JPH04343752A - Web humidifier and humidification - Google Patents

Abstract

PURPOSE:To provide the title humidifier and humidification capable of downsizing a chamber for web humidification along with reducing steam injection. CONSTITUTION:A heating chamber 20 inside a upper steam trunk 12 is enclosed with a sheet metal member and partitioned, from the side of an inlet 16, into a steam injection chamber 22, a steam feed chamber 24 and a humidification chamber 28. While, another heating chamber 28 within a lower steam trunk 14 is partitioned, from the side of the inlet 16, into a steam injection chamber 30, a steam feed chamber 32 and a humidification chamber 34.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is applicable to belt-shaped films, cloth,
The present invention also relates to a method of humidifying these composites, processed products, etc. (hereinafter referred to as webs), and a device directly used in this method.

0002

BACKGROUND OF THE INVENTION The present applicant has previously provided a web humidifying device that can uniformly humidify the inside of the web tissue and can accurately adjust the amount of humidification (particularly Publication No. 56-57984).

That is, this device is a device that humidifies a running web by condensing steam, and includes a chamber that maintains a humid atmosphere formed only by steam, and a chamber that maintains the temperature of the web in the preceding process of this chamber. an adjustment roll for adjusting the temperature of the web, a cooling roll for preventing re-evaporation of water in the web provided after the above-mentioned chamber, and a transfer for running the web between the adjustment roll, the chamber and the cooling roll. It consists of means and more.

[0004] The chamber, which is the moist atmosphere maintaining means, includes a steam jetting nozzle provided on one or both sides of the running web, a heating wall to prevent steam condensation, and an air blocking nozzle to prevent outside air from entering. It has a steam trunk surrounded by a steam trunk, and its outer surface is insulated with an exhaust passage and a heat-retaining wall.

[0005] In the apparatus having the above configuration, after the temperature of the web is adjusted in advance to a temperature lower than the dew point or saturated steam temperature in a humid atmosphere (hereinafter simply referred to as dew point temperature) by the adjusting roll, , the web is passed through a humid atmosphere formed only by steam at or slightly above the dew point temperature in a chamber, thereby involving a heat exchange between the web and the steam accompanied by a change in the state of the steam. This allows uniform condensation and humidification to occur all over the inside of the web.

[0006] In other words, this humidifier has a pressure of about 1 atm 100
It applies the principle of vapor condensation under ℃ conditions. The inside of the chamber is virtually separated from the outside air by a steam jet seal nozzle installed at the entrance and exit of the web, and consists of a very small amount of air and steam particles. Humidification occurs when these vapor particles (average particle size 20 angstroms) contact the web, release their latent heat, and condense.

[0007]

[Problems to be Solved by the Invention] In the humidifying device having the above structure, the entire chamber maintains a humid atmosphere, so the structure of the chamber becomes large.

Specifically, since the steam injection nozzle is provided over the entire web travel path in the chamber, the portion that sends steam to the steam injection nozzle and the wall surface of the steam injection nozzle, etc. are heated. There was a problem in that the steam trunk became large due to the heating means.

[0009] Furthermore, since steam injection nozzles are provided over the entire running path of the web in the chamber and steam is injected from these steam injection nozzles, there is a problem that the amount of steam to be injected is also large.

0010

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a humidifying device and a humidifying method that can reduce the size of a chamber for humidifying a web and reduce the amount of steam injected.

[0011]

[Means for Solving the Problems] Claim 1 of the present invention provides an adjustment roller for adjusting the temperature of the web to a temperature lower than the dew point temperature.
A chamber that maintains a humid atmosphere formed only by steam at a temperature slightly above the dew point temperature, and a chamber in which the web is introduced from an inlet, runs through this humid atmosphere, and is taken out from an outlet; Cooling rollers to prevent re-evaporation of
Inside the chamber, an injection nozzle that injects steam onto one or both sides of the web is installed along the width direction of the web near the inlet, and the humidifying device is a humidifier consisting of a A heat insulating means is provided to keep the inside of the chamber warm at a temperature exceeding the above temperature.

