JP6945811B2 - Deinking device and used paper recycling device - Google Patents

Description

The present invention relates to a used paper recycling processing apparatus and is a technique relating to a treatment of deinking and draining liquid.

In a conventional waste paper recycling apparatus, an ink or toner containing a surfactant or other deinking agent is added to the pulp solution in the deinking tank, air bubbles are supplied from below the deinking tank, and the ink or toner contained in the pulp solution is floated. Etc. are suspended and separated. The ink, toner, etc. contained in the pulp solution adhere to the bubbles and become bubbles that float on the liquid surface of the deinking tank, and the foamy deinking drainage is deinked from the deinking tank to the outside of the deinking tank. Discharge as.

The amount of foam generated depends on the properties of the pulp mixture, but changes depending on the increase or decrease in the amount of air supplied as bubbles to the deinking tank. When the amount of foam generated is large, the amount of air bubbles released is excessive and the amount of pulp fibers contained in the deink drainage is large. Cannot be sufficiently removed, and black spots occur on the recycled paper that has been made.

For this reason, for example, in the one described in Patent Document 1, the deinking tank of the deinking device is provided with a lid that changes under the pressing force of bubbles overflowing from the opening at the top to the outside of the deinking tank. Based on the opening position of the body, the overflow flow rate of the bubbles overflowing from the opening to the outside is grasped, and the deinking state in the deinking tank is determined from this overflow flow rate.

In addition, the amount of deinking liquid discharged from the deinking tank to the outside of the tank as deinking bubbles and then discarded in the drainage tank is measured as the amount of loss, and the amount of bubbles released to the deinking tank is controlled using this amount of loss as an index. There is also a way to do it.

Japanese Unexamined Patent Publication No. 2011-38206

For the measurement of the amount of loss, it is preferable to directly measure the amount of deinked drainage. However, since the deink drainage is discharged as bubbles, it is difficult to directly measure the amount of bubbles using a sensor or the like.

For this reason, the foamy deinked drainage (deinked foam) discarded in the drainage tank is transferred to the settling tank as wastewater after defoaming treatment, etc., and the amount of transfer and the time required for transfer are simulated. It was treated as a loss amount and used as an index to control the amount of bubbles generated in the deinking tank.

However, since drainage also flows into the drainage tank from other routes, it is necessary to calculate and subtract the amount of drainage that flows in from other routes, which complicates the calculation and increases the time required to obtain the measurement result. There was a problem.

In order to solve the above problem, the deinking device according to claim 1 uses a deinking tank for deinking a pulp solution formed by decoupling used paper and deinking bubbles for deinking drainage generated in the deinking tank. In a deinking device equipped with a deinking foam collection / discharge unit that collects and discharges
The deinking tank is provided with a bubble discharging device for discharging bubbles into the pulp solution in the deinking tank, and further includes an air supply device for supplying air to the bubble releasing device.
The deinking foam collecting / discharging unit includes a defoam receiving unit for dropping deinking bubbles and a scratching unit that moves in the deinking tank and attracts deinking bubbles floating on the liquid surface in the deinking tank to the deinking unit. It has a gathering member and a scraping member driving unit that drives the scraping member, and the foam receiving portion includes a receiving portion that receives the deinked bubbles that are scraped by the scraping member, and deinking on the receiving portion. It has a deinking bubble detecting unit that detects the amount of bubbles generated, and a deinking foam discharging unit that receives the deinking foam b on the receiving unit and discharges it to the outside of the deinking tank via a discharge path. The deinking bubble detection unit is installed facing above the receiving unit to irradiate light and receive the incident light, and the receiving unit receives the light emitted from the optical sensor. It is characterized in that it is configured to be reflective on the surface of the receiving portion, and is provided with a determination means for determining the amount of deinked bubbles generated by detecting the light reflected on the surface of the receiving portion by an optical sensor. It is a thing.

Further, in the invention according to claim 2, in the deinking apparatus according to claim 1, the deinking foam collecting / discharging portion has a defoam receiving portion that opens in the deinking tank and drops the deinked foam. The scraping member is configured to scrape the deinking bubbles floating on the liquid surface in the deinking tank to the foam receiving portion, and the scraping member driving unit rotates the scraping member. It is characterized by being driven.

The invention according to claim 3 is the deinking apparatus according to claim 2, wherein the deinking tank has a double cylindrical body, and the inside of the inner wall of the double cylindrical body. It is characterized in that the discharge path for the deinked foam is integrally provided in the.

Further, the invention according to claim 4 is the deinking apparatus according to claims 1 to 3.
It is characterized by including a control unit that controls the air supply amount of the air supply device according to the determined amount of deinked bubbles generated.

Further, the invention according to claim 5 is the deinking apparatus according to claim 1 or 4.
Further equipped with a surfactant charging means for charging the surfactant into the deinking tank,
It is characterized by including a control unit that controls the amount of the surfactant charged into the deinking tank according to the determined amount of deinking bubbles generated.

Further, the invention according to claim 6 is the case where the amount of the determined deinking bubbles generated is small in the deinking device according to claim 5, and the air supply amount of the air supply device is increased to the maximum value. It is characterized in that the surfactant is added to the deinking tank only when the amount of deinking bubbles generated does not become an appropriate amount even if the amount is increased.

