Dry-process papermaking non-woven fabric from wormwood and preparation process of dry-process papermaking non-woven fabric

Abstract

The invention relates to the field of preparation processes of dry papermaking technologies, in particular to a preparation process of a wormwood-sourced dry papermaking non-woven fabric. The dry papermaking main body comprises a surface antibacterial and bacteriostatic layer, a middle moisture regain prevention layer and a bottom breathable layer; the antibacterial and bacteriostatic layer is composed of 50% of wormwood fibers and 50% of hot melting fibers, the thickness is 0.1-0.5 mm, the gram weight range is 10-15 gsm, the fineness of the wormwood fibers is 1.2-2D, and the length is 38-56 mm; the moisture regain prevention layer is composed of ES fibers, the ES fibers of 0.8-2D are used, the thickness ranges from 0.2 mm to 0.4 mm, and the gram weight ranges from 9 gsm to 15 gsm; the breathable layer is composed of 30% of wood pulp and 70% of hot melting fibers, the thickness of the breathable layer is 0.15-0.4 mm, and the gram weight range of the breathable layer is 15-20 gsm; the dry papermaking non-woven fabric takes the wormwood as a main raw material, the non-woven fabric can have good antibacterial performance by utilizing the natural antibacterial and bacteriostatic effects of the wormwood, can be applied to health care products to reduce bacterium breeding and infection, and also has the effects of warming channels and expelling cold, clearing damp and relieving itching and the like.

Description

Technical Field

[0001] The invention relates to the field of dry papermaking technology and preparation process, and in particular to a dry papermaking nonwoven fabric derived from wormwood and a preparation process thereof. Background Art

[0002] Traditional dry-laid papermaking nonwoven fabrics are also called dust-free paper, which is a type of dry-laid nonwoven fabrics. Dust-free paper has unique physical properties, such as high elasticity, softness, excellent hand feel and drape, high water absorption and good water retention, and is widely used in the fields of sanitary care products, special medical products, industrial wiping products, etc. It uses air-laid technology to loosen the wood pulp fiberboard into a single fiber state, and then uses airflow to condense the fibers on the web curtain to form a fiber web; this method allows the fibers to be evenly distributed during the web-forming process to form a relatively loose structure, and then a thermal bonding reinforcement process is used to mix hot-melt fibers into the wood pulp fibers. After air-laid, the low-melting-point fibers in the fiber web are melted by hot air and hot rolling to reinforce the fiber web into cloth.

[0003] The nonwoven fabric produced by the thermal bonding method does not contain chemical adhesives, and the product has better fluffiness and moisture absorption. It is usually used as the absorbent core of highly absorbent sanitary products, thin sanitary napkins for women, etc.; but the traditional dry paper nonwoven fabric absorbs human menstrual blood during use, which easily causes the liquid in the menstrual blood to rehydrate, causing a sticky and uncomfortable feeling to the user, and cannot inhibit the massive growth of bacteria in the menstrual blood. It is easy to produce odor during use, and it is very easy to cause bacterial infection and itching in the private parts, thereby reducing the user's comfort and safety, and making it inconvenient for people to use. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and provide a preparation process for dry-laid papermaking non-woven fabrics derived from mugwort. Mugwort is used as the main raw material, and the natural antibacterial and antibacterial effects of mugwort are utilized to add it to dry-laid papermaking non-woven fabrics, so that the non-woven fabrics have good antibacterial properties. When used in sanitary care products, it can reduce bacterial growth and infection, and also has the effects of warming the meridians and dispersing cold, removing dampness and relieving itching.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A dry-laid papermaking nonwoven fabric derived from mugwort comprises a dry-laid papermaking main body, wherein the dry-laid papermaking main body comprises an antibacterial and antibacterial layer on the surface, an anti-moisture regain layer in the middle layer and a breathable layer on the bottom layer; the antibacterial and antibacterial layer contains mugwort fiber and hot-melt fiber, the anti-moisture regain layer is composed of ES fiber, and the breathable layer is composed of wood pulp and hot-melt fiber.

[0006] Preferably, the antibacterial and antimicrobial layer is composed of 50% wormwood fiber and 50% hot-melt fiber, the anti-moisture regain layer is composed of ES fiber, and the breathable layer is composed of 30% wood pulp and 70% hot-melt fiber.

[0007] Preferably, the antibacterial and antibacterial layer has a thickness of 0.1mm-0.5mm and a gram weight range of 10gsm-15gsm, wherein the fineness of the wormwood fiber is 1.2D-2D and the length is 38mm-56mm; the antibacterial and antibacterial layer is prepared with wormwood fiber, and the natural antibacterial and antibacterial effect of wormwood is utilized to make the non-woven fabric have good antibacterial properties, and wormwood also has the effects of warming the meridians and dispersing cold, removing dampness and relieving itching. When the non-woven fabric containing wormwood components comes into contact with human skin, the wormwood components can be absorbed or volatilized through the skin, which can promote blood circulation, relieve fatigue, and have certain health care effects on the human body; the antibacterial and antibacterial layer is composed of 50% wormwood fiber and 50% hot-melt fiber, and its main function is to play the antibacterial and antibacterial role of the dry papermaking non-woven fabric, while also taking into account the combination with other layers and the overall softness and breathability factors. The thickness of the entire layer is controlled between 0.1-0.5mm. If the thickness is less than 0.1mm, the content of wormwood fiber may not be able to fully exert its antibacterial and antibacterial effects, and the antibacterial and antibacterial effects of the non-woven fabric will be greatly reduced. If the thickness is greater than 0.5mm, the entire non-woven fabric will be too thick in this layer, making the overall flexibility and air permeability of the entire non-woven fabric worse; the fineness of wormwood fiber is 1.2D-2D, and the length is 38mm-56mm, which can improve the overall tensile strength of the non-woven fabric. Long fibers can also improve the tear strength of the non-woven fabric, increasing its stability and durability during use; at the same time, the low water retention of wormwood fiber is utilized to reduce the water retention ability of the surface layer of the non-woven fabric, so that when it is used as a sanitary care product, the user will not feel sticky or other discomfort at the position where it fits the skin, thereby improving the comfort of the non-woven fabric.

