JP6277465B2 - Manufacturing method of heat-resistant nanofilament web yarn by high-speed winding - Google Patents

Description

The present invention relates to a heat-resistant nanofilament web by high-speed winding and a manufacturing means thereof, and particularly, a simple means for winding up the drawn filament at high speed in a drawing means for irradiating an infrared light beam to perform an ultra-high draw ratio. The heat-resistant nanofilament and the manufacturing method thereof that can obtain a nanofilament web made of filaments having an average heat-resistant filament diameter of less than 1 μm, and the filament web is twisted in a high-speed winding process The present invention relates to a nanofilament yarn having a twist and a manufacturing method thereof.

In recent years, fibers with a fiber diameter of less than 1 μm, that is, in the nanometer (several nanometers to several hundreds nanometers) range, are attracting attention as future innovative materials in a wide range of fields such as IT, biotechnology, and environmental fields. As a means for producing the nanofiber, an electrospinning method (hereinafter sometimes abbreviated as ES method) is typical (US Pat. No. 1,975,504). However, in this ES method, it is necessary to dissolve the polymer in a solvent, and the finished product also needs to be desolvated, so that the production method is complicated, and there is no molecular orientation of the filament. There were many problems in terms of quality, such as small masses of resin called lumps and shots mixed in the aggregate.

The present inventor has invented a means for obtaining ultrafine filaments and non-woven fabrics at a stretch ratio of 1,000 times or more with molecular orientation by infrared luminous flux method (International Publication No. WO2005 / 083165A1 etc.) . These were obtained by simple means to obtain ultrafine molecularly oriented filaments and non-woven fabrics composed thereof. In addition, the inventors have invented a means for producing ultrafine filaments, which has been developed and further enabled to be ultrafine to the nanofilament region (International Publication WO2008 / 084797A1). In the present invention, a large number of original filaments are simultaneously stretched to produce a web, and the inventors' prior invention is suitable for this large number of stretching means (Japanese Patent Laid-Open No. 2010-185162).

US Pat. No. 1,975,504 (page 1-2, FIGS. 1 and 4) International Publication Number WO2005 / 083165A1 (page 1-2, FIGS. 1 and 3) International Publication WO2008 / 084797A1 (page 1-2, Fig. 1-3) JP 2010-185162 (Page 1-2, Fig. 1-2)

The present invention is a further development of the above-mentioned prior application of the present inventor. The object of the present invention is to make the nanofilament web have heat resistance in a compact apparatus. It is in. It is another object of the present invention to provide means for producing a twisted nanofilament yarn by twisting the nanofilament web having heat resistance.

In the present invention, heat resistance is imparted to the nanofilament web that is thinned to the nanofilament region by stretching the original filament. The original filament in the present invention is already manufactured as a filament and wound on a reel or the like. Further, in the spinning process, a melted or melted filament that has become a filament by cooling or solidification is used subsequently in the spinning process, and can be used as the original filament of the present invention. Here, the filament is a substantially continuous fiber, and is distinguished from a short fiber having a length of several millimeters to several tens of millimeters. The original filament is desirably present alone, but it can be used even if it is assembled into several to several tens.

In the present invention, all the filaments drawn are expressed as filaments, but those that belong to the fiber region as a result of drawing are also included. In most cases, the stretched filament in the present invention is stretched for several minutes without being stretched. Therefore, considering the fact that the length of the filament is several meters or more and the filament diameter d is small, it is substantially continuous. In most cases, it can be regarded as a filament. However, depending on conditions, short fibers belonging to the above-mentioned fiber region can also be produced.

The filament in the present invention includes a single filament composed of a single filament and a multifilament composed of a plurality of filaments. In the present invention, an aggregate of nanofilaments is manufactured in a bundle, and this is a nanofilament web.

