JP2016176661A - Firing furnace and coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit heat from being transmitted from a hot air supply part to a sealing part of a container during a firing process and concurrently improve the surface quality of a painted surface of a container inner surface.SOLUTION: A firing furnace includes: a body including a firing chamber for burning a resin material to a heat insulation container 5; a hot air supply part which supplies hot air to the heat insulation container 5 in the firing chamber; and a support jig 13 placed on a placement plate 12a in the firing chamber and supporting the heat insulation container 5. The support jig 13 includes at least one shelf board 13c between a sealing part of the heat insulation container 5 and the hot air supply part. The body has openings, which lead from an interior part to an exterior part of the firing chamber, at positions located closer to the sealing part side than the shelf board 13c.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a firing furnace and a coating method, and more particularly to a firing furnace and a coating method for coating the inside of a container having a vacuum double tube structure.

In general, a container having a vacuum double tube structure composed of an inner layer and an outer layer is known as a structure that can insulate the contents of the container from the outside air in order to prevent temperature changes due to the outside air temperature.
In the vacuum double tube structure, the space between the double tube composed of the inner layer and the outer layer is evacuated from the hole provided in the outer layer, and the hole in the outer layer is sealed with a sealing portion to keep the state close to vacuum. Thus, a high heat insulating effect can be obtained.
In addition, it is generally known that the inner surface of the container is coated with a resin material such as a fluororesin for the purpose of preventing adhesion of dirt to the inner surface of the container, improving heat retention, and improving the appearance. .
The coating process is roughly divided into a blasting process, a painting process, a drying process, and a baking process.
In particular, as a technique suitable for baking a resin material on the inner surface of an insulated container where heat is not easily transmitted to the inside, there is known a technique for drying and baking by forcibly heating the insulated container from the inner surface side with a nozzle as a heat source. (Patent Document 1).

Japanese Patent No. 3195209

However, although it is possible to suitably apply heat to the inner surface of the heat insulating container by the technique disclosed in Patent Document 1, it is difficult to apply uniform heat to the inner surface of the container. Hydrogen, etc.) may occur.
Further, wrinkles due to the fluororesin adhering to the nozzle as the heat source may occur. In this case, it becomes more difficult to uniformly apply heat without removing the wrinkles, resulting in a vicious circle. It was.

In order to uniformly apply heat to the container, it is conceivable to apply heat not from the inside of the container but from the outside of the container.
However, in this case, heat may be applied to the sealing portion that is provided in the vacuuming portion and is relatively heat-sensitive.
For this reason, in order to prevent deformation of the sealing portion and ensure a vacuum state, the temperature in the baking chamber for baking must be lowered to a temperature lower than the deformation temperature of the sealing portion, and the baking temperature is limited. It was to be done. In this case, the segregation in the crystal grains of the resin material cannot be sufficiently eliminated, and the coated surface of the inner surface of the container may become rough.

  Furthermore, when baking, it is necessary to blow hot air on the container in order to increase the temperature of the coated surface of the container, which is expensive to produce and the environmental load due to the energy consumed for hot air generation is a problem. It was.

This invention is made | formed in view of this problem, and it aims at making surface property of the coating surface of a container inner surface favorable, suppressing that a high heat | fever is added to the sealing part with low heat resistance. .
Another object of the present invention is to reduce the cost required to generate hot air to be added to the container and to reduce the environmental load.

  According to the firing furnace according to the present invention, the subject has a double structure having a vacuum between the inner layer and the outer layer, and the outer layer has a sealing portion that seals a hole for evacuation. A baking furnace used when coating the inner surface of a container with a resin paint, a main body having a baking chamber for baking a resin material on the container, and hot air supply for supplying hot air to the container in the baking chamber And a support jig that is mounted on a mounting plate in the baking chamber and supports the container, and the support jig is provided between the sealing part of the container and the hot air supply part. And the main body has an opening connected from the baking chamber to the outside of the baking chamber closer to the sealing portion than the partition wall.

