JP4204065B2 - Steam injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam injection device for improving curl by spraying steam onto a paper sheet conveyed in a paper machine, and in particular, preventing and adhering to a paper sheet as water droplets. The present invention relates to a structure of a steam injection device capable of preventing steam from being scattered around.
[0002]
[Prior art]
In the final part of the paper machine, steam is sprayed on the transported paper sheet to give moisture so that the manufactured paper is not curled. As shown in FIG. 5, this process is performed by spraying steam 3 on the entire lower surface of the paper sheet by a steam spraying device 2 installed below the transported paper sheet 1. That is, steam is sprayed onto the lower surface of the paper sheet 1 to prevent moisture from being curled and the final paper sheet is curled, and the steam 3 can be sucked by the suction device 4 installed at the end in the conveying direction. It is configured.
[0003]
[Problems to be solved by the invention]
However, according to the steam injection device 2 described above, since the paper sheet 1 moves at a high speed, an air flow is generated below the paper sheet 1, and the steam 3 sprayed on the lower surface of the paper sheet 1 follows the air flow. The phenomenon of moving. And there existed a problem that a part of vapor | steam adhered to the lower surface of the paper sheet 1 as an excess water droplet, and had a bad influence on paper quality.
[0004]
In addition, a suction device 4 that sucks steam is provided on the conveyance direction side of the paper sheet 1, but since the flow of the steam is fast, all the steam sprayed on the lower surface of the paper sheet 1 is sucked by the suction device 4. However, if the liquid leaks to the outside and adheres to peripheral devices such as a transport roller as condensation, and drops on the paper sheet, the quality of the paper sheet is deteriorated.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a structure capable of improving the quality of a paper sheet in a steam injection apparatus used in a paper machine.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that the steam injector includes the following configuration.
Steam injection means. This steam injection means jets steam to the lower surface of the conveyed sheet.
Suction means. This suction unit is mounted on the transport destination direction side and / or the transport source direction side with respect to the vapor jet unit, and sucks the steam reflected by the lower surface of the sheet.
Wall body. The wall body is formed so as to protrude from the upper surface at a position on the transport destination direction side with respect to the suction means.
Air injection means. This air injection means is mounted on the outside of the wall on the conveyance destination direction side and injects air to the sheet lower surface side.
And the air injection direction by the said air injection means is set to the direction inclined in the conveyance origin direction.
[0007]
According to a second aspect of the present invention, there is provided the vapor injection device according to the first aspect, wherein a wall body is provided at a position on the conveyance source direction side with respect to the vapor injection means, and the vapor injection means and the suction means are sandwiched between a pair of wall bodies. It is characterized by that.
[0008]
According to a third aspect of the present invention, there is provided the steam injection device according to the second aspect, further comprising an air injection means for injecting air toward the conveyance destination direction on the lower surface of the sheet outside the wall body on the conveyance source direction side. .
[0009]
The steam injection device according to claim 4 is characterized in that, in claim 1 or claim 3, the upper part of the wall is bent inside the steam injection device.
[0010]
According to a fifth aspect of the present invention, in the fourth aspect, the air injection direction by the air injection means is a direction toward the upper portion of the bent wall body.
[0011]
According to a sixth aspect of the present invention, there is provided the vapor jet apparatus according to any one of the first to fifth aspects, wherein suction pipes for sucking floating vapor are provided at both ends in the width direction of the conveyed sheet.
[0012]
According to the vapor jet apparatus of the present invention, the air jetting unit that is attached to the outside of the wall body on the transport destination direction side and jets air to the lower surface side of the paper sheet is provided. In addition to preventing excessive adhesion of steam, the air is jetted so as to oppose the flow of steam moving along the paper sheet being transported. It can return to a direction and it can prevent that a vapor | steam leaks outside from the conveyance destination direction side.
[0013]
In addition, by providing a wall body at a position on the transport source direction side with respect to the steam injection means and sandwiching the steam injection means and the suction means between the pair of wall bodies, the steam is confined between the wall bodies and transported. It is possible to prevent leakage from the original direction side to the outside.
Furthermore, by providing the air injection means also on the side of the conveyance source, it is possible to reliably prevent the leakage of steam.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An example of an embodiment of a steam injection device according to the present invention will be described with reference to FIGS. 1 and 2.
The steam injection device 10 is installed in the final part of the paper machine, and a steam supply device 13 is provided in a steam chamber 12 defined in a main body 11 having a length in the width direction substantially equal to the width of the paper sheet 1. It is installed. The steam supply unit 13 is formed in a cylindrical shape along the width direction, and is supplied with heating steam from an external heating steam generation unit 15 through a pipe 14 and has a pair of discharge ports 16 and 16 provided on the lower surface. Heated steam is discharged from.
