Steady-state flow-conducting absorbent core and paper diaper

Abstract

The application discloses a steady-state flow guide absorption core body and a paper diaper. The core body comprises a core body body, which is divided into a liquid absorption area and a plurality of spaced flow guide areas on an extension plane. The liquid absorption area and the flow guide area are sequentially provided with a first wrapping layer, an absorption core layer and a second wrapping layer along the thickness direction. The absorption core layer is configured to be scattered with a high molecular water-absorbing resin in the liquid absorption area, and substantially without the high molecular water-absorbing resin in the flow guide area. Each flow guide area has a plurality of point-shaped junctions on the extension plane. The first wrapping layer and the second wrapping layer are configured to be integrated at the junction area. A flow guide gap is formed between two adjacent junctions, and the flow guide gap is filled with the absorption core layer. The overall shape of the absorption core body is stable, and the phenomenon of fault and lumping is reduced. The flow guide area basically does not hinder the rapid penetration of liquid. After the liquid absorption, the high molecular water-absorbing resin only expands in the liquid absorption area, and the flow guide area is prevented from being cracked and disabled.

Description

Technical Field

[0001] This invention relates to the field of hygiene products, and particularly to absorbent cores and diapers. Background Technology

[0002] The absorbent core is the core component of disposable hygiene products. It uses superabsorbent polymers to efficiently absorb and lock in liquids and is widely used in hygiene products such as diapers, pull-up pants, and sanitary napkins.

[0003] Existing absorbent cores mainly consist of two wrapping layers and an intermediate absorbent core layer. The absorbent core layer is mainly composed of fluff pulp fibers and superabsorbent polymers spread on the fluff pulp fibers. After the superabsorbent polymers absorb liquid and swell, their weight and volume increase, making them prone to falling off and shifting between the fluff pulp fibers. Once shifted, excessive concentration can cause the absorbent core to break or clump, affecting the overall shape of the absorbent core and reducing the user's wearing comfort.

[0004] Based on this, some absorbent cores will have a continuous adhesive zone between the two wrapping layers, which serves to separate and strengthen the absorbent core layer, reducing the occurrence of discontinuity and clumping. However, the continuous adhesive zone will hinder the flow of liquid on the extended surface of the absorbent core, which is not conducive to the rapid flow of liquid. Moreover, after the superabsorbent polymer expands after absorbing liquid, it is easy to tear the adhesive zone, causing the adhesive zone to crack, which will still affect the overall shape of the absorbent core. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a steady-state flow-guiding absorption core, which can stabilize the overall shape of the absorption core and facilitate liquid flow.

[0006] The present invention also proposes a diaper having the above-mentioned steady-state absorbent core.

[0007] According to a first aspect of the present invention, a steady-state flow-guiding absorbent core includes a core body having a thickness direction and an extended surface perpendicular to the thickness direction. The core body is divided into a liquid-absorbing region and a plurality of spaced-apart flow-guiding regions on the extended surface. Both the liquid-absorbing region and the flow-guiding region sequentially include a first coating layer, an absorbent core layer, and a second coating layer along the thickness direction. The absorbent core layer is made of a hydrophilic fiber material and is configured to have superabsorbent polymer (SAP) spread in the liquid-absorbing region, but not substantially disposed of in the flow-guiding region. Each flow-guiding region has a plurality of dotted joints on the extended surface. The first coating layer and the second coating layer are configured to be bonded together in the joint region, and a flow-guiding gap is formed between two adjacent joints, the flow-guiding gap being filled by the absorbent core layer.

