Plant fiber needle-punched non-woven fabric suitable for female hygienic products

Abstract

The invention discloses a plant fiber needle-punched non-woven fabric suitable for female hygienic products, which comprises at least one of a modified alginate fiber non-woven fabric, a modified lyocell non-woven fabric and a calcium alginate non-woven fabric, and the three non-woven fabrics all utilize the high-power water absorption and hydrogel functions of the non-woven fabrics. The material is used for preparing a sanitary napkin core body or a tampon or tampon wrapping cloth, and in the using process of the prepared sanitary napkin, the material is gelling when meeting water, so that the effect of keeping the surface of the sanitary napkin relatively dry and comfortable and preventing side leakage is achieved; calcium ions in alginate fibers in the modified alginate fiber non-woven fabric and the calcium alginate non-woven fabric and sodium ions in menstrual blood are subjected to a cross-linking reaction, a large amount of moisture can be absorbed, a gel feeling is generated, a user can conveniently take out the sanitary towel due to the excellent satininess, friction and dryness during taking out are greatly reduced, and the sanitary towel is convenient to use. The three non-woven fabrics are all made of biomass materials, so that the non-woven fabrics are green, environment-friendly and biodegradable.

Description

Technical Field

[0001] This invention relates to the field of feminine hygiene products technology, and more particularly to a plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products. Background Technology

[0002] Tampons and sanitary napkins are both menstrual products for women. A tampon, also known as a sanitary plug, is a cylindrical cotton tampon, primarily made of cotton, synthetic fibers, or a blend of both. They come in sizes ranging from 1 cm to 1.9 cm in diameter and have a string (pull cord) at the end. During menstruation, it is inserted into the vagina to absorb menstrual blood. The roundness of the tip of a tampon varies between brands, allowing users to choose according to their preferences. Tampons often have straight or diagonal indentations on the tampon itself to increase its absorbency and allow it to conform to the vaginal wall when it swells to absorb menstrual blood. Applicator-type tampons have a paper or plastic applicator for easy insertion. The applicator consists of an outer tube and an inner tube. The outer tube has a smooth surface and a rounded tip for easy insertion. The tip of the outer tube has a petal-shaped opening. The inner tube pushes the tampon out of the petal-shaped opening of the outer tube in a piston-like motion.

[0003] Tampons primarily consist of an absorbent core and a wrapping fabric. The absorbent core is made of organic degreased cotton fibers and viscose fibers, while the wrapping fabric is generally made of organic cotton needle-punched fabric, spunbond nonwoven fabric, or hot-air nonwoven fabric. Sanitary towels are made of a polymer and polymer composite paper formed from cotton, nonwoven fabric, pulp, or a combination of these materials. They are mainly used as hygiene products for women during menstruation. They consist of a top layer, an absorbent core, and a bottom layer. Currently, the superabsorbent material used in sanitary towels and tampons is primarily SAP (superabsorbent polymer), which is non-biodegradable. Tampons also have issues such as slow absorption and a feeling of friction and dryness upon removal. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art.

[0005] This application provides a plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products, characterized in that the plant fiber needle-punched nonwoven fabric includes at least one of modified seaweed fiber nonwoven fabric, modified lyocell nonwoven fabric and calcium alginate nonwoven fabric, and is used as a sanitary napkin core or tampons or tampons wrapping fabric.

[0006] Preferably, the raw material components of the modified seaweed fiber nonwoven fabric are seaweed fiber, lyocell fiber / viscose fiber, and modified lyocell fiber, with a mass ratio of 20%–80%; 20%–80%; 20%–80%, and only the seaweed fiber in the components is modified, while the lyocell fiber / viscose fiber and modified lyocell fiber are unmodified basic raw materials.

[0007] This application also discloses a modified preparation process for plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products, characterized in that the preparation process of the modified seaweed fiber nonwoven fabric and the modified lyocell nonwoven fabric includes alkalization, etherification, neutralization and post-treatment steps.