[0015]
The upper surface of the steam chamber 12 is provided with an injection port 17 along the width direction, and is configured to inject heated steam 18 filling the interior of the steam chamber 12. The ejection port 17 is formed to be inclined toward the conveyance source direction side of the paper sheet 1. Therefore, the heating steam 18 ejected from the ejection port 17 of the steam ejecting apparatus 10 hits the lower surface of the conveyed paper sheet 1 over the entire width direction, and can impart moisture to the paper sheet 1. In addition, a discharge port 19 is formed on the bottom surface of the vapor chamber 12 to discharge the vapor that has been liquefied and accumulated on the lower surface, and is configured to be discharged to the outside through the pipe 20.
[0016]
At the transport destination direction end and the transport source direction end of the steam injection device 10, suction devices 21 and 21 for sucking surplus heating steam that is reflected by the lower surface of the paper sheet and floats between the paper sheet 1 and the upper surface of the steam injection device. Are installed. Each suction device 21 has a large number of holes 22 formed on the upper surface so as to face the paper sheet 1, and is connected to a suction fan 24 installed outside via a pipe 23. Then, excess heating steam is discharged to the outdoors by the action of the suction fan 24.
[0017]
A wall body 31 is formed at the end of the suction device 21 on the transport destination direction side in the paper sheet transport destination direction so as to protrude from the upper surface position of the steam injection device 10. The wall body 31 is formed of an elongated plate piece so as to be continuous in the width direction (paper sheet width direction) of the steam injection device 10, and the wall body upper portion 31a is bent in the transport source (steam device inner side) direction. Has been. Further, the wall body 31 is set to such a height that a gap is formed between the top portion and the lower surface of the paper sheet 1.
[0018]
Similar to the wall body 31, a wall body 41 that protrudes from the top surface position is formed at the end of the suction device 21 on the transport direction side. The wall body 41 is configured by an elongated plate piece so as to be continuous in the width direction (paper sheet width direction) of the steam injection device 10. Further, the wall upper portion 41a of the wall body 41 is bent in the direction of the conveyance destination (inner side of the steam device).
Accordingly, the pair of wall bodies 31 and 41 are configured such that the injection port 17 and the suction devices 21 and 21 of the vapor injection device 10 are sandwiched.
[0019]
Air jetting devices 51 and 51 are mounted on the outer side of the wall body 31 located at the paper sheet transport destination direction end and the wall body 41 located at the paper sheet transport source direction end, respectively. These air injection devices 51 are installed on a support plate 52 mounted on the outside of the wall body 31 or the wall body 41, and inject air 53 on the lower surface side of the paper sheet 1.
[0020]
And the injection direction of the air injection apparatus 51 is set so that the injection direction of air may incline inside a steam injection apparatus by forming toward the bent wall upper parts 31a and 41a. That is, air is ejected from the air injection device 51 installed on the conveyance destination direction side toward the conveyance source direction, and air is ejected from the air injection device 51 installed on the conveyance source direction side toward the conveyance destination direction. Is done.
[0021]
With the above configuration, the air 53 is jetted from the air jet device 51 toward the wall upper portions 31a and 41a, so that an air curtain can be formed on the extension of the wall upper portions 31a and 41a and jetted from the jet port 17. It becomes possible to confine steam.
[0022]
Further, in order to prevent the temperature of the heated steam filled in the steam chamber 12 from being lowered, the steam supply pipes elongated in the width direction in the upper chambers 25 and 25 located above the steam chamber 12 and the lower chamber 26 located below. 61 is arrange | positioned and it is comprised so that heating steam may be supplied in the upper chamber 25 and the lower chamber 26 from the heating steam generator 28 via the piping 27. FIG.
In addition, each upper chamber 25 and lower chamber 26 are provided with collecting pipes 62, 62, 62 for discharging steam when liquefied, and configured to be discharged to the outside through the pipe 63. Has been.
[0023]
Then, the effect | action of the steam injection apparatus mentioned above is demonstrated.
Since the paper sheet 1 is conveyed above the steam injection device 10, the lower surface side of the paper sheet is exposed to the heated steam 18 ejected from the ejection port 17. The ejected heated steam 18 hits the lower surface of the paper sheet, and then flows in the transport destination direction along the movement of the paper sheet 1, and a part thereof is sucked from the hole 22 of the suction device 21.
[0024]
Since the air injection device 51 is provided at the end in the conveyance destination direction, the air is injected along the upper portion of the wall body 31 in the direction of the conveyance source. As a result, the air is jetted to the lower surface of the paper sheet to prevent the vapor from adhering, and the air is jetted so as to oppose the flow of steam moving along the paper sheet 1 being conveyed. In combination with the installation of the steam 31, the steam can be returned to the transport source direction.
