JPH08164346A - Paper-making separator - Google Patents

Abstract

PURPOSE: To strengthen dissociation capacity to make separating treatment into useful fiber and foreign matter, and to make effective continuous operation easy. CONSTITUTION: A closed casing 2 is divided into a pretreatment chamber 3 and a posttreatment chamber 4 by a strainer 2. In the pretreatment chamber 3, an impeller 5 which is freely rotatable and a dissociation agitating blade 8 which is freely rotatably installed opposite to the impeller 5 are arranged, and also in the posttreatment chamber 4, a screen basket 9 provided with a hydrofoil rotor 21 and a careful selection chamber 19 screened off by the screen basket 9 are installed. Therefore, the dissociation agitating blade 8 is arranged on the upper surface part of the closed casing made eccentric to the impeller 5, allowing the dissociation agitating blade to be rotated in a region in which undissociated pieces tend to gather, permitting them to be effectively dissociated. Thus the dissociation capacity is sharply strengthened, and in the recovery of useful fiber content, the production is increased by normally continuous operation, and also in-equipment inspection is easy and operability is good, and operation control is simple.

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 by disintegrating the disintegrated pieces from the papermaking raw material containing the disintegrated pieces and foreign matters (metal pieces, stones, plastic pieces, styrene pieces, vinyl pieces). 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, and waste paper processing, the disintegrated fragments in the raw fiber suspension are disintegrated, and stones, 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 many 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) When performing a reject process using this screen device,
Conventionally, as shown in FIGS. 7A and 7B, a round hole screen device S ₁ and a slit screen device S ₂ are arranged in series on a main line A, and a round hole screen tail and a slit screen tail are respectively provided. Another disaggregator B, B ₁
After disintegrating with, each is processed by the round hole tail screen device S ₃ and the slit tail screen device S ₄ via the chest C, C ₁ and the pumps D, D ₁ (FIG. 7 (A)), or After the screen tails of the round hole screen device S ₁ and the slit screen device S ₂ are merged together and sent to the disintegrator B by the chest C and the pump D to be disintegrated, the round hole is passed through the chest C ₁ and the pump D _1. by treatment with a slit tail screen device S ₄ After roughing tail screen device S ₃ (FIG. 7 (B)) is performed.

[0003]

However, in this conventional processing system, the foreign matter in each screen tail is easily miniaturized by the high speed disintegrator, the processing system becomes complicated and expensive, and the round hole tail screen is used. Foreign matter on the device and slit tail screen device, that is, agitator, will cause foreign matter to operate, and many foreign matter that has returned to the screen device will cause clogging of the screen. Therefore, the pump capacity must be increased,
In the case of a single treatment using only the tail screen device, unbroken pieces were discharged as lees and the yield deteriorated, which was a problem. The present invention is intended to properly eliminate these conventional drawbacks, it is possible to increase the selective treatment capacity for separating useful fibers and foreign substances, and yet the discharge of undisassembled fragments is small, and a high-speed disintegrator is provided. As foreign matter is not crushed as much, the product quality is improved, and the operation and operation time of the disaggregation function can be adjusted depending on the amount and nature of undisaggregated pieces in the raw material, and the degree of crushing of foreign matter can be adjusted. It is an object of the present invention to provide an apparatus capable of significantly increasing recovery of useful fibers and an operating method thereof in an inexpensive form.

[0004]

According to the present invention, a strainer 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 hermetically sealed casing, and the inside of the chamber is used as 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 strainer,
A screen basket having a hydrofoil rotor attached to the post-treatment chamber, which is provided with a stirring blade for disaggregation provided rotatably facing the impeller and a discharge path for separated foreign matter, and is partitioned by the screen basket A device equipped with a selection chamber, a selection material outlet communicated with a discharge passage having a control valve, and a reject discharge outlet, wherein a disaggregation stirring blade is arranged on an upper surface of a closed casing eccentric to the impeller. A papermaking separation device characterized by the above.

