JP2004124297A - Filament yarn baking apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filament yarn baking apparatus for producing flameproof fiber or carbon fiber or the like provided with openings for passing therethrough filament yarns traveling in parallel, so designed that in carrying out a baking treatment of the filament yarns, sealability at the openings necessary for attaining high-quality and high-grade processing effect, energy saving, gas saving, low cost and productivity improvement is drastically improved, and operability is significantly improved so as to deal with even in case trouble occurs in operation such as fluff cloggings/yarn breakage at the openings. <P>SOLUTION: The filament yarn baking apparatus for making a baking treatment of filament yarns passing therethrough includes a sealing device functioning to feed the openings of a treatment device through which the filament yarns are passed with a sealing gas under pressure control, wherein the sealing device is designed to be openable/closable. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a yarn baking apparatus for producing flame-resistant fibers or carbon fibers by baking a passing multifilament.
[0002]
[Prior art]
Usually, the flame-resistant fiber is a polyacrylonitrile fiber, a regenerated cellulose fiber, a phenol fiber, a precursor fiber made of an organic polymer such as a pitch-based fiber is arranged in a multifilament in a firing device in parallel, run between rollers, In the meantime, it is manufactured by firing at a temperature of 200 to 300 ° C. in an air or oxidizing gas atmosphere.
[0003]
Further, the flame resistant fiber is fired at a temperature of 800 to 2000 ° C. in an atmosphere of an inert gas such as nitrogen or argon to produce a carbon fiber, and further fired at 1500 to 3000 ° C. to graphitize. As a result, a graphite fiber having a higher elastic modulus is produced.
[0004]
Also in these carbonization and graphitization production processes, in order to increase the production efficiency, the yarns are often run in a baking device side by side in a multi-filament, and a predetermined treatment is often performed between them. A resistance is provided at the opening of the baking apparatus provided for introducing and leading the strip into and out of the baking apparatus, so that the inflow of air into the apparatus or the outflow of medium gas from the apparatus is minimized. In general, by properly sealing, the processing pressure is properly maintained, the temperature inside the apparatus is adjusted and uniformized, and a high-quality processed object that is appropriately processed is usually obtained. Needless to say, such a seal at the opening is directly linked to energy saving, gas saving, and cost reduction in addition to the above-mentioned quality, and in fact, has a great significance in industry.
[0005]
Hitherto, a labyrinth seal mechanism and a honeycomb seal mechanism have been widely known as a gas seal for non-contacting an object to be processed such as a thread at an opening of this type of firing apparatus.
[0006]
The labyrinth seal mechanism is generally composed of a partition plate arranged at right angles to a direction in which gas flows (a direction generally equal to the normal direction of the workpiece), and a groove space partitioned by the partition plate. The pressure loss generated for each partition plate acts as a resistance to the gas flow, and reduces the amount of outflow and inflow gas. In such a labyrinth seal, the groove space is continuously disposed in a direction perpendicular to the passage direction of the workpiece, and a part of the outflow and inflow gas flows along the groove space and And at right angles to the advancing direction, which disturbs the object to be processed, particularly the yarn as the object of the present invention, gives flutter to the object to be processed and contacts the partition plate to cause damage. That is, it has a disadvantage of inferior quality, or, on the other hand, in order to avoid such a disadvantage, it is necessary to increase the distance between the labyrinth seal partition plate and the object to be processed. There were drawbacks, which led to a reduced sealing effect. From this point, the labyrinth seal can be widened and multi-staged.However, in general, the labyrinth seal device itself, in forming the partition plate and the groove, requires a high production cost and is heavy, so that the workpiece is heavy. It has drawbacks such as poor operability when passing through and occurrence of trouble, or large scale on the equipment, and has such a limitation, and also a limitation on the space of the entire processing apparatus and a continuous process. Partly, widening and multi-stage are often limited, and the problem of not being able to achieve a sufficient seal to achieve the important purpose of efficiently obtaining high-quality processed materials cannot be solved. It was something that existed.
