JP2010168684A - Microwave drawing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing machine for drawing a filamentous material comprising an organic synthetic material by adding a tensile force to the filamentous material while heating the material, and capable of carrying out the miniaturization of an installation and high-speed drawing. <P>SOLUTION: The microwave drawing machine is constituted by forming a part of a waveguide circuit for transmitting a microwave power from microwave oscillator 21 as an applicator body 28, forming a heating passage for heating the filamentous material 100 while stretching the filamentous material 100 in the applicator body 28, and concentrating the microwave field to the heating passage of the applicator body 28 by transmitting the microwave power in a single transmission mode in the waveguide. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stretching apparatus that stretches a filamentous material by pulling it while heating the filamentous material using microwave heating means in a process of producing a filamentous material of an organic synthetic material such as PVA (polyvinyl alcohol).

  In the process of producing a filamentous filament made of an organic synthetic material such as PVA (polyvinyl alcohol) (hereinafter simply referred to as “filamentous product”), there is a step of stretching the filamentous material. This is an important process since it has the effect of uniformly aligning the directions of the constituent molecules, and as a result, the strength of the filamentous material is improved.

In the stretching step, a plurality of filamentous materials may be stretched in a bundle.
In such a stretching step, a filamentous material having a desired size is produced by applying a tensile force while heating the filamentous material using hot air, an electric heater, or the like.

  In general, hot air, steam, infrared heaters, etc. are used as the heating means used in the stretching process. In such a heating means, heat is diffused from the surface of the filamentous material toward the center. Therefore, when stretching a thick thread with a material having poor thermal conductivity or when stretching a plurality of thin threads together as a thick thread, a preheating step of at least about 1 minute is required. It must be provided as a pre-stage of the stretching process and heated up to the temperature required for stretching.

  Therefore, in such a stretching process, in the case of high-speed stretching such as 50 m per minute at the entrance, the preliminary heating process provided as the preceding process is provided with a room capable of heating and accommodating a maximum of 50 m of filamentous material. A heating furnace is required to perform the process.

And the winding side of an extending process becomes high speed about 5 to 15 times, and becomes the next aging process.
For this reason, the conventional extending | stretching process equips the large-scale heating furnace and the extending | stretching apparatus which requires big energy.

In such a stretching process, when the film is stretched at a high speed, the range of the filamentous material that has reached a stretchable temperature becomes long, the stretching point is blurred, and the quality may deteriorate.
Therefore, in the conventional stretching process, as described above, the stretching point may be blurred and the quality may be deteriorated, so that high-speed stretching becomes difficult from the viewpoint of quality and productivity.

On the other hand, a stretching apparatus having a microwave power source as a heating means has already been proposed.
In this stretching apparatus, as shown in FIG. 18, water is applied to the surface of the monofilament 12 that is a filament by the water applicator 11, and then the monofilament 12 is sent into the microwave cavity 13. Electric power is irradiated.
The microwave cavity 13 is configured such that the microwave power output from the microwave source 14 is sent through the waveguide 15.

Therefore, the water coated on the surface of the monofilament 12 is heated, and the monofilament 12 is heated to induce stretching.
Therefore, the heating means of the microwave power source provided in this stretching apparatus has the same problem as described above because the heat is diffused and transmitted from the surface of the filamentous material toward the center.

JP 07-505455 A

  In view of the above-described circumstances, the present invention has an object to solve the problems of large-scale and high-speed stretching, which are problems of conventional stretching apparatuses.

  In order to achieve the above-described object, in the present invention, as a first invention, a microwave power is transmitted from a microwave oscillator in a stretching apparatus that draws and stretches a filamentous material made of an organic synthetic material while heating. A part of the waveguide is formed as an applicator, and the applicator is formed with a heating passage through which the filament is passed, and further, microwave power in a single transmission mode is transmitted to the waveguide. Thus, a microwave stretching apparatus is proposed in which a microwave electric field is concentrated in the heating passage of the applicator.

  As a second invention, in the microwave stretching apparatus of the first invention described above, a plurality of microwave stretching apparatuses are connected so as to communicate the heating passages, and the waveguides of the respective microwave stretching apparatuses are connected. A microwave stretching apparatus characterized by controlling the power value of the microwave power to be transmitted is proposed.

  As a third invention, in the microwave stretching apparatus of the first invention described above, an insulating pipe that forms the heating passage is arranged in the applicator, and air is sent into the insulating pipe. A microwave stretching apparatus characterized by the following is proposed.

