Tampon and preparation method

Abstract

The embodiment of the invention provides a tampon which comprises a main body, the main body comprises a main absorption body which is formed by winding a main absorption sheet and provided with a central part, the central part further comprises an absorption structure body clamped by the main absorption sheet, the absorption structure body comprises SAP and a secondary absorption sheet, and the softness of the secondary absorption sheet is smaller than that of the main absorption sheet. The main body further comprises a groove part, through the arrangement, on one hand, the main absorption sheet located on the inner side and the main absorption sheet located on the outer side form fold spaces, space is provided for moistening and swelling, meanwhile, the secondary absorption sheet provides expansion space for moistening and swelling of SAP, the probability that the outer surface is bulged and the like is greatly reduced, and the use comfort is improved; meanwhile, in the structure, the diffusion time required by body fluid is shortened, the liquid absorption efficiency is improved, longer secondary absorption sheets can be arranged, so that the absorption amount is improved, in addition, the structure can enable the main body to keep the structural state and strength, and the invention also provides a preparation method of the tampon.

Description

Technical Field

[0001] The present invention relates to a tampon and a method for preparing the same. Background Art

[0002] Menstrual tampons for intravaginal use have been widely used because of their hygiene, non-protrusion and comfortable wearing.

[0003] Tampons are generally made of absorbent fibers, are generally cylindrical in shape, and are provided with outer grooves or channels on their exteriors to increase the surface area of the tampon for absorption. These grooves or channels can be formed by compressing the tampon body, specifically as shown in the structures and forms in documents such as CN1531415A, DE102005050514A1, EP0149155A2, US8834439B2, etc.

[0004] It has been found that even when equipped with these grooves or channels, users still face the problem of insufficient absorption capacity of the tampon. One solution is to add a highly absorbent material such as SAP inside the tampon. However, generally, after adding SAP inside the tampon, due to the water absorption and swelling of SAP, two problems arise. One is that after SAP absorbs water and swells, it causes bulging in some areas or changes in the external shape of some areas, which in turn causes discomfort to the user. The other is that after SAP absorbs water and swells, it causes a change in the overall structure of the tampon. When pulling out the drawstring, the structure becomes further loose or some structures peel off, resulting in inconvenient use.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0006] The present invention provides a tampon to solve the above technical problems.

[0007] A tampon includes a main body having a length direction. The main body includes a main absorbent body formed by winding a main absorbent sheet and having a central portion. An absorbent structure body is further included in the central portion and is clamped by the main absorbent sheet. The absorbent structure body includes SAP disposed therein. The absorbent structure body includes sub-absorbent sheets stacked thereon, and the softness of the sub-absorbent sheets is less than that of the main absorbent sheet. At the same time, the main body further includes a groove portion disposed outside the main body and extending along the length direction.

[0008] Wherein, the main absorbent body includes a first annular body and a second annular body from the center outwards. The absorbent structure body is disposed between the first annular body and the second annular body, and the SAP is disposed between the stacked sub-absorbent sheets.

[0009] Wherein, the main body includes a center line, the main absorbent sheet is folded to form a folded body, the folded body includes a first end, the first end is adjacent to the center line, the main absorbent sheet includes a second end, and in the main absorbent body, the second end and the first end have an overlapping area.

[0010] Wherein, the absorbent structure is arranged in a spiral shape in the main absorbent body.

[0011] Wherein, the secondary absorbent sheet in the absorbent structure is folded to form a laminated structure.

[0012] Wherein, the groove portion includes a pair of first groove portions and second groove portions arranged in pairs. At the same time, a first concave portion is provided in the first groove portion, and a second concave portion is provided in the second groove portion.

[0013] Wherein, the first concave portion and the second concave portion are arranged in a staggered manner.

[0014] Wherein, the first concave portion includes a first concave point with the smallest distance from the center line and a first upper area and a first lower area located above and below the first concave point. At the same time, the second concave portion includes a second concave point with the smallest distance from the center line and a second upper area and a second lower area located above and below the second concave point. In the first upper area, the distance between the side line of the first concave portion and the center line gradually increases in the upward direction from the first concave point. In the first lower area, the distance between the side line of the first concave portion and the center line gradually increases in the downward direction from the first concave point. And, in the second upper area, the distance between the side line of the second concave portion and the center line gradually increases in the upward direction from the second concave point. In the second lower area, the distance between the side line of the second concave portion and the center line gradually increases in the downward direction from the second concave point.

