JP2022115143A - Dry type defibrator for defibrating waste paper raw material and method for producing waste paper pulp - Google Patents

Abstract

To provide a dry type defibrator capable of sufficiently defibrating waste paper raw materials and excellent in energy efficiency.SOLUTION: The present invention relates to a dry type defibrator for defibrating waste paper raw materials, which has a fixed blade disk and a rotary blade disk inside a cylindrical casing. The rotary blade disk is provided in a coaxial core shape with a gap for supplying the waste paper raw material to the surface of the fixed blade disk, the fixed blade disk and the rotary blade disk have a blade groove shape for defibrating the waste paper raw material on the surfaces facing each other, and the rotary blade disk rotates around the coaxial core, and the blade groove shape of the rotary blade disk is a shape in which the defibrated waste paper pulp derived from the waste paper raw material is not discharged to the outside through the gap of the outer edge between the disks by centrifugal force generated by rotating the rotary blade disk.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method for producing waste paper pulp, in particular a method for defibrating waste paper and a dry defibrator, as well as a method and equipment for producing waste paper pulp from recovered waste paper.

Waste paper pulp can be obtained from recovered waste paper (also referred to as waste paper raw material) through processes such as compression, pulverization, distribution, defibration, and packing. Specifically, after removing foreign substances such as plastic from used paper collected from factories, stores, general households, etc., the used paper raw material is compressed into a used paper bale with high transport efficiency by a compressor such as a hydraulic cylinder. The waste paper bales are put on a conveyor and, in many cases, pulverized by a pulverizer in order to increase the efficiency of defibration. The waste paper pieces pulverized by the pulverizer are distributed and sent to a defibrator, where they are defibrated and further packed to obtain waste paper pulp.

As described in the above steps, in order to obtain waste paper pulp, waste paper is generally treated by fibrillation, in which the waste paper is loosened and fibrillated. The defibration treatment mainly includes a wet method and a dry method. The wet method is a method in which water is added to waste paper to defibrate the wet waste paper. In this method, the waste paper pulp can be made into a sheet and rolled up or piled up, which makes it easy to handle, such as transportation. Therefore, the dehydration and drying process for removing water after fibrillation requires energy, and the large amount of wastewater required to be purified has the drawback of having a high environmental impact. Furthermore, in the dehydration and drying process, since the bonds between the fibers become strong, there is also the drawback that a large amount of energy is required to disperse it in water as a raw material for paper production. On the other hand, since dry defibration does not use water, it has the advantage of being highly energy efficient and eliminating the need to consider wastewater treatment (for example, Patent Documents 1 to 5). Furthermore, the interfiber bond is not strong, and the pulp becomes a fluffy cotton-like pulp with high bulk, and the water dispersibility as a raw material is also good. Therefore, waste paper pulp production by dry fibrillation is usually advantageous when no special treatment such as deinking treatment which requires dispersion in water is required.

For the dry defibration process, a dry defibrator that defibrates waste paper raw materials (waste paper pieces) by applying physical impact without adding water is used. A dry fiber defibrator has a fixed blade and a rotating blade inside a cylindrical casing, and the cylindrical fixed blade has a blade groove on the inner peripheral surface, with a small gap between them. A rotary blade having a blade groove is provided, and waste paper pieces to be defibrated are thrown into the small gap. That is, the dry defibrator has a structure in which waste paper pieces are crushed by a fixed blade and a rotary blade facing each other by rotating the rotary blade. By rotating the rotary blade, the blade grooves of the fixed blade and the rotary blade give a physical impact to the used paper raw material, which is crushed and defibrated to obtain used paper pulp.

The blade groove shape of the fixed blade and the rotary blade of the dry type defibrator is such that the defibrated content derived from waste paper pieces is pushed out to the outer frame of the casing by the centrifugal force generated by the rotation of the rotary blade, and is naturally discharged. have. In a dry defibrator in which the blade grooves of the fixed blade and the rotary blade have such a structure, the centrifugal force is also adjusted by adjusting the speed of rotation, and the speed of discharge is appropriately adjusted, thereby defibrating. the contents can be properly removed. However, the method using the dry defibrator has a problem that a large amount of used paper pulp is discharged outside the casing system without being defibrated sufficiently. In addition, even if it is operated at a low speed in order to sufficiently grind and defibrate, it takes a lot of time and energy, resulting in poor energy efficiency. was present in a certain amount.

