JP3078725B2 - Manufacturing method of fixed grain and manufacturing apparatus of fixed grain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing fixed grains and an apparatus for producing fixed grains. The present invention relates to a method and an apparatus for manufacturing fixed grains formed by fixing surface grains.

[0002]

2. Description of the Related Art As a technique related to the present invention, PC
T JP94 / 00351 (International publication number; WO94
/ 20280) "cellulose-based fine powder,
Fig. 7 shows the technology of "woody molded products and woody products".
This will be briefly described with reference to FIG. This FIG.
1 is a flowchart showing a process until a wood-like molded product described in JP94 / 00351 is formed.

A powder obtained by pulverizing a cellulose material as a raw material is subjected to a grinding treatment to obtain powder particles having an increased bulk specific gravity, and the outer peripheral surface of the powder particles has a surface particle smaller in diameter and harder than the powder particles. Are fixed to form fixed particles, and the resin and the pigment are mixed and melted in the fixed particles, and thereafter or simultaneously with the melting, formed into a desired shape by extrusion molding or injection molding. Then, it is possible to provide a method of manufacturing a wood-like product and a wood-like product having a pattern very close to the grain of a natural tree on the surface and having a feeling such as a touch feeling similar to that of a natural tree.

[0004] This will be described in more detail. The pulverized powder obtained by pulverizing the cellulose material as a raw material does not form a granular shape as it is, and many of the fibers are in a state where the fibers protrude in a whisker form, and when used in a resin, whiskers In many cases, the fibers are entangled with each other to create an agglomerated state, and the fibers are not uniformly dispersed in the resin material. Therefore,
By grinding the pulverized powder to obtain powder particles having an increased bulk specific gravity, it is necessary to uniformly disperse the powder without entanglement.

Further, when such powder particles are directly mixed with a resin as it is and molded, the characteristics of the powder particles and the resin,
The properties or functions of the molded product are determined solely by its function, and the softness or poor fluidity of the powder affects the workability, resulting in poor workability, baking during extrusion, and the brittleness of the molded product. there were. Therefore, fixed particles are formed by fixing a surface particle (for example, one or more materials of an inorganic material, a metal material, or a plastic material) having a smaller diameter and harder than the particle on the outer peripheral surface of the particle. Then, the fixed grains were mixed with the resin and molded.
This is because it has been found that by doing so, the workability is improved because the flowability can be improved, and the characteristics of the molded article can be changed by selecting the surface grains.

[0006] In the grinding treatment for increasing the bulk specific gravity, a ball mill such as a container-rotating type ball mill in which a grinding ball is vertically and circumferentially stirred by a stirring means and the grinding balls are ground by the action of friction between the grinding balls. Was selected.
When processed by a ball mill using grinding balls,
Not only can the size be uniformed, but also the whiskers can be eliminated, and the addition of surface particles into a ball mill can also fix the surface particles at the same time. For it was found.

[0007]

When a wood-like product is manufactured using the fixed grains produced as described above, first, the fixed grains are mixed to produce a wood-forming seed material.
The wood forming seed material is melted and formed into a desired shape. However, when producing a woody seed material, it takes a considerable amount of time to mix the resin and the fixed grains. As a result of repeating the experiment based on various studies to determine the cause of the time required for mixing the resin and the fixed particles, the difference in the specific gravity of the two in the mixing process of the resin and the fixed particles, It has a subtle effect on the mixing, and it has been found that the higher the specific gravity of the fixed grains, the easier it is to mix.

[0008] The present invention has been made in view of the fact that, in the conventional production of fixed grains, no measures have been taken to increase the bulk specific gravity of the fixed grains. That is, the problem to be solved by the present invention is to provide a technique for producing fixed grains capable of increasing the bulk specific gravity. Here, an object of the invention described in claims 1 to 3 and claims 5 to 7 is to provide a method for producing fixed grains capable of increasing the bulk specific gravity.

Another object of the present invention is to provide an apparatus for producing fixed grains capable of increasing the bulk specific gravity.

