Preparation method of composite fiber non-woven fabric

Abstract

The invention relates to a preparation method of a composite fiber non-woven fabric, which comprises the following steps: step 1, firstly grinding viscose fibers, cellulose acetate fibers, polyester fibers, polypropylene fibers, polyamide fibers, metal fibers, carbon fibers, high-crimp fibers and antistatic fibers into powder; stirring the powder, epoxy resin, butadiene styrene rubber and a small amount of water in a stirrer for 10-15 minutes to obtain a fiber solution; 2, metal fibers, carbon fibers, high-crimp fibers and anti-static fibers are interspersed and mixed into conventional raw materials, according to the characteristic that the saturation force of the fibers is low, the surfaces of the non-woven fabrics are evenly coated with the hot melt adhesive through a coating machine or a spraying machine, then the two non-woven fabrics are pressed together through a hot press, and the non-woven fabrics are manufactured. The hot melt coating generally can provide higher bonding strength and consistency, the composite fiber non-woven fabric is prevented from being easily broken or torn, and the two non-woven fabrics are pressed together by a hot press to avoid the conditions of unevenness, uneven surfaces and the like.

Description

Technical Field

[0001] The invention relates to the technical field of composite fiber nonwoven fabrics, in particular to a method for preparing composite fiber nonwoven fabrics. Background Art

[0002] Composite fiber is a kind of multi-component fiber, which is a term for artificial fiber varieties. There are two or more unmixed polymer fibers on the same fiber cross section. This kind of fiber is called composite fiber. The composite fiber manufacturing technology can obtain two-component fiber with two polymer characteristics. There are parallel type, skin-core type, island type and other composite fibers. The fiber cross section is round and special-shaped. The fiber has three-dimensional curling, high fluffiness and coverage, good conductivity, antistatic and flame retardancy.

[0003] In the prior art, a composite fiber non-woven fabric and a preparation method thereof with patent number CN114576942B are disclosed, comprising a non-woven fabric main body; a composite fiber structure is arranged on the outside of the non-woven fabric main body, the composite fiber structure comprises a vinylon moisture absorption layer, a silver fiber antibacterial layer and a nylon wear-resistant layer, the vinylon moisture absorption layer is fixedly connected to the top of the non-woven fabric main body, the silver fiber antibacterial layer is fixedly connected to one end of the vinylon moisture absorption layer away from the non-woven fabric main body, the nylon wear-resistant layer is fixedly connected to one end of the silver fiber antibacterial layer away from the vinylon moisture absorption layer, the vinylon moisture absorption layer plays the role of enhancing the fiber strength of the non-woven fabric as a whole and the hygroscopicity of the non-woven fabric as a whole, the silver fiber antibacterial layer plays the role of enhancing the antistatic ability and antibacterial property of the non-woven fabric as a whole, and the nylon wear-resistant layer plays the role of enhancing the wear resistance of the outer side of the non-woven fabric as a whole.

[0004] The existing composite fiber non-woven fabrics have low fiber saturation force. Currently, needle-punched non-woven fabrics are used. The strength of some needle-punched non-woven fabrics may not be high enough. The composite fiber non-woven fabrics are easy to break or tear. Needle-punched non-woven fabrics are prone to burrs during the production process, which will affect the appearance and quality of the composite fiber non-woven fabrics. Due to improper production equipment or operation, some needle-punched non-woven fabrics may appear uneven, such as uneven surfaces. For this reason, we propose a preparation method for composite fiber non-woven fabrics. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a composite fiber non-woven fabric to solve the problem mentioned in the above background technology that the existing betel nut chewing gum mostly uses white sugar as the main sweetener, which has no effect on ordinary people, but for patients with high blood sugar, consuming a large amount of white sugar products at one time is fatal.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing a composite fiber nonwoven fabric, comprising the following steps:

[0007] Step 1, firstly grind viscose fiber, acetate fiber, polyester fiber, polypropylene fiber, polyamide fiber, metal fiber, carbon fiber, high crimp fiber, antistatic fiber into powder, then put the powder, epoxy resin, styrene-butadiene rubber and a small amount of water in a blender and stir for 10-15 minutes to obtain a fiber solution;

