JPH07102493A - Method for dry process disintegration of waste paper and device therefor - Google Patents

Abstract

PURPOSE:To provide a method for the dry process fiber-disintegration of waste paper, capable of disintegrating the waste paper into long pulp fibers without breaking the pulp fibers, and to provide a device therefor. CONSTITUTION:A wall surface having a wave-shaped cross section is disposed on the inner surface of a gas passage R, and a gas having a speed component in the direction parallel to the wall surface and a speed component in the vertical direction colliding with the wall surface is allowed to pass through the gas passage R. Finely cut waste paper M of raw material is allowed to pass through the gas passage together with the gas flow. The speed component of the gas flow in the parallel direction is controlled at a speed of >=40m/sec. The waste paper of raw material is preliminarily cut, and a distance L0 between the outer peripheral tip of the blade plate of a radial rotation blade 20 and the tooth tip of the inner peripheral surface grooves of a casing main body is controlled to be >=10 times of the thickness of the waste paper. The radio L0/W of the distance L0 to the width W of the blade plate 22 in the rotation shaft direction is controlled to <=0.3. The peripheral speed of the radial rotation blade 20 is controlled to >=40m/sec.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry defibrating method for waste paper and a device for defibrating the waste paper into fluffy pulp fibers.

[0002]

2. Description of the Related Art Conventionally, as a dry defibrating device for used paper, those shown in FIGS. 13 to 15 have been proposed. This conventional example waste paper disintegration apparatus has a circular casing body 1 having an inflow port 11 and an outflow port 12 each opening in a tangential direction.
A radial rotary blade 20 for sucking an airflow from the inflow port 11 and exhausting the airflow from the outflow port 12 is housed in the inner peripheral surface of the circular casing main body 10, and a large number of grooves parallel to the axis of the radial rotary blade 20 are provided on the inner peripheral surface of the circular casing body 10. 14, 14, 14 ... Are provided.

The above-mentioned conventional dry paper defibrating apparatus uses the airflow generated by the radial rotor blades 20.
The raw material waste paper M is sucked together with the airflow from the inflow port 11, and the sucked raw material waste paper M is caught in the groove 14 as shown in FIG. 14 by the swirling flow generated by the radial rotor 20 and the raw material waste paper M is absorbed. The part of the waste paper M that has been projected from the groove 14 of the groove 14 is tapped by the radial rotary blades 20, and one end of the raw waste paper M is groove 14
The raw waste paper M is torn by being hit by a radial rotary blade 20 which is locked to the other end and moves at a high speed at the other end so as to be disentangled.

Incidentally, various explanations have been made on the above-mentioned conventional defibration principle. In addition to the defibration principle, fibrillation is considered to be defibration by ultrasonic vibration due to passage of a high-speed air stream in a groove portion,
It is described that the raw material waste paper M collides with the wall surface or rolls on the wall surface to be defibrated. However, as a result of observation by ultra-high-speed imaging, as shown in FIG. 15, the used paper raw material M is the tip of the tips of the grooves 14 and the radial rotor blades 2.
A phenomenon in which a large number of them are sandwiched between the blades 22 and the tip of the blade plate 22 of 0, and defibrated so as to simultaneously shear or crush them (hereinafter, the raw material waste paper M is crushed or crushed to be crushed, And mechanical defibration including the above-mentioned rupture of the raw material waste paper M to defibrate) was most frequently observed.

[0005]

However, in the above-mentioned conventional dry defibrating apparatus for waste paper, about 30 to 50% by weight or more of powder is mixed in the disintegrated waste paper fibers, and most of them are waste paper. However, it had a problem that the defibration efficiency (yield) was low because the fibers were separated.

[0006] Further, pulp fibers of waste paper mixed with a large amount of powders of which the fibers have been cut off become a hindrance to the subsequent reuse thereof. For example, when used as a raw material for recycled paper, the paper strength is greatly reduced. It is known to have the problem of being a cause. Therefore, it is sufficient to separate and remove this powder after defibration, but defibrated waste paper has pulp fibers intricately entangled in a fluffy manner, and powder is entangled in this entangled pulp fiber. Since it is captured, it has a problem that it cannot be easily separated and removed.

In order to solve the above problems, the present inventors set the conditions in which the used paper fibers are less likely to be separated in the conventional apparatus, such as the number of revolutions of the radial rotary blades 20, the size and shape of the used waste paper M, and the amount of supply thereof. , The air flow velocity (air amount) for air transportation, the cross-sectional shape of the groove 14, the clearance amount between the tooth tip of the groove 14 and the outer peripheral tip of the radial rotary blade 20, and the like were observed and pursued under certain conditions. Below, the raw waste paper hardly contacts the radial rotary blades 20, that is, the raw waste paper is not mechanically disentangled by shearing or crushing the raw waste paper M, but the raw waste paper is caused by the radial rotary blades 20. While being pneumatically transported by the generated airflow, it becomes a state with a predetermined rigidity like a piece of wood, and when it collides with a fixed part, the collision parts are gradually beaten,
It has been found that there is a high probability that there is a high probability that the whole will be defibrated almost instantly (hereinafter referred to as mechanical beating).

That is, when the used waste paper M disentangled without coming into contact with the radial rotary blades 20 is pneumatically transported (air transferred) by the air flow, the inclined surface 14a of the crest 14b of the corrugated cross section where the grooves 14 are continuous. (The illustrated example has a sawtooth-shaped cross section, but it may have a rectangular wave shape, in which case the slope becomes a vertical surface.) The fibers of the waste paper had a longer average fiber length than those mechanically defibrated by the radial rotary blades 20, and the generation of powder was significantly less.

From the above test results, therefore, in order to reduce the influence of the radial rotary blade 20 as much as possible, the clearance between the tooth tip of the groove 14 and the outer peripheral tip of the radial rotary blade 20 is 1 mm.
When expanded to the above, although it was not possible to defibrate under the conventional operating conditions, it was confirmed that the mixture of powder was significantly reduced, and it was confirmed that many defibrated fibers were long. It was That is, since the conventional apparatus mechanically defibrates the used waste paper M, it has been found that there is a problem that many fibers of the used waste paper M are inevitably finely divided into powder.

Therefore, the present invention has been made to solve the above problems, and suppresses the mechanical defibration of raw waste paper and increases the probability of pneumatic beating so that the pulp fibers of the waste paper are not divided as much as possible. An object of the present invention is to provide a dry defibration method and device for waste paper that can be defibrated into long fibers.

Further, another object of the present invention is that when unwounded waste paper is mixed in the product when used paper is beaten pneumatically instead of mechanically unwounded, unwounded waste paper is It is an object to provide a dry defibration method and apparatus for waste paper that does not mix as much as possible.