The humidifying method according to claim 2 of the present invention is a method of humidifying a running web while it is running, in which the temperature of the web is adjusted in advance to a temperature lower than the dew point temperature, and then the temperature of the web is adjusted to a temperature slightly higher than the dew point temperature. Steam, which is a humidifying medium at a high temperature, is injected onto one or both sides of the web along the width direction of the web, and then the web is run in an atmosphere at a temperature slightly above the dew point temperature to uniformly humidify the entire surface of the web. It is intended to provide

[0013]

[Operation] The temperature of the web is adjusted in advance to a temperature lower than the dew point temperature using an adjustment roll.

[0014] The web, whose temperature is adjusted to be lower than the dew point temperature, is introduced into the chamber through the inlet.

In the chamber, steam at a temperature slightly higher than the dew point temperature in the humid atmosphere is injected from an injection nozzle onto one or both sides of the web along the width direction of the web,
The web is humidified by running in an atmosphere at a temperature slightly above the dew point temperature.

[0016] The humidified web is led out of the chamber from the outlet.

[0017] Re-evaporation of water in the web is prevented by the cooling roll.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Reference numeral 10 denotes a chamber which is the main body of the humidifier according to this embodiment. This 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. These upper and lower steam trunks 12 and 14 are vertically separable, respectively, and the upper and lower steam trunks 1
The web runs between 2 and 14.

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

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

Reference numeral 20 is a heating chamber provided inside the upper steam trunk 12. This heating chamber 20 is surrounded by a sheet metal member, and from the side of the inlet 16, the steam injection chamber 2
2. It is partitioned into a steam supply room 24 and a heat preservation room 26.

Reference numeral 28 is a heating chamber provided inside the lower steam trunk 14. This heating chamber 28 is partitioned from the inlet 16 side into a steam injection chamber 30, a steam supply chamber 32, and an insulating chamber 34.

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

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

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

Reference numeral 42 denotes 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 that supplies steam to the steam supply chamber 24 via a regulating valve 46. The steam supplied from this supply pipe 44 passes through the regulating valve 46 to produce steam at or slightly above the saturated steam temperature, for example, at a temperature of 101°C to 104°C.
Steam is supplied at a temperature of 1.033 kg/cm2, which is approximately the same as atmospheric pressure. The reason for supplying this steam is that the size of the steam particles is minimized so that they are easily absorbed by the web F.

Reference numeral 48 denotes a heat insulating pipe that supplies steam to the insulating chamber 26. The steam supplied from the heat insulating pipe 48 passes through a regulating valve 50, and its temperature is set to be slightly higher than 100° C., and its pressure is set to a level slightly higher than atmospheric pressure.

Reference numeral 49 is a discharge pipe for discharging the steam inside the insulating chamber 26 to the outside.

Reference numeral 52 is a supply pipe that supplies steam to the steam supply chamber 32 through the regulating valve 54. This supplied steam is the same as the steam supplied from the supply pipe 44.

Reference numeral 56 indicates an adjustment valve 58 to the insulating chamber 34.
This is an insulated pipe that supplies steam through the pipe. This supplied steam is the same as the steam supplied from the heat insulation pipe 48.

Reference numeral 59 is a discharge pipe for discharging the steam inside the insulating room 34 to the outside.

Reference numeral 60 denotes an adjustment roller provided at the front end of the inlet 16 of the chamber 10. This adjustment roller 60 adjusts the temperature of the running web F to a temperature lower than the dew point temperature, and introduces the web F into the chamber 10.

Reference numeral 62 is a cooling roll provided after the outlet 18 of the chamber 10. This cooling roll 62 prevents the moisture that has been humidified into the running web F from re-evaporating. In other words, the temperature of the humidified web near the outlet 18 has been raised to near the dew point temperature, and if the web is exposed to the atmosphere as it is, the water in the web will evaporate, resulting in an increased loss of water. Contact quench by 62.

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

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

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

The bottom surface 22a of the steam injection chamber 22 is provided with an elongated injection port 66 for injecting steam onto the running web F.
is provided. In this embodiment, the injection ports 66 are elongated holes, but instead of this, a plurality of injection ports may be provided in a staggered pattern, or a plurality of injection ports may be provided in a straight line.

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

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

[0042] Web F between the steam injection chamber 22 and the insulating chamber 26
Regarding the distance relationship with respect to the traveling direction, the steam injection chamber 22 may be a part of the introduction side of the web F, and most of the other part is occupied by the insulating chamber 26. Therefore, the web F introduced into the chamber 10 is
The structure is such that the steam is injected in the vicinity of 6, and after that most of the steam passes through the insulating chamber 26.

