Preparation system suitable for superfine fiber non-woven fabric

Abstract

The utility model discloses a preparation system suitable for superfine fiber non-woven fabrics, which comprises a pulp dissolving tank, a double-screw extruder, a filtering device, a spinning device, a lapping conveyor, a washing device, a spunlace machine, a dryer and a winding machine which are sequentially arranged, the spinning device is connected with a hot air fan, the lapping conveyor is arranged below the spinning device, and the winding machine is connected with the washing device. A transverse cold air blowing device is arranged between a yarn outlet in the yarn spraying device and the lapping conveying belt and connected with a water vapor inlet pipe, and air outlets are distributed in the two sides of a yarn strip. A continuous passage for preparing the superfine fiber non-woven fabric is formed among the pulp dissolving tank, the double-screw extruder, the filtering device, the spinning device, the transverse cold air blowing device, the lapping conveyor, the washing device, the spunlace machine, the drying machine and the winding machine. The orderliness, controllability and stability of the preparation process are ensured, and the produced superfine fiber non-woven fabric has the characteristics of fine and soft fibers, concentrated diameter distribution and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a non - woven fabric preparation system especially applicable to the preparation system of super fine fiber non - woven fabric belongs to non - woven fabric production technical field. BACKGROUND

[0002] Melt blowing is a kind of nonwoven technology that polymer is heated and pressurized into a molten state, and then extruded into a web through spinneret and nozzle. The fiber diameter produced by melt blowing nonwoven technology is 1-10 microns, showing the advantages of super fine fiber, so that melt blowing nonwoven fabric is widely used in civil, industrial and other fields. With the development of technology in various fields and the enhancement of people's environmental protection consciousness, melt blowing nonwoven technology has developed rapidly in recent years. In the development of new materials, efforts are being made to study melt blowing nonwoven technology using cellulose solution as raw material.

[0003] At present, based on melt blowing, regenerated cellulose super fine fiber nonwoven fabric is prepared using cellulose solution as raw material. First, the nascent fiber web is collected on a dry and clean drum, and then the nascent fiber web is washed by water washing process to remove excess solvent in the fiber, so that the fiber is regenerated. This method produces high fiber adhesion, and more areas form a film, resulting in fewer filaments in the product nonwoven fabric, with some filaments embedded in the film and some filaments highly crosslinked between the films.

[0004] Prior art CN117026520A discloses "a manufacturing method of super fine fiber long fiber nonwoven fabric", CN109487435A discloses "a super fine fiber mesh nonwoven fabric", neither of which proposes a suitable preparation device or system. Although CN114481447A discloses "a production equipment and process of medical nonwoven fabric", it mainly sets up a steam piercing device to strengthen the connection strength between nonwoven fabric fibers to solve the problem of waste of a large amount of water resources when the existing water jetting method is used to reinforce nonwoven fabric.

[0005] Therefore, a preparation system based on water jetting and suitable for super fine fiber nonwoven fabric preparation process is needed. SUMMARY

[0006] The present application aims to solve the problems of high fiber adhesion, more areas forming a film, fewer filaments in the nonwoven fabric, and some filaments embedded in the film and some filaments highly crosslinked between the films in the prior art super fine fiber nonwoven fabric preparation, and proposes a preparation system suitable for super fine fiber nonwoven fabric.

[0007] In order to achieve the above technical purpose, the following technical scheme is proposed:

[0008] The technical scheme is used for preparing system of superfine fiber non-woven fabric, including pulp dissolving tank, filter device, spinning device, net laying conveyor, water washing device, water jet machine, dryer and winding machine arranged in sequence;

[0009] The pulp dissolving tank is arranged at the front side of the working position of the filter device, and the discharge port of the pulp dissolving tank is connected with the feeding port of the filter device through the double screw extruder;

[0010] The spinning device is arranged at the rear side of the working position of the filter device, and the filtrate outlet of the filter device is connected with the feeding port of the spinning device; the hot air inlet of the spinning device is connected with the hot air blower (such as Roots blower) through the hot air pipe;

