JP2015059294A - Method for producing melt-blown nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a melt-blown nonwoven fabric having a good heat resistance in which an average fiber diameter is thin and a reduction of the molecular weight is small.SOLUTION: The method for producing a melt-blown nonwoven fabric is a method for producing a nonwoven fabric by melt blowing a thermoplastic resin through a melt blow nozzle to fiberize and includes irradiating the melt blow nozzle with an infrared ray to heat a surface of the melt blow nozzle to a temperature that is higher by 5°C-100°C than a temperature when it is not irradiated with an infrared ray. It is preferable that the thermoplastic resin is selected from the group consisting of polyester-based, polyurethane-based, polyacrylic, polyamide-based, polyvinyl-based, polyolefin-based, and fluorine-based resins.

Description

  The present invention relates to a method for producing a melt blown nonwoven fabric.

The method of producing a nonwoven fabric consistently and continuously by making a thermoplastic raw material fiber by melt spinning, blowing the fiber with a high-speed gas and collecting it in a sheet form on a collection plate is called the melt blow method. For example, it is disclosed in Patent Document 1.
Patent Document 2 discloses a polyurethane melt blown nonwoven fabric of ultrafine fibers having an average fiber diameter (hereinafter referred to as an average fiber diameter) of 3 μm or less capable of filtering fine objects.
Patent Document 3 discloses a method for producing a polyester melt blown nonwoven fabric of ultrafine fibers having an average fiber diameter of 0.8 to 5.0 μm by a melt blow method.

Japanese Patent Publication No. 01-30945 Patent No. 3098681 Japanese Examined Patent Publication No. 63-53309

However, Patent Document 1 is a polyurethane resin melt-blown nonwoven fabric having an average fiber diameter of 20 μm or more.
Moreover, although patent document 2 describes a polyurethane melt blown nonwoven fabric of ultrafine fibers having an average fiber diameter of 3 μm or less, this is depolymerized by melting the resin at a high temperature in order to reduce the fiber diameter, By reducing the molecular weight, the polymer fluidity during spinning is increased, and the fiber diameter is reduced. In this case, since the molecular weight is lowered, the heat resistance is poor.
In Patent Document 3, a melt-blown nonwoven fabric with a thin average fiber diameter is produced by melt-blowing polyester with high-temperature and high-pressure steam, but the polyester is hydrolyzed by exposure to high-temperature steam, resulting in a decrease in molecular weight. The resulting nonwoven fabric has a problem of poor heat resistance.

  Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a method for producing a melt-blown nonwoven fabric having a small average fiber diameter and a low molecular weight with good heat resistance.

  The method for producing the melt blown nonwoven fabric according to the first invention of the present invention, which has been made to achieve the above object, is to provide infrared rays to the melt blow nozzle when the thermoplastic resin is melt blown through the melt blow nozzle and made into fibers. And the melt blow nozzle surface temperature is heated to a temperature higher by 5 ° C. to 100 ° C. than the time of non-irradiation.

  The method for producing a melt blown nonwoven fabric of the second invention of the present invention is the method for producing the melt blown nonwoven fabric according to the first invention, wherein the thermoplastic resin is polyester, polyurethane, polyolefin, polyamide, polyacryl, It is a thermoplastic resin selected from the group consisting of polyvinyl resins and fluorine resins.

According to the method for producing a melt blown nonwoven fabric of the present invention, by heating the melt blow nozzle surface by irradiating infrared rays to the melt blow nozzle, it is possible to suppress a decrease in the melt blow nozzle surface temperature and to make the fiber diameter easy to be thinned. Even if the thermoplastic resin is melted and depolymerized at a high temperature and the molecular weight is not lowered more than necessary, the average fiber diameter can be made extremely fine by melt blowing. For this reason, a nonwoven fabric with high heat resistance can be obtained even with a thin average fiber diameter.
In addition, since the average fiber diameter can be reduced without melting by high temperature and high pressure steam, even thermoplastic resins that cause hydrolysis such as polyester do not cause hydrolysis and have no heat loss due to molecular weight reduction. A thin product having a good average fiber diameter can be obtained.