  As a fourth invention, in the microwave stretching apparatus of the first invention described above, the first power adjusting means for adjusting the power value of the microwave power by controlling the anode current of the magnetron included in the microwave oscillator; And a second power adjustment means comprising a microwave variable attenuator for controlling the power value of the microwave power by controlling a variable reactance element provided in the waveguide, and the first and second power adjustments. A microwave stretching apparatus is proposed in which the power value of the microwave power is adjusted in combination with the means.

In the first invention, a part of the waveguide is formed as an applicator, and microwave power in a single transmission mode is propagated through the waveguide to concentrate the microwave electric field in the heating path in the applicator.
Therefore, since the filamentous material passing through the heating passage is rapidly heated from the inside, high-speed stretching is possible, and it is possible to reduce the size of the stretching device, shorten the stretching process time, and save energy.

  That is, when the applicator is formed of a rectangular waveguide, microwave power in the TE10 mode or TM11 mode, which is a single transmission mode, is transmitted to the waveguide, and the cylindrical waveguide is used for application. When the microwave power of TM01 mode is transmitted to the waveguide, the microwave electric field appears at a specific position and direction, so that the heating path of the applicator It is possible to concentrate the microwave electric field.

More specifically, when TE10 mode microwave power is transmitted to a rectangular waveguide, the center of the long side of the rectangular cross section orthogonal to the tube axis of the rectangular waveguide exhibits the strongest electric field. The direction of the electric field is a direction parallel to the short side of the rectangular cross section.
Therefore, the filamentous material can be stretched by arranging the filamentous material in the direction of the strongest electric field at this position.

When TM11 mode microwave power is transmitted to the rectangular waveguide, the electric field is strongest at the center of the rectangular cross section orthogonal to the tube axis of the rectangular waveguide, and the direction of the electric field is determined by the tube of the waveguide. A combination of the axial direction and the radial direction centering on the central portion is obtained.
Therefore, the direction in which the filamentous material is arranged is on an arbitrary line passing through the center in the cross section perpendicular to the tube axis direction or the tube axis.
When the filamentous material is on an arbitrary line passing through the center in the cross section orthogonal to the tube axis, it is efficient to run the filamentous material parallel to the long side of the rectangular cross section orthogonal to the tube axis.

When TM01 mode microwave power is transmitted to the circular waveguide, the same electric field distribution is obtained as when TM11 mode microwave power is transmitted to the rectangular waveguide.
Therefore, the strongest electric field appears in the central portion of the circular cross section of the circular waveguide, and the direction of the electric field is a combination of the tube axis direction of the waveguide and the radial direction centering on the central portion.
Therefore, the direction in which the filamentous material is arranged is on an arbitrary line passing through the center in the cross section perpendicular to the tube axis direction or the tube axis.

On the other hand, in the first invention, the terminal of the waveguide (applicator terminal) is a terminal short-circuited by a dummy load terminal (non-reflective terminal) or a metal plate (referred to as a plunger).
When a terminal is formed using a dummy load, no standing wave is generated in the applicator, so that the number of filaments, the spacing between filaments, etc. can be freely extended.

Further, when the terminal is short-circuited with the plunger, it is in a reflective state and a large standing wave is generated.
The electric field at the peak of the standing wave is twice that when the dummy load is used, and appears at the position of (nλg / 2) + (λg / 4) starting from the position of the plunger. However, n represents 1, 2, 3,..., And λg represents a wavelength in the waveguide.
As a result, when the filamentous material is disposed at the peak portion of the standing wave, it becomes possible to stretch at twice the speed when using a dummy load.

In the first aspect of the invention, the microwave heating efficiency can be increased by providing the resonance iris so that the inside of the applicator is in a resonance state.
Specifically, since the Q value indicating the degree of resonance of the resonator including the applicator is set to be large, even if the frequency of the driving power source of the microwave oscillator fluctuates slightly, the microwave power is transferred to the resonator. To be able to propagate to
Furthermore, a plunger that can move one surface of the applicator so as to match the resonance frequency with the oscillation frequency of the microwave oscillator can be provided, and the stretching level can ensure a level equal to or higher than a predetermined level.

In the second invention, since a plurality of microwave stretching apparatuses are connected, high-speed stretching can be stably performed.
For example, the function can be divided such that preheating is performed in the first microwave stretching apparatus, stretching is performed in the second and third microwave stretching apparatuses, and aging is performed in the fourth microwave stretching apparatus. Therefore, since a thin thread can be produced from a thick thread at once, a microwave stretching apparatus with high stretching efficiency is obtained.

In the third aspect of the invention, the applicator is provided with an insulating pipe that forms a heating passage, so that the filamentous material can be guided to a portion where the electric field is strong in the waveguide. It can be secured.
The insulating pipe is made of a material that does not absorb microwave power.