[0008] Preferably, the moisture-proof layer uses 0.8D-2D ES fiber with a thickness of 0.2mm-0.4mm and a gram weight range of 9gsm-15gsm; the breathable layer has a thickness of 0.15mm-0.4mm and a gram weight range of 15gsm-20gsm; the moisture-proof layer is composed of 100% ES fiber, which has good moisture absorption properties and can effectively absorb and retain moisture, thereby enhancing the moisture absorption capacity of the middle layer, effectively absorbing and locking the liquid components in menstrual blood, and avoiding more discomfort caused by the rewetting of body fluids to the user; the thickness of the moisture-proof layer is between 0.2-0.4mm, and a thinner moisture-proof layer (less than 0.2mm) may not be able to protect the menstrual blood from moisture absorption. The nonwoven fabric can effectively absorb menstrual blood, and the absorption of menstrual blood is not clean. A thicker anti-regain layer (greater than 0.4mm) will cause the entire nonwoven fabric to become bloated, increasing the discomfort of using the nonwoven fabric. The breathable layer is composed of 30% wood pulp and 70% hot-melt fiber. The wood pulp fiber has good liquid absorption performance and can quickly absorb water and other liquids. The mesh structure of the combination of wood pulp fiber and hot-melt fiber makes the nonwoven fabric have good breathability and is very suitable for use as a sanitary care product. The thickness is between 0.15mm-0.4mm, so that there are enough breathable channels between the fiber combination of the breathable layer, the breathable effect is better, and it will not be restricted by other layers.

[0009] Preferably, the preparation method of the wormwood fiber includes: collecting fresh wormwood without pests and impurities, removing impurities and dead leaves, washing it, putting it into a dryer and drying it at a low temperature of 40-60°C for 8-12 hours to obtain wormwood with a moisture content of about 10%; putting the dried wormwood into a wormwood grinder and crushing it into fibers, and the length of the crushed wormwood fibers is between 38mm-56mm to meet the requirements of subsequent dry papermaking for the length of wormwood fibers; soaking the obtained wormwood fibers in a swelling agent solution with a NaOH concentration of 1%-3%, the soaking temperature is 20°C-30°C, and the time is 1-2h; the soaked wormwood fibers are rinsed with clean water until the pH value of the rinse liquid is close to neutral, so as to remove the alkali solution residual on the wormwood fibers to obtain neutral wormwood fibers; wormwood contains a variety of volatile effective ingredients, such as volatile oils, flavonoids, etc. These ingredients are the key to the antibacterial, antibacterial, anti-inflammatory and analgesic effects of wormwood. Under high temperature conditions, these volatile oils are easy to evaporate. The loss of these active ingredients will greatly reduce the medicinal effect of wormwood, while low-temperature drying (between 40℃-60℃) can effectively reduce the loss of these active ingredients and ensure the quality and value of wormwood. At the same time, wormwood fiber is sensitive to temperature. High-temperature drying will change the internal structure of the fiber, resulting in a decrease in fiber strength and poor flexibility. Low-temperature drying can keep the wormwood fiber in good physical properties during the drying process, so that it has better performance in the subsequent papermaking process. The wormwood fiber obtained after crushing is soaked in a swelling agent containing a low concentration of NaOH. Swelling can help the wormwood fiber to be better separated into single fibers, ensuring that the fibers are evenly distributed in the subsequent papermaking process. At the same time, the swelled fibers can become softer and more elastic, which improves the flexibility and plasticity of the wormwood fiber. The internal structure of the wormwood fiber after swelling becomes looser, and more pores are produced to allow the fiber to absorb more water, thereby improving the water absorption of the wormwood fiber.

[0010] Preferably, the preparation method of modified wormwood fiber based on the wormwood fiber includes soaking the obtained wormwood fiber in an antibacterial agent solution containing chitosan, the concentration of the chitosan solution is 2%-5%, the soaking temperature is controlled between 30°C-40°C, and the time is 2-4 hours; after soaking, take out and dry, so that the antibacterial agent can adhere to the surface of the wormwood fiber to obtain modified wormwood fiber; chitosan itself has good antibacterial and antifungal properties, and has an inhibitory effect on a variety of bacteria, fungi and other microorganisms. When the wormwood fiber is soaked in an antibacterial agent solution containing chitosan, the chitosan will be adsorbed on the surface of the wormwood fiber and penetrate into the interior of the wormwood fiber. In the subsequent use process The natural antibacterial and antimicrobial properties of wormwood fiber and the antibacterial and antibacterial properties of chitosan enable non-woven fabrics to fully exert their antibacterial functions. When this antibacterial non-woven fabric is used in female hygiene care products, it can effectively inhibit the massive growth of bacteria in menstrual blood. At the same time, the modified wormwood fiber enhances the adsorption capacity and can better absorb the odor in menstrual blood, greatly reducing the occurrence of bacterial infection and itching in private parts. In addition, chitosan, as a natural polysaccharide, has good biocompatibility. Wormwood fiber treated with chitosan will be more skin-friendly. When wormwood fiber comes into contact with the skin, it will not cause adverse reactions such as irritation or allergies, thereby improving the comfort and safety of the use process.

[0011] Preferably, the preparation of the mugwort fiber is also provided with a preparation device, including a low-temperature dryer and a mugwort crusher, the low-temperature dryer is arranged on the mugwort conveyor belt, and the tail end of the mugwort conveyor belt is connected to the feed hopper of the mugwort crusher; the low-temperature dryer is arranged on the mugwort conveyor belt, and the tail end of the mugwort conveyor belt is connected to the feed hopper. It is only necessary to put the mugwort into the low-temperature dryer, set the drying temperature and drying time, and the low-temperature dryer starts working. When the drying is completed, the program will automatically start the mugwort conveyor belt and the mugwort crusher, which improves the degree of automation, can smoothly transport the mugwort to the mugwort crusher, reduces the labor intensity of manual feeding, and at the same time improves the uniformity and continuity of the feeding.

