Breathable and cool spun-bonded non-woven fabric and pants-type sanitary towel

Abstract

The invention relates to the field of hygienic products, provides a breathable cool spun-bonded non-woven fabric and a pants-type sanitary towel, and solves the problems that existing menstrual pants are poor in breathability and leakproof performance and strong in stuffiness feeling, and it is difficult to give consideration to lasting cool feeling and high breathability. Comprising a base material and a cooling microcapsule coated on the base material, the base material is spun-bonded non-woven fabric formed by lapping composite fibers, the cross section of each composite fiber is triangular, inward grooves are formed in the three corners of each triangle, and cooling microcapsules are contained in the inward grooves; the composite fiber is formed by combining a first melt and a second melt in a parallel mode in the extrusion process. The coating weight of the cooling microcapsule is 3-5g / m < 2 >; the air permeability of the spun-bonded non-woven fabric is larger than or equal to 4000 mm / s.

Description

Technical Field

[0001] This invention relates to the field of hygiene products, and more particularly to a breathable and cooling spunbond nonwoven fabric and a panty-style sanitary napkin. Background Technology

[0002] Menstrual panties are an important hygiene product for women during their menstrual cycle, and their performance directly affects the user's comfort and experience. Currently, there is still room for improvement in the breathability and leak-proof properties of menstrual panties on the market. A hot and humid environment can easily lead to skin discomfort and even allergies; side leakage and back leakage also cause women considerable distress and embarrassment. Therefore, developing a new technology that can effectively improve the breathability and leak-proof properties of menstrual panties is of significant practical importance.

[0003] Chinese Patent Publication No. CN216724966U discloses a nonwoven menstrual pant, including a pant body and an absorbent core disposed in the middle of the pant body. Leg openings are arranged on both sides of the lower end of the pant body, and the upper end of the pant body is constructed as elastic side panels for conforming to the waist and abdomen, with the elastic side panels forming a waist opening. The pant body includes at least an inner waistband nonwoven fabric and an outer waistband nonwoven fabric that are heat-pressed together. Both the inner and outer waistband nonwoven fabrics are elastic nonwoven fabrics, with their front and rear ends folded inward to form an inner bend and an outer bend, respectively. The inner waistband nonwoven fabric and its inner bend are bonded between the outer waistband nonwoven fabric and its outer bend, and a waistband elastic band is also bonded between the outer waistband nonwoven fabric and its outer bend. This design improves the tensile recovery force of the elastic side panels, providing elasticity while dispersing overall stress, eliminating noticeable constriction and enhancing comfort. However, the waist and leg openings of these menstrual pants are often made of ordinary spunbond nonwoven fabric, which can feel stuffy and hot when worn.

[0004] Chinese Patent Publication No. CN221083987U discloses a breathable menstrual pant, comprising a pant-shaped main body, a cooling elastic waistband on the upper end of the main body for securing the main body to the body when worn and providing a cooling sensation upon contact with the body, and an absorbent portion on the inner surface of the main body for absorbing bodily secretions. The absorbent portion includes a waterproof and breathable bottom layer on the inner surface of the main body, a liquid-permeable top layer on the waterproof and breathable bottom layer, an absorbent body between the waterproof and breathable bottom layer and the liquid-permeable top layer for absorbing bodily secretions, and a guide device on the absorbent body for guiding the secretions to spread towards the front and rear ends of the absorbent body when it absorbs secretions. However, the cooling sensation of this menstrual pant does not have a lasting, stable, and slow-release function, and its leak-proof performance is poor. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention provides a breathable and cool spunbond nonwoven fabric and panty-style sanitary napkin, which solves the problems of poor breathability and leak prevention, strong stuffiness, and difficulty in achieving both long-lasting coolness and high breathability in existing menstrual panties.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A breathable and cooling spunbond nonwoven fabric includes a substrate and cooling microcapsules coated on the substrate. The substrate is a spunbond nonwoven fabric formed by web laying of composite fibers. The cross-section of the composite fibers is triangular, and each of the three corners of the triangle has an inward groove. The inward groove contains cooling microcapsules, and the content of cooling microcapsules in the inward groove is ≥80%. The composite fibers are formed by combining a first melt and a second melt in a parallel manner during extrusion. The coating amount of the cooling microcapsules is 3-5 g / m². 2 The air permeability of the spunbond nonwoven fabric is ≥4000mm / s.

