JP4838700B2 - Heat treatment apparatus and heat treatment method - Google Patents

Description

  The present invention relates to a heat treatment apparatus and a heat treatment method.

2. Description of the Related Art Conventionally, a heat treatment apparatus for continuously heat-treating an object to be processed in manufacturing a long object such as a film, a sheet, a fiber (hereinafter referred to as an object to be processed) is known. In this heat treatment apparatus, for example, in the case of carbon fiber, a precursor fiber made of, for example, polyacrylonitrile fiber is continuously heat treated in a heat treatment chamber. At this time, decomposition gases such as cyanide, ammonia, and carbon monoxide are generated in the heat treatment chamber by the oxidation reaction of the precursor fibers. This cracked gas needs to be recovered and subjected to gas treatment such as combustion treatment.
In order to prevent such decomposition gas from leaking out of the precursor fiber insertion port of the heat treatment apparatus to the outside of the heat treatment apparatus, a seal chamber is provided adjacent to the heat treatment chamber, and the precursor fiber insertion port of the seal chamber is further provided. There has been proposed a heat treatment apparatus provided with an air curtain means for blowing air outside the heat treatment apparatus toward an object to be processed outside (see, for example, Patent Document 1).
In addition, in order to suppress temperature unevenness in the heat treatment apparatus, a heat treatment apparatus having a mechanism in which a slit is provided at an insertion port of the heat treatment apparatus and heated air is ejected from the slit into the heat treatment apparatus or outside the heat treatment apparatus has been proposed (for example, , See Patent Document 2).
JP 2004-143647 A WO02 / 077337 pamphlet

  However, in the conventional heat treatment apparatus, in order to suppress the flow rate of the outside air flowing into the seal chamber, when the ejection speed of the air sprayed toward the object to be processed is increased, for example, a slit-like nozzle that ejects air is used. The air flow of the outside air flowing from the precursor fiber insertion port into the seal chamber is disturbed due to the pin arranged to maintain the interval and the dimensional error of the nozzle interval due to welding, etc., and from the seal chamber to the insertion port There is a problem in that an airflow in the direction toward the head is generated, and the gas in the seal chamber leaks out of the seal chamber from the insertion port.

  Therefore, the present invention provides a heat treatment apparatus that can prevent the gas in the seal chamber from leaking to the outside even when the ejection speed of the air blown toward the object to be treated is increased.

In order to solve the above-described problems, the present invention provides a heat treatment apparatus for continuously heat-treating an object to be processed in a heat-treatment chamber, for inserting the object to be processed into an outer wall of a seal chamber provided continuously to the heat-treatment chamber. A slit-shaped insertion port is provided, and a pair of pressure chambers are provided on the outer wall of the seal chamber with the insertion port interposed therebetween, and air is provided in the pressurization chamber outside the seal chamber and toward the object to be processed. A pair of nozzles for jetting is provided, and a cylindrical rectifying member is provided in the seal chamber so as to be continuous with the insertion port.
By comprising in this way, a gas flow path can be formed between the pressurization chambers outside the seal chamber. Further, the gas passing through the insertion port of the seal chamber also passes through the inside of the rectifying member provided continuously to the insertion port. Thereby, the outside air flowing into the seal chamber from the insertion port passes through the flow passage formed between the pressurizing chambers, and further passes through the insertion port and flows inside the rectifying member. At this time, the flow of the outside air flowing into the seal chamber from the insertion port is uniformly rectified by the pressure loss when passing through the flow path formed between the pressurizing chambers and the inside of the rectifying member, and the insertion port is opened from the seal chamber. It is possible to prevent the flow of gas in the direction passing through and toward the outside of the heat treatment apparatus.

Moreover, you may provide the said baffle member so that attachment or detachment is possible.
By comprising in this way, a rectification | straightening member can be replaced | exchanged according to the ejection speed of the air ejected from a nozzle. Thereby, the total length of the gas flow path formed before and after the insertion port can be adjusted in accordance with the ejection speed of the air ejected from the nozzle without significantly changing the heat treatment apparatus.

The heat treatment apparatus may be a horizontal heat treatment apparatus, and the pressurizing chamber may be connected to a single air supply path.
With this configuration, even when the pressure gradient due to the chimney effect is generated in the vertical direction of the heat treatment chamber of the horizontal heat treatment apparatus and the pressure in the seal chamber is varied in the vertical direction accordingly, The ejection speed of the air ejected from the nozzle can be adjusted, for example, for each of a plurality of insertion ports provided in the vertical direction, and can be easily adjusted to an optimal ejection speed corresponding to the pressure difference in the vertical direction of the seal chamber.