[0012] Preferably, the mugwort grinder is also provided with a grinding chamber, one end of the grinding chamber is connected to the feed hopper, and the other end is connected to the discharge port; the grinding chamber includes a grinding spindle, an arc plate and an arc plate adjusting rod, a grinding cutter head is installed on the grinding spindle, and raised grinding teeth are provided on the inner side of the arc plate; the grinding spindle is also provided with a spindle pulley connected to the motor pulley of the high-speed motor of the mugwort grinder through a belt; the spindle pulley on the grinding spindle is connected to the motor pulley of the high-speed motor through a belt, and the rotation of the high-speed motor will drive the grinding spindle of the mugwort grinder to rotate at a high speed; a grinding cutter head is installed on the grinding spindle, and the speed of the grinding spindle can be controlled by controlling the speed of the high-speed motor. The higher the speed of the grinding spindle, the more times the grinding cutter head cuts the mugwort per unit time, and the shorter the length of the mugwort fiber. Conversely, when the speed of the grinding spindle is low When it is lowered, the time interval between each cutting will become slightly longer, and the length of the wormwood fiber will be longer; at the same time, the number of teeth on the crushing blade can also control the length of the crushed wormwood fiber. When the number of teeth is large, there will be more cutting points during the crushing process, and the fiber is easier to be chopped. After appropriately reducing the number of teeth, the obtained fiber length will increase accordingly; at the same time, an arc plate is also provided in the crushing chamber, and raised crushing teeth are also provided on the inner side of the arc plate. The arc plate cooperates with the crushing blade to increase the crushing force of the wormwood and improve the crushing effect. The arc plate adjustment rod can also adjust the distance between the arc plate and the crushing blade. Through the distance adjustment, wormwood fibers of different finenesses and different crushing effects can be obtained. The closer the distance, the better the crushing effect, and the finer the obtained wormwood fiber fineness. Conversely, the farther the distance, the crushing effect will have a certain degree of false touch, and the obtained wormwood fiber fineness will increase.

[0013] Preferably, a screening device is provided below the discharge port of the mugwort grinder, the screening device comprising a screening frame, a screening base and a vibration motor, a buffer spring is provided between the screening frame and the screening base; the screening frame is also provided with a coarse material outlet and a screening material outlet, which are separated by a screening mesh; the screening device is provided below the discharge port, and the fibers at the discharge port fall directly onto the screening frame for screening the mugwort fibers, and a screening mesh is installed on the screening frame, and the mugwort fibers that meet the particle fineness requirements will be screened out and fall to the bottom layer of the screening frame, and finally come out through the screening material outlet of the bottom layer, while the mugwort fibers that do not meet the fineness requirements will remain on the screen and finally be screened out through the coarse material outlet, and the sieve holes on the screen can be selected and replaced according to actual needs; the vibration motor on the screening device can allow the mugwort fibers to pass through the screen more quickly through vibration, thereby improving the screening efficiency.

[0014] The present invention also provides a process for preparing a dry papermaking nonwoven fabric derived from mugwort, which is characterized by comprising the following steps: S1. Preparation of the surface antibacterial and antibacterial layer: put the treated wormwood fiber and the hot-melt fiber into a mixer in a ratio of 1:1 and mix them. The mixer speed is 500-1000 rpm and the mixing time is 15-30 minutes, so that the wormwood fiber and the hot-melt fiber can be fully mixed and evenly mixed; the mixed fibers are laid by air-laid method, and the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow to form a fiber web. The thickness of the fiber layer is 0.1mm-0.5mm; S2. Preparation of the middle anti-moisture regain layer: 0.8D-2D ES fibers are selected and put into a fiber scattering machine for scattering, and then the ES fibers are blown onto a forming net by a high-speed airflow to form a fiber layer with a thickness of 0.2mm-0.4mm; S3, preparation of the bottom breathable layer: wood pulp fiber and hot melt fiber are mixed in a ratio of 30%:70% and put into a mixer, the mixer speed is 800-1000 rpm, the mixing time is 20-30 minutes, so that the two fibers are fully mixed; the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow using an air-laid method to form a fiber web, and the fiber layer thickness is 0.15mm-0.4mm; S4. Preparation of three-layer fiber web by thermal bonding: preheat the laid three-layer fiber web, the preheating temperature of the antibacterial and antibacterial layer is 100-130℃, the time is 6-10 minutes, the preheating temperature of the anti-re-moisture layer is 120-140℃, the time is 5-9 minutes, the preheating temperature of the breathable layer is 100-130℃, the time is 5-7 minutes; after preheating, the three-layer fiber web is stacked in sequence and put into the hot pressing equipment for hot pressing reinforcement, the hot pressing temperature is 120-160℃, the hot pressing pressure is 1-3MPa, and the hot pressing time is 10-30s; after hot pressing, the dry papermaking nonwoven fabric is taken out and placed in a well-ventilated environment for natural cooling. After cooling and shaping, the production is completed.

