An absorbent core and its application

Abstract

The present invention relates to the field of sanitary products, and discloses an absorbent core and its application, including a central absorbent area and a peripheral absorbent area, wherein the peripheral absorbent area is arranged around the central absorbent area, the vertical height of the central absorbent area is lower than that of the peripheral absorbent area, and both areas are provided with a plurality of holes in the height direction. The present invention enables the absorbent core of the sanitary napkin to form a concave structure that is flat on the outside and sunken on the inside as a whole, thereby creating a larger volume of menstrual blood storage and absorption space; and the holes in the central absorbent area and the peripheral absorbent area show a change in diameter from the height direction, starting from the actual situation, while increasing the absorption rate and reducing the upward reverse osmosis of menstrual blood, it also ensures the comfort of the user.

Description

Technical Field

[0001] The present invention relates to the field of sanitary products, and more particularly to an absorbent core and its application. Background Art

[0002] For fertile women, the endometrium undergoes autonomous thickening, blood vessel proliferation, glandular growth and secretion, and endometrial collapse and shedding with bleeding about once a month. This usually lasts 2-7 days, and most of the time it lasts 3-5 days. Menstrual blood will be discharged from the body during menstruation, and disposable absorbent products need to be used to absorb the menstrual blood during this period.

[0003] Currently, disposable sanitary napkins are commonly used on the market to absorb menstrual blood. Sanitary napkins are mainly divided into sanitary napkins, menstrual pants or tampons, and each style of sanitary napkin has its own characteristics.

[0004] Among them, sanitary napkins and their absorbent cores are usually flat structures, which are tightly attached to underwear through the adhesive backing when used. Since they are worn close to the body, menstrual blood is often only absorbed close to the crotch. Although there is a barrier structure at the edge of the crotch to prevent side leakage, when the absorbent core at the crotch is saturated, menstrual blood will still overflow from the groin on both sides or flow to the back along the buttocks, causing side leakage and back leakage and forming a damp feeling. This phenomenon will not only dirty the underwear and even the outer pants, but also easily dirty the bed when wearing it to sleep, causing psychological pressure on female friends. For the product, the utilization rate of the absorbent core is low and the best use effect is not achieved.

[0005] As another commonly used sanitary napkin, menstrual pants are improved on the basis of conventional sanitary napkins. They are in the form of underwear that can be worn directly. The design of their core part, namely the absorbent core, is usually the same as that of sanitary napkins.

[0006] Finally, there are tampons. Existing tampons need to be placed inside the body for use. To prevent side leakage and toxic shock syndrome, tampons cannot be left in the vagina for more than 8 hours. For some young women, the use of tampons is more complicated than sanitary napkins and menstrual pants, and can easily cause a considerable psychological burden. These factors are also important reasons why tampons have not been widely used.

[0007] In view of the above-mentioned technical deficiencies, it is necessary to develop a new type of absorbent core with stronger water absorption and higher comfort in use. Summary of the invention

[0008] One of the purposes of the present invention is to provide an absorbent core to address the problems existing in the prior art, so as to overcome the problems of sanitary napkins in the prior art such as easy leakage, insufficient dryness and even physiological safety risks.

[0009] It is also an object of the present invention to provide an absorbent hygiene article comprising an absorbent core.

[0010] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0011] An absorbent core comprises a central absorbent region and a peripheral absorbent region, wherein the peripheral absorbent region is arranged around the central absorbent region, the vertical height of the central absorbent region is lower than that of the peripheral absorbent region, and both regions are provided with a plurality of holes in the height direction.

[0012] Specifically, the central absorption area is a fast infiltration layer, which is usually made of high-density fiber material. When worn, this area is mainly located below the vaginal opening. It can absorb the menstrual blood just discharged from the body and settle it to the bottom in the first time, playing a major absorption role; the peripheral absorption area is a fast absorption and water-locking layer, which is usually a high-molecular water-absorbing polymer SAP and wood pulp structure. When worn, this area is close to both sides of the lowest point of the crotch and the lower side of the buttocks. When the menstrual blood in the central absorption area is close to saturation, the menstrual blood can diffuse to the surrounding peripheral absorption area and be absorbed and blocked, reducing the risk of side leakage or back leakage.

