A core structure with high absorption and high diffusion and an absorbent article using the core structure

Abstract

The present invention relates to a core structure with high absorption and high diffusion, including a composite absorption core. The structural feature is that the composite absorption core includes an outer composite absorption core and an inner composite absorption core circumferentially enclosed by the outer composite absorption core. A ring-shaped liquid diffusion and diversion area is provided between the outer composite absorption core and the inner composite absorption core. One side of the ring-shaped liquid diffusion and diversion area circumferentially surrounds the inner composite absorption core along the outer side of the inner composite absorption core, while the other side circumferentially surrounds the outer composite absorption core along the inner side of the outer composite absorption core, and is respectively sleeved and connected to the outer composite absorption core and the inner composite absorption core in a laterally separable manner to form an integral body. A ring-shaped diversion groove formed by inward depression along the thickness direction is provided in the ring-shaped liquid diffusion and diversion area, and a ring-shaped notch is provided circumferentially along the outer edge and / or inner edge of the ring-shaped liquid diffusion and diversion area.

Description

Technical Field

[0001] The present invention relates to the technical field of disposable liquid-absorbing articles, and particularly relates to a core structure with high absorption and high diffusion and an absorbent article using the core structure. Technical Background

[0002] Generally speaking, absorbent articles include baby diapers, diaper pads, pull-ups, etc., all of which are composed of multiple layers of materials. However, since the traditional absorbent core is relatively thick and prone to lumping and delamination after long-term use, it is easy to squeeze the crotch of infants and young children, bringing inconvenience to the activities of infants and young children and also posing a threat to their health. In order to make absorbent articles more comfortable to wear, lighter, thinner and more comfortable absorbent articles have emerged.

[0003] Existing ultra-thin absorbent articles all adopt composite absorbent cores. The existing composite absorbent core generally has a five-layer structure. For example, the composite absorbent core includes a first covering layer, a first superabsorbent resin layer, a fluffy non-woven fabric layer, a second superabsorbent resin layer, and a second covering layer from top to bottom, and is thermally bonded into one body. In addition, the existing composite absorbent core can also adopt a structure with more than five layers, such as a seven-layer structure. The composite absorbent core includes a first covering layer, a first superabsorbent resin layer, a first fluffy non-woven fabric layer, a second superabsorbent resin layer, a second covering layer, a third superabsorbent resin layer, a second fluffy non-woven fabric layer, and a fourth superabsorbent resin layer from top to bottom, and is thermally bonded into one body.

[0004] However, due to the large content and high distribution density of the superabsorbent resin in the existing composite absorbent core, problems such as penetration and side leakage occur due to colloid blockage after it absorbs liquid. On the other hand, after the superabsorbent resin in the composite absorbent core absorbs liquid and swells, the first covering layer and the second covering layer limit the free expansion space of the superabsorbent resin colloid, inhibiting the liquid absorption capacity of the composite absorbent core, so that the actual liquid absorption capacity of the existing composite absorbent core only reaches 50%-60% of its own saturated liquid absorption capacity, or even lower, resulting in a huge household consumption burden and resource waste caused by the low utilization rate of absorbent articles.

[0005] To improve the problems existing in the prior art, those skilled in the art adopt a special absorbent core to overcome such technical problems. For example, the invention patent with the application number 2017103692328 discloses a highly absorbent and highly diffusible absorbent article, which includes a liquid-permeable surface layer, a liquid-impermeable bottom layer, and an absorbent layer. The absorbent layer includes an absorbent core, and the absorbent core includes at least one liquid longitudinal diffusion and diversion area along its longitudinal direction and an absorbent body area surrounding the liquid longitudinal diffusion and diversion area. Its structural feature is that a liquid-permeable surface layer with elasticity is provided above the absorbent layer, and a diversion groove extending along the direction of the liquid longitudinal diffusion and diversion area is provided on the elastic liquid-permeable surface layer corresponding to the liquid longitudinal diffusion and diversion area. The diversion groove penetrates the liquid longitudinal diffusion and diversion area downward from the elastic liquid-permeable surface layer along the thickness direction of the absorbent article. In the diversion groove, the fluffy fiber network in the liquid longitudinal diffusion and diversion area is integrally connected with the elastic liquid-permeable surface layer by thermal pressing, and the width and length of the diversion groove are respectively smaller than the transverse width and longitudinal length of the liquid longitudinal diffusion and diversion area. Summary of the Invention