[0012]

In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned object, solves the above-mentioned problems.
In the gas flow path R, an air flow having a velocity component in the direction parallel to the wall surface 1 and a velocity component in the vertical direction colliding with the wall face 1 is passed through, and the raw material waste paper M finely cut is described above. The technical means is characterized in that the gas flow path R is caused to flow along with the air flow.

In the present invention, in order to further improve the defibration efficiency, a wall surface 1 having a corrugated cross section is provided on the inner surface of the gas flow path R, and a velocity of 40 m / sec or more in the direction parallel to the wall surface 1 is provided in the gas flow path R. An air flow having a component and a slight velocity component in the vertical direction that collides with the wall surface 1 is passed through, and the raw waste paper M finely cut into a rectangular shape is sent along with the air flow to flow in the gas flow path R. It is a technical measure that is characterized in that it has been made to pass.

Further, according to the present invention, as a device for realizing the above-mentioned defibration method, the radial rotor 20 is housed in a circular casing body 10 having an inlet 11 and an outlet 12, and the circular casing body 10 is provided. In the used dry paper defibration device in which grooves 14, 14, 14, ... In the direction parallel to the axis of the radial rotor 20 are provided on the inner peripheral surface of the radial rotor 2
The distance L0 between the outer peripheral tip of the vane 22 and the tip of the tooth tip of the inner peripheral groove 14 of the casing body 10 is set to be 10 times or more the thickness of the raw waste paper M, and this distance L0 and the blade 22 The technical means is characterized in that the ratio L0 / W with respect to the width W in the rotation axis direction is set to 0.3 or less and the peripheral speed of the radial rotary blade 20 is set to 40 m / sec or more.

Furthermore, the present invention is an apparatus for efficiently realizing the above-mentioned defibration method, wherein a radial rotary blade 20 is provided in a circular casing body 10 having an inlet 11 and an outlet 12.
, And the grooves 14, 14, 14, ... In the direction parallel to the axis of the radial rotor 20 are formed on the inner peripheral surface of the circular casing body 10.
In the used dry paper defibrating apparatus, the drive motor 30 is fixed to one end surface of the circular casing body 10, and the drive shaft 31 of the drive motor 30 is provided in the circular casing body 10 as a central axis thereof. The drive shaft 31 inserted into the circular casing main body 10 after being matched and inserted,
A radial rotary blade 20 composed of a disk 21 and blade plates 22, 22, 22, ... Standing radially on the surface opposite to the drive motor 30 of the disk 21 is fixed, and the inlet 11 is a circular casing. The main body 10 has an opening at the center of the other end surface, and the outlet 12 is formed on the peripheral surface of the circular casing main body 10 by the disk 21.
Is opened in a tangential direction at a portion closer to the drive motor 30 side, the outer peripheral end of the disk 21 and the outer peripheral tip of the blade 22 of the radial rotor 20, and the inner peripheral groove 14 of the casing body 10.
The distance L0 from the tip of the tooth tip to 10 times or more the thickness of the used waste paper M, and the ratio L0 / W between this distance L0 and the width W of the blade 22 in the rotation axis direction to 0.3 or less. The present invention is based on the technical means characterized in that the peripheral speed of the radial rotor 20 is set to 40 m / sec or more.

Further, according to the present invention, since a large amount of waste paper locally concentrates and may not flow into the circular casing main body 10 without being defibrated, it is provided as a device for preventing this, as an inlet 11 and an outlet. Radial rotary blades 20 are housed in a circular casing body 10 having a groove 12, and grooves 14, 14, 14, ... In the direction parallel to the axis of the radial rotary blades 20 are provided on the inner peripheral surface of the circular casing body 10. In the dry defibrating device for waste paper, the drive motor 30 is fixed to one end surface of the circular casing body 10, and the drive shaft 31 of the drive motor 30 is aligned with the central axis of the circular casing body 10. Then, the drive shaft 31 inserted into the circular casing main body 10 has a disk 21, and blades 22, 22, which are erected vertically on the surface of the disk 21 opposite to the drive motor 30.
.. and 22 are fixed, the inlet 11 is opened at the center of the other end surface of the circular casing body 10, and the outlet 12 is the peripheral surface of the circular casing body 10. The disk 21 is tangentially opened at a portion closer to the drive motor 30 than the disk 21, and the outer peripheral end of the disk 21 and the outer peripheral tip of the blade 22 of the radial rotor 20 and the teeth of the inner peripheral surface groove 14 of the casing body 10 are formed. The distance L0 to the tip is
The thickness is not less than 10 times the thickness of the used waste paper M, and this distance L0 and the total width W1 + W2 + W3 ...
The ratio L0 / W1 + W2 + W3 ... Is set to 0.3 or less, and the peripheral speed of the radial rotor 20 is set to 40 m / sec or more.

Further, a radial rotary blade 20 is housed in a circular casing body 10 having an inlet 11 and an outlet 12, and the inner peripheral surface of the circular casing body 10 is parallel to the axis of the radial rotor 20. In the dry defibrating device for waste paper provided with the grooves 14, 14, 14, ... in the direction, the circular casing body 10 has its inner diameter reduced to a large diameter on one end face side and a stepwise reduction on the other end face side in the middle. Diameter, above circular casing body 1
The drive motor 30 is fixed to one end surface of 0, and the drive shaft 31 of the drive motor 30 is inserted into the circular casing body 10 so as to match the central axis thereof, and the drive inserted into the circular casing body 10 is driven. On the shaft 31, a plurality of radial rotary blades 20 composed of a disk 21 and blades 22, 22, 22 ... Standing radially on the surface opposite to the drive motor 30 of the disk 21 are fixed, The inflow port 11 is opened at the center of the other end surface of the circular casing body 10, and the outflow port 12 is opened tangentially on the peripheral surface of the circular casing body 10 at a position closer to the drive motor 30 side than the disc 21. The small diameter side distance L01 between the outer peripheral end of the disk 21 and the outer peripheral tip of the vane 22 of the radial rotary blade 20 and the tip of the tooth tip of the small diameter side inner peripheral surface groove 14 of the casing body 10 is defined as 1 of the thickness of the used waste paper M.
0 times or more, and the large diameter side distance L02 between the outer peripheral tip of the blade 22 of the radial rotary blade 20 and the top of the large diameter side inner peripheral surface groove 14 of the casing body 10 is set larger than the small diameter side distance L01. Then, the ratio L0 / W between this small diameter side distance L01 and the width W in the rotation axis direction corresponding to the small diameter side portion of the blade 22 is 0.
3 or less, and the peripheral speed of the radial rotor 20 is set to 40 per second.
It is a technical measure that is characterized in that it is m or more.

