JP5793750B2 - Paper material dissolution processing apparatus and dissolution processing method - Google Patents

Description

  The present invention relates to a paper material dissolution treatment apparatus and a dissolution treatment method.

  There is known a method in which when a document on which confidential information or personal information is written is discarded, a paper material made of the document is stirred together with water and dissolved in order to avoid leakage of the information. In Patent Document 1 below, a paper material on which important information is described is shredded by a shredder, stirred with water and dissolved to obtain waste paper pulp, and the obtained waste paper pulp is removed with a deinking device. A used paper processing apparatus is described that performs deinking processing and paper making with a paper making apparatus to prepare recycled paper.

JP 2009-299228 A

In Patent Document 1, depending on the type of paper material to be processed, the paper material may not be easily dissolved. When the paper material is stirred with water, air is mixed into the liquid in the stirring tank. There is. Further, even when the mixing ratio of the paper material and water is not adjusted to an appropriate range, air is mixed into the liquid in the stirring tank, and the progress of the dissolution process is hindered.

SUMMARY OF THE INVENTION The present invention solves the above-described problems, and a paper material dissolution treatment apparatus and paper material dissolution treatment capable of appropriately proceeding with the paper material dissolution treatment regardless of the type of paper material and the mixing ratio with water. The purpose is to provide a method.

  In order to achieve the above object, a paper material dissolution treatment apparatus according to the present invention comprises a stirring tank provided with a stirring blade for stirring and dissolving a paper material together with water supplied from a water supply unit, and the stirring tank And a control unit that controls to decelerate the rotation of the stirring blade when the detection value of the vibration detector becomes a predetermined value or more.

Moreover, in the said structure, a control part rotates a stirring blade in the reverse direction before deceleration after the detection value of a vibration detector becomes more than predetermined value and decelerates rotation of a stirring blade.

And in each said structure, a control part returns the rotational speed of a stirring blade to the rotational speed before deceleration, after the detected value of a vibration detector becomes more than predetermined value and decelerates rotation of a stirring blade.

Further, in each configuration described above, when the number of times that the detection value of the vibration detector is equal to or greater than the predetermined value exceeds the predetermined number, the control unit stops the rotation of the stirring blade and notifies the notification unit of an error.

Further, in each of the above-described configurations, the control unit performs control such that the rotation of the stirring blade is reduced when a detection value of the vibration detector becomes equal to or higher than a predetermined value, after a predetermined time has elapsed from the start of the paper material dissolution processing. .

In the paper material dissolution treatment method according to the present invention, the paper material is stirred together with water supplied from the water supply unit by a stirring blade in a stirring tank, and when the paper material is dissolved, vibration of the stirring tank is performed. The rotation of the stirring blade is decelerated when it is detected by a vibration detector and the detection value of the vibration detector becomes a predetermined value or more.

Moreover, in the said structure, after the detection value of a vibration detector becomes more than predetermined value and decelerates rotation of a stirring blade, a stirring blade is rotated in the reverse direction to before deceleration.

And in each said structure, after the detected value of a vibration detector becomes more than predetermined value and decelerates rotation of a stirring blade, rotation of a stirring blade is returned to the rotational speed before deceleration.

Furthermore, in each said structure, when the frequency | count that the detection value of a vibration detector becomes more than a predetermined value exceeds a predetermined frequency | count, while stopping a stirring blade, an alerting | reporting means is alert | reported.

Further, in each of the above-described configurations, the rotation of the stirring blade is reduced when the detection value of the vibration detector becomes equal to or greater than a predetermined value, after a predetermined time has elapsed from the start of the paper material dissolution process.

According to the paper material dissolution treatment apparatus according to the present invention, when the detection value of the vibration detector becomes equal to or greater than a predetermined value, the control unit controls to decelerate the rotation of the stirring blade. Air in the liquid in the stirring vessel that could not be removed by the rotation of the blades is removed by the deceleration of the stirring blades, and the dissolution process proceeds properly.

In addition, when the detected value of the vibration detector becomes a predetermined value or more and the control unit decelerates the rotation of the stirring blade and then rotates the stirring blade in the direction opposite to that before the deceleration, the control unit Air can be removed more efficiently.

