Method for producing a two-component bulky nonwoven fabric

Abstract

The application discloses a production method of double-component fluffy non-woven fabric, and relates to the technical field of non-woven fabric production. The fluffy non-woven fabric comprises a first fiber web layer and a second fiber web layer arranged in sequence from top to bottom along the thickness direction. The first fiber web layer is made of a plurality of fine denier double-component fiber filaments, and the second fiber web layer is made of a plurality of thick denier double-component fiber filaments. In the process of carding and hot air forming of the fine denier fiber filaments of the first fiber web layer, the skin layer is fused and bonded to enhance the strength of the fiber web, and the weak points of the fine fibers are offset. The fine denier double-component fiber filaments are mechanically inserted into the gaps between the thick denier double-component fibers to form three-dimensional anchoring, and strong interface bonding is realized in combination with hot air bonding. Compared with a hot rolling process composite compression structure, the through pores and fluffy performance of the first fiber web layer are reserved.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric production technology, specifically to a method for producing two-component fluffy nonwoven fabric. Background Technology

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or randomly arranged fibers. It features moisture resistance, breathability, flexibility, lightweight, non-flammability, easy decomposition, non-toxicity, non-irritation, rich colors, low price, and recyclability. It is often produced using polypropylene (PP) granules as raw material, through a continuous one-step process of high-temperature melting, spinning, laying, and hot-pressing.

[0003] While ordinary nonwoven fabrics already possess good physical and mechanical properties, and can achieve softness by adding softening masterbatches and elastomers to the raw materials, the products still lack a good sense of fluffiness. Furthermore, the addition of softening masterbatches affects production stability, and the price of softening masterbatches is much higher than other raw materials, significantly increasing production costs. The denier of the fibers that form nonwoven fabric has a great influence on the performance of nonwoven fabric. The smaller the denier, the smaller the fiber diameter, and the more delicate and smooth the nonwoven fabric feels. On the other hand, the larger the denier, the larger the fiber diameter, the more pores the nonwoven fabric has, which is conducive to air permeability and liquid absorption, and the more fluffy the nonwoven fabric is.

[0004] Low denier fibers (≤1.5 denier) can give products a delicate touch and smooth surface, but they have problems such as difficulty in combing and poor fiber web uniformity, which restricts their large-scale application. Conventional denier fibers (1.5~3.0 denier) can balance processability and basic performance, but they are difficult to meet the high-end market's demand for extreme bulkiness and efficient flowability at the same time. Nonwoven fabrics supported by fibers with a single component and a single fiber denier can hardly meet high performance requirements. Summary of the Invention

[0005] To address the technical deficiencies in the background technology, this invention proposes a method for producing two-component fluffy nonwoven fabric, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows: A method for producing a bicomponent fluffy nonwoven fabric, wherein the fluffy nonwoven fabric includes a first fiber web layer and a second fiber web layer arranged sequentially from top to bottom along the thickness direction, wherein the first fiber web layer is made of a plurality of fine denier bicomponent fiber filaments and the second fiber web layer is made of a plurality of coarse denier bicomponent fiber filaments; The fine denier bicomponent fiber filament includes a fine denier PET core layer and a fine denier COPET sheath layer; The coarse denier bicomponent fiber filament includes a coarse denier PET core layer and a coarse denier PE sheath layer; The production process includes the following steps; Step 1: Prepare the fine denier bicomponent fiber by drying and pretreating the fine denier core layer raw material and the fine denier sheath raw material and adding modifiers respectively. The fine denier sheath melt and the fine denier core layer melt are obtained by melting them separately. After filtering them separately, the fine denier sheath melt and the fine denier core layer melt enter the island-type composite spinning assembly and are extruded from the spinneret. Step 2: Prepare the coarse denier bicomponent fiber by drying and pretreating the coarse denier core layer raw material and the coarse denier sheath layer raw material, adding compatibilizers respectively, and then melting them through a twin-screw melt extrusion spinning machine to obtain coarse denier sheath layer melt and coarse denier core layer melt. The coarse denier sheath layer melt and coarse denier core layer melt are fed into the composite spinning assembly for distribution and are then extruded through a concentric core-sheath spinneret for composite processing. Step 3: Layered carding. The coarse denier bicomponent fibers are carded to form the second fiber web layer using a double doffer carding machine, and the fine denier bicomponent fibers are carded to form the first fiber web layer. The first and second fiber web layers are then stacked and laid out using a pneumatic web laying system to create negative pressure isolation. Step 4; Microporous puncture composite: Use a needle to puncture the stacked fiber mesh layer, with the needle puncture angle being 75°~85°. Step 5: Gradient hot air bonding, through hot air treatment to form a fusion layer with different interlayer temperatures, so that the fine denier COPET skin of the first fiber web layer melts to form bonding points; and softens the coarse denier PE skin and combines it with the melt interface of the fine denier layer; finally, it is quickly shaped by cold air treatment.

