JP5615539B2 - Continuous heat treatment method and continuous heat treatment apparatus - Google Patents

Description

  The present invention relates to a heat treatment method and a heat treatment apparatus capable of continuously heat-treating an object to be treated. Specifically, in this type of continuous heat treatment method and apparatus, the outflow of a heating medium from the inside of the heat treatment chamber and Prevents outside air from entering the heat treatment chamber.

2. Description of the Related Art Conventionally, in order to heat processing (cooking, sterilization, etc.) foods, foods, etc., those using water vapor as a heating medium are widely known. In particular, attention has recently been paid to heat processing using a heating medium such as superheated steam.
Superheated steam is generated with a steam temperature higher than the saturation temperature at a certain pressure by further heating the saturated steam. Even if the superheated steam is exposed to the outside air and the temperature is lowered, the superheated steam is not condensed if the superheated state is maintained, and has a larger amount of heat than the saturated steam at the same pressure. For example, in the heating of foodstuffs, initial condensation occurs at low temperature of the foodstuffs, and condensation heat transfer due to latent heat occurs as in the case of saturated steam, but as the product temperature rises, the condensation phenomenon disappears and moisture in the foodstuffs evaporates Begins. As a result, superheated steam is used as a heat treatment method that does not cause the inflow of condensed water into the food and has little change in taste and elution of components.

  In addition, when heat-treating foods and foods, in order to improve the productivity, it is common to continuously process them in a heat treatment chamber of a predetermined length and shape using an endless continuous conveyor or the like. is there. Thus, for example, Patent Document 1 is known as an apparatus that performs continuous processing using a heating medium such as superheated steam as described above.

Here, a brief description will be given of a continuous heat treatment apparatus that performs heat treatment using a heating medium such as superheated steam, including Patent Document 1, and an opening through which an object to be treated can pass is provided on each of an inlet side and an outlet side. A heat treatment chamber, an endless conveyor that continuously conveys the object to be processed over the opening on the inlet side and the opening on the outlet side, and a heating medium (superheated steam) is injected into the heat treatment chamber. And a heating medium generating / injecting device.
According to this kind of apparatus, it heat-processes by injecting a heating medium (superheated steam) to the process target object conveyed by the conveyor in heat processing chamber. In addition, the heat treatment chamber (superheated steam) is continuously maintained to be maintained in a predetermined heat treatment atmosphere (superheated steam atmosphere) by the heating medium (superheated steam).

However, when continuous processing is performed using a conveyor or the like, the heat treatment chamber is hollow so that the treatment objects can be sequentially conveyed in the heat treatment chamber, and the treatment objects are respectively provided on the inlet side and the outlet side. It is necessary to adopt a non-sealed space having an opening that can pass through.
Since the openings are opened on the inlet side and the outlet side in this way, the heating medium (superheated steam) in the heat treatment chamber may escape (leak) from the openings, and the outside air (air) may be discharged from the openings. May be mixed in, and a predetermined heat treatment atmosphere cannot be maintained.
Outflow of the heating medium from the heat treatment chamber and mixing of outside air (air) into the heat treatment chamber will cause a decrease in the water vapor concentration and a decrease in the rate of increase in the surface temperature of the food, and this will hinder the heating of the food. There is also a great influence on the bactericidal effect. That is, in the heat treatment apparatus, particularly in this type of continuous heat treatment apparatus, the outflow of the heating medium to the outside and the blocking of the outside air are important factors.

Patent Document 1 proposes a shielding mechanism for preventing the heating medium from flowing out of the room and blocking the outside air.
That is, in Patent Document 1, curtains are provided on the entrance side and the exit side, respectively, and the curtain is pushed open when the object to be processed enters and exits the heat treatment chamber. At other times, the openings are closed by curtains so that the heating medium flows out of the room and the outside air is blocked.

  Further, Patent Document 2 has the same configuration as Patent Document 1, and each buffer-like cushioning seal material is disposed on the inlet side and the outlet side that are open, and the object to be processed enters the heat treatment chamber. The buffer sealant is pushed open and passed through the opening only when leaving the heat treatment chamber, and at other times, the opening is closed by the buffer sealant to block the heating medium from flowing out and outside air. It is intended.

However, the shielding mechanism that pushes the object to be processed when it passes through the curtain and the buffer seal material disposed on the inlet side and the outlet side as described above causes the following inconvenience.
(1) Since the curtain and the buffer seal material are such that they can be easily pushed open by the processing object when the processing object passes, the curtain and the buffer sealing material are not at the time of passing due to the pressure of the heating medium sprayed into the heat processing chamber. However, the heating medium in the heat treatment chamber flows out to the outside.
(2) Furthermore, in the shielding mechanism in which the object to be processed is pushed open to the entrance side and the outlet side in this way, a curtain or the like is added to the object to be processed (processed object) that is heated and conveyed from the heat treatment chamber. Since the buffer seal material is in contact, there is a possibility that various bacteria may adhere to the processing object (processed object).

Therefore, Patent Document 3 has been proposed as a prior art that provides technical means for preventing the heating medium from flowing out of the room and blocking outside air without using such a mechanical shielding mechanism.
Patent document 3 pays attention to the characteristic that superheated steam is lighter than air, and employs a mechanism in which superheated steam tends to stay.
Specifically, the heat treatment chamber provided with openings (hereinafter also referred to as opening inlets and opening outlets) through which the object to be processed can be conveyed and passed on the inlet side and the outlet side, respectively, is used. A processing object conveyance space in the heat treatment chamber communicating between the opening inlet and the opening outlet is configured in a step shape. In other words, the opening inlet side and the opening outlet side are set to low positions, and the processing region (heating treatment atmosphere region) in which the heating medium is sprayed and heat-treated is set to a high position.
According to this, superheated steam that is lighter than air stays in the processing area higher than the opening inlet and the outlet outlet, and therefore flows out from the opening inlet and outlet outlet located lower than the processing area. That is, there is no risk of doing so. Therefore, according to this technical means, it is not necessary to separately provide a mechanical shielding mechanism such as a curtain or a buffer seal material at the opening inlet or the opening outlet.

  However, even such a prior art is in a state in which no external shielding is applied at the opening inlet or the outlet outlet, it is sufficient to prevent outside air from being mixed into the heat treatment chamber (processing area). However, the mixing of outside air into the heat treatment chamber causes a decrease in water vapor concentration and a decrease in the rate of increase in the surface temperature of the food, which not only hinders the heating of the food, but also has a great sterilizing effect. There is an impact.

