A type of high-diffusivity baby diaper

Abstract

This utility model relates to the field of disposable hygiene products, and more particularly to a high-diffusion baby diaper with good diversion effect and high absorption efficiency. The absorbent core layer includes a top non-woven fabric, a middle non-woven fabric, a bulky non-woven fabric, a bottom non-woven fabric, a wood pulp fiber layer, a first absorbent material layer, and a second absorbent material layer. The first absorbent material layer includes first superabsorbent polymer particles and first wood pulp fibers. The second absorbent material layer includes second superabsorbent polymer particles. The second absorbent material layer is disposed between the bulky non-woven fabric and the bottom non-woven fabric, and some of the second superabsorbent polymer particles on the second absorbent material layer are embedded in the pores of the bulky non-woven fabric. The first absorbent material layer is disposed between the bulky non-woven fabric and the middle non-woven fabric, and some of the first superabsorbent polymer particles on the first absorbent material layer are embedded in the pores of the bulky non-woven fabric.

Description

Technical Field

[0001] This utility model relates to the field of disposable hygiene products, and in particular to a high-diffusion baby diaper. Background Technology

[0002] The structure of a diaper is generally as follows: from top to bottom, it includes a liquid-permeable top layer, an absorbent core layer, and a liquid-impermeable bottom layer. The absorbent core layer is usually made of a mixture of superabsorbent polymer particles and wood pulp fibers, wrapped with non-woven fabric to form a block structure, which is used to absorb and retain human excrement. The liquid-permeable top layer is composed of hydrophilic non-woven fabric and hydrophobic non-woven fabric fixed on both sides of the hydrophilic non-woven fabric. It is used to provide a comfortable and dry feeling when in contact with the body, while allowing liquid to pass freely into the lower absorbent core layer. The liquid-impermeable bottom layer is composed of a breathable and water-impermeable film and a hydrophobic non-woven fabric. It is used to keep the absorbed liquid in the absorbent core layer, thereby preventing the absorbed liquid from staining the wearer's pants.

[0003] When in use, the single-layer absorbent core relies on the natural diffusion of superabsorbent polymer particles. Urine tends to accumulate at the contact point, forming local saturation and causing a decrease in absorption rate. Furthermore, the absorbent core lacks a three-dimensional flow guiding structure, and after a large amount of urine is absorbed, it is easy for it to back seep to the surface due to pressure, causing skin problems such as diaper rash. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a high-diffusion baby diaper with good diversion effect and high absorption efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-diffusion baby diaper includes a diaper body, defined as extending longitudinally along the length direction of the diaper body and laterally along the width direction of the diaper body. The diaper body includes a liquid-permeable top layer, an absorbent core layer, and a liquid-impermeable bottom layer stacked sequentially from top to bottom. The diaper body has a front waist area, a back waist area, and a crotch area distributed along the longitudinal direction. The absorbent core layer has a first absorbent area located on one side of the transverse central axis and a second absorbent area located on the other side of the transverse central axis. The absorbent core layer has an upper edge and a lower edge distributed at both ends of the longitudinal direction, and a left edge and a right edge distributed at both ends of the transverse direction.

[0007] The absorbent core layer comprises a top nonwoven fabric, a middle nonwoven fabric, a bulky nonwoven fabric, a bottom nonwoven fabric, a wood pulp fiber layer, a first absorbent material layer, and a second absorbent material layer. The first absorbent material layer comprises first superabsorbent polymer (SAP) particles and first wood pulp fibers. The second absorbent material layer comprises second SAP particles. The second absorbent material layer is disposed between the bulky nonwoven fabric and the bottom nonwoven fabric, and some of the second SAP particles on the second absorbent material layer are embedded in the pores of the bulky nonwoven fabric. The first absorbent material layer is disposed between the bulky nonwoven fabric and the middle nonwoven fabric, and some of the first SAP particles on the first absorbent material layer are embedded in the pores of the bulky nonwoven fabric. The remaining first SAP particles are mixed with the first wood pulp fibers and distributed on the upper surface of the bulky nonwoven fabric. The average basis weight of the first SAP particles in the first absorbent material layer and the average basis weight of the second SAP particles in the second absorbent material layer are both 0.5 g / m³. 2 ~35g / m 2 ;

