A method for producing a dry paper diaper

Abstract

This invention relates to the field of disposable hygiene products technology, specifically to a method for preparing a dry diaper. The preparation of the water-repellent bottom layer includes the following steps: ① continuously conveying a water-repellent nonwoven fabric and a liquid-impermeable PE bottom film; ② hot-pressing the middle of the water-repellent nonwoven fabric to form multiple spaced grooves on its surface; ③ applying adhesive to the upper surface of the PE bottom film to form multiple annular adhesive areas, with the center of each adhesive area being an unadhesive area; ④ laminating the PE bottom film obtained in step ③ onto the lower surface of the water-repellent nonwoven fabric, with the grooves positioned at the unadhesive areas; when the hydrophilic surface layer is laminated with the absorbent core and the water-repellent bottom layer, the lower surface layer between the two folds is positioned above the grooves. This invention solves the problem of poor dryness in existing diaper products.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products technology, specifically to a method for preparing a dry diaper. Background Technology

[0002] In the hygiene products industry, for diaper products, if you want to keep the skin dry during use, the rapid flow and absorption of liquid are particularly important. When the liquid is absorbed too slowly or the shrinkage ability decreases, the area in contact with the skin will become damp, causing a sticky and uncomfortable feeling. Over time, this can even lead to eczema and "red bottom" symptoms.

[0003] Existing diaper products that emphasize dryness, such as the one described in Chinese patent application CN 213157017 U, include a leak-proof fastening structure and a main body. The leak-proof fastening structure is disposed on the main body. The main body includes a dry layer, a core, and a bottom layer arranged sequentially. The dry layer includes a breathable layer and a drainage layer. The drainage layer covers and is connected to the core, and the breathable layer covers and is connected to the drainage layer. The breathable layer has several through-holes distributed on it. Structurally, urine is guided through the drainage layer, which is equivalent to a traditional flow-through layer structure. A breathable layer structure is also provided to increase breathability. However, as described in the patent application, the breathable layer uses an oil- and water-repellent fabric. Although the breathable layer has through-holes for ventilation, this obviously affects the rapid absorption of urine. This makes it more likely to leak due to the slow absorption rate when the liquid volume is large, greatly affecting the use of the diaper.

[0004] Therefore, the main purpose of this application is to design a product that reduces prolonged contact between the skin and urine and has a fast absorption rate. Summary of the Invention

[0005] Therefore, the present invention provides a method for preparing a dry diaper, which solves the problem of poor dryness in existing diaper products.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A method for preparing a dry diaper includes preparing a hydrophilic surface layer, preparing an absorbent core, preparing a water-repellent bottom layer, and slicing the hydrophilic surface layer, absorbent core, and water-repellent bottom layer together. The method is characterized by the following steps in preparing the absorbent core:

[0008] a. Take two hydrophilic nonwoven fabrics as the upper and lower layers of the core and continuously convey them respectively. Define the width direction of the upper and lower layers as the transverse direction.

[0009] b. Apply adhesive to the upper surface of the lower layer and continue conveying;

[0010] c. Apply absorbent material to the upper surface of the lower surface layer to bond the absorbent material to the lower surface layer after adhesive application. The absorbent material is composed of fluff pulp and SAP, and after being laid out, it forms a separate fluff pulp layer and SAP layer.

[0011] d. Fold the lower surface layer on both sides of which the absorbent material was applied in step c inward, so that the lower surface layer being continuously conveyed forms multiple folded parts on both sides. The inner surface of the folded parts is bonded with a fluff pulp layer, while the lower surface layer between the two folded parts is distributed with a fluff pulp layer and a SAP layer.

[0012] e. Apply adhesive to the lower surface of the upper layer and continue conveying it to bond it with the lower layer;

[0013] f. After compounding, the absorber is slit and molded to obtain a single absorber;

[0014] The preparation of the water-repellent substrate includes the following steps:

[0015] ① Take a water-repellent non-woven fabric and a liquid-impermeable PE bottom film for continuous conveying;

[0016] ② Hot pressing is performed on the middle part of the water-repellent nonwoven fabric to form multiple recessed grooves on its surface at intervals;

[0017] ③ Apply adhesive to the upper surface of the PE base film to form multiple annular adhesive areas on its surface, with the center of each adhesive area being an unadhesive area;

[0018] ④ The PE base film obtained in step ③ is laminated onto the lower surface of the water-repellent nonwoven fabric, and the position of the lower groove is located in the uncoated area;

[0019] When the hydrophilic surface layer is combined with the absorbent and water-repellent bottom layer, the lower surface layer between the two folded portions is located above the lower groove.

