Bacteriostatic sanitary towel with knitted cloth cover layer and preparation method of bacteriostatic sanitary towel

Abstract

The invention discloses an antibacterial sanitary towel with a knitted cloth cover layer, which comprises a sanitary towel body, the sanitary towel body sequentially comprises a bottom film layer, an absorption layer and a hydrophilic surface layer from bottom to top according to the orientation during use, hot melt adhesive layers I are arranged among the bottom film layer, the absorption layer and the hydrophilic surface layer, and the sanitary towel further comprises a side vertical protection edge covering layer, one side of the side face vertical protection edge covering layer can be bonded to the sanitary towel body, the other side of the side face vertical protection edge covering layer extends towards the side away from the sanitary towel body, and the preparation method of the antibacterial sanitary towel with the knitted cloth cover layer comprises the following steps of preparation of the hydrophilic face layer, preparation of the absorption layer, preparation of the bottom film layer, preparation of the side face vertical protection edge covering layer, overall assembly and quality detection. The knitted composite hot air non-woven fabric formed by mixing the bamboo fibers and the polyester fibers is adopted, is subjected to various treatment processes, is soft in hand feeling, makes contact with skin comfortably, has natural antibacterial performance and can reduce irritation to the skin.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary napkins, and particularly to a bacteriostatic sanitary napkin with a knitted fabric surface layer and a preparation method thereof. Background Art

[0002] In the daily life of women, sanitary napkins are essential supplies during the menstrual period. With the development of social economy and the remarkable improvement of living standards, women pay more and more attention to their own health and quality of life, and the requirements for sanitary napkins have become increasingly diverse.

[0003] The surface layer material of traditional sanitary napkins is relatively rough. Some common surface layer materials, such as ordinary non-woven fabrics, are not soft enough in texture and are prone to friction during long-term contact with the skin, resulting in skin discomfort and even possible allergic reactions. Especially for women with relatively sensitive skin, this discomfort is more obvious, greatly affecting the quality of life during menstruation. Moreover, traditional surface layer materials often have poor air permeability. During menstruation, women's bodies are in a relatively sensitive state. The stuffy and humid environment not only increases discomfort but also creates favorable conditions for bacterial growth.

[0004] Accordingly, this application proposes a bacteriostatic sanitary napkin with a knitted fabric surface layer and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a bacteriostatic sanitary napkin with a knitted fabric surface layer and a preparation method thereof.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A bacteriostatic sanitary napkin with a knitted fabric surface layer includes a sanitary napkin body. The sanitary napkin body sequentially includes a bottom film layer, an absorption layer, and a hydrophilic surface layer from bottom to top according to the orientation during use. There is a first hot melt adhesive layer between the bottom film layer, the absorption layer, and the hydrophilic surface layer;

[0008] It also includes a side standing guard and edging layer. One side of the side standing guard and edging layer can be bonded to the sanitary napkin body, and the other side extends away from the sanitary napkin body.

[0009] Preferably, the peripheral side of the hydrophilic surface layer extends outward with a knitted fabric extension part, and the peripheral side of the bottom film layer extends outward with a composite material waterproof layer. A clamping layer for bonding and fixing the side standing guard and edging layer is formed between the composite material waterproof layer and the knitted fabric extension part. A second hot melt adhesive layer is coated on the inner wall of the clamping layer, and a release paper is provided on the second hot melt adhesive layer.

[0010] Preferably, the side standing guard and edging layer includes a protective outer layer, a buffer intermediate layer, and a skin-friendly contact layer.

[0011] Preferably, the extension length of the knitted fabric of the hydrophilic surface layer is the same as that of the composite waterproof layer of the bottom film layer.

[0012] Preferably, the polylactic acid diversion filaments of the absorbent layer are distributed in a regular array, and the diamond-shaped channels are evenly arranged in the middle area of the absorbent layer.

[0013] Preferably, the protective outer layer of the side standing edge wrapping layer is made of water-repellent non-woven fabric, the buffer intermediate layer is made of foamed cotton, and the skin-friendly contact layer is made of soft non-woven fabric.

[0014] A preparation method of a bacteriostatic sanitary napkin with a knitted fabric surface layer according to any one of claims 1-6, comprising the following steps:

[0015] Preparation of the hydrophilic surface layer: First, pretreat bamboo fiber and polyester fiber respectively, and then mix them in proportion; optimize the knitting process using intelligent knitting equipment; pretreat the knitted fabric and hot air non-woven fabric and then compound them, and then perform softening and antibacterial finishing. Cut the finished hydrophilic surface layer into a shape with a knitted fabric extension part;

[0016] Preparation of the absorbent layer: Pretreat fluff pulp and superabsorbent resin, prepare chitosan solution and concentrated green tea extract solution; air-lay the treated fluff pulp, superabsorbent resin and polylactic acid diversion filaments, hot-roll and reinforce them and compound three layers of materials, perform chitosan coating treatment on the bottom layer, and perform green tea extract spraying treatment on the absorbent layer; detect the absorption performance, antibacterial performance and physical performance of the absorbent layer;

[0017] Preparation of the bottom film layer: Mix polylactic acid and starch-based composite materials with antistatic agent and slip agent, prepare by casting method, optimize process parameters to control the thickness deviation, perform on-line stretching and micro-embossing treatment, and cut the prepared bottom film layer into a shape with a composite waterproof layer;

[0018] Preparation of the side standing edge wrapping layer: Bond the protective outer layer, buffer intermediate layer and skin-friendly contact layer together by hot pressing process, then perform pre-stretching treatment on the polypropylene non-woven fabric, and cut it into a side standing edge wrapping layer with a specified width and shape;

[0019] Overall assembly: Coat a first hot melt adhesive layer between the bottom film layer, absorbent layer and hydrophilic surface layer for compounding, coat a second hot melt adhesive layer on the inner wall of the clamping layer, and stick a release paper. According to needs, bond the side standing edge wrapping layer in the clamping layer by tearing off the release paper;

[0020] Quality inspection: Perform quality inspections on the finished products such as appearance, size, absorption performance, antibacterial performance, and anti-side leakage performance, and pack and store the qualified products.

