JP2022097272A - Heat processing apparatus - Google Patents

Abstract

To provide a heat processing apparatus in which dew condensation is prevented on a surface of a traveling roll inside a heat processing chamber.SOLUTION: A heat processing apparatus comprises: multiple nozzles 20 that are disposed above a transport route of a web in a heat processing chamber 12 and blows out a hot blast to the web; a radiator 34 that cools air supplied from outside; a heater 40 that heats the air cooled in the radiator 34; a fan 38 that sends the air heated by the heater 40 to the multiple nozzles 20; and a control unit 62 that calculates an amount of saturated water vapor on a surface of a traveling roll 24, calculates an amount of water vapor in the hot blast blown out from the nozzles 20, and, when the amount of the water vapor in the hot blast is larger than the amount of the saturated water vapor on the surface of the traveling roll 24, increases a cooling capability of the radiator 34 and decreases the amount of the water vapor in the hot blast to dry the hot blast.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat treatment apparatus for heat treating a web.

A heat treatment device is used to apply a coating liquid to a long web such as a film, metal leaf, paper, or cloth, and then to dry the coating liquid or to widen the web by heat. .. This heat treatment device horizontally carries the web into a heat treatment chamber having heat insulating properties, blows hot air onto the web from a plurality of nozzles arranged above the carried web, and also blows hot air onto the web from a plurality of nozzles below the web. Traveling rolls are arranged, and these traveling rolls smoothly convey the web.

Japanese Unexamined Patent Publication No. 2013-254595

However, in the heat treatment apparatus as described above, dew condensation may occur on the surface of the traveling roll depending on the drying conditions of the web. The reason is that, for example, the solvent contained in the coating liquid is vaporized by heating, and the heat of vaporization at that time lowers the surface temperature of the traveling roll, and dew condensation occurs. When dew condensation occurs on the surface of the traveling roll in this way, there is a problem that rust is generated on the surface of the traveling roll and moisture adheres to the lower surface of the web, resulting in a defective web.

Therefore, in view of the above problems, it is an object of the present invention to provide a heat treatment apparatus in which dew condensation does not occur on the surface of a traveling roll in a heat treatment chamber.

The present invention has a heat treatment chamber having heat insulating properties, an inlet that opens in front of the heat treatment chamber and carries in a traveling web, and an outlet that opens in the rear surface of the heat treatment chamber and carries out the web. In the heat treatment chamber, a plurality of nozzles arranged above the transport path of the web and blowing hot air to the web, a plurality of traveling rolls arranged below the transport path for the web to travel, and a traveling roll supplied from the outside. A cooling unit that cools the air that has been noticed, a heater that heats the air cooled by the cooling unit, a blower that sends the air heated by the heater to the plurality of nozzles, and saturation of the surface of the traveling roll. The amount of water vapor is calculated, the amount of water vapor of the hot air blown from the nozzle is calculated, and when the amount of water vapor of the hot air is higher than the amount of saturated water vapor on the surface of the traveling roll, the cooling capacity by the cooling unit is increased. The heat treatment apparatus is characterized by having a control unit for reducing the amount of water vapor of the hot air and drying the hot air.

According to the present invention, the amount of saturated steam on the surface of the traveling roll is calculated, the amount of steam of hot air blown from the nozzle is calculated, and when the amount of steam of hot air is higher than the amount of saturated steam of the traveling roll, the traveling roll Since dew condensation may occur on the surface of the traveling roll, the cooling capacity of the cooling unit is increased to reduce the amount of steam of the hot air to dry the hot air and prevent dew condensation on the surface of the traveling roll.

It is explanatory drawing of the heat treatment apparatus which shows one Embodiment of this invention. It is a flowchart which shows the method of controlling the relative humidity in a heat treatment chamber in a heat treatment apparatus.

The web W heat treatment apparatus 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. The long web W to be heat-treated by the heat treatment apparatus 10 of the present embodiment is, for example, a film, a metal foil, paper, a cloth, or the like.