Further, the present invention is a heat treatment in which a slit-like insertion port is formed in the outer wall of a seal chamber provided continuously to the heat treatment chamber, and an object to be treated is fed from the insertion port and continuously heat-treated in the heat treatment chamber. In the method, a step of adjusting the pressure in the seal chamber according to the pressure in the heat treatment chamber, and a pair of pressurizing chambers are provided on the outer wall of the seal chamber with the insertion port interposed therebetween, and the pressurizing chamber is provided. A step of jetting air from a pair of nozzles toward the object to be processed outside the seal chamber, and suppressing the inflow of outside air into the seal chamber; and when the air is jetted from the nozzle, the air The step of adjusting the jet speed of the pipe to the jet speed according to the pressure in the seal chamber, and the length of the cylindrical rectifying member provided continuously to the insertion port in the seal chamber according to the jet speed of the air Adjust the A step of preventing the gas in the seal chamber from flowing out to the section, and the object to be processed is passed between the nozzles from which the air has been ejected, and between the pressurizing chamber and the insertion port and the rectifying member Passing through the sealing chamber, and further feeding into the heat treatment chamber for continuous heat treatment.
By performing the heat treatment in this way, it is possible to heat treat the object to be processed in a state in which the ejection speed of the air from the nozzle and the length of the rectifying member are set to the optimum length according to the pressure in the seal chamber.

  According to the present invention, even if the ejection speed of the air blown toward the object to be processed is increased, the flow of the outside air flowing into the seal chamber is uniformly rectified, and the gas flow in the direction from the seal chamber toward the insertion port is performed. Since it can prevent, it can prevent that the gas in a seal chamber flows out outside.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the heat treatment apparatus 1 includes a box-shaped heat treatment chamber 2. The heat treatment chamber 2 is connected to a hot air circulation device (not shown) for circulating hot air therein. The heat treatment chamber 2 is provided with an exhaust port 30. The exhaust port 30 is connected to the fan 14 via an exhaust path 31. A flow rate adjusting mechanism 13 such as a valve is provided in the middle of the exhaust passage 31. The fan 14 is connected to an external gas recovery processing device (not shown).

  Sealing chambers 4, 4 are connected to outer walls 3, 3 on the left and right sides of the heat treatment chamber 2 in the drawing. The outer walls 5 and 5 of the seal chambers 4 and 4 are respectively provided with slit-like insertion ports 7 and 7 ′ for inserting the object to be treated, for example, the precursor fiber A made of polyacrylonitrile fiber. Similarly, the outer walls 3, 3 of the heat treatment chamber 2 are also provided with insertion ports 6, 6 ′ corresponding to the insertion ports 7, 7 ′ of the seal chambers 4, 4. The insertion ports 6 and 6 ′ of the heat treatment chamber 2 and the insertion ports 7 and 7 ′ of the seal chambers 4 and 4 are provided in three stages in the vertical direction of the seal chambers 4 and 4, respectively.

Inside the seal chambers 4, 4 are provided partition plates 12 that divide the insertion openings 7, 7 ′ provided in three stages in the vertical direction into separate compartments 4 a, 4 b, 4 c. Further, the seal chambers 4 and 4 are provided with exhaust ports 15 and 15, and are connected to the exhaust fans 17 and 17 through the exhaust passages 32 and 32. A flow rate adjusting mechanism 16 such as a valve is provided in the middle of the exhaust passages 32 and 32. As shown in FIG. 2, the exhaust port 15 is provided in each of the sections 4 a, 4 b, 4 c obtained by dividing the seal chambers 4, 4 by the partition plate 12. A flow rate adjusting mechanism 34 such as a valve is provided in each exhaust passage 33 connected to each exhaust port 15.
Here, the length Ls of the precursor fiber A in the running direction of the seal chamber 4 is appropriately determined in consideration of the properties of the fibers, the indoor cleaning and maintenance workability, and the like.

  A pair of pressurizing chambers 9 a and 9 b are provided on the outer walls 5 and 5 of the seal chambers 4 and 4 so as to sandwich the insertion ports 7 and 7 ′. A pair of nozzles 10a and 10b are provided in the upper and lower pressurizing chambers 9a and 9b so as to face each side through which the precursor fiber A passes. The nozzles 10a and 10b are attached to the front end corner portions of the pressurizing chambers 9a and 9b, which are preferable in terms of pressure application. These pressurizing chambers 9a, 9b and nozzles 10a, 10b constitute an air curtain means 8 on the outside of each insertion port 7, 7 '.