  Further, according to the third aspect of the present invention, when the thread is passed through the applicator, that is, when the thread is passed through the insulating pipe, the thread is brought close to the insulating pipe and sent using high-pressure air. The filamentous material easily penetrates the applicator.

In this way, if the filamentous material penetrates through the insulating pipe, only the inside of the insulating pipe is exposed to the outside air, so that dust does not enter the waveguide and the cause of discharge and the like can be cut off.
Furthermore, if an appropriate amount of wind is allowed to flow through the insulating pipe during the stretching operation, the gas released from the filament can be quickly discharged out of the applicator, and the insulating pipe can be prevented from being soiled. it can.

  According to a fourth aspect of the invention, there is provided first power adjusting means for adjusting the power value of the microwave power by controlling an anode current of a magnetron included in the microwave oscillator, and a microwave variable attenuator provided in the waveguide. The power value of the microwave supplied to the stretching apparatus is controlled.

  In other words, since the magnetron becomes unstable when the output microwave power is greatly changed by reducing the anode current, the microwave power value is controlled by using the above-described microwave variable attenuator together. In consideration of energy saving, stable microwave power can be supplied.

1 is a simplified cross-sectional view of a rectangular waveguide stretching apparatus shown as a first embodiment. It is a simplified sectional view of a rectangular waveguide type stretching device shown as a second embodiment. It is a simplified sectional view of a rectangular waveguide type stretching device shown as a third embodiment. It is a figure which shows electric field distribution when it will be in a resonance state with the microwave power of TE103 mode. It is a conceptual diagram of a microwave power waveform diagram when the anode power source of the drive circuit for driving the magnetron is a single-phase half-wave rectification system It is a conceptual diagram of a microwave power waveform figure when the anode power supply with which said drive circuit is equipped is made into a single phase full wave rectification system. It is a conceptual diagram of a microwave power waveform when the anode power source provided in the drive circuit is a three-phase full-wave rectification method. It is explanatory drawing which showed the microwave irradiation energy when it was assumed that microwave power was an ideal direct current | flow state and it was set as the microwave power waveform of the single phase full wave rectification system. It is a perspective view which shows an example of the applicator of the extending | stretching apparatus shown in FIG. 1 shows the state of an electromagnetic field generated in the applicator of the stretching apparatus shown in FIG. 1, (A) is a cross-sectional view of the applicator in a direction orthogonal to the tube axis, (B) is a longitudinal cross-sectional view of the applicator, (C ) Is an explanatory view showing a cross-sectional view of the applicator. It is a simplified sectional view of a circular waveguide type stretching device shown as a 4th embodiment. It is a simplified sectional view of a circular waveguide type stretching apparatus shown as a fifth embodiment. FIG. 10 is a simplified cross-sectional view showing a stretching head portion of a rectangular waveguide stretching device shown as a sixth embodiment by connecting three stretching devices shown in FIG. 9. FIG. 10 is a simplified cross-sectional view showing a stretching head portion of a rectangular waveguide stretching apparatus shown as the seventh embodiment by connecting five stretching apparatuses as in FIG. 9. It is a simplified sectional view showing a rectangular waveguide type stretching apparatus of an eighth embodiment provided with a microwave variable attenuator for adjusting microwave power. It is a fragmentary sectional view showing an embodiment provided with an insulating pipe which penetrates a threadlike thing into an applicator with which a rectangular waveguide type drawing apparatus is provided. It is a fragmentary sectional view showing an embodiment provided with an insulating pipe which penetrates a filamentous object in an applicator with which a circular waveguide type drawing device is provided. It is a fragmentary sectional view which shows the circular waveguide type applicator with which the conventional extending | stretching apparatus is provided.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a simplified cross-sectional view of the rectangular waveguide type stretching apparatus shown as the first embodiment.
In this figure, reference numeral 21 denotes a microwave oscillator. The microwave oscillator 21 includes a magnetron 23 driven by a drive circuit 22 and outputs microwave power in a single transmission mode.
Then, the microwave power output from the microwave oscillator 21 is transmitted to the waveguide circuit including the applicator.
The drive circuit 22 includes an anode power source and a cathode power source and has a circuit configuration for driving the magnetron 23.

The waveguide circuit of the present embodiment is constituted by a high frequency coupler 24, a power monitor 25, an isolator 26, a connecting waveguide 27, an applicator main body 28, and a dummy load 29 as shown in the figure.
The isolator 26 includes a circulator 30 and a dummy load 31. A power monitor 32 is provided between the circulator 30 and the dummy load 31.

