A method for producing a nonwoven fabric

Abstract

This invention discloses a method for preparing a nonwoven fabric. The nonwoven fabric is reinforced with a double-layer fiber web. The upper fiber web is composed of a uniformly mixed and combed mixture of two types of fine fibers: a first fine denier fiber and a second fine denier fiber. The first fine denier fiber is 0.6–1.0D ES fiber. The surface of the first fine denier fiber undergoes a first vapor deposition / magnetron sputtering treatment of hydrophobic zinc oxide to form a first layer of zinc oxide with a particle size of 10–100 nm. The surface of the first fine denier fiber undergoes a second vapor deposition / magnetron sputtering treatment of hydrophobic zinc oxide to form a second layer of zinc oxide with a particle size of 2–30 nm. This constructs a micro-protruding zinc oxide structure on the surface of the first fine denier fiber, achieving superhydrophobicity of the fiber surface. In this invention, the ES fiber achieves superhydrophobicity and antibacterial properties by constructing a micro-protruding surface structure through a double-layer ZnO layer.

Description

Technical Field

[0001] This invention discloses a method for preparing nonwoven fabric. Background Technology

[0002] With the upgrading of existing consumption concepts and the improvement of living standards, modern consumers are also gradually increasing their pursuit of hygiene products. They not only demand basic performance but also pay attention to product functionality and comfort. There are many types of hygiene products available, with varying structures depending on their functions and performance, such as absorption time, absorption capacity, antibacterial properties, skin care, and the ability to lighten the color of surface fluids. Especially for sanitary napkins used during menstruation, menstrual blood is a mixture of blood, shed uterine lining, cervical mucus, and vaginal secretions. Menstrual blood is dark in color, slightly viscous, and does not easily clot; upon close inspection, small, thin fragments may be visible. Sometimes blood clots or black blood may appear. Currently, hygiene products on the market work by permeating the liquid excretions through a non-woven fabric surface, which is then absorbed and stored by the absorbent layer. However, for highly viscous and easily clumping liquids, such as menstrual blood, poor permeability can cause residue to remain on the surface of the sanitary napkin, resulting in a sticky, uncomfortable feeling and visual discomfort for the user. Furthermore, the slow absorption and surface dampness can cause allergies and other problems, significantly reducing consumer comfort. Summary of the Invention

[0003] To overcome the above-mentioned defects, the purpose of this invention is to provide a novel method for preparing nonwoven fabrics.

[0004] To achieve the above objectives, the present invention provides a method for preparing a nonwoven fabric, wherein the nonwoven fabric is formed by reinforcing a double-layer fiber web; the upper fiber web is composed of a uniformly mixed and combed mixture of two types of fine fibers, namely a first fine denier fiber and a second fine denier fiber, in a ratio of (1-5:1); wherein

[0005] The first fine denier fiber is an ES fiber with a denier of 0.6 to 1.0 D;

[0006] The surface of the first fine denier fiber is subjected to a first hydrophobic zinc oxide vapor deposition / magnetron sputtering treatment to form a first layer of zinc oxide on the surface of the first fine denier fiber, the zinc oxide having a particle size of 10-100 nm;

[0007] The surface of the first fine denier fiber is subjected to a second hydrophobic zinc oxide vapor deposition / magnetron sputtering treatment to form a second zinc oxide layer on the surface of the first zinc oxide layer, the zinc oxide particle size being 2-30 nm;

[0008] A zinc oxide structure with micro-protrusions is constructed on the surface of the first fine denier fiber to achieve superhydrophobicity of the fiber surface.

[0009] To achieve the above objectives, the present invention provides a method for preparing a nonwoven fabric, wherein the nonwoven fabric is formed by reinforcing a double-layer fiber web; the upper fiber web is composed of a uniformly mixed and combed mixture of two types of fine fibers, namely a first fine denier fiber and a second fine denier fiber, in a ratio of 1 to 5:1; wherein,

[0010] A ZnO layer is formed on the surface of first fine denier fibers using ZnO emulsion with a particle size of 10–100 nm.

