JP2006009179A - Method for unpacking and feeding baled waste paper, and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for unpacking and feeding baled waste paper for controlling a pulp concentration determining the quality of paper at constant by which a control state can automatically be transferred to the optimum control state even if the control state is positioned at any zone, and the maintenance of the paper quality at the high quality is achieved inexpensively; and to provide an apparatus therefor. <P>SOLUTION: The method for unpacking and feeding the baled waste paper comprising unpacking the baled waste paper 101 in a conveying step, weighing the unpacked waste paper, charging the weighed waste paper to a pulper 170, feeding dilution water to the pulper to form a pulp having a prescribed concentration from the waste paper, and discharging the pulp to a storing tank of the following step involves not only detecting the concentration of the pulp discharged from the pulper but also detecting the liquid level of the storing tank 180 to control the fed amount of the dilution water and the fed amount of the waste paper based on the detected pulp concentration signal and the tank liquid level signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for unpacking and feeding bale waste paper, and more particularly, to a method and apparatus for unpacking and feeding waste paper for controlling the pulp concentration that determines the quality of the paper to be constant.

  In the papermaking process in a paper mill, the used waste paper, that is, bale waste paper, is unpacked in the process of being transported by a belt conveyor, etc., and the unpacked waste paper is weighed and put into a dissolution tank, ie, a pulper. Diluted water is supplied into the waste paper to dissolve the waste paper, and the pulp dissolved at a constant concentration is discharged to a storage tank in the next step.

  Thus, maintaining a constant concentration of pulp discharged from the pulper is important in maintaining paper quality. For this reason, in this field, the pulp concentration is controlled in consideration of the amount of waste paper that is input to the pulper, the amount of dilution water that is used to dissolve the wastepaper that is input, or the liquid level in the pulper. Has been done.

  Conventionally, as described above, unpacked bale waste paper is conveyed in the process of being conveyed by a belt conveyor, etc., and the unpacked waste paper is put into the pulper while weighing, and the concentration of the waste paper dissolved in the pulper is controlled. As an unpacking supply method and apparatus therefor, for example, in Patent Document 1, the concentration of pulp dissolved in a pulper is detected, and based on this detection signal, the inclination angle of the unpacking slat conveyor is changed to unpack the used paper. A bale waste paper unpacking supply method and apparatus for adjusting the supply amount have been proposed.

  However, if the inclination angle of the unpacking slat conveyor is variable, the structure of the unpacked bale paper unpacking / conveying unit becomes complicated, which increases the cost of the entire apparatus. In addition, since this type of pulp concentration control method and apparatus controls the liquid level in the pulper and the pulp concentration with independent control loops, for example, the pulp level is low and the pulp concentration is low. In a state where the liquid level in the pulper is high and the pulp concentration is high, there is a phenomenon that if the liquid level in the pulper is maintained, the deviation of the pulp concentration is further increased. The concentration control was impossible due to interference. In such a state, there has been a problem that the automatic control state must be switched to manual control.

  On the other hand, for example, in Patent Document 2, for example, the concentration of pulp discharged from the pulper is detected, the liquid level in the pulper is detected, and the waste paper and white water to be fed into the pulper based on these two signals. A method and an apparatus for unpacking and supplying used paper in which the amount of paper is controlled have been proposed.

However, even in such a method of unpacking and supplying waste paper and its apparatus, it is difficult to equalize the amount of waste paper fed into the pulper. There was a built-in problem that the quality of the waste paper itself deteriorates due to fluctuations and fluctuations in the power unit load of the pulper itself.
Japanese Patent Laid-Open No. 7-207590 (Japanese Patent No. 2670975) JP-A-5-9882 (Patent No. 3003284)

  The present invention has been made in view of the above-described circumstances, and the object of the present invention is a method and an apparatus for unpacking and supplying used paper for controlling the pulp concentration that determines the quality of the paper to be constant. A method and an apparatus for unpacking and supplying waste paper that can automatically shift to an optimal control state regardless of the zone in which the control state is located, and that can maintain low paper quality at a low cost. It is to provide.

  The above object of the present invention is to unpack the bale waste paper in the process of transporting it, weigh the unpacked waste paper and put it into the pulper, and supply diluted water to the pulper to make the waste paper a pulp with a predetermined concentration. In the method for unpacking and supplying waste paper to be discharged to the storage tank in the next step, the pulp level signal detected by detecting the concentration of the pulp discharged from the pulper and the liquid level of the storage tank, And waste paper, wherein the pulp concentration and liquid level in the pulper are kept constant by controlling the supply amount of the dilution water and the input amount of the waste paper based on the tank liquid level signal. This is achieved by providing an unpacking supply method.

