JP2011214177A - Method for producing yarn comprising polymer nanofiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a yarn comprising a polymer nanofiber by which the yarn comprising the polymer nanofiber, and having a strength higher than that produced by a conventional method for producing the yarn comprising the polymer nanofiber can be produced.SOLUTION: The method for producing the yarn 24 comprising the polymer nanofiber includes a first step of producing a yarn comprising the polymer nanofiber constituted of the polymer nanofiber 12 at least a part of the surface of which is covered with a metal, and a second step of increasing the strength of the yarn 24 comprising the polymer nanofiber by subjecting the yarn comprising the polymer nanofiber to a partially bonding treatment of partially bonding the polymer nanofiber 12 constituting the yarn 24 comprising the polymer nanofiber to each other by the metal by heating the yarn comprising the polymer nanofiber while extending the yarn comprising the polymer nanofiber, in this order.

Description

  The present invention relates to a method for producing “yarns composed of polymer nanofibers”. In the present invention, the nanofiber means a fiber having an average diameter of about 1000 nm or less.

  “Threads made of polymer nanofibers” are nanofibers gathered into a thread shape, and have a very large specific surface area and high strength. Therefore, the “thread made of polymer nanofibers” can be used for air cleaning filters, various industrial filters, wiping cloths, diapers, artificial leather, artificial dialysis filters, artificial blood vessels, artificial bones, and the like.

  Conventionally, as a method for producing “yarn made of polymer nanofiber”, the following method for producing “yarn made of polymer nanofiber” is known (for example, see Patent Document 1). FIG. 18 is a view for explaining the apparatus for producing “yarn made of polymer nanofiber” described in Patent Document 1. That is, in the conventional method for producing “yarns composed of polymer nanofibers”, as shown in FIG. 18, polymer nanofibers produced by electrospinning (sometimes referred to as electrospinning) are cut into strips. Thus, a belt-shaped nonwoven fabric made of polymer nanofibers is manufactured. The strip-shaped non-woven fabric is passed through a twisted yarn device and stretched to produce a “yarn made of polymer nanofibers” (continuous filament).

  According to the conventional manufacturing method of “yarns made of polymer nanofibers”, a high-strength non-woven fabric made of polymer nanofibers produced by electrospinning can be used without a separate spinning step. “Threads made of polymer nanofibers” can be produced.

Special Table 2007-518891

  However, in the industrial world, there is a demand for a production method capable of producing a higher-strength “yarn made of polymer nanofibers”.

  Therefore, the present invention provides a “yarn made of polymer nanofiber” that can produce a “yarn made of polymer nanofiber” having higher strength than the conventional method of producing “yarn made of polymer nanofiber”. An object is to provide a manufacturing method.

  As a result of intensive efforts to achieve the above object, the inventors of the present invention produced a "thread made of polymer nanofibers" using polymer nanofibers that are at least partially coated with metal, If the “thread made of polymer nanofibers” is heated while being twisted and stretched to perform a partial bonding process in which the polymer nanofibers are partially bonded to each other by a metal, In the “thread made of polymer nanofiber”, the polymer nanofibers are partially bonded via a metal. For this reason, even when tensile stress is applied, it is difficult for the polymer nanofibers to slip, and as a result, the “polymer nanofibers” having higher strength than the conventional method of producing “threads made of polymer nanofibers”. The present inventors have found that it is possible to produce “a yarn made of” and have completed the present invention.

[1] That is, the method for producing “yarns made of polymer nanofibers” of the present invention comprises “yarns made of polymer nanofibers” composed of polymer nanofibers that are at least partially coated with metal. The first step of manufacturing and heating the “yarn made of polymer nanofiber” while twisting and stretching the “yarn made of polymer nanofiber” to produce the “yarn made of polymer nanofiber” And a second step of increasing the strength of the “thread made of polymer nanofiber” by performing a partial bonding process in which the constituent nanofibers are partially bonded with a metal in this order.

  For this reason, according to the manufacturing method of the “thread made of polymer nanofiber” of the present invention, the “thread made of polymer nanofiber” is made using the polymer nanofiber whose surface is at least partially coated with metal. Since the production and the partial bonding process of partially bonding the polymer nanofibers with metal by heating while twisting and stretching the “thread made of polymer nanofiber”, the partial bond In the “thread made of polymer nanofibers” after the treatment, the polymer nanofibers are partially bonded via a metal. For this reason, even when tensile stress is applied, it is difficult for the polymer nanofibers to slip, and as a result, the “polymer nanofibers” having higher strength than the conventional method of producing “threads made of polymer nanofibers”. It becomes possible to manufacture “a yarn made of”.

  Further, according to the method for producing “yarn made of polymer nanofiber” of the present invention, “yarn made of polymer nanofiber” is heated while twisting and stretching “yarn made of polymer nanofiber”. Therefore, the polymer nanofibers are melted in the whole “thread made of polymer nanofibers” to form threads made of single fibers. Or all of the parts where the polymer nanofibers are in contact with each other, and the “thread made of polymer nanofibers” does not become rigid. Therefore, “the thread made of polymer nanofibers” It is possible to increase the strength of the “thread made of polymer nanofibers” while maintaining the extremely large specific surface area due to the nano-level uneven structure existing in “and the flexibility of the thread made of polymer nanofibers”. It becomes.

  Further, according to the method for producing a “thread made of polymer nanofiber” of the present invention, the metal present on the surface of the polymer nanofiber constituting the “thread made of polymer nanofiber” is a shaft of the polymer nanofiber. The polymer nanofiber itself has a high tensile strength because it is bonded in the direction along the axis. For this reason, in the “thread made of polymer nanofiber” of the present invention, the tensile strength of the polymer nanofiber itself is high even when tensile stress is applied. It becomes possible to produce “yarns made of polymer nanofibers” with higher strength than in the method of producing “yarns”.

  In addition, the surface of the polymer nanofibers that make up the “polymer nanofibers” is coated with metal, which not only increases the strength of the “polymer nanofibers” but also provides high electromagnetic shielding. Properties such as property, high electromagnetic wave absorption, high conductivity, and high heat retention can be imparted to the “thread made of polymer nanofiber”.

  In the method for producing a “thread composed of polymer nanofibers” of the present invention, “partially binding polymer nanofibers to each other with metal” means that the polymer nanofibers are in contact with each other. This refers to bonding a part, not all, with metal. For example, by partially heating a “thread made of polymer nanofibers”, a part of the portions where the polymer nanofibers are in contact with each other may be bonded with a metal, A part of the portions where the polymer nanofibers are in contact with each other may be bonded with a metal by heating the “thread made of fibers” under relatively weak conditions.

  In the method for producing a “thread made of polymer nanofiber” of the present invention, the metal coated on the surface of the polymer nanofiber may be a single element metal or an alloy.

  Preferred examples of the single element metal include aluminum, copper, tin, zinc, nickel, iron, gold, and silver. Preferred examples of the alloy include a copper alloy, an aluminum alloy, a titanium alloy, and an iron alloy.

[2] In the method for producing a “thread made of polymer nanofiber” according to the present invention, the partial binding treatment is performed by a laser irradiation process for irradiating the “thread made of polymer nanofiber” with a laser beam. It is preferable.

  By adopting such a method, by appropriately controlling the irradiation intensity, irradiation range, irradiation position and other irradiation conditions of the laser irradiation, the degree of bonding of the polymer nanofibers to each other by the metal, By adjusting the density, the degree of dispersion of the bonding points, etc., it becomes possible to increase the strength of the “thread made of polymer nanofiber” under appropriate conditions.

[3] In the method for producing a “thread made of polymer nanofiber” according to the present invention, the laser irradiation treatment is performed with a beam spot having a diameter that is not more than twice the average diameter of the “thread made of polymer nanofiber”. It is preferable to use a laser beam focused on.

  By adopting such a method, it is possible to efficiently increase the strength of the “thread made of polymer nanofiber”.

