High-diffusion baby diaper and preparation method thereof

Abstract

The present invention relates to the field of disposable sanitary products, in particular to a high-diffusion baby diaper and a preparation method thereof. The prepared baby diaper has the characteristics of good diversion effect and high absorption efficiency. The absorption core layer includes a top non-woven fabric, an intermediate non-woven fabric, a bulky non-woven fabric, a bottom non-woven fabric, a wood pulp fiber layer, a first absorption material layer and a second absorption material layer. The first absorption material layer includes first high-molecular water-absorbing resin particles and first wood pulp fibers, and the second absorption material layer includes second high-molecular water-absorbing resin particles. The second absorption material layer is arranged between the bulky non-woven fabric and the bottom non-woven fabric, and some of the second high-molecular water-absorbing resin particles on the second absorption material layer are embedded in the pores of the bulky non-woven fabric. The first absorption material layer is arranged between the bulky non-woven fabric and the intermediate non-woven fabric, and some of the first high-molecular water-absorbing resin particles on the first absorption material layer are embedded in the pores of the bulky non-woven fabric.

Description

Technical Field

[0001] The present invention relates to the field of disposable sanitary products, in particular to a high-diffusion baby diaper and a preparation method thereof. Background Art

[0002] The structure of diapers is generally as follows: from top to bottom, it includes a liquid-permeable surface layer, an absorbent core layer, and a liquid-impermeable bottom layer. The absorbent core layer is usually a mixture of high-molecular water-absorbent resin particles and wood pulp fibers, and wrapped with non-woven fabric to form a block structure, which is used to absorb and retain human excretions. The liquid-permeable surface layer is composed of hydrophilic non-woven fabric and hydrophobic non-woven fabrics fixed on the two lateral sides of the hydrophilic non-woven fabric, which is used to provide a comfortable and dry feeling when in contact with the body, while allowing liquid to pass freely into the absorbent core layer below. 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 soiling the wearer's pants.

[0003] During use, the single-layer absorption core relies on the natural diffusion of high-molecular water-absorbing resin particles, and urine tends to gather at the contact point to form local saturation, resulting in a decrease in the absorption rate; moreover, the absorption core lacks a three-dimensional diversion structure, and after absorbing a large amount of urine, it is easy to reversely seep to the surface due to pressure, causing skin problems such as diaper rash. Summary of the Invention

[0004] Therefore, in order to solve the above problems, the present invention provides a high-diffusion baby diaper with good diversion effect and high absorption efficiency and a preparation method thereof.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-diffusion baby diaper, comprising a diaper body, wherein the longitudinal direction extending along the length of the diaper body is defined as a longitudinal direction, and the transverse direction extending along the width of the diaper body is defined as a transverse direction. The diaper body comprises a liquid-permeable surface layer, an absorbent core layer, and a liquid-impermeable backing layer stacked in sequence from top to bottom. The diaper body comprises a front waist region and a rear waist region distributed in the longitudinal direction, and a crotch region distributed between the front waist region and the rear waist region. The absorbent core layer comprises a first absorbent region located on one transverse side of a transverse central axis and a second absorbent region located on the other transverse side of the transverse central axis. The absorbent core layer comprises an upper edge and a lower edge distributed at both longitudinal ends, and a left edge and a right edge distributed at both transverse ends.

[0007] The absorbent core layer includes a top non-woven fabric, an intermediate 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, wherein the first absorbent material layer includes first high-molecular water-absorbing resin particles and first wood pulp fibers, the second absorbent material layer includes second high-molecular water-absorbing resin particles, the second absorbent material layer is arranged between the bulky non-woven fabric and the bottom non-woven fabric, and part of the second high-molecular water-absorbing resin particles on the second absorbent material layer are embedded in the pores of the bulky non-woven fabric, the first absorbent material layer is arranged between the bulky non-woven fabric and the intermediate non-woven fabric, and part of the first high-molecular water-absorbing resin particles on the first absorbent material layer are embedded in the pores of the bulky non-woven fabric, and another part of the first high-molecular water-absorbing resin particles and the first wood pulp fibers are mixed and distributed on the upper surface of the bulky non-woven fabric, and the average gram weight of the first high-molecular water-absorbing resin particles of the first absorbent material layer and the average gram weight of the second high-molecular water-absorbing resin particles of the second absorbent material layer are both 0.5g / m² to 35g / m²;

