JPH11279978A - Apparatus for preventing tail paper from winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a tail paper from winding around a spool roll by attaching a suction device to a doctor back of a pope reel and sucking a paper sheet. SOLUTION: A suction device having a shell in the form of an inverted V-shaped type cross section and provided with suction holes Q passing through the metal plate is attached to a hermetically sealed doctor back D capable of introducing pressurized air through a high-pressure air tube E installed on the side of a paper outlet of a pope reel C thereinto to suck a paper sheet and prevent the paper sheet from winding around spool rolls A and B when winding a paper of a continuous length and a constant width around the two spool rolls A and B capable of regulating the spacing between the spool rolls A and B and the freely rotatable pope reel C at the outlet of a paper machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper winding device in a paper mill.

[0002]

2. Description of the Related Art In a paper mill, paper made by a paper machine is wound around an iron core at an outlet of the paper machine. After that, it is used for various purposes such as newspapers, magazines, books, or packaging, but in the usual case, before that, if necessary, it is cut into small widths or cut into appropriate lengths and widths ,
It is used after printing or folds for bending according to the application.

In a paper mill, in order to increase productivity, the width of paper made by a paper machine is almost 2 m even if it is narrow.
As described above, the paper emerges from the outlet of the paper machine with a width much larger than the width actually used for printing or the like. Paper with such a large width and coming out at a speed of about 1000 m / min once
It is wound on a spool roll by the winding machine shown in FIG.

[0004] In order to prevent the paper from wrinkling or creases during winding, the winding roll is required to form an accurate cylindrical shape.
The winding roll of the winding machine is installed so as to be perpendicular to the running direction of the paper.

[0005] Because paper has low rigidity, wrinkles and breaks occur when handling wide paper. For this reason, when the leading edge of the paper is first passed through the winder, the width of the paper must be reduced to cause wrinkling or folding. Continuing to wind up with wrinkles and folds will cause the wound paper roll to become an incorrect cylinder, causing slack inside the paper roll and uneven tensile stress, resulting in uneven paper dimensions. Obstacles come out. For this reason, the width of the leading end portion of the first paper is reduced, and the width is gradually increased while the paper is passed.

In FIGS. 1 to 3, reference numerals A and B denote spool rolls on which paper is to be wound. The spool rolls A and B are brought into contact with the poplar C, and are not normally connected to a rotary drive. Popril C is a roll that assists the spool roll to take up the paper, and is connected to a rotary driving device, thereby applying a rotational force. D is a doctor back.

The paper coming out of the paper machine is taken up by a spool roll A or a spool roll B. When the paper is wound on the spool roll, a double-sided adhesive tape is applied to the roll surface of the spool roll so that the paper winds around the spool roll, and the adhesive surface is exposed and kept on standby. When the spool roll A is in a standby state, the spool roll A is kept at an appropriate interval so as not to come into contact with Popril C. Spool roll B is Popril C
And feeds the paper in the rotating direction. The doctor back D plays a role of separating the paper from the poplar C so that the paper is not wrapped around the poplar C.

[0008] Similarly, when the paper is wound on the spool roll B, a double-sided adhesive tape is applied to the roll surface of the spool roll B so that the paper is wound, the adhesive surface is exposed, and the spool is kept on standby. An appropriate distance is maintained so as not to contact C.

As described above, paper has low rigidity, is easily broken, and easily wrinkles. Therefore, paper that comes out from the outlet of the paper machine with a width of 2 m or more is suddenly rolled into a spool roll.
It is difficult to wind in a direction perpendicular to the running direction.
Therefore, as shown in FIG. 1, a method of gradually increasing the width by first passing a narrow one from the left end or the right end is adopted.

[0010] This narrow portion is called tail paper,
After passing through the nip portion between the poplar and the spool roll, it is discharged outside the machine and sent to a paper raw material regeneration process. When the winding is continued while the tail is being wound, as shown in FIG. 2, the diameter of the roll portion on which the tail paper is wound becomes larger than the other roll portions, so that the shape of the wound paper roll is accurate. Since it is not formed in a columnar shape and has drawbacks such as wrinkles, it must be prevented.