  As shown in FIGS. 2 to 4, the upper and lower pressurizing chambers 9 a and 9 b of the air curtain means 8 are connected to a single air supply path 35, and a flow rate adjusting mechanism 21 such as a valve is provided in the air supply path 35. Is provided. Each flow rate adjusting mechanism 21 is further connected to an air supply fan 24 via a common air supply path 37. Further, the nozzles 10a and 10b are both plate materials by two plate materials arranged outwardly from the insertion ports 7 and 7 'and directed toward the precursor fiber A fed and sent out from the insertion ports 7 and 7'. It is formed between.

  A single air supply path 35 connected to the air curtain means 8 branches into upper and lower pressurizing chambers 9a and 9b inside the air curtain means 8. At the branch point of the air supply path 35 inside the air curtain means 8, a substantially triangular cross section is arranged with the apex facing the branch point so that the supplied air is uniformly distributed to the upper and lower pressurizing chambers 9 a and 9 b. A shaped distribution plate 25 is provided.

  As shown in FIGS. 3 and 5, a perforated plate 18 is used as a screen-like rectifying means in which a large number of holes are formed in front of the nozzles 10a and 10b provided in the pressurizing chambers 9a and 9b of the air curtain means 8. , 19 are provided. Rails 38 are provided above and below the perforated plates 18 and 19, and upper and lower end portions of the perforated plates 18 and 19 are sandwiched and fixed by the rails 38. Here, the aperture ratio and the number of the perforated plates 18 and 19 are appropriately determined according to the ratio of the width and height of the pressurizing chambers 9a and 9b, the air ejection speed Vs from the nozzles 10a and 10b, and the like.

  As shown in FIG. 6, the pressurizing chambers 9a and 9b of the air curtain means 8 are fixed to the outer wall 5 of the seal chamber 4 through flange portions 36 and 36 by a detachable locking tool such as a bolt (not shown). . A cylindrical rectifying member 40 is detachably fixed to the pressurizing chambers 9a and 9b on the side of the seal chamber 4 via flange portions 41 and 41 by fasteners such as bolts, for example. Thereby, as shown in FIG. 3, the flow path of the gas flowing from the outside of the seal chamber 4 to the inside of the seal chamber 4 on the outer side and the inner side of the seal chamber 4 with the insertion ports 7 and 7 ′ sandwiched therebetween is the pressurizing chamber 9a, 9b and the cylindrical rectifying member 40 are continuously formed. Here, the flow path length La which is the total length of the flow path is the sum of the lengths of the pressurizing chambers 9a and 9b in the traveling direction of the precursor fiber A and the length Lb of the rectifying member 40. The channel length La is appropriately determined in consideration of the elements described later.

  Moreover, as shown in FIG. 1, the roll 11 which arrange | positions the precursor fiber A according to the height of the insertion ports 7 and 7 'is arrange | positioned on the outer side of the outer walls 5 and 5 of the seal chambers 4 and 4. As shown in FIG. . The rotating shaft of the roll 11 is connected to a motor, a controller, a power source, etc. (not shown) and can rotate freely. The surface of the roll 11 has a friction coefficient suitable for transmitting power to the precursor fiber A.

Next, the operation of this embodiment will be described.
As shown in FIG. 1, a plurality of precursor fibers A are fed from the uppermost insertion port 7 of the seal chamber 4 on the left side of the heat treatment apparatus 1 in a state in which the plurality of precursor fibers A are aligned parallel to the paper surface in the vertical direction. Next, the precursor fiber A passes through the insertion port 6 of the outer wall 3 of the heat treatment chamber 2 and is sent out from the insertion port 6 ′ of the outer wall 3 opposed to the heat treatment chamber 2. Further, the precursor fiber A passes through the insertion port 7 ′ of the outer wall 5 of the seal chamber 4 connected to the heat treatment chamber 2 and is sent out of the heat treatment apparatus 1. The precursor fiber A delivered to the outside of the heat treatment apparatus 1 is folded so as to be wound around the roll 11 outside the seal chamber 4, and from the insertion port 7 ′ below the inserted insertion port 7 ′, It is again sent into the heat treatment apparatus 1.