[0021] The present invention has the following beneficial effects:

[0022] 1. The hydrophilic surface layer is made of a knitted composite hot air non-woven fabric mixed with bamboo fiber and polyester fiber. Through a variety of treatment processes, it has a soft touch, is comfortable to contact with the skin, and has natural antibacterial properties, which can reduce the irritation to the skin. At the same time, the bamboo fiber, silver ion antibacterial agent in the hydrophilic surface layer, the chitosan coating and green tea extract in the absorption layer, etc. all have antibacterial effects, which can effectively inhibit the growth of bacteria and ensure the menstrual hygiene of women.

[0023] 2. The absorption layer adopts a special layered structure and material treatment method, combined with polylactic acid diversion filaments and diamond channels, which can quickly absorb and diffuse liquids, improve the absorption efficiency and absorption capacity, and effectively prevent leakage.

[0024] 3. The design of the side standing guard edge layer can effectively prevent side leakage, and the combination of the protective outer layer, the buffer intermediate layer and the skin-friendly contact layer not only ensures the side leakage prevention function, but also improves the comfort of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic diagram of the overall structure of a bacteriostatic sanitary napkin with a knitted fabric surface layer proposed by the present invention;

[0026] Figure 2 FIG. is a schematic diagram showing the parts of a bacteriostatic sanitary napkin with a knitted fabric surface layer proposed by the present invention.

[0027] In the figure: 1. Sanitary napkin body; 2. Bottom film layer; 3. Absorption layer; 4. Hydrophilic surface layer; 5. Side standing guard edge layer. DETAILED DESCRIPTION OF THE INVENTION

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] A bacteriostatic sanitary napkin with a knitted fabric surface layer includes a sanitary napkin body 1. The sanitary napkin body 1 sequentially includes a bottom film layer 2, an absorption layer 3, and a hydrophilic surface layer 4 from bottom to top in the orientation during use;

[0030] The hydrophilic surface layer 4 is made of a knitted composite hot air non-woven fabric of natural color of bamboo fiber by mixing bamboo fiber and polyester fiber in a specific ratio (such as 70% bamboo fiber and 30% polyester fiber). Bamboo fiber has the characteristics of natural antibacterial, strong air permeability and moisture absorption. During the pretreatment process, it undergoes impurity removal, enzyme treatment (soaking in a cellulose enzyme solution with a concentration of 0.5%-1% for 30-40 minutes at 40-45°C and a pH value of 4.5-5.5 to improve the fiber structure, softness and water absorption), and softening treatment, making its hand feel softer and more comfortable. The polyester fiber is treated with antistatic treatment and low-temperature plasma treatment, enhancing its compatibility with bamboo fiber and the stability of the overall fabric. During the knitting process, the parameters are precisely controlled by intelligent knitting equipment, and unique breathable textures (such as diamond or honeycomb shapes) are woven in to further improve the air permeability performance.

[0031] The absorbent layer 3 contains treated high-quality domestic softwood fluff pulp and potassium acrylate-acrylamide copolymer superabsorbent resin (SAP). The fluff pulp is first soaked in a sodium carbonate solution with a concentration of 0.3%-0.8% for 8-12 minutes to remove impurities and part of the lignin, then rinsed and pre-dried at 80-90°C for 15-20 minutes to improve its fluffiness and hydrophilicity. The SAP is surface-treated with 0.5%-1% silane coupling agent and dried at 60-70°C for 2-3 hours to enhance its binding force with the fluff pulp and its own stability.

[0032] The bottom film layer 2 is made of a composite material of polylactic acid and starch in a ratio of 7:3, adding 0.5%-1% antistatic agent and 0.3%-0.5% lubricant. It has a multi-layer structure. The waterproof layer is a polylactic acid layer with a thickness of 0.05-0.08 mm, providing reliable waterproof performance; the buffer layer is a foamed polypropylene layer with a thickness of 0.1-0.15 mm, increasing softness and buffering effect, reducing friction with clothes; the isolation layer is a polyethylene film layer with a thickness of 0.03-0.05 mm added with nano-silica, improving the wear resistance and puncture resistance of the bottom film.

[0033] A first hot melt adhesive layer is provided between the bottom film layer 2, the absorbent layer 3 and the hydrophilic surface layer 4; the peripheral side of the hydrophilic surface layer 4 extends outward with a knitted fabric extension part, and the peripheral side of the bottom film layer 2 extends outward with a composite material waterproof layer. A clamping layer for bonding and fixing the side vertical guard edge layer 5 is formed between the composite material waterproof layer and the knitted fabric extension part. A second hot melt adhesive layer is coated on the inner wall of the clamping layer, and a release paper is provided on the second hot melt adhesive layer. The extended lengths of the knitted fabric extension part of the hydrophilic surface layer 4 and the composite material waterproof layer of the bottom film layer 2 are the same. The polylactic acid diversion filaments of the absorbent layer 3 are distributed in a regular array, and the diamond channels are evenly arranged in the middle area of the absorbent layer 3, making the diffusion speed of the liquid in the absorbent layer 3 several times higher than that of the ordinary absorbent layer 3, and can quickly absorb a large amount of menstrual blood.