[0011]

When the paper coming out of the paper machine is wound, as described above, the tail paper is discharged outside the machine until the paper travels in a normal state. In other words, when the spool roll A is to be taken up, the spool roll A is kept in a standby state with an interval from the pop reel C until the tail paper at the beginning of passing the paper passes and travels normally with the full width of the paper. During this time, the tail paper is discharged outside the machine through the space between the spool roll B and the pop reel C.

At this time, the paper may not be wound on the spool roll B in some cases, or the paper may already be wound on the spool roll B as shown in FIG. The paper running on the paper machine is charged with static electricity, and when the paper is not wound on the spool roll B, the diameter of the spool roll B is small.
Paper wraps easily. When the paper is wound on the spool roll B, the roll diameter is large. However, as shown in FIG. 3, the paper is drawn to the paper roll of the spool roll B by the static electricity and easily wound around the paper roll.

Therefore, when the paper is wound on the unintended spool roll, the machine must be stopped, the wound paper must be removed, and the winding operation must be restarted from the beginning. As a countermeasure, the spool roll B
Although it is conceivable to provide a doctor bag provided on the poplar C, the spool roll B is used not only for sending out the tail paper but also for winding, so when the spool roll B is used for winding, In addition, the doctor back is in the way and requires work such as temporary removal, which lowers the winding work efficiency and is not an effective measure. The present invention seeks to solve the above-mentioned problems by using the apparatus described below.

[0014]

The present invention has solved the above-mentioned problems by providing a suction device as shown in FIG. 1 in the doctor back D in FIG. That is, the suction device shown in FIG. 4 is attached to the doctor back D, the paper sheet is sucked by the suction device, and the paper is prevented from being wound around the spool roll B. The suction device is shown in FIG.
Like, the cross section of the outer shell is an inverted V-shaped metal plate,
The front outer shell M is provided with a suction hole Q penetrating the metal plate of the outer shell M, and the rear outer shell N is provided with a compressed air introduction hole P penetrating the metal plate of the outer shell N. On the front side of the inside, the suction hole Q is covered while keeping a certain gap between the outer shell M and the outside so that the compressed air introduced from the compressed air introduction hole P is not discharged from the suction hole Q. A partition plate F is provided. Behind the partition plate F, a partition plate G for vertically dividing the compressed air flow introduced from the compressed air introduction hole P into two is provided. The distance between the partition plate G and the partition plate F becomes narrower toward the lower opening.

The compressed air is introduced from the high-pressure air pipe E into the sealed doctor bag D, and enters the inside of the suction device through the compressed air introduction hole P. When compressed air is introduced,
At the entrance of the compressed air introduction hole P, the compressed air separates into an airflow flowing between the partition plate G and the partition plate F and an airflow flowing between the partition plate G and the outer shell N on the back surface, and passes through the lower portion. Divider G
The distance between the partition plate F and the partition plate F becomes narrower toward the tip, so that the compressed air introduced from the compressed air introduction hole P is accelerated between the partition plate G and the partition plate F and enters the suction device. Creates a negative pressure. Similarly, the airflow flowing between the other partition plate G and the outer shell N on the back surface also generates a negative pressure inside the suction device.

Therefore, the air pressure is lower in the vicinity of the suction hole Q than in the outside air, and the outside air enters from the suction hole Q toward the inside. This serves as a suction force to attract the paper sheet and prevent the paper sheet from winding around the spool roll B.

In FIG. 4, at the entrance of the compressed air introduction hole P, the compressed air is divided into upper and lower parts by the partition plate G. The mounting position may be lowered, and compressed air may be introduced only into the gap between the partition plate G and the partition plate F. However, by introducing compressed air between the partition plate G and the outer shell N,
By generating a negative pressure there and reducing the difference in air pressure between the front and back surfaces of the partition plate G, the partition plate G can be prevented from vibrating due to the airflow of the compressed air, and the flow of the airflow can be stabilized. Therefore, if there is a sufficient amount of compressed air, it is preferable to divide the compressed air into two vertically by the partition plate G.

