JP2012122155A - Apparatus for producing nanofiber and method for producing nanofiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a nanofiber and a method for producing a nanofiber capable of mass-producing nanofiber nonwoven fabrics that have a uniform thickness.SOLUTION: An apparatus for producing a nanofiber 1 includes: a conveyance device 10 that conveys a long sheet W at a prescribed conveyance speed V; an electrospinning apparatus 20 that deposits nanofibers on the long sheet W being conveyed with the conveyance device 10; a thickness measurement device 40 that measures thickness d of the long sheet W on which the nanofibers are deposited by the electrospinning apparatus 20; and a conveyance speed control device 50 that controls the conveyance speed V based on the thickness d measured by the thickness measurement device 40.

Description

  The present invention relates to a nanofiber manufacturing apparatus and a nanofiber manufacturing method.

  Conventionally, nanofibers having uniform physical properties can be manufactured by adjusting spinning conditions in the electrospinning process (for example, presence or absence of suspended matters in the spinning area, distance between nozzle block and collector, collector structure, etc.). There are known nanofiber manufacturing methods (see, for example, Patent Document 1).

  FIG. 15 is a diagram illustrating a nanofiber manufacturing apparatus 900 used in the nanofiber manufacturing method described in Patent Document 1. In FIG. 15, reference numeral 910 indicates a nozzle block, reference numeral 912 indicates a nozzle, reference numeral 920 indicates a blower, reference numeral 922 indicates a wind direction adjusting plate, reference numeral 924 indicates an edge member, and reference numeral 926 indicates an inhaler. Reference numeral 928 indicates a fan, and reference numeral 950 indicates a collector.

  The nanofiber manufacturing method described in Patent Document 1 volatilizes by forming an air flow in a spinning area defined by a blower 920, two edge members 924, and a suction device 926, as shown in FIG. The spinning conditions in the electrospinning process are adjusted by removing solvents and floating impurities.

  According to the nanofiber manufacturing method described in Patent Document 1, it is possible to manufacture nanofibers having uniform physical properties by adjusting the spinning conditions in the electrospinning process, so that the nanofibers have a uniform thickness. It is considered possible to produce nanofiber nonwoven fabrics.

JP 2008-274522 A

  However, even with the nanofiber manufacturing method described in Patent Document 1, in reality, it is not easy to maintain the spinning conditions in the electrospinning process for a long time, so that the nanofiber nonwoven fabric having a uniform thickness The fact is that it is difficult to mass-produce. Such a situation also applies to a nanofiber manufacturing method in which nanofibers are manufactured by a melt blow spinning device or other spinning device.

  Then, this invention is made | formed in view of the above situations, and provides the nanofiber manufacturing apparatus and nanofiber manufacturing method which can mass-produce the nanofiber nonwoven fabric which has uniform thickness. With the goal.

[1] The nanofiber manufacturing apparatus of the present invention includes a transport device that transports a long sheet at a predetermined transport speed, a spinning device that deposits nanofibers on the long sheet transported by the transport device, and the spinning A thickness measurement device that measures the thickness of a long sheet on which nanofibers are deposited by the device, and a conveyance speed control device that controls the conveyance speed based on the thickness measured by the thickness measurement device. It is characterized by that.

  According to the nanofiber manufacturing apparatus of the present invention, since the conveyance speed can be controlled based on the thickness measured by the thickness measuring apparatus, the spinning conditions fluctuate in the electrospinning process for a long time. Even if the thickness fluctuates, it is possible to keep the amount of fluctuation in the specified range by appropriately controlling the conveyance speed accordingly, and as a result, mass production of nanofiber nonwoven fabric with uniform thickness It becomes possible to do.

  For example, if the spinning conditions fluctuate in the direction of decreasing thickness during a long electrospinning process, the thickness is increased by slowing the transport speed and increasing the amount of nanofibers deposited per unit area. Thus, the thickness value can be kept within a predetermined range. Also, if the spinning conditions fluctuate in the direction of increasing thickness in the long electrospinning process, the thickness is reduced by increasing the transport speed and reducing the amount of nanofibers deposited per unit area. Thus, the thickness value can be kept within a predetermined range.

  It is possible to keep the thickness value within a predetermined range by adjusting spinning conditions such as “polymer solution concentration” and “temperature and humidity in the spinning area”. Since it takes a certain time to adjust the spinning conditions in accordance with the variation in thickness, it is difficult to produce a nanofiber nonwoven fabric having a uniform thickness along the longitudinal direction with high productivity.

  In addition, by adjusting spinning conditions such as “interval between nozzle and collector” and “voltage applied between nozzle and collector”, the thickness value can be kept within a predetermined range. In these cases, the physical properties of the nanofiber such as the diameter of the nanofiber and the density of the nanofiber layer vary, and it is difficult to produce a nanofiber nonwoven fabric having uniform physical properties.

  On the other hand, according to the nanofiber manufacturing apparatus of the present invention, a nanofiber nonwoven fabric having a uniform thickness can be obtained by a simple method of controlling the conveyance speed based on the thickness measured by the thickness measuring apparatus. Since mass production is possible, there is no problem that it takes a certain amount of time to adjust the spinning conditions according to the thickness variation, and nanofibers such as nanofiber diameter and nanofiber layer density There is no problem that the physical properties of the material fluctuate.

  In the present invention, the thickness of the long sheet on which nanofibers are deposited refers to the thickness measured when the nanofiber layer deposited on the long sheet and the long sheet are laminated. Thickness. The nanofiber nonwoven fabric refers to a long sheet on which nanofibers are deposited. The nanofiber nonwoven fabric may be used as a product as it is, or a long sheet may be removed from the nanofiber nonwoven fabric to produce a “nonwoven fabric consisting of only a nanofiber layer”, which may be used as a product. The “nanofiber” refers to a fiber made of a polymer and having an average diameter of several nm to several thousand nm. The “polymer solution” refers to a solution in which a polymer is dissolved in a solvent.

[2] In the nanofiber manufacturing apparatus of the present invention, the transport speed control device controls the transport speed based on a deviation amount between a thickness measured by the thickness measuring device and a predetermined target thickness. Is preferred.

  According to the nanofiber manufacturing apparatus of the present invention, for example, when the deviation amount is large, the control amount (change amount from the initial value) of the conveyance speed is increased, and when the deviation amount is small, the conveyance speed is increased. Therefore, it is possible to perform control such as reducing the control amount (change amount from the initial value), and accordingly, it is possible to appropriately control the conveyance speed in accordance with the magnitude of the thickness variation.