[0034] It also includes a side vertical protection edge layer 5. The outer layer of the side vertical protection edge layer 5 is made of water-repellent non-woven fabric and has good waterproof performance, which can effectively block the leaked liquid. The thickness of the foamed cotton material of the buffer intermediate layer is (0.3 - 0.5 mm), providing a soft buffering effect and reducing the friction and pressure on the body. The soft non-woven fabric material of the skin-friendly contact layer is comfortable to contact with the skin, and the pH value of its material is close to the skin pH value, reducing the irritation to the skin. The width of the side vertical protection edge layer 5 is (2 - 3 cm), which can effectively prevent side leakage and does not affect the activities of the user.

[0035] One side of the side vertical protection edge layer 5 can be adhered to the sanitary napkin body 1, and the other side extends away from the sanitary napkin body 1. The side vertical protection edge layer 5 includes a protective outer layer, a buffer intermediate layer, and a skin-friendly contact layer. The protective outer layer of the side vertical protection edge layer 5 is made of water-repellent non-woven fabric, the buffer intermediate layer is made of foamed cotton material, and the skin-friendly contact layer is made of soft non-woven fabric.

[0036] A preparation method of a bacteriostatic sanitary napkin with a knitted fabric surface layer includes the following steps:

[0037] Preparation of the hydrophilic surface layer 4: First, pretreat bamboo fiber and polyester fiber respectively, and then mix them in proportion; optimize the knitting process using intelligent knitting equipment; pretreat the knitted fabric and hot air non-woven fabric and then compound them, and then carry out softening and antibacterial finishing. Cut the treated hydrophilic surface layer 4 into a shape with a knitted fabric extension part;

[0038] Preparation of the absorbent layer 3: Pretreat fluff pulp and superabsorbent resin, prepare chitosan solution and green tea extract concentrate; air-lay and hot-roll and reinforce the treated fluff pulp, superabsorbent resin and polylactic acid diversion filaments and compound the three-layer material, carry out chitosan coating treatment on the bottom layer, and carry out green tea extract spraying treatment on the absorbent layer 3; detect the absorption performance, antibacterial performance and physical performance of the absorbent layer 3;

[0039] Preparation of the bottom film layer 2: Mix polylactic acid and starch-based composite material with antistatic agent and slip agent, prepare by casting method, optimize the process parameters to control the thickness deviation, carry out online stretching and micro-embossing treatment, and cut the prepared bottom film layer 2 into a shape with a composite material waterproof layer;

[0040] Preparation of the side vertical protection edge layer 5: Composite the protective outer layer, the buffer intermediate layer and the skin-friendly contact layer together by hot pressing process, and then carry out pre-stretching treatment on the polypropylene non-woven fabric, and cut it into a side vertical protection edge layer 5 with a specified width and shape;

[0041] Overall assembly: A first hot melt adhesive layer is coated between the bottom film layer 2, the absorbent layer 3 and the hydrophilic surface layer 4 for lamination. A second hot melt adhesive layer is coated on the inner wall of the clamping layer, and a release paper is attached. As needed, the side vertical protection edge layer 5 is bonded inside the clamping layer by tearing off the release paper.

[0042] Quality inspection: Quality inspections such as appearance, dimensions, absorption performance, antibacterial performance, and leak-proof performance are carried out on the finished products. Qualified products are packaged and stored in the warehouse.

[0043] Example 1:

[0044] Step 1: Preparation of the hydrophilic surface layer. High-quality bamboo fibers from Fujian are used. Impurities are removed using an ultrasonic cleaning device. The bamboo fibers are placed in a cellulose enzyme solution with a concentration of 0.9%, and processed for 38 minutes at 43°C and a pH value of 5.2 to effectively improve the performance of the bamboo fibers. After softening treatment, rinsing with water and drying;

[0045] The polyester fibers are subjected to antistatic treatment, and then low-temperature plasma treatment is carried out for 4.5 minutes under the conditions of a vacuum degree of 14 Pa and a power of 95 W;

[0046] The bamboo fibers and polyester fibers are mixed in a ratio of 70% and 30%, and knitted using an intelligent knitting device. The knitting density in the central area is set to 26 stitches per inch, and the yarn tension is 2.4 cN / dtex; the knitting density in the edge area is 24 stitches per inch, and the yarn tension is 2.9 cN / dtex. At the same time, honeycomb-shaped breathable textures are woven in. The knitted fabric is pretreated with ultraviolet rays for 7 minutes, and a 0.09 μm nano-titanium dioxide silicone coating is applied to the hot air non-woven fabric. Lamination is carried out for 6 minutes under the conditions of 127°C and 0.45 MPa. Then, it is soaked in a 5% silicone softener at 50°C for 30 minutes, soaked in a 0.3% silver ion antibacterial agent for 20 minutes, and finally dried at 90°C. The sorted hydrophilic surface layer is cut out in a shape with a knitted fabric extension part.