[0011] The net laying conveyor belt of the net laying conveyor is arranged below the spinning device, the distance between the filament outlet of the spinning device and the net laying conveyor belt is 10-16 cm, the horizontal cold air blowing device is arranged between the filament outlet of the spinning device and the net laying conveyor belt, the horizontal cold air blowing device is connected with the water vapor inlet pipe, the air outlets are distributed on both sides of the filament, and the continuous passage of filament discharging, air cooling and web forming is formed between the filament outlet of the spinning device and the net laying conveyor belt;

[0012] The water washing device is arranged at the rear side of the working position of the net laying conveyor, and the net laying conveyor extends to the spraying position below the water washing device through the net laying conveyor belt;

[0013] The water jet machine is arranged at the rear side of the working position of the water washing device, and the net laying conveyor belt extends to the water jet position below the water jet machine;

[0014] The dryer is arranged at the rear side of the working position of the water jet machine, and the net laying conveyor belt extends to the feeding port of the dryer;

[0015] The winding machine is arranged at the rear side of the working position of the dryer;

[0016] The continuous passage of superfine fiber non-woven fabric preparation is formed between the pulp dissolving tank, the double screw extruder, the filter device, the spinning device, the horizontal cold air blowing device, the net laying conveyor, the water washing device, the water jet machine, the dryer and the winding machine.

[0017] Further, the dissolving pulp buffer tank is arranged at the rear side of the working position of the pulp dissolving tank, the discharge port of the pulp dissolving tank is connected with the feeding port of the dissolving pulp buffer tank, and the discharge port of the dissolving pulp buffer tank is connected with the feeding port of the double screw extruder. Through the arrangement of the dissolving pulp buffer tank, the fiber dissolving pulp is buffered, which can better connect the pulp dissolving tank and the double screw extruder, and further ensure the order and stability of the pulp dissolving tank discharge and the double screw extruder feeding.

[0018] Further, the metering pump is arranged between the filter device and the spinning device, which improves the controllability and meterability of the spinning process.

[0019] Further, the transverse cold air blowing device comprises an air outlet mechanism and a ventilation pipe, the air outlet mechanism is communicated with the ventilation pipe, and the air outlet is arranged at the end of the ventilation pipe; a water vapor inlet pipe is connected with a humidifier, the water vapor inlet pipe is communicated with the ventilation pipe, the cold air is humidified through the humidifier, and the humidified air cools and reduces the temperature of the yarn through the air outlet.

[0020] Further, the air outlet is a plurality of air outlets which are uniformly distributed on both sides of the yarn and uniformly cool the yarn blown out of the yarn outlet of the spinning device.

[0021] Further, the solvent collecting tank I is arranged below the net laying conveyor, the solvent collecting tank II is arranged below the washing device, the solvent collecting tank I and the solvent collecting tank II are connected with the pulp dissolving tank through reflux pipes, and the solvent is recycled and reused.

[0022] In the technical scheme, the positional relationship of "rear side of the station", "between", "front side of the station", "below", "above" and the like is defined according to the actual use state, is a conventional term in the technical field, and is a conventional term in the actual use process of the person skilled in the art.

[0023] In the description of the technical scheme, it should be noted that, unless otherwise specified and limited, "arrangement", "connection" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, can be indirectly connected through an intermediate medium, and can be connected inside two elements. For the person skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0024] The technical scheme has the beneficial technical effects that:

[0025] The utility model not only adapts to the preparation process, guarantees the orderliness, controllability and stability of the preparation process, but also has the characteristics of small fiber, softness and concentrated diameter distribution for the superfine fiber non-woven fabric produced.

[0026] The pulp dissolving tank, the double screw extruder, the filtering device, the spinning device, the transverse cold air blowing device, the net laying conveyor, the water washing device, the water jet machine, the drying machine and the winding machine are sequentially arranged, and a continuous path for preparing the superfine fiber non-woven fabric is formed between the pulp dissolving tank, the double screw extruder, the filtering device, the spinning device, the transverse cold air blowing device, the net laying conveyor, the water washing device, the water jet machine, the drying machine and the winding machine.