  Further, the above object of the present invention is characterized in that when the liquid level detection value of the storage tank is higher than a set value, the waste paper pulp in the storage tank is fed back into the pulper. This is accomplished more effectively by providing an unpacking supply method.

  Further, the above object of the present invention is to unpack in the process of transporting the bale waste paper, weigh the unpacked waste paper and put it into the pulper, supply dilution water to the pulper to make the waste paper into a pulp with a predetermined concentration. After that, in the used paper unpacking and feeding apparatus for discharging to the storage tank of the next process, the supply means for supplying the bale waste paper at a constant lifting angle on the unloading side, and the unloading side of the supply means An unloading means provided above the leading end portion with a predetermined interval from the conveying means and moving in a direction opposite to the supply direction of the supplying means, and the waste paper unpacked by the supplying means and the unloading means A conveying means comprising at least one stage for conveying to the pulper; and a control means for adjusting the speed of each of the conveying means based on a liquid level control setting value at a constant concentration in the pulper. It is achieved by providing a unpacking supply device of the used paper for.

  Furthermore, the object of the present invention is to provide a used paper unpacking and feeding device, wherein the feeding means and the transporting means are slat conveyors, and the unloading means is an auxiliary conveyor that rotates in a direction opposite to the feeding means. Is achieved more effectively.

  According to the method for unpacking and supplying waste paper according to the present invention, unpacking is performed in the process of conveying the bale waste paper, the unpacked waste paper is weighed and put into the pulper, and diluted water is supplied to the pulper to supply the wastepaper. In a method for unpacking and supplying used paper that is discharged to a storage tank in the next process after making a pulp with a predetermined concentration, the concentration of the pulp discharged from the pulper is detected and the liquid level of the storage tank is detected. In addition, since it is configured to control the supply amount of the dilution water and the input amount of the used paper based on the detected pulp concentration signal and the tank liquid level signal, fluctuations in the amount of pulp raw material used in the storage tank The pulper operation can be adjusted according to the operation, and the pulp concentration and liquid level in the storage tank can be reduced and the operation efficiency of the pulper can be increased. It is possible to produce a pulp raw material of quality.

  Further, according to the used paper unpacking and supplying apparatus according to the present invention, the unpacked bale paper is unpacked in the process of transporting, the unpacked used paper is weighed and put into the pulper, and diluted water is supplied to the pulper. In the used paper unpacking and feeding device, after making the used paper into pulp of a predetermined concentration, the waste paper is unpacked and supplied to the storage tank in the next process, and comprises a slat conveyor and the like that supplies the unloaded bale paper with a constant rising angle on the unloading side. A load comprising a supply means and a slat conveyor provided above the unloading side tip of the supply means at a predetermined interval and moving in the same direction as or opposite to the supply direction of the supply means. Crushing means, conveying means comprising at least one-stage slat conveyor for conveying the waste paper unpacked by the supply means and the crushing means to the pulper, and a constant in the pulper Since it is provided with a control means for adjusting the speed of each of the conveying means based on the liquid level control setting value at a lower level, even if a fluctuation occurs in the amount of pulp raw material used in the storage tank, this fluctuation is followed. A pulp raw material with a certain concentration can be supplied from the pulper, and the amount of used paper supplied to the pulper can be increased evenly. Can be manufactured.

  The contents of the used paper unpacking and feeding apparatus according to the present invention will be described below together with the unpacking and feeding method. The present invention is not necessarily limited to the following embodiments, and it goes without saying that the configuration can be changed to various ones without departing from the scope of the claims.

  FIG. 1 is a structural block diagram of a bale waste paper unpacking supply method and apparatus (hereinafter referred to as “this unpacking supply method and apparatus”) according to an embodiment of the present invention. In FIG. An apparatus (hardware) system constituting the method and apparatus is shown, and a control (software) system 200 drives and controls the apparatus (hardware) system 100. In the control (software) system 200, SP (set point) indicates the presence of a set value, PI indicates proportional integral control, PV (process value) indicates control in which a variable is generated, and r (relay) indicates related control. CRC indicates concentration control, and FC indicates flow rate control.