[0047] Step 2: Preparation of the absorbent layer. High-quality domestic softwood fluff pulp produced in Heilongjiang is selected, placed in a sodium carbonate solution with a concentration of 0.7% and soaked for 11 minutes, rinsed and dried at 88°C for 19 minutes;

[0048] The acrylate-acrylamide copolymer superabsorbent resin is surface-treated with 0.9% silane coupling agent and dried at 68°C for 2.8 hours;

[0049] The prepared chitosan solution and green tea extract concentrate, the treated fluff pulp, superabsorbent resin and polylactic acid diversion filaments with a diameter of 0.35 mm and a spacing of 5.5 mm are made into an absorbent layer through an air-laying process, and then hot-rolled and strengthened under the conditions of 118°C and 0.13 MPa. The top layer is 24 g / m 2The hydrophilic spunbond non-woven fabric diversion layer, the middle absorption layer and the bottom layer of 29 g / m 2 The water-repellent non-woven fabric water-locking layer is laminated. The bottom water-repellent non-woven fabric is immersed in the chitosan solution for 3 minutes, and then dried at 58 °C for 11 minutes to coat its surface with a chitosan coating with a thickness of 0.025 mm. The absorption layer is sprayed with the concentrated green tea extract solution (spraying amount: 9 g / m 2 ), and then dried at 63 °C for 13 minutes. Various performance tests are carried out on the absorption layer to ensure that the quality meets the standards.

[0050] Step 3: Preparation of the bottom film layer. Mix the polylactic acid and starch-based composite materials in a ratio of 7:3, and add 0.9% antistatic agent and 0.45% slip agent. The bottom film is prepared by the casting method, and the process parameters are strictly controlled, and the thickness deviation is controlled within ±0.003 mm. Online stretching is carried out, the longitudinal stretching ratio is 1.4, the transverse stretching ratio is 1.5, and then micro-embossing treatment is carried out. Cut out the shape with the composite material waterproof layer from the prepared bottom film layer.

[0051] Step 4: Preparation of the side standing guard and edge wrapping layer. The water-repellent non-woven fabric of the protective outer layer, the foamed cotton of the buffer middle layer and the soft non-woven fabric of the skin-friendly contact layer are laminated together under the conditions of a hot pressing temperature of 140 °C and a pressure of 0.2 MPa. The polypropylene non-woven fabric is pre-stretched by 14%, and then cut into the side standing guard and edge wrapping layer with the specified width and shape.

[0052] Step 5: Overall assembly. Apply a first hot melt adhesive layer between the bottom film layer, the absorption layer and the hydrophilic surface layer for lamination to ensure that each layer is tightly combined. Apply a second hot melt adhesive layer on the inner wall of the clamping layer (formed by the knitted fabric extension of the hydrophilic surface layer and the composite material waterproof layer of the bottom film layer) and stick the release paper on it. The side standing guard and edge wrapping layer is bonded in the clamping layer by tearing off the release paper.

[0053] Step 6: Quality inspection. Conduct a comprehensive quality inspection on the finished product, including appearance inspection to ensure no defects; size measurement to ensure compliance with the standards; absorption performance test to simulate different flow conditions and verify the absorption speed and absorption capacity; antibacterial performance test to test against common bacteria; and side leakage prevention performance evaluation to simulate daily activity scenarios. The qualified products are packaged and stored in the warehouse.

[0054] Example 2:

[0055] Step 1: Preparation of the hydrophilic surface layer. Select high-quality bamboo fibers from Jiangxi. In the impurity removal process, use a vibrating screening device to remove impurities and short fibers. Subsequently, place the bamboo fibers in a cellulose enzyme solution with a concentration of 0.6%, and treat them in an environment of 40 °C and a pH value of 4.8 for 32 minutes, which greatly improves the softness and water absorption of the bamboo fibers. Then, soak them with a softener, and then rinse and dry them with clean water;

[0056] After the polyester fiber is treated with antistatic agent, it is subjected to low-temperature plasma treatment for 4 minutes under the conditions of a vacuum degree of 12 Pa and a power of 90 W to enhance its mixing performance with bamboo fiber. The treated bamboo fiber and polyester fiber are mixed in a ratio of 70% and 30%, and knitted using intelligent knitting equipment. The knitting density of the central area is set to 25 stitches per inch, and the yarn tension is adjusted to 2.3 cN / dtex; the knitting density of the edge area is set to 24 stitches per inch, and the yarn tension is 2.8 cN / dtex. At the same time, diamond-shaped breathable textures are woven in, and the knitted fabric is pretreated with ultraviolet rays for 5 minutes to enhance the surface activity of the knitted fabric; a 0.06 μm nano-titanium dioxide silicone coating is applied to the hot air non-woven fabric to improve its performance. Under the conditions of 123 °C and 0.4 MPa, the knitted fabric and the hot air non-woven fabric are compounded for 5 minutes. Then, it is soaked in 3% silicone softener at 40 °C for 20 minutes, and then soaked in 0.1% silver ion antibacterial agent for 15 minutes, and finally dried at 80 °C. The finished hydrophilic surface layer is cut into a shape with an extension of the knitted fabric.

[0057] Step 2: Preparation of the absorption layer. Select high-quality domestic coniferous wood fluff pulp produced in Shandong, put it into a sodium carbonate solution with a concentration of 0.4% and soak for 9 minutes to fully remove impurities and lignin, then rinse it clean and dry it at 82 °C for 16 minutes;

[0058] For the potassium acrylate-acrylamide copolymer superabsorbent resin, surface treatment is carried out with 0.6% silane coupling agent and dried at 62 °C for 2.2 hours to enhance its binding force with the fluff pulp;

[0059] The prepared chitosan solution and green tea extract concentrate, the treated fluff pulp, superabsorbent resin and polylactic acid diversion filaments with a diameter of 0.25 mm and a spacing of 4.5 mm are made into an absorption layer through an air-laying process, and then hot-rolled and strengthened under the conditions of 112 °C and 0.1 MPa. The hydrophilic spunbond non-woven fabric diversion layer with a weight of 20 g / m 2 of the top layer, the middle absorption layer and the water-repellent non-woven fabric water-locking layer with a weight of 25 g / m 2 of the bottom layer are compounded. The bottom water-repellent non-woven fabric is immersed in the chitosan solution for 2 minutes, and then dried at 52 °C for 9 minutes to coat its surface with a 0.015 mm thick chitosan coating. The absorption layer is sprayed with green tea extract concentrate (spraying amount 6 g / m 2 ), and then dried at 57 °C for 11 minutes. The absorption performance, antibacterial performance and physical performance of the absorption layer are detected to ensure that all performances meet the requirements.