[0027] The double screw extruder is arranged to re-dissolve part of the undissolved impurities, and the stirring action of the double screw is utilized to homogenize the dissolved pulp, thereby improving the stability of subsequent spinning.

[0028] The transverse cold air blowing device is connected with a water vapor inlet pipe, that is, air cooling is adopted, so that the spun yarn is thinned and shaped under the action of wet and cold air, and then is laid on the net laying conveyor, and finally, the superfine fiber non-woven fabric has the characteristics of fine and soft fibers and concentrated diameter distribution. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a device arrangement schematic diagram of the preparation system in the utility model;

[0030] Figure 2 It is a working principle diagram involved in the utility model;

[0031] Figure 3 It is a working principle diagram involved in the spinning and blowing in the utility model;

[0032] Figure 4 It is a scanning electron microscope image of part of the superfine fiber non-woven fabric involved in the utility model;

[0033] In the drawing, 1 is a pulp dissolving tank, 2 is a double screw extruder, 3 is a filtering device, 4 is a spinning device, 5 is a transverse cold air blowing device, 6 is a net laying conveyor, 7 is a water washing device, 8 is a water jet machine, 9 is a drying machine, 10 is a hot air pipe, 11 is a water vapor inlet pipe, 12 is a yarn, 13 is a net laying conveyor belt, 14 is a dissolved pulp buffer tank, 15 is a metering pump, 16 is a solvent collecting tank I, 17 is a solvent collecting tank II, 18 is a reflux pipe, 19 is a hot air fan, and 20 is an evaporator. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] In the following examples, the detection standards of fiber whiteness, non-woven fabric transverse strength, non-woven fabric transverse elongation at break, non-woven fabric longitudinal strength and non-woven fabric longitudinal elongation at break are all FZ / T 64033;

[0036] The fiber fineness is observed and analyzed by using a scanning electron microscope (SEM) to observe the micro surface morphology of the sample. Before testing, a thin film of gold about 10 nm thick is deposited on the surface of the sample by vacuum deposition, and the test is performed using a 15 kV voltage.

[0037] Example 1

[0038] The present embodiment provides: the purpose of the present technical solution is to provide: as Figures 1-2 As shown, the preparation system suitable for ultra-fine fiber non-woven fabric includes, in sequence, a pulp dissolving tank 1, a filtering device 3, a spinning device 4, a web laying conveyor 6, a water washing device 7, a hydroentangling machine 8, a drying machine 9 and a winding machine; the pulp dissolving tank 1 is arranged at the front side of the working position of the filtering device 3, and the discharge port of the pulp dissolving tank 1 is connected with the feeding port of the filtering device 3 through a double-screw extruder 2; the spinning device 4 is arranged at the rear side of the working position of the filtering device 3, and the filtrate outlet of the filtering device 3 is connected with the feeding port of the spinning device 4; the hot air inlet of the spinning device 4 is connected with a hot air fan 19 (such as a Roots blower) through a hot air pipe 10;

[0039] The web laying conveyor 6 is arranged below the spinning device 4, and a transverse cold air blowing device 5 is arranged between the yarn outlet of the spinning device 4 and the web laying conveyor 13, the transverse cold air blowing device 5 is connected with a water vapor inlet pipe 11, the air outlets are distributed on both sides of the yarn 12, and the yarn outlet of the spinning device 4 and the web laying conveyor 13 form a continuous passage for yarn discharge, air cooling and web laying;

[0040] The water washing device 7 is arranged at the rear side of the working position of the web laying conveyor 6, and the web laying conveyor 6 extends to the spraying position below the water washing device 7 through the web laying conveyor 13; the hydroentangling machine 8 is arranged at the rear side of the working position of the water washing device 7, and the web laying conveyor 13 extends to the hydroentangling position below the hydroentangling machine 8; the drying machine 9 is arranged at the rear side of the working position of the hydroentangling machine 8, and the web laying conveyor 13 extends to the feeding port of the drying machine 9; and the winding machine is arranged at the rear side of the working position of the drying machine 9;

[0041] The pulp dissolving tank 1, the double-screw extruder 2, the filtering device 3, the spinning device 4, the transverse cold air blowing device 5, the web laying conveyor 6, the water washing device 7, the hydroentangling machine 8, the drying machine 9 and the winding machine form a continuous passage for the preparation of ultra-fine fiber non-woven fabric.

