Preparation method of soft non-woven fabric

Abstract

The invention relates to the technical field of preparation of soft non-woven fabrics, and discloses a preparation method of a soft non-woven fabric, which comprises the following steps: selecting proper non-woven fabric raw materials, determining the ratio of the raw materials according to product requirements, feeding the prepared raw materials into a melt extruder, heating to above the melting point of the raw materials, melting the raw materials into a liquid raw material, and extruding the liquid raw material through a spinneret plate to obtain the soft non-woven fabric. According to the method, continuous fibers are formed, the extruded fibers pass through a cooling device, are rapidly cooled and are solidified into solid fibers, and the cooled fibers are stretched through a stretching device, so that the length and the fineness of the fibers are increased. According to the non-woven fabric, soft fiber raw materials are selected, fibers are treated through pulping and carding processes, a softening agent is added in the preparation process of the non-woven fabric, a layer of lubricating film is formed on the surfaces of the fibers, friction force among the fibers is reduced, and the non-woven fabric is prepared by adjusting the structure of the non-woven fabric, increasing interweaving points of the fibers and changing the arrangement mode of the fibers. Therefore, the softness of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of soft non-woven fabric preparation, in particular to a method for preparing soft non-woven fabric. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is a fabric that does not require spinning and weaving processes. It is made by directional or random arrangement of textile staple fibers or filaments to form a fiber web structure, and then reinforced by mechanical, thermal bonding or chemical methods. Non-woven fabric has broken through the traditional textile principle and has unique properties and a wide range of applications. Soft non-woven fabric is a non-woven fabric made of directional or randomly arranged fibers bonded by physical or chemical methods. It retains the original properties of the fiber, such as softness, breathability and moisture absorption, and has good strength, toughness and durability. With the improvement of people's living standards and the change of consumption concepts, the demand for soft, comfortable, environmentally friendly and healthy products is increasing. As a new type of environmentally friendly material, soft non-woven fabric has broad market prospects. In the future, with the continuous advancement of production technology and the reduction of costs, soft non-woven fabrics will be applied and promoted in more fields.

[0003] As people's lives continue to change, the use of soft non-woven fabrics has become more and more common, which has made the production of soft non-woven fabrics more and more common. However, the soft non-woven fabrics produced by traditional production methods are less soft, so a new preparation method is now proposed to solve this technical problem. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a method for preparing a soft non-woven fabric, which has the advantages of increasing softness, etc., and solves the problem of low softness caused by the traditional preparation method mentioned in the above background technology.

[0006] (2) Technical solution

[0007] In order to achieve the purpose of improving softness mentioned in the above background technology, the present invention provides the following technical solution: a method for preparing a soft non-woven fabric, comprising the following steps:

[0008] Step 1: Select suitable non-woven fabric raw materials and determine the ratio of raw materials according to product requirements;

[0009] Step 2: Feed the prepared raw materials into a melt extruder, heat them above the melting point of the raw materials, melt them into liquid, and extrude the liquid raw materials through a spinneret to form continuous fiber filaments;

[0010] Step 3: The extruded fiber filaments pass through a cooling device to be rapidly cooled and solidified into solid fibers;

[0011] Step 4: The cooled fiber filaments are stretched through a stretching device to increase the length and fineness of the fiber;

[0012] Step 5: The stretched fiber filaments are evenly laid on the web curtain through a web laying device to form a multi-layer web;

[0013] Step 6: Soften the reinforced non-woven fabric;

[0014] Step 7: The treated non-woven fabric is wound into a roll by a winding device and cut, and then the cut non-woven fabric is subjected to quality inspection.

[0015] Preferably, the suitable non-woven fabric raw materials are selected, and the ratio of the raw materials is determined according to the product requirements. The raw materials are selected first, and then the quality of all raw materials is ensured to meet the production requirements, and the use of raw materials containing impurities, excessive moisture or unstable performance is avoided. The ratio of raw materials is determined according to the requirements, and the ratio principle follows softness, strength, air permeability and cost.

[0016] Softness: Increasing the amount of softener can improve the softness of non-woven fabrics, but excessive addition may affect the strength and breathability of non-woven fabrics;

[0017] Strength: Increasing the amount of tackifier and plasticizer can improve the strength of non-woven fabrics, but excessive addition may affect the softness of non-woven fabrics;

[0018] Breathability: The ratio of raw materials will also affect the breathability of non-woven fabrics. The finer the fiber diameter, the better the breathability of the non-woven fabric. However, too fine fibers may affect the strength and processing performance of the non-woven fabric.