In the present embodiment, short cylindrical thread guides 28a and 28b are provided at the center of the H surface of the waveguide forming the applicator main body 28, and the filament 100 is guided by these thread guides 28a and 28b. The applicator main body 28 is penetrated.
In the stretching apparatus configured as described above, the microwave power output from the microwave oscillator 21 is coupled to the high frequency coupler 24, and the microwave power is transmitted from the high frequency coupler 24 toward the applicator main body 28, and the dummy power is transmitted. Absorbed by the load 29.
At this time, the central portion of the H surface of the waveguide has the maximum electric field.

Accordingly, since the filament 100 is guided by the yarn guides 28a and 28b and is located at the maximum electric field portion, the filament 100 is heated by microwaves from the inside of the filament 100. Therefore, by applying a tensile force to the filament 100, the filament 100 is efficiently made. It is well stretched at high speed.
Further, since the applicator body 28 is formed of a rectangular waveguide and the filament 100 is inserted so as to be parallel to the E surface, the distance of the filament 100 located in the applicator body 28 is short and heated. Thus, the stretching region to be stretched is shortened, and the problem that the stretching point is blurred can be solved.

  The applicator main body 28 described above is disposed between a take-up reel around which the filament 100 is wound and a take-up reel that takes up the stretched filament 100, and is fed from the take-up reel. The winding speed of the filamentous material 100 wound up by the take-up reel is increased with respect to the feed rate of the filamentous material 100, and a tensile force (of the filamentous material 100 of the filamentous material 100) is applied to the filamentous material 100 passing through the applicator main body 28. (Longitudinal pulling force).

In the case of the present embodiment, since the filamentous material 100 is thick and has a straight shape of about 5 mm, it is 4% or less of the wavelength of the microwave power propagating in the waveguide, and is reflected by the filamentous material 100. Microwave power can be ignored.
Therefore, even if a plurality of filaments are arranged in the central portion of the H surface of the applicator main body 28 in the tube axis direction of the waveguide, the same level of stretching is possible.

Further, the traveling wave power can be monitored by the power monitor 25, and the reflected wave power can be monitored by the power monitor 32.
If the indicated value of the microwave oscillator 21 is used for the traveling wave power, the reflected wave power from the applicator main body 28 can be ignored, so that the power monitors 25 and 32 can be omitted.
In the case of the present embodiment, the magnetron 23 is provided as a microwave oscillation device, but other devices can be used as long as they output microwave power.

FIG. 2 is a simplified cross-sectional view of the rectangular waveguide type stretching apparatus shown as the second embodiment.
In the second embodiment, in the stretching apparatus of the first embodiment shown in FIG. 1, a stub tuner 33 is provided instead of the connecting waveguide 27, and a movable plunger 34 is provided instead of the dummy load 29. The other features are the same.

In the stretching apparatus according to the present embodiment, the microwave power output from the microwave oscillator 21 is coupled to the high frequency coupler 24 and transmitted from the high frequency coupler 24 toward the applicator main body 28 side. Reflected by the conductor surface 34a.
At this time, the central portion of the H surface of the waveguide has the maximum electric field.
Further, by moving the movable portion 34a of the movable plunger 34, a voltage standing wave is generated in the applicator body 28 using the interaction between the traveling wave power and the reflected wave power, and the maximum of the voltage standing wave is increased. The position is aligned so that the filament 100 passes through.

Since the electric field strength at the maximum position of the voltage standing wave is twice as strong as that of the stretching apparatus in FIG. 1, the heating efficiency of the filamentous material 100 is increased. Wave power can be set small.
Note that the stub tuner 33 generates microwave power having a phase opposite to that of the microwave power reflected from the filament 100 in the applicator main body 28 to cancel the reflected wave power, so that 100% traveling wave power is applied to the applicator. It has a function of transmitting to the main body 28 side.
That is, the stub tuner 33 is adjusted so that the reflected wave power becomes zero by looking at the indicated value of the power monitor 32.

FIG. 3 is a simplified cross-sectional view of the rectangular waveguide type stretching apparatus shown as the third embodiment.
This third embodiment is characterized in that, in the stretching device of the second embodiment shown in FIG. 2, a resonance iris 35 is disposed between the stub tuner 33 and the applicator main body 28, and the others. It has the same configuration.

By arranging the resonance iris 35 as in the present embodiment, a resonance space 36 is formed in a space surrounded by the resonance iris 35, the applicator main body 28, and the movable portion 34a of the movable plunger 34, and this resonance. The space 36 is in a resonance state at the transmission frequency of the microwave oscillator 21 by adjusting the movement of the movable portion 34 a of the movable plunger 34.
Therefore, when the resonance space 36 is brought into the resonance state, the strength of the electric field becomes a large magnification depending on the degree of resonance, so that the microwave power necessary for setting the filament 100 to a temperature at which high-speed drawing can be performed is further reduced. Can do.