  Further, according to the nanofiber manufacturing apparatus of the present invention, for example, when the deviation amount is less than a predetermined value, without changing the transport speed from the initial value, when the deviation amount is a predetermined value or more, Since it is possible to perform control such as changing the transport speed from the initial value, it is possible to simplify the control of the transport speed by the transport speed control device.

[3] In the nanofiber manufacturing apparatus of the present invention, it is preferable that the transport speed control device controls the transport speed in consideration of a time change rate of the deviation amount.

  In this way, by considering the “time change rate of deviation amount”, it is possible to more appropriately control the conveyance speed as compared with the case where the conveyance speed is controlled based only on the deviation amount. For example, when the spinning conditions change suddenly, the time change rate of the deviation amount is large, so the control amount (change amount from the initial value) of the conveyance speed is increased to match it. Further, when the variation amount of the spinning condition is small, the time change rate of the deviation amount is small, so the control amount of the conveyance speed (change amount from the initial value) is reduced to match it.

[4] In the nanofiber manufacturing apparatus of the present invention, the thickness measuring device is disposed so as to face each other with the long sheet sandwiched therebetween, and measures a distance to the long sheet by a triangular distance measuring method. It is preferable that a thickness measuring unit including a laser distance measuring device is provided, and the thickness of the long sheet is calculated based on a distance measured by the pair of laser distance measuring devices.

  By adopting such a configuration, “the distance between one surface of the long sheet and the laser distance measuring device located on the one surface side” and “the other surface of the long sheet and the other surface” It is possible to calculate the thickness of the long sheet using the distance to the laser distance measuring device located on the surface side, so even if the long sheet being conveyed is swung up and down The thickness of the long sheet can be accurately measured.

[5] In the nanofiber manufacturing apparatus of the present invention, the thickness measuring device is guided by a thickness measuring roller that guides the long sheet along a circumferential direction, and the thickness measuring roller. A thickness measuring unit comprising a camera for enlarging and photographing the outermost peripheral part of the long sheet along the conveying direction of the long sheet, and performing image processing on the image photographed by the camera, It is preferable to calculate the thickness.

  By adopting such a configuration, camera photographing is performed at a site where the conveyed long sheet does not swing, so that the thickness of the long sheet can be accurately measured.

[6] In the nanofiber manufacturing apparatus of the present invention, the thickness measuring device is disposed at a different position in the width direction of the long sheet as a thickness measuring unit that measures the thickness of the long sheet. A plurality of thickness measuring units are preferably provided.

  By setting it as such a structure, it becomes possible to measure thickness over the wide area | region of the width direction of a long sheet, and it becomes possible to control conveyance speed more appropriately.

[7] In the nanofiber manufacturing apparatus of the present invention, the transport speed control device controls the transport speed based on an average thickness obtained by averaging the thicknesses measured by the plurality of thickness measuring units. It is preferable to do.

  By adopting such a configuration, even when the thickness is distributed in the width direction of the long sheet, the conveyance speed is controlled more appropriately by controlling the conveyance speed based on the average thickness. It becomes possible to do.

[8] In the nanofiber manufacturing apparatus of the present invention, the thickness measurement device includes a thickness measurement unit that measures the thickness of the long sheet, and the thickness measurement unit in the width direction of the long sheet. It is preferable to include a drive unit that reciprocates along a predetermined cycle along the drive unit.

  Even with such a configuration, the thickness can be measured over a wide area in the width direction of the long sheet as in the case of the nanofiber manufacturing apparatus according to [6] above, and transported more appropriately. The speed can be controlled.

[9] In the nanofiber manufacturing apparatus of the present invention, the transport speed control device sets the thickness measured by the thickness measuring unit to a time corresponding to the predetermined period or n times the period (however, n Is preferably controlled based on an average thickness obtained by averaging with a natural number.

  Even with such a configuration, as in the case of the nanofiber manufacturing apparatus according to [7] above, even if the thickness is distributed in the width direction of the long sheet, the average thickness is reduced. By controlling the conveyance speed based on this, it becomes possible to control the conveyance speed more appropriately.

[10] The nanofiber manufacturing apparatus of the present invention further includes a heating device that is disposed between the spinning device and the thickness measuring device and that heats the long sheet on which the nanofibers are deposited. preferable.

  By adopting such a configuration, it is possible to completely evaporate the solvent that may remain in the nanofiber layer, and thus it is possible to manufacture a high-quality nanofiber nonwoven fabric with extremely little residual solvent. Further, since the thickness can be measured in a state where the solvent is completely evaporated, the thickness can be measured accurately.

[11] In the nanofiber manufacturing apparatus of the present invention, it is preferable that the spinning device includes a plurality of spinning devices arranged in series along a predetermined transport direction in which the long sheet is transported.

  By adopting such a configuration, it becomes possible to deposit nanofibers one after another on a long sheet in each of a plurality of spinning devices, so that a nanofiber nonwoven fabric having a uniform thickness can be further increased in productivity. Enables mass production. In addition, even when mass-producing nanofiber nonwoven fabrics in which various types of nanofibers are sequentially deposited on a long sheet, it is possible to mass-produce nanofiber nonwoven fabrics having a uniform thickness with even higher productivity. Become. In addition, even in a nanofiber manufacturing apparatus including a plurality of spinning devices, a nanofiber nonwoven fabric having a uniform thickness can be obtained by controlling the conveying speed instead of adjusting the spinning conditions in each of the plurality of spinning devices. Can be mass-produced.

[12] In the nanofiber manufacturing apparatus of the present invention, the spinning device is preferably an electrospinning device.

  By adopting such a configuration, a nanofiber having a uniform thickness even in a nanofiber production apparatus including an electrospinning apparatus capable of producing nanofibers having an extremely thin diameter (several nm to several thousand nm) as a spinning apparatus. It becomes possible to mass-produce fiber nonwoven fabrics.

[13] The nanofiber manufacturing method of the present invention measures the thickness of the long sheet on which the nanofibers are deposited while depositing nanofibers on the long sheet that is being transported at a predetermined transport speed, The conveying speed of the long sheet is controlled based on the thickness of the long sheet.

  According to the nanofiber manufacturing method of the present invention, the thickness of a long sheet on which nanofibers are deposited is measured, and the conveyance speed of the long sheet is controlled based on the thickness. Even if the spinning conditions fluctuate in the spinning process and the thickness fluctuates, it is possible to keep the fluctuation amount of the thickness within a predetermined range by appropriately controlling the conveying speed accordingly, and as a result It becomes possible to mass-produce nanofiber nonwoven fabric having a thickness.