[0006] In order to overcome the problems that the existing absorbent core is prone to form colloid blockage after absorbing liquid, resulting in slow penetration, side leakage, and diffusion absorption rate, and the technical problem that after the superabsorbent resin in the absorbent core absorbs liquid and swells, due to insufficient free expansion space, the liquid absorption capacity of the absorbent core is inhibited, the present invention provides a core structure with high absorption and high diffusion, and is realized through the following technical solutions:

[0007] The core structure with high absorption and high diffusion includes an absorbent core, and its structural feature is that the absorbent core includes an outer absorbent core and an inner absorbent core circumferentially enclosed by the outer absorbent core. A circular liquid diffusion and diversion area is provided between the outer absorbent core and the inner absorbent core. One side of the circular liquid diffusion and diversion area circumferentially surrounds the inner absorbent core along the outer side of the inner absorbent core, and the other side circumferentially surrounds the outer absorbent core along the inner side of the outer absorbent core, and is respectively laterally connected to the outer absorbent core and the inner absorbent core as a whole.

[0008] Preferably, a diversion groove formed by inward depression along its thickness direction is provided in the circular liquid diffusion and diversion area. The diversion groove circumferentially surrounds between the inner side of the outer absorbent core and the outer side of the inner absorbent core to form a circular diversion groove. Further, the diversion groove is preferably a diversion press groove formed by thermal pressing, and the circular diversion groove is preferably a circular diversion press groove formed by thermal pressing.

[0009] Preferably, the absorbent core is a composite absorbent core or a hybrid absorbent core. Among them, the composite absorbent core includes at least a first covering layer, a first superabsorbent resin layer, a fluffy non-woven fabric layer, a second superabsorbent resin layer, and a second covering layer from top to bottom.

[0010] Preferably, the absorbent core is a composite absorbent core, and the annular liquid diffusion and diversion area includes a first covering layer, a fluffy fiber mesh layer, and a second covering layer, and a top annular diversion groove is formed by pressing the covering surface layer from top to bottom through an upper cam / lower flat roller, or / and a bottom annular diversion groove is formed by pressing the covering bottom layer from top to bottom through an upper pressure roller / lower cam.

[0011] Preferably, the lateral connection is a detachable connection.

[0012] Preferably, the separable connection is a sleeve connection, which includes an annular cut circumferentially arranged along the outer edge and / or inner edge of the annular liquid diffusion and diversion area, and the annular cut enables the liquid diffusion and diversion area to be embedded in the inner edge of the outer absorbent core, or / and the outer edge of the inner absorbent core, so that the annular liquid diffusion and diversion area is separable from the outer absorbent core and / or the inner absorbent core.

[0013] Preferably, the depth of the annular cut is from the first covering layer of the composite absorbent core through the fluffy fiber web layer to the second covering layer, or through the second covering layer to form a connected annular cut.

[0014] Preferably, the cross-sectional shape of the guide groove includes an inverted trapezoid, a square, a rectangle, a V-shape or an arc.

[0015] Preferably, the depth of the guide groove is 20%-80% of the thickness of the annular liquid diffusion guide area, and the width is 5-35 mm.

[0016] Based on the technical solution of the aforementioned high-absorption and high-diffusion core structure, the present invention further provides an absorbent product, comprising a liquid-permeable surface layer, a liquid-impermeable bottom layer, and an absorbent layer located between the liquid-permeable surface layer and the liquid-impermeable bottom layer, and its structural feature is that the high-absorption and high-diffusion core structure described in the present invention is arranged in the absorbent layer.