[0010]

SUMMARY OF THE INVENTION The present invention is to achieve the above object. The method for producing fixed grains according to claim 1 compresses the crushed powder (B2) obtained by crushing the cellulose material (B1) (B3), and applies the crushed powder to the outer peripheral surface of the crushed powder (B3). The method is characterized in that fixed particles are formed (B4-1, B4-2) by fixing surface particles smaller in diameter and harder than the pulverized powder (B2).

The “pulverized powder” referred to herein is a maximum of 35
A concept that includes not only "crushed particles" obtained by pulverizing a cellulose material until it can pass through a mesh of 0 micron square or less, but also "powder particles" obtained by grinding the "crushed particles" to increase the bulk specific gravity. And The same applies to the following claims.
In addition, the method of “compressing the pulverized powder” includes a known means of compressing powder such as a means using a press or a roller. The same applies to the following claims. However, in a device for manufacturing fixed grains by grinding the ground powder and the surface grains with a ball mill using a ball mill, means that does not have another step of “compressing the ground powder” as a step other than the grinding processing For example, it does not include means for making the time for performing the grinding process longer than before.

The method for producing fixed grains according to the second aspect is technically limited to the method for producing the fixed grains according to the first aspect, and is obtained by pulverizing the cellulose material (B1). Compress the pulverized powder (B2) (B3), and in the mixing vessel (14) for mixing the outer peripheral surface of the compressed pulverized powder (B3) with a surface particle having a smaller diameter and harder than the pulverized powder. Storing the mixed container (1
4) The ground powder (B3) and the surface particles are mixed by rotating, and fixed particles are formed by fixing the surface particles to the surface of the ground powder (B2) by an impact means for giving an impact force (B4-2). It is characterized by having decided to do.

[0013] The term "impact means" as used herein is a concept including a hammer device that vibrates or reciprocates at high speed in addition to the one disclosed in claim 3. The method for producing fixed grains according to claim 3 is a technical limitation of the method for producing fixed grains according to claim 2, wherein the impact means is provided for mixing inside the mixing vessel (14). In the direction opposite to the rotation direction of the mixing container (14) about the rotation axis (22) that is offset from the rotation axis (13) of the container (14),
This is achieved by an impact tool (20) that forms fixed grains by rotating at a higher speed than (14).

[0014] The apparatus for manufacturing fixed grains according to claim 4 comprises a machine base (11) and a compression apparatus (B3) for compressing a pulverized powder (B2) obtained by pulverizing a cellulose material (B1). And a mixing container (14) rotatable with respect to the machine stand (11) and capable of storing and mixing the compressed pulverized powder (B2) and the smaller and harder surface particles than the pulverized powder (B2). ), And mixing inside the mixing container (14) in a direction opposite to the rotation direction of the mixing container (14) about the rotation axis (22) that is offset from the rotation axis (13) of the mixing container (14). Container (1
An impact tool (20) for fixing surface grains to the surface of the pulverized powder (B2) by rotating at a higher speed than 4) to form fixed grains is provided.

According to a fifth aspect of the present invention, there is provided a method for producing fixed particles, comprising the steps of: pulverizing a powder (A2) obtained by pulverizing a cellulose material (A1); and a surface particle having a smaller diameter and a harder particle than the pulverized powder (A2). It is characterized in that fixed grains (A3-1, A3-2) are formed by fixing, and the fixed grains (A3-1, A3-2) are compressed (A4). The method for producing fixed particles according to claim 6 is to mix the ground powder (A2) obtained by grinding the cellulose material (A1) with the surface particles having a smaller diameter and harder than the ground powder (A2). The powder (A2) is mixed with the surface particles by rotating the mixing container (14), and the surface of the powder (A2) is mixed by impact means for applying an impact force. Fix the surface grains to the fixed grains (A
3-2) is formed, and the fixed grains (A3-2) are compressed (A4).