[0042] Example 2

[0043] On the basis of embodiment 1, in order to ensure the controllability, orderliness and stability of the feeding and discharging, the present embodiment is further limited as follows:

[0044] A dissolving pulp buffer tank 14 is arranged at the rear side of the position of the pulp dissolving tank 1, the discharging port of the pulp dissolving tank 1 is connected with the feeding port of the dissolving pulp buffer tank 14, and the discharging port of the dissolving pulp buffer tank 14 is connected with the feeding port of the double screw extruder 2. Through the arrangement of the dissolving pulp buffer tank 14, the fiber dissolving pulp is buffered, which can better connect the pulp dissolving tank 1 and the double screw extruder 2, thereby ensuring the orderliness and stability of the discharging of the pulp dissolving tank 1 and the feeding of the double screw extruder 2.

[0045] In addition, a metering pump 15 is arranged between the filtering device 3 and the spinning device 4, so as to improve the controllability and meterability of the spinning process.

[0046] Embodiment 3

[0047] On the basis of embodiments 1-2, the transverse cold air blowing device 5 is further limited in the present embodiment to further illustrate the technical solution.

[0048] The transverse cold air blowing device 5 comprises an air outlet mechanism and a ventilation pipe, the air outlet mechanism is communicated with the ventilation pipe, and the air outlet is arranged at the end of the ventilation pipe; the water vapor inlet pipe 11 is connected with a humidifier, the water vapor inlet pipe 11 is communicated with the ventilation pipe, the cold air is humidified through the humidifier, and the humidified air cools and cools the yarn 12 through the air outlet.

[0049] Among them, the air outlet is multiple, uniformly distributed on both sides of the yarn 12, uniformly air-cooling the yarn 12 sprayed from the yarn outlet of the spinning device 4.

[0050] Embodiment 4

[0051] On the basis of embodiments 1-3, in order to better recover the solvent and improve the cleanliness of the non-woven fabric production environment, the present embodiment is further limited as follows:

[0052] A solvent collection tank I 16 is arranged below the net laying conveyor 6, a solvent collection tank II 17 is arranged below the washing device 7, and the solvent collection tank I 16 and the solvent collection tank II 17 are connected with the pulp dissolving tank 1 through the reflux pipe 18, so as to realize the recovery and reuse of the solvent. More preferably, the recovered solvent contains impurities, so it needs to be filtered and purified before reuse. Among them, the solvent recovery and purification can effectively reduce the production cost. The equipment involved mainly includes an evaporator 20, that is, the solvent collection tank I 16 is connected with the evaporator 20 through the reflux pipe 18, the solvent collection tank II 17 is connected with the evaporator 20 through the reflux pipe 18, and the discharging port of the evaporator 20 is connected with the pulp dissolving tank 1.

[0053] In addition, the distance between the spinning port on the spinning device 4 and the laying conveyor belt 13 is 10-16 cm, which ensures better laying, at the same time, the yarn 12 can be effectively air-cooled, and the ultra-fine fibers are formed, and the solvent is removed in time.

[0054] Example 5

[0055] In the prior art, when preparing the melt-blown non-woven fabric of regenerated cellulose ultra-fine fibers, the fiber adhesion is high, a large area forms a film, the number of filaments in the non-woven fabric is small, and part of the filaments are embedded in the film, and part of the filaments are highly crossed and connected between the films.

[0056] Therefore, by removing most of the solvent (N-methyl morpholine-N-oxide, NMMO) in time, the dissolved pulp stream is more easily deformed under the action of the air flow, the entanglement degree between the fibers is reduced, and therefore, the final form of the fibers is maintained after regeneration, that is, the fiber diameter is 2-7.5 µm, and the fiber diameter is concentrated in 3.5-6.5 µm; and by using transverse cold air and water washing, the remaining solvent (1-3%) is removed in time, and the final form of the regenerated fibers is maintained, that is, a melt-blown non-woven fabric with concentrated fiber diameter and uniform appearance is prepared.