  According to the above configuration, the opening connected from the baking chamber to the outside of the baking chamber is provided on the sealing portion side of the partition wall of the main body, and the support having the partition wall provided between the sealing portion of the container and the hot air supply unit By providing the jig in the firing furnace, the temperature of the sealing part can be controlled by touching the air outside the firing chamber while suppressing the transfer of heat from the hot air supply part to the sealing part of the container during firing of the resin paint. The rise is suppressed and thermal deformation of the sealing portion can be prevented, the temperature in the firing chamber above the partition can be increased, the degree of bonding between the raw material particles of the resin material on the inner surface of the container is increased, and the surface of the resin paint Properties can be improved.

Moreover, it is preferable that the mounting plate has a through hole connected to the opening.
According to the above configuration, by placing the container on the mounting plate having the through hole, the heat in the vicinity of the sealing portion can be smoothly discharged to the outside air side, and the temperature in the vicinity of the sealing portion is increased. It becomes possible to suppress.

In addition, the main body includes an internal duct in the vicinity of the baking chamber inside, and the baking furnace includes a return duct connecting the hot air supply unit and the internal duct, and an internal duct to the hot air supply unit. A circulating duct that circulates the hot air, and the hot air supply unit communicates the internal duct with the firing chamber, and supplies the hot air from the internal duct to the firing chamber when in an open state. It is preferable to have a supply end.
According to the said structure, the produced | generated hot air can be circulated through an internal duct, a return duct, and a circulation duct, Therefore The electric power for a hot air production | generation can be saved, and an environmental load can be reduced.

  Further, according to the coating method of the present invention, the subject has a double structure having a vacuum between the inner layer and the outer layer, and a sealing portion for sealing a hole for vacuuming is formed in the outer layer. A coating method for coating an inner surface of a container with a resin paint, a coating step of applying a resin material to the container, and a drying step of drying the application surface of the resin material of the container after the coating step; After performing the coating step and the drying step at least once, the baking step of baking the resin material on the container with hot air supplied from a hot air supply unit in a baking chamber of a baking furnace, The sealing portion and the hot air supply portion are separated from each other while the sealing portion of the container is exposed to the outside air through an opening connected from the baking chamber to the outside of the baking chamber. Supplying the hot air to the container from a supply unit, it is solved by.

  According to the above configuration, by separating the container sealing portion from the hot air supply portion, it is possible to prevent heat from being transmitted from the hot air supply portion to the container sealing portion during the firing step, while outside the firing chamber. By touching the sealing portion to the air, the temperature rise of the sealing portion can be suppressed and thermal deformation of the sealing portion can be prevented, and the temperature in the firing chamber above the position separated by the support jig can be reduced. The surface quality of the resin coating can be improved by increasing the bonding degree between the raw material particles of the resin material on the inner surface of the container.

Further, in the firing step, when the hot air is not blown into the container, the hot air may be circulated between the hot air supply unit and the main body of the firing furnace.
According to the said structure, the electric power for a hot air production | generation can be saved by circulating the produced | generated hot air, and an environmental load can be reduced.

According to the present invention, the surface property of the resin paint is excellent while suppressing the heat from being transmitted from the hot air supply unit to the sealing unit of the container during the baking process and preventing the sealing unit from being deformed. Can be.
Moreover, the heat in the vicinity of the sealing portion can be smoothly discharged to the outside air side, and the temperature rise in the vicinity of the sealing portion can be suppressed.
Further, by circulating the generated hot air, it is possible to save electric power for generating the hot air and reduce the environmental load.

It is a figure which shows the flow of the manufacturing method of the coating container which concerns on this embodiment. It is a typical front view of the baking furnace concerning this embodiment. It is a typical top view of a baking furnace. It is a typical right view of a baking furnace. It is a typical left view of a baking furnace. It is a lower side perspective view of an insulation container. It is a figure which shows the state which supported the heat insulation container with the support jig. It is a figure which shows the temperature change in the baking chamber at the time of not using a supporting jig. It is a figure which shows the temperature change in the baking chamber at the time of using a supporting jig. It is a figure which shows the temperature change of the heat insulation container at the time of using a supporting jig.

  Hereinafter, a firing furnace and a coating method according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings.