[0006] As an improvement to the above solution, step 1 specifically includes: Step 1.1: Raw material pretreatment: Add 0.8% carboxyl-terminated carbon nanotubes as modifier to the fine denier core layer raw material and perform vacuum drying at 120℃; add 0.2% polydimethylsiloxane as modifier to the fine denier skin layer raw material and perform forced air drying at 80℃. Step 1.2; Melting and Filtration: The fine denier core material is melted through a single-screw extruder at a melting temperature of 265°C and filtered through a 15μm precision filter; the fine denier skin material is melted through a single-screw extruder at a melting temperature of 245°C and filtered through a 10μm precision filter. Step 1.3; Composite spinning: The two melts enter the island-type composite spinning assembly, and the volume ratio of the sheath and core is controlled by the distributor. The melts are combined at a volume ratio of 3:7 by the distributor, extruded from the spinneret, and then quenched by blowing air and relaxed by steam to form the fine denier bicomponent fiber filament.

[0007] As an improvement to the above solution, step 2 specifically includes: Step 2.1: Raw material pretreatment, the coarse denier core layer raw material is vacuum dried at 120℃, and 2% maleic anhydride grafted POE compatibilizer is added to the coarse denier cortex raw material and then dried by forced air at 80℃. Step 2.2; Twin-screw co-extrusion melting, the twin-screw extruder is used for zoned melting, wherein the melting zone temperature of the coarse denier core material is 265℃ and the melting zone temperature of the coarse denier skin material is 200℃, and the viscosity ratio of the core melt and the skin melt is controlled to be ≤3:1; Step 2.3; Composite spinning: The two melts enter the concentric sheath-core spinneret, the box temperature is controlled at 264-266℃, the volume ratio of the sheath and core is controlled by the distributor, and the composite is made at a volume ratio of 3:7 by the distributor, extruded from the spinneret orifice, and slowly cooled and shaped by the double-layer ring blowing device to form the coarse denier bicomponent fiber filament.

[0008] As an improvement to the above scheme, in step 1.3, the rapid cooling is carried out using a gradient side-blowing rapid cooling method, which consists of a first air-cooling zone and a second air-cooling zone. The air temperature in the first air-cooling zone is 25°C, and the air temperature in the second air-cooling zone is 15°C.

[0009] As an improvement to the above solution, step 3 specifically includes: Step 3.1: Opening: Open the coarse denier bicomponent fiber and the fine denier bicomponent fiber separately; Step 3.2: After the coarse denier bicomponent fibers are opened, they are transferred to the lower doffer layer to form the second fiber web layer by carding with a cylinder at a speed of 750-850 rpm. Step 3.3: After the fine denier bicomponent fiber is opened by airflow, it is combed by a cylinder at a speed of 1150-1250 rpm and transferred to the upper doffer to form the first fiber web layer; Step 3.4: Lay the net, isolate it with negative pressure airflow, lay the second fiber net layer at a speed of 10m / min, and stack the first fiber net layer at a speed of 15m / min, keeping the gap between the first fiber net layer and the second fiber net layer at 2-3mm.

[0010] As an improvement to the above scheme, step 4 specifically includes: placing the stacked fiber web in the piercing device, and piercing the first fiber web layer and extending it into the pores of the second fiber web layer from top to bottom at a frequency of 500 to 600 times / minute; simultaneously applying an 8-10kV electrostatic field during piercing to orient the ends of the fine denier bicomponent fibers into the gaps between the coarse denier bicomponent fibers; wherein, the piercing depth is controlled to be 50% to 60% of the thickness of the second fiber web layer after penetrating the first fiber web layer.