[0013] In the present invention, the vertical height of the central absorption area is lower than that of the peripheral absorption area, so that the sanitary napkin absorption core forms a concave structure that is flat on the outside and sunken on the inside as a whole. This structure fully combines the external structure and physiological needs of the female reproductive organs, creates a larger volume of menstrual blood storage and absorption space, and significantly improves the absorption efficiency.

[0014] Furthermore, the two regions are provided with a plurality of holes in the height direction, so as to promote the infiltration of menstrual blood, increase the absorption rate and reduce the upward infiltration of menstrual blood, thereby effectively reducing the feeling of dampness and improving the comfort of the user.

[0015] As a further optimization solution of the present invention, the holes in the central absorption area are arranged to be wider at the top and narrower at the bottom.

[0016] As a further optimization solution of the present invention, the holes in the peripheral absorption area are narrow at the top and wide at the bottom.

[0017] As a further optimization scheme of the present invention, the central absorption area is 10% to 80% lower in vertical height than the peripheral absorption area to prevent the central absorption area from expanding after absorbing menstrual blood, thereby preventing the concave design of the absorption core from failing.

[0018] As a further optimization solution of the present invention, the central absorption area is 40% to 60% lower in vertical height than the peripheral absorption area to improve the practicality of the absorption core.

[0019] As a further optimization scheme of the present invention, the area of ​​the central absorption region accounts for 20%-60% of the total area of ​​the absorption core. Such absorption area is determined based on factors such as the distance between the vaginal opening and the bladder of a general female and the flow range of physiological menstrual blood.

[0020] As a further optimization solution of the present invention, the hole area on the surface of the central absorption area and the peripheral absorption area is 5mm 2 ~20mm 2 .

[0021] Specifically, the holes are evenly arranged, with the smallest width being about 1mm and the largest width being 4.5mm. The holes in the central absorption area are wide at the top and narrow at the bottom, which can promote the infiltration of menstrual blood and reduce the upward infiltration of menstrual blood; the holes in the peripheral absorption area, as the part in close contact with the user's skin, are narrow at the top and wide at the bottom, which can firstly absorb the infiltrated menstrual blood and prevent the menstrual blood from infiltrating back to the surface layer, reducing the feeling of dampness; secondly, the pore size is formed as small as possible on the surface layer, reducing the friction with the user's crotch skin and improving the comfort of use.

[0022] In some other embodiments of the present invention, the holes may also be polygonal with a single cross-sectional area, such as a cylindrical or prism shape, which can also play the basic effect of enhancing the absorption efficiency.

[0023] As a further optimization scheme of the present invention, the outer bottom wall of the central absorption area is provided with a diffusion layer material, and the diffusion layer material covers the bottom range of the central absorption area and extends to the outer bottom wall of the peripheral absorption area. The present invention utilizes the material characteristics of the fiber layer material to promote the infiltration of menstrual blood, and by setting the effective area of ​​the layer material, the menstrual blood that penetrates into the diffusion layer material can diffuse outward to the surrounding peripheral absorption area, thereby improving the utilization rate of the absorption core as a whole. The diffusion layer material can be a fiber material or other materials such as polypropylene. As long as it is a fabric that can guide the fluid, it can be applied to this technical solution, and it is not limited here.

[0024] As a further optimization scheme of the present invention, the absorbent core also includes a bottom film, and the bottom film should be a thin film of waterproof material, such as a PE bottom film, and the bonding part between the absorbent core and the bottom film is set at the four edges of the peripheral absorption area. In other words, in the present invention, the bonding part between the absorbent core and the bottom film is only at the periphery of the absorbent core. When the absorbent core is saturated with adsorption, since there is only peripheral bonding between the absorbent core and the bottom film, most of the middle area is hollow. Therefore, under the action of gravity, menstrual blood will be collected in the hollow area of ​​the bottom film, which further improves the utilization rate of the absorbent core and greatly reduces the risk of side leakage and rear leakage.