  According to the nanofiber production apparatus or nanofiber production method of the present invention, high-function / high-sensitivity textiles and other clothing items, health care, skin care and other beauty-related products, wiping cloth, filters and other industrial materials, secondary battery separators, Capacitor separators, various catalyst supports, electronic and mechanical materials such as various sensor materials, regenerative medical materials, biomedical materials, medical MEMS materials, medical materials such as biosensor materials, and other nanofibers that can be used in a wide range of applications Can be manufactured.

It is a figure shown in order to demonstrate the nanofiber manufacturing apparatus 1 which concerns on embodiment. It is a principal part enlarged view of the electrospinning apparatus 20 in embodiment. It is a figure shown in order to demonstrate the thickness measuring apparatus 40. FIG. It is a top view shown in order to demonstrate the motion of the thickness measurement part 42. FIG. It is a flowchart shown in order to demonstrate a nanofiber manufacturing method. It is a graph showing the time change of thickness d, average thickness <d>, and conveyance speed V. FIG. 10 is a graph showing a change over time in thickness d, average thickness <d>, and conveyance speed V in Modification 1. It is a flowchart shown in order to demonstrate the nanofiber manufacturing method in the modification 2. 12 is a graph showing a change with time in thickness d, average thickness <d>, and conveyance speed V in Modification 2. It is a front view of the nanofiber manufacturing apparatus 2 which concerns on Embodiment 2. FIG. It is a figure shown in order to demonstrate the thickness measuring apparatus 40a in Embodiment 2. FIG. It is a figure shown in order to demonstrate the principle which calculates the thickness of the elongate sheet | seat W by the thickness measurement part 42a. It is a figure shown in order to demonstrate the motion of the thickness measurement part 42b in Embodiment 3. FIG. It is a principal part enlarged view of the electrospinning apparatus 20a. It is a figure shown in order to demonstrate the nanofiber manufacturing apparatus 900 used for the nanofiber manufacturing method described in patent document 1. FIG.

  Hereinafter, the nanofiber manufacturing apparatus and nanofiber manufacturing method of the present invention will be described based on the embodiments shown in the drawings.

[Embodiment 1]
1. Configuration of Nanofiber Manufacturing Apparatus 1 According to Embodiment 1 FIG. 1 is a diagram for explaining a nanofiber manufacturing apparatus 1 according to an embodiment. FIG. 1A is a front view of the nanofiber manufacturing apparatus 1, and FIG. 1B is a plan view of the nanofiber manufacturing apparatus 1. In FIG. 1, the polymer solution supply unit and the polymer solution recovery unit are not shown. Further, in FIG. 1A, some members are shown in an enlarged view of a main part. FIG. 2 is an enlarged view of a main part of the electrospinning apparatus 20 according to the embodiment. FIG. 3 is a diagram for explaining the thickness measuring device 40. FIG. 3A is a block diagram showing the relationship among the thickness measuring device 40, the conveyance speed control device 50, and the conveyance device 10, and FIG. 3B is a diagram showing the configuration of the thickness measuring unit 42. FIG. 4 is a plan view for explaining the movement of the thickness measuring unit 42.

  As shown in FIG. 1, the nanofiber manufacturing apparatus 1 according to the first embodiment includes a transport device 10 that transports a long sheet W at a predetermined transport speed V, and a long sheet W that is transported by the transport device 10. The electrospinning device 20 for depositing nanofibers, the thickness measuring device 40 for measuring the thickness d of the long sheet W on which nanofibers are deposited by the electrospinning device 20, and the thickness measured by the thickness measuring device 40. A transport speed control device 50 that controls the transport speed V based on the distance d.

  The nanofiber manufacturing apparatus 1 according to Embodiment 1 includes four electrospinning apparatuses 20 arranged in series along a predetermined conveyance direction a along which a long sheet W is conveyed as an electrospinning apparatus.

  The nanofiber manufacturing apparatus 1 according to Embodiment 1 is disposed between the electrospinning apparatus 20 and the thickness measuring apparatus 40, and a heating apparatus 30 that heats the long sheet W on which nanofibers are deposited, and a long sheet. Is further provided with a main control device 60 for controlling the conveying speed of the VOC and a VOC processing device 70 for burning and removing volatile components.

The conveying device 10 includes a feeding roller 11 that feeds out the long sheet W, a winding roller 12 that winds up the long sheet W, auxiliary rollers 13 and 18 and a driving roller 14 that are positioned between the feeding roller 11 and the winding roller 12. , 15, 16, and 17 are provided.
Feed roller 11, take-up roller 12 and drive rollers 14, 15, 16, 17
Is configured to be rotated by a drive motor (not shown).

  As shown in FIG. 2, the electrospinning apparatus 20 is attached to the housing 100 via an insulating member, and is provided with a collector 150 positioned on one side of the long sheet W and the other side of the long sheet W. A nozzle block 110 having a plurality of nozzles, which are located at positions facing the collector 150 and discharge a polymer solution supplied from a polymer solution supply unit (not shown) toward the long sheet W, and the collector 150 and the nozzle block 110. And a power supply device 160 that applies a high voltage (for example, 10 kV to 80 kV) and an auxiliary belt device 170 that assists in conveying the long sheet W. The positive electrode of the power supply device 160 is connected to the collector 150, and the negative electrode of the power supply device 160 is connected to the nozzle block 110 via the housing 100.

  As shown in FIG. 2, the nozzle block 110 has a plurality of upward nozzles that discharge the polymer solution upward from the discharge ports as a plurality of nozzles. The nanofiber manufacturing apparatus 1 discharges the polymer solution from the discharge ports of the plurality of upward nozzles while overflowing the polymer solution from the discharge ports of the plurality of upward nozzles, and electrospins the nanofibers. The polymer solution overflowed from the discharge port is collected and can be reused as a raw material for nanofibers. The plurality of upward nozzles 112 are arranged at a pitch of 1.5 cm to 6.0 cm, for example. The number of the plurality of upward nozzles 112 is, for example, 36 (6 × 6 when arranged in the same vertical and horizontal direction) to 21904 (148 × 148 when arranged in the same vertical and horizontal number). In addition, the nanofiber manufacturing apparatus of the present invention can use nozzle blocks having various sizes and various shapes. For example, the nozzle block 110 has a side of 0.5 m to 3 m when viewed from above. It has a size and shape that can be seen as a rectangle (including a square).

