thinned area and the second non-thinned area) is 7mm, the width w11 of the first thinned area is 3.5mm, then the width w12 of the first non-thinned area is 3.5, and w11 / w1 is 0.5; in the side wallpaper blank, the thickness d1 of the first thinned area in the rolled edge area is 0.2mm, the thickness d of the first non-thinned area is 0.45mm, and d1 / d is 0.44, then in the paper container, the basis weight ratio of the first thinned area and the first non-thinned area is 0.44; The paper weight in the first non-thinning zone is 320 g / m². 2 .

[0195] This embodiment also provides a sealed container, which includes the above-mentioned paper container and a lid. The lid has an annular groove, and the inner wall of the annular groove has an arc-shaped structure that cooperates with the rolled edge. The arc of the arc-shaped structure is 210°.

[0196] Example 2 The difference between Example 2 and Example 1 is that the first thinning area is located in the first layer of paper.

[0197] Example 3 The difference between Example 3 and Example 1 is that w11 / w1 is 0.56.

[0198] Example 4 The difference between Example 4 and Example 1 is that w11 / w1 is 0.71.

[0199] Example 5 The difference between Example 5 and Example 1 is that w1 is 5mm and w11 is 1.5mm, so w11 / w1 is 0.3.

[0200] Example 6 The difference between Example 6 and Example 1 is that w1 is 5.5mm and w11 is 2mm, so w11 / w1 is 0.36.

[0201] Example 7 The difference between Example 7 and Example 1 is as follows: (1) The basis weight of the first non-thinning region is 350 g / m². 2 ; (2) The width w2 of the wall overlap is 9mm, the width w1 of the rolled edge overlap is 6.5mm, the width w12 of the first non-thinning area is 4.5mm, and the width w11 of the first thinning area is 2mm. Then w11 / w1 is 0.31. If d1 is 0.23mm and the thickness d is 0.52mm, then d1 / d is 0.44, and the weight ratio of the first thinned region to the first non-thinned region is 0.44.

[0202] Example 8 The difference between Example 8 and Example 7 is that w1 is 7mm and w11 is 2.5mm, so w11 / w1 is 0.36.

[0203] Example 9 The difference between Example 9 and Example 7 is that w1 is 9mm and w11 is 4.5mm, so w11 / w1 is 0.5.

[0204] Example 10 The difference between Example 10 and Example 1 is that d1 is 0.16 mm, d1 / d is 0.36, and the weight ratio of the first thinned region to the first non-thinned region is 0.36.

[0205] Example 11 The difference between Example 11 and Example 1 is that d1 is 0.18 mm, d1 / d is 0.4, and the weight ratio of the first thinned region to the first non-thinned region is 0.4.

[0206] Example 12 The difference between Example 12 and Example 1 is that d1 is 0.25mm, d1 / d is 0.56, and the weight ratio of the first thinned region to the first non-thinned region is 0.56.

[0207] Example 13 The difference between Example 13 and Example 1 is that d1 is 0.28 mm, d1 / d is 0.62, and the weight ratio of the first thinned region to the first non-thinned region is 0.62.

[0208] Example 14 The difference between Example 14 and Example 1 is: (1) The paper weight of the first non-thinning zone is 250 g / m². 2 ; (2) d1 is 0.13mm, d is 0.36mm, d1 / d is 0.36, and the weight ratio of the first thinned region to the first non-thinned region is 0.36.

[0209] Example 15 The difference between Example 15 and Example 14 is that d1 is 0.15mm, d1 / d is 0.42, and the weight ratio of the first thinned region to the first non-thinned region is 0.42.

[0210] Example 16 The difference between Example 16 and Example 14 is that d1 is 0.18 mm, d1 / d is 0.5, and the weight ratio of the first thinned region to the first non-thinned region is 0.5.