[0019] Cost: Under the premise of meeting product performance requirements, reasonably control raw material costs and select cost-effective raw material ratio solutions;

[0020] Accurate weighing: Use electronic scales and other precision instruments to accurately weigh various raw materials according to the required ratio;

[0021] Mix evenly: put the weighed raw materials into the blender and mix them thoroughly to ensure that all the raw materials are evenly distributed;

[0022] Subsequent processing: The raw materials after uniform mixing can undergo subsequent processing steps such as melt extrusion, spinning cooling, stretching and thinning, fiber web formation and reinforcement, and finally made into soft non-woven fabrics.

[0023] Preferably, the prepared raw materials are fed into a melt extruder, heated to above the melting point of the raw materials, melted into liquid, and the liquid raw materials are extruded through a spinneret to form continuous fiber filaments. The process can be divided into three parts: melt extrusion, spinneret extrusion, and subsequent processing.

[0024] Melt extrusion: The prepared raw materials are fed into the melt extruder, which heats the raw materials to above the melting point through a heating device, melting them into a liquid state. The heating temperature is usually determined according to the melting point of the raw materials. In the melt extruder, the raw materials are continuously moved forward under the push of the screw, and are simultaneously subjected to shearing and mixing to ensure that the raw materials are fully melted and evenly mixed;

[0025] Spinneret extrusion: The spinneret is an important component of the melt extruder, on which there are many tiny spinneret holes. The shape, size and distribution density of these spinneret holes have an important influence on the formation and performance of the fiber filaments. Under the action of pressure, the liquid raw material is extruded through the spinneret holes on the spinneret to form continuous fiber filaments. The diameter and shape of the fiber filaments depend on the diameter and shape of the spinneret holes, as well as the extrusion speed and pressure. After leaving the spinneret, the extruded fiber filaments quickly cool and solidify.

[0026] Preferably, in the process of preparing the soft non-woven fabric, the extruded fiber filaments need to be quickly cooled and solidified into solid fibers by a cooling device. The cooling methods are divided into air cooling and water cooling, and the cooling parameters are controlled, and then the cooled raw materials are subsequently processed.

[0027] Air cooling: Air cooling is a simple and commonly used cooling method. By adjusting parameters such as the temperature, flow rate, and humidity of the cooling air, the cooling speed and curing effect of the fiber filament can be controlled. Air cooling is suitable for the cooling needs of most fiber filaments, but for some special fiber filaments, a more efficient cooling method may be required.

[0028] Water cooling: Water cooling is a more efficient cooling method that can quickly reduce the temperature of the fiber and achieve rapid solidification;

[0029] The cooling parameters are divided into the temperature of the cooling air: the temperature of the cooling air should be lower than the melting point of the fiber to ensure that the fiber can be cooled quickly. The lower the temperature of the cooling air, the faster the fiber cools down. However, too low a temperature may cause cracks or breakage on the surface of the fiber.

[0030] Cooling air flow rate: The higher the flow rate, the faster the fiber filaments cool down. Too high a flow rate may increase the frictional resistance between the fiber filaments and the cooling air, causing the fiber filaments to break or deform.

[0031] Humidity of cooling air: Appropriate humidity helps the fiber filaments cool and solidify, but too high humidity may cause water mist or condensation on the fiber surface;

[0032] Water temperature and water flow in water cooling: For water cooling, the water temperature should be lower than the melting point of the fiber to ensure that the fiber can be cooled quickly. The water flow rate should be adjusted according to the diameter of the fiber and the cooling rate to ensure that the fiber can be evenly cooled and solidified.

[0033] Preferably, the cooled fiber filaments are stretched by a stretching device to increase the length and fineness of the fibers. The stretching is divided into mechanical stretching and air flow stretching, and the stretching parameters are controlled during the stretching process.

[0034] Mechanical stretching device: uses mechanical force to stretch the fiber filaments. This device usually includes one or more pairs of stretching rods. The fiber filaments are subjected to the stretching force when passing between the stretching rods, thereby achieving the stretching effect.