  As shown in FIG. 2, the auxiliary belt device 170 includes an auxiliary belt 172 that rotates in synchronization with the conveyance speed of the long sheet W, and five auxiliary belt rollers 174 that assist the rotation of the auxiliary belt 172. Of the five auxiliary belt rollers 174, one or more auxiliary belt rollers 174 are drive rollers, and the remaining auxiliary belt rollers are driven rollers. Since the auxiliary belt 172 is disposed between the collector 150 and the long sheet W, the long sheet W is smoothly conveyed without being attracted to the collector 150 to which a positive high voltage is applied. become.

  The heating device 30 is disposed between the electrospinning device 20 and the thickness measuring device 40 and heats the long sheet W on which nanofibers are deposited. Although heating temperature changes with kinds of elongate sheet W and nanofiber, elongate sheet W can be heated to the temperature of 50 to 300 degreeC, for example.

  As shown in FIG. 3A, the thickness measuring device 40 controls the three thickness measuring units 42 and the operations of the three thickness measuring units 42, and measures the three thickness measuring units 42. And a main body 41 having a function of calculating the thickness of the long sheet based on the measured distance. The thickness measuring device 40 transmits information on the thickness measured by the thickness measuring unit 42 to the transport speed control device 50. The conveyance speed control device 50 controls the conveyance speed V of the long sheet W when the conveyance apparatus 10 conveys the long sheet W based on the received information regarding the thickness.

As shown in FIG. 3B, the thickness measuring unit 42 is disposed so as to face each other with the long sheet W interposed therebetween, and a pair of laser distance measuring units that measure the distance to the long sheet W by a triangular distance measuring method. It consists of devices 43 and 44. The laser distance measuring devices 43 and 44 are provided with a laser diode 45, a light projecting lens 46 for projecting laser light emitted from the laser diode, and a light projecting from the light projecting lens 46. A light receiving lens 47 that receives the laser light reflected by the light receiving surface 47, and a light receiving circuit 48 that includes a CCD element that receives the laser light received by the light receiving lens 47. At this time, since the position of the beam spot formed on the light receiving circuit 48 varies depending on the distances L ₁ and L ₂ to the surface (one surface or the other surface) of the long sheet W, the variation amount is read. Thus, the distances L ₁ and L ₂ can be measured. The thickness d of the long sheet W can be calculated by the relational expression “d = L ₃ − (L ₁ + L ₂ )” when the distance between the pair of laser distance measuring devices 43 and 44 is L _3. it can.

  As shown in FIG. 4, the thickness measuring device 40 has a plurality of different positions in the width direction of the long sheet W (the central portion and the left end in the width direction of the long sheet W) as the three thickness measurement units 42 described above. 3 and the right end portion).

  The thickness measuring device 40 can also transmit the value of the measured thickness d as it is to the conveyance speed control device 50, and can be obtained by averaging the thickness d measured by the three thickness measuring units 42. The value of the average thickness <d> can be transmitted to the conveyance speed control device 50.

  The conveyance speed control device 50 controls the conveyance speed V of the long sheet W conveyed by the conveyance device 10 based on the thickness d or the average thickness <d> measured by the thickness measurement unit 40. For example, when the spinning conditions fluctuate in the direction in which the thickness d decreases in the long-time electrospinning process, the thickness is increased by slowing the conveying speed V and increasing the amount of nanofibers deposited per unit area. Make it thicker. On the other hand, when the spinning conditions fluctuate in the direction of increasing the thickness in the electrospinning process for a long time, the thickness is reduced by increasing the conveyance speed and reducing the amount of nanofibers deposited per unit area. The conveyance speed V can be controlled by controlling the rotation speed of the drive rollers 14, 15, 16, and 17.

  The main controller 60 controls operations of the transport device 10, the electrospinning device 20, the heating device 30, the thickness measuring device 40, the transport speed control device 50, the VOC processing device 70, the polymer supply device, and the polymer recovery device.

  The VOC processing device 70 burns and removes volatile components generated when nanofibers are deposited on the long sheet.

2. Nanofiber manufacturing method using nanofiber manufacturing apparatus 1 according to Embodiment 1 Hereinafter, a method of manufacturing a nanofiber nonwoven fabric using nanofiber manufacturing apparatus 1 according to Embodiment 1 configured as described above (Embodiment 1) Will be described.

FIG. 5 is a flowchart shown for explaining the nanofiber manufacturing method according to the first embodiment. FIG. 6 is a graph showing temporal changes in the thickness d, the average thickness <d>, and the conveyance speed V. 6A is a graph showing the time change of the thickness d, FIG. 6B is a graph showing the time change of the average thickness <d>, and FIG. 6C is the time of the conveyance speed V. It is a graph showing a change. 6 (a) and 6 in (b), reference numeral D ₀ denotes the target thickness, reference numeral D _H denotes the maximum thickness permitted, code D _L denotes the lower limit of the thickness to be acceptable . In FIG. 6C, the symbol V ₀ indicates the initial value of the conveyance speed.

  As shown in FIG. 5, the nanofiber manufacturing method according to Embodiment 1 includes “target thickness setting”, “long sheet conveyance / electrospinning”, “thickness measurement”, “average thickness calculation”, “deviation” Each step of “conveying speed control” of “calculation of amount Δd” is included.

1. Target thickness setting (S10)
Setting the thickness of the nanofiber nonwoven fabric produced as the target thickness d _0.

2. Long sheet conveyance / electrospinning (S12)
The long sheet W is set on the conveying device 10, and then the long sheet W is conveyed at a predetermined conveying speed V from the feeding roller 11 toward the take-up roller 12, and the long sheet W is used in each electrospinning device 20. The nanofibers are sequentially deposited on the substrate. Thereafter, the heating device 30 heats the long sheet W on which the nanofibers are deposited. Thereby, the nanofiber nonwoven fabric which consists of a elongate sheet | seat with which nanofiber was accumulated is manufactured.

  At this time, according to the following procedure, the thickness of the long sheet W on which nanofibers are deposited by the electrospinning device 20 is measured, and the conveyance speed V is set based on the thickness d measured by the thickness measuring device 40. Control. In the first embodiment, as shown in FIGS. 6A to 6C, the conveyance speed is not controlled for the period before the time t has elapsed, and the conveyance speed is not used for the period after the time t has elapsed. It is going to be controlled. The same applies to Modifications 1 and 2 below.

