JP2003181312A - Method for crushing fiber material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for crushing fiber material capable of obtaining the easily recyclable powder of the fiber material by effectively crushing the fiber material containing fibers. <P>SOLUTION: This method for crushing the fiber material containing the fibers is conducted with a roller press 1 in a roller compressing and crushing process wherein the fiber material is charged, compressed and crushed between a pair of rotating metal rollers which are energized towards each other. By conducting the roller compressing and crushing process in crushing the fiber material, the fiber material is compressed due to energizing the pair of metal rollers and meanwhile is stretched to the rolled direction due to the roller rotation and thereby the fibers of the fiber material are torn off to be fiber fragments and crushed effectively without producing cottony crushed material. The easily recyclable powder or tips of the fiber material can thus be obtained. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fibrous material pulverizing method for pulverizing a fibrous material containing fibers.
For recycling plant-based materials such as cotton, tea, rush, etc., animal-based natural materials such as silk, leather, wool, etc., waste materials of composite materials in which fiber layer and synthetic resin layer are laminated, waste materials of cotton fabric, etc. Can be used.

[0002]

BACKGROUND ART Due to recent enforcement of the Recycling Law, it is an urgent task in the manufacturing industry to manufacture easily recyclable products and to construct a recycling system. For example, in the beverage manufacturing industry, various kinds of drinks such as tea and coffee are sold, and with the rapid increase in the production amount, the residue of the tea leaves after extraction, plant fiber natural waste materials of coffee, silk, and silk. A large amount of silk fiber waste material is generated during the production of woven fabrics, and how to recycle this is a problem.

Another problem is how to recycle rush used for tatami mats as a construction waste material. Furthermore, how to recycle composite materials such as synthetic leather and tarpaulin and waste materials such as cotton fabric, which are obtained by laminating a fiber layer such as a woven fabric or a nonwoven fabric and a synthetic resin layer, is also a problem.

Therefore, in order to solve these problems, a method has been proposed in which each waste material is crushed into a fine powder, which is added to a synthetic resin for reuse. Specifically, the crushing method of the waste material is a step of coarsely crushing using a screen mill utilizing shearing force, a step of crushing the coarsely crushed one by any one of shearing force, impact force and attrition force, And a step of pulverizing the crushed material into fine powder. By finely pulverizing each waste material in this manner, the waste material can be used for various purposes, and thus there is an advantage that the recycling application can be greatly expanded.

[0005]

However, even if an attempt is made to crush a fiber-based natural waste material, a composite material composed of a fiber layer and a synthetic resin layer, a cotton fabric, etc. by such a method of crushing waste material, the fibers are crushed or collected. Since they are entangled with each other and become cotton-like, there is a problem that the pulverized product is not chip-like or powder-like and is difficult to reuse.

An object of the present invention is to provide a method for pulverizing a fibrous material which can efficiently pulverize a fibrous material containing fibers to obtain a fibrous material powder which can be easily reused.

[0007]

In order to achieve the above object, the method for crushing a fibrous material of the present invention is a method for crushing a fibrous material containing fibers, which are close to each other. A roll compression and crushing step of charging and crushing the fibrous material between a pair of metal rolls that rotate while being biased in a direction is provided. Here, as the fibrous material to be crushed, natural fiber-based materials such as cotton, tea and rush, animal-based natural materials such as silk, leather and wool, fiber layers such as woven and non-woven fabrics. Composite materials such as synthetic leather and tarpaulin, which are laminated with and synthetic resin,
It is preferable to use a cotton fabric or the like. This is because, since fibers are present in the raw material, the fibers are not easily entangled into chips or powder when pulverized by an ordinary screen mill or the like. Among these, the waste material of the skin material used for the seat of the automobile is particularly hard to be powdered because the flexible urethane foam is laminated.