Then, when the detected value of the vibration detector becomes equal to or greater than the predetermined value and the rotation speed of the stirring blade is decelerated and then the rotation speed of the stirring blade is returned to the rotation speed before the deceleration, After removing the air contained in the liquid in the stirring tank, the dissolution process can be resumed at the rotational speed before deceleration.

The control unit stops the rotation of the stirring blade when the number of times that the detection value of the vibration detector is equal to or greater than the predetermined value exceeds the predetermined number of times, and when notifying the notification means of an error, It can be determined that a foreign substance that is difficult to dissolve is mixed in the liquid, the dissolution process is terminated, and the occurrence of an error can be notified to the user.

  Furthermore, when the control unit controls to decelerate the rotation of the stirring blade when the detection value of the vibration detector becomes equal to or higher than a predetermined value, the control unit performs the dissolution process after a predetermined time has elapsed since the start of the paper material dissolution process. In the unstable state immediately after the start, the stirring blade is not decelerated by detecting the vibration. On the other hand, when a problem such as air mixing occurs after the lapse of a predetermined time that should stabilize, the control unit can find such a problem by detecting vibration and deal with it by a deceleration operation. Can do.

Further, according to the paper material dissolution treatment method of the present invention, when the vibration of the stirring tank is detected by the vibration detector, and the detected value of the vibration detector becomes a predetermined value or more, the rotation of the stirring blade Therefore, it is possible to easily remove air contained in the liquid in the stirring tank.

In addition, when the detected value of the vibration detector is equal to or greater than the predetermined value and the stirring blade is decelerated and then the stirring blade is rotated in the opposite direction to that before the deceleration, the stirring vessel is rotated by the rotation of the stirring blade in the opposite direction. The air inside can be removed more efficiently than the removal.

When the detection value of the vibration detector becomes equal to or higher than the predetermined value and the rotation of the stirring blade is decelerated, the air contained in the liquid in the stirring tank is removed when the rotation of the stirring blade is returned to the rotational speed before the deceleration. After that, the paper material dissolution process can be resumed.

Furthermore, when the number of times that the detection value of the vibration detector exceeds the predetermined value exceeds the predetermined number, the stirring blade is stopped, and when notifying the notification means of an error, it is difficult to dissolve the film or the like on the paper material. It is possible to determine that foreign matter is mixed in, end the melting process, and notify the user of the occurrence of an error.

Further, when the rotation speed of the stirring blade is reduced after a predetermined time has elapsed since the start of the paper material dissolution process when the detection value of the vibration detector becomes equal to or greater than the predetermined value, In an unstable state that has not yet become familiar, while maintaining the rotation speed of the stirring blade, proceed with the dissolution process as soon as possible, and proceed with the dissolution process after a predetermined time and stir at the stage where the liquid state should be stable When air is contained in the liquid in the tank, the air can be removed and the dissolution process can proceed appropriately.

1 is a perspective view of a paper material dissolution treatment apparatus according to an embodiment of the present invention. It is a side view of the said melt | dissolution treatment apparatus of the paper material. It is a figure which shows the control flow of the said melt | dissolution treatment apparatus of the paper material. It is a figure which shows the control flow of the vibration detection process of the said melt | dissolution processing apparatus of a paper material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a paper material dissolution processing apparatus according to the present invention, and FIG. 2 is a side view of the paper material dissolution processing apparatus. The paper material dissolution treatment apparatus 1 includes a stirring tank 2. The stirring tank 2 is formed in a bottomed cylindrical shape and has an upper opening. The agitation tank 2 is accommodated inside a rectangular parallelepiped support frame 3. The support frame 3 is supported by the base frame 5 via the seismic isolation material 4.

The support frame 3 includes a lower support 7, four support pillars 8, and an upper support 9. The lower support body 7 is formed in a shallow box shape having an upper opening, and supports the stirring tank 2 from below. The support columns 8 are made of a steel material such as channel steel and are erected at the four corners of the lower support 7. The upper support 9 is formed in a shallow box shape in which the periphery of the rectangular plate-shaped member 10 rises slightly. The upper ends of the four support pillars 8 are fixed to the lower surface of the plate member 10. The plate-like member 10 has an opening 11 for feeding paper material at a position facing the upper opening of the stirring tank 2. The upper support 9 is slidably installed with a lid 12 that closes the upper opening of the stirring tank 2.