[0015] Wherein, the first upper area and the second lower area are arranged corresponding to each other.

[0016] The present invention also provides a preparation method for preparing the above-mentioned tampon, including: S100: Laying the main absorbent sheet; S200: Stacking the secondary absorbent sheet on the main absorbent sheet; S300: Sprinkling SAP on the secondary absorbent sheet; S400: Folding the main absorbent sheet and the secondary absorbent sheet to form a folded body. In the folded body, the secondary absorbent sheet is folded to form a laminated absorbent structure, and the SAP is located inside the absorbent structure; S500: Starting from the absorbent structure, winding the folded body to form the main absorbent body; S600: Compressing the outside of the main absorbent body to form the groove portion.

[0017] Beneficial effects: An embodiment of the present invention provides a tampon, which includes a main body having a length direction. The main body includes a main absorbent body with a central part formed by winding a main absorbent sheet. In the central part, an absorbent structure body is further included, which is sandwiched by the main absorbent sheet. The absorbent structure body includes SAP disposed therein. The absorbent structure body includes a secondary absorbent sheet stacked thereon, and the softness of the secondary absorbent sheet is less than that of the main absorbent sheet. At the same time, the main body further includes a groove part disposed on the outer side of the main body and extending along the length direction. Through the above arrangement, on the one hand, the main absorbent sheet located inside and the main absorbent sheet located outside both form a wrinkled space to provide space for swelling. At the same time, the secondary absorbent sheet itself also provides an expansion space for the swelling of SAP, greatly reducing the probability of phenomena such as bulging on the outer surface and improving the comfort of use. At the same time, in this structure, the diffusion time required for body fluids is reduced, the liquid absorption efficiency is improved, and a longer secondary absorbent sheet can be arranged to increase the absorption capacity. In addition, this structure can enable the main body to maintain its structural state and strength. The present invention also provides a preparation method for preparing the tampon. Brief Description of the Drawings

[0018] Figure 1 Schematic three-dimensional view of the tampon according to the embodiment of the present invention; Figure 2 For Figure 1 Schematic cross-sectional view at A-A in; Figure 3 For Figure 2 Schematic cross-sectional view at B-B in; Figures 4 - 9 Schematic process diagram for preparing a tampon.

[0019] Explanation of the symbols of the illustrated elements: Tampon 10; Main body 20; Substrate 200; Center line 201; Central part 2011; First groove part 202; First concave part 2021; First concave point 2022; First upper area 2023; First lower area 2024; Second groove part 203; Second concave part 2031; Second concave point 2032; Second upper area 2033; Second lower area 2034; Main deformation area 204; Absorbent structure body 21; Secondary absorbent sheet 210; First end 2101; SAP 22; Main absorbent body 23; Head end 230; First layer annular body 231; Second layer annular body 232; Outer layer annular body 233; Main absorbent sheet 2300; Second end 2301; Coating layer 24; Pull-out rope 30; Compression claw 40; Blade body 400; Protruding part 401. Detailed Description of the Embodiment

[0020] Please refer to Figures 1 - 3, embodiments of the present invention provide a tampon 10, which is designed to be inserted into the vaginal cavity of a female to intercept and absorb body fluids and prevent these body fluids from leaving the vaginal cavity and causing contamination to the skin or clothing. The body fluids are specifically menstrual blood, blood, and other body fluids.

[0021] The tampon 10 includes a main body 20 and a withdrawal member. In this embodiment, the withdrawal member is a withdrawal cord 30 provided on the main body and extending outward from the main body. When needed, the user can grasp the withdrawal cord 30 and pull it outward to remove the main body 20 from the vaginal cavity. In a specific embodiment, the withdrawal cord 30 also has a knot to facilitate the user's use.

[0022] The main body 20 is generally cylindrical. It can be understood that in a specific embodiment, the cross-section of the main body 20 can specifically be circular, square, polygonal, or other suitable shapes. Preferably, the cross-section of the main body 20 is a centrally symmetric shape and has a center of symmetry, and the main body 20 has a center line 201 passing through the center of symmetry.