The coating method according to the present embodiment is a method of coating a synthetic resin paint such as fluororesin on the inner surface of a heat insulating container having a vacuum heat insulating double structure.
In particular, in the coating method according to the present embodiment, by using a holding jig in the firing step described later, the brazing material that is a sealing part for sealing the vacuum part is prevented from being exposed to hot air, The temperature deformation is prevented.

First, a series of manufacturing steps will be described with reference to FIG.
Here, FIG. 1 is a diagram showing a flow of a method for manufacturing a coating container according to the present embodiment.
As shown in FIG. 1, this manufacturing process is roughly divided into a coating process S1 and a baking process S3.

  The painting step S1 includes a blasting step S10 for hitting a blast material on the inner surface of the heat insulating container, an air blowing step S11 for removing the blasting material, an inner surface painting step S12, a preliminary drying step S13, and a main drying step S14.

The blasting step S10 is performed in order to make the resin paint easily adhere to the heat insulating container 5 having a double pipe structure composed of an inner layer and an outer layer, which will be described later in detail, and to remove dust and the like carbonized by heat treatment. Is a step of roughening the surface of the heat insulating container 5 by spraying.
Air blow process S11 is a process of removing the sand blast adhering to the heat insulation container 5 by blast process S10 by a wind pressure.

  In the present embodiment, the inner surface coating step S12 is a step of coating by spraying a fluororesin toward the inner surface of the heat insulating container 5. Thus, by coating with a fluororesin, it becomes difficult for dirt to adhere to the inner surface of the heat insulating container 5, improving the heat retaining property and further improving the appearance.

The preliminary drying step S13 is a step of drying the fluororesin coating material in the heat insulating container 5 by raising the temperature using a heating furnace (not shown).
The main drying step S14 is a step of completely drying the fluororesin paint in the heat insulating container 5 by raising the temperature using a drying furnace (not shown).

  After the above process, if the coating film is thinner than the predetermined film thickness (S2: No), the air blowing process S11 to the main drying process S14 are repeated again to form a coating film with the predetermined film thickness (S2: Yes). ), And moves to the baking step S3.

The baking step S3 includes a pre-heating step S30 and a main baking step S31.
The preliminary temperature raising step S30 is a step of raising the temperature of the heat insulating container 5 using a temperature raising furnace.
The main baking step S <b> 31 is a step of baking the fluororesin material on the heat insulating container 5 using the baking furnace 1.
After the main baking step S31, the coating step is finished.

Next, the firing furnace 1 used in the baking step S3 will be described in detail with reference to FIGS.
Here, FIG. 2 is a schematic front view of the firing furnace 1 according to the present embodiment, FIG. 3 is a schematic plan view of the firing furnace 1, and FIG. 4 is a schematic right side view of the firing furnace 1. FIG. 5 is a schematic left side view of the firing furnace 1.

  The firing furnace 1 includes a casing-shaped main body 1a having a firing chamber 10, a slat conveyor 2 that conveys the heat insulating container 5, a heater device 11a and a burner device 11c that generate hot air and supply the hot air to the firing chamber 10 side, It is mainly comprised from the blowing nozzle 11b and the blowing valve 11d which blow off the produced | generated hot air to the heat insulation container 5 in the baking chamber 10, and the support jig 13 which supports the heat insulation container 5. FIG.

  The slat conveyor 2 is a device for transporting the heat insulating container 5 to the inside and outside of the baking chamber 10, and a pair of conveyor chains 12 that are endless chains driven to rotate by the geared motor 20, and the pair of conveyor chains 12 to rotate. Along with this, the mounting plate 12a is a plurality of plate members that rotate. Particularly in this embodiment, the slat conveyor 2 is configured to rotate at about 300 mm / min.

The mounting plate 12 a is attached to both ends of the conveyor chain 12, and traverses the baking chamber 10 so that the mounted heat insulating container 5 passes through the baking chamber 10 described later by the rotation of the conveyor chain 12. Rotating movement including horizontal trajectory.
A plurality of through holes 12b are formed in the mounting plate 12a. Although details will be described later, since the heat insulating container 5 placed on the placing plate 12a is exposed to the air outside the firing furnace 1 through the opening 10a of the firing furnace 1, the temperature rise is suppressed by the through hole 12b. Is done.
Furthermore, the air in the firing furnace 1 is discharged out of the firing furnace 1 through the through hole 12b and the opening 10a of the firing furnace 1.

