JP5253005B2 - Waste paper processing equipment - Google Patents

Description

  The present invention relates to a technique for producing paper from recycled pulp obtained by separating waste paper, and relates to a small waste paper processing apparatus that can be installed in an office or the like where waste paper is generated to recycle the paper.

2. Description of the Related Art Conventionally, in Japan, a technology and a social system for collecting used paper once used, for example, used newspapers and regenerating the used paper are established.
A papermaking method performed in a general papermaking factory includes a pulp process, a papermaking process, and a finishing process. When used paper is used as a raw material, a used paper pulp process is added.

In the pulp process, pulp is produced from wood chips through a process such as cooking, washing, bleaching, and selection by a chemical method, which is one of the pulping methods for extracting fibers from wood.
In the waste paper pulp process, the waste paper that is the raw material is dissolved in water, and metal, film, adhesive resin, printing ink (dye type, pigment type), which is a foreign matter other than paper fiber, using mechanical power and chemicals, The copy toner is separated and removed, and then bleached, dehydrated and dried to obtain waste paper pulp.

  In the paper making process, the product paper is processed through the wire part, press part, dryer part, calendar part, and coater part of the paper machine. In the wire part, the prepared pulp is placed on a papermaking net (wire) and dehydrated to make paper, and in the press part, the moisture in the wet paper containing a large amount of moisture from the wire part is removed. In the dryer part, the paper is dried through a dryer heated with steam, in the calendar part, the paper surface is smoothed between the rolls, and in the coater part, the base paper is coated with paint.

  In the finishing process, in the super calender part, the micro unevenness of the paper surface coated by the coater part is smoothed to give gloss, and in the cutter and winder part, it is cut into a predetermined product size or wound on a roll.

  By the way, when making recycled paper from waste paper, there are the following problems. The consumption place such as the office where waste paper is generated by the consumption of paper and the paper mill that recycles the paper from the waste paper are separated, and cost and energy are required to transport the waste paper. Moreover, there is a risk that confidential information and the like written on the paper will be leaked to the outside by taking out the used paper. For this reason, the paper is finely cut with a shredder, but the shredded dust that has been finely cut is difficult to regenerate because the fibers are too short.

  In Patent Document 1, as a method for producing recycled paper, raw material waste paper is disaggregated, soaked and deinked, and then yeast having cohesive properties is added, and the fine inorganic contained in the ink (dye system, pigment system) by yeast. A configuration is described in which pigments, carbon particles and the like are aggregated, and then the aggregates are separated and removed by flotation.

  Patent Document 2 discloses, as a used paper recycling method and apparatus, a step of separating recycled paper cut by a document cutting machine into a recycled pulp, a step of storing the recycled pulp, and charging the recycled pulp into an injection device. The structure which consists of the process of spraying a fiber sheet and the process of paper-making the recycled pulp sprayed on the fiber sheet is described.

Further, Patent Document 3 includes a pulp manufacturing unit, a paper making unit, and a control unit as a used paper processing device in a cabinet-sized device case, where the pulp manufacturing unit disaggregates and further beats to produce used paper pulp. In the paper making section, a recycled paper pulp is made to produce recycled paper, and the control section drives and controls the pulp manufacturing section and the paper making section in conjunction with each other.
JP-A-8-60570 JP 10-317290 A JP 2007-23450 A

  In the above patent document, it is proposed to reduce the size of the apparatus. However, there is no configuration in which the deinking unit is integrally arranged as a device, and since the recycled pulp is made without deinking, the finished quality of the recycled paper is poor, and the user actively uses the recycled paper. I couldn't. In addition, although it is configured to batch process multiple sheets of used paper, it does not have a function to store a large amount of used paper or cut paper dust in the device. Cannot exceed the capacity of one time. For this reason, when a large amount of used paper is processed, a waiting time occurs in the operation of inputting the used paper, which is inconvenient for the user. Further, the user must always operate to operate the apparatus, and at least the operation of the user is required to start and end the operation, and the apparatus cannot be started and stopped at an arbitrary time. Furthermore, when separating ink (dye-based or pigment-based) or toner from the fiber, the optimum temperature in the disaggregation or deinking process may differ depending on the type of deinking object such as ink or toner.