  In view of this, the present inventor, in a continuous heat treatment means for continuously heat-treating a processing object such as a foodstuff using water vapor, prevents the heating medium from flowing out of the heat treatment chamber, and in the heat treatment chamber (treatment region). ) Has intensively studied to invent a new technical means that can prevent outside air from being mixed into the air.

The present inventor has already filed a number of applications including Patent Document 4 to provide a new heating medium different from the generally known superheated steam as a heating medium for the heat treatment. Specifically, it has the following configuration.
The inside of the heat treatment chamber is heated to normal pressure and about 115 ° C. by the treatment chamber heating mechanism,
The heating medium generation mechanism includes a pipeline for circulating the water supplied from the water supply source, and boiles the water supplied in the pipeline at a predetermined temperature and a predetermined pressure so that water vapor and hot water are contained in the tube. A gas-liquid mixture comprising: a heating medium injection nozzle provided at the tip of the pipe line and controlled to have an internal pressure of 0.19 MPa or more, a nozzle internal temperature of 120 ° C. or more, and a nozzle water amount of 0.7 gr / sec or more. The gas-liquid mixture is jetted into the controlled heat treatment chamber, thereby adjusting the heat treatment chamber to a heat treatment atmosphere filled with a heating medium in which superheated steam and high-temperature fine water droplets are mixed. Yes.
However, since the heat treatment apparatus having this kind of configuration is of a batch type, it has never been possible to improve productivity. Even if heat treatment is performed using such a novel heating medium, it is difficult to obtain the same effect in a non-sealed heating chamber. Therefore, since there is a high demand for changing this type of heat treatment apparatus to a continuous heat treatment apparatus, it was decided to carry out this development together.

JP 2003-310438 A JP-A-2005-341834 Japanese Patent Application Laid-Open No. 2006-087441 JP 2009-091386 A

  The present invention has been made to solve such problems, and the object of the present invention is a continuous heat treatment method and a heat treatment apparatus capable of sequentially heat-treating a large number of treatment objects in succession. In addition, while using a non-sealed heat treatment chamber having openings through which the object to be treated conveyed can pass at least on the inlet side and the outlet side, the outflow of the heating medium to the outside and It is an object of the present invention to provide a continuous heat treatment method and a continuous heat treatment apparatus that can sufficiently block outside air.

In order to achieve such an object, the first invention is provided with an inlet opening on one end side and an outlet opening on the other end side, an inlet side outside air shielding area near the inlet, and an outlet side near the outlet. A heat treatment chamber divided into an outside air shielding region and a heat treatment region continuously disposed between the inlet side outside air shielding region and the outlet side outside air shielding region;
A heating medium supply step of heating the inside of the heat treatment region to a predetermined temperature or higher by a heating mechanism inside the treatment chamber, and injecting a heating medium into the heated heat treatment region to make the inside of the heat treatment region a heat treatment atmosphere When,
A heat treatment step of carrying and heat-treating the object to be treated in the heat treatment region ;
The heating portion of the heating atmosphere of the processing area the sucked to the heat treatment outside the area, after generating the reheated medium volume expansion by heating above a predetermined temperature, said volume expanded reheated medium the inlet side Reheating medium generation injection in which a high-temperature reheating medium is retained in the inlet side outside air shielding area and the outlet side outside air shielding area by continuously injecting into the outside air shielding area and the outlet side outside air shielding area, respectively. Process,
Reheating medium overflowing from each of the inlet side outside air shielding area and the outlet side outside air shielding area on the upstream side of the inlet side outside air shielding area and the downstream side of the outlet side outside air shielding area, and in the vicinity of the inlet and the vicinity of the outlet It is a heat treatment method characterized by having an outdoor suction step for preventing outside air from entering the heat treatment region by sucking outside air .

In a second aspect based on the first aspect, the heating medium supply step comprises
The inside of the heat treatment area is controlled at normal pressure and about 115 ° C.,
The water supplied from the water supply source at a rate of 0.7 gr / sec or more is boiled at a predetermined temperature and a predetermined pressure to produce a gas-liquid mixture composed of water vapor and hot water, and the gas-liquid mixture is subjected to a heat treatment region. A heating medium spray nozzle for spraying into the inside,
The heating medium spray nozzle is controlled to have an internal pressure of 0.19 MPa or more and a nozzle internal temperature of 120 ° C. or more.
Heat treatment filled with a heating medium in a state where superheated steam and high-temperature fine water droplets are mixed in the heat treatment region by injecting a gas-liquid mixture into the heat treatment region via the heating medium injection nozzle. Adjust to the atmosphere,
The reheating medium is superheated steam produced by reheating the heating medium in the heat treatment region adjusted to the heat treatment atmosphere and volume-expanded superheated steam.

A third invention is the heat treatment method according to the first invention or the second invention, wherein the heating medium is continuously ejected during the heat treatment of the object to be treated.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the reheating medium is sprayed in an expanded manner toward the inlet side outside air shielding area and the outlet side outside air shielding area. It is that it was set as the heat processing method characterized by these.

5th invention provides the inlet opened on the one end side, and the exit opened on the other end side, the inlet side external air shielding area | region near an inlet, the outlet side outdoor air shielding area | region near an outlet, and the said inlet side outdoor air shielding placed in the region and the outlet side outside air shielding the heat treatment chamber of the heat treatment zone and continuously heating chamber which is divided into a heat treatment region is disposed between the region, the predetermined temperature to a heat treatment zone A process chamber heating mechanism that heats and adjusts to a predetermined heat treatment atmosphere;
A transport mechanism for transporting the processing object from the inlet toward the outlet;
A heating medium generating mechanism including a heating medium spray nozzle that sprays the heating medium into the heat treatment region of the heat treatment chamber;
A suction port provided in at least a part of the heat treatment region of the heat treatment chamber , a blowout port provided in the inlet-side outside air shielding region and the outlet-side outside air shielding region, and the suction port and the blowout port communicated with each other. A communication pipe, a suction fan that is provided at a predetermined location of the communication pipe and forcibly sucks out the heating medium sprayed into the heat treatment region from the suction port into the communication pipe, and a heating medium sucked out by the suction fan A heating section that generates a reheat medium that has undergone volume expansion by heating to a predetermined temperature or more in the communication pipe, and the generated reheat medium from the outlet to the inside of the inlet side outside air shielding area and inside the outlet side outside air shielding area A reheating medium generating / injecting mechanism including a reheating medium injecting unit that injects each of the
On the upstream side of the inlet side outside air shielding area and the downstream side of the outlet side outside air shielding area, the reheating medium overflows from the inlet side outside air shielding area and the outlet side outside air shielding area, and near the inlet and the outlet. Each has an outdoor suction section that sucks in some outside air,
The inlet-side outside air shielding area and the outlet-side outside air shielding area are formed of a reheating medium in which a high-temperature reheating medium tends to stay by being continuously ejected through the reheating medium ejection mechanism . The heat treatment apparatus is characterized by functioning as an injection / retention area.