[0007]
On the other hand, a honeycomb sealing mechanism is a cell material formed by continuously providing a large number of cells in which a space is two-dimensionally partitioned by a partition plate using a honeycomb material made of aluminum, asbestos, polyvinyl chloride, ceramics, or the like. And a panel for closing one side of the cell material. By opposing the open surfaces, a resistance is provided to minimize the inflow of air into the apparatus or the outflow of medium gas from the apparatus. (See, for example, Patent Document 1). In such a honeycomb seal, since cells exist in the vicinity of the traveling yarn, fuzz accumulates in the honeycomb portion during normal use and when trouble such as yarn breakage occurs, causing fuzz clogging or yarn breakage, or a sealing device for the treatment. When the device is removed, the pressure inside the processing device rapidly decreases, and outside air flows into the processing device, causing problems such as deterioration of quality and troubles such as thread breakage.
[0008]
[Patent Document 1]
Japanese Patent Application Laid-open No. Sho 62-243831 In particular, if the invention is limited to an apparatus for producing carbon fibers and the like according to the present invention, as a first example of a carbonization firing apparatus, a slit heated to a temperature of 200 to 400 ° C is used. The main purpose is to heat the thermal decomposition product generated from the yarn because it is cooled, condensed, and easily adheres as tar (for example, see Patent Document 2). Further, as a second example, since the surface is contact-sealed with a corrugated graphite scraping plate, generation of fluff on the yarn cannot be avoided, and it is hardly practical (see Patent Document 3, for example). A third example is an example in which a porous sintered body is used for a seal gas ejection nozzle portion. Although the inflow of outside air can be prevented, there is a disadvantage that the seal gas flows out of the apparatus (for example, And Patent Document 4). The fourth example is an example in which a processing chamber has a seal chamber under an inert gas atmosphere to prevent the decomposition gas in the furnace and the tar substance from adhering to the yarn due to leakage of the gas in the furnace. Since the pressure in the seal chamber is set higher than the inside, in addition to requiring a large amount of inert gas, a large amount of inert gas pressure damages the yarn, causing thread breakage and fuzz clogging, as well as sealing. Since the chamber is fixed, it is difficult to open it, and when a trouble such as thread breakage or fuzz clogging occurs, the seal room gets in the way, and the inside of the processing unit cannot be checked enough, and troubles such as trouble handling are difficult. Had also. If the seal chamber is suddenly opened forcibly to deal with a trouble, the pressure balance in the processing apparatus is lost, and there is a great risk of causing a quality abnormality or a yarn breakage trouble due to introduction of a large amount of outside air (for example, Patent Document 5).
[0009]
[Patent Document 2]
Japanese Patent Publication No. 52-24137
[Patent Document 3]
JP-A-57-117624
[Patent Document 4]
Japanese Utility Model Publication No. 60-8640
[Patent Document 5]
JP-A-7-118933
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned conventional problems, and in particular, when firing a yarn in a firing device provided with an opening for passage of multiple yarns running in parallel. , High quality, high quality processing results, energy saving, gas saving, low cost, and greatly improved sealing performance at the opening required to improve productivity, and fuzz clogging and thread breakage at the opening Accordingly, it is an object of the present invention to provide a yarn baking apparatus for producing flame-resistant fibers or carbon fibers, etc., whose operability has been remarkably improved so that even when an operation trouble such as an operation trouble occurs, the operability is remarkably improved.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following configuration. That is,
(1) An apparatus for baking a passing multifilament, comprising a sealing device for supplying a sealing gas to an opening of a processing device through which the yarn passes to control a pressure, and the sealing device A yarn baking device characterized in that the yarn can be opened and closed.
[0015]
(2) The yarn baking device according to (1), wherein the condition in the processing device is adjusted so as to satisfy the following expression (1) when the sealing performance is reduced due to the opening of the sealing device.
[0016]
P0> 0 (1)
P0: pressure in processing equipment (mmH ₂ O)
(3) The yarn according to (1), wherein the amount of inert gas introduced into the processing device is increased so as to satisfy the above expression (1) when the sealing performance decreases due to the opening of the sealing device. Baking equipment.
[0017]
(4) The method according to (1) or (2), wherein the supply amount of the sealing gas to the sealing device is adjusted so that the pressure P in the sealing device satisfies the following expression (2). A yarn baking device according to the above.