[0018]

Next, the operation of the present invention will be described. First, the raw material waste paper M that has been sent into the gas flow path R along with the air flow is pneumatically transported in the gas flow path R by the velocity component of the air flow in the direction parallel to the gas flow path R. Then, in the course of this pneumatic transportation, the raw material waste paper M is pressed against the wall surface 1 having a corrugated cross section by the velocity component in the vertical direction, and collides against the inclined surface 14a of the wall surface 1 having a corrugated cross section one after another (this solution). The fiber has a function of being beaten against the conventional mechanical defibration.

Originally, waste paper is a flexible material that can be easily bent. As described above, even if the soft material is strongly collided with the wall surface 1 having the corrugated cross-section, the collapsing portion of the used raw paper is bent and the impact force is absorbed. However, the raw material waste paper made of this soft material also has a property of extremely high rigidity during pneumatic transportation when pneumatically transported at a constant speed or higher. That is, since the used waste paper during pneumatic transportation can be regarded not as a soft material but as a material having a large rigidity, when it collides with the inclined surface 14a of the wall surface 1 as shown in FIG. The force is transmitted to the entire raw material paper M, and this impact force connects the fibers of the waste paper to each other. The bonding force (the waste paper is made by adhering pulp fibers to each other with a filler such as a paste material. Is called "bonding force" in this application), the fibers are defibrated as shown in the middle to lower stages of "Fig. 4" (from the actual observation result observed by the ultra-high-speed imaging device, "Fig. 4"). In the middle stage, the raw material waste paper M has a tendency that the upper part of the ridge 14b of the wall surface 1 having a corrugated cross-section does not directly collide with the upper part of the ridge 14b, and the upper part of the ridge 14b simultaneously disintegrates. Will be

However, in order to effectively obtain the above action, the wall material 1 having a corrugated cross section in the state where the used waste paper M is as shown in FIG.
The wood end face must collide with the inclined surface 14a of the mountain portion 14b, and at that time, the raw material waste paper M must have great rigidity. That is, the mountain portion 1 of the wall surface 1
If the raw waste paper M collides with the inclined surface 14a of 4b in a surface contact state, the impact force will be dispersed over a wide collision surface. Therefore, if the wood end faces of the used waste paper M collide with each other, the impact force is concentrated and the defibration efficiency is improved. Therefore, the raw material waste paper M
If the material is preliminarily cut into pieces (for convenience of cutting, it may be cut into a square or a rectangle, but may be cut into an irregular shape). The raw waste paper M has a function of keeping the wood end face of the waste paper M parallel to the air flow direction.

Further, in order to give the raw material waste paper M a large rigidity, it is necessary to set the air transport speed to a certain level or more, and by increasing the air transport rate, the raw material waste paper M
It is possible to obtain a large impact force when colliding with the inclined surface 14a of the mountain portion 14b of the wall surface 1. Then, when various experiments were conducted, it was found that the mechanical pulp waste paper with a relatively small bonding force had a speed of 40 m / sec (preferably 50 m / sec or more).
It has been found that efficient chemical disintegration can be obtained by chemically transporting waste chemical pulp having a relatively high bonding force at a speed of 60 m / sec or more (preferably 80 m / sec or more). It should be noted that the greater the velocity component in the direction parallel to the gas flow passage R of the air flow, which is the velocity of the air transport, was, the more effective it was. However, when the velocity per second exceeds 120 m, turbulent flow of the air flow is remarkably induced in the gas flow passage. As a result, the pressure loss becomes large, and a power source for airflow generation requires a large amount of energy consumption that is beyond practical use.

Further, the device of the present invention is intended to obtain the above-mentioned operation most efficiently by utilizing the conventional device, and the outer peripheral tip of the blade plate 22 of the radial rotary blade 20 and the inner peripheral surface groove of the casing body 10 are made. The distance L0 from the tip of the tooth tip 14 is set to 10 times or more the thickness of the used waste paper M, and this distance L0 and the blade 2
By setting the ratio L0 / W with respect to the width W in the rotation axis direction of 2 to 0.3 or less, the raw material waste paper M engages with both the grooves 14 of the wall surface 1 and the radial rotary blades 20 and tears, It was confirmed as a result of an experiment that the mechanical defibration in which the raw waste paper M is crushed is almost avoided. Since the used waste paper 10 may also be sandwiched between the disk 21 and the groove 14 of the wall surface 1, the spacing is set to 10 times or more the thickness of the used waste paper M to avoid mechanical disentanglement. It has an effect.

By setting the ratio L0 / W between the distance L0 and the width W of the blade 22 in the rotation axis direction to 0.3 or less, the existence of the raw material waste paper M flowing through the casing body 10 without being defibrated. It has the effect of almost eliminating. If the distance L0 is small (in the illustrated example, this distance L0 uses the same reference numeral because the outer peripheral end of the disk 21 and the tip of the blade 22 match, but the tip of the blade 22 is larger than the disk 21. When projecting in the centrifugal direction, the distance L0 mainly affects the distance between the outer peripheral end of the disk 21 and the tip of the tooth tip of the surface groove 14, so here, the outer peripheral end of the disk 21 and the tooth tip of the surface groove 14 are affected. It means the distance from the tip.) The number of collisions of the raw waste paper M with the groove 14 increases, the residence time becomes longer, and the raw waste paper M having a large distance L0.
May collide with the groove 14 less frequently, and may move to the downstream side without even colliding. Further, since the retention time of the used waste paper is related to the width W of the blade 22 in the rotation axis direction,
As a result of various tests conducted by changing the relationship between the two, it was confirmed that satisfactorily defibration could be performed with the above ratio.

Further, in the device of the present invention, the drive shaft 31 is composed of a disk 21 and blades 22, 22, 22, ... Standing radially on the surface of the disk 21 opposite to the drive motor 30. Since the radial rotary blades 20 are fixed, the inlet 11
The waste paper M flowing in the axial direction of the drive shaft 31 (indicated by the arrow P1 in FIG. 2) collides with the disk 21 to change its moving direction, and along the blades 22, 22, 22 ... It moves in the centrifugal direction (indicated by arrows P2 and P2a in "FIG. 2"),
The airflow generated by the rotation of the radial rotary blades 20 rides along the inner peripheral surface of the circular casing main body 10, rotates, and sequentially collides with the inclined surface 14a of the mountain portion 14b of the wall surface 1 to be defibrated. That is, the disk 21 changes the traveling direction of the used waste paper M, and at the same time, the air flow is changed from the inflow port 11 to the outflow port 12.
Short circuit between them to prevent them from flowing, and the air flow and the used waste paper M
And () have the effect of rotating along the inner peripheral surface of the circular casing body 10 toward the outlet 12 (the effect of allowing the used raw paper M to stay for a certain period of time).