In a sixth aspect based on the fifth aspect, the heat treatment region includes a treatment chamber heating mechanism, and is heated to about 115 ° C. at normal pressure and by the treatment chamber heating mechanism.
  The heating medium generating mechanism includes a heating unit, a pipe line that is heated by the heating unit in communication with a water supply source, and a heating unit that is provided at a tip part of the pipe line and has a tip facing the heat treatment region. A medium injection nozzle, and the heating medium injection nozzle is controlled to have an internal pressure of 0.19 MPa or more and an internal temperature of 120 ° C. or more,
  Producing a gas-liquid mixture consisting of water vapor and hot water in the pipeline by boiling water supplied at 0.7 g / sec or more into the pipeline at a predetermined temperature and pressure,
  Heat treatment filled with a heating medium in a state where superheated steam and high-temperature fine water droplets are mixed in the heat treatment region by ejecting the gas-liquid mixture into the heat treatment region through the heating medium injection nozzle. Adjusted to the atmosphere,
  The heat treatment is characterized in that the reheat medium is superheated steam that is generated by reheating the heat medium in the heat treatment region adjusted to the heat treatment atmosphere by a reheat medium production and injection mechanism and volume-expanded. It is a device.

A seventh invention is the heat treatment apparatus according to the fifth or sixth invention, wherein the heating medium is continuously ejected during the heat treatment of the object to be treated.

In an eighth aspect based on any one of the fifth aspect to the seventh aspect, the reheating medium injection part is provided between the outlet of the suction fan and the connection opening provided above the inlet side outside air shielding area. And it is formed and arranged in a funnel shape with a downward slope between the outlet of the suction fan and the connection opening provided above the outlet side outside air shielding region,
Reheating medium is sprayed in an expanded manner from the respective reheating medium spraying portions formed in the descending funnel shape toward the inside of the inlet side outside air shielding area and the inside of the outlet side outside air shielding area,
The boundary between the inlet side outside air shielding area and the heat treatment area and the boundary between the outlet side outside air shielding area and the heat treatment area are respectively injected into the inlet side outside air shielding area and the outlet side outside air shielding area. The heat treatment apparatus is characterized in that a boundary wall is provided for forming in a region where the heating medium is likely to stay.

In a ninth aspect based on any one of the fifth aspect to the eighth aspect, the outdoor suction portion is continuously provided on the upstream side of the inlet side outside air shielding area and the downstream side of the outlet side outside air shielding area. And
Including a box portion having a suction space opened toward the processing object mounting surface of the transport mechanism, and a suction fan communicating with the box portion;
  The suction operation of the suction fan forcibly sucks the outside air near the processing object mounting surface of the transport mechanism, and the reheating medium is drawn out from the inlet side outside air shielding area and the outlet side outside air shielding area by negative pressure. The heat treatment apparatus is characterized in that it is sucked into the suction space and discharged.

According to a tenth aspect of the present invention, in any one of the fifth to ninth aspects, the processing chamber heating mechanism is paired in a substantially central region in the transport direction within the heat treatment region with an interval wider than the width of the transport mechanism. A coiled heating unit disposed at
Between the pair of coiled heating units, a heat treatment chamber stirring fan that stirs the heat treatment atmosphere in the heat treatment region so as to spread throughout the room,
Between the heat treatment chamber agitating fan and a pair of treatment chamber heating mechanisms arranged so as to sandwich the fan, an air flow that is agitated by moving on the conveyance mechanism when the fan is blown by the rotation operation of the fan. The heat treatment apparatus is characterized by including a fan guard that can be generated.

  According to the present invention, while using an unsealed heat treatment chamber provided with openings through which the object to be treated which has been conveyed can pass at least on the inlet side and the outlet side, the heating medium is moved out of the room. It is possible to provide a continuous heat treatment method and a continuous heat treatment apparatus that can sufficiently prevent the outflow of air and the blocking of outside air. That is, even if it is a continuous heat treatment that must be performed using a non-sealed heat treatment chamber, the heat treatment region is treated in a state close to hermetic sealing without using a mechanical sealing mechanism, and heating is performed. The outflow of the medium to the outside and the blocking of the outside air could be sufficiently achieved.

It is a schematic plan view which shows one Example of the continuous heat processing apparatus of this invention. It is a schematic front view which shows one Example of the continuous heat processing apparatus of this invention. It is a schematic side view which shows one Example of the continuous heat processing apparatus of this invention. It is a schematic longitudinal front view which shows one Example of the continuous-type heat processing apparatus of this invention. It is a schematic longitudinal side view which shows one Example of the continuous-type heat processing apparatus of this invention. It is a schematic explanatory drawing which shows the generation | occurrence | production mechanism in one Embodiment of the heating medium used for the continuous heat processing apparatus of this invention.

DESCRIPTION OF SYMBOLS 1 Heat processing chamber 2 Inlet 3 Outlet S1 Inlet side outside air shielding area S2 Outlet side outside air shielding area S3 Heat processing area 12 Conveyance mechanism 13 Heating medium production | generation mechanism 17 Heating medium injection | spray nozzle 18 Reheating medium production | generation injection mechanism 19 Inlet 20 Outlet 21 Connecting pipe 22 Suction fan 23 Heating unit 24, 25 Reheating medium injection unit F Heat treatment atmosphere H Hot water M Steam T Process target SK Reheating medium KM Superheated steam KH High temperature fine water droplets

  Hereinafter, an embodiment relating to a heat treatment method of the present invention and a heat treatment apparatus using the heat treatment method will be described. Note that this embodiment is merely an example of the present invention, and is not construed as being limited thereto, and the design can be changed within the scope of the present invention.