[0011] In situ growth of ZnO seed layer using zinc acetate solution allows ZnO to grow in a flower-like to rod-like shape, increasing roughness. The resulting fibers, after drying, have a contact angle greater than 150°, thus achieving superhydrophobic fiber surface.

[0012] Furthermore, the second fine denier fiber is an ES fiber containing hydrophilic silica with a denier of 1.0 to 1.5D and a fiber contact angle of 80 to 90°.

[0013] The second fine denier fiber is treated with a weakly uniphilic oil agent to make the fiber contact angle 70-80° in order to achieve liquid penetration;

[0014] After being wetted by the liquid, the uniphilic oil agent leaves the fiber and is carried into the absorbent core along with the liquid. At this time, the fiber contact angle is 80-90°, which can reduce the backflow of liquid. At the same time, after the fiber is wetted, it establishes a capillary channel with the lower fiber web, which can ensure the smooth infiltration of subsequent liquid.

[0015] Furthermore, the lower fiber web is composed of moisture-absorbing fibers and ES fibers;

[0016] Among them, the moisture-absorbing fiber is plant fiber or regenerated cellulose fiber;

[0017] The mass of moisture-absorbing fiber added to the lower fiber web is 0.5-5%; the moisture-absorbing fiber can absorb the moisture stored in the fiber gaps in the upper fiber web, so as to keep the upper fiber web dry.

[0018] The lower ES fiber web is made of multiple highly hydrophilic fibers, which can also transfer excess liquid absorbed by the moisture-absorbing fibers.

[0019] Furthermore, it also includes the step of finishing the nonwoven fabric:

[0020] Skin care lotion is added to nonwoven fabric using a roller coating process;

[0021] Furthermore, the skin care lotion comprises the following raw materials in the following mass fractions: 0.5-5 parts guaiacol, 0.5-5 parts ceramide, 0-20 parts octadecyl fatty alcohol, 0-20 parts palmitole fatty alcohol, 10-25 parts petrolatum, 0.5-5 parts water, and 0.1-2 parts pH buffer system.

[0022] Furthermore, in the roller coating process, the roller is provided with polygonal or circular closed patterns so that the skin care lotion is formed on the nonwoven fabric in the form of closed patterns.

[0023] Furthermore, the skin lotion is prepared according to the following steps:

[0024] Prepare an oil phase solution by mixing 0.5-5 parts of guaiazoline, 0-20 parts of decanoic acid fatty alcohol, 0-20 parts of palmitic acid fatty alcohol, 10-25 parts of petrolatum, 0.5-5 parts of water and 0.5-5 parts of surfactant and stirring for 1-2 hours.

[0025] The emulsion was prepared by adding 0.5 to 5 parts of ceramide dropwise to the oil phase solution while homogenizing with a high-speed disperser. After homogenization for a period of time, a pH buffer system was added dropwise to adjust the pH of the emulsion to 4.5 to 6.5.

[0026] Furthermore, the upper fiber web has fibers smaller than 15µm, and the lower fiber web has fibers smaller than 25µm; the lower surface of the upper and / or lower fiber webs is provided with 5 to 500 fibers with a diameter of 0.001-0.1mm per cm. 2 The glue droplets.

[0027] Furthermore, the adhesive droplets are formed according to the following method:

[0028] A rotary spraying device is used to spray UV-curable adhesive onto the upper fiber mesh and / or the lower surface of the lower fiber mesh to form adhesive droplets;

[0029] The adhesive droplets are cured using a light-curing device; during the curing process, air is blown downwards from above the nonwoven fabric to make the adhesive droplets protrude downwards.