[0017] The beneficial effects achieved by the present invention are as follows: on the one hand, the present invention can make the liquid diffuse rapidly along the annular guide groove to the absorbent core in an all-round and all-angle manner of 360°, greatly improving the diffusion speed and absorption rate of the absorbent core to the liquid, improving the absorption capacity and utilization rate of the absorbent core, and effectively reducing the problems of infiltration and side leakage caused by colloid blockage of the absorbent core in the prior art; on the other hand, the annular cut of the present invention gives the inner absorbent core or / and the outer absorbent core a free expansion space when absorbing liquid. When the highly absorbent resin in the inner absorbent core or / and the outer absorbent core absorbs liquid and expands, the annular cut can provide it with sufficient free expansion space, greatly improving the liquid absorption capacity of the absorbent core, and solving the technical problem of limiting the subsequent absorption of liquid by the existing absorbent core after it expands after absorbing liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a composite core structure with high absorption and high diffusion.

[0019] Figure 2 It is a schematic diagram of Figure 1 the structure taken along the A-A cross-section.

[0020] Figure 3 It is a schematic structural diagram of an outer composite absorption core.

[0021] Figure 4 It is a schematic structural diagram of an annular diversion groove structure arranged circumferentially around the inner composite absorption core.

[0022] Figure 5 It is a schematic diagram of Figure 4 the structure taken along the B-B cross-section.

[0023] Figure 6 It is a schematic structural diagram of an absorbent article provided with a composite core structure with high absorption and high diffusion. Detailed implementation manners

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Embodiment 1

[0026] This embodiment provides a composite core structure with high absorption and high diffusion to solve the problems that the existing composite absorption core is prone to form colloid blockage after liquid absorption, resulting in penetration and side leakage. The composite core structure includes a composite absorption core, and the composite absorption core at least includes a first covering layer, a first superabsorbent resin layer, a fluffy non-woven fabric layer (i.e., a hot-melt fiber network structure layer), a second superabsorbent resin layer, and a second covering layer from top to bottom.

[0027] As shown in the attached Figure 1 , 2 figures, the structural features of this embodiment are as follows: The composite absorption core is composed of an outer composite absorption core 1 and an inner composite absorption core 2 circumferentially enclosed by the outer composite absorption core. An annular liquid diffusion diversion area 3 is arranged between the outer composite absorption core 1 and the inner composite absorption core 2, and an annular diversion groove 31 is arranged in the annular liquid diffusion diversion area 3, and the annular diversion groove 31 plays a role in diffusing and diverting liquid.

[0028] As a specific implementation manner of this embodiment, one side of the annular liquid diffusion and diversion area 3 circumferentially surrounds the inner composite absorbent core 2 along the outer side of the inner composite absorbent core 2, and the other side circumferentially surrounds the outer composite absorbent core 1 along the inner side of the outer composite absorbent core 1, and is laterally connected to the outer composite absorbent core 1 and the inner composite absorbent core 2 respectively to form an integral body.

[0029] The annular diversion groove 31 of this embodiment is implemented in the following manner:

[0030] First, the fluffy non-woven fabric layer is a fluffy fiber network connected together by interpenetrating and winding of highly crimped hot-melt fibers. The fluffy non-woven fabric layer serves to fix the superabsorbent resin and enhance the strength of the absorbent core; and the annular liquid diffusion and diversion area includes a covering surface layer, a fluffy fiber mesh layer, and a covering bottom layer.

[0031] In the specific implementation manner, the fluffy fiber mesh layer and the fluffy non-woven fabric layer of this example are formed by integral molding, that is, both are formed by interpenetrating and winding, laying the web, and heat setting with highly crimped hot-melt fibers. Similarly, the covering surface layer and the first covering layer, and the covering bottom layer and the second covering layer are all materials formed by integral molding respectively.