[0011] As an improvement to the above scheme, step 5 specifically includes: Step 5.1: Stack the fiber web into the furnace. The double-layer fiber web after puncture is put into the hot air furnace under tension, where the tension value is 0.5-1.0 N / cm. Step 5.2; Upper layer hot air treatment: The first fiber web layer is treated with hot air at 160-170℃ on the upper layer of the stacked fiber web. Step 5.3; Lower layer hot air treatment: The second fiber web layer is treated with hot air at 120-130℃ in the lower layer of the stacked fiber web. Step 5.4; Cooling and shaping: Use cold air at a temperature of 20°C to cool and shape the stacked fiber web.

[0012] As an improvement to the above scheme, in the hot air treatment in step 5, hot air is used to perform hot air penetration treatment on the stacked fiber web, forming a melting temperature of 160°C in the upper space of the stacked fiber web and a melting temperature of 120°C in the lower space of the stacked fiber web.

[0013] As an improvement to the above scheme, the fluffy nonwoven fabric is subjected to hydrophilic post-treatment after the gradient hot air bonding step, and a hydrophilic oil agent is coated on the first fiber web layer.

[0014] The beneficial effects of this invention are as follows: both the first fiber web layer and the second fiber web layer are composed of bicomponent fibers. During the hot air forming process of the fine denier fibers in the first fiber web layer, the cortex melts and bonds to enhance the strength of the fiber web and offset the weakness of the fine fibers. The fine denier bicomponent fibers are mechanically interwoven in the gaps between the coarse denier bicomponent fibers to form a three-dimensional anchor. Combined with hot air bonding, a strong interface bond is achieved. Compared with the hot rolling process composite compression structure, the through-pores and fluffy properties of the first fiber web layer are retained. Attached Figure Description

[0015] Figure 1 This is a flow chart of the production process of the fluffy nonwoven fabric of the present invention.

[0016] Figure 2 This is a flow chart of the production process of fine denier bicomponent fiber filaments according to the present invention.

[0017] Figure 3 This is a flow chart of the coarse denier bicomponent fiber production process of the present invention.

[0018] Figure 4 This is a flow chart of the layered combing process of the present invention.

[0019] Figure 5 This is a schematic diagram of the fluffy nonwoven fabric structure of the present invention.

[0020] Figure 6 This is a schematic diagram of the thickness direction structure of the fluffy nonwoven fabric of the present invention.

[0021] Figure 7 This is a schematic diagram of the end face structure of the coarse denier bicomponent fiber filament of the present invention.

[0022] Figure 8 This is a schematic diagram of the end face structure of the fine denier bicomponent fiber filament of the present invention.

[0023] Wherein: 1-first fiber web layer, 2-second fiber web layer, 3-fine denier bicomponent fiber filament, 31-fine denier PET core layer, 32-fine denier COPET sheath layer, 4-coarse denier bicomponent fiber filament, 41-coarse denier PET core layer, 42-coarse denier PE sheath layer, 5-hydrophilic oil agent. Detailed Implementation

[0024] The embodiments of the present invention will be described below with reference to the accompanying drawings and related examples. The embodiments of the present invention are not limited to the following examples, and the present invention relates to the relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0025] A method for producing a bicomponent fluffy nonwoven fabric, wherein the fluffy nonwoven fabric includes a first fiber web layer 1 and a second fiber web layer 2 arranged sequentially from top to bottom along the thickness direction. The first fiber web layer 1 is made of a plurality of fine denier bicomponent fiber filaments 3, and the second fiber web layer 2 is made of a plurality of coarse denier bicomponent fiber filaments 4. The denier of the coarse denier bicomponent fiber filaments is 6-10 denier, and the denier of the fine denier bicomponent fiber filaments is 1.5-2.0 denier. The fine denier bicomponent fiber 3 includes a fine denier PET core layer 31 and a fine denier COPET sheath layer 32; The coarse denier bicomponent fiber 4 includes a coarse denier PET core layer 41 and a coarse denier PE sheath layer 42. The production process includes the following steps; Step 1: Prepare the fine denier bicomponent fiber 3 by drying and pretreating the fine denier core layer raw material and the fine denier sheath raw material respectively and adding modifiers. The fine denier sheath melt and the fine denier core layer melt are obtained by melting them separately. After filtering them separately, the fine denier sheath melt and the fine denier core layer melt enter the island-type composite spinning assembly and are extruded from the spinneret. Step 2; Prepare the coarse denier bicomponent fiber 4 by drying and pretreating the coarse denier core layer raw material and the coarse denier sheath layer raw material, adding compatibilizers respectively, and then melting them through a twin-screw melt extrusion spinning machine to obtain coarse denier sheath layer melt and coarse denier core layer melt. The coarse denier sheath layer melt and coarse denier core layer melt are fed into the composite spinning assembly for distribution and are then extruded through a concentric core-sheath spinneret for composite processing. Step 3: Layered carding, using a double doffer carding machine to card coarse denier bicomponent fibers to form a second fiber web layer 2, and card fine denier bicomponent fibers to form a first fiber web layer 1, and using an air pressure web laying system to form a negative pressure to isolate the first fiber web layer 1 and the second fiber web layer 2 and stack them up; Step 4; Microporous puncture composite: Use a needle to puncture the stacked fiber mesh layer, with the needle puncture angle being 75°~85°. Step 5: Gradient hot air bonding, through hot air treatment to form a fusion layer with different interlayer temperatures, so that the fine denier COPET skin layer 32 of the first fiber web layer 1 melts to form bonding points; and softens the coarse denier PE skin layer 42 and combines it with the interface of the fine denier layer melt; finally, it is quickly shaped by cold air treatment.