[0030] Images are obtained by photographing the surface of the cured nonwoven fabric using a camera;

[0031] Image preprocessing is performed to accurately identify and measure droplet size;

[0032] Extract the number and diameter of the droplets from the processed image;

[0033] Data on the viscosity of UV-curable adhesives, environmental conditions, characteristics of nonwoven fabric surfaces, and turntable speed were collected to determine their impact on the number and diameter of adhesive droplets.

[0034] The initial training dataset is determined based on the aforementioned effects;

[0035] The initial training dataset is preprocessed to obtain the model training dataset, which includes a training dataset and a test dataset.

[0036] An initial prediction model was constructed based on the Long Short-Term Memory (LSTM) network.

[0037] The initial prediction model was trained and validated using the training and test datasets described above.

[0038] The validated predictive model was used to precisely adjust the rotation speed of the servo motor in the rotary sprayer to control the number and diameter of the droplets.

[0039] In this invention, the upper layer is a mixture of fine denier ES fibers and monohydric fibers. The ES fibers utilize a double-layer ZnO structure to create micro-protrusions on the surface, controlling particle size to increase roughness and blood contact area. Micro-pits (containing air) expand the liquid-air interface, providing surface energy to the blood and achieving superhydrophobicity and self-cleaning properties on the fiber surface. Simultaneously, the nano-zinc oxide exhibits antibacterial properties. The monohydric fibers contain hydrophilic SiO2 and are treated with a monohydric oil agent, establishing capillary channels with the lower fiber web after liquid impregnation, ensuring smooth subsequent liquid penetration. The lower layer is a mixture of moisture-absorbing fibers and multiple hydrophilic fibers. The moisture-absorbing fibers absorb moisture stored in the fiber gaps of the upper fiber web, keeping the upper fiber web dry, while the multiple strong hydrophilic fibers transfer excess liquid absorbed by the moisture-absorbing fibers. Simultaneously, the nonwoven fabric undergoes finishing treatment, utilizing a W / O emulsion system and a closed pattern to block capillary action, effectively preventing liquid backflow and enhancing skin-care functions to reduce allergic reactions. Detailed Implementation

[0040] The embodiments of the present invention will now be described in detail.

[0041] The nonwoven fabric of the present invention is reinforced by a double-layer fiber web; the upper fiber web is composed of a uniformly mixed and combed mixture of fine denier fibers (0.6-1.0D) and 1.0-1.5D fibers in a ratio of 1-5:1; the lower fiber web is composed of moisture-absorbing fibers and ES fibers.

[0042] First, the upper layer of fine denier fibers (0.6–1.0D) is treated with superhydrophobicity:

[0043] The fine denier fibers (0.6–1.0D) are ES fibers. The fiber surface is treated twice with hydrophobic zinc oxide by vapor deposition / magnetron sputtering. The first zinc oxide layer has a particle size of 10–100 nm, and the second layer has a particle size of 2–30 nm. By controlling the different particle sizes of zinc oxide during the treatment process, the roughness is increased, constructing a micro-protrusion structure (lotus leaf effect) on the surface of the fine denier fibers, achieving superhydrophobicity of the fiber surface. Simultaneously, nano-zinc oxide has antibacterial properties. Blood only comes into contact with the micro-protrusions, reducing the surface contact area. Through micro-pits (containing air), the interface between the liquid and air is expanded, and the blood gains a certain surface energy, preventing it from spreading and achieving a self-cleaning effect.

[0044] or

[0045] The fine denier fibers are first placed in a ZnO emulsion (particle size 10-100 nm) using a hydrothermal method to generate ZnO. Then, the fibers are passed through a zinc acetate solution (small particle size) to promote the in-situ growth of ZnO (small particle size) on the ZnO seed layer (large particle size), thereby promoting the growth of ZnO from flower-like to rod-like shapes and increasing roughness. The resulting fibers are dried and have a contact angle greater than 150° and are superhydrophobic.

[0046] 1.0-1.5D fiber: Hydrophilic nano-silica (0.5-15%) is added to PE masterbatch to prepare ES fiber containing hydrophilic silica. The fiber contact angle is 80-90°. The fiber is then treated with a weak oleophilic agent to achieve a contact angle of 70-80°, thus enabling liquid penetration.

