TW202132642A - Apparatus and method for producing nanofiber - Google Patents

Abstract

An object of the present invention is to provide an apparatus and method for producing a nanofiber by using a melt blown method improving productivity. A pellet-shaped raw material (resin) fed into a hopper 2 is supplied and melted in a heating cylinder 3 heated by a heater 4, and sent to a front part of the heating cylinder 3 by a screw 5 rotated by a motor 6. The heating cylinder 3 is provided with a head portion 7, and a high-pressure gas is ejected from the gas ejection hole 71 provided at a center of the head portion 7. The melted resin sent to an end of the heating cylinder 3 is discharged from a resin discharging hole 73 having six superfine tubes provided in a downstream side of the resin ejection hole 73 through inside of the head portion 7. The melted resin discharged from the resin discharge hole 73 is elongated and a fiber having nanometer-order diameter can be formed.

Description

Nanofiber manufacturing device and nanofiber manufacturing method

The present invention relates to a nanofiber manufacturing device and a nanofiber manufacturing method that can provide high-quality nanofibers with a simple structure.

In recent years, the demand for fibers with nanometer diameters, so-called nanofibers, has increased rapidly. As the use of nanofibers expands, special nanofibers of higher quality and corresponding to the application are required. In addition, various known methods such as electrospinning and meltblowing are known for the production of nanofibers, and each method has advantages and disadvantages.

As the above-mentioned background art, Patent Document 1 discloses a method for producing a nonwoven fabric composed of a plurality of types of fibers in which a solution is mixed with melt-blown fibers and the fibers are discharged. Specifically, the solution ejection fiber is mixed into the fiber stream of the melt blown fiber ejected from the nozzle by the melt blow method, wherein the solution ejection fiber uses the spinning solution ejected from the liquid ejection section by the gas ejection The solution spinning means that sprays out the gas to spray out the spinning solution and fiberize it.

In addition, Non-Patent Document 1 discloses a method for producing nanofibers based on the electrospinning method. In this non-patent document 1, it is disclosed that compared with the conventional electrospinning method of resin-based swelling that requires a solvent, the production of nanofibers is performed by swelling based on heat without using a solvent to prevent ignition when a solvent is used. The composition of the explosion, etc. In addition, the defects of the nanofiber manufacturing method based on the melt blown method are also described in detail.

Patent Document 1: Japanese Patent Publication No. 2010-185153

Non-Patent Document 1: WEB-Journal No.151 Non-woven Fabric Supplement (Http://www.webj.co.jp/index.html)

As also described in Non-Patent Document 1, in the conventional melt-blown nanofiber manufacturing method, in order to reduce the fiber diameter, a method of blowing high-temperature air at a high speed and discharging the polymer can be considered. The method of suppression is low. However, when high-temperature air is ejected at a high speed, the fiber diameter becomes thin but the fiber length becomes fragmented. On the other hand, when the discharge of the polymer is suppressed to a low level, it results in a per unit time. The production volume is significantly reduced, and it is difficult to mass-produce high-quality nanofibers under any circumstances. In contrast to this, although the productivity of the electrospinning method is improved, the device has become complex, and countermeasures against ignition and explosion are required, which leads to an increase in manufacturing costs.

The present invention was made in view of the above-mentioned problems, and its purpose is to provide a method that can supply a large amount of high-quality nanofibers in a melt-blown nanofiber manufacturing method, and further eliminates the main cause of ignition or explosion to improve safety. The nanofiber manufacturing method and nanofiber manufacturing device. [Technical means to solve the problem]

The nanofiber manufacturing apparatus of the present invention is a nanofiber manufacturing apparatus equipped with liquid raw material ejection means for ejecting liquid raw material from a high-pressure gas flow ejected from a high-pressure gas ejection means, wherein the liquid raw material ejection means is A plurality of high-pressure gas streams ejected from the aforementioned high-pressure gas ejection means are arranged at the center.

In addition, in the nanofiber manufacturing apparatus of the present invention, the liquid raw material ejection means includes an extrusion means for melting and extruding the raw material.

In addition, in the nanofiber manufacturing apparatus of the present invention, the liquid raw material ejection means includes a means for supplying a molten raw material.