The raw filament of the present invention includes polyethylene terephthalate, polyester containing aliphatic polyester and polyethylene naphthalate, polyamide including nylon (including nylon 6, nylon 66), polyolefin including polypropylene and polyethylene, polyvinyl alcohol polymer, tetrafluoro It is also applied to heat-resistant polymers such as fluorine-based polymers including ethylene / perfluoroalkyl vinyl ether copolymer (PFA) and polyphenylene sulfide (PPS).

In the present invention, the original filament sent out from the filament sending means is stretched. As the delivery means, various types can be used as long as the filament can be delivered at a constant delivery speed, such as a combination of a nip roller and several stages of driving rollers.

In the present invention, a plurality of (multiple spindles) original filaments fed from the feeding means are drawn at the same time. The term “multiple spindle” means that there are a plurality of filaments or bundles of filaments that act independently. A plurality of lines means two to several hundred.

The multi-filamentary original filaments fed from the filament feeding means are further fed through the orifices by the gas flowing in the running direction of the original filaments. Until the original filament is sent to the orifice through this filament delivery means, it is performed in an atmosphere of P1 atmospheric pressure, and the place kept under the P1 atmospheric pressure is defined as the original filament supply chamber. When P1 is atmospheric pressure, there is no need for an enclosure that keeps the pressure constant. When P1 is under pressure or pressure reduction, an enclosure (room) for maintaining the pressure is required, and a pressure pump or pressure reduction pump is also required. In the present invention, the orifice inlet portion needs to be P1, but the storage portion of the original filament and the delivery portion of the original filament do not necessarily need to be P1 atmospheric pressure. However, since it is cumbersome to provide separate rooms for them, it is preferable that those portions have the same atmospheric pressure.

After the exit of the orifice, it is maintained at P2 atmospheric pressure, and becomes a drawing chamber that is drawn by heating the original filament that has come out of the orifice with an infrared light beam. The original filament is sent through the orifice by the flow of air flowing through the orifice caused by the pressure difference (P1-P2) between the original filament supply chamber at P1 atm and the stretching chamber at P2 atm. When P2 is at atmospheric pressure, an enclosure that keeps the pressure constant is not particularly necessary. However, when P2 is under pressure or pressure reduction, an enclosure (room) is required to maintain the pressure. A vacuum pump is also required.

The difference in pressure between P1 and P2 is P1> P2. As a result of experiments, it was found that P1 ≧ 2P2, more preferably P1 ≧ 3P2, and most preferably P1 ≧ 5P2.

In the present invention, P2 is desirably performed under reduced pressure (pressure less than atmospheric pressure). By doing so, P1 can be carried out at atmospheric pressure, the apparatus can be remarkably simplified, and decompression is a relatively simple means. Furthermore, since air is ejected from the orifice under reduced pressure, it is not disturbed by the air at normal atmospheric pressure, so the ejected air and the accompanying filament are very stable. Is stable and can be stretched to the nanofilament region. A feature of the present invention is that heat resistance is imparted to filaments having an average filament diameter in the nanomicron region by such simple means.

Note that air at room temperature is usually used as P1 or P2. However, heated air is also used when preheating the original filament or when heat-treating the drawn filament. Further, in order to prevent the filament from being oxidized, an inert gas such as nitrogen gas is used, and in the case of preventing the scattering of moisture, a gas containing water vapor or moisture is also used.

In the present invention, the original filament supply chamber and the drawing chamber are connected by an orifice. In the orifice, a high-speed gas flow generated by a pressure difference of P1> P2 is generated in a narrow gap between the original filament and the orifice inner diameter. In order to generate this high-speed gas flow, the inner diameter D of the orifice and the diameter d of the fiber should not be too large. Experimental results show that D> d and D <30d, preferably D <10d, more preferably D <5d and D <2d.

Since high-speed gas flows through the orifice, a structure with low resistance is desirable inside the orifice. The orifices according to the present invention may be used independently of each other, but a large number of orifices may be formed by opening a large number of holes in a plate-like object. A circular cross section inside the orifice is desirable, but when a plurality of filaments are allowed to pass, or when the filament has an oval or tape shape, an oval or rectangular cross section is also used. Further, it is preferable that the orifice entrance is large so that the original filament can be easily introduced and only the exit portion is narrow because the running resistance of the filament can be reduced and the wind speed from the exit of the orifice can be increased.