In particular, in order to increase the impact force when the raw material waste paper M collides with the inclined surface 14a of the mountain portion 14b of the wall surface 1 by increasing the air transportation speed, the rotation of the radial rotor 20 in the apparatus of the present invention is increased. Just increase the speed. However, even if the rotational speed of the radial rotary blades 20 is simply increased, the airflow speed can be easily made constant, but the transport speed of the raw waste paper M transported by this airstream is zero when the moving speed of the raw waste paper M is zero. Since it starts from a relatively long approach distance to reach the prescribed speed, this approach distance can be secured with a large device, but it is difficult to secure this approach distance with a device of practical size. become. Further, when the rotational speed of the radial rotary blades 20 is increased, the amount of air blown is correspondingly increased, and the speed of the air flowing through the circular casing body 10 is increased. It may not be possible to guarantee a reliable collision between the used waste paper M and the inclined surface 14a after passing through. Therefore, the present invention is
By providing the disk 21 and providing the outflow port 2 on the back side thereof, the amount of air blown is suppressed even if the rotation of the radial rotary blades 20 is accelerated, and the raw material waste paper M rotates within the circular casing body 10 many times. Ensuring a sufficient residence time to increase the probability of collision,
Even a small-sized device has a function of ensuring a reliable collision with the inclined surface 14a.

Of the waste paper M whose moving direction is changed by the disk 21 of the radial rotary blade 20, the raw waste paper M which passes through the disk 21 side as shown by the arrow P2a in FIG.
Since it is fed from the beginning to the downstream side of the groove 14 (the left end of "FIG. 2"), there is little chance of rotating along the inner peripheral surface of the circular casing body 10 and colliding with the groove 14, and in a short time. Since it moves to the back side of the disk 21, it can be observed even when it flows through the casing body 10 without being defibrated. Therefore, in the present invention, by mounting the radial rotary blades 20 on a plurality of drive shafts 31, the raw waste paper that has moved from the first-stage radial rotary blades 20 to the back side of the disk 21 has the opportunity to collide with the groove 14 again. It acts to prevent the defibration from flowing through. In addition, when a large amount of the used waste paper is locally concentrated and supplied at one time, the disk 21 acts as a baffle so that the used waste paper M is evenly dispersed on the moving front end side. is there.

Further, the present invention provides a circular casing body 10
Has an inner diameter that is large on one end surface side and has a stepwise reduced diameter on the other end surface side.
Also has an action to disperse the used waste paper M evenly when the paper passes.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, in the method of the present invention, a wall surface 1 having a corrugated cross section is provided on the inner surface of the gas flow path R, and a velocity component in the direction parallel to the wall face 1 and a velocity component in the vertical direction that collide with the wall surface are provided in the gas flow channel R. Let the air flow that has passed through.

The embodiment shown in FIG. 1 has a pair of parallel walls 1,1.
The gas flow path R is formed between the parallel wall surfaces 1 and 1a by a, and the parallel groove 1 is formed on the inner surface of the wall surface 1 in the lower part of the figure.
A large number of four 4 are juxtaposed, and the ridge line is in the frontward direction toward the back.
And the groove 14 are alternately continuous so as to form a corrugated cross section.

In the present embodiment, the groove 14 (mountain portion 14b) does not have an equilateral triangular cross section with a side of 3 mm, and has a sawtooth waveform when viewed from the side (see FIG. 1 from the front). However, the shapes of the groove 14 and the crest 14b may be changed to a rectangular waveform, a sine waveform, or the like.

The upper wall surface 1a (upper side in FIG. 1) has a nozzle 13 for injecting an air stream obliquely downward.
a, 13a, 13a ... Are arranged at a predetermined interval,
The airflows jetted from the nozzles 13a, 13a, 13a ... In the gas flow path R, there are velocity components parallel to the wall surface 1 (flow channel R) (velocity components moving from left to right in the figure), and the wall surfaces. 1 and a vertical velocity component (a velocity component directed downward in the figure) that collides with the No. 1 flow-through from the left side to the right side in the figure. In FIG. 1, the right and left dimensions of the wall surfaces 1 and 1a are shown to be short, but in actuality, the length may be set to a considerable length (3 m as an example).

Further, although the groove 14 is continuously provided on the lower wall surface 1 in the illustrated embodiment, a predetermined number of grooves 14, 1 are provided.
After arranging 4, 14, ... Side by side, a predetermined number of grooves 14, 14, 14, ... Are further arranged side by side, and a lower wall surface 1 is provided between the grooves 14 group. May be a flat surface, and in this case, the flat surface portion of the wall surface 1 may serve as a run-up portion for the raw material waste paper M to have a sufficient speed in preparation for the next collision.

Further, in the embodiment shown in FIG. 1, the airflow is jetted only from the nozzles 13a, 13a, 13a ..., However, the nozzles 13a, 13a, 13a.
In some cases, a large power may be required to set a large parallel velocity component in the injection by only the injection. Therefore, in addition to the injection from the nozzles 13a, 13a, 13a ... The air flow may be sent by pressure or the air flow may be sucked by a negative pressure from the right side of the drawing.

Then, in the present invention, the finely cut raw material waste paper M is sent along with the above air flow to flow through the gas flow path (R).

As the used waste paper M finely cut, recovered waste paper cut by a conventionally known cutting machine may be used. For example, in the example of FIG. 11, the used waste paper M sent by the conveyor 51 is a slitter device. A strip 52 is cut into strips, and then the strip-shaped waste paper is cut into a square by a drum cutter device 53 or the like. In addition,
The raw waste paper M may be cut into irregular shapes as described above, but in the present embodiment, the size of 2 × 6 mm or 3 × 12 mm (the difference in the defibration efficiency due to the dimensional difference of the raw waste paper M) is used. Was almost impossible to check.)

Then, the raw waste paper M finely cut
In order to make the air flow along with the air flow,
A conventionally known pneumatic transportation system can be applied, and in the example of FIG. 11, the raw material waste paper M cut by the drum cutter device 53 is guided to the hopper 55 by the conveyor 54, and the feeder 56 connecting the hopper 55 and the gas flow path R. (Although a screw feeder is used in the illustrated example, other methods such as a rotary feeder may be used, but it is desirable that the raw material waste paper M has a gas flow path R as much as possible.) (One end is open to the atmosphere as an opening R1.)
The fed used waste paper M rides on the air flow passing through the gas flow path R and is sequentially pneumatically transported to the downstream side (outlet 12 side).

The raw material waste paper M which is pneumatically transported in the gas flow path R is pressed against the wall surface 1 having a corrugated cross section by the velocity component in the vertical direction (centrifugal direction) during the pneumatic transport. One after another collides with the inclined surface 14a of the wall surface 1 having a corrugated cross section to be defibrated. In this defibration, the force applied to the raw waste paper M is only the impact force when it collides with the inclined surface 14a of the wall surface 1, and mechanical defibration force such as tearing the waste paper from both sides is not applied. Results in effectively reducing the probability that the will be fragmented.

