A surface layer paper diaper with 3D raised dots

Abstract

The present application relates to the field of disposable sanitary products, and particularly relates to a surface layer paper diaper with 3D convex points, which mainly solves the problem of poor air permeability and liquid permeability of the surface layer of the paper diaper in the prior art, and improves the air permeability and liquid permeability of the surface layer, and comprises a paper diaper body, the paper diaper body has a front waist area, a crotch area and a back waist area which are sequentially distributed along a longitudinal direction, the paper diaper body comprises a liquid permeable surface layer, an absorbent core layer and a liquid impermeable bottom layer which are sequentially stacked from top to bottom, the liquid permeable surface layer comprises a hydrophilic non-woven fabric, hydrophobic non-woven fabrics arranged on both sides of the hydrophilic non-woven fabric in the transverse direction and an elastic rubber band, the hydrophilic non-woven fabric covers the upper surface and the transverse two side surfaces of the absorbent core layer, the transverse outer side edges of the hydrophobic non-woven fabric are bent upwards, and the elastic rubber band is arranged at the free end of the hydrophobic non-woven fabric to form a leakage prevention baffle, and a water following area with a width size of 3mm-8mm is hot-pressed between the leakage prevention baffle and the absorbent core layer.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products, and more particularly to a diaper with a surface layer having 3D raised dots. Background Technology

[0002] The structure of a diaper generally consists of, from top to bottom, a liquid-permeable top layer, an absorbent core layer, and a liquid-impermeable bottom layer, all stacked together. The absorbent core layer is typically composed of a mixture of superabsorbent polymer particles and wood pulp fibers, wrapped in nonwoven fabric to form a single block structure, used to absorb and retain bodily excrement. The liquid-permeable top layer is composed of hydrophilic nonwoven fabric and hydrophobic nonwoven fabric fixed to both sides of the hydrophilic nonwoven fabric, providing a comfortable and dry feel 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, water-impermeable membrane and hydrophobic nonwoven fabric, used to retain absorbed liquid within the absorbent core layer, thus preventing the absorbed liquid from staining the wearer's pants.

[0003] Traditional disposable diapers have a relatively simple surface structure, resulting in poor liquid permeability and breathability. This causes urine to accumulate on the surface layer and not be effectively absorbed by the absorbent core layer. This can lead to prolonged contact between the baby's skin and urine, causing skin problems such as diaper rash. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention provides a diaper with a surface layer having 3D raised dots, which mainly solves the problem of poor breathability and liquid permeability of the surface layer of diapers in the prior art, resulting in poor comfort.

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

[0006] A diaper with 3D raised dots includes a diaper body, defined as extending longitudinally along the length of the diaper body and laterally along the width of the diaper body. The diaper body has a front waist area, a crotch area, and a back waist area distributed sequentially along the longitudinal 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 liquid-permeable top layer includes a hydrophilic nonwoven fabric, a hydrophobic nonwoven fabric disposed on both lateral sides of the hydrophilic nonwoven fabric, and elastic bands. The hydrophilic nonwoven fabric covers the upper surface and both lateral sides of the absorbent core layer. The outer lateral side of the hydrophobic nonwoven fabric is bent upward, and the elastic bands are disposed at the free ends of the hydrophobic nonwoven fabric to form a leak-proof side. A water-resistant area with a width of 3mm to 8mm is heat-pressed between the leak-proof side and the absorbent core layer.

[0007] The hydrophilic nonwoven fabric has multiple sets of first and second breathable and water-permeable units distributed on it. These units are staggered in the transverse direction. Each first breathable and water-permeable unit includes multiple first 3D protrusions arranged in a row along the longitudinal direction, with a first water-passing channel formed between adjacent first 3D protrusions. Each first 3D protrusion has a first set of air vents. Each second breathable and water-permeable unit includes multiple second 3D protrusions arranged in a row along the longitudinal direction, with a second water-passing channel formed between adjacent second 3D protrusions. The first and second water-passing channels located in the same transverse direction are connected and staggered. The second 3D convex dot is provided with a second group of breathable holes. The first 3D convex dot and the second 3D convex dot are distributed in a rotationally symmetrical manner. The two lateral ends of the first 3D convex dot of the first breathable and water-permeable unit are interlocked with one lateral end of the second 3D convex dot of the adjacent second breathable and water-permeable unit to form a water-blocking area. The first group of breathable holes on the first 3D convex dot and the second group of breathable holes on the second 3D convex dot are located on the same straight line in the same lateral direction. The periphery of the first 3D convex dot and the second 3D convex dot are hot-pressed onto the surface of the absorbent core layer. The hydrophilic nonwoven fabric has a unit water permeability of no more than 18 mL / g measured under a pressure of 3.2 KPa.