[0032] Secondly, when applying the superabsorbent resin, granular superabsorbent resin is not applied in the fluffy fiber mesh layer, that is, the superabsorbent resin is not applied in the area corresponding to the liquid diffusion and diversion area (however, in other implementation manners, a small amount of superabsorbent resin may be contained in the fluffy fiber mesh layer). At the same time, a first superabsorbent resin layer and a second superabsorbent resin layer are respectively applied to the inner composite absorbent core and the outer composite absorbent core, and the superabsorbent resin particles in the first superabsorbent resin layer and the second superabsorbent resin layer are respectively embedded in the fiber grids in the fluffy non-woven fabric layer.

[0033] Then, a flat pressing roller / cam combination process is used to press the liquid diffusion and diversion area up and down to form an annular diversion groove (that is, the annular diversion groove), specifically including:

[0034] One, in some implementation manners, a top pressing roller / bottom cam combination process is used to press the liquid diffusion and diversion area up and down, and then a bottom annular diversion groove (that is, the bottom annular diversion groove) is formed at the bottom of the liquid diffusion and diversion area. Specifically, the liquid diffusion and diversion area includes a covering surface layer, a fluffy fiber mesh layer, and a covering bottom layer, and the bottom annular diversion groove formed by the top pressing roller / bottom cam through up and down pressing from the covering bottom layer.

[0035] Second, in some other embodiments, an upper cam / lower pressing roller combination process is adopted to press the liquid diffusion and diversion area up and down to form a top annular diversion groove (i.e., the top annular diversion groove) at the top of the liquid diffusion and diversion area. Specifically, the liquid diffusion and diversion area includes a covering surface layer, a fluffy fiber web layer, and a covering bottom layer, and the top annular diversion groove is formed by the upper cam / lower pressing roller from the covering surface layer through up and down pressing.

[0036] After the above-mentioned implementation process, an annular diversion groove (annular diversion groove) that is recessed inward along the thickness direction is provided in the annular liquid diffusion and diversion area, and the annular diversion groove circumferentially surrounds between the inner side of the outer composite absorbent core and the outer side of the inner composite absorbent core.

[0037] As a preference of this embodiment, the cross-sectional shape of the annular diversion groove 31 can be an inverted trapezoid, a square, a rectangle, a V shape or an arc shape, or other cross-sectional shapes can also be adopted. The depth is 20%-80% of the thickness of the annular liquid diffusion and diversion area, and the width is 5-35 mm.

[0038] The beneficial technical effect of this embodiment is that the high-absorbency and high-diffusion composite core structure formed in this embodiment can enable the liquid to quickly diffuse 360° in all directions and at all angles along the annular diversion groove to the composite absorbent core, greatly improving the diffusion speed and absorption rate of the composite absorbent core for the liquid, improving the absorption capacity and utilization rate of the composite absorbent core, and reducing the problems of penetration and side leakage of the composite absorbent core caused by colloid blockage in the prior art.

[0039] Embodiment 2

[0040] There is a technical problem in the existing composite absorbent core that after the superabsorbent resin absorbs the liquid and swells, the swelling space is insufficient due to the limitation of the first covering layer and the second covering layer on the free swelling space, thus inhibiting the liquid absorption capacity of the composite absorbent core.

[0041] To solve the above technical problems in this embodiment, as shown in the attached Figure 3 , 4 figures, on the basis of Embodiment 1, an implementation manner of a high-absorbency and high-diffusion composite core structure is further provided, which is specifically as follows:

[0042] A circular notch 5 is circumferentially provided along the outer edge and / or inner edge of the annular liquid diffusion and diversion area 3. The circular notch 5 enables the liquid diffusion and diversion area 3 to be sleeved and connected with the outer composite absorbent core 1 and the inner composite absorbent core 2 respectively. The specific implementation methods are as follows: Only a circular notch 5 is provided along the outer edge of the annular liquid diffusion and diversion area, and then the outer edge of the annular liquid diffusion and diversion area is inserted into the inner edge 4 of the outer composite absorbent core for sleeved connection. The above sleeved connection enables the annular liquid diffusion and diversion area 3 and the outer composite absorbent core 1 to be separable from each other, giving the outer composite absorbent core an expansion space for the superabsorbent resin inside.