[0008] The first absorption zone of the bulky nonwoven fabric is provided with a first guide zone and a second guide zone along the longitudinal direction, which do not contain the first high molecular water-absorbing resin particles and the second high molecular water-absorbing resin particles. The longitudinal middle of the first guide zone coincides with the longitudinal middle of the second guide zone. The second absorption zone of the bulky nonwoven fabric is provided with a third guide zone and a fourth guide zone along the longitudinal direction, which do not contain the first high molecular water-absorbing resin particles and the second high molecular water-absorbing resin particles. The longitudinal middle of the third guide zone coincides with the longitudinal middle of the fourth guide zone. The middle nonwoven fabric, the bulky nonwoven fabric and the bottom nonwoven fabric are provided at the first guide zone. The flow area, the second guide area, the third guide area and the fourth guide area are compositely connected. When the first high molecular water-absorbent resin particles and the second high molecular water-absorbent resin particles swell, the first guide area and the second guide area of ​​the first absorption area form a first guide groove and a second guide groove, and the third guide area and the third guide area of ​​the second absorption area form a third guide groove and a fourth guide groove. The wood pulp fiber layer is laid on the upper surface of the middle non-woven fabric, and the top non-woven fabric is composited with the upper surface of the wood pulp fiber layer. The absorption core layer has a unit permeability measured under a pressure of 5.2KPa that is not greater than 15mL / g.

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

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

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

[0012] Furthermore, the liquid-permeable surface layer includes a hydrophilic non-woven fabric and a hydrophobic non-woven fabric distributed and fixed on both lateral sides of the hydrophilic non-woven fabric. The hydrophilic non-woven fabric is adhered to the upper surface of the absorbent core layer and the lateral sides of the absorbent core layer, and is adhered to the liquid-impermeable bottom layer with the absorbent core layer. The lateral outer side of the hydrophobic non-woven 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 lateral outer side of the first leak-proof edge. The height dimension of the second leak-proof edge is greater than the height dimension of the first leak-proof edge. The free end of the first leak-proof edge is embedded with a first elastic rubber band, and the free end of the second leak-proof edge is embedded with a second elastic rubber band.

[0013] Furthermore, the height of the first anti-leakage rib is 2 to 3 cm, and the height of the second anti-leakage rib is 4 to 6 cm.

[0014] Furthermore, the front waist area of ​​the diaper body is provided with a front baffle, the two lateral sides of the front baffle are respectively compounded on the upper surface of the first leak-proof baffle, the longitudinal outer side of the front baffle is compounded on the upper surface of the hydrophilic non-woven fabric, and the front baffle covers the longitudinal side of the first guide groove and the third guide groove, and the front waist area of ​​the diaper body is provided with a rear baffle, the two lateral sides of the rear baffle are respectively compounded on the upper surface of the first leak-proof baffle, and the longitudinal outer side of the rear baffle is compounded on the upper surface of the hydrophilic non-woven fabric.

[0015] Furthermore, the average gram weight of the first high molecular water-absorbing resin particles in the first absorbent material layer is less than the average gram weight of the second high molecular water-absorbing resin particles in the second absorbent material layer.

[0016] Furthermore, the water absorption capacity of the second absorbent material layer decreases stepwise from the longitudinal middle portion to the longitudinal ends of the diaper body.

[0017] A method for preparing high-diffusion baby diapers comprises the following steps:

[0018] 1. Prepare a liquid-impermeable base layer;

[0019] 2. Preparation of absorbent core layer:

[0020] 1) The rolled bulky non-woven fabric is unrolled and transported, with the longitudinal direction extending along the transport direction of the bulky non-woven fabric being defined as the longitudinal direction, and the transverse direction extending along the width direction of the bulky non-woven fabric being defined as the transverse direction;

[0021] 2) applying second polymer water-absorbing resin particles to the lower surface of the bulky non-woven fabric via a feed roller, wherein the feed roller has a storage groove for storing the second polymer water-absorbing resin particles, and the storage groove is provided with convex strips;

[0022] 3) unwinding the rolled bottom nonwoven fabric and conveying it, and laminating it to the product in step 2);

[0023] 4) applying first polymer water-absorbing resin particles and first wood pulp fibers in sequence to the upper surface of the bulky nonwoven fabric;

[0024] 5) Unwind the rolled intermediate non-woven fabric and place it on the product from step 4):

[0025] 6) welding the middle non-woven fabric, the bulky non-woven fabric, and the bottom non-woven fabric along the area where the first polymer water-absorbing resin particles and the second polymer water-absorbing resin particles are not applied using an ultrasonic welding device;

[0026] 7) applying a layer of wood pulp fibers to the upper surface of the article of step 6);

[0027] 8) unwinding the rolled top nonwoven fabric and laminating it onto the product from step 7);

[0028] 3. Preparation of liquid-permeable surface layer:

[0029] 9) Unrolling and conveying the rolled hydrophilic nonwoven fabric;

[0030] 10) unwinding and conveying the rolled hydrophobic non-woven fabric, and cutting it into a left hydrophobic non-woven fabric and a right hydrophobic non-woven fabric;

[0031] 11) Laminating the first elastic band and the second elastic band to the left hydrophobic non-woven fabric and the right hydrophobic non-woven fabric respectively;

[0032] 12) Folding the left hydrophobic non-woven fabric and the right hydrophobic non-woven fabric respectively using a folding plate to form a first leak-proof rib and a second leak-proof rib;

[0033] 4. The liquid-impermeable bottom layer, the absorbent core layer and the liquid-permeable surface layer are laminated and connected in sequence from bottom to top;

[0034] 5. Cut the product from step 4 into individual diaper bodies.