FIG. 4 shows the electric field distribution when the resonance space 36 is about 96 mm × 60 mm × 240 mm in a resonance state with TE103 mode microwave power.
By disposing the thread 100 in the dotted ellipse shown in this electric field distribution diagram, the thread 100 is effectively stretched.

Next, the relationship between the microwave power measured using the stretching apparatus shown in FIG. 3 and the stretching speed will be described.
FIG. 5 is a microwave power waveform diagram when the anode power source of the drive circuit 22 for driving the magnetron 23 is a single-phase half-wave rectification method, and FIG. 6 is a microwave waveform when the anode power source is a single-phase full-wave rectification method. FIG. 7 is a conceptual diagram showing a microwave power waveform diagram when the anode power source is a three-phase full-wave rectification system.

Among these microwave power waveforms, when the single-phase half-wave rectification type anode power source shown in FIG. 5 was adopted, the stretching time was long, and an appropriate result was not obtained for practical use of the stretching apparatus.
When the single-phase full-wave rectification type anode power source shown in FIG. 6 was employed, stretching was possible with the stretching time of a conventional stretching apparatus using a heating furnace, but stable stretching was not possible.
If a smoothing circuit is added to the single-phase full-wave rectification type anode power supply, the minimum value of the instantaneous value of the microwave power waveform is not zero, so stable stretching is possible. Therefore, considering the oil reliability, it is preferable to use a three-layer full-wave rectification type anode power source shown in FIG.

On the other hand, in the microwave power of the waveform diagrams shown in FIGS. 5 and 6, the maximum microwave change amount and the peak value of the microwave power are the same, but the repetition period is 20 ms (50 Hz). ), The microwave power of FIG. 6 is 10 ms (in the case of 50 Hz).
On the other hand, in the microwave power of the three-phase full-wave rectification in FIG. 7, the maximum change amount of the microwave is only 13.4% of the peak value of the microwave power, and the repetition period is shortened to 3.33 ms.
It was found that such a difference in microwave power greatly affects the stretchability.

  Although illustration is omitted, when a three-phase half-wave rectification type anode power supply is adopted, the microwave power waveform is the same as in FIG. 7, but the maximum microwave variation is 50% of the peak value of the microwave power, and is repeated. The period is 6.67 ms.

Here, the distortion rate is defined by the maximum change amount (%) of the microwave with respect to the peak value of the microwave power.
Distortion rate = (microwave power change amount / peak microwave power value) x 100 (%)

Now, assuming that the microwave power is in an ideal direct current state and the microwave power waveform is the microwave power waveform of the single-phase full-wave rectification system shown in FIG. 6, the microwave power shown in FIG. The hatched area is the microwave irradiation energy Eon.
Then, the difference from the ideal DC state, that is, the shortage energy with respect to the ideal state becomes Eshort.

Table 1 below shows the results of studying three anode power sources of a single-phase full-wave rectification method, a three-phase half-wave rectification method, and a three-phase full-wave rectification method according to this definition.
Here, the energy fluctuation rate δ is
δ = {Eshort / (Eon + Eshort)} × 100 (%)
Defined.
Table 1 below shows the results of analysis under the same microwave irradiation energy in the three types of anode power supply systems.

On the other hand, when microwave power in a single transmission mode is introduced into an applicator body having a waveguide structure, for example, as shown in FIG. The filamentous material 100 is fed so as to cross the tube axis of the waveguide.
Therefore, as shown in FIG. 10, the filament 100 passes through the portion having the strongest electric field in the waveguide.
In the case of the waveguide WRJ-2, the distance L on which the microwave power acts is L = 54, 6 mm, and the inner surface distance D of the H plane is 109.2 mm.

  9 is a perspective view showing the applicator main body 28 shown in FIG. 3, FIG. 10 shows the generation state of the electromagnetic field in the applicator main body 28, and FIG. 7A shows a cross section orthogonal to the tube axis. 7B shows a longitudinal section in the tube axis direction, and FIG. 7C shows a transverse section in the tube axis direction.

  Table 2 below shows the results of stretching measurement using the above-described rectangular waveguide stretching apparatus of FIG. 3 equipped with a single-phase full-wave rectification type anode power source.

As can be seen from Table 2, no. Under the condition 1, that is, when the feeding speed of the filament 100 is 10 m / min, stretching can be performed, but the stretching time becomes long.
No. When the feed rate of the filament 100 was 15 m / min, the drawing could not be performed.
From this, the limit that high-speed stretching is inappropriate is No. 2 in Table 2. Since the condition of 1 can be estimated, the limit of stretching can be known as follows.

