Composite core diaper and preparation method thereof

Abstract

The present invention relates to the field of disposable sanitary products, and in particular to a composite core diaper and a preparation method thereof, which mainly solves the problem of low diffusion efficiency of diapers in the prior art, and comprises a diaper body, a longitudinal direction extending along the length direction of the diaper body, and a transverse direction extending along the width direction of the diaper body, wherein the diaper body has a front waist area, a crotch area and a back waist area sequentially distributed along the longitudinal direction, and the diaper body comprises a liquid-permeable surface layer, a guide layer, an absorbent core layer and a liquid-impermeable bottom layer sequentially stacked from top to bottom; the absorbent core layer comprises an upper non-woven fabric, a middle non-woven fabric, a lower non-woven fabric, at least three upper absorbent bodies and a lower absorbent body.

Description

Technical Field

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

[0002] In the prior art, there are care diapers, which have a care layer with skin care function added to their structure or anti-allergic care drugs added to the core or surface structure, thereby reducing the damage of urine and other excreta to the user's skin, while continuously providing care effects to the user's skin, ensuring that the user can have a comfortable wearing experience for a longer period of time. However, this type of diaper does not have a technical solution that fully takes into account the two different functions of how to make the surface structure and the drug selection better coordinate to bring about better care effects, which affects the product's absorption performance and dryness performance. Therefore, the existing care diapers actually still have a lot of room for performance improvement.

[0003] Authorization announcement number CN114392058B discloses a nursing dry diaper, which is arranged from top to bottom as a nursing surface layer, a guide layer, a composite absorbent core and a bottom layer, wherein the nursing surface layer is made of a surface non-woven fabric that is completely impregnated with a plant care solution, sprayed, scraped, directly mixed and then dried, and the guide layer is made of a diffusion water-conducting fiber layer and a floc-shaped elastic fiber layer. After the elastic fiber layer is matched, at least one side of the guide layer is distributed with an immovable cavity group, and the surface of the nursing surface layer is provided with a cavity group that is connected to the cavity. The invention relates to a group of non-movable pompoms that are coordinated in groups. The care surface layer and the guide layer are connected to each other in a mesh-like manner by a water-soluble care liquid line body. The composite absorbent core body is divided into three layers of non-woven fabrics, each of which is sandwiched with a water-absorbent polymer material. The water-soluble care liquid line body is formed by filling a straw made of a water-soluble material with a plant care liquid and then segmenting it in the form of links. The diameter of the water-soluble care liquid line body does not exceed 2.5 mm, and the inner diameter does not exceed 1.5 mm, and the links completely divide the inner cavity of the water-soluble care liquid line body.

[0004] However, during use, it was found that the composite absorbent core is composed of three layers of non-woven fabric, each of which is sandwiched with a water-absorbent polymer material. The water-absorbent polymer material absorbs water quickly and swells after absorbing the liquid, increasing its volume to more than ten times its original volume. As a result, the water-absorbent polymer material in the upper part easily hinders the infiltration of the liquid after absorbing the liquid first and swelling, seriously affecting the water absorption efficiency. Summary of the invention

[0005] Therefore, in view of the above problems, the present invention provides a composite core diaper and a preparation method thereof, which mainly solves the problem of low diffusion efficiency of diapers in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite core diaper, comprising a diaper body, a longitudinal direction extending along the length direction of the diaper body, and a transverse direction extending along the width direction of the diaper body, wherein the diaper body has a front waist region, a crotch region and a back waist region sequentially distributed along the longitudinal direction, and the diaper body comprises a liquid permeable surface layer, a guide layer, an absorbent core layer and a liquid impermeable bottom layer sequentially stacked from top to bottom;

[0008] The absorbent core layer comprises an upper nonwoven fabric, a middle nonwoven fabric, a lower nonwoven fabric, at least three upper absorbent bodies and a lower absorbent body;

