A double-winged adhesive sanitary napkin and its preparation method

Abstract

This invention discloses a double-winged adhesive sanitary napkin and its preparation method. The double-winged adhesive sanitary napkin includes a main body with an absorbent core. The absorbent core is composed of an upper PE perforated film, a middle resin particle layer, and a lower flow-guiding nonwoven fabric, forming a sandwich structure. The preparation method of the double-winged adhesive sanitary napkin includes the following steps: S1, preparation of gradient pressure-sensitive adhesive; S2, preparation of release paper composite substrate; S3, preparation of absorbent core; S4, gradient adhesive layer coating; S5, dynamic folding and positioning; S6, intelligent cutting detection; S7, product assembly. This invention incorporates a gradient pressure-sensitive adhesive layer combined with microcapsule phase change material, ensuring strong adhesion between the wings and underwear while reducing skin contact stickiness and allergy risk. The chitosan-modified SAP particles, combined with the airflow-forming flow-guiding layer, significantly increase liquid diffusion speed and effectively reduce side leakage.

Description

Technical Field

[0001] This invention relates to the field of sanitary napkin technology, and in particular to a double-winged adhesive sanitary napkin and its preparation method. Background Technology

[0002] Currently, commercially available sanitary napkins generally use a single or double wing structure to prevent side leakage. The core technical challenges lie in the stability of the fit between the wings and the underwear, the uniformity of the adhesive coating, and the efficiency of the production process.

[0003] The existing technology has the following main problems: 1. Defects in the design of the protective wing adhesive layer. Direct coating with a single viscosity pressure-sensitive adhesive can easily lead to problems such as "over-adhesion" or "insufficient adhesion"; 2. Insufficient environmental friendliness of the release paper. It is non-degradable and difficult to recycle. PE release paper is often used, which does not meet current environmental protection requirements. In addition, it needs to correspond one-to-one with the double protective wings, requiring high cutting precision and increasing equipment complexity; 3. Absorption performance needs to be improved. Traditional SAP granules are used, with a water absorption rate of only 300-400%. The liquid diffusion rate is slow, which can easily lead to side leakage. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a double-winged adhesive sanitary napkin and its preparation method.

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

[0006] A double-winged adhesive sanitary napkin includes a sanitary napkin body, the sanitary napkin body having an absorbent core, the absorbent core being composed of an upper PE perforated film, a middle resin particle layer and a lower flow-guiding nonwoven fabric, forming a sandwich structure, and the water absorption rate of the resin particle layer is not less than 500%.

[0007] A pair of protective wings are symmetrically arranged on both sides of the sanitary napkin body. The connection between the protective wings and the sanitary napkin body is provided with two pressure-sensitive adhesive layers. The pressure-sensitive adhesive layer is composed of an outer high viscosity area and an inner low viscosity area to form a gradient structure. The viscosity of the outer high viscosity area is greater than or equal to 3000 mPa·s, and the viscosity of the inner low viscosity area is less than or equal to 1500 mPa·s.

[0008] Release paper, wherein the release paper is a substrate made of polylactic acid and bamboo fiber in a mass ratio of 7:3, and its surface is coated with a nano-SiO2 release coating with a solid content of 1.5-2.5%. The thickness of the release paper is 35-45μm, and the side of the release paper that contacts the protective wing is provided with an anti-stick positioning line with a width of 0.5-1.2mm. The spacing between adjacent positioning lines is adapted to the folding angle of the protective wing of 85°-95°.

[0009] Preferably, the pressure-sensitive adhesive layer contains uniformly dispersed microcapsule phase change material, the particle size of which is 10-30 μm and its loading is 5-8% of the total mass of the pressure-sensitive adhesive layer.

[0010] Preferably, the PE perforated membrane has a pore size of 0.1-0.3 mm and a perforation rate of 15-25%; the flow-guiding nonwoven fabric has a unit area mass of 30-50 g / m³. 2 .

[0011] Preferably, the lipid particle layer is modified with chitosan, and the particle size of the chitosan-modified particles is 150-200 μm, with a unit area mass of 80-120 g / m² in the absorbent core. 2 .

[0012] Preferably, the length of the protective wing is 80-120mm, the width is 20-30mm, and the length of the folded wing that fits with the main body of the sanitary napkin is 40-60mm.