[0211] Test section The paper containers and sealed containers prepared in Examples 1 to 16 above were subjected to performance tests. The performance test results are shown in Tables 1 to 3. The specific test methods are as follows: 1. Testing of paper containers (1) Curling rate Based on the characteristic parameters of the paper containers in the above embodiments, 100 samples were prepared for each embodiment. Defects in the rolled edges of these samples were observed, and the number of samples with bursting, breakage, and cracked overlaps (denoted as n) was counted. Finally, the forming rate was calculated using the formula: forming rate = (100-n)%.

[0212] 2. Testing of sealed containers (1) Leakage time Hot water at 100°C was poured into the paper containers of the above embodiments and comparative examples. After sealing the containers, they were tilted to ensure that the hot water fully contacted the wall overlaps and rolled edge overlaps. Observation and recording were made to determine whether liquid leakage occurred in this area and the time when leakage began.

[0213] Analysis of test results for each embodiment and comparative example Paper containers and sealed containers for each embodiment were prepared according to the above method, and various performance parameters were measured. The results are shown in Tables 1 to 3 below.

[0214] Table 1: Test results of Examples 1-2

[0215] According to Table 1, a comparison of the test results of Example 1 and Example 2 shows that the second layer of paper in the edge-rolling overlap has a second thinning area, which can prolong the time for liquid to leak from the edge-rolling overlap.

[0216] Table 2: Test results in Examples 1 and 3-9

[0217] According to Table 2, comparing the test results of Examples 1 and 3-6, it can be seen that the basis weight of the first non-thinned region is 320 g / m². 2 The ratio w11 / w1 between the width w11 of the first thinning region and the width w1 of the rolled edge overlap is in the range of 0.3 to 0.75. As w11 / w1 increases to 0.57, the leakage time remains at 20 minutes and the rolled edge forming rate remains at 100%. When w11 / w1 exceeds 0.57, the leakage time remains basically unchanged, but the forming rate shows a downward trend.

[0218] Comparing the test results of Examples 7-9, it can be seen that the basis weight of the first non-thinned region is 350 g / m². 2 The ratio w11 / w1 between the width w11 of the first thinning area and the width w1 of the rolled edge overlap is in the range of 0.3 to 0.5. As w11 / w1 increases, the leakage time remains at 20 minutes and the rolled edge forming rate remains at 100%.

[0219] Table 3: Test results of Examples 1 and 10-16

[0220] According to Table 3, comparing the test results of Examples 1 and 10-13, it can be seen that the basis weight of the first non-thinned region is 320 g / m². 2 At that time, the ratio of the basis weight of the first thinned region to the basis weight of the first non-thinned region is in the range of 0.35 to 0.65. As the basis weight ratio increases, the leakage time gradually shortens, while the forming rate of the rolled edge gradually increases.

[0221] Comparing the test results of Examples 14-16, it can be seen that when the basis weight of the first non-thinned region is 250 g / m², 2 As the ratio of the weight of the first thinned region to the weight of the first non-thinned region gradually increases, the leakage time gradually shortens, while the forming rate of the rolled edge gradually increases.

[0222] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A paper container, characterized in that, Includes a housing, the housing comprising: bottom wall; The sidewalls, together with the bottom wall, form an open accommodating space; The sidewall includes a wall body and a rolled edge. The wall body has a non-overlapping portion and an overlapping portion. The overlapping portion is located between the beginning and end of the non-overlapping portion along the circumferential direction of the box body. The rolled edge is located at the edge of the wall body away from the bottom wall. The rolled edge includes a non-overlapping portion and an overlapping portion. The overlapping portion is located between the beginning and end of the non-overlapping portion along the circumferential direction of the box body. The overlapping portion has a first non-thinning region and a first thinning region. The first non-thinning region is located between the first thinning region and the non-overlapping portion along the circumferential direction of the box body.

2. The paper container according to claim 1, characterized in that, The weight ratio of the first thinned region to the first non-thinned region is less than 0.9:1, can be less than 0.7:1, or can be (0.35~0.65):

1.

