High-permeability paper diaper capable of preventing front and back leakage and preparation method of high-permeability paper diaper

Abstract

The invention relates to the field of hygienic products, in particular to a preparation method of a high-permeability paper diaper capable of preventing front and back leakage, and solves the problem that an existing paper diaper is insufficient in front and back leakage prevention effect. The preparation method comprises the following steps that S1, a liquid-tight bottom layer material is taken and continuously conveyed, and single absorption cores are sequentially arranged on the liquid-tight bottom layer material; s2, a liquid-permeable surface layer material and a leakage-proof partition edge material are taken and continuously conveyed, and the leakage-proof partition edge material is symmetrically distributed on the liquid-permeable surface layer material in the transverse direction after being subjected to bottom sizing; s3, taking a leakage-proof enclosure material, continuously conveying the leakage-proof enclosure material, locally gluing the bottom of the leakage-proof enclosure material, cutting the leakage-proof enclosure material into single-piece enclosure materials m1, sequentially arranging the single-piece enclosure materials m1 along the upper surface of the liquid-permeable surface layer at equal intervals, and covering the upper surface of the leakage-proof partition edge material; s4, covering the product obtained in the step S1 with a liquid-permeable surface layer material, and then laminating and compounding the liquid-permeable surface layer material and the product into a whole; and S5, slitting the product obtained in the step S4 to obtain an independent paper diaper product. The method is applied to production of paper diaper products.

Description

Technical Field

[0001] This invention relates to the field of hygiene products, specifically to a high-permeability diaper with anti-leakage front and back and its preparation method. Background Technology

[0002] The core structure of current disposable diaper products includes a top layer, an absorbent core layer, and a leak-proof bottom layer. On top of this, there are additional diversion layers, leak-proof side panels, elastic waistbands, waist tabs, etc. These structures work together to achieve the core functions of "rapid absorption, effective water retention, leak prevention, and keeping dry".

[0003] In the prior art, as shown in technical solution CN 113925686 A, a fully leak-proof diaper / pull-up diaper with front and rear leak-proof functions is disclosed, including a water-repellent bottom film, a breathable membrane layer bonded above the water-repellent bottom film, a strip-shaped absorbent core layer above the breathable membrane layer, and a skin-friendly surface layer penetrating the upper and lower ends of the water-repellent bottom film above the absorbent core layer; three-dimensional guards are bonded to the left and right sides of the water-repellent bottom film located on the absorbent core layer, and the three-dimensional guards are partially located above the absorbent core layer; the water-repellent bottom film has a back leak-proof three-dimensional guard near its upper edge and a front leak-proof three-dimensional guard near its lower edge, with the back leak-proof and front leak-proof three-dimensional guards partially located above the three-dimensional guard, and the free sides of the back leak-proof and front leak-proof three-dimensional guards facing each other.

[0004] Its core feature is the installation of three-dimensional leak-proof guards at the front and back of the diaper product, respectively, to achieve comprehensive leak protection from all sides. For details, please refer to its appendix. Figure 1 The anti-back leakage three-dimensional protective barrier and the anti-front leakage three-dimensional protective barrier are located above the three-dimensional protective barrier. When urine flows to the upper and lower ends, the water-repellent bottom membrane of the anti-back leakage three-dimensional protective barrier and the anti-front leakage three-dimensional protective barrier constitutes a buffer and blocking structure.