[0035] Airflow stretching device: uses high-speed airflow to stretch the fiber filaments. This device usually includes one or more air nozzles, which spray high-speed airflow to subject the fiber filaments to stretching force in the airflow;

[0036] The stretching parameters include: stretching ratio: the stretching ratio refers to the ratio of the length of the fiber after stretching to the original length. The greater the stretching ratio, the greater the increase in the length and fineness of the fiber;

[0037] Drawing speed: Too fast a drawing speed may cause fiber breakage or produce uneven drawing effects, while too slow a drawing speed may reduce production efficiency. The appropriate drawing speed needs to be determined based on the material properties of the fiber and the performance of the production equipment;

[0038] Stretching temperature: If the stretching temperature is too high, the fiber may soften or even melt, affecting the stretching effect. If the stretching temperature is too low, the risk of fiber breakage may increase. The appropriate stretching temperature needs to be determined based on the material properties of the fiber and product requirements.

[0039] Preferably, the stretched fiber filaments are evenly laid on the web curtain through a web laying device to form a multi-layer fiber web. The web laying process is divided into fiber filament laying, multi-layer fiber web formation, and fiber web uniformity control. A parallel web laying device, an interlaced web laying device, and an airflow web forming device are required for web laying, and the fiber web is reinforced, post-finished, wound, and cut after the web laying is completed.

[0040] Fiber laying: When the stretched fiber filaments pass through the laying device, they are evenly dispersed and laid on the net curtain. The design of the laying device should ensure that the fiber filaments can be laid according to the predetermined trajectory and density to avoid fiber accumulation or uneven sparseness;

[0041] Multi-layer web formation: The laying device can continuously lay multiple layers of fiber filaments on the web curtain to form a multi-layer web. The number of web layers, the thickness and uniformity of each layer of fiber filaments can be controlled by adjusting the working parameters of the laying device;

[0042] Web uniformity control: To ensure the uniformity of the web, the web laying device is usually equipped with an adjustment device to accurately control the laying speed and density of the fiber filaments;

[0043] Parallel laying device: The parallel laying device lays the fiber filaments parallel to the mesh curtain to form a longitudinally arranged fiber web;

[0044] Interlaced laying device: The interlaced laying device lays the fiber filaments on the mesh curtain in an interlaced manner to form a fiber web that is interlaced horizontally and vertically;

[0045] Air-laid device: The air-laid device uses air flow to randomly lay fiber filaments on the mesh curtain to form a disordered fiber web.

[0046] Preferably, the softening treatment of the reinforced non-woven fabric can be divided into chemical softener treatment and mechanical softening finishing, and when performing the softening treatment, a suitable softener is selected, the treatment conditions are controlled, and the softening effect is evaluated.

[0047] Chemical softener treatment: Softener molecules can penetrate into the fibers of non-woven fabrics, reduce the friction between fibers, and make the fibers easier to bend and deform. Different softeners are suitable for different types of non-woven fabrics and different softness requirements. Choose the appropriate type and amount of softener based on the material properties of the non-woven fabric, the softness requirements, and the performance of the softener.

[0048] Mechanical softening finishing: Mechanical softening finishing is a method of improving the softness of non-woven fabrics through physical action. Common mechanical softening finishing methods include the Klapek method and the Michaelis method.

[0049] The Klapek method simulates the principle of pre-shrinking finishing on a Sanforite machine, kneading or compressing the non-woven fabric to reduce its rigidity and increase its softness.

[0050] The Michaelis law is to increase the softness and extensibility of non-woven fabrics by strongly squeezing the non-woven fabric to produce obvious wrinkles on its surface, increasing the unit area weight and surface area;

[0051] Choose the right softener: The choice of softener should be determined based on the material properties of the non-woven fabric, the softness requirements and the performance of the softener. At the same time, the cost, environmental protection and safety of the softener should also be considered.

[0052] Control treatment conditions: Control treatment conditions such as temperature, time, and concentration;

[0053] Evaluate softness: Evaluate the softness of nonwoven fabrics using both subjective and objective testing methods.

[0054] Preferably, the treated non-woven fabric is wound into a roll by a winding device and cut, and then the cut non-woven fabric is subjected to quality inspection, and the quality inspection content includes appearance quality, physical properties, chemical properties, and functionality.