[0008] The first absorbent area of ​​the bulky nonwoven fabric is provided with a first guide area and a second guide area along the longitudinal direction, which do not contain the first and second superabsorbent polymer (SAP) particles. The longitudinal center of the first guide area coincides with the longitudinal center of the second guide area. The second absorbent area of ​​the bulky nonwoven fabric is provided with a third guide area and a fourth guide area along the longitudinal direction, which do not contain the first and second SAP particles. The longitudinal center of the third guide area coincides with the longitudinal center of the fourth guide area. The intermediate nonwoven fabric, the bulky nonwoven fabric, and the bottom nonwoven fabric are compositely connected at the first, second, third, and fourth guide areas. When the first and second SAP particles swell, the first and second guide areas of the first absorbent area form a first guide groove and a second guide groove, and the third and third guide areas of the second absorbent area form a third guide groove and a fourth guide groove. The wood pulp fiber layer is laid on the upper surface of the intermediate nonwoven fabric, and the top nonwoven fabric is composited on the upper surface of the wood pulp fiber layer.

[0009] Furthermore, the second guide channel is distributed on the lateral outer side of the first guide channel, the two ends of the first guide channel are not connected to the upper and lower edges in the longitudinal direction, the second guide channel has an arc-shaped structure, and the two ends of the second guide channel are respectively connected to the left edge. The fourth guide channel is distributed on the lateral outer side of the third guide channel, the two ends of the third guide channel are not connected to the upper and lower edges in the longitudinal direction, the fourth guide channel has an arc-shaped structure, and the two ends of the fourth guide channel are respectively connected to the right edge.

[0010] Furthermore, the longitudinal ends of the first and third guide channels extend into the front waist area and the rear waist area, respectively.

[0011] Furthermore, the second and fourth guide channels are distributed in the crotch area.

[0012] Furthermore, the first and third flow channels are filled with second wood pulp fibers located under the bulky nonwoven fabric, and the second wood pulp fibers are not bonded to the impermeable bottom layer.

[0013] Furthermore, the liquid-permeable surface layer includes a hydrophilic nonwoven fabric and hydrophobic nonwoven fabrics distributed and fixed on both sides of the hydrophilic nonwoven fabric. The hydrophilic nonwoven fabric adheres to the upper surface of the absorbent core layer and the two sides of the absorbent core layer, and adheres to the impermeable bottom layer together with the absorbent core layer. The outer side of the hydrophobic nonwoven fabric is folded to form a first leak-proof edge and a second leak-proof edge. The second leak-proof edge is distributed on the outer side of the first leak-proof edge. The height of the second leak-proof edge is greater than the height of the first leak-proof edge. A first elastic band is embedded in the free end of the first leak-proof edge, and a second elastic band is embedded in the free end of the second leak-proof edge.

[0014] Furthermore, the height of the first leak-proof edge is 2-3cm, and the height of the second leak-proof edge is 4-6cm.

[0015] Furthermore, the diaper body has a front waistband with a front baffle. The two lateral sides of the front baffle are respectively bonded to the upper surface of the first leak-proof baffle, and the outer longitudinal side of the front baffle is bonded to the upper surface of the hydrophilic nonwoven fabric. The front baffle covers one longitudinal side of the first and third flow channels. The diaper body also has a back baffle with a rear waistband. The two lateral sides of the back baffle are respectively bonded to the upper surface of the first leak-proof baffle, and the outer longitudinal side of the back baffle is bonded to the upper surface of the hydrophilic nonwoven fabric.

[0016] Furthermore, the average weight of the first superabsorbent polymer particles in the first absorbent material layer is less than the average weight of the second superabsorbent polymer particles in the second absorbent material layer.

[0017] Furthermore, the absorbency of the second absorbent material layer decreases in a stepwise manner from the longitudinal center of the diaper body to both longitudinal ends.

