CN111542652A

CN111542652A - Discharge nozzle for nanofiber manufacturing apparatus and nanofiber manufacturing apparatus having discharge nozzle

Info

Publication number: CN111542652A
Application number: CN201880054273.0A
Authority: CN
Inventors: 池谷守彦; 越前谷孝嗣; 曾田浩义
Original assignee: Saint Force Inc
Current assignee: Saint Force Inc; M Techx Inc
Priority date: 2017-06-21
Filing date: 2018-06-20
Publication date: 2020-08-14
Also published as: CA3104610A1; RU2020102026A3; ZA201908535B; JPWO2018235866A1; AU2018289746A1; RU2020102026A; KR20200042460A; SG11202105386VA; EP3670712A1; EP3670712A4; TW201920787A; US20210317600A1; WO2018235866A1

Abstract

The present invention has been made to solve the problem of providing a discharge nozzle for a nanofiber manufacturing apparatus, which can improve the versatility and operability of the apparatus by easily changing the specifications such as the diameter of a fiber to be manufactured when manufacturing a nanofiber, and a nanofiber manufacturing apparatus provided with the discharge nozzle. A discharge nozzle (2) attached to a nanofiber manufacturing apparatus (1) has a split nozzle unit (6), and the split nozzle unit (6) is provided with: a molten/dissolved resin discharge port (9) for discharging the molten/dissolved resin, a molten/dissolved resin flow path (10) for feeding the molten/dissolved resin to the molten/dissolved resin discharge port (9), a hot air discharge port (11) for discharging hot air, and a hot air flow path (12) for feeding the hot air to the hot air discharge port (11). The split nozzle unit (6) is arranged so as to be capable of being split into first to fourth nozzle units (6a to 6 d).

Description

Discharge nozzle for nanofiber manufacturing apparatus and nanofiber manufacturing apparatus having discharge nozzle

Technical Field

The present invention relates to a discharge nozzle for a nanofiber manufacturing apparatus for manufacturing a fine fiber, and a nanofiber manufacturing apparatus having the discharge nozzle.

Background

Nanofibers are used in various fields by utilizing the characteristics of microfibers. In recent years, there has been a demand for production of nanofibers, such as nonwoven fabrics made of ultrafine fibers, which are formed by winding fibers of various diameters and lengths in a complicated manner depending on the application. For example,

patent documents

1 and 2 disclose techniques for producing microfibers. The ultrafine fiber production apparatuses disclosed in

patent documents

1 and 2 include substantially the same meltblowing pipe headers. The ultrafine fiber manufacturing apparatus includes: one or more liquid nozzles capable of ejecting a heated molten resin (patent document 1) or a polymer solution obtained by dissolving a raw material polymer in a solvent (patent document 2); and one or more hot air nozzles for discharging hot air to the molten resin or polymer solution discharged from the liquid nozzle and drawing the molten resin or polymer solution into a fibrous form.

Patent documents

1 and 2 disclose techniques for stably spinning a molten resin into fine fibers with a small amount of hot air using an ultrafine fiber production apparatus.

Documents of the prior art

Patent document

Patent document 1 Japanese patent No. 5946569

Patent document 2 Japanese patent No. 5946565

Disclosure of Invention

Problems to be solved by the invention

However, in the ultrafine fiber production apparatuses described in

patent documents

1 and 2, for example, when fibers having different fiber diameters are to be produced, the diameters and inclinations of the liquid nozzles and the hot air nozzles cannot be appropriately changed. In order to change such conventional liquid nozzles and hot air nozzles, only the entire tube head is replaced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a discharge nozzle for a nanofiber manufacturing apparatus, which can easily change the specification of the diameter of a fiber to be manufactured, and the like, and improve the versatility and operability of the apparatus, and a nanofiber manufacturing apparatus provided with the discharge nozzle.

Means for solving the problems

The discharge nozzle attached to a nanofiber manufacturing apparatus according to the present invention is a discharge nozzle attached to a nanofiber manufacturing apparatus that discharges a molten/dissolved resin discharged from a molten/dissolved resin discharge port so as to be guided by hot air discharged from a hot air discharge port, and stretches the molten/dissolved resin into a fibrous form to form microfibers, the discharge nozzle comprising:

the discharge nozzle has a split nozzle unit in which a molten/dissolved resin discharge port and a hot air discharge port are formed and which is capable of being split into a plurality of units.