The orifice in the present invention has a different role from the blower pipe in the case where the pressure difference before stretching by the present inventors is not used. The conventional blower tube has a role of applying a laser to a fixed position of the filament, and has a function of conveying the original filament to the fixed position with as little resistance as possible. The present invention is different from that in that the high-speed rectified gas is generated due to the difference in pressure between the pressure P1 in the original filament supply chamber and the pressure P2 in the drawing chamber. In normal spunbond nonwoven fabric production, tension is applied to the molten filament by air soccer or the like. However, the air soccer in the production of the spunbonded nonwoven fabric and the orifice in the present invention are completely different in operation mechanism and effect. In the spunbond method, the molten filament is fed by a high-speed fluid in the air soccer, and most of the filament diameter is reduced in the air soccer. On the other hand, in the present invention, the solid original filament is sent by the orifice, and the filament does not start to be thinned in the orifice, but is first drawn by being irradiated with the laser beam at the exit from the orifice. In the spunbond method, high-speed fluid is generated by sending high-pressure air into the air soccer. However, the present invention is different in that high-speed fluid in the orifice is generated due to the pressure difference between the rooms before and after the orifice. In addition, the spunbond method is different from the spunbond method in that only an average filament diameter of about 10 μm can be obtained, whereas in the present invention, a great effect that nanofilaments of less than 1 μm can be obtained.

The present invention is characterized in that the original filament is heated and stretched by an infrared light beam. Infrared rays have a wavelength of 0.78 μm to 1 mm, but the C—C bond of the polymer compound is centered on absorption of 3.5 μm, and 0.78 μm to 20 μm is particularly preferable. These infrared rays can be spotted or linearly focused by a mirror or a lens, and a heater called a spot heater or a line heater that narrows the heating area of the original filament can be used. The line heater is suitable when a plurality of original filaments are traveling in parallel.

The infrared light beam of the present invention is particularly preferably laser light. Among these, a carbon dioxide laser with a wavelength of 10.6 μm and a YAG (yttrium, aluminum, garnet) laser with a wavelength of 1.06 μm are particularly preferable. Lasers can narrow the radiation range (light flux) to a small size, and are concentrated on a specific wavelength, so there is little wasted energy.

The original filament sent out from the orifice is heated by the infrared light beam at the exit of the orifice, and the original filament is drawn by the tension applied to the filament by the high-speed fluid from the orifice. “Directly under the orifice” means that the center of the infrared light beam is 30 mm or less, preferably 10 mm or less and 5 mm or less from the tip of the orifice, as a result of experiments. This is because when the filament is separated from the orifice, the original filament swings and does not stay in a fixed position, and cannot be stably captured by the infrared light beam. Further, it is considered that the tension applied to the filament by the high-speed gas from the orifice is weakened by moving away from the orifice, and the stability is also reduced.

The raw filament of the present invention is heated to an appropriate drawing temperature by an infrared beam. The range heated to an appropriate temperature for drawing by the beam is preferably within 4 mm (length 8 mm) in the vertical direction along the filament axial direction at the center of the filament, more preferably 3 mm or less, most preferably 2 mm or less. Is heated. The beam diameter is measured along the axial direction of the traveling filament. In the present invention, it is measured in the axial direction of the original filament. The present invention makes it possible to stretch highly narrowed to a nano region by being rapidly stretched in a narrow region, and to reduce stretch breaks even with ultra-high magnification stretching. It was. When the filament irradiated with the infrared light beam is a multifilament, the center of the filament means the center of the filament bundle of the multifilament.

The drawn filament group of the present invention is wound directly on a winder having a winding beam. The term “directly” means that the film is directly wound around the winding beam without passing through a filament collecting means such as a conveyor. In the present invention, the winding speed of the winder is 1,000 m / min or more, preferably 2,000 m / min or more, and most preferably 3,000 m / min or more. The winding speed is the speed at which the filament is wound on the winding beam. This winding is preferably 1,000 mm or less under the orifice. The present inventor has found that the heat resistance of the wound filament web is improved by performing high-speed winding in this way.