[4] In the method for producing a “thread made of polymer nanofiber” according to the present invention, the laser irradiation treatment is preferably performed while scanning laser light according to a predetermined procedure.

  By adopting such a method, it is possible to increase the strength of the “thread made of polymer nanofiber” under appropriate conditions while scanning the irradiation position of laser irradiation.

  For example, if a laser beam is scanned in a direction along the stretching axis of “polymer nanofiber”, partial bonding treatment can be performed in a direction along the stretching axis of “polymer nanofiber”. It becomes possible.

Further, if two or more “threads made of polymer nanofibers” are arranged in parallel and the laser beam is scanned so as to cross all the “threads made of polymer nanofibers”, two laser beams can be obtained by one laser beam. It becomes possible to perform partial bonding treatment on more than “high-molecular nanofibers”.

[5] In the method for producing a “thread made of polymer nanofiber” of the present invention, the laser irradiation treatment is preferably performed intermittently using pulsed laser light having a predetermined period or duty ratio. .

  By adopting such a method, if the laser irradiation treatment is intermittently performed, it is possible to increase the strength of the “thread made of polymer nanofiber” under appropriate conditions.

  By adjusting the pulse period or duty ratio, in particular, the density of partial bonds formed in the “yarn made of polymer nanofiber” can be adjusted.

  By shortening the period of the pulsed light or increasing the duty ratio and performing laser irradiation, partial coupling can be formed with high density. On the contrary, partial coupling can be formed at low density by increasing the period of the pulsed light and performing laser irradiation with a reduced duty ratio.

[6] In the method for producing “yarn made of polymer nanofiber” of the present invention, the laser irradiation treatment is preferably performed using two or more laser beams.

  By adopting such a method, it becomes possible to irradiate more parts of “yarn made of polymer nanofibers” with laser light. It can be performed more uniformly.

[7] In the method for producing a “yarn made of polymer nanofiber” of the present invention, the metal binding treatment is performed by a hot air irradiation treatment for irradiating the “yarn made of polymer nanofiber” with hot air. Is preferred.

  By adopting such a method, the irradiation intensity, irradiation range, irradiation position, and other irradiation conditions of hot air irradiation are the same as in the case of the method for producing the “polymer nanofiber yarn” described in [2] above. By appropriately controlling the degree to which polymer nanofibers are partially bonded to each other by metal, the density of bond points, the degree of dispersion of bond points, and the like are adjusted under appropriate conditions. It becomes possible to increase the strength of the yarn.

[8] In the method for producing a “yarn made of polymer nanofiber” according to the present invention, the partial bonding treatment is preferably performed by passing the “yarn made of polymer nanofiber” through a ring heater. .

  By adopting such a method as well, by appropriately controlling the temperature of the ring heater, the length of the heating region, the passing speed of the “thread made of polymer nanofiber” and other heating conditions, It is possible to increase the strength of “threads made of polymer nanofibers” under appropriate conditions by adjusting the degree of partial bonding by metal, the density of bonding points, the degree of dispersion of bonding points, etc. .

  The ring-shaped heater includes an electric furnace in which a heater is disposed at a position surrounding a region through which a “polymer nanofiber yarn” passes, and an infrared ray source at a position surrounding a region through which a “polymer nanofiber yarn” passes. A diffusion furnace used for manufacturing an infrared furnace, a semiconductor, etc. can be preferably exemplified.

  The time for the "thread made of polymer nanofiber" to pass through the heating area of the ring heater can also adjust the passing speed of the "thread made of polymer nanofiber" by adjusting the length of the heating area. Or by adjusting both.

[9] In the method for producing a “polymer nanofiber yarn” according to the present invention, the partial binding treatment is performed by collecting light or infrared rays on the “polymer nanofiber yarn”. It is preferable to perform the heat treatment.

  Even by adopting such a method, by appropriately controlling the conditions of the rapid heat treatment, the degree to which the polymer nanofibers are partially bonded to each other by the metal, the density of the bonding points, the degree of dispersion of the bonding points, etc. By adjusting, it is possible to increase the strength of the “thread made of polymer nanofiber” under appropriate conditions.

[10] In the method for producing a “polymer nanofiber yarn” according to the present invention, the partial binding treatment is performed by electromagnetic wave heating treatment in which the “polymer nanofiber yarn” is irradiated with an electromagnetic wave and heated. Preferably it is done.

  Even by adopting such a method, the polymer nanofibers can be bonded to each other by appropriately controlling the irradiation intensity, frequency, irradiation range, irradiation position and other irradiation conditions of electromagnetic wave irradiation using the electromagnetic wave absorption characteristics of the metal. By adjusting the degree of partial bonding by metal, the density of bonding points, the degree of dispersion of bonding points, and the like, it becomes possible to increase the strength of “threads made of polymer nanofibers” under appropriate conditions.

[11] In the method for producing a “yarn made of polymer nanofiber” according to the present invention, the partial bonding treatment is performed by applying an electric current to a metal present in the “yarn made of polymer nanofiber”. It is preferable to carry out by heat treatment.

  Even with this method, polymer nanofibers are partially bonded to each other by appropriately controlling the amount of current flowing through the metal and other current heat treatment conditions using the conductivity of the metal. By adjusting the degree of bonding, the density of bonding points, the degree of dispersion of bonding points, and the like, it becomes possible to increase the strength of “threads made of polymer nanofibers” under appropriate conditions.

[12] In the method for producing a “polymer nanofiber” yarn of the present invention, the first step includes a step of producing a “metal-coated strip-shaped nonwoven fabric”, and passing the strip-shaped nonwoven fabric into a twisted yarn device In this order, it is preferable to include a “thread made of polymer nanofiber” manufacturing step of manufacturing “a thread made of polymer nanofiber” from the belt-shaped nonwoven fabric.

  By adopting such a method, it becomes possible to efficiently produce “threads made of polymer nanofibers” made of polymer nanofibers having a nano-level diameter and containing metal with high productivity.

  Further, when the “thread made of polymer nanofiber” is produced by the method described in [12] above, the metal is present not only on the surface but also inside the “thread made of polymer nanofiber”.

[13] In the method for producing a “thread made of polymer nanofiber” according to the present invention, the production process of the “metal-coated strip-like nonwoven fabric” is performed in a state where a high voltage is applied between the collector and the nozzle. A step of producing a sheet-shaped nonwoven fabric from a polymer material solution or a molten polymer material by electrospinning; a step of cutting the sheet-shaped nonwoven fabric to produce the belt-shaped nonwoven fabric; and a metal on the surface of the belt-shaped nonwoven fabric. It is preferable to include the process of vapor-depositing in this order.

  By adopting such a method, it becomes possible to efficiently produce a strip-shaped nonwoven fabric made of polymer nanofibers having a nano-level diameter with a metal deposited on the surface with high productivity.

[14] In the method for producing a “thread made of polymer nanofiber” according to the present invention, the production process of the “metal-coated strip-like nonwoven fabric” is performed in a state where a high voltage is applied between the collector and the nozzle. A step of producing a sheet-like nonwoven fabric from a polymer material solution or a molten polymer material by electrospinning; a step of depositing a metal on the surface of the sheet-like nonwoven fabric; and cutting the sheet-like nonwoven fabric to form the belt-like nonwoven fabric. The manufacturing steps are preferably included in this order.

  Even with such a method, it is possible to efficiently produce a strip-shaped nonwoven fabric composed of polymer nanofibers having a nano-level diameter with a metal deposited on the surface with high productivity.

[15] In the method for producing “yarns composed of polymer nanofibers” of the present invention, the “metal-coated strip-like nonwoven fabric” is produced by forming a strip-like collector extending in the circumferential direction on the outer peripheral surface of the drum. In the “drum-shaped collector”, electrospinning is performed in a state where a high voltage is applied between the collector and the nozzle, so that the polymer nanofibers are collected on the collector from a polymer material solution or a molten polymer material. It is preferable to include in this order a step of manufacturing the belt-shaped nonwoven fabric made of the polymer nanofibers and a step of depositing metal on the surface of the belt-shaped nonwoven fabric.

