JP2017115259A - Waste paper recycling processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste paper recycling processing apparatus which does not affect quality of recycled paper even when paper pieces attached on an inner wall surface of a stirring tank are mixed in a pulp solution and downsizing of the apparatus is realized.SOLUTION: The waste paper recycling processing apparatus comprises a pulper part that is a processing part constituting a waste paper recycling processing system and a control part that controls the operation of the processing part. The pulper part has a stirring tank 901, a stirrer that rotatably drives a stirring blade 902 in the stirring tank 901, and a water supply part 911 that supplies water for dilution to the stirring tank 901. The control part drives the stirrer sequentially in a disintegration operation mode, a transition operation mode, and a dilution operation mode.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a used paper recycling apparatus that is installed in an office or the like where waste paper is generated to recycle the paper.

  Conventionally, used paper recycling processing apparatuses are provided with a used paper input unit, a pulper unit, a deinking unit, a paper making unit, a drying unit, and a control unit for controlling operation. The waste paper input section supplies recycled paper as recycled raw material to the pulper section, the pulper section disaggregates waste paper and adjusts the waste paper pulp solution containing waste paper pulp, and the deinking section A deinked pulp is prepared by deinking the solution. The paper making section is for making wet paper from the deinked waste paper pulp solution, and the drying section is for drying the dehydrated wet paper.

  The pulper unit has a stirrer tank, a stirring blade disposed in the stirrer tank, and a drive unit that rotationally drives the stirrer blade. The prepared waste paper pulp solution is transferred to the next step.

  As shown in FIG. 5, in the pulper unit, a predetermined amount of agitation water is poured (S1), then used paper is added (S2), and then the agitation blade is rotated at 750 rpm to disaggregate (S3). Then, it stirs, supplying dilution water (S4), and stops at (S5) when the pulp concentration reaches 4% by weight (S6).

  In addition, in Patent Document 1, when stirring is performed with a stirring blade, the water level of the liquid containing water from the waste paper raw material and the water supply unit in the stirring tank is stirred at a height at which the stirring blade can be immersed, and stirring processing is performed. A technique is described in which, when the rotation speed of the stirring blade increases, water is supplied from the water supply section so that the stirring blade is immersed in the liquid in the stirring tank.

JP2011-219893

  In the above-mentioned pulper section, the agitation blade in the agitation tank is rotated at a disaggregation speed (750 rpm) to disaggregate waste paper in a predetermined amount of disaggregation water to prepare a waste paper pulp solution having a disaggregation concentration (8 wt%). After that, the waste paper pulp solution is diluted to a predetermined concentration (4% by weight) by adding dilution water while rotating at a rotational speed for stirring (400 rpm). By suppressing the number of revolutions, the stirring force becomes excessive, resulting in wasted power costs and noise.

  However, in the middle of the disaggregation operation, undisaggregated paper pieces may adhere to the inner wall surface of the stirring tank of the pulper unit, and the adhering undisaggregated paper pieces may be mixed in the waste paper pulp solution during the dilution operation. There is a problem that causes the paper to be degraded with the waste paper pulp solution and causes the quality of the recycled paper to deteriorate, or the mixed paper piece adheres to the liquid level sensor, causing a detection malfunction when detecting the liquid level in the stirring tank. there were.

  Also, conventionally, after discharging the waste paper pulp solution of a predetermined concentration to the deinking part of the next process, water is sprayed into the tank from a plurality of shower heads provided facing the opening of the stirring tank, and adheres to the inner wall surface of the stirring tank The fibers of the used paper pulp and undissolved paper pieces are washed away to wash the inside of the agitation tank, and the adhesion of the paper pieces causing the above-mentioned problems is eliminated before the next disaggregation treatment. However, the shower head becomes a factor of increasing the complexity and size of the apparatus, and increases the cost.

  The present invention solves the above-mentioned problems, and even if a piece of paper adhering to the inner wall surface of the stirring tank is mixed in the waste paper pulp solution during the dilution process operation, it does not affect the quality of the recycled paper. It is an object of the present invention to provide a used paper recycling apparatus that eliminates the need for cleaning with water spray and realizes downsizing of the apparatus.

