JPH0633553B2 - Web humidifier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a strip-shaped film, cloth,
Alternatively, the present invention relates to a composite, processed product (hereinafter referred to as a web) in a humidifier, and particularly to a steam injection nozzle.

[0002]

2. Description of the Related Art The applicant of the present invention has previously provided a moisturizing device for a web, which can uniformly moisturize the inside of the structure of the web and can accurately adjust the moisturizing amount. Kosho 56-57984).

That is, this apparatus is an apparatus for condensing and condensing steam into a traveling web to humidify it, and a chamber for holding a wet atmosphere formed of only steam and a temperature of a web provided in a preceding step of this chamber. And a cooling roll for preventing re-evaporation of water in the web, which is provided in a post-process of the chamber, and a transfer for moving the web to the regulation roll, the chamber and the cooling roll. It consists of means.

The chamber, which is the means for maintaining the wet atmosphere, includes a steam jet nozzle provided on one or both sides of the running web, a heating wall for preventing condensation of steam, and an air shutoff nozzle for preventing external air from entering. It has a steam trunk surrounded by, and its outer surface is insulated by an exhaust passage and a heat insulation wall.

In the apparatus having the above structure, the temperature of the web is adjusted in advance by the adjusting roll to a temperature lower than the temperature of the dew point in the wet atmosphere or the saturated vapor temperature (hereinafter, simply referred to as dew point temperature). , Passing this web in a chamber through a wet atmosphere formed of only steam with a dew point temperature or slightly above that, which involves heat exchange between the web and steam with a change in steam state By doing so, the entire inner surface of the web is uniformly condensed and humidified.

That is, this humidifier has a pressure of about 1 atm 100.
The principle of vapor condensation under the condition of ℃ is applied. The inside of the chamber is practically separated from the outside air by a steam jet seal nozzle installed at the entrance and exit of the web, and is constituted by a very small amount of air and steam particles. Humidification occurs when these vapor particles (average particle size 20 angstroms) come into contact with the web and release their latent heat and condense.

[0007]

When the web is introduced into the chamber, it may be necessary to curl both ears of the web or to adjust the moistening amount of the web. Therefore, the curl of the web is corrected and the amount of humidification is adjusted by providing a difference in the amount of steam supplied in the vertical direction of the web.

However, since it was not possible to provide a difference in the amount of steam supplied in the width direction of the web, the web cover
It was not possible to delicately correct the curl or finely adjust the amount of humidification in the width direction of the web.

[0009]

SUMMARY OF THE INVENTION Therefore, in view of the above problems, the present invention provides a humidifying device capable of finely correcting curls formed on a web and finely adjusting the amount of humidification in the width direction of the web. Is.

[0010]

According to a first aspect of the present invention, there is provided a moisturizing device for a web, which comprises an adjusting roll for adjusting the temperature of the web to a temperature lower than a dew point or a saturated vapor temperature in a wet atmosphere.
Hold in a wet atmosphere formed only with steam having a temperature slightly above the dew point or saturated steam temperature in the wet atmosphere,
A humidifying device comprising a chamber for introducing a web through an inlet, running in the wet atmosphere and leading out through an outlet, and a cooling roll for preventing re-evaporation of water in the web,
Inside the chamber, an injection nozzle for injecting steam having a temperature slightly higher than the dew point or the saturated steam temperature in a wet atmosphere onto one side or both sides of the web is provided near the inlet along the width direction of the web, A warming means for keeping the inside of the chamber at a temperature slightly higher than the dew point or the saturated steam temperature in the wet atmosphere is provided, and the injection nozzle is connected to a supply pipe for supplying steam, and an injection port of the steam to the web is provided. Has a roof-type steam amount adjusting plate that covers the injection port, and the steam amount adjusting plate is provided with a steam amount adjusting opening. A steam amount adjusting rod for adjusting the opening angle of the steam amount adjusting plate by moving is provided at a predetermined interval, and an adjusting device for vertically moving each steam amount adjusting rod is provided.

