A composite core

Abstract

The present disclosure relates to a composite core, which includes a body, the body includes a first surface layer, a second surface layer and a fluffy cloth layer, the fluffy cloth layer is located between the first surface layer and the second surface layer, and is connected to the first surface layer and the second surface layer respectively, the fluffy cloth layer extends along the length direction of the body, and has a plurality of bends distributed at intervals, the fluffy cloth layer bends along the thickness direction of the body at the bends, and the bending directions of two adjacent bends are opposite, so as to form a first accommodating area and a second accommodating area on both sides of the bends respectively, the first accommodating area and the second accommodating area are alternately arranged along the length direction of the body and are nested with each other; the first accommodating area is filled with a water-conductive material, and the second accommodating area is filled with a water-absorbent material. The present disclosure can effectively improve the absorption speed of the composite core, thereby improving the dryness and comfort of the absorbent product when it is used.

Description

Technical Field

[0001] The present disclosure relates to the technical field of absorbent cores, and in particular to a composite core. Background Art

[0002] A composite core is provided in diapers, sanitary napkins and other products for absorbing liquid. Existing composite core structures, such as CN207084912U, disclose a high-softness diaper absorbent core. The core comprises a non-woven fabric layer, an upper polymer layer, a fluffy fabric, a lower polymer layer and dust-free paper from top to bottom, and the non-woven fabric layer, the upper polymer layer, the fluffy fabric, the lower polymer layer and the dust-free paper are composited into an integrated rectangular composite structure.

[0003] In the composite core of this structure, the upper polymer layer, fluffy cloth and lower polymer layer are all laid flat. When in use, the liquid is first absorbed by the upper polymer layer, then transferred to the lower polymer layer through the fluffy cloth and then absorbed by the lower polymer layer. Since the liquid must pass through the upper polymer layer before being absorbed by the lower polymer layer, the overall absorption speed of the composite core is restricted by the absorption capacity of the upper polymer layer, and the absorption capacity of the lower polymer layer is not fully utilized, resulting in a slow absorption speed of the composite core as a whole. In particular, when the upper polymer layer is clogged due to excessive liquid absorption, the absorption speed of the composite core will be significantly reduced, and even the phenomenon of being unable to continue to absorb liquid will occur, affecting the normal use of the absorption sample. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention aims to provide a composite core. The present invention provides a first accommodating area and a second accommodating area which are nested with each other and filled with a water-conductive material and a water-absorbent material respectively. When in use, the water-conductive material can quickly guide the liquid to the water-absorbent material at the bottom for absorption, and then the water-absorbent materials at the top and bottom can be used to absorb the liquid at the same time, which can effectively improve the absorption speed of the composite core, thereby improving the dryness and comfort of the absorbent product when in use.

[0005] A composite core disclosed in the present invention comprises a body, wherein the body comprises a first surface layer, a second surface layer and a fluffy fabric layer, wherein the fluffy fabric layer is located between the first surface layer and the second surface layer and is connected to the first surface layer and the second surface layer respectively, wherein the fluffy fabric layer extends along the length direction of the body and has a plurality of bends distributed at intervals, wherein the fluffy fabric layer is bent along the thickness direction of the body at the bends, and the bending directions of two adjacent bends are opposite, so as to form a first accommodating area and a second accommodating area on both sides of the bends respectively, and the first accommodating area and the second accommodating area are alternately arranged along the length direction of the body and are nested with each other;

[0006] The first accommodating area includes a first wide mouth portion close to the first surface layer and a first narrow mouth portion close to the second surface layer, the width of the first wide mouth portion is greater than the width of the first narrow mouth portion; the second accommodating area includes a second narrow mouth portion close to the first surface layer and a second wide mouth portion close to the second surface layer, the width of the second wide mouth portion is greater than the width of the second narrow mouth portion, and the first wide mouth portion and the second wide mouth portion at least partially overlap in the thickness direction of the body;

[0007] The first accommodating area is filled with water-conductive material, and the second accommodating area is filled with water-absorbent material.