[0060] Step 3: Preparation of the bottom film layer. Mix polylactic acid and starch-based composite materials in a ratio of 7:3, add 0.6% antistatic agent and 0.35% slip agent, stir well, and prepare the bottom film by the casting method. By precisely controlling process parameters such as screw speed, temperature, and casting speed, control the thickness deviation within ±0.002 mm, conduct on-line stretching, with a longitudinal stretching ratio of 1.25 and a transverse stretching ratio of 1.35, and then perform micro-embossing treatment to improve the comprehensive performance of the bottom film. Cut out the prepared bottom film layer into a shape with a composite material waterproof layer.

[0061] Step 4: Preparation of the side vertical protection and edge wrapping layer. Composite the water-repellent non-woven fabric of the protective outer layer, the foamed cotton of the buffer intermediate layer, and the soft non-woven fabric of the skin-friendly contact layer together under the conditions of a hot pressing temperature of 130 °C and a pressure of 0.15 MPa. Perform a 10% pre-stretching treatment on the polypropylene non-woven fabric, and then cut it into a side vertical protection and edge wrapping layer with a specified width and shape.

[0062] Step 5: Overall assembly. Coat a first layer of hot melt adhesive between the bottom film layer, the absorption layer, and the hydrophilic surface layer for composite to ensure that each layer is tightly combined. Coat a second layer of hot melt adhesive on the inner wall of the clamping layer and stick on the release paper. According to actual requirements, bond the side vertical protection and edge wrapping layer in the clamping layer by tearing off the release paper.

[0063] Step 6: Quality inspection. Conduct comprehensive quality inspections on the finished products, including appearance, dimensions, absorption performance, antibacterial performance, side leakage prevention performance, etc. Qualified products are packaged and stored in the warehouse.

[0064] Example 3:

[0065] Step 1: Preparation of the hydrophilic surface layer. Select high-quality bamboo fibers from Sichuan, remove impurities through a multi-stage filtration device, put the bamboo fibers into a cellulose enzyme solution with a concentration of 0.75%, treat them in an environment of 42 °C and a pH value of 5.0 for 35 minutes. After performing antistatic treatment on the polyester fibers, conduct low-temperature plasma treatment for 4.2 minutes under the conditions of a vacuum degree of 13 Pa and a power of 92 W;

[0066] Mix the bamboo fibers and polyester fibers in a ratio of 70% and 30%, knit using an intelligent knitting device, with a knitting density of 25.5 stitches per inch in the central area and a yarn tension of 2.35 cN / dtex; the knitting density in the edge area is 24 stitches per inch and the yarn tension is 2.85 cN / dtex, and weave in a unique circular breathable texture;

[0067] The knitted fabric is pretreated with ultraviolet rays for 6 minutes, and the hot air non-woven fabric is coated with a 0.075μm nano-titanium dioxide silicone coating. It is compounded for 5.5 minutes under the conditions of 125°C and 0.42 MPa. Then, it is soaked in a 4% silicone softener at 45°C for 25 minutes, and then soaked in a 0.2% silver ion antibacterial agent for 18 minutes, and finally dried at 85°C. The sorted hydrophilic surface layer is cut into a shape with a knitted fabric extension part,

[0068] Step 2: Preparation of the absorption layer. Select high-quality domestic coniferous wood fluff pulp produced in Jilin, put it into a sodium carbonate solution with a concentration of 0.55% and soak for 10 minutes. After rinsing, it is dried at 84°C for 17 minutes. The superabsorbent resin is surface-treated with 0.75% silane coupling agent and dried at 64°C for 2.4 hours.

[0069] Prepare a chitosan solution and a concentrated green tea extract solution. The treated fluff pulp, superabsorbent resin, and polylactic acid diversion filaments with a diameter of 0.3 mm and a spacing of 5 mm are made into an absorption layer through an air-laying process, and then hot-rolled and strengthened under the conditions of 115°C and 0.11 MPa. The hydrophilic spunbond non-woven fabric diversion layer with a weight of 22 g / m 2 of the top layer, the middle absorption layer, and the water-repellent non-woven fabric water-locking layer with a weight of 27 g / m 2 of the bottom layer are compounded;

[0070] The bottom water-repellent non-woven fabric is immersed in the chitosan solution for 2.5 minutes, and then dried at 55°C for 10 minutes to coat its surface with a 0.02 mm thick chitosan coating. The concentrated green tea extract solution is sprayed on the absorption layer (spraying amount: 7.5 g / m 2 ), and then dried at 60°C for 12 minutes, and the performance of the absorption layer is detected.

[0071] Step 3: Preparation of the bottom film layer. Mix the polylactic acid and starch-based composite material in a ratio of 7:3, and add 0.7% antistatic agent and 0.4% lubricant. The bottom film is prepared by the casting method, and the thickness deviation is controlled within ±0.0025 mm. Online stretching is carried out, the longitudinal stretching ratio is 1.3, and the transverse stretching ratio is 1.4, and micro-embossing treatment is carried out. The prepared bottom film layer is cut into a shape with a composite material waterproof layer.