[0018]
0 <P <P0  … (2)
P: Pressure inside the sealing device (mmH ₂ O)
P0: Pressure in the processing apparatus (5) The supply amount of the sealing gas to the sealing apparatus is adjusted so that the pressure P in the sealing apparatus and the pressure P0 in the processing apparatus satisfy the following expression (3). The yarn baking device according to (1) or (2), which is characterized in that:
[0019]
1 ≦ P0−P ≦ 10  … (3)
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
The firing device in the present invention includes a firing furnace, a preheating furnace, and the like for producing flame-resistant fibers, infusible fibers, carbon fibers, graphite fibers, and the like.
[0021]
Hereinafter, an example in which a baking apparatus provided with the sealing device according to the present invention is implemented in a carbonization apparatus will be described in more detail with reference to the drawings and the like.
[0022]
1 and 2 illustrate a preferred embodiment of the details of the sealing device portion of the present invention. FIG. 1 is a schematic longitudinal sectional view of the vicinity of the outside, and FIG. 2 is a view taken along the line ZZ in FIG. It is a schematic sectional drawing.
[0023]
FIG. 3 is a vertical cross-sectional schematic view of a vertical carbonization device provided with the sealing device of the present invention. After being introduced into the carbonization device main body 2 through the portion 2b and fired, it is drawn out from the upper opening 2a. As for the gas in the apparatus, an inert gas such as nitrogen is supplied from a supply port 4 and exhausted from an exhaust port 5 for strengthening a seal such as prevention of suction of outside air. It is important to maintain the pressure above atmospheric pressure.
[0024]
1 and 2, the yarn 1 is drawn out of the carbonizing device 2 from the upper opening 2a through the sealing plug 6 after the carbonizing treatment. The opening 2a is provided with a non-contact type sealing device 7 capable of controlling the pressure to be constant in order to reduce the pressure difference between the inside and the outside of the processing apparatus and enhance the sealing effect. The seal box 7 has a box shape surrounding the opening 2a and the seal plug 6, and a seal gas can be introduced from the ends 8 at both ends.
[0025]
The sealing device of the present invention has an openable and closable structure. Specifically, for example, when troubles such as fuzz clogging or thread breakage occur in the processing apparatus and in the processing apparatus opening while the sealing apparatus is in use, and it is necessary to take measures, the connection section 11 on the side wall of the sealing apparatus is used. With the fulcrum as a fulcrum, the seal device can be easily divided into two and opened. By this opening, a fluff clogging or a thread breakage can be instantaneously confirmed, and the treatment can be performed quickly and easily, and operability and productivity can be improved. The fulcrum 11 and the method of opening the sealing device may be of any mechanism as long as the sealing device can be easily opened.
[0026]
In particular, if the sealing device enhances the sealing effect and reduces the amount of inert gas such as nitrogen supplied to the processing device due to energy saving, etc. The pressure balance changes rapidly, and a large amount of outside air is introduced into the processing apparatus, which causes abnormal quality and troubles such as thread breakage.
[0027]
Therefore, in the baking apparatus equipped with the sealing device of the present invention, it is important to adjust the pressure in the processing device in order to prevent the introduction of outside air at the same time as the opening of the sealing device. , A seal device opening detection device 12 is provided. Specifically, the seal device opening detection device is, for example, a device in which a limit switch is provided in the vicinity of the seal device, and the limit works simultaneously with the opening of the seal device. The signal output from the seal device opening detection device 12 is sent to an inert gas supply unit such as nitrogen, and simultaneously with the opening of the seal device, the inert gas supply valve 14 for nitrogen or the like is adjusted. Is satisfied, and the supply gas to the inside of the processing apparatus can be increased simultaneously with the opening of the sealing apparatus so that the outside air is not introduced into the processing apparatus. In order to prevent the introduction of outside air, it is possible to reduce the amount of exhaust air from the exhaust port 5. However, in this case, even if the reaction occurs simultaneously with the detection of the opening of the sealing device, it may take time to stabilize the conditions. The former is more preferable.
[0028]
P0> 0 (1)
P0: pressure in processing equipment (mmH ₂ O)
The sealing gas introduced into the sealing device of the present invention is not particularly limited, but air is preferable from the viewpoint of energy saving. Further, the pressure P in the sealing device is constantly measured by the pressure gauge 9, and the amount of the sealing gas introduced is automatically adjusted by the sealing gas supply valve 15 so as to maintain the set pressure. The pressure P in the sealing device exerts the sealing effect to the maximum and the pressure P0 in the processing device constantly measured by the pressure gauge 13 in order to prevent the introduction of outside air into the processing device. It is preferable to set the pressure as small as possible and higher than the atmospheric pressure.