  In the apparatus (hardware) system 100, 101 is a bale waste paper before unpacking which becomes a papermaking raw material, 110 is a supply conveyor for supplying the bale waste paper 101, 120 is inclined upward with a slat conveyor 120A on the loading section side. The slat conveyor 130 for supplying and unpacking the bale waste paper 101, comprising the slat conveyor 120B on the unloading side, is provided with a gap A above the slat conveyor 120B, and rotates in a direction opposite to the slat conveyor 120B. Auxiliary conveyor that moves and disperses the waste bale paper 101 roughly or densely, 140 is a slat conveyor that conveys the waste paper 101A that has been dispersed and collapsed, 150 is a belt conveyor that conveys the waste paper 101A, and 160 is inclined upward. , A belt conveyor that conveys the used paper 101A at a constant speed, 170 is a belt conveyor Dispersing used paper 101A that is turned by 60, fragmenting to pulper 180 is a storage tank for storing the used paper pulp 101B supplied from pulper 170.

Bale waste paper 101 is usually pressed and solidified with a high pressure of 120 to 150 kg / cm ³ with a baler to give a certain amount of waste paper from the viewpoint of transportation and storage, and the weight is about 1 ton, height 1 m × width It is packed with a wire in a size of about 1m x 2m.

  The supply conveyor 110 is driven by the rotation of the motor 111 and supplies the bale waste paper 101 onto the slat conveyor 120A. A sensor 112 is provided above the slat conveyor 120A to detect the amount of the used paper 101A that has been dispersed and collapsed. When the sensor 112 detects that the used paper 101A on the slat conveyor 120A has fallen below a predetermined amount, The motor 111 is configured to rotate via the controller 201.

  The slat conveyor 120 for supplying and unpacking is a known one in which a large number of slat link plates are continuously attached to the conveyor chain, whereas the slat conveyor 120A on the loading part side is arranged substantially flat, The slat conveyor 120B on the unloading part side is connected to the rotary shaft part on the tip side of the slat conveyor 120A with a constant (for example, around 40 degrees) ascending angle. The slat conveyor 120B is provided with a motor 121, and is configured to rotate based on a command from the controller 202. The rising angle of the slat conveyor 120B can be set to an arbitrary angle by manually changing the position of the air cylinder or fixing screw that defines and holds this angle as necessary. Thus, the gap A with respect to the auxiliary conveyor 130 is adjusted by changing the rising angle of the slat conveyor 120B. The gap A is set to a desired value that allows easy unpacking according to the shape and size of the bale waste paper 101.

  The auxiliary conveyor 130 is provided with a motor 131, and is configured to rotate in the opposite direction to the motor 121 of the slat conveyor 120B based on a command from the controller 202. The driving direction of the auxiliary conveyor 130 is preferably the opposite direction to the slat conveyor 120 from the viewpoint of dispersion and load collapse efficiency. However, if necessary, this direction may be the same direction. It can also be installed flat.

The bale waste paper 101 supplied from the supply conveyor 110 to the slat conveyor 120A is:
The large bale waste paper 101 having a high center of gravity is transported to the unloading part side set at a predetermined rising angle by the operation of the slat conveyor 120B, and the gravity and the action of the auxiliary conveyor 130 are caused to move up the unloading part side. Upon receipt, it falls to the unloading part side. The bale waste paper 101 that has fallen to the unloading part side is unpacked by its own drop impact and rises again on the unloading part side. Note that the bale waste paper 101 that has not been fully unpacked is unpacked while being repeatedly dropped, and is dispersed and collapsed to a predetermined size.

  Thus, the used paper that has been dispersed and collapsed to a predetermined size (this used paper is represented by “101A”) is transferred from the supply conveyor 110 onto the conveying slat conveyor 140. The slat conveyor 140 is provided with a motor 141. The motor 141 is configured to rotate intermittently based on a command issued from the controller 203 in view of the manually input predetermined value and the next conveying state of the belt conveyor 150. That is, the slat conveyor 140 has a cushioning function for temporarily retaining the used paper 101A on the conveyor according to the conveyance status of the belt conveyor 150.

  The belt conveyor 150 is driven by the rotation of the motor 151. The belt conveyor 150 is provided with a weighing scale 152 for measuring the weight of the used paper 101A conveyed to the next belt conveyor 160. The measurement value obtained by the weigh scale 152 is sent to the controller 204, and the conveyance amount corresponding to the preset set value SP, that is, the liquid level control set value in the pulper 170 under a certain concentration of waste paper pulp, is automatically set. A desired rotational speed signal corresponding to the transport amount is calculated and sent to the motor 151 via the controller 205, whereby the driving speed of the belt conveyor 150 is controlled. Further, the measurement value by the weighing scale 152 is sent to the motor 141 via the controller 203 and also sent to the motors 121 and 131 via the controller 202, whereby the slat conveyors 140 and 120 and the auxiliary conveyor 130 are sent. The driving speed is controlled. Similarly, the driving speed of the supply conveyor 110 can be controlled.