[0047] After being wetted by the liquid, the uniphilic oil agent leaves the fiber and is carried into the absorbent core along with the liquid. At this point, the fiber contact angle is 80–90°, which reduces backflow of the liquid. Simultaneously, the wetted fiber establishes a capillary channel with the underlying fiber web, ensuring smooth penetration of subsequent liquids.

[0048] Secondly, in the lower layer of the fiber web, the moisture-absorbing fibers are plant fibers or regenerated cellulose fibers, preferably cotton fibers, viscose fibers, or lyocell fibers. The amount of moisture-absorbing fibers added to the lower layer of the fiber web (0.5-5%) allows the moisture-absorbing fibers to absorb the moisture stored in the fiber gaps of the upper layer of the fiber web, thus keeping the upper layer of the fiber web dry.

[0049] The lower fiber web ES is made of multiple highly hydrophilic fibers, which can also transfer excess liquid absorbed by the moisture-absorbing fibers.

[0050] Further finishing treatment of the nonwoven fabric involves adding skin-care ingredients through a roller coating process, giving the nonwoven fabric functions such as dryness, skin care, and softness, and reducing allergic reactions.

[0051] The above-mentioned skin care lotion contains the following ingredients in the indicated weight percentages: 0.5-5 parts guaiacol, 0.5-5 parts ceramide, 0-20 parts octadecyl fatty alcohol, 0-20 parts palmitole fatty alcohol, 10-25 parts petrolatum, 0.5-5 parts water, and 0.1-2 parts pH buffer system.

[0052] The skincare emulsion is prepared according to the following steps: 0.5-5 parts of guaiacine, 0-20 parts of decanoic acid fatty alcohol, 0-20 parts of palmitic acid fatty alcohol, 10-25 parts of petrolatum, 0.5-5 parts of water, and a certain amount of surfactant are mixed and stirred for 1-2 hours to prepare an oil phase solution. Using a dropwise addition method, 0.5-5 parts of ceramide are added dropwise to the oil phase solution while homogenizing with a high-speed disperser. After homogenization for a period of time, a pH buffer system is added dropwise to adjust the pH of the emulsion to 4.5-6.5, thus obtaining the emulsion.

[0053] The pH buffer system, with a high molecular weight (molecular weight > 1000), prevents skin penetration and utilizes its buffering capacity to adjust the emulsion pH between 4.5 and 6.5. Further, it is a polyglutamic acid / polyglutamate and polyleucine / polyleucine salt compound system.

[0054] Furthermore, the embossing roller in the above-mentioned roller coating process has a closed pattern, such as a quadrilateral, pentagon, hexagon, or a closed irregular pattern. The closed pattern locks in the liquid and blocks capillary action. During use, the pressure promotes the downward penetration of the liquid, achieving skin protection, minimal surface diffusion, and low moisture return.

[0055] Furthermore, the friction migration of skincare ingredients is ≤60%, and even further, it is 30-60%.

[0056] In the above scheme, the upper layer is a mixture of fine denier ES fibers and monohydric fibers. The ES fibers have a surface micro-protrusion structure constructed with double-layer ZnO, controlling the particle size to increase roughness and blood contact area. Micro-pits (containing air) expand the liquid-air interface, allowing the blood to gain surface energy, achieving superhydrophobicity and self-cleaning properties on the fiber surface. Simultaneously, nano-zinc oxide has antibacterial properties. The monohydric fibers contain hydrophilic SiO2 and are treated with a monohydric oil agent, establishing capillary channels with the lower fiber web after liquid wetting, ensuring smooth subsequent liquid penetration. The lower layer is a mixture of moisture-absorbing fibers and multiple hydrophilic fibers. The moisture-absorbing fibers absorb moisture stored in the fiber gaps of the upper fiber web, keeping the upper fiber web dry, while the multiple hydrophilic fibers transfer excess liquid absorbed by the moisture-absorbing fibers. Simultaneously, the nonwoven fabric undergoes finishing, utilizing a W / O emulsion system and a closed pattern to block capillary action, effectively preventing liquid backflow, while also increasing skin-care functions and reducing allergic reactions.

