Multi-component active oxygen bacteriostatic sanitary towel and preparation method thereof

Abstract

This invention discloses a multi-component active oxygen antibacterial sanitary napkin and its preparation method, comprising a permeation-guiding layer, an active oxygen antibacterial layer, an absorbent core layer, and a leak-proof bottom layer. The permeation-guiding layer has a longitudinal main channel and transverse branch channels. The longitudinal main channel extends along the length of the sanitary napkin, and the transverse branch channels intersect the longitudinal main channel at an angle of °. The preparation method of the multi-component active oxygen antibacterial sanitary napkin includes S1, raw material pretreatment, S2, permeation-guiding layer preparation, S3, active oxygen antibacterial layer, S4, absorbent core layer preparation, S5, leak-proof bottom layer preparation, S6, gradient hot-pressing composite process, S7, cutting, and S8, low-temperature ultraviolet sterilization and packaging. By setting an absorbent core layer, this application saves space while increasing the filling amount of the absorbent core layer. Due to the increased amount of absorbent core, the absorbency of the absorbent core layer can be increased, thereby improving the absorbency performance of this application.

Description

Technical Field

[0001] This invention relates to the field of sanitary napkin processing technology, and in particular to a multi-component active oxygen antibacterial sanitary napkin and its preparation method. Background Technology

[0002] Sanitary napkins are disposable hygiene products used to absorb menstrual blood, prevent leakage, and also provide some protection.

[0003] Current technologies have limited water-locking capabilities. Most products use a single wood pulp core, which only provides basic menstrual blood absorption and lacks efficient water-locking structures and components. After absorbing menstrual blood, saturation and leakage easily occur, especially during periods of heavy flow, when menstrual blood can seep back from the core to the surface, causing side and back leakage. Therefore, this application proposes a multi-component active oxygen antibacterial sanitary napkin 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 multi-component active oxygen antibacterial sanitary napkin and its preparation method.

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

[0006] A multi-component active oxygen antibacterial sanitary napkin and its preparation method are disclosed, comprising a permeation-conducting layer, an active oxygen antibacterial layer, an absorbent core layer, and a leak-proof bottom layer. The permeation-conducting layer has a longitudinal main channel and a transverse branch channel. The longitudinal main channel extends along the length of the sanitary napkin, and the transverse branch channel intersects the longitudinal main channel at an angle of °. The cross-section of the longitudinal main channel and the transverse branch channel is rectangular, and a hydrophilic agent is sprayed onto the surface of the permeation-conducting layer.

[0007] Preferably, the active oxygen antibacterial layer is located between the permeation layer and the absorbent core layer, and the active oxygen antibacterial layer is composed of an active oxygen slow-release system, natural antibacterial components, a breathable and absorbent carrier substrate, and a stabilizing layer.

[0008] Preferably, the cross-section of the absorbent core layer is wavy, and the edge of the absorbent core layer is provided with an anti-collapse edging, which is used to keep the absorbent core layer with a wavy outer contour.

[0009] Preferably, the leak-proof bottom layer has a densely distributed number of vertical micropores, and the leak-proof bottom layer has longitudinal micropores for ventilation on both sides. The vertical micropores are connected to the longitudinal micropores, and the leak-proof bottom layer has an edge adhesive wing fixedly connected to its side. The edge adhesive wing is arc-shaped.

[0010] A method for preparing a multi-component active oxygen antibacterial sanitary napkin includes the following steps:

[0011] S1. Raw material pretreatment:

[0012] The surface layer, antibacterial layer, absorbent core layer, leak-proof bottom layer, and auxiliary materials are pretreated separately. The surface material is a blended nonwoven fabric of combed cotton and silk fiber in a ratio of 7:3. It is pretreated with plasma treatment technology with a plasma power of 800W, a treatment time of 30s, and a treatment temperature of 25℃. After treatment, the contact angle is ≤30°. Then, it is cut, and the cut size is 5mm larger than the finished product. Damaged and rough-edged products are removed after cutting.

[0013] The antibacterial layer raw materials include highly breathable and highly absorbent dust-free paper and an active oxygen antibacterial slow-release system. The active oxygen antibacterial slow-release system consists of 15% sodium percarbonate, 10% carbon peroxide, 20% diatomaceous earth, 5% ozone oil, 5% honeysuckle extract, 5% artemisia extract, and 45% deionized water. The natural plant extracts are pulverized to 100 mesh and sieved to remove impurities. They are then stirred with other components at 300 r / min for 20 min to prepare the antibacterial coating liquid. The coating amount is 22g / 100g dust-free paper. The dust-free paper is pre-treated for dust removal.

[0014] The absorbent core is made of wood pulp and super absorbent resin in a 9:1 ratio. The wood pulp is crushed to 50 mesh and sieved before being mixed with SAP for 15 minutes. The mixing uniformity is ≥98%. This produces a high water-locking absorbent core with a thickness of 0.8 to 1.0 mm and a weight of 150 g / m². After mixing, the core is fluffed up. The leak-proof bottom layer is made of PE breathable leak-proof bottom film. After being treated with waterproof and oil-proof properties, the film is cut to the corresponding specifications and the edges are sanded. The auxiliary material is a special hot melt adhesive. The hot melt adhesive is preheated to its melting point and stirred evenly before use.

[0015] S2. Preparation of the permeation layer:

[0016] The pretreated blended nonwoven fabric is laid flat on a molding machine, and a mesh-like flow guiding structure is prepared by hot pressing molding process. The molding temperature is 78±2℃, the pressure is 0.25MPa, and the time is 2s. The flow guiding structure includes longitudinal main channels and transverse branches. The longitudinal main channels are spaced 8 to 10mm apart and 1.5mm wide. The transverse branches intersect the longitudinal main channels at 45° and are 1.0mm wide. The channel depth is 0.10 to 0.12mm. After molding, a nonionic surfactant is applied for hydrophilic treatment with a coating amount of 5g / ㎡ to ensure that the contact angle is ≤25°.

[0017] S3. Preparation of active oxygen antibacterial layer: The pretreated high-permeability and high-absorbency dust-free paper is laid flat on the coating equipment. The conveyor belt speed is adjusted to 10m / min. The antibacterial coating liquid is evenly coated on the surface of the dust-free paper using a scraper coating method. The coating thickness is 0.05mm. After coating, the paper is sent to the drying equipment and dried at 40℃ for 15min. The moisture content of the antibacterial layer after drying is ensured to be ≤5%. The paper is then taken out and allowed to cool naturally to room temperature. The antibacterial rate is tested to be ≥99% before it is put into use.