(1) Structure of the heat treatment apparatus 10 The structure of the heat treatment apparatus 10 will be described with reference to FIG. The heat treatment apparatus 10 has a heat treatment chamber 12 having a heat insulating property for heat-treating the web W. The heat treatment chamber 12 is a substantially rectangular parallelepiped, and the outlet 14 of the web W is opened on the front surface, and the inlet 16 of the web W is opened on the rear surface.

In the heat treatment chamber 12, a duct 18 extends in the front-rear direction above the horizontal transport path of the web W from the inlet 16 to the outlet 14. Nozzles 20 are arranged on the lower surface of the duct 18 at predetermined intervals in the front-rear direction. These nozzles 20 extend along the width direction of the web W, and a slit-shaped hot air outlet 22 is opened at the lower end along the width direction of the web W. Hot air is blown from the outlets 22 of the plurality of nozzles 20 to the web W traveling on the transport path.

Below the transport path, traveling rolls 24 are rotatably arranged from the inlet 16 to the outlet 14 at predetermined intervals. These traveling rolls 24 are driven synchronously so as to rotate at the same speed as the transport speed V of the traveling web W, and support the traveling web W while rotating. The traveling roll 24 is made of metal, and for example, the surface of iron or aluminum is chrome-plated.

Outside the heat treatment chamber 12, an air supply port 26 for supplying air from the outside air and a blower 28 for blowing the air supplied from the air supply port 26 to the HEPA filter 30 are provided. "HEPA filter (High Efficiency Particulate Air Filter) 30" uses a particle collection rate of 99.97% or more for particles with a rated air volume of 0.3 μm and an initial pressure loss of 245 Pa or less. Means an air filter with.

Outside the heat treatment chamber 12, one end of the first connecting pipe 32 is connected to the air outlet of the HEPA filter 30, and the radiator 34, which is a cooling unit, is connected to the other end of the first connecting pipe 32. The radiator 34 cools the air sent from the HEPA filter 30 to cause dew condensation and dry the supplied air. One end of the second connecting pipe 36 is connected to the outlet of the radiator 34, and the other end of the second connecting pipe 36 is connected to the inlet of the fan (blower) 38. A heater 40 that heats air to a predetermined temperature is connected to the outlet of the fan 38. The air heated by the heater 40 is sent to the duct 18 in the heat treatment chamber 12. The heated air sent to the duct 18 is blown out as hot air from the plurality of nozzles 20.

A chiller unit 42 and a regulating valve 46 are provided to control the cooling capacity of the radiator 34. The chiller unit 42 cools the water and supplies it to the radiator 34 as cooling water. Then, the cooling water that has cooled the radiator 34 returns to the chiller unit 42 and is drained. A water distribution pipe 44 through which cooling water flows is provided between the chiller unit 42 and the radiator 34, and a regulating valve 46 for adjusting the flow rate of the cooling water is provided in the middle of the water distribution pipe 44. By adjusting the adjusting valve 46, the flow rate of the cooling water sent to the radiator 34 is adjusted to control the cooling capacity of the radiator 34. That is, when the flow rate of the cooling water is reduced by the adjusting valve 46, the cooling capacity of the radiator 34 is lowered, and conversely, when the flow rate of the cooling water is increased, the cooling capacity of the radiator 34 is increased.

An exhaust port 56 is provided on the ceiling surface or the side surface near the outlet 14 of the heat treatment chamber 12, one end of an exhaust pipe 58 is connected to the exhaust port 56, and an exhaust blower is connected to the other end of the exhaust pipe 58. 60 is provided.

An outside air humidity sensor 48 for measuring the relative humidity of the outside air (hereinafter referred to as “outside air humidity”) Φout is provided in the vicinity of the air supply port 26.

The first connecting pipe 32 connecting the HEPA filter 30 and the radiator 34 is provided with a first temperature sensor 50 for measuring the first temperature T1, which is the temperature of the air flowing in the first connecting pipe 32.