[0023] In addition, the main body 20 includes an insertion end and a withdrawal end. The withdrawal cord 30 extends outward from the withdrawal end. At the same time, the main body 20 has a length of about 30 mm to about 60 mm and a width of about 8 mm to about 30 mm. The length specifically refers to the length from the insertion end to the withdrawal end or from the withdrawal end to the insertion end along the extension direction of the center line 201, and the width refers to the maximum transverse cross-sectional dimension perpendicular to the center line 201.

[0024] The main body 20 includes a main absorbent body 23 formed by winding a main absorbent sheet 2300. The main absorbent sheet 2300 is a three-dimensional network structure formed by appropriately connecting absorbent fibers. The appropriate connection can be entanglement, interweaving, bonding, or welding.

[0025] Specifically, the absorbent fibers may include, but are not limited to, natural fibers and synthetic fibers. Specifically, they can include polyester; acetate; nylon; cellulose fibers, such as a mixture of wood pulp, cotton, rayon, viscose fiber, or other cellulose fibers. Among them, natural fibers may include, but are not limited to, wool, cotton, linen, hemp, and wood pulp. Wood pulp may include, but is not limited to, softwood pulp and hardwood pulp. At the same time, the wood pulp can also be modified to improve the inherent properties of the fibers and their processability, such as by crimping, bending, and / or hardening. In addition, it can be understood that the absorbent fibers may include blends of the above various fibers. For example, they can be formed by cellulose fibers such as cotton and rayon. At the same time, the ratio of the blended fibers can be selected according to actual needs.

[0026] Additionally, the absorbent fibers may have a fiber length ranging from about 5, 10, 15 or 20 mm to about 30, 40 or 50 mm. Meanwhile, the absorbent fibers may have a fiber size ranging from about 15 microns to about 28 microns, and the absorbent fibers may have a fineness ranging from about 1 or 2 to about 6 denier. Meanwhile, the absorbent fibers may have a circular, bi-lobed or tri-lobed cross-sectional configuration or any other configuration known to those skilled in the art. The bi-lobed configuration may have a cross-sectional profile that looks like a dog bone, while the tri-lobed configuration may have a cross-sectional profile that looks like a "Y".

[0027] It can be understood that when the absorbent fibers form a three-dimensional network structure by bonding or fusing, the main absorbent sheet 2300 further includes fibers with hot-melt properties dispersed among the absorbent fibers. These hot-melt fibers have components that will bond or fuse to the absorbent fibers. For ease of description, these hot-melt fibers are referred to as welding fibers. The welding fibers can be natural fibers or synthetic fibers, where the synthetic fibers include, but are not limited to, those made from polyolefins, polyamides, polyesters, rayon, acrylic resins, viscose fibers, regenerated cellulose, etc.

[0028] It can be understood that the ratio of absorbent fibers to hot-melt fibers can be any suitable ratio. For example, in a specific embodiment, the main absorbent sheet 2300 may include from about 70 wt% or 80 wt% to about 90 wt% or 95 wt% of absorbent fibers and from about 5 wt% or 10 wt% to about 20 wt% or 30 wt% of binder fibers.

[0029] It can be understood that the main absorbent sheet 2300 can be formed by processing methods such as air-laying, carding, wet-laying, needling, mechanical entanglement, hydroentangling, etc.

[0030] Meanwhile, the main absorbent sheet 2300 has a basis weight of 10 - 300 gsm and a thickness of 1 - 5 mm, and is wound to form the main absorbent body 23. The winding refers to the main absorbent sheet 2300 rotating around a rotation center and wrapping itself in a spiral shape. After winding, it forms a generally cylindrical shape. In this embodiment, the main absorbent sheet 2300 is wound around the center line 201 and forms a central part 2011 and a peripheral part surrounding the central part 2011. Among them, the central part 2011 is the area adjacent to the center line 201, and the peripheral part is the area outside the central part 2011.

[0031] It can be understood that through winding, the main absorbent sheet 2300 forms several layers, and each layer is defined as a complete annular body composed of the main absorbent sheet 2300.