  Even with such a method, it is possible to efficiently produce a strip-shaped nonwoven fabric composed of polymer nanofibers having a nano-level diameter with a metal deposited on the surface with high productivity. Moreover, the process of cut | disconnecting a nonwoven fabric becomes unnecessary.

[16] In the method for producing a “yarn made of polymer nanofibers” according to the present invention, the first step includes a step of producing a strip-shaped nonwoven fabric composed of nanofibers, and passing the strip-shaped nonwoven fabric into a twisted yarn device. It is preferable to include in this order a step of producing a “yarn made of polymer nanofibers” from the strip-shaped nonwoven fabric and a step of depositing a metal on the surface of the “yarn made of polymer nanofibers”.

  By adopting such a method as well, it is possible to efficiently produce “yarn made of polymer nanofiber” in which a metal made of polymer nanofiber having a nano-level diameter exists, with high productivity.

  Further, when the “thread made of polymer nanofiber” is produced by the method described in [16] above, the metal is present near the surface of the “thread made of polymer nanofiber”.

[17] In the method for producing a “yarn comprising polymer nanofibers” according to the present invention, the production process of the band-shaped nonwoven fabric is performed by performing electrospinning in a state where a high voltage is applied between the collector and the nozzle. It is preferable to include a step of producing a sheet-like nonwoven fabric from a polymer material solution or a molten polymer material and a step of producing the strip-like nonwoven fabric by cutting the sheet-like nonwoven fabric in this order.

  By setting it as such a method, it becomes possible to manufacture efficiently the strip-shaped nonwoven fabric which consists of a polymer nanofiber of a nano level diameter with high productivity.

[18] In the method for producing “yarns composed of polymer nanofibers” of the present invention, the “metal-coated strip-shaped nonwoven fabric” is produced by forming a strip-shaped collector extending in the circumferential direction on the outer peripheral surface of the drum. In the “drum-shaped collector”, electrospinning is performed in a state where a high voltage is applied between the collector and the nozzle, so that the polymer nanofibers are collected on the collector from a polymer material solution or a molten polymer material. It is preferable to be a step of manufacturing the belt-shaped nonwoven fabric made of the polymer nanofibers.

  By adopting such a method as well, it becomes possible to efficiently produce a strip-shaped nonwoven fabric made of polymer nanofibers having a nano-level diameter with high productivity. Moreover, the process of cut | disconnecting a nonwoven fabric becomes unnecessary.

  According to the manufacturing method of the “thread made of polymer nanofiber” of the present invention, the surface of the polymer nanofiber constituting the “thread made of polymer nanofiber” is coated with a metal, In addition to increasing the strength of `` nanofiber yarns '', properties such as high electromagnetic shielding, high electromagnetic wave absorption, high electrical conductivity, and high heat retention properties can also be imparted to `` polymer nanofiber yarns ''. It becomes.

FIG. 3 is a view for explaining each step in the method for producing “a thread made of polymer nanofibers” according to the first embodiment. FIG. 3 is a view for explaining each step in the method for producing “a thread made of polymer nanofibers” according to the first embodiment. FIG. 3 is a view for explaining each step in the method for producing “a thread made of polymer nanofibers” according to the first embodiment. FIG. 3 is a view for explaining each step in the method for producing “a thread made of polymer nanofibers” according to the first embodiment. It is a figure shown in order to demonstrate the partial combination process in the modification 1. FIG. It is a figure shown in order to demonstrate the partial joint process in the modification 2. FIG. It is a figure shown in order to demonstrate the partial joint process in the modification 3. FIG. It is a figure shown in order to demonstrate the partial joint process in the modification 4. It is a figure shown in order to demonstrate the partial coupling | bonding process in the modification 5. FIG. It is a figure shown in order to demonstrate the partial joint process in the modification 6. FIG. It is a figure shown in order to demonstrate the partial joint process in the modification 7. FIG. It is a figure shown in order to demonstrate the partial joint process in the modification 8. It is a figure shown in order to demonstrate the partial joint process in the modification 9. FIG. FIG. 5 is a view for explaining a method for producing a “yarn made of polymer nanofibers” according to Embodiment 2. FIG. 6 is a view for explaining a method for producing a “thread made of polymer nanofibers” according to Embodiment 3. FIG. 6 is a view for explaining a method for producing a “thread made of polymer nanofibers” according to a fourth embodiment. FIG. 6 is a view for explaining a method for producing a “thread made of polymer nanofibers” according to a fourth embodiment. It is a figure shown in order to demonstrate the manufacturing apparatus of "the thread | yarn consisting of a polymer nanofiber" described in patent document 1. FIG.

  Hereinafter, the manufacturing method of the “thread made of polymer nanofiber” of the present invention will be described based on the embodiments shown in the drawings.

[Embodiment 1]
1-4 is a figure shown in order to demonstrate each process in the manufacturing method of "the thread | yarn which consists of polymer nanofibers" concerning Embodiment 1. FIG. Among these, FIGS. 1-3 are figures shown in order to demonstrate the 1st process in the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" concerning Embodiment 1, and FIG. 4 is for demonstrating a 2nd process. FIG.
FIG. 1A is a view showing a state where a sheet-like nonwoven fabric 14 made of polymer nanofibers 12 is manufactured using an electrospinning apparatus 100, and FIG. FIG. 1C is a diagram showing an enlarged view of a region indicated by reference numeral R1 in FIG. 1B.

FIG. 2 is a diagram showing a metal vapor deposition process for producing a belt-shaped nonwoven fabric 18 by depositing metal on the belt-shaped nonwoven fabric 16, and FIG. 2B is a scan of the belt-shaped nonwoven fabric 16 before the metal is deposited. FIG. 2C is a scanning electron micrograph of the strip-shaped nonwoven fabric 18 after the metal is deposited.
FIG. 3 is a view showing a state in which the band-shaped non-woven fabric 18 on which the metal is deposited is passed through the twisting device 300 to produce the “thread 20 made of polymer nanofiber”.
FIG. 4A is a diagram showing a state in which a partial bonding process is performed by irradiating a laser beam to “a thread 20 made of polymer nanofibers”, and FIG. 4B is a top view of FIG. FIG.

  As shown in FIG. 1 to FIG. 4, the manufacturing method of the “thread composed of polymer nanofibers” according to the first embodiment is a “polymer” composed of polymer nanofibers whose surfaces are at least partially coated with metal. The first step of producing the “nanofiber yarn 20” and the “polymer nanofiber yarn 20” are heated while twisting and stretching the “polymer nanofiber yarn 20” to produce the “polymer In this order, the second step of increasing the strength of the “thread made of polymer nanofiber” by performing a partial bonding process in which the polymer nanofibers constituting the “fiber made of nanofiber” are partially bonded to each other by metal. Including. Hereinafter, according to a manufacturing process, the manufacturing method of "the thread | yarn which consists of polymer nanofibers" concerning Embodiment 1 is demonstrated in detail.

(1) 1st process 1st process is a process of manufacturing "the thread | yarn 20 which consists of a polymer nanofiber" comprised by the polymer nanofiber by which at least one part of the surface was metal-coated. The first step includes a belt-shaped nonwoven fabric manufacturing step for manufacturing the belt-shaped nonwoven fabric 16, a metal vapor deposition step for manufacturing a belt-shaped nonwoven fabric 18 in which a metal is deposited on the belt-shaped nonwoven fabric, and a belt-shaped nonwoven fabric 18 on which a metal is deposited. This is a twisting process for producing “yarn 20 composed of polymer nanofibers” made of polymer nanofibers, at least a part of which is metal-coated, from band-shaped nonwoven fabric 18 by passing it through twisted yarn device 300.