The second connecting pipe 36 connecting the radiator 34 and the fan 38 of the heater 40 is provided with a second temperature sensor 52 that measures the second temperature T2, which is the temperature of the air cooled by the radiator 34.

The traveling roll 24 in the heat treatment chamber 12 closest to the inlet 16 is provided with a third temperature sensor 54 for measuring the third temperature T3, which is the surface temperature thereof. As the third temperature sensor 54, an infrared temperature sensor or the like that is not in contact with the rotating traveling roll 24 is used. The reason why the third temperature sensor 54 is provided on the traveling roll 24 closest to the inlet 16 is that the surface temperature of the traveling roll 24 closest to the inlet 16 is most likely to drop, and dew condensation occurs on the surface of the traveling roll 24. This is because it is easy.

The control unit 62 of the heat treatment apparatus 10 including a computer includes an air supply blower 28, a fan 38, a heater 40, a chiller unit 42, a regulating valve 46, an exhaust blower 60, an outside air humidity sensor 48, and a first temperature sensor 50. The second temperature sensor 52 and the third temperature sensor 54 are connected.

(2) Theoretical explanation of the method of preventing dew condensation from forming on the surface of the traveling roll 24 First, a method of preventing dew condensation from forming on the surface of the traveling roll 24 will be theoretically described.

(2-1) Outside air The outside air temperature, and the saturated water vapor amount a (T1) [g / m ³ ] of the outside air at the first temperature T1 [° C.], is

a (T1) = 217 * e (T1) / (T1 + 273.15) ... (1)

Will be. However, e (T1) [hPa] is the saturated water vapor pressure in the air, and e (T1) is approximately the same as August et al. According to the parameter value of Tetens (1930).

e (T1) = 6.1078 * 10 ^{{7.5 * T1 / (T1 + 237.3)}} ... (2)

It is calculated by. Assuming that the outside air humidity is Φout [% RH], the amount of water vapor M (T1) in the outside air is

M (T1) = Φout * a (T1) / 100 ... (3)

Will be.

(2-2) Air in radiator 34 Assuming that the temperature of the air cooled by the radiator 34 is the second temperature T2 [° C.], the saturated water vapor amount a (T2) [g / m ³ ] is

a (T2) = 217 * e (T2) / (T2 + 273.15) ... (4)

Will be. however,

e (T2) = 6.1078 * 10 ^{{7.5 * T2 / (T2 + 237.3)}} ... (5)

Is.

If M (T1)> a (T2), dew condensation occurs in the radiator 34. The amount of dew condensation ΔM at that time is

ΔM = M (T1) -a (T2) ... (6)

Is.

On the other hand, if M (T1) <= a (T2), no dew condensation has occurred on the radiator 34. The amount of dew condensation ΔM at that time is

ΔM = 0 ・ ・ ・ (7)

Is.

The amount of water vapor M (T2) in the cooled air after passing through the radiator 34 is

M (T2) = M (T1) -ΔM ... (8)

Will be.

Therefore, if dew condensation occurs on the radiator 34, substituting Eq. (6) into Eq. (8),

M (T2) = a (T2) ... (9)

Will be.

On the other hand, when no dew condensation has occurred on the radiator 34, ΔM = 0, so if equation (7) is substituted into equation (8),

M (T2) = M (T1) ... (10)

Will be.

(2-3) About the traveling roll 24 Assuming that the surface temperature measured by the traveling roll 24 is the third temperature T3, the saturated water vapor amount a (T3) [g / m ³ ] at the third temperature T3 [° C.] is

a (T3) = 217 * e (T3) / (T3 + 273.15) ... (11)

Will be. however,

e (T3) = 6.1078 * 10 ^{{7.5 * T3 / (T3 + 237.3)}} ... (12)

Is.