In addition, in the nanofiber manufacturing apparatus of the present invention, the high-pressure gas ejection means is provided with gas supply means for supplying high-pressure and high-temperature gas, and the high-temperature gas is ejected at high pressure from the high-pressure gas ejection means.

In addition, the nanofiber manufacturing apparatus of the present invention includes angle adjustment means capable of adjusting the installation angle of the liquid raw material ejection means with respect to the high-pressure gas flow ejected from the high-pressure gas ejection means.

In addition, in the nanofiber manufacturing apparatus of the present invention, at least two or more of the liquid raw material ejection means are arranged symmetrically with respect to the high-pressure gas ejection means.

In addition, in the nanofiber manufacturing apparatus of the present invention, the liquid raw material ejection means is arranged at equal intervals around the high-pressure gas flow ejected from the high-pressure gas ejection means.

In addition, in the nanofiber manufacturing apparatus of the present invention, the high-pressure gas flow ejected from the high-pressure gas ejection means is installed in a direction perpendicular to the installation surface of the nanofiber manufacturing apparatus.

The method for producing nanofibers of the present invention is a method for producing nanofibers by ejecting a liquid raw material from a liquid raw material ejecting means to produce nanofibers with respect to a high-pressure gas flow ejected from a high-pressure gas ejecting means. In the method, when the liquid raw material is discharged from a plurality of the liquid raw material discharge means arranged around the high pressure gas flow discharged from the high pressure gas discharge means, the liquid raw material discharge means is adjusted relative to the high pressure The discharge angle of the liquid material in the air stream.

Furthermore, the nanofiber manufacturing method of the present invention is a nanofiber manufacturing method using a nanofiber manufacturing device. The nanofiber manufacturing device is provided with a heating cylinder to which raw materials are supplied, heating means for heating the heating cylinder, and In the extrusion device for extruding the raw material in the heating cylinder, in the method, a gas ejection port for injecting high-pressure gas is provided at the end of the heating cylinder, and the gas ejection port is provided around the gas ejection port to be melted in the heating cylinder A plurality of raw material discharging means of the raw material in the state, the heating cylinder is heated by the heating means to melt the raw material supplied to the inside of the heating cylinder or maintain the molten state of the raw material, and the raw material is removed from the heating cylinder by the extrusion device The raw material ejection means ejects, generates a gas flow by the gas ejected from the gas ejection port, and stretches the ejected raw material into a nanometer diameter fiber by mounting the ejected raw material on the flow of the ejected gas from the outer periphery.

According to the present invention, nanofibers with smaller diameter and higher quality can be safely manufactured. In addition, when manufacturing nanofibers, it is possible to compensate for the production volume per unit time which is a defect based on the melt-blown method by installing a plurality of resin ejection means without using a high-voltage device.

The mode for carrying out the present invention will be described below. Of course, it goes without saying that the present invention can be easily applied to a structure other than the structure described in this embodiment within the scope of not violating the spirit of the invention.

In the present invention, a liquid raw material is supplied to form nanofibers with respect to a fluid (a gaseous fluid is preferred) ejected at a high pressure. However, in the specification of the present application, when the composition is referred to as "gas" without specifying the composition, It includes gases composed of all components or molecular structures. In addition, in the specification of this application, "raw material" refers to all materials used when forming nanofibers. In the following examples, examples of using synthetic resin as "raw material" are described, but it is not limited to this. , Various constituent materials can be used. In addition, in the specification of this application, the term "liquid raw material" is not limited to those in which the properties of the raw materials are liquid, and is included in Example 1 where a solid raw material is melted and extruded by an extrusion device to form nanofibers. The "melted raw material" used in the chemistry is included in pre-melting a predetermined solvent to make a solid raw material or a liquid raw material to a predetermined concentration, and send it to the outlet or squeeze it by an appropriate means. Come out to form the "melted raw material" used in Example 2 of nanofibers. That is, the "liquid raw material" in the present invention refers to those that need to have a viscosity to the extent that the "raw material" can be supplied (discharged, discharged) from the supply port (discharge port, discharge port). In the present invention, , The "raw material" with such liquid properties is called "liquid raw material".