[0013] A method for preparing a double-winged adhesive sanitary napkin includes the following steps:

[0014] S1. Gradient pressure-sensitive adhesive preparation: Styrene-isoprene-styrene block copolymer and tackifying resin are mixed at a mass ratio of 1:0.8-1.2, and then menthol microcapsules with a particle size of 10-30μm are added. The mixture is then melt-blended at a temperature of 150-180℃ using a screw extruder to prepare the gradient pressure-sensitive adhesive.

[0015] S2. Preparation of release paper composite substrate: Polylactic acid and bamboo fiber are mixed at a mass ratio of 7:3 to form base paper through a wet papermaking process. The base paper is then immersed in nano-SiO2 sol for impregnation and coating, and then hot-pressed at a temperature of 110-130℃ to obtain release paper composite substrate.

[0016] S3. Absorbent core preparation: An airflow web-forming process is used to composite chitosan-modified SAP particles with a flow-guiding nonwoven fabric, resulting in a unit area mass of 80-120 g / m². 2 Absorbing core composite layer;

[0017] S4. Gradient adhesive layer coating: The gradient pressure-sensitive adhesive prepared above is simultaneously coated on both sides of the release paper using a micro-gravure coating machine, and the thickness difference of the adhesive layer is controlled within the range of ±0.01mm.

[0018] S5. Dynamic folding and positioning: The protective wings are folded using a negative pressure conveying roller. The folding angle of the protective wings is monitored in real time by a pressure sensor, and the folding angle control accuracy is maintained at ±0.5°. At the same time, the protective wings are assisted in alignment using an airflow auxiliary nozzle with an air pressure of 0.2-0.3MPa. The vacuum degree of the negative pressure conveying roller is maintained at -0.05 to -0.08MPa.

[0019] S6. Intelligent cutting and detection: Online detection of adhesive layer defects through a hyperspectral imaging system, and dynamic adjustment of the cutting position in conjunction with the servo cutter head;

[0020] S7. Product assembly: Assemble the release paper coated with adhesive, the folded and positioned wings, and the prepared absorbent core to form a finished double-winged adhesive sanitary napkin. The matching error between the release paper cutting speed and the sanitary napkin body conveying speed is controlled within ≤±0.5mm / s, and the bonding accuracy between the release paper and the wings after cutting is controlled within ≤±0.3mm.

[0021] Preferably, the screw speed of the screw extruder is 150-200 r / min and the length-to-diameter ratio is 25-30.

[0022] Preferably, in the wet papermaking process, the slurry concentration is controlled at 0.8-1.2%, and the papermaking machine speed is 80-120 m / min.

[0023] Preferably, the depth of the cells in the microgravure coating machine is 30-50 μm, and the number of lines is 200-300 lines / cm.

[0024] Preferably, the hot pressing pressure is 2-3 MPa and the time is 10-15 s.

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

[0026] 1. This invention features a gradient pressure-sensitive adhesive layer combined with microcapsule phase change material, which ensures strong adhesion between the wings and underwear while reducing skin contact stickiness and allergy risk. The chitosan-modified SAP particles work in conjunction with the airflow mesh guiding layer to increase the liquid diffusion rate by 40% and effectively reduce side leakage.

[0027] 2. This invention features PLA / bamboo fiber release paper: compostable and degradable for ≤6 months, replacing traditional PE release paper, solving the problem of white pollution, and increasing the material recycling rate to 92%; at the same time, it features anti-stick positioning lines: reducing the amount of release paper used by 15%, while ensuring the precise folding angle of the protective wings and avoiding waste of adhesive layer.

[0028] 3. The present invention features a sandwich absorbent core: a combination of a PE perforated membrane and a flow-guiding nonwoven fabric, which increases menstrual blood permeability by 25%. In terms of wing size design, the folded fit length is 40-60mm. With the addition of anti-stick positioning lines, the wing displacement rate is reduced from 22% to 5%, improving the applicability for sports scenarios. Attached Figure Description

[0029] Figure 1 This is a structural disassembly diagram of a double-winged adhesive sanitary napkin proposed in this invention;

[0030] Figure 2 This is a schematic diagram of the structural assembly of a double-winged adhesive sanitary napkin proposed in this invention;

[0031] Figure 3 This is a schematic diagram of the wing structure of a double-winged adhesive sanitary napkin proposed in this invention.

[0032] In the diagram: 1. Main body of sanitary napkin; 2. Wings; 3. Resin granule layer; 4. PE perforated film; 5. Non-woven fabric for drainage; 6. Pressure-sensitive adhesive layer; 601. Outer high viscosity area; 602. Inner low viscosity area; 7. Absorbent core; 8. Ventilation holes; 9. Release paper. Detailed Implementation

[0033] 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.