The lid 12 is formed in a thin plate shape and is moved by the moving means 15. The moving means 15 includes a slide member 16, a plurality of pulleys 17, a pair of endless belts 18, a pair of guide bars 19, and a slide drive unit 20. A lid 12 is suspended from the lower surface of the slide member 16. Both ends of the slide member 16 are fixed to a belt 18 that runs on the upper side. The rotating shaft 21 of the pulley 17 is pivotally supported by a pair of vertical plates 24 erected on the plate-like member 10 so that both ends of the rotating shaft 21 are rotatable. The guide rod 19 is installed in parallel to the traveling track of the belt 18. Both ends of the guide bar 19 are supported by the horizontal plate 25. The horizontal plate 25 is erected on the plate-like member 10, and both end edges are fixed to the vertical plate 24. By driving the slide drive unit 20, the pulley 17 is rotated, and the slide member 16 fixed to the upper belt 18 is moved while being rotated around the belt 18. Slide.

The upper support 9 is provided with a vibration detector 27. The vibration detector 27 detects the vibration of the agitation tank 2 by detecting the vibration of the support frame 3. As the vibration detector 27, for example, an acceleration sensor, a vibration sensor, a noise detection sensor, or the like is applied. As an acceleration sensor, for example, a piezoelectric type using a piezoelectric element, a capacitance type using a capacitor, a piezoresistive type using a piezoresistor, a strain gauge type, a servo type, a heat detection type, a gyro sensor, etc. Is applicable. Further, as the vibration sensor, a displacement sensor such as an eddy current type capable of detecting displacement, an optical type, a capacitance type, or an ultrasonic type, or a speed sensor capable of detecting a speed may be used. The noise detection sensor calculates vibration based on the detected noise level.

A stirring means 31 is provided at the lower part of the stirring tank 2. The agitation unit 31 includes an agitation blade 32 and an agitation drive unit 33 such as a motor that rotationally drives the agitation blade 32. The stirring blade 32 stirs the paper material together with the water supplied from the water supply unit 39 and performs a dissolution process. The stirring means 31 is considered to be a source of vibration. Since the vibration generating source agitating means 31 is installed in the lower part of the agitation tank 2 in this way, the agitation tank 31 is provided by installing the vibration detector 27 on the upper support 9 located at a position away from the vibration generating source. Can be detected properly.

On the bottom surface of the agitation tank 2, a waste paper pulp liquid take-out portion 37 is formed to be open at the side of the standing position of the rotation shaft 35 of the agitation blade 32. A plurality of water supply units 39 are provided on the upper wall surface of the stirring tank 2. This water supply unit 39 is connected to a tap water supply unit such as tap water by piping. When the papermaking apparatus is installed adjacent to the paper material melting apparatus 1, the water supply unit 39 may be connected to a white water tank of the papermaking apparatus via a pump or the like.

Furthermore, the paper material dissolution treatment apparatus 1 includes notifying means (not shown) for notifying the occurrence of an error or the like.

The paper material dissolution treatment apparatus 1 includes a control unit (not shown). The control unit controls to decelerate the rotation of the stirring blade 32 when the detection value of the vibration detector 27 becomes equal to or greater than a predetermined value stored in the storage unit in advance. Further, the control unit controls the rotational speed of the stirring blade 32 to return to the rotational speed before the deceleration after the detection value of the vibration detector 27 becomes equal to or higher than a predetermined value and the rotation of the stirring blade 32 is decelerated. Then, when the number of times that the detection value of the vibration detector 27 exceeds the predetermined value exceeds the predetermined number, the control unit stops the rotation of the stirring blade 32 and notifies the notification unit of an error. Furthermore, the control unit decelerates the rotation of the stirring blade when the detection value of the vibration detector 27 exceeds a predetermined value, and a predetermined time (hereinafter referred to as “supply completion time”) ta elapses from the start of the melting process. Control to be done later.