[0018] S4. Preparation of absorbent core layer: The pretreated wood pulp and SAP mixture are laid and formed by air-flow web forming process. The forming temperature is 60℃, the pressure is 0.2MPa, and the forming thickness is controlled between 0.8 and 1.0mm. After forming, it is hot-pressed at 80℃ for 5s and 0.25MPa. The water absorption ratio is ≥550 times and the water retention rate is ≥90% before it is ready for use.

[0019] S5. Preparation of leak-proof bottom layer: The pretreated PE breathable leak-proof bottom film is laid flat on the conveyor belt. The conveyor belt speed is adjusted to 15m / min. Special hot melt adhesive is applied to the inner side of the bottom film in contact with the absorbent core by spraying. The coating amount is 1g / ㎡. After coating, it is naturally cooled for 3min.

[0020] S6. Gradient hot-pressing composite process: Lay each layer in the order of permeable layer, active oxygen antibacterial layer, absorbent core layer, and leak-proof bottom layer. Adjust the conveyor belt speed to 20m / min to ensure that each layer is aligned, without offset or wrinkles, and the edge deviation of each layer does not exceed 0.5mm.

[0021] S7. Cutting: Cut precisely to three specifications: daytime use 240mm×80mm, nighttime use 320mm×100mm, and extended nighttime use 420mm×120mm. The cutting error is ≤±1mm. Avoid the flow channel and key parts of the antibacterial layer when cutting. After cutting, remove excess scraps and sort out unqualified products.

[0022] S8. Low-temperature ultraviolet sterilization and packaging: Qualified products are sent into a low-temperature sterilization chamber and sterilized for 15 minutes using ultraviolet light with a wavelength of 254nm and a power of 300W. The sterilization environment temperature is 20 to 25℃ and the humidity is 45 to 55%. The products are evenly distributed without stacking. After sterilization, samples are taken for testing to ensure that the total number of colonies on the product surface is ≤10cfu / g and the sterilization rate is ≥99.9%. The products are then removed and allowed to cool naturally to room temperature.

[0023] Each product is individually packaged in food-grade PE. Every 10 pieces are packed into a moisture-proof non-woven fabric outer packaging bag, which is equipped with a sealing zipper. After packaging, the finished products undergo full inspection. Qualified products are put into storage at a temperature of 15 to 25°C and a humidity of ≤60%, with a stacking height not exceeding 1.5m.

[0024] Preferably, in step S1, the thickness of the surface blended nonwoven fabric is 0.18 to 0.22 mm, the weight is 30 to 32 g / m², the purity of the combed cotton is 95%, the length of the silk fiber is 3 to 5 mm, the thickness of the high-breathability and high-absorbency dust-free paper is 0.15 mm, the weight is 25 g / m², the thickness of the PE breathable and leak-proof bottom film is 0.03 mm, the density is 0.92 g / cm³, the surface is opened with micropores, the micropore diameter is 0.01 to 0.02 mm, the pore spacing is 1 mm, and after waterproof and oil-proof treatment, the waterproof pressure is ≥18 kPa and the air permeability is ≥500 ml / (cm²·min).

[0025] Preferably, the special hot melt adhesive in step S1 has a melting point of 90℃, a viscosity of 2000mPa·s, and an adhesion strength ≥5N / 25mm.

[0026] Preferably, in step S7, the product edges after cutting are neat, without burrs, without skewing, and without incomplete cutting. In step S8, the packaging process strictly controls the cleanliness of the environment to avoid secondary contamination of the product. During the full inspection of the finished product, unqualified products with damaged or missing packaging are rejected. The SAP is sodium polyacrylate with a particle size of 100 to 200 mesh and a water absorption ratio of ≥550 times. The antibacterial coating liquid coating process is free of missed coating and accumulation.

[0027] Preferably, the gradient hot-pressing composite process involves three layers of hot pressing: 1. Permeation-conducting layer and active oxygen antibacterial layer: hot pressing temperature 85±2℃, pressure 0.3MPa, time 2s;

[0028] 2. Active oxygen antibacterial layer and absorbent core layer: hot pressing temperature 90±2℃, pressure 0.35MPa, time 3s;

[0029] 3. Absorbent core layer and leak-proof bottom layer: hot pressing temperature 80±2℃, pressure 0.25MPa, time 2s. During the composite process, ensure that each layer is tightly bonded, without gaps or delamination, and the interlayer peel force is ≥4N / 25mm.

[0030] The present invention has the following beneficial effects:

[0031] 1. By setting an absorbent core layer, the filling amount of the absorbent core layer in this application is increased while saving space. Since the amount of absorbent core is increased, the water absorption capacity of the absorbent core layer can be increased, thereby improving the water absorption performance of this application.

[0032] 2. By setting up a permeable layer and a flow-guiding structure with longitudinal main channels and transverse branches, this application can quickly guide menstrual blood to the absorbent core layer, avoid the accumulation of menstrual blood on the surface, and effectively reduce side leakage and backflow.

[0033] 3. By setting up a vertical main channel and horizontal branches, this application can accelerate the air circulation inside the sanitary napkin, timely expel moisture and heat, thereby enhancing overall breathability, improving user comfort, and reducing bacterial growth. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a multi-component active oxygen antibacterial sanitary napkin proposed in this invention;

[0035] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0036] Figure 3This is a schematic diagram of the longitudinal main channel structure of a multi-component active oxygen antibacterial sanitary napkin proposed in this invention;

[0037] Figure 4 This is a schematic diagram of the vertical micropore structure of a multi-component active oxygen antibacterial sanitary napkin proposed in this invention;

[0038] Figure 5 This is a schematic diagram of the absorbent core layer of a multi-component active oxygen antibacterial sanitary napkin proposed in this invention;

[0039] Figure 6 This is a schematic flowchart illustrating the preparation method of a multi-component active oxygen antibacterial sanitary napkin proposed in this invention.

[0040] In the diagram: 1. Permeation layer, 2. Longitudinal main channel, 3. Transverse branch channel, 4. Edge adhesive wing, 5. Active oxygen antibacterial layer, 6. Leak-proof bottom layer, 7. Anti-collapse edge banding, 8. Longitudinal micropores, 9. Vertical micropores, 10. Absorbent core layer. Detailed Implementation

[0041] 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.