A method for producing fixed grains according to a seventh aspect of the present invention is technically limited to the method for producing fixed grains according to the sixth aspect. The rotation axis which is deviated from the rotation axis (13) of the mixing vessel (14) inside
This is achieved by an impact tool (20) that forms fixed grains by rotating at a higher speed than the mixing container (14) in the direction opposite to the rotation direction of the mixing container (14) around the (22). And

The apparatus for producing fixed grains according to claim 8 is a machine base (11) and a ground powder rotatable with respect to the machine base (11) and obtained by grinding the cellulose material (A1). (A2) and its ground powder
A mixing container (14) capable of containing and mixing smaller-diameter and harder surface particles than (A2), and rotation of the mixing container (14) inside the mixing container (14) offset from the rotation axis (13) of the mixing container (14). In the direction opposite to the rotation direction of the mixing vessel (14) about the axis (22), the mixing vessel (14)
An impact tool (2) that fixes the surface grains to the surface of the pulverized powder (A2) by rotating at a higher speed to form fixed grains (A3-2)
0) and a compression device (A4) for compressing the fixed grains (A3-2).

[0018]

The method for producing fixed grains according to claim 1 includes:
It works as follows. Since the crushed powder (B2) obtained by crushing the cellulose material (B1) is compressed (B3), the compressed powder (B3) has a smaller diameter than the crushed powder (B2) on the outer peripheral surface of the crushed powder (B3). And fixed grains (B4-1, B4-
2) has a higher bulk specific gravity than fixed grains that have not been subjected to a compression step.

The method for producing fixed grains according to the second aspect differs from the method for producing fixed grains according to the first aspect, and has the following effects. That is, after compressing the crushed powder (B2) obtained by crushing the cellulose material (B1) (B3), the crushed powder,
When the mixing container (14) is rotated and the mixing container (14) is rotated, the crushed powder and the surface particles are mixed, and the mixed material is mixed. Is formed. By applying an impact force to the mixed material by the impact means, surface particles are fixed on the surface of the pulverized powder, and fixed particles are formed (B4-2).

The method for producing fixed grains according to the third aspect differs from the method for producing fixed grains according to the second aspect, and operates as follows. In other words, the impact tool (2
(0) is the direction of rotation of the mixing vessel (14) about the rotation axis (22), and the direction of rotation of the pulverized powder and the surface grains rotating around the impact tool (20), It rotates faster than 14). Then, an impact is given by the impact tool (20) rotating in the reverse direction at a high speed, and the surface grains are fixed to the surface of the pulverized powder to form fixed grains.

[0021] The apparatus for manufacturing fixed grains according to the fourth aspect has the following action as an action different from that of the apparatus for manufacturing fixed grains according to the third aspect. First, a pulverized powder (B2) obtained by pulverizing the cellulose material (B1) is compressed by a compression device (B3). Then, a pulverized powder having an increased bulk specific gravity is obtained. Next, the compressed pulverized powder and the surface particles are accommodated in a mixing container (14), and when the mixing container (14) is rotated, the pulverized powder and the surface particles are mixed.

An impact tool (20) inside the mixing vessel (14)
Of the mixing container (14) in a direction opposite to the rotation direction of the mixing container (14) about the rotation axis (22) that is offset from the rotation axis (13) of the mixing container (14).
Rotate faster than (14). Thereby ground powder (B2)
The fixed grains are formed by fixing the surface grains on the surface of (B4-
2). The fixed grains (B4-2) thus formed have a higher bulk specific gravity than the fixed grains that have not been subjected to the compression step.

The method for producing fixed grains according to the fifth aspect has the following effects. That is, a cellulose material
(A1) is pulverized to form a pulverized powder (A2), and surface particles are fixed to the surface of the pulverized powder (A2) to form fixed particles (A3-1, A3-2), and the fixed particles (A3). A3-1 and A3-2) are compressed (A4). The fixed grains (A3-1, A3-2) thus formed have a higher bulk specific gravity than fixed grains that have not been subjected to the compression step.