FIG. 1 is an explanatory view showing a schematic configuration of an example of an apparatus used when producing the melt blown nonwoven fabric of the present invention.

Hereinafter, the present invention will be described in detail.
The present invention is a method for producing a melt-blown nonwoven fabric, in which a nonwoven fabric is produced by melting a thermoplastic resin and melt-blowing with a high-temperature air through a melt-blowing nozzle.

  In the method for producing a melt blown nonwoven fabric of the present invention, when a thermoplastic resin is melt blown through a melt blow nozzle to be fiberized, the melt blow nozzle is irradiated with infrared rays so that the surface temperature of the melt blow nozzle is 5 ° C. Heat to 100 ° C, preferably 10 ° C to 80 ° C, more preferably 20 ° C to 70 ° C higher.

  The suitable manufacturing method of the melt blown nonwoven fabric of this invention is demonstrated based on the apparatus of FIG. In addition, FIG. 1 is explanatory drawing which shows schematic structure of an example of the apparatus used when manufacturing the melt blown nonwoven fabric of this invention.

  As shown in FIG. 1, the thermoplastic resin is melted and extruded by an extruder 10. In the extruder 10, a screw 12 is inserted through a barrel 13 with a heater, and a hopper tank 11 is attached. The screw 12 is connected to the motor 16 by a belt. When the thermoplastic resin is introduced from the hopper tank 11, it is kneaded by the rotation of the screw 12 while being heated by the barrel 13 with the heater, and is softened and melted. The thermoplastic resin passes through the polymer pipe 14 and is measured by the gear pump 15. Discharged.

  The surface of the melt blow nozzle 4 is heated by the infrared rays 7 irradiated from the infrared irradiation devices 6a and 6b, and the surface temperature is higher by 5 ° C to 100 ° C than that at the time of non-irradiation, preferably 10 ° C to 80 ° C, More preferably, the temperature is higher by 20 ° C to 70 ° C. The melt blow nozzle surface temperature is a temperature in a state where high-temperature air is being blown, and the temperature is measured by using a radiation thermometer and setting the emissivity to 0.83.

  The infrared irradiation devices 6a and 6b of the present invention can use, for example, HEAT BEAM (near infrared irradiation heater by a halogen lamp) manufactured by Highbeck Co., Ltd., and can appropriately adjust the output. Also, other infrared irradiation devices may be used as long as the surface of the melt blow nozzle can be heated to a suitable temperature.

Infrared irradiation devices include ceramic heaters and carbon dioxide lasers. For heating the surface of the melt blow nozzle, which is a metal (SUS), the metal body can absorb more in the short wavelength range of 1 to 2 μm, and a halogen lamp with a heater heat source temperature of 2000 ° C. or higher can be used. A near infrared irradiation device is preferably used.
This is the Stefan-Boltzmann law, where the amount of radiated electric heat is proportional to the difference between the fourth power of the heating element temperature and the fourth power of the heated object temperature. It is because it can heat more efficiently.

  Alternatively, a reflection film or a reflection plate may be attached to a halogen lamp that is a heat source, and the surface of the melt-blow nozzle may be heated more efficiently by irradiating diffused infrared rays as parallel irradiation or condensed irradiation.

  The melt blow nozzle 4 includes air inlets 5a and 5b, and the air inlets 5a and 5b are connected to an external compressor (not shown) and an air heating device (not shown). Between the piping connected from the compressor to the air heating device, a pressure reducing valve for controlling air pressure from the compressor, a flow meter for measuring the air flow rate, and a regulator (for example, a needle valve) for adjusting the air flow rate may be connected. .

  The thermoplastic resin discharged from the melt blow nozzle 4 and softened and melted is melt blown with high-temperature air, and is crushed into fine fibers to become ultrafine fibers 1 having a desired diameter, and is sucked by the suction 8 on the net conveyor 9. It becomes the melt blown nonwoven fabric 2 trapped randomly.

  The suction 8 sucks the blown air and also serves to assist the collection of the ultrafine fibers 1 on the net conveyor 9. An air pipe (not shown) is connected to the suction 8 and the sucked air is discharged to the outside through the air pipe. Further, the net conveyor 9 may be connected to a heat embossing device or a heat calendar roll for welding the collected ultrafine fibers. The collected ultrafine fibers become a melt blown nonwoven fabric 2, which is sequentially fed by a net conveyor 9 and wound by a winding roll 3.