[0042] Example 1:

[0043] S1. Raw material preparation:

[0044] The materials used are ordinary polypropylene nonwoven fabric, 0.20mm thick, 30g / m²; ordinary wood pulp absorbent core, 90% purity, 0.8mm thick, 120g / m²; and PE leak-proof bottom film, 0.03mm thick, 0.92g / cm³. Conventional hot melt adhesive is used, with a melting point of 85℃ and a viscosity of 1500mPa·s. All raw materials are standard sanitary napkin materials. Upon arrival, raw materials undergo visual inspection to ensure they are free of damage, impurities, and odors before being put into production.

[0045] S2. Molding and preparation:

[0046] Lay the skin-friendly non-woven fabric on the conveyor belt of the production line and adjust the conveyor belt speed to 15m / min to ensure that the surface is flat, wrinkle-free, and without deviation. Then, evenly lay the ordinary wood pulp absorbent core in the center of the non-woven fabric using a laying device. The thickness of the laying material is controlled at 0.8±0.05mm to ensure that the absorbent core is aligned with the non-woven fabric and that the lateral deviation does not exceed 1mm. Next, cover the absorbent core with a PE leak-proof bottom film. Stack the three layers of materials in sequence: non-woven fabric, wood pulp absorbent core, and PE leak-proof bottom film. After stacking, perform preliminary pressing with a pressure controlled at 0.2MPa to ensure that each layer is secure.

[0047] S3, Hot-pressed composite:

[0048] The constant temperature hot pressing process is adopted. The three-layer material after preliminary pressing is fed into the hot pressing equipment. The hot pressing temperature is controlled at 85±2℃, the hot pressing pressure is 0.35MPa, the composite speed is consistent with the conveyor belt speed, 15m / min, the hot pressing time is 3s, and the width of the hot pressing roller matches the width of the product to ensure that the three-layer material is bonded together. It is required that there is no obvious delamination, bubbles, or wrinkles.

[0049] S4. Precise Cutting:

[0050] Cut according to the standard daytime and nighttime specifications. The daytime specification is 240mm×80mm, and the nighttime specification is 320mm×100mm. During cutting, ensure that the cutting error is controlled within ±2mm, and that the edges are neat, without burrs, skewing, or incomplete cutting. After cutting, the products need to be sorted and defective products are removed.

[0051] S5. Sterilization treatment:

[0052] The cut products are sent into a UV sterilization chamber and sterilized using UV technology. The UV wavelength is 254nm, the power is 200W, and the sterilization time is 20 minutes. The sterilization environment temperature is controlled at 25±2℃ and the humidity is controlled at 50±5%. During the sterilization process, the products are ensured to be evenly distributed and not stacked. After sterilization, samples are taken for testing. The total number of colonies on the product surface is ≤100cfu / g. Only products that pass the test can proceed to the packaging stage.

[0053] S6. Finished Product Packaging:

[0054] After sterilization, the sanitary napkins are individually packaged using ordinary PE packaging film. During packaging, it is ensured that the product is wrinkle-free and without displacement, and that the packaging film is sealed intact without damage or leakage. Ten pads are placed into one outer packaging bag. Secondary contamination is avoided during the packaging process. The storage environment temperature is controlled at 15-25℃ and the humidity is ≤60%.

[0055] Example 2:

[0056] S1. Raw material preparation:

[0057] A 7:3 blend of combed cotton and silk fiber nonwoven fabric is selected, with a thickness of 0.18 to 0.22 mm and a weight of 30 to 32 g / m². The combed cotton has a purity of 95%, and the silk fiber length is 3 to 5 mm. The remaining raw materials are the same as in Example 1. All raw materials must be inspected upon arrival. The blended nonwoven fabric is tested for hydrophilicity and thickness uniformity, and the wood pulp absorbent core is tested for purity and bulkiness. Only qualified materials are put into production.

[0058] S2, Surface flow channel forming:

[0059] The blended nonwoven fabric was laid flat on the worktable of the molding equipment. The molding equipment parameters were adjusted, and a mesh-like flow-guiding structure was prepared using a hot-press molding process. The molding temperature was controlled at 78±2℃, the molding pressure at 0.25MPa, and the molding time at 2s. The flow-guiding structure was designed with longitudinal main channels 2 and transverse branches. The longitudinal main channels 2 were spaced 8 to 10mm apart and 1.5mm wide. The transverse branches intersected the longitudinal main channels 2 at a 45° angle, with a width of 1.0mm and a channel depth of 0.10 to 0.12mm. After molding, the surface nonwoven fabric was hydrophilically treated with a nonionic surfactant coating at a rate of 5g / ㎡. The coating was applied evenly and without omissions, ensuring a surface contact angle ≤30°. The surface was tested at 25℃ and then allowed to air dry for 5 minutes after treatment. The flow-guiding surface layer was then prepared and ready for use.

[0060] S3. Molding and preparation:

[0061] The prepared flow-guiding surface layer, ordinary wood pulp absorbent core, and PE leak-proof bottom film are laid out in sequence, with the same laying requirements as in Example 1. The conveyor belt speed is adjusted to 15m / min to ensure that the three layers are aligned, without offset or wrinkles. The flow-guiding channel of the flow-guiding surface layer faces upward. The thickness of the wood pulp absorbent core is controlled at 0.8±0.05mm. The PE leak-proof bottom film completely covers the absorbent core. After laying, preliminary pressing is performed with a pressure of 0.2MPa to ensure that each layer is tightly bonded without loosening.

[0062] S4, Hot-pressed composite:

[0063] Consistent with Example 1, a constant temperature hot pressing process is used. The three-layer material after preliminary pressing is sent into the hot pressing equipment. The hot pressing temperature is 85±2℃, the pressure is 0.35MPa, the composite speed is 15m / min, and the hot pressing time is 3s. During the hot pressing process, it is necessary to avoid flattening the guide channel to ensure that the three-layer material is tightly bonded without delamination or air bubbles.

[0064] S5, Precise Cutting:

[0065] The daytime size is 240mm×80mm, and the nighttime size is 320mm×100mm. The cutting error is ±2mm. After cutting, the edges are neat, without burrs or skewing. When cutting, avoid the key parts of the flow channel to avoid damaging the flow structure. After cutting, unqualified products are sorted out, and qualified products are sent to the sterilization process.