[0035] By adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the high-diffusion baby diaper and its preparation method, by setting the first absorption zone and the second absorption zone, and adopting a multi-layer material combination with a specific structure in the absorption core layer, including distributing the first high-molecular water-absorbent resin particles and the second high-molecular water-absorbent resin particles in different ways in relevant positions of the bulky non-woven fabric, and at the same time setting a diversion zone without high-molecular water-absorbent resin particles in different absorption zones of the bulky non-woven fabric, so that when urine comes into contact with it, it can be quickly dispersed to a larger range with the help of the special structure of the bulky non-woven fabric and the design of the diversion zone, avoiding local saturation and improving the absorption efficiency. Specifically, urine enters the wood pulp fiber layer through the liquid-permeable surface layer and the top non-woven fabric, and the capillary pressure difference of the wood pulp fibers in the wood pulp fiber layer is used to form a "pulling effect", so that the urine comes into contact with After touching the surface layer, it is quickly introduced into the inner layer, and through the bulky setting of the wood pulp fibers in the wood pulp fiber layer, lateral diversion and infiltration are achieved. Part of the urine is absorbed and fixed by the first absorbent material layer, and the other part is guided and infiltrated in the lateral and longitudinal directions through the first diversion groove, the second diversion groove, the third diversion groove and the fourth diversion groove, and then absorbed by the second absorbent material layer. The bulky non-woven fabric can fix the first polymer water-absorbent resin particles and the second polymer water-absorbent resin particles to prevent aggregation, and provide a larger expansion space by combining with the first wood pulp fibers, thereby improving the absorption efficiency of the polymer water-absorbent resin particles; and when the polymer water-absorbent resin particles swell, a diversion groove is formed, which further enhances the diversion effect, effectively reduces urine back osmosis, reduces the risk of causing skin problems such as diaper rash, and improves the overall performance of the diaper. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0037] Figure 2 1 is a schematic diagram of the top view of the diaper body in the unfolded state according to an embodiment of the present invention;

[0038] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0039] Figure 4 1 is a schematic diagram of a top view of the bulky nonwoven fabric in an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the three-dimensional structure of the blanking roller in an embodiment of the present invention;

[0041] Figure 6 3D is a schematic diagram of the three-dimensional structure of the tester in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0043] The embodiments of the present invention are:

[0044] refer to Figures 1 to 4 As shown, a high-diffusion baby diaper includes a diaper body 1, wherein the longitudinal direction is defined as the length direction of the diaper body 1, and the transverse direction is defined as the width direction of the diaper body 1. The diaper body 1 includes a liquid-permeable surface layer 11, an absorbent core layer 12, and a liquid-impermeable bottom layer 13 stacked in sequence from top to bottom. The diaper body 1 has a front waist region 101 and a rear waist region 102 distributed in the longitudinal direction, and a crotch region 103 distributed between the front waist region 101 and the rear waist region 102. The absorbent core layer 12 has a first absorbent region 100 located on one transverse side of the transverse central axis and a second absorbent region 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 longitudinal ends, and a left edge 203 and a right edge 204 distributed at both transverse ends.

[0045] The absorbent core layer 12 comprises a top non-woven fabric 121, an intermediate non-woven fabric 122, a bulky non-woven fabric 123, a bottom non-woven fabric 124, a wood pulp fiber layer 125, a first absorbent material layer 126 and a second absorbent material layer 127, wherein the first absorbent material layer 126 comprises first polymer water-absorbing resin particles and first wood pulp fibers, the second absorbent material layer 127 comprises second polymer water-absorbing resin particles, the second absorbent material layer 127 is arranged between the bulky non-woven fabric 123 and the bottom non-woven fabric 124, and part of the second polymer water-absorbing resin particles on the second absorbent material layer 127 are embedded in the bulky non-woven fabric 123 and the bottom non-woven fabric 124. The first absorbent material layer 126 is disposed within the pores of the non-woven fabric 123 between the bulky non-woven fabric 123 and the intermediate non-woven fabric 122. A portion of the first polymer water-absorbing resin particles on the first absorbent material layer 126 are embedded in the pores of the bulky non-woven fabric 123, while another portion of the first polymer water-absorbing resin particles is mixed with first wood pulp fibers and distributed on the upper surface of the bulky non-woven fabric 123. The average gram weight of the first polymer water-absorbing resin particles in the first absorbent material layer 126 and the average gram weight of the second polymer water-absorbing resin particles in the second absorbent material layer 127 are both 0.5 g / m² to 35 g / m².