[0008] Furthermore, both the first and second 3D convex points are raised structures, resulting in cavities within them. Both the first and second 3D convex points are defined to have a highest point. The first group of vent holes is distributed around the highest point of the first 3D convex point and faces the first water passage. The second group of vent holes is distributed around the highest point of the second 3D convex point and faces the second water passage.

[0009] Furthermore, both the first and second vent groups include a first through hole and a plurality of second through holes arranged around the first through hole, wherein the diameter of the first through hole is larger than the diameter of the second through hole.

[0010] Furthermore, the two transverse sides of the hydrophilic nonwoven fabric are respectively compositely connected to the middle of the two hydrophobic nonwoven fabrics to form a connection area. The hydrophobic area is distributed in the connection area, and the transverse inner side of the hydrophobic nonwoven fabric is distributed between the absorbent core layer and the liquid-impermeable bottom layer.

[0011] Furthermore, the absorbent core layer includes a first absorber, a second absorber, a third absorber, and a wrapping layer. The second and third absorbers are located below the first absorber and distributed on both sides of the transverse central axis of the first absorber. The second and third absorbers are respectively connected to the lower surface of the first absorber. There is a gap between the second and third absorbers. The outer transverse sides of the second and third absorbers each have an extension portion extending outward. The wrapping layer covers the outer sides of the first, second, and third absorbers. Through the wrapping layer, the two extension portions are folded upward and attached to the two transverse sides of the first absorber.

[0012] Furthermore, the upper surface of the first absorbent is pressed with multiple grooves in parallel along the longitudinal direction, which correspond to the first air-permeable and water-permeable unit and the second air-permeable and water-permeable unit respectively. The first absorbent includes an upper non-woven fabric, a lower non-woven fabric, and absorbent material disposed between the upper and lower non-woven fabrics. Multiple seepage holes without absorbent material are provided between the upper and lower non-woven fabrics and at the grooves. Each seepage hole is distributed at intervals along the longitudinal direction of the groove.

[0013] Furthermore, each of the grooves is filled with first wood pulp fibers. When the periphery of the first 3D stereoscopic protrusion and the second 3D stereoscopic protrusion are hot-pressed onto the surface of the absorbent core layer, a portion of the first wood pulp fibers fill the cavities of the first 3D stereoscopic protrusion and the second 3D stereoscopic protrusion.

[0014] Furthermore, the gap between the second absorber and the third absorber is filled with second wood pulp fibers.

[0015] Furthermore, the inner surface of the leak-proof partition and the transverse outer layer located in the downstream zone are composited with a longitudinal water-guiding layer.

[0016] Furthermore, the surface of the longitudinal water guiding layer is pressed with a first water guiding groove and a second water guiding groove in a V-shape, and the first water guiding groove and the second water guiding groove are axially symmetrically distributed along the central axis of the longitudinal water guiding layer.

[0017] By adopting the aforementioned technical solution, the beneficial effects of this invention are as follows: This diaper with 3D raised dots has multiple sets of first and second breathable and water-permeable units distributed on the hydrophilic non-woven fabric, staggered in the transverse direction. Furthermore, the first and second water-permeable channels are connected and intersected. This design increases the flow path of urine, improves liquid permeability and breathability, allowing urine to be absorbed more quickly by the absorbent core layer, reducing urine accumulation on the surface layer, and decreasing the contact time between the baby's skin and urine, effectively preventing diaper rash. Additionally, the first and second 3D raised dots are rotationally symmetrically distributed and interlock to form a water-blocking area, ensuring that urine can smoothly pass through the water-permeable channels. The absorbent core layer is incorporating features that prevent longitudinal diffusion of urine, providing excellent water resistance and enhancing its absorption efficiency. A 3mm-8mm wide drainage zone is heat-pressed between the leak-proof side panels and the absorbent core layer, allowing urine to flow longitudinally and smoothly into the absorbent core layer from the side, further improving leak prevention. Simultaneously, 3D raised dots increase the contact area between the surface layer and the baby's skin, enhancing comfort. Furthermore, the hydrophilic nonwoven fabric has a permeability of no more than 18mL / g measured under 3.2KPa pressure, ensuring excellent permeability and allowing urine to be quickly absorbed, thus improving comfort. Attached Figure Description