The details will be described later, but the concept of the basic invention common to the nanofiber manufacturing apparatus and the nanofiber manufacturing method explained as the first and second embodiments of the present invention is shown in Figure 11, with the center In the high-pressure gas ejection means 71, around the high-pressure gas flow 90 ejected from the high-pressure gas ejection means 71, the installation angles of the plurality of ejection means 73a for ejecting liquid raw materials can be changed. That is, it is one that can change the supply angle θ of the liquid raw material relative to the high-pressure gas flow 90. The basic concept of the present invention is shown in Fig. 11. The discharge means 73a for discharging the liquid raw material is arranged at a supply angle θ with respect to the center line 91 of the high-pressure airflow 90, and the supplied discharged liquid raw material is discharged from the plurality of discharge means 73a. It is arranged toward the center line 91 of the high-pressure airflow 90. The liquid raw material discharged from the plurality of discharge means 73a is preferably arranged so as to cross on the center line 91.

In Figure 11, the arrangement state of each constituent element is as above, and the positional relationship is as follows. If these are expressed based on the position of the gas ejection port 71 (open nozzle) of the high-pressure gas, and the positional relationship is retreated further downstream than it, then a is the raw material ejection port from the ejection port of the ejection means 73a The retreat distance, b is the retreat distance from the discharge port of the discharge means 73a where the discharge material crosses, c is the opening diameter of the discharge port of the discharge means 73a, and d is the gas discharge port gap. Here, the configuration is as follows: with respect to the center line 91 of the high-pressure airflow 90, the discharge means 73a for discharging the liquid raw material is arranged at a supply angle θ, and the raw material supply tangent angle represented by tanθ=d/(ba)(1) θ can be adjusted within the range of 0°<θ<90°. As an example, when the material ejection port retreat distance a=30mm, the ejection port opening diameter c=2mm, the gas ejection port gap d=7mm, and the ejection pressure of the high-pressure gas is about 0.15MPa, it is desirable that θ=20°±10°.

In this way, the raw material supply tangent angle θ should be determined by the retreat distance a of the raw material discharge port, the retreat distance b of the discharge material crossing position, and the gas discharge port gap d. Moreover, it should be determined by the high pressure gas discharge port opening diameter c and the discharge high pressure Determined by the relationship between gas pressure and temperature.

In the nanofiber manufacturing apparatus and the nanofiber manufacturing method of Example 1 of the present invention, the pelletized raw material (resin) put in the hopper is fed into a heating cylinder heated by a heater to be melted, It is sent out to the front of the heating cylinder by a screw that rotates by a motor. The heating cylinder is provided with a head, and high-pressure gas is ejected from a gas ejection port formed in the center of the head. The liquid molten raw material (melted resin) that reaches the tip of the heating cylinder passes through the inside of the head and is supplied from a plurality of ultra-thin tubes arranged on the downstream side of the gas ejection means ( The means of spitting out) is supplied (spitting out). The liquid molten raw material ejection means of a plurality of ultra-thin tubes are uniformly arranged around the gas ejection port arranged in the center. Thereby, the molten resin discharged from the liquid molten raw material discharging means is stretched to form fibers with nanometer diameter.

In the nanofiber manufacturing apparatus and the nanofiber manufacturing method of the second embodiment of the present invention, the high-pressure gas is ejected from the gas ejection port formed in the center. In contrast, the liquid melted raw material is ejected from the The means for discharging the liquid molten raw material with a plurality of ultra-thin tubes on the downstream side of the means discharges high-pressure gas.

(Example 1) Hereinafter, the overall configuration of the nanofiber manufacturing apparatus in Example 1 of the present invention will be described based on Figs. 1 to 3.

As the first embodiment of the present invention, the nanofiber manufacturing apparatus 1 shown in Fig. 1 is composed of the following: a hopper 2 for charging the resin (fine particle size granular synthetic resin) as the material of the nanofiber Into the nanofiber manufacturing device 1; the heating cylinder 3 is used to receive the supply of resin from the hopper 2 and heat and melt it; the heater 4 is used as a heating means for heating the heating cylinder from the outside; the screw 5 is rotatable It is housed in the heating cylinder 3 and is used as an extrusion device for moving the molten resin to the tip of the heating cylinder 3 by rotation; the motor 6 is used to rotate the screw 5 through the connection part 61 (details not shown) The driving means; and the cylindrical head 7 is provided at the front end of the heating cylinder 3, and is equipped with a resin ejection means for ejecting the molten resin described later from the surroundings, and also has a gaseous hot air jet from the center The gas ejection port 71 (open nozzle). In order to inject the jet gas from the center portion of the cylindrical head 7, a high-pressure gas is supplied through a pipe 81 connected to a gas piping portion 8 as a gas supply pipe. The gas piping portion 8 is provided with heating means (not shown) such as a heater, and is configured to blow hot air from the gas ejection port 71 (open nozzle). In addition, the head 7 and the heating cylinder 3 are connected via a sheet portion 9 such as an O-ring or a ring-shaped sheet member, and have a structure in which molten resin does not leak out of the device.

