JPS5857984B2 - Web humidification method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for humidifying a strip-shaped film, paper, cloth, or a composite thereof, a processed product, etc. (hereinafter referred to as a web), and an apparatus directly used in this method.

Conventional humidifiers that use humid air generally fill a large chamber through which the web slowly passes through with air at a constant humidity and leave it in the enclosure for a considerable period of time in order to uniformly humidify the chamber.

However, according to this method, the degree of increase in web temperature due to air convection within the chamber was large, so the amount of humidification was small considering the size of the device.

For this reason, it is necessary to repeat the same introduction procedure to increase the amount of humidification, or to install an extremely large chamber and perform the treatment for a long time, which has the drawback of being complicated and having extremely poor workability. Ta.

In addition, spray-type humidifiers that apply moisture directly to the web using a spray nozzle use static electricity to break up the moisture particles, but even so, water particles still penetrate into the web's structure. Since the water particles were too large to be wetted, the surface of the web was only partially wetted, and sufficient uniform wetting could not be achieved.

In view of the above-mentioned drawbacks, the present invention is an improvement on the above-mentioned drawbacks.
To provide a method and device for humidifying a web, which can uniformly humidify the inside of the web even if it has a dense structure, and can accurately adjust the amount of humidification. It is something.

The configuration of the present invention will be explained below according to the embodiment shown in the drawings.

In Figs. 1 to 3, 1 is the web to which Karo-humidification is applied, 2 is the humidifier main body which is a means for maintaining the atmosphere formed only by the humidifying medium, and 3a and 3b are the humidifier main body 2. The upper and lower steam trunks are made of sheet metal members in the shape of a box having empty chambers 4a and 4b, respectively, and are arranged in vertically symmetrical positions, and their opposing surfaces are recessed to form a condensation chamber 5. together with a condensation chamber 5 in the running direction of the web 1
0, an inlet 6 and an outlet lower are formed at a predetermined interval through which the web 1 can pass, and a large number of steam jet nozzles 8a and sb are provided on the upper and lower walls of the condensing chamber 5, and the inlet 6 and A slit-shaped air-blocking nozzle 9a is provided on the exit lower part,
9b, and projecting edges 10a on both sides in a direction orthogonal to the running direction of the web 1.

10b has a small side exhaust hole 11a as shown in FIG.

A large number of 11b are provided.

Vacant spaces 4a are formed along the wall plates of the condensation chamber 5, the inlet 6, and the upper and lower walls of the outlet lower.

4b includes a cutting edge heat tube 12a which is heated by suitable means.

12b are arranged in a meandering manner, and the steam trunk 3a
, 3b have a completely sealed double wall structure with a predetermined distance between the upper and lower outer portions of the walls 13a, 3b.
13b.

Reference numeral 14 denotes a heat insulating wall with a predetermined thickness, which is composed of an upper heat insulating wall 14a and a lower heat insulating wall 14b, which can be separated into upper and lower parts and have exhaust holes 15a and 15b, respectively. Open inlet 16a and outlet 16b
At the same time, the heat insulating wall 14 hermetically surrounds the steam trunks 3a and 3e at a constant interval, and an exhaust passage 17 is formed between them.

Reference numeral 18 denotes a plurality of air cylinders provided to separate the heat retaining wall 14 into upper and lower parts, the base side of which is attached to the lower heat retaining wall 14b, and the tip end of the rod 19 to the upper heat retaining wall 14a.

20a, 21a and 20b, 21b are the pipes 22a, 2
The pressure regulating valve 20a is installed in the middle of the pressure regulating valve 2b.
, 20b is a steam supply pipe 23a for the heat insulation wall that penetrates the heat insulation wall 14.

heating wall 13a of steam trunk 3a, 3b via 23b
, connected to 13b, and pressure regulating valve: 21a 521
b is connected to the empty chambers 4a, 4b of the steam trunks 3a, 3b via gallo humid steam supply pipes 24a, 24b penetrating the heat retaining wall 14 and the thermal walls 13a, 13b.

25 is a rotatable humidification amount adjustment roll which is a means for adjusting the temperature of the web 1. This roll is placed in the front stage of the humidifier main body 2, and rotates while heating the web 1 in contact with it by an appropriate means. It is designed to be cooled.