(2-4) Condensation on the surface of the traveling roll 24 When the regulating valve 46 is closed and cooling water is not flowing to the radiator 34 (cooling OFF), the amount of water vapor in the air after passing through the radiator 34 is that of the outside air. It is the same as the amount of water vapor in the air, and even if this air is heated by the heater 40 and sent to the duct 18 in the heat treatment chamber 12, the amount of water vapor does not change, and the water vapor of the hot air blown out from the plurality of nozzles 20. The amount remains M (T1). Therefore, regardless of whether or not dew condensation has occurred on the radiator 34,

a (T3) => M (T1) ... (13)

When the above is satisfied, the amount of water vapor M (T1) of the hot air is lower than the amount of saturated water vapor a (T3) of the traveling roll 24 and is sufficiently dry. Therefore, even if the outside air is heated as it is and blown out from the nozzle 20, No dew condensation occurs on the surface of the traveling roll 24.

However, when the equation (13) is not satisfied, the water vapor amount M (T1) of the hot air is higher than the saturated water vapor amount a (T3) of the traveling roll 24, so that the humidity is high and the outside air is heated as it is and blown out from the nozzle 20. Then, dew condensation occurs on the surface of the traveling roll 24. Therefore, at this time, the regulating valve 46 is opened, cooling water is flowed through the radiator 34 (cooling ON), the passing air is cooled, dew condensation is generated by the radiator 34, and the amount of water vapor of the passing air is M (cooling ON). Dry to T2). Even if this dry air is heated by the heater 40 and sent to the duct 18 in the heat treatment chamber 12, the amount of water vapor does not change, and the amount of water vapor of the hot air blown from the plurality of nozzles 20 is M (T2). There is up to. Then, when dew condensation is caused by the radiator 34, the water vapor amount M (T2) of the hot air dried from the equation (9) is equal to the saturated water vapor amount a (T2).

M (T2) = a (T2) <= a (T3) ... (14)

When this equation (14) is satisfied, since the water vapor amount M (T2) of the hot air is lower than the saturated water vapor amount a (T3) of the traveling roll 24 and is dried, dew condensation occurs on the surface of the traveling roll 24. do not do.

On the other hand, when the equation (14) is not satisfied, the moisture content of the dry hot air M (T2) is high and higher than the saturated water vapor content a (T3) of the traveling roll 24, so that dew condensation occurs on the surface of the traveling roll 24. Therefore, the regulating valve 46 is opened more to increase the flow rate of the cooling water to increase the cooling capacity of the radiator 34, lower the second temperature T2, and the amount of water vapor of hot air M (T2) = a (. T2) is low, i.e., drier. If the second temperature T2 is lowered and the hot air is continuously dried, the equation (14) will be satisfied someday, and dew condensation will not occur on the surface of the traveling roll 24.

(3) Control method for preventing dew condensation from occurring on the surface of the traveling roll 24 Next, the control unit 62 travels using the relational expression of whether or not dew condensation occurs on the surface of the traveling roll 24 shown above. A control method for preventing dew condensation from occurring on the surface of the roll 24 will be described with reference to the flowchart of FIG.

In step S1, the control unit 62 heats the inside of the heat treatment chamber 12. In this case, the air heated by the heater 40 is sent to the duct 18 by the fan 38, and hot air is blown out from the plurality of nozzles 20 to heat the inside of the heat treatment chamber 12 to a predetermined temperature. In the initial state, the adjusting valve 46 is closed (cooling OFF state) and no cooling water is flowing to the radiator 34. Then, the process proceeds to step S2.

In step S2, the web W is carried in from the inlet 16 at a predetermined transport speed V, and is carried out from the outlet 14. Then, the process proceeds to step S3.

In step S3, the control unit 62 measures the first temperature T1 with the first temperature sensor 50, the second temperature T2 with the second temperature sensor 52, and the third temperature T3 with the third temperature sensor 54. , The outside air humidity Φout is measured by the outside air humidity sensor 48. Then, the process proceeds to step S4.

In step S4, the control unit 62 calculates e (T1), a (T1), and M (T1) by the equations (1) to (3), and e (T2) and a (T2) are calculated by (4). It is calculated by the formulas (5) to (5), and e (T3) and a (T3) are calculated by the formulas (1) to (12). Then, the process proceeds to step S5.