[0015] In summary, the beneficial effects of the present invention are: 1. The invention discloses a process for preparing a dry-laid papermaking nonwoven fabric from mugwort, which uses mugwort as the main raw material and utilizes the natural antibacterial and antimicrobial effects of mugwort to add it to the dry-laid papermaking nonwoven fabric, so that the nonwoven fabric has good antibacterial properties, and can be used in female hygiene care products to reduce bacterial growth and infection, and also has the effects of warming the meridians, dispelling cold, removing dampness and relieving itching; 2. The preparation process of the dry-laid papermaking nonwoven fabric from wormwood of the present invention utilizes the low water-locking property of wormwood fiber to reduce the water-locking capacity of the surface layer of the dry-laid papermaking nonwoven fabric, so that when it is used as a sanitary care product, the user's private parts will not feel sticky or other discomfort. The anti-rewetting layer in the middle layer can effectively absorb and lock the liquid components in menstrual blood, avoiding the rewetting of body fluids causing more discomfort to the user, and greatly improving the comfort of the use process; 3. The invention discloses a process for preparing a dry-laid papermaking nonwoven fabric derived from wormwood. The modified wormwood fiber obtained by modifying the wormwood fiber with a chitosan solution has better antibacterial function. When the antibacterial dry-laid papermaking nonwoven fabric is used in female hygiene care products, it can effectively inhibit the massive growth of bacteria in menstrual blood. At the same time, the modified wormwood fiber has enhanced adsorption capacity and can better absorb the odor in menstrual blood, greatly reducing the occurrence of bacterial infection and itching in female private parts, and improving the comfort and safety of the nonwoven fabric during use. 4. The present invention discloses a process for preparing a dry-laid papermaking nonwoven fabric derived from mugwort. The dry-laid papermaking nonwoven fabric itself is an environmentally friendly material that is degradable and recyclable. Mugwort is a natural plant material. Combining it with nonwoven fabric can further improve the environmental friendliness of the nonwoven fabric, which is more in line with the demand of modern society for green and environmentally friendly products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the dry papermaking nonwoven fabric derived from mugwort of the present invention; Figure 2 It is a schematic structural diagram of a wormwood fiber preparation device of the present invention; Figure 3 It is a schematic diagram of the internal structure of the mugwort grinder of the present invention; Figure 4 The present invention is a schematic diagram of the process flow of preparing the wormwood fiber dry papermaking nonwoven fabric; Figure 5 The present invention is a schematic diagram of the process flow of preparing the modified wormwood fiber dry papermaking nonwoven fabric.

[0017] Markings in the figure: 1-dry papermaking body, 11-antibacterial and antibacterial layer, 12-anti-regain layer, 13-breathable layer, 2-low-temperature dryer, 3-wormwood conveyor belt, 4-wormwood crusher, 41-feed hopper, 42-crushing chamber, 421-crushing spindle, 422-arc plate, 423-arc plate adjustment rod, 424-crushing knife head, 425-crushing teeth, 426-spindle pulley, 43-discharge port, 44-high-speed motor, 441-motor pulley, 45-belt, 5-screening device, 51-screening frame, 511-coarse material outlet, 512-screening material outlet, 513-screening net, 52-screening base, 53-vibration motor, 54-buffer spring. DETAILED DESCRIPTION

[0018] The following specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

[0019] The present invention will be described in detail below with reference to the accompanying drawings by way of embodiments.

[0020] Example 1

[0021] according to Figure 1 As shown, a dry-laid papermaking nonwoven fabric derived from mugwort includes a dry-laid papermaking main body 1, which includes an antibacterial and antibacterial layer 11 on the surface, an anti-moisture regain layer 12 in the middle layer, and a breathable layer 13 on the bottom layer; the antibacterial and antibacterial layer 11 is composed of 50% mugwort fiber and 50% hot-melt fiber, the anti-moisture regain layer 12 is composed of ES fiber, and the breathable layer 13 is composed of 30% wood pulp and 70% hot-melt fiber.

[0022] according to Figure 2 As shown, the preparation of wormwood fiber is also provided with a preparation device, including a low-temperature dryer 2 and a wormwood crusher 4, the low-temperature dryer 2 is arranged on the wormwood conveyor belt 3, and the tail end of the wormwood conveyor belt 3 is connected to the feed hopper 41 of the wormwood crusher 4; the low-temperature dryer 2 is arranged on the wormwood conveyor belt 3, and the tail end of the wormwood conveyor belt 3 is connected to the feed hopper 41, and the wormwood only needs to be put into the low-temperature dryer 2, and the drying temperature and drying time are set, and the low-temperature dryer 2 starts working. When the drying is completed, the program will automatically start the wormwood conveyor belt 3 and the wormwood crusher 4, which improves the degree of automation, can smoothly transport the wormwood to the wormwood crusher 4, reduces the labor intensity of manual feeding, and also improves the uniformity and continuity of feeding.

[0023] according to Figure 2 , Figure 3As shown, the wormwood grinder 4 is also provided with a grinding chamber 42, one end of the grinding chamber 42 is connected to the feed hopper 41, and the other end is connected to the discharge port 43; the grinding chamber 42 includes a grinding spindle 421, an arc plate 422 and an arc plate adjustment rod 423, a grinding blade 424 is installed on the grinding spindle 421, and a raised grinding tooth 425 is arranged on the inner side of the arc plate 422; the grinding spindle 421 is also provided with a spindle pulley 426, which is connected to the motor pulley 441 of the high-speed motor 44 of the wormwood grinder 4 through The main shaft pulley 426 on the crushing main shaft 421 is connected to the motor pulley 441 of the high-speed motor 44 through the belt 45. The rotation of the high-speed motor 44 will drive the crushing main shaft 421 of the wormwood crusher 4 to rotate at a high speed. A crushing cutter head 424 is installed on the crushing main shaft 421. The speed of the crushing main shaft 421 can be controlled by controlling the speed of the high-speed motor 44. The higher the speed of the crushing main shaft 421, the more times the crushing cutter head 424 cuts the wormwood per unit time, and the wormwood fibers are finer. The shorter the length of the fiber, the shorter the fiber length will be. Conversely, when the speed of the crushing spindle 421 decreases, the time interval between each cutting will become slightly longer, and the length of the wormwood fiber will be longer. At the same time, the number of teeth on the crushing blade 424 can also control the length of the wormwood fiber after crushing. When the number of teeth is large, there will be more cutting points during the crushing process, and the fiber is easier to be chopped. After appropriately reducing the number of teeth, the obtained fiber length will increase accordingly. An arc plate 422 is also provided in the crushing chamber 42, and a raised crushing tooth 425 is also provided on the inner side of the arc plate 422. The arc plate 422 cooperates with the crushing blade 424 to increase the crushing force of the wormwood and improve the crushing effect. The arc plate adjustment rod 423 can also adjust the distance between the arc plate 422 and the crushing blade 424. Through the distance adjustment, wormwood fibers of different finenesses and different crushing effects can be obtained. The closer the distance, the better the crushing effect, and the finer the fineness of the obtained wormwood fiber. Conversely, the farther the distance, the crushing effect will have a certain degree of false touch, and the fineness of the obtained wormwood fiber will increase.