[0009] The lower absorbent body is arranged on the lower non-woven fabric, the lower absorbent body comprises 60% to 70% by weight of high molecular water-absorbing resin particles and 30% to 40% by weight of wood pulp fibers, at least two guide areas are arranged on the lower absorbent body in a transverse direction, the peripheral side of each guide area forms an absorption area, each guide area penetrates the lower absorbent body in a longitudinal direction, the gram weight of the high molecular water-absorbing resin particles located in the guide area on the lower absorbent body is less than the gram weight of the high molecular water-absorbing resin particles located in the absorption area on the lower absorbent body, at least one group of guide components is arranged on the lower absorbent body at the guide area, the guide component comprises a plurality of through grooves arranged in a longitudinal direction, each through groove is distributed in the longitudinal direction, and the longitudinal length dimension of each through groove is 15 mm to 40 mm, the middle non-woven fabric is arranged on the lower absorbent body, the lower non-woven fabric is recessed inward at the through groove and covers the side wall of the through groove, and is bonded and connected with the middle non-woven fabric;

[0010] Each of the upper absorbent bodies is arranged on the middle layer of non-woven fabric at intervals along the lateral direction. The upper absorbent bodies include 20% to 30% by weight of high molecular water-absorbing resin particles and 70% to 80% by weight of wood pulp fibers. A gap is formed between two adjacent upper absorbent bodies. The orthographic projection area of ​​the gap coincides with the orthographic projection area of ​​the guide area. The upper layer of non-woven fabric is arranged on the upper absorbent body. The upper layer of non-woven fabric is recessed inwardly at the gap and covers the side wall of the upper absorbent body, and is bonded and connected to the middle layer of non-woven fabric to form a guide groove.

[0011] Furthermore, two groups of flow guide components are provided on the lower absorbent body at the flow guide area, the two groups of flow guide components are spaced apart in the transverse direction, and the through grooves on each of the flow guide components are staggered.

[0012] Furthermore, the spacing between two adjacent through grooves on the same group of guide components is smaller than the longitudinal length of the through grooves, so that the two groups of guide components have overlapping areas in the transverse direction.

[0013] Furthermore, the ratio of the longitudinal length dimension of the overlapping areas of the through slots to the longitudinal length dimension of the through slots is 1 to 4:10.

[0014] Furthermore, the side wall of the through groove has a permeable area without polymer water-absorbing resin particles, and the width of the permeable area is 3 mm to 7 mm.

[0015] Furthermore, the guide layer includes a first hydrophilic non-woven fabric, a second hydrophilic non-woven fabric, and at least 90% by weight of hydrophilic fibers sandwiched between the first hydrophilic non-woven fabric and the second hydrophilic non-woven fabric. When the absorbent core layer absorbs water and expands, the guide layer located at the guide groove is recessed in the guide groove.

[0016] Furthermore, the transverse width of each through groove is 8 mm to 12 mm.

[0017] Furthermore, the lateral width of the lower nonwoven fabric is 15 mm to 30 mm greater than that of the upper nonwoven fabric, and the lateral sides of the lower nonwoven fabric are folded upward and inward and attached to the upper surface of the upper nonwoven fabric.

[0018] Furthermore, the liquid-permeable surface layer includes a third hydrophilic non-woven fabric, hydrophobic non-woven fabrics distributed on both lateral sides of the third hydrophilic non-woven fabric, and leg elastic bands arranged on the free ends of the hydrophobic non-woven fabric.

[0019] A method for preparing a composite core diaper, used for preparing the composite core diaper, is characterized in that it comprises the following steps:

[0020] (1) preparing a liquid-permeable surface layer;

[0021] (2) preparing a flow-guiding layer;

[0022] (3) Preparation of absorbent core layer:

[0023] a. Unroll the rolled lower non-woven fabric and apply glue to the upper surface of the lower non-woven fabric. Define the conveying direction of the lower non-woven fabric as the longitudinal direction and the width direction as the transverse direction:

[0024] b. The polymer water-absorbent resin particles and the wood pulp fibers are mixed and conveyed by negative pressure adsorption through the first feed bin and deposited in the first mold cavity of the first molding die wheel. The first mold cavity is provided with a first convex strip corresponding to the through groove, so that the lower absorbent body is formed in the first mold cavity of the first molding die wheel, and then the lower absorbent body is transferred to the upper surface of the lower non-woven fabric;