Further, the invention according to claim 7 is the deinking apparatus according to claims 1 to 6.
In the deinking bubble detection unit, a plurality of optical sensors are arranged so that the light irradiation positions with respect to the receiving unit are different, and the deinking bubble can be detected by combining the presence or absence of deinking bubble detection by the plurality of optical sensors. It is characterized in that the amount of generation is determined.

Further, the invention according to claim 8 is the deinking apparatus according to claims 1 to 7.
It is equipped with a liquid level detection unit that detects the reference liquid level of the pulp solution in the deinking tank, and when the reference liquid level is detected, it drives a scraping member to remove floating on the liquid surface in the deinking tank. After the ink bubbles are attracted to the bubble receiving portion, the amount of the deinked bubbles generated is determined by the determination means in the deinked bubble detecting unit.

Further, the invention according to claim 9 is the deinking apparatus according to claims 1 to 8.
The receiving portion is characterized in that it is inclined downward toward the deinking bubble discharge opening.

Further, the invention according to claim 10 is the deinking apparatus according to claims 1 to 9.
Above the receiving portion, a cleaning liquid supply portion for flushing the received deinked foam to the deinked foam discharge opening is provided.

Further, the invention according to claim 11 is characterized by comprising an adjusting means for adjusting the amount of cleaning liquid supplied by the cleaning liquid supply unit to be larger than that during normal operation at least when the operation is interrupted or the operation is terminated. It is something to do.

Further, the invention according to claim 12 is characterized in that the optical sensor is a laser type photoelectric sensor.

Further, the invention according to claim 13 is characterized in that the laser spot light is set so as to have a diameter of 5 mm or less on the surface of the receiving portion.

Further, the invention according to claim 14 is a used paper recycling apparatus including the deinking apparatus according to any one of claims 1 to 12.

As described above, according to the present invention, it is possible to detect the operating state of the deinking process in the deinking portion with a simple configuration and control it efficiently. Furthermore, by arranging the device configuration for scraping the deinking bubbles in the deinking tank, the device configuration can be further simplified, which can contribute to the miniaturization of the used paper recycling processing device.

Further, since the deinking bubble collecting / discharging unit arranged in the deinking tank is provided with a receiving unit for receiving the deinking foam and a deinking bubble detecting unit for detecting the amount of the received deinking foam generated, the above. Based on the detected distribution of deinked bubbles on the receiving unit, the amount of deinked bubbles generated in the deinking tank can be easily (simplely) determined.

Further, in the deinking bubble detection unit, by using a laser type photoelectric sensor as an optical sensor, the beam is sharp and the focal length can be long, so that the sensor detection surface is sufficiently above the liquid surface of the deinking tank. It is possible to prevent the sensor detection surface from becoming dirty due to the scattering of the pulp solution from the liquid surface. Further, since the irradiation range of the laser spot light is a small range on the surface of the receiving portion, the irradiation position of the laser spot light can be easily adjusted.

Further, in the deinking bubble detection unit, if the light emitted from the optical sensor (photoelectric sensor) is dispersed (absorbed) by the deinking foam on the receiving unit and the reflected light is not received by the optical sensor, a predetermined value is specified. By determining that the deinking bubbles have been detected at the detection position, the presence or absence of the deinking bubbles at the predetermined detection position can be stably detected. Further, by using the judgment result, the amount of deinking bubbles generated in the deinking portion can be determined in a pseudo manner, and the generation of deinking bubbles in the deinking portion, which is difficult to measure directly, can be determined. The amount can be detected and determined with a simple configuration.

Block diagram which shows the used paper recycling processing apparatus in embodiment of this invention Perspective view of the deinking device in the same embodiment Top view showing the AA cross-sectional position of the deinking apparatus in the same embodiment. Cross-sectional view taken along the line AA of FIG. The flow chart which shows the operation of the deinking bubble b determination means in embodiment of this invention. Top view showing the light irradiation position with respect to the receiving part 552 in the same embodiment. A data table that defines the correlation between the detection result of deinking bubble b in the same embodiment and the control corresponding to the result. The figure which shows the detection state of the deinking bubble b on the receiving part in embodiment of this invention. The figure which shows the detection state of the deinking bubble b on the receiving part in embodiment of this invention. The figure which shows the detection state of the deinking bubble b on the receiving part in embodiment of this invention. The figure which shows the detection state of the deinking bubble b on the receiving part in embodiment of this invention. The figure which shows a plurality of shower nozzles installed above the receiving part in embodiment of this invention. Cross-sectional view of the deinking device according to another embodiment of the present invention. Cross-sectional view of the deinking device according to another embodiment of the present invention. The figure which shows the detection state of the deinking bubble b on the receiving part in another embodiment of this invention.

(Overall configuration of used paper recycling equipment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the recycled paper recycling apparatus has a plurality of processing units constituting the waste paper recycling processing system, and the processing units include a waste paper input unit 1, a pulper unit 9, a deinking unit 11, and a papermaking unit. There are 13 parts, 14 drying parts, 15 finishing parts, 63 paper receiving parts, and 100 white water tank parts. Further, the used paper recycling processing apparatus includes a control unit 700 that controls the operation of each processing unit.