The invention is also characterized in that the filament web to be wound is twisted in the winding process. As the twisting method, conventional twisting means such as a ring twisting machine in ring spinning can be used. As a twisting means particularly effective in the present invention, the present inventor provides a winding means having two rotating shafts. A winder having a take-up reel is installed on a gantry, and a column supporting the take-up reel is provided at a certain distance R from the center C of the gantry. The rotation axis of the take-up reel and the rotation axis of the gantry are arranged in a direction substantially orthogonal to each other by being configured to rotate about the central axis of Twist is applied to the filament web that is being taken up. The term “substantially orthogonal” does not strictly require orthogonality, but means that the angle is orthogonal within a range of several degrees to several tens of degrees. By doing in this way, it became possible to set it as the apparatus which can perform the high-speed winding of a filament web, and the twist to the filament web simultaneously.

An object of the present invention is to produce a heat-resistant nanofilament web by stretching an original filament at an ultrahigh magnification with an infrared beam. The nanofilament in the present invention has a filament diameter of 1 μm or less, and in the present invention, the original filament has a large diameter ranging from about 100 μm to several hundred μm by making the draw ratio 10,000 or more. It is characterized in that nanofilaments having an average filament diameter of less than 1 μm can be obtained even from the original filament. In addition, it is characterized in that a filament web having a higher melting point and having heat resistance can be obtained by winding a web comprising the nanofilament group at a high speed of 1,000 m / min or more.

The draw ratio λ in the present invention is represented by the following formula from the diameter do of the original filament and the diameter d of the filament after drawing. In this case, the density of the filament is calculated as constant. The fiber diameter is measured with a scanning electron microscope (SEM), using an average value of 100 points based on a photograph taken at a magnification of 350 times for the original filament and 1000 times or more for the drawn filament. In the present invention, an original filament having a large diameter in the range of about 100 μm to several 100 μm is used. Therefore, if the original filament having a diameter of 100 μm is drawn to a filament diameter of less than 1 μm, for example, the draw ratio Is over 10,000 times.
λ = (do / d) ²

The drawn filaments in the present invention are characterized by having a uniform filament diameter. The filament diameter distribution was obtained by measuring 100 filament diameters from the above SEM photograph using length measurement software. The average filament diameter is obtained from their arithmetic average. Moreover, the standard deviation was calculated | required from those measured values, and it was set as the scale of filament diameter distribution.

The drawn filament in the present invention is molecularly oriented by being drawn and is also thermally stable. The results of thermal analysis suggest that the nanofilament web of the present invention is improved in heat resistance of the filament by being wound at high speed. Differential thermal analysis (DSC) measurement was performed at a heating rate of 10 ° C./min using a THEM PLUS2 DSC8230C manufactured by Rigaku Corporation. In the polyethylene terephthalate nanofilament web wound at high speed in the present invention, the crystallinity measured by the DSC method is preferably 30% or more, more preferably 32% or more, and 35 % Or more is most preferable.

The improvement in the heat resistance of the nanofilament is also measured by FT-IR (Frieer transform infrared spectrophotometer). In the present invention, an FT / IR 4200 apparatus manufactured by JASCO was used.

The nanofilament web produced by the present invention has a higher melting point and higher heat resistance than the filament produced by the super-stretching in vacuum, which is the invention of the present inventors (Patent Document 3, etc.). It is characterized by improvement. After the filament web is accumulated by winding or other means, the heat resistance of the filament web can be improved by heat treatment or the like. However, since the filament drawing apparatus of the present invention is maintained at a high vacuum, it needs to be as compact as possible. Therefore, it is very preferable in terms of apparatus and process that the heat resistance of the filament web as a product is improved by winding at high speed.