The plurality of heaters 4 arranged on the outer periphery of the heating cylinder 3 are configured by a control means not shown so as to be able to individually or collectively perform temperature control. In this embodiment, as shown in Fig. 1, four heaters 4 are provided, but it is not limited to this. The diameter or length of the heating cylinder 3 can be determined according to the material or nature of the resin used. Wait for many conditions to change the number of settings, or change the size of each heater, or change the configuration conditions appropriately.

Fig. 2 is a plan view of the nanofiber manufacturing apparatus 1 of the present embodiment, and Fig. 3 is a front view. 4 to 6 are explanatory diagrams showing the structure of the head 7.

As shown in FIG. 3, in the head 7 as an embodiment of the present invention, a pipe 81 for supplying high-pressure gas is connected from the outer periphery of the heating cylinder 3 via a gas piping portion 8. The high-pressure gas from the pipe 81 is introduced into the inside of the head 7 and is ejected from the gas ejection port 71 (open nozzle: Fig. 3) formed in the center. Around the gas ejection port 71, a plurality of resin ejection means 73 are arranged at equal intervals. In the present embodiment, the resin ejection means 73 is constituted by a resin ejection needle attachment portion 73b provided with a resin ejection needle 73a and a structure for attaching the resin ejection needle 73a to the head 7.

The head 7 shown in FIG. 3 includes a heating cylinder cover 77 covering the front end of the heating cylinder 3, and a resin ejection means holding ring 78 as a means for holding the resin ejection means 73. The resin ejection means holding ring portion 78 is fixed to the heating cylinder cover portion 77 by fixing means (unsigned) such as bolts.

When multiple resin ejection means 73 are arranged around the gas ejection port 71 (open nozzle) by the retaining ring 78 of the resin ejection means, the plurality of resin ejection means 73 are arranged at equal intervals and equal distances (from the gas ejection port). The distance a), or equal angle (discharge angle θ) is set, which can greatly increase the production of nanofibers with uniform diameter and fiber length.

Here, the arrangement relationship between the gas ejection port 71 (open nozzle) and the resin ejection means 73 arranged around will be described with reference to FIG. 11. It is ejected by the air flow 90 ejected from the gas ejection port 71 arranged at the center of the head 7. The air flow 90 is provided with a plurality of resin ejection means 73 arranged around it, and is ejected from the resin ejection needle 73a as the resin ejection port toward the air flow 90 ejected from the ejection port 71 at the ejection angle θ. The resin ejection port of the resin ejection needle 73a is arranged in front of the distance a from the ejection port 71 (the downstream side when following the airflow 90 from the ejection port 71). The resin ejection ports of the plurality of resin ejection needles 73a are ejected so that the ejected resin crosses the distance b from the ejection port 71 (the downstream side when following the airflow 90 from the ejection port 71).

By changing the number, arrangement interval, arrangement distance (distance a from the gas ejection port), arrangement angle (θ) of the resin ejection means 73 as the arrangement conditions of the plural resin ejection means 73, it is also possible to form a non-uniform diameter Or nanofiber of fiber length. Therefore, the placement conditions such as the placement interval of the resin ejection means 73 may be appropriately selected and changed according to the use of the nanofibers to be produced.

