High-absorbing water-retaining composite core and preparation method thereof

Abstract

The application discloses a high-absorption water-locking composite core body, comprising a quick-absorption flow guide layer, a gradient diffusion layer, a double-effect absorption and locking integrated layer, a strong water-locking layer and a leakage-proof setting base, and discloses a preparation method of the high-absorption water-locking composite core body, comprising the following steps: S1, raw material pretreatment; S2, quick-absorption flow guide layer treatment; S3, gradient diffusion layer preparation; S4, double-effect absorption and locking integrated layer preparation; S5, strong water-locking layer and whole core body compounding; S6, leakage-proof setting base compounding; S7, whole compounding and setting; S8, detection and packaging; the application adopts a five-layer composite structure and flow guide micro-grooves, and is matched with a three-dimensional gradient diffusion layer, can quickly direct and conduct, uniformly disperses liquid, and improves absorption efficiency and utilization; the double-effect absorption and locking layer is an upper-lower asymmetric structure, realizes millisecond-level liquid capture, downward infiltration and pre-water-locking by means of fiber three-dimensional entanglement self-locking and glue-free blocking, blocks back infiltration, solves problems of uneven absorption, large back infiltration and the like of a traditional core body, and significantly improves dryness.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, and in particular to a highly absorbent and water-locking composite core and its processing method. Background Technology

[0002] The highly absorbent and water-locking composite core is a core component of sanitary products such as sanitary napkins, panty liners, and nursing pads, directly determining the absorption speed, water-locking effect, and wearing comfort. Existing composite cores mostly employ traditional multi-layer structures, which generally suffer from slow absorption rates, uneven liquid diffusion, and localized saturation, leading to surface seepage and noticeable dampness and discomfort.

[0003] Most core materials employ a vertical support structure, resulting in weak resistance to pressure and deformation. After absorbing liquid, they are prone to collapse and delamination, causing internal pore blockage and a significant decrease in continuous absorption capacity. Materials primarily consist of conventional fibers, absorbent resins, and single antibacterial components, offering limited skin-friendliness, biocompatibility, and long-lasting antibacterial effects. Interlayer bonding often relies on adhesives, which can create conductive barriers and increase the product's bulkiness. Traditional anti-leakage edge protection only provides simple straight-edge physical interception, with a single flow path, failing to achieve efficient liquid collection and return, thus maintaining a high risk of side leakage. Therefore, this invention proposes a high-absorption, water-locking composite core and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-absorption, water-locking composite core and its preparation method.

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

[0006] A high-absorption and water-locking composite core comprises, from top to bottom, a five-layer composite structure consisting of a fast-absorption and flow-guiding layer, a gradient diffusion layer, a dual-effect absorption and locking integrated layer, a strong water-locking layer, and a leak-proof shaping base.

[0007] A multi-dimensional three-dimensional support skeleton is evenly distributed between the gradient diffusion layer, the dual-effect suction and locking integrated layer, and the strong water-locking layer. The multi-dimensional three-dimensional support skeleton runs through the three functional cores in an oblique and intersecting manner. The top end is engaged and fixed with the bottom surface of the fast-absorption and diversion layer, and the bottom end is flexibly connected with the leak-proof shaping base and a deformation buffer space is reserved. An interpenetrating network gel water-locking structure is formed inside the strong water-locking layer. The edge of the leak-proof shaping base and the edge of each layer of the composite core are integrally formed by hot-melt sealing.

[0008] Preferably, the rapid absorption and diversion layer is a 0.12–0.18 mm hydrophilic nonwoven fabric with a basis weight of 16–22 g / m² and a water contact angle ≤25°; the surface is formed with diversion microgrooves, the groove depth is 0.09–0.12 mm, the width is 0.11–0.14 mm, the density is 16–22 grooves / cm, and the groove depth increases from the center to the edge; the top surface is covered with a 3–6 nm aloe polysaccharide repair coating, the coating molecular particle size is ≤50 nm, and it is uniformly loaded on the surface of the nonwoven fabric fibers.

[0009] Preferably, the gradient diffusion layer has a thickness of 0.15–0.25 mm, the fiber pores are distributed in a three-dimensional gradient, and there is no adhesive layer between the layers, which can rapidly diffuse and conduct liquid in three dimensions, eliminating local liquid accumulation and surface retention.

[0010] Preferably, the dual-effect suction and locking integrated layer is an asymmetrical double-layer composite structure, with the upper layer being an instant liquid-capturing layer and the lower layer being a pre-water-locking transition layer, with an overall thickness of 0.30–0.40 mm. The upper layer fibers are filled with through-hole hollow micropores, with microspheres embedded in the fiber gaps, achieving millisecond-level liquid capture and directional seepage. The lower layer forms a semi-interpenetrating network slow-locking structure, which can quickly receive liquid and initially lock in water, preventing liquid from seeping back upward.

[0011] Preferably, the upper and lower layers of the dual-effect suction and locking integrated layer are not bonded with glue, but form an integrated structure through three-dimensional fiber interlacing and self-locking; the porosity of the upper layer is greater than that of the lower layer, forming a suction and locking gradient that tightens from top to bottom, enabling unidirectional liquid conduction, rapid infiltration, and no backflow.

[0012] Preferably, the strong water-locking layer has a thickness of 0.30–0.45 mm, and after absorbing liquid, it forms a stable interpenetrating network gel structure that does not backflow, leak, or collapse under pressure.

[0013] Preferably, the leak-proof shaping substrate is a 0.08–0.12 mm composite membrane, with a 5–12 nm nano zinc oxide antibacterial layer on the inner side. The antibacterial particles have a particle size ≤20 nm and are uniformly distributed on the inner side of the membrane. The water repellency level is ≥5, and the width of the sealing shaping edge is 1.6–2.2 mm.

[0014] Preferably, the multi-dimensional three-dimensional support skeleton has a diameter of 0.12–0.22 mm, with 110–130 skeletons distributed per 10 cm²; a deformation buffer gap of 0.06–0.12 mm is reserved between the support skeleton and the leak-proof shaping base; a small amount of water-based adhesive is used for positioning around the support skeleton, with an adhesive amount ≤0.6 g / m², which can prevent the core from collapsing, delaminating, or misaligning after absorbing liquid.