[0055] Appearance quality: Check whether the surface of the non-woven fabric is flat, free of oil stains, stains, gaps, breaks and other defects. At the same time, check whether the texture of the non-woven fabric is clear and whether it feels soft;

[0056] Visual inspection is usually used, and the inspector should have certain experience and professional knowledge to accurately judge the appearance quality of non-woven fabrics;

[0057] Physical properties: including tensile strength, tear strength, elongation at break and other indicators, which reflect the mechanical properties and durability of non-woven fabrics;

[0058] Use professional testing instruments for testing, for example, use a tensile testing machine to measure the tensile strength and elongation at break of non-woven fabrics, and use a tear testing machine to measure the tear strength of non-woven fabrics;

[0059] Chemical properties: such as pH value, formaldehyde content, heavy metal content and other indicators. These indicators ensure that the non-woven fabric is harmless to the human body and meets environmental protection requirements;

[0060] Use professional testing instruments for testing, use a pH meter to measure the pH value of the non-woven fabric, and use a formaldehyde detector to measure the formaldehyde content in the non-woven fabric;

[0061] Functionality: According to the specific use of non-woven fabrics, functional tests such as air permeability, water absorption, waterproofness, and flame retardancy are carried out;

[0062] Select the appropriate test method according to the specific function, use the air permeability tester to measure the air permeability of the non-woven fabric, and use the combustion test equipment to evaluate the flame retardant performance of the non-woven fabric.

[0063] Compared with the prior art, the present invention provides a method for preparing a soft nonwoven fabric, which has the following characteristics:

[0064] Beneficial effects:

[0065] 1. The present invention selects soft fiber raw materials, processes the fibers through pulping and carding processes, and adds softener during the preparation of non-woven fabrics. A lubricating film can be formed on the fiber surface to reduce the friction between the fibers. By adjusting the structure of the non-woven fabric, the fiber interlacing points are increased and the fiber arrangement is changed, thereby improving the softness of the product.

[0066] 2. The present invention optimizes the process: by improving the preparation process, adopting an efficient laying device, optimizing the fiber stretching and airflow stretching parameters, improving production efficiency, reducing production costs, and adopting automated equipment such as an automatic winding device and automatic cutting equipment, continuous and automated production of non-woven fabrics is achieved, further improving production efficiency.

[0067] 3. This invention uses biodegradable materials, such as polypropylene, to produce nonwoven fabrics, which can reduce environmental pollution. Compared to the difficult-to-degrade materials used in traditional plastic bags, nonwoven fabrics offer significant environmental advantages. The use of environmentally friendly additives and processes during the production process reduces the emission of harmful substances, protecting the environment and human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0070] See also Figure 1 A method for preparing a soft non-woven fabric comprises the following steps:

[0071] Step 1: Select suitable non-woven fabric raw materials and determine the ratio of raw materials according to product requirements;

[0072] Step 2: Feed the prepared raw materials into a melt extruder, heat them above the melting point of the raw materials, melt them into liquid, and extrude the liquid raw materials through a spinneret to form continuous fiber filaments;

[0073] Step 3: The extruded fiber filaments pass through a cooling device to be rapidly cooled and solidified into solid fibers;

[0074] Step 4: The cooled fiber filaments are stretched through a stretching device to increase the length and fineness of the fiber;

[0075] Step 5: The stretched fiber filaments are evenly laid on the web curtain through a web laying device to form a multi-layer web;

[0076] Step 6: Soften the reinforced non-woven fabric;

[0077] Step 7: The treated non-woven fabric is wound into a roll by a winding device and cut, and then the cut non-woven fabric is subjected to quality inspection.

[0078] Specifically, such as Figure 1 As shown, the suitable non-woven fabric raw materials are selected, and the ratio of the raw materials is determined according to the product requirements. The raw materials are selected first, and then the quality of all raw materials is ensured to meet the production requirements. Raw materials containing impurities, excessive moisture or unstable performance are avoided. The ratio of raw materials is determined according to the requirements, and the ratio principle follows softness, strength, air permeability and cost.

[0079] Through the above technical solution, softness: Increasing the amount of softener can improve the softness of the non-woven fabric, but excessive addition may affect the strength and air permeability of the non-woven fabric;

[0080] Strength: Increasing the amount of tackifier and plasticizer can improve the strength of non-woven fabrics, but excessive addition may affect the softness of non-woven fabrics;

[0081] Breathability: The ratio of raw materials will also affect the breathability of non-woven fabrics. The finer the fiber diameter, the better the breathability of the non-woven fabric. However, too fine fibers may affect the strength and processing performance of the non-woven fabric.

