Liner structure

Abstract

The utility model provides a liner structure, relates to the technical field of packaging, and solves the technical problem that a large amount of EPS (expandable polystyrene) liners are not environment-friendly enough. The liner structure is made of a paper material; the liner structure comprises a paper support, a foot pad, a paper ring and a supporting block; a containing cavity is formed in the paper support and used for bearing to-be-packaged equipment. The paper ring is arranged in the paper support and is used for wrapping and limiting to-be-packaged equipment; the foot pad is arranged at the bottom of an inner cavity of the paper ring and used for supporting to-be-packaged equipment. The supporting block is arranged between the paper support and the paper ring so as to reinforce the strength of the corners of the liner structure. The gasket is made of paper materials, so that the gasket is small in environmental pollution, capable of being recycled and reused, low in production cost, simple in structural assembly process and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to a liner structure for packaging a columnar water tank or a columnar air conditioner. Background Art

[0002] Currently, air-energy water heater tanks and floor-standing column air conditioners on the market primarily use EPS foam as a cushioning support material. Excessive use of EPS can lead to white pollution, and replacing EPS with environmentally friendly, biodegradable, and green packaging materials has become a trend in cushioning packaging. Paper, a green and environmentally friendly packaging material, is currently the mainstream green packaging material due to its low production cost, recyclability, and minimal environmental impact.

[0003] Based on the advantages of paper packaging materials, the utility model proposes a cylindrical water tank liner structure made of all-paper packaging materials. Utility Model Content

[0004] The purpose of the utility model is to provide a liner structure to solve the technical problem in the prior art that a large amount of EPS liners are used and are not environmentally friendly.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The utility model provides a padding structure made of paper material; the padding structure includes a paper holder, a foot pad, a paper ring, and a support block; wherein:

[0007] The paper tray has a receiving cavity therein for carrying the device to be packaged;

[0008] The paper ring is placed in the paper holder and is used to limit the wrapping of the packaging equipment;

[0009] The foot pad is placed at the bottom of the inner cavity of the paper ring to support the equipment to be packaged;

[0010] The support block is arranged between the paper holder and the paper ring to reinforce the corners of the liner structure.

[0011] The liner structure provided by the utility model is made of paper materials, is green and environmentally friendly, and solves the problem that the current columnar water tank uses EPS foam, which causes environmental pollution and is not environmentally friendly.

[0012] As a further improvement of the present invention, the height of the paper ring is equal to the height of the paper support.

[0013] As a further improvement of the present invention, the foot pad is a disc-shaped structure.

[0014] As a further improvement of the present invention, the foot pad is provided with a plurality of avoidance grooves along the circumference.

[0015] As a further improvement of the present invention, the avoidance groove is a ring-sector structure.

[0016] As a further improvement of the present invention, the foot pad is an integrally processed structure; or, the foot pad is a combined structure, including a base plate and a top plate, and a plurality of avoidance notches are arranged on the top plate along the circumferential direction, and the top plate is fixed on the top of the base plate to form the avoidance groove between the two.

[0017] As a further improvement of the present invention, the support block is a triangular structure, formed by folding cardboard multiple times.

[0018] As a further improvement of the present invention, the support block includes a first bending section, a second bending section, a first straight edge contact section, an arc-shaped contact section, a second straight edge contact section, a third bending section and a fourth bending section arranged in sequence; wherein:

[0019] The first bending section and the second bending section are arranged at an angle of 90 degrees;

[0020] The third bending section and the fourth bending section are arranged at an angle of 90 degrees;

[0021] The first bending section, the second bending section, the third bending section, and the fourth bending section are arranged in mirror symmetry;

[0022] One end of the first straight-edge contact segment is connected to the second bent segment, and the other end is connected to one end of the arc-shaped contact segment;

[0023] One end of the second straight-edge contact segment is connected to the third bent segment, and the other end is connected to the other end of the arc-shaped contact segment.

[0024] As a further improvement of the present invention, the curvature of the arc-shaped contact segment is adapted to the curvature of the paper ring.

[0025] As a further improvement of the present invention, the cushion structure is made of honeycomb paperboard or corrugated paperboard.