[0008] Furthermore, the radius of the inward groove is approximately 2-15 μm.

[0009] Furthermore, the cooling microcapsule comprises a core material and a wall material, wherein the core material is menthol and the wall material is chitosan; the particle size of the cooling microcapsule is 1-10 μm.

[0010] Furthermore, the basis weight of the spunbond nonwoven fabric is 6-15 g / m². 2 .

[0011] Furthermore, the fineness of the composite fiber is 0.8-2.0 dtex.

[0012] Furthermore, the first melt is polypropylene, and the second melt is polyethylene.

[0013] A panty-style sanitary napkin includes a menstrual panty body, a waistband portion disposed on the menstrual panty body, and a leak-proof side panel, wherein at least a portion of the waistband portion and / or the leak-proof side panel is made of the breathable and cool spunbond nonwoven fabric.

[0014] Furthermore, the air permeability of the waist section is not less than 1300mm / s.

[0015] Furthermore, the leak-proof partition is a double-layer T-shaped leak-proof partition, which is folded in a T-shape with a folding height of 3-5cm; the folded part of the leak-proof partition is covered with elastic PU foam material, and the stretch ratio of the elastic PU foam material is 1.5-2.5 times.

[0016] The aforementioned breathable and cooling spunbond nonwoven fabric is applied to the waistband and leak-proof side panels of panty-style sanitary napkins. The high breathability of the waistband greatly improves the stuffiness in the waist and abdomen area. The double-layer T-shaped leak-proof side panel design, combined with the high elongation ratio elastic PU foam material wrapped at the fold, provides excellent side and back leakage prevention functions. At the same time, its elastic material and structure can effectively distribute pressure and avoid causing marks on the leg skin, achieving a balance between leak prevention function and wearing comfort.

[0017] The above-described method for preparing a breathable and cooling spunbond nonwoven fabric includes the following steps:

[0018] S1. Raw material preparation and melting: Polypropylene and polyethylene are fed into different screw extruders for melting to obtain the first melt and the second melt, respectively.

[0019] S2, Composite spinning: The first melt and the second melt obtained in step S1 are combined and spun in parallel through a composite spinneret with triangular spinneret holes in a 1:1 ratio. The internal flow channel of the composite spinneret allows the first melt and the second melt to combine in parallel during the extrusion process to form a composite fiber with a triangular cross section and inward grooves at all three corners of the triangle.

[0020] S3, Stretching and Cooling: The composite fibers extruded from the composite spinneret are stretched and refined under the action of high-speed airflow, and at the same time, they are rapidly cooled and shaped by side-blown cold air.

[0021] S4. Web Forming and Reinforcement: The cooled and shaped composite fibers are evenly laid on a web forming curtain under the guidance of airflow to form a fiber web. The fiber web is then sent to a hot rolling mill for hot rolling reinforcement to obtain the initial nonwoven fabric.

[0022] S5. Microcapsule coating: Immerse a rubber coating roller with a textured surface into a cooling microcapsule finishing liquid, and coat the cooling microcapsule finishing liquid onto the surface of the initial nonwoven fabric by roller coating. The rubber coating roller is equipped with an ultrasonic vibration device, and low-frequency ultrasonic vibration is applied during the coating process to make the cooling microcapsule finishing liquid more easily overcome surface tension and enter the inward groove.

[0023] S6. Drying treatment: The microcapsule-coated primary nonwoven fabric is placed in a hot air circulating dryer and dried to obtain a breathable and cool spunbond nonwoven fabric.

[0024] The ultrasonic-assisted coating process ensures a high loading rate and firmness of the cooling microcapsules within the grooves; the preparation process of the cooling microcapsule finishing solution is as follows:

[0025] I. Core Material Treatment: Menthol is used as the core material. It is placed in a vacuum drying oven and dried at 40-50℃ for 2-3 hours to remove moisture and volatile impurities, thereby improving the purity and stability of the core material. The dried menthol extract is filtered through a filter membrane to further remove impurities and obtain the core material solution.

[0026] II. Preparation of Wall Material Solution: Chitosan is selected as the wall material. Chitosan is added to a 1%-2% acetic acid solution and stirred until completely dissolved to prepare a chitosan solution with a mass concentration of 2%-5%. During stirring, the solution is heated to 30℃-40℃ to accelerate the dissolution rate. Then, Tween 80 emulsifier is added to the chitosan solution. The amount of emulsifier added is 1%-3% of the mass of the wall material. Stirring is continued for 30-60 minutes to ensure that the emulsifier is evenly dispersed in the wall material solution, thus obtaining the wall material solution.