According to a second aspect of the present invention, there is provided a humidifying apparatus, wherein a regulating roll for adjusting the temperature of the web to a temperature lower than the dew point or the saturated vapor temperature in the wet atmosphere, and the regulating roller slightly lower than the dew point or the saturated vapor temperature in the wet atmosphere. A chamber that holds in a wet atmosphere formed only by steam having a temperature higher than the above, introduces the web through the inlet, runs in this wet atmosphere, and then leads out through the outlet, and cooling that prevents re-evaporation of water in the web. A humidifying device comprising a roll, wherein the inside of the chamber is
A dew point or saturation in a humid atmosphere is provided near the inlet along the width of the web by an injection nozzle that injects steam with a temperature slightly higher than the dew point or saturated steam temperature in a humid atmosphere onto one or both sides of the web. A heat retaining means for retaining the temperature in the chamber at a temperature slightly higher than the vapor temperature is provided, and the injection nozzle has a partition wall vertically dividing the interior of the injection nozzle into a first compartment and a second compartment.
The first compartment has a steam injection port to the web, the second compartment is connected to a supply pipe for supplying steam, and the partition wall has through holes at required intervals. Has a wedge for adjusting the amount of steam that changes by moving up and down,
It has an adjusting device for vertically moving each steam amount adjusting wedge.

A moistening device for a web according to claim 3 of the present invention is
An adjusting roll for adjusting the temperature of the web to a temperature lower than the dew point in the wet atmosphere or the saturated steam temperature, and a wet atmosphere formed only with steam having a temperature slightly higher than the dew point in the wet atmosphere or the saturated steam temperature. A humidification device comprising a chamber for holding and introducing a web through an inlet and running in the wet atmosphere to lead out through an outlet, and a cooling roll for preventing re-evaporation of moisture in the web, the chamber comprising: In the inside of the, a spray nozzle for spraying steam having a temperature slightly higher than the dew point in the wet atmosphere or the saturated steam temperature to one side or both sides of the web is provided near the inlet along the width direction of the web. Insulating means for keeping the inside of the chamber at a temperature slightly higher than the inside dew point or the saturated vapor temperature are provided, and the inside of the injection nozzle is separated by a partition wall. It is divided into a first compartment and a second compartment below, has a steam injection port to the web in the first compartment, and a supply pipe for supplying steam to the second compartment is connected to the partition wall. It has a through hole for each interval, and has a steam amount adjusting plate for changing the area covered by the opening of each through hole to change the opening area of the opening, It has an adjusting device for rotating the plate.

[0013]

[Operation] Adjust the web temperature in advance to a temperature lower than the dew point temperature with the adjustment roll.

A web adjusted to a temperature lower than the dew point temperature is introduced into the chamber through the inlet.

In the chamber, steam having a temperature slightly higher than the dew point temperature in the wet atmosphere is jetted from the jet nozzle to one side or both sides of the web along the width direction of the web,
The web is humidified by running it in an atmosphere at a temperature slightly above the dew point temperature.

The humidified web is led out of the chamber through the outlet.

Re-evaporation of web moisture is prevented by a cooling roll.

Then, the case where the spray nozzle of claim 1 is used in the humidifying device having the above-mentioned structure will be described.

The steam injection port is covered with a roof-type steam amount adjusting plate, and the steam amount adjusting plate is provided with a steam amount adjusting opening.

When it is desired to reduce the vapor amount of a part of the web in the width direction, the vapor amount adjusting rod in the vicinity of the web is moved by the adjusting device in the direction of pressing the injection port. This increases the opening angle of the steam amount adjusting plate and reduces the opening area of the steam amount adjusting opening.

Therefore, since the steam supplied from the supply pipe has a small opening area for the steam quantity adjusting opening,
The amount of steam injected from the injection port in the vicinity is small.

When it is desired to increase the amount of steam to be injected, the steam amount adjusting rod is moved in a direction opposite to the direction in which the injection port is pressed to reduce the opening angle of the steam amount adjusting plate. The smaller the opening angle, the larger the steam volume adjustment opening, and the larger the steam volume that exits here.