[0008] It has at least the following beneficial effects: The absorbent core is divided into a liquid absorption zone and multiple spaced-apart flow guiding zones on its extended surface. First, each flow guiding zone has multiple point-like joints on the extended surface. The first and second wrapping layers are configured to bond together at these joints, forming multiple rigid anchor points that strengthen the support of the absorbent core layer, stabilize the overall shape of the absorbent core, and reduce the occurrence of discontinuities and clumping. Second, flow guiding gaps are formed between adjacent joints, and these gaps are filled by the absorbent core layer. The absorbent core layer is made of hydrophilic fiber material, which has strong hygroscopicity, and this facilitates liquid flow through the flow guiding gaps between the joints, ensuring the flow guiding zones... It will not significantly hinder the rapid penetration of liquid; furthermore, the absorbent core layer is only sprayed with superabsorbent polymer (SAP) in the liquid absorption zone, and there is no SAP in the flow guiding zone. After absorbing liquid, the SAP only expands in the liquid absorption zone and will not directly tear the joints in the flow guiding zone. The indirect impact is minimal, avoiding the failure of the flow guiding zone due to cracking. Moreover, the multiple joints adopt a discontinuous extension structure. Even if a small number of joints on the edge crack due to the expansion stress of the liquid absorption zone, the cracking action of the joints cannot continue due to the isolation effect of the flow guiding gaps, thus avoiding direct impact on the surrounding joints and ensuring the overall support of the flow guiding zone, further stabilizing the overall shape of the absorbent core.

[0009] According to some embodiments of the present invention, the maximum dimension of the flow-guiding gap in the thickness direction is smaller than the dimension of the liquid-absorbing region in the thickness direction, so that the density of the absorbent core layer in the flow-guiding gap is greater than the density in the liquid-absorbing region.

[0010] According to some embodiments of the present invention, the absorbent core layer is made of fluff pulp fiber material.

[0011] According to some embodiments of the present invention, the joint is circular, and a plurality of the joints are evenly distributed in a matrix in the flow guiding area.

[0012] According to some embodiments of the present invention, the outer diameter of the joint is 1-2 mm, and the distance between two adjacent joints on the extension surface is 1-2 mm.

[0013] According to some embodiments of the present invention, both the first wrapping layer and the second wrapping layer are spunbond nonwoven fabrics, and the first wrapping layer and the second wrapping layer are bonded together in the joint area by heat pressing.

[0014] According to some embodiments of the present invention, the extension surface extends along the length direction and the width direction, the core body has a larger dimension in the length direction than in the width direction, the flow guide is divided into a longitudinal flow guide area and a transverse flow guide area, the longitudinal flow guide area extends along the length direction and the width direction and has a larger dimension in the length direction than in the width direction, and the transverse flow guide area extends along the length direction and the width direction and has a smaller dimension in the length direction than in the width direction.

[0015] According to some embodiments of the present invention, a plurality of the transverse guide zones are arranged at equal intervals along the length direction and located at the center position in the width direction, and the longitudinal guide zones are arranged at intervals at both ends of the transverse guide zones along the width direction.

[0016] According to some embodiments of the present invention, the total area of ​​the plurality of guide regions on the extended surface accounts for 9%-16%.

[0017] A diaper according to a second aspect of the present invention includes a diaper body and a steady-state absorbent core according to the first aspect of the present invention, wherein the core body is disposed in the diaper body.

[0018] It has at least the following beneficial effects: This diaper has all the beneficial effects brought about by the absorbent core mentioned above, which will not be repeated here.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of the absorber core in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram after being cut along the AA direction;

[0023] Figure 3 for Figure 1 A magnified view of a section at point B in the middle.

[0024] Reference numerals: Core body 1, First wrapping layer 11, Absorbent core layer 12, Second wrapping layer 13, Liquid absorption zone 2, Flow guiding zone 3, Longitudinal flow guiding zone 3a, Transverse flow guiding zone 3b, Joint 31, Flow guiding gap 32, Superabsorbent polymer 4. Detailed Implementation

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as length, width, thickness, up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] Reference Figures 1 to 3 The present invention discloses a steady-state flow-guiding absorption core, comprising a core body 1, a liquid absorption zone 2 and multiple flow-guiding zones 3.

