JPH02234992A - Separator for papermaking and treatment thereof - Google Patents

Abstract

PURPOSE:To increase finely selecting and treating ability of useful fiber and foreign matters by dividing a closed casing into a pretreating chamber and an after-treatment chamber by a screen, connecting a washing water feed channel to the pretreating chamber, equipping the pretreating chamber with an impeller and equipping the after-treating device with an outlet of finely selected raw material and an exhaust port of fine foreign matters. CONSTITUTION:A closed casing 2 is divided into a pretreating chamber 3 and an after-treatment chamber 4 by a screen 1. A rotary impeller 5 is laid close to the screen 1 in the interior of the pretreating chamber 3 and a breaking agitating blade 8 is set at the opposite position to the impeller. A raw material feed pipe 11 for papermaking and a washing water feed pipe 13 are connected to the pretreating chamber 3. The after-treatment chamber 4 is equipped with a screen bucket 9 and provided with an outlet 12 for finely selected raw material and an exhaust port 10 of fine foreign matters.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applicable to the treatment of undisintegrated fragments in the treatment of new bulp products, the treatment of waste paper such as newspapers and magazines, etc. A paper manufacturing separation device for paper manufacturing screens that disintegrates disintegrated pieces from paper manufacturing raw materials containing foreign substances (metal pieces, stones, plastic pieces, styrene pieces, vinyl pieces) and discards the foreign substances outside the system. It is related to. [Prior art] In general, in paper manufacturing equipment such as new pulp production processing, waste paper processing, and waste paper processing, undisintegrated pieces in a fiber suspension that is a raw material are disintegrated, and stones, sand, metal pieces, and resin pieces are disintegrated. Foreign objects such as
In order to remove other debris, a screen device is used in which the inside of the sealed casing is divided into compartments using screen plates with a large number of round holes or slits, and in combination with this screen device, the screen rotates at high speed to disintegrate the screen tail. High-speed disintegration machines equipped with impellers are known. When processing rejection using this screen device,
Conventionally, as shown in FIGS. 5(A) and 5(B), a round hole screen device sl and a slit screen device S8 are arranged in series on the main line A, and the round hole screen tail and the slit screen tail are separated from each other. Disintegrator B, B,
After disaggregating them, place them in chests C and C. and Bomp D. D. Through the round hole tail screen device
s and the slit tail screen device S4 (
Fifth. (A)), or the screen tails of the round hole screen device sI and the slit screen device St are combined together and sent to the disintegrating machine B using Chest C and pump D, and then disintegrated using Chest C and pump D. D1, rough selection with round hole tail screen device Ss, and then processing with slit tail screen device S◆ (Fig. 5 (B)
)) is being carried out. [Problems to be Solved by the Invention] However, in this conventional processing system, foreign matter in each screen tail is likely to be reduced to fine particles by the high-speed disintegrator, the processing system becomes complicated and expensive, and the round hole tail screen device ．． Foreign matter may fall on the hydrofoil, i.e., the agitator, of the slit tail screen device, causing operational troubles, and many foreign matter that return to the screen device may cause clogging of the screen, which is undesirable and also reduces the separation function. The pump capacity had to be increased, and if the tail screen device was used alone, there was a problem in that undisintegrated pieces were discharged as lees, resulting in poor yield. The present invention aims to accurately eliminate these conventional drawbacks, and it is possible to increase the selection processing capacity for separating useful fibers from foreign substances, reduce the discharge of undisintegrated pieces, and enable high-speed disintegration. The screen tail processing system is simple, as foreign matter is not crushed by the machine, improving product quality, and the operation and operating time of the disintegrating function can be adjusted depending on the amount and nature of undisintegrated pieces in the raw material, and the degree of foreign matter crushing can also be adjusted. The purpose of this project is to provide an inexpensive device and operating method that can greatly increase the recovery of useful fibers. [Means for Solving the Problems] The present invention provides a sealed screen for separating the raw material introduced from the raw material inlet for grinding into useful fibers and impurities. A separation mechanism is installed in the casing that divides the room into a pre-treatment chamber and a post-treatment chamber, and a rotating impeller is installed in the pre-treatment chamber in close proximity to the screen. In the apparatus, a rotary impeller is provided in the pretreatment chamber to disturb the swirling flow and eddy flow generated in the pretreatment chamber, and the selected raw material is connected to a flow path having a control valve in the rear chamber. This separator for paper manufacturing is characterized in that an outlet and a fine foreign matter discharge port are formed, and a wash water supply channel with a control valve is provided in communication with the pretreatment chamber. In addition, when the screen tail from the round hole screen device and the slit screen device is disintegrated in a closed casing with a screen, a step of disintegrating the remaining disintegrated pieces is included during the water filling step and the raw material passing operation step, and the screen tail is transferred to the closed casing. supply of raw materials and washing water, and coarse foreign matter. The operation of discharging fine foreign matter and selected useful fibers is performed by opening and closing control valves provided in each flow path, and during the raw material passing operation process, a timer or load or raw material inlet is connected. Priority is given to the detection of the pressure difference at the outlet that is activated first, and the process is moved to the disintegration process for the residual disintegrated pieces, and the useful fiber recovery/washing process, the coarse foreign matter discharge process, and the fine foreign matter discharge process are sequentially performed to complete each process. Another feature is that it operates continuously for a predetermined amount of time using a timer.