[0008] Step 2: metal fibers, carbon fibers, high-curl fibers, and antistatic fibers are interspersed and mixed into conventional raw materials, which is conducive to the fusion of natural fibers such as cotton, linen, wool, and silk. The metal fibers, carbon fibers, and high-curl fibers can be fused and wrapped around the outside of the natural fibers through a hot press;

[0009] Step 3, after the first microwave drying, the second microwave drying, and the third microwave drying, all of which are zoned step drying, the drying step temperatures are 98-102°C, 108-112°C, 118-122°C, and 128-132°C, respectively, the two non-woven fabrics are squeezed together by ultrasonic vibration, thereby generating friction and heat, and the two non-woven fabrics are fused together, and the bonding method does not require the use of glue or other adhesives, so it is pollution-free and environmentally friendly;

[0010] Step 4: In combination with the spunlace nonwoven fabric preparation method, a high-pressure fine water stream is sprayed onto one or more layers of the fiber web to entangle the fibers with each other, thereby reinforcing the fiber web and providing a certain strength;

[0011] Step 5, imitate the air-laid non-woven fabric, which can also be called dust-free paper and dry papermaking non-woven fabric. It uses air-laid technology to open the wood pulp fiberboard into a single fiber state, and then uses air flow to condense the fibers on the mesh curtain, and the fiber web is reinforced into cloth;

[0012] Step 6: Open the fiber material placed in the water medium into single fibers, and mix different fiber materials to make fiber suspension slurry. The suspension slurry is transported to a web-forming organization, and the fibers are formed into a web in a wet state and then reinforced into a cloth.

[0013] Step 7, the pre-wetted fiber web enters the spunlace area, and the water jet holes of the spunlace head spray multiple fine water jets vertically toward the fiber web. The water jets cause a portion of the surface fibers in the fiber web to displace, including vertical movement toward the back of the fiber web. When the water jets penetrate the fiber web, they are rebounded by the web-supporting curtain or the drum and scattered to the back of the fiber web in different directions. Under the dual effects of the direct impact of the water jets and the rebounding water flow, the fibers in the fiber web are displaced, interlaced, entangled, and embraced, forming countless flexible entanglement points, thereby reinforcing the fiber web without the need for pre-needling needles for preparation;

[0014] Step 8, in the process of meltblown nonwoven fabric: polymer feeding---melt extrusion---fiber formation---fiber cooling---netting---reinforcement into fabric;

[0015] Step 9: The non-woven fabric solution is centrifuged, dried, and ground to form powder, and then the powder is added to a melt spinning machine for spinning, and then the finished non-woven fabric is obtained after drawing, web forming, and hot rolling.

[0016] Preferably, in step 2, the hot melt adhesive is evenly coated on the surface of the non-woven fabric by a coater or a sprayer, and then the two non-woven fabrics are pressed together using a hot press. Hot melt coating can usually provide higher bonding strength and consistency.

[0017] Preferably, in step 3, hot air drying is often used for back-end drying. For example, in order to dry or consolidate the strength, low-melting-point fibers are added to the material system to achieve thermal bonding. The hot air drying design can be operated in continuous or grouped modes, used alone or in combination with a drying cylinder, with a maximum temperature of 250°C. According to the use of materials, the process is optimized and improved, and natural and synthetic polymer fibers and inorganic fibers, aramid, carbon fiber, glass fiber and basalt fiber are bonded to composite fiber-free materials and synthetic fibers.

[0018] Preferably, the purpose of the dehydration is to promptly remove the retained water in the fiber web so as not to affect the entanglement effect during the next hydroentanglement. When the amount of retained water in the fiber web is large, it will cause the dispersion of the water jet energy, which is not conducive to fiber entanglement. After the hydroentanglement process is completed, the moisture in the fiber web is reduced to a minimum, which is beneficial to reduce the energy consumption of drying.

[0019] Preferably, in step 4, a plurality of fine water jets generated by high pressure, i.e., a hydroentanglement machine, are used to spray the fiber web. After the water jets pass through the fiber web, they are rebounded by the supporting net curtain and penetrate the fiber web again. As a result, the fibers in the fiber web are displaced, interlaced, entangled and cohesive under the hydraulic action of the high-speed water jets in different directions, thereby strengthening the fiber web.