[0018] Figure 1 This is a top view of the structure according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present invention;

[0020] Figure 3 This is a top view schematic diagram of the hydrophilic nonwoven fabric in an embodiment of the present invention;

[0021] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0022] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure at point BB;

[0023] Figure 6 This is a schematic diagram of the longitudinal water-conducting layer in an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the instrument structure for detecting the unit water permeability of hydrophilic nonwoven fabric in an embodiment of the present invention.

[0025] Figure caption:

[0026] 1. Diaper body; 2. First breathable and water-permeable unit; 3. Second breathable and water-permeable unit; 4. Chamber; 5. Groove; 6. First wood pulp fiber; 7. Second wood pulp fiber; 8. Drainage hole;

[0027] 11. Permeable surface layer; 12. Absorbent core layer; 13. Impermeable bottom layer; 14. Flow zone; 15. Water-blocking zone; 16. Connecting zone; 17. Longitudinal water-conducting layer; 18. First water-conducting channel; 19. Second water-conducting channel;

[0028] 20. First 3D raised dot; 21. First water flow channel; 22. First vent hole group; 30. Second 3D raised dot; 31. Second water flow channel; 32. Second vent hole group;

[0029] 111. Hydrophilic nonwoven fabric; 112. Hydrophobic nonwoven fabric; 113. Elastic elastic band; 121. First absorbent; 122. Second absorbent; 123. Third absorbent; 124. Covering layer; 125. Extension;

[0030] 100. Leak-proof partition; 101. Front waist area; 102. Crotch area; 103. Back waist area; 201. First through hole; 202. Second through hole; 301. Upper non-woven fabric; 302. Lower non-woven fabric; 303. Absorbent material;

[0031] 400. Sample; 401. Inclined plate; 402. Horizontal plate; 403. Funnel; 404. Clamp; 405. Press block; 406. Beaker. Detailed Implementation

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0033] The embodiments of the present invention are as follows:

[0034] refer to Figures 1 to 6As shown, a diaper with 3D raised dots includes a diaper body 1. The longitudinal direction is defined as extending along the length of the diaper body 1, and the transverse direction is defined as extending along the width of the diaper body 1. The diaper body 1 has a front waist area 101, a crotch area 102, and a back waist area 103 sequentially distributed along the longitudinal direction. The diaper body 1 includes a liquid-permeable top layer 11, an absorbent core layer 12, and a liquid-impermeable bottom layer 13, stacked sequentially from top to bottom. The liquid-permeable top layer 11 includes hydrophilic non-permeable... The nonwoven fabric 111, the hydrophobic nonwoven fabric 112 disposed on both sides of the hydrophilic nonwoven fabric 111, and the elastic band 113 are provided. The hydrophilic nonwoven fabric 111 covers the upper surface and both sides of the absorbent core layer 12. The outer side of the hydrophobic nonwoven fabric 112 is bent upward, and the elastic band 113 is disposed at the free end of the hydrophobic nonwoven fabric 112 to form a leak-proof partition 100. A water-repellent area 14 with a width of 3mm to 8mm, preferably 6mm, is hot-pressed between the leak-proof partition 100 and the absorbent core layer 12.