[0008] Preferably, the fluffy cloth layer includes a first connecting section, a first bending section, a second connecting section and a second bending section in sequence along the length direction of the main body, the first connecting section is stacked and connected to the first surface layer, one end of the first bending section is connected to the first connecting section, and the other end is bent toward the direction close to the second surface layer and away from the first connecting section, the second connecting section is stacked and connected to the second surface layer, one end of the second connecting section is connected to the first bending section, and the other end is connected to the second bending section, one end of the second bending section is connected to the second connecting section, and the other end is bent toward the direction close to the first surface layer and away from the second connecting section.

[0009] Preferably, the first bending section and the second bending section are both bent and extended in a step-shaped manner, and the first bending section and the second bending section are symmetrical structures to each other along the central axis of the first accommodating area.

[0010] Preferably, the first bending segment includes a first fold line segment and a second fold line segment, one end of the first fold line segment is connected to the first connecting segment and forms a first obtuse angle with the first connecting segment, one end of the second fold line segment is connected to the first fold line segment and the other end is connected to the second connecting segment, and a second obtuse angle formed by the second fold line segment and the first connecting segment is greater than the first obtuse angle;

[0011] The second bending section and the first bending section are symmetrical structures along the central axis of the first accommodating area.

[0012] Preferably, the first bending section and the second bending section both extend in an arc shape, and the first bending section and the second bending section are symmetrical structures along the central axis of the first accommodating area.

[0013] Preferably, the length of the first wide mouth portion on the first surface layer is L1, and the length of the second narrow mouth portion on the first surface layer is L2, satisfying:

[0014] L2≥2*L1.

[0015] Preferably, the first containing area is filled with wood pulp, and the second containing area is filled with water-absorbing polymers.

[0016] Preferably, the first surface layer is made of dust-free paper or non-woven fabric, and the second surface layer is made of dust-free paper or non-woven fabric.

[0017] The composite core disclosed in the present invention has the advantage that the present invention sets a first accommodating area and a second accommodating area which are nested with each other, and the first accommodating area is wide at the top (the side close to the human body) and narrow at the bottom (the side away from the human body), while the second accommodating area is narrow at the top and wide at the bottom, so that the two areas are nested with each other at the end positions, and the first accommodating area and the second accommodating area are filled with water-conductive material and water-absorbent material respectively. When in use, liquid reaches the surface of the composite core and contacts with the water-conductive material and the water-absorbent material respectively. The liquid contacting the water-absorbent material will be absorbed, and the part contacting the water-conductive material will be quickly guided. With the nested structure, the water-conductive material in the first accommodating area will quickly guide the liquid to the bottom of the water-absorbent material for absorption, thereby the water-absorbent materials at the top and bottom can be used to absorb the liquid at the same time, which can effectively improve the absorption speed of the composite core, thereby improving the dryness and comfort of the absorbent product when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a composite core body described in Example 1;

[0019] Figure 2 is a schematic structural diagram of a composite core body described in Example 2;

[0020] Figure 3 This is a schematic diagram of the structure of a composite core described in Example 3.

[0021] Explanation of the accompanying drawings: 1-main body, 11-first surface layer, 12-second surface layer, 13-fluffy cloth layer, 131-first connecting section, 132-first bending section, 133-second connecting section, 134-second bending section, 1a-first accommodating area, 1a1-first wide mouth portion, 1a2-first narrow mouth portion, 1b-second accommodating area, 1b1-second narrow mouth portion, 1b2-second wide mouth portion. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, a composite core disclosed in the present invention comprises a main body 1, which is generally in the form of a long sheet and is composited on the substrate of an absorbent article to absorb liquid.

[0023] The body 1 specifically includes a first surface layer 11, a second surface layer 12 and a fluffy fabric layer 13. The fluffy fabric layer 13 is located between the first surface layer 11 and the second surface layer 12, and is connected to the first surface layer 11 and the second surface layer 12 respectively to form a three-layer composite structure.

[0024] It is defined that the first surface layer 11 is located on the side close to the human body, i.e. the inner side, when worn, and the second surface layer 12 is located on the side away from the human body, i.e. the outer side. The fluffy fabric layer 13 extends along the length direction of the main body 1, and has a number of bends distributed at intervals. The fluffy fabric layer 13 bends along the thickness direction of the main body 1 at the bends, i.e., it bends along an inclination / perpendicular direction to the length direction of the fluffy fabric layer 13, and the bending directions of two adjacent bends are opposite, i.e., for the first bend, the fluffy fabric layer 13 bends from the first surface layer 11 to the second surface layer 12, and for the second bend, the fluffy fabric layer 13 bends from the second surface layer 12 to the first surface layer 11, and they are alternately arranged to form a first accommodating area 1a and a second accommodating area 1b on both sides of the bend, respectively. The first accommodating area 1a and the second accommodating area 1b are alternately arranged along the length direction of the main body 1, and form a mutually nested structure.