[0015] Preferably, the gradient diffusion layer has an integrally formed arc-shaped, wrap-around anti-leakage baffle with a height of 0.35–0.45 mm and a width of 0.55–0.65 mm, which is seamlessly connected to the gradient diffusion layer; together with the rapid absorption and guiding layer, it forms an arc-shaped guiding slope with a low center and a high edge, which can form a wrap-around interception of the edge liquid and guide it back to the core.

[0016] A method for preparing a high-absorption, water-locking composite core includes the following steps:

[0017] S1. Raw material pretreatment: Plasma surface modification is performed on hydrophilic and hydrophobic nonwoven fabrics to enhance fiber surface activity and interlayer bonding; pineapple leaf fiber and palm hard fiber are sequentially opened, impurity removed, combed, and dried to ensure clean and dry fibers; attapulgite particles, diatomaceous earth microspheres, and polyglutamic acid resin are graded, sieved, and activated to improve material uniformity and reactivity; a nano-cellulose whisker aqueous dispersion is prepared simultaneously and sealed for later use.

[0018] S2. Rapid absorption and diversion layer treatment: Diversion micro-grooves are pressed on the surface of hydrophilic non-woven fabric to enhance the ability of liquid to conduct and disperse quickly; Aloe polysaccharide repair coating is uniformly sprayed on the surface of non-woven fabric and dried at low temperature to make the coating adhere firmly, thus completing the forming and stabilization of the rapid absorption and diversion layer.

[0019] S3. Preparation of gradient diffusion layer: Pineapple leaf modified fiber and attapulgite composite water-absorbing particles are thoroughly mixed and uniformly laid into a mesh to form a loose and conductive substrate; nanocellulose whisker aqueous dispersion is sprayed on the surface of the mesh layer for in-situ cross-linking and reinforcement, so that the fiber pores are distributed in a three-dimensional gradient and a stable gradient diffusion structure is obtained.

[0020] S4. Preparation of the dual-effect suction and locking integrated layer: Konjac glucomannan modified fiber is mixed with porous diatomaceous earth water-absorbing microspheres to form the upper instant absorption structure, and xanthan gum crosslinked modified fiber is mixed with plant-based low crosslinked flexible water-locking particles to form the lower pre-locking structure; the upper and lower fibers are three-dimensionally interwoven and self-locked, forming an integrated dual-layer suction and locking core without glue.

[0021] S5. The strong water-locking layer is combined with the overall core. The palm hard fiber and polyglutamic acid high-concentration water-locking resin are fully mixed and evenly spread into a mesh to obtain the strong water-locking layer. The strong water-locking layer and the dual-effect suction and locking integrated layer are precisely aligned and stacked. After low-temperature hot pressing, the multi-dimensional three-dimensional support skeleton is diagonally interwoven through the three-layer functional core to ensure the overall structure is stable and does not separate.

[0022] S6. Leak-proof and shaping base composite: Modified polylactic acid breathable membrane and hydrophobic non-woven fabric are hot-melt composite to form a seepage-proof base. A nano zinc oxide antibacterial layer is evenly sprayed on the inner side of the base to improve the long-term antibacterial performance. The composite base is precisely bonded to the strong water-locking layer. A small amount of adhesive is applied around the multi-dimensional three-dimensional support skeleton for fixation, and an elastic deformation buffer gap is reserved.

[0023] S7. The overall composite molding process combines the fast-absorbing and guiding layer with the gradient diffusion layer without glue to ensure smooth liquid conduction. An arc-shaped anti-leakage baffle is integrally formed at the edge of the core, and the overall edge is heat-sealed in one piece. Then, it is precisely laser-cut and trimmed according to the design dimensions.

[0024] S8. Testing and Packaging: Key indicators such as the thickness, liquid absorption rate, reverse seepage, water-locking strength, and leak-proof performance of the core product are tested item by item; qualified products are screened and sterilized by low-temperature plasma, and then individually vacuum-packed to complete the finished product preparation.

[0025] The present invention has the following beneficial effects:

[0026] 1. This invention adopts a five-layer composite structure and a composite flow-guiding micro-groove design, combined with a three-dimensional gradient diffusion layer, which can quickly conduct and uniformly disperse liquid, significantly improving liquid utilization and absorption rate. The dual-effect suction and locking integrated layer adopts an asymmetrical double-layer structure, which is formed by three-dimensional interlacing and entanglement of fibers, without the obstruction of adhesive layer, to achieve millisecond-level liquid capture, directional seepage and preliminary water locking, and block liquid backflow. It effectively solves the problems of uneven absorption, surface retention and large backflow of traditional cores, and greatly improves the dryness of use.

[0027] 2. The core is supported by a multi-dimensional, diagonally interwoven, three-dimensional support frame. Combined with deformation buffer gaps, it can maintain the smooth flow of internal pores under pressure, preventing the core from collapsing, delaminating, or misaligning. This significantly improves the structural stability and pressure resistance. The strong water-locking layer adopts an interpenetrating network gel structure, which has strong water-locking ability and does not collapse under pressure. Combined with the arc-shaped, wrap-around anti-leakage baffle, it forms a wrap-around interception and diversion backflow, structurally eliminating side leakage. The whole structure is thin, light, and long-lasting, making it suitable for various dynamic usage scenarios.

[0028] 3. Adopting a brand-new bio-based and plant-based material system, combined with a nano zinc oxide antibacterial layer and a skin-friendly repair coating, it is gentle on the skin, has good biocompatibility, and has long-lasting antibacterial and skin-soothing effects. Unlike traditional materials that are highly irritating and have only one antibacterial effect, the interlayer adopts an integrated process of glue-free interlocking and hot-melt sealing, reducing the obstruction and heaviness of the adhesive layer, improving the overall softness and fit, and significantly improving the comfort and product safety while enhancing the absorption and water-locking performance. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the structure of a high-absorption, water-locking composite core proposed in this invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of a high-absorption, water-locking composite core proposed in this invention.