[0005] However, under this structure, the connection between the front and rear leakage prevention and the two three-dimensional protective barriers is insufficient, and the front and rear leakage prevention effect cannot be guaranteed when the amount of urine is large. Summary of the Invention

[0006] Therefore, the present invention provides a high-permeability diaper with front and back leakage prevention and its preparation method, which solves the problem of insufficient front and back leakage prevention effect of existing diapers.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: A high-permeability diaper with front and rear leakage prevention includes a liquid-permeable top layer, an absorbent core, and a liquid-impermeable bottom layer stacked from top to bottom. The diaper's length direction is defined as the longitudinal direction, and its width direction as the transverse direction. According to the position when worn by the body, it is divided into the front waist side, crotch area, and back waist side. The liquid-permeable surface layer is provided with leak-proof partitions that extend longitudinally and are symmetrically arranged laterally. Each of the leak-proof partitions extends to both ends of the diaper's longitudinal direction. The front waist side and the back waist side are respectively provided with a front leak-proof guard and a rear leak-proof guard that extend laterally. Both the front leak-proof guard and the rear leak-proof guard include an adhesive part that is bonded to the longitudinal end of the diaper and a free part that is mounted on the upper surface of the two leak-proof partitions. When the diaper is worn, the free part stands up with the two leak-proof partitions and forms pockets at both ends of the diaper's longitudinal direction. The longitudinal ends of the absorbent core extend into the pockets without contacting the adhesive portions of the two pockets.

[0008] Preferably, the absorbent core includes an upper core and a lower core stacked together. The upper core extends from the front waist side to the back waist side and extends to the front and rear leak-proof guards. The lower core extends from the crotch area to the rear leak-proof guard.

[0009] Preferably, the upper surface of the absorbent core is provided with a flow guiding layer, which extends from the front waist side to the crotch area.

[0010] Preferably, the adhesive portion is U-shaped with the opening facing the center of the diaper.

[0011] Preferably, the free portion has an isosceles trapezoidal structure, and its width gradually increases from the end of the diaper inward.

[0012] The above-mentioned method for preparing a high-permeability diaper product with anti-leakage front and back includes the following steps: S1. Take the impermeable bottom material and continuously transport it. Then, arrange the single absorbent cores on the impermeable bottom material in sequence. Define the transport direction as longitudinal, the material width direction as transverse, and the length of the single absorbent core as L1. S2. Take the liquid-permeable surface material and the leak-proof side material and continuously convey them. After applying adhesive to the bottom of the leak-proof side material, it is symmetrically arranged on the liquid-permeable surface material in the transverse direction. S3. Take the leak-proof protective material and continuously convey it. After applying glue to the bottom part, cut it into single protective material m1. Then, arrange them at equal intervals along the upper surface of the liquid-permeable surface layer and cover the upper surface of the leak-proof partition material. S4. After covering the liquid-permeable surface material on the product obtained in step S1, the layers are stacked and composited into one piece. The obtained product is then cut at equal intervals, with the cut positions located between two adjacent single-piece protective materials m1, to form the leg openings of the diaper. S5. Cut the product obtained in step S4 to obtain independent diaper products; the cutting line L falls on the single protective material m1 so that the cut single protective material m1 forms the front leak-proof protective barrier and the back leak-proof protective barrier of two adjacent single diaper products. The distance between two adjacent tangent lines L is L2, L1 is less than L2, and the longitudinal ends of the single-piece absorbent core do not contact the tangent lines L.

[0013] Preferably, in the step S3, the leak-proof barrier material is applied with glue by roller gluing to form a roller-glued section. The shape of the roller-glued section is an "H" shape distributed longitudinally. The tangent line L is located on the horizontal line of the "H" shape. After cutting, the front leak-proof barrier and the rear leak-proof barrier formed have an adhesive part with glue and a free part without glue.

[0014] Preferably, the opening sizes at the upper and lower ends of the "H" shape structure of the roller-glued section are different. The opening of the front leak-proof barrier formed after cutting is larger than that of the rear leak-proof barrier.

[0015] Preferably, in the step S2, an intermittent glue application section is provided at the bottom of the leak-proof side edge material. The longitudinal length of the intermittent glue application section is L3, and L1 < L3 < L2. The intermittent glue application section extends into the single-piece barrier materials m1 on both sides.