1. Single-phase full-wave rectification No. 1 in Table 1 above. 1, energy fluctuation cycle- = 10 ms, energy fluctuation is 100% -42.9% = 57.1%. 1 indicates that the wave number of 32.7 has a long stretching time, the limit is NG, and the wave number of 21.8 cannot be stretched and is NG.

2.3 Three-phase half-wave rectification No. 1 in Table 1 above. 2, the energy fluctuation cycle was 6.67 ms, the energy fluctuation was 100% -79.1% = 20.9%, and the energy fluctuation rate of single-phase full-wave rectification was 57.1%, Since the energy fluctuation rate of the three-phase half-wave rectification is 20.9%, assuming that (57.1 / 20.9) = 2.73 as the relaxation index, the following Table 3 is obtained.

3.3 Three-phase full-wave rectification No. 1 in Table 1 above. 3, energy fluctuation cycle- = 3.33 ms, energy fluctuation was 100% -95.3% = 4.7%, and the energy fluctuation rate of single-phase full-wave rectification was 57.1%, Since the energy fluctuation rate of the three-phase full-wave rectification is 4.7%, assuming that (57.1 / 4.7) = 12.1 as a relaxation index, the following Table 4 is obtained.

From the above measurement results, when a single-phase full-wave rectifying power source is provided as the anode power source of the drive circuit 22, if the filament 100 passes through the applicator 28 at a speed shorter than 10 m / min, it cannot be stretched. It becomes an unsuitable stretching device.
If a three-phase full-wave rectifier power source is provided as an anode power source for the drive circuit 22, even if the filament 100 passes through the applicator 28 at a speed shorter than 50 m / min, it can be stretched and is suitable for high-speed stretching. It was confirmed to be a device.

FIG. 11 is a simplified cross-sectional view of the circular waveguide stretcher shown as the fourth embodiment.
In the present embodiment, the high-frequency coupler 24, the power monitor 25, the isolator 26, the stub tuner 33, the coaxial waveguide conversion unit 37, the coaxial tube 38, the extending applicator main body 39, and the movable plunger 40 are used for the waveguide circuit. The other features are the same as the stretching apparatus of the embodiment of FIG.

  In the case of this embodiment, the applicator main body 39 and the movable plunger 40 have a cylindrical waveguide structure, and the isolator 26 is formed by a circulator 30 and a dummy load 31 as in the above-described embodiment. In addition, a power monitor 32 is provided between the circulator 30 and the dummy load 31 to monitor the reflected wave power.

On the other hand, the coaxial waveguide converter 37 is provided with a matching metal block 37a for efficiently transmitting the microwave power to the coaxial tube 38, and the outer conductor 38a of the coaxial tube 38 is provided. The coaxial waveguide conversion portion 37 and the applicator main body 39 are connected and fixed by the above.
The inner conductor 38b of the coaxial tube 38 is fixed to the thread guide 37b through the block 37a on one end side, and protrudes into the applicator main body 39 on the other end side, and its protruding length 38c. Is a quarter wavelength.

The movable shaft 40b that supports the movable portion 40a of the movable plunger 40 is hollow and has a function of a yarn guide.
That is, the thread-like object 100 is supported by the thread guide 37b and the movable shaft 40b and passes through the applicator main body 39.
In the case of the present embodiment, the space surrounded by the applicator main body 39 and the movable portion 40 a of the movable plunger 40 is a resonance space 41.

  Since the stretching device of this embodiment can create a TM01n mode resonance state in the resonance space 41 by moving and adjusting the movable portion 40a of the movable plunger 40, the center of the cylindrical body forming the applicator main body 39 can be formed. Since the electric field is concentrated along the axis, the thread 100 is inserted along the central axis of the applicator main body 39 so that the thread 100 is stretched at high speed while being heated while being heated.

FIG. 12 is a simplified cross-sectional view of the circular waveguide type stretching apparatus shown as the fifth embodiment.
In the present embodiment, a coupling waveguide 42 is provided instead of the coaxial waveguide converter 37 of the fourth embodiment shown in FIG. 11, and the coupling waveguide 42 is connected to the applicator main body 39 via this coupling waveguide 42. The other features are the same as those of the fourth embodiment shown in FIG.

The coupling waveguide 42 is a rectangular waveguide and is connected so that its E surface is parallel to the tube axis of the cylindrical applicator main body 39.
A coupling hole 39a having a smaller diameter than the inner diameter of the coupling waveguide 42 is formed on the side surface of the applicator main body 39 to which the coupling waveguide 42 is coupled, and microwave power is passed through the coupling hole 39a. Propagate into the body 39.