[0018] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This high-diffusivity baby diaper, through the setting of a first absorption area and a second absorption area, and the use of a multi-layer material combination with a specific structure in the absorbent core layer, including the distribution of the first and second superabsorbent polymer particles in different ways at relevant positions of the bulky nonwoven fabric, and the setting of a guide area without superabsorbent polymer particles in different absorption areas of the bulky nonwoven fabric, allows urine to be quickly dispersed to a larger area upon contact with the surface, avoiding local saturation and improving absorption efficiency. Specifically, urine enters the wood pulp fiber layer through the liquid-permeable surface layer and the top nonwoven fabric, utilizing the capillary pressure difference of the wood pulp fibers in the wood pulp fiber layer to form a "pull effect," allowing urine to contact the surface... The urine is quickly introduced into the inner layer after the first absorbent layer, and the expansion of the wood pulp fibers in the wood pulp fiber layer enables lateral flow and downward permeation. Some urine is absorbed and fixed by the first absorbent material layer, while the other part is guided and permeated in both the lateral and longitudinal directions through the first, second, third, and fourth guide channels, and then absorbed by the second absorbent material layer. The expanded nonwoven fabric can fix the first and second superabsorbent polymer (SAP) particles, preventing aggregation, and provides a large expansion space by combining with the first wood pulp fibers, improving the absorption efficiency of the SAP particles. Furthermore, when the SAP particles swell, they form guide channels, further enhancing the flow effect, effectively reducing urine backflow, lowering the risk of skin problems such as diaper rash, and improving the overall performance of the diaper. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0020] Figure 2 This is a top view of the unfolded diaper body in an embodiment of this utility model.

[0021] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0022] Figure 4 This is a top view of the structure of the bulky nonwoven fabric in an embodiment of this utility model. Detailed Implementation

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] The embodiment of this utility model is as follows:

[0025] refer to Figures 1 to 4As shown, a high-diffusion baby diaper includes a diaper body 1, defined as extending along the length direction of the diaper body 1 as the longitudinal direction and extending along the width direction of the diaper body 1 as the transverse direction. The diaper body 1 includes a liquid-permeable surface layer 11, an absorbent core layer 12, and a liquid-impermeable bottom layer 13 stacked sequentially from top to bottom. The diaper body 1 has a front waist area 101, a back waist area 102 distributed along the longitudinal direction, and a crotch area 103 distributed between the front waist area 101 and the back waist area 102. The absorbent core layer 12 has a first absorbent area 100 located on one transverse side of the transverse central axis and a second absorbent area 200 located on the other transverse side of the transverse central axis. The absorbent core layer 12 has an upper edge 201 and a lower edge 202 distributed at both ends of the longitudinal direction, and a left edge 203 and a right edge 204 distributed at both ends of the transverse direction.

[0026] The absorbent core layer 12 includes a top nonwoven fabric 121, a middle nonwoven fabric 122, a bulky nonwoven fabric 123, a bottom nonwoven fabric 124, a wood pulp fiber layer 125, a first absorbent material layer 126, and a second absorbent material layer 127. The first absorbent material layer 126 includes first superabsorbent polymer particles and first wood pulp fibers. The second absorbent material layer 127 includes second superabsorbent polymer particles. The second absorbent material layer 127 is disposed between the bulky nonwoven fabric 123 and the bottom nonwoven fabric 124, and a portion of the second superabsorbent polymer particles are on the second absorbent material layer 127. The first absorbent material layer 126 is embedded in the pores of the bulky nonwoven fabric 123 and is located between the bulky nonwoven fabric 123 and the intermediate nonwoven fabric 122. A portion of the first superabsorbent polymer particles on the first absorbent material layer 126 are embedded in the pores of the bulky nonwoven fabric 123, while another portion of the first superabsorbent polymer particles are mixed with the first wood pulp fibers and distributed on the upper surface of the bulky nonwoven fabric 123. The average basis weight of the first superabsorbent polymer particles in the first absorbent material layer 126 and the average basis weight of the second superabsorbent polymer particles in the second absorbent material layer 127 are both 0.5 g / m³. 2 ~35g / m 2 ;