  In order to solve the above-described problems, a used paper recycling processing apparatus according to the present invention includes a pulper unit that is a processing unit constituting a used paper recycling processing system, and a used paper recycling processing apparatus that includes a control unit that controls operation of the processing unit. The unit has a stirring tank, a stirring device that rotationally drives the stirring blades in the stirring tank, and a water supply unit that supplies dilution water to the stirring tank, and the control unit sequentially turns the stirring device into disaggregation operation mode and transition operation. In the disaggregation operation mode, the waste paper is disaggregated in a predetermined amount of disaggregation water stored in the agitation tank by rotating the agitation blade at the disaggregation speed to generate a waste paper pulp solution. In the transition operation mode, while the dilution water is supplied from the water supply unit to the waste paper pulp solution in the stirring tank, the agitation blade is rotated at the rotational speed for disaggregation to stir the waste paper pulp solution. In the dilution operation mode, from the water supply unit In the stirring tank While water and water for dilution in the paper pulp solution, by rotating the stirring blades at a stirring rotation speed slower than the macerating rotation speed for stirring the used paper pulp solution.

  In the used paper recycling treatment apparatus of the present invention, the waste paper recycling processing apparatus includes a concentration detection unit that detects the concentration of the used paper pulp solution in the stirring tank, and the control unit switches the operation mode using the concentration of the used paper pulp solution as an index, and the transition end in the transition processing operation. Switching from the transition operation mode to the dilution operation mode by concentration, the transition end concentration is set lower than the end disaggregation concentration in the disaggregation operation mode, and set higher than the end dilution concentration in the dilution processing operation in the dilution operation mode. To do.

  In the used paper recycling apparatus of the present invention, the processing unit includes a used paper input unit that inputs used paper into the agitation tank, the used paper input unit has a weight sensor that measures the amount of used paper input to the agitation tank, and the water supply unit is agitated It has a flow sensor for measuring the amount of water supplied to the tank, and the concentration detector calculates the concentration of the used paper pulp solution from the measured value of the weight sensor and the measured value of the flow sensor.

  In the used paper recycling apparatus of the present invention, the processing unit includes a used paper input unit that inputs used paper into the stirring tank, the used paper input unit inputs the used paper into the stirring tank a plurality of times, and the control unit inputs the used paper of the used paper input unit. During operation, the stirrer is operated in the disaggregation preparation operation mode, and in the disaggregation preparation operation mode, the used paper is roughly torn by rotating the stirring blade at a rotation speed for rough crack diffusion lower than the rotation speed for stirring. To do.

  As described above, according to the present invention, the stirring device is driven in the transition operation mode between the disaggregation operation mode and the dilution operation mode, and in the transition operation mode, the stirring blade is supplied while supplying the dilution water to the waste paper pulp solution. By rotating at the speed of disaggregation, waste paper adhering to the inner wall surface of the stirring tank in the disaggregation operation mode is taken into the waste paper pulp solution as the liquid level in the tank rises, and disaggregation is performed at the speed of disaggregation. To do. For this reason, it can suppress that the paper piece with a rough used paper remains in a used paper pulp solution in dilution operation mode, and can prevent the quality fall resulting from a paper piece in papermaking of a post process. In addition, since the inner wall surface of the tank is effectively washed with the used paper pulp solution and the paper pieces are washed by strongly agitating the used paper pulp solution while the liquid level in the tank is rising, washing by watering from the shower head Can be reduced, and the size of the apparatus can be reduced.

The flowchart which shows the processing flow of the used paper reproduction | regeneration processing apparatus in embodiment of this invention Block diagram showing the used paper recycling system Sectional view showing the pulper unit of the used paper recycling processor Schematic diagram showing the structure of the papermaking section Flowchart in conventional processing method

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, the used paper recycling processing apparatus has a plurality of processing units constituting a used paper recycling processing system, and the processing units include a used paper feeding unit 1, a pulper unit 9, a deinking unit 11, and a paper making unit. 13, a drying unit 14, a finishing unit 15, a white water tank unit 100, and a deinking waste liquid treatment apparatus 101. In addition, the used paper recycling apparatus includes a control unit 700 that controls the operation of each processing unit.

  In the present embodiment, the used paper input unit 1 inputs used recycled paper sheets into the pulper unit 9, and the pulper unit 9 disintegrates the used paper in the disaggregation water to contain used paper pulp. Prepare pulp solution. Details of the used paper input unit 1 and the pulper unit 9 will be described later.