[0043] However, in other implementation methods, the following several types can also be included:

[0044] First, only a circular notch is provided along the inner edge of the annular liquid diffusion and diversion area, and then the inner edge of the annular liquid diffusion and diversion area is inserted into the outer edge of the inner composite absorbent core for sleeved connection.

[0045] Second, circular notches are provided along the outer edge and inner edge of the annular liquid diffusion and diversion area at the same time, and then the outer edge and inner edge of the annular liquid diffusion and diversion area are respectively inserted into the inner edge of the outer composite absorbent core and the outer edge of the inner composite absorbent core for sleeved connection.

[0046] The above sleeved connection enables the annular liquid diffusion and diversion area to be separable from the outer composite absorbent core and / or the inner composite absorbent core, giving the outer composite absorbent core and / or the inner composite absorbent core an expansion space for the superabsorbent resin inside.

[0047] In the specific implementation method, the circular notch is implemented through the following process:

[0048] First, infrared rays or the like are used to position the annular liquid diffusion and diversion area;

[0049] Second, a roller provided with a circular cutting knife is used to perform positioning and cutting along the outer edge and / or inner edge of the annular liquid diffusion and diversion area to form a circular notch. Among them:

[0050] In some implementation methods, the depth of the circular notch penetrates from the covering surface layer (i.e., the first covering layer) through the fluffy fiber web layer to the covering bottom layer (i.e., the second covering layer). However, in other implementation methods, the depth of the circular notch penetrates through the covering bottom layer from the covering surface layer to form a connected circular notch.

[0051] The beneficial technical effects of this embodiment are as follows. The annular notch formed in this embodiment endows the inner composite absorbent core or / and the outer composite absorbent core with free expansion space during liquid absorption. When the superabsorbent resin in the inner composite absorbent core or / and the outer composite absorbent core absorbs liquid and expands, the annular notch can provide sufficient expansion space for it, greatly improving the liquid absorption capacity of the composite absorbent core and solving the technical problem that the existing composite absorbent core is restricted from further absorbing liquid after absorbing liquid and expanding.

[0052] Embodiment 3

[0053] The core structure of this embodiment is a mixed absorbent core formed by blending superabsorbent resin and fluff pulp fibers. In this mixed absorbent core, there is provided the annular liquid diffusion and diversion area of Embodiment 1, or an annular notch as in Embodiment 2 is implemented on the basis of the annular liquid diffusion and diversion area.

[0054] Specifically, the mixed absorbent core is composed of an outer mixed absorbent core and an inner mixed absorbent core circumferentially enclosed by the outer mixed absorbent core. An annular liquid diffusion and diversion area is formed between the outer mixed absorbent core and the inner mixed absorbent core, and then an annular diversion groove is provided in the annular liquid diffusion and diversion area, and this annular diversion groove plays a role in diffusing and diverting liquid.

[0055] An annular notch is further circumferentially provided along the outer edge or / and the inner edge of the annular liquid diffusion and diversion area. The annular notch enables the liquid diffusion and diversion area to be sleeved and connected to the outer mixed absorbent core and the inner mixed absorbent core respectively.

[0056] Embodiment 4

[0057] As shown in the attached Figure 6 figure, this embodiment provides an absorbent article 10, which includes a liquid-permeable top sheet, a liquid-impermeable bottom sheet, and an absorbent layer located between the liquid-permeable top sheet and the liquid-impermeable bottom sheet. Its structural feature is that a composite core structure with high absorption and high diffusion of Embodiment 1 or Embodiment 2 is provided in the absorbent layer. Specifically:

[0058] As one implementation manner, the composite absorbent core is composed of an outer composite absorbent core 1 and an inner composite absorbent core 2 circumferentially enclosed by the outer composite absorbent core. An annular liquid diffusion and diversion area 3 is formed between the outer composite absorbent core 1 and the inner composite absorbent core 2, and then an annular diversion groove is provided in the annular liquid diffusion and diversion area 3, and this annular diversion groove plays a role in diffusing and diverting liquid.