[0025] c. unwinding the rolled middle nonwoven fabric for transportation, applying glue to the lower surface of the middle nonwoven fabric, and then laminating the middle nonwoven fabric on the product in step b;

[0026] d. The lower non-woven fabric is squeezed inward at the through groove by a first pressing roller mechanism, so that the lower non-woven fabric at the through groove is compositely connected with the middle non-woven fabric, and a second convex strip corresponding to the through groove is provided on the pressing roller of the first pressing roller mechanism;

[0027] e. Apply glue to the upper surface of the middle layer non-woven fabric;

[0028] f. The polymer water-absorbing resin particles and the wood pulp fibers are mixed by negative pressure adsorption conveying through the second feed bin and deposited in the second mold cavity of the second molding die wheel, wherein the second mold cavity includes three grooves arranged side by side along the axial direction of the second molding die wheel, so that three upper absorbent bodies are formed side by side in the second mold cavity of the second molding die wheel, and then the upper absorbent bodies are transferred to the upper surface of the middle layer non-woven fabric;

[0029] g. unwinding the rolled upper nonwoven fabric for transportation, applying glue to the lower surface of the upper nonwoven fabric, and then laminating the upper nonwoven fabric to the product in step f;

[0030] h. The upper nonwoven fabric is squeezed inwardly between two adjacent upper absorbent bodies by a second pressing roller mechanism, so that the upper nonwoven fabric is compositely connected with the middle nonwoven fabric, and the pressing roller of the second pressing roller mechanism is provided with an annular convex strip;

[0031] i. Cutting the product of step h into individual absorbent cores;

[0032] (4) preparing a liquid-impermeable bottom layer;

[0033] (5) laminating and compositely connecting the liquid-impermeable bottom layer, the absorbent core layer, the flow-guiding layer, and the liquid-permeable surface layer in sequence from bottom to top;

[0034] (6) Cutting the product of step (5) along the space between two adjacent absorbent cores to form a single composite core diaper.

[0035] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: when the composite core diaper and its preparation method are used, urine discharged by the human body is guided by the guide layer and then enters the absorbent core layer, and a part of the urine is absorbed by the upper absorbent body, and because the upper absorbent body includes 20% by weight of high molecular water-absorbing resin particles and 80% by weight of wood pulp fibers, the upper absorbent body has a certain guiding and downward infiltration effect after absorption, and another part of the urine overflows to between two adjacent upper absorbent bodies and is guided in this area to increase the diffusion speed, and at the same time, the urine between the two adjacent upper absorbent bodies further infiltrates through the through groove of the lower absorbent body and enters the through groove of the lower absorbent body. The invention relates to a lower absorbent body on the peripheral side of the skin, and because the lower absorbent body includes 70% by weight of high-molecular water-absorbent resin particles and 30% by weight of wood pulp fibers, the absorption capacity of the lower absorbent body is improved. At the same time, urine that seeps downward through the upper absorbent body is also adsorbed by the lower absorbent body, so that the urine is kept away from the liquid-permeable surface layer, thereby improving the comfort of use. In addition, a small amount of high-molecular water-absorbent resin particles are present between the two through grooves in the diversion area during molding, which expand after absorbing urine, so that a bulge is formed between the two adjacent upper absorbent bodies, thereby diverting the urine to the lateral sides, facilitating the rapid absorption of the upper and lower absorbent bodies, and further improving the diffusion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0037] Figure 2 is a schematic diagram of the top view of the diaper body in 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 yes Figure 3 A partial enlarged view of point B in the middle;

[0040] Figure 5 is a schematic diagram of the top view of the lower absorbent body in an embodiment of the present invention;

[0041] Figure 6 1 is a front view structural schematic diagram of the first feed bin and the first forming die wheel in an embodiment of the present invention;

[0042] Figure 7 is a schematic diagram of the three-dimensional structure of the first molding die wheel in an embodiment of the present invention;