(1-1) Band-shaped nonwoven fabric manufacturing process In the band-shaped nonwoven fabric manufacturing process, the sheet-shaped nonwoven fabric 14 is manufactured from a polymer material solution by performing electrospinning in a state where a high voltage is applied between the collector 108 and the nozzle 106. A process and the process of cut | disconnecting the sheet-like nonwoven fabric 14 and manufacturing the strip | belt-shaped nonwoven fabric 16 are included in this order.

  First, the process of manufacturing the sheet-like nonwoven fabric 14 is performed as follows. That is, as shown in FIG. 1A, the raw material tank 102 provided in the electrospinning apparatus 100 is filled with the polymer material solution 10 that is the raw material of the polymer nanofiber 12, the valve 104 is opened, and the raw material is supplied to the nozzle 106. Make it possible. By applying a high voltage between the nozzle 106 and the collector 108 using the high-voltage power supply 110, the polymer nanofibers 12 are spun into the space between the nozzle 106 and the collector 108, and the space between the nozzle 106 and the collector 108 is reached. The polymer nanofibers 12 are deposited on the collector 108 by the electric field generated in the above, and the sheet-like nonwoven fabric 14 made of the polymer nanofibers 12 is manufactured.

  The thickness of the sheet-like nonwoven fabric 14 is, for example, 5 μm to 50 μm. The average diameter of the polymer nanofiber is, for example, 300 nm to 800 nm. Although not shown, the electrospinning apparatus 100 has a mechanism for continuously winding nanofibers, and a long sheet-like nonwoven fabric 14 is manufactured.

  Polymer materials used as raw materials include polypropylene (PP), polyvinyl acetate (PVAc), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyamide (PA), polyurethane (PUR) Polyvinyl alcohol (PVA), polyacrylonitrile (PAN), polyetherimide (PEI), polycaprolactone (PCL), polylactic acid (PLA), polylactic glycolic acid (PLGA), and the like can be used. What is necessary is just to select an optimal thing according to a use.

  When a sheet-like nonwoven fabric is manufactured using the electrospinning apparatus 100, the voltage applied between the nozzle 106 and the collector 108 varies depending on the distance between the nozzle 106 and the collector 108, the raw material used, etc., but is several kV to several tens kV. is there. What is necessary is just to select an optimal value suitably according to the polymer raw material and the structure of the electrospinning apparatus 100.

  Next, the process of manufacturing the strip-shaped nonwoven fabric 16 is performed as follows. That is, as shown in FIG.1 (b), the sheet-like nonwoven fabric 14 is cut | disconnected to the width | variety of about 1-100 mm, and the strip | belt-shaped nonwoven fabric 16 which can be twisted is manufactured.

(1-2) Metal vapor deposition step Next, as shown in FIG. 2A, the metal vapor deposition step is performed by passing the belt-shaped nonwoven fabric 16 through the vacuum vapor deposition apparatus 200 and the surface of the polymer nanofibers constituting the belt-shaped nonwoven fabric 16. Metal is deposited on the substrate. The metal adheres to the surface of each polymer nanofiber in the form of fine particles having an average particle size of about several tens of nanometers, as shown in FIGS. 2B and 2C, for example. Metal deposition is performed, for example, by resistance heating or electron beam heating. The degree of vacuum, temperature, conveyance speed of the strip-shaped nonwoven fabric 16 and the like are set such that the amount of metal deposited on the strip-shaped nonwoven fabric 16 (thickness: for example, 10 nm to 100 nm) has a predetermined thickness.

(1-3) Twisting Yarn Process The twisting process is a process in which the band-shaped nonwoven fabric 18 on which the metal is deposited is passed through the twisting yarn device 300 to produce “the yarn 18 made of polymer nanofibers” from the band-shaped nonwoven fabric 18. That is, as shown in FIG. 3, a “thread 20 made of polymer nanofibers” can be manufactured by twisting the belt-shaped nonwoven fabric 18 manufactured in the first step using the main twisting yarn device 202, and feeding the yarn “Yarn 20 made of polymer nanofibers” twisted more strongly by feeding the yarn while twisting from the left to the right in FIG. Can be manufactured continuously.

  If the yarn feed speed V1 of the yarn feed device 306 is higher than the yarn feed speed V2 of the yarn feed device 304 when feeding the yarn using the yarn feed devices 304 and 306, “the yarn 18 made of polymer nanofiber”. Can also be stretched.

  In the “thread 20 made of polymer nanofiber” produced in the twisting process, the polymer nanofiber 12 is oriented at an angle of about 30 degrees with respect to the stretching axis of the “thread 20 made of polymer nanofiber”. .

  The diameter of the “yarn made of polymer nanofiber” manufactured in the twisting process is, for example, 10 μm to 2000 μm.

(2) Second step

  The second step is to heat the “polymer nanofiber 20” while twisting and stretching the “polymer nanofiber 20”, and the polymer nanofibers 12 are partially made of metal. This is a step of increasing the strength of the “thread 20 made of polymer nanofiber” by performing a partial bonding process for bonding. Specifically, while twisting and stretching the “yarn 20 made of polymer nanofiber”, a laser beam irradiation device 400 made up of a laser generator 402 and a lens 404 is used to apply laser light to “made of polymer nanofiber made up of. When a predetermined position of the “thread 20” is irradiated, the “thread 20 made of polymer nanofiber” is heated in the portion R3 irradiated with the laser beam, and the temperature of the metal fine particles existing in the R3 region is the nucleus growth of the metal fine particles. (See reference numeral 21 in FIG. 4A), and the polymer nanofibers 12 are partially bonded via a metal (see reference numeral 22 in FIG. 4A). ). In addition, the temperature of the polymer nanofibers 12 existing in the R3 region may be equal to or higher than the glass transition temperature of the polymer nanofibers 12, and the polymer nanofibers 12 may melt to form the bonding point 22.

  On the other hand, in the portion R4 not irradiated with the laser light, the “thread 20 made of polymer nanofibers” is not heated, so the polymer nanofibers 12 are not partially bonded via metal, The polymer nanofibers 12 are not melted to form the bonding point 22.

  When performing partial bonding treatment using laser light, all of the polymer nanofibers present in the portion irradiated with the laser light are bonded via a metal or the polymer nanofiber 12 itself is melted and bonded. Adjust the intensity of the laser light to irradiate so that it does not become a fiber.

  As the laser generator, a semiconductor laser, a gas laser such as a carbon dioxide gas laser or a helium neon laser can be used. What is necessary is just to select according to the wavelength, output, etc. of a laser required for a heating.

  Further, the “yarn 20 made of polymer nanofiber” is stretched by making the yarn feed speed V3 of the yarn feed device 408 faster than the yarn feed speed V4 of the yarn feed device 406.

  In addition, the feeding speed of the “thread made of polymer nanofiber” is, for example, 1 m / min to 30 m / min. The power of the laser beam is 20W to 600W. The temperature of the polymer nanofibers at the site irradiated with the laser light is, for example, 100 ° C to 300 ° C.

  Through the above steps, the “thread 20 made of polymer nanofiber” can be produced.

  According to the manufacturing method of “yarn made of polymer nanofiber” according to the first embodiment, “yarn made of polymer nanofiber” is manufactured using polymer nanofiber whose surface is at least partially coated with metal. In addition, the partial binding treatment is performed by partially heating the “polymer nanofibers” while twisting and stretching and partially bonding the polymer nanofibers with metal. In the subsequent “thread made of polymer nanofibers”, the polymer nanofibers are partially bonded via a metal. For this reason, even when tensile stress is applied, it is difficult for the polymer nanofibers to slip, and as a result, the “polymer nanofibers” having higher strength than the conventional method of producing “threads made of polymer nanofibers”. It becomes possible to manufacture “a yarn made of”.