[0024] according to Figure 2As shown, a screening device 5 is also provided below the discharge port 43 of the wormwood grinder 4, and the screening device 5 includes a screening frame 51, a screening base 52 and a vibration motor 53, and a buffer spring 54 is provided between the screening frame 51 and the screening base 52; a coarse material outlet 511 and a screening material outlet 512 are also provided on the screening frame 51, and the two are separated by a screening net 513; the screening device 5 is arranged below the discharge port 43, and the fibers of the discharge port 43 directly fall on the screening frame 51, which is used to screen the wormwood fibers. A screening mesh 513 is installed on the screening frame 51. The wormwood fibers that meet the particle fineness requirements will be screened out and fall to the bottom layer of the screening frame 51, and finally come out through the screening material outlet 512 at the bottom layer. The wormwood fibers that do not meet the fineness requirements will remain on the screen mesh 513 and finally be screened out through the coarse material outlet 511. The sieve holes on the screen mesh 513 can be replaced according to actual needs; the vibration motor 53 on the screening device 5 can allow the wormwood fibers to pass through the screen mesh 513 more quickly through vibration, thereby improving the screening efficiency.

[0025] according to Figure 4 As shown, the preparation method of wormwood fiber includes: Collect fresh wormwood without pests and impurities, remove impurities and dead leaves, wash it, put it into a dryer and dry it at a low temperature of 40-60°C for 8-12 hours to obtain wormwood with a moisture content of about 10%; put the dried wormwood into a wormwood grinder and grind it into fibers, the length of the crushed wormwood fibers is between 38mm and 56mm, which meets the requirements of subsequent dry papermaking for the length of wormwood fibers; soak the obtained wormwood fibers in a swelling agent solution with a NaOH concentration of 1%-3%, the soaking temperature is 20℃-30℃, and the time is 1-2h; rinse the soaked wormwood fibers with clean water until the pH value of the rinse liquid is close to neutral, so as to remove the alkali solution residual on the wormwood fibers to obtain neutral wormwood fibers.

[0026] Wormwood contains a variety of volatile active ingredients, such as volatile oils and flavonoids, which are the key to the antibacterial, anti-inflammatory and analgesic effects of wormwood. Under high temperature conditions, these volatile oils are easily volatilized and lost, which greatly reduces the medicinal effects of wormwood. Low-temperature drying (between 40℃ and 60℃) can effectively reduce the loss of these active ingredients and ensure the quality and value of wormwood. At the same time, wormwood fiber is more sensitive to temperature. High-temperature drying will change the internal structure of the fiber, resulting in a decrease in fiber strength and poor flexibility. Low-temperature drying can make wormwood fiber in the drying process. It maintains good physical properties, so that it has better performance in the subsequent papermaking process; the wormwood fiber obtained after crushing is soaked in a swelling agent containing a low concentration of NaOH, which can help the wormwood fiber to be better separated into single fibers after swelling, ensuring that the fibers can be evenly distributed in the subsequent papermaking process. At the same time, the fibers after swelling can become softer and more elastic, thereby improving the flexibility and plasticity of the wormwood fiber; and the internal structure of the wormwood fiber after swelling becomes looser, and more pores are produced to allow the fiber to absorb more water, thereby improving the water absorption of the wormwood fiber.

[0027] according to Figure 4 As shown, a process for preparing a dry papermaking nonwoven fabric from mugwort comprises the following steps: S1. Preparation of the surface antibacterial and antimicrobial layer: The treated wormwood fiber and the hot-melt fiber are put into a mixer in a ratio of 1:1 for mixing, the mixer speed is 500 rpm, and the mixing time is 15 minutes, so that the wormwood fiber and the hot-melt fiber can be fully mixed and evenly mixed; the mixed fibers are laid by air-laid method, and the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow to form a fiber web, and the thickness of the fiber layer is 0.1 mm; S2. Preparation of the middle anti-moisture regain layer: 0.8D ES fibers are selected and put into a fiber scattering machine for scattering, and then the ES fibers are blown onto a forming net by a high-speed airflow to form a fiber layer with a thickness of 0.2 mm; S3, preparation of the bottom breathable layer: wood pulp fiber and hot melt fiber are mixed in a ratio of 30%:70% and put into a mixer, the mixer speed is 800 rpm, the mixing time is 20 minutes, and the two fibers are fully mixed; the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow using an air-laid method to form a fiber web, and the fiber layer thickness is 0.15 mm; S4. Preparation of three-layer fiber web by thermal bonding: preheat the laid three-layer fiber web, the preheating temperature of the antibacterial and antimicrobial layer is 100°C for 6 minutes, the preheating temperature of the anti-regain layer is 120°C for 5 minutes, and the preheating temperature of the breathable layer is 100°C for 5 minutes; after preheating, stack the three-layer fiber web in sequence and put them into the hot pressing equipment for hot pressing reinforcement, the hot pressing temperature is 120°C, the hot pressing pressure is 1MPa, and the hot pressing time is 10s; after hot pressing, the dry papermaking nonwoven fabric is taken out and placed in a well-ventilated environment for natural cooling. After cooling and shaping, the production is completed.