[0043] Figure 8 is a schematic diagram of the three-dimensional structure of the second molding die wheel in an embodiment of the present invention;

[0044] Fig. 9It is a schematic diagram of the three-dimensional structure of the first pressing roller mechanism in an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1. Diaper body; 2. Diversion area; 3. Absorption area; 4. Through groove; 5. Spacing; 6. Overlap area; 7. Permeation area; 11. Liquid-permeable surface layer; 12. Diversion layer; 13. Absorption core layer; 14. Liquid-impermeable bottom layer;

[0047] 101, front waist region; 102, crotch region; 103, back waist region; 111, third hydrophilic nonwoven fabric; 112, hydrophobic nonwoven fabric; 113, leg elastic band; 121, first hydrophilic nonwoven fabric; 122, second hydrophilic nonwoven fabric; 123, hydrophilic fiber; 131, upper nonwoven fabric; 132, middle nonwoven fabric; 133, lower nonwoven fabric; 134, upper absorbent body; 135, lower absorbent body;

[0048] 21. First feed bin; 211. Bin body; 212. Feed port; 213. Discharge port; 214. Partition; 215. First flow channel; 216. Second flow channel; 217. Third flow channel; 218. Fourth flow channel; 219. Fifth flow channel; 22. First molding die wheel; 221. First mold cavity; 222. First convex strip; 223. Adsorption hole; 231. First polymer water-absorbing resin particle feed pipe; 232. Second polymer water-absorbing resin particle feed pipe; 24. First pressing roller mechanism; 241. Pressing roller; 242. Second convex strip; 25. Second molding die wheel; 251. Second mold cavity; 252. Groove. DETAILED DESCRIPTION

[0049] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0050] The embodiments of the present invention are:

[0051] refer to Figures 1 to 5 As shown, a composite core diaper comprises a diaper body 1, a longitudinal direction extending along the length direction of the diaper body 1, and a transverse direction extending along the width direction of the diaper body 1, wherein the diaper body 1 comprises a front waist region 101, a crotch region 102 and a rear waist region 103 sequentially distributed along the longitudinal direction, and the diaper body 1 comprises a liquid permeable surface layer 11, a guide layer 12, an absorbent core layer 13 and a liquid impermeable bottom layer 14 sequentially stacked from top to bottom;

[0052] The absorbent core layer 13 comprises an upper nonwoven fabric 131, a middle nonwoven fabric 132, a lower nonwoven fabric 133, three upper absorbent bodies 134 and a lower absorbent body 135;

[0053] The lower absorbent body 135 is arranged on the lower non-woven fabric 133, and the lower absorbent body 135 includes 60% to 70% by weight of polymer water-absorbent resin particles and 30% to 40% by weight of wood pulp fibers. Preferably, the lower absorbent body 135 includes 70% by weight of polymer water-absorbent resin particles and 30% by weight of wood pulp fibers. Two guide areas 2 are arranged on the lower absorbent body 135 at intervals in the transverse direction, and an absorption area 3 is formed on the peripheral side of each guide area 2. Each guide area 2 penetrates the lower absorbent body 135 in the longitudinal direction. The gram weight of the polymer water-absorbent resin particles located in the guide area 2 on the lower absorbent body 135 is less than that of the polymer water-absorbent resin particles located in the absorption area 3 on the lower absorbent body 135. The weight of the particles, two groups of guide components are arranged on the lower absorbent body 135 at the guide area 2, and the two groups of guide components are spaced apart in the transverse direction. The guide components include a plurality of through grooves 4 spaced apart in the longitudinal direction, and each through groove 4 is distributed in the longitudinal direction. The through grooves 4 on each guide component are staggered, and the longitudinal length of each through groove 4 is 15mm to 40mm, preferably 20mm, and the transverse width of each through groove 4 is 8mm to 12mm, preferably 8mm. The middle layer non-woven fabric 132 is arranged on the lower absorbent body 135, and the lower layer non-woven fabric 133 is recessed inward at the through groove 4 and covers the side wall of the through groove 4, and is bonded to the middle layer non-woven fabric 132;