[0072] Step 4: Preparation of the side standing guard and edge wrapping layer. The water-repellent non-woven fabric of the protective outer layer, the foamed cotton of the buffer middle layer, and the soft non-woven fabric of the skin-friendly contact layer are compounded together under the conditions of a hot pressing temperature of 135°C and a pressure of 0.17 MPa. The polypropylene non-woven fabric is pre-stretched by 12%, and then cut into a side standing guard and edge wrapping layer with a specified width and shape.

[0073] Step Five: Overall Assembly: Apply a first hot melt adhesive layer between the bottom film layer, the absorption layer and the hydrophilic surface layer for lamination. Apply a second hot melt adhesive layer on the inner wall of the clamping layer and stick the release paper on it. Bond the side vertical protection edge layer in the clamping layer by tearing off the release paper.

[0074] Step Six: Quality Inspection. Conduct quality inspections on the finished products, including appearance, dimensions, absorption performance, antibacterial performance, leakage prevention performance, etc. Qualified products are packaged and stored in the warehouse.

[0075] It should be noted that in the comparative examples, Comparative Example 1 uses a traditional cotton surface sanitary napkin, and its absorption layer mainly uses ordinary fluff pulp, resulting in a slow conduction speed of liquid in the absorption layer and difficulty in quickly absorbing menstrual blood, with an absorption speed of 15 s. Comparative Example 2 uses a sanitary napkin with an antibacterial surface layer, and its absorption layer uses unoptimized wood pulp fibers combined with a general-performance superabsorbent polymer, which cannot promote the rapid diffusion of liquid, resulting in an absorption speed of 10 s. Example 1 can quickly absorb menstrual blood in only 4 seconds. This is due to the fact that its hydrophilic surface layer is composed of a knitted fabric mixed with bamboo fibers and polyester fibers, which has good water absorption and water conductivity and can quickly introduce menstrual blood into the absorption layer. The absorption speed of Example 2 is 5 seconds. The structure and material characteristics of the hydrophilic surface layer and the absorption layer enable it to quickly absorb menstrual blood. The absorption speed of Example 3 is 5 seconds. The hydrophilic surface layer and the absorption layer work together to achieve rapid absorption, as shown in Table 1 specifically:

[0076] Table 1: Comparison table of menstrual blood absorption speed, absorption capacity, rewet amount and side leakage probability of sanitary napkins

[0077]

[0078] It should be noted that in terms of absorption capacity, the absorption capacity of Example 2 is as high as 75 g, that of Example 3 is 72 g, and that of Example 1 is 70 g. The relatively high absorption capacity is due to the scientific ratio of high-quality fluff pulp and superabsorbent polymer (SAP) in the absorption layer. The absorption capacity of Example 2 is the highest, probably because the quality of its fluff pulp is better and the surface treatment effect of SAP is better, enabling the two to give full play to the water absorption performance after combination. While that of Comparative Example 1 is only 40 g. The ordinary fluff pulp it uses has limited absorption performance itself, and the low-quality sodium polyacrylate-based superabsorbent resin used in combination cannot effectively cope with a large amount of menstrual blood in terms of dosage and performance. That of Comparative Example 2 is 50 g. The unoptimized wood pulp fibers and the general-performance superabsorbent polymer used in the absorption layer fail to achieve good coordination, restricting the improvement of the absorption capacity.

[0079] It should be noted that in terms of the back-seepage amount, the back-seepage amount in Example 2 is as low as 0.3 g, that in Example 3 is 0.4 g, and that in Example 1 is 0.5 g. The low back-seepage amount is mainly because the underlying water-locking layer plays a key role. The chitosan coating applied on the surface of the water-repellent non-woven fabric not only has an antibacterial function but also can effectively prevent liquid back-seepage. At the same time, the internal structure of the absorption layer is compact, and its binding ability to liquid is strong. In Comparative Example 1, the back-seepage amount is as high as 3 g. The water-locking layer uses ordinary polyethylene film, lacking effective water-locking and antibacterial designs such as chitosan coating, and the absorption layer has a loose structure and weak fixing ability to liquid, resulting in a large amount of liquid re-seeping out. In Comparative Example 2, it is 1.5 g. The water-locking layer uses ordinary non-woven fabric without special anti-back-seepage treatment, and the absorption layer has insufficient liquid retention ability, resulting in a relatively high back-seepage amount.

[0080] It should be noted that in terms of the side leakage probability, the side leakage probability in Example 2 is as low as 3%, that in Example 3 is 4%, and that in Example 1 is 5%. The low side leakage probability benefits from the side-standing guard edge layer design. The water-repellent non-woven fabric of the protective outer layer blocks side leakage, the foamed cotton of the buffer intermediate layer provides buffering, and the soft non-woven fabric of the skin-friendly contact layer fits the skin to reduce gaps. In addition, the clamping layer formed by the extension of the knitted fabric of the hydrophilic surface layer and the waterproof layer of the composite material of the bottom film layer firmly fixes the side-standing guard edge layer and improves the overall anti-side leakage performance. In Comparative Example 1, it is as high as 20%. Only ordinary narrow-edge non-woven fabric is relied on the side, lacking effective water-repellent and buffering structures and unable to block side leakage. In Comparative Example 2, it is 10%. The side protection uses ordinary-width non-woven fabric without targeted anti-side leakage design. When the user moves, menstrual blood is likely to flow out from the side.