  The heater device 11a corresponds to a hot air supply unit according to the present invention, takes in outside air, heats it, and is attached to the inlet 10e formed on each side wall of the main body 1a of the firing furnace 1 and the inlet 10e. This is a device for sending hot air to the internal duct 10c in the firing furnace 1 through the return duct 10d. In the present embodiment, the heater device 11a includes a heater having a heater capacity of about 15 KW and a fan having a rated output of about 400 W.

The burner device 11c corresponds to a hot air supply unit according to the present invention that is different from the heater device 11a. The burner device 11c takes in outside air and heats it, and is attached to a plurality of inlets 19e formed on both side walls of the main body 1a and the inlet 19e. This is a device for sending hot air to the internal duct 19c in the main body 1a through the return duct 19d. In this embodiment, the burner device 11c is mainly composed of a burner with a rated output of about 233 KW that generates hot air by gas burning using natural gas, a fan with a rated output of about 0.75 W, and a blower with a rated output of about 0.4 KW. Has been.
In particular, in the present embodiment, the burner device 11c is configured to be able to blow out at a maximum temperature of 400 degrees, which is the same as that of the blowing nozzle 11b, from blowing valves 11d provided more than blowing nozzles 11b described later.

The blowout nozzle 11b corresponds to a supply end according to the present invention, is openable, communicates with the internal duct 10c above and the firing chamber 10 below, and is attached so as to protrude downward from the upper portion of the firing chamber 10. ing. The blowing nozzles 11b are provided on the inlet side of the main body 1a, and are arranged in four rows in the longitudinal direction of the main body 1a, which is the conveying direction by the slat conveyor 2, and four rows in the short direction of the main body 1a, which is a direction perpendicular to the conveying direction. A total of 16 are provided.
And the lower end of the blowing nozzle 11b is arrange | positioned in the position close | similar to the opening of the upper part of the heat insulation container 5 conveyed in the baking chamber 10. FIG.
The hot air supplied from the heater device 11a is blown from above toward the opening of the heat insulating container 5 in the baking chamber 10 when the blowing nozzle 11b is in the open state.

The blowout valve 11d corresponds to a supply end according to the present invention different from the blowout nozzle 11b, is openable, communicates with the upper internal duct 19c and the lower firing chamber 10 and is connected to the ceiling of the firing chamber 10. It is attached so that the discharge port faces the surface. The blow-off valves 11d are provided on the outlet side of the main body 1a, and have 16 rows in the longitudinal direction of the main body 1a, which is the conveyance direction by the slat conveyor 2, and two rows in the short direction of the main body 1a, which is a direction perpendicular to the conveyance direction. A total of 32 are provided.
The hot air supplied from the blowing valve 11d is blown from above toward the entire heat insulating container 5 in the baking chamber 10 when the blowing valve 11d is in the open state.
The hot air blown into the baking chamber 10 is discharged out of the main body 1a through a plurality of openings 10a formed on both side walls of the main body 1a.

Further, the firing furnace 1 is provided with a pipe-like circulation duct 10b connected to the internal duct 10c and the heater device 11a.
That is, when the blowout valve 11d is in the closed state, the hot air supplied from the heater device 11a does not flow out from the internal duct 10c to the firing chamber 10, and passes through the return duct 10d, the internal duct 10c, and the circulation duct 10b. It will circulate to the heater device 11a.

Similarly, the firing furnace 1 is provided with a pipe-like circulation duct 19b connected to the internal duct 19c and the burner device 11c.
That is, when the blowout valve 11d is in the closed state, the hot air supplied from the heater device 11a does not flow out from the internal duct 19c to the firing chamber 10, and passes through the return duct 19d, the internal duct 19c, and the circulation duct 19b. It will circulate to the burner apparatus 11c.
That is, the generated hot air is prevented from flowing out to the atmosphere, the temperature drop is suppressed, and is reused for generating new hot air. For this reason, energy consumption for generating hot air can be suppressed, and the generation cost can be reduced.