  The precursor fiber A fed into the heat treatment apparatus 1 again is sent to the outside of the heat treatment apparatus 1 through the same path in the reverse direction, and is wound around the roll 11 outside the heat treatment apparatus 1 and folded back. In this way, the precursor fiber A is repeatedly fed back to and out of the heat treatment apparatus 1 while being repeatedly folded outside the heat treatment apparatus 1 by the roll 11, and passes through the inside of the heat treatment apparatus 1 so as to meander. At this time, power is given to the precursor fiber A by the rotation of the roll 11 and the friction of the surface of the roll 11, and the precursor fiber A is continuously fed in the direction of the arrow X in FIG.

On the other hand, hot air circulates inside the heat treatment chamber 2 by a hot air circulation device (not shown), and is maintained at a temperature of, for example, 200 ° C to 300 ° C. Therefore, the precursor fiber A continuously fed repeatedly into the heat treatment chamber 2 is gradually heat-treated in the heat treatment chamber 2. At this time, a decomposition gas such as cyanide, ammonia, and carbon monoxide is generated in the heat treatment chamber 2 by the oxidation reaction of the precursor fiber A. The generated cracked gas is discharged from the exhaust port 30 provided in the heat treatment chamber 2 by the exhaust fan 14, and is recovered and processed by an external gas recovery processing device.
Further, the adjustment of the exhaust amount by the exhaust fan 14 can be performed by a flow rate adjusting mechanism 13 such as a valve, for example.

Further, the inside of the seal chambers 4, 4 becomes a negative pressure by sucking the gas inside by the exhaust fans 17, 17. Further, the heat treatment chamber 2 is heated to generate a vertical pressure distribution in which the upper part has a high pressure and the lower part has a low pressure.
Here, the pressure in each of the compartments 4 a, 4 b, 4 c of the seal chambers 4, 4 is changed according to the pressure distribution in the vertical direction in the heat treatment chamber 2 to the gas from the seal chambers 4, 4 into the heat treatment chamber 2. Inflow or outflow of gas from the heat treatment chamber 2 to the seal chambers 4 and 4 is minimized, and the gas in the seal chambers 4 and 4 from the insertion ports 7 and 7 ′ of the seal chambers 4 and 4 to the outside is minimized. Adjust pressure to prevent outflow.

  At this time, the pressure of each of the compartments 4a, 4b, and 4c can be individually adjusted by adjusting the flow rate of the gas discharged from the exhaust port 15 provided in each of the compartments 4a, 4b, and 4c by the flow rate adjusting mechanism 34. it can. Therefore, the pressure in each of the compartments 4a, 4b, and 4c of the seal chambers 4 and 4 can be individually adjusted to an appropriate pressure corresponding to the pressure distribution in the vertical direction of the heat treatment chamber 2.

  Further, in order to suppress the inflow of the outside air into the seal chambers 4 and 4 which have become negative pressure, the air outside the heat treatment apparatus 1 is supplied to the upper and lower sides of the air curtain means 8 by the air supply fan 24 as shown in FIG. An air curtain is formed by supplying air to the pressurizing chambers 9a and 9b and ejecting air from the nozzles 10a and 10b to the outside of the seal chambers 4 and 4 toward the precursor fiber A.

  As shown in FIG. 4, air supplied from a single air supply path 35 connected to the air curtain means 8 is distributed by a distribution plate 25 provided at a branch point of the air supply path 35 inside the air curtain means 8. It is uniformly distributed vertically and supplied to the pressurizing chambers 9a and 9b. The air distributed to the upper and lower pressurizing chambers 9a and 9b is uniformly rectified by pressure loss when passing through the perforated plates 18 and 19. At this time, by providing a plurality of perforated plates 18, 19 etc., it is possible to suppress the air curtain ejection unevenness while suppressing the pressure loss lower than installing one perforated plate having a smaller aperture ratio. it can.