[0026] In the technical solution of this invention, step 1 specifically includes: Step 1.1: Raw material pretreatment: Add 0.8% carboxyl-terminated carbon nanotubes as modifier to the fine denier core layer raw material and perform vacuum drying at 120℃; add 0.2% polydimethylsiloxane as modifier to the fine denier skin layer raw material and perform forced air drying at 80℃. In step 1.1, a modifier is added during the granulation process of the fine denier core layer raw material. The modifier is 0.8% end-carboxylated carbon nanotubes, which improves the conductivity of the fine denier PET core layer 31 and enhances its antistatic properties. A modifier is added during the granulation process of the fine denier sheath raw material. The modifier is 0.2% polydimethylsiloxane, which improves the fluidity of the fine denier COPET sheath 32, giving it better fluidity during fiber forming and hot air bonding, and accelerating the forming process of fibers and fiber webs.

[0027] Step 1.2: Melting and filtration. The fine denier core material is melted through a single-screw extruder at a melting temperature of 265°C and then filtered through a 15μm precision filter. The fine denier skin material is melted through a single-screw extruder at a melting temperature of 245°C and then filtered through a 10μm precision filter. The finely filtered melt is less likely to clog the micropores of the spinneret during the spinneret process. Step 1.3; Composite spinning: The two melts enter the island-type composite spinning assembly, and the volume ratio of the sheath and core is controlled by the distributor. The melts are combined at a volume ratio of 3:7 by the distributor, extruded from the spinneret, and then quenched by blowing air and relaxed by steam to form the fine denier bicomponent fiber 3.

[0028] Furthermore, in step 1.3, the rapid cooling is performed using a gradient side-blowing rapid cooling method, consisting of a first cooling zone and a second cooling zone. The air temperature in the first cooling zone is 25°C, and the air temperature in the second cooling zone is 15°C. It should be noted that the air velocity in both the first and second cooling zones is 0.5 m / s. The extruded fiber filaments pass through the first and second cooling zones in one go, achieving uniform cooling through the cold air. At the same time, the zoned cooling design effectively prevents the fine denier bicomponent fiber filaments 3 from becoming brittle. Furthermore, step 2 specifically includes; Step 2.1: Raw material pretreatment, the coarse denier core layer raw material is vacuum dried at 120℃, and 2% maleic anhydride grafted POE compatibilizer is added to the coarse denier cortex raw material and then dried by forced air at 80℃. In step 2.1, a compatibilizer is added to the coarse denier skin material to improve its wear resistance. It should be noted that the viscosity difference between PE melt and PET melt is significant. In step 2.2, at a temperature of 265°C, the viscosity of PET melt is 1800 Pa·s, and the viscosity of PE melt is 500 Pa·s. The compatibilizer reduces the interfacial tension of PE melt, and the pressure difference between the PE melt pipe and the PET melt pipe is controlled at ≤0.5 MPa to effectively prevent the coarse denier PE skin 42 from cracking during extrusion.

