Paper-based containers, laminated paper-based containers, and sealed containers

Abstract

This application provides a paper-based container, a laminated paper-based container, and a sealed container. The paper-based container includes a box body with a bottom wall, side walls, and a flange. The side walls and bottom wall together form an open receiving space. The flange is connected to the edge of the side wall away from the bottom wall. The flange has a first pressing portion, which includes multiple layers of paper sheets pressed together. At least one layer of paper sheet has a clearance structure in the first pressing portion, which provides clearance space for accommodating at least a portion of the paper sheet that deforms and overflows from the flange during the pressing process. The paper-based container provided by this application can extend the service life of the laminated cutting tool and has good sealing performance.

Description

Technical Field

[0001] This application relates to the field of paper-based container technology, and more specifically, to a paper-based container, a coated paper-based container, and a sealed container. Background Technology

[0002] Due to their good environmental sustainability, paper-based containers are gradually becoming one of the mainstream solutions to replace plastic containers in the packaging industry. However, during the manufacturing process of paper-based containers, cutting and laminating blades are prone to problems such as edge wear and cracking, which shortens the life of the blades. In some cases, the cutting and laminating blades may even reduce the lamination effect of the paper-based container during the cutting process, resulting in its airtightness failing to meet standards. Utility Model Content

[0003] This application provides a paper-based container, a coated paper-based container, and a sealed container, which can extend the service life of the coated cutting blade and has good sealing performance.

[0004] This application is achieved through the following technical solution: In a first aspect, embodiments of this application provide a paper-based container, including a box body, which includes a bottom wall, side walls, and a flange. The side walls and the bottom wall together form an open receiving space. The flange is connected to the edge of the side wall away from the bottom wall. The flange has a first pressing portion, which includes multiple layers of paper sheets pressed together. At least one layer of paper sheets has a clearance structure in the first pressing portion. The clearance structure has a clearance space for accommodating at least a portion of the paper material that overflows from the flange due to deformation of the paper sheets during the pressing process.

[0005] In the paper-based container provided in this application embodiment, the first pressing portion includes multiple layers of paper sheets pressed together, and at least one layer of paper sheet has a clearance structure in the first pressing portion. The clearance structure has clearance space for accommodating the deformation of the paper sheet during the pressing process. The clearance space in the clearance structure can accommodate at least part of the paper sheet that deforms and protrudes outward during the pressing process. This reduces the number of times the cutting and laminating blade contacts the paper, thereby extending the service life of the cutting and laminating blade. Moreover, the reduction in the number of times the cutting and laminating blade contacts the paper can also reduce the occurrence of micro-peeling at the interface between the lamination and the paper base caused by cutting the paper, thereby improving the sealing performance. Therefore, the paper-based container provided in this application embodiment can extend the service life of the cutting and laminating blade and has good sealing performance.

[0006] In some embodiments of this application, the first pressing portion includes a first paper layer and a second paper layer, wherein the first paper layer has the avoidance structure in the first pressing portion.

[0007] In some embodiments of this application, the second layer of paper has the avoidance structure at the first pressing portion.

[0008] In some embodiments of this application, the first pressing part is a rolled edge structure, each layer of paper has a starting end and a closing end along the winding direction, the starting end is located in the inner circle of the first pressing part, and the starting end of at least one layer of paper has the avoidance structure in the first pressing part, and the closing end is located in the outer circle of the first pressing part.

[0009] In some embodiments of this application, the number of winding turns of the rolled edge structure is 2 to 5.

[0010] In some embodiments of this application, the starting end of each layer of paper has the avoidance structure at the first pressing portion.

[0011] In some embodiments of this application, the first pressing part further has a stepped structure, the height of which is in the range of 0mm to 1mm.

[0012] In some embodiments of this application, the flange has a second pressing portion, the first pressing portion and the second pressing portion are connected, and the density of the first pressing portion is greater than the density of the second pressing portion.

[0013] In some embodiments of this application, the thickness of the first pressing portion is greater than 0 and less than or equal to 4 mm.