[0008] The preferred method is as follows: Alkalization: After the pretreatment is completed, the alkaline solution is poured into the reaction vessel for alkalization treatment. The alkaline solution is composed of alkali, water and auxiliary agent. The alkali is sodium hydroxide, sodium carbonate and sodium bicarbonate, and the auxiliary agent is sodium dodecylbenzenesulfonate (SDS). Etherification: After alkalization, etherification solution is added to the reaction vessel and stirred. The solute in the etherification solution is composed of one or more of chloroacetic acid and sodium chloroacetate. Then, ethanol is added. Neutralization: After extrusion, the modified composite fibers are neutralized and eluted with an eluent composed of hydrochloric acid, ethanol and water. Post-processing: After the modified composite fibers are spun dry, they are placed in a mixing container. Collagen impregnation solution is sprayed evenly into the modified composite fibers through a spraying device and stirred. The spraying device is driven by compressed air to spray the solution evenly onto the fiber surface in the form of aerosol, so that the collagen impregnation solution can fully impregnate and load into the gaps between the fiber bundles.

[0009] Preferably, the pretreatment is carried out in an organic solvent using cellulose fibers as raw materials, so that the initial structure of the cellulose fibers can be preserved, and the collagen impregnation solution is composed of ethanol, water, collagen, humectant and surfactant.

[0010] Preferably, the collagen infusion has a collagen content of 4-30%, the collagen is derived from animal skin, bone or connective tissue, and the humectant is 0.4-1.5%, composed of one or more of ethylene glycol, propylene glycol and glycerol.

[0011] Preferably, the surfactant is 0.05-1.0% and is composed of one or more of Tween, Span, alkylolamide (FFA), fatty alcohol polyoxyethylene ether (AE), and lecithin.

[0012] This application also discloses a method for preparing tampons made of plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products, characterized in that... S1 Preparation of strip fiber layer: Organic degreased cotton is combed and laid into a single layer of fiber, and then the single layer of fiber is stacked into 4-16 layers of fiber web, pressed, shaped and cut to obtain strip fiber layer; S2 Wrapped Strip Fiber Layer: A strip fiber layer is wrapped with plant fiber needle-punched nonwoven fabric; S3 Preparation of Tampons: Fix the cotton thread in the center of the strip fiber layer, with the end of the cotton thread exposed 10-20cm outside the strip fiber layer. Then, roll the strip fiber layer to form a cylindrical absorbent body. After pressing and shaping in a forming device, microwave heating treatment is performed to obtain the tampon body. The tampon body is inserted into the applicator connected to the push rod to make a tampon.

[0013] Preferably, before step S2, drainage holes are first set: the plant fiber needle-punched nonwoven fabric is cut into strips, and several indentations are set on one side of the center line of the strip plant fiber needle-punched nonwoven fabric. Each indentation is provided with a drainage hole. The indentations are straight or curved. The drainage holes are straight drainage holes. The drainage holes are circular with a diameter of 0.5-1.5 mm. The number of drainage holes is set to 2-8, and the spacing between the drainage holes is set to 3-5 mm. Then, sanitary tampons are prepared.

[0014] This application also discloses a method for preparing a sanitary napkin using plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products, characterized by comprising the following steps: Preparation of plant fiber needle-punched nonwoven fabric: Single-layer mesh fibers are stacked, with each pair of fibers stacked perpendicularly to each other. The number of stacked layers is 4-16, and finally a multi-layer fiber web is formed. Then, the plant fiber needle-punched nonwoven fabric is obtained through a needle-punching process, which serves as the absorbent core layer. Preparation of sanitary napkins: 2-8 layers of plant fiber needle-punched nonwoven fabric are covered on the absorbent core layer, and then the sanitary napkins are made through the following processes: groove forming, bottom film covering, back wing release paper pasting, perimeter sealing and shaping, external cutting and shaping, wrapping film covering and quick-applying, horizontal sealing and cutting.