When the compressed air is not divided into upper and lower parts by the partition plate G, it is conceivable to use the partition plate G and the outer shell N together, but in this case, since the cross-sectional shape does not become inverted V-shaped, the doctor back D It becomes difficult to install,
Since the surface of the outer shell M does not have an angle at which the discharged tail paper is easily captured, it becomes difficult to suck the tail paper.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The effective suction width of a suction device in the present invention is substantially the width of tail paper. The tail paper is usually 15 cm to 25 cm, but a sufficient effect can be obtained even if the tail paper is 20 cm smaller than the width of the tail paper. However, since the tail paper is easy to meander, it is desirable to keep the width of the tail paper as large as possible. Even if a device having a larger width is installed, the cost of manufacturing the device and the consumed compressed air are wasted.

The suction device shown in FIG. 4 is an example of the embodiment of the present invention, but any other suitable suction device may be used. However, if the suction force is too strong, the tail paper attracted to the suction device will be in close contact with the suction device and will not be discharged toward the collection process, so the suction force must not be too large.

Incidentally, the suction device of FIG. 1 or FIG. 4 which is an example of the embodiment of the suction device according to the present invention has nine suction holes,
Effective suction width 20 cm, long diameter of suction hole 15 mm, introduced compressed air pressure 1.0 kg / cm ² , wind speed at inlet of suction hole 3.0
m / sec.

Since the suction is not required after the tail paper has been discharged outside the machine, at the start of winding, the leading end of the tail paper is introduced into the winding device by an air chute and simultaneously compressed from the back of the suction device. An open / close valve that opens automatically in conjunction with the air chute is installed in the compressed air introduction line so that air can be introduced, and a sensor that detects the paper width is installed before or after the suction device. The sensor and the on-off valve can be linked so as to prevent unnecessary leakage of compressed air so that the on-off valve can be automatically closed simultaneously with the discharge.

[0023]

According to the present invention, as described above, the tail paper can be prevented from winding around the spool roll, can be reliably sent to the collection step, and can be attached to an existing doctor bag. .

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a winding device of the present invention.

FIG. 2 is an explanatory perspective view of a state in which tail paper is wound.

FIG. 3 is an explanatory cross-sectional view of a state in which tail paper is wound.

FIG. 4 is an explanatory view of a suction device of the winding device of the present invention.

[Explanation of symbols]

 Reference Signs List A Spool roll B Spool roll C Popril D Doctor back E High-pressure air pipe F Partition plate G Partition plate M Front shell of suction device N Rear shell of suction device P Compressed air introduction hole Q Suction hole

Claims (2)

[Claims] An apparatus for winding long paper of a fixed width into a cylindrical shape, comprising: A drive-rotatable poplar (C), two spool rolls (A) and (B) with adjustable spacing between the poplar (C) and a paper outlet side of the poplar (C) are sealed. 1. A doctor bag (D) and a high-pressure air pipe (E) for introducing compressed air into the doctor bag are provided. 2. At one end in the width direction of the doctor bag (D), a suction device made of a metal plate communicating with the inside of the doctor bag (D) is provided. The cross section of the outer shell of the suction device is an inverted V-shape in which the upper part is closed and the lower part is open, and the outer shell (M) on the front side penetrates the metal plate of the outer shell (M). A suction hole (Q) is provided, and a compressed air introduction hole (P) penetrating through a metal plate of the outer shell (N) is provided in a rear outer shell (N) in contact with the doctor back (D), and compressed air is provided. 3. The inside of the suction device and the inside of the doctor bag (D) communicate with each other via the introduction hole (P); On the front side inside the suction device, a partition plate (F) that covers a suction hole (Q) while maintaining a constant gap with the outer shell (M), and another partition plate ( G) is provided behind the partition (F); The distance between the partition plate (F) and the partition plate (G) is such that the distance between the partition plate (F) and the partition plate (G) becomes smaller toward the lower part, and the compressed air introduced from the compressed air introduction hole (P) is separated from the partition plate (F) and the partition plate (G). (G) a paper winding device, which is attached so as to flow toward the lower opening portion. 2. The partition plate (G) has a compressed air introduction hole (P).
2. The paper winding device according to claim 1, wherein the device is attached so as to divide the compressed air introduced from the upper and lower portions into upper and lower portions.