Further, a discharge nozzle to be attached to a nanofiber manufacturing apparatus according to the present invention is characterized in that: the split nozzle unit may be divided into a plurality of segments so as to divide at least one of the molten/dissolved resin flow path and the hot air flow path.

Further, a discharge nozzle to be attached to a nanofiber manufacturing apparatus according to the present invention is characterized in that: the split joint of the split nozzle unit is provided with a sealing plate having a packing structure or the like, which maintains airtightness of the split joint, is adapted to the temperature of hot air used and the characteristics of a molten/dissolved resin, and is made of a metal or a special material having excellent heat resistance, pressure resistance, and chemical resistance.

Further, a discharge nozzle attached to a nanofiber manufacturing apparatus according to the present invention is characterized in that: the split nozzle unit is composed of first to fourth nozzle units, and has a molten/dissolved resin inflow unit as the first nozzle unit, a hot air inflow unit as the second nozzle unit, a resin/hot air introduction unit as the third nozzle unit, and a discharge unit as the fourth nozzle unit.

The discharge nozzle attached to a nanofiber manufacturing apparatus according to the present invention is a discharge nozzle attached to a nanofiber manufacturing apparatus that discharges a molten/dissolved resin discharged from a molten/dissolved resin discharge port so as to be guided by hot air discharged from a hot air discharge port, and forms fine fibers by drawing the molten/dissolved resin into a fibrous form, the discharge nozzle comprising:

the discharge nozzle has a divisional nozzle unit divisible into a plurality of units,

the hot air outlet is formed as a rectangular slit-shaped hot air outlet on the front wall surface of the split nozzle unit,

the molten/dissolved resin discharge port is a molten/dissolved resin discharge port group composed of a plurality of discharge ports arranged linearly, the molten/dissolved resin discharge port group being formed on a front wall surface of the split nozzle unit,

the molten/dissolved resin discharge port group is arranged along the longitudinal direction of the hot air discharge port.

The nanofiber manufacturing apparatus of the present invention is a nanofiber manufacturing apparatus for forming fine fibers by discharging a molten/dissolved resin discharged from a molten/dissolved resin discharge port so as to be guided by hot air discharged from a hot air discharge port, and drawing the molten/dissolved resin into a fibrous form, the nanofiber manufacturing apparatus comprising:

the nanofiber manufacturing apparatus has a discharge nozzle having a divisional nozzle unit divisible into a plurality of units,

the molten/dissolved resin discharge port is a molten/dissolved resin discharge port group composed of a plurality of discharge ports arranged linearly, the molten/dissolved resin discharge port group composed of the plurality of discharge ports is formed on a front wall surface of the split nozzle unit,

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the discharge nozzle is configured to be dividable into a plurality of units. Thus, when manufacturing nanofibers having a desired fiber diameter, a part of the divided nozzle unit having the molten/dissolved resin discharge port or the hot air discharge port formed therein can be divided and replaced. Therefore, the unit can be easily replaced with a unit having a molten/dissolved resin discharge port or a hot air discharge port so as to meet a desired specification such as a fiber diameter. This makes it possible to provide a fiber which is excellent in replacement workability, can be operated in a shorter time, and can be produced at a lower cost, and a nonwoven fabric comprising the fiber.

Further, in the production of the nonwoven fabric, hot air is discharged from a hot air discharge port formed as one slit, whereas molten/dissolved resin is simultaneously discharged from a molten/dissolved resin discharge port group composed of a plurality of discharge ports arranged linearly. Thereby, the discharge of the molten/dissolved resin from each molten/dissolved resin discharge port can be optimized for the hot air. This can suppress the variation in the quality of the fibers to be formed, and can obtain high-quality nanofibers.

Further, the divided nozzle units can be easily assembled integrally by a fixing device such as a bolt. Therefore, the time required for the complicated assembling and disassembling operation can be shortened, and the cost of the produced fiber can be kept low.

Drawings

Fig. 1 is a perspective view showing a split nozzle attached to a nanofiber manufacturing apparatus as one embodiment of the present invention.

Fig. 2 is an enlarged front view of the split nozzle of fig. 1, and is an enlarged view of a portion shown by an alternate long and short dash line of fig. 1.