[0015] The above-mentioned plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products includes at least one of modified seaweed fiber nonwoven fabric, modified lyocell nonwoven fabric, and calcium alginate nonwoven fabric. All three types of nonwoven fabric utilize their high absorbency and hydrogel properties to prepare sanitary napkin cores, tampons, or tampon wraps. During use, the material gels upon contact with water, keeping the surface of the sanitary napkin relatively dry and preventing side leakage. Modified seaweed fiber nonwoven fabric and calcium alginate nonwoven fabric have greater advantages as tampon wraps. The calcium ions in seaweed fiber react with the sodium ions in menstrual blood, resulting in a large amount of moisture absorption and a gel-like feel. Its excellent slipperiness allows users to easily remove the tampons, greatly reducing friction and dryness during removal. This product significantly improves the user's experience. Furthermore, alginate itself has antibacterial and anti-inflammatory properties, eliminating or reducing odor, making it more feminine-friendly. All three types of nonwoven fabrics mentioned above are biocompatible and human-friendly. Because they are made from biomass materials, they are green, environmentally friendly, and biodegradable.

[0016] The beneficial effects of the present invention will be described in detail in the embodiments, thereby making the beneficial effects more obvious. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the specific structure of an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] The embodiments of this application will be described in detail below through specific examples, accompanying drawings, and application scenarios.

[0021] Example 1: like Figure 1 As shown, this application provides a plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products. In a specific embodiment of the present invention, the plant fiber needle-punched nonwoven fabric includes at least one of modified seaweed fiber nonwoven fabric, modified lyocell nonwoven fabric, and calcium alginate nonwoven fabric, and is used as a sanitary napkin core or tampons or tampons wrapping fabric.

[0022] As the absorbent core in sanitary napkins, it absorbs a large amount of moisture and forms a gel, achieving a relatively dry surface and preventing side leakage. In tampons, it provides a smooth feel, making it easy for users to remove and reducing friction and dryness, thus improving user comfort. The plant fiber needle-punched nonwoven fabric used in both the absorbent core of the sanitary napkin and the wrapping fabric of the tampons is a highly absorbent gel-type biomass fiber. Alginates in this fiber have antibacterial and anti-inflammatory properties, eliminating or reducing odor and being gentle on women. All materials are biodegradable, offering advantages such as being green, environmentally friendly, and suitable for various applications.

[0023] When used in the absorbent core of sanitary napkins, any one of the three types of nonwoven fabrics mentioned above is used in the absorbent core of the sanitary napkin or as a wrapping fabric for sanitary tampons. Plant fiber needle-punched nonwoven fabric has a high absorbency and hydrogel effect upon contact with water.

[0024] Modified seaweed fiber nonwoven fabric is a nonwoven fabric made by blending seaweed fiber and lyocell in different proportions. Only the seaweed fiber in the nonwoven fabric is modified, and the modified seaweed fiber has a hydrogel effect.

[0025] Calcium alginate nonwoven fabric undergoes a cross-linking reaction between calcium ions on its surface and sodium ions in menstrual blood, resulting in the absorption of large amounts of moisture and the formation of a gel.

[0026] Modified Lyocell nonwoven fabric is a modified nonwoven fabric made of 100% Lyocell. After modification, the Lyocell nonwoven fabric has a hydrogel effect.

[0027] The above three types of nonwoven fabrics can be used as the absorbent core of sanitary napkins or as the wrapping fabric for tampons, or directly rolled into tampons for vaginal use. All three types of nonwoven fabrics can absorb a large amount of moisture and produce a gel. In the modified seaweed fiber nonwoven fabric, the raw material ratio of seaweed fiber to lyocell fiber is 20%–80% seaweed fiber, 20%–80% lyocell fiber or viscose fiber, and 20%–80% modified lyocell fiber (too high a ratio affects breathability, too low a ratio reduces the gelling effect). The modified seaweed fiber nonwoven fabric is rich in sodium alginate, which absorbs a large amount of moisture from menstrual blood and forms a gel, providing excellent slipperiness. Calcium alginate nonwoven fabric, rich in calcium ions, reacts with sodium ions in menstrual blood to form a cross-linking reaction, absorbing a large amount of moisture and producing a gel, also providing excellent slipperiness, reducing friction and dryness when removed. Furthermore, calcium alginate itself has antibacterial properties, eliminating or reducing odor, providing consumers with a better living experience.