[0027] The first absorption area 100 of the bulky nonwoven fabric 123 is provided with a first guide area 301 and a second guide area 302 along the longitudinal direction, which do not contain the first and second superabsorbent polymer particles. The longitudinal center of the first guide area 301 coincides with the longitudinal center of the second guide area 302. The second absorption area 200 of the bulky nonwoven fabric 123 is provided with a third guide area 303 and a fourth guide area 304 along the longitudinal direction, which do not contain the first and second superabsorbent polymer particles. The longitudinal center of the third guide area 303 coincides with the longitudinal center of the fourth guide area 304. The intermediate nonwoven fabric 122 and the bulky nonwoven fabric 123... The bottom nonwoven fabric 124 is compositely connected at the first guide zone 301, the second guide zone 302, the third guide zone 303 and the fourth guide zone 304. When the first superabsorbent polymer particles and the second superabsorbent polymer particles swell, the first guide zone 301 and the second guide zone 302 of the first absorption zone 100 form the first guide channel 401 and the second guide channel 402. The third guide zone 303 and the third guide zone 304 of the second absorption zone 200 form the third guide channel 403 and the fourth guide channel 404. The wood pulp fiber layer 125 is laid on the upper surface of the middle nonwoven fabric 122, and the top nonwoven fabric 121 is composited on the upper surface of the wood pulp fiber layer 125.

[0028] The top nonwoven fabric 121 and the wood pulp fiber layer 125 are pressed with a matrix-distributed concave pore structure 2 to increase the infiltration rate of urine and thus increase the absorption rate.

[0029] This high-absorption baby diaper utilizes a first absorbent zone 100 and a second absorbent zone 200, along with a multi-layered material combination with a specific structure in the absorbent core layer 12. This includes distributing first and second superabsorbent polymer (SAP) particles in different ways at relevant locations on the bulky nonwoven fabric 123, while simultaneously creating flow-guiding zones without SAP particles in different absorbent zones of the bulky nonwoven fabric 123. This allows urine to be quickly dispersed over a larger area upon contact with the fabric, thanks to the special structure and flow-guiding zone design, avoiding localized saturation and improving absorption efficiency. Specifically, urine passes through the permeable surface layer 11 and the top nonwoven fabric into the wood pulp fiber layer 125. The capillary pressure difference within the wood pulp fiber layer 125 creates a "pull effect," causing the urine to be rapidly guided into the inner layer after contact with the surface layer. The wood pulp fibers in the wood pulp fiber layer 125 are loosely arranged to achieve lateral flow guidance and downward seepage. Part of the urine is absorbed and fixed by the first absorbent material layer 126, while the other part is guided and seeped in both the lateral and longitudinal directions through the first guide channel 401, the second guide channel 402, the third guide channel 403, and the fourth guide channel 404, and then absorbed by the second absorbent material layer 127. The loosely arranged non-woven fabric 123 can fix the first and second superabsorbent polymer particles, preventing aggregation, and provides a large expansion space by combining with the first wood pulp fibers, improving the absorption efficiency of the superabsorbent polymer particles. When the superabsorbent polymer particles swell, they form guide channels, further enhancing the flow guidance effect, effectively reducing urine backflow, lowering the risk of skin problems such as diaper rash, and improving the overall performance of the diaper.

[0030] Furthermore, the second guide channel 402 is distributed on the lateral outer side of the first guide channel 401. The longitudinal ends of the first guide channel are not connected to the upper edge 201 and the lower edge 202. The second guide channel 402 has an arc-shaped structure. The longitudinal ends of the second guide channel 402 are respectively connected to the left edge 203. The fourth guide channel 404 is distributed on the lateral outer side of the third guide channel 403. The longitudinal ends of the third guide channel 403 are not connected to the upper edge 201 and the lower edge 202. The fourth guide channel 404 has an arc-shaped structure. The fourth guide channel 404 is connected to the right edge 204 at both longitudinal ends. The second guide channel 402 is distributed laterally outside the first guide channel 401 and has an arc-shaped structure. The fourth guide channel 404 is distributed laterally outside the third guide channel 403 and also has an arc-shaped structure. This design better conforms to the curves of an infant's body, better guiding urine to diffuse along a specific path during urine absorption, resulting in more even urine distribution and further improving absorption efficiency and guiding effect. Simultaneously, the arc-shaped structure helps reduce friction on the infant's skin, enhancing wearing comfort.