The paper material dissolution process includes a paper material supply step and a stirring step. In the paper material supply process, the control unit starts from the start of the dissolution process when the paper material is introduced into the stirring tank 2. The paper material is supplied to the stirring tank 2 over a predetermined supply completion time ta. In the agitation step, the control unit agitates the paper material and water with the agitation blade 32 over a predetermined agitation completion time tb after the supply of the paper material to the agitation tank 2 is completed, thereby dissolving the paper material. FIG. 3 shows an example of the flow of the control unit in the stirring step.

In FIG. 3, at S <b> 1, the rotation speed of the stirring blade 32 is set according to the state of the liquid in the stirring tank 2. In S2, the amount of water supplied from the water supply unit 39 is set. In the stirring step, water is intermittently supplied from the water supply unit, and the paper material adhering to the inner wall surface of the stirring tank 2 is washed away. In S2, the amount of water supplied from the water supply unit 39 is set. In S3, when the detection value of the vibration detector 27 becomes equal to or greater than a predetermined value, control for decelerating the rotation of the stirring blade 32 is performed. The predetermined value is a value for determining whether the liquid in the agitation tank 2 contains air or that the agitation is performed in a state where foreign matter is mixed in, and is obtained in advance by an experiment. For example, when the vibration detector 27 is an acceleration sensor, the predetermined value can be set within a range of 1G to 10G.

In S4, it is determined whether or not the stirring elapsed time tc, which is the time elapsed from the start of the stirring process, has exceeded a preset stirring completion time tb. When the stirring elapsed time tc is equal to or shorter than the stirring completion time tb, the process returns to S1. When the stirring elapsed time tc exceeds the stirring completion time tb, it is determined that the dissolution of the paper material has been completed, and the process ends.

FIG. 4 shows a detailed flow of processing when the detection value of the vibration detector 27 in S3 in FIG. In S11 of FIG. 4, after the detection value of the vibration detector 27 becomes equal to or greater than a predetermined value, a detection duration time indicating the time when the state where the detection value becomes equal to or greater than the predetermined value is continuously detected at the detection timing of the control unit It is determined whether td is equal to or longer than a predetermined detection completion time te. The detection completion time te is set so that the stirring blade 32 is not decelerated when the detection value of the vibration detector 27 is not less than a predetermined value.

When the detection value of the vibration detector 27 is not single-shot and continuously exceeds the detection completion time te and becomes a predetermined value or more, the control unit is in a state where the liquid in the stirring tank 2 contains air, It is determined that stirring is performed in a state where foreign matter is mixed. The detection completion time te is obtained and set in advance by experiments. Specifically, the detection completion time te has a length of, for example, 2 seconds. When the detection continuation time td is shorter than the detection completion time te, the control unit determines that the vibration detector 27 has become a predetermined value or more in a single shot, and ends. If the detection duration td is equal to or longer than the detection completion time te, the process proceeds to S12.

In S12, it is determined whether or not the remaining time tf obtained by subtracting the stirring elapsed time tc from the stirring completion time tb is equal to or longer than a predetermined remaining limit time tg. The remaining limit time tg can be set to a value such as 3 seconds, for example. If the remaining time tf is not longer than the remaining limit time tg and does not satisfy S12, the process ends. That is, when the paper material is sufficiently dissolved and the remaining time tf obtained by subtracting the stirring elapsed time tc from the stirring completion time tb is shorter than the remaining limit time tg, the stirring blade 32 is terminated without decelerating. And As a result, the stirring blade 32 continues the stirring operation while maintaining the rotation speed at the time of vibration detection. If the remaining time tf is longer than the remaining limit time tg in S12, the process proceeds to S13.