[0028] Example 2: In a specific embodiment of the present invention, hydrogel-type nonwoven fabric or calcium alginate nonwoven fabric is used as the wrapping fabric of the tampons, or the tampons are directly rolled into a cylindrical structure before preparation. The specific preparation method of the tampons is as follows: S1 Preparation of strip fiber layer: Organic degreased cotton is combed and laid into a single layer of fiber, and then the single layer of fiber is stacked into 4-16 layers of fiber web, pressed, shaped and cut to obtain strip fiber layer; S2 Wrapped Strip Fiber Layer: A strip fiber layer is wrapped with plant fiber needle-punched nonwoven fabric; S3 Preparation of Tampons: Fix the cotton thread in the center of the strip fiber layer, with the end of the cotton thread exposed 10-20cm outside the strip fiber layer. Then, roll the strip fiber layer to form a cylindrical absorbent body. After pressing and shaping in a forming device, microwave heating treatment is performed to obtain the tampon body. The tampon body is inserted into the applicator connected to the push rod to make a tampon.

[0029] Modified lyocell nonwoven fabric has good water absorption and hydrogel properties. When used to wrap organic degreased cotton to prepare tampons, it increases the absorbency of tampons and overcomes the defect of traditional nonwoven fabrics that do not absorb menstrual blood. After absorbing menstrual blood, the outer surface of the tampon forms a hydrogel film, making it easy to remove after use and improving comfort.

[0030] The microwave heating process mentioned here involves a temperature of 160°C (hot pressing for 3 seconds).

[0031] Before step S2, drainage holes are first set: the plant fiber needle-punched nonwoven fabric is cut into strips, and several indentations are set on one side of the center line of the strip plant fiber needle-punched nonwoven fabric. Each indentation is provided with a drainage hole. The indentations are straight or curved, and the drainage holes are straight and circular with a diameter of 0.5-1.5 mm. The number of drainage holes is set to 2-8, and the spacing between the drainage holes is set to 3-5 mm. Then, sanitary tampons are prepared.

[0032] When modified seaweed fiber nonwoven fabric, calcium alginate nonwoven fabric, and modified lyocell nonwoven fabric replace the outer wrapping fabric of existing tampons, the absorbent core of the tampon is organic degreased cotton, and the outer layer of the organic degreased cotton is wrapped with plant fiber needle-punched nonwoven fabric. The calcium ions contained in the calcium alginate nonwoven fabric undergo a cross-linking reaction with the sodium ions in menstrual blood, producing sodium alginate, which has high hygroscopicity and produces a gel effect. In the application of this nonwoven fabric in the preparation of feminine hygiene products, the calcium alginate nonwoven fabric is used as the absorbent core material of sanitary napkins or as the outer wrapping fabric of tampons. The surface of the calcium alginate nonwoven fabric is coated with calcium alginate particles, and the sodium alginate produced after the cross-linking reaction with the sodium ions in menstrual blood has high hygroscopicity and produces a gel. The sanitary napkin core prepared with it forms a gel film after absorbing moisture, keeping the surface dry and preventing side leakage, greatly improving comfort. As the wrapping fabric of tampons, it exhibits its unique superior properties, with a slippery feel due to the gel formed after absorbing moisture, greatly improving the user's experience.