[0057] Experimental data

[0058] Nonwoven fabrics were tested according to GB / T 24218.13-2010 Textiles - Nonwovens - Test Methods - Part 13: Determination of Liquid Penetration Time, GB / T 24218.14-2010 Textiles - Nonwovens - Test Methods - Part 14: Determination of Reabsorption of Covering Materials, and T / CTAPI002-2022 Craftsmanship Products - Household Paper, to characterize their liquid penetration time, reabsorption, and softness.

[0059] I. Using 2.5D ES fiber as the lower layer fiber web, the influence of different upper layer fibers on the properties of nonwoven fabrics was verified.

[0060]

[0061] Note: TSA tests softness, where TS7 represents true softness, which is mainly affected by the fiber. The smaller the peak value, the better the softness.

[0062] The finer the fibers in the upper fiber web, the lower the TS7 value, and the better the actual softness. However, the liquid penetration time and moisture return are poor. By using a suitable combination of fiber fineness, the softness and absorbency of the nonwoven fabric can be balanced.

[0063] After 0.8D fibers are treated with ZnO supercombing water, water does not adhere to their surface, which can significantly reduce the amount of moisture returning to the surface.

[0064] By combining hydrophilic nano-silica of 1.2D fibers with a single-affinity oil agent treatment, a permanent weak hydrophilicity is achieved on the 1.2D surface. At the same time, the initial hydrophilic effect of the single-affinity oil agent enables the smooth penetration of liquid. After the fiber is wetted, a capillary channel is established with the underlying fiber network, which can ensure the smooth penetration of subsequent liquids and reduce the amount of back-wetting.

[0065] II. The upper fiber web was treated with 80% 0.8D ZnO + 20% 1.2D hydrophilic nano-silica and treated with a single-oil-loving agent to verify the effect of different lower fibers on the properties of nonwoven fabrics.

[0066]

[0067]

[0068] Adding viscose fibers to the lower fiber web facilitates rapid liquid penetration. When the amount added is small, it can absorb moisture stored in the fiber gaps of the upper fiber web and transfer it to the absorbent core through the lower ES fibers, thus reducing moisture return. However, adding too much viscose fiber will cause liquid to remain in the absorbent fibers and not be effectively transferred, resulting in high moisture return.

[0069] Nonwoven fabric finishing

[0070] Baby diapers were made from nonwoven fabrics with different coating patterns, and their permeability was tested according to GB / T 28004.1-2021.

[0071]

[0072] After the surface of nonwoven fabric is coated with emulsion, the absorption rate slows down and the amount of rewetting decreases. This is because the absorption area is smaller after coating, which leads to a slower absorption rate. However, at the same time, there is a water-repellent area, which also reduces the amount of rewetting.

[0073] Compared to non-closed patterns, closed patterns can completely block capillary action, thereby reducing diffusion on the surface and significantly reducing the amount of re-permeation.

[0074] Although the closed-pattern coating may affect the absorption rate, it is still much faster than the national standard requirements, and there is no risk of leakage.

[0075] To achieve good skincare results, it is desirable for more skincare ingredients to migrate to the skin's surface. However, while migrating to the skin's surface, there is also a risk of migrating downwards, which could affect the performance of hygiene products.

[0076] Coating agent migration test method:

[0077] Weigh the acrylic panel and record the weight as M1. Lay the nonwoven fabric coated with emulsion (the emulsion coating mass is M0) flat on the acrylic panel.

[0078] Place a 5kg pressure block with a size of 60mm*100mm on the nonwoven fabric, with the non-emulsion coated surface in contact with the pressure block;

[0079] The nonwoven fabric is pulled back and forth three times at a constant speed of 500 mm / min, with a pulling amplitude of 100 mm.