Another feature of the present invention is that a twisted yarn consisting of nanofilament bundles can be produced. By being twisted, the filament web can be handled not only as a single unit, but also as a unity yarn having tensile strength and dimensional stability. In addition, the twisted yarn is swelled overall despite its dimensional stability, resulting in a yarn with a soft texture and heat retention.

The perspective view which shows the example of the nanofilament manufacturing apparatus which has a high-speed winding machine of this invention. The side view which shows the example of the high-speed winding machine of this invention. The side view which shows the other example of the high-speed winding machine of this invention. The external appearance photograph of the PET nanofilament yarn with a twist obtained by this invention. DSC curve of PET filament web obtained by changing the original filament and winding speed.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an example of a nanofilament manufacturing apparatus having a high-speed winder according to the present invention. The original filaments 1a, 1b, 1c,... Are fed out from a state wound around a reel (not shown), fed through a comb, etc., and fed out at a constant speed by a feeding nip roller (not shown), and the orifice 2a. , 2b, 2c,. The steps up to this point in this figure are illustrated in the case where the pressure P1 of the original filament supply chamber is maintained at atmospheric pressure and no special room is required. After the outlets of the orifices 2a, 2b, 2c,. The atmospheric pressure P2 is guided to a vacuum pump (not shown) through the valve 4. The original filaments 1a, 1b, 1c,... Exiting the orifices 2a, 2b, 2c,... Enter the drawing chamber 4 together with high-speed air caused by the pressure difference P1-P2 between the original filament supply chamber and the drawing chamber. Led. The laser beam 6 emitted from the carbon dioxide laser oscillation device 5 is irradiated to the original filaments 1a, 1b, 1c,... Immediately below the orifices 2a, 2b, 2c,. In order to guide the laser beam 6 into the drawing chamber, it passes through a window made of Zn—Se, but this window is omitted in the drawing. The original filaments 1a, 1b, 1c,... Are stretched by the tension applied to the lower filaments by the high-speed air heated by the laser beam 6 and brought about by the pressure difference of P1-P2, and the drawn filaments 7a, 7b are stretched. , 7c,..., And are directly wound on the lower winder 8. The winding machine 8 is composed of a winding beam 10 installed on a gantry 9, and the winding beam 10 is driven by a motor (not shown) to rotate, and the filament stretched on the winding beam 10 is Wrapped into a nanofilament web. In the present invention, the winding speed on the winding beam 10 is 1,000 m / min.

FIG. 2 shows a side view of an example of the high-speed winder of the present invention. A take-up beam 13 is supported by a shaft 14 on a column 12 built on the gantry 11. The shaft 14 is rotated at a high speed by a motor 15. In the present invention, the winding speed on the winding beam 13 is 1,000 m / min or more.

FIG. 3 shows another example of the high-speed winder of the present invention in a side view. A motor 22 is installed in the base frame 21, and the rotation shaft 23 is rotated by the motor 22. The gantry plate 24 is fixed to the base frame 21 with bolts 25a and 25b. However, since the gantry plate 24 and the rotary shaft 23 are installed through a space, the gantry plate 24 is rotated even if the rotary shaft 23 rotates. Does not rotate. Circular rails 26a and 26b made of aluminum are embedded in the gantry plate 24. The rails 26a and 26b are energized, but are insulated from the gantry plate by a rubber material. A rotating disk 27 is connected to the rotating shaft 23, and the rotating disk 27 also rotates as the rotating shaft 23 rotates. The rotating disk 27 is provided with terminals 28a and 28b. Power is supplied from the rails 26a and 26b by metal rollers 29a and 29b provided below the terminals 28a and 28b. A support post 30 is fixed to the rotary disk 27 at a position away from the rotation center C of the rotary shaft 23 by a distance R. A motor 31 is provided on the post 30, and a take-up beam is provided on the rotary shaft 32 of the motor 31. 33 is set, and the winding beam 33 rotates at a high speed as the motor rotates. Power supply to the motor 31 is performed by wirings 34a and 34b from the terminals 28a and 28b. The strut 30 is also provided with a traverse device having a linear motor 36 that reciprocates on the rail 35. The linear motor 36 is provided with a focusing guide 37, and the filament web passes through the ring-shaped focusing guide 37 and is wound while being twisted. Power is supplied to the linear motor 36 from the terminals 28a and 28b, but wiring is omitted in the figure. In this high-speed winder, the rotary shaft 33 of the take-up reel and the rotary shaft 23 of the gantry are arranged in a direction almost perpendicular to each other, so that the filament web that is taken up is twisted. Is added. That is, the rotating shaft 23 and the rotating shaft 32 have two rotation modes, and the filament web is wound around the winding beam 33 by the rotation of the rotating shaft 32, and the winding beam 33 is also rotated by the rotation of the rotating disk 27. Since it rotates around the rotation center C of the shaft 23, the filament web wound around the winding beam 33 is twisted and wound around the winding beam 33 as a twisted filament yarn. FIG. 4 is a photograph showing an example of a polyethylene nanofilament yarn twisted by the apparatus of FIG.