[0033] Compared with existing technologies, this invention uses modified seaweed fiber nonwoven fabric, modified lyocell nonwoven fabric, and calcium alginate nonwoven fabric to prepare the absorbent core of sanitary napkins, or for use as a tampon wrapping or the entire tampon, replacing polymer materials. It is green, environmentally friendly, and biodegradable, simplifying the processing of sanitary napkins and tampons. Because the hydrogel-type nonwoven fabric has high absorbency and forms a gel upon contact with water, it is easy to remove after use, making it more convenient and improving comfort. The raw materials used in this invention are natural and environmentally friendly, non-toxic and harmless to the human body, and biodegradable. Alginate itself has antibacterial and anti-inflammatory effects, eliminating or reducing odor, making it environmentally friendly for women and providing a comfortable and relaxing physiological experience, suitable for large-scale application and promotion.

[0034] Example 3: This embodiment provides a method for preparing sanitary napkins made of plant fiber needle-punched nonwoven fabric suitable for feminine hygiene products. In a specific embodiment of the present invention, the method includes the following steps: Preparation of plant fiber needle-punched nonwoven fabric: Single-layer mesh fibers are stacked, with each pair of fibers stacked perpendicularly to each other. The number of stacked layers is 4-16, and finally a multi-layer fiber web is formed. Then, the plant fiber needle-punched nonwoven fabric is obtained through a needle-punching process, which serves as the absorbent core layer. Preparation of sanitary napkins: 2-8 layers of plant fiber needle-punched nonwoven fabric are covered onto the absorbent core layer, followed by processes such as groove forming, bottom film application, back wing release paper attachment, perimeter sealing and shaping, external cutting, film coating and quick-apply application, horizontal sealing, and cutting to produce the sanitary napkin. Both the modified seaweed fiber and modified lyocell fiber exhibit hydrogel properties upon contact with water, resulting in high absorbency. Both seaweed fiber and lyocell fiber are pure plant fibers, natural, environmentally friendly, and biodegradable.

[0035] The core parameters of the acupuncture process are: Acupuncture frequency: Standard models typically operate at frequencies below 1200 cycles / min, while wide-range, high-load models can achieve higher frequencies through structural optimization.

[0036] Frequency, output speed, and needle density need to be comprehensively controlled: for every 0.1 m / min increase in output speed, the frequency needs to be increased by 5-8 times / min; for every 10 needles / cm² increase in needle density, the corresponding frequency needs to be increased by 50-80 times / min.

[0037] Needle puncture density: Defined as the number of needles inserted per unit area, it directly affects the tightness of fiber entanglement and product strength.

[0038] It needs to be set according to product requirements. For example, when preparing high-temperature resistant filter media, it is necessary to maintain a density of 1040 punctures / cm and a frequency of 450 times / min.

[0039] Example 4: In a specific embodiment of the present invention, this embodiment involves a modified seaweed fiber nonwoven fabric, wherein seaweed fiber and lyocell fiber are mixed in a mass ratio of 20:80. The water absorption rate of this hydrogel-type nonwoven fabric is tested to be 40g / 1g, that is, 1g of hydrogel-type nonwoven fabric can absorb 40g of water. Compared with the nonwoven fabric before water absorption, the length, width, and thickness of the nonwoven fabric after water absorption do not change significantly.

[0040] Example 5: Example Bloodsucking rate (g / g) Absorption rate (s) Breathability (mm / s) Reverse osmosis volume (g) Notes (all figures are based on 200 grams) This application has a matching ratio of 1. 23 9.65 165 0.67 Modified lyocell fiber 30%, seaweed fiber 10%, lyocell fiber 60% This application has a matching ratio of 2. 25 11.88 157 0.63 Seaweed fiber 10%, modified lyocell fiber 35%, lyocell fiber 55%. This application has a matching ratio of 3. 27 12.37 140 0.56 Modified lyocell fiber 40%, seaweed fiber 10%, lyocell fiber 50% Comparative Example 1 19 14.52 135 0.91 Traditional composite absorbent paper contains 50% SAP superabsorbent polymer resin, 40% wood pulp, and 10% wet-strength paper. Comparative Example 2 21 15.62 122 0.87 Traditional composite absorbent paper contains 60% SAP superabsorbent polymer resin, 30% wood pulp, and 10% wet-strength paper. Comparative Example 3 22 17.46 114 0.79 Traditional composite absorbent paper contains 65% SAP superabsorbent polymer resin, 25% wood pulp, and 10% wet-strength paper.