[0026] The padding structure of the utility model is a padding for packaging a cylindrical water tank or a cylindrical air conditioner, which is assembled from multiple components. The materials of the multiple components are various types of paper. The foot pad is punched out of a piece of cardboard or bonded together with several pieces of cardboard. The foot pad has a base foot avoidance groove. The paper ring is made by processing a piece of cardboard into an arc and then applying a fixing glue to overlap and form a circular ring. The inner wall of the paper ring fits the outer surface of the bottom of the cylindrical water tank. The support block is formed by processing a piece of cardboard with an indentation line and a curved surface and then folding it to form a right angle with the outer surface of the paper ring and the paper support. The three-dimensional structure is fitted. The paper support is made by folding a piece of cardboard after processing the indentation line. The length and width inside the paper support are kept consistent, and the various structures can be manufactured simultaneously. During assembly, the support blocks are installed at the four right angles inside the paper support according to the principle of fitting. Then the paper ring is placed in the paper support. Finally, the foot pad is placed at the bottom of the paper ring to obtain a padding structure for packaging cylindrical water tanks. The padding is made entirely of paper materials, which has little pollution to the environment and can be recycled and reused. The production cost is low, the structural assembly process is simple, and it is easy to operate. There is a yield groove on the foot pad corresponding to the position of the cylindrical water tank base, so that the foot pad can fully support the bottom of the water tank, solving the problem in the prior art that the water tank base has a small contact area with the EPS foam, which makes it easy for the base to crush the EPS foam. The cylindrical water tank pad of this utility model has a short production cycle and reusable manufacturing materials. It is a green and environmentally friendly packaging method and provides a new option for cylindrical water tank packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a three-dimensional structural diagram of the liner structure of the utility model;

[0029] Figure 2 It is a top view of the liner structure of the utility model;

[0030] Figure 3 This is a schematic diagram of the explosion structure of the liner structure of the utility model;

[0031] Figure 4 This is the main exploded view of the liner structure of the utility model;

[0032] Figure 5 This is a structural diagram of an embodiment of a foot pad in the pad structure of the utility model;

[0033] Figure 6This is a structural diagram of another embodiment of the foot pad in the pad structure of the utility model;

[0034] Figure 7 This is a schematic diagram of the structure of the liner structure of the utility model when the support blocks are unfolded;

[0035] Figure 8 This is a front view of the support block in the liner structure of the utility model when it is unfolded;

[0036] Figure 9 This is a top view of the support block in the liner structure of the utility model when it is unfolded;

[0037] Figure 10 It is a side view of the support block in the liner structure of the utility model when it is unfolded;

[0038] Figure 11 This is a diagram of the processing method of the support block in the liner structure of the utility model.

[0039] In the figure, 1, paper support; 2, paper ring; 3, foot pad; 31, avoidance groove; 4, support block; 41, first bending section; 42, second bending section; 43, first straight edge contact section; 44, arc contact section; 45, second straight edge contact section; 46, third bending section; 47, fourth bending section. DETAILED DESCRIPTION

[0040] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0041] like Figures 1-11 As shown, the present invention provides a cushioning structure made of paper. By using paper to make the entire cushioning structure, it is environmentally friendly and solves the environmental pollution and environmental issues caused by the use of EPS foam in current cylindrical water tanks. Specifically, the cushioning structure of the present invention includes a paper support 1, a foot pad 3, a paper ring 2, and a support block 4.

[0042] The paper tray 1 has a cavity for holding the equipment to be packaged, specifically the bottom of a cylindrical water tank. The paper tray 1 is made of a base plate and four side plates that are nailed or overlapped, with the length and width of the interior of the paper tray 1 being consistent. In this embodiment, the equipment to be packaged can be an air-energy water tank, an electric water heater, or other cylindrical electrical equipment.

[0043] The paper ring 2 is placed in the paper holder 1 and is used to wrap and position the device to be packaged. Since the devices to be packaged in this embodiment are all cylindrical, the paper ring 2 has a circular ring structure, and the specifications of the inner cavity are adapted to the specifications of the device to be packaged, thereby completely wrapping the device and playing a role in limiting and fixing the device. The paper ring 2 is cut from a round paper tube, and its inner wall fits the outer surface of the bottom of the cylindrical water tank.