[0032] For the convenience of description, a layer adjacent to the center line 201 is referred to as the first-layer annular body 231, a layer located outside the first-layer annular body 231 is referred to as the second-layer annular body 232, and the outermost layer is referred to as the outer-layer annular body 233. The inner side refers to the side adjacent to the center line 201, and the outer side refers to the side away from the center line 201.

[0033] A coating layer 24 is further provided outside the main absorber 23 to cover the main absorber 23 and fix the shape of the main absorber 23. At the same time, through the coating layer 24, it can be ensured that the fibers constituting the main absorber 23 do not directly contact the inner wall of the vaginal cavity of a female. In addition, the coating layer 24 can reduce the probability that various parts or components (such as fibers, SAP 22, etc.) constituting the main body 20 fall off from the main body 20 or further prevent the occurrence of the above situation.

[0034] It can be understood that the coating layer 24 should be liquid-permeable, and the so-called liquid-permeable means that body fluids can pass through the coating layer 24. At the same time, the coating layer 24 can be hydrophobic or hydrophilic. In a preferred embodiment, the coating layer 24 is hydrophilic.

[0035] In a specific embodiment, the coating layer 24 is formed of a non-woven material or a perforated film. The non-woven material may include, but is not limited to, materials such as natural fibers, synthetic fibers, or blends of natural fibers and synthetic fibers. Natural fibers may include, but are not limited to, rayon, cotton, wood pulp, linen, hemp, and cannabis. Synthetic fibers may include, but are not limited to, fibers such as polyester, polyolefin, nylon, polypropylene, polyethylene, polyacrylate, vinyl acetate, polyacrylate, cellulose acetate, or bicomponent fibers, such as bicomponent polyethylene and polypropylene fibers.

[0036] An absorption structure body 21 clamped by the main absorption sheet 2300 is further included in the central part 2011. The absorption structure body 21 includes SAP 22 dispersed in the absorption structure body 21. The absorption structure body 21 includes stacked secondary absorption sheets 210, and the softness of the secondary absorption sheets 210 is less than that of the main absorption sheet 2300.

[0037] Among them, SAP 22, also known as superabsorbent resin, refers to a water-absorbing material that can absorb dozens or even hundreds of times its own weight of water / saline solution. Generally, the superabsorbent resin is a salt of polyacrylic acid, such as a suitable polymer of at least one acrylic monomer and a vinyl monomer. In further specific embodiments, it may include, but is not limited to, polysulfethyl acrylate, poly(2-hydroxyethyl acrylate), polyacrylamide, polyacrylic acid and its alkali metal salts, poly(alkali metal salts of polyacrylic acid), starch-modified polyacrylic acid and its alkali metal salts, poly(starch-modified alkali metal salts of polyacrylic acid), hydrolyzed polyacrylonitrile and its alkali metal salts, poly(hydrolyzed polyacrylonitrile alkali metal salts), poly(alkali metal salts of vinyl alcohol polyacrylic acid) and its salts and mixtures thereof. The most preferred superabsorbent polymer is poly(alkali metal salts of polyacrylic acid), such as poly(sodium acrylate).

[0038] In this embodiment, the SAP 22 has a water absorption capacity of more than 50 g / g, and the SAP 22 has a particle size of 50 μm - 300 μm. The particle size refers to the average particle size of SAP 22. Specifically, in the present invention, "GB / T19077-2016 Laser Diffraction Method for Particle Size Analysis" can be introduced as a reference method to obtain the particle size of SAP 22, which will not be elaborated here.

[0039] The secondary absorbent sheet 210 is a three-dimensional network structure formed by appropriately connecting second fibers. The appropriate connection can be entanglement, interweaving, bonding or welding. Or, the secondary absorbent sheet 210 is a so-called porous foam sheet. Specifically, the porous foam sheet is a porous network sheet formed by polyHIPE or polyurethane. In a specific embodiment, the porous foam sheet is a thermosetting foam made by the polymerization of "high internal phase emulsion" (HIPE).