  The present invention solves the above-described problems, and can reduce the size of the apparatus, promote the use of recycled paper by improving the quality of the recycled paper. In addition, an object of the present invention is to provide a used paper processing apparatus capable of processing at an optimum temperature according to the type of deinking object such as ink or toner.

In order to solve the above-described problems, the used paper processing apparatus of the present invention includes a recycled pulp unit that prepares a recycled pulp by releasing a cut piece of used paper, and a deinked pulp unit that bleaches the recycled pulp to prepare a deinked pulp. And a paper-making unit that makes deinked pulp and prepares recycled paper, and a control unit that controls the operation of each unit,
The deinking pulp section has a plurality of flotation tanks, and has heating means and temperature sensors for adjusting the deinked pulp-containing liquid in each flotation tank to an arbitrary set temperature, for each flotation tank,
The set temperature set for each flotation tank should be adjusted according to the different deinking object for each flotation tank and adjusted to the optimum temperature for each deinking object for each flotation tank. Features.
In the used paper processing apparatus of the present invention, the deinking pulp section has at least two tanks: a flotation tank that uses toner as a deinking object and a flotation tank that uses ink as a deinking object. And
In the used paper processing apparatus of the present invention, the deinking pulp section adjusts the set temperature of the front flotation tank to the optimum temperature for the toner and the set temperature of the subsequent flotation tank to the optimum temperature for the ink. It is characterized by being.

In the waste paper processing apparatus of the present invention, the deinking pulp section has a set temperature of the front flotation tank of 20 ° C. or higher and 80 ° C. or lower corresponding to the toner, and a set temperature of the rear flotation tank corresponds to the ink. The temperature is 60 ° C. or higher and 100 ° C. or lower.

  As described above, according to the present invention, the recycled pulp processing unit, the deinking pulp unit, and the paper making unit are integrally provided to reduce the size, thereby installing the used paper processing apparatus in a consumption place such as an office where the used paper is generated. be able to. For this reason, it is possible to prevent leakage of confidential information by eliminating the need to take a document containing confidential information or the like to the outside, and it becomes unnecessary to perform detailed cutting for the purpose of leakage of confidential information. Therefore, it is possible to cut recycled paper into an arbitrary size suitable for recycling and to make recycled pulp.

  The deinking pulp section has a heating means and temperature sensor that adjusts the deinked pulp containing liquid in the flotation tank to an arbitrary set temperature, so that the deinking pulp section can change the type of deinking object such as ink and toner. An optimum temperature environment can be formed.

  Since the deinking pulp section has a heating means and a temperature sensor for each flotation tank, it corresponds to the type of deinking object for each flotation tank when processing recycled pulp with different types of deinking objects. The optimum temperature environment can be formed, and the optimum temperature environment for the deinking object can be realized in any one of the flotation tanks without promptly confirming the type of the deinking object. be able to. At this time, each deinking object can be reliably treated in the optimum temperature environment by sequentially processing in each temperature environment while moving from the flotation tank in the low temperature environment to the flotation tank in the high temperature environment. Can be processed. For example, the toner is processed in a preceding flotation tank set to 20 ° C. or higher and 80 ° C. or lower, and the ink is processed in a subsequent flotation tank set to 60 ° C. or higher and 100 ° C. or lower.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the used paper processing apparatus integrally includes a recycled pulp unit 1, a deinking pulp unit 2, a paper making unit 3, a finishing unit 4, and a drainage processing unit 5, and prepares recycled paper from used paper 6. A control unit 7 that controls the operation of the recycled pulp unit 1, the deinking pulp unit 2, the paper making unit 3, the finishing unit 4, and the wastewater treatment unit 5 is provided.
(Recycled pulp part)
The recycled pulp unit 1 prepares recycled pulp by separating the cut paper pieces of the waste paper 6, and includes a shredder 11 that cuts the waste paper 6 into a predetermined size suitable for regeneration, and a shredder 11. A shredder tank 12 for temporarily storing the cut piece of cut paper, a fiber concentration adjusting unit 13 and a pulper 14 are provided.