  1 to 6 show an example of the heat treatment apparatus of the present invention. The heat treatment apparatus includes a heat treatment chamber 1, a transport mechanism 12 that continuously conveys the processing target T into the heat treatment chamber 1, and a heat treatment. A heating medium generating mechanism 13 for injecting the heating medium into the chamber 1 and a part of the heating processing atmosphere F in the heating processing chamber 1 are sucked out to generate the reheating medium SK, and the reheating medium SK is heated again. A reheating medium generating / injecting mechanism 18 that prevents the heating medium (heat treatment atmosphere F) from flowing out of the room and preventing the outside air G from entering the room by being injected into the chamber 1 (FIGS. 1 to 6). reference.).

The heat treatment chamber 1 is formed in a non-sealed rectangular shape having a predetermined length with an inlet 2 opened on one end side and an outlet 3 opened on the other end side, and is disposed on a predetermined base 4. (See FIGS. 1 to 4). In the figure, 5 is an inspection door.
In this embodiment, the heat treatment chamber 1 includes an inlet-side outside air shielding area S1 near the inlet 2, an outlet-side outside air shielding area S2 near the outlet 3, the inlet-side outside air shielding area S1, and the outlet-side outside air shielding area S2. (See FIG. 4).

Although not particularly limited in the present invention, the inlet-side outside air shielding area S1 and the outlet-side shielding area S2 are processed by a transfer mechanism 12 described later at a boundary portion between the heat treatment area S3. A boundary wall 6 protruding toward the room is provided so as not to hinder the conveyance of the object T (an outline is shown in FIG. 4). In this embodiment, the boundary wall 6 is provided so as to protrude from the inner surface of the front wall 1a, the inner surface of the rear wall 1b, the inner surface of the ceiling wall 1c, and the inner surface of the bottom surface 1d.
In the figure, reference numeral 6 a denotes a through hole provided in the boundary wall 6. Even an embodiment that does not include the boundary wall 6 is within the scope of the present invention.

Further, in the present embodiment, the heating chamber 7 is provided with a heating chamber 7 for adjusting the heating area S3 in the heating chamber 1 to a predetermined temperature or higher.
The processing chamber heating mechanism 7 is, for example, as shown in FIGS. 4 to 6, a coil as an indoor heater formed in a long shape in the conveying direction of the processing target T (the direction indicated by the arrow Y in FIG. 4). A heating unit S3 in the heating processing chamber 1 that is parallel to the transport mechanism 12 and wider than the conveyor width of the transport mechanism 12. A pair of ceiling walls 1c is provided.
The coiled heating unit 7 has both end portions 7a and 7b projecting from the outer surface of the ceiling wall 1c of the heat treatment chamber 1, and the both end portions 7a and 7b communicate with a predetermined heat source (not shown). . That is, the coiled heating unit 7 of the present embodiment is disposed in a suspended manner from the inner surface of the ceiling wall 1c of the heat treatment region S3 into the region S3.
In this embodiment, the coil-shaped heating unit 7 controls the heating in the heat treatment chamber 1 at normal pressure and about 115 ° C. (preferably 105 ° C. to 120 ° C.).
In addition, the heat treatment chamber 1 is formed by selecting a material that can be kept warm in order to control heating to the predetermined temperature or higher. In addition, about the shape and structure of the process chamber heating mechanism 7, a design change is possible suitably, and it is not limitedly interpreted to a present Example at all.

In the present embodiment, a heat treatment chamber stirring fan 8 is provided on the ceiling wall 1c of the heat treatment region S3 of the heat treatment chamber 1 (see FIGS. 5 and 6). A fan impeller 8b and a driving source (motor) arranged outside the heat treatment chamber 1 are shown. In FIG. 4, only the drive source 8b is shown, and the illustration of the impeller 8a is omitted. The heat treatment chamber agitating fan 8 agitates the heat treatment atmosphere (heating medium) in the heat treatment chamber 1 so as to spread throughout the room, thereby improving the heat treatment efficiency.
Reference numeral 9 in the drawing denotes a fan guard having a function of blocking the radiant heat from the coiled heating unit 7 and the throttle of the impeller 8a for generating the airflow N when the impeller 8a rotates and blows air. It is.

Further, in the figure, reference numeral 10 denotes a drain pipe for collecting condensed water generated in the heat treatment chamber 1, which is disposed outside the bottom surface 1d of the heat treatment chamber 1 in the conveying direction of the object to be treated. A predetermined position of the processing chamber 1, in this embodiment, a predetermined position of the bottom surface 1d of the heat treatment chamber 1, that is, for example, the inner surface of the bottom surface 1d of the heat treatment region S3, and the inner surface of the bottom surface 1d of the inlet side outside air shielding region S1, Disposed on the inner surface of the bottom surface 1d of the outlet-side outside air shielding area S2 is communicated with a drain port 11 provided in a substantially circular shape.
In addition, the hole shape of the drain port 11 may be formed in a long shape in the conveying direction of the object to be processed, and the number of holes is not limited to one or more. Further, in order to easily collect condensed water, the inner surface of the bottom surface 1d may be formed in a downward slope toward the drain port 11.

The transport mechanism 12 sequentially transports the processing target T from the inlet 2 toward the outlet 3 and is not particularly limited. In this embodiment, the transport mechanism 12 is an endless metal conveyor chain. Then, it is rotationally driven from the inlet 2 side to the outlet 3 side by a predetermined drive mechanism K (see FIGS. 1 to 6). Any material that can withstand a predetermined temperature in the heat treatment chamber 1 is not particularly limited to the shape and material of this embodiment.
A in the figure indicates a transport rod used to transport the processing object T. In this embodiment, the transport rod A is used, but the present invention is not limited to this.

In the present embodiment, the heating medium generating mechanism 13 employs a mechanism having the following configuration.
The heating medium generation mechanism 13 includes a heating chamber (heating unit) 14 formed in a cylindrical shape having a predetermined length, a metal heating pipe (pipe) 15 partially including the heating chamber 14, The heating medium spray nozzle 17 is arranged on the front end side of the heating pipe line 15 and is mounted and disposed in the heat treatment chamber 1 via the nozzle header 16.

The heating line 15 is formed to have a predetermined inner diameter and length, and water supplied to the inside via a predetermined pump (for example, an electromagnetic metering pump) is set to a predetermined temperature by the heating chamber 14. Heating is possible.
The amount of water supplied into the heating pipe line 15 is 0.7 gr / sec or more, preferably 0.7 gr / sec to 25 gr / sec. The configuration of the heating chamber 14 and the diameter and length of the heating pipe line 15 are not particularly limited and can be appropriately designed within the scope of the present invention.