Fig. 3 is a longitudinal sectional view of the divisional nozzle of fig. 1.

Fig. 4 is a longitudinal sectional view of a divisional nozzle attached to a nanofiber manufacturing apparatus as another embodiment of the present invention.

Fig. 5 is a cross-sectional view along a hot air flow path formed in a split nozzle attached to a nanofiber manufacturing apparatus as one embodiment of the present invention, and fig. 5 is an example of a cross-sectional view taken along line a-a in fig. 3 and 4.

Fig. 6 is a cross-sectional view along a solution flow path formed in a split nozzle attached to a nanofiber manufacturing apparatus as one embodiment of the present invention, and fig. 6 is an example of a cross-sectional view taken along line B-B in fig. 3 and 4.

Fig. 7 is a longitudinal sectional view of a main part of a fourth nozzle unit constituting a divisional nozzle attached to a nanofiber manufacturing apparatus as one embodiment of the present invention.

Fig. 8 is a schematic view showing a positional relationship between a molten/dissolved resin discharge port and a hot air discharge port formed in a split nozzle attached to a nanofiber manufacturing apparatus as one embodiment of the present invention.

Fig. 9 is a cross-sectional view showing a modification of a pipe head disposed in a split nozzle attached to a nanofiber manufacturing apparatus as one embodiment of the present invention.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to fig. 1 to 9. Of course, the present invention is not limited to the specific embodiments described in the present embodiment. The present invention is not limited to the embodiments described above, and various modifications, additions, deletions, and design changes may be made to the embodiments by those skilled in the art without departing from the spirit of the invention. In the description of the present application, "front" refers to the left direction in fig. 3 and 4.

The structure of the divided discharge nozzle 2 attached to the nanofiber manufacturing apparatus 1 of the present embodiment will be described with reference to fig. 1 to 9. The nanofiber manufacturing apparatus 1 discharges the molten/dissolved resin discharged from the molten/dissolved resin discharge port 9 so as to be guided by the hot wind discharged from the hot wind discharge port 11, and stretches the molten/dissolved resin into a fibrous shape to form a fine fiber. In the nanofiber manufacturing apparatus 1 equipped with the discharge nozzle 2 in this example, hot air is discharged to the discharged molten resin or the resin dissolved in the solvent (in the present invention, referred to as "molten/dissolved resin") and the molten/dissolved resin is elongated into a long fiber shape having an extremely fine diameter to manufacture a long fiber having an extremely fine diameter. A discharge nozzle 2 for discharging the molten/dissolved resin attached to the nanofiber manufacturing apparatus 1 is connected to a molten/dissolved resin supply apparatus 3 (details are not shown) for introducing the resin melted by heating or the resin dissolved in the solvent and a hot air supply apparatus 4 (details are not shown) for introducing hot air.

The discharge nozzle 2 has a split-type nozzle unit 6. The split nozzle unit 6 can be split into first to fourth nozzle units 6a to 6 d. The first to fourth nozzle units 6a to 6d are arranged in order from the right side to the left side in fig. 3 and 4. A sealing plate 7 for maintaining airtightness is interposed at the divided joint portion which is the adjacent portion of the first to fourth nozzle units 6a to 6 d. That is, the seal plate 7 is sandwiched between the first nozzle unit 6a and the second nozzle unit 6b, between the second nozzle unit 6b and the third nozzle unit 6c, and between the third nozzle unit 6c and the fourth nozzle unit. The sealing plate 7 is made of a metal or a special material having excellent heat resistance, pressure resistance, and chemical resistance depending on the temperature of hot air used and the characteristics of the molten/dissolved resin. The first to fourth nozzle units 6a to 6d divided into four are integrated by a fixing device 8 such as a bolt penetrating the whole. The split nozzle unit 6 is arranged so as to be able to split the molten/dissolved resin flow path 10 and the hot air flow path 12 into a plurality of pieces (in fig. 3 and 4, the split nozzle unit is split in the vertical direction and each nozzle unit is split in the horizontal direction). The split nozzle unit 6 may be disposed so as to be capable of splitting only one of the molten/dissolved resin flow path 10 and the hot air flow path 12. The number of divisions of the divisional nozzle unit 6 of this embodiment is four. The number of the divided nozzle units 6 is determined according to the embodiment, for example, according to the ease of processing the molten/dissolved resin flow path 10 and the hot air flow path 12, or according to each function of the divided nozzle units 6. In the present embodiment, a plurality of nozzle units are coupled by a fixing device 8 such as a bolt shown in the figure. In addition, according to the arrangement of each nozzle unit and the embodiment thereof, a fixing device (not shown) provided on the outer periphery of each nozzle unit may be used instead of penetrating the entire nozzle unit.