[0066] S6. Sterilization treatment:

[0067] Consistent with Example 1, the cut products are sent into an ultraviolet sterilization chamber with an ultraviolet wavelength of 254nm, a power of 200W, a sterilization time of 20min, a sterilization environment temperature of 25±2℃, and a humidity of 50±5%. During this process, the products must be evenly distributed without stacking. After sterilization, samples are taken for testing, and the total number of colonies must be ≤100cfu / g. After passing the test, the products proceed to the packaging stage.

[0068] S7. Finished Product Packaging:

[0069] Each piece is individually packaged in PE. During packaging, ensure that the surface of the product is free of wrinkles and damage, and that the packaging film is properly sealed. Pack 10 pieces into one outer packaging bag to avoid secondary contamination. After packaging, store in a cool, dry place at a temperature of 15-25℃ and a humidity of ≤60% to complete the preparation of the finished product.

[0070] Example 3:

[0071] S1. Raw material preparation:

[0072] The surface layer uses a 7:3 blend of combed cotton and silk fiber nonwoven fabric, with parameters consistent with Example 2. A new antibacterial layer is added, using highly breathable and absorbent dust-free paper with a thickness of 0.15mm, a basis weight of 25g / ㎡, and an air permeability ≥800ml / (cm²·min). The active oxygen antibacterial slow-release system consists of 15% sodium percarbonate, 10% carbon peroxide, 20% diatomaceous earth, 5% ozone oil, and 50% deionized water, with a coating amount of 22g / 100g dust-free paper.

[0073] The remaining raw materials are: ordinary wood pulp absorbent core, PE leak-proof bottom film, and conventional hot melt adhesive, which are the same as in Example 1. Before use, the hydrophilicity of the blended nonwoven fabric must be tested, the air permeability of the dust-free paper must be tested, and the antibacterial effect of the antibacterial system must be tested. After passing the tests, the fabrics should be stored separately. The antibacterial system should be used within 24 hours after preparation.

[0074] S2, Surface flow channel forming:

[0075] Completely consistent with Example 2, the blended nonwoven fabric was hot-pressed at 78±2℃ and 0.25MPa to form a mesh-like flow-guiding structure. The longitudinal main channels 2 were spaced 8 to 10 mm apart, and the transverse branches intersected at 45°. The channel depth was 0.10 to 0.12 mm. Subsequently, it was hydrophilic treated and coated with a nonionic surfactant at a coating amount of 5 g / ㎡ to ensure that the contact angle was ≤30°. The test was conducted at 25℃, and the treated material was naturally air-dried for 5 minutes to complete the preparation of the flow-guiding surface layer for later use.

[0076] S3, coated with active oxygen antibacterial ingredients:

[0077] Highly breathable and highly absorbent cleanroom paper is laid flat on the conveyor belt of the coating equipment. The conveyor belt speed is adjusted to 10 m / min. Using a doctor blade coating method, the prepared active oxygen antibacterial slow-release system is evenly coated onto the surface of the cleanroom paper. The coating thickness is controlled at 0.05 ± 0.01 mm, ensuring uniform coating without any missed areas or accumulation. After coating, the paper is sent to a drying equipment at a drying temperature of 40 ± 2℃ for 15 minutes. After drying, the moisture content of the antibacterial layer is tested to be ≤ 5%, and the antibacterial rate is ≥ 99%. Once qualified, the paper is removed and allowed to cool naturally to room temperature, completing the preparation of the antibacterial layer for later use.

[0078] S4. Molding and preparation:

[0079] The flow-guiding surface layer, antibacterial layer, ordinary wood pulp absorbent core, and PE leak-proof bottom membrane are laid out in sequence. The laying order is flow-guiding surface layer, antibacterial layer, wood pulp absorbent core, and PE leak-proof bottom membrane. The conveyor belt speed is 15m / min. Ensure that each layer is aligned, without offset or wrinkles. The antibacterial layer completely covers the absorbent core and is tightly bonded to the flow-guiding surface layer. The wood pulp absorbent core is laid with a thickness of 0.8±0.05mm. The PE leak-proof bottom membrane completely covers the absorbent core. After laying, it is initially pressed together with a pressure of 0.25MPa to ensure that each layer is not loose.

[0080] S5, Hot-pressed composite:

[0081] Consistent with Examples 1 and 2, a constant temperature hot pressing process was adopted, with a hot pressing temperature of 85±2℃, a pressure of 0.35MPa, a composite speed of 15m / min, and a hot pressing time of 3s. This ensures that the four layers of materials—the flow guiding surface layer, the antibacterial layer, the absorbent core, and the bottom film—are tightly bonded without delamination or bubbles, while also protecting the flow guiding channels and the antibacterial layer to prevent their structure from being damaged.

[0082] S6. Precise Cutting:

[0083] Consistent with Examples 1 and 2, the daytime specification is 240mm×80mm, the nighttime specification is 320mm×100mm, the cutting error is ±2mm, the edges are neat without burrs or skewing, and the key parts of the flow channel and antibacterial layer are avoided during cutting. After cutting, unqualified products are sorted out, and qualified products are sent to the sterilization process.

[0084] S7. Sterilization treatment:

[0085] Consistent with Examples 1 and 2, the cut products were sent to an ultraviolet sterilization chamber with an ultraviolet wavelength of 254nm, a power of 200W, a sterilization time of 20min, a sterilization environment temperature of 25±2℃, and a humidity of 50±5%. The products were evenly distributed without stacking. Due to the presence of an antibacterial layer, after sterilization, sampling and testing were conducted. The total bacterial count was ≤50cfu / g. After passing the test, the products proceeded to the packaging stage.

[0086] S8. Finished Product Packaging:

[0087] Consistent with Examples 1 and 2, each product is individually packaged in PE. During packaging, it is ensured that the diversion surface and antibacterial layer are undamaged and wrinkle-free, and the packaging film is sealed properly to prevent the antibacterial ingredients from becoming ineffective. Ten tablets are packed into one outer packaging bag. Secondary contamination is avoided during the packaging process. After packaging, the product is stored in a cool and dry warehouse at a temperature of 15-25℃ and a humidity of ≤60% to complete the preparation of the finished product.