Further, the heating chamber 28 provided in the lower steam trunk 14 is also provided in a vertically symmetrical structure with the heating chamber 20, and the steam injection chamber 3 is located directly below the ejection port 66.
An injection port 70 from 0 is provided.

Next, the steam amount adjusting device 71 that can adjust the amount of steam supplied in the width direction of the web F at required intervals will be explained based on FIGS. 2 and 3.

This steam amount adjusting device 71 provides a difference in the amount of steam supplied in the width direction of the web F.
It is possible to correct curls and adjust humidity in the width direction. In other words, when both ears of the web F are curled downward, the amount of steam injected from above the injection ports 66 near both ears to the web F is larger than that from the central part. This is to correct the problem.

The bottom surface 22a of the steam injection chamber 22 is provided with an elongated injection port 66, as described above. Above the injection port 66, a metal steam amount adjusting plate 72 is provided in the width direction of the web F. This steam adjustment plate 72 has a chevron-shaped cross section, and has an adjustment surface 7 in the width direction of the web F.
4, 76, and these adjustment surfaces 74, 76 abut each other at a central portion 78. Therefore, when this central portion 78 is pressed downward, the angle θ at which the adjustment surfaces 74 and 76 meet widens.

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

A plurality of adjustment rods 82 are protruded from the center portion 78 at required intervals in the width direction of the web F. A female screw portion 83 is provided at the tip of the adjustment rod 82 .

An adjustment valve 84 is provided above these adjustment rods 82 and above the upper trunk compartment 12. A male screw portion 85 is provided from the lower part of the regulating valve 84 and is screwed into the female screw portion 83 .

By rotating the adjustment valve 84, the adjustment rod 82 moves in the vertical direction, and the adjustment surfaces 74 and 76 align with the bottom surface 2.
When pressed by 2a, the angle θ of their contact changes. When this angle θ changes, the contact area between the bottom surface 22a and the steam amount adjusting plate 72 changes, and the opening area of the notch 80 changes. Therefore, the amount of steam passing through the notch 80 changes.

That is, in the width direction of the web F, the adjustment rod 82 is lowered downward by the adjustment valve 84 only at the portion where the amount of steam is desired to be reduced, and the angle θ of contact is widened. Then, the opening area of the notch 80 becomes smaller, and the amount of steam injected from the injection port 66 becomes smaller.

Further, the steam ejection chamber 30 is also equipped with a similar steam amount adjusting device 71.

[0053] The operating state of the humidifier having the above configuration will be explained.

The web F, which has been brought to an appropriate temperature by the adjusting roll 60, enters the chamber 10 through the inlet 16.

When the web F passes between the steam injection chambers 22 and 30, steam is injected onto both sides of the web F from the injection port 66 located above and the injection port 70 located below. In this case, the vicinity of the steam injection chambers 22 and 30 of the chamber 10 has an atmosphere formed only of steam. Therefore,
These vapor particles (average particle size 20 angstroms) come into contact with the web, release their latent heat, and condense to perform humidification. When the web reaches the dew point temperature, there is no place to release the latent heat of the steam, and humidification stops. By the way, in order for the web F to obtain maximum humidified moisture, the outlet port 1 must be
However, in the case of the present invention, simply by injecting steam near the inlet 16, the web F reaches the dew point temperature near the outlet 18. That is, after steam is injected near the inlet 16, the insulating chamber 26 is heated with superheated steam at a pressure slightly higher than 1 atm. Since there is heat loss in the main body 10, the insulating chamber 26, etc., in practical terms, the effect is the same as supplying 100° C. saturated steam throughout the entire area. Therefore, if steam is injected onto both sides of the web F only near the inlet 16, humidification can be achieved with the same performance as before.

[0056] As a result, this embodiment can be used in a conventional humidifier (Japanese Patent Publication No. 58-57) by simply injecting steam near the inlet.
No. 984), there is no need to inject steam over the entire travel path of the chamber. Therefore, the structure inside the chamber becomes very simple, and the size of the chamber 10 can also be reduced. Furthermore, the amount of steam to be injected can also be reduced. This point can be said to be the greatest feature of the present invention.

[0057] The web F coming out of the outlet 18 passes through a cooling roll 62, and re-evaporation of its vapor is prevented.