[0020] Preferably, the mesh fiber structure determines the strength of the composite fiber non-woven fabric, increases the high hygroscopicity and quick wetting properties of the composite fiber non-woven fabric, and the composite fiber non-woven fabric will not pill under normal use. The composite fiber non-woven fabric is washable and not prone to mildew.

[0021] Preferably, in step 7, the vertical injection of water jets onto the fiber web can prevent damage to the fiber web structure and maximize the use of the energy of the water jets, thereby facilitating the improvement of the performance of the hydroentangled nonwoven material. The hydroentanglement reinforcement methods mainly include flat net hydroentanglement reinforcement, rotary drum hydroentanglement reinforcement, and hydroentanglement reinforcement combining rotary drum and flat net.

[0022] In the present invention, a spunlace nonwoven fabric preparation method and a pulp air-laid nonwoven fabric preparation method are used to replace the needling of composite fiber nonwoven fabric, so as to avoid uneven needle tension affecting the needling effect and prevent the uneven appearance of the fabric surface. The water jet holes of the water jet plate of the spunlace head spray multiple fine water jets, which are vertically sprayed toward the fiber web. The water jets cause a part of the surface fibers in the fiber web to be displaced, including vertical movement to the reverse side of the fiber web. When the water jets penetrate the fiber web, they are rebounded by the support net curtain or the drum and scattered to the reverse side of the fiber web in different directions. The water jet holes of the water jet plate of the spunlace head spray multiple fine water jets, which are vertically sprayed toward the fiber web. The water jets cause a part of the surface fibers in the fiber web to be displaced, including vertical movement to the reverse side of the fiber web. When the water jets penetrate the fiber web, they are rebounded by the support net curtain or the drum and scattered to the reverse side of the fiber web in different directions. The hot melt adhesive is evenly coated on the surface of the nonwoven fabric by a coating machine or a spraying machine.

[0023] According to the low saturation force of the fiber, the hot melt adhesive is evenly coated on the surface of the non-woven fabric through a coater or sprayer, and then the two non-woven fabrics are pressed together using a hot press. Hot melt coating can usually provide higher bonding strength and consistency to prevent the composite fiber non-woven fabric from easily breaking or tearing. The hot press presses the two non-woven fabrics together to avoid unevenness and uneven surfaces. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention provides a technical solution: a method for preparing a composite fiber nonwoven fabric, comprising the following steps:

[0026] Step 1, firstly grind viscose fiber, acetate fiber, polyester fiber, polypropylene fiber, polyamide fiber, metal fiber, carbon fiber, high crimp fiber, antistatic fiber into powder, then put the powder, epoxy resin, styrene-butadiene rubber and a small amount of water in a blender and stir for 10-15 minutes to obtain a fiber solution;

[0027] Step 2: metal fibers, carbon fibers, high-curl fibers, and antistatic fibers are interspersed and mixed into conventional raw materials, which is conducive to the fusion of natural fibers such as cotton, linen, wool, and silk. The metal fibers, carbon fibers, and high-curl fibers can be fused and wrapped around the outside of the natural fibers through a hot press;

[0028] Step 3, after the first microwave drying, the second microwave drying, and the third microwave drying, all of which are zoned step drying, the drying step temperatures are 98-102°C, 108-112°C, 118-122°C, and 128-132°C, respectively, the two non-woven fabrics are squeezed together by ultrasonic vibration, thereby generating friction and heat, and the two non-woven fabrics are fused together, and the bonding method does not require the use of glue or other adhesives, so it is pollution-free and environmentally friendly;

[0029] Step 4: In combination with the spunlace nonwoven fabric preparation method, a high-pressure fine water stream is sprayed onto one or more layers of the fiber web to entangle the fibers with each other, thereby reinforcing the fiber web and providing a certain strength;

[0030] Step 5, air-laid non-woven fabric can also be called dust-free paper or dry papermaking non-woven fabric. 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 mesh curtain, and the fiber mesh is then reinforced into cloth;

[0031] Step 6: Open the fiber material placed in the water medium into single fibers, and mix different fiber materials to make fiber suspension slurry. The suspension slurry is transported to a web-forming organization, and the fibers are formed into a web in a wet state and then reinforced into a cloth.