JP-A-6-285890 JP-A-6-293360 JP-A-11-293578 Japanese Patent Application Laid-Open No. 2000-120000 JP 2013-147772 A

In view of the problems of the prior art, it is an object of the present invention to provide a method for defibrating waste paper that can be sufficiently defibrated and is excellent in energy efficiency, and a method for producing waste paper pulp. Make it an issue. A further object of the present invention is to provide a dry defibrator for used paper pulp that can be appropriately used in the method. Another object of the present invention is to provide a method and equipment for producing waste paper pulp from waste paper raw materials, which can sufficiently defibrate waste paper raw materials with high energy efficiency and can obtain easily transportable waste paper pulp. and

TECHNICAL FIELD The present invention relates to a dry defibrator for defibrating waste paper raw materials, which has a fixed blade disk and a rotary blade disk inside a cylindrical casing,
A rotary blade disk is provided coaxially with a gap for supplying the waste paper raw material to the surface of the fixed blade disk, and the fixed blade disk and the rotary blade disk dispose of the waste paper raw material on the surfaces facing each other. It has a blade groove shape for threading, and the rotating blade disc rotates around the coaxial core,
The blade groove shape of the rotary blade disc is characterized by having a shape such that the fibrillated waste paper pulp derived from the waste paper pieces is not released to the outside from the outer edge gap between the discs due to the centrifugal force generated by the rotation of the rotary blade disc. and

The dry defibrator of the present invention preferably further has a suction device for sucking waste paper pulp extruded from the outer edge gaps between the discs, and furthermore, the blade groove shape of the rotary blade disc is equal to the disc It is preferable to have a plurality of curvilinear forms formed such that the inner sides of the curves are located in the same direction as the direction of rotation of the. Furthermore, in the dry fiber defibrator of the present invention, it is preferable that the size of the gap (clearance) between the fixed blade disk 3 and the rotary blade disk 2 is 1.5 to 6.0 mm.

The present invention relates to a method for dry defibrating waste paper raw materials using the dry defibrator of the present invention,
A step of supplying waste paper raw material from the center of the disk in the dry defibrator to the gap between the fixed blade disk and the rotary blade disk,
A step of defibrating the waste paper raw material by rotating the rotary blade disc of the dry-type defibrator around the coaxial core and causing it to remain in the gap between the fixed blade disc and the rotary blade disc;
After that, the method includes a step of sucking out the defibrated waste paper pulp that has accumulated in the gap between the fixed blade disc and the rotary blade disc and overflowed.

According to the dry-type defibrator of the present invention and the fibrillation method using the same, waste paper raw materials can be sufficiently fibrillated by remaining in the gaps between the discs for a long time, and can be fibrillated with energy efficiency. There are advantages.

The present invention has a fixed blade disk and a rotary blade disk inside a cylindrical casing,
A rotary blade disk is provided coaxially with a gap for supplying the waste paper raw material to the surface of the fixed blade disk, and the fixed blade disk and the rotary blade disk dispose of the waste paper raw material on the surfaces facing each other. It has a blade groove shape for threading, and the rotating blade disc rotates around the coaxial core,
A dry defrosting method in which the blade groove shape of the rotary blade disc has a shape in which the defiberized waste paper pulp derived from the waste paper raw material is released to the outside from the outer edge gap between the discs due to the centrifugal force generated by the rotation of the rotary blade disc. A method for dry defibrating waste paper raw materials using a fiberization machine,
A step of supplying waste paper raw material from the center of the disk in the dry defibrator to the gap between the fixed blade disk and the rotary blade disk,
By rotating the rotating blade disk of the dry-type defibrator in the opposite direction to the above around the coaxial core, the waste paper raw material is defibrated into waste paper pulp, and the waste paper pulp is retained in the gap between the fixed blade disk and the rotary blade disk. the process of causing
After that, the method is characterized by including a step of sucking out waste paper pulp that has accumulated and overflowed in the gap between the fixed blade disc and the rotary blade disc.

The dry defibration method of the present invention has the advantage that the waste paper raw material stays in the gaps between the discs for a long time so that it can be defibrated sufficiently and energy efficiently. It is advantageous in that conventionally used dry defibrators can be used as they are by reversing the direction of rotation of the rotary blade disc without requiring a large capital investment. Furthermore, by reversing the direction of rotation of the conventional dry defibrator, a machine similar to that of the dry defibrator of the present invention can be obtained.

The present invention relates to a method for producing waste paper pulp from collected waste paper,
The process of compressing the collected waste paper (waste paper raw material) to make a waste paper bale,
a step of pulverizing the waste paper bales into waste paper pieces;
It is characterized by comprising a step of defibrating by the dry defibrating machine or the dry defibrating method of the present invention to obtain waste paper pulp.
In the manufacturing method of the present invention, in the step of pulverizing the waste paper bales into waste paper pieces,
It is preferable to pulverize the waste paper veil into waste paper pieces of 20 to 80 mm square.