[0041] Degradability Data Sheet Fiber type Test environment Degradation time Degradation rate Complete degradation seaweed fiber Soil burial 3-6 months 100% (Completely Degradable) yes Kinsell Lysell Soil burial 7 months 90.1% No (over 90% degraded) Tencel Lyocell Soil burial 55 days 100% (Completely Degradable) yes VEOCEL Compost (28℃) 55 days 92.6%±0.9% No (over 90% degraded) Tencel Lyocell Freshwater environment 42 days 100% (Completely Degradable) yes Tencel Lyocell Marine environment 63 days 100% (Completely Degradable) yes

[0042] With its bio-antibacterial and deodorizing functions, seaweed fiber is a natural fiber extracted from seaweed. It contains polysaccharides and special alginic acid compounds, which have excellent antibacterial and deodorizing effects. It meets the national standard of 7A for antibacterial properties, as monitored by national professional institutions. After 150 washes, it achieves a 99% inhibition rate against Staphylococcus aureus, a 90% inhibition rate against Escherichia coli, and a 96% inhibition rate against Candida albicans. Seaweed fiber can also decompose odors, reducing the concentration of ammonia odor components by up to 97.8%.

[0043] The preparation process of seaweed fiber involves first extracting sodium alginate from algae, and then processing the sodium alginate into seaweed fiber. Sodium alginate, with its excellent biodegradability, biocompatibility, and stability, is widely used in the medical and food processing fields, making seaweed fiber itself very safe. Seaweed fiber also possesses excellent antibacterial properties, with inhibition rates exceeding 99% against Escherichia coli, Staphylococcus aureus, and Candida albicans. The following is an SGS test report.

[0044] The test results are shown in the table below:

[0045] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0046] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plant fiber needle punched nonwoven fabric suitable for use in feminine hygiene products, characterized by, The plant fiber needle-punched nonwoven fabric includes at least one of modified seaweed fiber nonwoven fabric, modified lyocell nonwoven fabric and calcium alginate nonwoven fabric, and is used as a sanitary napkin core body or a sanitary tampon or a sanitary tampon wrapping cloth.

2. The plant fiber needle punched nonwoven fabric for feminine hygiene products according to claim 1, characterized by, The raw material components of the modified seaweed fiber nonwoven fabric are seaweed fiber, lyocell fiber / viscose fiber and lyocell modified fiber, and the mass ratio is 20%-80%, 20%-80% and 20%-80%, respectively; only the seaweed fiber is modified, and the lyocell fiber / viscose fiber and the lyocell modified fiber are unmodified base raw materials.

3. A modified production process of a plant fiber needle punched nonwoven fabric suitable for a feminine hygiene product, characterized by, The preparation process of the modified seaweed fiber nonwoven fabric and the modified lyocell nonwoven fabric includes alkalization, etherification, neutralization and post-treatment steps.

4. The modified preparation process of a plant fiber needle punched nonwoven fabric suitable for a feminine hygiene product according to claim 3, characterized in that, The specific steps are as follows: Alkalization: After the pretreatment is completed, an alkali solution is poured into a reaction container for alkalization treatment, the alkali solution is composed of alkali, water and an additive, the alkali is sodium hydroxide, sodium carbonate or sodium bicarbonate, and the additive is sodium dodecyl benzene sulfonate (SDS); Etherification: after the alkalization is completed, an etherification solution is added to the reaction container for reaction stirring, the etherification solution solute is composed of one or more of chloroacetic acid and sodium chloroacetate, and ethanol is further added; Neutralization: after the modified composite fiber is extruded, an eluent is used for neutralization elution, the eluent is composed of hydrochloric acid, ethanol and water; Post-treatment: after the modified composite fiber is dried, the collagen infiltration solution is uniformly sprayed into the modified composite fiber through a spraying device in a stirring container, the spraying device is driven by compressed air to uniformly spray the solution in the form of an aerosol onto the surface of the fiber, so that the collagen infiltration solution is fully infiltrated and loaded in the gap between the fiber tows.