[0082] Cost: Under the premise of meeting product performance requirements, reasonably control raw material costs and select cost-effective raw material ratio solutions;

[0083] Accurate weighing: Use electronic scales and other precision instruments to accurately weigh various raw materials according to the required ratio;

[0084] Mix evenly: put the weighed raw materials into the blender and mix them thoroughly to ensure that all the raw materials are evenly distributed;

[0085] Subsequent processing: The raw materials after uniform mixing can undergo subsequent processing steps such as melt extrusion, spinning cooling, stretching and thinning, fiber web formation and reinforcement, and finally made into soft non-woven fabrics.

[0086] Specifically, such as Figure 1 As shown, the prepared raw materials are fed into a melt extruder and heated to above the melting point of the raw materials to melt them into liquid. The liquid raw materials are extruded through a spinneret to form continuous fiber filaments. The process can be divided into three parts: melt extrusion, spinneret extrusion and subsequent processing.

[0087] Through the above technical solution, melt extrusion: the prepared raw materials are fed into the melt extruder, and the melt extruder heats the raw materials to above the melting point through a heating device to melt them into a liquid state. The heating temperature is usually determined according to the melting point of the raw materials. In the melt extruder, the raw materials are continuously moved forward under the push of the screw, and are simultaneously subjected to shearing and mixing effects to ensure that the raw materials are fully melted and evenly mixed;

[0088] Spinneret extrusion: The spinneret is an important component of the melt extruder, on which there are many tiny spinneret holes. The shape, size and distribution density of these spinneret holes have an important influence on the formation and performance of the fiber filaments. Under the action of pressure, the liquid raw material is extruded through the spinneret holes on the spinneret to form continuous fiber filaments. The diameter and shape of the fiber filaments depend on the diameter and shape of the spinneret holes, as well as the extrusion speed and pressure. After leaving the spinneret, the extruded fiber filaments quickly cool and solidify.

[0089] Specifically, such as Figure 1 As shown, in the process of preparing the soft non-woven fabric, the extruded fiber filaments need to be quickly cooled and solidified into solid fibers by a cooling device. The cooling methods are divided into air cooling and water cooling, and the cooling parameters are controlled. Then, the cooled raw materials are subjected to subsequent processing.

[0090] Through the above technical solution, air cooling: Air cooling is a simple and commonly used cooling method. By adjusting parameters such as the temperature, flow rate and humidity of the cooling air, the cooling speed and solidification effect of the fiber filaments can be controlled. Air cooling is suitable for the cooling needs of most fiber filaments, but for some special fiber filaments, a more efficient cooling method may be required;

[0091] Water cooling: Water cooling is a more efficient cooling method that can quickly reduce the temperature of the fiber and achieve rapid solidification;

[0092] The cooling parameters are divided into the temperature of the cooling air: the temperature of the cooling air should be lower than the melting point of the fiber to ensure that the fiber can be cooled quickly. The lower the temperature of the cooling air, the faster the fiber cools down. However, too low a temperature may cause cracks or breakage on the surface of the fiber.

[0093] Cooling air flow rate: The higher the flow rate, the faster the fiber filaments cool down. Too high a flow rate may increase the frictional resistance between the fiber filaments and the cooling air, causing the fiber filaments to break or deform.

[0094] Humidity of cooling air: Appropriate humidity helps the fiber filaments cool and solidify, but too high humidity may cause water mist or condensation on the fiber surface;

[0095] Water temperature and water flow in water cooling: For water cooling, the water temperature should be lower than the melting point of the fiber to ensure that the fiber can be cooled quickly. The water flow rate should be adjusted according to the diameter of the fiber and the cooling rate to ensure that the fiber can be evenly cooled and solidified.

[0096] Specifically, such as Figure 1 As shown, the cooled fiber filaments are stretched by a stretching device to increase the length and fineness of the fibers. The stretching is divided into mechanical stretching and air flow stretching, and the stretching parameters are controlled during the stretching process.

[0097] Through the above technical solution, the mechanical stretching device: uses mechanical force to stretch the fiber filaments. This device usually includes one or more pairs of stretching rods. The fiber filaments are subjected to the stretching force when passing between the stretching rods, thereby achieving the stretching effect;

[0098] Airflow stretching device: uses high-speed airflow to stretch the fiber filaments. This device usually includes one or more air nozzles, which spray high-speed airflow to subject the fiber filaments to stretching force in the airflow;

[0099] The stretching parameters include: stretching ratio: the stretching ratio refers to the ratio of the length of the fiber after stretching to the original length. The greater the stretching ratio, the greater the increase in the length and fineness of the fiber;

[0100] Drawing speed: Too fast a drawing speed may cause fiber breakage or produce uneven drawing effects, while too slow a drawing speed may reduce production efficiency. The appropriate drawing speed needs to be determined based on the material properties of the fiber and the performance of the production equipment;

[0101] Stretching temperature: If the stretching temperature is too high, the fiber may soften or even melt, affecting the stretching effect. If the stretching temperature is too low, the risk of fiber breakage may increase. The appropriate stretching temperature needs to be determined based on the material properties of the fiber and product requirements.