In the method for producing the melt blown nonwoven fabric of the present invention, the thermoplastic resin used as a raw material is not particularly limited. For example, polyester resin, polyurethane resin, polyolefin resin, polyamide resin, polyacryl resin, polyvinyl resin, fluorine resin, etc. The thermoplastic resin comprised from the at least 1 or more types chosen is mentioned.
If the thermoplastic resin is as described above, the fiber diameter is controlled by irradiating the melt blow nozzle with infrared rays as described above to heat the surface of the melt blow nozzle, thereby suppressing a decrease in the temperature of the melt blow nozzle surface due to air blow. However, even when melted and depolymerized at high temperature, the molecular weight can be reduced to an ultrafine fiber without unnecessarily decreasing.

  On the other hand, if the material is normally melt blown as in Patent Document 2, if it is melted at high temperature and depolymerized to be thinned, the molecular weight is unnecessarily lowered, and the heat resistance is lowered. Further, when the molecular weight is not lowered without depolymerization, the polymer fluidity at the time of spinning is low, and a thin fiber diameter cannot be obtained. In the present invention, as described above, the melt blow nozzle surface is heated by irradiating infrared rays, and the decrease in the melt blow nozzle surface temperature is suppressed, so the fiber diameter is easily reduced, and the decrease in molecular weight is also suppressed. An extremely fine melt blown nonwoven fabric having good heat resistance can be obtained.

  Thus, when a melt-blown nonwoven fabric is produced by the production method of the present invention, a heat-resistant nonwoven fabric can be efficiently obtained even when an ultrafine fiber nonwoven fabric is obtained.

  In addition, the manufacturing apparatus mentioned above is an example of the apparatus which manufactures the melt blown nonwoven fabric of this invention, and is not limited to this apparatus.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, this invention is not limited to the Example described below.

  In the examples, the surface temperature of the melt blow nozzle was measured using a radiation thermometer with the emissivity set to 0.83.

  In the examples, the average fiber diameter of the melt blown nonwoven fabric was calculated by arbitrarily measuring the fiber diameters at 50 locations from the SEM photograph.

  The intrinsic viscosity of the thermoplastic resin and the melt blown non-woven fabric composed thereof is an appropriate solvent (for example, N, N-dimethylformamide in the case of polyurethane. Phenol / tetrachloroethane = 6/4 [mass ratio] mixture in the case of polyamide 6, EvOH, PBT) ), 0.500 g of the polymer was dissolved in 50 ml of the solvent, and measured at a temperature of 25 ° C. using an Ubbelohde viscometer.

[Example 1]
An ether-based thermoplastic polyurethane resin (inherent viscosity 0.867) having a Shore A hardness of 94 was vacuum-dried at a temperature of 110 ° C. for 24 hours, and the resin moisture was measured by the Karl Fischer method to be 23 ppm. A polyurethane melt blown nonwoven fabric is produced by melt blowing the polyurethane resin at a spinning temperature of 235 ° C., an air temperature of 265 ° C., an air flow rate of 200 m / sec, a nozzle hole diameter of 0.12 mm, and an infrared irradiation output of 195 W using the apparatus shown in FIG. did. The melt blow nozzle surface temperature was 249 ° C.
The intrinsic viscosity of the obtained polyurethane melt blown nonwoven fabric was 0.573.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 2.00 μm.

[Example 2]
An ether-based thermoplastic polyurethane resin (inherent viscosity 0.867) having a Shore A hardness of 94 was vacuum-dried at a temperature of 110 ° C. for 24 hours, and the resin moisture was measured by the Karl Fischer method to be 23 ppm. A polyurethane melt blown nonwoven fabric is produced by melt blowing the polyurethane resin at a spinning temperature of 235 ° C., an air temperature of 265 ° C., an air flow rate of 200 m / sec, a nozzle hole diameter of 0.12 mm, and an infrared irradiation output of 325 W using the apparatus of FIG. did. The melt blow nozzle surface temperature was 263 ° C.
The intrinsic viscosity of the obtained polyurethane melt blown nonwoven fabric was 0.566.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 1.83 μm.