  As shown in FIG. 2, the shredder tank 12 has an upper opening 121 that opens toward the upper shredder 11, and has a bottom surface 122 that is inclined toward the discharge port 123. The discharge port 123 is provided with a discharge device 124 for discharging the cut paper piece 61. There are various discharge devices 124, but here, a plurality of blades are arranged radially around the rotation axis. A paper amount detection sensor 125 is disposed above the discharge device 124. The paper amount detection sensor 125 detects the presence or absence of a piece of cut paper stored in the shredder tank 12, and uses a load cell, an optical sensor, or the like.

  The fiber concentration adjusting unit 13 is disposed below the discharge port 123 of the shredder tank 12, and includes a tray part 131 that receives the cut paper piece 61 discharged from the discharge port 123, and a weighing unit 132 that supports the tray part 131. The weighing unit 132 weighs the weight of the cut paper piece 61 put into the tray part 131, and adjusts the amount of the cut paper piece 61 put into the pulper 14, that is, the fiber amount, by changing the set weight.

  As shown in FIG. 3, the tray part 131 tilts the tray 131 a from a horizontal posture to a tilted posture in which the tray 131 a tilts toward the pulper 14, and has driving means such as a motor for tilting the tray 131 a. The tray 131a is provided so as to be openable and closable between a normal position where the side wall 131b adjacent to the pulper 14 stands and a tilt position where the side wall 131b tilts toward the pulper 14, and the side wall 131b tilts as the tray 131a tilts. Then, it returns to the standing posture with the backward movement of the tray 131a.

  The cutting paper piece 61 is gradually dropped onto the tray 131a by the discharge device 124, and when the measurement value measured by the weighing unit 132 reaches the set value, the discharge device 124 is stopped, and the tray 131a is tilted to cut the cutting paper piece. 61 is put into the pulper 14.

  The pulper 14 disaggregates the cut paper piece 61 into fibers, that is, recycled pulp, in a solvent such as alkaline water, and a tank body 141 into which the cut paper piece 61 is put, and a stirring blade 142 swirling inside the tank body 141. And a driving means (not shown) such as a motor for rotationally driving the stirring blade 142.

  The tank body 141 is provided with a heater 143 and a temperature sensor 144 for heating the solvent to a predetermined temperature. The solvent supply system (not shown) for supplying the solvent and the recycled pulp-containing liquid are transferred to the deinking pulp section 2. A transfer system (not shown) including a conduit, a pump, and the like communicated with each other.

In the pulper 14, an amount of solvent according to the amount of the cut paper piece 61, here water, is charged into the tank body 141, the stirring blade 142 is driven to rotate, the fibers of the cut paper piece are disaggregated to prepare regenerated pulp, and regenerated pulp The recycled pulp containing liquid containing is sent to the deinking pulp section 2.
(Deinking pulp section)
The deinking pulp unit 2 includes a pre-deinking diluting unit 21, a deinking unit 22, and a rinsing unit 23, and a transfer system (not shown) including a conduit, a pump, and the like is provided between the units.

  The pre-deinking diluting unit 21 dilutes the recycled pulp-containing liquid to a fiber concentration suitable for deinking, here about 1% by weight. A supply system (not shown) is provided.

  The deinking unit 22 is called a flowator, and separates foreign matters such as ink and toner from the fibers. In the present embodiment, the deinking unit 22 has the configuration shown in FIG. The deinking unit 22 includes a flotation tank including a front tank 221 and a rear tank 222. The front tank 221 and the rear tank 222 communicate with each other at an opening on the upper end side of a partition wall 223 that forms an overflow weir. Yes. The front tank 221 and the rear tank 222 are respectively provided with heaters 224 and 225 as heating means, the front tank 221 is provided with a fine bubble outlet 226 and a stirring blade 227, and the rear tank 222 is provided with a temperature sensor 228. Is arranged.