[0034] Reference Figure 1-3 A type of double-winged adhesive sanitary napkin, comprising:

[0035] The sanitary napkin body 1 has an absorbent core 7, which is composed of an upper PE perforated film 4, a middle resin particle layer 3 and a lower flow-guiding nonwoven fabric 5, forming a sandwich structure, and the water absorption ratio of the resin particle layer is not less than 500%.

[0036] The PE perforated membrane 4 has a pore size of 0.1-0.3 mm and a perforation rate of 15-25%; the flow-guiding nonwoven fabric 5 has a unit area mass of 30-50 g / m³. 2 The lipid particle layer 3 is modified with chitosan, and the particle size of the chitosan-modified particles is 150-200 μm, with a unit area mass of 80-120 g / m² in the absorber core 7. 2 .

[0037] A pair of protective wings 2 are symmetrically arranged on both sides of the sanitary napkin body 1. The length of the protective wings 2 is 80-120mm and the width is 20-30mm. After folding, the length of the protective wings that fits with the sanitary napkin body 1 is 40-60mm. There are two pressure-sensitive adhesive layers 6 at the connection between the protective wings 2 and the sanitary napkin body 1. Microcapsule phase change material is uniformly dispersed in the pressure-sensitive adhesive layer 6. The particle size of the microcapsule phase change material is 10-30μm, and its loading is 5-8% of the total mass of the pressure-sensitive adhesive layer 6. The pressure-sensitive adhesive layer 6 is composed of an outer high viscosity region 601 and an inner low viscosity region 602 to form a gradient structure. The viscosity of the outer high viscosity region 601 is greater than or equal to 3000mPa·s, and the viscosity of the inner low viscosity region 602 is less than or equal to 1500mPa·s.

[0038] Release paper 9 is a substrate made of polylactic acid and bamboo fiber in a mass ratio of 7:3. Its surface is coated with a nano-SiO2 release coating with a solid content of 1.5-2.5%. The thickness of release paper 9 is 35-45μm. On the side of release paper 9 that contacts the protective wing 2, there are anti-stick positioning lines with a width of 0.5-1.2mm. The spacing between adjacent positioning lines is adapted to the folding angle of the protective wing of 85°-95°.

[0039] A method for preparing a double-winged adhesive sanitary napkin includes the following steps:

[0040] S1. Preparation of gradient pressure-sensitive adhesive: Styrene-isoprene-styrene block copolymer and tackifying resin are mixed at a mass ratio of 1:0.8-1.2, and then menthol microcapsules with a particle size of 10-30 μm are added. The mixture is then melt-blended using a screw extruder at a temperature of 150-180℃ to prepare the gradient pressure-sensitive adhesive. The screw speed of the extruder is 150-200 r / min, and the aspect ratio is 25-30.

[0041] S2. Preparation of release paper composite substrate: Polylactic acid and bamboo fiber are mixed at a mass ratio of 7:3 to form base paper through a wet papermaking process. The base paper is then immersed in nano-SiO2 sol for impregnation and coating, and then hot-pressed at a temperature of 110-130℃ to obtain the release paper composite substrate. In the wet papermaking process, the slurry concentration is controlled at 0.8-1.2%, and the papermaking speed is 80-120m / min.

[0042] S3. Absorbent core preparation: An airflow web-forming process is used to composite chitosan-modified SAP particles with a flow-guiding nonwoven fabric, resulting in a unit area mass of 80-120 g / m². 2 Absorbing core composite layer;

[0043] S4. Gradient adhesive coating: The gradient pressure-sensitive adhesive prepared above is simultaneously coated on both sides of the release paper using a microgravure coating machine. The thickness difference of the adhesive layer is controlled within ±0.01mm. The cell depth of the microgravure coating machine is 30-50μm and the line count is 200-300 lines / cm.

[0044] S5. Dynamic folding and positioning: The protective wings are folded using a negative pressure conveying roller. The folding angle of the protective wings is monitored in real time by a pressure sensor, and the folding angle control accuracy is maintained at ±0.5°. At the same time, the protective wings are assisted in alignment using an airflow auxiliary nozzle with an air pressure of 0.2-0.3MPa. The vacuum degree of the negative pressure conveying roller is maintained at -0.05 to -0.08MPa.

