JPH08209579A - Separator for paper from canvas in drier equipped with vacuum roller - Google Patents

Abstract

PURPOSE: To provide a canvas-paper separator for vacuum roll-equipped drier in which a saw-tooth cutter can be mounted also to the vacuum roll-equipped drier and the tail for threading may easily be formed and the paper can be simply threaded to the next part or section. CONSTITUTION: When paper (dotted line) is guided together with a canvas 2 running around endlessly, along a drier roll 1 → a vacuum roll 6 → a preceding drier roll (1) → a vacuum roller at the final step (6), a canvas 2 is guided by a canvas roll 11 along the preceding drier roll (1) → the canvas roll 11 →the vacuum roll at the final step (6), while the paper which would run together with the canvas 2, as it adheres thereto, is forcibly separated from the canvas 2 and guided along the preceding drier roll (1) → the final vacuum roll 6. When the paper alone passes through an open draw (a range where the paper alone passes), the paper is perforated with a saw-tooth paper cutter to form a narrow tail, then, the saw-tooth is shifted in the width direction to remove the residual part of the paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separator for separating a canvas and a paper, which is applied to a dryer with a vacuum roll for a paper machine.

[0002]

2. Description of the Related Art FIG. 3 shows a plurality of drying cylinders (hereinafter referred to as
The final stage unit of a standard type multi-cylinder dryer having a plurality of unit dryers (referred to as dryer rolls) is shown as a conventional example of a dryer part, and FIG. 4 shows the final stage unit of the multi-cylinder dryer with a vacuum roll. The conventional example of the dryer part is shown.

Referring to FIG. 3, the final stage unit dryer part of the standard type multi-cylinder dryer will be described. 1t is each upper dryer roll, 1b is each lower dryer roll,
The dryer rolls 1t and 1b are arranged in upper and lower two rows,
These dryer rolls 1t, 1 arranged in two rows above and below
A plurality of vacuum rolls 6 are arranged between b. 2 is a canvas, and the canvas 2 is each dryer roll 1 on the upper side.
And the upper vacuum rolls 3 and between the lower dryer rolls 1 and the lower vacuum rolls 3 are circulated to run between the upper roller groups and between the lower roller groups. A closed passage is formed between them.

A canvas 2 that circulates in a closed path.
Together with the paper (see dashed line), the upper dryer roll 1t
The outer peripheral surface of the lower dryer roll 1b, and then run alone (hereinafter, this running portion is referred to as an open draw). It is wound around the outer peripheral surface, then is subjected to open-drawing, is wound around the outer peripheral surface of the next lower dryer roll 1b, is then subjected to open-drawing and is wound around the outer peripheral surface of the final upper dryer roll 1t, and is dried in the meantime.

Further, the paper that has come out of the outer peripheral surface of the final upper dryer roll 1t is passed through the paper roll 4 → the part side of the next paper machine, for example, a calendar roll or a size press. When passing the paper, it is impossible to transfer the paper of full width (about 4 to 8 m), which is produced at high speed (for example, 1500 m / min), to the first roll of the next part, because it is too wide and impossible. Pass the paper with a width (about 100 mm) tail.

To make this tail, a saw blade type paper cutting device 5 is provided in the open draw portion. However, with open draw, the paper that is drying shrinks and flaps in the width direction, so that paper breaks and wrinkles easily occur. Therefore, there is a tendency to employ the multi-cylinder dryer with a vacuum roll shown in FIG. This multi-cylinder dryer with a vacuum roll is a vacuum roll (vacuum roll having an adsorption action) between each dryer roll 1.
6 is provided, and the paper (see the broken line) together with the canvas 2 that circulates in a closed path is connected to the dryer roll 1 →
The dryer roll 1 is repeatedly passed through the path of the vacuum roll 6 to the dryer roll 1, dried in the meantime, and transferred from the dryer roll 1 at the final stage to the paper roll 4 to the next part.