[0028] The thickness of the antibacterial and antibacterial layer 11 is 0.1mm, and the gram weight is 10gsm, wherein the fineness of the wormwood fiber is 1.2D-2D, and the length is 38mm-56mm; the antibacterial and antibacterial layer 11 is prepared by wormwood fiber, and the natural antibacterial and antibacterial effect of wormwood is utilized to make the non-woven fabric have good antibacterial properties, and wormwood also has the effects of warming the meridians and dispelling cold, removing dampness and relieving itching. When the non-woven fabric containing wormwood ingredients comes into contact with human skin, the wormwood ingredients can be absorbed or volatilized through the skin, which can promote blood circulation, relieve fatigue, and have certain health care effects on the human body. The antibacterial and antibacterial layer 11 is composed of 50% wormwood fiber and 50% hot-melt fiber, so that the dry papermaking non-woven fabric has both antibacterial and antibacterial effects, and the antibacterial and antibacterial layer 11 as a whole has good flexibility and air permeability. If the thickness is less than 0.1mm, the content of wormwood fiber may not be able to fully exert its antibacterial and antibacterial effects, and the antibacterial and antibacterial effects of the non-woven fabric will be greatly reduced. If the thickness is greater than 0.5mm, the entire non-woven fabric will be too thick in this layer, making the overall flexibility and air permeability of the entire non-woven fabric worse; the fineness of wormwood fiber is 1.2D-2D, and the length is 38mm-56mm, which can improve the overall tensile strength of the non-woven fabric. Long fibers can also improve the tear strength of the non-woven fabric, increasing its stability and durability during use; at the same time, the low water retention of wormwood fiber is utilized to reduce the water retention ability of the surface layer of the non-woven fabric, so that when it is used as a sanitary care product, the user will not feel sticky or other discomfort at the position where it touches the skin, thereby improving the comfort of the non-woven fabric.

[0029] The moisture-proof layer 12 uses 0.8D-2D ES fiber, with a thickness of 0.2mm-0.4mm and a gram weight range of 9gsm-15gsm. The breathable layer 13 has a thickness of 0.15mm-0.4mm and a gram weight range of 15gsm-20gsm. The moisture-proof layer 12 is composed of 100% ES fiber. ES fiber has good moisture absorption performance and can effectively absorb and retain moisture, so that the moisture absorption capacity of the middle layer is enhanced, and the liquid components in the menstrual blood can be effectively absorbed and locked to avoid more discomfort caused by the resurgence of body fluids to the user. The thickness of the moisture-proof layer 12 is between 0.2-0.4mm. A thinner moisture-proof layer 12 (less than 0.2mm) may not be able to absorb the menstrual blood. The nonwoven fabric is not effectively absorbed, and the menstrual blood is not absorbed cleanly. A thicker anti-regain layer 12 (greater than 0.4 mm) will cause the entire nonwoven fabric to become bloated, increasing the discomfort of using the nonwoven fabric. The breathable layer 13 is composed of 30% wood pulp and 70% hot-melt fiber. The wood pulp fiber has good liquid absorption performance and can quickly absorb water and other liquids. The mesh structure of the combination of wood pulp fiber and hot-melt fiber makes the nonwoven fabric have good air permeability and is very suitable for use as a sanitary care product. Its thickness is between 0.15 mm and 0.4 mm, so that there are enough air permeable channels between the fiber combination of the breathable layer 13, and the air permeability effect is better, and it will not be restricted by other layers.

[0030] Example 2 The same as Example 1, except that the dry papermaking nonwoven fabric preparation process from mugwort comprises the following steps: S1. Preparation of the surface antibacterial and antibacterial layer: The treated wormwood fiber and the hot-melt fiber are put into a mixer in a ratio of 1:1 for mixing, the mixer speed is 800 rpm, and the mixing time is 20 minutes, so that the wormwood fiber and the hot-melt fiber can be fully mixed and evenly mixed; the mixed fibers are laid by air-laid method, and the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow to form a fiber web, the thickness of the fiber layer is 0.3 mm, and the gram weight is 12 gsm; S2. Preparation of the middle anti-moisture regain layer: 1.5D ES fibers are selected and put into a fiber scattering machine for scattering, and then the ES fibers are blown onto a forming net by a high-speed airflow to form a fiber layer with a thickness of 0.3 mm; S3, preparation of the bottom breathable layer: wood pulp fiber and hot melt fiber are mixed in a ratio of 30%:70% and put into a mixer, the mixer speed is 900 rpm, the mixing time is 25 minutes, and the two fibers are fully mixed; the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow using an air-laid method to form a fiber web, and the fiber layer thickness is 0.3 mm; S4. Preparation of three-layer fiber web by thermal bonding: preheat the laid three-layer fiber web, the preheating temperature of the antibacterial and antimicrobial layer is 110°C for 8 minutes, the preheating temperature of the anti-regain layer is 130°C for 7 minutes, and the preheating temperature of the breathable layer is 120°C for 6 minutes; after preheating, the three-layer fiber web is stacked in sequence and placed in a hot pressing device for hot pressing reinforcement, the hot pressing temperature is 140°C, the hot pressing pressure is 2MPa, and the hot pressing time is 20s; after hot pressing, the dry papermaking nonwoven fabric is taken out and placed in a well-ventilated environment for natural cooling. After cooling and shaping, the production is completed.

[0031] Example 3 The same as Example 1, except that the dry papermaking nonwoven fabric preparation process from mugwort comprises the following steps: S1. Preparation of the surface antibacterial and antimicrobial layer: The treated wormwood fiber and the hot-melt fiber are put into a mixer in a ratio of 1:1 for mixing, the mixer speed is 1000 rpm, and the mixing time is 30 minutes, so that the wormwood fiber and the hot-melt fiber can be fully mixed and evenly mixed; the mixed fibers are laid by air-laid method, and the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow to form a fiber web, and the thickness of the fiber layer is 0.5 mm and the gram weight is 15 gsm; S2. Preparation of the middle anti-moisture regain layer: 2D ES fibers are selected and put into a fiber scattering machine for scattering, and then the ES fibers are blown onto a forming net by a high-speed airflow to form a fiber layer with a thickness of 0.3 mm; S3, preparation of the bottom breathable layer: wood pulp fiber and hot melt fiber are mixed in a ratio of 30%:70% and put into a mixer, the mixer speed is 1000 rpm, the mixing time is 30 minutes, and the two fibers are fully mixed; the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow using an air-laid method to form a fiber web, and the fiber layer thickness is 0.2 mm; S4. Preparation of three-layer fiber web by thermal bonding: preheat the laid three-layer fiber web, the preheating temperature of the antibacterial and antimicrobial layer is 130°C for 10 minutes, the preheating temperature of the anti-regain layer is 140°C for 9 minutes, and the preheating temperature of the breathable layer is 130°C for 7 minutes; after preheating, stack the three-layer fiber web in sequence and put them into the hot pressing equipment for hot pressing reinforcement, the hot pressing temperature is 160°C, the hot pressing pressure is 3MPa, and the hot pressing time is 30s; after hot pressing, the dry papermaking nonwoven fabric is taken out and placed in a well-ventilated environment for natural cooling. After cooling and shaping, the production is completed.