[0025] Specifically, the first accommodating area 1a includes a first wide mouth portion 1a1 close to the first surface layer 11 and a first narrow mouth portion 1a2 close to the second surface layer 12, the width of the first wide mouth portion 1a1 is greater than the width of the first narrow mouth portion 1a2, that is, the first accommodating area 1a is wide at one end close to the first surface layer 11 and narrow at one end away from the first surface layer 11. The second accommodating area 1b includes a second narrow mouth portion 1b1 close to the first surface layer 11 and a second wide mouth portion 1b2 close to the second surface layer 12, the width of the second wide mouth portion 1b2 is greater than the width of the second narrow mouth portion 1b1, that is, the second accommodating area 1b is narrow at one end close to the first surface layer 11 and wide at one end away from the first surface layer 11. The first wide mouth portion 1a1 and the second wide mouth portion 1b2 at least partially overlap in the thickness direction of the body 1 to form the aforementioned nested structure.

[0026] The first containing area 1a is filled with a water-conductive material, and the second containing area 1b is filled with a water-absorbent material. The material filled in the first containing area 1a has better water conductivity than the material filled in the second containing area 1b, but less water absorption than the material filled in the second containing area 1b. The water-conductive material filled in the first containing area 1a mainly serves to guide the liquid to flow to the second containing area 1b, and the water-absorbent material filled in the second containing area 1b mainly serves to absorb the liquid.

[0027] Furthermore, in the present embodiment, the fluffy cloth layer 13 includes a first connecting section 131, a first bending section 132, a second connecting section 133 and a second bending section 134 in sequence along the length direction of the main body 1. The first connecting section 131 is stacked with the first surface layer 11 and connected by adhesive. One end of the first bending section 132 is connected to the first connecting section 131, and the other end is bent in a direction close to the second surface layer 12 and gradually away from the first connecting section 131, so that the fluffy cloth layer 13 is bent toward the second surface layer 12 at this location. The second connecting section 133 is stacked with the second surface layer 12 and connected by adhesive. One end of the second connecting section 133 is connected to the first bending section 132, and the other end is connected to the second bending section 134. One end of the second bending section 134 is connected to the second connecting section 133, and the other end is bent in a direction close to the first surface layer 11 and gradually away from the second connecting section 133, so that the fluffy cloth layer 13 is bent toward the first surface layer 11 at this location, forming the aforementioned alternating bending structure.

[0028] The first bending section 132 and the second bending section 134 are used to form an alternately bent structure of the fluffy fabric layer 13, thereby forming the aforementioned mutually nested first accommodating area 1a and second accommodating area 1b. The first bending section 132 and the second bending section 134 have at least the following three implementations:

[0029] Example 1

[0030] like Figure 1 As shown, the first bending section 132 and the second bending section 134 are both bent and extended in a step-shaped manner. Specifically, the first bending section 132 and the second bending section 134 are both stepped structures, so that the first accommodating area 1a is in a "T" shape, with the first wide mouth portion 1a1 at the upper part and the first narrow mouth portion 1a2 at the lower part, and at the same time, the second accommodating area 1b adjacent to the first accommodating area 1a is in an "inverted T" shape, with the second narrow mouth portion 1b1 at the upper part and the second wide mouth portion 1b2 at the lower part, and the first wide mouth portion 1a1 and the second wide mouth portion 1b2 are nested at both ends.

[0031] The first connecting section 131 and the second connecting section 133 are both in the shape of long sheets. The first connecting section 131 and the first surface layer 11 are stacked and bonded, and the second connecting section 133 and the second surface layer 12 are stacked and bonded.