Further, the pair of metal rolls in the roll compression and crushing process rotate in a state of being brought into contact with each other by an urging force, and if the fibrous material can be torn, the number of roll rotations and the urging force values are arbitrary. Can be determined. Further, the biasing force acting on the pair of metal rolls is such that one metal roll is a fixed roll, the other metal roll is provided with a biasing means, and the other metal roll is biased to one metal roll. Can be made to act. As the urging means, one having a coil spring, a disc spring, a hydraulic device or the like for pressing the rotating shaft of the other metal roll to the one roll side can be adopted.

According to the present invention as described above, when the fibrous material is crushed, by performing the roll compression crushing step, the compressive force acts on the fibrous material by the biasing force of the pair of metal rolls. Since the fibrous material is stretched in the discharge direction of the roll due to the rotation of the roll, the fibers in the fibrous material are torn off and become fine fiber pieces, and the crushed material does not become cotton-like and is efficiently crushed. It is possible to obtain a fibrous material powder or chips that can be easily reused. Further, since it is possible to crush the fibrous material only with a crushing device mainly composed of a pair of rolls, it is possible to downsize the crushing equipment,
It is possible to simplify the structure of the device.

In the above, the method for crushing the fibrous material of the present invention comprises a crushing step of crushing the crushed product obtained by the roll compression crushing step and / or an ultra-fine crushing step of pulverizing. Is preferred. Here, the crushing step and / or the ultra-fine pulverizing step can be carried out using various known pulverizers, and preferably, a pulverizer having a function capable of ultra-fine pulverizing is adopted. As the crusher, a device that crushes with any of shearing force, impact force, and grinding force can be adopted. For example, a hammer mill, a jet mill or the like can be adopted as a device that only crushes.
In addition, as a device that can crush and pulverize thermosetting resin,
A screen mill, a screen mill described in JP-A-11-320558, a ball mill, a vibrating ball mill, a roller mill centrifugal classification type mill, or the like can be used. Then, as in the crushing step and / or the ultra-fine pulverizing step, either the crushing step or the ultra-fine pulverizing step may be carried out after the roll compression pulverizing step, or after the crushing step You may implement a pulverization process.

By thus providing the crushing step and / or the ultra-fine pulverizing step, even if the crushed material obtained by the roll compression crushing step is not completely pulverized, the crushing step is performed. Since it can be crushed, it is possible to reliably obtain a crushed product of a fibrous material that is easy to reuse.

Further, it is preferable that the above-mentioned roll compression and pulverization step is repeated a plurality of times. Here, in order to repeatedly perform the roll compression and crushing process a plurality of times, the crushed product once charged is again charged into a crushing device equipped with one set of metal rolls, and the roll compression and crushing process is performed a plurality of times. Although it may be carried out, a plurality of sets of metal rolls are provided in one device, and the pulverized product crushed by the first set of metal rolls is put into the second set of metal rolls. It is preferable that the pulverized material is further pulverized by the third set of metal rolls.

By repeating the roll compression and crushing process a plurality of times in this manner, the fibers in the fibrous material by stretching can be torn in multiple stages.
The fiber pieces can be shortened to obtain finer grinds of fibrous material. Further, since the roll compression and crushing step can be repeated a plurality of times simply by providing the crushing device with a plurality of sets of metal rolls, efficient crushing can be performed without increasing the size of the crushing device.

Furthermore, it is preferable that the pair of metal rolls in the above-mentioned roll compression / pulverization step compress the fibrous material at a pressure of 100 MPa or more, preferably 130 MPa or more. Here, the pressure is not the axial force acting on the shaft of one metal roll of the pair of metal rolls, but the pressure acting on the fibrous material in the linear portion along the contact portion of the metal roll. Means

The pressure can be measured by sandwiching a pressure measuring film containing a microcapsule containing a color-forming material between a pair of metal rolls, and after unloading, confirming the color-developed state of the film. For the pressure measurement film, a plurality of types can be prepared according to the magnitude of the acting pressure such as high pressure, medium pressure, low pressure, etc., and the approximate pressure can be measured based on the color development state of each type of film. . As a specific pressure measurement film, a prescale manufactured by Fuji Photo Film Co., Ltd. can be used. This prescale has a low pressure LW of 2.5 to 10 MPa, a medium pressure MW of 10 to 50 MPa, and a high pressure HS of 50 to 13.
It is configured so that it can be measured in the range of 0 MPa. Then, the biasing force between the pair of metal rolls may be adjusted so that the high pressure HS produces a range of 100 MPa or more.