[0020] Preferably, in step d, the upper surfaces of the fluff pulp layer and the SAP layer are provided with a dotted array of flow-guiding protrusions.

[0021] Preferably, in step e above, the adhesive application position of the upper surface layer is located on both sides of its lateral direction, and the composite position of the upper surface layer and the lower surface layer is located on the upper surface of the folded part.

[0022] Preferably, a flow-guiding layer is provided between the hydrophilic surface layer and the upper surface layer.

[0023] Preferably, the hydrophilic surface layer is provided with symmetrically distributed leak-proof partitions, and the folded portion is located inside the leak-proof partitions.

[0024] Preferably, in step d above, the thickness of the fluff pulp layer on the lower surface between the two folded portions gradually decreases from the center to both sides.

[0025] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0026] This technical solution designs a diaper product structure that features rapid absorption, complete leak prevention, and reduced contact between the absorbent core and human skin after absorbing liquid and swelling. After urine enters the absorbent core, a folded structure formed by inward folding on both sides creates protrusions on both sides of the absorbent core. These protrusions allow the absorbent material inside to expand after absorbing urine, creating a certain thickness extension space. The bottom water-repellent layer also features a corresponding recessed structure to accommodate the expansion and contraction of the absorbent core's internal SAP (superabsorbent polymer). Furthermore, the water-repellent bottom layer has a double-layer structure. The PE bottom film at the very bottom of the diaper maintains its water-repellent effect, while the upper water-repellent non-woven fabric is not bonded to it in the un-adhesive area. This allows the recessed structure to accommodate the expansion of the upper absorbent core, thereby reducing absorbing liquid and swelling. The absorbent core expands upwards to reduce the large area of ​​skin contact that traditional diapers experience after the absorbent core expands, resulting in a diaper with better dryness after absorbing urine compared to traditional structures. During distribution, the internal absorbent material forms a layered design of fluff pulp and SAP, with the SAP located at the bottom. After absorbing urine, the SAP extends further towards the lower groove due to gravity, improving the dryness of the absorbent material itself. Furthermore, as the absorbent material expands, the shape of the folds deforms, increasing the thickness and altering the internal space between the folds. This further reduces skin contact with urine, ensuring the diaper remains as dry as possible after absorbing urine. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the layered structure of the diaper in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall process structure for preparing the absorber in Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the guide folding assembly in Embodiment 1 of the present invention;

[0030] Figure 4 This is a schematic diagram of the positional distribution structure of the molding unit in Embodiment 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the layered structure of the diaper in Embodiment 2 of the present invention.

[0032] Figure 6 This is a schematic diagram of the overall process structure for preparing the absorber in Embodiment 2 of the present invention.

[0033] Reference numerals: 1. Hydrophilic surface layer; 11. Leak-proof partition; 2. Absorbent; 21. Fluff pulp layer; 22. SAP layer; 23. Fold; 3. Water-repellent bottom layer; 31. Water-repellent nonwoven fabric; 311. Lower groove; 32. PE bottom film; 32a. Adhesive application area; 32b. Unadhesive application area; 4. Guide layer; m. Upper surface layer; n. Lower surface layer; 5. Guide protrusion; 100. Upper conveying unit; 200. Lower conveying unit; 300. Feeding unit; 300a. SAP adding device; 300b. Cotton forming device; 400. Adhesive application unit; 500. Hot pressing welding unit; 600. Forming unit; 601. First inclined guide plate; 602. Second inclined guide plate; 603. Third inclined guide plate; 604. Outer longitudinal plate; 605. Bottom plate; 606. Waist-shaped hole; 700. Adsorption tank. Detailed Implementation

[0034] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0035] Example 1

[0036] refer to Figure 1 A method for preparing a dry diaper includes preparing a hydrophilic surface layer 1, preparing an absorbent core 2, preparing a water-repellent bottom layer 3, and then slicing the hydrophilic surface layer 1, absorbent core 2, and water-repellent bottom layer 3 together. The method is characterized in that preparing the absorbent core 2 includes the following steps:

[0037] a. Take two hydrophilic nonwoven fabrics as the upper surface layer m and the lower surface layer n as the core and continuously convey them respectively. Define the width direction of the upper surface layer m and the lower surface layer n as the transverse direction.