As shown in FIGS. 4 to 6, the heating medium spray nozzle 17 projects from the outer surface of the ceiling wall 1 c of the heat treatment chamber 1 toward the heat treatment region S <b> 3 of the heat treatment chamber 1 through the heating pipe 15. In this embodiment, the nozzle header 16 is arranged in the length direction of the heat treatment region S3, that is, in the heat treatment region S3 over the conveying direction of the processing target T, and the nozzle header 16 is interposed therebetween. A plurality are arranged.
The heating medium spray nozzle 17 in the present embodiment has a nozzle inner diameter of 0.1 mm to 10 mm (preferably 0.5 mm to 5 mm), a nozzle internal pressure of 0.19 MPa or more (preferably 0.19 MPa to 0.41 MPa), Nozzle temperature: controlled to 120 ° C. or higher (preferably 120 ° C. to 145 ° C.).
In this embodiment, three each are arranged via the nozzle header 16 along the front wall 1a side and the rear wall 1b side. Further, in the present embodiment, the ejection port (nozzle tip) 17a of the heating medium ejection nozzle 17 is close to the upper surface side (surface portion near the ceiling wall 1c) of the coiled heating unit 7 and slightly transport mechanism 12 ( It arrange | positions so that it may face the process target object T) direction. That is, the gas-liquid mixture (water vapor M and hot water H) is designed to be injected obliquely toward the transport mechanism 12 (processing object T). In addition, the said injection direction is not limitedly interpreted by a present Example.
Since the heat treatment chamber stirring fan 8 is disposed in the heat treatment chamber 1 and the heat treatment chamber 1 is stirred, the injection port 17a of the heating medium injection nozzle 17 is as close to the center of the heat treatment region S3 as possible. Is effective. The number of the heating medium spray nozzles 17, the angle of the heating medium 17 and the like can be appropriately changed in design, and are not limited to the present embodiment.
The gas-liquid mixture (water vapor M and hot water H) is jetted continuously during the heat treatment of the processing target T. The term “continuous” is a concept that includes a mode of intermittent injection at a slight interval.

The heat treatment atmosphere in the heat treatment chamber 1 of the present invention will be described with reference to FIG.
First, water is supplied from the water supply source into the heating pipe line 15 through the metering pump P at 0.7 gr / sec, and the supplied water is supplied to the heating chamber 14 at a predetermined temperature and a predetermined pressure (120 ° C. or higher). , 0.19 MPa or more), a gas-liquid mixture composed of water vapor M and hot water H is generated in the heating line 15.
Then, the gas-liquid mixture is placed in the heat treatment chamber 1 which is controlled to be heated to about 115 ° C. as described above through the heating medium spray nozzle 17 which is controlled to have a nozzle internal pressure of 0.19 MPa or more and a nozzle internal temperature of 120 ° C. or more. By ejecting, the inside of the heat treatment chamber 1 is adjusted to a heat treatment atmosphere F filled with a heating medium in which superheated steam KM and high-temperature fine water droplets KH are mixed.
That is, when the amount of water supplied from the water supply source into the heating pipe 15 via the metering pump P exceeds the flow rate of the superheated steam KM injected from the heating medium injection nozzle 17, the excess of the supply water amount is It is injected from the heating medium injection nozzle 17 together with the superheated steam KM as high temperature fine water droplets KH, not as superheated steam.

After the reheating medium generation / injection mechanism 18 sucks a part of the heat treatment atmosphere F in the heat treatment chamber 1 out of the heat treatment chamber 1 and heats it to a predetermined temperature or more to generate a reheat medium SK that has undergone volume expansion. The mechanism for injecting the reheated medium SK expanded in volume into the heat treatment chamber 1 includes a suction port 19, a discharge port 20, a communication pipe 21, a suction fan (blower) 22, a heating unit 23, and a reheating medium injection unit. (24, 25).
An example of a specific mechanism will be described below.

A substantially circular suction port 19 penetrating at a predetermined size into a predetermined position (substantially central position in the height direction of the heat processing chamber 1) of the rear wall 1b of the heat processing chamber 1 in which the heat processing region S3 is provided. (See FIGS. 4 and 5).
And the substantially rectangular ejection opening 20 penetrated by the predetermined | prescribed magnitude | size at the upper surface predetermined position of the ceiling wall 1c of the heat processing chamber 1 in which the entrance side outside air shielding area | region S1 and the exit side outside air shielding area | region S2 are provided, respectively. Provided (see FIGS. 1 and 4).
Then, a communication pipe 21 communicating with the suction port 19 and the ejection port 20 is provided.
The connecting pipe 21 is connected to the heat treatment chamber 1 so that the connecting pipe 21 can communicate with the two outlets 20 and 20 from the single suction port 19, and the connecting pipe portion 21a. A single straight pipe portion 21b provided in a vertical shape in communication with the left horizontal pipe portion 21d and a right horizontal pipe portion that are bifurcated via a branch pipe portion 21c at the upper end of the straight pipe portion 21b. 21e, a left fan connecting pipe portion 21f that communicates the left lateral pipe portion 21d and the left suction fan (left blower) 22, and a right connection pipe that communicates the right lateral pipe portion 21e and the right suction fan (right blower) 22 21g (refer to FIG. 1 to FIG. 5).

A heating portion 23 is provided at a predetermined location of the communication tube 21 to generate the reheated medium SK that is expanded in volume by heating the sucked heating medium (heat treatment atmosphere F) to a predetermined temperature or higher in the communication tube 21. .
In the present embodiment, one coil-like heating part (superheated steam generating heater) 23 is provided as an example of the heating part 23 in the straight pipe part 21b, one for each of the left horizontal pipe part 21d and the right horizontal pipe part 21e. A coiled heating unit (superheated steam generating heater) 23 is disposed (see FIGS. 4 and 5).
The suction fan (blower) 22 is a fan that forcibly sucks the heat treatment atmosphere (heating medium) F in the heat treatment chamber 1 from the suction port 19 into the communication pipe 21, and the left connection pipe portion 21 d It is disposed between the left reheating medium ejection part 24 and between the right connection pipe part 21e and the right reheating medium ejection part 25.
The reheating medium injection units 24 and 25 are configured by guide portions 24a and 25a formed in an expanding shape from the outlets of the fans 22 and 22 toward the discharge ports 20 and 20, and the discharge ports 20 and 20, respectively. The generated reheating medium SK is continuously ejected from the ejection ports 20 and 20 into the heat treatment chamber 1, that is, into the inlet side outside air shielding area S1 and the outlet side outside air shielding area S2.