[0054] Each of the upper absorbent bodies 134 is arranged on the middle non-woven fabric 132 at intervals along the transverse direction, and the upper absorbent body 134 includes 20% to 30% by weight of high molecular water-absorbing resin particles and 70% to 80% by weight of wood pulp fibers. Preferably, the upper absorbent body 134 includes 20% by weight of high molecular water-absorbing resin particles and 80% by weight of wood pulp fibers. A gap 5 is formed between two adjacent upper absorbent bodies 134, and the orthographic projection area of ​​the gap 5 coincides with the orthographic projection area of ​​the diversion area 2. The upper non-woven fabric 131 is arranged on the upper absorbent body 134, and the upper non-woven fabric 131 is recessed inward at the gap 5 to cover the side wall of the upper absorbent body 134, and is bonded and connected to the middle non-woven fabric 132 to form a diversion groove;

[0055] The lateral width of the lower non-woven fabric 133 is 15 mm to 30 mm larger than that of the upper non-woven fabric 131 , preferably 18 mm. The lateral sides of the lower non-woven fabric 133 are folded upward and inward and attached to the upper surface of the upper non-woven fabric 131 .

[0056] When the composite core diaper is used, urine discharged from the human body is guided by the guide layer 12 and then enters the absorbent core layer 13, and a part of the urine is absorbed by the upper absorbent body 134. Since the upper absorbent body 134 includes 20% by weight of high molecular water-absorbing resin particles and 80% by weight of wood pulp fibers, the upper absorbent body 134 has a certain guiding and downward infiltration effect after absorption, and another part of the urine overflows between two adjacent upper absorbent bodies 134 and is guided in this area to increase the diffusion speed. At the same time, the urine between the two adjacent upper absorbent bodies 134 further infiltrates through the through groove 4 of the lower absorbent body 135 and enters the lower absorbent body 135 on the side of the through groove 4, and Since the lower absorbent body 135 includes 70% by weight of high molecular water-absorbent resin particles and 30% by weight of wood pulp fibers, the absorption capacity of the lower absorbent body 135 is increased. At the same time, urine that seeps through the upper absorbent body 134 is also adsorbed by the lower absorbent body 135, so that the urine is kept away from the liquid-permeable surface layer 11, thereby improving the comfort of use. In addition, a small amount of high molecular water-absorbent resin particles are present between the two through grooves 4 in the diversion area 2 during molding. After absorbing urine, the particles expand, causing a bulge between the two adjacent upper absorbent bodies 134, thereby diverting the urine to the lateral sides, facilitating rapid absorption by the upper absorbent body 134 and the lower absorbent body 135, and further improving the diffusion efficiency.

[0057] Furthermore, the spacing dimension between two adjacent through grooves 4 on the same group of the guide components is smaller than the longitudinal length dimension of the through grooves 4, so that the two groups of guide components have overlapping areas 6 in the transverse direction, and the ratio of the longitudinal length dimension of the overlapping areas 6 of each of the through grooves 4 to the longitudinal length dimension of the through grooves 4 is 1 to 4:10. Preferably, the ratio of the longitudinal length dimension of the overlapping areas 6 of each of the through grooves 4 to the longitudinal length dimension of the through grooves 4 is 3:10, thereby ensuring the strength of the absorbent core layer 13 while improving its bending effect, thereby improving the fit during use, and increasing the infiltration rate of urine and improving the absorption efficiency.

[0058] It is worth noting that the side wall of the through groove 4 has a permeable area 7 that does not contain high molecular water-absorbent resin particles. The width of the permeable area 7 is 3 mm to 7 mm, preferably 4 mm, so that only wood pulp fibers are deposited in the permeable area 7, avoiding blockage due to swelling of the high molecular water-absorbent resin particles after absorbing water. This can accelerate the infiltration of urine, improve the absorption speed, and reduce the leakage of the high molecular water-absorbent resin particles.