[0031] In the diagram: 1. Rapid suction and flow guiding layer; 2. Gradient diffusion layer; 3. Dual-effect suction and locking integrated layer; 4. Strong water-locking layer; 5. Leak-proof shaping base; 6. Multi-dimensional three-dimensional support skeleton; 7. Flow guiding micro-grooves. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Example 1: Daily Use Slim Type

[0034] This embodiment is primarily designed for basic usage scenarios such as light menstrual flow, daily discharge care during non-menstrual periods, daily commutes, office work, and outings. It is designed for users with moderate daily activity levels, light menstrual flow / discharge, and a preference for lightweight, breathable, and long-lasting dry comfort. The core is thin, soft, and fits snugly without being bulky. It absorbs quickly, spreads evenly, and has low backflow, ensuring comfortable wear for extended periods without feeling stuffy, damp, or leaking. It is compatible with daily sanitary napkins, lightweight panty liners, and other products, balancing comfort, hygiene, and portability, making it a mainstream core for daily feminine care.

[0035] S1. Raw material pretreatment: Hydrophilic and hydrophobic nonwoven fabrics are subjected to 280W plasma surface modification for 4 minutes to enhance fiber surface activity and interlayer bonding; Pineapple leaf fiber and palm hard fiber are sequentially opened, impurity removed, combed, and dried at 55℃ for 25 minutes to ensure fiber cleanliness and dryness; Attapulgite particles, diatomaceous earth microspheres, and polyglutamic acid resin are subjected to 120-mesh grading and 95℃ activation for 15 minutes to improve material uniformity and reactivity; Simultaneously, a 1.5wt% nanocellulose whisker aqueous dispersion is prepared and sealed for later use.

[0036] S2. Treatment of the fast-absorbing and diffusing layer 1: Diffusing microgrooves 7 are pressed on the surface of the hydrophilic nonwoven fabric at 105℃ and 0.12MPa to enhance the ability of liquid to conduct and disperse quickly; Aloe polysaccharide repair coating is uniformly sprayed on the surface of the nonwoven fabric and dried at 60℃ for 10min to make the coating adhere firmly, thus completing the molding and stabilization of the fast-absorbing and diffusing layer 1.

[0037] S3, Gradient diffusion layer 2 preparation: Pineapple leaf modified fiber and attapulgite composite water-absorbing particles are thoroughly mixed at a ratio of 6:4 and then uniformly spread into a mesh to form a loose and conductive substrate; 5 g / ㎡ nanocellulose whisker aqueous dispersion is sprayed on the surface of the mesh layer and in-situ crosslinked at 65℃ for 8 min to strengthen it, so that the fiber pores are distributed in a three-dimensional gradient and a stable gradient diffusion structure is obtained.

[0038] S4. Preparation of the dual-effect suction and locking integrated layer 3: Konjac glucomannan modified fiber and porous diatomaceous earth water-absorbing microspheres are mixed in a 5:5 ratio and laid as the upper instantaneous absorption structure. Xanthan gum crosslinked modified fiber and plant-based low crosslinked flexible water-locking particles are mixed in a 4.5:5.5 ratio and laid as the lower pre-locking structure. The upper and lower fiber layers are hot-pressed at 70℃ for 1.5s to form a three-dimensional interweaving and self-locking structure, forming an integrated dual-layer suction and locking core without glue.

[0039] S5, the strong water-locking layer 4 is combined with the overall core. The palm hard fiber and polyglutamic acid high-concentration water-locking resin are fully mixed at a ratio of 3.5:6.5 and then evenly spread into a mesh to obtain the strong water-locking layer 4. The strong water-locking layer 4 is precisely aligned and stacked with the dual-effect suction and locking integrated layer 3. After being hot-pressed at a low temperature of 75℃ and 0.10MPa for 2s, the multi-dimensional three-dimensional support skeleton 6 is diagonally interwoven through the three functional core layers to ensure the overall structure is stable and does not separate.

[0040] S6, the leak-proof and shaping base 5 is composite, which is formed by hot-melt bonding of modified polylactic acid breathable membrane and hydrophobic non-woven fabric at 95℃ to form a leak-proof base. A nano zinc oxide antibacterial layer is sprayed on the inner side of the base at 0.25MPa to improve the long-term antibacterial performance. The composite base is precisely bonded to the strong water-locking layer 4, and 0.4g / ㎡ of micro-adhesive is applied around the multi-dimensional three-dimensional support skeleton 6 for fixation, and a 0.06mm elastic deformation buffer gap is reserved.

[0041] S7. The overall composite molding process involves bonding the fast-absorption and flow guiding layer 1 and the gradient diffusion layer 2 together at 65°C without glue to ensure smooth liquid conduction. An arc-shaped, wrap-around anti-leakage edge is integrally formed at the edge of the core, and the overall edge is hot-melted and sealed at 100°C. Then, precise laser cutting and trimming are performed according to the design dimensions of 180mm×70mm.

[0042] S8. Testing and Packaging: Key indicators such as the thickness, liquid absorption rate, reverse seepage, water-locking strength, and leak-proof performance of the core product are tested item by item; qualified products are screened and sterilized at 35℃ low temperature plasma for 15 minutes, and then individually vacuum packaged to complete the finished product preparation.

[0043] Example 2: Nighttime Plus Long-Lasting Formula

[0044] This embodiment is primarily designed for high-absorbency, long-lasting protection scenarios such as nighttime sleep, heavy menstrual flow, prolonged bed rest, and sedentary periods. It addresses the issues of frequent nighttime tossing and turning, extended wear time, heavy menstrual flow, and the tendency for back and side leakage. The core boasts a large absorbency capacity, high water-locking strength, and pressure resistance without collapse. The curved, wraparound edge provides all-around liquid interception and backflow guidance, ensuring 8 hours of long-lasting water retention without backflow, side leakage, or shifting. It is compatible with extended-length overnight sanitary napkins, heavy-flow daytime sanitary napkins, and bedridden care sanitary napkins, providing high-intensity absorbency and protection for nighttime and heavy-flow scenarios, enhancing sleep comfort and user safety.

[0045] S1. Raw material pretreatment: Hydrophilic and hydrophobic nonwoven fabrics are subjected to 350W plasma surface modification for 6 minutes to enhance fiber surface activity and interlayer bonding; Pineapple leaf fiber and palm hard fiber are sequentially subjected to opening, impurity removal, carding, and drying at 65℃ for 35 minutes to ensure fiber cleanliness and dryness; Attapulgite particles, diatomaceous earth microspheres, and polyglutamic acid resin are subjected to 100-mesh sieving and activation at 105℃ for 25 minutes to improve material uniformity and reactivity; Simultaneously, a 2.0wt% nanocellulose whisker aqueous dispersion is prepared and sealed for later use.