[0029] The core body 1 has a thickness direction and an extension surface perpendicular to the thickness direction. It can be understood that the core body 1 is generally a thin structure with bendable and foldable extensibility. Depending on the actual use and transportation, the extension surface may be planar or curved. The core body 1 is divided into a liquid absorption zone 2 and multiple spaced-apart flow guiding zones 3 on the extension surface. Both the liquid absorption zone 2 and the flow guiding zone 3 include a first encapsulation layer 11, an absorbent core layer 12, and a second encapsulation layer 13 along the thickness direction. It should be understood that the first encapsulation layer 11 in the liquid absorption zone 2 and the first encapsulation layer 11 in the flow guiding zone 3 are integral structures, as are the second encapsulation layer 13 in the liquid absorption zone 2 and the second encapsulation layer 13 in the flow guiding zone 3. The absorbent core layer 12 in the liquid absorption zone 2 and the absorbent core layer 12 in the flow guiding zone 3 are continuously distributed.

[0030] Reference Figure 1 and Figure 2 The absorbent core layer 12 is made of hydrophilic fiber material, which has strong moisture absorption and can realize the function of liquid diversion. The hydrophilic fiber can be natural fiber or synthetic fiber that has been modified to obtain hydrophilicity. The absorbent core layer 12 is configured such that superabsorbent polymer 4 is spread in the liquid absorption zone 2, while superabsorbent polymer 4 is not actually placed in the diversion zone 3. This makes the liquid absorption zone 2 expand significantly after the core body 1 absorbs liquid, while the diversion zone 3 does not expand significantly and the volume change is small.

[0031] It should be explained that the absorbent core layer 12 does not actually contain superabsorbent polymer 4 in the flow guiding zone 3. This is equivalent to the absorbent core layer 12 not containing superabsorbent polymer 4 in the flow guiding zone 3. Specifically, the absorbent core layer 12 does not specifically contain superabsorbent polymer 4 in the flow guiding zone 3. However, at the microscopic or very small scale, a small amount of superabsorbent polymer 4 may migrate from the liquid absorption zone 2 and mix into the flow guiding zone 3, with negligible impact.

[0032] Reference Figure 2 and Figure 3 Each flow guiding zone 3 has multiple point-like joints 31 on the extended surface. The first wrapping layer 11 and the second wrapping layer 13 are configured to be integrated in the joint 31 area. A flow guiding gap 32 is formed between two adjacent joints 31. The flow guiding gap 32 is filled by the absorbent core layer 12, so that the flow guiding zone 3 can achieve the function of multiple rigid anchor points without affecting the flow guiding function.

[0033] First, each flow-guiding zone 3 of the absorbent core has multiple point-like joints 31 on the extended surface. The first wrapping layer 11 and the second wrapping layer 13 are configured to be integrated in the joint 31 area to form multiple rigid anchor points, which strengthen the support of the absorbent core layer 12, stabilize the overall shape of the absorbent core, and reduce the occurrence of discontinuity and clumping.

[0034] Secondly, a flow guiding gap 32 is formed between two adjacent joints 31. The flow guiding gap 32 is filled by the absorbent core layer 12. The absorbent core layer 12 is made of hydrophilic fiber material, which has strong moisture absorption and makes the flow guiding gap 32 between the joints 31 conducive to liquid flow, ensuring that the flow guiding area 3 will not hinder the rapid penetration of liquid.

[0035] Furthermore, the absorbent core layer 12 only has superabsorbent polymer 4 spread in the liquid absorption zone 2, and no superabsorbent polymer 4 is actually placed in the flow guiding zone 3. After absorbing liquid, the superabsorbent polymer 4 only expands in the liquid absorption zone 2 and will not directly tear the joints in the flow guiding zone 3. The indirect impact is minimal, thus avoiding the failure of the flow guiding zone 3 to crack. Moreover, the multiple joints 31 adopt a discontinuous extension structure. Even if a small number of joints 31 on the edge crack due to the expansion stress of the liquid absorption zone 2, the cracking action of the joints 31 cannot continue due to the isolation effect of the flow guiding gap 32, thus avoiding direct impact on the surrounding joints 31, ensuring the overall support of the flow guiding zone 3, and further stabilizing the overall shape of the absorbent core.