[0025]
In addition, by returning the heated steam to the conveyance source direction, it is possible to lengthen the time during which the lower surface of the paper sheet is in contact with the steam, and to impart sufficient moisture to the paper sheet 1.
[0026]
About the vapor | steam returned in the conveyance origin direction, since the air injects in the conveyance destination direction from the air injection apparatus 21 along the upper part of the wall body 41 installed in the other end side, it is floating. It is possible to return the steam to the transport destination direction, and reliably prevent leakage from the upper surface of the steam device.
[0027]
In the above example, the walls 31 and 41 are formed on both sides of the vapor jet apparatus 10 in the conveyance direction of the paper sheet 1, but as shown in FIG. By forming 72, it is possible to prevent the heated steam from leaking out from the side of the upper surface of the steam injection device 10.
[0028]
FIG. 4 shows another example of the configuration of the steam injection device, in which suction means for sucking steam is also provided at a lateral position in the width direction of the paper sheet 1. In FIG. 4, parts having the same configuration as in FIG.
In other words, the vapor injection device has support pieces 81 and 81 fixed to both sides of the device located on the side of the conveyance sheet, and a cylindrical suction pipe 82 arranged along the conveyance direction is fixed to the support piece 81. Has been. The suction pipe 82 is formed with a large number of holes 83 for sucking floating vapor on the paper sheet side, and an end portion connected to a suction fan (not shown). According to this example, it is possible to reliably prevent vapor leakage from the side of the apparatus.
[0029]
Also, as shown in FIG. 4B, an air injection device 91 is installed above the suction pipe 82 and installed so that air from the air injection apparatus 91 is jetted downward on the upper side of the suction pipe 82. As a result, the floating steam is pushed back, and the leakage of steam from the upper surface of the injection device 10 can be reliably prevented.
[0030]
【The invention's effect】
According to the vapor jet apparatus of the present invention, the air jetting unit that is attached to the outside of the wall body on the transport destination direction side and jets air to the lower surface side of the paper sheet is provided. This prevents the excessive vapor from adhering to the paper sheet, thereby preventing excessive vapor from adhering to the paper sheet and preventing the dew from adhering to the paper sheet, thereby obtaining a high-quality paper sheet.
[0031]
Further, since the air is jetted so as to oppose the flow of steam moving along the paper sheet to be transported, the steam can be returned to the transport source direction in combination with the installation of the wall body. Steam can be used efficiently by preventing leakage to the outside of the steam injection device.
[0032]
Furthermore, it is possible to reliably prevent the steam from leaking to the outside from the transport source direction of the steam injection device by forming the wall body at the transport source direction end.
[Brief description of the drawings]
FIG. 1 is a model diagram showing a configuration of a steam injection apparatus according to the present invention.
FIG. 2 is an explanatory plan view of the steam injection device.
FIG. 3 is an explanatory plan view showing another configuration example of the steam injection device.
4A and 4B show another configuration example of the steam injection device, in which FIG. 4A is a side view illustrating a part of the steam injection device, and FIG.
FIG. 5 is a model diagram showing a configuration of a conventional steam injection device.
[Explanation of symbols]
1 ... paper sheet,
10: Steam injection device,
11 ... Main body, 12 ... Steam chamber, 13 ... Steam supply machine,
17 ... Spout, 18 ... Heated steam,
21 ... suction device,
31 ... Wall body 41 ... Wall body 51 ... Air injection device 82 ... Suction tube

Claims (6)

Steam injection means for jetting steam to the lower surface of the conveyed sheet;
A suction means for sucking the vapor reflected on the lower surface of the sheet, mounted on the transport destination direction side and / or the transport source direction side with respect to the steam injection means;
A wall formed to project from the upper surface at a position on the transport destination direction side with respect to the suction means;
While equipped with an air injection means mounted on the outside of the wall on the conveyance destination direction side and injecting air to the sheet lower surface side,
The vapor injection device according to claim 1, wherein an air injection direction by the air injection means is a direction inclined toward a conveyance source direction.   The steam injection device according to claim 1, wherein a wall body is provided at a position on a transporting source direction side with respect to the steam injection means, and the steam injection means and the suction means are sandwiched between a pair of wall bodies.   The steam injection device according to claim 2, wherein air injection means for injecting air toward the conveyance destination direction on the lower surface of the sheet is provided outside the wall body on the conveyance source direction side.   The steam injection device according to claim 1 or 3, wherein an upper portion of the wall is bent inside the steam injection device.   The steam injection device according to claim 4, wherein an air injection direction by the air injection means is a direction toward an upper portion of a bent wall body.   The steam injection device according to any one of claims 1 to 5, wherein suction pipes for sucking floating steam are provided at both ends in the width direction of the conveyed sheet.

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