This makes it possible to change the amount of steam injected in the width direction of the injection nozzle at a required position in the width direction.

The case of using the injection nozzle of claim 2 will be described.

When it is desired to reduce the vapor amount of a part of the web in the width direction, a vapor amount adjusting wedge near the web is moved by an adjusting device to reduce the opening area of the through hole.

As a result, the amount of steam supplied from the second compartment to the first compartment is reduced, and the amount of steam injected from the injection port near the through hole is reduced.

When it is desired to increase the amount of steam to be injected, the opening area of the through hole is increased by the steam amount adjusting wedge to increase the amount of steam supplied from the second compartment to the first compartment. .

The case where the injection nozzle of claim 3 is used will be described.

When it is desired to reduce the vapor amount of a part of the web in the width direction, the vapor amount adjusting plate in the vicinity of the web is rotated by an adjusting device to reduce the opening area of the through hole.

As a result, the amount of steam supplied from the second compartment to the first compartment is reduced, and the amount of steam injected from the injection port is also reduced.

When it is desired to increase the amount of steam, the opening area of the through hole is increased by the plate for adjusting the amount of steam,
Increase the amount of steam flowing from the compartment to the first compartment.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 10 is a chamber which is the main body of the humidifier according to this embodiment. The chamber 10 is a means for maintaining an atmosphere formed only of steam, and is composed of an upper steam trunk 12 and a lower steam trunk 14. The upper and lower steam trunks 12 and 14 can be separated from each other in the vertical direction.
The web runs between 2 and 14.

Reference numeral 16 is an inlet for the web F provided on one side surface of the chamber 10.

Reference numeral 18 is an outlet for the web F provided on the other side surface of the chamber 10.

Reference numeral 20 is a heating chamber provided inside the upper steam trunk 12. The heating chamber 20 is surrounded by a sheet metal member, and from the inlet 16 side, the steam injection chamber 2
2. It is divided into a steam supply chamber 24 and a greenhouse 26.

Reference numeral 28 is a heating chamber provided inside the lower steam trunk 14. The heating chamber 28 is divided into a steam injection chamber 30, a steam supply chamber 32, and a greenhouse chamber 34 from the inlet 16 side.

Reference numeral 36 is an exhaust port provided on the side of the inlet 16 on the ceiling surface of the upper steam trunk 12.

Reference numeral 38 is an exhaust port provided on the side of the outlet port 18 on the ceiling surface of the upper steam trunk 12.

Reference numeral 40 is an exhaust port provided on the bottom surface of the lower steam trunk 14 on the inlet 16 side.

Reference numeral 42 is an exhaust port provided on the bottom surface of the lower steam trunk 14 on the outlet 18 side.

Reference numeral 44 is a supply pipe for supplying steam to the steam supply chamber 24 through the adjusting valve 46. The steam supplied from the supply pipe 44 passes through the regulating valve 46, so that the steam has a saturated steam temperature or a temperature slightly higher than the saturated steam temperature, for example, a temperature of 101 ° C. to 104 ° C.
Steam having a temperature of 1.033 kg / cm ² which is approximately the same as atmospheric pressure is supplied. The reason for supplying this steam is that the size of the steam particles is minimized, so that it is easily absorbed by the web F.

Reference numeral 48 is a supply pipe for supplying steam to the greenhouse 26. The steam supplied from the supply pipe supply pipe 48 is set to have a temperature slightly higher than 100 ° C. and an atmospheric pressure slightly higher than the atmospheric pressure through the adjusting valve 50.

Reference numeral 49 is a discharge pipe for discharging the vapor in the greenhouse 26 to the outside.

Reference numeral 52 is a supply pipe for supplying steam to the steam supply chamber 32 through the adjusting valve 54. The steam supplied is the same as the steam supplied from the supply pipe 44.