[0032] The fluffy cloth layer structure of the present embodiment forms a first accommodating area 1a and a second accommodating area 1b structure. After the first accommodating area 1a is filled with a water-conductive material and the second accommodating area 1b is filled with a water-absorbent material, during the use of the composite core, the liquid first contacts the first surface layer 11, and passes through the first surface layer 11 to contact the water-conductive material in the first wide mouth portion 1a1 and the water-absorbent material in the second narrow mouth portion 1b1 respectively. The liquid contacting the water-absorbent material is directly absorbed by the water-absorbent material. Due to the mutually nested structure of the first accommodating area 1a and the second accommodating area 1b, the liquid contacting the water-conductive material is quickly conducted away from the first surface layer 11 under the guidance of the water-conductive material, and is conducted to the water-absorbent material located in the second wide mouth portion 1b2, that is, located in the lower layer, and is absorbed by the water-absorbent material there. In this way, the water-absorbent materials in the upper and lower parts can be fully utilized to absorb the liquid at the same time, thereby improving the absorption rate of the composite core.

[0033] Example 2

[0034] like Figure 2 As shown, the first bending section 132 is a two-section structure, including a first fold line section and a second fold line section, both of which are in the shape of long sheets, one end of the first fold line section is connected to the first connecting section 131, and forms a first obtuse angle with the first connecting section 131, that is, forms a first obtuse angle with the first surface layer 11, one end of the second fold line section is connected to the first fold line section, and the other end is connected to the second connecting section 133, the second fold line section and the first connecting section 131, that is, the first surface layer 11 form a second obtuse angle, the second obtuse angle is greater than the first obtuse angle, so that the width of the first wide mouth portion 1a1 close to the first surface layer 11 is greater than the width of the first narrow mouth portion 1a2 close to the second surface layer 12, and on the contrary, the width of the second wide mouth portion 1b2 at the lower part of the second accommodating area 1b is greater than the width of the second narrow mouth portion 1b1 at the upper part, so that the first accommodating area 1a and the second accommodating area 1b form the aforementioned mutually nested structure.

[0035] The second bending section 134 and the first bending section 132 are symmetrical structures along the central axis of the first accommodating area 1 a.

[0036] The fluffy fabric layer structure of this embodiment is similar to the fluffy fabric layer structure of embodiment 1 in terms of the principle of absorbing liquid, which can be understood by referring to the above description and will not be repeated here. The difference is that the two-stage structure can make the nesting surface of the first accommodating area 1a and the second accommodating area 1b an inclined surface. Compared with the vertical surface of embodiment 1, the structure of this embodiment can increase the nesting matching surface area of ​​the first accommodating area 1a and the second accommodating area 1b, and can also make the liquid diffuse from both sides to the water-absorbing material. The speed of guiding the liquid to diffuse to the water-absorbing material in the second accommodating area 1b is faster than that of the structure of embodiment 1, but the mold structure used to shape the fluffy fabric layer 13 is more complicated than that of embodiment 1.

[0037] Example 3

[0038] like Figure 3 As shown, the first bending section 132 and the second bending section 134 are both bent and extended in an arc shape, the first connecting section 131 is parallel to the first surface layer 11 and is stacked and connected with the first surface layer 11, one end of the first bending section 132 is connected to the first connecting section 131, and the other end is bent in an arc shape toward the direction of the second surface layer 12 to the end to connect with the second connecting section 133, the second connecting section 133 is stacked and connected with the second surface layer 12, and the second bending section 134 and the first connecting section 131 are arranged along the first accommodating area 1a The central axis is symmetrical with the first bending section 132, so that the first accommodating area 1a is in a "U" shape with an open upper end. In this structure, the width of the first accommodating area 1a gradually decreases from top to bottom to form the aforementioned first wide mouth portion 1a1 and first narrow mouth portion 1a2 structure. On the contrary, the width of the second accommodating area 1b gradually increases from top to bottom to form the aforementioned second wide mouth portion 1b2 and second narrow mouth portion 1b1 structure, and the first accommodating area 1a and the second accommodating area 1b are nested with each other at both ends.

[0039] The fluffy fabric layer structure of this embodiment is similar to the fluffy fabric layer structure of embodiment 1 in terms of the principle of absorbing liquid, which can be understood by referring to the above description and will not be repeated here. The difference is that the arc structure can make the nesting surface of the first accommodating area 1a and the second accommodating area 1b an arc surface. Compared with the vertical surface of embodiment 1, the structure of this embodiment can increase the nesting matching surface area of ​​the first accommodating area 1a and the second accommodating area 1b, and can also make the liquid diffuse from both sides to the water-absorbing material. The speed of guiding the liquid to diffuse to the water-absorbing material in the second accommodating area 1b is faster than that of the structure of embodiment 1, but the mold structure used to shape the fluffy fabric layer 13 is more complicated than that of embodiment 1.