Thus, in the roll compression and crushing process, 100M
By compressing the fibrous material with a pressure of Pa or more, the fibrous material can be reliably stretched with the rotation of the roll, so that the roll compression / pulverization step can be efficiently performed.

Further, the pulverizing method of the fibrous material of the present invention preferably comprises a cooling step of cooling the pair of rolls. This cooling step can be performed by installing a cooling mechanism inside the cylindrical metal roll, or can also be performed by spraying water on the outer peripheral portion of the metal roll. In the cooling step, either one of the pair of metal rolls may be cooled, or both of them may be cooled. By including the cooling step in this way, it is possible to suppress the heating of the metal roll accompanying the compression and pulverization,
The deformation of the pair of metal rolls due to heating can be prevented, and the roll compression and pulverization step can be carried out in a stable state.

In the roll compression and crushing step described above, it is preferable to add water to the fibrous material when the fibrous material is charged. The amount of water to be added may be an appropriate amount depending on the input amount of the material to be crushed, but as a general guide, it is preferable to add about 10 wt% with respect to the input amount of the fibrous material. By adding water in this way, the pulverization efficiency of the fibrous material is improved, and a pulverized product of shorter fiber pieces can be obtained.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a crushing system for carrying out a method for crushing a fibrous material according to an embodiment of the present invention. This crushing system consists of natural fiber materials such as cotton, tea, rush, etc., animal fiber materials such as silk, leather, wool, etc., synthetic leather in which fiber layers and synthetic resin layers are laminated, and composite materials such as tarpaulin. It is a system for crushing slag, and comprises a roll press 1, a crusher 2, an ultrafine pulverizer 3, and a collector 4.

The roll press 1 is a part for producing fibrous material chips or fibrous material powder by roll-compressing and grinding the above fibrous material. In this embodiment, the roll pressing machine 11 has two stages. , 12 are connected in series. The roll press machines 11 and 12 are
As shown in FIG. 2, the raw material charging hopper 21, the fixed roll 22, the movable roll 23, the urging device 24, and the crushed material recovery bucket 25 are provided.

The raw material feeding hopper 21 is a portion for feeding a fibrous material as a raw material, and is a crushed material recovery bucket 25.
Is a container for collecting the pulverized material pulverized by the roll press machines 11 and 12. The fixed roll 22 is made of a metal cylindrical body and is rotatably supported by a rotary shaft (not shown) provided in the press main body portion, and the rotary shaft is fixed to the press main body portion. .

Like the fixed roll 22, the movable roll 23 is made of a metal cylindrical body, is provided in the press main body portion, and is a rotary shaft that is movable in the approaching and separating directions with respect to the rotary shaft of the fixed roll 22. It is rotatably supported. Although not shown in FIG. 2, a cooling mechanism is provided inside the fixed roll 22 and the movable roll 23, and heating of these rolls 22 and 23 due to friction during crushing is suppressed by this cooling mechanism. . The diameter x length of these rolls 22 and 23 is, for example, 150 mm x 150 mm or 300 mm
× 300mm is used. In addition, the fixed roll 22
The movable roll 23 is configured to rotate in synchronization with a drive unit such as a motor, and the rotation number of the rolls 22 and 23 can be arbitrarily adjusted by adjusting the drive unit.