[0031] Furthermore, the longitudinal ends of the first guide channel 401 and the third guide channel 403 extend into the front waist area 101 and the back waist area 102, respectively. This design allows urine to spread more widely to the front and back areas of the diaper during absorption, making full use of the overall absorption space of the diaper, avoiding urine concentration in the crotch area, further improving absorption capacity and absorption efficiency, and reducing problems such as side leakage caused by local absorption saturation.

[0032] Furthermore, the second guide channel 402 and the fourth guide channel 404 are distributed in the crotch area 103. The crotch area is where urine is most likely to accumulate. Setting guide channels in this area can quickly disperse the urine that has accumulated here, prevent urine from accumulating in the crotch area, effectively reduce the absorption pressure in the crotch area, improve the absorption and flow performance of this key part, reduce the risk of urine back seeping to the surface, and better protect the baby's skin.

[0033] Furthermore, the first and third diversion channels 401 and the third diversion channel 403 are filled with second wood pulp fibers 3 located under the bulky nonwoven fabric 123. The second wood pulp fibers 3 are not compositely connected with the liquid-impermeable bottom layer 13. The second wood pulp fibers 3 can absorb a certain amount of urine, playing an auxiliary absorption role. At the same time, since they are not compositely connected with the liquid-impermeable bottom layer 1, the absorbed urine can spread more smoothly inside the diaper and be absorbed by other absorbent layers, further enhancing the absorbency and diversion effect of the diaper.

[0034] Furthermore, the liquid-permeable surface layer 11 includes a hydrophilic nonwoven fabric 111 and hydrophobic nonwoven fabric 112 distributed and fixed on both transverse sides of the hydrophilic nonwoven fabric 111. The hydrophilic nonwoven fabric 111 adheres to the upper surface of the absorbent core layer 12 and the transverse sides of the absorbent core layer 12, and adheres to the impermeable bottom layer 13 together with the absorbent core layer 12. The transverse outer sides of the hydrophobic nonwoven fabric 122 are folded to form a first leak-proof edge 4 and a second leak-proof edge 5. The second leak-proof edge 5 is distributed on the transverse outer side of the first leak-proof edge 4, and the height dimension of the second leak-proof edge 5 is greater than the height dimension of the first leak-proof edge 4. The free end of the first leak-proof edge 4 is inside... The first elastic band 6 is embedded in the second leak-proof edge 5, and the free end of the second leak-proof edge 5 is embedded with a second elastic band 7. The liquid-permeable surface layer 11 is made of hydrophilic non-woven fabric 111 and is adhered to the relevant surface of the absorbent core layer 12 and adhered to the liquid-impermeable bottom layer 13, which ensures good liquid permeability and allows urine to quickly pass through the surface layer into the absorbent core layer 12. The hydrophobic non-woven fabric 122 is folded to form the first leak-proof edge 4 and the second leak-proof edge 5 of different heights and is embedded with elastic bands, which can effectively prevent urine side leakage. The edge design of different heights can provide targeted protection according to the leak-proof needs of different parts of the baby's body, which improves the reliability and comprehensiveness of leak prevention.

[0035] Furthermore, the height of the first leak-proof baffle 4 is 2-3cm, preferably 3cm, and the height of the second leak-proof baffle 5 is 4-6cm, preferably 5cm. This specific size range is optimized based on the infant's physical characteristics and actual usage needs, which can ensure a good leak-proof effect without affecting the infant's comfort of movement due to the baffle being too high, thus achieving a good balance between leak-proof performance and wearing comfort.