[0025] The second object of the present invention is to provide an absorbent sanitary product, which comprises the novel absorbent core, and the absorbent sanitary product further comprises a surface layer, which is arranged on the upper side of the absorbent core to help ensure the user's comfort. Specifically, any product using the novel absorbent core design of the present invention, such as sanitary napkins, menstrual pants and other products, falls within the scope of protection claimed by the present invention.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides an outer absorption area and a relatively low central absorption area, so that the absorbent core of the sanitary napkin forms a concave structure that is flat on the outside and sunken on the inside, thereby creating a larger menstrual blood storage and absorption space;

[0028] 2. The central absorption area and the peripheral absorption area are made of materials with different densities, which play the role of rapid infiltration in the middle and rapid absorption and water locking in the periphery, further reducing the risk of side leakage or rear leakage;

[0029] 3. The central absorption area and the peripheral absorption area are respectively provided with a plurality of funnel-shaped holes and positive cone-shaped holes in the height direction. Based on the actual situation, the absorption rate is increased, the upward reverse osmosis of menstrual blood is reduced, and the comfort of the user is ensured;

[0030] 4. The outer bottom wall of the central absorption area and the peripheral absorption area are connected with the same diffusion layer material, which utilizes the water absorption characteristics of the fiber material to facilitate the outward diffusion of menstrual blood and improve the utilization rate of the absorption core; 5. The bonding point between the present invention and the waterproof bottom film is only around the absorption core. When the absorption core is saturated with adsorption, menstrual blood can be retained in the hollow area of ​​the bottom film, which further improves the utilization rate of the absorption core and greatly reduces the risk of side leakage and rear leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 Schematic diagram of the appearance of the absorbent core of Example 1 (top view);

[0033] Figure 2 Schematic diagram of the appearance of an absorbent core of the present invention (top view);

[0034] Figure 3Schematic diagram of the appearance of another absorbent core of the present invention (top view);

[0035] Figure 4 Schematic diagram of the internal structure of the sanitary napkin of Example 1 (side cross-sectional view);

[0036] In the figure, 1-central absorption area; 11-funnel-shaped holes; 2-peripheral absorption area; 21-positive cone-shaped holes; 3-diffusion layer material; 4-surface layer; 5-bottom film. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] See also Figure 1 , Figure 4 This embodiment provides a sanitary napkin, the main body of which includes a surface layer 4 and an absorbent core from top to bottom, and a bottom film 5 is provided at the bottom of the absorbent core. The surface layer 4 is made of non-woven fabric and is fixedly connected to the absorbent core by peripheral bonding, and cotton wool with water absorption and buffering functions is filled between the two; the bottom film 5 is made of PE film and is fixedly connected to the bottom of the absorbent core.

[0040] Specifically, the absorbent core includes a central absorbent area 1 and a peripheral absorbent area 2. The central absorbent area 1 is arranged in a long strip from front to back, with a length of 100 mm, a width of 30 mm, and a thickness of 4 mm; the peripheral absorbent area 2 is arranged around the central absorbent area 1, and its size is similar to that of a conventional sanitary napkin body, with a thickness of 8 mm; thus, it can be seen that in the present invention, the absorbent core of the sanitary napkin forms a concave structure that is flat on the outside and sunken on the inside. When wearing a sanitary napkin, the female reproductive organs including the vaginal opening face the central absorbent area 1, and the sides of the crotch and the lower side of the buttocks are close to the peripheral absorbent area 2. The concave structure of the absorbent core can create a larger volume of menstrual blood storage and absorption space on the premise of preventing side leakage and back leakage, which significantly improves the absorption efficiency of menstrual blood.

[0041] It should be added that the shape of the peripheral absorption region 2 can be as follows: Figure 1 The butterfly core shown can also be used Figure 2 The long strip plane can also be formed by Figure 3 The cartoon-shaped plane and other graphics are not limited here.

[0042] Of course, in some other embodiments of the present invention, the plane shape of the central absorption area 1 can also be designed into different patterns such as circle, flower shape, etc. according to actual needs, which is not limited here.