[0029]
0 <P <P0  … (2)
P: Pressure in seal box (mmH ₂ O)
P0: pressure in processing equipment (mmH ₂ O)
There is no problem if the pressure P in the sealing device is basically larger than the pressure P0 in the processing device. However, if P0-P is less than 1, the possibility of external air being introduced into the processing device instantaneously due to pressure fluctuation. When P0-P exceeds 10, the amount of leakage from the processing apparatus increases, and satisfactory sealing may not be achieved. Therefore, it is more preferable that the following expression (3) is satisfied in order to exhibit the sealing effect and not be affected by the pressure fluctuation in the sealing device and the pressure fluctuation in the processing device due to the fluctuation of the introduced sealing gas.
[0030]
1 ≦ P0−P ≦ 10  … (3)
In addition, the gap ε ′ of the sealing device slit portion 10 from which the yarn is led out from the sealing device is as narrow as possible without contacting the yarn, and is preferably equal to or less than the slit gap ε of the processing device (ε ′ ≦ ε).
[0031]
Above, by adopting the sealing method by the sealing device applied to the present invention, it is possible not only to improve the sealing property and to stably obtain a high-quality and high-grade flame-resistant fiber or carbon fiber, Significant energy savings can reduce manufacturing costs, and enable safe and prompt responses even when troubles such as thread breakage or clogging of fluff occur.
[0032]
【The invention's effect】
The present invention provides a method for manufacturing a flame-resistant fiber or carbon fiber by baking a multifilament passing therethrough. Since it can be opened, troubles such as fuzz clogging and yarn breakage can be promptly dealt with, and operability is excellent. In addition, since it is not in contact with carbon fibers, fluff does not occur. Further, the sealing device not only can obtain high sealing properties and can obtain high-quality carbon fibers, but also can significantly reduce manufacturing costs by reducing the use of nitrogen and the like to be used.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing the vicinity of the outside of a sealing device according to an embodiment of the present invention.
FIG. 2 is a schematic sectional view taken along the arrow ZZ in FIG.
FIG. 3 is a schematic longitudinal sectional view of a vertical carbonizing apparatus to which the apparatus of the present invention can be preferably applied.
[Explanation of symbols]
1: yarn 2: firing device main body 2a, 2b: firing device opening 3: supply roller 4: inert gas supply port 5: inert gas exhaust port 6: seal plug 7: sealing device 8: seal gas supply port 9 : Pressure gauge A
10: Sealing device slit 11: Sealing device opening fulcrum 12: Sealing device opening detecting device 13: Pressure gauge B
14: Inert gas supply valve 15: Seal gas supply valve

Claims (5)

A device for baking a passing multifilament, comprising a sealing device for supplying a sealing gas and controlling a pressure at an opening of a processing device through which the multifilament passes, and the sealing device can be opened and closed. An apparatus for firing a yarn, characterized in that: 2. The yarn firing apparatus according to claim 1, wherein when the sealing performance decreases due to the opening of the sealing apparatus, the conditions in the processing apparatus are adjusted so as to satisfy the following expression (1).
P0> 0  … (1)
P0: pressure in processing equipment (mmH ₂ O) 2. The yarn firing apparatus according to claim 1, wherein when the sealing performance decreases due to the opening of the sealing apparatus, the amount of the inert gas introduced into the processing apparatus is increased so as to satisfy the expression (1). 3. 3. The firing of the yarn according to claim 1, wherein the supply amount of the sealing gas to the sealing device is adjusted so that the pressure P in the sealing device satisfies the following expression (2). apparatus.
0 <P <P0  … (2)
P: Pressure inside the sealing device (mmH ₂ O)
P0: pressure inside the processing unit 3. The method according to claim 1, wherein the supply amount of the sealing gas to the sealing device is adjusted so that the pressure P in the sealing device and the pressure P0 in the processing device satisfy the following expression (3). A yarn baking device according to the above.
1 ≦ P0−P ≦ 10  … (3)

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