[0029] Step 2.2; Twin-screw co-extrusion melting, the twin-screw extruder is used for zoned melting, wherein the melting zone temperature of the coarse denier core material is 265℃ and the melting zone temperature of the coarse denier skin material is 200℃, and the viscosity ratio of the core melt and the skin melt is controlled to be ≤3:1; Step 2.3; Composite spinning: The two melts enter the concentric sheath-core spinneret, the box temperature is controlled at 264-266℃, the volume ratio of the sheath and core is controlled by the distributor, and the composite is made at a volume ratio of 3:7 by the distributor, extruded from the spinneret orifice, and slowly cooled and shaped by the double-layer ring blowing device to form the coarse denier bicomponent fiber 4.

[0030] Furthermore, in the above scheme, step 3 specifically includes; Step 3.1: Opening: Open the coarse denier bicomponent fiber 4 and the fine denier bicomponent fiber separately; Step 3.2: After the coarse denier bicomponent fiber 4 is opened, it is transferred to the lower doffer layer to form the second fiber web layer 2 by carding with a cylinder at a speed of 750-850 rpm; Step 3.3; After the fine denier bicomponent fiber 3 is opened by airflow, it is combed by a cylinder at a speed of 1150-1250 rpm and transferred to the upper doffer to form the first fiber web layer 1; Step 3.4: Lay the net, isolate it with negative pressure airflow, lay the second fiber net layer 2 at a speed of 10m / min, and stack the first fiber net layer 1 at a speed of 15m / min, keeping the interlayer gap between the first fiber net layer 1 and the second fiber net layer 2 at 2-3mm.

[0031] In step 3, the fine denier bicomponent fiber 3 is lifted by the upper airflow, and the coarse denier bicomponent fiber 4 is compacted by the lower airflow. The upper airflow flows at a 30° angle from bottom to top and has a velocity of 0.3 to 0.5 m / s. The low-speed upper airflow prevents the fine denier bicomponent fiber 3 from scattering. The lower airflow flows vertically from top to bottom and has a velocity of 1.2 to 1.5 m / s. The high-speed lower airflow compacts the coarse denier bicomponent fiber, accelerating its formation.

[0032] Further, step 4 specifically includes: placing the stacked fiber web in the piercing device, and piercing the first fiber web layer 1 and extending it into the pores of the second fiber web layer 2 from top to bottom at a frequency of 500 to 600 times / minute; simultaneously applying an 8-10kV electrostatic field during piercing to orient the ends of the fine denier bicomponent fibers into the gaps between the coarse denier bicomponent fibers; wherein, the piercing depth is controlled to be 50% to 60% of the thickness of the second fiber web layer 2 after penetrating the first fiber web layer 1.

[0033] It should be noted that an electrostatic field is applied during the puncture process to assist in the puncture. The upper electrode is the puncture needle, which carries a negative charge, while the lower electrode is a receiving plate, with the bottom receiving plate carrying a positive charge. fine denier bicomponent fiber filaments 3. Carrying a negative charge, the needle is kept at 110°C by resistance heating; Furthermore, during the puncture, the fine denier bicomponent fiber shifts towards the coarse denier bicomponent fiber under the action of polar repulsion. The coarse denier bicomponent fiber carries a positive charge when it comes into contact with the receiving plate, which attracts the fine denier bicomponent fiber. Maintaining a temperature of 110°C during puncture can effectively soften the fine denier fiber, reduce puncture resistance, and prevent the melt from sticking to the needle.

[0034] As an improvement to the above scheme, step 5 specifically includes: Step 5.1: Stack the fiber web into the furnace. The double-layer fiber web after puncture is put into the hot air furnace under tension, where the tension value is 0.5~1.0 N / cm. Step 5.2; Upper layer hot air treatment: The first fiber web layer 1 is treated with hot air at 160-170℃ on the upper layer of the stacked fiber web. Step 5.3; Lower layer hot air treatment: The second fiber web layer 2 is treated with hot air at 120-130℃ in the lower layer of the stacked fiber web; Step 5.4; Cooling and shaping: Use cold air at a temperature of 20°C to cool and shape the stacked fiber web.

[0035] As an improvement to the above scheme, in the hot air treatment in step 5, hot air is used to perform hot air penetration treatment on the stacked fiber web, forming a melting temperature of 160°C in the upper space of the stacked fiber web and a melting temperature of 120°C in the lower space of the stacked fiber web.