Figure 4 is a cross-sectional view taken along the line AA of the head 7 in Figure 3, and Figure 5 (a), Figure 5 (b), and Figure 5 (c) show the main parts of the head 7 in Figure 4 (BB section, CC section, DD section) each section view. In addition, FIG. 6 is an explanatory diagram showing the flow path A of the high-pressure gas and the flow path B of the molten resin. As shown in FIGS. 4 to 6, six resin flow paths 75 (arrow B in the figure) corresponding to the resin ejection means 73 are formed at equal intervals in the interior of the head 7. The resin discharge means 73 is connected to the heating cylinder 3 via the resin flow path 75. The molten resin extruded by the rotation of the screw 5 flows into the resin flow path 75 shown in the DD cross-sectional view of Fig. 5(c), and flows into the resin flow path 75 shown in the CC cross-sectional view, as shown in the BB cross-sectional view The resin is ejected from the inside of the resin ejection needle attachment portion 73b and ejected from the resin ejection needle 73a. At this time, as shown in Fig. 4, the gas flow path 72 (arrow A in the figure) is formed in the center of the head 7 so as not to interfere with the resin flow path 75 (arrow B in the figure), as shown in Fig. 5 As shown in the CC cross-sectional view of (b), it passes between any adjacent resin flow paths 75, and is formed by changing the direction from the outside of the head 7 to the inside. The gas piping portion 8 is connected to the gas flow path 72 via the pipe 81. Through the gas flow path 72 formed in this way, the high-pressure and high-temperature gas supplied by the gas injection portion 8 is injected from the gas injection port 71 (open nozzle). In this way, the resin flow path 75 and the gas flow path 72 are formed without interfering with each other in the head 7. In addition, the reference numeral 79 in FIG. 7( b) is the threaded portion 79 when the pipe (gas flow path) 81 is attached to the heating cylinder cover portion 77.

In order to adjust the arrangement condition of the gas flow path 72 with respect to the resin discharge means 73, a holding adjustment means 74 of the resin discharge means 73 is provided. However, the diameter of the resin ejection port of the resin ejection needle 73a of the resin ejection means 73 is very small, and it is very susceptible to stresses such as device vibration and resin pressure. The arrangement conditions of the resin ejection means 73 described above may also be changed. Or detachment from the head 7 occurs. Therefore, even if the angle of the resin ejection port 74 is adjusted and changed, it is necessary to set the resin ejection needle 73a so that the resin ejection needle 73a does not detach from the head 7 so as not to apply stress to the resin ejection needle 73a.

Figure 7 (a) is an explanatory view showing the support structure based on the resin ejection port support portion 74. The resin ejection port support portion 74 is used to fix and adjust the resin ejection means 73 with respect to the resin ejection means holding ring 78 installation angle. The resin ejection means 73 is composed of a resin ejection needle 73a and a resin ejection needle attachment portion 73b. The resin ejection needle attachment portion 73b is fixed to the head 7 by appropriate fixing means based on screws, engagements, pins, etc., not shown. The resin ejection means holds the ring portion 78. A resin ejection port support portion 74 is provided on the resin ejection needle 73a. The resin ejection port support portion 74 is provided with a resin ejection needle grip portion 74a such that the resin ejection needle 73a is gripped from the surroundings, and as shown in FIG. The adjustment means 74b constitutes. By operating the adjustment means 74b to advance and retreat the adjustment rod 74c and move the resin ejection needle grip 74a in the diameter direction of the head 7, the resin ejection needle 73a can be fixed at a desired position and angle. With this kind of resin ejection port support portion 74, the resin ejection means 73 can be adjusted to eject the molten resin at a desired ejection angle with respect to the ejection airflow from the gas ejection port 71, and can be reliably adjusted at this angle. fixed.

According to this structure, it is useful as a means for adjusting the ejection angle of the molten resin with respect to the ejected airflow, and the resin ejection needle 73a is a very thin tube, and its tip may be caused by the motor 6 or the motor 6 when the nanofiber manufacturing apparatus 1 is operating. The driving of the screw 5 causes a large amount of vibration, but the resin ejection port support portion 74 can also effectively suppress the vibration. In addition, in Figure 2 of this embodiment, the resin ejection means 73 is set to six, and the resin ejection port support portion 74 is provided with six correspondingly. However, it is not limited to this, and it can be determined according to the resin used. , Production volume, product characteristics and other conditions to select the quantity appropriately.