An unstretched polyethylene terephthalate (PET) filament (fiber diameter: 98.3 μm) was used as the original filament, and stretched by the stretching apparatus in FIG. The infrared irradiation apparatus at this time used a carbon dioxide laser oscillation apparatus, and experimented with laser outputs of 30 W and 40 W. The orifice diameter was 0.3 mm. The degree of vacuum in the stretching chamber was adjusted to 30 kPa, 25 kPa, and 20 kPa. The delivery speed of the original filament was 0.1 m / min. FIG. 5 shows the DSC curve of the web obtained by experimenting while changing the winding speed in the case of laser output of 25 W, 30 W, and 40 W. Tables 1, 2 and 3 show the crystallinity (Xc) calculated from the melting point (Tm) and heat of fusion of each web. It can be seen that those having a crystallinity of 30% or more are increased by being wound at a high speed of 10,000 m / min or more. The original filament shows a single melting peak at 256.7 ° C., but in the super-stretching under vacuum of the present invention, it shows a double melting peak, and as the winding speed R increases, it shifts to the high temperature side, and the peak becomes large It becomes remarkable, and it is remarkable at 1,000 m / min or more. In particular, the melting point (Tm2) on the high temperature side when the winding speed R is 4,580 m / min reaches about 277 ° C., which is close to the equilibrium melting point 280 ° C. of PET. Further, the crystallinity (Xc2) of the peak on the high temperature side is increased by winding at high speed. This is particularly noticeable for webs with low crystallinity obtained under conditions with low crystallinity (laser: 30 W, P2: 25 kPa). From the DSC curve of FIG. 5, the melting peak on the high temperature side is different from the melting peak on the low temperature side, and becomes sharper as the winding speed R increases, indicating that the uniformity of the microcrystals is improved. Since the original filament diameter in this example is 98.3 μm and the obtained drawn filament diameter is 0.83 μm or less, the draw ratios of the drawn filaments in the examples all exceed 10,000 times. The filament diameter obtained is about 0.5 μm, and the stretching ratio reaches 38,650 times.

The polyethylene terephthalate web obtained in Example 1 was measured by FT-IR (Fourier transform infrared spectrophotometer) and the results are shown in Table 4. In this measurement, 1340 / cm and 1371 / cm based on the in-plane bending vibration of the ethylene glycol segment are attributed to the transformer and Gauche conformations, respectively. Trans exists in both crystalline and amorphous phases, and Gauche exists only in amorphous. Depending on the ratio of trans / Gauche, the extent of the molecular chain and the degree of crystallinity are estimated. As the winding speed R increases, the trans / Gauche ratio increases and the conformation changes from Gauche to the transformer, indicating that the molecular chain orientation and crystallinity are improved by high-speed winding.

The nanofilament according to the present invention is used not only in fields where conventional ultrafine filaments such as air filters have been used, but also in wide fields as innovative materials such as medical filters and functional materials for IT. Since the production cost is low and the web has heat resistance, a wide application is expected. In addition, the twisted nanofilament yarn according to the present invention is expected to be a swelled and soft fiber for clothing.