The used paper charging section 1 throws recycled paper as a recycled material into the pulper section 9, and throws the used paper into the pulper section 9 in the state of being a sheet of paper or in a cut state. The pulper portion 9 has a tank body 91 and a stirring device 92 provided in the tank body 91, and dissociates used paper to produce a pulp solution containing recycled pulp.

The deinking unit 11 prepares deinked pulp by deinking the pulp solution, and has a deinking tank 501, a bubble releasing device 601 that discharges bubbles from the bottom of the deinking tank 501, and a bubble releasing device 601. It has an air supply device (air pump, etc.) 602 that supplies air to the ink. The bubble release device 601 is arranged at the bottom of the deinking tank 501 and is composed of a breathable porous air stone or the like, and the upper surface is formed as a bubble release surface.

The papermaking section 13 is used to dehydrate the pulp mixture deinked in the deinking section 11 to produce wet paper. The drying unit 14 dries the dehydrated wet paper into recycled paper.
The finishing portion 15 performs a finishing step on the recycled paper, and discharges the obtained recycled paper to the paper receiving unit 63.
The white water tank unit 100 stores white water, which is wastewater containing recycled pulp flowing from the papermaking unit 13, and returns the white water to various parts of the recycled paper recycling treatment system through the white water return systems 105 and 106. A water supply source, here, a water supply pipe 108 for supplying water from a clean water pipe 107, is connected to a white water tank 100, and the water supply pipe 108 is provided with a main valve device 109 for emergency stop including an electromagnetic valve.

(First Embodiment of the deinking part)
The deinked portion in the first embodiment of the present invention will be specifically described with reference to FIGS. 2 to 4. FIG. 2 is a perspective view of the deinking device as viewed from the front, FIG. 3 is a plan view of the deinking device as viewed from above, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. .. For convenience of explanation, FIG. 2 is shown by cutting out a part of the outer wall 541 of the deinking tank 501.

In the present embodiment, the deinking unit 11 forming the deinking device has a characteristic structure for realizing miniaturization of the used paper recycling processing device.

In FIGS. 2 to 4, the deinking portion 11 has a deinking tank 501 in which the tank body forms a double cylindrical body, and the double cylindrical body arranged in the vertical direction is between the outer wall 541 and the inner wall 542. Is formed as a space inside the deinking tank 501, and a deinking bubble discharging portion 550 for discharging the deinking foam b to the outside of the deinking tank 501 is provided inside the inner wall 542 of the double cylindrical body. This structure simplifies the device.

The deinking tank 501 is provided with a pulp solution inflow portion 502 that communicates with the space inside the deinking tank 501 on the side portion of the tank body. The pulp solution inflow section 502 receives the pulp solution discharged from the pulper section 9 via the pulp solution discharge section 505. Further, a bubble release device 601 made of a breathable porous air stone or the like is arranged at the bottom of the deinking tank 501, and the upper surface is formed as a bubble release surface. Further, an air supply device (air pump or the like) 602 for supplying air to the bubble discharge device 601 is provided. In FIGS. 2 to 4, the bubble release device 601 and the air supply device 602 are omitted.

The deinking tank 501 has an opening portion 507 in a part of the outer wall 541 of the double cylindrical body in the circumferential direction, and in the circumferential direction of the outer wall 541, between the outer wall 541 and the inner wall 542 on the left and right sides of the opening portion 507. Termination walls 508 and 509 that are closed to form the tank wall of the deinking tank 501 are provided, and a foam receiving portion 551 having a deinking foam discharging portion 550 is provided above the opening portion 507.

The bubble receiving portion 551 that drops the deinking foam b is a scraping member 556 that scrapes the deinking bubble b generated in the deinking tank to the foam receiving portion 551, and a scraping member that drives the scraping member 556. A drive unit (not shown) is further provided to form a deinked foam collection / discharge unit 555.

The scraping member 556 is composed of a scraping blade 5562 that scrapes the deinking bubble b and a support member 5651 that supports the scraping blade 5562. The scraping blade 5562 is made of a flexible material such as synthetic resin or rubber. The support member 5651 is fixed to the rotation drive shaft 23, and rotates together with the scraping blade 5562 as the rotation drive shaft 23 rotates. Due to the rotation of the scraping blade 5562, the deinking bubbles b are swirled in one direction (a direction) above the end walls 508 and 509 of the bubble receiving portions 551 inside the deinking tank 501, and the deinking bubbles b are formed on the end walls 508 and 509. It is scraped to the bubble receiving portion 551 between them.

As shown in FIG. 4, a light-shielding plate 563 is integrally provided on the rotation drive shaft 23, and a detection sensor 564 such as a photo interrupter is provided on the rotation locus of the light-shielding plate 563.
The position where the detection sensor 564 is blocked by the light-shielding plate 563 is the home position position of the scraping member 556, and the scraping member driving unit (not shown) rotates the scraping member 556 together with the rotation drive shaft 23 based on that position. Drive.