In S13, is the number of times (hereinafter referred to as “the number of times of deceleration”) na decelerated of the stirring blade 32 in the stirring process after the start of the paper material dissolution processing equal to or greater than a predetermined number of times (hereinafter referred to as “the number of times of deceleration limit”) Judgment is made. When the speed reduction process of the stirring blade 32 is performed a plurality of times in the stirring step, the air contained in the liquid stirred in the stirring tank 2 usually floats on the liquid surface and then disappears. As a result, the liquid in the agitation tank 2 can be properly agitated without containing air, and the dissolution process can proceed smoothly. However, if foreign matter is mixed in the stirring tank 2, even if the stirring blade 27 is decelerated a plurality of times, the vibration of the stirring tank 2 is not cured, and the detection value of the vibration detector 27 continues to be predetermined. More than the value. Therefore, a deceleration limit number nb which is an upper limit value of the number of decelerations na is provided. When the number of times of deceleration na becomes equal to or greater than the number of times of deceleration limit nb, the control unit determines that foreign matter is mixed in the agitation tank 2. And it progresses to S16 and a control part stops the stirring blade 32. FIG. Further, in S17, the control unit notifies the notification unit of the error.

In S13, when the number of times of deceleration na is smaller than the number of times of deceleration limit nb and S13 is not satisfied, the process proceeds to S14. In S14, 1 is added to the count of the number of times of deceleration na. In S15, the stirring blade 32 is gradually decelerated over a predetermined time (hereinafter referred to as “deceleration time”) th, and is stopped for a predetermined stop time ti. Thereafter, the rotation of the stirring blade 32 is resumed, accelerated over the acceleration time tk, returned to the rotational speed before the deceleration, and the process ends. The time required for the deceleration processing of the stirring blade 62 (hereinafter referred to as “deceleration processing time”) tj, which is the sum of the deceleration time th, the stop time ti, and the acceleration time tk, is about 3 seconds, for example.

When the detected value of the vibration detector 27 becomes equal to or greater than the predetermined value and the control unit decelerates the rotation of the stirring blade 32 and then restarts the rotation of the stirring blade 32, the rotation direction of the stirring blade 32 is the same direction as before the deceleration. Or in the opposite direction. Further, the deceleration processing time tj of the stirring blade 32 is subtracted from the stirring elapsed time tc. Accordingly, the deceleration processing time of the stirring blade 32 is not included in the stirring elapsed time tc. Therefore, the time for stirring the stirring blade 32 at a predetermined rotational speed for the dissolution process is ensured regardless of whether or not the deceleration process is performed.

The operation of the paper material dissolution treatment apparatus 1 according to the present embodiment will be described below.
First, a paper material such as waste paper on which confidential information, personal information, etc. is written is put into the agitation tank 2. When the paper material is loaded, the lid 12 is slid in the lateral direction by the moving means 15. Then, the paper material is introduced from the upper part of the opened stirring tank 2. The input paper material is agitated by the agitating blade 32 in the agitating tank 2 together with the water supplied from the water supply unit 39, and is dissolved. At this time, the paper material put into the agitation tank 2 may be one that has not been shredded to a standard size, or one that has been shredded using a known shredder device.

Moreover, the weight of the paper material thrown into the stirring tank 2 may be measured by a known weight measuring device, and the ratio with the water supplied from the water supply unit 39 may be adjusted. When the paper material dissolution processing apparatus 1 according to the present invention is used as part of a used paper recycling processing apparatus for producing recycled paper from used paper, the weight of the paper material is measured and the mixing ratio with water from the water supply unit By adjusting the, the quality such as the thickness of the recycled paper obtained can be maintained at a certain level.

The paper material may be automatically supplied using a paper material conveying device such as a blower or a duct, or may be manually input by a user. Further, the paper material and water may be supplied at a time in an amount necessary for one dissolution treatment, or may be supplied intermittently by being divided into a plurality of times. In the case where the paper material and water are supplied intermittently, the paper material and water are quickly adapted to each other, and as a result, the dissolution processing time can be shortened.

The rotation of the stirring blade 32 is gradually accelerated from the start of the paper material and water supply. While the paper material and water are being supplied from the start of the dissolution of the paper material until the predetermined supply completion time ta elapses, the paper material and the water are difficult to adjust and the vibration of the agitation tank 2 tends to increase. On the other hand, when the supply of the paper material is completed and the dissolution of the paper material proceeds, normally, the viscosity of the liquid in the agitation tank 2 increases and the state becomes stable, and the agitation is performed as compared with the supply of the paper material. The vibration of the tank 2 tends to be small.