[0027] III. Emulsification and Dispersion: The core material solution obtained in step I is slowly added to the wall material solution obtained in step II. The mass ratio of core material to wall material is controlled at 1:(2-4) to obtain a mixed solution. Then, the mixed solution is placed in a high-speed shear emulsifier and emulsified for 15-30 minutes at a speed of 3000-5000 r / min, so that the core material is uniformly wrapped in the droplets formed by the wall material to form a stable O / W type emulsion.

[0028] IV. Curing and Molding: Add glutaraldehyde solution as a crosslinking agent to the O / W type emulsion obtained in step III. The amount of crosslinking agent added is 5%-10% of the wall material mass. React for 1-2 hours under a stirring speed of 500-1000 r / min to allow the wall material to undergo a crosslinking reaction and form a microcapsule shell with certain strength and stability. After the reaction is completed, let the solution stand and cool to room temperature to obtain a cool microcapsule suspension.

[0029] V. Separation and Drying: The cooling microcapsule suspension is centrifuged at 3000-4000 r / min for 10-15 minutes. The supernatant is removed to obtain microcapsule precipitate. The microcapsule precipitate is washed with deionized water 2-3 times to remove residual cross-linking agents and other impurities. The washed microcapsule precipitate is placed in a freeze dryer and dried at -40℃ to -50℃ and a vacuum degree of 10-20 Pa for 8-12 hours to obtain dried cooling microcapsule powder.

[0030] VI. Preparation of Cooling Microcapsule Finishing Solution: Dry cooling microcapsule powder is dispersed in water, a dispersant and a thickener are added, and the mixture is stirred until homogeneous. The viscosity of the finishing solution is controlled at 200-500 mPa·s to obtain the cooling microcapsule finishing solution. The dispersant is sodium polyacrylate, added at 0.5%-1% of the mass of the cooling microcapsule powder; the thickener is hydroxyethyl cellulose, added at 0.1%-0.3% of the mass of water.

[0031] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows:

[0032] 1. Spunbond nonwoven fabric is made from composite fibers with triangular cross-sections and inward grooves at all three corners of the triangle. The bicomponent fibers with different melting points form tiny curled and fluffy spaces. Due to its unique triangular cross-section structure, the gaps between the fibers are increased, improving fluffiness and curl. Compared with nonwoven fabric made from ordinary round fibers, the nonwoven fabric can significantly improve breathability and effectively solve the problem of stuffiness and dampness in traditional menstrual pants.

[0033] 2. The three corners of the triangle have inward grooves. The inward grooves can better accommodate and fix the microcapsules, prevent the coating of the microcapsules from affecting the gaps between the substrate fibers, and maintain the breathability.

[0034] 3. Microcapsules made with menthol, a natural plant extract, are securely fixed in fiber grooves. During use, through human friction or temperature changes, the microcapsules can stably and slowly release the cooling ingredients. This avoids the rapid loss of cooling ingredients and ensures the longevity of the effect. On the other hand, the gentle release characteristics also prevent an excessively strong instantaneous irritation, improving the comfort and safety of use.

[0035] 4. The leak-proof side panel uses double-layer T-shaped leak-proof side panel non-woven fabric. Its folding shape is T-shaped, and the fold is covered with elastic PU foam material, which has the characteristics of leak-proof, breathable and not easy to leave marks when used. Attached Figure Description

[0036] Figure 1 This is a schematic cross-sectional view of a composite fiber with a triangular cross-section in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the planar structure of the pant-style sanitary napkin in an embodiment of the present invention;

[0038] Figure 3 This is a schematic cross-sectional view of the pant-style sanitary napkin in an embodiment of the present invention;

[0039] The labels in the diagram are as follows: 1-Inward groove, 2-Menstrual panty body, 3-Waistband, 4-Leak-proof side panel, 5-Elastic PU foam material. Detailed Implementation

[0040] Example 1

[0041] refer to Figure 1 A breathable and cooling spunbond nonwoven fabric includes a substrate and cooling microcapsules coated on the substrate. The substrate is a spunbond nonwoven fabric formed by web laying of composite fibers. The cross-section of the composite fibers is triangular, and each of the three corners of the triangle has an inwardly recessed groove 1. The inwardly recessed groove 1 contains cooling microcapsules, and the content of cooling microcapsules in the inwardly recessed groove 1 is 80%. The composite fibers are formed by combining a first melt and a second melt in a parallel manner during extrusion. The coating amount of the cooling microcapsules is 3 g / m². 2 .