[0057] On the basis of Examples 1-4, this embodiment combines actual production to show the debugging process and production process in part of the production process, that is, a preparation process of a regenerated cellulose-based ultra-fine fiber non-woven fabric is proposed, as shown in Figures 2-3 , which specifically includes the following steps:

[0058] 1) Taking pulp as raw material, cutting pulp, mixing, pre-dissolving and dissolving to obtain cellulose dissolved pulp;

[0059] 2) The cellulose dissolved pulp is passed into a filtering device through a double-screw extruder, filtered, and filtered cellulose dissolved pulp is obtained. The number of subsequent spinneret hole blockages involved by the double-screw extruder and the double-screw extruder without increase is counted, and the results are as shown in Table 1.

[0060] Table 1: Number of subsequent spinneret hole blockages

[0061]

[0062] Further, the shear force of the double-screw extruder is used to dissolve part of the undissolved impurities again, the stirring action of the double screw is used to homogenize the dissolved pulp, and the stability of subsequent spinning is improved;

[0063] The indexes of the cellulose dissolved pulp before filtration are as shown in Table 2.

[0064] Table 2: Indexes of cellulose dissolved pulp (before filtration)

[0065]

[0066] The filtered cellulose dissolving pulp has the indexes as shown in Table 3.

[0067] Table 3 Indexes of the cellulose dissolving pulp (after filtration)

[0068]

[0069] 3) The filtered cellulose dissolving pulp is fed into a spinning device with a pore size of 0.15-0.25 mm, the hot air volume of the Roots blower of the air duct of the spinning device is controlled to be 1000-1300 Hz and the temperature is controlled to be 95-98℃, the temperature of the die head of the spinning device is controlled to be 95-98℃, and a fiber filament is obtained. After the filtered cellulose dissolving pulp passes through the spinning device hole, the dissolving pulp is gradually drawn under the action of hot air, and finally a fiber filament is formed.

[0070] 4) A netting conveyor is used to receive the fiber filament, and a transverse cold air with a humidity of 75-90% RH, a temperature of 25-27℃ and an air volume of 200-400 Hz is used to blow the fiber filament on both sides between the fiber filament outlet of the spinning device and the netting conveyor. The distance between the fiber filament outlet of the spinning device and the netting conveyor is 10-16 cm, and the motor of the netting conveyor has a webbing speed of 150-180 m / min. The detection results of the fiber web on the netting conveyor are shown in Table 4.

[0071] Table 4 Detection results of the fiber web formed after blowing

[0072]

[0073] 5) The received fiber web is sent to a water washing device through the netting conveyor, and is washed by deionized water at a spraying station. The washing conditions involved are shown in Table 5.

[0074] Table 5 Washing conditions

[0075]

[0076] The detection results of the fiber web after water washing are shown in Table 6.

[0077] Table 6 Detection results of the fiber web after water washing

[0078]

[0079] 6) The washed fiber web is sent to a hydroentangling machine, and is hydroentangled at a hydroentangling station to obtain a regenerated cellulose ultrafine fiber non-woven fabric primary product. The hydroentangling conditions involved are shown in Table 7.

[0080] Table 7 Hydroentangling conditions

[0081]

[0082] And, the detection result of the non-woven fabric primary product formed after the water jet is shown in Table 8;

[0083] Table 8: Detection result of non-woven fabric primary product (gram weight: 60gsm)

[0084]

[0085] 7) The non-woven fabric primary product is sent into a drying machine; in the drying station, the moisture is removed, and a regenerated cellulose microfiber non-woven fabric product is obtained (as shown in Table 8), which can be wound, packaged, etc. according to requirements; wherein, the drying conditions involved are shown in Table 9; Figure 4

[0086] Table 9: Drying conditions

[0087]