[0059] As another implementation manner, an annular notch (not shown in the figure) is circumferentially provided along the outer edge or / and the inner edge of the annular liquid diffusion and diversion area 3. The annular notch enables the liquid diffusion and diversion area 3 to be sleeved and connected to the outer composite absorbent core 1 and the inner composite absorbent core 2 respectively.

[0060] Performance Test

[0061] (1) Test Method:

[0062] 1. The test method for the penetration and diffusion performance of the absorbent article to physiological saline is as follows:

[0063] Step 1: Take 3 pieces of filter paper with a diameter of 11 cm, weigh them respectively and record as M 01 、M 02 、M 03 , for later use.

[0064] Step 2: Prepare physiological saline (artificial urine can also be used) as the test liquid, measure 100 ml of the liquid in three portions with a measuring cylinder, for later use;

[0065] Step 3: Straighten and flatten the absorbent article sample to be tested and lay it on the test board, and mark the center point of the absorbent article according to its length and width;

[0066] Step 4: Place the test support above the absorbent article sample to be tested, so that the opening of the test funnel is directly above the center point and aligned with the center point;

[0067] Step 5: Pour 100 ml of physiological saline into the test funnel, turn on the liquid addition switch, and let the liquid penetrate into the absorbent article sample to be tested. At the same time, start timing with a stopwatch. When the physiological saline completely penetrates the absorbent article sample, that is, when the liquid on the liquid-permeable top layer disappears, stop timing and record the first penetration time T1;

[0068] Step 6: After 10 minutes, repeat step (5) and record the second penetration time T2;

[0069] Step 7: After 10 minutes, repeat step (5) and record the third penetration time T3;

[0070] Step 8: After 5 minutes from the completion of step (7), place the filter papers marked as M 01 、M 02 、M 03 at the front, middle and rear positions of the absorbent article respectively, place a 3 kg weight on each filter paper, and start timing;

[0071] Step 9: After 5 minutes of timing in step (8), remove the weights, and weigh M 01 、M 02 、M 03 respectively, and mark them as M 11 、M 12 、M 13 ; At the same time, measure the maximum longitudinal diffusion length and the minimum longitudinal diffusion length of the liquid.

[0072] Step 10: Calculate the liquid re-seepage amount M: M = (M 11 -M 01 )+(M 12 -M 02 )+(M 13 -M 03 )

[0073] 2. Saturated liquid absorption capacity test:

[0074] Step 1. Prepare 50L of normal saline.

[0075] Step 2: Weigh the absorbent product and the comparison sample, and record their respective weights as M0.

[0076] Step 3: completely immerse the absorbent product and the control sample in physiological saline and start timing.

[0077] Step 4: After the timer reaches 30 minutes, take out the absorbent product and the control sample and place them in a drain rack to drain for 10 minutes.

[0078] Step 5: Weigh them separately and record them as M1.

[0079] Step 5: Calculate the saturated water absorption rate.

[0080] (II) Test samples:

[0081] The high-absorption and high-diffusion composite core structure prepared in Examples 1-2 was made into an L-shaped absorbent product trial product (containing 10g of super absorbent resin) according to the structure of the absorbent product in Example 3; a commercially available ordinary absorbent product using a composite absorbent core was used as a comparison sample (tested to contain 10.2g of super absorbent resin).

[0082] (III) The test results are as follows:

[0083]

[0084] The above test results show that the present invention can effectively improve the diffusion length and absorption rate of liquid by absorbent products, improve the absorption capacity of the composite absorbent core and the utilization rate of the composite absorbent core; the annular cut of the present invention can provide sufficient free expansion space for the absorbent product when absorbing liquid, greatly improve the liquid absorption rate of the absorbent product, and solve the technical problem of limiting the subsequent absorption of liquid by the existing composite absorbent core after swelling after absorbing liquid.