Further, although not shown in detail, the discharge nozzle 2 may be divided into, for example, upper and lower parts (cut in the left-right direction in fig. 3 and 4, and the nozzle units may be divided in the up-down direction) depending on the ease of processing the molten/dissolved resin flow path 10 or the hot air flow path 12 inside. In such a configuration, for example, the upper and lower portions may be integrally fastened by the (belt type) unit heater 5 for each nozzle unit having a fastening device (not shown) and a bolt.

In the present embodiment, the split nozzle unit 6 is composed of a molten/dissolved resin inflow unit 6a as a first nozzle unit, a hot air inflow unit 6b as a second nozzle unit, a resin/hot air introduction unit 6c as a third nozzle unit, and a discharge unit 6d as a fourth nozzle unit. In the first to fourth nozzle units 6a to 6d, the molten/dissolved resin flow path 10 (molten/dissolved resin flow paths 10a to 10d) is formed. Thereby, the molten/dissolved resin supplied from the molten/dissolved resin supply device 3 is sent out through the molten/dissolved resin flow path 10 to the molten/dissolved resin discharge port 9 located on the downstream side of the fourth nozzle unit (discharge unit) 6 d. The molten/dissolved resin discharge port 9 is provided in connection with the downstream end of the molten/dissolved resin flow path 10.

The molten/dissolved resin flow path 10 is formed continuously from the first nozzle unit 6a to the fourth nozzle unit 6 d. The molten/dissolved resin discharge port 9 of the fourth nozzle unit 6d is formed in a circular shape with an extremely small diameter on the discharge side. The diameter of the molten/dissolved resin discharge port 9 is determined in accordance with the specification of the shape (for example, fiber diameter) of the extremely fine fiber to be produced. As shown in fig. 2, the molten/dissolved resin discharge port 9 is a discharge port group (hereinafter referred to as "molten/dissolved resin discharge port group" 9-1 to 9-12 ") composed of a plurality of discharge ports 9-1 to 9-12 (12 discharge ports in the illustrated embodiment) arranged in a straight line along the longitudinal direction of a slit-shaped hot air discharge port 11 described later. The groups of molten/dissolved resin outlets 9-1 to 9-12 are arranged in a straight line in the horizontal direction on an inclined surface 22 provided on the front wall surface 6e of the split nozzle unit 6 (fig. 1). The inclined surface 22 will be described later.

As shown in fig. 5, the molten/dissolved resin flow path 10 is formed as a single flow path 10a in the first nozzle unit 6a located on the most upstream side of the split nozzle unit 6. The molten/dissolved resin flow path 10 is divided into a plurality of (four in the embodiment) flow paths 10b and … … and flow paths 10c and … … in the 2 nd nozzle unit 6b and the third nozzle unit 6 c. In the fourth nozzle unit 6d, the molten/dissolved resin flow path 10 is again merged with one flow path 10d and then divided into a plurality of (12 in the embodiment) flow paths (molten/dissolved resin discharge port groups 9-1 to 9-12). The molten/dissolved resin discharge ports 9 (molten/dissolved resin discharge port groups 9-1 to 9-12) formed in the fourth nozzle unit 6d are opened (opened) in the normal direction of the inclined surface 22.

As shown in fig. 3, 4, and 6, hot air flow paths 12 are formed in the second to fourth nozzle units 6b to 6 d. The hot air flow path 12 sends the hot air supplied from the hot air supply device 4 to the hot air discharge port 11 located on the downstream side of the fourth nozzle unit 6 d. The hot air flow path 12 may be directed obliquely upward from the air reservoir 14 having a large volume toward the one horizontally long rectangular slit-shaped hot air discharge port 11 (fig. 3), or may be directed horizontally from the air reservoir 14 toward the slit-shaped hot air discharge port 11 (fig. 4).