  Here, it is possible to configure the belt conveyor 150 as a slat conveyor, but in this transporting process, the used paper 101A to be transported is already dispersed and collapsed to a predetermined size, and its weight is reduced. It is preferable that the belt conveyor is inexpensive. In addition, if this belt conveyor 150 is given an ascending angle, it is possible to further enhance the dispersion and unloading effect of the used paper 101A.

  The belt conveyor 160 is driven by the rotation of the motor 161. Similarly to the above, the belt conveyor 160 is provided with a weighing scale 162 for measuring the weight of the used paper 101A to be put into the next pulper 170. The weigh scale 162 is provided in order to put the used paper 101A in an amount proportional to the pulp concentration in the pulper 170 into the pulper 170. As will be described later, a dilution water amount proportional to the waste paper input amount is supplied into the pulper 170 through the dilution water supply pipe 172. A measurement signal from the weigh scale 162 is sent to the controller 206, compared with a preset set value SP, calculated, and sent to the motor 161, so that the driving speed of the belt conveyor 160 is controlled. . The basic amount and the conveyance speed of the used paper 101A conveyed by the belt conveyor 160 are made constant through the above-described steps, and thus, the pulper 170 is dispersed and collapsed to a desired size. Waste paper 101A is fed at a constant rate at a constant rate. In addition, although it is desirable that the belt conveyor 160 has an inclination from the surface of dispersion and unloading, it can be installed in a form that is flat or a combination of inclination and flatness, if necessary. Further, if the input end of the belt conveyor 160 to the pulper 170 is given an arbitrary inclination, it is possible to suppress the nearby used paper 101A from being dropped due to the fall of the used paper 101A. The amount can be adjusted with higher accuracy than when the amount is flat.

  As described above, in the present unpacking and supplying method and apparatus, the input amount to the pulper 170 of the dispersed and unloaded wastepaper 101A can be controlled manually (or automatically). Can be adjusted arbitrarily, and by feeding back the arbitrary control to the preceding and following processes, it is possible to deal with incidental problems associated with the arbitrary adjustment.

  In the pulper 170, diluted water is supplied to the used paper 101A input from the belt conveyor 160 to prepare used paper pulp (slurry) having a predetermined concentration. The dilution water is supplied into the pulper 170 by an amount proportional to the input amount of the used paper 101A through the valve 171 whose opening / closing is controlled by a command from the controller 207 and the dilution water supply pipe 172 connected to the valve 171. . Ideally, the amount of the diluted water is converted and added in consideration of the amount of water contained in the used paper 101A. However, it is difficult to measure the water content of the used paper 101A that has been broken during conveyance. For this reason, it is realistic to measure moisture with the bale waste paper 101 in a packed state, and to perform moisture conversion according to the conveyance speed of the bale waste paper 101.

  When the dilution water is supplied, the used paper 101A is stirred and mixed by a stirrer 173 provided in the pulper 170, and dispersed and disaggregated into slurry-like used paper pulp (this used paper pulp is represented as “101B”). The waste paper pulp 101B thus dispersed and disaggregated is discharged from the bottom of the pulper 170 and sent to the storage tank 180 via the pump 174 and the delivery pipe 175. A concentration meter 176 for measuring the concentration of used paper pulp 101B discharged from the pulper 170 is provided in the middle of the delivery pipe 175, and a pulp concentration signal measured by the concentration meter 176 is sent to the control device 208. It is like that.

  A liquid level meter 181 for detecting the liquid level of the used paper pulp 101B is provided in the storage tank 180, and the detected tank liquid level signal is sent to the control device 208. In this unpacking and supplying apparatus, the opening / closing of the valve 171 is controlled via the controller 207 by the pulp concentration signal of the used paper pulp 101B and the tank liquid level signal, and this is necessary for preparing the used paper pulp 101B having a predetermined concentration. An amount of dilution water is supplied into the pulper 170 from the dilution water supply pipe 172. The waste paper pulp 101B stored in the storage tank 180 is discharged from the bottom of the storage tank 180, sent to the next process through the pump 182 and the delivery pipe 183, and used. The concentration control of the used paper pulp 101B is performed by detecting the concentration immediately after being sent from the delivery pipe 183 and adding diluted water to the delivery pipe 183 based on this detection signal.