3. Thickness measurement (S14)
First, as shown in FIG. 4, the thickness of the long sheet W is measured by the three thickness measuring units 42. The thickness measurement by the thickness measuring unit 42 is performed every 10 ms, for example. As a result, a graph as shown in FIG.

4). Average thickness calculation (S16)
Next, the average thickness <d> is calculated by averaging the thickness d measured by the three thickness measuring units 41. As a result, a graph as shown in FIG. 6B is obtained.

5. Deviation amount Δd calculation (S18)
Next, a deviation amount Δd between the above average thickness <d> and a predetermined target thickness d ₀ is calculated.

6). Conveyance speed control (S20 to S26)
Next, the transport speed V is controlled based on the deviation amount Δd.
For example, when the spinning conditions fluctuate in the direction of decreasing the thickness d in the long-time electrospinning process (when the shift amount Δd is negative), the transport speed V is decreased to deposit nanofibers per unit area. The thickness d is increased by increasing the amount. On the other hand, when the spinning conditions fluctuate in the direction of increasing thickness in the long-time electrospinning process (when the shift amount Δd is positive), the transport speed V is increased to increase the nanofiber deposition amount per unit area. To reduce the thickness (see FIG. 6C). Thus, after the time t elapses, and gradually the thickness d converge to the value of the predetermined target thickness d _0.

  The spinning conditions in the nanofiber manufacturing method according to Embodiment 1 will be exemplified below.

  As the long sheet, non-woven fabrics, woven fabrics, knitted fabrics, and films made of various materials can be used. For example, a long sheet having a thickness of 5 μm to 500 μm can be used. The length of the long sheet can be, for example, 10 m to 10 km.

  Examples of the polymer used as a raw material for the nanofiber include polylactic acid (PLA), 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 glycolic acid (PLGA), silk, cellulose, chitosan, etc. Can be used.

  Examples of the solvent used in the polymer solution include dichloromethane, dimethylformamide, dimethyl sulfoxide, methyl ethyl ketone, chloroform, acetone, water, formic acid, acetic acid, cyclohexane, and THF. A plurality of types of solvents may be mixed and used. The polymer solution may contain an additive such as a conductivity improver.

  The thickness d of the nanofiber nonwoven fabric to be manufactured can be set to, for example, 1 μm to 100 μm. The conveyance speed V can be set to 0.2 m / min to 100 m / min, for example. The voltage applied to the nozzle, collector 150 and nozzle block 110 can be set to 10 kV to 80 kV, and is preferably set to around 50 kV.

  The temperature of the spinning zone can be set at 25 ° C., for example. The humidity of the spinning area can be set to 30%, for example.

3. Effect of Nanofiber Manufacturing Apparatus 1 According to Embodiment 1 According to the nanofiber manufacturing apparatus 1 according to Embodiment 1, thickness measurement is performed to measure the thickness d of the long sheet W on which nanofibers are deposited by the spinning device 20. Since the apparatus 40 and the conveyance speed control apparatus 50 that controls the conveyance speed V based on the thickness d measured by the thickness measurement apparatus 40 are provided, the apparatus 40 is based on the thickness d measured by the thickness measurement apparatus 40. It becomes possible to control the conveyance speed V. For this reason, even if the spinning conditions fluctuate and the thickness fluctuates in the long-time electrospinning process, the thickness fluctuation amount can be kept within a predetermined range by appropriately controlling the conveying speed accordingly. As a result, the nanofiber nonwoven fabric having a uniform thickness can be mass-produced.

Further, according to the nanofiber manufacturing apparatus 1 according to Embodiment 1, the thickness d measured by the thickness measuring device 40, the conveying speed V on the basis of the deviation amount Δd of a predetermined target thickness d ₀ control to, for example, when the displacement amount Δd is large, increases the control amount of the conveyance speed V (the amount of change from the initial value V _0), if the deviation amount Δd is small, control of the conveying speed V the amount it is possible to control such that small (the amount of change from the initial value V _0), it is possible to properly control the conveying speed according to the degree of variation in thickness.

  Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1, the thickness measurement apparatus 40 is three thickness measurement parts arrange | positioned as a thickness measurement part in the different position in the width direction of the elongate sheet W. Therefore, the thickness can be measured over a wide area in the width direction of the long sheet, and the conveyance speed can be controlled more appropriately.

  Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1, the conveyance speed control apparatus 50 average thickness <d> obtained by averaging the thickness d measured by the three thickness measurement parts 40. Therefore, even if the thickness d is distributed in the width direction of the long sheet W, the conveyance speed V is set based on the average thickness <d>. By controlling, it becomes possible to control the conveyance speed more appropriately.

  Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1, the heating apparatus 30 which is arrange | positioned between the electrospinning apparatus 20 and the thickness measurement apparatus 40, and heats the elongate sheet | seat W on which the nanofiber was deposited is provided. Furthermore, since it is possible to completely evaporate the solvent that may remain in the nanofiber layer, it is possible to manufacture a high-quality nanofiber nonwoven fabric with extremely little residual solvent. Further, since the thickness can be measured in a state where the solvent is completely evaporated, the thickness can be measured accurately.

  Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1, as the electrospinning apparatus, the several electrospinning apparatus 20 arrange | positioned in series along the predetermined conveyance direction a along which the elongate sheet W is conveyed is included. Therefore, nanofibers can be deposited one after another on the long sheet W in each of the plurality of electrospinning apparatuses 20, and a nanofiber nonwoven fabric having a uniform thickness can be mass-produced with higher productivity. Is possible. In addition, when mass-producing nanofiber nonwoven fabrics in which various types of nanofibers are sequentially deposited on the long sheet W, it is possible to mass-produce nanofiber nonwoven fabrics having a uniform thickness with even higher productivity. It becomes. Further, even in a nanofiber manufacturing apparatus including a plurality of electrospinning apparatuses 20, a uniform thickness can be obtained only by controlling the conveying speed V instead of adjusting the spinning conditions in each of the plurality of electrospinning apparatuses 20. It becomes possible to mass-produce nanofiber nonwoven fabrics having

  Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1, it is a nanofiber manufacturing apparatus provided with the electrospinning apparatus which can manufacture the nanofiber which has a very thin diameter (several nm-several thousand nm) as a spinning apparatus. However, it is possible to mass-produce nanofiber nonwoven fabrics having a uniform thickness.