[0085] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the forms disclosed herein, should not be construed as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the above teachings or the skills or knowledge in related fields. Any alterations and changes made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A core structure with high absorption and high diffusion, comprising an absorption core, wherein the absorption core includes an outer absorption core and an inner absorption core circumferentially enclosed by the outer absorption core. Both the inner absorption core and the outer absorption core include a first covering layer, a first superabsorbent resin layer, a fluffy non-woven fabric layer, a second superabsorbent resin layer, and a second covering layer from top to bottom. The superabsorbent resin particles in the first superabsorbent resin layer and the second superabsorbent resin layer are respectively embedded in the fiber grids in the fluffy non-woven fabric layer, and it is characterized in that: A ring-shaped liquid diffusion and diversion area is also provided between the outer absorbent core and the inner absorbent core. The ring-shaped liquid diffusion and diversion area includes a covering surface layer, a fluffy fiber web layer, and a covering bottom layer, and granular superabsorbent resin is not applied in the fluffy fiber web layer; One side of the ring-shaped liquid diffusion and diversion area circumferentially surrounds the inner absorbent core along the outer circumference of the inner absorbent core, and the other side circumferentially surrounds the outer absorbent core along the inner circumference of the outer absorbent core and is laterally connected to the outer absorbent core and the inner absorbent core respectively to form a whole; The lateral connection is a separable connection. The separable connection is a nested connection. The nested connection includes annular cut marks circumferentially arranged along the outer edge and the inner edge of the ring-shaped liquid diffusion and diversion area respectively. The annular cut marks make the ring-shaped liquid diffusion and diversion area fit between the inner edge of the outer absorbent core and the outer edge of the inner absorbent core, so that the ring-shaped liquid diffusion and diversion area can be separated from both the outer absorbent core and the inner absorbent core. Among them, the depth of the annular cut mark is from the first covering layer of the composite absorbent core through the fluffy fiber web layer to the second covering layer, or through the second covering layer to form a connected annular cut mark; Among them, the annular cut mark is implemented through the following steps: First, use infrared to position the ring-shaped liquid diffusion and diversion area; Secondly, use a roller provided with an annular cutter to perform positioning cutting along the outer edge and the inner edge of the ring-shaped liquid diffusion and diversion area to form an annular cut mark.

2. The core structure with high absorption and high diffusion according to claim 1, characterized in that: A diversion groove recessed inward along the thickness direction is provided in the ring-shaped liquid diffusion and diversion area. The diversion groove circumferentially surrounds between the inner side of the outer absorbent core and the outer side of the inner absorbent core to form an annular diversion groove.

3. The core structure with high absorption and high diffusion according to claim 2, characterized in that: The absorbent core is a composite absorbent core. The ring-shaped liquid diffusion and diversion area includes a first covering layer, a fluffy fiber web layer, and a second covering layer. The top annular diversion groove is formed by upper and lower pressing from the covering surface layer through an upper cam / lower flat pressing roller; or / and the bottom annular diversion groove is formed by upper and lower pressing from the covering bottom layer through an upper flat pressing roller / lower cam.

4. The core structure with high absorption and high diffusion according to claim 2, characterized in that: The absorbent core is a hybrid absorbent core, and the ring-shaped liquid diffusion and diversion area composed of a top annular diversion groove or / and a bottom annular diversion groove is provided on the hybrid absorbent core.

5. The core structure with high absorption and high diffusion according to any one of claims 2 - 4, characterized in that: The cross-sectional shape of the diversion groove includes an inverted trapezoid, a square, a rectangle, a V shape, or an arc.

6. The core structure with high absorption and high diffusion according to any one of claims 2 - 4, characterized in that: The depth of the diversion groove is 20%-80% of the thickness of the ring-shaped liquid diffusion and diversion area, and the width is 5-35 mm.

7. An absorbent article, comprising a liquid-permeable top sheet, a liquid-impermeable bottom sheet, and an absorbent layer located between the liquid-permeable top sheet and the liquid-impermeable bottom sheet, and it is characterized in that: The absorbent layer is provided with a core structure with high absorption and high diffusion as described in any one of claims 1-6.

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