[Example 3]
An ether-based thermoplastic polyurethane resin (inherent viscosity 0.867) having a Shore A hardness of 94 was vacuum-dried at a temperature of 110 ° C. for 24 hours, and the resin moisture was measured by the Karl Fischer method to be 23 ppm. A polyurethane melt blown nonwoven fabric is produced by melt blowing the polyurethane resin at a spinning temperature of 235 ° C., an air temperature of 265 ° C., an air flow rate of 200 m / sec, a nozzle hole diameter of 0.12 mm, and an infrared irradiation output of 488 W using the apparatus of FIG. did. The melt blow nozzle surface temperature was 280 ° C.
The intrinsic viscosity of the obtained polyurethane melt blown nonwoven fabric was 0.530.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 1.77 μm.

[Comparative Example 1]
An ether-based thermoplastic polyurethane resin (inherent viscosity 0.867) having a Shore A hardness of 94 was vacuum-dried at a temperature of 110 ° C. for 24 hours, and the resin moisture was measured by the Karl Fischer method to be 23 ppm. A polyurethane melt blown nonwoven fabric was produced by melt blowing the polyurethane resin at a spinning temperature of 235 ° C., an air temperature of 265 ° C., an air flow rate of 200 m / sec, and a nozzle hole diameter of 0.12 mm. The surface temperature of the melt blow nozzle was 219 ° C.
The intrinsic viscosity of the obtained polyurethane melt blown nonwoven fabric was 0.581.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 3.04 μm.

[Comparative Example 2]
An ether-based thermoplastic polyurethane resin (inherent viscosity 0.867) having a Shore A hardness of 94 was vacuum-dried at a temperature of 110 ° C. for 24 hours, and the resin moisture was measured by the Karl Fischer method to be 23 ppm. A polyurethane melt blown nonwoven fabric was produced by melt blowing this polyurethane resin in a conventional manner at a spinning temperature of 250 ° C., an air temperature of 265 ° C., an air flow rate of 200 m / sec, and a die hole diameter of 0.12 mm. The surface temperature of the melt blow nozzle was 224 ° C.
The intrinsic viscosity of the obtained polyurethane melt blown nonwoven fabric was 0.544.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 2.49 μm.

[Example 4]
When the water content of an ethylene-vinyl alcohol copolymer resin (EvOH resin) (inherent viscosity 1.021) having an ethylene copolymerization ratio of 38 mol% was measured by the Karl Fischer method, it was 367 ppm. The EvOH melt blown nonwoven fabric is manufactured by melt blowing the EvOH resin using the apparatus shown in FIG. 1 at a spinning temperature of 220 ° C., an air temperature of 240 ° C., an air flow rate of 170 m / sec, a nozzle hole diameter of 0.12 mm, and an infrared irradiation output of 325 W. did. The melt blow nozzle surface temperature was 255 ° C.
The intrinsic viscosity of the obtained EvOH meltblown nonwoven fabric was 1.086.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 13.65 μm.

[Comparative Example 3]
When the water content of an ethylene-vinyl alcohol copolymer resin (EvOH resin) (inherent viscosity 1.021) having an ethylene copolymerization ratio of 38 mol% was measured by the Karl Fischer method, it was 367 ppm. This EvOH resin was melt blown by a conventional method at a spinning temperature of 220 ° C., an air temperature of 240 ° C., an air flow rate of 170 m / sec, and a die hole diameter of 0.12 mm, thereby producing an EvOH melt blown nonwoven fabric. The melt blow nozzle surface temperature was 210 ° C.
The intrinsic viscosity of the obtained EvOH meltblown nonwoven fabric was 1.094.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 25.38 μm.

[Comparative Example 4]
When the water content of an ethylene-vinyl alcohol copolymer resin (EvOH resin) (inherent viscosity 1.021) having an ethylene copolymerization ratio of 38 mol% was measured by the Karl Fischer method, it was 367 ppm. This EvOH resin was melt blown by a conventional method at a spinning temperature of 235 ° C., an air temperature of 240 ° C., an air flow rate of 170 m / sec, and a nozzle hole diameter of 0.12 mm to produce an EvOH melt blown nonwoven fabric. The melt blow nozzle surface temperature was 214 ° C.
The intrinsic viscosity of the obtained EvOH melt blown nonwoven fabric was 1.103.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 24.39 μm.