Since there is no open draw in the paper passage, the tail for transporting is provided with a high-pressure water cutting device 7 outside the final stage dryer roll 1 and the nozzle of the high-pressure water cutting device 7 is used. High-pressure water is wound around the dryer roll 1 at the final stage and sprayed onto the running paper, a cut is made in the running direction to make a narrow tail, and then the high-pressure water cutting device 7 is moved in the width direction. And cut out the remaining part of the paper.

Then, this narrow paper is passed to the next part through the dryer roll 1 → paper roll 4 in the final stage.

[0009]

The conventional multi-cylinder dryer with a vacuum roll shown in FIG. 4 requires the high-pressure water cutting device 7. This high-pressure water cutting device 7 is expensive and takes up space. Further, the nozzle of the high-pressure water cutting device 7 is likely to be clogged with holes. Therefore, an open draw is provided like the standard type multi-cylinder dryer shown in FIG. 3, a saw blade type paper cutting device 5 is provided in this portion, and a tail is created by the saw blade type paper cutting device 5. Although desirable, the conventional multi-cylinder dryer with a vacuum roll shown in FIG. 4 has a problem that the saw blade type paper cutting device 5 cannot be installed because there is no open draw.

The present invention has been proposed in view of the above problems, and a purpose thereof is to install a saw blade type paper cutting device also in a drying device with a vacuum roll, and to create a tail for paper feeding. There is a desire to provide a canvas-to-paper separator of a vacuum roll dryer which can be easily implemented and easily passed to the next part or section.

[0011]

In order to achieve the above object, a separating device for separating a canvas and a paper of a drying device with a vacuum roll of the present invention runs only a canvas in a canvas passage of a canvas that travels with the paper. The partial passage is formed by a canvas roll (claim 1). In the separator for separating the canvas and the paper of the drying device with a vacuum roll, an air injection nozzle may be provided on the entrance side of the canvas roll (claim 2).

[0012]

The separating device for separating the canvas and the paper of the drying device with the vacuum roll of the present invention is constructed as described above, and the paper is dried with the canvas running in the closed path to the dryer roll → the vacuum roll → the previous one. Dryer roll → Guide to the final stage vacuum roll. At this time, use the canvas roll to remove the canvas from the previous dryer roll → canvas roll →
While leading to the final stage vacuum roll, forcibly separating the paper that is trying to run closely to the canvas from the canvas and guiding it to the previous dryer roll → the final stage vacuum roll,
When passing through the open draw in the meantime, make a cut in the running direction on the paper with the rotary saw blade of the saw blade type paper cutting device to make a narrow tail, then move the saw blade in the width direction to remove the remaining paper. Cut out the part. Then, the narrow paper and the canvas are sucked again by the vacuum roll at the final stage, and then the narrow paper as the tail is passed to the next part through the dryer roll at the final stage.

[0013]

【Example】

(First Embodiment) Next, a description will be given of a canvas and paper separating apparatus of a drying apparatus with a vacuum roll according to the first embodiment of the present invention with reference to the first embodiment shown in FIG.
Are vacuum rolls arranged between the dryer rolls 1.

2 is a canvas, and the canvas 2 circulates between each dryer roll 1 and each vacuum roll 6,
A closed path is formed between the roller groups. Reference numeral 11 denotes a canvas roll arranged between the preceding dryer roll 1 and the last-stage dryer roll 1, and the canvas roll 11 forms a partial passage through which only the canvas 2 travels.

Reference numeral 5 is a saw blade type paper cutting device, and the saw blade type paper cutting device 5 is a paper traveling path (open draw) formed between the previous dryer roll 1 and the final stage vacuum roll 6. Is disposed outside the. Next, the operation of the separator for separating the canvas and the paper in the drying device with a vacuum roll shown in FIG. 1 will be specifically described.

A canvas 2 that circulates in a closed path.
At the same time, the paper is guided to the dryer roll 1 → vacuum roll 6 → the previous dryer roll 1 → the last stage dryer roll 1. At this time, the canvas roll 11 makes the canvas 2
The previous dryer roll 1 → canvas roll 11 →
While leading to the vacuum roll 6 in the final stage, the paper which is in close contact with the canvas 2 and is going to run is separated from the canvas 2, and is guided to the dryer roll 1 immediately before → the vacuum roll 6 in the final stage, and passes through the open draw in the meantime. Saw blade type paper cutting device 5
After making a cut in the running direction on the paper with the rotating saw blade of No. 3 to make a narrow tail, the saw blade is moved in the width direction to cut out the remaining portion of the paper.