[0059] In this embodiment, the guide layer 12 includes a first hydrophilic non-woven fabric 121, a second hydrophilic non-woven fabric 122, and 95% by weight of hydrophilic fibers 123 sandwiched between the first hydrophilic non-woven fabric 121 and the second hydrophilic non-woven fabric 122. When the absorbent core layer 13 absorbs water and expands, the guide layer 12 located at the guide groove is recessed in the guide groove, thereby improving the guide efficiency of the guide layer 12, and improving the surface dryness of the liquid-permeable surface layer 11, thereby improving the comfort of use. The liquid-permeable surface layer 11 includes a third hydrophilic non-woven fabric 111, a hydrophobic non-woven fabric 112 distributed on both sides of the third hydrophilic non-woven fabric 111, and a leg elastic band 113 arranged on the free end of the hydrophobic non-woven fabric 112.

[0060] A method for preparing a composite core diaper, used for preparing the composite core diaper, comprises the following steps:

[0061] (1) preparing a liquid-permeable surface layer 11;

[0062] (2) preparing a guide layer 12;

[0063] (3) Preparation of the absorbent core layer 13:

[0064] a. Unwind and convey the rolled lower nonwoven fabric 133, and apply glue to the upper surface of the lower nonwoven fabric 133, defining the conveying direction of the lower nonwoven fabric 133 as the longitudinal direction and the width direction of the lower nonwoven fabric 133 as the transverse direction:

[0065] b. The polymer water-absorbent resin particles and the wood pulp fibers are mixed and conveyed by the first feed bin 21 under negative pressure adsorption, and deposited in the first mold cavity 221 of the first molding die wheel 22. The first mold cavity 221 is provided with a first convex strip 222 corresponding to the through groove 4. The side of the first convex strip 222 is provided with an adsorption hole 223, which can adsorb and attach the wood pulp fibers to the side of the first convex strip 222 to form a permeable area 7, so that the lower absorbent body 135 is formed in the first mold cavity 221 of the first molding die wheel 22, and then the lower absorbent body 135 is transferred to the upper surface of the lower non-woven fabric 133;

[0066] Specifically, the first feed bin 21 includes a bin body 211, the bin body 211 has a wood pulp fiber feed port 212, a discharge port 213 and a cavity connecting the wood pulp fiber feed port 212 and the discharge port 213, four partitions 214 are arranged side by side in the cavity, and the cavity is divided into a first flow channel 215, a second flow channel 216, a third flow channel 217, a fourth flow channel 218 and a fifth flow channel 219 in sequence, and the bin body 211 is provided with a first polymer water-absorbing resin A fat particle feed pipe 231 and a second polymer water-absorbent resin particle feed pipe 232, wherein the outlet of the first polymer water-absorbent resin particle feed pipe 231 is distributed at the second flow channel 216, and the outlet of the second polymer water-absorbent resin particle feed pipe 232 is distributed at the fourth flow channel 218, so that the gram weight of the polymer water-absorbent resin particles located at the guide area 2 on the lower absorbent body 135 is less than the gram weight of the polymer water-absorbent resin particles located at the absorption area 3 on the lower absorbent body 135;

[0067] c. unwinding and conveying the rolled middle nonwoven fabric 132, applying glue to the lower surface of the middle nonwoven fabric 132, and then laminating the middle nonwoven fabric 132 to the product in step b;

[0068] d. The lower non-woven fabric 133 is pressed inward at the through groove 4 by the first pressing roller mechanism 24, so that the lower non-woven fabric 133 at the through groove 4 is compositely connected with the middle non-woven fabric 132, and the pressing roller 241 of the first pressing roller mechanism 24 is provided with a second convex strip 242 corresponding to the through groove 4;

[0069] e. applying glue to the upper surface of the middle layer nonwoven fabric 132;

[0070] f. The polymer water-absorbing resin particles and the wood pulp fibers are mixed by negative pressure adsorption conveying through the second feed bin and deposited in the second mold cavity 251 of the second molding die wheel 25. The second mold cavity 251 includes three grooves 252 arranged side by side along the axial direction of the second molding die wheel 25, so that three upper absorbent bodies 134 are formed side by side in the second mold cavity 251 of the second molding die wheel 25, and then the upper absorbent bodies 134 are transferred to the upper surface of the middle layer non-woven fabric 132. The second feed bin is a prior art and will not be described in detail here.