[0038] b. Apply adhesive to the upper surface of the lower layer n and continue conveying;

[0039] c. Apply absorbent material to the upper surface of the lower surface layer n to bond the absorbent material to the lower surface layer n after sizing. The absorbent material is composed of fluff pulp and SAP. After being laid out, it forms separate fluff pulp layer 21 and SAP layer 22.

[0040] d. Fold the lower surface layer n, on both sides of which the absorbent material was applied in step c, inward to form multiple layers of folded portions 23 on both sides of the continuously conveyed lower surface layer n. The inner surface of the folded portion 23 is bonded with a fluff pulp layer 21, while the lower surface layer n between the two folded portions 23 is distributed with a fluff pulp layer 21 and a SAP layer 22.

[0041] e. Apply adhesive to the lower surface of the upper surface layer m and continue to transport it, so as to combine it with the lower surface layer n; specifically, the adhesive application position of the upper surface layer m is located on its lateral sides, and the composite position of the upper surface layer m and the lower surface layer n is located on the upper surface of the folded part 23. That is, after the upper surface layer m is bonded, it does not affect the deformation of the folded part 23. However, after the absorbent body 2 absorbs liquid, the folded part 23 will deform with the expansion of the SAP material, thereby further increasing the height of the folded part 23 and the internal hollow structure will also increase accordingly, so as to further separate the upper hydrophilic surface layer 1 from the center position of the absorbent body 2, so as to reduce pressure backflow;

[0042] f. After compounding, the absorber is slit and molded to obtain a single absorber 2;

[0043] Also refer to Figures 2 to 4 When the absorbent body 2 is formed, the following diaper core forming device is used for production, which includes a frame, and the frame is provided with an upper conveying unit 100 and a lower conveying unit 200 for conveying the upper surface layer m and the lower surface layer n in an assembly line.

[0044] The feeding unit 300 is used to apply absorbent material to the lower surface layer n conveyed by the lower conveying unit 200. The feeding unit 300 is configured to include a SAP adding device 300a and a cotton forming device 300b arranged in sequence, and to feed the materials separately so that the wood pulp and paper pulp with good water absorption and fast diffusion are arranged separately from the water-locking SAP material. In this way, the spatial distribution of the two materials, such as the stacking position and the lateral position, can be adjusted according to the needs to suit the production of products with different property requirements.

[0045] The adhesive application unit 400 is used for applying adhesive to the upper surface layer m and the lower surface layer n. The adhesive application unit 400 is either spiral adhesive application or spray adhesive application. Here, spray adhesive application is used for ease of structural arrangement.

[0046] A hot-press welding unit 500 is used to bond the upper surface layer m and the lower surface layer n together. A forming unit 600 for pressing the lower surface layer n inward on both sides of the lateral direction is arranged on the frame of the lower conveying unit 200 at the rear end of the unloading unit 300. The forming unit 600 includes guide folding assemblies arranged on both sides of the lower surface layer n. Each guide folding assembly includes a base plate 605 distributed parallel to the lower surface layer n, an outer longitudinal plate 604 distributed perpendicular to the base plate 605, a first inclined guide plate 601 fixed to the upper edge of the outer longitudinal plate 604, a second inclined guide plate 602 fixed to the end of the first inclined guide plate 601, and a third inclined guide plate 603 fixed to the end of the second inclined guide plate 602. The opening between the second inclined guide plate 602 and the third inclined guide plate 603 gradually decreases from the input end of the lower surface layer n.