The method for producing fixed grains according to the sixth aspect has the following effect as an action different from the method for producing the fixed grains according to the fifth aspect. That is, ground powder
An impact means is employed as a means for fixing the surface grains to the surface of (A2), and the impact means applies an impact force to the pulverized powder (A2) and the surface grains to form fixed grains (A3-2).

The method for producing fixed grains according to the seventh aspect has the following operation as an action different from that of the apparatus for producing fixed grains according to the sixth aspect. That is, the impact tool (20) is rotated inside the mixing vessel (14) around the rotation axis (22) shifted from the rotation axis (13) of the mixing vessel (14).
By rotating at a higher speed than the mixing vessel (14) in the direction opposite to the rotation direction of 4), fixed particles (A3-2) are formed by applying an impact force to the pulverized powder (A2) and the surface particles. I do.

The method for producing fixed grains according to the present invention has the following effects. First, cellulose material (A1)
Is ground to obtain a ground powder (A2). Next, the pulverized powder (A2) and the surface particles are stored in a mixing container (14), and the mixing container (1
4) Rotate. Then, the pulverized powder and the surface particles are mixed. Next, an impact tool (20) is set inside the mixing vessel (14).
Of the mixing container (14) in a direction opposite to the rotation direction of the mixing container (14) about the rotation axis (22) that is offset from the rotation axis (13) of the mixing container (14).
Rotate faster than (14). Thereby ground powder (A2)
The fixed grains are formed by fixing the surface grains on the surface of (A3-
2). The fixed grains (A3-2) thus produced are compressed by the compression device (A4). Then, fixed grains having increased bulk specific gravity are obtained. The fixed grains thus formed have a higher bulk specific gravity than fixed grains that have not been subjected to a compression step.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments and drawings.
This will be described in more detail. The drawings used here are FIGS. 1 to 6. FIG. 1 is a flow chart showing a first embodiment of a method for producing fixed grains according to the present invention. FIG. 2 is a flowchart showing a second embodiment of the method for producing fixed grains according to the present invention. 3 to 5 are conceptual diagrams showing examples of the compression means according to the fixed grain manufacturing technique according to the present invention. FIG. 6 is a conceptual diagram showing one embodiment of a part of the fixed grain manufacturing apparatus according to the present invention.

First, the steps required to produce a woody product will be described with reference to FIG. 1 for the first embodiment.
First, the pulverized powder B2 obtained by pulverizing the cellulosic material B1 is compressed, and fixed to the outer peripheral surface of the pulverized powder B3 after the compression, a fixed surface particle smaller in diameter and harder than the pulverized powder B4 is fixed.
Form 2 Next, a resin and a pigment are mixed with the fixed grains B4-2 to form a wood-like seed material B5, and a resin-based material is mixed with the wood-like seed material B5 and melted. By doing so, a wood-like product B6 is formed.

This will be described in more detail. The “pulverized powder B2” referred to here is “pulverized particles” obtained by pulverizing a cellulose material until it can pass through a mesh of 350 μm square or less at the maximum. In view of the quality of the woody product as the final product, a pulverized powder which is pulverized until it can pass through a mesh of 150 μm square or less is preferable. It is more preferable that the pulverized powder has been subjected to a grinding treatment for increasing the bulk specific gravity. In this case, “pulverized particles” pulverized so as to be able to pass through a 150 μm square mesh are used.

As a method of "compressing the pulverized powder B2", a press B3 shown in FIG. 5 is employed. It is desirable that the press B3 used here has a compression performance of 300 kg / cm 2 or more. Other methods of “compressing the pulverized powder B2” include a combination of a transport belt and a roller shown in FIG. 3 and a combination of two opposing rollers shown in FIG. The method of FIG. 3 is effective when the production line extends in the horizontal direction, and the method of FIG. 4 is effective when the production line is vertical.