  In addition, according to the manufacturing method of the “yarn made of polymer nanofiber” according to the first embodiment, the “yarn made of polymer nanofiber” is twisted and stretched while the “yarn made of polymer nanofiber” is twisted and stretched. Since it is supposed to perform partial bonding treatment that heats and polymer nanofibers are partially bonded to each other by metal, the polymer nanofibers are melted in the entire “polymer nanofiber yarn”, and the yarn consists of a single fiber. And all the parts where the polymer nanofibers are in contact with each other are not bonded and the “thread made of polymer nanofibers” is not stiffened. To increase the strength of “threads made of polymer nanofibers” while maintaining the extremely large specific surface area due to the nano-level uneven structure present in “made threads” and the suppleness of “threads made of polymer nanofibers”. Is possible

  Moreover, according to the manufacturing method of the “thread made of polymer nanofiber” according to the first embodiment, the metal present on the surface of the polymer nanofiber constituting the “thread made of polymer nanofiber” is the polymer nanofiber. The polymer nanofibers themselves have high tensile strength because they are also bonded in the direction along the axis. For this reason, in the “thread made of polymer nanofiber” of the present invention, the tensile strength of the polymer nanofiber itself is high even when tensile stress is applied. It becomes possible to produce “yarns made of polymer nanofibers” with higher strength than in the method of producing “yarns”.

  Moreover, according to the manufacturing method of the “thread made of polymer nanofiber” according to Embodiment 1, the surface of the polymer nanofiber constituting the “thread made of polymer nanofiber” is coated with metal. In addition to increasing the strength of “polymer nanofiber yarns”, properties such as high electromagnetic shielding properties, high electromagnetic wave absorption, high electrical conductivity, and high heat retention properties are also imparted to “polymer nanofiber yarns”. It becomes possible to do.

  Furthermore, according to the manufacturing method of the “thread made of polymer nanofiber” according to the first embodiment, a high voltage is applied between the nozzle and the planar collector to perform the electrospinning, so that the polymer material solution or A sheet-shaped nonwoven fabric is manufactured from a molten polymer material, and the sheet-shaped nonwoven fabric is cut to produce a strip-shaped nonwoven fabric. Therefore, a strip-shaped nonwoven fabric composed of polymer nanofibers having a nano-level diameter is highly productive and efficient. It becomes possible to manufacture well.

[Modification 1]
FIG. 5 is a diagram for explaining the partial combining process in the first modification. FIG. 5A is a diagram showing that the laser beam irradiation apparatus 400a is moved perpendicularly to the drawing axis of “the polymer nanofiber yarn 20”, and FIG. 5B is a diagram illustrating FIG. Is a view as seen along the drawing axis of “thread 18 made of polymer nanofiber”.

  In the method for producing “yarn made of polymer nanofiber” according to Modification 1, as shown in FIG. 5, the laser irradiation treatment is performed with a diameter that is twice or less the average diameter of “yarn made of polymer nanofiber”. The laser beam is focused on a beam spot having

  In the second embodiment, the temperature of the polymer nanofiber in the portion irradiated with the laser light is, for example, 100 ° C. to 300 ° C.

  With reference to FIG. 5, a laser beam irradiation method in the first modification will be described. The beam spot diameter d of the laser beam is determined by moving the laser beam irradiation device 400a along a direction perpendicular to the drawing axis of the “thread 20 made of polymer nanofiber” and the lens 404 and “made of polymer nanofiber”. This is done by adjusting the distance D to the thread 20 ".

  The beam spot diameter d decreases as the distance D between the lens 404 and the “thread 20 made of polymer nanofiber” approaches the focal length of the lens 404. On the other hand, as the difference between the distance D and the focal length of the lens 404 (including the case where the distance D becomes larger or smaller than the focal length of the lens 404) increases, the beam spot diameter d increases.

  According to the manufacturing method of the “thread made of polymer nanofiber” according to the first modification, the partial bonding process is performed on the beam spot having a diameter that is not more than twice the average diameter of the “thread 18 made of polymer nanofiber”. Since it is performed using the narrowed laser beam, it is possible to efficiently increase the strength of the “thread made of polymer nanofiber”.

[Modification 2]
FIG. 6 is a diagram for explaining the partial combining process in the second modification. FIG. 6A is a diagram showing that laser irradiation is performed by scanning the laser beam irradiation apparatus 400b along the drawing axis of “the polymer nanofiber yarn 20”, and FIG. It is a figure which shows that the laser irradiation is performed by scanning in the direction perpendicular | vertical to the direction parallel to the extending | stretching axis | shaft of several "the thread | yarn 20 consisting of polymer nanofibers" using the light irradiation apparatus 400b.

  In the method for manufacturing “yarn made of polymer nanofiber” according to Modification 2, as shown in FIG. 6, laser irradiation treatment is performed while scanning laser light according to a predetermined procedure.

  With reference to FIG. 6, the partial combining process in the second modification will be described. As shown in FIG. 6 (a), when the laser beam irradiation device 400b is scanned along the stretching axis of the “thread 20 composed of polymer nanofiber”, the stretching axis of the “thread 20 composed of polymer nanofiber” is observed. Can be partially combined.

  In addition, as shown in FIG. 6B, if the laser light irradiation device 400b is scanned so as to intersect a plurality of “threads 20 made of polymer nanofibers”, a plurality of “ Partial binding treatment can be performed on the yarn 20 "made of polymer nanofibers.

  According to the manufacturing method of the “thread made of polymer nanofiber” according to the second modification, the partial bonding process is performed while scanning the laser beam on the “thread 18 made of polymer nanofiber” according to a predetermined procedure. Therefore, it is possible to increase the strength of the “thread made of polymer nanofiber” under appropriate conditions while scanning the irradiation position of the laser irradiation.

[Modification 3]
FIG. 7 is a diagram for explaining the partial combining process in the third modification. FIG. 7A to FIG. 7C are diagrams showing a state in which pulsed laser irradiation is performed and laser light irradiation is intermittently performed, and FIG. 7D is a time axis showing execution and stop of pulsed laser irradiation. FIG. 7E is a diagram showing the “thread 24 made of polymer nanofibers” after the partial bonding process is performed with the laser irradiation pattern shown in FIG. 7D.

  In the method of manufacturing “yarn made of polymer nanofiber” according to Modification 3, as shown in FIG. 7, laser irradiation treatment is intermittently performed using pulsed laser light having a predetermined period or duty ratio. To do.

  With reference to FIG. 7, the partial combining process in the third modification will be described. As shown in FIG. 7A, a pulsed laser beam is generated from the laser beam irradiation device 400c at time T1 to form the partial coupling process 26. Next, pulse laser beam irradiation is not performed at time T2 (FIG. 7B), and pulse laser beam is generated again at time T3 to form a partial coupling process 26 (FIG. 7C). When the laser irradiation treatment is intermittently performed in a pattern as shown in FIG. 7 (d), “polymer nanofibers in which partial bonding treatment is applied only to the portion irradiated with the pulsed laser light as shown in FIG. A yarn 24 "is produced.

  According to the manufacturing method of the “thread made of polymer nanofiber” according to Modification 3, the partial coupling process is intermittently performed using pulsed laser light having a predetermined period or duty ratio. Therefore, it is possible to increase the strength of the “thread made of polymer nanofiber” under appropriate conditions.

[Modification 4]
FIG. 8 is a diagram for explaining the partial combining process in the fourth modification. FIG. 8 (a) is a diagram showing that laser irradiation is performed with two lasers, FIG. 8 (b) is a diagram of FIG. 8 (a) viewed along the stretching axis, and FIG. FIG. 8C is a diagram showing that laser irradiation is performed with three lasers arranged at an angle of 120 °, and FIG. 8D shows that laser irradiation is performed with four lasers arranged at an angle of 90 °. FIG.

  In the manufacturing method of “yarn made of polymer nanofiber” according to Modification 4, as shown in FIG. 8, the laser irradiation treatment is performed using two or more laser beams.