[0047] Unlike traditional folding mechanisms in sanitary product manufacturing, the guide folding assembly operates on sheet-like production line material with absorbent material. Therefore, the length of the guide folding assembly should not be too long to avoid large-area displacement of the absorbent material after it is originally glued to the lower surface layer n. Thus, its length needs to be less than 35 cm. Furthermore, since it is formed by pressing and folding on a production line with absorbent material, an adsorption groove 700 is arranged at the forming position, i.e., between the two guide folding assemblies. The width of the adsorption groove 700 is smaller than the width of the lower surface layer n. This allows for a certain extendable end in the unadsorbed area of ​​the adsorption groove 700, which is beneficial to the function of the guide folding assembly. In contrast, the traditional guide roller structure with full lateral coverage has greater limitations on the material of the lower surface layer n, requiring a longer production line length and making it more prone to material damage during internal pressure folding.

[0048] Specifically, both the upper conveying unit 100 and the lower conveying unit 200 include an unwinding roller, a receiving unit, a storage unit, and a correction mechanism; all of the above mechanisms are conventional equipment in the field and can be purchased commercially, and will not be described in detail here.

[0049] The aforementioned SAP refers to superabsorbent polymer (SAP), a commonly used absorbent material in the hygiene products industry. The absorbent sheet is a product of pulp and wood pulp after being crushed, also known as fluff pulp. The specific structure of the forming die wheel mechanism is shown in the prior application CN 215459345 U by an affiliated company of the applicant, and will not be elaborated upon here. Furthermore, the feeding unit 300 should shorten the feeding width during feeding, reducing the amount of absorbent material at the guiding folding assembly's operational position, i.e., at the lateral edges of the lower surface layer n, to facilitate folding and prevent or minimize the absorbent material from falling out of the lower surface layer n during folding. This molding device employs a multi-layered guide folding assembly. During production, when the guide folding assembly acts on both sides of the lower surface layer n, the first inclined guide plate 601 and the second inclined guide plate 602 form the required folds. Then, through the gradually decreasing openings of the third inclined guide plate 603 and the second inclined guide plate 602, the height of the folded positions on both sides of the core gradually decreases until the folded positions fit together, entering the composite process between the lower surface layer n and the upper surface layer m. This process can fold the lateral sides of the lower surface layer n, which is covered with absorbent material, as needed to form the required lateral cross-section. The resulting diaper core has a concave groove structure in the middle. The connection on both sides is affected by factors such as the width of the upper surface layer m, whether it is folded and wrapped, the adhesive structure, and the composition of the internal core material. The concave groove structure can form an expansion space for the core material, and the folded positions on both sides form a liquid-blocking and liquid-absorbing wall in the thickness direction after the liquid enters, ensuring the absorption of the liquid. This multi-layer structure forms a longitudinal space on both sides of the transverse side based on the traditional multi-layer structure core. Different materials can be filled inside according to needs, and different material ratios can be applied to achieve different functions, forming a structure different from traditional multi-layer composite materials. It has good applicability and can meet the current production needs for multi-functional composite cores. Structurally, the first inclined guide plate 601, the second inclined guide plate 602, and the outer longitudinal plate 604 are all hinged. The first inclined guide plate 601 has a waist-shaped hole 606 in the middle. An adjusting rod for adjusting the angle of the first inclined guide plate 601 and supporting the second inclined guide plate 602 passes through the waist-shaped hole 606. In this structure, the lower end of the adjusting rod is screwed onto the base plate 605, allowing the adjusting rod to be rotated to change the height of the contact point of the second inclined guide plate 602, thereby adjusting the opening between the second inclined guide plate 602 and the first inclined guide plate 601. This allows for adjustments to meet the guiding and folding requirements of different products and models, improving the practicality of the structure. During adjustment, the recessed structure of the oblong hole 606 facilitates the rotation of the first inclined guide plate 601. The hinge structure described above can be made of a hinge of suitable size to fix the corresponding guide plate structure.

[0050] In the product, the hydrophilic surface layer 1 is provided with symmetrically distributed leak-proof partitions 11, and the folded portion 23 is located on the inner side of the leak-proof partitions 11. The leak-proof partitions 11 are elastic bands covered with water-repellent material to achieve the function of preventing side leakage on both sides. By placing this structure on the outer side of the folded portion 23, the lateral flow of urine is further isolated, ensuring sufficient blocking when the amount of urine is large, so as to avoid side leakage and ensure absorption. In addition, in order to further improve the diffusion effect, a flow guiding layer 4 is provided between the hydrophilic surface layer 1 and the upper surface layer m. This structure also helps to avoid side leakage.