[Example 5]
When the resin moisture of the polyamide 6 resin (PA6 resin) (inherent viscosity 1.003) was measured by the Karl Fischer method, it was 338 ppm. This PA6 resin is melt blown using the apparatus of FIG. 1 at a spinning temperature of 240 ° C., an air temperature of 260 ° C., an air flow rate of 195 m / sec, a nozzle hole diameter of 0.12 mm, and an infrared irradiation output of 325 W to produce a PA 6 melt blown nonwoven fabric. did. The melt blow nozzle surface temperature was 262 ° C.
The inherent viscosity of the obtained PA6 meltblown nonwoven fabric was 1.027.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 2.77 μm.

[Comparative Example 5]
When the resin moisture of the polyamide 6 resin (PA6 resin) (inherent viscosity 1.003) was measured by the Karl Fischer method, it was 338 ppm. This PA6 resin was melt blown by a conventional method at a spinning temperature of 240 ° C., an air temperature of 260 ° C., an air flow rate of 195 m / sec, and a die hole diameter of 0.12 mm, thereby producing a PA 6 melt blown nonwoven fabric. The melt blow nozzle surface temperature was 220 ° C.
The inherent viscosity of the obtained PA6 meltblown nonwoven fabric was 1.062.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 3.87 μm.

[Comparative Example 6]
When the resin moisture of the polyamide 6 resin (PA6 resin) (inherent viscosity 1.003) was measured by the Karl Fischer method, it was 338 ppm. This PA6 resin was melt blown in a conventional manner at a spinning temperature of 255 ° C., an air temperature of 260 ° C., an air flow rate of 195 m / sec, and a die hole diameter of 0.12 mm, thereby producing a PA 6 melt blown nonwoven fabric. The surface temperature of the melt blow nozzle was 224 ° C.
The intrinsic viscosity of the obtained PA6 meltblown nonwoven fabric was 1.008.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 3.51 μm.

[Example 6]
Polybutylene terephthalate resin (PBT resin) (intrinsic viscosity 1.013) was vacuum dried at 105 ° C. for 10 hours, and the resin moisture was measured by the Karl Fischer method to be 14 ppm. A PBT melt blown nonwoven fabric is produced by melt blowing the PBT resin at a spinning temperature of 270 ° C., an air temperature of 295 ° C., an air flow rate of 140 m / sec, a nozzle hole diameter of 0.12 mm, and an infrared irradiation output of 325 W using the apparatus shown in FIG. did. The surface temperature of the melt blow nozzle was 305 ° C.
The intrinsic viscosity of the obtained PBT meltblown nonwoven fabric was 0.891.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 4.70 μm.

[Comparative Example 7]
Polybutylene terephthalate resin (PBT resin) (intrinsic viscosity 1.013) was vacuum dried at 105 ° C. for 10 hours, and the resin moisture was measured by the Karl Fischer method to be 14 ppm. This PBT resin was melt blown by a conventional method at a spinning temperature of 270 ° C., an air temperature of 295 ° C., an air flow rate of 140 m / sec, and a nozzle hole diameter of 0.12 mm, thereby producing a PBT melt blown nonwoven fabric. The surface temperature of the melt blow nozzle was 253 ° C.
The intrinsic viscosity of the obtained PBT meltblown nonwoven fabric was 0.904.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 6.15 μm.

[Comparative Example 8]
Polybutylene terephthalate resin (PBT resin) (intrinsic viscosity 1.013) was vacuum dried at 105 ° C. for 10 hours, and the resin moisture was measured by the Karl Fischer method to be 14 ppm. This PBT resin was melt blown by a conventional method at a spinning temperature of 285 ° C., an air temperature of 295 ° C., an air flow rate of 140 m / sec, and a nozzle hole diameter of 0.12 mm, thereby producing a PBT melt blown nonwoven fabric. The melt blow nozzle surface temperature was 256 ° C.
The intrinsic viscosity of the obtained PBT meltblown nonwoven fabric was 0.853.
The fiber diameter was measured from the SEM photograph, and the average fiber diameter was calculated. As a result, the average fiber diameter was 5.29 μm.