  According to the nanofiber manufacturing method according to the first embodiment, nanofibers are deposited on the long sheet W being conveyed at a predetermined conveyance speed V, and the thickness d of the long sheet W on which the nanofibers are deposited is measured. However, since the conveyance speed V of the long sheet W is controlled based on the thickness d of the long sheet W, even if the spinning conditions fluctuate in the long-time electrospinning process, the thickness varies. By appropriately controlling the conveyance speed accordingly, it becomes possible to keep the amount of variation in thickness within a predetermined range, and as a result, it becomes possible to mass-produce nanofiber nonwoven fabrics having a uniform thickness .

[Modification 1]
FIG. 7 is a graph showing temporal changes in the thickness d, the average thickness <d>, and the conveyance speed V in the first modification. FIG. 7A is a graph showing the time change of the thickness d, FIG. 7B is a graph showing the time change of the average thickness <d>, and FIG. It is a graph showing a change. In FIG. 7A and FIG. 7B, the symbol d ₀ indicates the target thickness, the symbol d _H indicates the upper limit of the allowable thickness, and the symbol d _L indicates the lower limit of the allowable thickness. . In FIG. 7C, reference numeral V ₀ indicates an initial value of the conveyance speed.

In the first modification, as can be seen from FIG. 7C, the transport speed V is controlled in steps. Thus, even when the conveyance speed V is controlled stepwise, as shown in FIGS. 7A and 7B, the thickness d and the average thickness are the same as in the first embodiment. It is it is possible to converge to the target thickness d ₀ a <d>.

[Modification 2]
FIG. 8 is a flowchart for explaining the nanofiber manufacturing method according to the second modification. FIG. 9 is a graph showing changes over time in the thickness d, the average thickness <d>, and the conveyance speed V in the second modification. 9A is a graph showing the time change of the thickness d, FIG. 9B is a graph showing the time change of the average thickness <d>, and FIG. 9C is the time of the conveyance speed V. It is a graph showing a change. 9 (a) and 9 in (b), reference numeral d ₀ indicates the target thickness, reference numeral d _H represents the upper limit of the thickness is allowed, the code d _L represents the lower limit of the thickness to be acceptable The symbol d _H1 indicates the upper control start thickness, and the symbol d _L1 indicates the lower control start thickness. In FIG. 9C, the symbol V ₀ indicates the initial value of the conveyance speed.

In the nanofiber manufacturing method according to the modified example 2, as can be seen from FIGS. 8 and 9, when the average thickness <d> is thicker than the upper control start thickness d _H1 or the lower control start thickness. if it becomes lower than d _L1, controls the conveying speed V (varying from the initial value) is set to be. Even in the case of performing such control, as shown in FIGS. 9A and 9B, the thickness d and the average thickness <d> are set to the target thickness as in the case of the first embodiment. It is possible to converge to d ₀ . In addition, according to the nanofiber manufacturing method according to the modified example 2, it is possible to reduce the frequency of changing the conveyance speed V.

[Embodiment 2]
FIG. 10 is a front view of the nanofiber manufacturing apparatus 2 according to the second embodiment. FIG. 11 is a diagram for explaining the thickness measuring device 40a according to the second embodiment. FIG. 11A is a block diagram showing the relationship among the thickness measuring device 40a, the transport speed control device 50, and the transport device 10, and FIGS. 11B and 11C show the thickness measuring unit 42a and the length. FIG. 4 is a diagram illustrating a positional relationship with a scale sheet W. FIG. 12 is a diagram for explaining an image photographed by the thickness measuring unit 42a.

  The nanofiber manufacturing method 2 according to the second embodiment basically has the same configuration as the nanofiber manufacturing apparatus 1 according to the first embodiment, but the configuration of the thickness measuring apparatus is the nanofiber manufacturing apparatus according to the first embodiment. It is different from the case of 1. That is, in the nanofiber manufacturing apparatus 2 according to the second embodiment, the thickness measuring device 40a includes a thickness measuring roller 43a that guides the long sheet W along the circumferential direction, as illustrated in FIGS. The main body 41a includes a thickness measuring unit 42a including a camera that magnifies and photographs the outermost peripheral portion of the long sheet W guided by the thickness measuring roller 43a along the conveyance direction of the long sheet W. . As shown in FIG. 11, the thickness measuring device 40 a serves as a thickness measuring unit that measures the thickness d of the long sheet W at three different positions in the width direction of the long sheet W (the width direction of the long sheet W). In the middle, left end, and right end). As the thickness measuring unit 42a, a combination of a digital camera and a high-power optical microscope can be used.

The main body 41a calculates the thickness d of the long sheet W by performing image processing on the image captured by the thickness measuring unit 42a. FIG. 12 is a diagram for explaining the principle of calculating the thickness of the long sheet W by the thickness measuring unit 42a. 12A shows an image when the line S ₁ indicating the upper end of the long sheet W is displayed above the target line S ₀ , and FIG. 12B shows the upper end of the long sheet W. an image when the line S ₁ is displayed at the same height as the target line S _0, FIG. 12 (c) lower than the line S ₁ is the target line S ₀ indicating the upper end of the long sheet W This is an image when displayed on the screen. Figure 12 (a) ~ as shown in Figure 12 (c), for target line S _0, by measuring the height position of the line S ₁ showing the upper end of the long sheet W, the thickness of the long sheet W d can be calculated.

  Thus, the nanofiber manufacturing apparatus 2 according to the second embodiment is different from the nanofiber manufacturing apparatus 1 according to the first embodiment in the configuration of the thickness measuring apparatus, but the nanofibers are deposited by the electrospinning apparatus 20. A thickness measuring device 40a that measures the thickness d of the long sheet W, and a transport speed control device 50 that controls the transport speed V based on the thickness d measured by the thickness measuring device 40a. The conveyance speed can be controlled based on the thickness measured by the thickness measuring device. For this reason, similarly to the case of the nanofiber manufacturing apparatus 1 according to the first embodiment, even if the spinning conditions fluctuate and the thickness fluctuates in the electrospinning process for a long time, the conveyance speed is appropriately controlled accordingly. This makes it possible to keep the amount of variation in thickness within a predetermined range, and as a result, it is possible to mass-produce nanofiber nonwoven fabrics having a uniform thickness.

  Moreover, according to the nanofiber manufacturing apparatus 2 which concerns on Embodiment 2, the thickness measurement apparatus 40a is thickness of 3 units | sets arrange | positioned in three different positions in the width direction of the elongate sheet W as a thickness measurement part. Since the measurement unit 42a is provided, the thickness can be measured over a wide area in the width direction of the long sheet, as in the case of the nanofiber manufacturing apparatus 1 according to Embodiment 1, and the conveyance speed can be controlled more appropriately. It becomes possible to do.