[0032] Example 4 according to Figure 5As shown, the difference from the above-mentioned embodiment 1 is that the method for preparing modified wormwood fiber based on wormwood fiber includes: The obtained wormwood fiber is soaked in an antibacterial agent solution containing chitosan, the concentration of the chitosan solution is 2%, the soaking temperature is controlled between 30°C, and the soaking time is 2 hours; after the soaking, it is taken out and dried so that the antibacterial agent can adhere to the surface of the wormwood fiber to obtain modified wormwood fiber.

[0033] Chitosan itself has good antibacterial and antifungal properties, and has an inhibitory effect on a variety of bacteria, fungi and other microorganisms. When wormwood fiber is soaked in an antibacterial solution containing chitosan, chitosan will be adsorbed on the surface of the wormwood fiber and penetrate into the inside of the wormwood fiber. In the subsequent use process, the natural antibacterial and antibacterial properties of wormwood fiber and the antibacterial and antibacterial properties of chitosan enable the non-woven fabric to fully exert its antibacterial function. When this antibacterial non-woven fabric is used in female hygiene care products, it can effectively inhibit the massive growth of bacteria in menstrual blood. At the same time, the modified wormwood fiber enhances the adsorption capacity, which can better absorb the odor in menstrual blood, greatly reducing the occurrence of bacterial infection and itching in private parts; and chitosan, as a natural polysaccharide, has good biocompatibility. Wormwood fiber treated with chitosan will be more skin-friendly. When wormwood fiber comes into contact with the skin, it will not produce adverse reactions such as irritation or allergies, thereby improving the comfort and safety of the use process.

[0034] Example 5 The same as Example 4, except that the method for preparing modified wormwood fiber based on wormwood fiber includes: The obtained wormwood fiber is soaked in an antibacterial agent solution containing chitosan, the concentration of the chitosan solution is 5%, the soaking temperature is controlled between 40°C, and the soaking time is 4 hours; after the soaking, it is taken out and dried to allow the antibacterial agent to adhere to the surface of the wormwood fiber, thereby obtaining modified wormwood fiber.

[0035] Example 6 The same as Example 4, except that the method for preparing modified wormwood fiber based on wormwood fiber includes: The obtained wormwood fiber is soaked in an antibacterial agent solution containing chitosan, the concentration of the chitosan solution is 3%, the soaking temperature is controlled between 35°C, and the time is 3 hours; after the soaking, it is taken out and dried to allow the antibacterial agent to adhere to the surface of the wormwood fiber, thereby obtaining modified wormwood fiber.

[0036] Experimental testing: The absorption method was used to detect the antibacterial properties of dry-laid papermaking nonwovens: each dry-laid papermaking nonwoven was cut into the same size and placed in a container of bacterial suspension to allow the bacterial liquid to fully contact the dry-laid papermaking nonwovens. After the incubation, the number of bacteria on the sample was determined by the colony plate counting method, and the antibacterial rate was calculated by comparing it with the untreated sample.

[0037] The Cobb water absorption rate is used to test the water absorption of dry-laid papermaking nonwoven fabrics: each dry-laid papermaking nonwoven fabric is cut into the same size and placed on a horizontal glass plate. Then a certain amount of distilled water is absorbed with a straw and dripped from a height of 10 cm from the glass plate to allow the water to penetrate naturally. After 10 minutes, excess water on the surface of the dry-laid papermaking nonwoven fabric is absorbed with absorbent paper. The weight of the sample after absorbing water is weighed and compared with the weight before absorbing water. The water absorption rate can be calculated.

[0038] According to GB / T5453-1997 "Determination of Air Permeability of Textile Fabrics", the air permeability of dry-laid paper nonwovens is tested: each dry-laid paper nonwoven is fixed at the test head of the tester, and under a certain pressure difference, the amount of air passing through the sample per unit time is tested, and the air permeability of each dry-laid paper nonwoven can be calculated.

[0039] The antibacterial property, water absorption and air permeability of the dry-laid papermaking nonwoven fabrics prepared in the above embodiment and the dry-laid papermaking nonwoven fabrics prepared by the prior art were tested respectively:

[0040] From the above results, it can be seen that the antibacterial property, water absorption and air permeability of the wormwood-derived dry-laid papermaking nonwoven fabric obtained by Examples 1-6 of the present invention are better than those of the dry-laid papermaking nonwoven fabric produced by the prior art.

Claims

1. A dry-laid papermaking nonwoven fabric derived from mugwort, comprising a dry-laid papermaking body (1), characterized in that: The dry papermaking body (1) comprises an antibacterial and antibacterial layer (11) on the surface, an anti-moisture reversion layer (12) on the middle layer, and an air permeable layer (13) on the bottom layer; the antibacterial and antibacterial layer (11) contains wormwood fiber and hot-melt fiber, the anti-moisture reversion layer (12) is composed of ES fiber, and the air permeable layer (13) is composed of wood pulp and hot-melt fiber.

2. The dry-laid papermaking nonwoven fabric derived from mugwort according to claim 1, characterized in that: The antibacterial and bacteriostatic layer (11) is composed of 50% of wormwood fiber and 50% of hot-melt fiber, the anti-moisture regain layer (12) is composed of ES fiber, and the breathable layer (13) is composed of 30% of wood pulp and 70% of hot-melt fiber.