  Further, the firing furnace 1 is provided with a cooling fan 14 that cools the heat-insulated container 5 that has been baked and coated with hot air at the end of the firing chamber 10 in the rotational movement direction of the conveyor chain 12.

  Although the details will be described later, the support jig 13 is a jig that is used in the firing step and supports the heat insulating container 5. The support jig 13 is shown in a simplified manner in FIGS.

Then, the support jig 13 transported outward on the outlet side of the main body 1a is transported from the outlet side of the main body 1a to the inlet side and reused by a collection conveyor (not shown).
Moreover, the heat insulation container 5 cooled by the cooling fan 14 will be conveyed to a storage place, and a plurality of heat insulation containers 5 will be continuously and efficiently baked.
In addition, it is not restricted to what is baked continuously in this way, You may make it bake for every collective number by batch processing.

Next, the heat insulation container 5 and the support jig 13 that supports the heat insulation container 5 will be described with reference to FIGS.
Here, FIG. 6 is a lower perspective view of the heat insulating container 5, FIG. 7 is a view showing a state where the heat insulating container 5 is supported by the support jig 13, and FIG. 8 is a case where the support jig 13 is not used. FIG. 9 is a diagram showing the temperature change in the firing chamber 10, FIG. 9 is a diagram showing the temperature change in the firing chamber 10 when the support jig 13 is used, and FIG. 10 is the heat insulating container 5 when the support jig 13 is used. It is a figure which shows the temperature change of.
In particular, lower temperatures T1 and T1a shown in FIGS. 8 and 9 indicate temperatures of two temperature sensors provided on the lower side in the baking chamber 10, and upper temperatures T2 and T2a are upper temperatures in the baking chamber 10, respectively. The temperature of the two temperature sensors provided in is shown.
Further, the outer bottom temperature T3 shown in FIG. 10 is the temperature of the temperature sensor attached to the outer bottom of the heat insulating container 5 provided in the baking chamber 10 in the baking process, and the inner temperature T4 is the inner temperature of the heat insulating container 5. The temperature of the temperature sensor attached to the side surface, the inner bottom temperature T5 is the temperature of the temperature sensor attached to the inner bottom of the heat insulation container 5, and the upper edge temperature T6 is the temperature sensor attached to the upper edge of the heat insulation container 5. Indicates temperature.

  The upper side of the heat insulating container 5 is opened so that a liquid or the like can be accommodated therein. The heat insulating container 5 has a vacuum double structure so as to have a heat insulating structure. As shown in FIG. 6, the internal vacuum portion is formed by a brazing material 52 attached to the outer bottom which is the lower surface on the outer layer side of the container main body 51. It is sealed.

The brazing material 52 is deformed when heated to about 380 degrees or more.
In order to prevent this deformation, when the temperature of the baking chamber 10 is set lower than that temperature, the segregation in the crystal grains of the resin material cannot be sufficiently eliminated, and the coating surface of the inner surface of the container is rough. There was.
Therefore, the heat insulating container 5 is supported by the support jig 13 described in detail below, and the temperature rise in the vicinity of the brazing material 52 is limited by the shelf plate 13c.

  The support jig 13 is formed in a shelf shape, and as shown in FIG. 7, a pair of side plates 13a standing up and down on both sides in the width direction, and both ends fixed to the pair of side plates 13a, are provided in the lower stage. The shelf board 13c and the shelf board 13i provided above the shelf board 13c are mainly comprised.

The shelf board 13c corresponds to a partition wall according to the present invention, and both ends thereof are fixed to the side board 13a and attached in a horizontal direction. Four support holes 13f for supporting the heat insulating container 5 are formed in the shelf plate 13c along the longitudinal direction so as to penetrate in the vertical direction that is the thickness direction.
The shelf board 13i corresponds to a partition wall according to the present invention that is different from the shelf board 13c, and is attached to the side plate 13a in a horizontal direction with both ends fixed. Similarly, four support holes 13f that support the heat insulating container 5 are formed in the shelf board 13i in the vertical direction, which is the thickness direction, along the longitudinal direction.
Thus, the support jig 13 is configured to suitably support the heat insulating containers 5 having different sizes by providing a plurality of shelf plates 13c and 13i in the vertical direction.