[0014] In some embodiments of this application, the sidewall has a third pressing portion, which is connected to the first pressing portion.

[0015] In some embodiments of this application, the avoidance structure includes at least one of avoidance notch, chamfer, and hole.

[0016] In some embodiments of this application, the paper has a first side and a second side forming the clearance notch, the first side and the second side are connected to form the clearance space, and the angle θ formed between the first side and the second side is 90°≤θ<180°.

[0017] In some embodiments of this application, the angle θ formed between the first side and the second side is 90°≤θ<150°.

[0018] In some embodiments of this application, the width W of the first pressing portion along the radial direction satisfies: 2mm ≤ W ≤ 10mm, and the depth d of the clearance notch along the bottom wall to the flange direction satisfies: 0 <d≤W。

[0019] In some embodiments of this application, the width w1 of the third pressing part satisfies: 4mm≤w1≤20mm, and the width w2 of the clearance notch along the circumferential direction of the box body satisfies: w1≤w2≤w1+20mm.

[0020] Secondly, embodiments of this application provide a coated paper-based container, including the paper-based container in any embodiment of the first aspect of this application and a membrane, the membrane covering the inner wall of the accommodating space and the surface of the flange.

[0021] In some embodiments of this application, the thickness of the membrane is in the range of 0.03 mm to 0.2 mm.

[0022] Thirdly, embodiments of this application provide a sealed container, including the film-coated paper-based container in any embodiment of the second aspect of this application and a lid, the lid being disposed on the flanged surface to seal the opening of the containment space.

[0023] In some embodiments of this application, the thickness of the cover is in the range of 0.01 mm to 0.08 mm.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of a paper-based container provided in some embodiments of this application.

[0027] Figure 2 This is a schematic diagram of the structure of the sidewall of a paper-based container in an unfolded state, provided for some embodiments of this application.

[0028] Figure 3 for Figure 2 A magnified view of a section at point C.

[0029] Figure 4 This is a partial structural diagram of the sidewall of a paper-based container in an unfolded state, provided for some embodiments of this application.

[0030] Figure 5 This is a partial structural diagram of the sidewall of a paper-based container in an unfolded state, provided for some embodiments of this application.

[0031] Figure 6This is a cross-sectional structural diagram of a coated paper-based container provided in some embodiments of this application.

[0032] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0033] Figure 8 This is a cross-sectional structural diagram of a sealed container provided in some embodiments of this application.

[0034] Figure 9 for Figure 8 A magnified view of a section at point B.

[0035] icon: 1-Sealed container; 10-Laminated paper-based containers; 100 - Paper-based container; 1000 - Box body; 1100 - Capacity space; 1200-bottom wall; 1300 - Sidewall, 1310 - Third pressing part; 1400-Flanged edge, 1410-First pressing part, 1411-Paper piece, 1411a-Starting end, 1411b-Ending end, 1412-Avoidance structure, 1412a-First side, 1412b-Second side, 1420-Second pressing part; 200-membrane; 20-Cap. Detailed Implementation

[0036] 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.

[0037] 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 the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0038] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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).

[0043] The edges of paper-based containers can be mechanically rolled to form a ring-shaped reinforced flange. This flange significantly improves the rigidity of the opening, enabling it to withstand external compression or internal pressure and preventing deformation or collapse. However, during the rolling process, some paper material may overflow from the flange perimeter due to plastic deformation, forming irregular excess paper. In the subsequent lamination process, the uncoated film layer and the overflowing paper material need to be removed simultaneously using a cutting tool. During this process, the paper fibers continuously rub against the cutting edge, which can easily cause rapid dulling of the cutting edge, and may also lead to wear, chipping, and other problems, resulting in a shortened tool life and even reducing the lamination effect of the paper-based container, causing it to fail to meet airtightness standards.

[0044] In view of this, embodiments of this application provide a paper-based container, a coated paper-based container, and a sealed container, which can extend the service life of the coated cutting blade and have good sealing performance.