The present invention relates to equipment for producing waste paper pulp.
Compressor for compressing collected waste paper (waste paper raw material) into a waste paper bale,
A pulverizer that pulverizes waste paper bales into waste paper pieces,
It is characterized by including the dry defibrator of the present invention.

With the method and equipment for producing waste paper pulp from waste paper raw materials of the present invention, waste paper raw materials can be sufficiently defibrated with high energy efficiency, and waste paper pulp that can be easily transported can be obtained.

FIG. 1 is a schematic diagram of a dry defibrator of the present invention, showing a casing portion as a cross-sectional view. Arrows indicate the direction of movement of waste paper raw materials and waste paper pulp. FIG. 2 is a schematic diagram showing a rotating blade disk of the dry defibrator of the present invention, its rotating direction, and the traveling directions of waste paper pieces and waste paper pulp, which are waste paper raw materials. FIG. 3 is a schematic diagram showing a rotary blade disk of a conventional dry defibrator, its rotating direction, and the traveling directions of waste paper pieces and waste paper pulp, which are waste paper raw materials. FIG. 4 is a flow diagram showing the method and equipment for producing paper pulp from recovered waste paper of the present invention. FIG. 5 is a photograph of waste paper pulp obtained by a comparative example (FIG. 5, (a)) and an example (FIGS. 5, (b) to (d)).

A first embodiment of the present invention is a dry defibrator 1 for defibrating waste paper raw material having a fixed blade disk 3 and a rotary blade disk 2 inside a cylindrical casing 4, for example, as shown in FIG. Regarding. As shown in FIG. 1, in the cylindrical casing 4 of the dry defibrator, the cylindrical fixed blade disk 3 is coaxially formed with a small gap for supplying the waste paper raw material to the surface of the fixed blade disk 3. is provided with a rotary blade disk 2. The fixed blade disk 3 and the rotary blade disk 2 are usually installed parallel to each other, and the fixed blade disk 3 and the rotary blade disk 2 usually have similar cylindrical shapes, and have surfaces facing each other for defibrating waste paper raw materials. It has a plurality of flute shapes having constant height and thickness in a concentric and continuous manner.

The rotary blade disk 2 rotates around the coaxial core 10 . Due to the rotation, the groove shape of the fixed blade disk 3 and the rotary blade disk 2 can continuously give a physical impact to the waste paper raw material in a small gap between the fixed blade disk 3 and the rotary blade disk 2. , whereby the waste paper raw material can be defibrated without adding water. Normally, the fixed blade disc is often fixed on the opening/closing door 7 side, and the opening/closing door can be opened and closed, and the removable and replaceable rotary blade disc and fixed blade disc can be easily replaced accordingly. .

In the dry defibrator of the present invention, the blade groove shape of the rotary blade disc releases the defibrated waste paper pulp derived from the waste paper raw material to the outside through the gaps at the outer edge of the disc due to the centrifugal force generated by the rotation of the rotary blade disc. It has a shape that does not The blade groove shape of the rotary blade disc is such that waste paper pulp is accumulated inside the disc. For example, as shown in FIG. It has a shape with a plurality of curvilinear, e.g., arcuate shapes formed to be positioned. It is preferable that such a curved flute shape 21 is provided in a circular shape only at the outer peripheral edge portion (also referred to as the outer edge portion). It is preferable to provide a plurality of curved flute shapes instead of one so that there is no discontinuity on the outer edge. The blade groove shape of the outer edge preferably has the function of preventing the waste paper pulp from being discharged outside from the gaps at the outer edge of the disc and also having the function of grinding the waste paper raw material. It should be noted that the outer edge portion of the fixed blade disc may not have a blade groove shape.

On the other hand, the portion of the inner peripheral edge (also referred to as the inner edge portion) may be simply shaped to be suitable for grinding the waste paper raw material. The blade groove shape on the inner peripheral edge side of the fixed blade disk 3 and the rotary blade disk 2 has a constant height, and when the fixed blade disk 3 rotates, the fixed blade disk 3 and the rotary blade disk 2 do not overlap each other. should be arranged in a staggered manner. This is because the waste paper raw material can be efficiently impacted. The blade groove shape of the inner peripheral edge portion of the fixed blade disk 3 and the rotary blade disk 2 may be any known shape, for example, a pyramid shape such as a triangular pyramid shape, a quadrangular pyramid shape, a columnar shape, and the like. Any shape is fine. In this way, by making the inner edge side have a different blade groove shape on the outer edge side, the waste paper raw material supplied to the center part of the disk can be crushed on the inner edge side and defibrated. The waste paper pulp defibrated by the centrifugal force moves to the outer edge side.