  In the front tank 221, in the presence of a surfactant, a regenerated pulp-containing liquid containing particles of foreign matters such as ink and toner is stirred by a stirring blade 227, and fine bubbles are generated from the outlet 226 in the regenerated pulp-containing liquid. Blowing and adhering hydrophobic foreign particles to the surface of the bubbles of the surfactant to separate and float, and deinking by transferring hydrophilic fibers from the opening on the upper end side of the partition wall 223 to the rear tank 222. At this time, the recycled pulp-containing liquid is heated to a predetermined temperature by the heaters 224 and 225, and the temperature is controlled by the temperature sensor 228. By this temperature control, the temperature environment of the flotation tank composed of the front tank 221 and the rear tank 222 is maintained at an optimal set temperature according to the type of the deinking object, that is, according to the ink or toner.

  The rinsing unit 23 is for cleaning the deinking agent from the deinked pulp, and has the configuration shown in FIG. 5 in the present embodiment. The rinsing portion 23 has a mesh belt 233 stretched between rolls 231 and 232 on both sides, and the mesh belt 233 forms an endless track composed of an upper outward track and a lower return track.

  A hopper 234, a cleaning nozzle 235, and a press roll 236 are sequentially arranged from the start end side to the end side on the outward track, and a scraper 237 is disposed on the start end side of the return track. 238 is arranged.

  The hopper 234 supplies the deinked pulp-containing liquid including the deinked pulp 239 onto the mesh belt 233, and the plurality of cleaning nozzles 235 have the cleaning water toward the deinked pulp 239 spread on the mesh belt 233. Inject. Wash away foreign particles such as ink and toner remaining on the fiber and deinking agent with washing water.

  The press roll 236 is paired up and down across the mesh belt 233 and presses and dehydrates the deinked pulp 239 spreading on the mesh belt 233. The deinked pulp 239 that has been rinsed is collected from the mesh belt 233 by the scraper 237, mixed with water so that the fiber concentration is about 0.5% by weight, and sent to the papermaking unit 3. The desorbed water separated from the deinked pulp 239 is received by the drain pan 238 and sent to the waste water treatment unit 5.

  In the present embodiment, a configuration in which the deinking unit 22 is formed of one flotation tank is disclosed, but the present invention includes a form in which a plurality of flotation tanks are arranged in parallel or in series. Heater heaters 224 and 225 are disposed in the front tank 221 and the rear tank 222 of each flotation tank, respectively, and a fine bubble jet port 226 and a stirring blade 227 are disposed in the front tank 221. Is provided with a temperature sensor 228.

  Each flotation tank is adjusted to a different set temperature. That is, each flotation tank corresponds to a different deinking object, the set temperature set for each flotation tank is the optimum temperature for each deinking object, and the set temperature for each flotation tank is The temperature is set sequentially from the previous flotation tank to the subsequent flotation tank.

  For example, the set temperature of the upstream flotation tank is 20 ° C. or more and 80 ° C. or less corresponding to the toner, and the set temperature of the subsequent flotation tank is 60 ° C. or more and 100 ° C. or less corresponding to the ink.

  As shown in FIG. 15, this temperature setting takes into consideration that the influence of the temperature environment on the deinking effect differs depending on the type of the deinking object. That is, the toner can obtain a sufficient deinking effect at 40 ° C., but the deinking effect decreases at 80 ° C., and the deinking effect becomes slight at 90 ° C. The pigment-based ink has a slight deinking effect at 40 ° C., but the deinking effect is enhanced at 80 ° C. and 90 ° C.