  In addition, since the nanofiber manufacturing apparatus 2 which concerns on Embodiment 2 has the structure similar to the case of the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1 except the structure of thickness measurement apparatus, nanofiber manufacture which concerns on Embodiment 1 It has a corresponding effect among the effects which the apparatus 1 has.

[Embodiment 3]
FIG. 13 is a diagram illustrating the operation of the thickness measurement unit 42b according to the third embodiment. In FIG. 13, the curve shown as a sinusoidal curve is a trajectory connecting the portions where the thickness measurement unit 42 b has measured the thickness on the long sheet W.

  The nanofiber manufacturing apparatus 3 (not shown) according to the third embodiment has basically the same configuration as the nanofiber manufacturing apparatus 1 according to the first embodiment, but the configuration of the thickness measurement apparatus is the same as that of the first embodiment. This is different from the case of the nanofiber manufacturing apparatus 1. That is, in the nanofiber manufacturing apparatus 3 according to the third embodiment, the thickness measurement device 40b (not shown) measures the thickness d of the long sheet W as shown in FIG. And a drive unit 49 that reciprocates the thickness measuring unit 42b along the width direction b of the long sheet W at a predetermined period T. The thickness measuring device 40b measures the thickness d of the long sheet W while reciprocating the thickness measuring unit 42b along the width direction b of the long sheet W. The transport speed control device 50 obtains an average thickness obtained by averaging the thickness d measured by the thickness measuring unit 42b with a predetermined period T or a time corresponding to n times the period T (where n is a natural number). The conveyance speed V is controlled based on <d>.

  As described above, the nanofiber manufacturing apparatus 3 according to the third embodiment is different from the nanofiber manufacturing apparatus 1 according to the first embodiment in the configuration of the thickness measurement apparatus, but the nanofibers are deposited by the electrospinning apparatus 20. A thickness measuring device 40 that measures the thickness d of the long sheet W and a transport speed control device 50 that controls the transport speed V based on the thickness d measured by the thickness measuring device 40 are provided. The conveyance speed can be controlled based on the thickness measured by the height measuring device. For this reason, similarly to the case of the nanofiber manufacturing apparatus 1 according to the first embodiment, even if the spinning conditions fluctuate and the thickness fluctuates in the electrospinning process for a long time, the conveyance speed is appropriately controlled accordingly. This makes it possible to keep the amount of variation in thickness within a predetermined range, and as a result, it is possible to mass-produce nanofiber nonwoven fabrics having a uniform thickness.

  In addition, according to the nanofiber manufacturing apparatus 3 according to the third embodiment, the thickness measurement device 40b reciprocates the thickness measurement unit 42b along the width direction b of the long sheet W, so that the width of the long sheet is increased. The thickness can be measured over a wide range of directions, and the conveyance speed can be controlled more appropriately.

  Moreover, according to the nanofiber manufacturing apparatus 3 according to the third embodiment, the conveyance speed control device 50 corresponds to the thickness d measured by the thickness measuring unit 42 corresponding to the predetermined period T or n times the period T. Since the conveyance speed V is controlled based on the average thickness <d> obtained by averaging over time, even if the thickness is distributed in the width direction of the long sheet, the conveyance is performed based on the average thickness. By controlling the speed, it is possible to control the transport speed more appropriately.

  In addition, since the nanofiber manufacturing apparatus 3 which concerns on Embodiment 3 has the structure similar to the case of the nanofiber manufacturing apparatus 1 which concerns on Embodiment 1 except the structure of thickness measurement apparatus, the nanofiber manufacture which concerns on Embodiment 1 It has a corresponding effect among the effects which the apparatus 1 has.

  As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment, It is possible to implement in a various aspect in the range which does not deviate from the meaning. For example, the following modifications are possible.

(1) In each of the above embodiments, the nanofiber manufacturing apparatus of the present invention has been described by taking the nanofiber manufacturing apparatus including four electrospinning apparatuses as the electrospinning apparatus. However, the present invention is limited to this. is not. For example, the present invention can also be applied to a nanofiber manufacturing apparatus including 1 to 3 or 5 or more electrospinning apparatuses. Further, the present invention can be applied to a nanofiber manufacturing apparatus using a melt blow spinning apparatus or the like instead of the electrospinning apparatus. In addition, the nanofiber production apparatus of the present invention is a sheet in which a nonwoven fabric is produced on a long sheet using a melt blow spinning apparatus, a spunbond spinning apparatus, a needle punch spinning apparatus or other spinning apparatus, and nanofibers are further deposited. It can also be suitably used when the conveyance speed is controlled based on the thickness of the sheet.

(2) In each of the above embodiments, the nanofiber production apparatus of the present invention has been described using an upward electrospinning apparatus having an upward nozzle, but the present invention is not limited to this. For example, the present invention can be applied to a nanofiber manufacturing apparatus including a downward electrospinning apparatus having a downward nozzle or a lateral electrospinning apparatus having a lateral nozzle.

(3) In each of the above embodiments, the nanofiber manufacturing apparatus of the present invention is described using an electrospinning apparatus in which the positive electrode of the power supply device 160 is connected to the collector 150 and the negative electrode of the power supply device 160 is connected to the nozzle block 110. However, the present invention is not limited to this. For example, the present invention can be applied to a nanofiber manufacturing apparatus including an electrospinning apparatus in which a positive electrode of a power supply device is connected to a nozzle and a negative electrode of the power supply device is connected to a collector.

(4) In Embodiment 1 and Embodiment 2 described above, the nanofiber manufacturing apparatus of the present invention has been described by taking a nanofiber manufacturing apparatus including three thickness measuring units as an example. However, the present invention is limited to this. is not. For example, the present invention can be applied to a nanofiber manufacturing apparatus including one, two, or four or more thickness measuring units.

(5) When the nanofiber manufacturing apparatus of the present invention mass-produces nanofiber nonwoven fabric having a uniform thickness by depositing nanofibers having a uniform thickness on a long sheet having a uniform thickness, Of course, it is also suitable for mass production of nanofiber non-woven fabric having a uniform thickness as a whole by depositing nanofibers having a corresponding thickness on a long sheet having a non-uniform thickness. Can do.