[0044] The foot pad 3 is placed at the bottom of the inner cavity of the paper ring 2 to support the equipment to be packaged; during packaging, the bottom of the equipment to be packaged abuts against the foot pad 3, thereby using the foot pad 3 to support the entire water tank;

[0045] The support block 4 is arranged between the paper support 1 and the paper ring 2 to strengthen the corners of the cushioning structure. The support block 4 is a three-dimensional structure that fits the outer surface of the paper ring 2 and the right angles of the paper support 1 after the indentation lines and curved surfaces are processed on a piece of cardboard and then folded. The support blocks 4 are evenly distributed at the four right angles inside the paper support 1. The support block 4 plays the role of support, protection and limitation in this structure, so it is necessary to adopt a face-to-face contact method with the paper ring 2 as much as possible. The manufacturing material of the support block 3 is a piece of cardboard of appropriate size determined according to the shape of the product. In order to be able to fold the cardboard into a three-dimensional structure later, the first step of the processing is to pre-process the indentation lines in the places that need to be folded (the factory has special indentation equipment to achieve this step, which is not described in this article). After the indentation lines for folding are processed, the second step is to process an arc surface in the middle part of the cardboard (this arc surface is processed in order to achieve surface contact with the paper ring, thereby increasing the contact area with the paper ring). For the second step, this application describes two processing methods: Figure 11 As shown, the first implementation method involves providing a set of tooling dies with a concave and convex center. After the cardboard has completed the first step of processing, it is placed between two dies. Pressure is applied to the two dies, and the concave and convex dies squeeze the cardboard's center into a curved surface, thus achieving the processing goal. The second implementation method involves continuing to use the creasing equipment to create denser horizontal lines in the cardboard's center. The goal is to divide the larger center area of ​​the cardboard into several smaller rectangles, which are then manually shaped into an arc (similar to understanding a curve divided infinitely into several line segments, so this arc can be approximated as a series of small rectangles).

[0046] For the sake of aesthetics and stability of the package, in this embodiment, the height of the paper ring 2 is equal to that of the paper holder 1 , that is, the top of the paper ring 2 is flush with the top edge of the paper holder 1 .

[0047] In this embodiment, the packaging device is a cylindrical structure. In order to save materials, in this embodiment, the foot pad 3 is a disc-shaped structure, and the diameter of the foot pad 3 is equal to the inner diameter of the paper ring 2.

[0048] Taking into account that the equipment to be packaged, such as a water tank, has a base at the bottom, and in order to ensure the stability of the packaging and increase the packaging area, in this embodiment, the foot pad 3 is provided with a plurality of avoidance grooves 31 along the circumference, and the foot pad 3 is designed with avoidance grooves 31 for the columnar water tank base feet. Each base foot of the water tank can fall into the avoidance groove 31 respectively, thereby increasing the support area of ​​the bottom of the columnar water tank and avoiding the water tank from tipping over due to the base foot crushing the liner due to too small a contact area during transportation or storage.

[0049] The escape groove 31 is dug inward from the edge of the foot pad 3. Furthermore, the depth of the escape groove 31 is equal to the height between the base and the bottom of the water tank. This ensures that when the water tank is placed on the foot pad 3, its base is located within the escape groove 31, while the bottom of the water tank can abut against the surface of the foot pad 3, thereby providing support, load, and protection for the water tank.

[0050] In this embodiment, the avoidance groove 31 is a ring-sector structure. It should be noted that the shape, number and spacing of the avoidance groove 31 are not limited in this embodiment and can be designed and adjusted according to the number and spacing of the base feet of the packaging equipment.

[0051] like Figure 5 As shown, as an optional embodiment of the present invention, the foot pad 3 is an integrated processing structure, which is made by cutting and punching a piece of cardboard;

[0052] like Figure 6 As shown, as another optional embodiment of the present invention, the foot pad 3 is a combined structure, which is made of several pieces of cardboard glued together, including a base plate and a top plate, and a plurality of avoidance gaps are set on the top plate along the circumferential direction. The top plate is fixed on the top of the base plate to form an avoidance groove between the two.

[0053] Furthermore, considering the cavities at the four corners of the paper ring 2 and paper support 1, and to prevent the packaging equipment from tipping or tilting due to these corner cavities and weak areas when supported by the paper ring 2, in this embodiment, support blocks 4 are triangular in structure, formed from cardboard that has been folded multiple times. Support blocks 4 fill the gap between the paper ring 2 and paper support 1, not only preventing packaging gaps but also increasing the strength of the cushioning structure. Support blocks 4 are positioned between the paper ring 2 and paper support 1, fitting into both. Made from processed and folded cardboard, they provide support and position control for the paper ring 2.