[0043] Furthermore, the central absorption area 1 and the peripheral absorption area 2 are provided with a plurality of holes in the thickness direction to promote the infiltration of menstrual blood. Among them, the central absorption area 1 is provided with funnel-shaped holes 11, and the peripheral absorption area 2 is provided with regular cone-shaped holes 21. These holes are evenly distributed and do not penetrate, and their lowest point is about 1 mm away from the bottom wall of the absorption core to prevent excessive menstrual blood from seeping directly downward. It should be supplemented that the funnel-shaped holes and regular cone-shaped holes used in this embodiment are only a preferred option for enhancing the absorption effect. In actual application, the holes in the central absorption area 1 and the peripheral absorption area 2 can also be other structures such as pyramidal shapes, which are not specifically limited here.

[0044] In this embodiment, the minimum aperture of the funnel-shaped hole 11 and the right cone-shaped hole 21 is 0.4 mm, and the maximum aperture is 2.5 mm, which form an inverted cone and a right cone shape respectively by gradually changing the diameter. If the hole is too large, it will easily lead to insufficient support and weakened water absorption; if the hole is too small, it will make it difficult for menstrual blood to penetrate in time, causing the risk of side leakage.

[0045] It should be noted that the central absorption area 1 serves as a fast infiltration layer, and adopts a funnel-shaped hole 11 structure that is wide at the top and narrow at the bottom, which can accelerate the infiltration of menstrual blood and reduce the upward infiltration of menstrual blood; the peripheral absorption area 2 serves as a fast absorption and water-locking layer, and adopts a positive cone-shaped hole 21 structure that is narrow at the top and wide at the bottom. Firstly, it can quickly absorb the infiltrated menstrual blood and prevent the menstrual blood from infiltrating back to the surface layer, thereby improving dryness; secondly, it forms the smallest possible pore size on the surface layer, thereby reducing friction with the user's crotch skin and improving comfort.

[0046] In this embodiment, the central absorption area 1 is made of high-density fiber material, such as a composite material with cotton and pulp as the main components. This area is located below the vaginal opening when worn, and a material with high density and strong water absorption is required to absorb the menstrual blood just discharged from the body as quickly as possible and settle it to the bottom to play a major absorption role; the peripheral absorption area 2 is made of high-molecular water-absorbing polymer SAP and wood pulp material. This area is close to the two sides of the lowest point of the crotch and the lower side of the buttocks when worn, and needs to have a certain degree of softness. When the menstrual blood in the central absorption area 1 is close to saturation and diffuses outward, the peripheral absorption area 2 also plays a role in supplementary absorption and blocking to avoid side leakage or back leakage.

[0047] In this embodiment, the outer bottom wall of the central absorption area 1 is provided with a diffusion layer material 3, the area of ​​which is 120% to 150% of the central absorption area 1, which is slightly larger than the area of ​​the central absorption area 1, and extends outward to cover 20% to 50% of the bottom area of ​​the peripheral absorption area 2. The diffusion layer material 3 of this embodiment is made of fiber material, and is arranged in this way to utilize the water absorption characteristics of the material to accelerate the infiltration speed of menstrual blood in the central absorption area 1, and is conducive to diffusing menstrual blood to the peripheral absorption area 2, thereby improving the utilization rate of the absorption core.

[0048] In this embodiment, the bonding point between the absorbent core and the bottom film 5 is located on the four sides of the peripheral absorption area 2, and the actual bonding area is approximately 5%-15% of the area of ​​the absorbent core. Most of the middle area is hollow. Therefore, under the action of gravity, excess menstrual blood that leaks downward will be retained in the hollow area of ​​the bottom film 5, which further improves the utilization rate of the absorbent core and relieves the user's psychological burden.

[0049] Here, the working process is briefly described in combination with the structural composition of this embodiment:

[0050] When the user wears it while standing or sitting, there is a certain slope between the vaginal opening and the lowest point of the crotch, and when lying down, the vaginal opening and the bed will form an angle of about fifteen degrees. When menstrual blood is discharged from the body, it first contacts the central absorption area 1. Among them, when the flow rate is relatively small, the high-density fibers in the central absorption area 1 will quickly infiltrate the menstrual blood. When the flow rate is relatively large, due to its own slope, the menstrual blood will flow to the lowest point in the central absorption area 1 and diffuse to the peripheral absorption area 2. The peripheral absorption area 2 quickly absorbs and locks the menstrual blood. At the same time, the peripheral absorption area 2 is provided with a positive cone hole 21, and the central absorption area 1 is provided with a funnel-shaped hole 11. The holes of different shapes combined with each other can promote the infiltration of menstrual blood, reduce the upward reverse osmosis of menstrual blood, and reduce the feeling of moisture to keep dry.