3. The paper container according to claim 2, characterized in that, The weight ratio of the first thinned region to the first non-thinned region is (0.36~0.56):

1.

4. The paper container according to claim 1, characterized in that, The width w11 of the first thinning region along the circumferential direction of the box body and the width w1 of the rolled edge overlap along the circumferential direction of the box body satisfy: 0.3≤w11 / w1≤0.

75.

5. The paper container according to claim 4, characterized in that, 0.3≤w11 / w1≤0.

6.

6. The paper container according to any one of claims 1 to 5, characterized in that, The basis weight of the first thinned region is 90 g / m². 2 ~164g / m 2 .

7. The paper container according to any one of claims 1 to 6, characterized in that, The basis weight of the first non-thinned region is 250 g / m². 2 ~350g / m 2 .

8. The paper container according to claim 7, characterized in that, The basis weight of the first non-thinned region is 320 g / m². 2 ~350g / m 2 Furthermore, the width w11 of the first thinning region along the circumferential direction of the box body and the width w1 of the rolled edge overlap along the circumferential direction of the box body satisfy: 0.3≤w11 / w1≤0.

56.

9. The paper container according to claim 8, characterized in that, The weight ratio of the first thinned region to the first non-thinned region is (0.4~0.56):

1.

10. The paper container according to claim 9, characterized in that, The basis weight of the first thinned region is 128 g / m². 2 ~164g / m 2 .

11. The paper container according to claim 7, characterized in that, The basis weight of the first non-thinned region is greater than or equal to 250 g / m². 2 And less than 320g / m 2 The weight ratio of the first thinned region to the first non-thinned region is (0.36~0.5):

1.

12. The paper container according to claim 11, characterized in that, The thickness of the first thinning region is 90 g / m 2 ~125g / m 2 .

13. The paper container according to claim 1, characterized in that, The rolled edge overlap includes a first layer of paper and a second layer of paper that are overlapped and connected, wherein the first layer of paper is close to the winding axis of the rolled edge, and the first thinned area and the first non-thinned area are located on the second layer of paper.

14. The paper container according to claim 13, characterized in that, The first thinning area is recessed inward along the axial direction of the box body, facing the surface of the second layer of paper.

15. The paper container according to any one of claims 1 to 14, characterized in that, The compaction density of the rolled edge overlap is greater than that of the rolled edge non-overlap.

16. The paper container according to claim 15, characterized in that, The compaction density of the first thinned region is greater than that of the first non-thinned region.

17. The paper container according to claim 15 or 16, characterized in that, The first layer of paper has a thinned area and a non-thinned area, the thinned area being connected between the non-thinned area and the non-overlapping edge portion, wherein the thinned area is disposed opposite to the first thinning area.

18. The paper container according to claim 17, characterized in that, The compaction density of the thinned area is greater than that of the non-thinned area.

19. The paper container according to claim 18, characterized in that, The first layer of paper also has a transition region that connects the non-thinned region and the thinned region, and the compaction density of the transition region is greater than the compaction density of the non-thinned region and less than the compaction density of the thinned region.

20. The paper container according to any one of claims 1 to 19, characterized in that, The curvature of the rolled edge is 180°~540°.

21. The paper container according to any one of claims 1 to 20, characterized in that, The wall overlap includes a wall overlap bottom layer, a folded area, and a leak-proof layer, wherein the leak-proof layer is located between the wall overlap bottom layer and the folded area.

22. The paper container according to claim 21, characterized in that, The folded area includes a folded layer and a thinning layer, wherein the folded layer is located between the wall overlap bottom layer and the thinning layer, wherein the folded layer is overlapped and connected to the wall overlap bottom layer, the thinning layer is folded and disposed with the folded layer, and the leak-proof layer is located between the wall overlap bottom layer and the folded layer, and extends from the wall overlap bottom layer and the folded layer to the surface of the thinning layer away from the folded layer.