  The deinking unit 11 deinks the waste paper pulp solution in the deinking tank 501, separates and removes the deinking waste liquid containing solids such as fibers and ink in the waste paper pulp solution, and removes the deinked waste paper pulp solution. While being sent to the paper making unit 13, the deinking waste liquid is taken out from the outlet and supplied to the deinking waste liquid processing apparatus 101 through the deinking drainage system 102.

  As shown in FIG. 4, the paper making unit 13 is for making the wet paper 12 from the deinked waste paper pulp solution, and a paper making wire 42 made of a mesh-like belt wound around a plurality of rollers 41; A head box 43 for pouring the deinked waste paper pulp solution onto the paper making wire 42 is provided.

  The endless track of the paper making wire 42 includes an outward path portion from the head box 43 to a later-described drying roller 49, a transition portion that covers a part of the drying roller 49, and a return path portion that returns from the drying roller 49 to the head box 43. .

  In the forward path portion of the papermaking wire 42, a draining portion 44 that slides on the lower surface of the papermaking wire 42 and drops water dripping from the lower surface of the papermaking wire 42 near the head box 43 on the lower side of the papermaking wire 42, and the papermaking wire 42 A suction device 45 for sucking moisture from the wet paper 12 is provided.

  Further, on the downstream side of the suction device 45, a plurality of squeezing rollers 41a and 41b are located with the paper making wire 42 interposed therebetween, and the wet paper 12 on the paper making wire 42 passing between both rollers by the squeezing rollers 41a and 41b. Squeeze. When the moisture content of the wet paper 12 immediately after being supplied from the head box 43 to the papermaking wire 42 is 100% by weight, the wet paper 12 having passed through the squeezing rollers 41a and 41b has a moisture content of 60 to 65% by weight.

  The drying unit 14 includes a drying roller 49 that dries the dehydrated wet paper 12. The drying roller 49 has a built-in heating device. A part of the drying roller 49 is covered with a canvas belt 51 wound around a plurality of rollers 50 and covers the drying roller 49 with a part of the endless track, and the drying unit 14 is provided between the canvas belt 51 and the outer peripheral surface of the drying roller 49. The wet paper 12 is sandwiched between the two, and the wet paper 12 is dried by the drying roller 49. A calender roller 50 a that presses the wet paper 12 against the drying roller 49 is provided between the transition portion of the paper making wire 42 and the canvas belt 51.

The dry paper 61 dried by the scraper 111 at the forward end position of the canvas belt 51 is peeled off from the drying roller 49 and guided to the finishing unit 15.
The finishing unit 15 performs a finishing process on the dry paper 61 obtained by drying the wet paper 12, and discharges the obtained recycled paper 62 to the paper receiving unit 63. The dry paper 61 is a predetermined size. A metal cutter device 60 and a slitter device 112 are provided.

  The white water tank unit 100 stores white water, which is waste water containing waste paper pulp flowing from the paper making unit 13 through the paper making drainage system 104, and returns the white water to various parts of the used paper recycling processing system through the white water return systems 105 and 106. . The white water return system 106 communicating with the pulper unit 9 supplies white water as the disaggregation water and dilution water to the stirring tank 901 of the pulper unit 9.

  A water supply source 108, here, a water supply pipe 108 for supplying water from a water supply pipe 107 is connected to the white water tank section 100, and a main valve device 109 for emergency stop including an electromagnetic valve is provided in the water supply pipe 108.

  The deinking waste liquid processing apparatus 101 processes the deinking waste liquid supplied from the deinking unit 11 through the deinking drainage system 102, and separates solid components and liquid phase components such as fibers, ink, and toner of waste paper pulp. .

  As shown in FIG. 3, the used paper input unit 1 is located above the stirring tank 901 of the pulper unit 9, and inputs the recycled paper used as a raw material directly into the pulper unit 9 as a sheet. The used paper feeding unit 1 has a posture holding unit 203 that holds a sheet in an upright posture, and the posture holding unit 203 is formed of a rectangular frame body having an upper opening and a lower opening and having an upper opening and a lower opening. The lower opening faces the upper opening of the stirring tank 901. A slide bottom plate 206 forming the bottom of the posture holding unit 203 covers a lower opening of the posture holding unit 203, and the slide bottom plate 206 is movable in a sliding direction for opening and closing the lower opening.