[0051] In summary, this embodiment provides a new absorbent core designed according to the physiological structure and special physiological needs of women, which has multiple functions such as rapid absorption, improved utilization of the absorbent core, reduced risk of side leakage and rear leakage, and moisture permeability and dryness. This embodiment is cleverly designed, highly practical, and has wide application and promotion value.

[0052] Comparative Example 1

[0053] This comparative example conducts water absorption tests for different hole widths. The specific steps are to evenly pour 200 ml of blue water into the central absorption area, calculate the water absorption speed of the absorption core according to the color penetration degree, and observe the reverse osmosis amount and diffusion area of ​​the absorption core after 1 to 2 minutes. The test data are as follows:

[0054] Sample name Water absorption speed Reverse osmosis Diffusion area Sample A (no holes) 100％ 100％ 100％ Sample B (0.1 cm) 130％ 105％ 108％ Sample C (0.2 cm) 141％ 123％ 109％ Sample D (0.4 cm) 160％ 132％ 112％

[0055] It can be seen from the above that, on the basis of ensuring the bearing capacity, the larger the width of the outer surface of the holes in the central absorption area is, the stronger its water absorption performance is.

[0056] Comparative Example 2

[0057] This comparative example conducts water absorption tests for different central absorption area heights, and the specific steps are the same as those of comparative example 1. The test data are as follows:

[0058] Sample name Water absorption speed Reverse osmosis Diffusion area Sample A (consistent thickness) 100％ 100％ 100％ Sample B (height difference 40%) 121％ 116％ 104％ Sample C (height difference 50%) 124％ 121％ 107％ Sample D (height difference 60%) 128％ 121％ 110％

[0059] It can be seen from the above that, on the basis of ensuring the comfort of use, the greater the height difference between the central absorption area and the peripheral absorption area, the stronger the water absorption performance.

[0060] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. An absorbent core, characterized in that: The absorbent core comprises a central absorbent region and a peripheral absorbent region, wherein the peripheral absorbent region is arranged around the central absorbent region, wherein the vertical height of the central absorbent region is lower than that of the peripheral absorbent region, and both regions are provided with a plurality of holes in the height direction, wherein the central absorbent region is provided with funnel-shaped holes, and the peripheral absorbent region is provided with regular cone-shaped holes, wherein the holes are evenly distributed and do not penetrate, wherein the holes in the central absorbent region are wide at the top and narrow at the bottom, and the holes in the peripheral absorbent region are narrow at the top and wide at the bottom, wherein the minimum aperture of the funnel-shaped holes and the regular cone-shaped holes is 0.4 mm, and the maximum aperture is 2.5 mm, and the inverted cone and regular cone shapes are formed respectively by gradually changing the diameter, wherein the central absorbent region is 40% to 60% lower in vertical height than the peripheral absorbent region, and the area of ​​the central absorbent region accounts for 20% to 60% of the total area of ​​the absorbent core, and the area of ​​the holes on the surface of the central absorbent region and the peripheral absorbent region is 5 mm 2 ~20mm 2 The outer bottom wall of the central absorption area is provided with a diffusion layer material, which covers the bottom range of the central absorption area and extends to the outer bottom wall of the peripheral absorption area. The central absorption area adopts a composite with cotton and pulp as main components, and the peripheral absorption area adopts high molecular water-absorbent polymer SAP and wood pulp material.

2. An absorbent core according to claim 1, characterized in that: It also includes a bottom film, which is bonded to the four edges of the peripheral absorption area.

3. An absorbent sanitary product, characterized in that: The absorbent core comprises the absorbent core according to any one of claims 1 to 2, and further comprises a surface layer, wherein the surface layer is arranged on the upper side of the absorbent core.

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