[0088] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.​

Claims

1. A system for producing an ultrafine fiber nonwoven fabric, characterized by comprising: The device comprises a pulp dissolving tank (1), a filtering device (3), a spinning device (4), a web laying conveyor (6), a water washing device (7), a water jet machine (8), a drying machine (9) and a winding machine arranged in sequence. The pulp dissolving tank (1) is arranged at the front side of the filtering device (3), and the discharge port of the pulp dissolving tank (1) is connected with the feeding port of the filtering device (3) through a double screw extruder (2); the spinning device (4) is arranged at the rear side of the filtering device (3), the filtrate outlet of the filtering device (3) is connected with the feeding port of the spinning device (4), and the hot air inlet of the spinning device (4) is connected with a hot air fan (19) through a hot air pipe (10). The web laying conveyor (6) is arranged below the spinning device (4), the horizontal cold air blowing device (5) is arranged between the yarn outlet of the spinning device (4) and the web laying conveyor (13), the horizontal cold air blowing device (5) is connected with a water vapor inlet pipe (11), the air outlets are distributed on both sides of the yarn (12), and the yarn outlet of the spinning device (4) and the web laying conveyor (13) form a continuous path for yarn discharging, air cooling and web laying. The water washing device (7) is arranged at the rear side of the web laying conveyor (6), the web laying conveyor (6) extends to the spraying station below the water washing device (7) through the web laying conveyor (13); the water jet machine (8) is arranged at the rear side of the water washing device (7), the web laying conveyor (13) extends to the water jet station below the water jet machine (8); the drying machine (9) is arranged at the rear side of the water jet machine (8), and the web laying conveyor (13) extends to the feeding port of the drying machine (9); and the winding machine is arranged at the rear side of the drying machine (9). The pulp dissolving tank (1), the double screw extruder (2), the filtering device (3), the spinning device (4), the horizontal cold air blowing device (5), the web laying conveyor (6), the water washing device (7), the water jet machine (8), the drying machine (9) and the winding machine form a continuous path for preparing the ultra-fine fiber non-woven fabric.

2. The system for producing an ultra-fine fiber nonwoven fabric according to claim 1, wherein A dissolving pulp buffer tank (14) is arranged at the rear side of the pulp dissolving tank (1), the discharge port of the pulp dissolving tank (1) is connected with the feeding port of the dissolving pulp buffer tank (14), and the discharge port of the dissolving pulp buffer tank (14) is connected with the feeding port of the double screw extruder (2).

3. The system for producing an ultra-fine fiber nonwoven fabric according to claim 2, wherein A metering pump (15) is arranged between the filtering device (3) and the spinning device (4).

4. The system for producing an ultra-fine fiber nonwoven fabric according to claim 1, wherein The pore diameter of the spinneret plate in the spinning device (4) is 0.15-0.25 mm.

5. The system for producing an ultra-fine fiber nonwoven fabric according to claim 1, wherein The distance between the yarn outlet of the spinning device (4) and the web laying conveyor (13) is 10-16 cm.

6. The system for producing an ultra-fine fiber nonwoven fabric according to any one of claims 1 to 5, wherein The horizontal cold air blowing device (5) comprises an air outlet mechanism and a ventilation pipe, the air outlet mechanism is communicated with the ventilation pipe, the air outlets are arranged at the end of the ventilation pipe, and the water vapor inlet pipe (11) is connected with a humidifier and communicated with the ventilation pipe.

7. The system for producing an ultra-fine fiber nonwoven fabric according to claim 6, wherein The air outlets are multiple and uniformly distributed on both sides of the yarn (12).

8. The system for producing an ultra-fine fiber nonwoven fabric according to claim 1, wherein The solvent collecting groove I (16) is connected with the evaporator (20) through the reflux pipe (18), and the solvent collecting groove II (17) is connected with the evaporator (20) through the reflux pipe (18), and the discharge port of the evaporator (20) is connected with the pulp dissolving tank (1).

9. The system for producing an ultra-fine fiber nonwoven fabric according to claim 8, wherein The solvent collecting groove I (16) is connected with the evaporator (20) through the reflux pipe (18), and the solvent collecting groove II (17) is connected with the evaporator (20) through the reflux pipe (18), and the discharge port of the evaporator (20) is connected with the pulp dissolving tank (1).

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