[0042] The radius of the inward groove is approximately 2 μm; the cooling microcapsule comprises a core material and a wall material, wherein the core material is menthol and the wall material is chitosan; the particle size of the cooling microcapsule is 1 μm; and the basis weight of the spunbond nonwoven fabric is 6 g / m². 2 The fineness of the composite fiber is 0.8 dtex; the first melt is polypropylene, and the second melt is polyethylene.

[0043] refer to Figure 2 A panty-style sanitary napkin includes a menstrual panty body 2, a waistband 3 and a leak-proof side panel 4 disposed on the menstrual panty body 2, wherein the waistband 3 and the leak-proof side panel 4 are made of the breathable and cool spunbond nonwoven fabric.

[0044] The air permeability of the waist section is not less than 1300mm / s.

[0045] refer to Figure 3 The leak-proof partition 4 is a double-layer T-shaped leak-proof partition, which is folded in a T-shape with a folding height of 3cm; the folded part of the leak-proof partition 4 is covered with elastic PU foam material 5, and the elastic PU foam material 5 has an elongation ratio of 1.5 times.

[0046] The above-described method for preparing a breathable and cooling spunbond nonwoven fabric includes the following steps:

[0047] S1. Raw material preparation and melting: Polypropylene and polyethylene are fed into different screw extruders for melting, with the screw speed controlled at 200 r / min, to obtain the first melt and the second melt respectively;

[0048] S2, Composite spinning: The first melt and the second melt obtained in step S1 are combined and spun in parallel through a composite spinneret with triangular spinneret holes in a 1:1 ratio. The internal flow channel of the composite spinneret allows the first melt and the second melt to combine in parallel during the extrusion process to form a composite fiber with a triangular cross section and inward grooves at all three corners of the triangle.

[0049] S3. Stretching and Cooling: The composite fibers extruded from the composite spinneret are stretched and refined under the action of high-speed airflow, and simultaneously cooled and shaped rapidly by side-blown cold air; the wind speed of the high-speed airflow is 50m / s, and the temperature of the side-blown cold air is 15℃; the high-speed airflow refines the fibers, causing the polypropylene and polyethylene components to undergo different degrees of deformation during the stretching process due to the difference in stress, further enhancing the crimping effect.

[0050] S4. Web Formation and Reinforcement: The cooled and shaped composite fibers are evenly laid on a web forming curtain under the guidance of airflow to form a fiber web. The fiber web is then sent to a hot rolling mill for hot rolling reinforcement to obtain a preliminary nonwoven fabric. The temperature of the hot rolling reinforcement is 120℃ and the pressure is 15kN / m. The low melting point components on the surface of the fiber web partially melt, causing the fibers to stick together and forming a nonwoven fabric with certain strength and stability.

[0051] S5. Microcapsule coating: Immerse a rubber coating roller with a textured surface into a cooling microcapsule finishing liquid, and coat the cooling microcapsule finishing liquid onto the surface of the initial nonwoven fabric by roller coating. The rubber coating roller is equipped with an ultrasonic vibration device, and low-frequency ultrasonic vibration is applied during the coating process to make the cooling microcapsule finishing liquid more easily overcome surface tension and enter the inward groove.

[0052] S6. Drying treatment: The microcapsule-coated primary nonwoven fabric is placed in a hot air circulating dryer and dried to obtain a breathable and cool spunbond nonwoven fabric.

[0053] The preparation process of the cooling microcapsule finishing solution is as follows:

[0054] I. Core Material Treatment: Menthol is used as the core material. It is placed in a vacuum drying oven and dried at 45°C for 2 hours to remove moisture and volatile impurities, thereby improving the purity and stability of the core material. The dried menthol extract is filtered through a filter membrane to further remove impurities and obtain the core material solution.