Further, in the embodiment of the present invention, the blade groove shape of the rotary blade disk 2, preferably the blade groove shape of the outer edge of the rotary blade disk 2, has a shape such that waste paper pulp is accumulated in the gap inside the disk. there is Here, as shown in FIG. 1, the waste paper material (waste paper pieces) input from the input port 6 is pushed from the center of the disk into a small gap between the fixed blade disk 3 and the rotary blade disk 2 by the raw material pushing screw 5. (Arrow 23 in FIGS. 1 and 2), the waste paper raw material is ground and defibrated especially on the inner peripheral side by the blade groove shape of the fixed blade disk 3 and the rotary blade disk 2. Further, the fibrillated and cotton-like waste paper pulp is gradually pushed out to the outer edge of the gap between the discs according to the centrifugal force of the rotary blade disc 2, but the blade groove shape of the outer edge of the rotary blade disc 2 Because of its shape that prevents the direction of movement, it will stay there (Fig. 2). As a result, the waste paper raw material and/or the defibrated waste paper pulp are not discharged outside the system due to the centrifugal force of the rotation of the rotary blade disc 2, and remain in the small gap between the discs. continues to be supplied, the waste paper raw material and/or the defibrated waste paper pulp are sufficiently retained in the gaps between the discs, become dense there, and are further defibrated. Basically, waste paper pulp stays and defibrates until it overflows in the gap between the discs.

After this, the waste paper raw material is continuously supplied, and the cotton-like waste paper pulp overflows into the gap between the discs, thereby pushing out the waste paper pulp toward the outer edge of the disc. That is, in the present invention, instead of the centrifugal force of the rotary blade disc 2, the defibrated waste paper pulp is pushed out in the direction of the outer edge of the disc and sent out of the system simply by being filled with waste paper pulp. For example, the used paper pulp is pushed out by the pushing force of the raw material pushing screw 5 . This defibrator has the advantage that the used paper raw material stays in the gaps between the discs for a long time, so that it can be defibrated sufficiently and energy efficiently.

The defibrated waste paper pulp eventually comes out of the casing system through a small gap between the discs, is pushed out through the discharge port 8, and is discharged into the discharge path. The dry defibrator of the present invention preferably further has a suction device, such as a suction fan, for sucking such waste paper pulp extruded out of the casing system. As a result, the used paper pulp can be discharged more efficiently, and the clogging of the used paper pulp, which has become difficult to discharge naturally, can be prevented, and the processing amount can be ensured. Further, it is preferable to install a separator in the middle of the duct connecting the defibrator and the suction fan to separate the waste paper pulp and the air. Further, the waste paper pulp separated from the air is sent to the compression packing machine via the conveyor.

Furthermore, in another embodiment, the present invention relates to a method for dry defibration for defibrating waste paper stock to obtain waste paper pulp using the dry defibrator of the invention as described above.
The method includes a step of supplying waste paper raw material from the center of the disk in the dry defibrator to the gap between the fixed blade disk and the rotary blade disk;
A step of rotating the rotary blade disc of the dry-type defibrator around the coaxial core to defibrate the waste paper raw material into waste paper pulp, and causing it to stay in the gap between the fixed blade disc and the rotary blade disc;
After that, a step of sucking out the waste paper pulp that has accumulated in the gap between the fixed blade disc and the rotary blade disc, overflowed the outer edge of the gap between the discs and exited the casing system is included.

In the above, the method of using the dry defibrator according to the present invention was described, but in other embodiments of the present invention, it is conventionally used without the need for such a new dry defibrator. A conventional dry defibrator can be used as it is by changing the mode of use of the existing dry defibrator. A method for dry defibration of waste paper raw materials using a conventional dry defibrator will be described below.