[For production]

The raw material supplied into the sealed casing 2 of the separator is agitated in the pretreatment chamber 3 by the impeller 5 rotating adjacent to the screen 1 and the stirring blades 8 for disintegration opposed thereto, and then released from the screen 1 into the usable material. The fibers are passed through, and foreign substances are separated without passing through the screen 1, and are removed from the pretreatment chamber 3 through the outlet path 7 and treated. An impeller 5 that rotates close to the screen 1 so as to wipe the screen surface is provided on the pretreatment chamber 3 side of the screen 1, and a stirring blade 8 that rotates at high speed is provided at the center on the opposite side of the impeller 5. The raw material fed into No. 3 is given swirl and vortex in the direction of rotation,
Due to the centrifugal force generated along with this, the coarse foreign matter in the raw material is blown to the outer circumferential wall of the pretreatment chamber 3, and is removed by the intermittent opening and closing of the control valve 4 of the outlet passage 14 while rotating on the circumferential wall. The disaggregated fibers that have passed through the screen 1 are separated together with the useful fibers in the screen bucket 9 in the swirling flow of the after-treatment chamber 4, and are then discharged from the discharge port 10 through the control valve v of the discharge flow path l6.
h is led out by opening/closing the control valve V, and if necessary, a portion is returned to the raw material flow path 1l for reprocessing by opening/closing the control valve V of the circulation flow path 15. Further, the useful fibers that have passed through the screen bucket 9 are taken out of the system from the selected raw material outlet 121 by opening and closing control of the control valve v2 of the flow path 12 and are processed in the next process. Timer or load or material inlet during run-through process. Priority is given to the detection of the pressure difference at the outlet that is activated first, and the process is moved to the disintegration process for the residual disintegrated pieces, and the useful fiber recovery/washing process, the coarse foreign matter discharge process, and the fine foreign matter discharge process are sequentially performed to complete each process. The machine is operated continuously for a predetermined amount of time using a timer to improve the disaggregation effect.
In addition to improving the ability to separate foreign substances, the device can also be made with a small pump capacity for supplying raw materials, significantly reducing running costs.

〔Example〕

Embodiments of the present invention will be explained with reference to FIGS. 1 to 4. The screen tail from the round hole screen device S1 and the slit screen device S2 in the main line A of papermaking raw materials is passed through the chest C and the pump D to the screen 1. Introduce into sealed casing 2. That is, a screen 1 is installed inside a sealed casing 2 to separate the raw material introduced from the papermaking raw material 6 into useful fibers and impurities. A separation mechanism is provided in which a pretreatment chamber 3 and a posttreatment chamber 4 are partitioned, and a rotating impeller 5 is provided in the pretreatment chamber 3 in close proximity to the screen 1, and coarse foreign matter separated by the separation mechanism. outlet 1
In a device equipped with an outlet flow path l4 connected to
A stirring blade 8 for disintegration that disturbs the swirling flow and vortex generated in the pretreatment chamber 3 is provided in the pretreatment chamber 3 opposite to the rotating impeller 5, or a rotating impeller stirs the swirling flow and vortex, and A flow path 12 with control valves V, , V, in the aftertreatment chamber 4
．． A selected raw material outlet 12I and a fine foreign matter discharge port 10 are formed in communication with each of the pretreatment chambers 16 and 16, and a washing water supply channel 13 with a control valve V3 is provided in communication with the pretreatment chamber 3, thereby forming a separation device for paper manufacturing. ．． In this case, the disintegration stirring blade 8 has a diameter smaller than that of the rotary inverter 5, for example, 1/30.
Dimensions and high speed e.g. 1000-3000 r. p. ■．
It is sufficient to provide a drive mechanism, for example, a motor 18, which rotates in reverse, at the same speed, or intermittently in reverse at a speed of A cylindrical screen bucket 9 is provided to divide the chamber into a selected raw material recovery chamber 19 and a fine foreign matter recovery chamber 20, and an agitator foil 21 that moves along the cylindrical screen bucket 9 is provided. In addition, it is preferable that the screen 1 installed in the sealed casing 2 is of a double separator type in which a round hole strainer is used and the screen basket 9 is combined as a slit screen. Furthermore, the raw material for papermaking is supplied tangentially to the closed casing 2 to generate a swirling flow, and this raw material and washing water are supplied and coarse foreign matter is removed. Each channel 11, 12. discharges fine foreign matter and selected raw materials. 13. 14,
15. The air-tight casing 2 is equipped with an exhaust passage 17 with an air bleed valve V, and the air passage 1
Manual valves Vs and Vq are attached to the control valves 1 and 12, and the control valves V and -V are repeatedly opened and closed as shown in Table 1 to perform separation processing.