Another example of the angle adjustment function of the resin discharge means 73 is shown in FIG. 7(b). In this embodiment, the resin ejection port support portion 74 is also provided with a resin ejection needle grip portion 74d so as to hold the resin ejection needle 73a from the surroundings, and an adjustment rod 74e that can advance and retreat provided from the outside of the head 7 toward the inside. The adjustment means (not shown) constitute. At this time, the adjustment means is operated to advance and retreat the adjustment rod 74e to move the resin ejection needle grip 74d in the diameter direction of the head 7, thereby fixing the resin ejection needle 73a at a desired position and angle. At this time, the resin ejection needle attachment portion 73c is made into a spherical or cylindrical shape, and the resin ejection needle attachment portion 73c is formed as a rotatable and rotatable sliding surface 76 on the resin ejection means retaining ring portion 78 of the head 7. By attaching the resin ejection needle attachment portion 73c, the angle of the resin ejection needle 73a can be easily adjusted. Thereby, it is possible to adjust the angle of the resin ejection means 73 without worrying about falling off of the resin ejection needle 73a.

In addition, as shown in the figure, the gas ejection port 71 and the resin ejection means 73 are configured such that the gas ejection port 71 is retracted to a position on the downstream side of the resin ejection means 73 and arranged. With this configuration, the molten resin is gradually stretched along the distribution of the jet flow of the gas jetted from the gas jet port 71 and becomes a fiber shape with a nanometer diameter. In addition, the gas as hot air is injected from the gas injection section 8 by a heating means not shown, so that the resin discharged from the resin discharge means 73 can be made longer and with a smaller fiber diameter than when the room temperature gas is injected. Nano fiber.

A series of operations of the nanofiber manufacturing apparatus 1 configured as described above will be described. The raw material (resin) put into the hopper 2 is heated by the heater 4 in the heating cylinder 3 to be melted, and is sent out to the front of the heating cylinder 3 by a screw rotated by the motor 6. The molten resin reaching the tip of the heating cylinder 3 is ejected from the raw material ejection ports of the six resin ejection needles through the six resin flow paths 75 formed in the inside of the head 7. The ejected molten resin is transported by the air flow generated by the high-pressure and high-temperature gas supplied from the gas ejection portion 8 and ejected from the gas ejection port 71. At this time, the molten resin is stretched to form nanofibers due to the speed difference between the faster high-temperature gas flow and the slower air remaining around it.

(Example 2) As Example 1 of the present invention, the nanofiber manufacturing device that melts the granular synthetic resin of fine particle size and is used as a raw material is described in detail. It is not limited to this, and it is also possible to use a solid raw material or a liquid raw material melt|dissolved in advance with respect to a predetermined solvent, so that it may become a molten raw material of a predetermined concentration. It is also a liquid raw material. Figures 8 to 10 show a nanofiber manufacturing device for forming nanofibers from molten raw materials. In addition, the same reference numerals are assigned to the same configurations as those of the first embodiment, and detailed descriptions thereof are omitted.

In Example 2 of the present invention, a solvent reservoir 5A having a function of applying a predetermined pressure to the molten raw material to perform extrusion is used instead of the hopper 2, screw 5, and motor 6 of Example 1. The prescribed pressure may be the pressure based on the gravity generated by the height difference. The head 7A is connected to the solvent supply pipe 3A and the gas injection unit 8. Although illustration is omitted, a means for ejecting gas may be appropriately provided in the gas injection section 8 or introduced into the gas injection section 8 from a high-pressure gas supply section (not shown). As shown in FIG. 9, the head 7A is provided with a gas flow path 72A serving as a flow path of the gas supplied from the gas injection unit 8 and a gas injection port 71A. In addition, the head 7A is also provided with a resin flow path 75A as a flow path of the melting material, and the resin flow path 75A is connected to the resin discharge means 73. The resin ejection means 73 is composed of a resin ejection needle 73a as the ejection port of the molten raw material, and a resin ejection needle attachment portion not shown in Figs. 8 to 10, as in Example 1. In addition, the head 7A is provided with a resin ejection means holding plate portion 78A, and here is provided an adjustment means provided with a resin ejection needle holding portion 74a and an adjustment rod 74c that can advance and retreat installed from the outside to the inside of the head 7A. The resin ejection port support portion 74 constituted by 74b can thereby freely adjust the ejection angle of the resin ejection needle 73a by the resin ejection port support portion 74 as in the first embodiment.