  With this configuration, as shown in FIG. 14, the deinked pulp 239 that has been deinked in one flotation tank is rinsed in the rinse section 23, and the deinked pulp 239 that has been rinsed is put into another flotation tank. The deinked pulp 239 that has been deinked is rinsed by the rinsing unit 23, diluted to a predetermined fiber concentration, and sent to the papermaking unit 3.

Thus, the deinking pulp section 2 has the heaters 224 and 225 and the temperature sensor 228 for each flotation tank, and forms an optimum temperature environment according to the type of the deinking object for each flotation tank. Therefore, when processing recycled pulp with different types of deinking objects, the optimum temperature environment for the deinking object can be determined in any one of the flotation tanks without confirming the type of deinking object in advance. Realize and process quickly. In addition, each deinking object is reliably processed in the optimum temperature environment by sequentially processing in each temperature environment while moving from the flotation tank in the low temperature environment to the flotation tank in the high temperature environment. can do.
(Paper making)
The paper making unit 3 makes a deinked pulp to prepare recycled paper, and includes a head box 31, a wire unit 32, a dehydrating unit 33, a press unit 34, and a dryer unit 35 as shown in FIG.

  The wire portion 32 has a mesh belt 323 stretched between rolls 321 and 322 on both sides, and the mesh belt 323 forms an endless track. The mesh belt 323 is uniformly ejected with deinked pulp-containing liquid including deinked pulp 239 from the head box 31 and drained to form a fiber tank.

  The dewatering unit 33 is composed of a pair of upper and lower water absorbing belts 332 made of felt stretched between a plurality of rollers 331, and transfers the paper 333 made from the mesh belt 323 to the water absorbing belt 332, and between the upper and lower water absorbing belts 332. Water is sandwiched between and dehydrated. The water absorbing belt 332 dehydrates between a pair of upper and lower dewatering rollers 334 provided on the traveling track.

  The press unit 34 is composed of a pair of upper and lower water absorption belts 342 made of felt that is stretched between a plurality of rollers 341. To do.

The dryer unit 35 sandwiches the paper 333 formed between a pair of upper and lower cloth conveyor belts 352 spanned between a plurality of rollers 351, and presses the plurality of drying rollers 353 to dry the paper 333 formed. In addition to the cloth, the transport belt 352 may be made of a material such as rubber or resin. As shown in FIG. 6, the dryer unit 35 includes a temperature sensor 354 that measures the temperature of the surface of the drying roller 353 by disposing a conveying belt 352 around a drying roller 353 provided with a heater therein.
(Finishing part)
The finishing section 4 has a calendar section 41. As shown in FIG. 7, the calendar section 41 passes the paper 333 made between a plurality of press rollers 411 to increase the flatness of the paper, and the cutting section (illustrated). The sheet is cut into a predetermined sheet size to complete the recycled paper.
(Wastewater treatment department)
The waste water treatment unit 5 has a tank body of a waste water disaggregation tank 51, a waste water (paper making) tank 52, a waste water (rinse) 53, a waste water deinking 54, and a waste water treatment unit 55, and in each process related to the production of recycled paper. It is used to treat the discharged wastewater. The fiber, ink, and toner are removed through a filter, neutralized by the addition of chemicals, and supplied to each process again. Water that is difficult to reuse is treated to a quality that can be drained into public sewage.
(Control part)
As shown in FIG. 8, the control unit 7 has the following functional units as functional circuits set in the CPU 71. That is, a regenerated pulp unit control function unit 711 that controls the operation of the regenerated pulp unit 1, a deinking pulp unit control function unit 712 that controls the operation of the deinking pulp unit 2, and a paper making unit that controls the operation of the paper making unit 3 The control function unit 713, the finishing unit control function unit 714 that controls the operation of the finishing unit 4, the waste water treatment unit control function unit 715 that controls the operation of the waste water treatment unit 5, and the operation process from the start of operation to the stop of operation. An automatic operation control function unit 716 that executes sequentially, and an operation lock control function that inputs an operation start permission instruction or a disapproval instruction to the automatic operation control function part 716 in accordance with the presence / absence signal of a cut piece of paper input from the paper amount detection sensor 125 Unit 717, a target number setting function unit 718 for setting the target number of recycled paper to be prepared, a counter function unit 719 for counting the number of prepared recycled paper, and the recycled pulp unit 1. A pulp portion 2 and paper making section 3 drainage work control function unit 720 and the cleaning operation control function unit 721 which performs a predetermined cleaning operation is performed a predetermined drainage work at the end of the operation in.