The hot air flow path 12 is formed continuously from the second nozzle unit 6b to the fourth nozzle unit 6 d. The hot air supply device 4 supplies hot air to the second nozzle unit 6b through the hot air inlet 18. The second nozzle unit 6b has an air reservoir 14, and the air reservoir 14 has a predetermined large volume in order to suppress rapid pressure fluctuations in the hot air flow path 12.

As shown in fig. 6, the third nozzle unit 6c is provided with a plurality of partition walls 15 (11 in the present embodiment), and the partition walls 15 rectify the hot air sent out through the air reservoir 14 of the second nozzle unit 6b in a horizontal line. Thus, in the third nozzle unit 6c, the hot air flow path 12 is divided into 12 (hot air flow paths 12-1 to 12-12). Therefore, the hot air to be sent is relatively equally branched into a plurality of paths in the third nozzle unit 6 c. In the example shown in FIG. 9, the hot air flow path is shown by reference numeral 12c and divided into 12 (hot air flow paths 12-1 to 12-12).

As shown in fig. 6, the fourth nozzle unit 6d has one hot air passage space 12d communicating with the hot air passages 12(12-1 to 12-12) divided by the third nozzle unit 6c, without providing a partition wall or the like in the hot air passage 12. That is, as shown in fig. 6, one rectangular parallelepiped hot air path space 12d is formed. The hot air passage space 12d is formed as a horizontally long linear rectangular slit-shaped hot air outlet 11 with respect to the front surface of the apparatus, and the hot air passage space 12d is formed from the upstream end to the downstream end of the fourth nozzle unit 6d (the hot air outlet 11 located on the front wall surface of the apparatus). The hot air outlet 11 is connected to the downstream end of the hot air flow path 12.

In this way, a plurality of partitions 15 for rectifying hot air and one hot air passage space 12d for collecting the hot air rectified by the partitions are formed in the hot air passage 12. That is, instead of providing one hot air outlet for one resin outlet, one long slit-shaped hot air outlet is provided for a plurality of resin outlets. Thus, by forming a uniform hot air discharge flow to the resin discharged from the plurality of resin discharge ports, uniform nanofibers can be produced over the entire length of the horizontally long slit.

In the embodiment shown in fig. 6, one horizontally long slit-shaped hot air discharge port 11 (discharge port of one hot air passage space 12d) is formed in the fourth nozzle unit 6d, and a plurality of partition walls 15 are formed in the third nozzle unit 6c, but the arrangement shown in the modification of fig. 9 may be adopted. In the modification of fig. 9, the partition wall 15 extends from the third nozzle unit 6c to approximately the middle of the fourth nozzle unit 6 d. In this configuration, the hot air path space 12d is formed from the middle portion to the downstream end (the slit-shaped hot air discharge port 11 located on the wall surface) of the fourth nozzle unit 6d, and one horizontally long hot air path space 12d is opened (opened) to the low vertical surface 20 in front of the apparatus.

The relationship between the molten/dissolved resin discharge port 9 and the hot air discharge port 11 will be described. As shown in fig. 7, the front wall surface 6e of the fourth nozzle unit 6d has a low vertical surface 20 and a high vertical surface 21 which are parallel to each other. The high vertical surface 21 is disposed forward (shifted forward) of the low vertical surface 20. The low vertical surface 20 and the high vertical surface 21 are connected by an inclined surface 22. The inclined surface 22 is inclined with respect to the low-vertical surface 20 and the high-vertical surface 21.

One rectangular slit-shaped hot air outlet 11 is formed in the low vertical surface 20, and groups 9-1 to 9-12 (12 in the present embodiment) of molten/dissolved resin outlets are formed in the inclined surface 22 in the direction of the normal to the inclined surface 22. Therefore, the discharge direction (discharge angle) of the molten/dissolved resin with respect to the hot air discharged is changed by adjusting the inclination angle of the inclined surface 22. That is, by preparing a plurality of nozzle units having different inclination angles of the inclined surface 22 in advance, it is possible to select a nozzle unit having an inclination angle (angle at which the molten/dissolved resin and the hot air intersect) corresponding to a desired specification such as a fiber diameter. In addition to the above-described inclination angle, nozzle units having different diameters or numbers of the molten/dissolved resin discharge port groups 9-1 to 9-12 and nozzle units having different configurations of the hot air discharge ports 11 (shapes, numbers of the partition walls 15, etc.) may be selected.