A dry defibrator that can be used in the method of the present invention is a dry defibrator for defibrating waste paper raw materials having a fixed blade disk and a rotary blade disk inside a cylindrical casing, in which the rotary blade disk rotates. It has a shape such that the defiberized used paper pulp derived from the used paper raw material is released to the outside of the disc by the centrifugal force generated thereby. The blade groove shape of the rotary blade disc may be a dry defibrator having such a shape that the waste paper pulp is discharged to the outside of the disc by the centrifugal force of the rotation of the rotary blade disc. That is, in the dry fiber defibrator, a rotary blade disc is provided coaxially with a gap for supplying the waste paper raw material to the surface of the fixed blade disc, and the fixed blade disc and the rotary blade disc are respectively It has a blade groove shape for defibrating the waste paper raw material on the surface facing the , and the rotary blade disk rotates around the coaxial core. In the dry-type defibrator, the blade groove shape of the rotary blade disk has a shape such that the fiberized waste paper pulp derived from the waste paper raw material is released outside the disk by the centrifugal force generated by the rotation of the rotary blade disk. is doing. The shape of the blade grooves of the rotary blade discs may be any shape as long as the waste paper pulp is discharged to the outside from the gaps at the outer edges of the discs. For example, as shown in FIG. 3, a plurality of curved shapes 22, such as circular arc shapes, formed so that the inner side of the curve (arc) is positioned in the direction opposite to the rotating direction of the rotary blade disk 2. It has a shape with It is preferable that a plurality of such curved blade grooves are provided continuously only on the outer peripheral edge in a circular shape. The shape of the blade grooves on the outer edge grinds up the waste paper raw material and facilitates the discharge of the waste paper pulp to the outside from the gaps at the outer edge of the disc. Other blade groove shapes of the fixed blade disk and the rotary blade disk may be the same as those of the dry fiber defibrator of the present invention. In addition, the configuration of the dry defibrator may have the same configuration except for the blade groove shape of the outer edge of the rotary blade.

In such a dry defibrator, the blade grooves of the rotary blade disk have a shape such that waste paper pulp is discharged from the outer edge of the disk to the outside. That is, the waste paper raw material is supplied from the center of the disc into a small gap between the fixed blade disc and the rotary blade disc (arrow 23 in FIG. 3), and the waste paper raw material is ground by the groove shape of the fixed blade disc and the rotary blade disc. , is defibrated. Further, the defibrated waste paper pulp is gradually pushed out of the outer edge according to the centrifugal force of the rotary blade disk, and eventually comes out of the casing system from the outer edge of the disk, is pushed out to the discharge route, and is discharged ( See Figure 3). In such a dry fiberization machine and fiberization method, it is possible to continuously operate and operate without using extra energy for discharge, but on the other hand, waste paper pulp is discharged outside the casing system without being sufficiently defibrated. There was a problem that there were many In addition, even if it is operated at a low speed in order to sufficiently grind and defibrate, it takes a lot of time and energy, resulting in poor energy efficiency. There was a problem with the existence of

Therefore, in the present invention, dry fiberization is performed by rotating the rotary blade disc in the conventional dry fiberization machine in the opposite direction to the conventional method. As a result, the waste paper pieces and/or the defibrated waste paper pulp, which are used paper raw materials, are not discharged outside the system due to the centrifugal force of the rotation of the rotary blade disc, and remain in the gaps between the discs in the casing. . That is, as in the dry-type defibrator of the present invention (see FIG. 2), waste paper raw material and/or defibrated waste paper pulp are sufficiently retained in the casing. The raw material and/or defibrated waste paper pulp will stay until it overflows. After that, the waste paper raw material is continuously supplied, and the waste paper pulp overflows into the gap between the discs, thereby pushing out the waste paper pulp. That is, in the method of the present invention, as in the case of using the dry defibrator of the present invention, the defiberized waste paper pulp is disintegrated not by the centrifugal force of the rotary blade disc but simply by filling the waste paper pulp into the disc. is pushed out from the outer edge of the system and sent out of the system. This method also has the advantage that the used paper raw material stays in the gaps between the discs for a long time, and the used paper raw material can be defibrated sufficiently and efficiently.

The dry defibrator used in the present invention, like the dry defibrator of the present invention, includes a suction device, such as a suction fan, for sucking such waste paper pulp pushed out from the gaps at the outer edges of the discs. It is preferable to further have. As a result, the used paper pulp can be discharged more efficiently, and the clogging of the used paper pulp, which has become difficult to discharge naturally, can be prevented, and the processing amount can be ensured. Further, it is preferable to install a separator in the middle of the duct connecting the defibrator and the suction fan to separate the waste paper pulp and the air. Further, the waste paper pulp separated from the air is sent to the compression packing machine via the conveyor.

The dry defibrating method of the present invention has the advantage that the waste paper raw material stays in the gaps between the discs for a long time, so that it can be defibrated sufficiently and energy efficiently. It is also advantageous in that a conventional dry defibrator can be used as it is by reversing the direction of rotation of the rotary blade disc without requiring new equipment investment. Furthermore, by reversing the direction of rotation of the conventional dry defibrator, a machine similar to that of the dry defibrator of the present invention can be obtained. Further, by connecting the suction fan and the separator, there is an advantage that the used paper raw material can be defibrated more sufficiently and efficiently.