23. The paper container according to claim 22, characterized in that, The first thinning region is disposed opposite to the folded layer and the thinning layer, and the weight of the first thinning region is equal to the weight of the folded layer; And / or, the basis weight of the first thinned region is equal to the basis weight of the thinned layer.

24. The paper container according to claim 22 or 23, characterized in that, The width of the folded area along the circumferential direction of the box is greater than or equal to the width of the first thinned area along the circumferential direction of the box. Alternatively, the width of the folded area along the circumferential direction of the box body is less than the width of the first thinning area along the circumferential direction of the box body.

25. The paper container according to any one of claims 22 to 24, characterized in that, The wall overlap portion also includes a non-folded area. Along the circumferential direction of the box, the non-folded area is located between the folded area and the non-overlapping portion of the wall, and the thickness of the folded area is less than or equal to the thickness of the non-folded area.

26. The paper container according to claim 25, characterized in that, The weight of the folded region is less than the weight of the unfolded region.

27. The paper container according to claim 26, characterized in that, The weight of the folded layer is less than the weight of the non-folded region; And / or, the basis weight of the thinned layer is less than the basis weight of the unfolded region.

28. A method for manufacturing a paper container, characterized in that, include: A side wallpaper blank is provided, the side wallpaper blank comprising a wall area and a rolled edge area; The rolled edge area is thinned to form a first thinned area, resulting in a wallpaper blank for the overlapping side; The opposite two sides of the wallpaper blank to be overlapped are overlapped to form a tube; The bottom wallpaper blank is glued to one end of the cylinder to form an open receiving space; The other end of the cylinder is rolled to obtain a paper container, wherein the paper container includes a box body, the box body includes a bottom wall and a side wall, the side wall and the bottom wall together form an open receiving space; wherein the side wall includes a wall body and a rolled edge, the wall body has a non-overlapping portion and an overlapping portion, the overlapping portion of the wall body is located between the beginning and end of the non-overlapping portion of the wall body along the circumferential direction of the box body; the rolled edge is located at the edge of the wall body away from the bottom wall, the rolled edge includes a non-overlapping portion and an overlapping portion, the overlapping portion of the rolled edge is located between the beginning and end of the non-overlapping portion of the rolled edge along the circumferential direction of the box body, the overlapping portion of the rolled edge has a first non-thinning region and a first thinning region, the first non-thinning region is located between the first thinning region and the non-overlapping portion of the rolled edge along the circumferential direction of the box body.

29. The manufacturing method according to claim 28, characterized in that, The thinning process is a shaving process.

30. The manufacturing method according to claim 29, characterized in that, Also includes: The overlapping portion of the wall region is thinned so that the second thinned region formed in the wall region is positioned opposite to the first thinned region.

31. The manufacturing method according to claim 30, characterized in that, Also includes: The rolled edge area is trimmed so that the width of the first thinned area is smaller than the width of the second thinned area.

32. The manufacturing method according to any one of claims 28 to 31, characterized in that, The overlap pressure of the rolled edge area is greater than the overlap pressure of the wall area.

33. A sealed container, characterized in that, include: The paper container according to any one of claims 1 to 27 or the paper container prepared by the manufacturing method according to any one of claims 28 to 32, and A lid for interference fit with the opening to seal the paper container.

34. The sealed container according to claim 33, characterized in that, The cover has a protrusion that is used for an interference fit with the inner wall of the paper container.

35. The sealed container according to claim 33 or 34, characterized in that, The cover has an annular groove that mates with the rolled edge.

36. The sealed container according to claim 35, characterized in that, The inner wall of the annular groove has an arc-shaped structure, and the curvature of the arc-shaped structure matches the curvature of the rolled edge.

37. The sealed container according to claim 36, characterized in that, The arc of the arc structure is greater than or equal to 180°.

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