Then, the narrow paper having the tail is passed to the next part through the final stage dryer roll 1 → paper roll 4. (Second Embodiment) Next, a description will be given of a canvas and paper separating device of a drying device with a vacuum roll according to a second embodiment of the present invention, which is shown in FIG. The first embodiment except that the air injection nozzle 12 is disposed outside the canvas traveling path between the roll 11 and the roll 11.
The configuration is similar to that of the embodiment.

In the separating device for separating the canvas and the paper of the drying device with a vacuum roll, the paper is dried together with the canvas 2 which runs in a closed path, the dryer roll 1 → the vacuum roll 6 → the previous dryer roll 1 → the final stage. Guide to vacuum roll 6. At this time, the canvas roll 11 makes the canvas 2
The previous dryer roll 1 → canvas roll 11 →
While leading to the vacuum roll 6 in the final stage, the paper that is in close contact with the canvas 2 and is about to travel is forcibly separated from the canvas 2 by the pressure air blown out from the air jet nozzle 12, and the dryer roll 1 in the previous stage → the final stage To the vacuum roll 6 and when passing through the open draw during that time, the saw blade type paper cutting device 5
After making a cut in the running direction on the paper with the rotating saw blade of No. 3 to make a narrow tail, the saw blade is moved in the width direction to cut out the remaining portion of the paper.

Then, the narrow paper and the canvas 2 are adsorbed again by the vacuum roll 6 in the final stage, and then the narrow paper as the tail is passed through the dryer roll 1 in the final stage → the paper roll 4 to the next stage. Pass to the part. Note that the number of each roll in FIG. 2 is not shown as a real number for the sake of simplifying the description. This point is the same as in FIGS. 1, 3, and 4.

[0020]

As described above, the separating device for separating the canvas and the paper in the drying device with the vacuum roll of the present invention forms the closed roll path and runs the paper together with the dryer roll of the paper → the vacuum roll → the previous dryer roll → Lead to the final stage vacuum roll. At this time, the canvas roll guides the canvas to the previous dryer roll → canvas roll → final vacuum roll, while forcibly separating the paper that is going to run closely to the canvas from the canvas, Guide the dryer roll to the final stage vacuum roll, and when passing through the open draw during that time, make a cut in the running direction on the paper with the rotating saw blade of the saw blade type paper cutting device to make a narrow tail, then the saw blade Move it across and cut out the rest of the paper. Then, after adsorbing the narrow paper and the canvas with the vacuum roll of the final stage again, the narrow paper with the tail is passed through the dryer roll of the final stage to the next part. A saw blade type paper cutting device can also be installed in the drying device, a tail can be easily created for paper passage, and paper can be easily passed to the next part or section.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a separating device for a canvas and a paper in a drying device with a vacuum roll of the present invention.

FIG. 2 is a side view showing a second embodiment of the separating device for the canvas and the paper of the drying device with the vacuum roll of the present invention.

FIG. 3 is a side view showing a final stage unit dryer part of a conventional standard multi-cylinder dryer.

FIG. 4 is a side view showing a final stage unit dryer part of a conventional multi-cylinder dryer with a vacuum roll.

[Explanation of symbols]

 1 each dryer roll 2 canvas 5 saw blade type paper cutting device 6 each vacuum roll 11 canvas roll 12 air injection nozzle

Claims (2)

[Claims] 1. A separating device for a canvas and a paper in a drying device with a vacuum roll, wherein a partial passage for traveling only the canvas is formed in a canvas passage of the canvas traveling with the paper. 2. The separating device for a canvas and a paper in a drying device with a vacuum roll according to claim 1, wherein an air injection nozzle is provided on the entrance side of the canvas roll.