[0036] Furthermore, the diaper body 1 has a front waistband 101 with a front baffle 8. The two lateral sides of the front baffle 8 are respectively bonded to the upper surface of the first leak-proof edge 4, and the outer longitudinal side of the front baffle 8 is bonded to the upper surface of the hydrophilic nonwoven fabric 111. The front baffle 8 covers one longitudinal side of the first guide channel 401 and the third guide channel 403. The diaper body 1 also has a back baffle 9 in the front waistband 101. The two lateral sides of the back baffle 9 are respectively bonded to the upper surface of the first leak-proof edge 4, and the outer longitudinal side of the back baffle 9 is bonded to the hydrophilic nonwoven fabric 111. On the upper surface, the longitudinal width of the front baffle 8 is greater than that of the rear baffle 9. The front baffle 8 is provided in the front waist area 101 and the rear baffle 9 is provided in the rear waist area 102. The front baffle 8 covers one longitudinal side of the first guide channel 401 and the third guide channel 403, which can further prevent urine from overflowing from the longitudinal side of the guide channel and enhance the leak-proof performance of the diaper in the front and rear waist areas. At the same time, the composite connection between the baffle, the first leak-proof edge, and the hydrophilic non-woven fabric ensures the stability of the baffle, making it less likely to shift during the baby's activities, and effectively improving the overall leak-proof effect of the diaper.

[0037] Furthermore, the average weight of the first superabsorbent polymer particles in the first absorbent material layer 126 is less than the average weight of the second superabsorbent polymer particles in the second absorbent material layer 127. This differentiated design allows different absorbent layers to play different roles when absorbing urine. The first absorbent material layer 126 can quickly absorb and initially disperse urine, while the second absorbent material layer 127, with its higher superabsorbent polymer particle weight, has stronger absorption and water-locking capabilities, better able to handle large amounts of urine, improve overall absorption efficiency and absorption capacity, and at the same time rationally allocate the resources of the absorbent layers to optimize absorption performance.

[0038] Furthermore, the absorbency of the second absorbent material layer 127 decreases in a stepwise manner from the longitudinal center of the diaper body 1 to both longitudinal ends, which conforms to the distribution pattern of urine on the diaper. The longitudinal center is usually the area where urine first comes into contact and in large quantities. Setting a higher absorbency can quickly absorb a large amount of urine, while the absorbency gradually decreases towards both ends. This ensures the uniformity of overall absorption, makes reasonable use of the absorbent layer material, avoids material waste, and improves the efficiency and economy of diaper use.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A high-diffusivity baby diaper, characterized in that: The diaper includes a diaper body, defined as extending along the length direction of the diaper body as the longitudinal direction and extending along the width direction of the diaper body as the transverse direction. The diaper body includes a liquid-permeable top layer, an absorbent core layer, and a liquid-impermeable bottom layer stacked sequentially from top to bottom. The diaper body has a front waist area, a back waist area, and a crotch area distributed along the longitudinal direction. The absorbent core layer has a first absorbent area located on one side of the transverse central axis and a second absorbent area located on the other side of the transverse central axis. The absorbent core layer has an upper edge and a lower edge distributed at both ends of the longitudinal direction, and a left edge and a right edge distributed at both ends of the transverse direction. The absorbent core layer comprises a top nonwoven fabric, a middle nonwoven fabric, a bulky nonwoven fabric, a bottom nonwoven fabric, a wood pulp fiber layer, a first absorbent material layer, and a second absorbent material layer. The first absorbent material layer comprises first superabsorbent polymer (SAP) particles and first wood pulp fibers. The second absorbent material layer comprises second SAP particles. The second absorbent material layer is disposed between the bulky nonwoven fabric and the bottom nonwoven fabric, and some of the second SAP particles on the second absorbent material layer are embedded in the pores of the bulky nonwoven fabric. The first absorbent material layer is disposed between the bulky nonwoven fabric and the middle nonwoven fabric, and some of the first SAP particles on the first absorbent material layer are embedded in the pores of the bulky nonwoven fabric. The remaining first SAP particles are mixed with the first wood pulp fibers and distributed on the upper surface of the bulky nonwoven fabric. The average basis weight of the first SAP particles in the first absorbent material layer and the average basis weight of the second SAP particles in the second absorbent material layer are both 0.5 g / m³. 2 ~35g / m 2 ; The first absorbent area of ​​the bulky nonwoven fabric is provided with a first guide area and a second guide area along the longitudinal direction, which do not contain the first and second superabsorbent polymer (SAP) particles. The longitudinal center of the first guide area coincides with the longitudinal center of the second guide area. The second absorbent area of ​​the bulky nonwoven fabric is provided with a third guide area and a fourth guide area along the longitudinal direction, which do not contain the first and second SAP particles. The longitudinal center of the third guide area coincides with the longitudinal center of the fourth guide area. The intermediate nonwoven fabric, the bulky nonwoven fabric, and the bottom nonwoven fabric are compositely connected at the first, second, third, and fourth guide areas. When the first and second SAP particles swell, the first and second guide areas of the first absorbent area form a first guide groove and a second guide groove, and the third and third guide areas of the second absorbent area form a third guide groove and a fourth guide groove. The wood pulp fiber layer is laid on the upper surface of the intermediate nonwoven fabric, and the top nonwoven fabric is composited on the upper surface of the wood pulp fiber layer.