[0071] g. unwinding and conveying the rolled upper nonwoven fabric 131, applying glue to the lower surface of the upper nonwoven fabric 131, and then laminating the upper nonwoven fabric 131 to the product in step f;

[0072] h. The upper nonwoven fabric 131 is squeezed inwardly between two adjacent upper absorbent bodies 134 by a second pressing roller mechanism, so that the upper nonwoven fabric 131 is compositely connected with the middle nonwoven fabric 132. The pressing roller of the second pressing roller mechanism is provided with an annular convex strip. The second pressing roller mechanism is a prior art and will not be described in detail here.

[0073] i. Cutting the product of step h into individual absorbent cores;

[0074] (4) preparing a liquid-impermeable bottom layer 14;

[0075] (5) The liquid-impermeable bottom layer 14, the absorbent core layer 13, the guide layer 12 and the liquid-permeable surface layer 11 are laminated and connected in sequence from bottom to top;

[0076] (6) Cutting the product of step (5) along the space between two adjacent absorbent cores to form a single composite core diaper.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0080] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A composite core diaper, characterized in that: The diaper body comprises a diaper body, wherein the longitudinal direction is defined as the longitudinal direction, and the width direction is defined as the transverse direction. The diaper body comprises a front waist region, a crotch region and a back waist region sequentially distributed along the longitudinal direction. The diaper body comprises a liquid permeable surface layer, a flow guide layer, an absorbent core layer and a liquid impermeable bottom layer sequentially stacked from top to bottom. The absorbent core layer comprises an upper nonwoven fabric, a middle nonwoven fabric, a lower nonwoven fabric, at least three upper absorbent bodies and a lower absorbent body; The lower absorbent body is arranged on the lower non-woven fabric, the lower absorbent body comprises 60% to 70% by weight of high molecular water-absorbing resin particles and 30% to 40% by weight of wood pulp fibers, at least two guide areas are arranged on the lower absorbent body in a transverse direction, the peripheral side of each guide area forms an absorption area, each guide area penetrates the lower absorbent body in a longitudinal direction, the gram weight of the high molecular water-absorbing resin particles located in the guide area on the lower absorbent body is less than the gram weight of the high molecular water-absorbing resin particles located in the absorption area on the lower absorbent body, at least one group of guide components is arranged on the lower absorbent body at the guide area, the guide component comprises a plurality of through grooves arranged in a longitudinal direction, each through groove is distributed in the longitudinal direction, and the longitudinal length dimension of each through groove is 15 mm to 40 mm, the middle non-woven fabric is arranged on the lower absorbent body, the lower non-woven fabric is recessed inward at the through groove and covers the side wall of the through groove, and is bonded and connected with the middle non-woven fabric; Each of the upper absorbent bodies is arranged on the middle non-woven fabric at intervals along the transverse direction, the upper absorbent bodies include 20% to 30% by weight of high molecular water-absorbing resin particles and 70% to 80% by weight of wood pulp fibers, a gap is formed between two adjacent upper absorbent bodies, the orthographic projection area of ​​the gap coincides with the orthographic projection area of ​​the guide area, the upper non-woven fabric is arranged on the upper absorbent body, the upper non-woven fabric is recessed inwardly at the gap and covers the side wall of the upper absorbent body, and is bonded and connected to the middle non-woven fabric to form a guide groove; The method for preparing the diaper body comprises the following steps: (1) preparing a liquid-permeable surface layer; (2) preparing a flow-guiding layer; (3) Preparation of absorbent core layer: a. Unroll the rolled lower non-woven fabric and apply glue to the upper surface of the lower non-woven fabric. Define the conveying direction of the lower non-woven fabric as the longitudinal direction and the width direction as the transverse direction: b. The polymer water-absorbent resin particles and the wood pulp fibers are mixed and conveyed by negative pressure adsorption through the first feed bin and deposited in the first mold cavity of the first molding die wheel. The first mold cavity is provided with a first convex strip corresponding to the through groove, so that the lower absorbent body is formed in the first mold cavity of the first molding die wheel, and then the lower absorbent body is transferred to the upper surface of the lower non-woven fabric; c. unwinding the rolled middle nonwoven fabric for transportation, applying glue to the lower surface of the middle nonwoven fabric, and then laminating the middle nonwoven fabric on the product in step b; d. The lower non-woven fabric is squeezed inward at the through groove by a first pressing roller mechanism, so that the lower non-woven fabric at the through groove is compositely connected with the middle non-woven fabric, and a second convex strip corresponding to the through groove is provided on the pressing roller of the first pressing roller mechanism; e. Apply glue to the upper surface of the middle layer non-woven fabric; f. The polymer water-absorbing resin particles and the wood pulp fibers are mixed by negative pressure adsorption conveying through the second feed bin and deposited in the second mold cavity of the second molding die wheel, wherein the second mold cavity includes three grooves arranged side by side along the axial direction of the second molding die wheel, so that three upper absorbent bodies are formed side by side in the second mold cavity of the second molding die wheel, and then the upper absorbent bodies are transferred to the upper surface of the middle layer non-woven fabric; g. unwinding the rolled upper nonwoven fabric for transportation, applying glue to the lower surface of the upper nonwoven fabric, and then laminating the upper nonwoven fabric to the product in step f; h. The upper nonwoven fabric is squeezed inwardly between two adjacent upper absorbent bodies by a second pressing roller mechanism, so that the upper nonwoven fabric is compositely connected with the middle nonwoven fabric, and the pressing roller of the second pressing roller mechanism is provided with an annular convex strip; i. Cutting the product of step h into individual absorbent cores; (4) preparing a liquid-impermeable bottom layer; (5) laminating and compositely connecting the liquid-impermeable bottom layer, the absorbent core layer, the flow-guiding layer, and the liquid-permeable surface layer in sequence from bottom to top; (6) Cutting the product of step (5) along the space between two adjacent absorbent cores to form a single composite core diaper.

