JPH0559681A - Separation apparatus for paper-making - Google Patents

Abstract

PURPOSE:To improve the operation rate and screening capacity and to decrease the discharge of non-defibrated pieces by placing a screen, a recovery chamber and a dust-removing mechanism in a cake-treating chamber communicating with a foreign material discharging channel and a reject discharging channel. CONSTITUTION:A screen 26, a recovery chamber 28 and a dust-removing mechanism are placed in a cake-treating chamber 15 connecting a foreign material discharging channel 14 and a reject discharging channel 16. The recovery chamber is divided by the screen and a defibration stirring blade 27 rotating along the screen. The dust-removing mechanism is provided with a washing water feeding channel 29 having a control valve V6 and a cake-discharging channel 30 having a control valve V7.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a recycled pulp production process,
When disposing of waste paper or waste paper such as newspapers and magazines, disintegrate the disintegrated pieces from the papermaking raw material containing the disintegrated pieces and foreign matter (metal piece, stone, plastic piece, styrene piece, vinyl piece) The present invention relates to a papermaking separation device to be discarded outside.

[0002]

2. Description of the Related Art Generally, in papermaking equipment such as recycled pulp production processing, spoilage paper processing, waste paper processing, etc., the disintegrated fragments in the raw fiber suspension are disintegrated and stone, sand, metal fragments, resin In order to remove foreign matter such as pieces, and other dust, a screen device is used that is divided into a closed casing with a screen plate having multiple round holes or slits to partition the screen tail in combination with this screen device. A high-speed disintegrator equipped with an impeller rotating at high speed is known. (Japanese Patent Publication No. 59-32594)

[0003]

However, in this conventional treatment system, after cleaning the inside of the machine with cleaning water to recover useful fibers in the cake accumulated in the machine of the separation device, the cake is discarded outside the system. Since the operation work is performed, the raw material supply is stopped during the cleaning operation, and the separation process is not substantially performed during the cleaning process time, so continuous operation cannot be performed and the operation is a batch system. Therefore, there was a problem that the production amount was limited. The present invention is intended to eliminate these conventional drawbacks, it is possible to always operate the separation device, to increase the operating efficiency and also to increase the selective processing capacity for separating useful fibers and foreign substances, Moreover, it is an object of the present invention to provide a papermaking separation device in which the amount of undissolved fragments is small and the collection of useful fibers can be greatly improved in a remarkably inexpensive form.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a screen for separating a raw material introduced from a raw material inlet for papermaking into a useful fiber component and a foreign substance component is provided in a closed casing, and the interior of the chamber is a pretreatment chamber. An impeller, which is partitioned into a post-treatment chamber and is rotatably provided in the pre-treatment chamber in the vicinity of the screen,
A screen basket provided with a discharge passage for separated foreign matters and having a hydrofoil rotor attached to the post-treatment chamber, a selection chamber partitioned by the screen basket, and a selection raw material communicated with the discharge passage having a control valve, respectively. An apparatus having an outlet and a reject discharge port, having a lees processing chamber communicating the foreign matter discharge passage and the reject ejection passage, a screen in the lees processing chamber, and a disaggregation stirring rotating along the screen. A papermaking separation device, which is equipped with a collection chamber defined by blades and a screen, and a dust removal mechanism having a washing water supply passage and a lees discharge passage.

[0005]

[Operation] Control valve V ₁ of raw material supply passage 11 and selected raw material discharge passage 1
When the control valve V ₂ of No. ₂ is always opened with a predetermined opening degree and is operated,
The raw material supplied to the pretreatment chamber 3 in the closed casing 2 of the separator is the impeller 5 that rotates in the vicinity of the screen 1.
And the disintegrating agitation blades 8 facing it are disturbed in the pretreatment chamber 3 and flow through the useful fibers from the screen 1, and foreign substances are separated without passing through the screen 1 and are discharged from the discharge port 7 to the front. It is excluded from the processing chamber 3 and processed. That is,
The raw material sent to the pretreatment chamber 3 swirls in its rotation direction,
A large amount of foreign matter in the raw material is blown to the outer peripheral wall of the pretreatment chamber 3 by the centrifugal force generated by the vortex flow, and the control valve V ₄ of the foreign matter discharge passage 14 is intermittently opened and closed while turning the peripheral wall. On the other hand, the disaggregated fiber fraction passing through the screen 1 is separated by the screen bucket 9 in the swirling flow of the post-treatment chamber 4 together with the useful fiber, and the control valve V ₅ of the discharge passage 16 is opened and closed from the discharge port 10. The useful fiber that has been discharged and transferred to the lees processing chamber 15 and further passed through the screen bucket 9 is controlled by the control valve V of the flow path 12 from the selected raw material outlet 12 _1.
Although it is taken out of the system by the open / close control of ₂ and processed in the next step, either the timer or the load or the pressure difference between the inlet and the outlet of the raw material during the operation step of passing the raw material through the closed casing 2 Priority is given to the detection that has actuated, and the process is transferred to the reject discharge process, and in this reject discharge process
To the cleaning water supply path 2
By supplying water from 9, the useful fiber is passed through the screen 26 to the recovery chamber 28, and the remaining dregs are discharged to the outside of the system through the dreg discharge passage 30 to continuously carry out operations including fiber collection to increase the production amount and run. The cost can be remarkably reduced.