Therefore, a part of the heat treatment atmosphere (heating medium) F forcedly sucked from the suction port 19 through the suction fans 22 and 22 is disposed in the straight pipe portion 21b and the left and right horizontal pipe portions 21d and 21e. Each of the heating sections (coiled heating sections) 23, 23, 23 is heated to a predetermined temperature while passing through the pipe 21, and serves as the reheating medium SK for the inlet side outside air shielding area S1 and the outlet side. Injected continuously toward the outside air shielding area S2.
For example, the reheating medium SK is superheated steam that is generated by reheating the heating medium in the heat treatment chamber 1 adjusted to the heat treatment atmosphere F by the reheating medium generation and injection mechanism 18 and volume-expanded.
The temperature of the reheating medium (superheated steam) SK is set, for example, about 10 ° C. higher than the temperature in the heat treatment chamber 1. Depending on the supply amount of the heating medium and the like, it is necessary to adjust the increase in the specific volume (volume expansion) by appropriately raising the heating temperature of the reheating medium (superheated steam) SK.

The reheating medium ejecting units (the left reheating medium ejecting unit 24 and the right reheating medium ejecting unit 25) have their ejection unit tips from above the heat treatment chamber 1 to the inlet side outside air shielding region S1 and the outlet side outside air shielding region S2. The reheating medium SK is positioned so as to be capable of being jetted.
Accordingly, the superheated steam (reheating medium) SK having an expanded volume continuously injected into the inlet-side outside air shielding area S1 and the outlet-side outside air shielding area S2 stays in the respective areas S1 and S2 and has a considerable amount. Since it flows into the heat treatment chamber 1 and the remainder flows out of the room, the outflow of the heating medium to the outside and the entry of outside air into the heat treatment chamber 1 can be prevented. In particular, according to the present embodiment, the boundary walls 6 are provided between the inlet side outside air shielding area S1 and the heat treatment area S3 and between the outlet side outside air shielding area S2 and the heat treatment area S3, respectively. Due to the respective boundary walls 6, the volume-expanded superheated steam SK is easily retained in the respective shielding regions S <b> 1 and S <b> 2.

  In addition, although description was given of an embodiment in which the suction port 19 is provided at one location and the ejection ports 20 and 20 are provided at two locations of the inlet-side outside air shielding region S1 and the outlet-side outside air shielding region S2, a plurality of suction ports 19 are provided. And within the scope of the present invention. In addition, at least two locations of the ejection port 20 of the inlet side outside air shielding region S1 and the outlet side outside air shielding region S2 are indispensable, but this does not prevent any further provision of the ejection port.

  Although not particularly limited, in the present embodiment, the inlet upper outside 2a and the outlet upper outer 3a of the heat treatment chamber 1 overflowed from the inlet side outside air shielding area S1 and the outlet side outside air shielding area S2 to the outside. In addition to the reheating medium SK, outdoor suction portions 26 and 26 for sucking outside air G near the inlet and the outlet are provided.

The outdoor suction portion 26 is disposed on the left side wall 1e on the inlet 2 side where the inlet 2 of the heat treatment chamber 1 is provided and the right side wall 1f on the outlet 3 side where the outlet 3 is provided.
In this embodiment, since the outdoor suction portions 26 and 26 on the inlet 2 side and the outlet 3 side have the same configuration, the outdoor suction portion 26 on the inlet 2 side will be described below. The description of the suction part 26 is omitted.

The outdoor suction portion 26 is attached to the left side wall 1e on the inlet 2 side, and has a first box portion having a first suction space 26a that opens greatly toward the processing object T placement surface 12a of the transport mechanism 12 toward the inlet 2. A second box portion 26d having a second suction space 26c that communicates with the first suction space 26a and opens smaller than the first suction space 26a on the upper surface of the first suction space 26a; The suction fan 26f is provided in communication with the outlet side opening 26e of the box part 26d, and the discharge pipe part 26g is in communication with the outlet side of the suction fan 26f.
Since it comprised in this way, the reheating medium SK which was ejected to the entrance side outside air shielding area | region S1 and overflowed from the entrance 2 is forcibly sucked into the 1st suction space 26a by the suction fan 26f of the outdoor suction part 26. FIG. At this time, the outside air G in the vicinity of the inlet 2 is also sucked together into the first suction space 26a. Then, the sucked reheating medium SK and the outside air G are sent to the discharge pipe part 26g via the second suction space 26c, and discharged from the tip opening 26h of the discharge pipe part 26g to the outside air side.

  The heat treatment method of the present embodiment includes a heating medium supply step, a heat treatment step, and a reheating medium generation jetting step that are performed in the above-described heat treatment apparatus.

"Heating medium supply process"
In this embodiment, the inside of the heat treatment chamber 1 is controlled to be heated to a predetermined temperature or higher, for example, about 115 ° C. as described above.
Then, water is supplied from the water supply source through the metering pump P into the heating pipe line 15 at 0.7 gr / sec or more. Then, the water supplied in this way is boiled at a predetermined temperature and a predetermined pressure (120 ° C. or higher, 0.19 MPa or higher) by the heating chamber 14, thereby comprising water vapor M and hot water H in the heating pipe line 15. A gas-liquid mixture is produced.
And, by ejecting the gas-liquid mixture into the heat-treated heat treatment chamber 1 through the heating medium spray nozzle 17 controlled to a nozzle internal pressure of 0.19 MPa or more and a nozzle internal temperature of 120 ° C. or more, The inside of the heat treatment chamber 1 is adjusted to a heat treatment atmosphere F filled with a heating medium in a state where superheated steam KM and high-temperature fine water droplets KH are mixed.

"Heat treatment process"
Next, in the heat treatment chamber 1 adjusted to the predetermined heat treatment atmosphere F, the predetermined treatment target T is placed on the conveyance rod A and sequentially conveyed to be continuously heat-treated.
That is, the processing object T transferred to the heat treatment chamber 1 by the transfer mechanism 12 is transferred in the heat treatment chamber 1 having a predetermined heat treatment atmosphere F over a predetermined time, so that the heating target T is heated. Heat treatment is performed by a heat treatment atmosphere (heating medium) F filled in the treatment chamber 1. That is, according to the present embodiment, condensation heat transfer is generated on the surface of the processing target T by the high-temperature fine water droplets KH. Further, the surrounding area is filled with superheated steam KM, and fine water droplets that have lost their latent heat due to condensation heat transfer evaporate into the superheated steam KM. As a result, like the superheated steam, there is no influence of the condensed water on the processing target T, and further, the heating characteristic is obtained in which the internal moisture is hardly reduced by evaporation.