[0055] II. Preparation of wall material solution: Chitosan was selected as the wall material. Chitosan was added to a 1% acetic acid solution and stirred until completely dissolved to prepare a 2% chitosan solution. During stirring, the solution was heated to 40°C to accelerate the dissolution rate. Then, Tween 80 emulsifier was added to the chitosan solution at a concentration of 1% of the wall material mass. The solution was stirred for another 30 minutes to ensure that the emulsifier was evenly dispersed in the wall material solution, thus obtaining the wall material solution.

[0056] III. Emulsification and Dispersion: The core material solution obtained in step I is slowly added to the wall material solution obtained in step II. The mass ratio of core material to wall material is controlled at 1:2 to obtain a mixed solution. Then, the mixed solution is placed in a high-speed shear emulsifier and emulsified for 15 minutes at a speed of 3000 r / min, so that the core material is uniformly wrapped in the droplets formed by the wall material to form a stable O / W type emulsion.

[0057] IV. Curing and Molding: Add glutaraldehyde solution as a crosslinking agent to the O / W type emulsion obtained in step III. The amount of crosslinking agent added is 5% of the wall material mass. React for 1 hour under a stirring speed of 800 r / min to allow the wall material to undergo a crosslinking reaction and form a microcapsule shell with certain strength and stability. After the reaction is completed, let the solution stand and cool to room temperature to obtain a cool microcapsule suspension.

[0058] V. Separation and Drying: The cooling microcapsule suspension was centrifuged at 3000 r / min for 10 minutes to remove the supernatant and obtain microcapsule precipitate. The microcapsule precipitate was washed three times with deionized water to remove residual crosslinking agent and other impurities. The washed microcapsule precipitate was placed in a freeze dryer and dried at -40°C and 10 Pa vacuum for 12 hours to obtain dried cooling microcapsule powder.

[0059] VI. Preparation of Cooling Microcapsule Finishing Solution: The dried cooling microcapsule powder was dispersed in water, a dispersant and a thickener were added, and the mixture was stirred until homogeneous. The viscosity of the finishing solution was controlled at 300 mPa·s to obtain the cooling microcapsule finishing solution. The dispersant was sodium polyacrylate, and the amount added was 0.5% of the mass of the cooling microcapsule powder. The thickener was hydroxyethyl cellulose, and the amount added was 0.1% of the mass of water.

[0060] Example 2

[0061] The difference from Example 1 is that the coating amount of the cooling microcapsules is 3g / m³. 2 The radius of the inward groove is approximately 5 μm; the particle size of the cooling microcapsules is 2 μm; the basis weight of the spunbond nonwoven fabric is 8 g / m². 2 The fineness of the composite fiber is 1.0 dtex. Other technical solutions are the same as in Example 1.

[0062] Example 3

[0063] The difference from Example 1 is that the coating amount of the cooling microcapsules is 3.5 g / m³. 2 The radius of the inward groove is approximately 8 μm; the particle size of the cooling microcapsules is 5 μm; the basis weight of the spunbond nonwoven fabric is 10 g / m². 2 The composite fiber has a fineness of 1.5 dtex. Other technical solutions are the same as in Example 1.

[0064] Example 4

[0065] The difference from Example 1 is that the coating amount of the cooling microcapsules is 4 g / m³. 2 The radius of the inward groove is approximately 10 μm; the particle size of the cooling microcapsules is 8 μm; the basis weight of the spunbond nonwoven fabric is 12 g / m². 2 The composite fiber has a fineness of 1.5 dtex. Other technical solutions are the same as in Example 1.

[0066] Example 5

[0067] The difference from Example 1 is that the coating amount of the cooling microcapsules is 5g / m³. 2 The radius of the inward groove is approximately 10 μm; the particle size of the cooling microcapsules is 10 μm; the basis weight of the spunbond nonwoven fabric is 15 g / m². 2 The fineness of the composite fiber is 2 dtex. Other technical solutions are the same as in Example 1.

[0068] Comparative Example 1

[0069] The difference from Example 1 is that the waistband area of ​​the panty-style sanitary napkin uses commercially available ordinary SSS nonwoven fabric. Other technical solutions are the same as in Example 1.

[0070] The breathable and cooling spunbond nonwoven fabrics prepared in Examples 1 to 5 were compared with the ordinary SSS nonwoven fabric of Comparative Example 1 in terms of breathability and q. max Performance testing results are shown in Table 1.

[0071] Table 1

[0072]

[0073] The panty-style sanitary napkins prepared in Examples 1 to 5 were compared with the ordinary panty-style sanitary napkins in Comparative Example 1 in terms of waistband breathability and q. max Performance testing results are shown in Table 2.