The steam inside the chamber 10 is exhausted from exhaust ports 36, 38, 40, and 42, respectively. In this case, a heating tube runs around the exhaust port 36 etc. to prevent water droplets from forming around it.

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 steam injection chambers 122, 130 are also provided near 8.

The reason for providing the steam injection chambers 122 and 130 is not to humidify the web F, but rather to
chamber 10 without allowing air to enter inside the chamber 10.
This is a so-called barrier film for injecting steam so that the inside of the tank is composed only of steam.

A supply pipe for supplying steam is connected to the steam injection chambers 122, 130, and the structure is such that the steam is injected onto the front and back surfaces of the web F.

[0063] As a result, the steam atmosphere inside the chamber 10 becomes more perfect, 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 longitudinal sectional view of the steam amount adjusting device 171.

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

A penetrable wedge 90 is provided in this through hole 88. The wedge 90 is made vertically movable by the adjusting valve 84, and by rotating the adjusting valve 92, the wedge 90
is moved up and down to adjust 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 in locations where a small amount of steam is required, the wedges 90 can be used to reduce the opening area of the through holes 88.

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

This steam amount adjusting device 271 forms an upper injection chamber and a lower injection chamber by vertically partitioning the steam injection chamber 22 by a partition wall 186. moreover,
The lower injection chamber is divided into partition walls 1 at required intervals in the width direction of the web F.
87 into a small lower injection chamber 22b.

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

[0071] On the partition wall 186 is a circular closing plate 190.
is provided. This closing plate 190 is rotatable by an adjustment rod 182 protruding from an eccentric position. Then, by rotating the closing plate 190 using the adjustment rod 182, the opening area of the through hole 188 can be changed.

[0072] Thereby, the amount of steam injected from the injection port 66 for each small lower injection chamber 22b can be adjusted.

[0073] Note that the steam amount adjusting devices 71, 171, 27
All adjustment valves in No. 1 were designed to be rotated manually, but
Alternatively, it may be rotated by a motor or the like. Furthermore, the feedback mechanism may be configured with sensors or the like to be automated.

[0074]

[Effects of the Invention] As described above, the web humidifying device and humidifying method of the present invention only injects steam near the inlet, and unlike conventional humidifiers, steam is injected over the entire running path of the chamber. There's no need to. Therefore, the structure inside the chamber becomes very simple, and the size of the chamber can also be reduced. Furthermore, the amount of steam to be injected can also be reduced.

[Brief explanation of drawings]

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

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

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

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

FIG. 5 is a longitudinal sectional view of a second embodiment of the steam amount adjusting device.

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

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

[Explanation of symbols]

10... Humidifier chamber 16...Introduction port 18... Outlet 20...Heating chamber 22...Steam injection chamber 24...Steam supply room 26... Warming room 28... Heating chamber 30...Steam injection chamber 32...Steam supply room 34... Warming room 44... Supply pipe 48……Heat insulation pipe 52... Supply pipe 56……Heat insulation pipe 60...adjustment roll 62...Cooling roll 66...Injection port 70...Injection port

Claims (2)

[Claims] Claim 1: An adjustment roll that adjusts the temperature of the web to a temperature lower than the dew point or saturated steam temperature in a humid atmosphere, and a web formed using only steam at a temperature slightly higher than the dew point or saturated steam temperature in the humid atmosphere. A humidifying device consisting of a chamber that maintains a moist atmosphere in which the web is introduced from an inlet, runs through this humid atmosphere, and is led out from an outlet, and a cooling roll that prevents re-evaporation of water in the web. Inside the chamber, there is a spray nozzle that sprays steam at a temperature slightly higher than the dew point or saturated steam temperature in a humid atmosphere onto one or both sides of the web, along the width direction of the web near the inlet. 1. A web humidifying device, comprising: a heat-retaining means for keeping the inside of the chamber at a temperature slightly higher than the dew point or saturated steam temperature in a humid atmosphere. [Claim 2] A method of humidifying a running web while it is running, wherein the temperature of the web is adjusted in advance to a temperature lower than the dew point or saturated steam temperature in a humid atmosphere, and then After spraying steam, a wetting medium, at a temperature slightly above the temperature, along the width direction of the web onto one or both sides of the web, the web is placed in an atmosphere at a temperature slightly above the dew point of the humid atmosphere or the saturated steam temperature. A method for humidifying a web, which is characterized by applying uniform humidification to the entire surface of the web by running a web.