According to the above configuration, the tank body of the deinking tank forms a double cylindrical body, and the deinking bubble b discharge path is integrally provided inside the inner wall of the double cylindrical body to remove the deinking bubbles. It is possible to more efficiently scrape the ink bubble b to the bubble receiving portion 551 without missing it. Further, the deinking foam b can be stably attracted to the foam receiving portion only by rotating the scraping member 556 in one direction, and the drive mechanism can be easily configured.

The bubble receiving portion 551 is separated from the opening portion 507 by the receiving portion 552, separated from the deinking tank 501 by the terminal walls 508 and 509, and the inner edge portion of the receiving portion 552 having a fan shape in a plan view is separated from the inner wall 542. The bubble receiving portion 551 projects inward and communicates with the inner space of the inner wall 542 of the double cylindrical body.

The foam receiving unit 551 includes a receiving unit 552 that receives the deinked bubbles b scraped by the scraping member 556, and a deinking bubble detecting unit 603 that detects the amount of deinked bubbles b generated on the receiving unit. The deinked foam discharging unit 550 receives the deinked foam b on the receiving unit and discharges the deinked foam b to the outside of the deinking tank via the discharge path.

The deinking bubble detection unit 603 is installed facing above the receiving unit 552, and the optical sensors 25 and 26 that irradiate light and receive incident light, and the receiving unit 552 are the optical sensor 25. , 26 is configured to be able to reflect the light emitted from the receiving portion 552 on the surface of the receiving portion 552, and the amount of deinking bubbles b generated is determined by detecting the light reflected on the surface of the receiving portion 552 with an optical sensor. A determination means (not shown) for determining is provided.

As the optical sensors 25 and 26, it is preferable to use a laser type photoelectric sensor. By using a laser type photoelectric sensor, the beam is sharp and the focal length can be long, so the sensor detection surface can be sufficiently separated from the liquid level of the deinking tank, and it can be seen from the liquid level of the deinking tank. It is possible to prevent the sensor detection surface from becoming dirty due to the scattering of the pulp solution. Further, since the irradiation range of the laser spot light is a small range on the surface of the receiving portion, the irradiation position of the laser spot light can be easily adjusted. More preferably, if a guide member having a hole on the optical axis of the photoelectric sensor to allow the laser spot light to escape is provided, it is more effective to stain the sensor detection surface due to the scattering of the pulp solution from the liquid surface of the deinking tank. Can be prevented.

Further, by setting the laser spot light to have a diameter of 5 mm or less on the surface of the receiving portion, the sensor detection surface can be sufficiently separated from the liquid surface of the deinking tank, and the laser spot light is irradiated. The position can be adjusted accurately.

According to the deinking device having the above configuration, the following effects can be exhibited.

Since the deinking bubble collection / discharging unit 555 is provided with a receiving unit 552 that receives the deinking bubble b and a deinking bubble detecting unit 603 that detects the amount of the received deinking bubble b generated, the detected receiving unit 552. Based on the distribution of the deinking bubbles b above, the amount of deinking bubbles b generated in the deinking tank 501 can be easily (simplely) determined.

(Action of deinking part)
Next, the operation of the deinking unit 11 described above will be described. As shown in FIG. 2, the pulp solution that has flowed from the pulp solution inflow section 502 into the tank space of the deinking tank 501 is transferred while passing over a plurality of partition plates (not shown) radially formed in the tank space. In the meantime, impurities of solid components such as ink are separated together with the deinked bubbles b by the fine bubbles scattered from the bubble discharging device 601, and the deinked pulp solution is transferred from the tank outlet 506 to the paper making section 13.

As shown in FIG. 4, the scraping member drive unit (not shown) rotationally drives the rotary drive shaft 23 to drive the scraping member 556 inside the deinking tank 501 to the end walls 508 and 509 of the bubble receiving portion 551. The upper part is swiveled in one direction (direction a in FIG. 3) from the home position position to the home position position, and the deinked bubble b is scraped onto the receiving part 552 in the bubble receiving part 551 between the end walls 508 and 509. The deinking bubble b scraped onto the receiving unit 552 is transferred to the deinking bubble discharging unit 550 that receives the deinking bubble b on the receiving unit 552 and discharges it to the outside of the deinking tank via the discharge path. NS.

(Water level control in the deink tank)
Next, the water level control of the deinking tank 501 will be described below.

The amount of the pulp solution supplied from the pulper unit 9 to the space inside the deinking tank 501 via the pulp solution discharge unit 505 is controlled by using the upper limit detection sensor 605. As the upper limit detection sensor 605, for example, two conductive sensors (electrodes) as shown in FIG. 2 or FIG. 3 are used, and when the water level of the pulp solution reaches between the two sensors (electrodes), a current is applied between the two electrodes. It is detected that the pulp solution has reached a predetermined upper limit water level (reference liquid level) when the flow becomes conductive.

The amount of the pulp solution supplied to the tank space of the deinking tank 501 is detected by the upper limit detection sensor 605 attached to the pulp solution inflow portion 502 communicating with the tank space. The upper limit detection sensor 605 can be directly attached to the circular surface of the deinking tank 501 for detection, but it is better to provide a separate chamber called the pulp solution inflow section 502 for detection without the liquid level rippling. Stabilize. Further, since the surface of the pulp solution inflow portion 502 is flat, it is easier to attach than directly attaching to the circular surface of the deinking tank 501.