As described above, in the paper material supply process, the cause of the vibration of the stirring tank 2 is not air or foreign matter mixed into the liquid in the stirring tank 2 but mainly because the paper material and water are not so familiar. When the supply completion time ta elapses and the familiarity between the paper material and water gradually increases, the stirring tank 2 does not vibrate significantly. Thus, in the paper material supply process, the detection value of the vibration detector 27 is usually a predetermined value or more, and it is considered that there is not much relation to the mixing of air or foreign matter into the liquid in the stirring tank 2. Therefore, the control unit does not decelerate the stirring blade 32 even if the detection value of the vibration detector 27 becomes a predetermined value or more. Then, after a predetermined supply completion time ta has elapsed from the start of the paper material melting process, when the detection value of the vibration detector 27 becomes equal to or greater than a predetermined value, the rotation of the stirring blade 32 is decelerated.

In the agitation step, when the liquid in the agitation tank 2 is agitated while containing foreign substances that are difficult to dissolve, such as air and film, the viscosity of the liquid in the agitation tank 2 is difficult to increase and the state is not good. Stable and less likely to reduce vibration. In such a case, the detection value of the vibration detector 27 is equal to or greater than a predetermined value set in advance. On the other hand, the control unit determines whether or not the detection continuation time td at which the detection value of the vibration detector 27 continues to be equal to or greater than the predetermined value is equal to or greater than the predetermined detection completion time te. When the detection continuation time td becomes equal to or longer than the detection completion time te, the control unit determines whether the remaining time tf is equal to or longer than a predetermined remaining limit time tg. When the remaining time tf is equal to or longer than the remaining limit time tg, the control unit determines whether or not the number of decelerations na is equal to or greater than a predetermined number of deceleration limit nb.

When the deceleration number na is equal to or greater than the deceleration limit number nb, the control unit increases the count number of the deceleration number na by one. The control unit controls the stirring driving unit 33 to decelerate the rotation of the stirring blade 32 over a predetermined deceleration time th, and then stops for a predetermined stop time ti. Thereby, the air contained in the liquid in the stirring tank 2 and deteriorating the stirring state can be raised to the liquid level and eliminated. Therefore, the paper material is sufficiently brought into contact with the stirring blade 32 without being obstructed by the air, and is cut and the dissolution process proceeds properly.

After the stirring blade 32 is stopped, the stirring driving unit 33 is driven to restart the rotation of the stirring blade 32, and the rotational speed is returned to the pre-deceleration speed over a predetermined acceleration time tk. At this time, the control unit may rotate the stirring blade 32 in the same direction as before deceleration or in the reverse direction. By making it a reverse direction, the air contained in the stirring tank 2 can be removed more efficiently.

When the detection value of the vibration detector 27 is equal to or greater than a predetermined value and the number of times of deceleration na for decelerating the rotation of the stirring blade 32 is equal to or greater than the predetermined number of times of deceleration limit nb, the control unit controls the stirring drive unit 33. The rotation of the stirring blade 32 is stopped. Also, an error is notified to the notification means. Thereby, when the foreign substance which is hard to melt | dissolve is mixed in the liquid in the stirring tank 2, stirring processing can be complete | finished.

Therefore, even if the agitation blade 32 is repeatedly decelerated, the proper rotation of the agitation blade 32 continues to be hindered by foreign matter, resulting in incorrect rotation, and air is more likely to be mixed into the liquid, reducing vibration. If the noise is generated, the melting process can be terminated. And an alerting | reporting means alert | reports an error and can alert | report the presence of the foreign material in the stirring tank 2 with respect to a user. Therefore, for example, when foreign matter is transported to a processing device for processing a paper solution such as a subsequent deinking device or paper making device, the electromagnetic valve or pump may be clogged or the subsequent processing device may be damaged. Can be prevented.