[0005]

When the raw material supply passage and the selected raw material discharge passage are always opened with a predetermined opening, the raw material supplied to the pretreatment chamber 3 in the closed casing 2 of the separation device is rotated in the vicinity of the strainer 1. Is disturbed in the pretreatment chamber 3 by the impeller 5 and the disintegrating stirring blade 8 that is eccentrically opposed to the impeller 5 and flows through the strainer 1 through the useful fibers while disaggregating the undisintegrated pieces, and foreign substances are discharged from the strainer 1. It is separated without passing and is discharged from the outlet 7 to the outside of the pretreatment chamber 3 for processing. That is, the raw material fed into the pretreatment chamber 3 swirls in its rotation direction,
A vortex is given, and the coarse foreign matter in the raw material is blown to the outer peripheral wall of the pretreatment chamber 3 by the centrifugal force generated along with the vortex, and is swept along the peripheral wall to be eliminated by the intermittent opening and closing of the foreign matter discharge passage. The undisentangled fiber component that has passed through the strainer 1 is separated together with the useful fiber by the screen bucket 9 in the swirling flow of the post-treatment chamber 4, and is discharged to the outside of the post-treatment chamber 4 by opening and closing the control valve of the discharge passage 16 for processing. . Further, the useful fibers that have passed through the screen bucket 9 are continuously taken out of the system in the selected raw material flow passage 12 and processed in the next step.

[0006]

EXAMPLE An example of the present invention will be described with reference to FIGS. 1 to 5. The screen tails from the round hole screen device S ₁ and the slit screen device S ₂ on the main line A of the papermaking raw material are the chest C and the pump D. Raw material feeding passage 11
Then, it is introduced into the closed casing 2 having the strainer 1. That is, the strainer 1 for separating the raw material introduced from the raw material inlet 6 communicating with the raw material supply passage 11 having the control valve V ₁ into the useful fiber content and the foreign matter content of impurities is provided in the closed casing 2 and Is divided into a pretreatment chamber 3 and a posttreatment chamber 4, and an impeller 5 rotatably provided in the pretreatment chamber 3 close to the strainer 1 and a discharge passage 14 for separated foreign matter (primary reject). And the post-processing chamber 4
A screen basket 9 having a hydrofoil rotor 21 attached to it, a selection chamber 19 partitioned by the screen basket 9, and discharge passages 12 and 16 having control valves V ₂ and V _5.
An apparatus equipped with a selected raw material outlet 12 ₁ and a secondary reject outlet 10 which are communicated with each other, and a disintegrating stirring blade 8 on an upper surface of a closed casing eccentric to the impeller.
It is as a papermaking separation device that has been deployed.

In this case, the pretreatment chamber 3 is provided with a disaggregation stirring blade 8 rotatably facing the impeller 5, but large undisaggregated pieces are gathered outside in the closed casing 2. Therefore, a reservoir is provided at an outer position eccentric to the impeller 5, and a small-sized high-speed rotating disaggregation stirring blade 8 is provided in the reservoir, and the closed casing 2 is provided except for the mounting portion of the disaggregation stirring blade 8. An upper cover 23 is detachably provided in an opening 22 formed in the upper surface of the device so that the operability of in-machine inspection and replacement of the runner 5 and the screen basket 9 can be simplified. And the stirring blade 8 for disaggregation
As a driving mechanism which has a diameter smaller than that of the rotary impeller 5, for example, a size of 1/3 and a high speed, for example, a reverse rotation at a speed of 1000 to 3000 rpm or the same rotation or intermittent reverse rotation.
For example, the motor 18 may be provided, and the selective operation may be performed only in all the processes continuous or the end disaggregation fragment disaggregation process.
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. The closed casing 2
It is preferable that the strainer 1 installed therein has a round hole screen, and the screen basket 9 is a double separator type in which the screen basket 9 is combined as a slit screen. Further, the raw material supply passage 11 is provided with a water supply passage having a control valve V ₆ for supplying washing water.

Further, it is preferable that the discharge passage 16 is provided with a lees processing chamber (not shown) as a next step to separate and collect useful fibers. The disaggregating stirring blade 8 may be attached to the detachable upper cover 23 of the closed casing 2 at a position eccentric from the impeller 5. Further, as a raw material for papermaking, it is supplied tangentially to the closed casing 2 so as to generate a swirling flow.
Control valve V which is installed in each path 11, 12, 14, 16 for each pipe operation of discharge of fine foreign matters and selected raw materials and processing operation of dust removal mechanism
_{1 to} V ₅ is opened / closed (opened / closed by a timer or load detection or differential pressure detection), and the closed casing 2 is provided with an exhaust passage 17 having an air vent valve V ₃ .
The opening / closing operation is repeated as shown in FIG. 6 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 control valves V ₄ , V _{5 of} the foreign matter discharge paths 14, 16
Are opened simultaneously by timer or load control, or by selecting one of them to open, and either primary reject or secondary reject is continuously discharged little by little (Fig. 6A), or intermittently selected according to operating conditions and outside the system. It is also possible to incorporate the intermittent operation method (FIG. 6B) in which the control valves V ₄ and V ₅ are closed after a predetermined time by a timer after moving to the next step.