[0036] In some embodiments of the present invention, reference is made to... Figure 2In the thickness direction, the guiding zone 3 is compressed more tightly than the liquid absorption zone 2, ensuring that the maximum size of the guiding gap 32 in the thickness direction is smaller than that of the liquid absorption zone 2 in the thickness direction. This makes the density of the absorbent core layer 12 in the guiding gap 32 greater than that in the liquid absorption zone 2. In other words, the density of hydrophilic fibers in the guiding gap 32 is greater than that in the liquid absorption zone 2. To a certain extent, this can prevent the superabsorbent polymer 4 in the liquid absorption zone 2 from shifting and mixing into the hydrophilic fibers in the guiding gap 32 before or after liquid absorption. Moreover, after liquid absorption, the flow rate of liquid between the hydrophilic fibers in the guiding gap 32 is faster than that between the hydrophilic fibers in the liquid absorption zone 2, allowing the liquid in the guiding zone 3 to be quickly guided into the liquid absorption zone 2, avoiding liquid stagnation in the guiding zone 3 and leakage.

[0037] In some embodiments of the present invention, the absorbent core layer 12 is made of fluff pulp fiber material. Specifically, the fluff pulp fiber can be a flat fiber made of softwood pulp raw material, which has the characteristics of fast liquid absorption speed and contains a cavity structure to achieve rapid flow.

[0038] In some embodiments, refer to Figure 1 and Figure 3 The joint 31 is circular, and multiple joints 31 are evenly distributed in a matrix in the guide area 3, ensuring that the guide area 3 itself has sufficient support strength and guide effect, and can radiate and support the surrounding liquid absorption area 2 on the extended surface, as shown in the figure. Figure 2 Each joint 31 is surrounded by an absorbent core layer 12 on its extended surface, so that the liquid on the outer surface of the joint 31 can be quickly absorbed by the absorbent core layer 12 and guided to the surrounding area.

[0039] The outer diameter of the joint 31 can be configured to be 1-2 mm, and the distance between two adjacent joints 31 on the extension surface can be configured to be 1-2 mm. The outer diameter of the superabsorbent polymer 4 before liquid absorption is generally 0.1-0.8 mm. Among them, the outer diameter of most superabsorbent polymer 4 before liquid absorption is concentrated in the range of 0.3-0.5 mm. After liquid absorption, the outer diameter can expand several times or even tens of times. Therefore, the reasonable distance between two adjacent joints 31 can effectively prevent the superabsorbent polymer 4 after liquid absorption from entering the guide gap 32, so as to prevent the superabsorbent polymer 4 from cracking the guide area 3 when it further absorbs liquid and continues to expand.

[0040] In some embodiments, refer to Figure 2 The first wrapping layer 11 and the second wrapping layer 13 are both spunbond nonwoven fabrics, and the first wrapping layer 11 and the second wrapping layer 13 are bonded together by heat pressing in the joint area 31.

[0041] During the production process, the absorbent core layer 12 can be filled into the flow guide area 3 first, and then the first wrapping layer 11 and the second wrapping layer 13 can be hot-pressed together in the joint area 31. The first wrapping layer 11 and the second wrapping layer 13 are spunbond nonwoven fabrics, and the absorbent core layer 12 is fluff pulp fiber. Taking high-temperature hot pressing with multiple needle-shaped hot pressing heads as an example, the needle-shaped hot pressing heads press down to contact one of the spunbond nonwoven fabrics and gradually squeeze the fluff pulp fiber outwards until the two spunbond nonwoven fabrics come into contact and are hot-melted together. Even if a small amount of fluff pulp fiber is sandwiched between the two spunbond nonwoven fabrics and is hot-melted together, it will not affect the support strength of the joint 31.