  With reference to FIG. 8, the partial combining process in the modification 4 will be described. As shown in FIG. 8A and FIG. 8B, the two laser light irradiation devices 400 are arranged on an axis perpendicular to the drawing axis of the “thread 20 made of polymer nanofibers”, thereby “polymer nanofibers”. The fiber 20 "made of fiber can be irradiated with laser light from both sides.

  As shown in FIG. 8C, when the three laser light irradiation devices 400 are arranged at an angle of 120 ° on a plane perpendicular to the stretching axis of the “polymer nanofiber yarn 20”, Laser light can be irradiated from three directions of the yarn 20 ”made of fiber.

  As shown in FIG. 8D, when the four laser light irradiation devices 400 are arranged at an angle of 90 ° on a plane perpendicular to the drawing axis of the “thread 20 made of polymer nanofiber”, “polymer nanofiber” Laser light can be irradiated from the top, bottom, left and right of the drawing axis of the yarn 20 "made of fiber.

  According to the manufacturing method of the “thread made of polymer nanofiber” according to the modification example 4, since the partial bonding process is performed by performing the laser irradiation process using two or more laser beams, the polymer nanofiber It is possible to irradiate more portions of the “yarn made of” with laser light, and to increase the strength of the “yarn made of polymer nanofibers” more uniformly.

[Modification 5]
FIG. 8 is a diagram for explaining the partial combining process in the fifth modification.
In the method for producing “yarn made of polymer nanofiber” according to the modified example 5, as shown in FIG. 8, partial bonding treatment is performed on “yarn 20 made of polymer nanofiber” using a hot gun device 410. The hot air irradiation process for irradiating hot air is performed.

  With reference to FIG. 8, the partial combining process in the fifth modification will be described. While twisting and stretching the “yarn 20 made of polymer nanofiber” by the yarn feeders 406 and 408, the hot air 414 discharged from the hot gun 412 is irradiated to the “yarn 20 made of polymer nanofiber” to generate hot air. Irradiation treatment is performed, and partial bonding treatment of “thread 20 made of polymer nanofiber” is performed.

  The hot gun device 410 further includes an airflow suction device 416 and an airflow suction pump 418, and the hot air irradiation process is performed while sucking the airflow with the airflow suction device 416. The temperature of the hot air 414 is such that when the hot air 414 is irradiated on the “thread 20 made of polymer nanofibers”, the temperature of the metal fine particles attached to the surface of the polymer nanofibers causes nucleation of the metal fine particles. It is preferable to employ a condition that the temperature becomes higher than the temperature and the polymer nanofibers 12 are partially bonded to each other through a metal. It should be noted that a condition is adopted in which the temperature of the polymer nanofibers 12 existing in the R3 region is equal to or higher than the glass transition temperature of the polymer nanofibers 12 and the polymer nanofibers 12 melt to form the bonding point 20. It is also preferable.

[Modification 6]
FIG. 9 is a diagram for explaining the partial combining process in the sixth modification.
In the manufacturing method of “yarn made of polymer nanofiber” according to Modification 6, as shown in FIG. 9, by passing the “yarn made of polymer nanofiber” through the ring-shaped heater 420 in the partial bonding process, Do.

  A partial combining process according to the modified example 6 will be described with reference to FIG. By passing the “thread 20 made of polymer nanofiber” through the ring heater 420 while twisting and stretching the “thread 12 made of polymer nanofiber” by the yarn feeders 406 and 408, The “thread 20 made of molecular nanofiber” is heated, and the partial binding treatment of the “thread 20 made of polymer nanofiber” is performed.

  In addition, the surface temperature of the polymer nanofiber passing through the ring heater is, for example, 100 ° C to 300 ° C.

  As the ring-shaped heater 420, an electric furnace in which a heater 422 is arranged at a position surrounding a region through which “the polymer nanofiber yarn 20” passes is used. In addition, it is also possible to use an infrared furnace in which an infrared source is arranged at a position surrounding a region through which the “yarn made of polymer nanofibers” passes, or a diffusion furnace used in semiconductor manufacturing or the like. It can select suitably according to a use.

  The time for the "thread made of polymer nanofiber" to pass through the heating area of the ring heater can also adjust the passing speed of the "thread made of polymer nanofiber" by adjusting the length of the heating area. Or by adjusting both.

[Modification 7]
FIG. 11 is a diagram for explaining the partial combining process in the seventh modification. FIG. 11A is a diagram illustrating a state in which the partial heat treatment is performed using the rapid heat treatment apparatus 430, and FIG. 11B is a diagram illustrating the internal structure of the rapid heat treatment apparatus 430.

  In the method for producing “yarn made of polymer nanofiber” according to Modification 7, as shown in FIG. 11, the partial bonding process is performed using “rapid heating device 430, and“ yarn 20 made of polymer nanofiber ”. In contrast, the heat treatment is performed by a rapid heating process that collects and irradiates light or infrared rays.

  With reference to FIG. 11, the partial combining process in the modified example 7 will be described. The “thread 20 made of polymer nanofiber” passes through the rapid heating apparatus 430 to heat the “thread 20 made of polymer nanofiber”, and the “bond 20 made of polymer nanofiber” is partially bonded. Processing is performed.

  In addition, the surface temperature of the polymer nanofiber during the rapid heating treatment is, for example, 100 ° C. to 300 ° C.

[Modification 8]
FIG. 12 is a diagram for explaining the partial combining process in the modification 8. In FIG. 12, reference numeral 442 indicates an electromagnetic wave.
In the method for producing “yarn made of polymer nanofiber” according to Modification 8, as shown in FIG. 12, the partial binding process is performed by an electromagnetic wave heating process.

  With reference to FIG. 12, the partial combining process in the modification 8 will be described. By irradiating electromagnetic waves to the “thread made of polymer nanofiber” while twisting and stretching the “thread made of polymer nanofiber”, the “thread 20 made of polymer nanofiber” is heated, A partial bonding process of the thread 20 "made of molecular nanofibers is performed. Even with such a method, the nanofibers constituting the “thread made of polymer nanofibers” can be partially bonded to each other with a metal.

  In addition, the surface temperature of the polymer nanofiber during the electromagnetic wave heat treatment is, for example, 100 ° C. to 300 ° C.

[Modification 9]
FIG. 13 is a diagram for explaining the partial combining process according to the ninth modification.
In the partial bonding process in Modification 9, as shown in FIG. 13, the partial bonding process is performed by a current heating process in which heating is performed by passing a current through a metal present in the “polymer nanofiber yarn 20”. It is said.

  With reference to FIG. 13, the partial combining process in the modification 9 will be described. By using a pair of electrodes 454 for the “yarn made of polymer nanofiber” that has been twisted and stretched, an electric current is passed through the metal present in “yarn 20 made of polymer nanofiber”, thereby “polymer The “yarn 20 made of nanofibers” is heated, and the partial binding treatment of the “yarn 20 made of polymer nanofibers” is performed. Even with such a method, the nanofibers constituting the “thread made of polymer nanofibers” can be partially bonded to each other with a metal.

  In addition, the surface temperature of the polymer nanofiber during the current heat treatment is, for example, 100 ° C. to 300 ° C.

[Embodiment 2]
FIG. 14 and FIG. 15 are diagrams for explaining a method of manufacturing “yarn made of polymer nanofiber” according to the second embodiment. FIG. 14A is a view showing a sheet-like nonwoven fabric manufactured by the electrospinning method, and FIG. 14B is a view showing a state where metal deposition is performed on the sheet-like nonwoven fabric 14. FIG. 15 is a view showing a state in which a sheet-like nonwoven fabric 17 on which metal is deposited is cut.