[0016] By adopting the foregoing technical solutions, the beneficial effects of the present invention are as follows: In this technical solution, from the perspective of the product, a linkage mechanism of the leak-proof side edge and the front and rear barriers is adopted to break through the limitation of the static fitting of the traditional front and rear end barriers. By placing the free part of the front / rear leak-proof barrier on the upper surface of the longitudinally penetrating leak-proof side edge, when worn, the side edge stands up automatically to trigger the formation of the pocket part, achieving a leak-proof effect of "effective when worn"; the front pocket part accurately intercepts the impact of the urine of baby boys and the front leakage caused by the forward-leaning posture, and the rear pocket part effectively holds the urine flowing to the buttocks when lying flat / leaning back, completely eliminating the leakage dead corner of "the end point of the side edge - the waist end"; thus, a three-dimensional protection structure is constructed, upgrading the two-dimensional plane protection to a wrapped three-dimensional seal. The structural design is simple and efficient, and the function can be realized only by "placing" connection, simplifying the process and reducing the cost. At the same time, it avoids the risk of勒痕 caused by multiple elastic structures; the pocket part can also adaptively deform with the movements of the baby such as turning over and crawling, dynamically fitting the waist and hip curves, continuously maintaining the sealing property, taking into account the comfort experience while enhancing the protection stability in the activity scenario, and systematically solving the pain points of front and rear leakage; It should be noted that the "勒痕" in the original text seems to be incorrect or an incomplete expression. I have translated it as "勒痕" for now, but it may need to be corrected according to the actual situation.In production, the single-piece protective material m1 is reused across products, and the absorbent core is precisely short-cut to achieve dual optimization of process and structure. After arc cutting and slitting, the single-piece protective material m1 simultaneously forms the front / back leak-proof protective barriers of two adjacent diapers (the tail end of the front piece = the head end of the back piece). This eliminates the multiple processes of independent gluing, positioning, and bonding of the front and back barriers in the traditional process, reducing the complexity of equipment stations and vision positioning systems. Mass production can be achieved with only minor adjustments to the slitting logic on the existing production line, reducing changeover time by about 30%. Furthermore, the absorbent core length L1 is strictly less than the slitting interval L. 2. The end avoids the slit line, ensuring that the core only covers the functional core area, avoiding the ineffective extension of the traditional through-type core at the longitudinal end (the end has no absorption requirement but consumes 15% to 20% of the core material). This significantly reduces the raw material cost of the core of a single diaper, while also reducing the thickness at the end and improving the softness and fit of the waistband. The core end maintains a safe distance from the slit line, eliminating the risk of core fibers scattering or shifting during slitting. The protective material bears the main body of the end structure, ensuring that the base of the pocket is flat and burr-free, providing a reliable physical basis for the subsequent dynamic linkage of the "sidewall-protective material", and ensuring structural integrity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the unfolded structure of a diaper according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the distribution structure of the absorbent core of the diaper according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the stacked structure of the absorber core in an embodiment of the present invention.

[0020] Figure 4 This is a process flow diagram of the diaper according to an embodiment of the present invention.

[0021] Reference numerals: 1. Permeable top layer; 2. Absorbent core; 2a. Upper core; 2b. Lower core; 3. Impermeable bottom layer; a. Front waist side; b. Rear waist side; 4. Leak-proof partition; 41. Interval adhesive application section; 5a. Front leak-proof barrier; 5b. Rear leak-proof barrier; 51. Adhesive section; 52. Free section; 53. Roll adhesive section; 6. Diversion layer. Detailed Implementation