[0045] Firstly, please refer to Figure 1 and Figure 2As shown, this application provides a paper-based container 100, including a box body 1000. The box body 1000 includes a bottom wall 1200, a side wall 1300, and a flange 1400. The side wall 1300 and the bottom wall 1200 together form an open receiving space 1100. The flange 1400 is connected to the edge of the side wall 1300 away from the bottom wall 1200. The flange 1400 has a first pressing portion 1410. The first pressing portion 1410 includes multiple layers of paper sheets 1411 pressed together. At least one layer of paper sheet 1411 has a clearance structure in the first pressing portion 1410. The clearance structure has clearance space for accommodating at least a portion of the paper material that overflows from the flange 1400 due to deformation of the paper sheet 1411 during the pressing process.

[0046] Paper-based container 100 is a packaging container made primarily from pulp or recycled paper through processes such as molding and coating. It can be used in food and beverage, industrial and logistics, and medical and health fields. In some embodiments, paper-based container 100 can serve as a hot beverage packaging container, a cold beverage packaging container, or a ready-to-eat packaging container in catering services, such as heat-resistant paper cups (heat resistant to 120℃), anti-condensation paper cups, leak-proof paper bowls, and divider-type lunch boxes. In some embodiments, paper-based container 100 can also serve as a food storage and transportation container, such as an oil-proof paper box, a modified atmosphere packaging paper box (for fresh fruits and vegetables), and a self-heating paper bowl.

[0047] The box body 1000 is mainly formed by the bottom wall 1200 and the side walls 1300, creating a cup-shaped, bowl-shaped, or cylindrical structure with an open receiving space 1100. The receiving space 1100 is used to store items, such as fresh food. In some embodiments, the side walls 1300 of the box body 1000 can be formed by overlapping the opposite edges of paper-based material and then joining them together with glue, ultrasonic waves, or by pressing them together to create a cylindrical structure with open ends. The bottom wall 1200 and the side walls 1300 of the box body 1000 enclose one of the open ends to form the receiving space 1100.

[0048] In the paper-based container 100 provided in this embodiment, the first pressing portion 1410 includes multiple layers of paper sheets 1411 pressed together, and at least one layer of paper sheet 1411 has a clearance structure in the first pressing portion 1410. The clearance structure has clearance space for accommodating the deformation of the paper sheet 1411 during the pressing process. The clearance space in the clearance structure can accommodate at least part of the paper sheet 1411 deformed and protruding outward during the pressing process, which can reduce the number of times the cutting and laminating blade contacts the paper, thereby helping to extend the service life of the cutting and laminating blade. Moreover, the reduction in the number of times the cutting and laminating blade contacts the paper can also reduce the occurrence of micro-peeling at the interface between the lamination and the paper base caused by cutting the paper, thereby helping to improve the sealing performance. Therefore, the paper-based container 100 provided in this embodiment can extend the service life of the cutting and laminating blade and has good sealing performance.

[0049] In the above embodiments, the bottom wall 1200 and side walls 1300 of the box body 1000 can be made of the same paper base material or different paper base materials. In some embodiments, the bottom wall 1200 and side walls 1300 are made of the same paper base material, such as compressible cardboard. Cardboard is a relatively thick and heavy paper, characterized by its greater thickness, stiffer feel, and better texture, which can improve the structural strength of the box body 1000. The material of cardboard is usually wood pulp paper or cotton pulp paper, and some cardboard is made of fiber materials, such as bamboo fiber, straw paper, etc.

[0050] Please continue reading. Figure 1 and Figure 2 As shown, in some embodiments, the first pressing portion 1410 includes a first layer of paper and a second layer of paper, wherein the first layer of paper has an avoidance structure in the first pressing portion 1410.

[0051] In other embodiments, the second paper layer may also have a clearance structure in the first pressing portion 1410.

[0052] In some other embodiments, both the first and second paper layers have a clearance structure in the first pressing section 1410.