The urging device 24 is a urging means for urging the movable roll 23 in the direction of approaching the fixed roll 22, and has a shaft portion 241 whose tip abuts the outer peripheral surface of the movable roll 23.
A plurality of disc springs 242 inserted between the press body portion of the shaft portion 241 and the movable roll 23, and a pressing force adjusting screw provided on the base end portion of the shaft portion 241 for adjusting the biasing force of the movable roll 23. And 243. By adjusting the pressing force adjusting screw 243, the pressing force of the shaft portion 241 against the movable roll 23 changes, and the fixed roll 2
The urging force acting between the two and the movable roll 23 can be adjusted.

The urging force adjusted by the urging device 24 is
The pressure is set to 100 MPa in the upper and lower regions of the width 2.5 mm that sandwich the contact line between the fixed roll 22 and the movable roll 23. The setting of the urging force is performed by using the pressure measuring film described above. First, the movable roll 23 is fixed to the fixed roll 22.
The pressure measuring film for high pressure is inserted between the fixed roll 22 and the movable roll 23 in a state of being separated from the above, and the pressing force adjusting screw 243 is rotated to generate a biasing force between the fixed roll 22 and the movable roll 23. Then, the pressure measurement film is tightened until the area of the area is in a color-developed state of 100 MPa.

The crusher 2 is a machine for crushing the crushed material crushed by the roll press 1 by utilizing a shearing force, and a screen mill is used in this embodiment. This screen mill includes a tubular body and a rotary blade provided in the tubular body, and performs crushing by utilizing the shearing force between the fixed blade formed on the inner surface of the tubular body and the rotary blade. By arranging a screen at the discharge side opening portion of the cylindrical body, the crushed material is repeatedly crushed until the charged raw material is crushed to a predetermined size.

In the screen mill as the crusher 2, when the clearance between the fixed blade and the rotary blade is set to 2 to 5 mm and the screen mesh diameter on the discharge side is set to 1 to 8 mmφ,
Used as a crusher. On the other hand, when the clearance between the fixed blade and the rotary blade is set to 0.2 to 2 mm and the screen mesh diameter on the discharge side is set to 0.5 to 1 mmφ, it is used as a fine pulverizer. Such a crusher 2 is used when the raw material fibrous material is a composite material such as synthetic leather or tarpaulin in which a fiber layer and a synthetic resin layer are laminated, or a cotton fabric is crushed by the roll press 1, and roll compression crushing is performed. The crushed material obtained by the above is collected in the bucket 2A.

The ultra-micronizing device 3 is for pulverizing plant fiber natural materials such as cotton, tea and rush, and animal fiber natural materials such as silk, leather and wool into ultrafine powder. In the embodiment, a single track jet mill is adopted. This single-track jet mill has a compressed air flow path configured in a ring shape, a classifier connected to a part of this compressed air flow path, and a hopper for charging raw materials. The pulverized product of the plant-based or animal-based fibrous natural material that has passed through is circulated in the compressed air flow path so that the pulverized products collide with each other and become fine powder, The fine powder pulverized to the particle size of is collected in a classifier and sent to the collector 4. In order to further reduce the particle size, it is preferable to install a ball mill in front of the single track jet mill and finely pulverize the product crushed by the ball mill with the single track jet mill. Further, by crushing and compressing with the roll press 1 before charging into the ball mill, the charging amount into the ball mill is increased, the crushing time is shortened, and the economical efficiency is improved.

The collector 4 is a device for collecting finely ground fine powder of a fibrous natural material having a predetermined particle size, and has a cylindrical body and an air flow generation for generating a rotating air flow inside the cylindrical body. A fine powder of a fibrous natural material, which is provided with a device and a classifier provided in the lower part of the cylindrical body and cannot be collected by the collector 4, is a bag filter (not shown) installed in the latter stage of the collector 4. Be recovered by.

Next, a procedure for crushing a fibrous material using the above-described fibrous material crushing system will be described. (1) The fibrous material obtained as a waste material is put into the first stage raw material feeding hopper 21 of the roll press 1, and the crushing of the fibrous material by the roll press 1 is started (roll compression crushing step). The amount of fibrous material input to the raw material input hopper 21 is approximately 10 kg / h, and the roll speed is 1
Set to about 0 rpm. At this time, if necessary,
About 10 wt% of water is charged into the raw material charging hopper 21.