  The used paper input unit 1 includes a weight sensor (not shown) including a load cell that measures the weight of used paper loaded on the posture holding unit 203. The posture holding unit 203 is provided with a posture holding auxiliary plate 203a. The holding auxiliary plate 203a divides the sheet stacking space of the posture holding unit 203 into a plurality of compartments.

In order to ensure safety for the user, a cover part 301 is provided to cover the upper opening of the posture holding part 203, and the cover part 301 includes a transparent door body 302.
The pulper unit 9 includes a stirring blade 902 and a rotating shaft 903 that rotationally drives the stirring blade 902 as a stirring device inside the stirring tank 901. The rotary shaft 903 is pivotally attached to the bottom of the tank, is rotatably supported by two upper and lower bearings 904 and 905 disposed above the stirring tank 901, and has a pulley 906 between the upper and lower bearings 904 and 905. The pulley 906 is driven by the stirring blade drive motor 922 via the belt 907, whereby the rotating shaft 903 and the stirring blade 902 rotate. The stirring blade drive motor 922 has a torque sensor 923.

  The stirring tank 901 has an extraction port 908 at the bottom of the tank, and a transfer unit 909 is connected to the extraction port 908. The transfer unit 909 forms a transfer path for transferring the waste paper pulp solution disaggregated in the stirring tank 901 to the deinking unit 11 and includes a tube pump 910 as a transfer pump.

  A water supply unit 911 provided facing the opening of the agitation tank 901 supplies dilution water to the agitation tank 901, and white water is supplied to the water supply part 911 via a flow rate sensor 921 comprising a vortex flow meter or an impeller flow meter. A return system 106 is connected. Further, a white water return system 105 is connected to the transfer unit 909 as a second water supply unit at a downstream position of the tube pump 910.

  Inside the stirring tank 901, as a liquid level sensor for detecting the liquid level of the used paper pulp solution, an upper limit liquid level detection sensor 912 corresponding to the upper limit liquid level that can be stored in the tank, and the positions of the stirring blades 902 in the tank And a lower limit liquid level detection sensor 914 corresponding to a predetermined remaining liquid level when a predetermined amount of used paper pulp solution is stored.

  The control unit 700 has a concentration detection unit 701, and the concentration detection unit 701 calculates the concentration of the used paper pulp solution based on the weight measurement value of the weight sensor 207 and the flow rate measurement value of the flow rate sensor 921.

  The operation of the above configuration will be described below. The control unit 700 controls the used paper input unit 1, the pulper unit 9, the deinking unit 11, the paper making unit 13, the finishing unit 15, the white water tank unit 100, and the deinking waste liquid processing apparatus 101. Run the system.

  The slide bottom plate 206 of the used paper input unit 1 is disposed at the fully closed position, and in this state, the door body 302 of the cover unit 301 is opened, and a bundle of sheets is mounted in the frame body of the posture holding unit 203. The slide bottom plate 206 is moved in the opening direction of the sliding direction, and the lower opening of the posture holding unit 203 is opened. The sheets are sequentially dropped from the lower opening to the agitation tank 901 of the pulper unit 9 in a standing position as the slide bottom plate 206 is opened for each chamber divided by the posture holding auxiliary plate 203a. The stirring tank 901 stores a predetermined amount of white water supplied from the water supply unit 911 as disaggregation water.

Next, the control unit 700 sequentially operates the stirring device of the pulper unit 9 in the disaggregation operation mode, the transition operation mode, and the dilution operation mode.
In the present embodiment, the used paper input unit 1 inputs the used paper into the stirring tank 901 a plurality of times, but it is also possible to input the used paper once.

  The control unit 700 operates the stirring blade 902 in the disaggregation preparation operation mode during the used paper input operation of the used paper input unit 1. In the disaggregation preparation operation mode, a rough tearing process is performed in which the stirrer blade 902 is rotated at a rotational speed for rough crack diffusion of 200 rpm, which is lower than the rotational speed for stirring of 750 rpm, and the used paper is roughly torn.