[0035] The hydrophilic nonwoven fabric 111 has multiple sets of first air-permeable and water-permeable units 2 and second air-permeable and water-permeable units 3 distributed on it. Each first air-permeable and water-permeable unit 2 and each second air-permeable and water-permeable unit 3 are staggered in the transverse direction. Each first air-permeable and water-permeable unit 2 includes multiple first 3D three-dimensional protrusions 20 arranged in a row in the longitudinal direction. A first water-passing channel 21 is formed between adjacent first 3D three-dimensional protrusions 20. Each first 3D three-dimensional protrusion 20 has a first air-permeable hole group 22. Each second air-permeable and water-permeable unit 3 includes multiple second 3D three-dimensional protrusions 30 arranged in a row in the longitudinal direction. A second water-passing channel 31 is formed between adjacent second 3D three-dimensional protrusions 30. The first water-passing channels 21 and the second water-passing channels 31 located in the same transverse direction are connected and staggered. The second 3D convex point 30 is provided with a second air vent group 32. The first 3D convex point 20 and the second 3D convex point 30 are rotationally symmetrically distributed. The two lateral ends of the first 3D convex point 20 of the first air-permeable and water-permeable unit 2 and the lateral end of the second 3D convex point 30 of the adjacent second air-permeable and water-permeable unit 3 are interlocked to form a water-blocking area 15. The first air vent group 22 on the first 3D convex point 20 and the second air vent group 32 on the second 3D convex point 30 are located on the same straight line in the same lateral direction. The periphery of the first 3D convex point 20 and the second 3D convex point 30 are hot-pressed onto the surface of the absorbent core layer 12. The hydrophilic nonwoven fabric 111 has a unit water permeability of no more than 18 mL / g measured under a pressure of 3.2 KPa.

[0036] This diaper features a 3D raised surface layer. Multiple sets of first and second breathable / water-permeable units 2 and 3 are distributed alternately in the transverse direction on the hydrophilic non-woven fabric 111. The first and second water-permeable channels 21 are connected and interwoven. This design increases the flow path of urine, improves permeability and breathability, allowing urine to be absorbed more quickly by the absorbent core layer 12, reducing urine accumulation on the surface layer, and shortening the contact time between the baby's skin and urine, effectively preventing diaper rash. Furthermore, the first and second 3D raised dots 20 and 30 are rotationally symmetrically distributed and interlock to form a water-blocking area 15, ensuring that urine can smoothly pass through the water-permeable channels into the absorbent core layer 12 while preventing... The design prevents longitudinal urine diffusion, effectively blocking water and improving the absorption efficiency of the absorbent core layer 12. It also features a 3mm-8mm wide drainage zone 14 heat-pressed between the leak-proof sidewall 100 and the absorbent core layer 12. This drainage zone 14 facilitates longitudinal urine flow, guiding urine smoothly into the absorbent core layer 12 from the side, further enhancing the leak-proof effect. Simultaneously, the 3D raised dots increase the contact area between the surface layer and the baby's skin, improving comfort. Furthermore, the hydrophilic nonwoven fabric 111 has a permeability of no more than 18mL / g measured under 3.2KPa pressure, ensuring excellent permeability of the surface layer and allowing urine to be quickly absorbed, thus improving comfort.

[0037] Specifically, both the first 3D convex point 20 and the second 3D convex point 30 are raised structures, resulting in cavities 4 within them. Both the first 3D convex point 20 and the second 3D convex point 30 have a highest point. The first vent group 22 is distributed around the highest point of the first 3D convex point 20 and faces the first water passage 21. The second vent group 32 is distributed around the highest point of the second 3D convex point 30 and faces the second water passage. 31, which allows the ventilation holes to ensure air circulation and enhance the breathability of the diaper, while preventing urine from leaking out of the ventilation holes. It ensures breathability without affecting the leak-proof performance, providing a dry and comfortable environment for the baby. During use, the diaper body is bent and attached to the user's skin. When urine enters, the first 3D raised dots 20 and the second 3D raised dots 30 form an overflow area, which seeps down through the first ventilation hole group 22 and the second ventilation hole group 32, improving the absorption efficiency of the absorbent core layer 12.

[0038] Furthermore, both the first ventilation hole group 22 and the second ventilation hole group 32 include a first through hole 201 and a plurality of second through holes 202 arranged around the first through hole 201. The diameter of the first through hole 201 is larger than the diameter of the second through hole 202. This multi-level through hole structure further optimizes the breathability. The large-diameter first through hole 201 ensures rapid air circulation, while the small-diameter second through holes 202 increase the breathable area and help to evenly disperse the airflow, thereby improving the overall breathability uniformity of the diaper.

[0039] Furthermore, the two transverse sides of the hydrophilic nonwoven fabric 111 are respectively compositely connected to the middle of the two hydrophobic nonwoven fabrics 112 to form a connection area 16. The water-flow zone 14 is distributed in the connection area 16. The transverse inner side of the hydrophobic nonwoven fabric 112 is distributed between the absorbent core layer 12 and the liquid-impermeable bottom layer 13, so that urine can enter the absorbent core layer 12 more smoothly through the water-flow zone 14 during the inflow process, which improves the urine conduction efficiency. At the same time, the transverse inner side of the hydrophobic nonwoven fabric 112 is distributed between the absorbent core layer 12 and the liquid-impermeable bottom layer 13, which enhances the leak-proof performance and prevents urine from leaking from the side.