[0074] Table 2

[0075]

[0076] The air permeability test instrument used is the YG461G fully automatic air permeability meter.

[0077] The test results in Tables 1 and 2 show that the breathable and cool spunbond nonwoven fabric prepared by this technical solution increases the gaps between fibers due to its unique triangular cross-section structure, improving its fluffiness and crimp, and thus improving its air permeability compared to round fibers.

[0078] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A breathable and cooling spunbond nonwoven fabric, characterized in that, The product includes a substrate and cooling microcapsules coated on the substrate; the substrate is a spunbond nonwoven fabric formed by web laying of composite fibers, the cross-section of the composite fibers is triangular, and each of the three corners of the triangle has an inward groove, the interior of which contains cooling microcapsules; the composite fibers are formed by combining a first melt and a second melt in a parallel manner during extrusion; the coating amount of the cooling microcapsules is 3-5 g / m². 2 The air permeability of the spunbond nonwoven fabric is ≥4000mm / s.

2. The breathable and cooling spunbond nonwoven fabric according to claim 1, characterized in that, The radius of the inward groove is approximately 2-15 μm.

3. The breathable and cooling spunbond nonwoven fabric according to claim 1, characterized in that, The cooling microcapsule comprises a core material and a wall material, wherein the core material is menthol and the wall material is chitosan; the particle size of the cooling microcapsule is 1-10 μm.

4. The breathable and cooling spunbond nonwoven fabric according to claim 1, characterized in that, The basis weight of the spunbond nonwoven fabric is 6-15 g / m². 2 .

5. The breathable and cooling spunbond nonwoven fabric according to claim 1, characterized in that, The fineness of the composite fiber is 0.8-2.0 dtex.

6. The breathable and cooling spunbond nonwoven fabric according to claim 1, characterized in that, The first melt is polypropylene, and the second melt is polyethylene.

7. A panty-style sanitary napkin, comprising a menstrual panty body, a waistband disposed on the menstrual panty body, and leak-proof side panels, characterized in that, At least a portion of the waistband and / or the leak-proof side panel is made of a breathable and cool spunbond nonwoven fabric as described in any one of claims 1 to 6.

8. A pant-style sanitary napkin according to claim 7, characterized in that, The air permeability of the waist section is not less than 1300mm / s.

9. A pant-style sanitary napkin according to claim 7, characterized in that, The leak-proof partition is a double-layer T-shaped leak-proof partition, which is folded in a T-shape with a folding height of 3-5cm; the folded part of the leak-proof partition is covered with elastic PU foam material, and the stretch ratio of the elastic PU foam material is 1.5-2.5 times.

10. The method for preparing a breathable and cooling spunbond nonwoven fabric according to claim 1, characterized in that, Includes the following steps: S1. Raw material preparation and melting: Polypropylene and polyethylene are fed into different screw extruders for melting to obtain the first melt and the second melt, respectively; S2, Composite spinning: The first melt and the second melt obtained in step S1 are combined and spun in parallel through a composite spinneret with triangular spinneret holes in a 1:1 ratio. The internal flow channel of the composite spinneret allows the first melt and the second melt to combine in parallel during the extrusion process, forming a composite fiber with a triangular cross section and inward grooves at all three corners of the triangle. S3, Stretching and Cooling: The composite fibers extruded from the composite spinneret are stretched and refined under the action of high-speed airflow, and at the same time, they are rapidly cooled and shaped by side-blown cold air. S4. Web Forming and Reinforcement: The cooled and shaped composite fibers are evenly laid on a web forming curtain under the guidance of airflow to form a fiber web. The fiber web is then sent to a hot rolling mill for hot rolling reinforcement to obtain the initial nonwoven fabric. S5. Microcapsule coating: Immerse a rubber coating roller with a textured surface into a cooling microcapsule finishing liquid, and coat the cooling microcapsule finishing liquid onto the surface of the initial nonwoven fabric by roller coating. The rubber coating roller is equipped with an ultrasonic vibration device, and low-frequency ultrasonic vibration is applied during the coating process to make the cooling microcapsule finishing liquid more easily overcome surface tension and enter the inward groove. S6. Drying treatment: The microcapsule-coated primary nonwoven fabric is placed in a hot air circulating dryer and dried to obtain a breathable and cool spunbond nonwoven fabric.

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