JPH1077592A - Paper-cutting machine in paper-making installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper-cutting machine which can automatically break the paper in no need of manual help, when paper breakage occurs, and can minimize the area of breakage in a paper-making installation. SOLUTION: In the case that the paper breakage is detected by the drier intermediate paper breakage sensor 1, the drier outlet paper breakage sensor 2, the calender inlet paper breakage sensor 3, and the calender outlet paper breakage sensor 4, respectively, the breakage location is specified based on the sensor signal. When the paper breakage point is after the drier part, the paper breakage detection circuit 6 generate the moderating command S1 to set a speed difference between the press part and the drier part enough to cause forced breakage 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 paper cutting machine in a paper machine facility for forcibly cutting paper at a predetermined location when a sudden break is detected during the operation of the paper machine facility.

[0002]

2. Description of the Related Art As shown in FIG. 3, a general paper machine equipment includes a wire part 101, a No. 1 press part 102,
A No. 2 press part 103, a No. 3 press part 104, a dryer part 105, a calendar part 106, and a reel part 107 are provided. These wire part 101, No.1 press part 102, No.2 press part 1
03 and No.3 Press Part 104 Wet Part 1
The wet part 108, the dryer part 105, the calendar part 106, and the reel part 107 are installed on the second floor of the paper machine equipment. Further, a pulper 109 is provided on the first floor portion below the wet part 108 of the paper machine equipment, for collecting paper that has been cut and dropped and returning it to raw materials for reuse.

[0003] In the wire part 101, pulp slurry as a raw material is sprayed on a wire, and is gradually dehydrated on the wire to form a wet paper. This wet paper is No.1 press part 102, No.2 press part 10
3 and No. 3 The water is squeezed while passing through the press part 104. The drained paper is transferred to the next dryer part 105. The dryer part 105 is provided with a plurality of rotating drums for drying, and is dried by the heat of the rotating drum in the process of being transferred while being in contact with the rotating drum surface, and reaches the calendar part 106. In the calender part 106, the dried paper surface is polished, and the paper exiting the calender part 106 is wound around a reel in a reel part 107. The paper machine equipment equipped with each of these parts 101 to 107 has 24 parts.
It is generally operated continuously for hours.

[0004]

However, in the above-mentioned paper machine equipment, paper breakage occurs during its operation due to external factors, raw material factors and other various factors. When paper breaks out, it may be during the day or late at night,
Irregular. Further, the place where the paper is cut is not constant, for example, between the No. 3 press part 104 and the dryer part 105 or between the dryer part 105 and the calendar part 106 shown in FIG. Wire part 1
When a paper break occurs between the so-called wet parts 108 from No. 01 to No. 3 press part 104, the cut paper falls on the pulper 109 provided on the first floor part. The falling paper is
It is returned to raw materials and reused. If the paper break occurs after the dryer part 105, not the pulper 109,
They either dropped directly on the ground floor or scraped out of the machine. In particular, since the dryer part 105 has a long distance, if the paper breaks inside the part, the paper may overflow inside. In this case, the operator forcibly cuts the paper and puts the paper on the pulper 109. Must be dropped. Resuming the operation from such a situation requires the operator to process the paper in the machine, and a great loss has occurred with an increase in the machine speed.

It is to be noted that although a sheet break sensor is provided at a predetermined location to detect the occurrence of a sheet break, this sheet break sensor is used only for an alarm. Manual treatment was still required, and delays in intervention had a significant effect on productivity and hindered efficient operation of operations.

The present invention has been made in view of the above circumstances, and an object of the present invention is to automatically cut a sheet without manual operation when the sheet is cut, and to minimize the occurrence of a sheet break. It is an object of the present invention to provide a paper cutting device in a paper machine facility which can be limited to a maximum.

[0007]

In order to achieve the above object, according to the present invention, there is provided a press part for squeezing wet paper web formed by a wire part, and drying the paper passing through the press part. In a paper machine having at least a dryer part to be cut, sheet break sensors installed at a plurality of locations of the paper machine, and if sheet break is detected by the sheet break sensor, the sheet is cut based on the sensor signal. Means for specifying the location, and if the characteristic paper break location is after the dryer part, provide a speed difference required for forcibly generating a paper break between the press part and the dryer part. And means.

According to the above construction, if a paper break occurs during papermaking, the cut position is characterized, and if the cut position is after the dryer part, the position between the press part and the dryer part is changed. Then, a speed difference is given to force the paper break. For example, a speed reference such that the speed of the press part is lower than the speed of the dryer part is generated and supplied to the speed setting device. As a result, the paper is forcibly cut off before the dryer part, so that the occurrence of waste paper can be prevented, and it is not necessary to manually remove the paper in the dryer part.

According to a second aspect of the present invention, in the paper cutting apparatus of the paper machine equipment according to the first aspect, a pulper is provided immediately below each of the wire part and the press part, and a pulper is provided between the press part and the dryer part. The paper cut off due to the speed difference is collected by the pulper.

According to the above configuration, the paper that has been cut and dropped can be collected by the pulper and reused.
Efficient and resource-saving paper machine equipment can be configured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of a paper cutting device in a paper machine according to the present invention. Since the overall configuration of the paper machine equipment in this embodiment is also the same as that shown in FIG.
This embodiment will be described with reference to FIG.

As shown in FIG. 1, in this paper machine equipment, as a paper break sensor group, a dryer intermediate paper break sensor 1 provided in the middle of the dryer part 105 and a dryer provided at an outlet of the dryer part 105 are provided. An exit paper cut sensor 2, a calendar entrance paper cut sensor 3 provided at the entrance of the calendar part 106, and a calendar exit paper cut sensor 4 provided at the calendar part exit. Also, a speed return button 5 for returning the speed reference signal of the No. 3 press part whose speed has been reduced at the time of sheet break detection to the original speed.
It has. The sheet break detection signals of the sheet break sensors 1 to 4 and the speed return command signal of the speed return button 5 are supplied to a sheet break detection circuit 6.