3. The dry-laid papermaking nonwoven fabric derived from mugwort according to claim 1, characterized in that: The antibacterial and antimicrobial layer (11) has a thickness of 0.1 mm to 0.5 mm and a gram weight range of 10 gsm to 15 gsm, wherein the fineness of the wormwood fiber is 1.2D to 2D and the length is 38 mm to 56 mm.

4. The dry-laid papermaking nonwoven fabric derived from mugwort according to claim 1, characterized in that: The moisture-proof layer (12) uses 0.8D-2D ES fiber, has a thickness of 0.2mm-0.4mm, and a gram weight range of 9gsm-15gsm; the breathable layer (13) has a thickness of 0.15mm-0.4mm, and a gram weight range of 15gsm-20gsm.

5. The process for preparing a dry-laid papermaking nonwoven fabric derived from mugwort according to claim 1, characterized in that: The preparation method of the wormwood fiber comprises: Collect fresh wormwood without pests and impurities, remove impurities and dead leaves, wash it, put it into a dryer and dry it at a low temperature of 40-60°C for 8-12 hours to obtain wormwood with a moisture content of about 10%; put the dried wormwood into a wormwood grinder and grind it into fibers. The length of the crushed wormwood fiber is between 38mm and 56mm, which meets the requirements of the subsequent dry papermaking for the length of the wormwood fiber; The obtained wormwood fiber is soaked in a swelling agent solution with a NaOH concentration of 1%-3%, the soaking temperature is 20℃-30℃, and the time is 1-2h; the soaked wormwood fiber is rinsed with clean water until the pH value of the rinse liquid is close to neutral, so as to remove the alkali solution remaining on the wormwood fiber to obtain neutral wormwood fiber.

6. The process for preparing a dry-laid papermaking nonwoven fabric derived from mugwort according to claim 5, characterized in that: The method for preparing modified wormwood fiber based on the wormwood fiber comprises: The obtained wormwood fiber is soaked in an antibacterial agent solution containing chitosan, the concentration of the chitosan solution is 2%-5%, the soaking temperature is controlled between 30℃-40℃, and the time is 2-4 hours; after the soaking, it is taken out and dried so that the antibacterial agent can adhere to the surface of the wormwood fiber to obtain modified wormwood fiber.

7. The process for preparing a dry-laid papermaking nonwoven fabric derived from mugwort according to claim 4, characterized in that: The preparation of the mugwort fiber uses a mugwort fiber preparation device, which includes a low-temperature dryer (2) and a mugwort crusher (4), wherein the low-temperature dryer (2) is arranged on a mugwort conveyor belt (3), and the rear end of the mugwort conveyor belt (3) is connected to the feed hopper (41) of the mugwort crusher (4).

8. The process for preparing a dry-laid papermaking nonwoven fabric derived from mugwort according to claim 7, characterized in that: The mugwort grinder (4) is further provided with a grinding chamber (42), one end of the grinding chamber (42) being in communication with the feed hopper (41), and the other end being in communication with the discharge port (43); the grinding chamber (42) comprises a grinding spindle (421), an arc plate (422) and an arc plate adjustment rod (423); a grinding blade head (424) is mounted on the grinding spindle (421), and raised grinding teeth (425) are arranged on the inner side surface of the arc plate (422); the grinding spindle (421) is further provided with a spindle pulley (426) connected to a motor pulley (441) of a high-speed motor (44) of the mugwort grinder (4) via a belt (45).

9. The dry-laid papermaking nonwoven fabric derived from mugwort according to claim 8, characterized in that: A screening device (5) is also provided below the discharge port (43) of the mugwort grinder (4), the screening device (5) comprising a screening frame (51), a screening base (52) and a vibration motor (53), a buffer spring (54) being provided between the screening frame (51) and the screening base (52); the screening frame (51) is also provided with a coarse material outlet (511) and a screened material outlet (512), the two being separated by a screening net (513).

10. A process for preparing a dry-laid nonwoven fabric derived from mugwort according to any one of claims 5 to 9, characterized in that: The following steps are involved: S1. Preparation of the surface antibacterial and antibacterial layer: put the treated wormwood fiber and the hot-melt fiber into a mixer in a ratio of 1:1 and mix them. The mixer speed is 500-1000 rpm and the mixing time is 15-30 minutes, so that the wormwood fiber and the hot-melt fiber can be fully mixed and evenly mixed; the mixed fibers are laid by air-laid method, and the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow to form a fiber web. The thickness of the fiber layer is 0.1mm-0.5mm; S2. Preparation of the middle anti-moisture regain layer: 0.8D-2D ES fibers are selected and put into a fiber scattering machine for scattering, and then the ES fibers are blown onto a forming net by a high-speed airflow to form a fiber layer with a thickness of 0.2mm-0.4mm; S3, preparation of the bottom breathable layer: wood pulp fiber and hot melt fiber are mixed in a ratio of 30%:70% and put into a mixer, the mixer speed is 800-1000 rpm, the mixing time is 20-30 minutes, so that the two fibers are fully mixed; the mixed fibers are evenly blown onto the mesh curtain by high-speed airflow using an air-laid method to form a fiber web, and the fiber layer thickness is 0.15mm-0.4mm; S4. Preparation of three-layer fiber web by thermal bonding: preheat the laid three-layer fiber web, the preheating temperature of the antibacterial and antibacterial layer is 100-130℃, the time is 6-10 minutes, the preheating temperature of the anti-regain layer is 120-140℃, the time is 5-9 minutes, the preheating temperature of the breathable layer is 100-130℃, the time is 5-7 minutes; after preheating, the three-layer fiber web is stacked in sequence and put into the hot pressing equipment for hot pressing reinforcement, the hot pressing temperature is 120-160℃, the hot pressing pressure is 1-3MPa, and the hot pressing time is 10-30s; after hot pressing, the dry papermaking nonwoven fabric is taken out and placed in a well-ventilated environment for natural cooling. After cooling and shaping, the production is completed.

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