  In addition, the control unit 7 includes a timing input unit 73 and a display unit 74 for inputting at least one of operation start and operation stop timings as an instruction signal to the automatic operation control function unit 716. The timing input unit 73 includes: In the present embodiment, an internal clock is provided inside the control unit 7, and an instruction signal is input to the automatic operation control function unit 716 when the internal clock reaches a scheduled time. However, the timing input unit 3 can also be an input port for inputting an instruction signal issued when an external clock arranged outside the control unit 7 reaches a scheduled time or an instruction signal issued from an external device. .

The control unit 7 performs the above-described operation in the regenerated pulp unit 1, the deinking pulp unit 2, the paper making unit 3, the finishing unit 4, and the waste water treatment unit 5, respectively, as a regenerated pulp unit control function unit 711 and a deinking pulp unit control function unit. 712, a papermaking section control function section 713, a finishing section control function section 714, and a wastewater treatment section control function section 715.
(Operation control)
Control from the start to the stop of the automatic operation by the control unit 7 is performed along the flow sheet shown in FIG. That is, from the stop state 900, the operation start condition check 910, the operation preparation work 920, the recycled paper preparation 930, the operation stop condition check 940, and the stop preparation work 950 are performed, and the apparatus stop 960 is obtained.

  In the operation start condition check 910, as shown in FIG. The operation start signal is an instruction signal input from the timing input unit 73 to the automatic operation control function unit 716. In the present embodiment, the operation start signal is an instruction signal input when the internal clock reaches the scheduled time. However, the operation start signal may be an instruction signal issued when the external clock reaches a scheduled time or an instruction signal issued from an external device.

  Next, when there is an operation start signal, a determination 912 is made as to whether or not there is a cut piece of paper inside the shredder tank 12. The control unit 7 inputs an operation start permission instruction or a non-permission instruction to the automatic operation control function unit 716 according to the presence / absence signal of the cut paper piece input from the paper amount detection sensor 125 by the operation lock control function unit 717. For this reason, when the presence / absence signal indicates that there is no amount of cut paper pieces necessary for operation in the shredder tank 12, the operation lock control function unit 717 issues a non-permission instruction to the automatic operation control function unit 716. Since the automatic operation control function unit 716 is not activated, power consumption can be suppressed without performing unnecessary operation. At this time, the control unit 7 indicates on the display unit 74 as warning information that the shredder tank 12 does not have an amount of cut paper pieces necessary for operation. A warning display reset 913 is performed when an amount of cut paper pieces necessary for operation is accumulated in the shredder tank 12.

  When the operation lock control function unit 717 issues an operation start permission instruction, it is determined that the amount inside the shredder tank 12 is equal to or greater than the required amount, that is, at least one processing amount performed by the pulper 14.

  In the operation preparation work 920, as shown in FIG. 12, water is injected into the tank 921. Water is poured into the remaining portions at a predetermined timing as necessary. That is, a required amount of water is injected into the pulper 14 and the deinking unit 22.

Next, the heaters 143, 224, and 225 of the pulper 14 and the deinking unit 22 are energized, and further the heater (not shown) of the drying roller 353 is energized to perform the heating operation 922.
Next, it is determined 923 whether or not the water temperature of the pulper 14 and the deinking unit 22 measured by the temperature sensors 144 and 228 and the surface temperature of the drying roller 353 measured by the temperature sensor 354 have reached the set temperature.