The waste paper material used in the dry defibrator and the dry defibration method of the present invention means recovered waste paper in a broad sense, but normally waste paper material may be waste paper pieces. Here, the used paper pieces are preferably those pulverized into a certain size, and more preferably, the used paper pieces obtained by compressing and pulverizing collected used paper. For example, it is preferably a piece of used paper of 20 to 80 mm square. Here, waste paper pieces of 20 to 80 mm square are squares (square, rectangle, etc.) with an average length of one side in the range of 20 to 80 mm, or paper of any shape with a similar size (area). It refers to a piece of waste paper with a thickness of . Further, it is more preferable to use similar pieces of waste paper in the range of 30 to 70 mm and 40 to 60 mm square. This is because the use of such waste paper pieces makes it possible to efficiently obtain waste paper pulp. In order to obtain such waste paper chips, it is preferable to use a waste paper bale obtained by compressing recovered waste paper and then pulverize it with a pulverizer to obtain waste paper chips.

In the dry defibrating machine and the dry defibrating method of the present invention, the amount of discharged waste paper pulp is adjusted by adjusting the size (clearance) of a slight gap between the fixed blade disk 3 and the rotary blade disk 2. Ultimately, it is possible to adjust the amount of waste paper raw material processed, the processing speed, and the degree of defibration. The clearance here is the average distance between the fixed blade disk 3 and the rotary blade disk 2 excluding the blade groove shape. Generally, the clearance should be about 1.5 to 6.0 mm, although it depends on the used paper raw material and the size of the used paper piece. If the length is less than 1.5 mm, well defibrated waste paper pulp can be obtained, but the processing speed is slow and the energy consumption for the processing increases. On the other hand, if it exceeds 6.0 mm, the processing speed is increased and the energy consumption is suppressed, but the defibration processing becomes insufficient. In the present invention, the clearance is preferably about 2.5 to 3.5 mm, so that energy consumption can be suppressed and waste paper pulp that has been defibrated quickly can be obtained. In addition, by setting the thickness to about 3.5 to 5.5 mm, it is possible to obtain practical waste paper pulp more quickly while greatly suppressing energy consumption. Further, by setting the clearance to about 1.5 to 2.5 mm, it is possible to obtain sufficiently defibrated waste paper pulp with a fine texture and high bulk.

Another embodiment of the present invention is a method for producing waste paper pulp from collected waste paper including the method of dry defibrating waste paper raw material of the present invention, and a diagram for producing waste paper pulp including a dry defibrator. 4 relates to installations such as those shown in FIG. Waste paper pulp can be obtained from collected waste paper through processes such as compression, pulverization, distribution, fibrillation, and packing. The equipment of the present invention includes a compressor for compressing the recovered waste paper raw material into waste paper bales, a pulverizer for crushing the waste paper bales into waste paper pieces, and the defibrator of the present invention described above. Any configuration including Further, in the present invention, as shown in FIG. 4, a conveyer for feeding the waste paper bales into the crusher, a crusher, a distributor, a defibrator, and a separator for separating the waste paper pulp and air are arranged in order from upstream. , and a packing machine. As these conveyors, pulverizers, distributors, separators and packing machines, generally used and well-known ones may be used.

In the method for producing waste paper pulp of the present invention, foreign substances such as plastics are removed from the waste paper raw material collected from factories, stores, general households, etc., and then the waste paper raw material is put into a waste paper bale with high transport efficiency using a hydraulic cylinder or the like. compress to In the present invention, the used paper bale is put on a conveyor and pulverized by a pulverizer in order to increase the efficiency of defibration. It is preferable that the pulverizer in the equipment of the present invention is a pulverizer capable of making waste paper pieces of 20 to 80 mm square. In the present invention, the waste paper bales may be pulverized into squares or rectangles having an average side length of 20 to 80 mm or a similar size (area) of about 20 to 80 mm square. . This is because the balance between the energy efficiency during defibration and the degree of defibration is improved. This is because if the average length of one side is less than 20 mm, more pulverization than necessary is required, resulting in poor efficiency. . It is preferable to use scraps of waste paper in the range of 30 to 70 mm and 40 to 60 mm square, preferably scraps of waste paper having side lengths in the range of 30 to 70 mm and 40 to 60 mm as the waste paper material.