The air that is uniformly distributed in the vertical direction and rectified is ejected from the upper and lower jet outlets at the tips of the nozzles 10a and 10b at a substantially equal jet velocity Vs, and forms an air curtain that collides with the precursor fiber A from above and below. Here, the ejection speed Vs of the air ejected from the nozzles 10a, 10b of each air curtain means 8 is adjusted to an appropriate ejection speed according to the pressure in the compartments 4a, 4b, 4c of the seal chambers 4, 4.
Here, in the following experiment, instead of the actual heat treatment apparatus 1 shown in FIG. 1, a measurement apparatus 100 having a schematic structure without the heat treatment chamber 2 shown in FIG. The flow path length La and the outside air inflow velocity Vo were measured. The insertion port 6 and the insertion port 7 of the seal chamber 4 each have an opening length of 2000 mm (length in the drawing depth direction) and an opening height Dn of 40 mm. The openings of the nozzles 10a and 10b have an opening length of 2000 mm (length in the drawing depth direction) and an opening width Wn of 2 mm. The angles θ of the nozzles 10a and 10b with respect to the horizontal plane were 30 °.
Whether the gas flows in or out of the insertion port 7 was confirmed by observing the direction of smoke flow using a smoke tester manufactured by Gastec. In addition, the air ejection speed Vs was measured using an anemone master 6071 anemometer manufactured by Kanomax.
In addition, since it is difficult to directly measure the inflow velocity Vo of the outside air, the amount of exhaust by the exhaust fan 17 and the amount of inflow from the insertion port 6 are measured using an anemone master 6141 anemometer manufactured by Kanomax Co. Calculated. The pressure in the seal chamber 4 was measured using a Manostar gauge fine differential pressure gauge manufactured by Yamamoto Electric Co., Ltd.
An example of the relationship between the measured internal pressure of the seal chambers 4 and 4 and the appropriate ejection speed Vs corresponding thereto is shown in Table 1 below and FIG.

It can be seen from Table 1 and FIG. 7 that the lower the internal pressure of the seal chambers 4 and 4, the higher the ejection speed Vs is.
Here, as shown in FIG. 2, in the heat treatment apparatus 1, the pressure chambers 9 a and 9 b of the air curtain means 8 are connected to a single air supply path 35, thereby adjusting the flow rate provided in each air supply path 35. The mechanism 21 can be adjusted to simultaneously adjust the wind speed of the air ejected from the upper and lower nozzles 10a, 10b of each air curtain means 8. Therefore, fine adjustment of the wind speed for each of the insertion openings 7 and 7 'is facilitated as compared with the conventional case. Further, the ejection speed Vs of the air ejected from the nozzles 10a, 10b of the air curtain means 8 at the insertion ports 7, 7 ′ can be individually set to an appropriate value according to the pressure in the seal chambers 4, 4. it can.

  Therefore, according to the present embodiment, the pressure gradient due to the chimney effect is generated in the vertical direction of the heat treatment chamber 2 of the heat treatment apparatus 1, and the pressure in the seal chambers 4 and 4 is varied in the vertical direction according to this. However, the ejection speed Vs of air ejected from each of the pair of upper and lower nozzles 10a and 10b is adjusted for each of the plurality of insertion ports 7 and 7 'provided in the vertical direction, and according to the internal pressure of each of the sections 4a, 4b and 4c. It is possible to easily adjust to the optimum ejection speed Vs.

Here, the length Lb of the rectifying member 40 is further adjusted according to the ejection speed Vs of the air ejected from the nozzles 10a and 10b.
FIG. 8 shows the air ejection speed Vs when the gas flow path length La is changed as shown in Table 2 below by preparing a plurality of rectifying members 40 having different lengths Lb and exchanging the rectifying members 40. And an example of a relationship between the inflow velocity Vo of the outside air flowing in from the insertion ports 7 and 7 ′ of the seal chamber 4. In the graph, diamond points represent data when the gas flow path length La is 220 mm, square points represent data when 325 mm, and triangle points represent data when 430 mm. Yes.

Even if the ejection speed Vs of the air ejected from the nozzles 10a and 10b is increased in accordance with the internal pressure of the seal chamber 4, the outside air inflow speed Vo increases as shown in FIG. 8, but the rectifying member 40 is replaced. In addition, by setting the length of the gas flow path length La to 430 mm, it is possible to reduce the outside air inflow speed Vo to a target inflow speed, for example, a target line T of about 0.2 m / s or less. As a result, the heat treatment apparatus 1 can rectify the flow of outside air flowing into the seal chambers 4, 4, and can prevent the occurrence of gas flow in the direction from the seal chambers 4, 4 toward the insertion ports 7, 7 ′. .
Table 3 and FIG. 9 below show an example of the relationship between the gas flow path length La and the outside air inflow velocity Vo using data similar to the data in Table 2 and FIG.