[0102] Specifically, such as Figure 1 As shown, the stretched fiber filaments are evenly laid on the web curtain through a web laying device to form a multi-layer fiber web. The web laying process is divided into fiber filament laying, multi-layer fiber web formation, and fiber web uniformity control. A parallel web laying device, a staggered web laying device, and an airflow web forming device are required for web laying. After the web laying is completed, the fiber web is reinforced, post-finished, wound, and cut.

[0103] Through the above technical solution, fiber filaments are laid: when the stretched fiber filaments pass through the laying device, they are evenly dispersed and laid on the net curtain. The design of the laying device should ensure that the fiber filaments can be laid according to the predetermined trajectory and density to avoid the accumulation or uneven sparseness of the fiber filaments;

[0104] Multi-layer web formation: The laying device can continuously lay multiple layers of fiber filaments on the web curtain to form a multi-layer web. The number of web layers, the thickness and uniformity of each layer of fiber filaments can be controlled by adjusting the working parameters of the laying device;

[0105] Web uniformity control: To ensure the uniformity of the web, the web laying device is usually equipped with an adjustment device to accurately control the laying speed and density of the fiber filaments;

[0106] Parallel laying device: The parallel laying device lays the fiber filaments parallel to the mesh curtain to form a longitudinally arranged fiber web;

[0107] Interlaced laying device: The interlaced laying device lays the fiber filaments on the mesh curtain in an interlaced manner to form a fiber web that is interlaced horizontally and vertically;

[0108] Air-laid device: The air-laid device uses air flow to randomly lay fiber filaments on the mesh curtain to form a disordered fiber web.

[0109] Specifically, such as Figure 1 As shown, the softening treatment of the reinforced non-woven fabric can be divided into chemical softener treatment and mechanical softening finishing, and when performing the softening treatment, a suitable softener is selected, the treatment conditions are controlled, and the softening effect is evaluated.

[0110] Through the above technical solution, chemical softener treatment: softener molecules can penetrate into the fibers of non-woven fabrics, reduce the friction between fibers, and make the fibers easier to bend and deform. Different softeners are suitable for different types of non-woven fabrics and different softness requirements. According to the material characteristics of the non-woven fabrics, softness requirements and the performance of the softener, the appropriate type and amount of softener should be selected;

[0111] Mechanical softening finishing: Mechanical softening finishing is a method of improving the softness of non-woven fabrics through physical action. Common mechanical softening finishing methods include the Klapek method and the Michaelis method.

[0112] The Klapek method simulates the principle of pre-shrinking finishing on a Sanforite machine, kneading or compressing the non-woven fabric to reduce its rigidity and increase its softness.

[0113] The Michaelis law is to increase the softness and extensibility of non-woven fabrics by strongly squeezing the non-woven fabric to produce obvious wrinkles on its surface, increasing the unit area weight and surface area;

[0114] Choose the right softener: The choice of softener should be determined based on the material properties of the non-woven fabric, the softness requirements and the performance of the softener. At the same time, the cost, environmental protection and safety of the softener should also be considered.

[0115] Control treatment conditions: Control treatment conditions such as temperature, time, and concentration;

[0116] Evaluate softness: Evaluate the softness of nonwoven fabrics using both subjective and objective testing methods.

[0117] Specifically, such as Figure 1 As shown, the treated non-woven fabric is wound into a roll by a winding device and cut, and then the cut non-woven fabric is subjected to quality inspection, and the quality inspection content includes appearance quality, physical properties, chemical properties, and functionality.