[0040] When the secondary absorbent sheet 210 is a three-dimensional network structure formed by appropriately connecting second fibers, the second fibers may include, but are not limited to, natural fibers and synthetic fibers. Specifically, it may include polyester; acetate; nylon; cellulose fibers, such as wood pulp, cotton, rayon, viscose fiber or a mixture of other cellulose fibers. Among them, natural fibers may include, but are not limited to, wool, cotton, linen, hemp and wood pulp. Wood pulp may include, but is not limited to, softwood pulp and hardwood pulp. At the same time, the wood pulp can also be modified to improve the inherent properties and processability of the fibers, such as by crimping, bending and / or hardening. In addition, it can be understood that the second fibers may include blends of the above various fibers. For example, it may be formed by cellulose fibers such as cotton and rayon. At the same time, the ratio of the blended fibers can be selected according to actual needs.

[0041] In addition, the secondary absorbent sheet 210 may further include welding fibers dispersed between the second fibers. The welding fibers may be natural fibers or synthetic fibers. Among them, the synthetic fibers include, but are not limited to, those made of polyolefins, polyamides, polyesters, rayon, acrylic resins, viscose fibers, regenerated cellulose, etc.

[0042] The secondary absorbent sheets 210 are stacked to form the absorbent structure 21. In this embodiment, the secondary absorbent sheets 210 in the absorbent structure 21 are folded to form a stacked structure, that is, the two secondary absorbent sheets 210 constituting the absorbent structure 21 are integrally formed.

[0043] At the same time, the SAP 22 is located between the stacked structures, that is, the absorbent structure 21 forms a sandwich structure of secondary absorbent sheet - SAP - secondary absorbent sheet.

[0044] Furthermore, the SAP 22 is only provided in the absorbent structure 21, and the SAP 22 is not provided in other areas of the main absorbent body 23.

[0045] Furthermore, in the absorbent structure 21, the mass ratio of the SAP 22 is 5% - 10% of the total weight of the absorbent structure 21.

[0046] In this embodiment, the absorbent structure 21 is clamped by the main absorbent sheet 2300. The meaning of "clamped" is that the absorbent structure 21 is in direct contact with the main absorbent sheet 2300 on its upper and lower sides in the main body 20 and is clamped by the main absorbent sheet 2300.

[0047] Furthermore, the absorbent structure 21 should be located outside the first annular body 231, and more specifically, between the first annular body 231 and the second annular body 232.

[0048] In addition, in this embodiment, the main absorbent sheet 2300 forms a clamping on the absorbent structure 21 after being folded. The main absorbent sheet 2300 forms a folded body after being folded. The folded body includes a first end 230. The first end 230 is adjacent to the center line 201. At the same time, the main absorbent sheet 2300 includes a second end 2301. In the main absorbent body 23, the second end 2301 and the first end 230 have an overlapping area to form a wrinkled area in the inner side adjacent to the center line 201 and the area adjacent to the second end 2301.

[0049] Furthermore, the second end 2301 is laid on the first end 230, that is, the second end 2301 is located outside the first end 230.

[0050] In this above-described arrangement, the absorption structure 21 is also arranged in a spiral shape, but the absorption structure 21 is arranged between the first-layer annular body 231 and the second-layer annular body 232. When the coating layer 24 is coated on the main absorber 23 to form the base body 200 and the base body 200 is compressed, the first-layer annular body 231 adjacent to the center line 201 will form a wrinkled area under the extrusion effect.

[0051] Please also refer to Figure 2 and Figure 3 , the main body 20 further includes a groove portion provided on the outer side of the main body 20 and extending along the length direction. On the one hand, the strength of the main body 20 can be improved through the groove portion. On the other hand, a void space area can be formed below the outer surface of the main body 20, and body fluid can accumulate in this area and be absorbed by the main body 20, rather than simply passing on the outer surface of the main body 20 and leaking from the body of the user of the sanitary tampon 10.