In the used paper recycling apparatus of this embodiment, the deinking tank 501 is started from the upper limit water level in which the upper limit detection sensor 605 is in the detection state, and after the operation is started, the pulper unit 9 puts pulp into the deinking tank 501 in a timely manner. While replenishing the solution, the pulp solution deinked by the deinking unit 11 is controlled to continue to be transferred from the deinking tank 501 to the paper making unit 13. When the amount of storage in the deinking tank 501 decreases by 1.5 L from the upper limit water level, the supply to the deinking tank 501 is started from the pulper unit 9, and when the upper limit detection sensor 605 detects the upper limit water level again, the pulper unit 9 starts supplying. Supply will be stopped. After that, the same operation is repeated.

(Control based on the judgment means and judgment result of deinking bubbles)
As a means for easily determining the operating state of the deinking process in the deinking unit 11, the deinking foam collecting / discharging unit 555 rotates the receiving unit 552 that receives the deinking foam b and the scraping member 556 at a predetermined timing. The deinking bubble detection unit 603 for detecting the distribution of the deinking bubbles b received on the receiving unit 552 is provided, and the operating state of the deinking process is based on the distribution of the deinking bubbles b on the detected receiving unit 552. The amount of deinking bubbles b generated in the deinking tank (whole) can be estimated and determined.

In detecting the distribution of the deinked bubbles b received on the receiving unit 552, the position of the light irradiation by the optical sensors 25 and 26 on the receiving unit 552 is an important point in determining the distribution of the deinked bubbles b. It becomes. In the embodiment, as shown in FIG. 6, the light irradiation positions of the receiving portions 552 by the optical sensors 25 and 26 are set at two points, A point and B point.
In FIG. 6, the scraping member 556 shows the home position position where the detection sensor 564 is blocked by the light-shielding plate 563, and the scraping member 556 is rotated once each time based on the home position position at a predetermined timing to receive the receiving portion. The deinking bubble b is discharged onto the 552.

As for the setting of the light irradiation position for the receiving portion 552, the bubble for detecting the deinking bubble b (the deinking bubble b blocks the light irradiation) when the light irradiation position is set farther from the scraping member 556 than the home position position. Requires a large amount of generation. Further, in the fan-shaped receiving portion 552, the one set on the outer peripheral portion rather than the inner peripheral portion (the side closer to the rotation drive shaft 23) requires a larger amount of bubbles to be generated for detecting the deinking bubbles b. That is, in FIG. 6, the point B requires a larger amount of bubbles to detect the deinked bubbles b than the point A. As the optical sensors 25 and 26, for example, as shown in FIG. 4, one set of a light emitting side sensor and a light receiving side sensor is housed in one package.

As described above, in the deinking bubble detection unit 603, a plurality of optical sensors are arranged so that the light irradiation positions with respect to the receiving unit 552 are different, and the deinking bubble b detection by the plurality of optical sensors 25 and 26 is performed. Based on the combination of presence / absence (distribution of bubbles), the amount of deinked bubbles b generated in the deinking tank as the operating state of the deinking process is determined. The optical sensor is not limited to one set / one package x 2 of the light emitting side sensor and the light receiving side sensor, and only one set / one package x one of the light emitting side sensor and the light receiving side sensor may be arranged. In that case, it is possible to appropriately determine the amount of bubbles generated by considering the setting of the light irradiation position described above. Further, the optical sensor may be installed in a set of a light emitting side sensor and a light receiving side sensor / package x 3 or more. In that case, it becomes possible to determine the distribution of bubbles in more detail. Further, in this embodiment, as the optical sensor, one set of the light emitting side sensor and the light receiving side sensor is housed in one package, but the light emitting side sensor and the light receiving side sensor are housed in one package. You may use the ones that are separate without each other.

Next, the above-mentioned deinking bubble b determination means will be described more specifically based on the flowchart shown in FIG.
(1) While the upper limit detection sensor 605 does not detect the upper limit water level of the deinking tank 501, the scraping member 556 is not rotated and the deinking bubble b is not determined (S1). When the upper limit detection sensor 605 detects the upper limit water level (S1), the scraping member 556 is rotated once from the home position position to the home position position, and the deinking bubble b is scraped onto the receiving portion 552 (S2).

The water level of the deinking tank 501 is controlled based on the water level control of the deinking tank 501 described above. In the water level control, the scraping member 556 is rotated and received each time the upper limit detection sensor 605 detects the upper limit water level. The distribution of the deinking bubble b received on the part 552 is detected. At the upper limit water level, the deinking bubble b is also rising, so that it is in the state of being most easily scraped, which is a timing suitable for determining the deinking bubble b.

According to the above configuration, the timing of scraping the deinked bubbles b to the bubble receiving portion is constant, and the timing of determining the amount of deinked bubbles b generated can be determined under the same conditions each time.