[0032] Step 7, the pre-wetted fiber web enters the spunlace area, and the water jet holes of the spunlace head spray multiple fine water jets vertically toward the fiber web. The water jets cause a portion of the surface fibers in the fiber web to displace, including vertical movement toward the back of the fiber web. When the water jets penetrate the fiber web, they are rebounded by the web-supporting curtain or the drum and scattered to the back of the fiber web in different directions. Under the dual effects of the direct impact of the water jets and the rebounding water flow, the fibers in the fiber web are displaced, interlaced, entangled, and embraced, forming countless flexible entanglement points, thereby reinforcing the fiber web without the need for pre-needling needles for preparation;

[0033] Step 8, melt-blown non-woven fabric melt-blown non-woven fabric process: polymer feeding --- melt extrusion --- fiber formation --- fiber cooling --- web formation --- reinforcement into fabric;

[0034] Step 9: The non-woven fabric solution is centrifuged, dried, and ground to form powder, and then the powder is added to a melt spinning machine for spinning, and then the finished non-woven fabric is obtained after drawing, web forming, and hot rolling.

[0035] The preparation method of the composite fiber non-woven fabric comprises the following steps: grinding viscose fiber, acetate fiber, polyester fiber, polypropylene fiber, polyamide fiber, metal fiber, carbon fiber, high-curl fiber and antistatic fiber into powder, uniformly coating the powder on the surface of the non-woven fabric through a coater or a sprayer with hot melt adhesive, and then pressing two non-woven fabrics together using a hot press. Hot melt coating can usually provide higher bonding strength and consistency. The preparation method of the spunlace non-woven fabric and the preparation method of the pulp air-laid non-woven fabric can replace the acupuncture of the composite fiber non-woven fabric, thereby avoiding uneven tension of the needles that will affect the acupuncture effect and preventing the appearance of the fabric from being uneven. The water jet holes of the water jet plate of the spunlace head spray multiple fine water jets, which are vertically sprayed toward the fiber web, and the water jets make the fiber web A part of the surface fibers in the web is displaced, including vertical movement to the back of the web. When the water jet penetrates the web, it is rebounded by the web curtain or the drum and scattered to the back of the web in different directions. The water jet holes of the water jet plate of the spurting head spray out multiple fine water jets. After the first microwave drying, the second microwave drying and the third microwave drying are all zoned step drying, and the drying step temperatures are 98-102°C, 108-112°C, 118-122°C, and 128-132°C respectively. The two non-woven fabrics are squeezed together by ultrasonic vibration, thereby generating friction and heat to fuse the two non-woven fabrics together. The bonding method does not require the use of glue or other adhesives, so it is pollution-free and environmentally friendly.

Claims

1. A method for preparing a composite fiber nonwoven fabric, characterized in that: The following steps are involved: Step (1), firstly grinding viscose fiber, acetate fiber, polyester fiber, polypropylene fiber, polyamide fiber, metal fiber, carbon fiber, high crimp fiber, antistatic fiber into powder, then placing the powder, epoxy resin, styrene-butadiene rubber and a small amount of water in a blender and stirring for 10-15 minutes to obtain a fiber solution; Step (2), interweaving and mixing metal fibers, carbon fibers, high-curl fibers, and antistatic fibers into conventional raw materials, which is conducive to the fusion of natural fibers such as cotton, linen, wool, and silk, and the metal fibers, carbon fibers, and high-curl fibers can be fused and wrapped around the outside of the natural fibers through a hot press; Step (3), after the first microwave drying, the second microwave drying, and the third microwave drying, all of which are zoned step drying, the drying step temperatures are 98-102°C, 108-112°C, 118-122°C, and 128-132°C, respectively, the two non-woven fabrics are squeezed together by ultrasonic vibration, thereby generating friction and heat, and the two non-woven fabrics are fused together. The bonding method does not require the use of glue or other adhesives, so it is pollution-free and environmentally friendly; Step (4), in combination with the spunlace nonwoven fabric preparation method, spraying a high-pressure fine water stream onto one or more layers of the fiber web to entangle the fibers with each other, thereby reinforcing the fiber web and providing a certain strength; Step (5), Pulp air-laid non-woven fabric Air-laid non-woven fabric can also be called dust-free paper or dry papermaking non-woven fabric. It uses air-laid technology to loosen the wood pulp fiberboard into a single fiber state, and then uses air flow to condense the fibers on the web curtain, and the fiber web is then reinforced into cloth; Step (6), opening the fiber material placed in the water medium into single fibers, and mixing different fiber materials to form a fiber suspension slurry, and transporting the suspension slurry to a web-forming organization, and the fibers are formed into a web in a wet state and then reinforced into a cloth; Step (7), the pre-wetted fiber web enters the spunlace area, and the water jet holes of the spunlace head spray multiple fine water jets vertically toward the fiber web. The water jets cause a portion of the surface fibers in the fiber web to displace, including vertical movement toward the back of the fiber web. When the water jets penetrate the fiber web, they are rebounded by the web-supporting curtain or the drum and scattered to the back of the fiber web in different directions. Under the dual effects of the direct impact of the water jets and the rebounding water flow, the fibers in the fiber web are displaced, interlaced, entangled, and embraced, forming countless flexible entanglement points, thereby reinforcing the fiber web without the need for pre-needling needles for preparation; Step (8), process of meltblown nonwoven fabric: polymer feeding --- melt extrusion --- fiber formation --- fiber cooling --- web formation --- reinforcement into fabric; Step (9), the non-woven fabric solution is centrifuged, dried, and ground to form powder, and then the powder is added to a melt spinning machine for spinning, and then the finished non-woven fabric is obtained after drawing, web forming, and hot rolling.