Reference numeral 56 designates a regulating valve 58 to the greenhouse 34.
Is a supply pipe for supplying steam through. The steam supplied to the supply pipe 56 is the same as the steam supplied from the supply pipe 48.

Reference numeral 59 is a discharge pipe for discharging the vapor in the greenhouse 34 to the outside.

Reference numeral 60 is an adjusting roller provided in the preceding step of the inlet 16 of the chamber 10. The adjusting roller 60 adjusts the temperature of the traveling web F to a temperature lower than the dew point temperature and introduces it into the chamber 10.

Reference numeral 62 is a cooling roll provided in the subsequent process of the outlet 18 of the chamber 10. The cooling roll 62 prevents re-evaporation of the moistened water to the traveling web F. That is, the moistened web is heated to a temperature near the dew point temperature near the outlet port 18, and if it is exposed to the atmosphere as it is, the moisture of the web evaporates and a loss of increased moisture occurs. Therefore, the web is contact-quenched immediately after humidification.

Next, details of the heating chamber 20 will be described.

As described above, the heating chamber 20 is composed of the steam injection chamber 20, the steam supply chamber 24, and the greenhouse 26.

A steam passage port 64 is provided between the partition walls of the steam injection chamber 22 and the steam supply chamber 24.

On the bottom surface 22a of the steam injection chamber 22, there is an elongated hole-shaped injection port 66 for injecting steam onto the traveling web F.
Is provided. In this embodiment, the injection port 66 has a long hole shape, but instead of this, a plurality of injection ports may be provided in a zigzag shape, or a plurality of injection ports may be provided in a straight line.

After entering the steam supply chamber 24, the steam supplied from the supply pipe 44 enters the steam injection chamber 22 through the steam passage port 64 and is injected into the web F from the injection port 66.

The greenhouse 26 is divided into an upper greenhouse 26a and a lower greenhouse 26b by a partition wall 68 made of sheet metal. The steam supplied from the supply pipe 48 is supplied to the lower greenhouse 26b so that the entire lower greenhouse 26b is kept at a temperature slightly higher than the ambient temperature of 100 ° C. The steam supplied from the supply pipe 48 is discharged from the discharge pipe 49.

Web F of steam injection chamber 22 and greenhouse 26
The distance relationship regarding the traveling direction of the
May be a part of the introduction side of the web F, and most of the other part is occupied by the greenhouse 26. Therefore, the web F introduced into the chamber 10 has a structure in which steam is injected in the vicinity of the introduction port 16 thereof, and thereafter almost passes through the greenhouse 26.

Further, the heating chamber 28 provided in the lower steam trunk 14 is also provided in a vertically symmetrical structure with respect to the heating chamber 20.
An injection port 70 from 0 is provided.

Next, a steam amount adjusting device 71 capable of adjusting the amount of steam supplied in the width direction of the web F at required intervals will be described with reference to FIGS. 2 and 3.

This steam amount adjusting device 71 gives a difference in the amount of steam supplied in the width direction of the web F, so that the web F
It is possible to finely adjust the curl and finely adjust the amount of humidification in the width direction. That is, when both ears of the web F are curled downward, the amount of steam from the injection port 66 located above the web F and near both ears is made larger than that in the central part,
Correct this curl delicately.

On the bottom surface 22a of the steam injection chamber 22, as described above, the elongated hole-shaped injection port 66 is provided. A metal vapor amount adjusting plate 72 is provided on the injection port 66 in the width direction of the web F. This steam adjustment plate 72
Has a roof shape, that is, a mountain-shaped cross section, and has adjustment surfaces 74 and 76 in the width direction of the web F.
The six are in contact with each other at the central portion 78.
Therefore, when the central portion 78 is pressed downward, the adjustment surface 7
The angle θ (the “opening angle” described in the claims) of 4 and 76 is widened.

A plurality of circular notches 80 are provided on the end faces of the adjusting surfaces 74 and 76 in the width direction of the web F at required intervals.