"Reheating medium generation injection process"
In the reheating medium generation and injection step, first, a part of the heat treatment atmosphere F in the heat treatment chamber 1 is sucked out from the suction port 19 into the communication pipe 21 by the suction fans 22 and 22. Then, the heating medium sucked into the connecting pipe 21 is heated to a predetermined temperature or more by the coiled heating parts 23, 23, 23 in the connecting pipe 21 to generate a reheat medium (superheated steam) SK that has undergone volume expansion. To do.
After that, the volume-expanded reheating medium (superheated steam) SK is transferred to the inlet side outside air shielding area S1 and the outlet side outside air shielding area S2 in the heat treatment chamber 1, and the left reheating medium ejection part 24 and the right reheating medium ejection part. 25 are ejected through the respective ejection ports 20 and 20.

  The ejected volume-expanded reheating medium (superheated steam) SK stays in the respective regions S1 and S2, and a considerable amount flows into the heat treatment chamber 1, and the remainder flows out of the chamber (overflows). Therefore, it is possible to prevent the heating medium from flowing out into the room and the outside air from entering the room. In addition, since the heat treatment atmosphere (heating medium) F itself that is filled in the heat treatment chamber 1 is a heating medium in which the superheated steam KM and the high-temperature fine water droplets KH are mixed, the heat treatment chamber 1 in the heat treatment atmosphere F There is no problem even if superheated steam (reheating medium) SK flows into the inside. Further, the high-temperature fine water droplets KH flying in the superheated steam KM are further refined with the passage of distance, and finally evaporate to become superheated steam. It is possible to easily generate the high-temperature superheated steam SK by sucking out a part of the heating medium existing in the processing region S3 and reheating it. In addition, the cost-effectiveness for this can be relatively low.

In addition, according to the present embodiment, since the configuration in which the outdoor suction portions 26 and 26 are provided in the inlet upper outside 2a and the outlet upper outer 3a of the heat treatment chamber 1, the inlet side outside air shielding region S1 and the outlet side outside air shielding region are employed. The reheating medium (superheated steam) SK ejected to S2 and overflowing from the inlet 2 and the outlet 3 is forced into the first suction spaces 26a and 26a by the suction fans 26f and 26f of the outdoor suction portions 26 and 26, respectively. Inhaled. At this time, the outside air G near the inlet 2 and the outside air G near the outlet 3 are also sucked into the first suction spaces 26a and 26a together. Then, the sucked reheating medium (superheated steam) SK and the outside air G are sent to the discharge pipe portions 26g and 26g via the second suction spaces 26c and 26c, and the leading ends of the discharge pipe portions 26g and 26g are opened. It is discharged from 26h, 26h to the outside air side.
Therefore, the outside air G in the vicinity of the inlet 2 and the outlet 3 is forcibly sucked and discharged by the outdoor suction portions 26 and 26 without entering the heat treatment chamber 1. Since the outside air is prevented from entering, the heat treatment chamber 1 can always maintain a predetermined heat treatment atmosphere F.

In the present embodiment, for example, in the present embodiment, the heating medium supply process, the heat treatment process, and the reheating medium generation and injection process described above require that the inside of the heat treatment chamber 1 be a predetermined heat treatment atmosphere F through the heating medium supply process. For this reason, the heating medium supply step must be performed first.
Then, after the predetermined heat treatment atmosphere F is reached, the heat treatment is performed by injecting the predetermined superheated steam SK having a volume expanded into the inlet side outside air shielding region S1 and the outlet side outside air shielding region S2 through the reheating medium generation and injection step. It is assumed that the heating medium filled in the region S3 is prevented from flowing out of the room and from the outside air entering the room.
After such a situation is prepared, the object to be processed is continuously transferred into the heat treatment chamber 1 through the heat treatment step, and a predetermined heat treatment is performed in the heat treatment region S3.

In the present embodiment, the above-described heating medium configuration is adopted in order to set the inside of the heat treatment chamber 1 to a predetermined heat treatment atmosphere F. However, the present invention is not limited to this, and is widely known, for example. It is also possible to employ superheated steam as a heating medium.
In this case, a large amount of superheated steam is sprayed from the plurality of spray nozzles arranged in the heat treatment chamber toward the object to be processed, and the surroundings of the object to be processed are brought to a superheated steam atmosphere. An appropriate reheating medium (regenerated superheated steam) is generated and adjusted so as to be injected into the inlet side outside air shielding area S1 and the outlet side outside air shielding area S2. In this case, the processing chamber heating mechanism 7 may or may not be provided in the heat processing chamber 1.

Claims (10)