[0046] The first absorption zone 100 of the bulky nonwoven fabric 123 is provided with a first guide zone 301 and a second guide zone 302 along the longitudinal direction, which do not contain the first high molecular water-absorbing resin particles and the second high molecular water-absorbing resin particles. The longitudinal middle part of the first guide zone 301 coincides with the longitudinal middle part of the second guide zone 302. The second absorption zone 200 of the bulky nonwoven fabric 123 is provided with a third guide zone 303 and a fourth guide zone 304 along the longitudinal direction, which do not contain the first high molecular water-absorbing resin particles and the second high molecular water-absorbing resin particles. The longitudinal middle part of the third guide zone 303 coincides with the longitudinal middle part of the fourth guide zone 304. The intermediate nonwoven fabric 122 and the bulky nonwoven fabric 123 The bottom non-woven fabric 124 is compositely connected at the first guide area 301, the second guide area 302, the third guide area 303 and the fourth guide area 304. When the first high molecular water-absorbent resin particles and the second high molecular water-absorbent resin particles swell, the first guide area 301 and the second guide area 302 of the first absorption area 100 form a first guide groove 401 and a second guide groove 402, and the third guide area 303 and the third guide area 304 of the second absorption area 200 form a third guide groove 403 and a fourth guide groove 404. The wood pulp fiber layer 125 is laid on the upper surface of the middle non-woven fabric 122, and the top non-woven fabric 121 is composited with the upper surface of the wood pulp fiber layer 125.

[0047] The top non-woven fabric 121 and the wood pulp fiber layer 125 are pressed with a matrix-distributed concave hole structure 2 to increase the infiltration speed of urine and thus increase the absorption speed.

[0048] The high-diffusion baby diaper is provided with a first absorption zone 100 and a second absorption zone 200, and a multi-layer material combination with a specific structure is adopted in the absorption core layer 12, including distributing the first high-molecular water-absorbent resin particles and the second high-molecular water-absorbent resin particles in relevant positions of the bulky non-woven fabric 123 in different ways, and at the same time providing a diversion zone without high-molecular water-absorbent resin particles in different absorption zones of the bulky non-woven fabric 123, so that when urine comes into contact with the diaper, the special structure of the bulky non-woven fabric and the design of the diversion zone can quickly disperse the urine to a larger range, avoid local saturation, and improve the absorption efficiency. Specifically, urine enters the wood pulp fiber layer 125 through the liquid-permeable surface layer 11 and the top non-woven fabric, and the capillary pressure difference of the wood pulp fibers in the wood pulp fiber layer 125 is used to form a "pulling effect", so that the urine is quickly introduced into the inner layer after contacting the surface layer, and is passed through the inner layer. The wood pulp fibers in the wood pulp fiber layer 125 are bulky to achieve lateral diversion and infiltration. Part of the urine is absorbed and fixed by the first absorbent material layer 126, and the other part is diverted and infiltrated in the lateral and longitudinal directions through the first diversion groove 401, the second diversion groove 402, the third diversion groove 403 and the fourth diversion groove 404, and then absorbed by the second absorbent material layer 127. The bulky non-woven fabric 123 can fix the first polymer water-absorbent resin particles and the second polymer water-absorbent resin particles to prevent aggregation, and provide a larger expansion space by combining with the first wood pulp fibers, thereby improving the absorption efficiency of the polymer water-absorbent resin particles; and when the polymer water-absorbent resin particles swell, a diversion groove is formed, which further enhances the diversion effect, effectively reduces urine back osmosis, reduces the risk of causing skin problems such as diaper rash, and improves the overall performance of the diaper.

[0049] Specifically, the second guide groove 402 is distributed on the transverse outer side of the first guide groove 401, the longitudinal ends of the first guide groove are not connected to the upper edge 201 and the lower edge 202, the second guide groove 402 has an arc-shaped structure, and the longitudinal ends of the second guide groove 402 are respectively connected to the left edge 203, the fourth guide groove 404 is distributed on the transverse outer side of the third guide groove 403, the longitudinal ends of the third guide groove 403 are not connected to the upper edge 201 and the lower edge 202, and the fourth guide groove 404 has an arc-shaped structure. The longitudinal ends of the fourth guide groove 404 are respectively connected to the right edge 204, the second guide groove 402 is distributed on the transverse outside of the first guide groove 401 and has an arc-shaped structure, and the fourth guide groove 404 is distributed on the transverse outside of the third guide groove 403 and has an arc-shaped structure. This design fits the baby's body curve better, and can better guide the urine to diffuse along a specific path during the urine absorption process, making the urine distribution more even, further improving the absorption efficiency and diversion effect. At the same time, the arc-shaped structure helps to reduce friction on the baby's skin and improve wearing comfort.