[0052] In addition, by providing the groove portion, the first-layer annular body 231 located at the central portion 2011 forms wrinkles under the extrusion effect during the formation of the groove. When the softness of the secondary absorption sheet 210 is less than that of the main absorption sheet 2300, the following four aspects of effects are formed: on the one hand, since the softness of the secondary absorption sheet 210 is less than that of the main absorption sheet 2300, during the formation of the groove, the secondary absorption sheet 210 and the absorption structure 21 are extruded and deformed to form a wrinkled space. When the SAP 22 swells by absorbing water, this part of the wrinkled space provides an initial space for swelling. At the same time, the first-layer annular body 231 of the inner-side wrinkles also provides a swelling space, that is, after the SAP22 absorbs water, it can swell and be extruded in the absorption structure 21 and the inner side direction, reducing the probability of forming bulges or protrusions on the outer side and improving the use comfort; on the second hand, in this structure, the SAP 22 is actually arranged at the second layer, and compared with being arranged at the very center, the distance is closer, which can reduce the diffusion time required for body fluid and improve the liquid absorption efficiency; on the third hand, since the circumference of the second layer is longer than that of the center, arranging it at the second layer enables a longer secondary absorption sheet 210 to be arranged, increasing the absorption capacity; on the fourth hand, it is found through research that when the above-described arrangement form is adopted, arranging it at this position enables the SAP to be wrapped multiple times and is subjected to the clamping action of the secondary absorption sheet and the main absorption sheet, greatly reducing the unexpected shedding situation. Compared with the existing conventional setting method, the SAP shedding rate is reduced by more than 83%.

[0053] At the same time, it can be seen that since the SAP is arranged between the layers of the secondary absorption sheet 210, when the SAP swells, it will not damage the structure of the main absorption sheet 2300, so that the main body 20 maintains its structural state and strength, especially there will be no breakage phenomenon during extraction.

[0054] In a specific embodiment, compared with the situation of directly disposing SAP 22 in the main body in the prior art, when the water absorption amount is the same, the phenomenon of uneven bulging on the outer surface is reduced by 37.4%. The uneven bulging phenomenon refers to the raised area on the outer surface of the main body compared with the surrounding area. In addition, compared with the form of directly disposing SAP on the main body, the phenomenon of peeling or damage of the main body is reduced by 12%.

[0055] The groove portion extends along the length direction of the main body 20 and has a uniform lateral cross-section in the radial depth direction. Preferably, the groove portion extends from the insertion end to the extraction end.

[0056] In this embodiment, an inner concave portion is further provided inside the groove portion. By means of the inner concave portion, a shape recessed toward the center line 201 is formed at the bottom of the groove portion, so that the density of the area corresponding to the inner concave portion is greater than the density of the areas corresponding to other positions at the bottom of the groove portion. And due to the extrusion effect of the inner concave portion, the fibers in the areas corresponding to the upper side and the lower side of the inner concave portion bulge, so that a relatively loose area is formed in this area, that is, a deformation space for the swelling of SAP is also provided in the longitudinal direction.

[0057] Furthermore, the groove portions are arranged in pairs. The groove portions arranged in pairs are respectively located on the left and right sides of the center line 201, and the depth directions of the groove portions arranged in pairs are both directly opposite to the center line 201. For the convenience of description, the groove portions arranged in pairs are respectively referred to as the first groove portion 202 and the second groove portion 203. At the same time, a first inner concave portion 2021 is provided in the first groove portion 202, and a second inner concave portion 2031 is provided in the second groove portion 203. Among them, the first inner concave portion 2021 and the second inner concave portion 2031 are arranged in a staggered manner. The meaning of the staggered arrangement is that the position of the first inner concave portion 2021 in the vertical direction is different from the position of the second inner concave portion 2031 in the vertical direction, so that the first inner concave portion 2021 and the second inner concave portion 2031 do not form a high-density area at the same position.

[0058] Further, the first concave portion 2021 includes a first concave point 2022 closest to the center line 201, and a first upper region 2023 and a first lower region 2024 located above and below the first concave point 2022. At the same time, the second concave portion 2031 includes a second concave point 2032 closest to the center line 201, and a second upper region 2033 and a second lower region 2034 located above and below the second concave point 2032. In the first upper region 2023, the distance between the side line of the first concave portion 2021 and the center line 201 gradually increases in the upward direction from the first concave point 2022. In the first lower region 2024, the distance between the side line of the first concave portion 2021 and the center line 201 gradually increases in the downward direction from the first concave point 2022. Also, in the second upper region 2033, the distance between the side line of the second concave portion 2031 and the center line 201 gradually increases in the upward direction from the second concave point 2032. In the second lower region 2034, the distance between the side line of the second concave portion 2031 and the center line 201 gradually increases in the downward direction from the second concave point 2032.