[0022] 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. Example

[0023] refer to Figure 1 , Figure 2 and Figure 3A multi-layer composite leak-proof high-permeability diaper includes a liquid-permeable surface layer 1, an absorbent core 2, and a liquid-impermeable bottom layer 3 stacked from top to bottom. The length direction of the diaper is defined as longitudinal, and the width direction is defined as transverse. According to the position when the body wears it, it is divided into front waist side a, crotch area and back waist side b. The liquid-permeable surface layer 1 is provided with leak-proof partitions 4 that extend longitudinally and are symmetrically arranged transversely. Each of the leak-proof partitions 4 extends to the two ends of the longitudinal direction of the diaper. The front waist side a and the back waist side b are respectively provided with a front leak-proof guard 5a and a back leak-proof guard 5b that extend transversely. The absorbent core 2 includes an upper core 2a and a lower core 2b stacked together. The upper core 2a extends from the front waist side a to the back waist side b, and extends to the front leak guard 5a and the back leak guard 5b. The lower core 2b extends from the crotch area to the back leak guard 5b. Specifically, both the front leak guard 5a and the back leak guard 5b include an adhesive portion 51 bonded to the longitudinal end of the diaper and a free portion 52 mounted on the upper surface of the two leak guards 4. The adhesive portion 51 on the back leak guard 5b is U-shaped with its opening facing the center of the diaper. For the back waist side b, the U-shaped contour forms a "groove-like" base at the longitudinal end of the diaper. When the free portion 52 is lifted by the leak guards 4, it together with the two side guards forms a bowl-shaped three-dimensional cavity (non-planar opening), significantly increasing the pocket volume. Furthermore, the U-shaped opening naturally guides the intercepted urine / stool back to the center of the diaper, accelerating its flow into the absorbent core 2 and avoiding the risk of side spillage caused by liquid stagnation at the edge of the pocket; when the baby rolls over or moves their legs, the U-shaped structure provides elastic deformation space to buffer the impact of the liquid (such as the instantaneous impact of a male infant's urine) and prevent the pocket from "overflowing" due to excessive instantaneous flow. The free portion 52 of the front leak-proof guard 5a has an isosceles trapezoidal structure, with its width gradually increasing from the end of the diaper inwards. This design expands the effective interception surface. The trapezoidal design makes the pocket opening (the wider inner end) significantly larger than the end connection, creating a "trumpet mouth" effect and improving the liquid capture rate, especially for leaks where urine spreads obliquely along the groin. Furthermore, the trapezoidal sloping side smoothly transitions to the longitudinally extending leak-proof partition 4, completely eliminating the structural break point between the "partition end point and pocket start point" (a common leak dead angle in traditional designs), achieving a 360° continuous protective closed loop.

[0024] When the diaper is worn, the front leak guard 5a and the rear leak guard 5b, together with the two leak-proof partitions 4, stand up to form pockets located at both ends of the diaper's longitudinal direction. This technical solution adopts a three-in-one dynamic leak-proof mechanism of "partitions-guards-core". The standing leak-proof partitions 4 not only form a side leak-proof barrier, but also actively trigger the formation of the front and rear pockets, achieving an intelligent seal that is "effective as soon as it is worn", completely eliminating the leakage dead zone from "the end of the partition to the waistband end" in traditional designs; the pockets and the upper core 2a are deeply coupled in an extended design: the liquid intercepted by the pockets can be immediately absorbed and guided by the upper core 2a that extends to the base of the guards, preventing liquid from accumulating and overflowing in the pockets; On the absorbent core 2, a gradient absorption system of "sparse on top and dense on the bottom, with guidance in the front and locking in the back" is constructed. The upper core 2a extends in full coverage: as a high-permeability guiding layer 6, it allows urine (especially the impact area on the front waist a) to spread rapidly laterally, improving overall permeability efficiency and reducing surface retention. The lower core 2b is precisely anchored on the back waist b: in response to the physiological characteristics of urine flowing backward due to gravity and continuous pressure on the buttocks when lying flat, highly water-locking materials are concentrated in the main pressure areas, significantly improving pressure resistance and water-locking ability, and inhibiting pressure osmosis and back osmosis from the root. The front waist a is not designed with the lower core 2b: to avoid abdominal pressure discomfort caused by excessive thickness in the front, taking into account both comfort and functional precision. In this embodiment, a flow guiding layer 6 is provided on the upper surface of the upper core 2a, extending from the front waist side a to the groin area. The flow guiding layer 6 is only provided on the front waist side a to the groin area to accelerate urine diffusion and prevent fluid accumulation in high-incidence areas; it is not provided on the rear side to ensure close contact between the upper and lower cores 2b on the rear waist side b, avoiding interference with the transfer of liquid to the lower core 2b.