However, if the impact force is not more than a predetermined value, the raw waste paper will not be defibrated. The impact force can be increased by increasing the airflow velocity. As specified in the invention of claim 2, the airflow velocity is set to 40 m / sec or more, and a substantially satisfactory defibration result is obtained. In addition,
From mechanical pulp waste paper of about 40 m / sec to chemical pulp waste paper of relatively high paper strength, about 50 m / sec of effective defibration was possible.

Then, as described above, when the raw material waste paper M cut into a rectangular shape is pneumatically transported at a speed of 40 m / sec or more, the raw material waste paper M has, as shown in FIG. The raw paper waste M that collides with the slope 14a of the portion 14b is restrained by the high-speed air flow to suppress the bending force of the raw waste paper M, and exhibits extremely great rigidity, so that the impact force due to the collision is ensured on all the fibers constituting the waste paper raw material M. The raw material waste paper M is disintegrated into pulp fibers against the bonding force of the fibers.

Next, as the device of the present invention, the gas flow path R
It is also possible to use a circular shape instead of a straight line. As a device of this kind, the radial rotor 20 is housed in a circular casing 10 having an inlet 12 and an outlet 12, and the inside of the circular casing 10 is A conventional device having grooves 14, 14, 14, ... In the direction parallel to the axis of the radial rotor 20 can be applied to the peripheral surface.

However, since the above-mentioned conventional apparatus mechanically disintegrates the raw material waste paper M as described above, in the apparatus of the present invention, the circular casing body 10 having the inflow port 11 and the outflow port 12 is In the dry defibrating device for waste paper, which accommodates the radial rotary blades 20 and is provided with grooves 14, 14, 14, ... In the direction parallel to the axis of the radial rotary blades 20 on the inner peripheral surface of the circular casing body 10, Blade 22 of radial rotor 20
A distance L0 between the outer peripheral tip of the circular casing body 10 and the tip of the tooth tip of the inner peripheral surface groove 14 of the casing body 10 is set to be 10 times or more the thickness of the raw waste paper M, and the gas flow passage R is formed in the vicinity of the inner peripheral surface of the circular casing body 10. It has been done.

Therefore, in the embodiments shown in FIGS. 2 to 3, the radial rotor 20 causes the velocity component in the direction parallel to the circular casing body 10 corresponding to the wall surface 1 (actually in the circumferential direction). The wall surface 1 (circular casing body 1
0), which has a vertical (actually centrifugal) velocity component that collides with 0).
The velocity component from 1 toward the outlet 12 (the velocity component in the leftward direction in FIG. 2) is also added.

As the circular casing main body 10, the radial rotary blades 20 and the grooves 14, those conventionally known as shown in FIGS. 13 and 14 may be used, but in this embodiment, they are convenient for manufacturing. Therefore, the circular casing main body 10 is configured by dividing the internal gear-shaped main member 10a, the lid member 10b, and the blower casing member 10c into three parts.
0a is sandwiched between the lid member 10b and the blower casing member 10c, and these three members are fastened and fixed by the fixing screws 15, 15, 15.

The distance L0 between the outer peripheral tip of the blade 22 of the radial rotary blade 20 and the tip of the tooth tip of the inner peripheral surface groove 14 of the casing body 10 is set to be 10 times or more the thickness of the used waste paper M. This is for avoiding shearing and crushing of the used waste paper M of the conventional apparatus. In addition, this distance L0 is 10
When set to double, the observation result shows that the airflow velocity is slow near the groove 14 and the used waste paper M may be trapped, but at the same time, turbulent flow is generated, so that it easily escapes from the groove 14,
Almost no phenomenon of pulling the used waste paper M mechanically by both the groove 14 and the radial rotary blade 20 and mechanical defibration was observed, and neither shearing nor crushing phenomenon was observed.

In the apparatus of the present invention, the ratio L0 / W between the distance L0 and the width W of the blade 22 in the rotation axis direction is set to 0.3 or less, and the peripheral speed of the radial rotor 20 is set to 40 m / sec or more. I am doing it.

In the above, the ratio between the distance L0 and the width W of the vane 22 in the rotation axis direction is the result of the experiment, and the distance L0
When the ratio L0 / W between the blade width and the width W of the blade 22 in the rotation axis direction is set to 0.3 or less, the raw material waste paper M can be almost prevented from flowing through without being defibrated. Further, the radial rotor 20
The peripheral speed of is set to 40 m / s or more because the velocity component in the parallel direction of the airflow is 40 m / s or more.

As in the case of "FIG. 1" and "FIG. 2", the groove 14 has a regular triangular cross section with a side of 3 mm.

Further, in the device of the present invention, the drive motor 30 is fixed to one end surface of the circular casing body 10, and the drive shaft 31 of the drive motor 30 is attached to the circular casing body 1.
The drive shaft 31 inserted in the circular casing main body 10 is inserted into the circular casing main body 10 so that the disc 21
The radial rotary blade 20 composed of blades 22, 22, 22, ... Standing radially on the surface of the disk 21 opposite to the drive motor 30 is fixed.

[FIG. 13] In the conventional apparatus, both the inflow port 11 and the outflow port 12 are provided in the tangential direction of the circular casing body 10. However, in the present invention, the inflow port 11 is at the center of the other end surface of the circular casing body 10. The outlet 12 is opened tangentially to the peripheral surface of the circular casing body 10 at a position closer to the drive motor 30 side (opposite the inlet 11) than the disk 21. And the radial rotor 20
The swirling flow generated in the circular casing body 10 thereby sequentially flows out from the outflow port 12, and the amount of air corresponding to this outflow amount sequentially flows in from the inflow port 11. That is, in this embodiment, the airflow is sucked from the axial direction of the radial rotary blade 20 and flows out in the tangential direction.

The radial rotary blades 20 are the same as those used in a conventional blower, except that the radial rotary blades 20 rotate the air flow and the used waste paper M at a high speed, but the residence time is different. The ventilation function is suppressed to make it longer. In order to suppress this air blowing function, first,
A disc 21 is used, and the disc 21 is located in the middle of the main body member 10a and the blower casing member 10c in the circular casing body 10, and the main body member 10a and the blower casing member 10c are mostly covered by the disc 21. It is designed to partition. All or most of the radial rotor blades 20 are located in the main member 10a, and the outlet 12 is tangential to the portion of the peripheral surface of the circular casing body 10 closer to the drive motor 30 than the disk 21. The swirling flow generated by the rotation of the radial rotary blades 20 by opening is mainly in the main member 10a, and a part of the swirling flow is in the disk 2
1 flows into the blower casing member 10c from a gap between the inner peripheral surface of the circular casing body 10 and then flows out from the outlet 12.