As shown in fig. 7 and 8, the molten/dissolved resin discharge port 9 and the hot air discharge port 11 are arranged at extremely close positions. The circular molten/dissolved resin discharge port 9 is formed in a direction (normal direction) orthogonal to the inclined surface 22. With this configuration, when the molten/dissolved resin discharge ports 9 (molten/dissolved resin discharge port groups 9-1 to 9-12) are machined, the drill abuts perpendicularly to the inclined surface 22, so that the drill does not slip. Therefore, the molten/dissolved resin discharge port 9 can be perforated into a circular shape with high accuracy even by machining with a drill or the like. Therefore, the molten/dissolved resin discharge port 9 having a small diameter can be formed with high accuracy.

In the fourth nozzle unit (discharge unit) 6d of the discharge nozzle 2 of the present embodiment shown in fig. 8, a molten/dissolved resin discharge port group 9-1 to 9-12 including 12 discharge ports for discharging molten/dissolved resin and one slit-shaped hot air discharge port 11 for discharging hot air are formed. Further, 11 partition walls 15 are provided in the third nozzle unit (resin/hot air introduction unit) 6 c. Therefore, in the present embodiment, the number of the molten/dissolved resin discharge ports 9 (molten/dissolved resin discharge port groups 9-1 to 9-12) corresponds to the number of the hot air flow paths 12(12-1 to 12-12) and corresponds to the discharge direction (the left-right direction in fig. 8) in a one-to-one manner. The present invention is not limited to this configuration, and for example, 12 partition walls 15 may be provided in the third nozzle unit (resin/hot air introduction unit) 6c to form 13 hot air flow paths 12(12-1 to 12-13). The number of the molten/dissolved resin discharge ports 9 (molten/dissolved resin discharge port groups 9-1 to 9-12) and the number of the hot air flow paths 12(12-1 to 12-13) do not necessarily have to be the same. For example, the molten/dissolved resin discharge ports 9 may be 12 in number, the hot air flow paths 12 in the third nozzle unit 6c may be 13 in number, and the ports may be arranged so as to be shifted in a direction (vertical direction in fig. 8) perpendicular to the discharge direction.

As described above, the nanofiber manufacturing apparatus 1 according to the present embodiment can be provided in which the molten/dissolved resin discharged from the molten/dissolved resin discharge port group 9-1 to 9-12 including a plurality of discharge ports is discharged to the hot wind discharged from the hot wind discharge port 11 having a slit shape by the discharge nozzle 2 attached to the nanofiber manufacturing apparatus 1, and the molten/dissolved resin is formed into a fiber shape by stretching. The discharge nozzle 2 of the present embodiment further includes a split nozzle unit 6, and the split nozzle unit 6 is provided with a molten/dissolved resin discharge port 9 for discharging molten/dissolved resin, a molten/dissolved resin flow path 10 for feeding the molten/dissolved resin to the molten/dissolved resin discharge port 9 (molten/dissolved resin discharge port groups 9-1 to 9-12), a hot air discharge port 11 for discharging hot air, and a hot air flow path 12 for feeding hot air to the hot air discharge port 11.

Further, the nanofiber manufacturing apparatus 1 of the present embodiment includes: a molten/dissolved resin supply device 3 for introducing a molten/dissolved resin into a molten/dissolved resin flow path 10 provided in the split nozzle unit 6, and a hot air supply device 4 for introducing hot air into a hot air flow path 12 provided in the split nozzle unit 6. The split nozzle unit 6 is arranged to be dividable into first to fourth nozzle units 6a to 6 d.

More specifically, the split nozzle unit 6 is divided into a plurality of divided molten/dissolved resin flow paths 10 and hot air flow paths 12. Thus, a plurality of different nozzle units that can be applied to various fiber specifications are provided in advance, and a part of the nozzle units can be easily replaced according to the fiber specifications. For example, when the specification of the manufactured fiber is changed, the fourth nozzle unit 6d in which the molten/dissolved resin discharge port 9 and the hot air discharge port 11 are formed may be taken out and simply replaced with the fourth nozzle unit 6d in which the molten/dissolved resin discharge port 9 and the hot air discharge port 11 corresponding to the changed specification of the fiber are formed. Therefore, the operability in producing the desired nanofibers is excellent, the working time can be shortened, and further, the fine fibers and the nonwoven fabric made of the fibers can be efficiently provided at low cost.