The results of the above examples and comparative examples are shown in Table 1 below.

  The melt blown nonwoven fabrics obtained from Examples 1 to 3 were nonwoven fabrics having a small average fiber diameter, little decrease in intrinsic viscosity, and good heat resistance. The nonwoven fabric obtained from Comparative Example 1 in which the melt blow nozzle is not heated with infrared rays does not have a small average fiber diameter, and the nonwoven fabric obtained from Comparative Example 2 in which the spinning temperature is increased without heating the melt blow nozzle with infrared rays. Compared with the product of the example, the average fiber diameter was not small, and the intrinsic viscosity was greatly reduced and the heat resistance was poor.

The nonwoven fabric obtained from Example 4 had almost no decrease in intrinsic viscosity and good heat resistance, although the average fiber diameter was smaller than when the melt blow nozzle was not heated with infrared rays.
In addition, the nonwoven fabric obtained from Comparative Example 3 in which the melt blow nozzle is not heated by infrared rays and the nonwoven fabric obtained from Comparative Example 4 in which the spinning temperature is raised without heating the melt blow nozzle are not reduced in average fiber diameter, and are thinned. could not.

The nonwoven fabric obtained from Example 5 did not have a decrease in intrinsic viscosity and had good heat resistance even though the average fiber diameter was smaller than when the melt blow nozzle was not heated with infrared rays.
In addition, the nonwoven fabric obtained from Comparative Example 5 in which the melt blow nozzle is not heated by infrared rays and the nonwoven fabric obtained from Comparative Example 6 in which the spinning temperature is raised without heating the melt blow nozzle are not reduced in average fiber diameter, and are thinned. could not.

Although the nonwoven fabric obtained from Example 6 had a smaller average fiber diameter than the case where the melt blow nozzle was not heated with infrared rays, the decrease in intrinsic viscosity was small and the heat resistance was also good.
Moreover, the nonwoven fabric obtained from the comparative example 7 which does not heat a melt blow nozzle with infrared rays did not become a thing with a small average fiber diameter. And the nonwoven fabric obtained from the comparative example 8 which heated the spinning temperature without heating a melt blow nozzle with infrared rays did not become a thing with a small average fiber diameter, and the fall of intrinsic viscosity was large and heat resistance was also inferior.

  As described above in detail, the melt blown nonwoven fabric of the example product manufactured by irradiating the melt blow nozzle with infrared rays and increasing the surface temperature of the melt blow nozzle as in the present invention has a small average fiber diameter and a small decrease in intrinsic viscosity. The heat resistance was also good.

DESCRIPTION OF SYMBOLS 1 Extra fine fiber 2 Melt blown nonwoven fabric 3 Winding roll 4 Melt blow nozzle 5a, 5b Air inlet 6a, 6b Infrared irradiation device 7 Infrared 8 Suction 9 Net conveyor 10 Extruder 11 Hopper tank 12 Screw 13 Barrel 14 with heater Polymer pipe 15 Gear pump 16 Motor

Thermoplastic resin softened dissolved Ru discharged from the melt blow nozzle 4 is turned into fine drawn as fibers meltblown at high temperature air, ultrafine fibers 1 next to the diameter of interest, and while being sucked by the suction 8 on the net conveyor 9 The melt-blown nonwoven fabric 2 is randomly captured.

The results of the above examples and comparative examples are shown in Table 1 below.

Claims (2)

A method for producing a non-woven fabric by fiberizing a thermoplastic resin by melt blowing through a melt blow nozzle, and irradiating the melt blow nozzle with infrared rays so that the surface temperature of the melt blow nozzle is 5 to 100 ° C. from the time of non-irradiation. A method for producing a melt blown nonwoven fabric, characterized by heating to a high temperature. The method for producing a melt blown nonwoven fabric according to claim 1, wherein the thermoplastic resin is selected from the group consisting of polyester, polyurethane, polyacryl, polyamide, polyvinyl, polyolefin, and fluorine resins.

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