[0046] S2. Treatment of the fast-absorbing and diffusing layer 1: Diffusing microgrooves 7 are pressed on the surface of the hydrophilic nonwoven fabric at 115℃ and 0.18MPa to enhance the ability of liquid to conduct and disperse quickly; Aloe polysaccharide repair coating is uniformly sprayed on the surface of the nonwoven fabric and dried at 68℃ for 15 minutes to make the coating adhere firmly, thus completing the molding and stabilization of the fast-absorbing and diffusing layer 1.

[0047] S3, Gradient diffusion layer 2 preparation: Pineapple leaf modified fiber and attapulgite composite water-absorbing particles are thoroughly mixed at a ratio of 6:4 and then evenly spread into a mesh to form a loose and conductive substrate; 7 g / ㎡ nanocellulose whisker aqueous dispersion is sprayed on the surface of the mesh layer and in-situ crosslinked at 75℃ for 12 min to strengthen it, so that the fiber pores are distributed in a three-dimensional gradient and a stable gradient diffusion structure is obtained.

[0048] S4. Preparation of the integrated double-effect suction and locking layer 3: Konjac glucomannan modified fiber and porous diatomaceous earth water-absorbing microspheres are mixed in a 5:5 ratio and laid as the upper instantaneous absorption structure. Xanthan gum crosslinked modified fiber and plant-based low crosslinked flexible water-locking particles are mixed in a 4.5:5.5 ratio and laid as the lower pre-locking structure. The fibers of the upper and lower layers are hot-pressed at 80°C for 2.5s to form a three-dimensional interweaving and self-locking structure, forming an integrated double-layer suction and locking core without glue.

[0049] S5, the strong water-locking layer 4 is combined with the overall core. The palm hard fiber and polyglutamic acid high-concentration water-locking resin are fully mixed at a ratio of 3.5:6.5 and then evenly spread into a mesh to obtain the strong water-locking layer 4. The strong water-locking layer 4 is precisely aligned and stacked with the dual-effect suction and locking integrated layer 3. After being hot-pressed at a low temperature of 85℃ and 0.15MPa for 3.5s, the multi-dimensional three-dimensional support skeleton 6 is diagonally interwoven through the three functional core layers to ensure the overall structure is stable and does not separate.

[0050] S6, Leak-proof shaping base 5 composite, modified polylactic acid breathable membrane and hydrophobic non-woven fabric are hot melt composite at 105℃ to form a seepage-proof base, nano zinc oxide antibacterial layer is sprayed on the inner side of the base at 0.35MPa to improve long-term antibacterial performance; the composite base is precisely attached to the strong water-locking layer 4, and 0.55g / ㎡ micro-dot glue is applied around the multi-dimensional three-dimensional support skeleton 6 for fixation, and a 0.12mm elastic deformation buffer gap is reserved;

[0051] S7. The overall composite molding process involves bonding the fast-absorbing and guiding layer 1 and the gradient diffusion layer 2 together at 75°C without glue to ensure smooth liquid conduction. An arc-shaped, wrap-around anti-leakage edge is integrally formed at the edge of the core, and the overall edge is hot-melted and sealed at 110°C. Then, precise laser cutting and trimming are performed according to the design dimensions of 280mm×80mm.

[0052] S8. Testing and Packaging: Key indicators such as the thickness, liquid absorption rate, reverse seepage, water-locking strength, and leak-proof performance of the core product are tested item by item; qualified products are screened and sterilized by low-temperature plasma at 40℃ for 18 minutes, and then individually vacuum-packed to complete the finished product preparation.

[0053] Example 3: Sports Fit

[0054] This embodiment is primarily designed for dynamic physical activities such as yoga, jogging, walking, square dancing, daily activities, and housework. It addresses pain points such as large body movements, easy core displacement, curling, deformation, and leakage during exercise. The core is ultra-thin, flexible, highly elastic, and dynamically stable. The multi-dimensional support frame 6 can adaptively adjust to body deformation, quickly absorbing sudden liquids. Even in dynamic conditions, it remains non-leaky, non-transparent, does not collapse, and does not curl, while being breathable and not stuffy. It is suitable for sports sanitary napkins, close-fitting leak-proof panty liners, and daily care products for people with high activity levels, balancing exercise flexibility with absorbency and protection.

[0055] S1. Raw material pretreatment: Hydrophilic and hydrophobic nonwoven fabrics are subjected to 250W plasma surface modification for 3 minutes to enhance fiber surface activity and interlayer bonding; Pineapple leaf fiber and palm hard fiber are sequentially opened, impurity removed, combed, and dried at 50℃ for 20 minutes to ensure fiber cleanliness and dryness; Attapulgite particles, diatomaceous earth microspheres, and polyglutamic acid resin are subjected to 140-mesh sieving and activation at 90℃ for 12 minutes to improve material uniformity and reactivity; Simultaneously, a 1.2wt% nanocellulose whisker aqueous dispersion is prepared and sealed for later use.

[0056] S2. Treatment of the fast-absorbing and diffusing layer 1: Diffusing microgrooves 7 are pressed on the surface of the hydrophilic nonwoven fabric at 100℃ and 0.10MPa to enhance the ability of liquid to conduct and disperse quickly; Aloe polysaccharide repair coating is uniformly sprayed on the surface of the nonwoven fabric and dried at 55℃ for 8 minutes to make the coating adhere firmly, thus completing the molding and stabilization of the fast-absorbing and diffusing layer 1.

[0057] S3, Gradient diffusion layer 2 preparation: Pineapple leaf modified fiber and attapulgite soil composite water-absorbing particles are thoroughly mixed at a ratio of 6:4 and then uniformly spread into a mesh to form a loose and conductive substrate; 4 g / ㎡ nanocellulose whisker aqueous dispersion is sprayed on the surface of the mesh layer and in-situ crosslinked at 60℃ for 6 min to strengthen it, so that the fiber pores are distributed in a three-dimensional gradient and a stable gradient diffusion structure is obtained.

[0058] S4. Preparation of the integrated double-effect suction and locking layer 3: Konjac glucomannan modified fiber and porous diatomaceous earth water-absorbing microspheres are mixed in a 5:5 ratio and laid as the upper instantaneous absorption structure. Xanthan gum crosslinked modified fiber and plant-based low crosslinked flexible water-locking particles are mixed in a 4.5:5.5 ratio and laid as the lower pre-locking structure. The upper and lower fiber layers are hot-pressed at 65°C for 1 second to form a three-dimensional interweaving and self-locking structure, forming an integrated double-layer suction and locking core without glue.