In the central portion 78, a plurality of adjusting rods 82 are provided so as to project in the width direction of the web F at required intervals. A female screw portion 83 is provided at the tip of the adjusting rod 82.

A regulating valve 84 is provided above the adjusting rods 82 and above the upper trunk chamber 12. A male screw portion 85 that is screwed into the female screw portion 83 is provided from the lower portion of the adjusting valve 84.

By rotating the adjusting valve 84, the adjusting rod 82 moves in the vertical direction, and the adjusting surfaces 74 and 76 move to the bottom surface 2.
It is pressed by 2a, and the angle θ with which it touches changes. When the angle θ changes, the contact area between the bottom surface 22a and the vapor amount adjusting plate 72 changes, and the opening area of the cutout 80 changes. Therefore, the amount of steam passing through the notch 80 changes.

That is, the adjusting valve 84 lowers the adjusting rod 82 downward and widens the contact angle θ only at the portion where the amount of steam is desired to be reduced in the width direction of the web F. Then, the opening area of the cutout 80 is reduced, and the amount of steam injected from the injection port 66 is decreased.

The steam ejection chamber 30 is also provided with a similar steam amount adjusting device 71.

The operating state of the humidifier having the above structure will be described.

The adjusting roll 60 allows the web F having an appropriate temperature to enter the chamber 10 through the inlet 16.

When the web F passes between the steam injection chambers 22 and 30, steam is jetted to both sides of the web F from the jet port 66 above the web F and the jet port 70 below. In this case, the vicinity of the steam injection chambers 22 and 30 of the chamber 10 has an atmosphere formed of only steam. Therefore, the vapor particles (average particle diameter 20 angstrom) come into contact with the web, release their latent heat and condense to humidify. This action stops when the web reaches the dew point temperature, the latent heat of vapor is no longer discharged. By the way, it was thought that it was necessary to constantly inject steam until the dew point temperature was reached, but in fact, it was found that if the steam was injected only in the vicinity of the introduction port 16, the dew point temperature would be reached in the vicinity of the discharge port 18. Therefore, in the present invention, steam is jetted to both sides or one side of the web F only in the vicinity of the inlet 16.

The web F that has passed between the steam injection chambers 22 and 30 passes between the greenhouses 26 and 34, and the humidified steam causes condensation, so that the front surface of the web F is uniformly humidified. .

The web F discharged from the outlet 18 passes through the cooling roll 62, and the vapor is prevented from being re-evaporated.

The vapor inside the chamber 10 is discharged from the exhaust ports 36, 38, 40 and 42, respectively. In this case, the heating pipe runs around the exhaust port 36 and the like so that water droplets do not get around it.

By the way, in the humidifier according to the present invention, the place where the steam is injected onto the web F is only in the vicinity of the inlet 16 and is the greenhouse 26 after that. This point is different from the conventional heater (Japanese Patent Publication No. 58-57984).

In the conventional humidifier, the steam to be sprayed was all sprayed while the web F was running in the humidifier chamber.

However, in the experiments of the present applicant, even if the steam is not always injected during the traveling of the chamber 10,
It was found that if the steam was injected near the inlet, most of it was humidified, and the same effect as the conventional humidifier could be obtained.

That is, after injecting steam near the inlet 16, the greenhouse 26 is heated by superheated steam slightly higher than 1 atm. Since there is a loss of heat in the greenhouse 26, practically, the same effect as supplying saturated steam of 100 ° C. over the entire area is obtained.

As a result, in this embodiment, only by injecting the steam near the inlet, it is not necessary to inject the steam over the entire traveling path of the chamber, unlike the conventional humidifier. for that reason,
The structure inside the chamber becomes very simple, and the size of the chamber 10 can be reduced. This point can be said to be the greatest feature of the present invention.

FIG. 4 shows a humidifier showing a second embodiment of the present invention.

The difference between the chamber 110 of the humidifier of the second embodiment and the chamber 10 of the first embodiment is that the outlet 1
The point is that the steam injection chambers 122 and 130 are provided near the position 8.