[0059] Further, the side line of the first concave portion 2021 is arc-shaped, and the side line of the second concave portion 2031 is also arc-shaped.

[0060] Further, the first upper region 2023 and the second lower region 2034 are correspondingly arranged, and a deformation region is formed in this area. In this region, bulges or displacements occur between the fibers constituting the main absorber 23. In particular, the first annular body 231 is not only subjected to circumferential extrusion, but also subjected to extrusion and folding along the extending direction of the center line 201, so that a space for the swelling of the SAP 22 is formed in the middle region.

[0061] Adopting the above arrangement form makes the extraction rope bend inside the main body, thereby further increasing the holding effect of the extraction rope in the main body and further preventing the main body from being damaged or peeled off during the extraction process.

[0062] Further, the first concave portion 2021 and the second concave portion 2031 have an opening width of at least 3 mm and a depth of at least 1 mm. More preferably, the first concave portion 2021 and the second concave portion 2031 have an opening width of 3.5 mm to 8 mm and a depth of 1.5 mm to 3 mm, so that the first upper region 2023 and the second lower region 2034 can cause sufficient bulges or displacements between the fibers of the main absorber 23, thereby providing sufficient space for the swelling of the SAP.

[0063] Further, a plurality of first grooves are provided on the secondary absorbent sheet 210, and the SAP 22 is arranged in the first grooves.

[0064] Further, a plurality of second grooves are also provided on the main absorbent sheet 2300. By providing the second grooves, on the one hand, the rate of body fluid passing through the layers is increased, and on the other hand, by providing the second grooves, SAP 22 has a larger swelling space.

[0065] Further, the distribution density of the second grooves on the first annular body 231 is greater than the distribution density on the outer annular body 233, and the distribution density refers to the ratio of the number of the second grooves on the corresponding layer to the area.

[0066] Please refer to Figures 4 - 9 , Figures 4 - 9 , which shows the preparation process of the tampon 10. The tampon 10 of the present invention will be further described below in combination with the preparation method.

[0067] S100: Lay the main absorbent sheet 2300, and the main absorbent sheet 2300 includes a second end portion 2301.

[0068] The structure and formation method of the main absorbent sheet 2300 have been described above and will not be elaborated here.

[0069] S200: Stack the secondary absorbent sheet 210 on the main absorbent sheet 2300, and the secondary absorbent sheet 210 includes a first end portion 2101.

[0070] It can be understood that the first end portion 2101 is arranged adjacent to the second end portion 2301.

[0071] S300: Sprinkle SAP 22 on the secondary absorbent sheet 210.

[0072] In this embodiment, the secondary absorbent sheet 210 includes an upper surface, and SAP 22 is sprinkled on the upper surface. In other embodiments, SAP 22 can also be sprinkled inside the secondary absorbent sheet 210. For example, a negative pressure device is arranged below the secondary absorbent sheet 210 so that at least a part of SAP 22 enters the inside of the secondary absorbent sheet 210 under the action of air flow.

[0073] S400: Fold the main absorbent sheet 2300 and the secondary absorbent sheet 210 to form a folded body. In the folded body, the secondary absorbent sheet 210 is folded to form a stacked absorbent structure, and SAP is located inside the absorbent structure.

[0074] It can be understood that in this embodiment, since the secondary absorbent sheet 210 is stacked on the main absorbent sheet 2300, when the main absorbent sheet 2300 is folded along the second end portion 2301, the secondary absorbent sheet 210 is folded along with it. When the secondary absorbent sheet 210 is folded, a part of the secondary absorbent sheet 210 is folded to form an absorbent structure, and a part of the secondary absorbent sheet covers SAP 22 when the absorbent structure is formed.

[0075] It is understandable that after folding the main absorbent sheet 2300, a leading end 230 is formed.

[0076] Furthermore, after folding the main absorbent sheet 2300, the main absorbent sheet 2300 completely wraps the absorbent structure 21.

[0077] S500: The wound folded body forms the main absorbent body 23.