As shown in Fig. 10, the nanofiber manufacturing apparatus in Example 2 is provided with two resin ejection means 73. Of course, the arrangement of the resin discharge means 73 is not limited to two, and three or more resin discharge means 73 may be provided around the gas injection port 71A. At this time, it is desirable to provide the resin discharge means 73 uniformly. In addition, the embodiment shown in the figure shows a horizontal ejection type, but as long as those skilled in the art can easily imagine that the gas flow path 72A from the gas ejection port 71A is vertical (from the top to the bottom, or from the top to the bottom). A modified example of spraying from the bottom to the top).

With such a configuration, compared with the configuration of Example 1, the molten raw material in which the raw material is melted in the solvent is used, thereby making it possible to construct a nanofiber manufacturing device without using heating cylinders, motors, screws, etc. The size becomes compact and space saving can be achieved. In addition, the device can be constructed compactly, thereby making it possible to construct a lightweight nanofiber manufacturing device. In the case of this kind of portable nanofiber manufacturing device, nanofibers can be formed by spraying nanofibers toward the position where the nanofibers are to be attached, and the applications of nanofibers are expanded.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the foregoing embodiments, and various modifications can be implemented within the scope of the gist of the present invention. For example, in the above-mentioned embodiment, it is shown as a horizontal type nanofiber manufacturing device with the molten resin and gas ejection port facing the horizontal direction, but it is not limited to this, and it is used as a horizontal type nanofiber manufacturing device facing downward. There is no problem with the fiber manufacturing device and manufacturing method. This situation can effectively avoid the influence of gravity. In addition, the extrusion device is described as the screw 5, but the manufactured nanofibers are required to be cut off, but there is no problem even if the solution is sequentially supplied like die casting and the extrusion is interrupted by a piston or the like. Furthermore, the gas ejection port 71 can be formed into a tapered shape and a nozzle shape, and the pressure can be increased. Furthermore, the structure for adjusting the angle of the resin ejection needle 73a will be described with two specific examples, but for example, any structure may be adopted as long as the structure can adjust the angle of the bellows type resin ejection means.

1: Nano fiber manufacturing equipment 2: Hopper 3: heating cylinder 4: Heater (heating means) 5: Screw (extrusion device) 6: Motor (driving means) 7: head 71: Gas outlet 72: Gas flow path 73: Resin spit out means 73a: Resin ejection needle (raw material ejection port) 73b, 73c: Resin ejection needle mounting part 74: Resin discharge port support part 74a: Resin ejection needle grip 74b: Adjustment Department 74c: adjustment lever 75: Resin flow path 76: Gas flow path 77: Heating cylinder cover 78: Resin discharge means holding ring 8: Gas injection part (gas injection means) 81: Pipe (gas flow path) 90: high-pressure airflow 91: Centerline of high-pressure airflow

Fig. 1 is a cross-sectional side view showing a part of the overall configuration of Embodiment 1 of the nanofiber manufacturing apparatus of the present invention. Figure 2 is a plan view of the external appearance of the head and heating cylinder in the nanofiber manufacturing apparatus as the first embodiment of the present invention. Fig. 3 is a front view showing the external appearance of the tip of the head in the nanofiber manufacturing apparatus as an embodiment of the present invention. Figure 4 is a cross-sectional view taken along the line A-A of the nanofiber manufacturing device shown in Figure 3. Figure 5 is a cross-sectional view of the B-B, C-C, and D-D lines of the nanofiber manufacturing device shown in Figure 4. Fig. 6 is an explanatory diagram showing the resin flow path and the gas flow path inside the head of the nanofiber manufacturing apparatus as the first embodiment of the present invention. Figure 7 shows an example of the support structure of Figure 7 (a) of the resin ejection means and another example of Figure 7 (b) of the support structure of the resin ejection means in the nanofiber manufacturing apparatus of Example 1 of the present invention The explanatory diagram. Fig. 8 is a side view showing the overall configuration of Embodiment 2 of the nanofiber manufacturing apparatus of the present invention. Fig. 9 is a plan view showing the overall configuration of Example 2 of the nanofiber manufacturing apparatus of the present invention. Fig. 10 is a front view showing the structure of the head of Example 2 of the nanofiber manufacturing apparatus of the present invention. Figure 11 is an explanatory diagram for explaining the basic inventive concept of the nanofiber manufacturing apparatus and nanofiber manufacturing method of the present invention.