[0050] In addition, the longitudinal ends of the first guide groove 401 and the third guide groove 403 extend into the front waist area 101 and the back waist area 102 respectively. This design allows urine to be more widely diffused to the front and back areas of the diaper during the absorption process, making full use of the overall absorption space of the diaper, avoiding urine concentration in the crotch area, further improving the absorption capacity and absorption efficiency, and reducing problems such as side leakage caused by local absorption saturation.

[0051] Furthermore, the second guide groove 402 and the fourth guide groove 404 are distributed in the crotch area 103. The crotch is the place where urine is most likely to concentrate. The guide grooves are set in this area to quickly disperse the urine concentrated there, prevent urine from accumulating in the crotch, effectively reduce the absorption pressure in the crotch area, improve the absorption and diversion performance of this key part, reduce the risk of urine back-seeping to the surface, and better protect the baby's skin.

[0052] It is worth noting that the first guide groove 401 and the third guide groove 403 and the lower side of the bulky non-woven fabric 123 are filled with the second wood pulp fiber 3, and the second wood pulp fiber 3 is not compositely connected to the liquid-impermeable bottom layer 13. The first guide groove 401 and the third guide groove 403 and the lower side of the bulky non-woven fabric 123 are filled with the second wood pulp fiber 3, and the second wood pulp fiber 3 is not compositely connected to the liquid-impermeable bottom layer 13. The second wood pulp fiber 3 can absorb a certain amount of urine and play a role in auxiliary absorption. At the same time, it is not compositely connected to the liquid-impermeable bottom layer 13, so that the absorbed urine can diffuse more smoothly inside the diaper and be absorbed by other absorbent layers, further enhancing the absorption capacity and diversion effect of the diaper.

[0053] In this embodiment, the liquid-permeable surface layer 11 includes a hydrophilic non-woven fabric 111 and a hydrophobic non-woven fabric 112 distributed and fixed on both sides of the hydrophilic non-woven fabric 111. The hydrophilic non-woven fabric 111 is adhered to the upper surface of the absorbent core layer 12 and the two lateral sides of the absorbent core layer 12, and is adhered to the liquid-impermeable bottom layer 13 with the absorbent core layer 12. The lateral outer side of the hydrophobic non-woven fabric 122 is 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 lateral outer side of the first leak-proof edge 4. The height of the second leak-proof edge 5 is greater than the height of the first leak-proof edge 4. The free end of the first leak-proof edge 4 A first elastic rubber band 6 is embedded in it, and a second elastic rubber band 7 is embedded in the free end of the second leak-proof sidewall 5. The liquid-permeable surface layer 11 adopts a hydrophilic non-woven fabric 111 adhered to the relevant surface of the absorption core layer 12 and adhered to the liquid-impermeable bottom layer 13 with the absorption core layer 12, ensuring good liquid permeability, so that urine can quickly pass through the surface layer into the absorption core layer 12; the hydrophobic non-woven fabric 122 is folded to form a first leak-proof sidewall 4 and a second leak-proof sidewall 5 of different heights, and an elastic rubber band is embedded in it, which can effectively prevent urine from leaking sideways, and the sidewall design of different heights can provide targeted protection according to the leakage prevention needs of different parts of the baby's body, thereby improving the reliability and comprehensiveness of leakage prevention.

[0054] In addition, the height of the first leak-proof rib 4 is 2 to 3 cm, preferably 3 cm, and the height of the second leak-proof rib 5 is 4 to 6 cm, preferably 5 cm. This specific size range is optimized based on the baby's physical characteristics and actual usage needs. It can not only ensure a good leak-proof effect, but also will not affect the baby's activity comfort due to the rib being too high, thus achieving a good balance between leak-proof performance and wearing comfort.

[0055] At the same time, the front waist area 101 of the diaper body 1 is provided with a front baffle 8, the lateral sides of the front baffle 8 are respectively compounded on the upper surface of the first leak-proof rib 4, the longitudinal outer side of the front baffle 8 is compounded on the upper surface of the hydrophilic non-woven fabric 111, the front baffle 8 covers the longitudinal side of the first guide groove 401 and the third guide groove 403, and the front waist area 101 of the diaper body 1 is provided with a rear baffle 9, the lateral sides of the rear baffle 9 are respectively compounded on the upper surface of the first leak-proof rib 4, the longitudinal outer side of the rear baffle 9 is compounded on the hydrophilic non-woven fabric 111 On the upper surface, the longitudinal width of the front baffle 8 is greater than the longitudinal width of the rear baffle 9. The front baffle 8 is set in the front waist area 101 and the rear baffle 9 is set in the rear waist area 102, and the front baffle 8 covers the longitudinal side of the first guide groove 401 and the third guide groove 403, which can further prevent urine from overflowing from the longitudinal side of the guide groove, enhance the leakage-proof performance of the diaper in the front and back waist areas, and at the same time, the composite connection method of the baffle, the first leakage-proof edge and the hydrophilic non-woven fabric ensures the stability of the baffle, makes it not easy to shift during the baby's activities, and effectively improves the overall leakage-proof effect of the diaper.