[0040] The above three different implementations of the fluffy fabric layer 13 can all form a mutually nested structure of the first accommodating area 1a and the second accommodating area 1b, which can be selected and arranged according to actual conditions.

[0041] Furthermore, in this embodiment, the length of the first wide mouth portion 1a1 on the first surface layer 11 is L1, and the length of the second narrow mouth portion 1b1 on the first surface layer 11 is L2, satisfying:

[0042] L2≥2*L1.

[0043] Since the second narrow portion 1b1 is filled with absorbent material, the length of the second narrow portion 1b1 is set to be at least twice that of the first wide portion 1a1, so that the liquid can contact a larger area of ​​absorbent material at the first time, thereby increasing the amount of liquid absorbed at the first time and reducing reverse osmosis.

[0044] Furthermore, in this embodiment, the water-conductive material filled in the first accommodating area 1a is specifically wood pulp, and the water-absorbent material filled in the second accommodating area 1b is a water-absorbent polymer (SPA water-absorbent resin). Wood pulp has good water-conductive properties and is suitable as the water-conductive material of this embodiment. The water-absorbent polymer has excellent water-absorbent properties and can quickly absorb a large amount of liquid. The first surface layer 11 is made of dust-free paper or non-woven fabric material, and the second surface layer 12 is made of dust-free paper or non-woven fabric material. Dust-free paper and non-woven fabric are both commonly used surface layer materials and can be selected and set according to actual needs.

[0045] This embodiment also provides a processing method for processing the composite core, comprising the following steps:

[0046] The fluffy fabric layer 13 is formed with a plurality of bends at intervals by a mold, and the fluffy fabric layer 13 is bent along the thickness direction at the bends, and the bending directions of two adjacent bends are opposite, so as to form a first accommodating area 1a and a second accommodating area 1b on both sides of the bends, respectively, and the first accommodating area 1a and the second accommodating area 1b are alternately arranged along the length direction of the fluffy fabric layer 13 and are nested with each other;

[0047] Specifically, a matching mold is made according to the shape to be bent. For example, for the fluffy cloth layer structure of Example 1, an upper mold with a plurality of "T"-shaped protrusions is made, and a matching lower mold is made. During the production, the fluffy cloth layer 13 is placed in the lower mold, and the upper mold and the lower mold are closed and pressurized so that the fluffy cloth layer 13 is formed according to the shape of the mold, that is, the fluffy cloth layer structure as described in Example 1 is formed. Since the fluffy cloth layer 13 has a certain hardness, it is not easy to collapse after forming, and can maintain the shape without being subjected to a large external force.

[0048] After the first containing area 1a is filled with water-conductive material, the fluffy cloth layer 13 is compounded with the first surface layer 11 to close the first containing area 1a; after compounding with the first surface layer 11, the structure of the fluffy cloth layer 13 is more stable and less likely to deform due to the fixing effect of the first surface layer 11.

[0049] The fluffy cloth layer 13 compounded with the first surface layer 11 is turned over so that the opening of the second containing area 1b faces upwards. After the water-absorbent material is filled in the second containing area 1b, the water-absorbent material is scraped flat by a scraping wheel so that the water-absorbent material is fully filled into the second containing area 1b. Then, the fluffy cloth layer 13 is compounded with the second surface layer 12, so that the second containing area 1b is closed, and the composite core is cut according to the required width to obtain the composite core.

[0050] Furthermore, in this embodiment, during the assembly line processing, the fluffy cloth layer 13 needs to be transported, and the transport direction of the fluffy cloth layer 13 should be perpendicular to its length direction, thereby avoiding straightening the bent parts of the fluffy cloth layer 13 during the transportation process, so that the composite core of this embodiment can be processed on the assembly line.

[0051] The processing method of this embodiment is used to process the aforementioned composite core, and belongs to the same inventive concept as the aforementioned composite core, which can be understood with reference to the above description and will not be repeated here.