[0059] S5, the strong water-locking layer 4 is combined with the overall core. The palm hard fiber and polyglutamic acid high-concentration water-locking resin are fully mixed at a ratio of 3.5:6.5 and then evenly spread into a mesh to obtain the strong water-locking layer 4. The strong water-locking layer 4 is precisely aligned and stacked with the dual-effect suction and locking integrated layer 3. After being hot-pressed at a low temperature of 70℃ and 0.08MPa for 1.5s, the multi-dimensional three-dimensional support skeleton 6 is diagonally interwoven through the three functional core layers to ensure the overall structure is stable and does not separate.

[0060] S6, Leak-proof shaping base 5 composite, modified polylactic acid breathable membrane and hydrophobic non-woven fabric are hot melt composite at 90℃ to form a seepage-proof base, nano zinc oxide antibacterial layer is sprayed on the inner side of the base at 0.2MPa to improve long-term antibacterial performance; the composite base is precisely attached to the strong water-locking layer 4, and 0.35g / ㎡ micro-dot glue is applied around the multi-dimensional three-dimensional support skeleton 6 for fixation, and a 0.05mm elastic deformation buffer gap is reserved;

[0061] S7. The overall composite molding process involves bonding the fast-absorbing and guiding layer 1 and the gradient diffusion layer 2 together at 60°C without glue to ensure smooth liquid conduction. An arc-shaped, wrap-around anti-leakage edge is integrally formed at the edge of the core, and the overall edge is hot-melted and sealed at 95°C. Then, precise laser cutting and trimming are performed according to the design dimensions of 240mm×75mm.

[0062] S8. Testing and Packaging: Key indicators such as the thickness, liquid absorption rate, reverse seepage, water-locking strength, and leak-proof performance of the core product are tested item by item; qualified products are screened and sterilized by low-temperature plasma at 30℃ for 12 minutes, and then individually vacuum-packed to complete the finished product preparation.

[0063] Example 4: Medical and Nursing Care

[0064] This embodiment is primarily designed for medical-grade hygiene scenarios such as postpartum lochia care, adult mild incontinence, disposable medical pads, postoperative bed rest care, and daily patient care. It is designed to meet the high requirements of these scenarios for sterility, antibacterial properties, high absorbency, strong water retention, infection prevention, and skin-friendly safety. The core is manufactured using a medical-grade clean process, featuring long-lasting antibacterial nano-zinc oxide and skin-friendly repairing aloe vera polysaccharides. It boasts high absorbency, strong water retention, reliable leak prevention, no chemical adhesive residue, no irritation, and no risk of allergies. It is compatible with maternity pads, adult incontinence pads, medical pads, and postoperative bed rest care products, meeting the hygiene, safety, and absorption needs of both medical institutions and home care.

[0065] S1. Raw material pretreatment: Hydrophilic and hydrophobic nonwoven fabrics are subjected to 400W plasma surface modification for 8 minutes to enhance fiber surface activity and interlayer bonding; Pineapple leaf fiber and palm hard fiber are sequentially opened, impurity removed, combed, and dried at 70℃ for 40 minutes to ensure fiber cleanliness and dryness; Attapulgite particles, diatomaceous earth microspheres, and polyglutamic acid resin are subjected to pharmaceutical-grade 120-mesh sieving and activated at 110℃ for 30 minutes to improve material uniformity and reactivity; Simultaneously, a 2.0wt% sterile nanocellulose whisker aqueous dispersion is prepared and sealed for later use.

[0066] S2. Treatment of the fast-absorbing and diffusing layer 1: Diffusing microgrooves 7 are pressed on the surface of the hydrophilic nonwoven fabric at 110℃ and 0.15MPa to enhance the ability of liquid to conduct and disperse quickly; Aloe polysaccharide repair coating is uniformly sprayed on the surface of the nonwoven fabric and dried at 70℃ for 20 minutes to make the coating adhere firmly, thus completing the molding and stabilization of the fast-absorbing and diffusing layer 1.

[0067] S3, Gradient diffusion layer 2 preparation: Pineapple leaf modified fiber and attapulgite composite water-absorbing particles are thoroughly mixed at a ratio of 6:4 and then uniformly spread into a mesh to form a loose and conductive substrate; 8 g / ㎡ nanocellulose whisker aqueous dispersion is sprayed on the surface of the mesh layer and in-situ crosslinked at 80℃ for 15 min to strengthen it, so that the fiber pores are distributed in a three-dimensional gradient and a stable gradient diffusion structure is obtained.

[0068] S4. Preparation of the dual-effect suction and locking integrated layer 3: Konjac glucomannan modified fiber and porous diatomaceous earth water-absorbing microspheres are mixed in a 5:5 ratio and laid as the upper instantaneous absorption structure. Xanthan gum crosslinked modified fiber and plant-based low crosslinked flexible water-locking particles are mixed in a 4.5:5.5 ratio and laid as the lower pre-locking structure. The upper and lower fiber layers are hot-pressed at 80°C for 3 seconds to form a three-dimensional interlocking and self-locking structure, forming an integrated dual-layer suction and locking core without glue.

[0069] S5, the strong water-locking layer 4 is combined with the overall core. The palm hard fiber and polyglutamic acid high-concentration water-locking resin are fully mixed at a ratio of 3.5:6.5 and then evenly spread into a mesh to obtain the strong water-locking layer 4. The strong water-locking layer 4 is precisely aligned and stacked with the dual-effect suction and locking integrated layer 3. After being hot-pressed at 90℃ and 0.15MPa for 4s, the multi-dimensional three-dimensional support skeleton 6 is diagonally interwoven through the three functional core layers to ensure the overall structure is stable and does not separate.