  That is, as shown in FIG. 1, in the pulper unit 9, a predetermined amount of agitation water is poured (S11), then used paper is added (S12), followed by a rough tearing process (S13), and used paper is again input. (S14), followed by rough cracking (S15).

  For this reason, even when the waste paper previously fed into the stirring tank 901 and the waste paper later thrown into the stirring tank 901 are mixed in the tank of the stirring tank 901, the waste paper introduced earlier loosens the overlap. In addition, the paper was roughly torn and did not prevent the waste paper to be introduced later from being immersed in the water for disaggregation, and the waste paper was roughly torn prior to the disaggregation process regardless of the time of introduction. It will be in a state and a disaggregation process can be performed smoothly.

  Next, in the disaggregation operation mode (S16), the waste paper is disaggregated in a predetermined amount of disaggregation water stored in the agitation tank 901 by rotating the agitation blade 902 at a disaggregation rotation speed of 750 rpm, and the disaggregation processing operation is performed. This produces a waste paper pulp solution with a final disaggregation concentration of 8% by weight at the end of. The end of the disaggregation processing operation is detected by the load measured by the torque sensor 923, and when the disaggregation is completed when the torque decreases with the progress of the disaggregation processing and the measured value of the torque sensor 923 reaches a predetermined value. To do. The end of the disaggregation treatment operation can also be detected by a temperature of 15 ° C. to 20 ° C. of the waste paper pulp solution that rises with the progress of the disaggregation treatment. The end of the disaggregation processing operation can also be detected by timer control.

  In the transition operation mode (S17), while the dilution water is supplied from the water supply unit 911 to the waste paper pulp solution in the stirring tank 901, the stirring blade 902 is rotated at a disaggregation speed of 750 rpm, and the waste paper pulp solution is stirred to 8 weight. Dilute to a final concentration of 6% by weight at the end of the disaggregation operation.

  At this time, the controller 700 calculates the amount of diluted water that is insufficient to make the waste paper pulp solution 6% by weight transition end concentration from the amount of used paper that has been input, that is, the amount of used paper measured by the weight sensor 207, The calculated amount is supplied from the water supply unit 911, and the used paper pulp solution is adjusted to the transition end concentration. The end of the transition processing operation is detected by timer control (S18).

  The end of the transition processing operation can also be detected by a change in the concentration of the used paper pulp solution. That is, the concentration detection unit 701 of the control unit 700 calculates the concentration of the used paper pulp solution from the weight measurement value of the weight sensor 207 and the flow rate measurement value of the flow rate sensor 921. The controller 700 switches from the transition operation mode to the dilution operation mode at the transition end concentration of the waste paper pulp solution, assuming that the waste paper pulp solution has reached 6% by weight of the transition end concentration at the time when the water supply from the water supply unit 911 is completed. . The end of the transition processing operation can also be detected by the measured value of the torque sensor 923.

  Thus, in the transition operation mode performed between the disaggregation operation mode and the dilution operation mode, the disintegration operation mode is performed by rotating the stirring blade 902 at the disaggregation rotation speed while supplying dilution water to the waste paper pulp solution. A piece of waste paper attached to the inner wall surface of the stirring tank 901 is sometimes taken into the waste paper pulp solution as the liquid level in the tank rises, is disaggregated at a disaggregation speed, and can be supplied to at least the deinking unit 11 Can be disaggregated to a simple shape.

  For this reason, it is possible to suppress the remaining waste paper pieces from remaining in the waste paper pulp solution in the dilution operation mode, and it is possible to prevent the quality from being deteriorated due to the paper pieces in the paper making of the paper making unit 13 in the subsequent process. In addition, by strongly agitating the used paper pulp solution during the rise of the liquid level in the tank, the inner wall surface of the tank is effectively washed with the used paper pulp solution and the paper pieces are washed. This eliminates the need for cleaning with water spraying, and can reduce the size of the apparatus.

  In the dilution operation mode (S19), while supplying dilution water to the waste paper pulp solution in the stirring tank 901 from the water supply unit 911, the stirring blade 902 is rotated at a rotation speed of 400 rpm, which is lower than the rotation speed of 750 rpm. The waste paper pulp solution is stirred and diluted from a 6% by weight transition end concentration to a 4% by weight end dilution concentration at the end of the dilution process operation. This final concentration of dilution is for supplying the waste paper pulp solution to the deinking unit 11 with the tube pump 910, and the final concentration of dilution is set according to the specifications of the tube pump 910. When the concentration of the used paper pulp solution reaches 4% by weight (S20), the process ends (S21).