[0053] In the above embodiments, it is understood that the flange 1400 can be formed by folding and flattening a piece of paper 1411. The flange 1400 is arranged in the radial direction of the box body 1000, which refers to the direction perpendicular to the longitudinal axis, and the first pressing part 1410 can be formed by pressing the two ends of the paper together. The flange 1400 can also be formed by folding and flattening the edge of the paper on the side wall 1300 away from the bottom wall 1200.

[0054] In the embodiments of this application, the paper can be folded, rolled, and flattened to form a flange 1400, so as to further enhance the structural strength of the flange 1400.

[0055] In some embodiments, the first pressing portion 1410 has a rolled edge structure, and each layer of paper 1411 has a corresponding starting end 1411a and a ending end 1411b along the winding direction (e.g., ...). Figure 2 As shown, the starting end 1411a is located in the inner ring of the first pressing part 1410, and the starting end 1411a of at least one layer of paper 1411 has a clearance structure in the first pressing part 1410, while the ending end 1411b is located in the outer ring of the first pressing part 1410.

[0056] In the above embodiments, the rolled edge structure helps to improve the structural strength of the flange 1400. Furthermore, the clearance structure located on the inner ring of the first pressing portion 1410 helps to improve the coating effect.

[0057] It should be noted that the first pressing part 1410 is formed by crimping the outer edge of the flanging 1400. Specifically, it can be crimped again to form a straight cross-section, or can be crimped twice or more to form a hollow square-shaped cross-section. The specific structure is determined by the size of the box body 1000 in production, which can effectively further enhance the structural strength of the side wall 1300.

[0058] In some embodiments, the number of winding turns of the crimping structure is 2 to 5 turns.

[0059] In the above embodiment, setting the number of winding turns within the above range can improve the structural strength of the flanging 1400 and reduce the probability of crack occurrence.

[0060] In some embodiments, the starting end 1411a of each layer of paper sheet 1411 is provided with an avoiding structure at the first pressing part 1410.

[0061] This accommodates more overflowed paper material as much as possible, which helps to prolong the service life of the cutting and laminating cutter and improve the laminating effect.

[0062] In some embodiments, the first pressing part 1410 further has a step structure, and the height of the step structure ranges from 0 mm to 1 mm.

[0063] The step structure refers to a stepped structure formed by overlapping the two side edges of the flanging 1400. The height of the step structure refers to the height difference between the overlapping area and the non-overlapping area in the flanging 1400.

[0064] In the above embodiment, setting the height of the step structure within the above range helps to reduce wrinkles formed when the laminating film covers the flange surface and the inner wall of the accommodating space 1100, thereby increasing the fitting degree between the laminating film and the cover sealing the opening, and achieving good sealing performance.

[0065] For example, the height of the step structure can be, but is not limited to, 0mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or a value range composed of any two of the above values.

[0066] Please continue to refer to Figure 1 As shown, in some embodiments, the flanging 1400 is provided with a second pressing part 1420, the first pressing part 1410 is connected with the second pressing part 1420, and the density of the first pressing part 1410 is greater than that of the second pressing part 1420.

[0067] In the above embodiments, after the first pressing part 1410 and the second pressing part 1420 are flattened, the density of the first pressing part 1410 is greater than the density of the second pressing part 1420, which can further help reduce the height of the stepped structure and improve the coating effect to enhance air tightness.

[0068] In some embodiments, the thickness of the first pressing portion 1410 is greater than 0 and less than or equal to 4 mm.

[0069] The thickness of the first pressing part 1410 refers to the (vertical) distance between the first surface near the bottom wall 1200 and the second surface away from the bottom wall 1200.

[0070] In the above embodiments, the thickness of the first pressing part 1410 is within the above range, which enables the flange 1400 to have high structural strength.

[0071] In some examples, the thickness of each sheet of paper before molding is approximately 0.25 mm to 1 mm, and 1 to 4 sheets of paper are stacked in the first pressing section 1410. During the molding and vacuum forming processes, due to the compressibility of paper, the thickness of the first pressing section 1410 after extrusion is greater than 0 and less than or equal to 4 mm.

[0072] For example, the thickness of the first pressing part 1410 may be, but is not limited to, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or any two of the above values.

