JP3671130B2 - Sheet cutting method in the press part of a paper machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet cutting method in a paper machine, more specifically, a mechanism that separates and removes a wire trim portion that can quickly cut a sheet without involving a piece of paper and a lump thereof in a roll or paper making tool , The present invention relates to a sheet cutting method in a press part of a paper machine having a mechanism for separating and removing a press trim portion .
[0002]
[Prior art]
Conventionally, in a paper machine equipped with a mechanism that separates and removes the wire trim part and a mechanism that separates and removes the press trim part, when it is necessary to urgently cut the sheet for troubles that occur after the press part, A method of cutting the sheet by a mechanism attached to the press part is employed. For example, a sheet cutting method as shown in FIG.
[0003]
FIG. 3 is a schematic view in the periphery of a press part of a paper machine showing a conventional sheet cutting method. In FIG.
The sheet 1 adheres to the press center roll 16 together with the press trim portion 4. The sheet 1 is peeled off from the press center roll 16 by the tension after the paper roll 17 and connected to the paper roll 17 and later. On the other hand, the press trim portion 4 is separated from the sheet 1 by the cut 5 of the press trim portion when the sheet 1 is peeled off from the press center roll 16, and continues to closely contact the press center roll 16. And is stored in the press pit 19 installed at the bottom. Further, a press center roll outlet air nozzle 15 for cutting the sheet 1 is provided near the side surface of the sheet 1 on the machine side between the press center roll 16 and the paper roll 17.
[0004]
Next, a sheet cutting method in the peripheral part of the press part of a conventional paper machine will be described with reference to FIG. A sheet 1 continuing from a wire part to be described later is in close contact with the press center roll 16 with a cut portion 5 of a press trim portion attached by the wire part. The press trim portion 4 closely attached by the press center roll doctor 18 attached to the outlet of the press center roll 16 is peeled off, and the press trim portion 4 is cut from the cut 5 of the press trim portion and falls into the press pit 19 for storage. Then, the main sheet 1 itself is conveyed to the press part and thereafter by tension. Here, when any trouble occurs, the sheet center 1 cut command activates the press center roll outlet air nozzle 15 as the sheet 1 cutting means and injects air from the side surface of the sheet 1 to cut the sheet cut portion of FIG. The sheet 1 is forcibly cut as indicated by 6.
[0005]
In such a conventional sheet cutting method, the sheet is quickly cut even if air is injected from the machine side due to differences in physical properties such as sheet strength due to the raw material composition of the sheet, and equipment factors such as the sheet advance angle. May not be. At this time, a sheet | seat is not cut | disconnected rapidly, but a part or all of a sheet | seat is wound around the roll after a press center roll, or a sheet | seat becomes a lump shape and damages a roll. It also damages papermaking tools such as press felt and dryer canvas.
[0006]
In FIG. 3, when cutting the sheet 1, air is injected from the press center roll outlet air nozzle 15, and the sheet piece of the sheet 1 or the lump 7 of the sheet piece scatters at the sheet cut portion 6, and is shown in a state where it is caught in the paper roll 17. Yes.
[0007]
With respect to the schematic view of the periphery of the wire part of the paper machine showing the conventional sheet cutting method shown in FIG. 3, the upstream side of the wire part that forms the cut 5 of the press trim portion will be further described.
[0008]
FIG. 4 is a schematic view of the periphery of the wire part of a conventional paper machine. In FIG. 4, the sheet 1 on the wire 11 continues to the press part via a wire trim nozzle 8, a press trim nozzle 9, a couch roll 12, and a pickup roll 13 that are located near both ends of the sheet.
[0009]
Next, a method for forming the wire trim portion 2 and the press trim portion 4 will be described with reference to FIG. In the sheet 1, water is sprayed by the wire trim nozzle 8 to form the cut portion 3 of the wire trim portion, and water is sprayed by the subsequent press trim nozzle 9 to form the cut portion 5 of the press trim portion. The wire trim portion 2 on the outer side in the width direction of the cut portion 3 of the wire trim portion is separated from the sheet 1 in a state where the cut portion 5 of the press trim portion is attached at the lower part of the pickup roll 13, and the wire trim portion 2 is dropped from the turning roll 14. The On the other hand, the sheet 1 with the cut edge 5 in the press trim portion proceeds to the downstream press part.
[0010]
[Problems to be solved by the invention]
The object of the present invention is to quickly cut a sheet at a press center roll outlet, which could not be solved by a conventional method, so that a sheet in a press part of a paper machine without any damage such as a roll and a paper making tool. A cutting method is provided.
[0011]
[Means for Solving the Problems]
As a result of intensive studies in view of the above, the present inventors have invented a sheet cutting method in the press part of the paper machine of the present invention. That is, the sheet cutting method in the press part of the paper machine according to the present invention includes a mechanism for separating and removing the wire trim part and a mechanism for separating and removing the press trim part. The sheet is cut at the press center roll outlet by blocking water sprayed from the press trim nozzle in the part and inhibiting the separation of the press center roll outlet sheet and the press trim part in the press part. It is.
[0012]
In the present invention, the means for blocking water sprayed from the press trim nozzle in the wire part includes air blowing from the machine side, attachment of a movable blocking plate, valve closing of the nozzle spray water supply line, and movement of the nozzle spray water supply pump. It consists of any 1 type chosen from a stop.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view in the periphery of a press part of a paper machine showing a sheet cutting method according to the present invention. In FIG. 1, the sheet 1 is in close contact with a press center roll 16, and a press center roll doctor 18 is attached to the outlet of the press center roll 16. The sheet 1 is connected to the wire part and the subsequent parts through the paper roll 17. Between the press center roll 16 and the paper roll 17, there is a press pit 19 for storing the press trim portion 4.