[0036] It should be noted that after the stacked fiber web enters the furnace, the upper air nozzle of the hot air furnace outputs 165°C hot air towards the fine denier bicomponent fiber filament 3 in a vertically downward direction, fully melting the fine denier COPET skin layer 32 to form bonding points. The vertically downward airflow direction helps the molten fine denier COPET skin layer 32 to quickly bond with the coarse denier PE skin layer 42. The lower air nozzle of the hot air furnace outputs 125°C hot air towards the coarse denier bicomponent fiber filament 4 at a 45° angle, softening the coarse denier PE skin layer 42. Furthermore, in the above scheme, after the gradient hot air bonding step, the fluffy nonwoven fabric is subjected to a hydrophilic post-treatment, and a hydrophilic oil agent 5 is coated on the first fiber web layer 1.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for producing a two-component fluffy nonwoven fabric, wherein the fluffy nonwoven fabric comprises a first fiber web layer (1) and a second fiber web layer (2) arranged sequentially from top to bottom along the thickness direction, characterized in that, The first fiber web (1) is made of several fine denier bicomponent fiber filaments (3), and the second fiber web (2) is made of several coarse denier bicomponent fiber filaments (4); The fine denier bicomponent fiber filament (3) includes a fine denier PET core layer (31) and a fine denier COPET sheath layer (32); The coarse denier bicomponent fiber filament (4) includes a coarse denier PET core layer (41) and a coarse denier PE sheath layer (42). The production process includes the following steps; Step 1: Prepare the fine denier bicomponent fiber (3). Add modifiers to the fine denier core layer raw material and the fine denier sheath raw material respectively and then dry them for pretreatment. Obtain the fine denier sheath melt and the fine denier core layer melt by melting them separately. After filtering them separately, the fine denier sheath melt and the fine denier core layer melt enter the island-type composite spinning assembly and are extruded from the spinneret. Step 2; Prepare the coarse denier bicomponent fiber filament (4), pre-dry the coarse denier core layer raw material, pre-dry the coarse denier sheath raw material after adding compatibilizer, melt it through a twin-screw melt extrusion spinning machine to obtain coarse denier sheath melt and coarse denier core layer melt, the coarse denier sheath melt and coarse denier core layer melt enter the composite spinning assembly for distribution, and are compounded by extrusion through concentric core-sheath spinnerets; Step 3: Layered carding, the coarse denier bicomponent fibers are carded to form the second fiber web layer (2) by a double doffer carding machine, and the fine denier bicomponent fibers are carded to form the first fiber web layer (1). The first fiber web layer (1) and the second fiber web layer (2) are separated by negative pressure by an air pressure web laying system and stacked. Step 4; Microporous puncture composite: Use a needle to puncture the stacked fiber mesh layer, with the needle puncture angle being 75°~85°. Step 5; Gradient hot air bonding, through hot air treatment to form a fusion layer with different interlayer temperatures, so that the fine denier COPET skin layer (32) of the first fiber web layer (1) melts to form bonding points; and softens the coarse denier PE skin layer (42) and combines it with the fine denier layer melt interface; finally, it is quickly shaped by cold air treatment; Step 4 specifically includes: placing the stacked fiber web in the piercing device, and piercing the first fiber web layer (1) and extending it into the pores of the second fiber web layer (2) from top to bottom at a frequency of 500-600 times / minute; simultaneously applying an 8-10kV electrostatic field during piercing to orient the ends of the fine denier bicomponent fibers into the gaps between the coarse denier bicomponent fibers; wherein, the piercing depth is controlled to be 50%-60% of the thickness of the second fiber web layer (2) after penetrating the first fiber web layer (1); An electrostatic field is applied to assist puncture during the puncture process, wherein the upper electrode is the needle, which carries a negative charge, and the lower electrode is the receiving plate, which carries a positive charge. The fine denier bicomponent fiber (3) carries a negative charge, and the needle is kept at 110°C by resistance heating.