Furthermore, a support plate 13g is placed on a part of the support holes 13f in each of the shelf plate 13c and the shelf plate 13i. The support plate 13g is formed with a support hole 13h penetrating in the vertical direction, which is the thickness direction, and the support hole 13h is formed with a smaller diameter than the support hole 13f.
With such a configuration, the support jig 13 is directly supported by the support hole 13f when the outer diameter of the heat insulating container 5 is large, and suitable for the outer diameter when the outer diameter of the heat insulating container 5 is small. It can support suitably using the support plate 13g which has the support hole 13h of a diameter.

  In each of the pair of side plates 13a, a pair of slits 13e is formed continuously in the vertical direction, which is the longitudinal direction of the side plate 13a, and the positioning plate 13j is fixed by a fastener 13k passing through the slit 13e.

  The positioning plate 13j is a plate that determines the vertical position of the shelf plate 13i, and is attached to the opposing side surfaces of the pair of side plates 13a so that the short direction of the side plate 13a coincides with the longitudinal direction of the positioning plate 13j. ing.

By fixing the positioning plate 13j at an arbitrary position of the vertically continuous slit 13e, the position of the shelf plate 13i can be arbitrarily set, and the heat insulating containers 5 having different heights are preferably supported. It becomes possible to do.
In particular, the shelf plate 13c and the shelf plate 13i of the support jig 13 can prevent the periphery of the brazing material 52 from being directly exposed to hot air blown from above.
For this reason, it becomes possible to suppress the temperature rise around the brazing material 52.
Furthermore, the shelf board 13c and the shelf board 13i separate the through-hole 12b and the upper part of the heat insulation container 5, and it suppresses that the heat inside the heat insulation container 5 flows out into outside air through the through-hole 12b. Can do.
For this reason, it becomes possible to perform suitably baking of the resin material inside the heat insulation container 5 at the stable high temperature.

  Thus, by using the support jig 13, the inner temperature T4, inner bottom temperature T5, and upper edge temperature T6 are about 360 degrees to about 380 degrees as shown in FIG. An increase in the temperature of the outer bottom temperature T3 that is below the baking chamber 10 and below the shelf 13c can be suppressed to about 180 degrees in the present embodiment. This temperature is a sufficient temperature at which the brazing material 52 is not deformed.

Further, when the support jig 13 is used, the shelf plate 13c is provided between the blowing nozzle 11b or the blowing valve 11d to which hot air is supplied and the through hole 12b connected to the outside of the firing furnace 1 having a relatively low temperature. Will be located.
For this reason, as shown in FIG. 9, when the support jig 13 is used, the lower temperature T1a and the upper temperature in the baking chamber 10 are compared with the case where the support jig 13 shown in FIG. 8 is not used. It is possible to stabilize the variation in temperature of each T2a by reducing it.

In the present embodiment, when the support jig 13 is not used, the lower temperature T1 and the upper temperature T2 vary by about 50 degrees in about 30 seconds as shown in FIG. In the case of using 13, the fluctuations in the lower temperature T1a and the upper temperature T2a can be suppressed to fluctuations of about 30 degrees in about 30 seconds as shown in FIG.
And since the temperature fluctuation of upper side temperature T2a is small, naturally the temperature fluctuation of inner side temperature T4, inner bottom temperature T5, and upper edge temperature T6 can be made small.
As described above, since the temperature fluctuation can be reduced while maintaining the inner temperature T4, inner bottom temperature T5 and upper edge temperature T6 high, segregation in the crystal grains of the resin material due to baking can be sufficiently eliminated. It became possible to smooth the painted surface of the inner surface.

  In addition, said embodiment is only an example for making an understanding of this invention easy, and does not limit this invention. That is, the shape, size, arrangement, and the like of the members according to this embodiment can be changed and improved without departing from the spirit of the present invention, and the present invention includes its equivalents. is there.