1: original filament, 2: orifice, 3: stretching chamber, 4: valve
5: Carbon dioxide laser oscillation device, 6: Laser beam,
7: drawn filament, 8: winder, 9: mount, 10: take-up beam.
11: mount, 12: support, 13: winding beam, 14: shaft, 15: motor.
21: base frame, 22: motor, 23: rotating shaft, 24: mount plate,
25: bolt, 26: rail, 27: rotating plate, 28: terminal, 29: roller,
30: support, 31: motor, 32: rotating shaft, 33: winding beam, 34: wiring,
35: Rail, 36: Linear motor, 37: Focusing guide.

Claims (9)

The original filament delivered by the filament delivery means is supplied to the orifice under P1 atmospheric pressure, and the difference in air pressure before and after the orifice is guided to the extending portion under P2 atmospheric pressure where P1 ≧ 2P2, and in the extending portion A nanofilament with an average filament diameter of less than 1 μm that is heated and stretched by an infrared light beam and is directly wound at a high speed of 1,000 m / min or more directly under the orifice, and has a draw ratio of 10,000 times or more. In a method for producing a heat-resistant nanofilament web by high-speed winding,
A winder having a take-up reel on which the winding is performed is installed on a frame;
A column supporting the take-up reel is provided at a certain distance R from the center C of the gantry,
Further, the gantry is configured to rotate about the center C,
The filament web that is being taken up is twisted by arranging the two rotation axes of the rotation axis of the take-up reel and the rotation axis of the gantry in a substantially orthogonal direction. A method for producing a nanofilament web yarn. The method for producing a heat-resistant nanofilament web yarn according to claim 3, wherein in the stretching, P1 atmospheric pressure is atmospheric pressure and P2 atmospheric pressure is under reduced pressure. The method for producing a heat-resistant nanofilament web yarn according to claim 3, wherein the drawing of the filament is performed at a short distance of 30 mm or less from the outlet of the orifice, and the high-speed winding is performed at 1,000 mm or less from the orifice. The method for producing a heat-resistant nanofilament web yarn according to claim 3, wherein the infrared light beam is heated within a range of up to 4 mm along the axial direction of the filament at the center of the original filament. An original filament supply chamber under P1 atmosphere having an original filament delivery means, an orifice through which the original filament passes, and the original filament supply chamber by the orifice An extension chamber under P2 atmospheric pressure (P1> P2) that is connected and is extended by heating the original filament that has passed through the orifice with an infrared light beam, and an infrared irradiation device that irradiates the infrared light beam. In the nanofilament manufacturing apparatus provided,
A winder having a take-up reel on which a nanofilament web made of filaments having an average filament diameter of less than 1 μm is taken up and a support supporting the take-up reel are installed at a certain distance R from the center C. A gantry configured to rotate about C as an axis;
The rotation axis of the take-up reel and the rotation axis centered on the center C of the gantry are arranged in a substantially perpendicular direction so that the web being taken up is twisted. An apparatus for producing a nanofilament yarn having a twist, characterized in that the apparatus is configured. The apparatus for producing a twisted nanofilament yarn according to claim 8, wherein a difference in air pressure between P1 and P2 before and after the orifice is P1 ≧ 2P2. The apparatus for producing a nanofilament yarn having a twist according to claim 8, wherein the original filament supply chamber is in the atmosphere and the drawing chamber is under reduced pressure. The twist according to claim 8, wherein the center of the light beam from the infrared light beam irradiation device is irradiated to the original filament within 30 mm from the exit of the orifice, and high-speed winding is performed at a distance of 1,000 mm or less from the orifice. An apparatus for producing nanofilament yarns. The twisted nanofilament yarn according to claim 8, wherein the beam from the infrared light beam irradiation device is configured to irradiate a range within 4 mm vertically along the axial direction of the filament at the center of the original filament. Manufacturing equipment.

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