[0045] S6. Intelligent cutting and detection: Online detection of adhesive layer defects through a hyperspectral imaging system, and dynamic adjustment of the cutting position in conjunction with the servo cutter head;

[0046] S7. Product Assembly: Assemble the release paper coated with adhesive, the folded and positioned wings, and the prepared absorbent core to form a finished double-winged adhesive sanitary napkin. The matching error between the release paper cutting speed and the sanitary napkin body conveying speed is controlled within ≤±0.5mm / s. The bonding accuracy between the cut release paper and the wings is controlled within ≤±0.3mm. The heat-pressing pressure is 2-3MPa, and the time is 10-15s.

[0047] Example 1

[0048] High comfort gradient adhesive layer test

[0049] To verify the synergistic effect of the gradient adhesive layer and chitosan-modified SAP on improving comfort and leak prevention, this embodiment sets up an experimental group, control group 1, and control group 2 for various data testing experiments, wherein:

[0050] The experimental group of sanitary napkins included the following proposed in this invention: gradient pressure-sensitive adhesive: SIS-based adhesive (outer side 3200 mPa·s) + PCM modified adhesive (inner side 1200 mPa·s, 6% menthol microcapsule loading); absorbent core: chitosan-modified SAP (particle size 180 μm, absorbency 500%) and 40 g / m². 2 Airflow-guided nonwoven fabric forming web; Release paper: PLA / bamboo fiber (7:3) composite substrate, nano-SiO2 coating with a solid content of 2.0%.

[0051] The sanitary napkins in control group 1 consisted of: uniform pressure-sensitive adhesive (2500 mPa·s); ordinary SAP (particle size 150 μm, water absorption rate 400%); and PE release paper.

[0052] The sanitary napkins in control group 2 consisted of: gradient pressure-sensitive adhesive (outer side 3200 mPa·s + inner side 1200 mPa·s); ordinary SAP (particle size 150 μm, absorbency 400%); and PE release paper.

[0053] The tests included: skin allergy test, contact adhesion rating, liquid diffusion test, and side leakage test. The testing method involved selecting 50 volunteers in each group and having them use the sanitary napkins for 7 consecutive days. The skin allergy test recorded allergic reactions such as erythema and itching; the contact adhesion rating test involved volunteers subjectively rating the reaction on a scale of 1-5; the liquid diffusion test used a test solution to simulate menstrual blood (pH 7.4, viscosity 3.5 mPa·s), recording the time it took for the diffusion diameter to reach 50 mm; the side leakage test involved a 50 ml impact of simulated menstrual blood (angle 45°, speed 1.2 m / s), with a leakage volume > 0.5 ml considered a failure. The results of each test are shown in the table below.

[0054] Table 1: Statistical Table of Adhesive Layer Test Results

[0055] Test items / groups experimental group Control group 1 Control group 2 Incidence of allergies (%) 2.5 12.0 8.5 Viscosity score (mean) 1.8 3.2 2.4 Diffusion time (seconds) 8 15 12 Side leakage rate (%) 8.0 28.0 18.0

[0056] According to the data in the table above, the allergy rate in the experimental group was reduced by 79% (p < 0.001) and the adhesion score was reduced by 44% (p < 0.001) compared to the control group 1. This indicates that the gradient adhesive layer and PCM material significantly improved the skin contact experience. The chitosan-modified SAP shortened the diffusion time by 47% (p < 0.001) and reduced the side leakage rate by 71% (p < 0.001), verifying the synergistic effect of the materials. Therefore, the combination of the gradient adhesive layer and chitosan-modified SAP achieves a dual breakthrough in comfort and leak prevention, representing a significant improvement over existing technologies.

[0057] Example 2

[0058] Environmentally friendly PLA release paper sanitary napkin test

[0059] To verify the environmental performance and process compatibility of the environmentally friendly PLA release paper sanitary napkin, this embodiment sets up an experimental group, control group 1, and control group 2 to conduct various data testing experiments, wherein:

[0060] The sanitary napkins in the experimental group include those proposed in this invention: release paper: PLA / bamboo fiber (7:3), nano-SiO2 coating with a solid content of 1.8%; anti-stick positioning lines: 1.0 mm wide, with spacing matching the folding angle of the wings at 85°.

[0061] The sanitary napkins in control group 1 consisted of PE release paper (50μm thick) and no positioning lines.

[0062] The sanitary napkins in control group 2 consisted of PLA / bamboo fiber (5:5) release paper and ordinary coating (without nano SiO2).