[0054] In order to facilitate processing and reduce production costs, in this embodiment, Figure 7-10As shown, the support block 4 is formed by bending a piece of cardboard multiple times, and creases are added in advance at the bends; after folding, the support block 4 has a triangular structure as a whole, and has two triangular support holes inside; since the triangular structure is relatively stable, in this embodiment, the support block 4 adopts an overall triangular structure, and two symmetrical triangular support holes are formed inside when bending, thereby improving the overall strength and stability of the support block 4; Figure 1 and Figure 2 As shown, the support block 4 includes a first bending section 41, a second bending section 42, a first straight edge contact section 43, an arc-shaped contact section 44, a second straight edge contact section 45, a third bending section 46 and a fourth bending section 47, which are arranged in sequence; wherein:

[0055] The first bending section 41 and the second bending section 42 are arranged at a 90-degree angle; and the end of the first bending section 41 abuts against the inner side of the first straight edge contact section 43, thereby forming a triangular support hole between the first bending section 41, the second bending section 42 and the first straight edge contact section 43;

[0056] The third bend section 46 and the fourth bend section 47 are arranged at a 90-degree angle, and the second bend section 42 and the fourth bend section 47 are arranged back to back. The end of the fourth bend section 47 abuts against the second straight-edge contact section 45, thereby forming a triangular support hole between the third bend section 46, the fourth bend section 47 and the second straight-edge contact section 45.

[0057] The first bending section 41, the second bending section 42, the third bending section 46, and the fourth bending section 47 are arranged in mirror symmetry;

[0058] One end of the first straight contact section 43 is connected to the second bent section 42 , and the other end is connected to one end of the arc-shaped contact section 44 ;

[0059] One end of the second straight-edge contact segment 45 is connected to the third bent segment 46 , and the other end is connected to the other end of the arc-shaped contact segment 44 .

[0060] To ensure the supporting effect, in this embodiment, the curvature of the arc-shaped contact section 44 matches the curvature of the paper ring 2 , and the straight edges of the first straight edge contact section 43 and the second straight edge contact section 45 are in contact with the inner wall of the paper holder 1 .

[0061] like Figure 11 As shown in the figure, a method for processing the support block 4 is shown. After the first step of processing, the cardboard obtained is a flat structure. After the second step of processing by the creasing equipment, the creasing line is processed on the cardboard; finally, it is placed between two molds (upper concave mold and lower punch), and then the upper and lower molds are squeezed to process the arc-shaped contact section 44 in the middle of the cardboard.

[0062] As a further improvement of the present invention, the padding structure is made of honeycomb paperboard or corrugated paperboard.

[0063] It should be noted that the specifications, dimensions, material thickness and material type of the foot pad 3, paper ring 2, support block 4 and paper holder 1 in the present invention are not limited and are selected according to the external dimensions, weight and volume of the packaged equipment.

[0064] The utility model is a liner structure for packaging a cylindrical water tank, an air-energy water heater, a water heater tank or a cylindrical air conditioner. The liner structure is assembled from a plurality of parts, the materials of which are various papers. The foot pad is punched from a piece of cardboard or bonded together from several pieces of cardboard. The foot pad has a base foot avoidance groove. The paper ring is made by overlapping a piece of cardboard after processing it into an arc shape and applying a fixing glue to form a circular ring. The inner wall of the paper ring fits the outer surface of the bottom of the cylindrical water tank. The support block is formed by folding a piece of cardboard after processing the indentation line and the curved surface to fit the outer surface of the paper ring and the outer surface of the paper ring. The three-dimensional structure of the paper support is fitted at right angles. The paper support is made by folding a piece of cardboard after processing indentation lines. The length and width inside the paper support remain consistent, and each structure can be manufactured simultaneously. During assembly, the support blocks are installed at the four right angles inside the paper support according to the principle of fitting. Then the paper ring is placed in the paper support. Finally, the foot pad is placed at the bottom of the paper ring to obtain a cushioning structure for packaging cylindrical water tanks. The cushioning material is entirely paper, which has little pollution to the environment, can be recycled and reused, has low production costs, and the structural assembly process is simple and easy to operate. The foot pad has an avoidance groove at the position corresponding to the base of the cylindrical water tank, so that the foot pad can fully support the bottom of the water tank, solving the problem in the prior art that the base of the water tank has a small contact area with the EPS foam, which makes it easy for the base to crush the EPS foam. The cylindrical water tank liner of this utility model has a short production cycle and reusable manufacturing materials. It is a green and environmentally friendly packaging method and provides a new option for cylindrical water tank packaging.

[0065] The second method involves continuing to use the creasing machine to create dense horizontal lines in the center of the cardboard. This divides the larger area into several smaller rectangles, which are then manually shaped into an arc (similar to thinking of a curve divided infinitely into several line segments, so this arc can be approximated as a series of small rectangles).