[0088] Example 4:

[0089] S1. Raw material pretreatment:

[0090] Surface material: 7:3 blended nonwoven fabric of combed cotton and silk fibers, thickness 0.18 to 0.22 mm, weight 30 to 32 g / m², combed cotton purity 95%, silk fiber length 3 to 5 mm. Pre-treatment using plasma treatment technology, plasma power 800W, treatment time 30 seconds, treatment temperature 25℃, to improve surface hydrophilicity and adhesion, resulting in a contact angle ≤30° after treatment. After treatment, the fabric is cut to a size 5 mm larger than the finished product to facilitate subsequent processing. Damaged and frayed products are removed after cutting.

[0091] Antibacterial layer material: Highly breathable and highly absorbent dust-free paper, 0.15mm thick, 25g / m² weight, air permeability ≥800ml / (cm²·min). Active oxygen antibacterial slow-release system: 15% sodium percarbonate, 10% carbamide peroxide, 20% diatomaceous earth, 5% ozone oil, natural plant extracts (honeysuckle extract + artemisia extract 5%), and 45% deionized water.

[0092] Pretreatment: Crush the natural plant extract to 100 mesh, sieve to remove impurities, mix it evenly with other components, stir at 300 r / min for 20 min to prepare a uniform antibacterial coating solution, with a coating amount of 22 g / 100 g dust-free paper; the dust-free paper is pre-treated to remove dust to ensure that the surface is free of impurities.

[0093] Absorbent core raw materials: wood pulp + superabsorbent polymer (SAP) in a 9:1 ratio. The wood pulp has a purity of 95%, and the SAP is sodium polyacrylate with a particle size of 100 to 200 mesh and a water absorption ratio of ≥550 times. Pretreatment: the wood pulp is crushed to 50 mesh, sieved, and then mixed evenly with SAP for 15 minutes. The mixing uniformity is ≥98%, resulting in a high water-locking absorbent core with a thickness of 0.8 to 1.0 mm and a basis weight of 150 g / m². After mixing, a fluffing treatment is performed to ensure a uniform absorbent core structure without clumping.

[0094] Leak-proof bottom layer 12 material: PE breathable leak-proof bottom film, thickness 0.03mm, density 0.92g / cm³, surface with micropores, pore diameter 0.01 to 0.02mm, pore spacing 1mm, pretreatment: waterproof and oil-proof treatment, after treatment waterproof pressure ≥18kPa, air permeability ≥500ml / (cm²·min); after treatment, cut to the corresponding specifications, and the edges are polished smooth to avoid scratching other layers of material.

[0095] Auxiliary materials: Special hot melt adhesive, melting point 90℃, viscosity 2000mPa·s, bonding strength ≥5N / 25mm. The hot melt adhesive should be preheated to its melting point and stirred evenly to avoid clumping.

[0096] S2. Preparation of the permeation layer:

[0097] The pretreated blended nonwoven fabric was laid flat on a molding machine. The molding machine parameters were adjusted, and a mesh-like flow-guiding structure was prepared using a hot-press molding process. The molding temperature was 78±2℃, the molding pressure was 0.25MPa, and the molding time was 2s. The flow-guiding structure consisted of a longitudinal main channel 2 with a spacing of 8 to 10 mm and a width of 1.5 mm plus transverse branches, intersecting the longitudinal main channel 2 at a 45° angle with a width of 1.0 mm and a channel depth of 0.10 to 0.12 mm. After molding, a hydrophilic treatment was performed again, with a nonionic surfactant coating at a dosage of 5 g / m², ensuring a contact angle ≤25°.

[0098] S3. Preparation of the active oxygen antibacterial layer:

[0099] The pretreated high-permeability and high-absorbency cleanroom paper is laid flat on the coating equipment. The conveyor belt speed is adjusted to 10m / min. The prepared active oxygen antibacterial coating solution is evenly coated on the surface of the cleanroom paper using a doctor blade coating method. The coating thickness is 0.05mm, and the coating is uniform with no missed areas or accumulation. After coating, the paper is sent to the drying equipment. The drying temperature is 40℃ and the drying time is 15min. The moisture content is monitored in real time during the drying process to ensure that the moisture content of the antibacterial layer after drying is ≤5%. After removal, the paper is naturally cooled to room temperature. The antibacterial rate is tested and found to be ≥99%. After passing the test, the preparation of the active oxygen antibacterial layer 11 is completed and ready for use.

[0100] S4. Preparation of the absorber core layer:

[0101] The pretreated wood pulp and SAP mixture are uniformly laid and molded using an air-flow web forming process. The molding temperature is 60℃, the molding pressure is 0.2MPa, and the molding thickness is controlled between 0.8 and 1.0mm. After molding, hot pressing is performed at 80℃ for 5 seconds at a pressure of 0.25MPa to ensure that the absorbent core structure is uniform, not prone to clumping, and free from looseness. The absorbent core layer 10 is then prepared. The water absorption ratio is tested to be ≥550 times and the water retention rate is ≥90%. After passing the test, it is ready for use.

[0102] S5. Preparation of the leak-proof bottom layer:

[0103] The pretreated PE breathable and leak-proof bottom film is laid flat on the conveyor belt at a speed of 15m / min. Special hot melt adhesive is applied to the inside of the bottom film and the side in contact with the absorbent core by spraying. The amount of adhesive is 1g / ㎡. The coating is uniform, without accumulation or omissions. After coating, it is allowed to cool naturally for 3 minutes to ensure that the hot melt adhesive is initially solidified and to avoid adhesion during subsequent laying. The preparation of the leak-proof bottom layer 12 is completed and sent to the composite stage.

[0104] S6, Gradient hot-pressing composite process:

[0105] The permeation-conducting layer 1, the active oxygen antibacterial layer 11, the absorbent core layer 10, and the leak-proof bottom layer 12 are laid out sequentially in the order of permeation-conducting layer, antibacterial layer, absorbent core layer 10, and leak-proof bottom layer 12. The conveyor belt speed is 20m / min, ensuring that each layer is aligned, without offset or wrinkles, and that the edge deviation of each layer does not exceed 0.5mm. A gradient hot-pressing composite process is adopted, with three layers hot-pressed: 1. Permeation-conducting layer and antibacterial layer: hot-pressing temperature 85±2℃, pressure 0.3MPa, time 2s.

[0106] 2. Antibacterial layer and absorbent core layer 10: Hot pressing temperature 90±2℃, pressure 0.35MPa, time 3s.

[0107] 3 Absorbent core layer 10 and leak-proof bottom layer 12: hot pressing temperature 80±2℃, pressure 0.25MPa, time 2s.