The used paper pulverized by the pulverizer is distributed by a distributor and sent to the defibrator of the present invention, where it is defibrated and further packed to obtain waste paper pulp. Alternatively, a conventional dry-type defibrating machine may be used and a conventional defibrating machine may be defibrated according to the defibrating method of the present invention in which the rotary blade is rotated in the opposite direction to the setting. The defibrated waste paper pulp comes out of the casing system, is pushed out to the discharge path, and is discharged. The dry defibrator preferably further has a suction device, such as a suction fan, for sucking the waste paper pulp pushed out of the gaps between the discs. As a result, the used paper pulp can be discharged more efficiently, and the clogging of the used paper pulp, which has become difficult to discharge naturally, can be prevented, and the processing amount can be ensured. Further, it is preferable to install a separator in the middle of the duct connecting the defibrator and the suction fan to separate the waste paper pulp and the air. Further, the waste paper pulp separated from the air is sent to the compression packing machine via the conveyor. In the compression packing machine, cotton-like waste paper pulp is compression-molded into a veil and fixed by tightening with a wire. By fixing in this way, it is possible to obtain a used paper pulp bale that does not lose its shape and does not interfere with operations during transportation. As described above, with the method and equipment for producing waste paper pulp of the present invention, it is possible to sufficiently defibrate waste paper raw materials in an energy efficient manner without using excessive energy. It is possible to obtain waste paper pulp that is easy to transport.

The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is by no means limited by these examples.

In the following examples and comparative examples, collected waste paper was compressed into waste paper bales, and waste paper pieces crushed by a crusher to an average of about 50 mm square were used. -30 type, disk diameter 34 inches) and an electric motor (45 kW x 6P x 200 V) were used to perform dry defibration at a peripheral speed of 54.2 m/s (60 Hz). 889 and 890 (manufactured by Aikawa Iron Works Co., Ltd.) types were used as the blade. Of the blades, the blade at the outer edge of the rotary blade has such a shape that when the rotary blade disk is rotated forward as designed, waste paper pulp is discharged by the centrifugal force of the rotation. In addition, an absorption fan was installed through a duct, and a separator was installed to separate the waste paper pulp and the air.

<Comparative Example 1>
Using the disentanglement device with the above configuration, the clearance is 2.0 mm (the clearance here is the average distance between the rotary blade disc and the fixed blade disc excluding the groove structure), and the input amount of the raw material is The operation was carried out for one day at 24 kg/min and rotating the rotating blade disk forward as designed. The motor load was 90-130 amps (maximum 170 amps). As a result, 35 tons of waste paper pulp could be obtained per 24 hours. As shown in FIG. 5(a), the degree of disentanglement of the obtained waste paper pulp is a little rough and practical use is possible, but the energy efficiency is not excellent.

<Example 1>
Using the defibrating device having the above configuration, the clearance was set to 5.0 mm, the input amount of the raw material was set to 30 kg/min, and the rotary blade disk was rotated in the opposite direction to the designed one, and the operation was carried out for one day. The motor load was 80-130 amps (maximum 170 amps). As a result, 43 tons of waste paper pulp could be obtained per 24 hours. As shown in FIG. 5(b), the degree of defibration of the obtained waste paper pulp was the same as in Comparative Example 1, but the energy efficiency was superior to that in Comparative Example 1, and the amount that could be processed increased.

<Example 2>
Using the defibrating apparatus having the above configuration, the clearance was set to 3.0 mm, the input amount of the raw material was set to 24 kg/min, and the rotary blade disk was rotated in the opposite direction from the design, and the operation was performed for one day. The motor load was 80-140 amps (maximum 180 amps). As a result, 35 tons of cotton-like waste paper pulp could be obtained per 24 hours. . As shown in FIG. 5(c), the degree of disentanglement of the obtained waste paper pulp was better than that of Comparative Example 1 and was practically usable.

<Example 3>
Using the defibrating apparatus having the above configuration, the clearance was set to 2.0 mm, and the input amount of the raw material was set to 12 kg/min. The motor load was 140-180 amps (max 200 amps). As a result, 17 tons of fine-textured cotton-like waste paper pulp could be obtained per 24 hours. As shown in FIG. 5(d), the degree of disentanglement of the obtained waste paper pulp was very good compared to Comparative Example 1 and was practically usable.

From the above results, the dry-type defibrating machine or defibrating method of the present invention is superior in energy efficiency compared to the conventional technology (Comparative Example 1). It was found that the used paper raw material can be defibrated (Example 1). Furthermore, it was found that even with the same processing amount, a more defibrated pulp can be obtained with the same amount of energy consumption as in the conventional method (Example 2). Furthermore, it was also found that by performing defibration treatment sufficiently with a reduced processing amount, it is possible to obtain high-quality bulky waste paper pulp that has been defibrated very well (Example 3).