An inlet opened on one end side and an outlet opened on the other end side are provided, an inlet-side outside air shielding area near the inlet, an outlet-side outside air shielding area near the outlet, the inlet-side outside air shielding area, and the outlet-side outside air shielding. A heat treatment chamber divided into a heat treatment region continuously disposed between the regions,
A heating medium supply step of heating the inside of the heat treatment region to a predetermined temperature or higher by a heating mechanism inside the treatment chamber, and injecting a heating medium into the heated heat treatment region to make the inside of the heat treatment region a heat treatment atmosphere When,
A heat treatment step of carrying and heat-treating the object to be treated in the heat treatment region ;
The heating portion of the heating atmosphere of the processing area the sucked to the heat treatment outside the area, after generating the reheated medium volume expansion by heating above a predetermined temperature, said volume expanded reheated medium the inlet side Reheating medium generation injection in which a high-temperature reheating medium is retained in the inlet side outside air shielding area and the outlet side outside air shielding area by continuously injecting into the outside air shielding area and the outlet side outside air shielding area, respectively. Process,
Reheating medium overflowing from each of the inlet side outside air shielding area and the outlet side outside air shielding area on the upstream side of the inlet side outside air shielding area and the downstream side of the outlet side outside air shielding area, and in the vicinity of the inlet and the vicinity of the outlet A heat treatment method characterized by comprising an outdoor suction step for preventing outside air from entering the heat treatment region by sucking outside air . The heating medium supply process
The inside of the heat treatment area is controlled at normal pressure and about 115 ° C.,
The water supplied from the water supply source at a rate of 0.7 gr / sec or more is boiled at a predetermined temperature and a predetermined pressure to produce a gas-liquid mixture composed of water vapor and hot water, and the gas-liquid mixture is subjected to a heat treatment region. A heating medium spray nozzle for spraying into the inside,
The heating medium spray nozzle is controlled to have an internal pressure of 0.19 MPa or more and a nozzle internal temperature of 120 ° C. or more.
Heat treatment filled with a heating medium in a state where superheated steam and high-temperature fine water droplets are mixed in the heat treatment region by injecting a gas-liquid mixture into the heat treatment region via the heating medium injection nozzle. Adjust to the atmosphere,
2. The heat treatment method according to claim 1, wherein the reheat medium is superheated steam that is generated by reheating the heat medium in the heat treatment region adjusted to the heat treatment atmosphere and volume-expanded. 3.   The heat treatment method according to claim 1, wherein the heating medium is continuously ejected during the heat treatment of the object to be treated. 4. The heat treatment method according to claim 1 , wherein the reheating medium is sprayed in an expanded manner toward the entrance-side outside air shielding area and the exit-side outside air shielding area. An inlet opened on one end side and an outlet opened on the other end side are provided , an inlet-side outside air shielding area near the inlet, an outlet-side outside air shielding area near the outlet, the inlet-side outside air shielding area, and the outlet-side outside air shielding. placed in a continuous heat treatment chamber which is divided into a heat treatment area are disposed with the heat treatment chamber of the heat treatment in the region between the region, the predetermined heat processing region is heated to a predetermined temperature or higher A processing chamber heating mechanism that adjusts to the heat treatment atmosphere of
A transport mechanism for transporting the processing object from the inlet toward the outlet;
A heating medium generating mechanism including a heating medium spray nozzle that sprays the heating medium into the heat treatment region of the heat treatment chamber;
A suction port provided in at least a part of the heat treatment region of the heat treatment chamber , a blowout port provided in the inlet-side outside air shielding region and the outlet-side outside air shielding region, and the suction port and the blowout port communicated with each other. A communication pipe, a suction fan that is provided at a predetermined location of the communication pipe and forcibly sucks out the heating medium sprayed into the heat treatment region from the suction port into the communication pipe, and a heating medium sucked out by the suction fan A heating section that generates a reheat medium that has undergone volume expansion by heating to a predetermined temperature or more in the communication pipe, and the generated reheat medium from the outlet to the inside of the inlet side outside air shielding area and inside the outlet side outside air shielding area A reheating medium generating / injecting mechanism including a reheating medium injecting unit that injects each of the
On the upstream side of the inlet side outside air shielding area and the downstream side of the outlet side outside air shielding area, the reheating medium overflows from the inlet side outside air shielding area and the outlet side outside air shielding area, and near the inlet and the outlet. Each has an outdoor suction section that sucks in some outside air,
The inlet-side outside air shielding area and the outlet-side outside air shielding area are formed of a reheating medium in which a high-temperature reheating medium tends to stay by being continuously ejected through the reheating medium ejection mechanism . A heat treatment apparatus that functions as an injection / retention area . The heat treatment region is provided with a treatment chamber heating mechanism, and is heated to about 115 ° C. at normal pressure and by the treatment chamber heating mechanism.
The heating medium generating mechanism includes a heating unit, a pipe line that is heated by the heating unit in communication with a water supply source, and a heating unit that is provided at a tip part of the pipe line and has a tip facing the heat treatment region . A medium injection nozzle, and the heating medium injection nozzle is controlled to have an internal pressure of 0.19 MPa or more and an internal temperature of 120 ° C. or more,
Producing a gas-liquid mixture consisting of water vapor and hot water in the pipeline by boiling water supplied at 0.7 g / sec or more into the pipeline at a predetermined temperature and pressure,
Heat treatment filled with a heating medium in a state where superheated steam and high-temperature fine water droplets are mixed in the heat treatment region by ejecting the gas-liquid mixture into the heat treatment region through the heating medium injection nozzle. Adjusted to the atmosphere,
Reheating medium, claims, characterized in that the heating medium heated in the area which is adjusted to the heat treatment atmosphere is a superheated water vapor volume is generated by reheating expanded by reheating medium generating ejection mechanism 5. The heat treatment apparatus according to 5 .   The heat treatment apparatus according to claim 5 or 6, wherein the heating medium is continuously ejected during the heat treatment of the object to be treated. The reheating medium injection section is provided between the suction fan outlet and the connection opening provided above the inlet side outside air shielding area, and the connection opening provided above the suction fan outlet and the outlet side outside air shielding area. It is formed and arranged in a down-tilt funnel shape between each part,
Reheating medium is sprayed in an expanded manner from the respective reheating medium spraying portions formed in the descending funnel shape toward the inside of the inlet side outside air shielding area and the inside of the outlet side outside air shielding area,
The boundary between the inlet side outside air shielding area and the heat treatment area and the boundary between the outlet side outside air shielding area and the heat treatment area are respectively injected into the inlet side outside air shielding area and the outlet side outside air shielding area. The heat treatment apparatus according to claim 5, further comprising a boundary wall for forming the heating medium in a region where the heating medium tends to stay. The outdoor suction section is continuously provided on the upstream side of the inlet side outside air shielding area and the downstream side of the outlet side outside air shielding area, respectively.
Including a box portion having a suction space opened toward the processing object mounting surface of the transport mechanism, and a suction fan communicating with the box portion;
  The suction operation of the suction fan forcibly sucks outside air near the processing object mounting surface of the transport mechanism, and the reheating medium is drawn out from the inlet side outside air shielding area and the outlet side outside air shielding area by negative pressure. The heat treatment apparatus according to claim 5, wherein the heat treatment apparatus is sucked into the suction space and discharged. The processing chamber heating mechanism is a coiled heating unit that is disposed in a pair at a distance wider than the width of the transport mechanism in a substantially central region in the transport direction within the heat treatment region,
Between the pair of coiled heating units, a heat treatment chamber stirring fan that stirs the heat treatment atmosphere in the heat treatment region so as to spread throughout the room,
Between the heat treatment chamber agitating fan and a pair of treatment chamber heating mechanisms arranged so as to sandwich the fan, an air flow that is agitated by moving on the conveyance mechanism when the fan is blown by the rotation operation of the fan. The heat treatment apparatus according to claim 5, further comprising a fan guard that is generated.

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