Reference numeral 26 denotes a rotatable quenching roll which is a means for preventing moisture evaporation of the web moistened in the humidifier main body 2. This is disposed in the downstream process of the humidifier main body 1, and is brought into contact with the web while rotating. The facing web 1 is rapidly cooled by appropriate means.

27 and 28 are guide rolls. When humidifying the web 1, the air cylinder 18 is driven to separate and open the heat retaining wall 14a upward, and then the guide roll 27
, the web 1 is mounted on the humidification amount adjusting roll 25, the quenching roll 26, and the guide roll 28 to form a steam trunk 3a.

3b into the condensing chamber 5, and one end thereof is attached to a take-up roll (not shown).

Then, the air cylinder 18 is driven again to seal the heat insulating wall 14 and the steam trunk 3 as shown in FIGS. 1 and 2.
The condensing chambers 5 of a and 3b are kept airtight.

After that, the power is turned on and the web 1 is made to run in the direction of the arrow shown in the figure by an appropriate means, and the piping 22a t 22
After reducing the pressure of the high temperature and high pressure steam sent by the pressure regulating valve 21a and 21b, the pressure regulating valve 21
a, 21b and steam supply pipes 23a, 23b to the thermal wall 13a.

13b and heats the Calo thermal walls 13a and 13b.

On the other hand, the steam sent to the pressure regulating valves 21a and 21b is further adjusted and reduced in pressure to lower its temperature, and then is transferred to the empty chamber 4a of the steam trunks 3a and 3b.

4b as a wetting medium, and the steam jet nozzles 8a, 8
The jet stream is slowly introduced into the condensing chamber 5 through b,
And a side exhaust small hole 11a.

The gas is discharged into the exhaust path 17 via 11b.

At the same time, a part of the steam in the empty chambers 4a and 4b is ejected as a steam flow from the air blocking nozzles 9a and 9b to the inlet 6 and outlet lower part of the condensing chamber 5, thereby separating the outside air and the atmosphere in the condensing chamber 5. It separates and blows away the air laminar flow on the surface of the web 1 to prevent outside air from entering the condensation chamber 5.

As a result, the humid atmosphere inside the condensing chamber 5 is changed to the empty chamber 4.
a, steam jet nozzle 8a from 4b;

Since steam is constantly replenished via 8b, the temperature at or slightly above the saturated steam temperature (e.g. 10
It is formed using only steam as a humidifying medium (1 to 104°C) and a very small amount of air, and the chamber pressure is maintained several millimeters of water column higher than atmospheric pressure, and the dew point is maintained at 99°C to 97°C.

In this state, the vapor particles in the condensation chamber 5 become ultrafine particles with a size of about 20 angstroms, which is smaller than the pores in the structure of the web 1.

The web 1 is then run in the direction of the arrow in FIG.
After adjusting the temperature in advance to a temperature lower than the dew point or saturated steam temperature in the humid atmosphere of the condensation chamber 5, the web 1 is introduced and passed through the condensation chamber 6 maintained in the above-mentioned humid atmosphere state. As mentioned above, the size of the vapor particles in the chamber is sufficiently smaller than the structure of the web 1, so the vapor particles penetrate not only the surface of the web 1 but also deeply into the structure, and generate latent heat by contact with the web 1. is released and condensed.

This process is continued until the temperature of the web 1 rises to the dew point temperature due to the release of latent heat from the steam.

Therefore, very uniform humidification moisture can be obtained to the inside of the web 1.

Once the temperature of the moistened web 1 reaches the dew point temperature, it passes through the condensation chamber 5 without being humidified or dehumidified.
Immediately after exiting the condensation chamber 5, in order to prevent re-evaporation, the liquid comes into contact with a cooling roll 26 to be rapidly cooled, and is sequentially wound up on a winding roll (not shown).

Therefore, once you adjust the humidification amount at the maximum processing speed,
The amount remains almost constant even when the device is running at low speed and decelerating.

In this way, the web 1 that runs sequentially is humidified.
The moisture content at the cutting edge can be defined by the difference between the dew point or saturated vapor temperature of the humid atmosphere in the condensing chamber 5 and the temperature of the web 1 before passing through the condensing chamber 50.

Therefore, by heating or cooling the humidification amount adjusting roll 25 by appropriate means and adjusting the temperature of the web 1 in contact with the roll 25, a desired amount of humidification can be obtained depending on the use of the web.

Incidentally, there is a vacant space 4a in the steam trunks 3a and 3b.

When steam is sent to 4b, heating wall 13a.