[0056] Furthermore, the average gram weight of the first polymer water-absorbing resin particles of the first absorbent material layer 126 is less than the average gram weight of the second polymer water-absorbing resin particles of the second absorbent material layer 127. This differentiated design enables different absorbent layers to play different roles in absorbing urine. The first absorbent material layer 126 can quickly absorb and initially disperse urine, while the second absorbent material layer 127 has a stronger absorption and water-locking ability due to its higher gram weight of polymer water-absorbing resin particles, and can better cope with large amounts of urine, improve the overall absorption efficiency and absorption capacity, and at the same time reasonably allocate the resources of the absorption layer to optimize the absorption performance.

[0057] Furthermore, the water absorption capacity of the second absorbent material layer 127 decreases in a stepped manner from the longitudinal middle part to the longitudinal ends of the diaper body 1, which is in line with the distribution law of urine on the diaper. The longitudinal middle part is usually the area where urine first contacts and the amount is large. Setting a higher water absorption capacity can quickly absorb a large amount of urine, while the water absorption capacity gradually decreases towards the two ends, which can not only ensure the uniformity of overall absorption, but also reasonably utilize the absorption layer material, avoid material waste, and improve the use efficiency and economy of the diaper.

[0058] refer to Figure 5 A method for preparing a high-diffusion baby diaper is shown, comprising the following steps:

[0059] 1. Prepare a liquid-impermeable bottom layer 13;

[0060] 2. Preparation of the Absorbent Core Layer 12:

[0061] 1) unwinding and conveying the rolled bulky nonwoven fabric, wherein the direction extending along the conveying direction of the bulky nonwoven fabric 123 is defined as the longitudinal direction, and the direction extending along the width direction of the bulky nonwoven fabric 123 is defined as the transverse direction;

[0062] 2) applying second polymer water-absorbing resin particles to the lower surface of the bulky non-woven fabric 123 via a feed roller 600 , wherein the feed roller 600 has a storage trough 601 for storing the second polymer water-absorbing resin particles, and a ridge 602 is provided in the storage trough 601 ;

[0063] 3) unwinding and conveying the rolled bottom nonwoven fabric 124 and laminating it onto the product of step 2);

[0064] 4) applying first polymer water-absorbing resin particles and first wood pulp fibers in sequence to the upper surface of the bulky nonwoven fabric 123;

[0065] 5) Unwind the rolled intermediate non-woven fabric 122 and place it on the product from step 4):

[0066] 6) Using an ultrasonic welding device, the middle non-woven fabric 122, the bulky non-woven fabric 123, and the bottom non-woven fabric 124 are welded and fixed along the areas where the first polymer water-absorbing resin particles and the second polymer water-absorbing resin particles are not applied;

[0067] 7) applying a layer of wood pulp fibers to the upper surface of the product of step 6) to form a wood pulp fiber layer 125;

[0068] 8) unwinding and conveying the rolled top nonwoven fabric 121 and laminating it onto the product from step 7);

[0069] 3. Preparation of liquid-permeable surface layer 11:

[0070] 9) unwinding and conveying the rolled hydrophilic nonwoven fabric 111;

[0071] 10) unwinding and conveying the rolled hydrophobic nonwoven fabric 112 and cutting it into a left hydrophobic nonwoven fabric and a right hydrophobic nonwoven fabric;

[0072] 11) Laminating the first elastic band 6 and the second elastic band 7 onto the left and right hydrophobic non-woven fabrics, respectively;

[0073] 12) Folding the left and right hydrophobic non-woven fabrics respectively using a folding plate to form a first leak-proof rib 4 and a second leak-proof rib 5;

[0074] 4. The liquid-impermeable bottom layer 13, the absorbent core layer 12 and the liquid-permeable surface layer 11 are laminated and connected in sequence from bottom to top;

[0075] 5. Cut the product from step 4 into individual diaper bodies.

[0076] This method for preparing high-diffusion baby diapers adopts the method of unwinding and conveying rolled materials for production. The various steps are closely connected, and continuous production can be achieved. This production method greatly improves production efficiency, reduces production costs, and is conducive to large-scale industrial production. In addition, by precisely controlling the process parameters such as unwinding, applying, compounding, and welding of the materials in each step, the stability and consistency of product quality can be guaranteed.

[0077] In this embodiment, the absorbent core layer 12 has a unit permeability measured at a pressure of 5.2 KPa that is no greater than 15 mL / g.

[0078] refer to Figure 6 Prepare the instrument as shown:

[0079] Balance: accuracy 0.01g;

[0080] A tester 501 includes an upper panel 502 and a lower panel 503 , wherein one edge of the upper panel 502 is hingedly connected to one edge of the lower panel 503 :

[0081] Funnel 504: 150 mL;

[0082] Graduated cylinder: 100mL and 10mL;

[0083] Stainless steel clip 505;

[0084] Beaker: 500 mL;

[0085] Compact block 506: diameter 100 mm, mass 5.2 ± 0.002 kg;

[0086] Stopwatch: accuracy 0.01s;

[0087] 0.9% sodium chloride solution: Add 9.0g of sodium chloride to 1000mL of distilled water to prepare a solution.