[0063] The tests included: degradation test, material recovery rate, release paper usage, and folding accuracy. Each test in each group used 50 sanitary napkins. The degradation test involved monitoring the mass loss rate and recording the degradation time under composting conditions (58℃, 75%). The material recovery rate test involved calculating the fiber retention rate after an industrial recycling process. The release paper usage test involved recording the weight of the release paper used. The folding accuracy test involved measuring the folding angle of the wings using a laser displacement sensor. The test results are shown in the table below.

[0064] Table 2: Statistical Table of Test Results for Release Paper Sanitary Napkins

[0065] Test items / groups experimental group Control group 1 Control group 2 Degradation time (months) 5.5 Non-degradable 7.2 Recovery rate (%) 92 5 85 Release paper usage (g) 0.8 1.0 0.9 Folding error (mm) ±0.2 ±0.5 ±0.3

[0066] According to the data in the table above, the degradation time of the release paper in the experimental group was shortened by 24% compared with the control group 2 (p<0.001), and the recovery rate was increased by 8.2% (p<0.001), demonstrating the best environmental performance and verifying the optimality of the 7:3 ratio. Furthermore, the anti-stick positioning line reduced the amount of release paper used by 20% (p<0.001) and reduced folding error by 60% (p<0.001), improving production efficiency and enhancing process adaptability. Therefore, PLA / bamboo fiber release paper is superior to traditional materials in both environmental performance and process adaptability, possessing industrialization feasibility.

[0067] Example 3

[0068] Sanitary napkin production efficiency test

[0069] To verify the efficiency and cost improvement effects of intelligent manufacturing processes, this embodiment sets up an experimental group, a control group 1, and a control group to conduct production efficiency tests, wherein:

[0070] The sanitary napkin production steps of the experimental group include those proposed in this invention: dynamic negative pressure folding: vacuum degree -0.06MPa, airflow-assisted air pressure 0.25MPa; hyperspectral detection: scanning speed 50m / min; microgravure coating: cell depth 40μm, line count 250 lines / cm.

[0071] The production steps of sanitary napkins in control group 1 include: mechanical folding: cam mechanism (accuracy ±1°); manual inspection: sampling rate 30%; scraper coating: adhesive layer thickness difference ±0.05mm.

[0072] The production steps of the sanitary napkins in control group 2 include: dynamic negative pressure folding: vacuum degree -0.06MPa; manual inspection: sampling rate 30%; microgravure coating: mesh depth 40μm.

[0073] The test items included: scrap rate statistics, overall equipment efficiency, unit package cost, and production speed. The scrap rate statistics test method involved counting the number of defective products out of 100,000 units produced continuously. The overall equipment efficiency test method was: Overall Equipment Efficiency = Time Utilization Rate × Performance Utilization Rate × Yield Rate. The unit package cost test method calculated the comprehensive costs of materials, labor, and energy consumption. The production speed test method recorded the maximum stable speed (pieces / minute) during continuous production. The test results are shown in the table below.

[0074] Table 3: Statistical Table of Sanitary Napkin Production Efficiency Test Results

[0075] Test items / groups experimental group Control group 1 Control group 2 Scrap rate (%) 0.08 0.8 0.2 Overall equipment efficiency (%) 96 75 88 Cost per package (RMB) 0.92 1.05 0.98 Production speed (pieces / minute) 1200 800 1000

[0076] According to the data in the table above, intelligent detection reduces the scrap rate by 90% (p < 0.001), improves OEE by 28% (p < 0.001), increases production speed by 50% (p < 0.001), and reduces adhesive usage by 20% in microgravure coating, resulting in a 12.4% reduction in cost per package (p < 0.001). Therefore, the intelligent production process proposed in this invention significantly improves production efficiency and reduces costs, validating the economic advantages of the invention.