[0025] In the design, the upper core 2a is composed of fluff pulp and an upper layer of SAP, while the lower core 2b is composed of a lower layer of SAP, creating a layered material design. The upper core 2a (fluff pulp + upper layer SAP) is loose and facilitates flow, while the lower core 2b (pure lower layer SAP) is highly dense and locks in water, reinforcing the "loose upper, dense lower" gradient and improving the infiltration rate and water-locking stability. Specifically, the upper layer SAP is selected from 60-150 mesh, and the lower layer SAP is selected from 20-40 mesh. The upper layer SAP (60-150 mesh, fine particles) has a large specific surface area and fast absorption rate, suitable for flow guidance requirements; the lower layer SAP (20-40 mesh, large particles) has high gel strength and is specifically designed for pressure-resistant water-locking, with parameters precisely matched to functional zones. Furthermore, the lower core 2b can be made of fluffy hot-air nonwoven fabric as a base to maintain internal pores under pressure, preventing the SAP from being compacted and failing, and ensuring water-locking stability.

[0026] In this technical solution, the front pocket and the upper core 2a extended structure can effectively cope with the impact of urine from male infants and leakage when they are leaning forward; while the rear pocket and the lower core 2b extended structure can catch the urine flowing backward and absorb it immediately by the high water-locking layer, which is specifically designed to prevent leakage when lying down. The design forms a closed loop path of "dynamic pocket interception + upper core 2a fast conduction + lower core 2b deep locking", which greatly improves the single absorption capacity and water-locking stability, while keeping the surface dry.

[0027] The following processes are used in the production process: refer to Figure 4 and combined Figures 1 to 3 The preparation method for a high-permeability diaper product with anti-leakage front and back includes the following steps: S1. Take the impermeable bottom layer material 3 and continuously transport it. Arrange the single absorbent core 2 on the impermeable bottom layer material in sequence. Define the transport direction as longitudinal, the material width direction as transverse, and the length of the single absorbent core 2 as L1. S2. Take the liquid-permeable surface layer 1 material and the leak-proof partition 4 material respectively and continuously convey them. After applying adhesive to the bottom of the leak-proof partition 4 material, it is symmetrically arranged on the liquid-permeable surface layer 1 material in the transverse direction. S3. The leak-proof enclosure material is continuously conveyed, and after partial adhesive application to the bottom, it is cut into single pieces of enclosure material m1. These pieces are then evenly spaced along the upper surface of the liquid-permeable surface layer 1, covering the upper surface of the leak-proof partition 4 material. The leak-proof enclosure material is then glued to form a glued section 53. The shape of the glued section 53 is an "H" shape distributed longitudinally. The cutting line L is located on the horizontal line of the "H" shape. After cutting, the resulting front leak-proof enclosure 5a and rear leak-proof enclosure 5b form an adhesive bonding portion 51 and a free portion 52 without adhesive. This innovative "H"-shaped glued section 53 design deeply integrates the adhesive application method with the product function. Precise definition of functional areas: In the longitudinal "H"-shaped structure of the glue-rolling section 53, the vertical lines on both sides correspond to the glue application area of ​​the adhesive part 51, and the horizontal line in the middle is the cutting baseline; after cutting, the adhesive part 51 retains the glue layer to achieve a firm bond at the end, and the glue-free area of ​​the free part 52 maintains the original softness and elasticity of the material, ensuring that the free part 52 can be lifted without resistance when the side is raised during wear, avoiding deformation failure of the pocket caused by the hardening of the glue layer; Process economy and flexibility: Compared with spraying, the roller coating process reduces glue atomization waste (more than 25% reduction in glue consumption), and the glue amount is uniform and controllable; the roller coating mold can be quickly changed to adapt to different sizes of products (such as NB / S / M sizes), without the need for machine downtime reprogramming, reducing debugging time by 50%, and eliminating the pain points of nozzle clogging maintenance, which greatly improves the flexibility of the production line and OEE (overall equipment efficiency). Improved quality and stability: The edges of the adhesive are sharp and clear, eliminating the common defects of "adhesive halo" and "tail" in adhesive spraying, preventing adhesive from seeping into the free part and affecting elasticity, and ensuring the consistency of the pocket function of each product.