[0040] In this embodiment, the absorbent core layer 12 includes a first absorber 121, a second absorber 122, a third absorber 123, and a wrapping layer 124. The second absorber 122 and the third absorber 123 are disposed on the lower side of the first absorber 121 and distributed on both sides of the transverse central axis of the first absorber 121. The second absorber 122 and the third absorber 123 are respectively compositely connected to the lower surface of the first absorber 121. There is a gap between the second absorber 122 and the third absorber 123. The transverse outer sides of the second absorber 122 and the third absorber 123 each have an extension portion 125 extending outward. The wrapping layer 124 covers the outside of the first absorber 121, the second absorber 122, and the third absorber 123. Through the wrapping layer 124, the two extension portions 125 are folded upward and attached to the first absorber 121 respectively. The distribution of the absorbent core 12 on both sides allows it to absorb urine more evenly, increasing absorption capacity, improving its flexibility and breathability, thus enhancing comfort. It also expands the absorption area and improves absorption efficiency. During use, the second absorbent 122 and the third absorbent 123 are respectively connected to the lower surface of the first absorbent 121, and the two extensions 125 are folded upwards and attached to the two sides of the first absorbent 121 by the wrapping layer 124. This allows the extensions 125 to be opened or closed depending on the tightness of the wrapping layer 124, dynamically adjusting the overall softness of the absorbent core 12 and enhancing its structural stability. It also helps guide urine to diffuse to both absorbent sides, improving overall absorption capacity and further enhancing the comfort of using the absorbent core 12.

[0041] Furthermore, the upper surface of the first absorbent 121 has multiple grooves 5 pressed side by side along the longitudinal direction, corresponding to the first breathable and water-permeable unit 2 and the second breathable and water-permeable unit 3 respectively. The first absorbent 121 includes an upper non-woven fabric 301, a lower non-woven fabric 302, and absorbent material 303 disposed between the upper non-woven fabric 301 and the lower non-woven fabric 302. Multiple infiltration holes 8 without absorbent material are provided between the upper non-woven fabric 301 and the lower non-woven fabric 302 and at the grooves 5. Each infiltration hole 8 is spaced apart along the longitudinal direction of the grooves 5. The grooves 5 can guide urine to flow quickly into the absorbent core layer 12, and the infiltration holes 8 increase the channels for urine to seep down, so that urine can be absorbed by the absorbent material 303 more quickly, thereby improving the absorption speed and efficiency.

[0042] Meanwhile, each of the grooves 5 is filled with first wood pulp fibers 6. When the periphery of the first 3D stereoscopic protrusions 20 and the second 3D stereoscopic protrusions 30 is hot-pressed onto the surface of the absorbent core layer 12, some of the first wood pulp fibers 6 fill the cavities 4 of the first 3D stereoscopic protrusions 20 and the second 3D stereoscopic protrusions 30. Wood pulp fibers have good liquid absorption properties. When filled in the grooves 5 and cavities 4, they further enhance the absorption capacity of the absorbent core layer 12 and help keep the surface dry.

[0043] Furthermore, the gap between the second absorbent 122 and the third absorbent 123 is filled with second wood pulp fibers 7, so that the absorbent core layer 12 forms a continuous and complete absorbent structure, which improves the overall absorption capacity, ensures that urine can be fully absorbed, reduces urine residue, and enhances the longitudinal conduction capacity of urine, thereby improving the absorption efficiency of the absorbent core layer 12.

[0044] In this embodiment, the inner surface of the leak-proof partition 100 and the transverse outer layer located in the drainage area 14 are composited with a longitudinal water-guiding layer 17, which can quickly guide urine from the leak-proof partition 100 area to the absorbent core layer 12, further improving the urine conduction speed, enhancing the leak-proof effect, and preventing urine from accumulating at the leak-proof partition. The surface of the longitudinal water-guiding layer 17 is pressed with a first water-guiding groove 18 and a second water-guiding groove 19 in a V-shape. The first water-guiding groove 18 and the second water-guiding groove 19 are axially symmetrically distributed along the central axis of the longitudinal water-guiding layer. The V-shaped water-guiding groove can more effectively guide the flow of urine, so that the urine is quickly and evenly dispersed into the absorbent core layer 12 along the water-guiding groove, improving the uniformity of urine absorption and further enhancing the overall performance of the diaper.