[0118] Through the above technical solution, appearance quality: check whether the surface of the non-woven fabric is flat, free of oil stains, stains, gaps, breaks and other defects. At the same time, check whether the texture of the non-woven fabric is clear and whether it feels soft;

[0119] Visual inspection is usually used, and the inspector should have certain experience and professional knowledge to accurately judge the appearance quality of non-woven fabrics;

[0120] Physical properties: including tensile strength, tear strength, elongation at break and other indicators, which reflect the mechanical properties and durability of non-woven fabrics;

[0121] Use professional testing instruments for testing, for example, use a tensile testing machine to measure the tensile strength and elongation at break of non-woven fabrics, and use a tear testing machine to measure the tear strength of non-woven fabrics;

[0122] Chemical properties: such as pH value, formaldehyde content, heavy metal content and other indicators. These indicators ensure that the non-woven fabric is harmless to the human body and meets environmental protection requirements;

[0123] Use professional testing instruments for testing, use a pH meter to measure the pH value of the non-woven fabric, and use a formaldehyde detector to measure the formaldehyde content in the non-woven fabric;

[0124] Functionality: According to the specific use of non-woven fabrics, functional tests such as air permeability, water absorption, waterproofness, and flame retardancy are carried out;

[0125] Select the appropriate test method according to the specific function, use the air permeability tester to measure the air permeability of the non-woven fabric, and use the combustion test equipment to evaluate the flame retardant performance of the non-woven fabric.

[0126] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a soft nonwoven fabric, characterized in that: The following steps are involved: Step 1: Select suitable non-woven fabric raw materials and determine the ratio of raw materials according to product requirements; Step 2: Feed the prepared raw materials into a melt extruder, heat them above the melting point of the raw materials, melt them into liquid, and extrude the liquid raw materials through a spinneret to form continuous fiber filaments; Step 3: The extruded fiber filaments pass through a cooling device to be rapidly cooled and solidified into solid fibers; Step 4: The cooled fiber filaments are stretched through a stretching device to increase the length and fineness of the fiber; Step 5: The stretched fiber filaments are evenly laid on the web curtain through a web laying device to form a multi-layer web; Step 6: Soften the reinforced non-woven fabric; Step 7: The treated non-woven fabric is wound into a roll by a winding device and cut, and then the cut non-woven fabric is subjected to quality inspection.

2. The method for preparing a soft nonwoven fabric according to claim 1, wherein: The above-mentioned process involves selecting suitable non-woven fabric raw materials and determining the ratio of raw materials according to product requirements. The raw materials are selected first, and then the quality of all raw materials is ensured to meet production requirements. Raw materials containing impurities, excessive moisture or unstable performance are avoided. The ratio of raw materials is determined according to requirements, and the ratio principle follows softness, strength, air permeability and cost.

3. The method for preparing a soft nonwoven fabric according to claim 1, wherein: The prepared raw materials are fed into a melt extruder and heated to above the melting point of the raw materials to melt them into liquid form. The liquid raw materials are extruded through a spinneret to form continuous fiber filaments. The process can be divided into three parts: melt extrusion, spinneret extrusion and subsequent processing.

4. The method for preparing a soft nonwoven fabric according to claim 1, wherein: In the process of preparing the soft non-woven fabric, the extruded fiber filaments need to be quickly cooled and solidified into solid fibers by a cooling device. The cooling methods are divided into air cooling and water cooling, and the cooling parameters are controlled. Then, the cooled raw materials are subjected to subsequent processing.

5. The method for preparing a soft nonwoven fabric according to claim 1, wherein: The cooled fiber filaments are stretched by a stretching device to increase the length and fineness of the fibers. The stretching is divided into mechanical stretching and air flow stretching, and the stretching parameters are controlled during the stretching process.

6. The method for preparing a soft nonwoven fabric according to claim 1, wherein: The stretched fiber filaments are evenly laid on the web curtain through a web laying device to form a multi-layer fiber web. The web laying process is divided into fiber filament laying, multi-layer fiber web formation, and fiber web uniformity control. A parallel web laying device, a staggered web laying device, and an airflow web laying device are required for web laying. After the web laying is completed, the fiber web is reinforced, post-finished, wound, and cut.

7. The method for preparing a soft nonwoven fabric according to claim 1, wherein: The softening treatment of the reinforced non-woven fabric can be divided into chemical softener treatment and mechanical softening finishing, and when performing the softening treatment, a suitable softener is selected, treatment conditions are controlled, and the softening effect is evaluated.

8. The method for preparing a soft nonwoven fabric according to claim 1, wherein: The treated non-woven fabric is wound into a roll by a winding device and cut, and then the cut non-woven fabric is subjected to quality inspection, and the quality inspection content includes appearance quality, physical properties, chemical properties, and functionality.

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