[0073] Please continue reading. Figure 1 As shown, in some embodiments, the sidewall 1300 also has a third pressing portion 1310, which is connected to the first pressing portion 1410.

[0074] In the above embodiment, the third pressing part 1310 is formed by bonding the two edges of the paper base material together with glue, pressing against each other, or using ultrasonic waves, and the third pressing part 1310 also has a seam line. The provision of this third pressing part 1310 reduces the probability of visible or invisible gaps appearing at the seam line after the paper base container 100 has been stored for a long time, thereby further improving the sealing effect. This helps to maintain the freshness of items stored in the paper base container 100 for extended periods.

[0075] In some embodiments, the avoidance structure includes at least one of the avoidance notch 1412, chamfer, and hole.

[0076] Please see Figure 2 and Figure 3As shown, in some specific embodiments, the paper 1411 has a first side 1412a and a second side 1412b forming an avoidance notch 1412, the first side 1412a and the second side 1412b are connected to form an avoidance space, and the angle θ formed between the first side 1412a and the second side 1412b is 90°≤θ<180°.

[0077] Angle θ refers to the angle formed by the intersection of the extension of the first side 1412a and the extension of the second side 1412b.

[0078] In the above embodiments, when the angle θ is within the above range, the frequency of cracks appearing in the flange 1400 during the manufacturing process can be reduced.

[0079] It is understandable that the longitudinal section of the clearance gap 1412 is L-shaped and perpendicular to the bottom wall 1200.

[0080] In some embodiments, the angle θ formed between the first side 1412a and the second side 1412b can be 90°≤θ<150°.

[0081] In other embodiments, the connection between the first side 1412a and the second side 1412b can be arc-shaped.

[0082] Please see Figure 1 and Figure 4 As shown, in some embodiments, the radial width W of the first pressing portion 1410 satisfies: 2mm ≤ W ≤ 10mm, and the depth d of the clearance notch 1412 along the direction from the bottom wall 1200 to the flange 1400 satisfies: 0 <d≤W。

[0083] In the above embodiments, the width W and depth d are respectively within the above range, which can further reduce the probability of the peripheral edge of the flange 1400 protruding and the probability of the flange 1400 bursting during the rolling process.

[0084] For example, if the width W of the first pressing part 1410 in the radial direction can be 2mm, then the depth d of the clearance notch 1412 in the direction from the bottom wall 1200 to the flange 1400 can be 0.5mm, 1mm, 1.5mm, 2mm, etc.

[0085] Please see Figure 1 and Figure 5 As shown, in some embodiments, the width w1 of the third pressing part 1310 satisfies: 4mm≤w1≤20mm, and the width w2 of the clearance notch 1412 along the circumferential direction of the box body 1000 satisfies: w1≤w2≤w1+20mm.

[0086] In the above embodiments, w1 and w2 are respectively within the above range, which can further reduce the probability of protrusion of the peripheral edge of the flange 1400.

[0087] Secondly, please refer to Figure 6 and Figure 7 As shown, this application provides a coated paper-based container 10, including the paper-based container 100 in any embodiment of the first aspect of this application and a membrane 200, which covers the inner wall of the accommodating space 1100 and the surface of the flange 1400.

[0088] In the above embodiments, the membrane 200 can be made of any material well known in the art, for example, the membrane 200 can be made of EVOH material (an abbreviation for ethylene / vinyl alcohol copolymer).

[0089] In the embodiments of this application, the thickness of the membrane 200 is within a suitable range, which can further reduce the wrinkles generated when it covers the stepped structure of the first pressing part 1410, thereby further improving the adhesion between the membrane 200 and the cover.

[0090] In some embodiments, the thickness of the membrane 200 is 0.03 mm to 0.2 mm.

[0091] The thickness of membrane 200 refers to the (vertical) distance between the first surface near the bottom wall 1200 and the second surface away from the bottom wall 1200.

[0092] In the above embodiments, the thickness of the membrane 200 is within the above range, which can help reduce the wrinkles formed at the stepped structure.