In the eco mode, for example, a. Or b. The deinking bubble b may be determined at such a timing. The eco mode is a mode in which the number of playbacks is increased instead of lowering the quality of the product (deinking quality).
a. The scraping member is rotated every time the upper limit detection sensor detects the upper limit water level, and the amount of deinked bubbles b generated on the receiving portion is detected.
b. After the upper limit detection sensor detects the upper limit water level (when the supply from the pulper to the deinking tank is stopped)
Every time the amount of water stored in the deinking tank decreases from the upper limit water level to an arbitrary amount (for example, 2.0 L) exceeding the normal mode (1.5 L), the scraping member is rotated and received on the receiving unit. The amount of deinking bubble b generated is detected.

(2) Next, the amount of deinked bubbles b generated on the receiving unit 552 is detected by the optical sensors 25 and 26 and determined (S3).

The bubble determination subroutine (S3) is based on a data table that defines the correlation between the detection result of the deinked bubble b shown in FIG. 7 and the control (air pump and surfactant input) corresponding to the result. Be controlled. The detection result of the deinking bubble b is a combination of states in which the deinking bubble b is detected at the light irradiation positions A and B corresponding to the optical sensors 25 and 26 (the light irradiation is blocked by the deinking bubble b). It is a determination result of the generation state of the deinking bubble b corresponding to the result (combination).
The "○" mark in the data table indicates that the deinking bubble b is detected (the light irradiation is blocked by the deinking bubble b), and the "x" mark indicates that the deinking bubble b is not detected (deinking). It is a state in which the reflected light can be received without blocking the irradiation of light by the bubbles b).

In the deinking bubble detection unit 603, the light emitted from the optical sensors 25 and 26 (photoelectric sensors) is dispersed (absorbed) by the deinking bubbles b on the receiving unit, and the reflected light is received by the optical sensors 25 and 26. If this is not done, the presence or absence of the deinking bubble b at the predetermined detection position can be stably detected by determining that the deinking bubble b has been detected at the predetermined detection position (in the data table). "○" mark). Further, by using the determination result, it is possible to determine the amount of deinking bubbles b generated in the deinking portion 11 in a pseudo manner, and it is difficult to directly measure the amount of bubbles in the deinking portion 11. The amount of generation can be detected and determined with a simple configuration.

As shown in FIG. 8, when the combination of the light irradiation positions A and B corresponding to the optical sensors 25 and 26 is [point A; x, point B; x], bubbles are shown as shown in FIG. Is determined to be "small", and the supply amount of the air pump is increased (the applied duty is increased). The surfactant is added to the deinking tank 501 only when the amount of deinking bubbles b generated does not become an appropriate amount even if the amount of air supplied by the air supply device is increased to the maximum value.

As shown in FIG. 9, when the combination of the light irradiation positions A and B is [point A; 〇, point B; ×], as shown in FIG. 7, the bubble generation state is “appropriate amount”. Judging that, the supply amount of the air pump will be kept as it is.

As shown in FIG. 10, when the combination of the light irradiation positions A and B is [point A; 〇, point B; 〇], as shown in FIG. 7, the bubble generation state is “many”. Is determined, and the supply amount of the air pump is reduced (applied Duty is DOWN).

As shown in FIG. 11, when the combination of the light irradiation positions A and B is [point A; ×, point B; 〇], it is determined as “sensor abnormality” as shown in FIG. Performs predetermined error processing. Normally, it is impossible to jump over point A and detect only point B.

(3) When the above-mentioned foam determination is completed, the scraping member 556 and the deinked foam b on the receiving unit 552 are provided by the plurality of shower nozzles 609 in the cleaning liquid supply unit 608 installed above the receiving unit 552 shown in FIG. To prepare for the next bubble determination (S4). When cleaning with the shower nozzle 609, the deinking foam b on the receiving portion 552 may be directly cleaned with a wiper or the like.

According to the above configuration, the amount of air supplied to the deinking portion can be appropriately controlled according to the amount of deinking bubbles b generated determined by a simple means, and the deinking process can be appropriately performed. Further, if the amount of the surfactant added to the deinking portion is appropriately controlled according to the determined amount of deinking bubbles b generated, the deinking treatment can be appropriately performed. Further, the surfactant is added to the deinking tank only when the amount of deinking bubbles b generated does not become an appropriate amount even if the air supply amount of the air supply device is increased to the maximum value. You may. By doing so, there is no waste of surfactant.

Further, if a plurality of optical sensors 25 and 26 are provided and the distribution of the deinking bubbles b on the receiving portion is determined by the combination of the presence or absence of detection of the deinking bubbles b by the optical sensors 25 and 26, the distribution of the deinking bubbles b can be easily determined. It is possible to determine the generation status of the deinking bubble b in the deinking tank.

The receiving unit 552 is inclined downward toward the deinking bubble discharging unit 550, and after determining the amount of deinking foam b generated, the received deinking bubble b is used as the deinking bubble b discharging opening. It can be easily transferred. Further, by providing a cleaning liquid supply unit 608 for flushing the received deinking foam b to the deinking foam discharging unit 550 above the receiving unit 552, after determining the amount of deinking foam b generated, the received deinking foam b is deinked. The foam b can be easily washed away to the deinking foam discharging portion 550.