[0045] In this embodiment, the hydrophilic nonwoven fabric 111 has a water permeability of no more than 18 mL / g measured under a pressure of 3.2 kPa, and the detection method is as follows:

[0046] refer to Figure 7 As shown, prepare the instruments:

[0047] Balance: Accuracy 0.01g;

[0048] The testing instrument has an inclined plate 401 and a horizontal plate 402, wherein one edge of the inclined plate 401 is hinged to one edge of the horizontal plate 402.

[0049] Funnel 403: 150mL;

[0050] Clips made of 404 stainless steel;

[0051] Press block 405: Diameter 100mm, weight 3.2±0.002kg;

[0052] Beaker 406: 500mL;

[0053] Graduated cylinders: 100mL and 10mL;

[0054] Stopwatch: Accuracy 0.01s;

[0055] 0.9% sodium chloride solution: A solution prepared by adding 9.0g of sodium chloride to 1000mL of distilled water.

[0056] Testing steps:

[0057] a. Prepare 5 hydrophilic nonwoven fabrics 111 as samples 400. After testing, remove the maximum and minimum values ​​from the 5 test results and take the arithmetic mean of the remaining 3 as the final test result, accurate to 1 mL.

[0058] b. Measure the mass m of each sample using a balance;

[0059] c. First, place the tester in a horizontal position. Manually adjust the angle between the tilt plate 401 and the horizontal plate 402 to 30°±2°. Then, adjust the lower opening of the funnel 403 so that the projection distance of its center from the upper edge of the tilt plate 401 of the tester is 200±2mm. The opening of the lower opening of the funnel 403 faces the operator. Pour an appropriate amount of test solution into the funnel 403 to wet the funnel, and rinse the funnel 403 twice with the test solution.

[0060] d. Take one sample 400 to be tested and place it flat on the inclined plate 401 of the tester with the working side facing up. The sample 400 should be above the inclined plate 401. Measure 100 mm from both ends of the center point of the sample 400 as the test area. Fold the excess part back to the top and bottom of the inclined plate 401 respectively. Then fix the sample 400 with four clips 404. The clips 404 should not obstruct the flow of the solution. Then place the pressure block 405 in the middle area of ​​the upper surface of the sample 400. Adjust the height of the funnel 403 so that the bottom of its opening is 8 mm from the sample surface. Then place a beaker 406 under the tester to collect the solution left after the sample has permeated.

[0061] e. Accurately measure the test solution using a graduated cylinder and pour it into the adjusted funnel 403. Then, quickly open the adjusting door of the funnel 403 to its maximum to allow the solution to flow freely onto the surface of the sample and down the slope into the beaker 406. After the solution has flowed out, close the adjusting door of the funnel 403 and wipe the bottom of the funnel 403 to remove any solution. Measure the amount of solution n in the beaker 406 using a graduated cylinder. If the test solution flows away from the side of the sample, the sample is invalid and another sample should be tested again.

[0062] f. Unit water permeability (m / g) = (volume of solution in beaker n) / (mass of sample m).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 diaper with a surface layer featuring 3D raised dots, characterized in that: The diaper includes a diaper body, defined as extending longitudinally along the length of the diaper body and laterally along the width of the diaper body. The diaper body has a front waist area, a crotch area, and a back waist area distributed sequentially along the longitudinal 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 liquid-permeable top layer includes a hydrophilic nonwoven fabric, a hydrophobic nonwoven fabric disposed on both sides of the hydrophilic nonwoven fabric, and an elastic band. The hydrophilic nonwoven fabric covers the upper surface and both sides of the absorbent core layer. The outer side of the hydrophobic nonwoven fabric is bent upward, and the elastic band is disposed at the free end of the hydrophobic nonwoven fabric to form a leak-proof side. A water-proof area with a width of 3mm to 8mm is heat-pressed between the leak-proof side and the absorbent core layer. The hydrophilic nonwoven fabric has multiple sets of first and second breathable and water-permeable units distributed on it. These units are staggered in the transverse direction. Each first breathable and water-permeable unit includes multiple first 3D protrusions arranged in a row along the longitudinal direction, with a first water-passing channel formed between adjacent first 3D protrusions. Each first 3D protrusion has a first set of air vents. Each second breathable and water-permeable unit includes multiple second 3D protrusions arranged in a row along the longitudinal direction, with a second water-passing channel formed between adjacent second 3D protrusions. The first and second water-passing channels located in the same transverse direction are connected and staggered. The second 3D convex dot is provided with a second group of breathable holes. The first 3D convex dot and the second 3D convex dot are distributed in a rotationally symmetrical manner. The two lateral ends of the first 3D convex dot of the first breathable and water-permeable unit are interlocked with one lateral end of the second 3D convex dot of the adjacent second breathable and water-permeable unit to form a water-blocking area. The first group of breathable holes on the first 3D convex dot and the second group of breathable holes on the second 3D convex dot are located on the same straight line in the same lateral direction. The periphery of the first 3D convex dot and the second 3D convex dot are hot-pressed onto the surface of the absorbent core layer. The hydrophilic nonwoven fabric has a unit water permeability of no more than 18 mL / g measured under a pressure of 3.2 KPa.