[0006]

EXAMPLE An example of the present invention will be described with reference to FIGS. 1 to 4 in which a screen tail from a round hole screen device S ₁ and a slit screen device S ₂ on a main line A of a papermaking raw material is a chest C and a pump D. Via the raw material feeding passage 11
Then, it is introduced into the closed casing 2 having the screen 1. That is, the screen 1 for separating the raw material introduced from the raw material inlet 6 communicating with the raw material supply path 11 having the control valve V ₁ into the useful fiber component and the foreign matter component of impurities is provided in the closed casing 2 and Is divided into a pre-treatment chamber 3 and a post-treatment chamber 4, and an impeller 5 rotatably provided near the screen 1 in the pre-treatment chamber 3 and a discharge passage 14 for separated foreign matter are provided. The screen basket 9 provided with the hydrofoil rotor 21 in the post-treatment chamber 4, the selection chamber 19 partitioned by the screen basket 9 and the selection passages 12 and 16 having the control valves V ₂ and V ₅ respectively communicated with each other. a raw material outlet 12 _1, the apparatus includes a reject outlet 10 has a draff processing chamber 15 that communicates with the foreign substance discharge passage 14 and the reject discharge channel 16, the該粕processing chamber 15 screen 6, the wash water supply path 29 with a control valve V ₆ and the collection chamber 28 which is defined by macerating for the stirring blades 27 and the screen 26 to rotate along the screen 26,
This is a papermaking separation device equipped with a dust removal mechanism provided with a lees discharge path 30 having a control valve V ₇ .

In this case, the pretreatment chamber 3 is provided with a disaggregation stirring blade 8 rotatably opposed to the impeller 5 and has a vertical shape partitioned above the screen 1. It can also be a horizontal type. The rotary impeller 5 is used as the disaggregation stirring blade 8.
Smaller diameter, e.g. 1/3 size, high speed, e.g. 1000-30
The post-treatment chamber may be provided with a driving mechanism, such as a motor 18, which rotates in the reverse direction at the speed of 00 rpm or is rotated in the same direction or intermittently in the reverse direction, and selectively operates only in the whole process continuous or only the end disaggregation fragment disaggregation process. 4 is provided with a cylindrical screen bucket 9, which is divided into a selected raw material recovery chamber 19 and a fine foreign matter recovery chamber 20, and an agitator foil rotor 21 which moves along the cylindrical screen bucket 9. In addition, the screen 1 installed in the closed casing 2
However, it is preferable that the screen basket 9 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.

[0008] The lees processing chamber 1 as the dust removing mechanism
The screen 26 provided in 5 uses a cylindrical screen basket, and the stirring fan 27 for disaggregation is rotatably provided in the cylindrical screen basket, and is driven by a drive motor 31 to separate and collect useful fibers. Good. Further, as a raw material for papermaking, it is tangentially supplied to the closed casing 2 to generate a swirl flow, and the supply of this raw material and the discharge of coarse foreign matter, fine foreign matter and selected raw material and the processing operation of the dust removing mechanism are performed respectively. This is performed by opening and closing the control valves V _{1 to} V _{6 provided in} the passages 11, 12, 13, 14, 16, 29, 30. The closed casing 2 is provided with an exhaust passage 17 having an air vent valve V _8. In addition to the preparation, the opening / closing operation is repeated as shown in FIG. 4 to perform the separation process. That is, the control valve V ₂ of the control valve V ₁ and selective material discharge passage 12 of the raw material supply path 11 is continuously operated to open at all times a predetermined angle. Then, the foreign matter discharge path 14,
16 control valves V ₄ and V ₅ are opened simultaneously by timer or load control, or one of them is opened to open the control valve V of the recovery passage 13.
Open ₃ and take out the lees from the room outside the system, lees processing room 1
5, the control valves V ₄ and V ₅ are closed after a predetermined time by the timer. Next, the control valve V ₆ of the wash water supply passage 29 is opened,
Rotating and driving the disaggregation stirring blade 27 while supplying a predetermined amount of water,
Further, the disaggregation of the undisaggregated pieces and the foreign matter separation are performed on the screen 26.
Do in. After that, the control valve V ₆ is closed, the control valve V ₇ of the meal discharge passage 30 is opened, and the meal is discarded from the rough processing chamber 15 repeatedly.