2. The method for preparing a composite fiber nonwoven fabric according to claim 1, characterized in that: In the step (2), the hot melt adhesive is evenly coated on the surface of the non-woven fabric by a coater or a sprayer, and then the two non-woven fabrics are pressed together using a hot press. Hot melt coating can usually provide higher bonding strength and consistency.

3. The method for preparing a composite fiber nonwoven fabric according to claim 1, characterized in that: In step (3), hot air drying is often used for drying at the back end, for example, to dry or consolidate the strength, add low melting point fibers to the material system to achieve thermal bonding. The design of hot air drying can be continuous or group operation mode, used alone or in combination with drying cylinders, with a maximum temperature of 250°C. According to the use of materials, the process is optimized and improved, and natural and synthetic polymer fibers and inorganic fibers, aramid, carbon fiber, glass fiber and basalt fiber are bonded, and used to composite fiber-free materials and synthetic fibers.

4. The method for preparing a composite fiber nonwoven fabric according to claim 3, characterized in that: The purpose of dehydration is to remove the retained water in the fiber web in time to avoid affecting the entanglement effect during the next hydroentanglement. When there is a lot of retained water in the fiber web, it will cause the water jet energy to disperse, which is not conducive to fiber entanglement. After the hydroentanglement process, the moisture in the fiber web is reduced to the minimum, which is conducive to reducing the energy consumption of drying.

5. The method for preparing a composite fiber nonwoven fabric according to claim 1, characterized in that: In step (4), a plurality of fine water jets generated by high pressure, i.e., a hydroentanglement machine, are used to spray the fiber web. After the water jets pass through the fiber web, they are rebounded by the supporting net curtain and penetrate the fiber web again. As a result, the fibers in the fiber web are displaced, interlaced, entangled and embraced under the hydraulic action of the high-speed water jets in different directions, thereby strengthening the fiber web.

6. The method for preparing a composite fiber nonwoven fabric according to claim 5, characterized in that: The mesh fiber structure determines the strength of the composite fiber non-woven fabric, increases the high hygroscopicity and quick wetting properties of the composite fiber non-woven fabric, and the composite fiber non-woven fabric will not pill under normal use. The composite fiber non-woven fabric is washable and not prone to mildew.

7. The method for preparing a composite fiber nonwoven fabric according to claim 1, characterized in that: In the step (7), the vertical injection of water jets onto the fiber web can prevent the fiber web structure from being damaged and maximize the use of the energy of the water jets, thereby facilitating the improvement of the performance of the hydroentangled nonwoven material. The hydroentanglement reinforcement methods mainly include flat mesh hydroentanglement reinforcement, rotary drum hydroentanglement reinforcement, and hydroentanglement reinforcement combining rotary drum and flat mesh.