[0088] Testing steps:

[0089] a. Prepare 7 absorbent core layers as samples. After testing, remove the maximum and minimum values ​​of the 7 test results and take the arithmetic average of the remaining 5 as the final test result, accurate to 1mL;

[0090] b. Measure the mass m of each sample using a balance;

[0091] c. First, place the tester in a horizontal position and adjust the angle between the upper and lower panels to 30°±2°. Then adjust the lower opening of the funnel so that the center of the projection is 200±2mm from the lower edge of the tester's inclined panel. The opening of the lower opening of the funnel faces the operator. Pour an appropriate amount of test solution into the funnel to wet the funnel, and rinse the funnel twice with the test solution.

[0092] d. Take a sample to be tested and place it flat on the inclined plate of the tester, with the surface facing up and the back of the sample above the inclined plate. Measure 100mm from each end of the center point of the sample as the test area. Fold the overhanging part back to the top and bottom of the inclined plate respectively. Secure the sample with four stainless steel clips. The stainless steel clips must not hinder the flow of the solution. Then place the pressing block in the middle area of ​​the upper surface of the sample. Adjust the height of the funnel so that the bottom end of its lower opening is 8mm from the sample surface. Then place a beaker under the tester to collect the solution left after the sample penetrates.

[0093] e. Accurately measure the test solution with a graduated cylinder and pour it into the adjusted funnel. Then quickly open the funnel adjustment door to the maximum, allowing the solution to flow freely on the surface of the sample and flow down the slope into the beaker. After the solution has flowed out, close the funnel adjustment door and wipe the bottom of the funnel to make sure there is no solution. Use a graduated cylinder to measure the amount of solution in the beaker (n). If the test solution flows away from the side of the sample, the sample is invalid and another one is taken for retesting.

[0094] f. Unit permeability (m / g) = (amount of solution in the beaker n) / (mass of the sample m).

[0095] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0096] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0097] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0098] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A high-diffusion baby diaper, characterized by: The invention comprises a diaper body, wherein the longitudinal direction is defined as extending along the length direction of the diaper body, and the transverse direction is defined as extending along the width direction of the diaper body. The diaper body comprises a liquid-permeable surface layer, an absorbent core layer, and a liquid-impermeable bottom layer stacked in sequence from top to bottom. The diaper body comprises a front waist region and a back waist region distributed in the longitudinal direction, and a crotch region distributed between the front waist region and the back waist region. The absorbent core layer comprises a first absorbent region located on one transverse side of a transverse central axis and a second absorbent region located on the other transverse side of the transverse central axis. The absorbent core layer comprises an upper edge and a lower edge distributed at both longitudinal ends, and a left edge and a right edge distributed at both transverse ends. 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 high-molecular water-absorbing resin particles and first wood pulp fibers. The second absorbent material layer includes second high-molecular water-absorbing resin particles. The second absorbent material layer is arranged between the bulky non-woven fabric and the bottom non-woven fabric, and part of the second high-molecular water-absorbing resin particles on the second absorbent material layer is embedded in the pores of the bulky non-woven fabric. The first absorbent material layer is arranged between the bulky non-woven fabric and the middle non-woven fabric. Part of the first polymer water-absorbing resin particles on the first absorbent material layer are embedded in the pores of the bulky non-woven fabric, and another part of the first polymer water-absorbing resin particles are mixed with the first wood pulp fibers and distributed on the upper surface of the bulky non-woven fabric. The average gram weight of the first polymer water-absorbing resin particles in the first absorbent material layer and the average gram weight of the second polymer water-absorbing resin particles in the second absorbent material layer are both 0.5 g / m² to 35 g / m², and the average gram weight of the first polymer water-absorbing resin particles in the first absorbent material layer is less than the average gram weight of the second polymer water-absorbing resin particles in the second absorbent material layer. The first absorption zone of the bulky nonwoven fabric is provided with a first guide zone and a second guide zone along the longitudinal direction, which do not contain the first high molecular water-absorbing resin particles and the second high molecular water-absorbing resin particles. The longitudinal middle of the first guide zone coincides with the longitudinal middle of the second guide zone. The second absorption zone of the bulky nonwoven fabric is provided with a third guide zone and a fourth guide zone along the longitudinal direction, which do not contain the first high molecular water-absorbing resin particles and the second high molecular water-absorbing resin particles. The longitudinal middle of the third guide zone coincides with the longitudinal middle of the fourth guide zone. The middle nonwoven fabric, the bulky nonwoven fabric and the bottom nonwoven fabric are provided at the first guide zone. The flow area, the second guide area, the third guide area and the fourth guide area are compositely connected. When the first high molecular water-absorbent resin particles and the second high molecular water-absorbent resin particles swell, the first guide area and the second guide area of ​​the first absorption area form a first guide groove and a second guide groove, and the third guide area and the third guide area of ​​the second absorption area form a third guide groove and a fourth guide groove. The wood pulp fiber layer is laid on the upper surface of the middle non-woven fabric, and the top non-woven fabric is composited with the upper surface of the wood pulp fiber layer. The absorption core layer has a unit permeability measured under a pressure of 5.2KPa that is not greater than 15mL / g.