[0081] It should be noted that in the comparative examples, Comparative Example 1 uses a traditional cotton surface layer sanitary napkin, and its surface layer material has no natural antibacterial property, so the antibacterial rate is only 30%. Comparative Example 2 uses a sanitary napkin with an antibacterial surface layer. Its antibacterial means are relatively single. Maybe only a small amount of antibacterial agent is added to the surface layer, and the quality or effect of the antibacterial agent is not good. The absorption layer is also not fully antibacterial-treated, and the antibacterial rate is 60%. The antibacterial rate of Example 1 is as high as 97%, mainly because the bamboo fiber of the hydrophilic surface layer itself has natural antibacterial properties. Combined with the soaking treatment with 0.1%-0.3% silver ion antibacterial agent in the composite finishing process, it can effectively inhibit the growth of a variety of common bacteria. The antibacterial rate of Example 2 is 95%, which is also the result of the combined action of the bamboo fiber of the hydrophilic surface layer and the silver ion antibacterial agent, as well as the chitosan coating and green tea extract of the absorption layer. However, there are slight differences in the soaking time or concentration of the silver ion antibacterial agent compared with Example 1, resulting in a slightly lower antibacterial rate, but the overall antibacterial effect is still very significant. The antibacterial rate of Example 3 reaches 96%. The antibacterial mechanisms of the hydrophilic surface layer and the absorption layer are similar to those of Example 1 and 2. There are slight differences in the material mixing ratio or processing technology, making the antibacterial effect between Example 1 and 2. Specifically, as shown in Table 2: Table 2: Comparison table of antibacterial rate, air permeability, thickness and weight for sanitary napkins

[0082]

[0083] It should be noted that the air permeability rates of the first, second, and third embodiments are 150 L / (m 2 ·s), 120 L / (m 2 ·s), and 130 L / (m 2 ·s), respectively. The knitted fabric with the hydrophilic surface layer being a mixture of bamboo fiber and polyester fiber is woven with optimized knitting process to incorporate breathable textures. Combining with the air permeability of the hot air non-woven fabric itself, the overall air permeability performance is greatly improved. The multi-layer structure design of the bottom film layer, such as the foamed polypropylene in the buffer layer and the polyethylene film with nano-silica added in the isolation layer, while ensuring functions such as waterproofing, does not affect air circulation. The air permeability rate of the second embodiment is slightly lower, which may be due to differences in the texture density of the knitted fabric, the gram weight of the hot air non-woven fabric, or the thickness ratio of each layer of the bottom film layer compared with the first embodiment; the air permeability rate of the third embodiment is in the middle, which may be due to differences in aspects such as the adjustment of the yarn tension of the knitting equipment and the parameter settings during the preparation of the bottom film by the casting method compared with the first and second embodiments.

[0084] The air permeability rate of Comparative Example 1 is only 50 L / (m 2 ·s). The surface layer material of the traditional sanitary napkin has poor air permeability, the absorption layer has a compact structure, and the bottom film layer uses a single and relatively thick material. Multiple factors hinder the entry and exit of air, and it is easy to generate a stuffy feeling during use. The air permeability rate of Comparative Example 2 is 80 L / (m 2 ·s). Although relatively breathable materials are used, the overall structure design is poor, and it is impossible to construct a good air permeable channel like the embodiment, and the air permeability effect is inferior to the embodiment.

[0085] The thickness of the first embodiment is 0.7 mm. By precisely optimizing each part of the absorption layer, such as reasonably controlling the mixed thickness of fluff pulp and SAP, the size of the polylactic acid diversion filaments and the diamond channels, and precisely controlling the thickness of each layer of materials in the bottom film layer, a relatively thin thickness is achieved, improving the comfort of use. The thicknesses of the second and third embodiments are both 0.8 mm. In the second embodiment, in order to increase the absorption capacity, the amount of fluff pulp or SAP may be appropriately increased in the absorption layer, or in order to enhance the waterproof performance in the bottom film layer, the thickness of each layer of materials is adjusted; during the production of the third embodiment, the structural design of the absorption layer and the bottom film layer is similar to that of the second embodiment, and based on different performance requirements, similar choices are made in the distribution of material thicknesses;

[0086] The thickness of Comparative Example 1 reaches 1.1 mm. To ensure the absorption capacity and leakage prevention effect, the traditional sanitary napkin uses a large amount of unoptimized fluff pulp, and the material of the bottom film layer is single and thick, resulting in a relatively large overall thickness and an obvious sense of heaviness during use. The thickness of Comparative Example 2 is 0.8 mm. The ordinary antibacterial sanitary napkin optimizes the absorption layer material and structure and uses a thinner bottom film layer material, making the thickness close to that of the embodiment, but there is still a gap in the degree of material and structure optimization.

[0087] In Example 1, the weight is 45 g. A hydrophilic surface layer is made by mixing lightweight bamboo fiber and polyester fiber. The amounts and ratios of materials such as fluff pulp, SAP, and polylactic acid diversion filaments in the absorption layer are optimized. A lightweight bottom film layer is used, and polylactic acid and starch-based composite materials are reasonably utilized to effectively control the overall weight, making it more portable while ensuring performance. In Example 2, the weight is 40 g. Further optimization is carried out in material selection and structural design, and the amount of some materials may be reduced without affecting performance, achieving a lighter weight than Example 1 and improving the usability. In Example 3, the weight is 44 g. Due to factors such as different batches of material procurement and slight differences in processing technology, the weight is between Example 1 and Example 2, and it also maintains a relatively light weight.

[0088] In Comparative Example 1, the weight is 60 g. Traditional sanitary napkins use a large amount of heavy materials such as ordinary fluff pulp and lack lightweight design. The bottom film layer is thick, resulting in a large overall weight and inconvenience for users' activities. In Comparative Example 2, the weight is 50 g. Ordinary antibacterial sanitary napkins have made progress in weight control, improved materials and structures, and reduced some unnecessary weight. However, compared with the examples, there is still room for improvement in material optimization and the fineness of structural design.