  In the recycled paper production 930, the recycled pulp section control function section 711, the deinking pulp section control function section 712, the papermaking section control function section 713, the finishing section control function section 714, and the wastewater treatment section control function section 715 are respectively used. 1, the deinking pulp section 2, the papermaking section 3, the finishing section 4, and the wastewater treatment section 5 are controlled to perform the above-described operation.

Here, as described above, the deinking pulp unit control function unit 712 performs the deinking process while controlling the temperature environment of the flotation tank to a set temperature optimum for the deinking target.
In the operation stop condition check 940, as shown in FIG. 11, it is determined 941 whether or not the end time has been reached. This end time is instructed by an instruction signal input from the timing input unit 73 to the automatic operation control function unit 716. In this embodiment, the end time is an instruction signal input when the internal clock reaches the scheduled time. It may also be the time after the scheduled time has elapsed since the start of operation. When it is the end time, the process proceeds to the stop preparation work.

  If it is not the end time, a determination 942 is made as to whether or not the set amount of processing has been completed. The control unit 7 counts the number of times the paper making unit 3 is driven, or detects the completed recycled paper by a sensor (not shown) provided in the finishing unit 4, thereby determining the target number of the prepared recycled paper. In 719, the operation is stopped when the count value of the counter function unit 719 reaches the target number set by the user in the target number setting function unit 718. Therefore, excessive operation is suppressed and only the minimum operation required by the user is realized. When the processing for the set amount is completed, the process proceeds to stop preparation work.

  When the processing for the set amount is not completed, the paper amount detection sensor 125 confirms 943 whether or not there is a cut paper piece inside the shredder tank 12. When there is no cut paper piece, a warning 944 is displayed on the display unit 74, and the process proceeds to the stop preparation work. If there is a piece of cut paper, continue operation.

  In the stop preparation work 950, as shown in FIG. 13, whether the surface temperature of the drying roller 353 measured by the temperature sensor 354 is equal to or lower than the set temperature by performing an operation to stop 951 energization of the heaters 143, 224, 225 A determination 952 of whether or not is performed, and a fiber and water treatment 953 is performed.

  In the fiber and water treatment 953, operation control is performed by the drainage work control function unit 720, the fibers remaining in the papermaking unit 3 are sent to the final position and reused, the other fibers are treated for disposal, Remove foreign material, return to neutral with chemicals and discharge.

  Next, the drive is stopped 954, and in cleaning 955 of each part, the operation is controlled by the cleaning work control function unit 721, and the fibers adhering to the tank and the belt are automatically washed away with water. Next, in the treatment 956 for generated dust, moisture is removed from both the fiber and the ink to solidify.

  In this way, the control unit 7 controls the recycled pulp unit 1, the deinking pulp unit 2, and the paper making unit 3 by the drainage work control function unit 720 and the cleaning work control function unit 721. By performing this cleaning operation, each part of the apparatus can be kept clean at all times, and as a result, the quality of recycled paper can be maintained.

  As described above, in the present embodiment, the deinking pulp unit 2 has the heaters 224 and 225 and the temperature sensor 228 for each flotation tank, and according to the type of the deinking object for each flotation tank. By forming the optimal temperature environment, when processing recycled pulp with different types of deinking objects, the optimal temperature environment for the deinking object can be determined without checking the type of deinking object in advance. It can be realized in any flotation tank and processed promptly. In addition, each deinking object is reliably processed in the optimum temperature environment by sequentially processing in each temperature environment while moving from the flotation tank in the low temperature environment to the flotation tank in the high temperature environment. can do.

  Further, in the present embodiment, the operation control by the automatic operation control function unit 716 can automatically start and stop the operation even when the user is not present, and can perform unmanned operation at any time. Become. However, in the present embodiment, providing the manual start key and the manual stop key in the control unit 7 and manually operating the start and stop of the operation does not hinder the implementation of the present invention.