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

3. The high-diffusion baby diaper according to claim 2, characterized in that: The longitudinal ends of the first guide groove and the third guide groove extend into the front waist area and the back waist area respectively.

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

5. The high-diffusion baby diaper according to any one of claims 1 to 4, characterized in that: The liquid-permeable surface layer includes a hydrophilic non-woven fabric and a hydrophobic non-woven fabric distributed and fixed on both lateral sides of the hydrophilic non-woven fabric. The hydrophilic non-woven fabric is adhered to the upper surface of the absorbent core layer and the lateral sides of the absorbent core layer, and is adhered to the liquid-impermeable bottom layer together with the absorbent core layer. The lateral outer side of the hydrophobic non-woven 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 lateral outer side of the first leak-proof edge. The height dimension of the second leak-proof edge is greater than the height dimension of the first leak-proof edge. The free end of the first leak-proof edge is embedded with a first elastic rubber band, and the free end of the second leak-proof edge is embedded with a second elastic rubber band.

6. The high-diffusion baby diaper according to claim 5, characterized in that: The height of the first leak-proof rib is 2 to 3 cm, and the height of the second leak-proof rib is 4 to 6 cm.

7. The high-diffusion baby diaper according to claim 6, characterized in that: The front waist area of ​​the diaper body is provided with a front baffle, the two lateral sides of the front baffle are respectively compounded on the upper surface of the first leak-proof rib, the longitudinal outer side of the front baffle is compounded on the upper surface of the hydrophilic non-woven fabric, and the front baffle covers the longitudinal side of the first guide groove and the third guide groove. The front waist area of ​​the diaper body is provided with a rear baffle, the two lateral sides of the rear baffle are respectively compounded on the upper surface of the first leak-proof rib, and the longitudinal outer side of the rear baffle is compounded on the upper surface of the hydrophilic non-woven fabric.

8. The high-diffusion baby diaper according to claim 7, characterized in that: The water absorption capacity of the second absorbent material layer decreases stepwise from the longitudinal middle portion to the longitudinal ends of the diaper body.

9. A method for preparing the high-diffusion baby diaper according to claim 1, characterized in that: The following steps are involved:

1. Prepare a liquid-impermeable base layer; 2. Preparation of absorbent core layer: 1) The rolled bulky non-woven fabric is unrolled and transported, with the longitudinal direction extending along the transport direction of the bulky non-woven fabric being defined as the longitudinal direction, and the transverse direction extending along the width direction of the bulky non-woven fabric being defined as the transverse direction; 2) applying second polymer water-absorbing resin particles to the lower surface of the bulky non-woven fabric via a feed roller, wherein the feed roller has a storage groove for storing the second polymer water-absorbing resin particles, and the storage groove is provided with convex strips; 3) unwinding the rolled bottom nonwoven fabric and conveying it, and laminating it to the product in step 2); 4) applying first polymer water-absorbing resin particles and first wood pulp fibers in sequence to the upper surface of the bulky nonwoven fabric; 5) Unwind the rolled intermediate non-woven fabric and place it on the product from step 4): 6) welding the middle non-woven fabric, the bulky non-woven fabric, and the bottom non-woven fabric along the area where the first polymer water-absorbing resin particles and the second polymer water-absorbing resin particles are not applied using an ultrasonic welding device; 7) applying a layer of wood pulp fibers to the upper surface of the article of step 6); 8) unwinding the rolled top nonwoven fabric and laminating it onto the product from step 7); 3. Preparation of liquid-permeable surface layer: 9) Unrolling and conveying the rolled hydrophilic nonwoven fabric; 10) unwinding the rolled hydrophobic non-woven fabric and conveying it, and cutting it into a left hydrophobic non-woven fabric and a right hydrophobic non-woven fabric; 11) Laminating the first elastic band and the second elastic band to the left hydrophobic non-woven fabric and the right hydrophobic non-woven fabric respectively; 12) Folding the left hydrophobic non-woven fabric and the right hydrophobic non-woven fabric respectively using a folding plate to form a first leak-proof rib and a second leak-proof rib; 4. The liquid-impermeable bottom layer, the absorbent core layer and the liquid-permeable surface layer are laminated and connected in sequence from bottom to top; 5. Cut the product from step 4 into individual diaper bodies.

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