In step S5, if a (T3) => M (T1) as shown by the equation (13), the control unit 62 does not cause dew condensation on the surface of the traveling roll 24 even if the outside air is allowed to flow as it is. Proceed to S6 (in the case of y). On the other hand, if a (T3) <M (T1), dew condensation will occur on the surface of the traveling roll 24 if the outside air is allowed to flow as it is, so that the process proceeds to step S7 (in the case of n).

In step S6, since dew condensation does not occur on the surface of the traveling roll 24, the control unit 62 stops cooling without flowing cooling water to the radiator 34 with the adjusting valve 46 closed (cooling OFF). Then, the process proceeds to step S10.

In step S7, since dew condensation occurs on the surface of the traveling roll 24, the control unit 62 opens the adjusting valve 46 and allows cooling water to flow to the radiator 34 (cooling ON). Then, the process proceeds to step S8.

In step S8, the control unit 62 determines whether or not the water vapor amount M (T2) of the hot air is lower than the saturated water vapor amount a (T3) of the traveling roll 24, as shown in the equation (14), and determines whether the hot air is lower than the saturated water vapor amount a (T3). When the steam amount M (T2) of the traveling roll 24 is lower than or the same as the saturated steam amount a (T3) of the traveling roll 24, the hot air is sufficiently dried and dew condensation does not occur on the surface of the traveling roll 24, so it is turned ON. The cooling capacity is maintained and the process proceeds to step S10 (in the case of y). When the water vapor amount M (T2) of the hot air is higher than the saturated water vapor amount a (T3) of the traveling roll 24, dew condensation occurs on the surface of the traveling roll 24 because the hot air is damp, and the process proceeds to step S9 (n. case).

In step S9, the control unit 62 increases the opening degree of the regulating valve 46 to increase the flow rate of the cooling water to increase the cooling capacity of the radiator 34, thereby lowering the second temperature T2 and reducing the water vapor amount M of the hot air. (T2) That is, a (T2) is lowered and dried, and the process returns to step S8. Then, if the equation (14) is satisfied, the hot air dries and no dew condensation occurs on the surface of the traveling roll 24, so that the cooling capacity is maintained and the process proceeds to step S10. If not satisfied, the hot air is still damp and the process proceeds to step S9 to further increase the flow rate of the cooling water to dry it. This control is continued until the equation (14) is satisfied.

In step S10, the control unit 62 ends this control if the delivery of the web is stopped, returns to step S3 one minute later if it is not stopped, and continues this control.

(4) Effect According to the present embodiment, dew condensation is less likely to occur on the surface of the traveling roll 24 in the heat treatment chamber 12, rust does not occur on the surface of the traveling roll 24, and the web W due to moisture is formed. Eliminate quality problems.

If dew condensation is likely to occur on the surface of the traveling roll 24, it can be easily controlled by adjusting the adjusting valve 46 to adjust the flow rate of the cooling water sent to the radiator 34 to increase the cooling capacity.

Further, the saturated water vapor amount a (T3) on the surface of the traveling roll 24 can be easily calculated only by measuring the surface temperature of the traveling roll 24.

Further, the water vapor amount M (T2) of the hot air, that is, a (T2) measures the outside air humidity Φout, the first temperature T1 of the supplied air, and the second temperature T2 of the air cooled by the radiator 34. It can be calculated easily just by.

Change example

In the above embodiment, a non-contact type infrared temperature sensor is used as a thermometer for measuring the surface temperature of the traveling roll 24, but the temperature is measured from a rotating body that contacts the surface of the traveling roll 24 and rotates together. It may be a temperature sensor.

In the above embodiment, when the amount of water vapor of the hot air is lower than the amount of saturated water vapor on the surface of the traveling roll 24, the cooling by the radiator 34 is stopped or maintained, but instead, the flow rate of the cooling water is reduced to reduce the cooling capacity. May be lowered.