The reason why the vapor injection chambers 122 and 130 are provided is not the purpose of humidifying the web F, but the chamber 10
The inside of the chamber is prevented from entering air, and the chamber 10
It is for injecting vapor, which can be said to be a so-called blocking film, so that the inside of is composed of only vapor.

A supply pipe to which steam is supplied is connected to the steam injection chambers 122 and 130, and has a structure for injecting steam onto the front and back surfaces of the web F.

As a result, the atmosphere of the vapor inside the chamber 10 becomes more complete, and the performance of humidifying the web F is improved.

Next, a second embodiment of the steam amount adjusting device 171 in the steam injection chamber 22 will be described.

FIG. 5 is a vertical sectional view of the vapor amount adjusting device 171.

As shown in FIG. 5, the vapor injection chamber 22 is vertically partitioned by a partition wall 86, and the through hole 8 is formed in the partition wall 86.
8 is provided.

A wedge 90 which can penetrate the through hole 88 is provided. Then, the wedge 90 is made movable up and down by the adjusting valve 84, and the adjusting valve 92 is rotated, whereby the wedge 90 is moved.
Is moved up and down to adjust the amount of the opening area of the through hole 88.
The wedges 90 are provided at required intervals in the width direction of the web F, and the opening area of the through holes 88 may be reduced by the wedges 90 at locations where the amount of steam is small.

6 and 7 are a perspective view and a plan view showing a third embodiment of the vapor amount adjusting device 271.

This vapor amount adjusting device 271 forms an upper injection chamber and a lower injection chamber by vertically partitioning the vapor injection chamber 22 by a partition wall 186. further,
A partition wall 1 is formed in the lower jet chamber in the width direction of the web F at required intervals.
It divides into the small lower injection chamber 22b by 87.

The partition wall 186 has a small lower injection chamber 22.
A long hole-shaped through hole 188 is provided for each b.

A circular closing plate 190 is provided on the partition wall 186.
Is provided. The closing plate 190 can be rotated by an adjusting rod 182 protruding from an eccentric position.
Then, the opening area of the through hole 188 can be changed by rotating the closing plate 190 with the adjusting rod 182.

As a result, the amount of steam injected from the injection port 66 can be adjusted for each of the small lower injection chambers 22b.

The steam amount adjusting devices 71, 171, 27
All of the adjustment valves of 1 had a structure to rotate manually,
Instead of this, it may be rotated by a motor or the like. Further, a feedback mechanism may be configured with a sensor or the like for automation.

[0093]

As described above, according to the humidifying device for a web of the present invention, the amount of steam injected from the injection port in the injection nozzle can be adjusted in the width direction of the web, so that the curl of the web can be improved. Can be delicately corrected or the amount of humidification in the width direction of the web can be finely adjusted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a humidifier according to a first embodiment.

FIG. 2 is a vertical sectional view of a steam amount adjusting device.

FIG. 3 is a perspective view of a steam amount adjusting device.

FIG. 4 is a vertical sectional view of a humidifier according to a second embodiment.

FIG. 5 is a vertical cross-sectional view of a second embodiment of the vapor amount adjusting device.

FIG. 6 is a perspective view of a third embodiment of the vapor amount adjusting device.

FIG. 7 is a plan view of a third embodiment of the vapor amount adjusting device.

[Explanation of symbols]

 10 ... Humidifier chamber 16 ... Inlet port 18 ... Outlet port 20 ... Heating chamber 22 ... Steam injection chamber 24 ... Steam supply chamber 26 ... Greenhouse 28 ... Heating chamber 30 ... Steam injection chamber 32 ... Steam supply chamber 34 ... Greenhouse 44 ... Supply pipe 48 ... Supply pipe 52 ... Supply pipe 56 ... Supply pipe 60 ... Adjusting roll 62 ... Cooling roll 66 ... Injection port 70 ... Injection port 71 ... Steam amount adjusting device 72 ... Steam adjusting plate 78 ... Central part of steam adjusting plate 80 ... Notch 82 ... Adjusting rod 84 ... Adjusting valve