Schematic diagram showing a used paper processing apparatus in an embodiment of the present invention Schematic showing the recycled pulp section of the used paper processing equipment Schematic diagram showing the action of the fiber concentration adjustment section in the recycled pulp section of the used paper processing equipment Schematic diagram showing the deinking section of the used paper processing equipment Schematic showing the rinse part of the used paper processing equipment Schematic showing the drying roller of the used paper processing equipment Schematic diagram showing the press roller of the used paper processing equipment Block diagram of the control unit of the used paper processing device Flow sheet showing the control of the used paper processing equipment Flow sheet diagram showing operation start condition check in the same control Flow sheet diagram showing operation stop condition check in the same control Flow sheet diagram showing operation preparation work in the same control Flow sheet diagram showing stop preparation work in the same control Flow sheet showing how to operate the deinking section Chart showing deinking effect

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Regenerated pulp part 2 Deinking pulp part 3 Paper making part 4 Finishing part 5 Waste water treatment part 6 Waste paper 7 Control part 11 Shredder 12 Shredder tank 13 Fiber density adjustment part 14 Pulper 21 Pre-deinking dilution part 22 Deinking part 23 Rinse part 31 Head box 32 Wire section 33 Dewatering section 34 Press section 35 Dryer section 41 Calendar section 51 Drainage disaggregation tank 52 Drainage (papermaking) tank 53 Drainage (rinse)
54 Wastewater deinking 55 Wastewater treatment part 61 Cut paper piece 71 CPU
73 Timing input unit 74 Display unit 121 Upper opening 122 Bottom surface 123 Discharge port 124 Discharge device 125 Paper amount detection sensor 131 Receptacle part 131a Receptacle 131b Side wall part 132 Weighing part 141 Tank body 142 Stirring blade 143 Heater 144 Temperature sensor 221 Front tank 222 Rear Tank 223 Partition wall 224, 225 Heater 226 Spout 227 Stirring blade 228 Temperature sensor 231, 232 Roll 233 Mesh belt 234 Hopper 235 Cleaning nozzle 236 Press roll 237 Scraper 238 Drain pan 239 Deinking pulp 321, 322 Roll 323 Mesh belt 331 Roller 332 Water absorbing belt 333 Paper 334 Dehydrated roller 351 Roller 352 Conveying belt 353 Drying roller 354 Temperature sensor 411 Press roller 711 Recycled pulp section controller Function section 712 Deinking pulp section control function section 713 Paper making section control function section 714 Finishing section control function section 715 Wastewater treatment section control function section 716 Automatic operation control function section 717 Operation lock control function section 718 Target number setting function section 719 Counter function 720 Drainage work control function part 721 Cleaning work control function part

Claims (4)

Recycled pulp section that separates waste paper pieces to prepare recycled pulp, deinked pulp section that bleaches recycled pulp and prepares deinked pulp, and papermaking section that makes deinked pulp and prepares recycled paper And a control unit for controlling the operation of each unit,
The deinking pulp section has a plurality of flotation tanks, and has heating means and temperature sensors for adjusting the deinked pulp-containing liquid in each flotation tank to an arbitrary set temperature, for each flotation tank,
The set temperature set for each flotation tank should be adjusted according to the different deinking object for each flotation tank and adjusted to the optimum temperature for each deinking object for each flotation tank. Used paper processing equipment. 2. The waste paper processing according to claim 1, wherein the deinking pulp section includes at least two tanks, a flotation tank having toner as a deinking object and a flotation tank having ink as a deinking object. apparatus. 2. The deinking pulp section is characterized in that the set temperature of the front flotation tank is adjusted to the optimum temperature for the toner, and the set temperature of the subsequent flotation tank is adjusted to the optimum temperature for the ink. Or the waste paper processing apparatus of 2. In the deinking pulp section, the set temperature of the front flotation tank is 20 to 80 ° C. corresponding to the toner, and the set temperature of the subsequent flotation tank is 60 to 100 ° C. corresponding to the ink The used paper processing apparatus according to claim 1 or 2.

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