[0080] Remove the pressure block and non-woven fabric, and weigh the acrylic plate (M2).

[0081] Calculate the migration amount M% = (M2 - M1) / M0 * 100%

[0082] The migration rate of the skincare system is controlled by altering its stiffness. Nonwoven fabrics are then used to make diapers, and their absorption rate and rewetting are tested according to GB / T28004.1-2021 Baby Diapers.

[0083] Migration First absorption rate / s Second absorption rate / s Reabsorption rate / g 20％ 10 17 2.5 30％ 10 19 1.8 40％ 12 25 1.3 50％ 14 28 1.2 60％ 18 32 1.9 70％ 38 67 6.7 80％ 67 98 7.2

[0084] As a further improvement of the present invention, 5-500 particles with a diameter of 0.001-0.1 mm are provided on the lower surface of the upper fiber web and / or the lower fiber web. 2 The adhesive droplets are light-curing adhesives; light-curing adhesives, also known as UV adhesives or shadowless adhesives, are adhesives that must be cured by ultraviolet light.

[0085] Its preparation process includes the following steps:

[0086] UV-curable adhesive is applied to the upper and lower surfaces of the fiber mesh using methods such as spraying or roller coating.

[0087] The adhesive droplets are cured using a photocuring device. Preferably, during the photocuring process, air is blown upwards from the nonwoven fabric to cause the adhesive droplets to form a spindle structure.

[0088] Under blowing conditions, most UV-cured adhesive will drip and adhere to the entanglement of fibers. After curing, adhesive droplets will form at the fiber entanglement. When the liquid comes into contact with the adhesive droplets, the Laplace pressure gradient caused by the change in curvature can accelerate the liquid penetration.

[0089] The present invention has been described in detail above, but it is not limited to the embodiments described above. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the invention. Many other changes and modifications made without departing from the concept and scope of the invention should be considered within the scope of protection of the present invention.

[0090] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0091] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing a nonwoven fabric, characterized in that, The nonwoven fabric is reinforced with a double-layer fiber web, the upper fiber web being composed of a uniformly mixed and combed mixture of two types of finer fibers, namely, a first fine denier fiber and a second fine denier fiber; wherein, The first fine denier fiber is an ES fiber with a denier of 0.6~1.0D; The surface of the first fine denier fiber is subjected to a first hydrophobic zinc oxide vapor deposition or magnetron sputtering treatment to form a first layer of zinc oxide on the surface of the first fine denier fiber, wherein the particle size of the zinc oxide is 10~100nm. The surface of the first fine denier fiber is subjected to a second hydrophobic zinc oxide vapor deposition or magnetron sputtering treatment to form a second layer of zinc oxide on the surface of the first layer of zinc oxide, wherein the particle size of the zinc oxide is 2~30nm. A zinc oxide structure with micro-protrusions is constructed on the surface of the first fine denier fiber to achieve superhydrophobicity of the fiber surface; The second fine denier fiber is an ES fiber containing hydrophilic silica with a denier of 1.0~1.5D and a fiber contact angle of 80~90°; The second fine denier fiber is treated with a weakly uniphilic oil agent to make the fiber contact angle 70~80° so as to achieve liquid penetration; After being wetted by the liquid, the uniphilic oil agent leaves the fiber and is carried into the absorbent core along with the liquid. At this time, the fiber contact angle is 80~90°, which can reduce the backflow of liquid. At the same time, after the fiber is wetted, it establishes a capillary channel with the lower fiber web, which can ensure the smooth infiltration of subsequent liquid.