On the other hand, the yarn guide 39b provided on the end surface of the applicator main body 39 is provided with a protrusion portion 39c having a length λ / 4 protruding into the applicator main body 39, and the protrusion 39c and the coupling waveguide 42 are opposed to each other. The positional relationship is as follows.
By arranging and configuring in this way, the microwave electric field concentrates on the tip of the protruding portion 39c, so that the TM01 mode is generated in the applicator main body 39.

Accordingly, by adjusting the movement of the movable portion 40a of the movable plunger 40, the resonance space 41 is in the TM01n mode resonance state, and therefore, the microwave electric field concentrates along the central axis of the cylindrical body that is the applicator main body 39.
From this, if the thread-like object 100 is inserted along the central axis of the applicator main body 39, the thread-like object 100 can be stretched at high speed.

FIG. 13 is a simplified cross-sectional view showing a stretching apparatus of a sixth embodiment configured by connecting a plurality of square wave waveguide stretching apparatuses.
In this drawing, a stretching head portion of a stretching apparatus in which three stretching apparatuses 45, 46, 47 are connected is shown.

That is, the heating passages of the applicators 45a, 46a, and 47a of the stretching devices 45, 46, and 47 are connected, and the filament 100 is inserted into the connected heating passages.
3 are connected to the same components as the microwave oscillator 21, the high-frequency coupler 24, the power monitor 25, and the isolator 26 shown in FIG. And microwave power P is propagated from the direction of the arrow.

FIG. 14 is a simplified cross-sectional view of a stretching apparatus showing a seventh embodiment configured by connecting a plurality of rectangular waveguide type stretching apparatuses as in FIG.
This drawing shows an example in which the stretching head portions of five stretching devices 48, 49, 50, 51, 52 are connected.

Compared with the embodiment of FIG. 13, this embodiment connects the stretching devices 48, 49, 50, 51, 52 every other position rotated 180 degrees, and the applicators 48 a, 49 a, 50 a, 51 a, The difference is that the connecting waveguides 48c, 49c, 50c, 51c, and 52c are arranged between the 52a and the stub tuners 48b, 49b, 50b, 51b, and 52b, but the other configurations are the same.
However, in this embodiment, there exists an advantage which can make the height of the connection rings 53-58 low.

In addition, it can also be set as the structure which connects each extending | stretching apparatus 48, 49, 50, 51, 52 in the position rotated 90 degree | times sequentially, If it comprises in this way, applicator 48a, 49a, 50a, 51a, Since the collision of the flange 52a can be avoided, the connection rings 53 to 58 can be omitted.
Moreover, although the above-described sixth and seventh embodiments connect a plurality of stretching apparatuses shown in FIG. 3, a configuration in which a plurality of stretching apparatuses shown in FIGS. 1, 2, 11, and 12 are connected, and You can also

  As described above, the stretching apparatus in which a plurality of stretching apparatuses are connected as described above, for example, preheating with the first microwave stretching apparatus, stretching with the next microwave stretching apparatus, and subsequent microwave stretching. Since the function can be divided as if aging is performed by the apparatus, a thin thread-like material can be produced from a thick thread-like material at a stretch, and a microwave stretching apparatus with high stretching efficiency can be obtained.

FIG. 15 is a simplified cross-sectional view of the stretching apparatus shown as the eighth embodiment.
In this embodiment, in addition to adjusting the power value of the microwave power by controlling the anode current of the magnetron 23 using the anode power source of the drive circuit 22, a microwave variable attenuator is provided to finely adjust the microwave power. It is the extending | stretching apparatus provided with the electric power adjustment apparatus to do.

FIG. 15 shows an example in which the drawing apparatus of FIG.
3 includes a microwave variable attenuator 60 formed by connecting an isolator 61 and a variable reactance element (variable susceptance element) 62 between the high frequency coupler 24 and the power monitor 25 in the stretching apparatus shown in FIG. A power conditioner is provided.

  The isolator 61 is formed of a circulator 63 and a dummy load 64, and the variable reactance element 62 is composed of an EH tuner. The variable reactance element 62 may be an E tuner, an H tuner, or a stub. It can also be configured as a tuner.

The stretching apparatus configured as described above adjusts the power by reflecting a part of the microwave power oscillated from the microwave oscillator 21 according to the adjustment of the variable reactance element 62.
The reflected power reflected by the variable reactance element 62 is bent toward the dummy load 64 by the circulator 63 and absorbed by the dummy load 64.
Therefore, the transmitted power that has passed through the isolator 61 is displayed by the power monitor 25, and this transmitted power is propagated to the subsequent waveguide circuit section, and the filament 100 as described above is stretched.