A sheet break detection circuit 6 monitors the presence or absence of supply of each sheet break detection signal from each of the sheet break sensors 1-4, and receives a sheet break detection signal from any one of the sheet break sensors 1-4. Then, based on the sheet break detection signal, the position of the sheet break is specified, and a deceleration command S1 is generated and supplied to the sheet break speed reduction circuit 7.

The paper cutting speed reduction circuit 7 has a
The speed reference signal of No. 3 press part is supplied, and when the deceleration command S1 is supplied, the built-in arithmetic circuit
A reference signal obtained by decelerating the speed reference signal of the No. 3 press part by about 1/3 is generated and supplied to the acceleration / deceleration control circuit 9.

The acceleration / deceleration control circuit 9 supplies a No. 3 press part speed reference signal, which has been reduced to about 1/3, to a predetermined electric motor to reduce the paper making speed. As a result, a large speed difference is generated between the No. 3 press part 104 and the dryer part 105.
Is forcibly cut off immediately before

More specifically, as shown in FIG. 2A, when a paper break occurs near the middle of the dryer part 105, the output of the dryer middle paper cut sensor 1 is turned on, and the paper cut detection circuit 6 Output the ON signal. As a result, the paper break detection circuit 6 recognizes that the paper has run out in the middle of the dryer part 105, and immediately executes the deceleration command S.
1 is output to the paper cutting speed reduction circuit 7. In response to the deceleration command S1, the paper cutting speed reduction circuit 7 executes an operation for reducing the No. 3 press part speed reference signal from the speed setting device 8 to 1/3. Figure 2 shows the reduced No. 3 press part speed reference signal
It is shown in (B). Then, the reduced No. 3 press part speed reference signal is supplied via the acceleration / deceleration control circuit 9 to the electric motor driving the No. 3 press part. As a result, as described above, the speed of the No. 3 press part 104 is reduced more rapidly than the speed of the dryer part 10, and the sheet is forcibly cut by the speed difference. Forcibly cut paper is 1
Collected by the pulper 109 provided on the floor, and reused. When the speed-return button 5 is operated by the operator after the sheet-break processing is completed, a return command S2 is output from the sheet-break detection circuit 6 to the sheet-break speed reduction circuit 7. As a result, the paper cutting speed reduction circuit 7 stops the arithmetic processing for reducing the speed reference signal of the No. 3 press part from the paper speed setting device 8 to 1/3, and the No. 3 press part from the paper speed setting device 8 The speed reference signal is output to the acceleration / deceleration control circuit 9 as it is. As a result, No. 3
The press part speed reference signal returns to the speed before the paper break occurred.
Thereafter, the above-described sheet-break monitoring processing, sheet-break detection processing, and forced sheet-break processing are executed again.

In the above-described embodiment, four paper break sensors are provided: a dryer part middle, a dryer part outlet, a calendar part inlet, and a calendar part outlet.
However, the present invention is not limited to this, and it may be provided at a dryer inlet or at a plurality of locations in the middle of the dryer.

In the above-described embodiment, when a paper break occurs, the No. 3 press part speed reference signal is reduced to 1/3 to provide a speed difference with the dryer part 105. In short, it is sufficient if there is a speed difference required for forced sheet cutting between the No. 3 press part 104 and the dryer part 105, and control to increase the speed of the dryer part 105 may be performed.

[0019]

As described above, according to the present invention, according to the first aspect of the present invention, when a sheet break occurs during papermaking, the cut point is characterized, and the cut point is after the dryer part. In that case, between the press part and the dryer part,
Because it was configured to force a paper break by giving a speed difference. It is possible to prevent the occurrence of waste paper and eliminate the need to manually remove paper in the dryer part.

According to the second aspect of the present invention, the paper that has been cut and dropped can be collected and reused by the pulper, so that an efficient and resource-saving paper machine can be constructed.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing one embodiment of a paper cutting device in a paper machine facility according to the present invention.

FIG. 2 is a waveform diagram for explaining an operation showing an output of a dryer intermediate sheet cut sensor and an output of a speed reference signal of a No. 3 press part.

FIG. 3 is an explanatory diagram showing the overall configuration of a general paper machine facility.

[Description of Signs] 1 Dryer intermediate sheet cut sensor 2 Dryer outlet sheet cut sensor 3 Calendar inlet sheet cut sensor 4 Calendar outlet sheet cut sensor 5 Speed return button 6 Sheet cut detection circuit 7 Sheet cut speed reduction circuit 8 Speed setting device 9 Deceleration control circuit 101 Wire part 102 No.1 press part 103 No.2 press part 104 No.3 press part 105 Dryer part 106 Calendar part 107 Reel part 108 Wet part 109 Pulper

Claims (2)

[Claims] 1. A paper machine having at least a press part for squeezing wet paper formed by a wire part and a dryer part for drying paper passing through the press part, wherein the press part is installed at a plurality of locations of the paper machine. A broken sheet sensor, means for specifying a broken sheet portion based on the sensor signal when a broken sheet is detected by the broken sheet sensor, and a characteristic broken sheet portion is after the dryer part. In this case, between the press part and the dryer part,
Means for providing a speed difference necessary for forcibly generating a paper break. 2. The paper cutting device in the paper machine equipment according to claim 1, wherein a pulper is installed immediately below each of the wire part and the press part, and a speed difference between the press part and the dryer part is reduced. A paper cutting device in the maintenance of a paper machine, wherein the paper forcedly cut off due to the paper is collected by the pulper.