2. A method for preparing a nonwoven fabric, characterized in that, The nonwoven fabric is reinforced with a double-layer fiber web, the upper fiber web being composed of a uniformly mixed and combed mixture of two types of finer fibers, a first fine denier and a second fine denier; wherein, A ZnO seed layer is formed on the surface of first-denier fibers using a ZnO emulsion with a particle size of 10~100nm; In-situ growth of ZnO seed layer using zinc acetate solution allows ZnO to grow in a flower-like to rod-like shape, increasing roughness. The resulting fibers, after drying, have a contact angle greater than 150°, thus achieving superhydrophobic fiber surface. The second fine denier fiber is an ES fiber containing hydrophilic silica with a denier of 1.0~1.5D and a fiber contact angle of 80~90°; The second fine denier fiber is treated with a weakly uniphilic oil agent to make the fiber contact angle 70~80° so as to achieve liquid penetration; After being wetted by the liquid, the uniphilic oil agent leaves the fiber and is carried into the absorbent core along with the liquid. At this time, the fiber contact angle is 80~90°, which can reduce the backflow of liquid. At the same time, after the fiber is wetted, it establishes a capillary channel with the lower fiber web, which can ensure the smooth infiltration of subsequent liquid.

3. The method for preparing the nonwoven fabric as described in claim 1 or 2, characterized in that, The lower fiber web is composed of moisture-absorbing fibers and ES fibers; Among them, the moisture-absorbing fiber is plant fiber or regenerated cellulose fiber; The amount of moisture-absorbing fiber added to the lower fiber web is 0.5-5% by mass. The moisture-absorbing fiber can absorb the moisture stored in the fiber gaps in the upper fiber web, so as to keep the upper fiber web dry. The lower ES fiber is a highly hydrophilic fiber that can also transfer excess liquid absorbed by the moisture-absorbing fiber.

4. The method for preparing the nonwoven fabric as described in claim 1 or 2, characterized in that, It also includes the step of finishing the nonwoven fabric: Skin care lotion is applied to nonwoven fabric using a roller coating process.

5. The method for preparing the nonwoven fabric as described in claim 4, characterized in that, The skin care lotion contains the following ingredients in the indicated mass fractions: 0.5-5 parts guaiacol, 0.5-5 parts ceramide, 0-20 parts decanoic acid fatty alcohol, 0-20 parts palmitole fatty alcohol, 10-25 parts petrolatum, 0.5-5 parts water, and 0.1-2 parts pH buffer system.

6. The method for preparing the nonwoven fabric as described in claim 4, characterized in that, In the roller coating process, the roller is provided with polygonal or circular closed patterns so that the closed pattern of the skin lotion is formed on the nonwoven fabric.

7. The method for preparing the nonwoven fabric as described in claim 1, characterized in that, The upper fiber web and / or the lower surface of the lower fiber web are provided with 5 to 500 dots per cm, each with a diameter of 0.001-0.1 mm. 2 The glue droplets.

8. The method for preparing the nonwoven fabric as described in claim 7, characterized in that, The aforementioned droplets are formed according to the following method: A rotary spraying device is used to spray UV-curable adhesive onto the upper fiber mesh and / or the lower surface of the lower fiber mesh to form adhesive droplets; The adhesive droplets are cured using a photocuring device; During the curing process, air is blown downwards from above the nonwoven fabric to cause the adhesive droplets to protrude downwards; Images are obtained by photographing the surface of the cured nonwoven fabric using a camera; Image preprocessing is performed to accurately identify and measure droplet size; Extract the number and diameter of the droplets from the processed image; Data on the viscosity of UV-curable adhesives, environmental conditions, characteristics of nonwoven fabric surfaces, and turntable speed were collected to determine their impact on the number and diameter of adhesive droplets. The initial training dataset is determined based on the aforementioned effects; The initial training dataset is preprocessed to obtain the model training dataset, which includes a training dataset and a test dataset. An initial prediction model was constructed based on the Long Short-Term Memory (LSTM) network. The initial prediction model was trained and validated using the training and test datasets described above. The validated predictive model was used to precisely adjust the rotation speed of the servo motor in the rotary sprayer to control the number and diameter of the droplets.

Images