[0052] The present invention provides a first accommodating area 1a and a second accommodating area 1b which are nested with each other. The first accommodating area 1a is wide at the top (the side close to the human body) and narrow at the bottom (the side away from the human body), while the second accommodating area 1b is narrow at the top and wide at the bottom, so that the two areas are nested with each other at the end positions. The first accommodating area 1a and the second accommodating area 1b are filled with water-conductive material and water-absorbent material respectively. When in use, liquid reaches the surface of the composite core and contacts with the water-conductive material and the water-absorbent material respectively. The liquid contacting the water-absorbent material will be absorbed, and the part contacting the water-conductive material will be quickly guided. With the nested structure, the water-conductive material in the first accommodating area 1a will quickly guide the liquid to the bottom of the water-absorbent material for absorption. Therefore, the water-absorbent materials at the top and bottom can be used to absorb the liquid at the same time, which can effectively improve the absorption speed of the composite core, thereby improving the dryness and comfort of the absorbent product when in use.

[0053] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0054] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present disclosure.

Claims

1. A composite core, comprising a body, wherein the body comprises a first surface layer, a second surface layer and a fluffy fabric layer, wherein the fluffy fabric layer is located between the first surface layer and the second surface layer and is connected to the first surface layer and the second surface layer respectively, characterized in that: The fluffy fabric layer extends along the length direction of the body, and has a plurality of bends at intervals. The fluffy fabric layer is bent along the thickness direction of the body at the bends, and the bending directions of two adjacent bends are opposite, so as to form a first accommodating area and a second accommodating area on both sides of the bends, respectively. The first accommodating area and the second accommodating area are alternately arranged along the length direction of the body and are nested with each other; The first accommodating area includes a first wide mouth portion close to the first surface layer and a first narrow mouth portion close to the second surface layer, the width of the first wide mouth portion is greater than the width of the first narrow mouth portion; the second accommodating area includes a second narrow mouth portion close to the first surface layer and a second wide mouth portion close to the second surface layer, the width of the second wide mouth portion is greater than the width of the second narrow mouth portion, and the first wide mouth portion and the second wide mouth portion at least partially overlap in the thickness direction of the body; The first accommodating area is filled with water-conductive material, and the second accommodating area is filled with water-absorbent material.

2. The composite core according to claim 1, characterized in that: The fluffy cloth layer includes a first connecting section, a first bending section, a second connecting section and a second bending section in sequence along the length direction of the main body, the first connecting section is stacked and connected to the first surface layer, one end of the first bending section is connected to the first connecting section, and the other end is bent toward the direction close to the second surface layer and away from the first connecting section, the second connecting section is stacked and connected to the second surface layer, one end of the second connecting section is connected to the first bending section, and the other end is connected to the second bending section, one end of the second bending section is connected to the second connecting section, and the other end is bent toward the direction close to the first surface layer and away from the second connecting section.

3. The composite core according to claim 2, characterized in that: The first bending section and the second bending section are both bent and extended in a step-shaped manner, and the first bending section and the second bending section are symmetrical structures to each other along the central axis of the first accommodating area.

4. The composite core according to claim 2, characterized in that: The first bending segment includes a first fold line segment and a second fold line segment, one end of the first fold line segment is connected to the first connecting segment and forms a first obtuse angle with the first connecting segment, one end of the second fold line segment is connected to the first fold line segment and the other end is connected to the second connecting segment, and a second obtuse angle formed by the second fold line segment and the first connecting segment is greater than the first obtuse angle; The second bending section and the first bending section are symmetrical structures along the central axis of the first accommodating area.

5. The composite core according to claim 2, characterized in that: The first bending section and the second bending section are both bent and extended in an arc shape, and the first bending section and the second bending section are symmetrical structures to each other along the central axis of the first accommodating area.

6. The composite core according to any one of claims 1 to 5, characterized in that: The length of the first wide mouth portion on the first surface layer is L1, and the length of the second narrow mouth portion on the first surface layer is L2, satisfying: L2≥2*L1.

7. The composite core according to any one of claims 1 to 5, characterized in that: The first containing area is filled with wood pulp, and the second containing area is filled with water-absorbing polymer.

8. The composite core according to any one of claims 1 to 5, characterized in that: The first surface layer is made of dust-free paper or non-woven fabric, and the second surface layer is made of dust-free paper or non-woven fabric.

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