[0078] It is understandable that a clamp can be used to hold the leading end 230, and the leading end 230 is rotated around an axis. The main absorbent sheet 2300 in the downstream direction of the leading end 230 will wrap around the formed wound body to form the main absorbent body 23.

[0079] It is understandable that after forming the main absorbent body 23, it further includes the step of covering the main absorbent body 23 with a covering layer 24.

[0080] S600: Compression is performed on the outside of the main absorbent body 23 to form a groove portion.

[0081] In this embodiment, a groove portion is formed by the radial movement of a plurality of compression claws 40 arranged around the main absorbent body 23. It is understandable that the compression claws 40 include a blade portion 400 for pressing against the edge of the main absorbent body 23 to form the groove portion.

[0082] Furthermore, when it is necessary to form a first groove portion 202 with a first concave portion 2021, the blade portion 400 includes a protruding portion 401. The first concave portion 2021 is formed in the first groove portion 202 by the protruding portion 401. It is understandable that the outward extension height of the protruding portion 401 is greater than other regions of the blade portion 400. At the same time, the shape of the protruding portion 401 matches the shape of the first concave portion 2021.

[0083] The above description is only the implementation manner of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, is equally included in the patent protection scope of the present invention.

Claims

1. A tampon, comprising a body having a longitudinal direction, characterized in that, The described main body includes a main absorbent body with a central part formed by winding a main absorbent sheet. An absorbent structure is also included in the central part and is clamped by the main absorbent sheet. The absorbent structure includes SAP disposed within the absorbent structure. The absorbent structure includes secondary absorbent sheets stacked thereon, and the softness of the secondary absorbent sheets is less than that of the main absorbent sheet. Meanwhile, the main body also includes a groove part disposed outside the main body and extending along the length direction.

2. The tampon according to claim 1, characterized in that, The described main absorbent body includes a first annular body and a second annular body from the center outwards. The absorbent structure is disposed between the first annular body and the second annular body, and the SAP is disposed between the stacked secondary absorbent sheets.

3. The tampon according to claim 2, characterized in that, The described main body includes a center line. The main absorbent sheet is folded to form a folded body. The folded body includes a first end, and the first end is adjacent to the center line. The main absorbent sheet includes a second end. In the main absorbent body, the second end and the first end have an overlapping area.

4. The tampon according to claim 3, characterized in that, The absorbent structure is spirally disposed in the main absorbent body.

5. The tampon according to claim 3, characterized in that, The secondary absorbent sheets in the absorbent structure are folded to form a stacked structure.

6. The tampon according to claim 3, characterized in that, The groove part includes a pair of first groove parts and second groove parts disposed opposite to each other. Meanwhile, a first concave part is disposed in the first groove part, and a second concave part is disposed in the second groove part.

7. The tampon according to claim 6, wherein The first concave part and the second concave part are arranged in a staggered manner.

8. The tampon according to claim 7, characterized in that, The first concave part includes a first concave point with the minimum distance from the center line, and a first upper area and a first lower area located above and below the first concave point. Meanwhile, the second concave part includes a second concave point with the minimum distance from the center line, and a second upper area and a second lower area located above and below the second concave point. In the first upper area, the distance between the side line of the first concave part and the center line gradually increases from the first concave point towards the upper side. In the first lower area, the distance between the side line of the first concave part and the center line gradually increases from the first concave point towards the lower side. Also, in the second upper area, the distance between the side line of the second concave part and the center line gradually increases from the second concave point towards the upper side. In the second lower area, the distance between the side line of the second concave part and the center line gradually increases from the second concave point towards the lower side.

9. The tampon according to claim 8, wherein The first upper area and the second lower area are correspondingly arranged.

10. A preparation method for preparing the tampon according to claim 1, characterized in that, Including: S100: Lay the main absorbent sheet; S200: Stack the secondary absorbent sheets on the main absorbent sheet; S300: Sprinkle SAP on the secondary absorbent sheets; S400: Fold the main absorbent sheet and the secondary absorbent sheets to form a folded body. In the folded body, the secondary absorbent sheets are folded to form a stacked absorbent structure, and the SAP is located within the absorbent structure; S500: Start winding the folded body from the absorbent structure to form the main absorbent body; S600: Compress the outside of the main absorbent body to form the groove part.

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