[0051] The preparation of the water-repellent substrate 3 includes the following steps:

[0052] ① Take a water-repellent nonwoven fabric 31 and a liquid-impermeable PE bottom film 32 for continuous conveying;

[0053] ② Hot pressing is performed on the middle part of the water-repellent nonwoven fabric 31 to form multiple grooves 311 spaced apart on its surface;

[0054] ③ Apply adhesive to the upper surface of the PE base film 32 to form multiple annular adhesive application areas 32a on its surface, with the unadhesive application area 32b at the center of the adhesive application area 32a.

[0055] ④ The PE bottom film 32 obtained in step ③ is laminated onto the lower surface of the water-repellent nonwoven fabric 31, and the position of the lower groove 311 is located at the uncoated area 32b; the coated area 32a ensures the structural stability of the water-repellent bottom layer 3, while the uncoated area 32b makes each lower groove 311 structure movable, and thus can deform to a certain extent with the deformation of the absorbent 2;

[0056] When the hydrophilic surface layer 1 is combined with the absorbent body 2 and the water-repellent bottom layer 3, the position of the lower surface layer n between the two folded portions 23 is located above the lower groove 311. This technical solution designs a diaper product structure that absorbs quickly, completely prevents leakage, and reduces the contact between the absorbent body 2 and the human skin after absorbing liquid and swelling. After urine enters the absorbent body 2, the folded portions 23 formed by the inward folding on both sides create protrusions on both sides of the absorbent body 2. These protrusions can form a certain thickness extension space after the absorbent material inside absorbs urine. The bottom water-repellent bottom layer 3 is also designed with a corresponding lower groove 311 structure that allows the SAP inside the absorbent body 2 to expand and stretch. The water-repellent bottom layer 3 has a double-layer structure. The PE bottom film 32 at the bottom of the diaper still maintains the water-repellent effect, while the upper water-repellent non-woven fabric 31 is not bonded to it at the unbonded area 32b, so that the lower groove 311 structure can accommodate the expansion of the upper absorbent body 2, thereby reducing leakage. The absorbent core 2 does not expand upwards after absorbing liquid, thus reducing the large area of ​​skin contact caused by the expansion of the absorbent core 2 in traditional diapers. This results in a diaper with stronger dryness after absorbing liquid compared to traditional structures. During the distribution of the internal absorbent material, a layered design of fluff pulp and SAP is formed, with the SAP located at the bottom. After absorbing liquid, it is more likely to extend towards the lower groove 311 due to gravity, improving the dryness characteristics from the perspective of the absorbent material inside the absorbent core 2. Furthermore, as the absorbent material expands, the shape of the fold 23 will deform to a certain extent, increasing its thickness and changing the internal hollow space between the two folds 23. This further reduces the skin contact with urine, ensuring that the diaper remains as dry as possible after absorbing liquid.

[0057] In the product, the hydrophilic surface layer 1 is provided with symmetrically distributed leak-proof partitions 11, and the folded portion 23 is located on the inner side of the leak-proof partitions 11. The leak-proof partitions 11 are elastic bands covered with water-repellent material to achieve the function of preventing side leakage on both sides. By placing this structure on the outer side of the folded portion 23, the lateral flow of urine is further isolated, ensuring sufficient blocking when the amount of urine is large, so as to avoid side leakage and ensure absorption. In addition, in order to further improve the diffusion effect, a flow guiding layer 4 is provided between the hydrophilic surface layer 1 and the upper surface layer m. This structure also helps to avoid side leakage.

[0058] Example 2

[0059] refer to Figure 5 , Figure 6Compared to Embodiment 1, in step d, the upper surfaces of the fluff pulp layer 21 and the SAP layer 22 are provided with dot-matrix-shaped flow-guiding protrusions 5. Structurally, the structure of the flow-guiding protrusions 5 is based on the feeding unit 300 of Embodiment 1, with the addition of a cotton forming device 300b to form another flow-guiding structure for the upper surface of the fluff pulp layer 21; furthermore, the structure of the flow-guiding protrusions 5 can also reduce the contact area at the middle of the absorbent body 2 when it comes into contact with the baby, thereby reducing the contact time and keeping the baby's skin dry.