Further, 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 ₅ 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 disaggregation conditions such as raw material throughput, raw material concentration, 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 ₅ so as to operate continuously.

[0010]

Industrial Applicability According to the present invention, a strainer for separating useful fibers and foreign substances is provided in a closed casing to divide the room into a pretreatment chamber and a posttreatment chamber, and the strainer is provided in the pretreatment chamber. And a screen basket having a hydrofoil rotor attached to the post-treatment chamber, which is provided with an impeller rotatably provided in the vicinity of the above and a disaggregation stirring blade provided rotatably opposite the impeller. A device equipped with a selection room partitioned by a basket,
By deploying the disaggregation stirring blades on the upper surface of the closed casing that is eccentric with the impeller, the disaggregation stirring blades can be efficiently disaggregated by rotating the disaggregation stirring blades at a portion where undisaggregated pieces are likely to collect, thereby greatly enhancing the disaggregation ability, The useful fiber can be collected by continuous continuous operation, the production amount can be increased, the processing capacity can be improved, the foreign matter inside the machine can be safely removed, and the foreign matter does not stay in the machine for a long time. The loss of useful fiber is reduced, the yield is improved, the operation management is simple, the screen is not clogged inside the separator, and it can be operated safely. The operation and operation time of the disaggregation function can be adjusted depending on the amount and the nature of the dissociation function, and the separation device capable of efficient screen work can be obtained.

[Brief description of drawings]

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

FIG. 2 is an enlarged cutaway side view of a portion of FIG.

FIG. 3 is a plan view of the example of FIG.

FIG. 4 is a cross-sectional view taken along the line I-I of FIG.

FIG. 5 is a system explanatory view of a usage state of the embodiment.

FIG. 6 is a flow sheet of a treatment process of an example, where A is a continuous operation system and B is an intermittent operation system.

FIG. 7 is a system explanatory view of processing steps of a conventional example, in which A and B show respective usage states.

[Explanation of symbols]

1 Strainer 2 Closed casing 3 Pre-treatment chamber 4 Post-treatment chamber 5 Impeller 6 Raw material 7 Discharge port 8 Disaggregation stirring blade 9 Screen basket 10 Reject discharge port 11 Raw material supply line 12 Discharge route 16 Discharge route 20 Fine foreign matter collection chamber 21 Hydrofoil Rotor 22 Opening 23 Top cover V ₁ Control valve V ₂ Control valve V ₄ Control valve V ₅ Control valve V ₆ Control valve

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[Procedure amendment]

[Submission date] November 21, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

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

FIG. 2 is an enlarged cutaway side view of a portion of FIG.

FIG. 3 is a plan view of the example of FIG.

FIG. 4 is a cross-sectional view taken along the line I-I of FIG.

FIG. 5 is a system explanatory view of a usage state of the embodiment.

FIG. 6 is a flow sheet of a treatment process of an example, which is a continuous operation system.

FIG. 7 is a flow sheet of a treatment process of an example, which is an intermittent operation system.

FIG. 8 is a system explanatory view of processing steps of a conventional example, in which A and B show respective usage states.

[Explanation of symbols] 1 Strainer 2 Closed casing 3 Pre-treatment chamber 4 Post-treatment chamber 5 Impeller 6 Raw material 7 Discharge port 8 Disaggregation stirring blade 9 Screen basket 10 Reject discharge port 11 Raw material supply passage 12 Discharge passage 16 Discharge passage 20 Fine foreign material collection chamber 21 upper cover hydrofoil rotor 22 opening 23 V ₁ control valve V ₂ control valve V ₄ control valve V ₅ control valve V ₆ control valve

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (2)

[Claims] 1. A strainer 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 is divided into a pretreatment chamber and a posttreatment chamber. An impeller rotatably provided near the strainer in the pretreatment chamber, a disaggregation stirring blade rotatably provided facing the impeller, and a discharge path for separated foreign matter, and It is a device equipped with a screen basket with a hydrofoil rotor attached to the post-treatment chamber, a selection chamber partitioned by the screen basket, a selection raw material outlet connected to a discharge passage having a control valve, and a reject discharge outlet. And a disintegrating stirring blade is provided on the upper surface of the closed casing that is eccentric to the impeller. 2. The separation device according to claim 1, wherein the closed casing has an opening in an upper surface portion other than a mounting portion of the disaggregation stirring blade, and an upper cover is detachably provided in the opening.