(2) In parallel with this roll compression and crushing process,
Cooling water is circulated through the cooling mechanism inside the fixed roll 22 and the movable roll 23, and the rolls 22 and 23 heated by the frictional heat generated when the fibrous material is crushed are cooled by the cooling mechanism (cooling step). (3) After the roll compression and crushing by the first roll pressing machine 11 is completed, the crushed material of the fibrous material is charged into the raw material charging hopper 21 of the second stage roll pressing machine 12,
Start the second roll compaction. The specific crushing conditions, cooling of the rolls 22 and 23, etc. are the same as in the first time.

(4) When the fibrous material used as the raw material is a composite material such as synthetic leather or tarpaulin and a laminated material of these and urethane foam, roll press 1
The crushed product crushed in (1) is put into the crusher 2 to crush the crushed product (crushing step). Amount of crushed material is 20kg / h
As a guide, the rotation speed of the rotary blade is set to about 1000 rpm. Further, if the clearance between the fixed blade and the rotary blade is set to 5 mm and the discharge screen mesh diameter is set to 8 mmφ, crushing is performed to obtain a chip-shaped crushed product of about 5 mm square, and this crushed product is collected in the bucket 2A.

(5) When the fibrous material used as a raw material is a plant fiber natural material such as tea or rush, or an animal fiber natural material such as silk, leather or wool, it is crushed by the roll press 1. The pulverized product is sent to the ultra-fine pulverizing device 3, and pulverized by the ultra-fine pulverizing device 3 to be a fine powder of a natural organic substance, which is then sent to the collector 4 to collect the fine powder of the natural organic substance.

According to this embodiment as described above, the following effects can be obtained. When the fibrous material is crushed, a compressing force acts on the fibrous material by the urging force of the pair of metal rolls 22 and 23 by performing the roll compression crushing step, and the fibrous material is rotated by the rotation of the rolls 22 and 23. Since the material is stretched in the discharge direction of the roll, the fibers in the fibrous material are torn off to form fine fiber pieces, and the crushed material can be efficiently crushed without forming a cotton-like shape. A fibrous material powder or chips that are easy to use can be obtained. Also, a pair of rolls 2
Since the fibrous material can be crushed only by the roll press 1 mainly composed of Nos. 2 and 23, the crushing equipment can be downsized and the structure of the device can be simplified.

Further, by providing the crushing step as described above, even if the crushed product obtained by the roll compression crushing step is not completely pulverized, it can be crushed in the crushing step. Therefore, it is possible to reliably obtain a pulverized product of the fibrous material that is easy to reuse. Then, by repeating the roll compression and pulverization process a plurality of times, the fibers in the fibrous material due to stretching can be torn in multiple stages, so that the fiber piece is shortened and a finer fibrous material is obtained. Can be obtained.

Further, by simply connecting the roll press machines 11 and 12 in series, the roll press 1 capable of crushing in multiple stages can be obtained, so that the crushing device does not become large and efficient crushing is performed. be able to. Further, by compressing the fibrous material at a pressure of 100 MPa or more in the roll compression and pulverization step, the fibrous material can be reliably stretched with the rotation of the rolls 22 and 23, so that the roll compression and pulverization step can be performed efficiently. Can be done.

By providing the cooling process by the cooling mechanism inside the rolls 22 and 23, it is possible to suppress the heating of the metal rolls 22 and 23 due to the compression and crushing. It is possible to prevent deformation and the like due to heating, and it is possible to carry out the roll compression crushing process in a stable state. Further, by adding water during the roll compression pulverization step, the pulverization efficiency of the fibrous material is improved, and a pulverized product of shorter fiber pieces can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, but includes the following modifications. In the above-described embodiment, the roll press 4 connects the two roll press machines 11 and 12 in series, but the present invention is not limited to this, and 3 to 5 roll press machines are connected in series, and 3 to 5 roll press machines are connected. You may repeat a roll compression grinding process 5 times.