2. The composite core diaper according to claim 1, characterized in that: Two groups of flow guide components are arranged on the lower absorbent body at the flow guide area. The two groups of flow guide components are spaced apart in the transverse direction, and the through grooves on each of the flow guide components are staggered.

3. The composite core diaper according to claim 2, characterized in that: The spacing dimension between two adjacent through grooves on the same group of the guide components is smaller than the longitudinal length dimension of the through grooves, so that the two groups of guide components have overlapping areas in the transverse direction.

4. The composite core diaper according to claim 3, characterized in that: The ratio of the longitudinal length dimension of the overlapping areas of the through slots to the longitudinal length dimension of the through slots is 1 to 4:

10.

5. The composite core diaper according to any one of claims 1 to 4, characterized in that: The side wall of the through groove has a permeable area without polymer water-absorbing resin particles, and the width of the permeable area is 3 mm to 7 mm.

6. The composite core diaper according to claim 5, characterized in that: The guide layer includes a first hydrophilic nonwoven fabric, a second hydrophilic nonwoven fabric, and at least 90% by weight of hydrophilic fibers sandwiched between the first hydrophilic nonwoven fabric and the second hydrophilic nonwoven fabric. When the absorbent core layer absorbs water and expands, the guide layer located at the guide groove is recessed in the guide groove.

7. The composite core diaper according to claim 6, characterized in that: The transverse width of each through groove is 8 mm to 12 mm.

8. The composite core diaper according to claim 7, characterized in that: The lateral width of the lower nonwoven fabric is 15 mm to 30 mm greater than that of the upper nonwoven fabric, and the lateral sides of the lower nonwoven fabric are folded upward and inward and attached to the upper surface of the upper nonwoven fabric.

9. The composite core diaper according to claim 8, characterized in that: The liquid-permeable surface layer comprises a third hydrophilic nonwoven fabric, hydrophobic nonwoven fabrics distributed on both lateral sides of the third hydrophilic nonwoven fabric, and leg elastic bands arranged on the free ends of the hydrophobic nonwoven fabric.

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