[C... Valve closed Table 1 0... Valve open 0/C... Valve throttle i open, that is, after filling the screen with water, enter the raw material passing operation process,
Useful fibers are continuously drawn out of the flow path 12, but at the timer or load or raw material inlet. Priority is given to the detection of the pressure difference at the outlet which is activated first, and after the disintegration process of the remaining disintegrated pieces, the process of recovering and cleaning the selected raw material for useful fibers, the coarse foreign matter discharge process, and the fine foreign matter including the disintegrated fiber fraction are carried out. The discharge process is performed sequentially, and each process is operated continuously for a predetermined amount of time using a timer.
For example, foreign substances in the raw material cannot pass through the screen 1 and are gradually concentrated in the casing 2, which prevents the quality raw material from passing to the outlet. When the load of the timer or motor or the differential pressure at the inlet and outlet reaches a preset state, the control valve vl of the large mouth valve is closed, and the washing water is introduced into the casing 2 to remove the high-quality fibers remaining in the casing 2 to the outlet side. Collect it. After the high-quality fibers are collected, there is only water and foreign matter inside the casing, and the reject valve valve V. By fully opening the thread, foreign objects are thrown out of the thread. All these operations are automatically controlled and operated unmanned. In the process of disintegrating the remaining disintegrated pieces, a part of the waste liquid containing the disintegrated fibers is passed through the raw material supply channel 11 or pretreated. Control valves V, , V that discharge part of the selected raw material while circulating directly to chamber 3
, and other supply/discharge operations are performed using control valves Vl+V3+
V4+V! ,V? Close it to stop it and continue operation,
In the raw material passing operation step, a control valve V. which performs raw material supply, selected raw material discharge, and circulation of the entire amount of waste liquid containing fine foreign matter to the raw material supply path. V! , VS are opened, and other supply/discharge operations are performed using the control valve Vz. V*, Vb. V? Just close it, pause it, and run it continuously. Further, the hydrofoil 21 is controlled by the rotation of the motor 18 by a motor 24 through a rotating shaft 22 and a pulley 23 together with a rotating impeller 5, and is rotated at a speed of, for example, 300 to 800 rpm. p, m. Although it is configured to be driven by a single motor, it may also be configured to be driven in conjunction with a speed change or speed increasing mechanism or a clutch mechanism, and each control valve v1 to v and each detector . The timer is connected to a computer unit (not shown) of the data processing section, and constitutes a control circuit 1B, which records the amount of raw material processed, the type of raw material, etc. A/A/
The computer unit including the D converter and the D/A converter compares and processes internal fixed data and input data to control the motor that drives the rotary impeller 5 and stirring blade 8, and opens and closes the control valves V1 to V. It is best to operate the machine while controlling it and continuously displaying digital information on the display. In the figure, T is a timer, llp is a load, Δp is a differential pressure, and 25 is a base. [Effects of the Invention] The present invention provides a separation system in which a screen is disposed in a sealed casing and the room is partitioned into a pre-treatment chamber and a post-treatment chamber, and a rotating impeller is provided in the pre-treatment chamber close to the screen. In an apparatus equipped with a mechanism and a passage for discharging coarse foreign matter separated by the separation mechanism, a swirling flow occurs in the pretreatment chamber. A rotating impeller for agitating the vortex is disposed in the pretreatment chamber, and a selected raw material outlet and a fine foreign matter discharge port are respectively connected to a flow path with a control valve in the aftertreatment chamber, and a control valve is provided in the pretreatment chamber. By installing a wash water supply channel with a valve for communication, the relative speed difference between the raw material recirculation speed and the rotation speed of the impeller or these and stirring blades is increased to disintegrate undisintegrated pieces in the raw material and recover useful fibers. In addition to significantly increasing the rate of disintegration, the foreign matter is not crushed as much as a high-speed disintegration machine, and the degree of foreign matter crushing can be adjusted, improving product quality.It can accurately separate not only coarse foreign matter but also fine garbage, and its disintegration ability is very useful. This equipment has a high selection processing power to separate fibers and foreign substances, and the action of centrifugal force generated by high-speed rotation inside the casing and disturbance action disintegrates the disintegrated fragments and removes metal fragments and stones mixed into the raw material. Other foreign substances can be separated accurately and efficiently, and the amount of foreign substances recirculated to the separator can be reduced as much as possible, allowing safe operation without causing screen clogging. The operation and operation time of the disintegrating function can be adjusted depending on the amount and properties of disaggregated fragments in the raw material, and the degree of foreign matter crushing can also be adjusted, so the screen tail processing system can be simplified, and the raw material supply pump can be compact and inexpensive. A separation device capable of efficient screening work can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of an embodiment of the present invention, FIG. 2 is a plan view taken along line I-1 in FIG. 1, and FIG. 3 is a system diagram in use.
FIG. 4 is a flowchart of the treatment process, and FIGS. 5A and 5B are system diagrams of a conventional example in use. 1...screen, 2
...Casing, 3.. Pretreatment chamber, 4.. Aftertreatment chamber, 5.. Impeller, 6.. Inlet, 7.. Foreign matter outlet, 8.. Stirring blade, 9..・Screen bucket, 1
0...Discharge port, 11, 12, 13, 14, 1
5. 16. 17...Lump road, 18.24...Motor, ■1~V,...Control valve. Patent applicant Aikawa Iron Works Co., Ltd.