The pulverized powder whose bulk specific gravity has been increased by compression is
The fixed particles B4− by the stirring and mixing device 10 as shown in FIG.
It becomes 2. The stirring and mixing device 10 includes a machine base 11 serving as a base of the entire apparatus, a stirring motor 12 fixed to the machine base 11, a rotating shaft 13 rotated by the stirring motor 12, and a rotating shaft 13 By the rotation of 13,
Cylindrical mixing vessel 14 that rotates via transmission gear 13A
And

The machine base 11 has the stirring motor 12 fixed so that the axial direction of the rotating shaft 13 is vertical. Also,
A vertical support 15 that rotatably supports the mixing container 14
Further, a gear shaft 13C, which is a support shaft of a horizontal support gear 13B rotatably supporting the mixing container 14 so as not to move in the horizontal direction, is also fixed. In the present embodiment, a 2-speed motor (0.25 kw / 0.37 kw) is employed as the stirring motor 12, and the rotation speed is from 1000 rpm to 600 rpm.
0 rpm, and the rotation speed of the mixing container 14 rotating via the transmission gear 13A is from 10 rpm to 100 rpm.
m.

The stirring and mixing device 10 includes an impact tool 20 for fixing surface particles to the surface of the pulverized powder inside the mixing container 14 to form fixed particles, a pulverized powder stacked on the bottom of the mixing container 14 and A hoisting device 30 for hoisting the surface grains or the already formed fixed grains. The impact tool 20 includes an impact motor 21 installed outside the mixing vessel 14 and the impact motor 2
1, a main shaft 23 that rotates inside the mixing vessel 14 by the rotation of the rotary shaft 22,
A blade-like agitator 24 is provided at right angles to the main shaft 23. The rotating shaft 22 and the main shaft 23 are perpendicular to each other, but are at positions deviated from the axial direction of the rotating shaft 13 of the mixing container 14.

The impact motor 21 is provided in the mixing vessel 1.
4 rotates at a higher speed than the mixing container 14 in a direction opposite to the rotation direction. In this embodiment, the third speed (0.25 kw / 0.5 kw / 1.0 k
w) motor is adopted. The shape of the agitator 24 may be a simple round bar shape, but in this embodiment, although not shown in detail, the agitator 24 has a shape capable of pressing the powder colliding against the agitator 24 against the bottom surface of the mixing container 14. I have. Therefore, the powder that collides with the agitator 24 also collides with the bottom surface of the mixing container 14.

The agitator 24 has been subjected to a surface hardening treatment using a material resistant to wear. For example, it is a wear-resistant article such as carbon or nitride carbide. The speed of the spindle 23 due to the rotation of the shock motor 21 is 3000 rpm
m, but depending on the conditions such as the amount of the mixed material and the stirring time, it is possible to form fixed grains even at 1000 rpm or less, and it is possible to achieve a speed of 6000 rpm or more, and even in this case, it is possible to form fixed grains. It is.

The hoisting device 30 includes a hoisting motor 31 installed outside the mixing container 14, a rotating shaft 32 rotated by the hoisting motor 31, and a rotation inside the mixing container 14 by the rotation of the rotating shaft 32. Main shaft 23, branch shafts 34, 34 branching off at the tip of the main shaft 23, and a scoop portion 35 for holding pulverized powder and surface particles stacked on the bottom of the mixing container 14 at one end of the branch shaft 34. Are formed.

A roller device 40 that rotates in contact with the bottom surface of the mixing container 14 is provided at the tip of the branch shaft 34 different from the one to which the scoop portion 35 is fixed. This roller device 4
If 0 is provided, the bulk specific gravity of the fixed grains can be further increased. Since the side surface of the mixing container 14 has a cylindrical shape, the roller device 40 may rotate in contact with the side surface of the mixing container 14. Alternatively, the roller device 40 may be provided with no rotary power source, and rotated by contacting the inner wall surface of the mixing container 14.