Further, the vanes 22, 22, 22 ... As shown in FIG. 7 to FIG. 9, each vane 22 has a linear radial system shown in FIG. Either the forward method shown in "Fig. 8" in which the plate 22 bends in the rotation direction P4 or the backward method shown in "Fig. 9" in which each blade 22 curves in the direction opposite to the rotation direction P4. May be used, but the relationship between the airflow velocities (when the peripheral speed of the radial rotor 20 is constant) is as follows. Velocity component in parallel direction (circumferential direction) of absolute velocity of air flow (velocity viewed from stationary system) Forward system> Radial system> Backward system ... (1) Absolute velocity of air flow (speed viewed from stationary system Composition of parallel velocity component and vertical velocity component of invention) Forward method> Radial method> Backward method ... (2)

Therefore, the residence time of the used waste paper M can be changed from the relationship (1) and the speed at which the used waste paper M collides with the groove 14 can be changed from the relationship (2). In other words, the backward method is used for the mechanical pulp waste paper having a relatively weak paper strength, and the retention time is long although the force of collision with the groove 14 is weak, and the radial method or the forward method is used for the chemical pulp waste paper having a relatively high paper strength. It is preferable that the raw material waste paper M collides with the groove 14 at a sufficient speed by employing a method. Needless to say, this adjustment can be performed by adjusting the rotation speed of the motor 30, but it is effective when the rotation speed of the motor 30 is restricted. A hollow disk 25 is attached to the upper ends (right ends of "FIG. 2") of the vanes 22, 22, 22 ... to reinforce them.

Further, in the present invention, the radial rotary blade 20 adopts the cantilever azimuth type by the drive shaft 31 of the drive motor 30. The radial rotary blade 20 has a cylindrical body 23 into which a drive shaft 31 is inserted, and although not shown in the drawing, this cylindrical body 23 can be inserted and removed by key connection, but with respect to the drive shaft 31. However, the disk 21 is fixed to the cylindrical body 23 by being connected so as not to rotate. Further, a retaining nut 24 of the radial rotary blade 20 is fastened to the tip of the drive shaft 31.

The adoption of the above-mentioned cantilever system has been impossible in the conventional apparatus from the following two points. The first point is
In the conventional device, the distance between the outer peripheral tip of the radial rotary blade 20 and the tooth tip of the groove 14 is set to be small, so that sufficient accuracy cannot be obtained in manufacturing the device. The second point is that the raw material of paper is sheared. This is because the radial rotor blades 20 are crushed and crushed, so that a large force is applied to the radial rotor blades 20 and the strength cannot be secured.

However, since the apparatus of the present invention abandons the conventional mechanical defibration and adopts the pneumatic beating, the interval between the outer peripheral tip of the radial rotary blade 20 and the tooth tip of the groove 14 can be set large, and the waste paper raw material can be set. Since the blades are not sheared or crushed, the radial rotor blades 20 do not exert an unreasonable force, and can achieve sufficient accuracy and strength by the cantilever system.

Next, the example shown in FIG. 5 is the radial rotor blade 2 described above.
A plurality of 0s are fixed. This radial rotor 20
The reason for fixing multiple sheets of paper is "Fig. 2" of the used raw paper M
The one that passes through the most disk 21 side as indicated by the arrow P2a is the groove 1
There is little opportunity to collide with 4 and the disk 21
Moves to the back side of the casing and rarely remains undisentangled casing body 1
In order to prevent this from flowing through the inside of the rotor 0, in the embodiment shown in FIG. 5, three radial rotor blades 20 are attached to the drive shaft 31. In the illustrated embodiment, the radial rotary blades 20 are attached to the drive shaft 31 by stacking separate radial rotary blades 20 for convenience of assembly and disassembly. It is needless to say that instead of mounting the plurality of radial rotor blades 20 on the drive shaft 31, a plurality of discs 21 and blade plates 22, 22, 22 ... Integrally connected therebetween may be used. Is.

Therefore, according to the present invention, by mounting a plurality of the radial rotary blades 20 on the drive shaft 31, the raw waste paper that has moved from the first-stage radial rotary blade 20 to the back side of the disk 21 is again in the groove 14. It has a chance to collide and prevent it from flowing through undisentangled.

Further, by mounting the radial rotary blades 20 in a plurality of stages, the raw material waste paper M is uniformly dispersed, and when a large amount of raw material waste paper is locally concentrated and supplied at one time,
Specifically, when the raw material waste paper M is accumulated and supplied to one place at a distance L0 or more, the disk 21 serves as a baffle, and only the amount that can pass the distance L0 is provided on the back side of the disk 21. Even if the waste paper material M is not deposited so much, some waste paper materials M located slightly on the center side of the radial rotary blade 20 cannot smoothly pass through the gap of the distance L0. As shown in FIG. 10, the material waste paper M was locally concentrated in the first stage radial rotor 20 portion on the left side of FIG. The used paper M is evenly dispersed.

The distance L0 between the outer peripheral tip of the vane 22 of the radial rotary blade 20 and the tip of the addendum of the inner peripheral groove 14 of the casing body 10 is set to be 10 times or more the thickness of the used waste paper M, and , This distance L0 and the total width W of the blade 22 in the rotation axis direction
Ratio of 1 + W2 + W3 ... L0 / W1 + W2 + W3
··· is set to 0.3 or less. That is, the width of the blade 22 in the direction of the rotation axis does not need to be changed in principle in the ratio to the distance L0 regardless of whether a single blade or a plurality of blades is used. When used, the function of uniformizing the used waste paper M of the disc 21 increases the chances of the used waste paper M colliding with the groove 14, so that even if the total width of the blade 22 in the rotation axis direction is narrower than that of a single case. It's good. .

Further, in the embodiment shown in FIG. 6, the inner diameter of the circular casing body 10 has a large diameter on one end face side, and the other end face side has a stepwise reduced diameter on the way. The reason why the casing body 10 is stepwise reduced in diameter is to prevent the same raw material waste paper M from flowing through the inside of the casing body 10 without being defibrated. Then, it becomes a resistance that the raw material waste paper M moves to the downstream side, and can contribute to the uniform dispersion of the raw material waste paper M.

Further, the small diameter side distance L01 between the outer peripheral tip of the blade 22 of the radial rotary blade 20 and the tip of the addendum of the small diameter inner peripheral surface groove 14 of the casing body 10 is 10 times or more the thickness of the raw waste paper M. And the blade 22 of the radial rotor 20
Outer peripheral tip and the inner peripheral surface groove 14 on the large diameter side of the casing body 10.
The large-diameter side distance L02 from the top of the is set larger than the small-diameter side distance L01.

The large-diameter side distance L02 between the outer peripheral tip of the blade 22 of the radial rotary blade 20 and the top of the large-diameter side inner peripheral surface groove 14 of the casing body 10 is set to be larger than the small-diameter side distance L01. This is because the main purpose of this part is to make the raw material waste paper M uniform over the entire circumference. In addition, for reliable defibration, the small diameter side distance L01 and the blade 22
L0 / W with the width W in the rotation axis direction corresponding to the small diameter side part of
Is 0.3 or less, which is the same as the other embodiments.