  As shown in FIG. 14, the manufacturing method of the “thread made of polymer nanofiber” according to the second embodiment uses a sheet-like nonwoven fabric 14 manufactured by an electrospinning method as it is without being cut, and metal deposition is performed. To produce a metal-deposited sheet-like nonwoven fabric 17, and then cut the metal-deposited sheet-like nonwoven fabric 17 to produce a metal-deposited strip-like nonwoven fabric 18, as shown in FIG. It is said.

  Even with such a method, it is possible to efficiently produce a strip-shaped nonwoven fabric composed of polymer nanofibers having a nano-level diameter with a metal deposited on the surface with high productivity.

[Embodiment 3]
In Embodiment 1 described above, the sheet-like nonwoven fabric 14 is once manufactured by the electrospinning method, and the belt-like nonwoven fabric 16 is manufactured by cutting the sheet-like nonwoven fabric 14, but the present invention is limited to this. It is not a thing. For example, the strip-shaped nonwoven fabric 16 may be directly manufactured by an electrospinning method. FIG. 16 is a figure shown in order to demonstrate the strip | belt-shaped nonwoven fabric manufacturing process in Embodiment 3. FIG. 16 (a) and 16 (b) are views when the state of manufacturing the belt-shaped nonwoven fabric 16 using the drum-shaped collector 500 is viewed from different angles, and FIG. 16 (c) is a diagram of the drum-shaped collector 500. It is a figure which shows the manufactured strip | belt-shaped nonwoven fabric 16. FIG.

  In the belt-like nonwoven fabric manufacturing process in the manufacturing method of “polymer nanofiber” according to Embodiment 6, as shown in FIGS. 16 (a) and 16 (b), the outer circumferential surface of the drum is circumferentially arranged as a collector. A drum-shaped collector 500 in which a strip-shaped collector 502 is formed, and electrospinning is performed with a high voltage applied between the collector 502 in the drum-shaped collector 500 and the nozzle 106. The polymer nanofibers 12 are deposited on the belt-like collector 502 from the polymer material solution or the molten polymer material, and as shown in FIG. 16C, the belt-like nonwoven fabric 16 made of the polymer nanofibers 12 is directly manufactured. I am going to do that.

  The belt-shaped nonwoven fabric manufacturing process in Embodiment 6 will be described with reference to FIG. In the “drum-shaped collector 500” shown in FIG. 16A, a plurality of conductive disks 506 are passed through a conductive shaft 504 through a non-conductive disk 508 to stack these disks 506 and 508. Can be manufactured. A shaft 504 extends from the center of the drum-shaped collector 500, and one of the shafts 504 is connected to the motor 512 through a bearing 510. The other side of the shaft 504 is connected to the high-voltage power supply 110 through a connection terminal. The bearing 510 is configured so that the motor 512 and the shaft 504 can be electrically insulated.

  When electrospinning is performed by applying a high voltage between the collector 502 of the drum-shaped collector 500 and the nozzle 106 using the high-voltage power supply 110, the polymer nanofibers 12 are deposited on the collector 502. At this time, as shown in FIG. 16B, electrospinning is performed while rotating the drum-shaped collector 500 at a low speed in the direction of the arrow shown in FIG. Molecular nanofibers 12 are continuously deposited in the circumferential direction. The belt-shaped nonwoven fabric 16 can be continuously produced and recovered by winding the nonwoven fabric composed of polymer nanofibers deposited on the winding drum 518 via the transport rollers 514 and 516 while performing electrospinning. .

  According to the method for producing “yarn made of polymer nanofiber” according to Embodiment 3, it is possible to efficiently produce a strip-shaped nonwoven fabric made of polymer nanofiber having a nano-level diameter with high productivity. Become. Moreover, the process of cut | disconnecting a nonwoven fabric becomes unnecessary.

[Embodiment 4]
FIG. 17 is a view for explaining the method of manufacturing “yarn made of polymer nanofiber” according to the fourth embodiment. And FIG. 17 is a figure which shows a mode that metal vapor deposition is continuously given to "the thread | yarn which consists of polymer nanofibers".

  In the manufacturing method of “yarn made of polymer nanofiber” according to Embodiment 4, first, a belt-shaped nonwoven fabric is manufactured from a sheet-shaped nonwoven fabric 14 manufactured by an electrospinning method, and then this is cut to manufacture a belt-shaped nonwoven fabric. To do. Thereafter, the belt-shaped non-woven fabric is passed through a twisting yarn device to produce “thread 30 made of polymer nanofiber” from the belt-shaped non-woven fabric. Thereafter, a metal is vapor-deposited on the surface of the “polymer nanofiber thread 30” to produce a metal thread “polymer nanofiber thread”. Partially-bonding the nanofibers that make up the “polymer nanofibers” with metal by heating the “polymer nanofiber yarns” while twisting and stretching the yarns made of The second step of increasing the strength of “polymer nanofiber” by performing the treatment is performed.

  Even in such a method, as in the case of the method for producing the “thread made of polymer nanofiber” according to Embodiment 1, the polymer nanofiber whose surface is at least partially coated with metal is used. To produce a “yarn made of polymer nanofibers” and heat the “yarn made of polymer nanofibers” while twisting and stretching to partially bond the polymer nanofibers to each other with a metal. Since the treatment is performed, in the “thread made of polymer nanofibers” after the partial bonding treatment, the polymer nanofibers are partially bonded via metal. For this reason, even when tensile stress is applied, it is difficult for the polymer nanofibers to slip, and as a result, the “polymer nanofibers” having higher strength than the conventional method of producing “threads made of polymer nanofibers”. It becomes possible to manufacture “a yarn made of”.

  In addition, according to the method for producing the “yarn made of polymer nanofiber” according to the fourth embodiment, the “yarn made of polymer nanofiber” is twisted and stretched while the “yarn made of polymer nanofiber” is twisted and stretched. Since it is supposed to perform partial bonding treatment that heats and polymer nanofibers are partially bonded to each other by metal, the polymer nanofibers are melted in the entire “polymer nanofiber yarn”, and the yarn consists of a single fiber. And all the parts where the polymer nanofibers are in contact with each other are not bonded and the “thread made of polymer nanofibers” is not stiffened. To increase the strength of “threads made of polymer nanofibers” while maintaining the extremely large specific surface area due to the nano-level uneven structure present in “made threads” and the suppleness of “threads made of polymer nanofibers”. Is possible

  In addition, according to the method for producing “yarn made of polymer nanofiber” according to Embodiment 4, the metal present on the surface of the polymer nanofiber constituting “yarn made of polymer nanofiber” is polymer nanofiber. The polymer nanofibers themselves have high tensile strength because they are also bonded in the direction along the axis. For this reason, in the “thread made of polymer nanofiber” of the present invention, the tensile strength of the polymer nanofiber itself is high even when tensile stress is applied. It becomes possible to produce “yarns made of polymer nanofibers” with higher strength than in the method of producing “yarns”.

  In addition, according to the method for producing “yarn made of polymer nanofiber” according to Embodiment 4, the surface of the polymer nanofiber constituting “yarn made of polymer nanofiber” is coated with metal. In addition to increasing the strength of “polymer nanofiber yarns”, properties such as high electromagnetic shielding properties, high electromagnetic wave absorption, high electrical conductivity, and high heat retention properties are also imparted to “polymer nanofiber yarns”. It becomes possible to do.

  As mentioned above, although the manufacturing method of "the thread | yarn consisting of polymer nanofiber" of this invention was demonstrated based on said embodiment, this invention is not limited to this, It implements in the range which does not deviate from the summary. It is possible.