[0070] S6, Leak-proof shaping base 5 composite, modified polylactic acid breathable membrane and hydrophobic non-woven fabric are hot melt composite at 110℃ to form a seepage-proof base, nano zinc oxide antibacterial layer is sprayed on the inner side of the base at 0.4MPa to improve long-term antibacterial performance; the composite base is precisely attached to the strong water-locking layer 4, and 0.5g / ㎡ micro-dot glue is applied around the multi-dimensional three-dimensional support skeleton 6 for fixation, and a 0.10mm elastic deformation buffer gap is reserved;

[0071] S7. The overall composite molding process involves bonding the fast-absorption and flow guiding layer 1 and the gradient diffusion layer 2 together at 80°C without glue to ensure smooth liquid conduction. An arc-shaped, wrap-around anti-leakage edge is integrally formed at the edge of the core, and the overall edge is hot-melted and sealed at 115°C. Then, precise laser cutting and trimming are performed according to the design dimensions of 300mm×90mm.

[0072] S8. Testing and Packaging: Key indicators such as the thickness, liquid absorption rate, reverse seepage, water-locking strength, and leak-proof performance of the core product are tested item by item; qualified products are screened and sterilized by low-temperature plasma at 42℃ for 25 minutes, and then individually vacuum-packed to complete the finished product preparation.

[0073] Table 1: Comparison of Absorption Rate and Absorption Amount Indicators

[0074] Testing items Example 1 Example 2 Example 3 Example 4 Traditional composite core Single absorption time (s) 1.6 1.4 1.5 1.3 3.2 2-hour continuous absorption (mL) 11 18 15 22 8 Liquid absorption rate (times) 810 860 840 880 620 Liquid diffusion uniformity (%) 92 96 95 97 78 Saturation absorption time (s) 8.2 7.5 7.8 7.1 15.6

[0075] Table 2: Comparison of Water-locking and Anti-reverse seepage performance indicators

[0076] Testing items Example 1 Example 2 Example 3 Example 4 Traditional composite core Atmospheric pressure reverse osmosis rate (g) 0.82 0.65 0.7 0.58 2.15 Pressure reverse osmosis rate (g) 0.91 0.73 0.68 0.61 2.68 Water retention rate (%) 95 98 97 99 86 Gel stability (grade) 4 5 5 5 2 Re-osmosis blocking efficiency (%) 91 96 94 97 65

[0077] Table 3: Comparison of Leakage Prevention and Structural Stability Indicators

[0078] Testing items Example 1 Example 2 Example 3 Example 4 Traditional composite core Side leakage interception rate (%) 92 98 96 97 75 Collapse after liquid absorption (mm) ≤0.08 ≤0.06 ≤0.05 ≤0.05 ≤0.25 Interlayer bond strength (N / 15mm) 4.5 5.2 5 5.5 2.1 Dynamic leak-proof capability (%) 90 95 97 96 70 Overall integrity (level) 4 5 5 5 2

[0079] Table 4: Comparison of Comfort and Safety / Hygiene Indicators

[0080] Testing items Example 1 Example 2 Example 3 Example 4 Traditional composite core Overall thickness (mm) 0.95 1.25 1.1 1.3 1.8 Air permeability (mm / s) 2600 2400 2500 2300 1200 Antibacterial rate (%) 99.2 99.5 99.4 99.8 72.5 Skin irritation (level) 0 0 0 0 1 Surface dryness score (out of 10) 9 9.4 9.3 9.6 6.2

[0081] It should be noted that traditional composite cores mainly use ordinary hydrophilic non-woven fabric as the surface layer, dust-free paper or fluffy non-woven fabric as the diffusion layer, wood pulp fiber mixed with conventional superabsorbent resin as the main absorbent, and conventional PE breathable membrane as the leak-proof bottom layer. The layers are bonded together by a large amount of hot melt adhesive. They are made through conventional processes such as raw material opening, carding and web laying, simple multi-layer stacking, adhesive spraying and shaping, and die-cutting.

[0082] Based on test data of four key indicators—absorption rate and absorption capacity, water retention and anti-backflow performance, leak prevention and structural stability, and comfort and safety—a comparative analysis was conducted on Embodiments 1 to 4 of this invention and a traditional composite core. Embodiment 1 is a lightweight daytime type, suitable for daily commutes and light menstrual care; Embodiment 2 is a nighttime extended-lasting type, meeting the needs for restful sleep and heavy menstrual flow; Embodiment 3 is a sports-fitting type, suitable for dynamic scenarios such as yoga and jogging; Embodiment 4 is a medical care type, used for postpartum, incontinence, and medical bed rest care. All four embodiments employ a five-layer composite structure consisting of a rapid absorption and diversion layer 1, a gradient diffusion layer 2, a dual-effect absorption and locking integrated layer 3, a strong water-locking layer 4, and a leak-proof shaping base 5. Combined with special structures and glue-free processes such as diversion microgrooves 7, three-dimensional gradient pores, three-dimensional fiber entanglement self-locking, a multi-dimensional three-dimensional support skeleton 6, and an arc-shaped wrap-around anti-side leakage baffle, their performance is comprehensively superior to that of traditional cores. They solve common problems of traditional cores, such as slow absorption, uneven diffusion, large backflow, easy collapse and leakage, poor air permeability, and insufficient safety, from both structural and technological perspectives.

[0083] Furthermore, regarding absorption speed and absorption capacity, the four embodiments of this invention rely on a multi-layer synergistic flow-guiding diffusion structure to achieve rapid and efficient absorption. The single absorption times of embodiments one to four are 1.6s, 1.4s, 1.5s, and 1.3s, respectively, which are far lower than the 3.2s of the traditional core, representing an absorption speed increase of over 50%. This is attributed to the flow-guiding microgrooves 7 of the rapid absorption flow-guiding layer 1, which can quickly guide liquid infiltration and avoid surface stagnation. The gradient diffusion layer 2 forms a three-dimensional gradient pore structure through in-situ cross-linking of nanocellulose whiskers, achieving uniform diffusion of the liquid throughout the entire surface area. The liquid diffusion uniformity of the four embodiments is 92%-97%, far exceeding the 78% of the traditional core. The continuous absorption capacity and liquid absorption ratio over 2 hours also show significant advantages. The absorption capacities of embodiments one to four are 11mL, 18mL, 15mL, and 22mL, respectively, and 810 times, 860 times, 840 times, and 880 times, respectively, all significantly higher than the 8mL and 620 times of the traditional core, which can meet the absorption needs of different scenarios. Compared to the shortcomings of traditional cores that lack a flow-guiding and diffusion structure and are prone to liquid accumulation, this invention achieves rapid liquid capture, uniform diffusion, and efficient absorption through multi-layered synergy.