2. The diaper with 3D raised dots as described in claim 1, characterized in that: Both the first and second 3D convex points are raised structures, resulting in cavities within them. Both the first and second 3D convex points have a highest point. The first group of vent holes is distributed around the highest point of the first 3D convex point and faces the first water passage. The second group of vent holes is distributed around the highest point of the second 3D convex point and faces the second water passage.

3. The diaper with 3D raised dots as described in claim 2, characterized in that: Both the first and second vent groups include a first through hole and a plurality of second through holes arranged around the first through hole, wherein the diameter of the first through hole is larger than the diameter of the second through hole.

4. The diaper with 3D raised dots as described in claim 1, characterized in that: The two transverse sides of the hydrophilic nonwoven fabric are respectively compositely connected to the middle of the two hydrophobic nonwoven fabrics to form a connection area. The hydrophobic area is distributed in the connection area, and the transverse inner side of the hydrophobic nonwoven fabric is distributed between the absorbent core layer and the liquid-impermeable bottom layer.

5. The diaper with 3D raised dots on the surface layer according to any one of claims 1 to 4, characterized in that: The absorbent core layer includes a first absorber, a second absorber, a third absorber, and a wrapping layer. The second and third absorbers are located below the first absorber and are distributed on both sides of the transverse central axis of the first absorber. The second and third absorbers are respectively connected to the lower surface of the first absorber. There is a gap between the second and third absorbers. The outer transverse sides of the second and third absorbers each have an extension. The wrapping layer covers the outer sides of the first, second, and third absorbers. Through the wrapping layer, the two extensions are folded upward and attached to the two transverse sides of the first absorber.

6. The diaper with 3D raised dots as described in claim 5, characterized in that: The upper surface of the first absorbent has multiple grooves pressed side by side along the longitudinal direction, which correspond to the first air-permeable and water-permeable unit and the second air-permeable and water-permeable unit respectively. The first absorbent includes an upper non-woven fabric, a lower non-woven fabric, and absorbent material disposed between the upper and lower non-woven fabrics. Multiple seepage holes without absorbent material are provided between the upper and lower non-woven fabrics and at the grooves. Each seepage hole is spaced apart along the longitudinal direction of the groove.

7. The diaper with 3D raised dots as described in claim 6, characterized in that: Each groove is filled with first wood pulp fiber. When the periphery of the first 3D stereoscopic protrusion and the second 3D stereoscopic protrusion are hot-pressed onto the surface of the absorbent core layer, part of the first wood pulp fiber fills the cavity of the first 3D stereoscopic protrusion and the second 3D stereoscopic protrusion.

8. The diaper with 3D raised dots as described in claim 7, characterized in that: The space between the second absorber and the third absorber is filled with second wood pulp fibers.

9. The diaper with 3D raised dots as described in claim 8, characterized in that: The inner surface of the leak-proof partition and the transverse outer layer located in the downstream zone are composited with a longitudinal water-guiding layer.

10. The diaper with 3D raised dots on the surface layer according to claim 9, characterized in that: The surface of the longitudinal water guiding layer is pressed with a first water guiding groove and a second water guiding groove in a V-shape, and the first water guiding groove and the second water guiding groove are axially symmetrically distributed along the central axis of the longitudinal water guiding layer.

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