  Next, while stirring the used paper pulp solution by rotating the stirring blade 902, the tube pump 910 of the transfer unit 909 is driven to take out the used paper pulp solution from the takeout port 908 of the stirring tank 901 and transfer it to the deinking unit 11. .

DESCRIPTION OF SYMBOLS 1 Used paper input part 9 Pulper part 11 Deinking part 12 Wet paper 13 Paper making part 14 Drying part 15 Finishing part 41 Roller 41a, 41b Drawing roller 42 Paper making wire 43 Head box 44 Draining part 45 Suction device 49 Drying roller 50 Roller 50a Calendar roller 51 canvas belt 60 cutter device 61 dry paper 62 recycled paper 63 paper receiving unit 100 white water tank unit 101 deinking waste liquid treatment device 102 deinking drainage system 104 papermaking drainage system 105, 106 white water return system 107 water supply pipe 108 water supply pipe 109 yuan Valve device 111 Scraper 112 Slitter device 203 Posture holding unit 203a Posture holding auxiliary plate 206 Slide bottom plate 207 Weight sensor 301 Cover unit 302 Door body 501 Deinking tank 700 Control unit 701 Concentration detection unit 901 Stirring blade 902 Stirring blade 903 Rotating shaft 904 905 bearing 906 pulley 907 belt 908 outlet 909 transfer unit 910 tube pump 911 water supply unit 912 upper liquid level detection sensor 913 lower liquid level detection sensor 914 defining the remaining liquid level detection sensor 921 flow sensor 922 stirring blade driving motor 923 torque sensor

Claims (4)

In a used paper recycling processing apparatus comprising a pulper unit, which is a processing unit constituting a used paper recycling processing system, and a control unit that controls the operation of the processing unit,
The pulper unit has a stirring tank, a stirring device that rotationally drives the stirring blade in the stirring tank, and a water supply unit that supplies dilution water to the stirring tank,
The control unit sequentially operates the stirring device in the disaggregation operation mode, the transition operation mode, and the dilution operation mode,
In the disaggregation operation mode, the waste paper is disaggregated in a predetermined amount of the disaggregation water stored in the agitation tank by rotating the stirring blade at the disaggregation rotation speed to generate a waste paper pulp solution.
In the transition operation mode, while supplying the dilution water from the water supply unit to the used paper pulp solution in the stirring tank, the stirring blade is rotated at the rotational speed for disaggregation to stir the used paper pulp solution.
In the dilution operation mode, the waste paper pulp solution is agitated by rotating the stirring blade at a lower rotation speed than the disaggregation rotation speed while supplying dilution water from the water supply section to the waste paper pulp solution in the stirring tank. Used paper recycling processing equipment. Provided with a concentration detector that detects the concentration of waste paper pulp solution in the stirring tank,
The control unit switches the operation mode using the concentration of the waste paper pulp solution as an index, switches from the transition operation mode to the dilution operation mode at the transition end concentration in the transition processing operation,
2. The used paper recycling apparatus according to claim 1, wherein the transition end concentration is set lower than the end disaggregation concentration in the disaggregation operation mode and is set higher than the end dilution concentration in the dilution processing operation in the dilution operation mode. As a processing unit, equipped with a used paper input unit that inputs used paper to the stirring tank,
The used paper input unit has a weight sensor that measures the amount of used paper input into the agitation tank,
A water supply unit has a flow sensor for measuring the amount of water supplied to the stirring tank,
The used paper recycling apparatus according to claim 2, wherein the concentration detection unit calculates the concentration of the used paper pulp solution from the measured value of the weight sensor and the measured value of the flow rate sensor. As a processing unit, equipped with a used paper input unit that inputs used paper to the stirring tank,
The used paper input section inputs used paper into the agitation tank several times.
The control unit operates the stirring device in the disaggregation preparation operation mode during the waste paper feeding operation of the waste paper feeding unit,
4. In the disaggregation preparation operation mode, the used waste paper is roughly torn by rotating the stirring blade at a rotational speed for rough crack diffusion lower than the rotational speed for stirring. Waste paper recycling processor.

Images