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Nanofiber manufacturing device

a manufacturing device and nanofiber technology, applied in the field of nanofiber manufacturing equipment, can solve the problems of difficult continuous operation of the electrospinning device, increased leak current to an undesirable level, and caused by the breakdown of the insulation between the collector and the case and other members, and achieve the effect of stably producing nanofibers, simple structure and shap

Inactive Publication Date: 2013-10-17
TOPTEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a nanofiber manufacturing apparatus that prevents the need for high potential voltage specifications to the material tank and polymer solution transferring instruments, which can simplify the electrospinning process. The apparatus includes a case or nozzle block that is grounded, which removes the need for high potential voltage specifications to the material tank and polymer solution transferring instruments. The apparatus also includes an auxiliary belt that prevents interference in the conveying of a long sheet and allows for uniform electrospinning. The invention aims to improve the stability and efficiency of the nanofiber production process.

Problems solved by technology

According to the electrospinning device 900 disclosed in the cited document, however, the insulation between the collector and the case and other members is not sufficiently formed, and so as to manufacture the nanofibers having desired performance, thus, if the electrospinning is conducted through the application of an extremely high voltage (for example, 35 kV) between the nozzle block and the collector, the insulation breakdown between the collector and the case and other members is caused.
Even if the insulation breakdown does not occur, leak current may be increased to an undesirable level.
As a result, the operation of the electrospinning device should stop, which makes it hard to continuously operate the electrospinning device for long hours, and furthermore, it is difficult to stably produce the nanofibers having the desired performance in large quantities.
According to the electrospinning device 900 disclosed in the cited document, additionally, since the high voltage is applied to the collector, large electrostatic attraction between the collector and the collection base material occurs to cause the base material to be pulled toward the collector, which fails to the gentle conveying of the base material.
Accordingly, it is hard to conduct the electrospinning of the nanofibers under the uniform conditions for long hours, and of course, the operation itself of the electrospinning device should stop.
Further, it is impossible to produce the nanofibers having uniform qualities (for example, in the mean diameters of nanofibers, in the distribution of the diameters of nanofibers, in the accumulation quantities of nanofibers, in the thicknesses of nanofiber layers, and in the air permeability of nanofiber layers and so on) in large quantities.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0098]FIGS. 1a and 1b are front and plan views showing a nanofiber manufacturing apparatus according to a first embodiment of the present invention. FIG. 1a is a front view showing the nanofiber manufacturing apparatus 1 and FIG. 1b is a plan view showing the nanofiber manufacturing apparatus 1. In FIGS. 1a and 1b, a polymer solution supply unit and a polymer solution collection unit are not shown. Further, some parts of FIG. 1a are shown in FIG. 2.

[0099]FIG. 2 is a sectional view showing an electrospinning unit used in the nanofiber manufacturing apparatus according to the first embodiment of the present invention.

[0100]FIGS. 3a and 3b are enlarged sectional and plan views showing the main parts of the electrospinning unit, wherein FIG. 3a is an enlarged sectional view showing the main parts of the electrospinning unit and FIG. 3b is an enlarged plan view showing the main parts of the electrospinning unit. FIG. 4 is a sectional view showing an auxiliary belt unit moved in a conveyi...

example 1

[0134]Example 1 is the experimental example clearly showing the appropriate thickness a of the insulation member 152, so as to stop the leak current at the given range. Table 1 shows the experimental results of the example 1, and FIG. 8 is a graph showing the experimental results of the example 1.