In the above-described embodiment, the control unit of the paper material dissolution processing apparatus 1 stops the rotation after the detection value of the vibration detector 27 is equal to or greater than a predetermined value, decelerates the rotation of the stirring blade 32, and then decelerates. Although the control to return to the previous rotation speed is performed, the present invention is not limited to this, and the stirring blade may not be stopped. Further, the rotational speed after deceleration may be maintained without returning to the original rotational speed after deceleration. In addition, when the number of times of deceleration na at which the detection value of the vibration detector 27 is equal to or greater than the predetermined value becomes equal to or greater than the predetermined number of times of deceleration limit nb, the control unit stops the rotation of the stirring blade 32 and gives an error to the notification unit. However, even if the predetermined number of times is exceeded, the rotation of the stirring blade 32 may be continued without stopping, and the error to the notification means may not be notified.

Further, the control unit controls the rotation of the agitating blade 32 to be reduced after a predetermined time has elapsed since the start of the paper material dissolution process when the detection value of the vibration detector 27 becomes equal to or greater than the predetermined value. Immediately after starting the melting process of the material, the rotation of the stirring blade may be decelerated when the detection value of the vibration detector becomes a predetermined value or more. The predetermined supply completion time ta, stirring completion time tb, detection completion time te, remaining limit time tg, deceleration limit number nb, deceleration time th, stop time ti, and acceleration time tk are obtained by experiments and controlled in advance. However, each of these values may be changed according to the usage status of the paper material dissolution processing apparatus.

DESCRIPTION OF SYMBOLS 1 Dissolution processing apparatus 2 Agitation tank 27 Vibration detector 32 Agitation blade 39 Water supply part

Claims (10)

A stirrer equipped with a stirring blade that stirs paper material together with water supplied from the water supply unit and performs a dissolution treatment;
A vibration detector for detecting the vibration of the stirring tank;
A paper material dissolution processing apparatus, comprising: a control unit that controls to decelerate rotation of the stirring blade when a detection value of the vibration detector becomes a predetermined value or more. 2. The paper according to claim 1, wherein the control unit rotates the stirring blade in a direction opposite to that before the deceleration after the detection value of the vibration detector becomes equal to or greater than a predetermined value and decelerates the rotation of the stirring blade. Material melting treatment equipment. The control unit returns the rotational speed of the stirring blade to the rotational speed before deceleration after the detection value of the vibration detector becomes equal to or greater than a predetermined value and decelerates the rotation of the stirring blade. 2. The paper material dissolution treatment apparatus according to 2. 2. The control unit according to claim 1, wherein when the number of times that the detection value of the vibration detector is equal to or greater than the predetermined value exceeds the predetermined number, the control unit stops the rotation of the stirring blade and notifies the notification unit of an error. The paper material dissolution treatment apparatus according to any one of claims 3 to 3. The control unit controls to reduce the rotation speed of the stirring blade when the detection value of the vibration detector becomes equal to or greater than a predetermined value, after a predetermined time has elapsed from the start of the paper material melting process. The paper material dissolution treatment apparatus according to any one of claims 1 to 4. When the paper material is stirred together with the water supplied from the water supply unit by the stirring blade in the stirring tank and the paper material is dissolved, the vibration of the stirring tank is detected by a vibration detector,
A paper material dissolution treatment method, comprising: decelerating the rotation of the stirring blade when the detection value of the vibration detector is equal to or greater than a predetermined value. 7. The paper material dissolution process according to claim 6, wherein the detection value of the vibration detector becomes equal to or greater than a predetermined value, and after the rotation of the stirring blade is decelerated, the stirring blade is rotated in a direction opposite to that before the deceleration. Method. 8. The paper according to claim 6, wherein the detection value of the vibration detector becomes equal to or greater than a predetermined value and the rotation of the stirring blade is decelerated, and then the rotation of the stirring blade is returned to the rotational speed before the deceleration. Method of melting material. 9. The method according to claim 6, wherein when the number of times that the detection value of the vibration detector exceeds a predetermined value exceeds the predetermined number, the stirring blade is stopped and an error is notified to the notification means. The paper material dissolution treatment method according to claim 1. 10. The method according to any one of claims 6 to 9, wherein the rotation of the agitating blade is reduced when the detection value of the vibration detector becomes equal to or greater than a predetermined value, after a predetermined time has elapsed from the start of the paper material dissolution process. The paper material dissolution treatment method according to claim 1.

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