  This unpacking and supplying method and apparatus detects the concentration of the used paper pulp 101B discharged from the pulper 170 and detects the liquid level of the storage tank 180, and dilutes based on the detected pulp concentration signal and the tank liquid level signal. By controlling the amount of water supplied and throwing used paper pulp 101A in proportion to the amount of dilution water into the pulper 170, the liquid level and pulp concentration in the pulper 170 are always kept constant, and the pulper The feed amount from 170 is kept constant. For this reason, in the present unpacking and supplying method and apparatus, the input amount of the used paper 101A at a constant liquid level is controlled based on the measured value of the weighing scale 162, and when the liquid level in the storage tank 180 becomes high. The used paper pulp 101B in the storage tank 180 is returned to the pulper 170 through a pump 177 and a reverse feed pipe 178 that are branched from the delivery pipe 175. When the liquid level in the storage tank 180 is lowered, an amount of used paper 101A corresponding to the measured value of the weight scale 162 is introduced into the pulper 170 via the belt conveyor 160 and dilution water is added by proportional control. The In addition, the used paper 101A is conveyed by the slat conveyor 120, the auxiliary conveyor 130, the slat conveyor 140, and the belt conveyor 150 according to the amount of the used paper 101A input.

  As described above, the present unpacking and supplying method and apparatus are configured so that the pulp concentration and the liquid level in the pulper 170 are always kept constant. The load of 170 can always be made uniform, and deterioration and cutting of the obtained disaggregation raw material fiber can be suppressed, and thereby paper of a constant quality can be manufactured. Further, the operation of the pulper 170 can be adjusted in accordance with the fluctuation of the amount of raw material in the storage tank 180, that is, the used paper pulp 101B, and the fluctuation of the pulp concentration in the storage tank 180 is suppressed by this, and the pulper 170 Therefore, it is possible to produce a pulp material of a certain quality at a low cost.

1 is a configuration block diagram of a bale waste paper unpacking and feeding apparatus according to an embodiment of the present invention.

Explanation of symbols

100 Equipment (Hard) System 101 Bale Waste Paper 101A Dispersed and Unloaded Waste Paper 101B Waste Paper Pulp 110 Supply Conveyor 111 Motor 112 Sensor 120 Slat Conveyor 120A (for Loading and Unpacking) Slat Conveyor 120B Slat conveyor 121) Motor 130 Auxiliary conveyor 131 Motor 140 Slat conveyor 141 Motor 150 Belt conveyor 151 Motor 152 Weigh scale 160 Belt conveyor 161 Motor 162 Weigh scale 170 Pulper 171 Valve 172 Diluted water supply pipe 173 Stirrer 174 Pump 175 Delivery pipe 176 Densitometer 177 Pump 178 Reverse feed pipe 180 Storage tank 181 Liquid level meter 182 Pump 183 Delivery pipe 200 Control (software) systems 201 to 207 Controller 2 8 controller

Claims (4)

Unpacking in the process of transporting the used bale paper, weighing the unpacked waste paper and feeding it into the pulper, supplying dilution water to the pulper to make the wastepaper a pulp with a predetermined concentration, and then into the storage tank of the next process In the method of unpacking and supplying waste paper to be discharged, the concentration of the pulp discharged from the pulper is detected and the liquid level of the storage tank is detected, and the detected pulp concentration signal and the tank liquid level signal are detected. A method for unpacking and supplying used paper, wherein the pulp concentration and the liquid level in the pulper are kept constant by controlling the supply amount of the dilution water and the input amount of the used paper. The used paper unpacking supply according to claim 1, wherein when the liquid level detection value of the storage tank is higher than a set value, the used paper pulp in the storage tank is fed back into the pulper. Method. Unpacking in the process of transporting the used bale paper, weighing the unpacked waste paper and feeding it into the pulper, supplying dilution water to the pulper to make the wastepaper a pulp with a predetermined concentration, and then into the storage tank of the next process In the unpacking and feeding apparatus for used paper discharged, a supply means for supplying the bale waste paper with a constant lift angle on the unloading side, and a conveying means above the unloading side front end portion of the supplying means. A load crushing means provided at an interval and moving in a direction opposite to the supply direction of the supply means, and at least one stage for conveying the waste paper unpacked by the supply means and the load collapse means to the pulper. A used paper unpacking and feeding apparatus comprising: a conveying means; and a control means for adjusting the speed of each of the conveying means based on a liquid level control setting value at a constant concentration in the pulper. 4. The used paper unpacking and feeding apparatus according to claim 3, wherein the feeding means and the conveying means are slat conveyors, and the load collapse means is an auxiliary conveyor that rotates in a direction opposite to the feeding means.

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