[0108] During the lamination process, the bonding of each layer is monitored in real time to ensure that each layer is tightly bonded, without gaps or delamination, and the interlayer peel force is ≥4N / 25mm. After lamination, the material is sent to the cutting stage.

[0109] S7. Cutting:

[0110] Precise cutting is performed according to three specifications: daytime use, nighttime use, and extended nighttime use. The daytime use size is 240mm×80mm, the nighttime use size is 320mm×100mm, and the extended nighttime use size is 420mm×120mm. The cutting error is ≤±1mm, and the edges are neat, without burrs, skewing, or incomplete cutting. During cutting, the flow channel and key parts of the antibacterial layer are avoided to prevent damage to the product structure. After cutting, excess scraps are removed, unqualified products are sorted, and qualified products are sent to the sterilization process.

[0111] S8. Low-temperature ultraviolet sterilization and packaging:

[0112] Sterilization: Low-temperature ultraviolet sterilization process is adopted. Qualified products are sent into a low-temperature sterilization chamber with an ultraviolet wavelength of 254nm, a power of 300W, and a sterilization time of 15min. The sterilization environment temperature is controlled at 20 to 25℃ and the humidity is 45 to 55%. The products are evenly distributed without stacking to ensure that each product is fully sterilized. After sterilization, sampling and testing are carried out. The total number of colonies on the product surface is ≤10cfu / g, and the sterilization rate is ≥99.9%. After passing the test, the products are taken out and allowed to cool naturally to room temperature.

[0113] Packaging: Each product is individually packaged in food-grade PE, with 10 pieces packed into an outer packaging bag made of moisture-proof non-woven fabric. The outer packaging bag is equipped with a sealing zipper for easy storage and retrieval. During the packaging process, the cleanliness of the environment is strictly controlled to avoid secondary contamination. After packaging, a full inspection of the finished products is carried out to remove products with damaged packaging or missing seals. Qualified products are put into storage at a temperature of 15 to 25°C and a humidity of ≤60%. The stacking height should not exceed 1.5m to avoid compression and deformation, thus completing the finished product preparation.

[0114] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Antibacterial rate (%) 0 0 99.2 99.6 99.7 99.4 Total bacterial count (cfu / g) 95 90 42 8 15 12 Sterilization rate (%) 88 90 94 99.8 99.7 99.6 Water absorption ratio (times) 165 175 185 565 555 570 Water retention rate (%) 48 50 52 92 83 85 Bottom layer breathability (ml / (cm²・min)) 180 220 320 520 430 450

[0115] To improve the antibacterial effect, the proportion of ozone oil added to the active oxygen antibacterial coating solution in Comparative Example 1 was slightly increased, resulting in an antibacterial rate of 99.7%, slightly higher than 99.6% in Example 4. However, this adjustment brought about multiple performance losses. Excessive ozone oil would affect the swelling performance of sodium polyacrylate SAP in the absorbent core, causing the water absorption ratio to drop to 555 times, which is lower than 565 times in Example 4. The water retention rate also dropped significantly to 83%, far lower than 92% in Example 4.

[0116] To accommodate the adjustment of the antibacterial components, the power of ultraviolet sterilization was slightly reduced, resulting in a lower sterilization rate. Consequently, the total bacterial count increased to 15 cfu / g, and the cleanliness performance was weaker than in Example 4. The microporous processing parameters of the breathable bottom film were also fine-tuned, reducing the bottom layer's air permeability to 430 ml / (cm²・min), a significant decrease in breathability. Overall, Comparative Example 1 achieved an improved antibacterial rate, but this led to a decline in water absorption, water retention, cleanliness, and breathability, resulting in overall performance far inferior to Example 4.

[0117] Comparative Example 2 slightly improved water absorption capacity by optimizing the particle size ratio of wood pulp and SAP in the absorbent core, achieving a water absorption ratio of 570 times, which is better than the 565 times of Example 4. However, this adjustment compromised cost and process adaptation. To reduce raw material costs, the amount of honeysuckle and artemisia extracts added to the active oxygen antibacterial layer 11 was reduced, resulting in a decrease in the antibacterial rate to 99.4% and the sterilization rate to 99.6%. The antibacterial and sterilization effects were weaker than those of Example 4, and the total bacterial count also increased to 12 cfu / g, leading to a decrease in cleanliness.

[0118] Optimizing the absorbency ratio without simultaneously adjusting the SAP crosslinking process resulted in no improvement in the absorbent core's water-locking performance, with a water-locking rate of only 85%, which is significantly lower than the 92% in Example 4, making it prone to menstrual blood backflow.

[0119] The waterproof and breathable treatment time of the PE breathable bottom membrane was shortened, but the bottom layer breathability decreased to 450ml / (cm²・min), which is not as good as that of Example 4. Overall, Comparative Example 2 only achieved a slight optimization of the water absorption ratio, but caused varying degrees of decline in the five core indicators of antibacterial, sterilization, cleanliness, water retention, and breathability, and its overall performance was inferior to that of Example 4.

[0120] Example 1 uses conventional raw materials and a simple preparation process. The raw materials are ordinary polypropylene nonwoven fabric surface layer, a single ordinary wood pulp absorbent core, and a conventional PE leak-proof bottom film. No antibacterial layer is set. The process only uses a simple constant temperature hot pressing composite process to complete the bonding of each layer, combined with ultraviolet sterilization with conventional parameters. There is no surface flow guiding structure design, and no pretreatment of any raw materials is performed.

[0121] Limited by the basic raw material selection and simple process, the core performance of Example 1 is the worst. It has no active antibacterial ability, the antibacterial rate is 0, the product cleanliness is extremely low, the total number of colonies is 95cfu / g, and the sterilization rate is only 88%. The water absorption and water retention capacity is weak, with an absorption ratio of only 165 times and a water retention rate of 48%, which easily leads to menstrual blood leakage and backflow problems. The bottom layer breathability is only 180ml / (cm²・min), and the poor breathability makes it easy to feel stuffy when using it. However, overall it can meet the basic usage requirements of sanitary napkins to absorb menstrual blood.

[0122] Building upon Example 1, Example 2 upgrades the surface material to a 7:3 blend of combed cotton and silk fibers in a non-woven fabric. This improves the surface's skin-friendliness while optimizing its basic fluid-wicking ability. Furthermore, a hot-press molding process adds a longitudinal main channel 2 and a 45° transverse branching mesh-like flow-guiding structure to the surface. This enables rapid guidance and dispersion of menstrual blood, preventing its accumulation on the surface.