In the cleaning operation using the shower nozzle 609 of the cleaning liquid supply unit 608, a cleaning liquid that can remove the deinking foam b from the receiving unit may be used. As a result, it is possible to save white water or clean water used for the cleaning liquid while appropriately determining the amount of deinking foam b.
Further, when an error such as a jam occurs and the operation is interrupted, or at least when the operation is terminated after the operation is continued for a predetermined time such as one day or a certain period of time, the cleaning liquid supply unit 608 prepares the cleaning liquid. An adjusting means for adjusting the supply amount to be larger than that during normal operation may be provided. As a result, more dirt can be removed from the receiving portion when the operation is interrupted or terminated, malfunction due to accumulation of dirt can be suppressed, and proper determination can be made when the operation is restarted.
In order to increase the amount of cleaning liquid, the amount of cleaning liquid discharged from the shower nozzle 609 may be increased per unit time, and the discharge time may be the same as or longer than that during normal operation, and the amount of liquid discharged per unit time may be increased. Is the same as during normal operation, and the discharge time can be lengthened.

Since the used paper recycling apparatus of the present invention includes the above-mentioned deinking device, it is possible to detect the operating state of the deinking process in the deinking portion with a simple configuration and efficiently control it.

(Second embodiment of the deinking section)
A second embodiment of the present invention will be described with reference to FIG. In the description, a configuration different from the above-described first embodiment will be mainly described.

In the first embodiment, the deinking tank 501 is configured such that the tank body forms a double cylindrical body, and deinking bubbles are formed in the "inside" of the inner wall 542 of the double cylindrical body. A deinking bubble discharging unit 550 for discharging b to the outside of the deinking tank was provided. Further, the deinking bubbles b generated in the deinking tank 501 are configured to be attracted to the foam receiving portion 551 in the deinking tank 501 by the "rotational drive" of the scraping member 556.

In the second embodiment, as shown in FIG. 13, the deinking tank 501 has a pair of inclined portions 36a and 36b inclined so that the width of the upper portion is gradually reduced. A quadrangular (example of a polygon) opening 37 having four (an example of a plurality of) sides is formed at the upper end of the deinking tank 501 and above the inclined portions 36a and 36b. .. On one side of one end of the opening 37 in one direction, a deinking bubble discharging portion 550 is formed so that the deinking foam b overflows from the inside of the deinking tank 501 to the “outside the tank”.

A scraping member 556 is provided above the deinking tank 501, and the scraping member 556 deinks from the opening 37 of the deinking tank 501 by a moving device 82 that "slides" the scraping member 556. The deinking foam b that overflows to the outside of the tank 23 is configured to be pushed out from the foam receiving portion 551 to the deinking foam discharging portion 550.

The moving device 82 reciprocates the movable body 86 to which the scraping member 556 is integrally attached in the one-way C and the return direction D along the shaft 94.

The foam receiving unit 551 has a receiving unit 552 that receives the deinked bubbles b that has been attracted by the scraping member 556, and a deinking bubble detecting unit 603 that detects the amount of deinked bubbles b generated on the receiving unit 552. And, it has a deinking bubble discharging part 550 that receives the deinking bubble b on the receiving part and discharges it to the outside of the deinking tank through the discharge path.

The deinking bubble detection unit 603 is installed facing above the receiving unit 552, and the optical sensors 25 and 26 that irradiate light and receive incident light, and the receiving unit 552 are the optical sensor 25. , 26 is configured to be able to reflect the light emitted from the receiving portion 552 on the surface of the receiving portion 552, and the amount of deinking bubbles b generated is determined by detecting the light reflected on the surface of the receiving portion 552 with an optical sensor. A determination means (not shown) for determining is provided.

Further, a shower nozzle 609 that can rotate in the vertical direction is provided above the receiving portion 552, and when the same bubble determination as in the first embodiment is completed, the shower nozzle 609 causes the scraping member 556 and , The deinked foam b on the receiving unit 552 is washed away to prepare for the next foam determination.

(Third embodiment of the deinking part)
A third embodiment of the present invention will be described with reference to FIGS. 14 and 15. In the description, a configuration different from the above-described second embodiment will be mainly described.
The difference between the second embodiment and the third embodiment described above is that in the deinking bubble detection unit 603, the optical sensors 25 and 26 and the reflective member (receiver) that reflects the light emitted from the optical sensors 25 and 26. The arrangement with the part 552) is different.

In the third embodiment, as shown in FIG. 14, the optical sensors 25 and 26 are arranged in front of the paper surface of FIG. 14, and are reflected to the back side of the paper surface of FIG. 14 without using the receiving portion 552. The plate 28 is arranged so that the light irradiation positions of the optical sensors 25 and 26 are at points A and B.

Then, in the example shown in FIG. 15, the deinking bubble b scraped by the scraping member 556 is detected as [point A; 〇, point B; ×]. In FIG. 15, for convenience of explanation, the optical sensors 25 and 26 arranged in front of the paper surface of FIG. 15 are omitted.