[0089] Generally speaking, the sanitary napkins in the examples of the present invention show significant advantages in many aspects. In terms of antibacterial performance, the hydrophilic surface layer utilizes the natural antibacterial properties of bamboo fiber and is combined with silver ion antibacterial agent treatment. The absorption layer is paired with a chitosan coating and green tea extract, and their synergistic effect effectively inhibits the growth of bacteria, greatly ensuring menstrual hygiene. In terms of breathability, the optimized combination of knitted fabric and hot air non-woven fabric in the hydrophilic surface layer, combined with the reasonable multi-layer structure design of the bottom film layer, ensures smooth air circulation and significantly reduces the stuffy feeling during use. In terms of thickness control, through the careful optimization of each part of the absorption layer and the bottom film layer, on the basis of ensuring performance such as absorption and leakage prevention, a thin and light design is successfully achieved, greatly improving the use comfort. In terms of weight, lightweight surface layer materials are selected, the materials in the absorption layer are reasonably optimized, and a lightweight bottom film design is adopted. Without affecting the product performance, the overall weight is effectively reduced, facilitating daily carrying and use. Although there are differences in specific details among the examples, each of them brings a better, healthier and more comfortable use experience to users in their respective advantageous fields.

[0090] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. An antibacterial sanitary napkin with a knitted fabric surface layer, comprising a sanitary napkin body (1), characterized in that, The sanitary napkin body (1) sequentially includes a bottom film layer (2), an absorption layer (3), and a hydrophilic surface layer (4) from bottom to top in the orientation during use. A first hot melt adhesive layer is provided between the bottom film layer (2), the absorption layer (3), and the hydrophilic surface layer (4); It further includes a side standing edge protection layer (5). One side of the side standing edge protection layer (5) can be bonded to the sanitary napkin body (1), and the other side extends away from the sanitary napkin body (1).

2. The antibacterial sanitary napkin with a knitted fabric surface layer according to claim 1, characterized in that, A knitted fabric extension part extends outward from the peripheral side of the hydrophilic surface layer (4), and a composite material waterproof layer extends outward from the peripheral side of the bottom film layer (2). A clamping layer for adhesively fixing the side standing edge protection layer (5) is formed between the composite material waterproof layer and the knitted fabric extension part. A second hot melt adhesive layer is coated on the inner wall of the clamping layer, and a release paper is provided on the second hot melt adhesive layer.

3. The antibacterial sanitary napkin with a knitted fabric surface layer according to claim 1, characterized in that, The side standing edge protection layer (5) includes a protective outer layer, a buffer intermediate layer, and a skin-friendly contact layer.

4. The antibacterial sanitary napkin with a knitted fabric surface layer according to claim 2, characterized in that, The extension lengths of the knitted fabric extension part of the hydrophilic surface layer (4) and the composite material waterproof layer of the bottom film layer (2) are the same.

5. The antibacterial sanitary napkin with a knitted fabric surface layer according to claim 1, wherein The polylactic acid diversion filaments of the absorption layer (3) are distributed in a regular array, and the diamond-shaped channels are evenly arranged in the middle area of the absorption layer (3).

6. The antibacterial sanitary napkin with a knitted fabric surface layer according to claim 3, characterized in that, The protective outer layer of the side standing edge protection layer (5) is made of water-repellent non-woven fabric, the buffer intermediate layer is made of foamed cotton, and the skin-friendly contact layer is made of soft non-woven fabric.

7. The preparation method of a bacteriostatic sanitary napkin with a knitted fabric surface layer according to any one of claims 1-6, characterized in that, It includes the following steps: Preparation of the hydrophilic surface layer (4): First, pre-treat bamboo fiber and polyester fiber respectively, and then mix them in proportion; optimize the knitting process using intelligent knitting equipment; pre-treat the knitted fabric and hot air non-woven fabric and then compound them, and then perform softening and antibacterial finishing. Cut the finished hydrophilic surface layer (4) into a shape with a knitted fabric extension part; Preparation of the absorption layer (3): Pre-treat fluff pulp and superabsorbent resin, prepare chitosan solution and green tea extract concentrate; air-lay and hot-roll and reinforce the treated fluff pulp, superabsorbent resin, and polylactic acid diversion filaments and compound three layers of materials, perform chitosan coating treatment on the bottom layer, and perform green tea extract spraying treatment on the absorption layer (3); detect the absorption performance, antibacterial performance, and physical performance of the absorption layer (3); Preparation of the bottom film layer (2): Mix polylactic acid and starch-based composite material with antistatic agent and slip agent, prepare by casting method, optimize the process parameters to control the thickness deviation, perform online stretching and micro-embossing treatment, and cut the prepared bottom film layer (2) into a shape with a composite material waterproof layer; Preparation of the side standing edge protection layer (5): Bond the protective outer layer, the buffer intermediate layer, and the skin-friendly contact layer together by hot pressing process, and then perform pre-stretching treatment on the polypropylene non-woven fabric, and cut it into a side standing edge protection layer (5) with a specified width and shape; Overall assembly: Coat a first hot melt adhesive layer between the bottom film layer (2), the absorption layer (3), and the hydrophilic surface layer (4) for compounding, coat a second hot melt adhesive layer on the inner wall of the clamping layer, and stick on the release paper. According to needs, bond the side standing edge protection layer (5) in the clamping layer by tearing off the release paper; Quality inspection: Conduct quality inspections on the finished products, including appearance, dimensions, absorption performance, antibacterial performance, leakage prevention performance, etc. The qualified products are packaged and stored in the warehouse.

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