  For example, it is only necessary that the paint can be baked into the heat insulating container by the above process, and the position, number, size, etc. of the support jig itself, the shelf plate of the support jig, the through hole, etc., according to the production capacity, production conditions, etc. It is possible to set arbitrarily.

Moreover, in the said embodiment, a blowing nozzle or a blowing valve is provided as what blows hot air from the upper direction of a heat insulation container, and the mounting board which has a through-hole connected with the open air is provided in the downward direction, a blowing nozzle or a blowing valve and penetration It demonstrated as providing a support jig between holes.
This invention is not limited to such a form, What is necessary is just to be able to avoid that a brazing material is directly exposed to a hot air with a support jig.
For example, the hot air supply direction is from bottom to top, a net as a support jig is provided at the top of the firing chamber, and a heat insulating container suspended upside down is attached to the net, and a through-hole that leads to the outside air above the heat insulating container May be formed.
As described above, according to the configuration in which the heat insulating container is suspended, the paint falls from the container due to its own weight, so that the temperature of the brazing material is increased by the support jig while preventing the paint from being biased below the heat insulating container. It can suppress and can prevent brazing material from changing.

DESCRIPTION OF SYMBOLS 1 Firing furnace 1a Main body 2 Slat conveyor 5 Heat insulation container 10 Firing chamber 10a Opening 10b, 19b Circulation duct 10c, 19c Internal duct 10d, 19d Return duct 10e, 19e Inlet 11a Heater apparatus (hot air supply part)
11b Blowing nozzle (supply end)
11c Burner equipment (hot air supply part)
11d Blowout valve (supply end)
12 Conveyor chain 12a Mounting plate 12b Through hole 13 Support jig 13a Side plate 13c, 13i Shelf plate (partition wall)
13d Beam material 13e Slit 13f Support hole 13g Support plate 13h Support hole 13j Positioning plate 13k Fastener 14 Cooling fan 20 Geared motor 51 Container body 52 Brazing material (sealing part)
T1, T1a Lower temperature T2, T2a Upper temperature T3 Outer bottom temperature T4 Inner temperature T5 Inner bottom temperature T6 Upper edge temperature

Claims (5)

Used to coat the inner surface of a container having a sealing structure for sealing a hole for evacuating the inner layer with a resin paint, having a double structure having a vacuum between the inner layer and the outer layer. A firing furnace,
A main body provided with a baking chamber for baking the resin material to the container;
A hot air supply section for supplying hot air to the container in the firing chamber;
A support jig mounted on a mounting plate in the baking chamber and supporting the container,
The support jig has at least one partition wall between the sealing portion of the container and the hot air supply portion,
The main body has an opening connected to the outside of the firing chamber from the firing chamber on the sealing portion side of the partition.   The firing furnace according to claim 1, wherein the mounting plate has a through hole connected to the opening. The main body includes an internal duct in the vicinity of the baking chamber inside,
The firing furnace is
A return duct connecting the hot air supply section and the internal duct;
A circulation duct for circulating the hot air from the internal duct to the hot air supply unit,
The said hot air supply part has a supply end which connects the said internal duct and the said baking chamber, and supplies the said hot air from the said internal duct to the said baking chamber when it is an open state. Or the baking furnace of 2. A coating method of coating a resin paint on the inner surface of a container having a double structure having a vacuum between an inner layer and an outer layer, and having a sealing portion for sealing a hole for vacuuming in the outer layer,
A coating step of applying a resin material to the container;
After the painting step, a drying step of drying the application surface of the resin material of the container;
After performing the coating step and the drying step at least once, a baking step of baking the resin material on the container with hot air supplied from a hot air supply unit in a baking chamber of a baking furnace,
In the baking step, the hot air supply is performed with the sealing portion and the hot air supply portion being separated from each other while the sealing portion of the container is exposed to the outside air through an opening connected from the baking chamber to the outside of the baking chamber. A coating method, wherein the hot air is supplied from a section to the container.   5. The coating method according to claim 4, wherein, in the baking step, the hot air is circulated between the hot air supply unit and the inside of the main body of the baking furnace when the hot air is not blown into the container. .

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