1 Dry fiberization machine 2 Rotary blade disk 3 Fixed blade disk 4 Casing 5 Raw material pushing screw 6 Input port 7 Open/close door 8 Discharge port 10 (Virtual) coaxial core 11 Bearing drive device 12 Electric motor 13 Runner 21 Curved blade groove shape (main invention)
22 Curved flute shape (prior art)
23 Supply direction of recovered paper raw materials

Claims (10)

A dry defibrator for defibrating waste paper raw materials having a fixed blade disk and a rotary blade disk inside a cylindrical casing,
A rotary blade disk is provided coaxially with a gap for supplying the waste paper raw material to the surface of the fixed blade disk, and the fixed blade disk and the rotary blade disk dispose of the waste paper raw material on the surfaces facing each other. It has a blade groove shape for threading, and the rotating blade disc rotates around the coaxial core,
The blade groove shape of the rotary blade disc is characterized by having a shape such that the defiberized waste paper pulp derived from the waste paper raw material is not released to the outside from the outer edge gap between the discs due to the centrifugal force generated by the rotation of the rotary blade disc. The dry defibrator. 2. The dry defibrator according to claim 1, further comprising a suction device for sucking the waste paper pulp extruded from the outer edge gap between the discs. 3. The dry defibrator according to claim 1 or 2, wherein the blade groove shape of the rotary blade disc has a plurality of curvilinear forms formed so that the inner sides of the curved lines are positioned in the same direction as the rotating direction of the disc. The dry defibrator according to any one of claims 1 to 3, wherein the size of the gap (clearance) between the fixed blade disk 3 and the rotary blade disk 2 is 1.5 to 6.0 mm. A method for dry defibrating waste paper raw materials using the dry defibrator according to any one of claims 1 to 4,
A step of supplying waste paper raw material from the center of the disk in the dry defibrator to the gap between the fixed blade disk and the rotary blade disk,
A step of defibrating the waste paper raw material by rotating the rotary blade disc of the dry-type defibrator around the coaxial core and causing it to remain in the gap between the fixed blade disc and the rotary blade disc;
After that, the method includes a step of sucking out the defibrated waste paper pulp that has accumulated and overflowed in the gap between the fixed blade disc and the rotary blade disc. It has a fixed blade disc and a rotary blade disc inside a cylindrical casing,
A rotary blade disk is provided coaxially with a gap for supplying the waste paper raw material to the surface of the fixed blade disk, and the fixed blade disk and the rotary blade disk dispose of the waste paper raw material on the surfaces facing each other. It has a blade groove shape for threading, and the rotating blade disc rotates around the coaxial core,
A dry defrosting method in which the blade groove shape of the rotary blade disc has a shape in which the defiberized waste paper pulp derived from the waste paper raw material is released to the outside from the outer edge gap between the discs due to the centrifugal force generated by the rotation of the rotary blade disc. A method for dry defibrating waste paper raw materials using a fiberization machine, comprising:
A step of supplying waste paper raw material from the center of the disk in the dry defibrator to the gap between the fixed blade disk and the rotary blade disk,
By rotating the rotating blade disc of the dry defibrator in the opposite direction to the above around the coaxial core,
A step of fibrillating waste paper raw material into waste paper pulp, and retaining the waste paper pulp in the gap between the fixed blade disc and the rotary blade disc;
After that, the method includes a step of sucking out waste paper pulp that has accumulated and overflowed in the gap between the fixed blade disc and the rotary blade disc. A method for producing waste paper pulp from collected waste paper, comprising:
A step of compressing the collected waste paper into a waste paper bale,
a step of pulverizing the waste paper bales into waste paper pieces;
The method, comprising the step of defibrating waste paper bales with the dry defibrator according to any one of claims 1 to 4 to obtain waste paper pulp. A method for producing waste paper pulp from collected waste paper, comprising:
A step of compressing the collected waste paper into a waste paper bale,
a step of pulverizing the waste paper bales into waste paper pieces;
Said method, comprising the step of defibrating waste paper bales into waste paper pulp by the method for defibrating according to claim 5. In the process of pulverizing waste paper bales into waste paper pieces,
Pulverize waste paper bales into waste paper pieces of 20 to 80 mm square,
A method for producing waste paper pulp according to claim 7 or 8. A facility for producing waste paper pulp,
a compressor for compressing collected waste paper into a waste paper bale;
A pulverizer that pulverizes waste paper bales into waste paper pieces,
Said equipment, comprising the defibrator according to claims 1-4.

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