[0028] Specifically, according to the above product design, the openings at the top and bottom of the "H"-shaped structure of the roller molding section 53 are different sizes, and the opening of the front leak-proof guard 5a formed after cutting is larger than the opening of the rear leak-proof guard 5b. The asymmetrical design of the upper and lower openings of the H"-shaped roller molding section 53 (upper opening > lower opening) enables function-oriented precision manufacturing. Ergonomic features implemented: After being cut, the front leak guard 5a forms a large opening structure (matching the trapezoidal free part 52 + U-shaped adhesive part 51), which expands the interception surface of the front pocket and effectively copes with the impact of male infants' urine and forward tilting leakage; the rear leak guard 5b forms a small opening structure, optimizes the fit of the lower back, reduces friction during hip movement, and maintains sufficient pocket capacity to cope with rear leakage when lying down. Structural innovation is achieved with zero increase in process burden: Without the need to add independent molds or secondary processing, differentiated front and rear guards can be produced simultaneously in continuous production by simply adjusting the opening size of the rolling mold. The structural advantages of the designed product are "embedded" into the manufacturing process, achieving a seamless transformation of "design-process". Adaptable to gender and scenario requirements: Mold parameters can be further customized (e.g., the front opening of the baby boy version can be increased by 10%), providing a low-cost technical path for product line segmentation and strengthening market competitiveness; S4. After covering the liquid-permeable surface layer 1 material on top of the product obtained in step S1, the layers are laminated into one piece. The obtained product is then cut at equal intervals with the cut positions located between two adjacent single-piece protective materials m1 to form the leg openings of the diaper. S5. Cut the product obtained in step S4 to obtain independent diaper products; the cutting line L falls on the single protective material m1 so that the cut single protective material m1 forms the front leak-proof protective barrier 5a and the rear leak-proof protective barrier 5b of two adjacent single diaper products. The distance between two adjacent tangent lines L is L2, L1 is less than L2, and the longitudinal ends of the single-piece absorbent core 2 do not contact the tangent lines L. During production, the single-piece crotch guard material m1 is reused across products and precisely short-cut with the absorbent core 2 to achieve double optimization of process and structure. After arc cutting and slitting of the single-piece crotch guard material m1, the front / rear leak-proof crotch guards 5b of two adjacent diapers are synchronously formed (the front end of the front piece = the front end of the rear piece), eliminating multiple processes such as independent gluing, positioning, and fitting of the front and rear crotch guards in the traditional process, reducing the complexity of the equipment stations and the vision positioning system. Only the slitting logic needs to be slightly adjusted on the existing production line for mass production, and the changeover time is shortened by about 30%; moreover, the length L1 of the absorbent core 2 is strictly less than the slitting distance L2, and the end avoids the slitting line, so that the core only covers the functional core area, avoiding the ineffective extension of the traditional through-type core at the longitudinal end (no absorption is required at the end but 15% - 20% of the core material is consumed). The raw material cost of the single-piece diaper core is significantly reduced, and at the same time, the end thickness is reduced and the softness and fit of the waist circumference are improved; the safe distance between the core end and the slitting line is maintained to eliminate the risk of fiber scattering or displacement of the core during slitting; the crotch guard material forms the main body of the end structure, ensuring that the bottom of the crotch is flat and free of burrs, providing a reliable physical basis for the subsequent "seamless-crotch guard" dynamic linkage, and the structural integrity is guaranteed.