In the embodiment shown in FIG. 6, the fixed blade 41 is attached to the back side of the radial rotary blades 20, 20, and
A blower blade 42 is attached to the back side of the fixed blade 41.

The fixed blade 41 has a hollow portion on the center side, and the defibrated raw material waste paper M is redirected to the center side as shown by an arrow P5 in FIG. This is done so that the swirling flow does not affect the radial rotary blade 20 side (for the purpose of increasing the residence time of the used waste paper M). And the blower blade 42 is the same as a normal blower,
The rotation causes the air to be exhausted from the outlet 12 that sucks air from the direction of the rotation axis.
The defibrated raw waste paper that has moved in the five directions is the blower blade 42
Then, it moves again in the centrifugal direction and flows out from the outlet 12 together with the air flow.

The blower blade 42 is separately provided. By changing the outer diameter of the blower blade 42, the amount of blown air, in other words, the air flow passing through the casing body 10 and the residence time of the used waste paper M can be adjusted. It can be adjustable.

The radial rotor blade 20 of the above "FIG. 6",
Although 20 is an integrated body of both, a separate body may be used as in the example shown in FIG. 5, or a single blade 22 having a wide width may be used. It's good.

[0067]

INDUSTRIAL APPLICABILITY The present invention is as described above, in contrast to the conventional defibration method in which the raw material waste paper M is mechanically torn and defibrated.
Since the raw material waste paper M is disintegrated by colliding it with the fixing member by the air flow, the raw material waste paper M is defibrated by beating during air transportation, so that the fibers can be prevented from being broken into powder. A dry defibration method and an apparatus therefor can be provided.

Particularly, in the device of the present invention, the outer peripheral tip of the blade 22 of the radial rotary blade 20 and the inner peripheral surface groove 14 of the casing body 10 are
The distance L0 from the tip of the tooth tip to 10 times or more the thickness of the used waste paper M, and the ratio L0 / W between the distance L0 and the width W of the blade 22 in the rotation axis direction is 0.3 or less. By doing so, it is possible to almost avoid the phenomenon that the used raw paper M engages with both the grooves 14 of the wall surface 1 and the radial rotary blades 20 and tears, and the phenomenon that the used raw paper M is crushed, and the fibers are divided into powder. It is possible to provide a dry defibration device for used paper that can prevent the crushing.

Further, in the device of the present invention, the drive motor 30 is fixed to one end surface of the circular casing main body 10, and the drive shaft 31 of the drive motor 30 is inserted into the circular casing main body 10 so as to match its central axis. The drive shaft 31 inserted into the circular casing body 10 includes a disk 21 and blades 22, 22, 22, ... Standing radially on the surface of the disk 21 opposite to the drive motor 30. Since the radial rotary blades 20 to be configured are fixed, a so-called cantilever system can be provided, and a dry defibration device for used paper having a simple configuration can be provided.

Further, in the device of the present invention, the inflow port 11 is opened at the center of the other end face of the circular casing body 10, and the outflow port 1 is provided.
2 is a peripheral surface of the circular casing main body 10 and is tangentially opened at a portion closer to the drive motor 30 side than the disk 21. Therefore, the radial rotary blade 20 is different from the conventional blower in its blowing function. However, even if the radial rotary blade 20 is rotated at a high speed necessary for defibration, the retention time of the raw material waste paper M is secured for a long time, and the circular casing body 1
It is possible to provide a dry defibrating device for used paper that can be swung in the number 0 many times to ensure reliable collision and defibration with the slope 14a with a small device.

Furthermore, the device of the present invention is a radial rotor blade 2
Since a plurality of 0s are fixed, the opportunity to collide with the sloped surface 14a of the used waste paper M delivered to the inner side of the circular casing body 10 is surely guaranteed, and the waste paper dry type that can prevent the undisintegrated waste from being mixed It is possible to provide a defibration device.

Further, in the device of the present invention, the circular casing main body 10 has an inner diameter that is large on one end surface side and has a stepwise reduction on the other end surface side. It is possible to provide a dry defibrating device for used paper that can be efficiently disintegrated by uniformly dispersing the raw material waste paper M moving to the downstream side due to resistance, increasing the residence time.

Furthermore, the apparatus of the present invention can provide a dry defibration apparatus for waste paper in which fibers are not easily divided into fine pieces because the defibration method is different from the conventional one, and the experimental result is as shown in FIG. Met. In the graph of "Fig. 12", the abscissa represents the disentangled fiber length and the ordinate represents the quantity ratio, and the raw material waste paper M used was 3 x 12 mm.

In the graph, the broken line is "FIG. 13".
In the conventional device of "Fig. 14", the distance L0 is 0.6 mm, the rotation speed is a peripheral speed of 30 m / s (experiments at a rotation speed higher than this was impossible due to the specifications.) The solid line is the example of "Fig. Then, the distance L0 was 1 mm, the rotation speed was 60 m / s in peripheral speed, and the thin chain double-dashed line is the example in FIG. 5, and the distance L0 was 1 mm and the rotation speed was 90 m / s in peripheral speed. As a result, in the example of "Fig.
/ S can reduce the fiber of 0.6 mm or less to about 1/3 as compared with the case where the conventional device is used. Further, if the rotational speed is 90 m / s, the fiber length of 1 mm or more can be obtained. It was confirmed that defibrated fibers that account for 60% or more and can be used as they are as recycled materials can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is a partial cross-sectional side view of another apparatus example for carrying out the method of the present invention.

FIG. 3 is a front view of the “FIG. 2” apparatus example without a lid.

FIG. 4 is a front view of a main part for explaining a defibrating action.

FIG. 5 is a partial cross-sectional side view of yet another example of a device for carrying out the method of the present invention.

FIG. 6 is a side view, partly in section, of yet another example of a device for carrying out the method of the present invention.

FIG. 7 is a front view of a radial rotor used in the device of the present invention.

FIG. 8 is a front view of another radial rotor used in the device of the present invention.

FIG. 9 is a front view of still another radial rotor used in the device of the present invention.

FIG. 10 is a front view of the inner peripheral surface of the casing main body for explaining the process of uniformly dispersing raw waste paper.

FIG. 11 is a side view showing a state in which an accessory device is connected to the device of the present invention.

FIG. 12 is a comparison graph of defibration efficiency.

FIG. 13 is a vertical cross-sectional view of a main part of a conventional device.

FIG. 14 is a sectional view of an essential part for explaining the defibration principle of a conventional device.

FIG. 15 is a sectional view of relevant parts for explaining the defibration principle of the conventional device.