(6) Although the present invention has been described using the nanofiber manufacturing apparatus in which one nozzle block is disposed in one electrospinning apparatus in the above embodiment, the present invention is not limited to this. FIG. 14 is an enlarged view of a main part of the electrospinning apparatus 20a. For example, as shown in FIG. 14, the present invention can be applied to a nanofiber manufacturing apparatus in which two nozzle blocks 110a1 and 110a2 are arranged in one electrospinning apparatus 20a, and there are two or more nozzle blocks. The present invention can also be applied to the arranged nanofiber manufacturing apparatus.

  In this case, the nozzle arrangement pitch can be made the same for all nozzle blocks, or the nozzle arrangement pitch can be made different for each nozzle block. Moreover, the height position of a nozzle block can also be made the same by all the nozzle blocks, and the height position of a nozzle block can also be varied by each nozzle block.

(7) The nanofiber manufacturing apparatus of the present invention may include a mechanism for reciprocating the nozzle block at a predetermined reciprocating cycle along the width direction of the long sheet. By performing electrospinning while reciprocating the nozzle block at a predetermined reciprocating period using this mechanism, the amount of polymer fibers deposited along the width direction of the long sheet can be made uniform. In this case, the reciprocating period and the reciprocating distance of the nozzle block may be controllable independently for each electrospinning apparatus or for each nozzle block. By setting it as such a structure, all the nozzle blocks can also be reciprocated with the same period, and each nozzle block can also be reciprocated with a different period. Further, the reciprocating distance of the reciprocating motion can be made the same for all the nozzle blocks, and the reciprocating distance of the reciprocating motion can be made different for each nozzle block.

DESCRIPTION OF SYMBOLS 1, 2 ... Nanofiber manufacturing apparatus, 10 ... Conveying device, 11 ... Feeding roller, 12 ... Winding roller, 13, 18 ... Auxiliary roller, 14, 15, 16, 17 ... Drive roller, 20, 20a ... Electrospinning device , 30 ... heating device, 32 ... heater, 40 ... thickness measuring device, 41, 41a ... main body, 42, 42a, 42b ... thickness measuring unit, 43, 44 ... laser distance measuring device, 45 ... laser diode, 46 ... Projection lens, 47 ... Light receiving lens, 48 ... Light receiving circuit, 49 ... Drive unit, 50 ... Conveyance speed control device, 60 ... Main control device, 70 ... VOC processing device, 100 ... Housing, 110, 110a1, 110a2 ... Nozzle block, 150 ... collector, 152 ... insulating member, 160 ... power supply, 170 ... auxiliary belt device, 172 ... auxiliary belt, 174 ... roller for auxiliary belt a ... conveying direction, b ... long sheet in the width direction, d ... thickness, <d> ... average thickness, V ... conveying speed, W ... long sheet, [Delta] d ... shift amount

Claims (13)

A transport device for transporting a long sheet at a predetermined transport speed;
A spinning device for depositing nanofibers on the long sheet conveyed by the conveying device;
A thickness measuring device that measures the thickness of the long sheet on which the nanofibers are deposited by the spinning device;
A nanofiber manufacturing apparatus, comprising: a transport speed control device that controls the transport speed based on the thickness measured by the thickness measuring device. In the nanofiber manufacturing apparatus according to claim 1,
The said conveyance speed control apparatus controls the said conveyance speed based on the deviation | shift amount of the thickness measured by the said thickness measurement apparatus, and predetermined | prescribed target thickness, The nanofiber manufacturing apparatus characterized by the above-mentioned. In the nanofiber manufacturing apparatus according to claim 2,
The said conveyance speed control apparatus controls the said conveyance speed in consideration of the time change rate of the said deviation | shift amount, The nanofiber manufacturing apparatus characterized by the above-mentioned. In the nanofiber manufacturing apparatus according to any one of claims 1 to 3,
The thickness measuring device is disposed so as to face each other with the long sheet interposed therebetween, and includes a thickness measuring unit including a pair of laser distance measuring devices that measure a distance to the long sheet by a triangular distance measuring method, The nanofiber manufacturing apparatus, wherein the thickness of the long sheet is calculated based on a distance measured by the pair of laser distance measuring apparatuses. In the nanofiber manufacturing apparatus according to any one of claims 1 to 3,
The thickness measuring device includes a thickness measuring roller that guides the long sheet along a circumferential direction, and an outermost peripheral portion of the long sheet guided by the thickness measuring roller. A thickness measurement unit including a camera that performs magnified photographing along a conveyance direction, and calculates the thickness of the long sheet by performing image processing on an image photographed by the camera. apparatus. In the nanofiber manufacturing apparatus according to any one of claims 1 to 5,
The thickness measuring device includes a plurality of thickness measuring units arranged at a plurality of different positions in the width direction of the long sheet as a thickness measuring unit that measures the thickness of the long sheet. Nanofiber manufacturing equipment. In the nanofiber manufacturing apparatus according to claim 6,
The said conveyance speed control apparatus controls the said conveyance speed based on the average thickness obtained by averaging the thickness measured by these thickness measurement parts, The nanofiber manufacturing apparatus characterized by the above-mentioned. In the nanofiber manufacturing apparatus according to any one of claims 1 to 5,
The thickness measuring device includes: a thickness measuring unit that measures the thickness of the long sheet; and a drive unit that reciprocates the thickness measuring unit in a predetermined cycle along the width direction of the long sheet. An apparatus for producing nanofiber, comprising: In the nanofiber manufacturing apparatus according to claim 8,
The transport speed control device is an average thickness obtained by averaging the thickness measured by the thickness measuring unit over the predetermined period or a time corresponding to n times the period (where n is a natural number). The said nanofiber manufacturing apparatus characterized by controlling the said conveyance speed based on. In the nanofiber manufacturing apparatus according to any one of claims 1 to 9,
An apparatus for producing nanofibers, further comprising a heating device that is disposed between the spinning device and the thickness measuring device and that heats the long sheet on which the nanofibers are deposited. In the nanofiber manufacturing apparatus according to any one of claims 1 to 10,
A nanofiber production apparatus comprising a plurality of spinning apparatuses arranged in series along a predetermined conveyance direction in which the long sheet is conveyed as the spinning apparatus. In the nanofiber manufacturing apparatus according to any one of claims 1 to 11,
The spinning apparatus is an electrospinning apparatus.   While depositing nanofibers on a long sheet that is being transported at a predetermined transport speed, the thickness of the long sheet on which the nanofibers are deposited is measured, and based on the measured thickness of the long sheet And controlling the conveying speed of the long sheet.

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