[0093] Furthermore, in some embodiments, the thickness of the membrane 200 is less than or equal to the height of the stepped structure.

[0094] In the above embodiments, the thickness of the membrane 200 and the height of the step structure satisfy the above relationship, which can further reduce the wrinkles formed at the step structure, further improve the fit between the membrane 200 and the cover, and thus the sealing effect of the paper-based container 100 will also be better.

[0095] Thirdly, please refer to Figure 8 and Figure 9 As shown, this application provides a sealed container 1, including a film-coated paper-based container 10 as described in any embodiment of the second aspect of this application and a cover 20, which covers the surface of the flange 1400 to seal the opening of the accommodating space 1100.

[0096] In some embodiments, the thickness of the cover 20 is 0.01 mm to 0.08 mm.

[0097] 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-based container, characterized in that, Includes a housing, the housing comprising: bottom wall; Side walls, which, together with the bottom wall, enclose an open receiving space; and The flange is connected to the edge of the sidewall away from the bottom wall. The flange has a first pressing portion, which includes multiple layers of paper sheets pressed together. At least one layer of the paper sheets has a clearance structure in the first pressing portion. The clearance structure has clearance space for accommodating at least a portion of the paper material that overflows from the flange due to deformation of the paper sheets during the pressing process.

2. The paper-based container according to claim 1, characterized in that, The first pressing part includes a first layer of paper and a second layer of paper, wherein the first layer of paper has the avoidance structure in the first pressing part; And / or, the second layer of paper has the avoidance structure in the first pressing portion.

3. The paper-based container according to claim 1, characterized in that, The first pressing part has a rolled edge structure. Each layer of paper has a starting end and a closing end along the winding direction. The starting end is located in the inner circle of the first pressing part, and the starting end of at least one layer of paper has the avoidance structure in the first pressing part. The closing end is located in the outer circle of the first pressing part.

4. The paper-based container according to claim 3, characterized in that, The number of winding turns in the rolled edge structure is 2 to 5.

5. The paper-based container according to claim 3, characterized in that, Each of the paper sheets has the avoidance structure at the starting end of the first pressing part.

6. The paper-based container according to claim 1, characterized in that, The first pressing part also has a stepped structure, the height of which is in the range of 0mm to 1mm.

7. The paper-based container according to claim 6, characterized in that, The flange has a second pressing portion, the first pressing portion and the second pressing portion are connected, and the density of the first pressing portion is greater than the density of the second pressing portion.

8. The paper-based container according to claim 7, characterized in that, The thickness of the first pressing part is greater than 0 and less than or equal to 4 mm.

9. The paper-based container according to claim 1, characterized in that, The sidewall has a third pressing part, which is connected to the first pressing part.

10. The paper-based container according to claim 9, characterized in that, The avoidance structure includes at least one of avoidance notch, chamfer, and hole.

11. The paper-based container according to claim 10, characterized in that, The paper has a first side and a second side forming the clearance notch, the first side and the second side are connected to form the clearance space, and the angle θ formed between the first side and the second side is 90°≤θ<180°.

12. The paper-based container according to claim 11, characterized in that, The angle θ formed between the first side and the second side is 90°≤θ<150°.

13. The paper-based container according to claim 11, characterized in that, The width W of the first pressing part along the radial direction of the box body satisfies: 2mm ≤ W ≤ 10mm, and the depth d of the clearance notch along the bottom wall to the flange direction satisfies:

0. <d≤W。 14. The paper-based container according to claim 11, characterized in that, The width w1 of the third pressing part satisfies: 4mm≤w1≤20mm, and the width w2 of the clearance notch along the circumferential direction of the box body satisfies: w1≤w2≤w1+20mm.

15. A coated paper-based container, characterized in that, include: The paper-based container according to any one of claims 1 to 14, and A membrane is used to cover the inner wall of the receiving space and the surface of the flange.

16. A sealed container, characterized in that, include: The coated paper-based container of claim 15, and A cover is placed on the surface of the flange to seal the opening of the receiving space.

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