In the third embodiment shown in FIGS. 14 and 15, if the light irradiation positions A and B are separated from the receiving portion 552, the optical sensors 25 and 26 are calculated by the height of the bubbles. It is possible to adjust the detection sensitivity of.

Although the embodiments of the present invention have been described in detail above, the specific configuration is not limited to the embodiments of the present invention, and the present invention may be changed in design without departing from the gist of the present invention. include.
The shape of the tank body of the deinking portion 11 is not limited to a cylinder, and it is also possible to form a tubular body having a polygonal shape in a plan view. For example, the outer wall 541 may be a cylindrical body such as a quadrangle or a hexagon in a plan view, and the inner wall 542 may be a cylindrical body such as a quadrangle or a hexagon, and a combination thereof is also possible.

23 Rotation drive shaft 25 Optical sensor 26 Optical sensor 501 Deinking tank 502 Pulp solution inflow part 505 Pulp solution discharging part 506 Tank outlet 541 Outer wall 542 Inner wall 551 Foam receiving part 552 Receiving part 556 Scraping member 603 Deinking bubble detecting part 605 Upper limit Detection sensor

Claims (14)

In a deinking device equipped with a deinking tank that deinks a pulp solution made by dissociating used paper and a deinking foam collecting and discharging unit that collects and discharges deinking bubbles of deinking drainage generated in the deinking tank.
The deinking tank is provided with a bubble release device that discharges bubbles into the pulp solution in the deink tank, and further includes an air supply device that supplies air to the bubble release device. Is a bubble receiving part that drops the deinking bubbles, a scraping member that moves in the deinking tank and attracts the deinking bubbles floating on the liquid surface in the deinking tank to the deinking part, and a scraping member. The foam receiving unit has a scraping member driving unit that drives the suction member, and detects a receiving unit that receives the deinked bubbles that are scraped by the scraping member and the amount of deinked bubbles generated on the receiving unit. It has a deinking foam detection unit and a deinking foam discharging unit that receives the deinking foam on the receiving unit and discharges it to the outside of the deinking tank via a discharge path.
The deinking bubble detection unit is installed facing above the receiving unit, irradiates light, and receives incident light, and the receiving unit receives light emitted from the optical sensor. It is characterized in that it is configured to be reflective on the surface of the portion, and is provided with a determination means for determining the amount of deinked bubbles generated by detecting the light reflected on the surface of the receiving portion with an optical sensor. Deinking device to do. The deinking foam collecting / discharging unit has a foam receiving unit that opens in the deinking tank and drops the deinking foam, and the scraping member collects deinking foam floating on the liquid surface in the deinking tank. The deinking device according to claim 1, wherein the scraping member driving unit is configured to scrape to the foam receiving portion by rotating, and the scraping member driving portion drives the scraping member to rotate. The claim is characterized in that the deinking tank has a double cylindrical body, and the deinking foam discharge path is integrally provided inside the inner wall of the double cylindrical body. 2. The deinking device according to 2. The deinking according to any one of claims 1 to 3, further comprising a control unit that controls the air supply amount of the air supply device according to the determined amount of deinking bubbles generated. Device. Further equipped with a surfactant charging means for charging the surfactant into the deinking tank,
The deinking apparatus according to claim 1 or 4, further comprising a control unit that controls the amount of surfactant charged into the deinking tank according to the determined amount of deinking bubbles generated. .. When the amount of deinking bubbles determined is small,
The claim is characterized in that the surfactant is charged into the deinking tank only when the amount of deinking bubbles generated does not become an appropriate amount even if the air supply amount of the air supply device is increased to the maximum value. The deinking device according to 5. In the deinking bubble detection unit, a plurality of optical sensors are arranged so that the light irradiation positions with respect to the receiving unit are different, and the deinking bubble can be detected by combining the presence or absence of deinking bubble detection by the plurality of optical sensors. The deinking apparatus according to any one of claims 1 to 6, wherein the amount of generation is determined. It is equipped with a liquid level detection unit that detects the reference liquid level of the pulp solution in the deinking tank, and when the reference liquid level is detected, it drives a scraping member to remove floating on the liquid surface in the deinking tank. The invention according to any one of claims 1 to 7, wherein the amount of deinked bubbles generated is determined by the determination means in the deinked bubble detecting unit after the sumi bubbles are attracted to the bubbling receiving portion. Deinking device. The deinking device according to any one of claims 1 to 8, wherein the receiving portion is inclined downward toward the deinking bubble discharge opening. The deinking according to any one of claims 1 to 9, wherein a cleaning liquid supply unit for flushing the received deinking foam to the deinking foam discharge opening is provided above the receiving portion. Device. The deinking device according to claim 10, further comprising an adjusting means for adjusting the amount of cleaning liquid supplied by the cleaning liquid supply unit to be larger than that during normal operation when the operation is interrupted or at least at the end of operation. The deinking device according to any one of claims 1 to 11, wherein the optical sensor is a laser type photoelectric sensor. The deinking device according to claim 12, wherein the laser spot light is set so as to have a diameter of 5 mm or less on the surface of the receiving portion. A recycled paper recycling apparatus comprising the deinking apparatus according to any one of claims 1 to 13.

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