Further, in the discharge nozzle 2 of the present embodiment, a molten/dissolved resin discharge port group 9-1 to 9-12 including a plurality of discharge ports is formed, and the molten/dissolved resin is discharged from the plurality of discharge ports and the hot air is discharged from a hot air discharge port 11 formed as a single slit arranged in a horizontal direction. Thus, the amount of hot air discharged can be made uniform with respect to the molten/dissolved resin discharged from each of the molten/dissolved resin discharge port groups 9-1 to 9-12. This prevents the quality of the formed fiber from being uneven, and a high-quality fiber can be obtained.

Further, since the divided first to fourth nozzle units 6a to 6d can be easily assembled into one body by the fixing mechanism 8 formed of a bolt or the like, the time required for complicated assembling and disassembling operations can be shortened, and the manufactured fibers can be controlled at low cost.

The present embodiment has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. In the present embodiment, the molten/dissolved resin flow path 10 and the hot air flow path 12 are formed in each of the first to fourth nozzle units 6a to 6d which can be divided into four, but the portions in which the molten/dissolved resin flow path 10 and the hot air flow path 12 are formed may be further divided. Of course, the number of division units can also be reduced.

Description of the symbols

1: a nanofiber manufacturing apparatus;

2: a discharge nozzle;

3: a molten/dissolved resin supply device;

4: a hot air supply device;

5: a heater for a (belt) unit;

6: a split type nozzle unit;

6 a: a first nozzle unit (molten/dissolved resin inflow unit);

6 b: a second nozzle unit (hot air inflow unit);

6 c: a third nozzle unit (resin/hot air introduction unit);

6 d: a fourth nozzle unit (discharge unit);

6 e: a front wall surface;

7: a sealing plate;

8: a fixing mechanism;

9: a molten/dissolved resin discharge port;

9-1 to 9-12: a molten/dissolved resin discharge port group;

10: a molten/dissolved resin flow path;

11: a slit-shaped hot air outlet;

12: hot air flow paths (12 a-12 d);

14: an air reservoir;

15: a partition wall;

18: a hot air inlet;

20: a low vertical plane;

21: a high vertical plane;

22: an inclined surface.

Claims

1. A discharge nozzle mounted to a nanofiber manufacturing apparatus that discharges a molten/dissolved resin discharged from a molten/dissolved resin discharge port in a manner to be guided by hot air discharged from a hot air discharge port, thereby drawing the molten/dissolved resin into a fibrous form to form microfibers, characterized in that:

the discharge nozzle has a split nozzle unit that can be split into a plurality of units, and a molten/dissolved resin discharge port and a hot air discharge port are formed in the split nozzle unit.

2. The discharge nozzle attached to the nanofiber manufacturing apparatus as set forth in claim 1, wherein:

the split nozzle unit may be configured to split at least one of the molten/dissolved resin flow path and the hot air flow path into a plurality of pieces.

3. The discharge nozzle installed in the nanofiber manufacturing apparatus as set forth in claim 1 or 2, wherein:

a sealing plate for maintaining airtightness of the split joint portion is interposed in the split joint portion of the split nozzle unit.

4. The discharge nozzle installed in the nanofiber manufacturing apparatus as set forth in claim 1, wherein:

the split nozzle unit has a molten/dissolved resin inflow unit as a first nozzle unit, a hot air inflow unit as a second nozzle unit, a resin/hot air introduction unit as a third nozzle unit, and a discharge unit as a fourth nozzle unit.

5. A discharge nozzle mounted to a nanofiber manufacturing apparatus that discharges a molten/dissolved resin discharged from a molten/dissolved resin discharge port in a manner to be guided by hot air discharged from a hot air discharge port, thereby drawing the molten/dissolved resin into a fibrous form to form microfibers, characterized in that:

the discharge nozzle has a split-type nozzle unit that can be split into a plurality of units,

6. A nanofiber manufacturing apparatus that discharges a molten/dissolved resin discharged from a molten/dissolved resin discharge port so as to be guided by hot air discharged from a hot air discharge port, thereby drawing the molten/dissolved resin into a fibrous form to form microfibers, characterized in that:

the nanofiber manufacturing apparatus includes a discharge nozzle having a split nozzle unit that can be split into a plurality of units,