[0014]
Next, a sheet cutting method in the periphery of the press part of the paper machine according to the present invention will be described with reference to FIG. A sheet 1 continuing from a wire part to be described later is in close contact with the press center roll 16. The press trim portion 4 closely attached by the press center roll doctor 18 attached to the outlet of the press center roll 16 is peeled off. The press trim portion 4 is cut from the cut 5 of the press trim portion, and the press pit 19 The main sheet itself is conveyed to the press part and thereafter by tension. Here, when some trouble occurs, the wire part can stop the cut trim 5 of the press trim portion in response to the cutting command of the sheet 1 as will be described later by the cutting command of the sheet 1. The sheet 1 without the cut 5 in the press trim portion is in close contact with the press center roll 16 and is torn from the cut 5 in the press trim portion by the tension, and a tear as shown in the sheet cut portion 6 is generated. Is cut. In this case, unlike the forcible sheet cutting using the conventional press center roll outlet air nozzle 15, the sheet cutting operation is performed promptly without scattering a piece of paper or a lump of paper pieces. As a result, part or all of the sheet is not wound around the roll after the press center roll, and the sheet does not form a lump and damage the roll. Moreover, it does not damage paper making tools such as press felt and dryer canvas.
[0015]
With respect to the schematic diagram in the peripheral part of the press part of the paper machine showing the sheet cutting method according to the present invention shown in FIG. 1, the peripheral part of the upstream wire part that stops the formation of the cut portion 5 of the press trim part will be further described.
[0016]
FIG. 2 is a schematic view of the periphery of the wire part of the paper machine of the present invention. In FIG. 2, the sheet 1 on the wire 11 passes through a wire trim nozzle 8, a press trim nozzle 9, a press trim nozzle cutting air nozzle 10, a couch roll 12, and a pick-up roll 13 that are located in the vicinity of both ends of the sheet to the press part. It continues with.
[0017]
Next, a method for stopping the formation of the wire trim portion and the press trim portion will be described with reference to FIG. In the sheet 1, water is sprayed by the wire trim nozzle 8 to form the cut portion 3 of the wire trim portion, and water is sprayed by the subsequent press trim nozzle 9 to form the cut portion 5 of the press trim portion. (The process up to this point is the same as in FIG. 4 described above.) Here, when a cutting command for the sheet 1 is issued, air is injected from the air nozzle 10 for cutting the press trim nozzle 9 to the injection port of the press trim nozzle 9, and water is discharged. Shut off the spray. As a result, the cut 1 of the press trim portion is not formed in the sheet 1 and the sheet 1 proceeds to the downstream press part. On the other hand, the wire trim part 2 on the outer side in the width direction of the cut part 3 of the wire trim part is separated from the sheet 1 with the cut part 5 of the press trim part at the lower part of the pickup roll 13, and the wire trim part 2 is separated from the turning roll 14. Be dropped.
[0018]
As a means for blocking the water injection of the press trim nozzle 9 in FIG. 2, the embodiment using the air nozzle for cutting the press trim nozzle has been described, but the valve of the nozzle spray water supply line provided with a movable blocking plate is closed. The nozzle spray water supply pump can be applied as needed as appropriate, such as moving the nozzle spray water supply pump.
[0019]
【The invention's effect】
The sheet cutting method in the press part of the paper machine of the present invention is such that the sheet is cut quickly by blocking the water sprayed from the press trim nozzle in the wire part, and damage to the roll and paper making tools Can be eliminated.
[Brief description of the drawings]
FIG. 1 is a schematic view of the periphery of a press part of a paper machine showing a sheet cutting method according to the present invention.
FIG. 2 is a schematic view of the periphery of the wire part of the paper machine of the present invention.
FIG. 3 is a schematic view of a peripheral portion of a press part of a paper machine showing a conventional sheet cutting method.
FIG. 4 is a schematic view of the periphery of a wire part of a conventional paper machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheet 2 Wire trim part 3 Wire trim part cut 4 Press trim part 5 Press trim part cut 6 Sheet cut part 7 Paper piece lump 8 Wire trim nozzle 9 Press trim nozzle 10 Press trim nozzle cut air nozzle 11 Wire 12 Couch roll 13 Pickup roll 14 Turning roll 15 Press center roll outlet air nozzle 16 Press center roll 17 Paper roll 18 Press center roll doctor 19 Press pit

Claims (2)

A mechanism for separating and removing a trim part (hereinafter referred to as a wire trim part) separated from a sheet by a wire part, and a mechanism for separating and removing a trim part (hereinafter referred to as a press trim part) separated from a sheet by a press part . in the sheet cutting method in the press part of a paper machine, by blocking the water ejected from the press trim nozzles in the wire part, inhibit the separation of the sheet and the press trim portion of the press center roll outlet at the press part, a press center A sheet cutting method in a press part of a paper machine, wherein the sheet is cut at a roll outlet. The means for shutting off the water sprayed from the press trim nozzle in the wire part is selected from air blowing from the machine side, attachment of a movable shut-off plate, valve closing of the nozzle jet water supply line, and movable stop of the nozzle jet water supply pump 2. The sheet cutting method for a paper machine according to claim 1, wherein the sheet cutting method comprises any one of the above.

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