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F24F 6/00 Z 9140-3L

Claims (3)

[Claims] 1. A control roll for adjusting the temperature of the web to a temperature lower than the dew point or the saturated steam temperature in a wet atmosphere, and a steam having a temperature slightly higher than the dew point or the saturated steam temperature in the wet atmosphere. A humidifying device consisting of a chamber that holds the wet atmosphere, introduces the web from the inlet, runs in the wet atmosphere and leads from the outlet, and a cooling roll that prevents re-evaporation of water in the web. Then, inside the chamber, an injection nozzle for injecting steam having a temperature slightly higher than the dew point in the wet atmosphere or the saturated steam temperature to one side or both sides of the web is provided near the inlet along the width direction of the web. Insulating means is provided for keeping the inside of the chamber at a temperature slightly higher than the dew point in the wet atmosphere or the saturated steam temperature, and the injection nozzle is provided with a supply pipe for supplying steam. There are connected, has an injection port to the vapor of the web, has a steam amount adjusting plate of roof-shaped covering the injection port,
A steam amount adjusting plate is provided with an opening for adjusting the amount of steam, and a rod for adjusting the amount of steam adjusts the opening angle of the steam amount adjusting plate by projecting from the uppermost part of the steam amount adjusting plate and moving up and down. A moistening device for a web, wherein the moistening device is provided so as to project at a required interval and has an adjusting device for vertically moving each steam amount adjusting rod. 2. A control roll for adjusting the temperature of the web to a temperature lower than the dew point or the saturated steam temperature in the wet atmosphere, and a steam having a temperature slightly higher than the dew point or the saturated steam temperature in the wet atmosphere. A humidifying device consisting of a chamber that holds the wet atmosphere, introduces the web from the inlet, runs in the wet atmosphere and leads from the outlet, and a cooling roll that prevents re-evaporation of water in the web. Then, inside the chamber, an injection nozzle for injecting steam having a temperature slightly higher than the dew point in the wet atmosphere or the saturated steam temperature to one side or both sides of the web is provided near the inlet along the width direction of the web. A heat insulating means is provided for keeping the inside of the chamber at a temperature slightly higher than the dew point or the saturated vapor temperature in the wet atmosphere, and the injection nozzle is provided with an injection nozzle by a partition wall. The first compartment inside Le is vertically and second
It is partitioned into compartments, the first compartment has a steam injection port to the web, the second compartment is connected to a supply pipe for supplying steam, and the partition wall has through holes at required intervals. A humidifying device for a web, comprising a steam amount adjusting wedge for changing the opening area of each through hole up and down, and an adjusting device for vertically moving each steam amount adjusting wedge. 3. A control roll for adjusting the temperature of the web to a temperature lower than the dew point or the saturated steam temperature in the wet atmosphere, and a steam having a temperature slightly higher than the dew point or the saturated steam temperature in the wet atmosphere. A humidifying device consisting of a chamber that holds the wet atmosphere, introduces the web from the inlet, runs in the wet atmosphere and leads from the outlet, and a cooling roll that prevents re-evaporation of water in the web. Then, inside the chamber, an injection nozzle for injecting steam having a temperature slightly higher than the dew point in the wet atmosphere or the saturated steam temperature to one side or both sides of the web is provided near the inlet along the width direction of the web. A heat insulating means is provided for keeping the inside of the chamber at a temperature slightly higher than the dew point or the saturated vapor temperature in the wet atmosphere, and the injection nozzle is provided with an injection nozzle by a partition wall. The first compartment inside Le is vertically and second
It is partitioned into compartments, the first compartment has a steam injection port to the web, the second compartment is connected to a supply pipe for supplying steam, and the partition wall has through holes at required intervals. It has a steam amount adjusting plate for changing the area covered by the opening of each through hole to change the opening area of the opening, and an adjusting device for rotating each steam amount adjusting plate. A moistening device for a web characterized in that