In the above embodiment, the single-track jet mill is used as the pulverizing device 3 for pulverizing tea or the like, but other types of jet mills, ball mills or the like may be used. Further, in the above-described embodiment, the screen mill is used as the crusher 2 that performs the crushing process, but the present invention is not limited to this, and other crushers such as an impeller mill may be used. In addition, the specific structure, shape, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0039]

EXAMPLES The present invention will be described more specifically below with reference to examples and comparative examples. The present invention is not limited to the contents of the embodiment. [Example 1] A plant fiber natural material such as tea produced as a waste material from the beverage manufacturing industry is dried and then subjected to a roll compression pulverization process using a roll press machine 11 shown in FIG. Crushing was carried out by the chemical conversion device 3 to obtain a fine powder of a plant fiber natural material. In the first roll compression / pulverization step, 10 wt% of water is added to tea to perform compression / pulverization. Other crushing conditions are as follows. Roll press machine 11: Roll press DP-150 type (manufactured by Seishin Enterprise Co., Ltd.) Roll diameter × roll length: 150 mm × 150 mm Roll rotation speed: 10 rpm Input amount: 10 kg / h Ultrafine atomizer 3: STJ-200 (jet Mill, manufactured by Seishin Enterprise Co., Ltd. Air pressure: 7 kg / cm ² Input amount: 10 kg / h

Example 2 The object to be crushed was a laminate material of polyester woven fabric and urethane foam, which is a laminate of a fiber layer and a synthetic resin layer, and the roll press crushing process was repeated twice with the roll press 11. The crushing process by the crusher 2 was performed to obtain a chip-shaped pulverized fibrous material. The crushing conditions are as follows. Roll press machine 11: Roll press DP-150 type (manufactured by Seishin Enterprise Co., Ltd.) Roll diameter × roll length: 150 mm × 150 mm Roll rotation number: 10 rpm Watering condition: 10 wt% Pass number: 2 passes Input amount: 10 kg / h Crusher 2: manufactured by Horai Co., Ltd., mesh mill HA-2542 Rotating blade rotation speed: 2500 rpm Fixed blade-rotating blade clearance: 2 mm Discharge screen mesh diameter: 2 mm Input amount: 20 kg / h

Example 3 A crushed product of a cotton woven fabric was obtained by the same operation as in Example 2 except that the crushed product was a cotton woven fabric such as shirts and sheets, and the crusher 2 was changed to the following specifications. Crusher 2: Orient Mill VM-20, manufactured by Orient Co., Ltd. Rotating blade rotation speed: 1000 rpm Fixed blade-rotating blade clearance: 5 mm Discharge screen mesh diameter: 8 mm [Example 4] The crushed object is made of PVC and cotton fabric. A pulverized tarpaulin material was obtained by the same operation as in Example 3 except that the tarpaulin material was used.

[Comparative Example 1] A material similar to that of Example 1 was used as an object to be crushed, and after roughly crushing with a screen mill,
Without performing roll compression crushing by the roll press 1.
Fine powder pulverization was performed by the fine pulverizer 3 to obtain a powder of a fiber-based natural material. The pulverization conditions by the pulverizer 3 are the same as in Example 1, and the pulverization conditions of the screen mill are as follows.
It is as follows. The average particle size of the pulverized product after coarse pulverization with a screen mill was 2 mm. Screen mill: Orient Co., Ltd., Orient mill VM-20 type Rotating blade rotation speed: 1000 rpm Fixed blade-rotating blade clearance: 2 mm Discharge screen mesh diameter: 2 mm Input amount: 10 kg / h

[Comparative Example 2] The same material as in Example 2 was used as an object to be crushed, and crushed under the crushing conditions of the screen mill of Example 2 to obtain a crushed product. [Comparative Example 3] A material similar to that in Example 3 was used as the object to be crushed.
Crushing was performed under the crushing conditions of the screen mill of Comparative Example 1 to obtain a crushed product. [Comparative Example 4] The same material as in Example 4 was used as an object to be crushed.
Crushing was performed under the crushing conditions of the screen mill of Comparative Example 1 to obtain a crushed product. Examples 1 to 4, Comparative Examples 1 to 4
The results are shown in Table 1.