3: heating cylinder

4: heater

5: Screw

7: head

9: Thin section

71: Gas outlet

72: Gas flow path

73a: Resin ejection needle (raw material ejection outlet)

73b: Resin ejection needle mounting part

74a: Resin ejection needle grip

74b: Adjustment Department

75: Resin flow path

77: Heating cylinder cover

78: Resin discharge means holding ring

B: line

C: line

D: line

Claims (9)

A nanofiber manufacturing device (1), which comprises: High-pressure gas ejection means (71) for ejecting high-pressure gas flow (90); and A plurality of liquid raw material ejection means (73) for ejecting liquid raw material to the high-pressure gas flow (90) ejected by the high-pressure gas ejection means (71), wherein The liquid raw material ejection means (73) is arranged centering on the high-pressure gas flow (90) ejected by the high-pressure gas ejection means (71), It is characterized by The angle adjusting means (74) can adjust the installation angle (θ) of the liquid raw material ejecting means (73) with respect to the high-pressure gas flow (90) ejected by the high-pressure gas ejecting means (71). The nanofiber manufacturing device (1) according to claim 1, wherein the liquid raw material discharging means (73) is equipped with an extrusion device (5) for melting and extruding raw materials, and the liquid raw materials The sexual raw material discharge means (73) discharges the raw material melted and extruded by the extrusion device (5) as a liquid raw material. The nanofiber manufacturing device (1) according to claim 1, wherein the liquid raw material discharge means (73) is equipped with a reservoir (5A) for supplying dissolved raw material, and the liquid raw material The discharge means (73) discharges the dissolved raw material as a liquid raw material. The nanofiber manufacturing device (1) according to any one of claims 1 to 3, wherein the high-pressure gas ejection means (71) is equipped with a gas supply means for supplying high-pressure and high-temperature gas, and the high-pressure gas The ejection means (71) ejects the high-pressure and high-temperature gas as a high-pressure gas flow (90). The nanofiber manufacturing device (1) according to any one of claims 1 to 4, wherein at least two of the liquid raw material ejection means (73) are relative to the high-pressure gas ejection means (71) Configured symmetrically. The nanofiber manufacturing device (1) according to any one of claims 1 to 5, wherein the liquid raw material ejection means (73) is used for the high-pressure gas flow ejected by the high-pressure gas ejection means (71) The surroundings of (90) are arranged at equal intervals. The nanofiber manufacturing device (1) according to any one of claims 1 to 6, wherein the high-pressure gas flow (90) sprayed by the high-pressure gas spraying means (71) is installed in the device (1) The direction in which the setting surface is perpendicular. A method for manufacturing nanofibers using the nanofiber manufacturing device (1) according to any one of claims 1 to 7, wherein The high-pressure gas flow (90) is sprayed out by the high-pressure gas spraying means (71), The liquid raw material is discharged from the liquid raw material discharge means (73) to the high-pressure gas flow (90) discharged by the high-pressure gas discharge means (71), and When the liquid raw material ejection means (73) ejects the liquid raw material to the high-pressure air flow (90) as the center, the angle adjusting means (74) is used to adjust the liquid raw material ejection means (73). ) The discharge angle (θ) of the discharged liquid raw material with respect to the high-pressure airflow (90). A method of manufacturing nanofibers using a nanofiber manufacturing device (1), the nanofiber manufacturing device (1) includes a heating cylinder (3) to which raw materials are supplied, and a heating means for heating the heating cylinder (3) ( 4), and an extrusion device (5) for extruding raw materials in the heating cylinder (3), wherein, in the method, A gas jet port (71) for injecting high-pressure gas is provided at the end of the heating cylinder (3), A plurality of raw material ejection means (73) for ejecting the raw material in the molten state in the heating cylinder (3) is provided around the gas ejection port (71), and The heating cylinder (3) is heated by the heating means (4), the raw material supplied to the inside of the heating cylinder (3) is melted or the raw material is maintained in a molten state, and the extrusion device (5) ) The raw material is extruded and ejected from the raw material ejection means (73), the gas ejected from the gas ejection port (71) generates an air flow, and the ejected raw material is mounted on the outer periphery of the ejected gas flow to make It stretches to obtain fibers with nanometer diameter.

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