As a result, according to the stretching apparatus of the present embodiment, the drive circuit 22 changes the anode current of the magnetron 23 to roughly adjust the power value of the microwave power, and then the variable reactance element 62 is used to change the microwave power. The power can be adjusted by a method such as fine adjustment.
In addition, the electric power adjustment apparatus provided in this way can be similarly provided not only about the extending | stretching apparatus of FIG. 3, but each extending | stretching apparatus of above-described embodiment similarly.

FIG. 16 is a partial cross-sectional view showing an embodiment in which an insulating pipe is provided in the heating passage of the applicator main body 28 provided in the above-described rectangular waveguide type stretching apparatus.
As shown in the figure, an insulating pipe 70 is provided so as to penetrate the upper and lower H surfaces of the waveguide forming the applicator 28, and the filament 100 is inserted through the insulating pipe 70.

In the present embodiment, the upper and lower thread guides 28a and 28b are fixed, but the thread guides 28a and 28b are insulated so that the microwave power does not leak even if the height is reduced as much as possible. A microwave absorber 71 is provided between the pipe 70.
The yarn guide may be formed in a funnel shape to facilitate the insertion of the filament 100, and the height can be reduced even if a choke structure is incorporated instead of the microwave absorber 71. it can.

FIG. 17 is a partial cross-sectional view showing an embodiment in which an insulating pipe is provided in the heating passage of the applicator main body 39 provided in the circular waveguide type stretching apparatus shown in FIG.
In the present embodiment, the insulating pipe 72 fixed to the thread guide 39b is slidably supported by the movable shaft 40b of the movable plunger 40, and the thread 100 is inserted into the insulating pipe 72.

  According to the drawing apparatus provided with the insulating pipe as described above, when the thread 100 is penetrated into the insulating pipe 70 or 72, the thread 100 is sent by using the high-pressure air with the insulating pipe 70 or 71 approached. The filamentous material 100 easily penetrates into the applicator.

In addition, as described above, if the filamentous material 100 penetrates the insulating pipe 70 or 71, only the inside of the insulating pipe is exposed to the outside air, so that dust does not enter the waveguide, and discharge or the like. The cause can be cut off.
Furthermore, if an appropriate amount of wind is allowed to flow through the insulating pipe 70 or 71 during the stretching operation, the gas released from the filament 100 can be quickly discharged out of the applicator. It is possible to prevent dirt from being removed.

  In the process of producing a filamentous material of an organic synthetic material, the filamentous material is heated using a microwave heating means while being pulled, and applied to a stretching apparatus that stretches the filamentous material.

21 Microwave Oscillator 22 Drive Circuit 23 Magnetron 25 Power Monitor 26 Isolator 28 Applicator Main Body 29 Dummy Load 30 Circulator 31 Dummy Load 32 Power Monitor 33 Stub Tuner 34 Movable Plunger 35 Resonance Iris 37 Coaxial Waveguide Converter 38 Coaxial Tube 39 Applicator body 40 Movable plunger 42 Coupling waveguide 45-52 Stretching device 60 Microwave variable attenuator 61 Isolator 62 Variable reactance 70, 72 Insulating pipe 100 Filament

Claims (4)

In a stretching device that pulls a filamentous material made of an organic synthetic material while heating it and stretches the filamentous material,
A part of a waveguide for transmitting microwave power from a microwave oscillator is formed as an applicator, and the applicator is formed with a heating passage through which the filamentous material is inserted,
Further, the microwave stretching apparatus is characterized in that a microwave electric field in a single transmission mode is transmitted to the waveguide so that a microwave electric field is concentrated in a heating passage of the applicator. In the microwave extending | stretching apparatus described in Claim 1,
A plurality of microwave stretching devices are connected so as to communicate with the heating passage, and the power value of the microwave power transmitted to the waveguide of each microwave stretching device is controlled. Microwave stretching device. In the microwave extending | stretching apparatus described in Claim 1,
A microwave stretching apparatus, wherein an insulating pipe that forms the heating passage is disposed in the applicator. In the microwave extending | stretching apparatus described in Claim 1,
First power adjusting means for adjusting a power value of microwave power by controlling an anode current of a magnetron included in the microwave oscillator;
A second power adjusting means including a microwave variable attenuator that is provided in the waveguide and controls a variable reactance element to adjust a power value of the microwave power;
A microwave stretching apparatus characterized in that the power value of the microwave power is adjusted by using the first and second power adjusting means together.

Images