Since 13b is heated as described above, the vacant room 4a
, 4b is prevented from condensing, and wall plates such as the upper and lower walls surrounding the condensing chamber 5 are heated by the heating tube 12a.

12b, it is possible to prevent the steam in the condensing chamber 5 from condensing and causing water droplets to adhere to the upper and lower walls of the chamber.

Further, the steam ejected by the air blocking nozzles 9a and 9b, except for the steam that has entered the condensing chamber 5, is discharged to the exhaust passage 17, and the steam in the condensing chamber 5 is discharged through the side exhaust small hole 11a.

These steams are discharged into the exhaust passage 17 via the heat insulating wall 14 through the exhaust passage 11b, and then the steam is discharged through the exhaust passage 17 and into the upper and lower exhaust holes 1.
5a and 15b, and prevents the steam from flowing out through the inlet 16a and outlet 16b of the heat retaining wall 14.

Therefore, other than the above-mentioned fine vapor particles being condensed by contact with the web 1 introduced into the condensation chamber 5, the vapor does not condense and condense, and therefore, the web 1 has no unnecessary particles. Water droplets do not fall and adhere to the web 1, and very uniform moisture at the cutting edge can be obtained to the inside of the web 1.

Further, in the above embodiment, the steam jet nozzles were provided above and below the running web, but the present invention is not limited to this, and the steam jet nozzles may be provided only on one side of the running web. good.

As explained above, according to the present invention, since the ultrafine particle vapor has a strong condensing force, it is possible to uniformly humidify the web in the thickness direction and the surface, and the web has a dense structure. It can also humidify webs such as silicone paper and wax-coated paper, overcoming the drawbacks of conventional humidification methods using moist air and electrostatic force moisturization methods.

In addition, it is possible to increase the amount of Garo moisture and control the amount of moisture at the cutting edge to the desired amount.In particular, since the structure rapidly cools the humidified web, re-evaporation of the Garo moisture is prevented. can do.

In addition, the gallo wet time has been increased from 0.3 seconds to 1.5 seconds, and the entire device can be made more compact.Moreover, it is no longer necessary to pass the web through the chamber or process it for a long time, as was the case in the past. There is no need to apply it, and workability can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view thereof, and FIG. 3 is a perspective view thereof. 2...---Humidifier body, 5...Condensation chamber, 8
a, 8b...Steam jet nozzle, 9a,
9b...Air blocking nozzle, 13a, 13b...
...-Heating wall, 14...-Heating wall, 17...
...Exhaust path, 25...-7JO moisture adjustment roll, 26...Quiet cooling roll.

Claims (1)

[Scope of Claims] 1. In a method of humidifying a running web while it is running, the temperature of the web is adjusted in advance to a temperature lower than the dew point in a humid atmosphere or the saturated steam temperature, and then the saturated steam temperature or the The above-mentioned web is passed through a humid atmosphere formed only by a humid medium at a temperature slightly above the above temperature, and a mature exchange involving a change in the state of the humid medium is involved between the web and the humid medium, so that the web is uniformly distributed over the entire surface of the web. A method of humidifying a web characterized by applying humidification at the same time as condensation. 2 The amount of humidification applied to the web is determined by adjusting the temperature of the web before passing through the humid atmosphere with respect to the dew point or saturated vapor temperature of the humid atmosphere, and the web is brought to substantially the dew point or saturated vapor temperature. 2. A method of humidifying a web according to claim 1, wherein the web is left in a humid atmosphere until the web is left in a humid atmosphere and then rapidly cooled to prevent re-evaporation of the web. 3. In a device that humidifies a running web by condensing a humidifying medium, the temperature of the web is adjusted by a humid atmosphere holding means that maintains an atmosphere formed only by the humidifying medium, and a web provided in a process preceding this holding means. a cooling means for preventing re-evaporation of the web provided in a subsequent process of the holding means;
A web humidifying device comprising a web transport means for introducing the web into a humid atmosphere. 4. The moist atmosphere maintaining means is a condensing chamber surrounded by a steam jet nozzle provided on one or both sides of the running web, a heating wall to prevent condensation of the moist medium, and an air blocking nozzle to prevent the infiltration of outside air. 4. A web humidifying apparatus according to claim 3, characterized in that the web humidifying apparatus comprises a humidifier main body having a structure in which the outer surface thereof is insulated by an exhaust passage and a heat-retaining wall.