[0123] This improvement increased the efficiency of menstrual blood penetration, indirectly reducing conditions for bacterial growth, resulting in a decrease in the total bacterial count to 90 cfu / g and an increase in the sterilization rate to 90%, thus slightly improving the product's cleanliness. The combination of the blended surface layer and the diversion structure also increased the absorbency to 175 times and the water retention rate to 50%, while the bottom layer's breathability increased to 220 ml / (cm²・min), slightly improving both absorbency and breathability. However, Example 2 did not add an antibacterial layer, so the antibacterial rate remained 0, with no active antibacterial effect. Furthermore, the absorbent core still used a single ordinary wood pulp material, and the water absorption and retention capacity remained the core weakness. The overall performance improvement was limited to the liquid diversion-related dimensions and did not address the pain points in actual use.

[0124] Based on Example 2, Example 3 adds an antibacterial function, while keeping the rest of the process and raw material selection consistent with Example 2. Highly breathable and highly absorbent cleanroom paper is introduced as the substrate for the antibacterial layer, combined with an active oxygen antibacterial coating liquid, and the antibacterial layer is prepared through a doctor blade coating and low-temperature drying process. Due to the addition of the antibacterial layer, the antibacterial rate reaches 99.2%.

[0125] The high breathability and absorbency of the antibacterial layer, combined with the original flow-guiding structure, creates a more challenging environment for bacterial growth inside the product, significantly improving its cleanliness. This results in a total bacterial count reduced to 42 cfu / g and a sterilization rate of 94%. Simultaneously, the addition of the antibacterial layer did not negatively impact the product's liquid-guiding or breathability functions. The absorbency increased to 185 times its original volume, the water retention rate increased to 52%, and the bottom layer's breathability increased to 320 ml / (cm²・min). Absorbency and breathability improved slightly with structural changes. However, the absorbent core in Example 3 still uses a single ordinary wood pulp material, and its water absorption and retention capacity remains relatively low.

[0126] Example 4 retains the flow-guiding structure and antibacterial layer design of Example 3, and optimizes the raw materials, preparation process, and product structure of each structural layer. The surface layer undergoes plasma pretreatment to improve its liquid-guiding performance, and natural extracts of honeysuckle and artemisia are added to the antibacterial layer. The absorbent core uses a composite system of wood pulp and sodium polyacrylate-type SAP in a 9:1 ratio, and the leak-proof bottom layer 12 is treated with a waterproof and oil-proof process to optimize performance.

[0127] In terms of process, Example 4 adopts a gradient hot-pressing composite process to improve the adhesion and structural stability between layers and optimize the ultraviolet sterilization process parameters to improve the sterilization effect.

[0128] Therefore, the performance of Example 4 was comprehensively improved, with increases in antibacterial rate, total bacterial count, and sterilization rate. The absorbent core, a composite of wood pulp and SAP, enabled the product to achieve a water absorption ratio of 565 times and a water retention rate of 92%, significantly enhancing its water absorption and retention capabilities and solving leakage and backflow problems. After process upgrades, the air permeability of the leak-proof bottom layer 12 also reached a relatively ideal value of 520 ml / (cm²・min).

[0129] 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 multi-component active oxygen antibacterial sanitary napkin, comprising a permeability-conducting layer (1), an active oxygen antibacterial layer (5), an absorbent core layer (10), and a leak-proof bottom layer (6), characterized in that, The permeable layer (1) has a longitudinal main channel (2) and a transverse branch channel (3). The longitudinal main channel (2) extends along the length of the sanitary napkin. The transverse branch channel (3) intersects the longitudinal main channel (2) at a 45° angle. The cross-section of the longitudinal main channel (2) and the transverse branch channel (3) is rectangular. The surface of the permeable layer (1) is sprayed with a hydrophilic agent.

2. The multi-component active oxygen antibacterial sanitary napkin according to claim 1, characterized in that, The active oxygen antibacterial layer (5) is located between the permeable layer (1) and the absorbent core layer (10). The active oxygen antibacterial layer (5) is composed of an active oxygen slow-release system, natural antibacterial components, a breathable and absorbent carrier substrate and a stabilizing layer.

3. The multi-component active oxygen antibacterial sanitary napkin according to claim 1, characterized in that, The cross-section of the absorbent core layer (10) is wavy, and the edge of the absorbent core layer (10) is provided with an anti-collapse edging (7). The anti-collapse edging (7) is used to keep the absorbent core layer (10) with a wavy outer contour.

4. The multi-component active oxygen antibacterial sanitary napkin according to claim 1, characterized in that, The leak-proof bottom layer (6) has a dense distribution of multiple vertical micropores (9), and the leak-proof bottom layer (6) has longitudinal micropores (8) for ventilation on both sides. The vertical micropores (9) are connected to the longitudinal micropores (8). The leak-proof bottom layer (6) has an edge adhesive wing (4) fixedly connected to its side. The edge adhesive wing (4) is arc-shaped.

5. A method for preparing a multi-component active oxygen antibacterial sanitary napkin according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Raw material pretreatment: The surface layer, antibacterial layer, absorbent core layer (10), leak-proof bottom layer (6) and auxiliary materials are pretreated respectively. The surface material is a blended nonwoven fabric of combed cotton and silk fiber in a ratio of 7:

3. It is pretreated with plasma treatment technology with a plasma power of 800W, a treatment time of 30s, and a treatment temperature of 25℃. After treatment, the contact angle is ≤30°. Then it is cut, and the cut size is 5mm larger than the finished product. After cutting, damaged and rough products are removed. The antibacterial layer raw materials include highly breathable and highly absorbent dust-free paper and an active oxygen antibacterial slow-release system. The active oxygen antibacterial slow-release system consists of 15% sodium percarbonate, 10% carbon peroxide, 20% diatomaceous earth, 5% ozone oil, 5% honeysuckle extract, 5% artemisia extract, and 45% deionized water. The natural plant extracts are pulverized to 100 mesh and sieved to remove impurities. They are then stirred with other components at 300 r / min for 20 min to prepare the antibacterial coating liquid. The coating amount is 22g / 100g dust-free paper. The dust-free paper is pre-treated for dust removal. The absorbent core material is a mixture of wood pulp and super absorbent resin in a 9:1 ratio. The wood pulp is crushed to 50 mesh and then mixed with SAP for 15 minutes. The mixing uniformity is ≥98%. A high water-locking absorbent core with a thickness of 0.8 to 1.0 mm and a weight of 150 g / ㎡ is made. After mixing, it is fluffed. The leak-proof bottom layer (6) material is a PE breathable leak-proof bottom film. After waterproof and oil-proof treatment, it is cut to the corresponding specifications and the edges are polished. The auxiliary material is a special hot melt adhesive. The hot melt adhesive is heated to the melting point in advance and stirred evenly for later use. S2. Preparation of the permeation layer: The pretreated blended nonwoven fabric was laid flat on a molding machine, and a mesh flow guiding structure was prepared by hot pressing molding process. The molding temperature was 78±2℃, the pressure was 0.25MPa, and the time was 2s. The flow guiding structure included a longitudinal main channel (2) and a transverse branch. The longitudinal main channel (2) had a spacing of 8 to 10 mm and a width of 1.5 mm. The transverse branch intersected the longitudinal main channel (2) at 45° and had a width of 1.0 mm. The channel depth was 0.10 to 0.12 mm. After molding, a nonionic surfactant was applied for hydrophilic treatment. The coating amount was 5 g / ㎡, and the contact angle was ≤25°. S3. Preparation of active oxygen antibacterial layer: The pretreated high-permeability and high-absorbency dust-free paper is laid flat on the coating equipment. The conveyor belt speed is adjusted to 10m / min. The antibacterial coating liquid is evenly coated on the surface of the dust-free paper using a scraper coating method. The coating thickness is 0.05mm. After coating, the paper is sent to the drying equipment and dried at 40℃ for 15min. The moisture content of the antibacterial layer after drying is ensured to be ≤5%. The paper is then taken out and allowed to cool naturally to room temperature. The antibacterial rate is tested to be ≥99% before it is put into use. S4. Preparation of absorbent core layer: The pretreated wood pulp and SAP mixture are laid and formed by air-flow web forming process. The forming temperature is 60℃, the pressure is 0.2MPa, and the forming thickness is controlled between 0.8 and 1.0mm. After forming, it is hot-pressed at 80℃ for 5s and 0.25MPa. The water absorption ratio is ≥550 times and the water retention rate is ≥90% before it is ready for use. S5. Preparation of leak-proof bottom layer: The pretreated PE breathable leak-proof bottom film is laid flat on the conveyor belt. The conveyor belt speed is adjusted to 15m / min. Special hot melt adhesive is applied to the inner side of the bottom film in contact with the absorbent core by spraying. The coating amount is 1g / ㎡. After coating, it is naturally cooled for 3min. S6. Gradient hot pressing composite process: Lay each layer in the order of permeable layer (1), active oxygen antibacterial layer (5), absorbent core layer (10), and leak-proof bottom layer (6), adjust the conveyor belt speed to 20m / min, and ensure that each layer is aligned, without offset or wrinkles, and the edge deviation of each layer does not exceed 0.5mm. S7. Cutting: Cut precisely to three specifications: daytime use 240mm×80mm, nighttime use 320mm×100mm, and extended nighttime use 420mm×120mm. The cutting error is ≤±1mm. Avoid the flow channel and key parts of the antibacterial layer when cutting. After cutting, remove excess scraps and sort out unqualified products. S8. Low-temperature ultraviolet sterilization and packaging: Qualified products are sent into a low-temperature sterilization chamber and sterilized for 15 minutes using ultraviolet light with a wavelength of 254nm and a power of 300W. The sterilization environment temperature is 20 to 25℃ and the humidity is 45 to 55%. The products are evenly distributed without stacking. After sterilization, samples are taken for testing to ensure that the total number of colonies on the product surface is ≤10cfu / g and the sterilization rate is ≥99.9%. The products are then removed and allowed to cool naturally to room temperature. Each product is individually packaged in food-grade PE. Every 10 pieces are packed into a moisture-proof non-woven fabric outer packaging bag, which is equipped with a sealing zipper. After packaging, the finished products undergo full inspection. Qualified products are put into storage at a temperature of 15 to 25°C and a humidity of ≤60%, with a stacking height not exceeding 1.5m.

6. The method for preparing a multi-component active oxygen antibacterial sanitary napkin according to claim 5, characterized in that, In step S1, the thickness of the surface blended nonwoven fabric is 0.18 to 0.22 mm, the weight is 30 to 32 g / m², the purity of the combed cotton is 95%, the length of the silk fiber is 3 to 5 mm, the thickness of the high-breathability and high-absorbency dust-free paper is 0.15 mm, the weight is 25 g / m², and the thickness of the PE breathable and leak-proof bottom film is 0.03 mm, the density is 0.92 g / cm³, the surface is opened with micropores, the micropore diameter is 0.01 to 0.02 mm, the pore spacing is 1 mm, and after waterproof and oil-proof treatment, the waterproof pressure is ≥18 kPa and the air permeability is ≥500 ml / (cm²·min).

7. The method for preparing a multi-component active oxygen antibacterial sanitary napkin according to claim 5, characterized in that, The special hot melt adhesive used in step S1 has a melting point of 90℃, a viscosity of 2000mPa·s, and an adhesion strength ≥5N / 25mm.

8. The method for preparing a multi-component active oxygen antibacterial sanitary napkin according to claim 5, characterized in that, In step S7, the product edges are neat, burr-free, skew-free, and incompletely cut after cutting. In step S8, the packaging process strictly controls the cleanliness of the environment to avoid secondary contamination of the product. During the full inspection of the finished product, unqualified products with damaged or missing packaging are rejected. The SAP used is sodium polyacrylate with a particle size of 100 to 200 mesh and a water absorption ratio of ≥550 times. The antibacterial coating liquid coating process is free of missed coating and accumulation.

9. The method for preparing a multi-component active oxygen antibacterial sanitary napkin according to claim 5, characterized in that, The gradient hot-pressing composite process consists of three layers:

1. Infiltration layer and active oxygen antibacterial layer: hot-pressing temperature 85±2℃, pressure 0.3MPa, time 2s; 2. Active oxygen antibacterial layer and absorbent core layer: hot pressing temperature 90±2℃, pressure 0.35MPa, time 3s; 3. Absorbent core layer and leak-proof bottom layer: hot pressing temperature 80±2℃, pressure 0.25MPa, time 2s. During the composite process, ensure that each layer is tightly bonded, without gaps or delamination, and the interlayer peel force is ≥4N / 25mm.

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