[Explanation of symbols]

 R Gas flow passage M Raw material waste paper L0 Distance L1 Short-side length 1 Wall surface 10 Circular casing body 11 Inlet 12 Outlet 14 Groove 20 Radial rotor blade 21 Disc 22 Blade plate 30 Drive motor 31 Drive shaft

Claims (8)

[Claims] 1. A wall surface (1) having a corrugated cross section is provided on the inner surface of the gas flow path (R), and a velocity component parallel to the wall surface (1) and a collision with the wall surface (1) are provided in the gas flow path R. A raw material waste paper (M) finely cut is caused to flow through the gas flow path (R) by passing an air flow having a vertical velocity component. A characteristic method of dry defibration of used paper. 2. A wall surface (1) having a corrugated cross section is provided on the inner surface of the gas flow channel (R), and a velocity component of 40 m / sec or more in a direction parallel to the wall surface (1) is provided in the gas flow channel (R). In the gas flow path (R), a raw material waste paper (M) cut into fine squares is passed through an air flow having a slight vertical velocity component that collides with the wall surface (1) and is accompanied by the air flow. A method for dry defibration of waste paper, characterized in that it is made to flow through. 3. Radial rotor blades (2) in a circular casing body (10) having an inlet (11) and an outlet (12).
0) is housed in the inner surface of the circular casing body (10), and the grooves (14,
In the dry defibration device for waste paper provided with 14, 14 ...), the outer peripheral tips of the vanes (22) of the radial rotary blade (20) and the teeth of the inner peripheral groove (14) of the casing body (10). The distance (L0) to the tip end is set to be 10 times or more the thickness of the raw waste paper (M), and the ratio (L0) of this distance (L0) to the width (W) of the blade (22) in the rotation axis direction. / W) is set to 0.3 or less, and the peripheral speed of the radial rotary blade (20) is set to 40 m / sec or more. 4. A radial rotor blade (2) in a circular casing body (10) having an inlet (11) and an outlet (12).
0) is housed in the inner surface of the circular casing body (10), and the grooves (14,
14, 14 ...) in a used dry paper defibrating device, a drive motor (30) is fixed to one end surface of the circular casing body (10), and a drive shaft (30) of the drive motor (30) is fixed. 31) is inserted into the circular casing main body (10) so as to match its central axis, and the drive shaft (31) inserted into the circular casing main body (10) has a disc (21) and the disc (21). 21) blades (2) that are erected radially on the surface opposite to the drive motor (30)
2, 22, 22, ...) are fixed, and the inflow port (11) is opened at the center of the other end surface of the circular casing body (10), and the outflow port (12). ) Is tangentially opened at a portion closer to the drive motor (30) than the disk (21) on the peripheral surface of the circular casing body (10), and the outer peripheral end of the disk (21) and the radial rotor blade (20). The distance (L0) between the outer peripheral tip of the vane (22) and the tip of the tooth tip of the inner peripheral groove (14) of the casing body (10) is set to 10 times or more the thickness of the raw waste paper (M). In addition, the ratio (L0 / W) of this distance (L0) to the width (W) of the vane plate (22) in the rotation axis direction is set to 0.3 or less, and the peripheral speed of the radial rotary blade (20) is set to the second speed. A dry defibration device for waste paper characterized by having a length of 40 m or more. 5. Radial rotor blades (2) in a circular casing body (10) having an inlet (11) and an outlet (12).
0) is housed in the inner surface of the circular casing body (10), and the grooves (14,
14, 14 ...) in a used dry paper defibrating device, a drive motor (30) is fixed to one end surface of the circular casing body (10), and a drive shaft (30) of the drive motor (30) is fixed. 31) is inserted into the circular casing main body (10) so as to match its central axis, and the drive shaft (31) inserted into the circular casing main body (10) has a disc (21) and the disc (21). 21) blades (2) that are erected radially on the surface opposite to the drive motor (30)
2, 22, 22 ...) and a plurality of radial rotary blades (20) are fixed, and the inlet (11) is opened at the center of the other end surface of the circular casing body (10), and the outlet is provided. Reference numeral (12) denotes a peripheral surface of the circular casing body (10), which is tangentially opened to a portion closer to the drive motor (30) than the disk (21), and the outer peripheral end of the disk (21) and the radial rotor blade. The distance (L0) between the outer peripheral tip of the blade (22) of (20) and the tip of the addendum of the inner peripheral surface groove (14) of the casing body (10) is 10 times or more the thickness of the used waste paper (M). And the distance (L0) and the total width of the blade (22) in the rotation axis direction (W1 + W2).
+ W3 ...) ratio (L0 / W1 + W2 + W3 ...
.) Is 0.3 or less, and the peripheral speed of the radial rotary blade (20) is 40 m / sec or more. 6. A radial rotor blade (2) in a circular casing body (10) having an inlet (11) and an outlet (12).
0) is housed in the inner surface of the circular casing body (10), and the grooves (14,
14, 14 ...), the circular casing body (10) has an inner diameter that is large on one end surface side and has a stepwise reduction on the other end surface side. A drive motor (30) is fixed to one end surface of the circular casing body (10), and a drive shaft (31) of the drive motor (30) is aligned with the central axis of the circular casing body (10). The drive shaft (31) inserted into the circular casing body (10) is erected radially on the surface opposite to the disk (21) and the drive motor (30) of the disk (21). Wings (2
2, 22, 22 ...) and a plurality of radial rotary blades (20) are fixed, and the inlet (11) is opened at the center of the other end surface of the circular casing body (10), and the outlet is provided. Reference numeral (12) denotes a peripheral surface of the circular casing body (10), which is tangentially opened to a portion closer to the drive motor (30) than the disk (21), and the outer peripheral end of the disk (21) and the radial rotor blade. The small diameter side distance (L0) between the outer peripheral tip of the blade (22) of (20) and the tip of the tip of the small diameter inner peripheral surface groove (14) of the casing body (10).
1) is 10 times or more the thickness of the raw waste paper (M), and the outer peripheral tip of the vane (22) of the radial rotary blade (20) and the large-diameter inner peripheral surface groove of the casing body (10) ( 14) the distance on the large diameter side (L02) from the top is the distance on the small diameter side (L0
1) is set larger than the distance (L01) on the small diameter side and the width (W) in the rotation axis direction corresponding to the small diameter side portion of the vane (22).
The ratio (L0 / W) of the radial rotary blade (20) is set to 0.3 or less, and the peripheral speed of the radial rotor (20) is set to 40 m / sec or more. 7. The waste paper according to claim 3 to claim 6, wherein the vane plate (22) is curved on the outer peripheral end side in the rotational direction (P4) of the radial rotary blade (20). Dry defibration device. 8. The "claim 3" to claim 6 wherein the vane plate (22) is curved on the outer peripheral end side in a direction opposite to the rotational direction (P4) of the radial rotor blade (20). The used dry paper defibration device.