[0084] Furthermore, in terms of water retention and anti-backflow performance, this invention relies on the special structure of the dual-effect suction-lock integrated layer 3 and the strong water-locking layer 4 to achieve strong water retention and low backflow. In Examples 1 to 4, the backflow amount under normal pressure is 0.58-0.82g, and under pressure, it is 0.61-0.91g, far lower than the traditional core's 2.15g and 2.68g, respectively, reducing backflow by more than 60%. The core lies in the dual-effect suction-lock integrated layer 3, which has an asymmetrical structure, forming a progressively tightening suction-locking gradient through three-dimensional fiber interweaving and self-locking, and adhesive-free bonding, achieving unidirectional liquid conduction without backflow; the strong water-locking layer 4 forms a stable interpenetrating network gel structure after absorbing liquid, firmly locking the liquid and preventing collapse. The four examples show a water retention rate of 95%-99%, a backflow blocking efficiency of 91%-97%, and a gel stability of 4-5, all far superior to traditional cores. Traditional core water-locking structures are loose and lack unidirectional conduction design, making them prone to backflow and stickiness. This invention significantly improves dryness through layered absorption and locking, structural self-locking, and gel reinforcement.

[0085] Furthermore, in terms of leak prevention and structural stability, this invention achieves pressure resistance, leak prevention, and stable, non-displacement through a multi-dimensional three-dimensional support frame 6 and an arc-shaped, wraparound anti-leakage baffle. Examples one to four show a side leakage interception rate of 92%-98% and a dynamic leak prevention capability of 90%-97%, both significantly superior to traditional cores. The arc-shaped baffle can wrap around and intercept liquid and guide backflow, structurally eliminating side leakage. The multi-dimensional three-dimensional support frame 6 obliquely penetrates the three-layer functional core, combined with deformation buffer gaps, effectively preventing collapse, delamination, and misalignment after liquid absorption. The collapse degree after liquid absorption in the four examples is ≤0.08mm, far superior to the traditional core's ≤0.25mm; the interlayer bonding strength is 4.5-5.5N / 15mm, and the overall integrity is level 4-5, far exceeding the traditional core's level 2. Among them, Example two has the best side leakage interception, suitable for nighttime leak prevention; Example three has the best dynamic leak prevention, meeting the needs of movement; Example four has the highest structural strength, suitable for medical operations. This invention completely solves the problems of traditional cores being prone to collapse, delamination, displacement, and side leakage, and significantly improves structural stability.

[0086] Furthermore, in terms of comfort and hygiene, this invention leverages the advantages of materials and coatings to achieve a lightweight, breathable, skin-friendly, and antibacterial effect. The four embodiments have an overall thickness of 0.95-1.3mm, making them lightweight and comfortable against the skin. The leak-proof shaping base 5 uses a high-permeability, water-repellent membrane combined with non-woven fabric, along with a glue-free process, achieving a breathability of 2300-2600mm / s, approximately twice that of traditional cores, ensuring a comfortable and cool fit. The fast-absorbing and diverting layer 1, with its aloe vera polysaccharide coating and the base's nano-zinc oxide antibacterial layer, achieves an antibacterial rate of 99.2%-99.8%, with skin irritation at level 0 and a surface dryness score of 9.0-9.6, significantly higher than the traditional core's 6.2. Embodiment 1's lightweight breathability, Embodiment 3's flexible fit, and Embodiment 4's medical-grade antibacterial properties all surpass the shortcomings of traditional cores, such as excessive glue, poor breathability, and easy skin irritation, resulting in a comprehensive improvement in comfort, safety, and hygiene.

[0087] In summary, the four embodiments of this invention are based on a five-layer composite structure, a special microstructure, and a glue-free process, and are specifically optimized for four major scenarios. All key indicators are superior to traditional composite cores. The fast-absorbing and diverting layer 1 provides rapid diversion, the gradient diffusion layer 2 provides uniform diffusion, the dual-effect absorption and locking layer provides unidirectional conduction and pre-locking of water, the strong water-locking layer 4 provides high liquid retention, and the leak-proof shaping base 5 is water-repellent and antibacterial. Combined with three-dimensional support and curved edges, this invention breaks through traditional bottlenecks in structure and process, effectively solving defects such as slow absorption, large backflow, collapse and leakage, poor breathability, and insufficient safety. It possesses advantages such as fast absorption, strong water retention, good leak prevention, stable structure, excellent breathability, and skin-friendly antibacterial properties. It has wider scenario adaptability, more reliable use, and a drier and more comfortable experience, demonstrating significant technological progress and practical value.

[0088] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-absorption, water-locking composite core, characterized in that, From top to bottom, it consists of a five-layer composite structure including a fast-absorbing and guiding layer (1), a gradient diffusion layer (2), a dual-effect suction and locking integrated layer (3), a strong water-locking layer (4), and a leak-proof shaping base (5); A multi-dimensional three-dimensional support skeleton (6) is evenly arranged between the gradient diffusion layer (2), the dual-effect suction and locking integrated layer (3), and the strong water-locking layer (4). The multi-dimensional three-dimensional support skeleton (6) runs through the three functional cores in an obliquely intersecting manner. The top end is engaged and fixed with the bottom surface of the fast-absorption and diversion layer (1), and the bottom end is flexibly connected with the anti-leakage shaping base (5) and a deformation buffer space is reserved. An interpenetrating network gel water-locking structure is formed inside the strong water-locking layer (4). The edge of the anti-leakage shaping base (5) and the edge of each layer of the composite core are integrally formed by hot-melt sealing.

2. The high-absorption, water-locking composite core according to claim 1, characterized in that, The rapid absorption and diversion layer (1) is a 0.12–0.18 mm hydrophilic nonwoven fabric with a basis weight of 16–22 g / m² and a water contact angle of ≤25°. The surface is formed with diversion microgrooves (7) with a groove depth of 0.09–0.12 mm, a width of 0.11–0.14 mm, a density of 16–22 grooves / cm, and the groove depth increases from the center to the edge. The top surface is covered with a 3–6 nm aloe polysaccharide repair coating with a molecular particle size of ≤50 nm, which is uniformly loaded on the surface of the nonwoven fabric fibers.

3. The high-absorption, water-locking composite core according to claim 1, characterized in that, The gradient diffusion layer (2) has a thickness of 0.15–0.25 mm, and the fiber pores are distributed in a three-dimensional gradient. There is no adhesive layer between the layers, which can quickly diffuse and conduct liquid in three dimensions, eliminating local liquid accumulation and surface retention.