  DESCRIPTION OF SYMBOLS 10 ... Polymer raw material solution, 12 ... Polymer nanofiber, 14 ... Sheet-like nonwoven fabric, 16 ... Belt-like nonwoven fabric, 17 ... Metal-coated sheet-like nonwoven fabric, 18 ... Metal-coated belt-like nonwoven fabric, 20 ... "High "Yarn made of molecular nanofibers", 22 ... bonding points, 24 ... "yarn made of polymer nanofibers" partially bonded in the second step, 26 ... region irradiated with laser light, 100 ... electrospinning apparatus , 102 ... Raw material tank, 104 ... Valve, 106 ... Nozzle, 108 ... Collector, 110 ... High-voltage power supply, 200, 200a ... Vacuum deposition apparatus, 204 ... Feeding drum, 206, 208 ... Conveying roller, 210 ... Winding drum 212 ... Resistance heating power source, 300 ... Twist yarn device, 302 ... Main twist yarn device, 304, 306, 406, 408 ... Yarn feed device, 400, 400a, 00b, 400c ... Laser light irradiation device, 402 ... Laser generator, 404 ... Lens, 410 ... Hot gun device, 412 ... Hot gun, 414 ... Hot air, 416 ... Airflow suction device, 418 ... Airflow suction pump, 420 ... Ring heater, 422 ... Heater, 424 ... Power source, 430 ... Rapid heat treatment device, 432 ... Light or infrared ray generator, 434 ... Condenser mirror, 440 ... Electromagnetic wave irradiation device, 442 Electromagnetic wave, 450 ... Current supply device, 452 ... High current current power source 454 ... contacts, 500 ... drum collector, 502 ... collector, 504 ... conductor shaft, 506 ... conductor disk, 508 ... non-conductor disk, 510 ... bearing, 512 ... motor, 514,516 ... for transport Roller, 518 ... Winding drum, d ... Laser beam spot diameter, D ... 304 and the distance between the “thread 18 made of polymer nanofiber”, R1... Enlarged portion of the band-shaped nonwoven fabric 16, R2... The enlarged portion of “thread 18 made of polymer nanofiber”, and R3. Part, R4: Enlarged portion of non-partial coupling processing point, V1: Yarn feeding speed of yarn feeding device 206, V2: Yarn feeding speed of yarn feeding device 208, V3: Yarn feeding speed of yarn feeding device 308, V4: Yarn feeding Yarn feeding speed of the device 306, V5 ... Rotational speed of the yarn feeding device 308, V6 ... Rotational speed of the yarn feeding device 306

Claims (18)

A first step of producing a “thread made of polymer nanofibers” composed of polymer nanofibers, at least a part of which is metal-coated,
While twisting and stretching the “yarn made of polymer nanofiber”, the “yarn made of polymer nanofiber” is heated to make the nanofibers constituting the “thread made of polymer nanofiber” metal And a second step of increasing the strength of the “yarn made of polymer nanofiber” by performing a partial bonding process that partially bonds to each other in this order, “thread made of polymer nanofiber” Manufacturing method. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 1,
The method for producing “yarns made of polymer nanofibers”, wherein the partial bonding treatment is performed by laser irradiation treatment of irradiating the “yarns made of polymer nanofibers” with laser light. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 2,
The laser irradiation treatment is performed using a laser beam focused on a beam spot having a diameter that is not more than twice the average diameter of the “polymer nanofiber yarn”. Yarn "manufacturing method. In the manufacturing method of "the thread | yarn which consists of polymer nanofiber" of Claim 2 or 3,
The method for producing a “thread made of polymer nanofiber”, wherein the laser irradiation treatment is performed while scanning with laser light according to a predetermined procedure. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" in any one of Claims 2-4,
A method for producing a “thread made of polymer nanofibers”, characterized in that the laser irradiation treatment is intermittently performed using pulsed laser light having a predetermined period or duty ratio. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" in any one of Claims 2-5,
The method for producing a “thread made of polymer nanofiber”, wherein the laser irradiation treatment is performed using two or more laser beams. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 1,
The method for producing “yarn made of polymer nanofiber”, wherein the partial bonding treatment is performed by hot air irradiation treatment in which hot air is irradiated to the “yarn made of polymer nanofiber”. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 1,
The method for producing a “thread made of polymer nanofiber”, wherein the partial bonding treatment is performed by passing the “thread made of polymer nanofiber” through a ring heater. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 1,
Production of “yarn made of polymer nanofiber”, wherein the partial binding treatment is performed by rapid heating treatment that collects and irradiates light or infrared rays on the “yarn made of polymer nanofiber”. Method. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 1,
The method for producing a “yarn made of polymer nanofiber”, wherein the partial bonding treatment is performed by an electromagnetic wave heating treatment in which the “yarn made of polymer nanofiber” is irradiated with an electromagnetic wave and heated. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 1,
The method for producing a “thread made of polymer nanofiber”, wherein the partial bonding treatment is performed by a current heating process in which current is applied to a metal existing in the “thread made of polymer nanofiber”. . In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" in any one of Claims 1-11,
The first step includes a step of producing a “metal-coated strip-shaped nonwoven fabric”, and a “polymer” that allows the strip-shaped nonwoven fabric to pass through a twisting yarn device to produce a “thread made of polymer nanofibers” from the strip-shaped nonwoven fabric. A process for producing a “thread made of polymer nanofiber”, which comprises the step of producing a “thread made of nanofiber” in this order. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 12,
The manufacturing process of the “metal-coated strip-shaped nonwoven fabric” is a process for manufacturing a sheet-shaped nonwoven fabric from a polymer material solution or a molten polymer material by performing electrospinning in a state where a high voltage is applied between a collector and a nozzle. Comprising the steps of: cutting the sheet-shaped nonwoven fabric to produce the strip-shaped nonwoven fabric; and depositing a metal on the surface of the strip-shaped nonwoven fabric in this order. Yarn "manufacturing method. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 12,
The manufacturing process of the “metal-coated strip-shaped nonwoven fabric” is a process for manufacturing a sheet-shaped nonwoven fabric from a polymer material solution or a molten polymer material by performing electrospinning in a state where a high voltage is applied between a collector and a nozzle. Comprising the steps of: depositing a metal on the surface of the sheet-like nonwoven fabric; and cutting the sheet-like nonwoven fabric to produce the strip-like nonwoven fabric in this order. Yarn "manufacturing method. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 12,
In the manufacturing process of the “metal-coated strip-shaped nonwoven fabric”, a high voltage is applied between the collector and the nozzle in the “drum-shaped collector” in which a strip-shaped collector extending in the circumferential direction is formed on the outer peripheral surface of the drum. Electrospinning in a state where the polymer nanofibers are deposited on the collector from a polymer material solution or a molten polymer material, and the band-shaped nonwoven fabric made of the polymer nanofibers is manufactured; and And a step of depositing metal on the surface of the belt-like nonwoven fabric in this order. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" in any one of Claims 1-11,
The first step includes a step of manufacturing a strip-shaped nonwoven fabric made of nanofibers, a step of passing the strip-shaped nonwoven fabric through a twisting yarn device to manufacture a “thread made of polymer nanofibers” from the strip-shaped nonwoven fabric, and the “ A process for depositing a metal on the surface of the “yarn made of polymer nanofiber” in this order, and a method for producing “yarn made of polymer nanofiber”. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 16,
The manufacturing process of the strip-shaped nonwoven fabric includes a process of manufacturing a sheet-shaped nonwoven fabric from a polymer material solution or a molten polymer material by performing electrospinning in a state where a high voltage is applied between a collector and a nozzle, and the sheet And a step of producing the belt-shaped nonwoven fabric by cutting the fibrous nonwoven fabric in this order. In the manufacturing method of "the thread | yarn consisting of a polymer nanofiber" of Claim 16,
In the manufacturing process of the strip-shaped nonwoven fabric, electrospinning is performed in a state where a high voltage is applied between the collector and the nozzle in a “drum-shaped collector” in which a strip-shaped collector extending in the circumferential direction is formed on the outer peripheral surface of the drum. Performing the process of depositing the polymer nanofibers on the collector from a polymer material solution or a molten polymer material to produce the belt-shaped nonwoven fabric composed of the polymer nanofibers. A manufacturing method of “thread made of molecular nanofiber”.