At the bottom of the mixing vessel 14, a falling lid 14A is provided which allows the formed fixed grains to fall below the mixing vessel 14. The inner surface at the bottom of the mixing container 14 is desirably a flat surface having no concave portions or convex portions in order to efficiently drop the formed fixed grains. In the mixing container 14, a ventilation device capable of exchanging air in the mixing container 14 is formed so as to be separately provided. Here, the “ventilator” is, for example, in the present embodiment, the ventilation ports 16, 16 provided at the upper part of the mixing container 14 for replacing air in the mixing container 14.
And an air injection device 50 for sending air into the mixing container 14 and a degassing device 60 for removing air from the mixing container 14.

Although not shown, filters are provided in the ventilation ports 16. In addition, the air injection device 5
0 is provided with a filter 51 for removing foreign matter from the air to be sent. In addition, the deaerator 60 includes a suction pump 61 for removing air from the mixing container 14 and a filter 62 for preventing powder in the mixing container 14 from coming out of the mixing container 14. .

Incidentally, it is desirable that the air sent from the air injection device 50 is dry air. Specifically, by providing a dryer in the compressor used to feed air. It is desirable that the compressor be auto-dry and oil-free. Further, it is preferable that the air fed from the air injection device 50 be blown to a place where the powder to be mixed is easily accumulated, such as the vicinity of the branch shafts 34 and 34 of the hoisting device 30 and the scoop portion 35.

As another ventilation device, a ventilation port 16 is used.
And a combination of the air vent device 16 and the air injection device 50. Although not shown, a sensor is provided inside the mixing container 14. The sensor referred to here is a temperature of 0 to 200 degrees Celsius and a moisture of 0 to 6 degrees Celsius.
It is an environmental sensor that can measure in the range of%. The rotational speed of the agitator 24, the ventilation rate, and the like can be controlled based on the measured values.

Next, the operation of the stirring and mixing apparatus 10 will be described. First, in order to mix the ground powder and the surface particles, they are stored in the mixing container 14. When the stirring motor 12 fixed to the machine base 11 rotates the mixing container 14 at 60 rpm via the rotating shaft 13, the pulverized powder and the surface grains are mixed to form a mixed material.

When the impact force is applied to the mixed material by the impact means, the surface grains are fixed to the surface of the pulverized powder, and the fixed grains are formed. That is, in the impact tool 20 as the impact means, the agitator 24 rotates in the direction opposite to the rotation direction of the mixing container 14 around the rotation shaft 22 and the main shaft 23 rotated by the impact motor 21 rotating at about 3000 rpm. . The mixed material is rotated around the impact tool 20 by the stirring motor 12, but since the agitator 24 is rotating in a direction opposite to that of the mixed material at a high speed, the mixed material is beaten to the agitator 24 and immediately thereafter. Part is mixing container 14
Can be knocked on the inner wall of the building. By these actions, surface particles are fixed on the surface of the pulverized powder, and fixed particles are formed.

During the above operation, the mixing vessel 14
The inside of the mixing container is detected by a sensor, and the ventilation device is operated to exchange the air in the mixing container. For this reason, the steam generated during the mixing and stirring is discharged, and the occurrence of dew condensation is prevented. Also, F
The rotational speed of the agitator 24 is controlled in accordance with the detection result of the K sensor to improve the quality of fixed grains. Mixing container 14
When the temperature in the inside increases, the operation of the ventilator may be strengthened to lower the temperature in the mixing container 14 to improve the quality of the fixed grains.

When mixing the pulverized powder and the surface particles,
At the time of formation of the fixed grains according to 0, the pulverized powder and the surface grains or the fixed grains are stacked on the bottom of the mixing container 14.
The stacked pulverized powder and the surface grains or fixed grains are wound by the hoisting device 30. That is, the scoop 35 rotating via the hoisting motor 31, the rotating shaft 32, the main shaft 33, and the branch shaft 34 winds up the pulverized powder and the surface particles or fixed particles stacked on the bottom of the mixing container 14, and To increase the efficiency of the formation of fixed grains. When the surface grains and the fixed grains are rolled up, the impact tools 20 further fix the surface grains on the surface of the fixed grains, thereby improving the quality of the fixed grains.