In the above embodiment, the radiator 34, which is a cooling unit, is water-cooled by cooling water, but may be air-cooled, or may be a cooling device other than the radiator.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10 ... heat treatment device, 12 ... heat treatment chamber, 14 ... exit, 16 ... inlet, 18 ... duct, 20 ... nozzle, 24 ... running roll, 26 ... supply Air port, 34 ... radiator, 38 ... fan, 40 ... heater, 42 ... chiller unit, 46 ... adjustment valve, 48 ... outside air humidity sensor, 50 ... first temperature Sensor, 52 ... 2nd temperature sensor, 54 ... 3rd temperature sensor, 62 ... Control unit

Claims (10)

A heat treatment chamber with heat insulation and
An entrance that opens in front of the heat treatment chamber and allows the running web to be carried in.
An outlet that opens to the rear surface of the heat treatment chamber and where the web is carried out,
In the heat treatment chamber, a plurality of nozzles arranged above the transport path of the web and blowing hot air to the web,
A plurality of traveling rolls arranged for the web to travel below the transport path, and
A cooling unit that cools the air supplied from the outside,
A heater that heats the air cooled by the cooling unit, and
A blower that sends the air heated by the heater to the plurality of nozzles, and
The amount of saturated steam on the surface of the traveling roll is calculated, the amount of steam of the hot air blown from the nozzle is calculated, and when the amount of steam of the hot air is higher than the amount of saturated steam on the surface of the traveling roll, the said. A control unit that starts cooling by the cooling unit to reduce the amount of water vapor in the hot air to dry it.
A heat treatment apparatus characterized by having. An outside air humidity sensor that measures the outside air humidity Φout outside the heat treatment room,
A first temperature sensor that measures the first temperature T1 of the supplied air, and
Have,
The control unit
The first saturated water vapor amount a (T1) of the outside air was calculated from the first temperature T1.
From the outside air humidity Φout and the first saturated water vapor amount a (T1), the water vapor amount M (T1) of the outside air is calculated.
When the amount of water vapor M (T1) in the outside air is lower than the amount of saturated water vapor on the surface of the traveling roll, the cooling by the cooling unit is stopped.
The heat treatment apparatus according to claim 1. It has a second temperature sensor that measures the second temperature T2 of the air cooled by the cooling unit.
When the amount of water vapor M (T1) in the outside air is higher than the amount of saturated water vapor on the surface of the traveling roll, the control unit:
The second saturated water vapor amount a (T2) of the air passing through the cooling unit was calculated from the second temperature T2.
The amount of water vapor in the hot air is set to be the same as the amount of second saturated water vapor a (T2).
When the second saturated water vapor amount a (T2) is larger than the saturated water vapor amount on the surface of the traveling roll, cooling of the cooling unit is started.
The heat treatment apparatus according to claim 2. When the second saturated water vapor amount a (T2) is lower than the saturated water vapor amount on the surface of the traveling roll, the control unit maintains the cooling capacity of the cooling unit.
The heat treatment apparatus according to claim 3. It has a third temperature sensor that measures the third temperature T3, which is the surface temperature of the traveling roll.
The control unit calculates the saturated water vapor amount a (T3) on the surface of the traveling roll from the third temperature T3.
The heat treatment apparatus according to any one of claims 1 to 4. The cooling unit is a radiator that cools the air with cooling water.
The heat treatment apparatus according to any one of claims 1 to 5. Having a chiller unit, the chiller unit supplies the cooling water to the radiator.
The heat treatment apparatus according to claim 6. It has a regulating valve between the chiller unit and the radiator.
The control unit controls the flow rate of the cooling water flowing from the chiller unit to the radiator with the adjusting valve.
When the air from the outside air is dried, the flow rate of the cooling water is increased by the regulating valve to increase the dew condensation in the radiator.
The heat treatment apparatus according to claim 7. The traveling roll is made of metal and is made of metal.
Rotating in synchronization with the transport speed of the web,
The heat treatment apparatus according to any one of claims 1 to 8. The third temperature sensor is provided on the traveling roll closest to the inlet of the heat treatment chamber.
The heat treatment apparatus according to any one of claims 1 to 9.

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