[0029] Furthermore, an intermittent gluing section 41 is provided at the bottom of the leak-proof seamless material 4. The longitudinal length of the intermittent gluing section 41 is L3, and L1 < L3 < L2. The intermittent gluing section 41 extends into the single-piece crotch guard materials m1 on both sides. By defining the length L3 of the intermittent gluing section 41 (satisfying L1 < L3 < L2) and extending it into the crotch guard material, a "glue-structure" collaborative fixing system is constructed: the seamless is only glued in the central key area (L3 covers the functional area), and the glue-free design at the end reduces the glue consumption by 15% - 20%, significantly reducing the raw material cost; at the same time, it avoids the problems of reduced air permeability and stiff hand feeling caused by the accumulation of the glue layer at the end, improves the skin-friendly softness of the waist circumference end, reduces the risk of skin friction and irritation, and achieves a win-win situation for glue consumption and comfort; although there is no direct gluing at the end of the seamless, the single-piece crotch guard material m1 covered by extension is secondarily press-fixed through its bonding part 51, forming a double guarantee of "crotch guard wrapping + end anchoring", effectively resisting the warping or displacement of the seamless end during wearing, ensuring the sealing integrity of the crotch, and designing structural redundancy to enhance reliability; and the intermittent gluing shortens the glue drying path, improving the production line speed; and it is deeply coupled with the process logic of crotch guard slitting, enabling the crotch guard material to naturally perform the function of fixing the seamless end, reflecting the green manufacturing concept of "using structure instead of glue volume" and achieving process synergy and efficiency improvement.

[0030] This technical solution constructs a highly efficient, low-cost, and highly reliable intelligent manufacturing process system for diapers, encompassing both product design and mass production processes. The two are deeply coupled, achieving significant reductions in overall production costs per diaper, from material savings (core shortening and glue quantity optimization) and process simplification (reusable guards and roller gluing instead of spray gluing) to quality improvement (precise structure and no glue interference). This ensures the implementation of high-end leak-proof functions while achieving cost reduction and efficiency improvement across the entire supply chain. Reduced glue and core material consumption aligns with sustainable development trends, and the rapid changeover capability of roller gluing molds supports small-batch customized production, meeting diverse market demands. Process optimization directly addresses end-user pain points—improved end softness for comfort, precise structure for leak-proof reliability, and material savings without sacrificing functionality, truly achieving a technological breakthrough where "low cost ≠ low quality."

[0031] It should be noted that, since these are not innovative aspects of this technical solution, this technical solution does not describe essential components of the diaper such as waist tabs and elastic waistbands.

[0032] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A high-permeability diaper with front and back leakage prevention, comprising a liquid-permeable top layer (1), an absorbent core (2), and a liquid-impermeable bottom layer (3) stacked from top to bottom, wherein the length direction of the diaper is defined as longitudinal, the width direction as transverse, and it is divided into a front waist side (a), a crotch area, and a back waist side (b) according to the position when worn by the human body, characterized in that: The liquid-permeable surface layer (1) is provided with leak-proof partitions (4) that extend longitudinally and are symmetrically arranged laterally. Each of the leak-proof partitions (4) extends to the longitudinal ends of the diaper. The front waist side (a) and the back waist side (b) are respectively provided with a front leak-proof guard (5a) and a back leak-proof guard (5b) that extend laterally. The front leak-proof guard (5a) and the back leak-proof guard (5b) each include an adhesive part (51) that is bonded to the longitudinal end of the diaper and a free part (52) that is mounted on the upper surface of the two leak-proof partitions (4). When the diaper is worn, the free part (52) stands up with the two leak-proof partitions (4) and forms a pocket at both longitudinal ends of the diaper. The longitudinal ends of the absorbent core (2) extend into the pocket and do not contact the adhesive portion (51) of the two pockets.