2. The method for producing two-component fluffy nonwoven fabric according to claim 1, characterized in that, Step 1 specifically includes: Step 1.1; Raw material pretreatment: 0.8% modified carboxylated carbon nanotubes were added to the fine denier core layer raw material and vacuum dried at 120℃; 0.2% modified polydimethylsiloxane was added to the fine denier skin layer raw material and forced air drying at 80℃. Step 1.2; Melting and Filtration: The fine denier core material is melted through a single-screw extruder at a melting temperature of 265°C and filtered through a 15μm precision filter; the fine denier skin material is melted through a single-screw extruder at a melting temperature of 245°C and filtered through a 10μm precision filter. Step 1.3; Composite spinning: The two melts enter the island-type composite spinning assembly, and the volume ratio of the sheath and core is controlled by the distributor. The two melts are combined at a volume ratio of 3:7 by the distributor, extruded from the spinneret, and shaped by air cooling and steam relaxation to form the fine denier bicomponent fiber filament (3).

3. The method for producing two-component fluffy nonwoven fabric according to claim 1, characterized in that, Step 2 specifically includes; Step 2.1: Raw material pretreatment, the coarse denier core layer raw material is vacuum dried at 120℃, and 2% maleic anhydride grafted POE is added to the coarse denier cortex raw material and then dried by forced air at 80℃. Step 2.2; Twin-screw co-extrusion melting, the twin-screw extruder is used for zoned melting, wherein the melting zone temperature of the coarse denier core material is 265℃ and the melting zone temperature of the coarse denier skin material is 200℃, and the viscosity ratio of the core melt and the skin melt is controlled to be ≤3:1; Step 2.3; Composite spinning: The two melts enter the concentric sheath-core spinneret, the box temperature is controlled at 264-266℃, the volume ratio of the sheath and core is controlled by the distributor, and the composite is made at a volume ratio of 3:7 by the distributor, extruded from the spinneret hole, and slowly cooled and shaped by the double-layer ring blowing device to form the coarse denier bicomponent fiber filament (4).

4. The method for producing two-component fluffy nonwoven fabric according to claim 2, characterized in that, In step 1.3, the rapid cooling is performed using a gradient side-blowing rapid cooling method, consisting of a first air-cooling zone and a second air-cooling zone. The air temperature in the first air-cooling zone is 25°C, and the air temperature in the second air-cooling zone is 15°C.

5. The method for producing two-component fluffy nonwoven fabric according to claim 1, characterized in that, Step 3 specifically includes: Step 3.1: Opening: Open the coarse denier bicomponent fiber (4) and the fine denier bicomponent fiber separately; Step 3.2; After the coarse denier bicomponent fiber filament (4) is opened, it is transferred to the lower doffer layer to form the second fiber web layer (2) by a cylinder carding at a speed of 750-850 rpm. Step 3.3; After the fine denier bicomponent fiber (3) is opened by airflow, it is combed by a cylinder at a speed of 1150-1250 rpm and transferred to the upper doffer to form the first fiber web layer (1). Step 3.4: Lay out the net, isolate it with negative pressure airflow, lay the second fiber net layer (2) at a speed of 10m / min, and stack the first fiber net layer (1) at a speed of 15m / min, keeping the interlayer gap between the first fiber net layer (1) and the second fiber net layer (2) at 2-3mm.

6. The method for producing two-component fluffy nonwoven fabric according to claim 1, characterized in that, Step 5 specifically includes: Step 5.1; Stacked fiber webs are fed into the furnace. The punctured double-layer fiber webs are introduced into the hot air furnace under tension, where the tension value is 0.5 to 1.0 N / cm. Step 5.2; Upper layer hot air treatment: The first fiber web layer (1) is subjected to hot air treatment at 160-170°C on the upper layer of the stacked fiber web; Step 5.3; Lower layer hot air treatment: The second fiber web layer (2) is subjected to hot air treatment at 120-130℃ in the lower layer of the stacked fiber web; Step 5.4; Cooling and shaping: Use cold air at a temperature of 20°C to cool and shape the stacked fiber web.

7. The method for producing two-component fluffy nonwoven fabric according to claim 6, characterized in that, In the hot air treatment in step 5, hot air is used to penetrate the stacked fiber web, forming a melting temperature of 160°C in the upper space of the stacked fiber web and a melting temperature of 120°C in the lower space of the stacked fiber web.

8. The method for producing two-component fluffy nonwoven fabric according to claim 1, characterized in that, After the gradient hot air bonding step, the fluffy nonwoven fabric is subjected to hydrophilic post-treatment, and a hydrophilic oil agent (5) is coated on the first fiber web layer (1).

Images