[0044]

[Table 1]

Comparing Example 1 and Comparative Example 1, in the case of a plant fiber natural material such as tea, the average particle size of fine powder of the fiber natural material was obtained by carrying out the roll compression crushing step by the roll press 1. It can be seen that the diameter can be made smaller and the maximum particle diameter can be made significantly smaller. Comparative Example 1
Since the powder of has some fiber residue and can not be used as it is,
Furthermore, it is necessary to carry out the classification process in the latter stage.

In addition, Example 2 and Comparative Example 2 and Example 3
When comparing Comparative Example 3, Example 4 and Comparative Example 4, the pulverized product by the screen mill and roll press 1 was
It is in the form of powder or chips. However, in Comparative Example 2, Comparative Example 3, and Comparative Example 4, the fibers were not cut into short pieces and a lot of fluff was conspicuous, and even if they were thrown into a molding machine or the like as they were, they were melted and reused, they were molded. Can not. On the other hand, in the case of Example 2, Example 3, and Example 4, since there is no fluff and the fibers are sufficiently cut, it is possible to put them in a molding machine or the like and reuse them.

[0047]

According to the present invention as described above, there is an effect that a fibrous material containing fibers can be efficiently pulverized to obtain a fibrous material powder which can be easily reused.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a crushing system for carrying out a crushing method of a thermosetting resin foam according to an embodiment of the present invention.

FIG. 2 is a side view showing a structure of a roll pressing machine for carrying out a roll compression pulverizing step in the embodiment.

[Explanation of symbols]

1 roll press (roll compression crushing process) 2 crusher (crushing process)

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Claims (9)

[Claims] 1. A method for crushing a fibrous material, which comprises crushing a fibrous material containing fibers, wherein the fibrous material is introduced between a pair of metal rolls that rotate while being biased in directions toward each other. A method of crushing a fibrous material, comprising a roll compression crushing step of compressing and crushing the fiber material. 2. The method for crushing a fibrous material according to claim 1, further comprising a crushing step of crushing the crushed material obtained by the roll compression crushing step and / or an ultrafine crushing step of pulverizing the crushed material. A method for pulverizing a fibrous material, characterized in that 3. The method for pulverizing a fibrous material according to claim 1, wherein the roll compression pulverizing step is repeated a plurality of times. 4. The method for pulverizing a fibrous material according to claim 1, wherein the pair of metal rolls in the roll compression pulverizing step is configured to remove the fibrous material at a pressure of 100 MPa or more. A method for pulverizing a fibrous material, which comprises compressing. 5. The method for crushing a fibrous material according to claim 1, further comprising a cooling step for cooling the pair of rolls. . 6. The method of crushing a fibrous material according to claim 1, wherein the roll compression crushing step comprises:
A method for pulverizing a fibrous material, which comprises adding water to the fibrous material. 7. The method for pulverizing a fibrous material according to any one of claims 1 to 6, wherein the fibrous material is a natural plant-based fibrous material such as cotton, tea, or rush. And the method of crushing fibrous material. 8. The method for pulverizing a fibrous material according to claim 1, wherein the fibrous material is a natural animal fibrous material such as silk, leather or wool. And the method of crushing fibrous material. 9. The crushing method of a fibrous material according to claim 1, wherein the fibrous material is a single material of a fiber layer, or a composite material in which a fiber layer and a synthetic resin layer are laminated. A method for crushing a fibrous material, characterized by being composed of a raw material.