2. A high-permeability diaper with anti-leakage front and back leak protection according to claim 1, characterized in that: The absorbent core (2) includes an upper core (2a) and a lower core (2b) stacked together. The upper core (2a) extends from the front waist side (a) to the back waist side (b) and extends to the front leak guard (5a) and the rear leak guard (5b). The lower core (2b) extends from the crotch area to the rear leak guard (5b).

3. A high-permeability diaper with anti-leakage front and back leak protection according to claim 1, characterized in that: The upper surface of the absorbent core (2) is provided with a flow guide layer (6), which extends from the front waist side (a) to the crotch.

4. A high-permeability diaper with anti-leakage front and back leak protection according to claim 1, characterized in that: The adhesive part (51) is U-shaped with the opening facing the center of the diaper.

5. A high-permeability diaper with anti-leakage front and back leak protection according to claim 1, characterized in that: The free part (52) has an isosceles trapezoidal structure, and its width gradually increases from the end of the diaper inward.

6. A method for preparing a high-permeability diaper with anti-leakage front and back leak protection according to claim 1, characterized in that, Includes the following steps: S1. Take the impermeable bottom layer (3) material and continuously transport it. Arrange the single absorbent core (2) on the impermeable bottom layer material in sequence. Define the transport direction as longitudinal, the material width direction as transverse, and the length of the single absorbent core (2) as L1. S2. Take the liquid-permeable surface layer (1) material and the leak-proof partition (4) material respectively and continuously transport them. After applying glue to the bottom of the leak-proof partition (4) material, it is symmetrically arranged on the liquid-permeable surface layer (1) material in the transverse direction. S3. Take the leak-proof protective material and continuously convey it. After applying glue to the bottom part, cut it into single protective material m1. Then, arrange it at equal intervals along the upper surface of the liquid-permeable surface layer (1) and cover the upper surface of the leak-proof partition (4) material. S4. After covering the liquid-permeable surface layer (1) material on the product obtained in step S1, the layers are stacked and composited into one piece. The obtained product is then cut at equal intervals, with the cut position located between two adjacent single protective materials m1, to form the leg opening of the diaper. S5. Cut the product obtained in step S4 to obtain independent diaper products; the cutting line L falls on the single protective material m1 so that the cut single protective material m1 forms the front leak-proof protective barrier (5a) and the back leak-proof protective barrier (5b) of two adjacent single diaper products. The distance between two adjacent tangent lines L is L2, L1 is less than L2, and the longitudinal ends of the single-piece absorbent core (2) do not contact the tangent lines L.

7. A method for preparing a high-permeability diaper with anti-leakage front and back leaks according to claim 6, characterized in that: In the step S3, the leak-proof flank material is applied with adhesive through roll gluing to form a roll-glued section (53). The shape of the roll-glued section (53) is an "H" shape distributed longitudinally. The tangent line L is located on the horizontal line of the "H" shape. After cutting, the front leak-proof flank (5a) and the rear leak-proof flank (5b) formed have an adhesive bonding part (51) and a free part (52) without adhesive.

8. A method for preparing a high-permeability diaper with anti-leakage front and back leak protection according to claim 7, characterized in that: The sizes of the openings at the upper and lower ends of the "H" shape structure of the roll-glued section (53) are different. The opening of the front leak-proof flank (5a) formed after cutting is larger than the opening of the rear leak-proof flank (5b).

9. A method for preparing a high-permeability diaper with anti-leakage front and back leak protection according to claim 6, 7, or 8, characterized in that: In the step S2, an intermittent adhesive application section (41) is provided at the bottom of the leak-proof side edge (4) material. The longitudinal length of the intermittent adhesive application section (41) is L3, and L1 < L2 < L3. The intermittent adhesive application section (41) extends into the single-piece flank materials m1 on both sides.

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