[0077] 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 double-winged adhesive sanitary napkin, characterized in that, include: The sanitary napkin body (1) has an absorbent core (7), which is composed of an upper PE perforated film (4), a middle resin particle layer (3) and a lower flow-guiding nonwoven fabric (5) to form a sandwich structure. The water absorption ratio of the resin particle layer (3) is not less than 500%. The resin particle layer (3) is modified with chitosan, and the particle size of the chitosan modified particles is 150-200μm. The unit area mass in the absorbent core (7) is 80-120g / m². A pair of protective wings (2) are symmetrically arranged on both sides of the sanitary napkin body (1). The protective wings (2) are connected to the sanitary napkin body (1) with a double pressure-sensitive adhesive layer (6). The pressure-sensitive adhesive layer (6) is composed of an outer high-viscosity region (601) and an inner low-viscosity region (602) forming a gradient structure. The viscosity of the outer high-viscosity region (601) is greater than or equal to 3000 mPa·s, and the viscosity of the inner low-viscosity region (602) is less than or equal to 1500 mPa·s. Microcapsule phase change material is uniformly dispersed in the pressure-sensitive adhesive layer (6). The particle size of the microcapsule phase change material is 10-30 μm, and its loading is 5-8% of the total mass of the pressure-sensitive adhesive layer (6). Release paper (9), the release paper (9) is a substrate made of polylactic acid and bamboo fiber in a mass ratio of 7:3, its surface is coated with nano SiO2 release coating, the solid content of the coating is 1.5-2.5%, the thickness of the release paper (9) is 35-45μm, and the release paper (9) has anti-stick positioning lines with a width of 0.5-1.2mm on the side in contact with the protective wing (2), the spacing between adjacent positioning lines is adapted to the folding angle of the protective wing (2) of 85°-95°.

2. The double-winged adhesive sanitary napkin according to claim 1, characterized in that, The PE perforated membrane (4) has a pore size of 0.1-0.3 mm and a perforation rate of 15-25%; the flow-guiding nonwoven fabric (5) has a unit area mass of 30-50 g / m².

3. A double-winged adhesive sanitary napkin according to claim 1, characterized in that, The length of the protective wing (2) is 80-120mm, the width is 20-30mm, and the length of the folded wing that fits with the main body of the sanitary napkin (1) is 40-60mm.

4. A method for preparing a double-winged adhesive sanitary napkin as described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Gradient pressure-sensitive adhesive preparation: Styrene-isoprene-styrene block copolymer and tackifying resin are mixed at a mass ratio of 1:0.8-1.2, and then menthol microcapsules with a particle size of 10-30μm are added. The mixture is then melt-blended at a temperature of 150-180℃ using a screw extruder to prepare the gradient pressure-sensitive adhesive. S2. Preparation of release paper composite substrate: Polylactic acid and bamboo fiber are mixed at a mass ratio of 7:3 to form base paper through a wet papermaking process. The base paper is then immersed in nano-SiO2 sol for impregnation and coating, and then hot-pressed at a temperature of 110-130℃ to obtain release paper composite substrate. S3. Preparation of the absorbent core: The chitin-modified SAP particles are combined with the flow-guiding nonwoven fabric using an airflow web forming process to obtain an absorbent core composite layer with a unit area mass of 80-120 g / m². S4. Gradient adhesive layer coating: The gradient pressure-sensitive adhesive prepared above is simultaneously coated on both sides of the release paper using a micro-gravure coating machine, and the thickness difference of the adhesive layer is controlled within the range of ±0.01mm. S5. Dynamic folding and positioning: The protective wings are folded using a negative pressure conveying roller. The folding angle of the protective wings is monitored in real time by a pressure sensor, and the folding angle control accuracy is maintained at ±0.5°. At the same time, the protective wings are assisted in alignment using an airflow auxiliary nozzle with an air pressure of 0.2-0.3MPa. The vacuum degree of the negative pressure conveying roller is maintained at -0.05 to -0.08MPa. S6. Intelligent cutting and detection: Online detection of adhesive layer defects through a hyperspectral imaging system, and dynamic adjustment of the cutting position in conjunction with the servo cutter head; S7. Product assembly: Assemble the release paper coated with adhesive, the folded and positioned wings, and the prepared absorbent core to form a finished double-winged adhesive sanitary napkin. The matching error between the release paper cutting speed and the sanitary napkin body conveying speed is controlled within ≤±0.5mm / s, and the bonding accuracy between the release paper and the wings after cutting is controlled within ≤±0.3mm.

5. The method for preparing a double-winged adhesive sanitary napkin according to claim 4, characterized in that, The screw extruder has a screw speed of 150-200 r / min and a length-to-diameter ratio of 25-30.

6. The method for preparing a double-winged adhesive sanitary napkin according to claim 4, characterized in that, In the wet papermaking process, the slurry concentration is controlled at 0.8-1.2%, and the papermaking machine speed is 80-120m / min.

7. The method for preparing a double-winged adhesive sanitary napkin according to claim 4, characterized in that, The microgravure coating machine has a cell depth of 30-50μm and a line count of 200-300 lines / cm.

8. The method for preparing a double-winged adhesive sanitary napkin according to claim 4, characterized in that, The hot pressing pressure is 2-3 MPa, and the time is 10-15 seconds.

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