2. The high-diffusivity baby diaper according to claim 1, characterized in that: The second guide channel is distributed on the lateral outer side of the first guide channel. The two ends of the first guide channel are not connected to the upper and lower edges in the longitudinal direction. The second guide channel has an arc-shaped structure. The two ends of the second guide channel are connected to the left edge respectively. The fourth guide channel is distributed on the lateral outer side of the third guide channel. The two ends of the third guide channel are not connected to the upper and lower edges in the longitudinal direction. The fourth guide channel has an arc-shaped structure. The two ends of the fourth guide channel are connected to the right edge respectively.

3. The high-diffusivity baby diaper according to claim 2, characterized in that: The first and third guide channels extend longitudinally to the front waist area and the rear waist area, respectively.

4. The high-diffusivity baby diaper according to claim 3, characterized in that: The second and fourth guide channels are located in the crotch area.

5. The high-diffusivity baby diaper according to claim 4, characterized in that: The first and third flow channels are filled with second wood pulp fibers located under the bulky nonwoven fabric. The second wood pulp fibers are not bonded to the impermeable bottom layer.

6. The high-diffusivity baby diaper according to any one of claims 1 to 5, characterized in that: The liquid-permeable surface layer includes a hydrophilic nonwoven fabric and a hydrophobic nonwoven fabric distributed and fixed on both sides of the hydrophilic nonwoven fabric. The hydrophilic nonwoven fabric adheres to the upper surface of the absorbent core layer and the two sides of the absorbent core layer, and adheres to the impermeable bottom layer together with the absorbent core layer. The outer sides of the hydrophobic nonwoven fabric are folded to form a first leak-proof edge and a second leak-proof edge. The second leak-proof edge is distributed on the outer side of the first leak-proof edge. The height of the second leak-proof edge is greater than the height of the first leak-proof edge. A first elastic band is embedded in the free end of the first leak-proof edge, and a second elastic band is embedded in the free end of the second leak-proof edge.

7. The high-diffusivity baby diaper according to claim 6, characterized in that: The height of the first leak-proof barrier is 2-3cm, and the height of the second leak-proof barrier is 4-6cm.

8. The high-diffusivity baby diaper according to claim 7, characterized in that: The diaper body has a front waistband with a front baffle. The two lateral sides of the front baffle are respectively bonded to the upper surface of the first leak-proof baffle, and the outer longitudinal side of the front baffle is bonded to the upper surface of the hydrophilic nonwoven fabric. The front baffle covers one longitudinal side of the first and third flow channels. The diaper body also has a back baffle with a back baffle. The two lateral sides of the back baffle are respectively bonded to the upper surface of the first leak-proof baffle, and the outer longitudinal side of the back baffle is bonded to the upper surface of the hydrophilic nonwoven fabric.

9. The high-diffusivity baby diaper according to claim 8, characterized in that: The average weight of the first superabsorbent polymer particles in the first absorbent material layer is less than the average weight of the second superabsorbent polymer particles in the second absorbent material layer.

10. The high-diffusivity baby diaper according to claim 9, characterized in that: The absorbency of the second absorbent material layer decreases in a stepwise manner from the longitudinal center of the diaper body to both longitudinal ends.

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