  In the graph shown in FIG. 9, diamond points indicate data when the ejection velocity Vs is 6 m / s, square points indicate data when the ejection velocity Vs is 10 m / s, and triangle points indicate the ejection velocity Vs. Represents the data when is set to 15 m / s. As shown in FIG. 9, when the jetting speed Vs of air from the nozzles 10a and 10b is constant, the inflow speed Vo of the outside air is decreased by increasing the gas flow path length La, for example, approximately 0.2 m / It can be reduced to below the target line T of s. As a result, the heat treatment apparatus 1 can rectify the flow of outside air flowing into the seal chambers 4, 4, and can prevent the occurrence of gas flow in the direction from the seal chambers 4, 4 toward the insertion ports 7, 7 ′. .

  FIG. 10 shows an example of the influence of the air ejection speed Vs and the gas flow path length La from the nozzles 10a, 10b on the outside air inflow speed Vo. In the figure, the circles indicate that the outside air inflow velocity Vo is about 0.2 m / s or less, which is the target value, and the gas in the seal chambers 4, 4 can be prevented from leaking out of the heat treatment apparatus 1. ing. Further, the circle marks to triangle marks indicate critical points, and the X mark indicates that the target value of approximately 0.2 m / s or less cannot be achieved. That is, these values of X indicate that in the heat treatment apparatus 1, the gas in the seal chambers 4 and 4 leaks out of the heat treatment apparatus 1 from the insertion ports 7 and 7 ′. As shown in FIG. 10, even if the ejection speed Vs is increased, by increasing the gas flow path length La, the inflowing outside air is rectified and directed from the inside of the seal chambers 4 and 4 to the insertion ports 7 and 7 ′. It is possible to prevent the gas flow in the direction from occurring.

  As described above, in the heat treatment apparatus 1, gas flow paths are provided by the pressurizing chambers 9 a and 9 b and the rectifying member 40 before and after the insertion ports 7 and 7 ′ of the seal chambers 4 and 4, and the flow path length La is set. By setting the length appropriately according to the ejection speed Vs, the flow of the outside air flowing into the seal chambers 4 and 4 is uniformly rectified, and the gas in the direction from the seal chambers 4 and 4 toward the insertion ports 7 and 7 ' Can be prevented from occurring.

  Further, by performing the heat treatment in the above-described steps, the outflow of gas from the heat treatment chamber 2 to the seal chambers 4 and 4 and the inflow of gas from the seal chambers 4 and 4 to the heat treatment chamber 2 are minimized during the heat treatment. While reducing the inflow velocity Vo of the outside air flowing from the outside of the apparatus 1 into the seal chamber 2 and preventing the gas flow in the direction from the inside of the seal chambers 4, 4 toward the insertion ports 7, 7 ′, the precursor The body fiber A can be continuously heat-treated.

Therefore, according to the present embodiment, even if the ejection speed Vs of the air blown toward the precursor fiber A is increased according to the internal pressure of the seal chambers 4, 4, the insertion openings 7, Since the flow of gas in the direction toward 7 ′ can be prevented, the gas in the seal chambers 4, 4 can be prevented from flowing out of the heat treatment apparatus 1.
In addition, by providing the rectifying member 40 so as to be detachable, for example, the ejection speed of the air ejected from the nozzles 10a and 10b without significantly changing the heat treatment apparatus 1 such as changing the size of the air seal means 8. Corresponding to Vs, the length Lb of the rectifying member 40 can be changed to adjust the length La of the gas flow path.
In addition, the outflow of gas from the heat treatment chamber 2 to the seal chambers 4 and 4 and the inflow of gas from the seal chambers 4 and 4 to the heat treatment chamber 2 during heat treatment are minimized, and the gas flows from the outside of the heat treatment apparatus 1 into the seal chamber 2. The thermal efficiency of the heat treatment apparatus 1 can be improved by suppressing the inflow velocity Vo of the outside air.

In addition, this invention is not restricted to embodiment mentioned above, A precursor fiber can be made to drive | work in the up-down direction one step-dozens of steps according to a condition. The rectifying member may be used in a vertical heat treatment apparatus.
Moreover, although this embodiment demonstrated the case where the precursor fiber which consists of polyacrylonitrile-type fiber was flame-proofed, it is also possible to use the heat processing apparatus of this invention about another to-be-processed object.

  Moreover, it is preferable to make the upper and lower opening dimensions of the insertion opening as narrow as possible within a range in which the precursor fiber can pass without contacting. This is because it is difficult for gas to flow through the insertion opening. Therefore, each insertion port is preferably a slit whose opening size can be adjusted in the vertical direction.