[0042] In some embodiments, refer to Figure 1 The extension surface extends along the length and width directions. The core body 1 has a larger dimension in the length direction than in the width direction. The flow guiding area 3 is divided into a longitudinal flow guiding area 3a and a transverse flow guiding area 3b. The longitudinal flow guiding area 3a extends along the length and width directions and has a larger dimension in the length direction than in the width direction. The transverse flow guiding area 3b extends along the length and width directions and has a smaller dimension in the length direction than in the width direction. Multiple longitudinal flow guiding areas 3a and multiple transverse flow guiding areas 3b are distributed alternately on the core body 1 to ensure the support strength of the core body 1 in the length and width directions and to stably absorb the overall shape of the core from multiple directions.

[0043] Multiple transverse guide zones 3b can be arranged at equal intervals along the length direction and located in the center of the width direction. Longitudinal guide zones 3a are arranged at both ends of the transverse guide zones 3b along the width direction, forming multiple sets of internally unconnected "H"-shaped structures. Specifically, three sets of "H"-shaped structures can be set, distributed in the front, lower, and rear areas of the core body 1 when worn. The total area ratio of the multiple guide zones 3 on the extended surface can be configured to 9%-16%, ensuring sufficient support strength without excessively encroaching on the coverage area of ​​the absorbent area 2.

[0044] Reference Figures 1 to 3 The present invention also discloses a diaper, including a diaper body and an absorbent core as described in the above embodiments. The core body 1 is disposed in the diaper body. The diaper has all the beneficial effects brought about by the absorbent core, which will not be repeated here.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A steady-state current-guiding and absorbing core, comprising a core body, the core body having a thickness direction and an extension surface perpendicular to the thickness direction, characterized in that, The core body is divided into a liquid absorption area and a plurality of spaced-apart flow guiding areas on the extended surface. The liquid absorption area and the flow guiding area each include a first wrapping layer, an absorbent core layer and a second wrapping layer in sequence along the thickness direction. The absorbent core layer is made of hydrophilic fiber material, and the absorbent core layer is configured such that superabsorbent polymer is spread in the liquid absorption area, and the superabsorbent polymer is not substantially disposed in the flow guiding area. Each of the flow guiding regions has multiple point-like joints on the extended surface. The first wrapping layer and the second wrapping layer are bonded together in the joint area by hot pressing. A flow guiding gap is formed between two adjacent joints. The flow guiding gap is filled by the absorbent core layer. The maximum size of the flow guiding gap in the thickness direction is smaller than the size of the liquid absorption region in the thickness direction, so that the density of the absorbent core layer in the flow guiding gap is greater than the density in the liquid absorption region. The flow guiding area is divided into a longitudinal flow guiding area and a transverse flow guiding area. The longitudinal flow guiding area extends along the length and width directions, and its dimension in the length direction is larger than its dimension in the width direction. The transverse flow guiding area extends along the length and width directions, and its dimension in the length direction is smaller than its dimension in the width direction. A plurality of transverse flow guiding areas are arranged at equal intervals along the length direction and are located at the center position in the width direction. The longitudinal flow guiding areas are arranged at both ends of the transverse flow guiding areas along the width direction. The total area of ​​the plurality of flow guiding areas on the extended surface accounts for 9%-16%.

2. The steady-state current-guiding and absorption core according to claim 1, characterized in that, The absorbent core layer is made of fluff pulp fiber material.

3. The steady-state current-guiding and absorption core according to claim 1, characterized in that, The joint is circular, and multiple joints are evenly distributed in a matrix in the flow guiding area.

4. The steady-state current-guiding and absorption core according to claim 3, characterized in that, The outer diameter of the joint is 1-2 mm, and the distance between two adjacent joints on the extension surface is 1-2 mm.

5. The steady-state current-guiding and absorption core according to claim 1, 3, or 4, characterized in that, Both the first wrapping layer and the second wrapping layer are spunbond nonwoven fabrics.

6. The steady-state current-guiding and absorption core according to claim 1, characterized in that, The extension surface extends along the length and width directions, and the core body has a larger dimension in the length direction than in the width direction.

7. A diaper, characterized in that, It includes a pant body and a steady-state flow-guiding and absorption core as described in any one of claims 1 to 6, wherein the core body is disposed within the pant body.

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