5. The modified preparation process of a plant fiber needle punched nonwoven fabric suitable for a feminine hygiene product according to claim 4, characterized in that, The pretreatment is performed on cellulose fiber as a raw material in an organic solvent, so that the initial structure of the cellulose fiber can be retained, and the collagen infiltration solution is composed of ethanol, water, collagen, a humectant and a surfactant.

6. The modified preparation process of a plant fiber needle punched nonwoven fabric suitable for a feminine hygiene product according to claim 4, characterized in that, The collagen content of the collagen infiltration solution is 4-30%, the collagen is derived from the skin, bones or connective tissue of animals, the humectant is 0.4-1.5%, and the humectant is composed of one or more of ethylene glycol, propylene glycol and glycerol.

7. The modified process for the preparation of a needle punched nonwoven fabric of plant fibers suitable for feminine hygiene products according to claim 4, characterized by the fact that, The surfactant is 0.05-1.0%, and the surfactant is composed of one or more of Tween, Span, alkylol amide (FFA), fatty alcohol polyoxyethylene ether (AE) and lecithin.

8. A sanitary tampon preparation method of a plant fiber needle-punched nonwoven fabric suitable for female sanitary products, characterized in that, S1: preparing a strip-shaped fiber layer: organic defatted cotton is carded, laid into a single layer of fibers, and then stacked into a 4-16 layer fiber web, and then pressed, shaped and cut to obtain a strip-shaped fiber layer; S2: wrapping the strip-shaped fiber layer: wrapping the strip-shaped fiber layer with a plant fiber needle-punched nonwoven fabric; S3: preparing a sanitary tampon: fixing a cotton thread at the center position of the strip-shaped fiber layer, exposing the tail end of the cotton thread outside the strip-shaped fiber layer by 10-20 cm, then curling the strip-shaped fiber layer to form a cylindrical absorbent body, and then performing microwave heating treatment after being pressed and shaped in a shaper, to obtain a tampon body of the sanitary tampon, and then loading the tampon body into a catheter connected with a push rod to prepare the sanitary tampon.

9. The method of claim 8, wherein the sanitary tampon is prepared by needle punching the plant fiber nonwoven fabric for a female sanitary product. Before the S2 step, a flow guide hole is set: the plant fiber needle-punched non-woven fabric is cut into a strip, a plurality of indentations are arranged on one side of the center line of the strip-shaped plant fiber needle-punched non-woven fabric, each indentation is provided with a flow guide hole, the indentation is linear or curved, the flow guide hole is a linear flow guide hole, the flow guide hole is circular, the diameter is set to 0.5-1.5mm, the number of flow guide holes is set to 2-8, and the flow guide hole spacing is set to 3-5mm, and then a sanitary tampon is prepared.

10. A sanitary napkin manufacturing method of a plant fiber needle punched nonwoven fabric suitable for a feminine hygiene product, characterized by, It comprises the following steps: Preparation of plant fiber needle-punched non-woven fabric: stacking single-layer mesh fibers, stacking every two layers of fibers vertically, the number of stacked layers is 4-16, and finally forming a multi-layer fiber mesh, then obtaining a plant fiber needle-punched non-woven fabric through a needle-punching process as an absorbent core layer; Preparation of sanitary napkin: covering 2-8 layers of plant fiber needle-punched non-woven fabric on the absorbent core layer, and then going through the processes of concave channel forming, bottom film covering, pasting back wing release paper, week sealing and shaping, outer cutting shaping, covering package film and quick and easy pasting, horizontal sealing and cutting, to prepare the sanitary napkin.

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