TABLE 1a =a =a = 5 mma = 6 mma = 8 mm10 mm12 mmmAkVmAkVmAkVmAkVmAkV0.0129.80.0137.20.0141.00.0143.00.0146.30.0234.40.0244.30.0246.60.0249.00.0254.00.030.0349.10.0354.80.0356.00.0359.00.040.0450.30.0459.70.040.04Insu-36.053.4lationBreak-down*b is fixed to 30 mm

[0135]In the example 1, in the state where the polymer solution was not fed to the nozzle block 110 in the nanofiber manufacturing apparatus 1 according to the present invention (wherein, the thickness a was set to 5 mm, 6 mm, 8 mm, 10 mm or 12 mm, and the distance b was fixed to 30 mm), the voltage was applied between the collector 150 and the nozzle block 110 to allow a given current supplied from the power supply 160 to become a giv...

example 2

[0137]Example 2 is the experimental example clearly showing the appropriate distance a+b between the insulation member 152 and the collector 150, so as to stop the leak current at the given range. Table 2 shows the experimental results of the example 2, and FIG. 9 is a graph showing the experimental results of the example 2.

TABLE 2mAkVmAkVmAkVmAkVa + b =a + b =a + b =a + b =45 mm50 mm60 mm80 mm0.0132.20.0137.00.0139.20.0140.30.0234.80.0237.30.0250.20.0250.70.0336.30.0340.80.030.0353.00.0437.00.0442.60.040.0456.50.05—0.05—0.050.05Insulation—46.054.058.8Break-downa + b =a + b =a + b =a + b =100 mm120 mm140 mm160 mm0.0141.20.0141.70.0141.80.0142.80.0250.90.0252.70.0255.30.0257.10.0354.80.0360.30.0360.50.0360.80.0457.30.04—0.04—0.04—0.0560.70.05—0.05—0.05—Insulation————Break-down*a is fixed to 40 mm

[0138]In the example 2, in the state where the polymer solution was not fed to the nozzle block 110 in the nanofiber manufacturing apparatus 1 according to the present invention (wherein, the...

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Abstract

The present invention relates to a nanofiber manufacturing apparatus having a plurality of electrospinning units disposed serially along the conveying direction of a long sheet, each electrospinning unit including: a conductive case; a collector attached to the case by means of an insulation member; a nozzle block disposed to face the collector and having a plurality of nozzles from which polymer solution is ejected mounted thereon; a power supply adapted to apply a high voltage to a space between the collector and the nozzle block; an auxiliary belt formed of an insulative porous endless belt located and freely rotated at a position encompassing the collector; and an auxiliary belt driver adapted to rotate the auxiliary belt to a rotating speed corresponding to the conveying speed of the long sheet, wherein the positive electrode of the power supply is connected to the collector, and the negative electrode thereof to the nozzle block and the case, and when the collector is seen from the nozzle block, the outer edge of the insulation member is located more outwardly than the outer edge of the collector, so that if it is assumed that the thickness of the insulation member is a and the distance between the outer edge of the insulation member and the outer edge of the collector is b, it is satisfied that a≧6 mm and a+b≧50 mm.

Description

CROSS REFERENCE RELATED APPLICATION[0001]This application claims foreign priority of Japanese Patent Application No. 2010-272078, filed on Dec. 6, 2010 and Korean Patent Application No. 10-2011-0017376, filed on Feb. 25, 2011, which are incorporated by reference in their entirety into this application.TECHNICAL FIELD[0002]The present invention relates to a nanofiber manufacturing apparatus.BACKGROUND ART[0003]In conventional practices, there is proposed a nanofiber manufacturing apparatus having a plurality of electrospinning units located along a given conveying direction in which a long sheet is conveyed. Further, as the electrospinning devices used in such nanofiber manufacturing apparatus, there has been proposed Japanese Patent No. 2008-506864 (hereinafter, referred to as cited document) wherein each electrospinning device applies a high voltage to a collector in the state where a nozzle block is grounded, thereby conducting electrospinning.[0004]FIG. 30 shows an electrospinnin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01D5/00
CPCD01D5/0076B82Y30/00B82Y40/00D01D1/06D01D5/0061D01D5/0069D01D13/00D01D13/02D01F13/00Y02P70/62D01D4/00D01D5/00
Inventor LEE, JAE HWAN
Owner TOPTEC
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