4. The high-absorption, water-locking composite core according to claim 1, characterized in that, The dual-effect suction and locking integrated layer (3) is an asymmetrical double-layer composite structure with an upper layer being an instant liquid-capturing layer and a lower layer being a pre-water-locking transition layer, with an overall thickness of 0.30–0.40 mm. The upper layer of fibers is filled with through-hole hollow micropores, and microspheres are embedded in the fiber gaps to achieve millisecond-level liquid capture and directional infiltration. The lower layer forms a semi-interpenetrating network slow-locking structure, which can quickly receive liquid and initially lock in water, preventing liquid from seeping upwards.

5. The high-absorption, water-locking composite core according to claim 1, characterized in that, The upper and lower layers of the dual-effect suction and locking integrated layer (3) are not glued together. They form an integrated structure by three-dimensional fiber interlacing and self-locking. The porosity of the upper layer is greater than that of the lower layer, forming a suction and locking gradient that tightens from top to bottom, so that the liquid can conduct in one direction, seep down quickly, and not flow back.

6. The high-absorption, water-locking composite core according to claim 1, characterized in that, The strong water-locking layer (4) has a thickness of 0.30–0.45 mm. After absorbing liquid, it forms a stable interpenetrating network gel structure that does not backflow, leak, or collapse under pressure.

7. The high-absorption, water-locking composite core according to claim 1, characterized in that, The leak-proof shaping substrate (5) is a 0.08–0.12 mm composite membrane with a 5–12 nm nano zinc oxide antibacterial layer on the inner side. The antibacterial particles have a particle size ≤20 nm and are evenly distributed on the inner side of the membrane. The water repellency level is ≥5 and the sealing shaping edge width is 1.6–2.2 mm.

8. The high-absorption, water-locking composite core according to claim 1, characterized in that, The multi-dimensional three-dimensional support skeleton (6) has a diameter of 0.12–0.22 mm and 110–130 skeletons are distributed per 10 cm². A deformation buffer gap of 0.06–0.12 mm is reserved between the support skeleton and the leak-proof shaping base (5). The support skeleton is positioned by micro-aqueous adhesive with an adhesive amount of ≤0.6 g / m², which can prevent the core from collapsing, delaminating, or misaligning after absorbing liquid.

9. A high-absorption, water-locking composite core according to claim 1, characterized in that, The gradient diffusion layer (2) has an integrally formed arc-shaped anti-leakage baffle with a height of 0.35–0.45 mm and a width of 0.55–0.65 mm, which is seamlessly connected with the gradient diffusion layer (2); it forms an arc-shaped guide slope with a low center and high edge with the fast absorption guide layer (1), which can form an encircling interception of the edge liquid and guide it back to the core.

10. A method for preparing a high-absorption, water-locking composite core as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Raw material pretreatment: Plasma surface modification is performed on hydrophilic and hydrophobic nonwoven fabrics to enhance fiber surface activity and interlayer bonding; pineapple leaf fiber and palm hard fiber are sequentially opened, impurity removed, combed, and dried to ensure clean and dry fibers; attapulgite particles, diatomaceous earth microspheres, and polyglutamic acid resin are graded, sieved, and activated to improve material uniformity and reactivity; a nano-cellulose whisker aqueous dispersion is prepared simultaneously and sealed for later use. S2, Quick Absorption and Flow Guiding Layer (1) Treatment: Flow guiding micro-grooves (7) are pressed on the surface of the hydrophilic nonwoven fabric to enhance the ability of rapid liquid conduction and dispersion; Aloe polysaccharide repair coating is uniformly sprayed on the surface of the nonwoven fabric and dried at low temperature to make the coating firmly adhered, thus completing the molding and stabilization of the quick absorption and flow guiding layer (1). S3, Gradient diffusion layer (2) preparation: pineapple leaf modified fiber and attapulgite soil composite water-absorbing particles are fully mixed and uniformly laid into a mesh to form a loose and conductive substrate; nanocellulose whisker water dispersion is sprayed on the surface of the mesh layer for in-situ cross-linking reinforcement, so that the fiber pores are distributed in a three-dimensional gradient and a stable gradient diffusion structure is obtained. S4, Preparation of the dual-effect suction and locking integrated layer (3): Konjac glucomannan modified fiber and porous diatomaceous earth water-absorbing microspheres are mixed and laid as the upper instantaneous absorption structure, and xanthan gum crosslinked modified fiber and plant-based low crosslinked flexible water-locking particles are mixed and laid as the lower pre-locking structure. The upper and lower layers of fibers are interwoven and self-locked in three dimensions, forming an integrated double-layer suction lock core without adhesive bonding; S5. The strong water-locking layer (4) is combined with the overall core. The palm hard fiber and polyglutamic acid high-concentration water-locking resin are fully mixed and evenly spread to form a strong water-locking layer (4). The strong water-locking layer (4) and the dual-effect suction and locking integrated layer (3) are precisely aligned and stacked. The multi-dimensional three-dimensional support skeleton (6) is diagonally interwoven through the three-layer functional core through low temperature hot pressing to ensure that the overall structure is stable and does not separate. S6, Leak-proof shaping base (5) composite, the modified polylactic acid breathable membrane and hydrophobic non-woven fabric are hot melt composite to form a seepage-proof base, and a nano zinc oxide antibacterial layer is evenly sprayed on the inner side of the base to improve the long-term antibacterial performance; the composite base is precisely attached to the strong water-locking layer (4), and a small amount of glue is applied around the multi-dimensional three-dimensional support skeleton (6) for fixation, and an elastic deformation buffer gap is reserved. S7. The overall composite shaping is carried out by bonding the fast absorption guide layer (1) and the gradient diffusion layer (2) without glue to ensure smooth liquid conduction; an arc-shaped anti-leakage baffle is integrally formed on the edge of the core, and the overall edge is hot-melted and sealed in an integrated manner, and then precisely laser-cut and trimmed according to the design dimensions. S8. Testing and Packaging: Key indicators such as the thickness, liquid absorption rate, reverse seepage, water-locking strength, and leak-proof performance of the core product are tested item by item; qualified products are screened and sterilized by low-temperature plasma, and then individually vacuum-packed to complete the finished product preparation.

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