Claims (7)

[Claims] (1) A screen is placed in a sealed casing to separate the raw material introduced from the papermaking raw material inlet that communicates with the raw material flow path with a control valve into useful fibers and impurities. The apparatus is equipped with a separation mechanism which is arranged in a compartment divided into a processing chamber, a rotating impeller is provided in the pretreatment chamber in close proximity to the screen, and a guideway for the coarse foreign matter separated by the separation mechanism. A rotating impeller that disturbs the swirling flow and eddy flow generated in the pretreatment chamber is provided in the pretreatment chamber, and a selected raw material outlet and a fine foreign matter discharge port are formed, respectively, which are connected to a flow path with a control valve in the rear chamber. , and a washing water supply channel having a control valve is provided in communication with the pretreatment chamber. (2) A stirring blade for defibration is provided in the pretreatment chamber facing the rotary impeller, and the stirring blade for defibration has a smaller diameter than the rotary impeller and has a drive mechanism that rotates forward or reverse at high speed. 2. The apparatus of claim 1, comprising: (3) The post-processing chamber is provided with a cylindrical screen bucket to divide the chamber into a selected raw material recovery chamber and a fine foreign matter recovery chamber, and is equipped with an agitator foil that moves along the cylindrical screen. 3. A device according to claim 1 or 2. (4) The device according to claim 3, wherein the screen installed in the closed casing has a configuration that combines a round hole strainer and a slit screen basket. (5) When disintegrating the screen tail from the round hole screen device and the slit screen device in a closed casing with a screen, including a step of disintegrating the remaining disintegrated pieces during the water filling step and the raw material passing operation step, the closed casing The operation of supplying raw materials and washing water to the tank and discharging coarse foreign matter, fine foreign matter, and selected useful fibers is performed by opening and closing control valves installed in each flow path, and during the raw material passing operation process, Priority is given to the detection of the timer or the load or the pressure difference between the inlet and outlet of the raw material, whichever is activated first, and then transferred to the disintegration process of the remaining disintegrated pieces, and the useful fiber recovery/washing process, the coarse foreign matter discharge process, and the fine foreign matter discharge process. 1. A separation treatment method for paper manufacturing, characterized in that the steps are sequentially performed and each step is continuously operated for a predetermined period of time using a timer. (6) In the step of disintegrating the residual disintegrated pieces, the opening of the control valve is adjusted so that a part of the waste liquid containing fine foreign matter is circulated to the raw material supply path and a part of the selected raw material is discharged. 6. The method according to claim 5, wherein the supply/discharge operation is continued by closing the control valve and stopping the operation. (7) In the raw material passing operation process, the control valves for supplying raw materials, discharging selected raw materials, and circulating the entire amount of waste liquid containing disintegrated fibers to the raw material supply path are opened, and other supply and discharge operations are controlled. 6. The method according to claim 5, wherein the continuous operation is performed with the valve closed and paused.