[0066] The processing steps of the liner structure of the utility model are:

[0067] Step 1: The foot pad is made by cutting a piece of thick cardboard into a circle and then punching out a base foot avoidance groove; it can also be made by cutting the avoidance groove shape on a round piece of cardboard and then gluing it to another round piece of cardboard.

[0068] Step 2: The paper ring is made by cutting a round paper tube, and its inner wall is fitted with the outer surface of the bottom of the cylindrical water tank. The method of forming the round paper tube is not limited or required in this utility model;

[0069] Step 3: The support block is made by processing a piece of cardboard and folding it into shape. Since the support block needs to be in contact with the paper ring surface, in addition to processing the indentation line on the cardboard, a curved surface needs to be processed. When making it, first use the indentation die to process the indentation line at the position where the cardboard needs to be folded. Then, place the cardboard between the concave and convex molds and apply pressure to the molds to process the curved surface. Then, fold the cardboard along the indentation line into the predetermined shape; Figure 7-Figure 8 As shown, the present application provides another support block forming method, which can use an indentation die to process several indentation lines in the area where the curved surface is required, and then shape this area into a curved surface, and then fold the cardboard along the indentation lines into a predetermined shape.

[0070] Step 4: Making the paper tray. The paper tray is made by nailing or overlapping a bottom plate and four side plates. The specific forming method of the paper tray and the die ruler are not limited in this utility model. After the paper tray is formed, the length and width of its internal dimensions remain the same.

[0071] Step 5: Assemble the prepared foot pad, paper ring, and support block in the paper holder. Take four support blocks and install them at the four right angles of the paper holder according to the principle of fitting. Then install the paper ring between the four support blocks. Finally, install the foot pad in the paper ring so that it contacts the bottom of the paper holder. The foot pad, paper ring, support block, and paper holder fit tightly together and will not fall out. They can also be fixed with glue during assembly.

[0072] For the sake of universality, the present invention does not make specific requirements on the manufacturing dimensions of each component. If the packaged device is larger in size, the dimensions of each component are also larger. If the device is smaller in size, the dimensions of each component are correspondingly designed to be smaller, thereby ensuring that the gasket can play the role of packaging, containing, supporting and protecting the electrical equipment.

[0073] First of all, it should be noted that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached figures. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0076] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0077] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A liner structure, characterized in that: Made of paper material; the padding structure includes a paper holder, a foot pad, a paper ring, and a support block; wherein: The paper tray has a receiving cavity therein for carrying the device to be packaged; The paper ring is placed in the paper holder and is used to limit the wrapping of the packaging equipment; The foot pad is placed at the bottom of the inner cavity of the paper ring to support the equipment to be packaged; The support block is arranged between the paper holder and the paper ring to reinforce the corners of the liner structure.

2. The pad structure according to claim 1, wherein: The height of the paper ring is equal to the height of the paper support.

3. The pad structure according to claim 1, wherein: The foot pad is a disc-shaped structure.

4. The liner structure according to claim 1 or 3, characterized in that: The foot pad is provided with a plurality of avoidance grooves along the circumference.

5. The pad structure according to claim 4, characterized in that The avoidance groove is a ring-sector structure.

6. The pad structure according to claim 4, characterized in that The foot pad is an integrally processed structure; or, the foot pad is a combined structure, including a base plate and a top plate, a plurality of avoidance notches are arranged on the top plate along the circumferential direction, and the top plate is fixed on the top of the base plate to form the avoidance groove between the two.

7. The pad structure according to claim 1, wherein: The support block is a triangular structure formed by folding paperboard multiple times.

8. The pad structure according to claim 7, characterized in that The support block includes a first bending section, a second bending section, a first straight edge contact section, an arc-shaped contact section, a second straight edge contact section, a third bending section and a fourth bending section, which are arranged in sequence; wherein: The first bending section and the second bending section are arranged at an angle of 90 degrees; The third bending section and the fourth bending section are arranged at an angle of 90 degrees; The first bending section, the second bending section, the third bending section, and the fourth bending section are arranged in mirror symmetry; One end of the first straight-edge contact segment is connected to the second bent segment, and the other end is connected to one end of the arc-shaped contact segment; One end of the second straight-edge contact segment is connected to the third bent segment, and the other end is connected to the other end of the arc-shaped contact segment.

9. The pad structure according to claim 8, characterized in that The curvature of the arc-shaped contact segment is adapted to the curvature of the paper ring.

10. The pad structure according to claim 1, wherein The lining structure is made of honeycomb paperboard or corrugated paperboard.

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