  The air curtain means may have a structure in which gas is supplied from both ends in the width direction. Moreover, the partition plate does not need to be provided in each stage so as to partition all stages of the seal chamber. Further, if the inside of the seal chamber 4 can be set to a negative pressure by exhausting with an exhaust fan provided in the heat treatment chamber, the seal chamber may not include the exhaust port and the exhaust fan. The gas supplied to the air curtain may not be air.

It is a schematic sectional drawing which shows the whole structure of the heat processing apparatus in embodiment of this invention. It is a partial expanded side view of the heat processing apparatus in embodiment of this invention. It is a schematic sectional drawing of the air curtain means and rectification | straightening member in embodiment of this invention. It is sectional drawing which follows the II line | wire of FIG. It is sectional drawing which follows the II-II line | wire of FIG. It is a disassembled perspective view of the air curtain means and rectification | straightening member in embodiment of this invention. It is a graph showing the relationship between the jet velocity Vs which made the horizontal axis the jet velocity Vs in embodiment of this invention, and made the vertical axis | shaft the seal chamber pressure, and a seal chamber pressure. It is a graph showing the relationship between the gas flow path length La, the ejection speed Vs, and the outside air inflow speed Vo when the horizontal axis is the ejection speed Vs and the vertical axis is the outside air inflow speed Vo in the embodiment of the present invention. 4 is a graph showing a relationship between a gas flow path length La, a jet flow speed Vs, and an external air inflow speed Vo, where the horizontal axis represents the gas flow path length La and the vertical axis represents the outside air inflow speed Vo in the embodiment of the present invention. . It is a graph showing the relationship between the gas flow channel length La, the jet velocity Vs, and the outside air inflow velocity Vo, where the horizontal axis represents the jet velocity Vs and the vertical axis represents the gas flow channel length La in the embodiment of the present invention. It is a schematic sectional drawing which shows the whole structure of the measuring apparatus in embodiment of this invention.

Explanation of symbols

1 Heat treatment equipment 2 Heat treatment room
4 Sealing chamber
5 Outer Wall 7 Insertion Port 7 ′ Insertion Port 9a Pressurizing Chamber 9b Pressurizing Chamber 10a Nozzle 10b Nozzle
35 Air supply path 40 Rectifying member A Precursor fiber (object to be processed)
Lb Length of rectifying member

Claims (4)

  In a heat treatment apparatus for continuously heat-treating an object to be processed in a heat-treatment chamber, a slit-like insertion port for inserting the object to be processed is formed on an outer wall of a seal chamber connected to the heat-treatment chamber, and the seal chamber A pair of pressurizing chambers are provided on the outer wall of the insertion hole, and a pair of nozzles for ejecting air toward the object to be processed are provided outside the seal chamber in the pressurizing chamber. A heat treatment apparatus characterized in that a cylindrical flow straightening member is provided continuously to the insertion opening.   The heat treatment apparatus according to claim 1, wherein the rectifying member is detachably provided.   The heat treatment apparatus according to claim 1, wherein the heat treatment apparatus is a horizontal heat treatment apparatus, and the pressurizing chamber is connected to a single air supply path. In the heat treatment method in which a slit-shaped insertion port is formed in the outer wall of the seal chamber continuously provided in the heat treatment chamber, and an object to be treated is sent from the insertion port and continuously heat-treated in the heat treatment chamber,
Adjusting the pressure in the seal chamber according to the pressure in the heat treatment chamber;
A pair of pressurizing chambers are provided on the outer wall of the seal chamber with the insertion opening interposed therebetween, and air is ejected from the pair of nozzles provided in the pressurizing chamber to the outside of the seal chamber and toward the object to be processed. Suppressing the inflow of outside air into the seal chamber;
Adjusting the ejection speed of the air to the ejection speed according to the pressure in the seal chamber when ejecting the air from the nozzle;
The length of the cylindrical rectifying member provided continuously to the insertion port in the seal chamber is adjusted according to the air ejection speed to prevent the gas in the seal chamber from flowing out from the insertion port to the outside. And a process of
The object to be treated is passed between the nozzles through which the air is blown, and the insertion port and the rectifying member are passed from between the pressurizing chambers to be fed into the seal chamber, and further, the heat treatment chamber A heat treatment method characterized by comprising the steps of:

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