[0060] In this embodiment, in step d above, the thickness of the fluff pulp layer 21 on the lower surface layer n between the two folded portions 23 gradually decreases from the center to both sides; in the equipment, this is achieved by enlarging the central opening of the feeding trough of the cotton forming device 300b to increase the feeding amount at the central position; this allows the urine to spread rapidly from the center to both sides and increases the amount of absorbent material, thereby improving the absorption rate and absorption amount.

[0061] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for preparing a dry diaper, characterized in that: The preparation of the absorbent body (2) includes the following steps: preparing a hydrophilic top layer (1), preparing an absorbent body (2), preparing a hydrophobic bottom layer (3), and then slicing the hydrophilic top layer (1), absorbent body (2), and hydrophobic bottom layer (3). a. Take two hydrophilic nonwoven fabrics as the upper surface layer (m) and lower surface layer (n) of the core and continuously convey them respectively. Define the width direction of the upper surface layer (m) and lower surface layer (n) as the transverse direction. b. Apply adhesive to the upper surface of the lower layer (n) and continue conveying; c. Apply absorbent material to the upper surface of the lower surface layer (n) to bond the absorbent material to the lower surface layer (n) after sizing. The absorbent material is composed of fluff pulp and SAP. After being laid, it forms a separate fluff pulp layer (21) and SAP layer (22). d. Fold the lower surface layer (n) to which the absorbent material was applied in step c inward on both sides, so that the continuously conveyed lower surface layer (n) forms multiple layers of folded parts (23) on both sides. The inner surface of the folded part (23) is bonded with a fluff pulp layer (21), and the lower surface layer (n) between the two folded parts (23) is distributed with a fluff pulp layer (21) and a SAP layer (22). e. Apply adhesive to the lower surface of the upper surface layer (m) and continue conveying it to bond it with the lower surface layer (n); f. After compounding, the absorber is slit and shaped to obtain a single absorber (2); The preparation of the water-repellent substrate (3) includes the following steps: ① Take a water-repellent nonwoven fabric (31) and a liquid-impermeable PE bottom film (32) for continuous transport; ② Hot pressing is performed on the middle part of the water-repellent nonwoven fabric (31) to form multiple grooves (311) that are spaced apart on its surface; ③ Apply adhesive to the upper surface of the PE base film (32) to form multiple annular adhesive application areas (32a) on its surface, with the center of the adhesive application area being the unadhesive area (32b); ④ The PE bottom film (32) obtained in step ③ is laminated onto the lower surface of the water-repellent nonwoven fabric (31), and the position of the lower groove (311) is located at the un-adhesive area (32b); When the hydrophilic surface layer (1) is combined with the absorbent body (2) and the water-repellent bottom layer (3), the position of the lower surface layer (n) between the two folded portions (23) is above the lower groove (311).

2. The method for preparing a dry diaper according to claim 1, characterized in that: In step d, the upper surfaces of the fluff pulp layer (21) and the SAP layer (22) are provided with dot-matrix-shaped flow-guiding protrusions (5).

3. The method for preparing a dry diaper according to claim 1, characterized in that: In step e above, the adhesive application positions of the upper surface layer (m) are located on both sides of its lateral direction, and the composite position of the upper surface layer (m) and the lower surface layer (n) is located on the upper surface of the folded part (23).

4. The method for preparing a dry diaper according to claim 1, characterized in that: A flow guiding layer (4) is provided between the hydrophilic surface layer (1) and the upper surface layer (m).

5. The method for preparing a dry diaper according to claim 1, characterized in that: The hydrophilic surface layer (1) is provided with symmetrically distributed leak-proof partitions (11), and the folded part (23) is located inside the leak-proof partitions (11).

6. A method for preparing a dry diaper according to any one of claims 1-5, characterized in that: In step d above, the thickness of the fluff pulp layer (21) on the lower surface layer (n) between the two folded portions (23) gradually decreases from the center to both sides.

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