Also, the hydrofoil rotor 21
Is configured to be driven at a speed of, for example, 300 to 800 rpm while being controlled by the motor 24 through the rotary shaft 22 and the pulley 23 together with the rotary impeller 5 while controlling the rotation of the motor 18. in may be in the form of interlocked through the transmission or speed increasing mechanism to the clutch mechanism, and each control valve V ₁ ~V ₇ and each detector, the timer is communicated to the computer unit of the data processing unit (not shown), A control circuit is configured to control the motors that drive the rotary impeller 5 and the stirring blades 8 under the disaggregation conditions such as raw material throughput, raw material type, raw material concentration, inlet / outlet pressure difference, and load, and control valves V ₁ ... It is advisable to control the opening and closing of V ₇ so as to operate continuously.

[0010]

INDUSTRIAL APPLICABILITY According to the present invention, a device for separating and treating useful fibers and foreign matter has a lees processing chamber which communicates the foreign substance discharging passage and the reject discharging passage, and a screen and a screen along the screen. Equipped with a dust removal mechanism equipped with a rotating stirring disaggregation stirring blade and a screen, and a cleaning water supply channel and lees discharge channel, which eliminates the need to empty the separator for cleaning. The fiber content can be collected by continuous continuous operation, the production amount can be increased, the processing capacity can be improved, the foreign matter in the machine can be removed safely, and the power is effectively used without the foreign matter staying in the machine for a long time. Along with the decrease, the loss of useful fibers discarded as lees is also reduced, contributing to yield improvement, simple operation management, and disaggregating the end disaggregated fragments in the raw material, greatly increasing the recovery rate of useful fibers. Together with the foreign material The degree also improved product quality and can be adjusted, coarse foreign matter separated into precisely the course fine dust,
It has a high disintegration ability and a highly selective processing power that separates useful fibers and foreign substances, and it is possible to operate safely without causing a screen clogging phenomenon in the separation device. The operation and operation time of the disaggregation function can be adjusted depending on the amount and the property, and the separation device can perform efficient screen work.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II of FIG.

FIG. 3 is a system explanatory view of a usage state of the embodiment.

FIG. 4 is a flow sheet of processing steps of the example.

[Explanation of symbols]

1 Screen 2 Closed Casing 3 Pretreatment Chamber 4 Posttreatment Chamber 5 Impeller 6 Raw Material 7 Discharge Port 8 Disaggregation Stirrer Blade 9 Screen Basket 10 Reject Discharge Port 11 Raw Material Supply Channel 12 Discharge Channel 15 Waste Treatment Room 16 Discharge Channel 26 Screen 27 Disaggregation Stirrer blade 28 Recovery chamber 29 Wash water supply channel 30 Drainage channel V ₁ Control valve V ₂ Control valve V ₄ Control valve V ₅ Control valve V ₆ Control valve V ₇ Control valve

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Claims (3)

[Claims] 1. A screen for separating a raw material introduced from a raw material inlet for papermaking into a useful fiber portion and a foreign matter portion is provided in a closed casing, and a room is divided into a pretreatment chamber and a posttreatment chamber. A screen basket having an impeller rotatably provided close to the screen in the pretreatment chamber and a discharge passage for separated foreign matters, and a hydrofoil rotor attached to the posttreatment chamber; and the screen basket In a device equipped with a selection chamber that is partitioned by, a selection raw material outlet that is in communication with each discharge passage with a control valve, and a reject discharge port, a waste treatment chamber that connects the foreign matter discharge passage and the reject discharge passage is provided. Then, a screen was provided in the lees processing chamber, a disintegration stirring blade rotating along the screen and a collection chamber partitioned by the screen, a washing water supply passage and a lees discharge passage. Separation device for papermaking, which is equipped with a dust removal mechanism. 2. The separation device according to claim 1, wherein the pretreatment chamber is provided with a disintegrating stirring blade rotatably and is partitioned and formed above the screen. 3. The separation device according to claim 1, wherein the dust removing mechanism is provided with a cylindrical screen basket in the lees processing chamber, and rotatably provided with a stirring blade for disaggregation in the cylindrical screen basket.