The roller device 40, which is rotating simultaneously with the scoop portion 35, is in contact with the bottom surface of the mixing container 14, and the roller rolls. Then, the pulverized particles are sandwiched between the roller device 40 and the bottom surface of the mixing container 14 to be crushed to increase the density, and the fixed particles are formed by fixing the surface particles to the pulverized powder. When the fixed grains are sandwiched between the roller device 40 and the bottom surface of the mixing container 14 and crushed, the fixation of the surface grains is ensured.

The fixed grains are completed in about 20 minutes after the stirring and mixing device 10 is operated. After the fixed grains have been formed, the falling lid 14A provided at the bottom of the mixing vessel 14 is opened, and the fixed grains are dropped down below the mixing vessel 14, thereby collecting the fixed grains very easily. All can be collected in about 30 seconds. Since the fixed granules produced by the stirring and mixing apparatus 10 have undergone the step of increasing the bulk specific gravity by compression, the bulk specific gravity was larger than that of the fixed granules produced without the compression step. Specifically, the fixed grains that have passed through the compression process are:
It was 0.22 g / cc, and the fixed granules not subjected to the compression step were 0.17 g / cc.

As shown in FIG. 1, a woody seed material B5 is formed by mixing a resin and a pigment with the fixed grains manufactured by the above-described manufacturing process. Was closer to the bulk specific gravity of the resin, so that the mixing became easier and the production time of the wood-like formed seed material could be shortened. Further, when the woody seed material B5 is melted and then formed into a desired shape by extrusion molding or injection molding simultaneously with or after the melting, the surface has a pattern very close to the grain of a natural wood, and furthermore, a feeling of touch and the like. Can provide a wood-like product B6 having a texture similar to that of a natural tree.

Next, a second embodiment will be described with reference to FIG. First, the cellulose material A1 is pulverized to obtain a pulverized powder A2. Then, fixed particles A3-2 are formed on the outer peripheral surface of the pulverized powder A2 by fixing surface particles smaller in diameter and harder than the pulverized powder. Next, the fixed grains A3-2 whose bulk specific gravity is increased by compressing the fixed grains A3-2 are obtained. Then, a resinous material and a pigment are mixed with the fixed grains A4 having the increased bulk specific gravity to form a wood-like seed material A5,
The wood-like product A is mixed with a wood-like seed material A5, mixed with a resin base material and melted.
6 is formed.

As a method of “compressing the fixed grains A3-2”, a combination of a conveyor belt and rollers shown in FIG. 3 is employed. In addition, as a method of "compressing the fixed grain A3-2", it goes without saying that a combination of two opposed rollers shown in FIG. 4, a press B3 shown in FIG. 5, and the like can be adopted. The step of fixing the surface particles to the outer peripheral surface of the pulverized powder A2 to form the fixed particles A3-2 is performed by the stirring and mixing device 10 as shown in FIG. This stirring and mixing device 10
The description of the above is omitted because it has been described above.

The fixed grains produced by the stirring and mixing apparatus 10 increase the bulk specific gravity by the compression step. Because it has gone through the process of increasing the bulk specific gravity by this compression,
The bulk specific gravity was larger than that of the fixed granules produced without the compression step. Specifically, the fixed granules that have passed through the compression step have a particle size of 0.1 mm.
22 g / cc, and the fixed granules that have not been subjected to the compression step are:
0.17 g / cc.

As shown in FIG. 2, the woody seed material A5 is formed by mixing a resin and a pigment with the fixed grains manufactured by the above-described manufacturing process. Was closer to the bulk specific gravity of the resin, so that the mixing became easier and the production time of the wood-like formed seed material could be shortened. Further, when the woody seed material A5 is melted and formed into a desired shape by extrusion molding or injection molding after or simultaneously with the melting, the surface has a pattern very close to the grain of a natural wood, and furthermore, a feeling of touch and the like. Can provide a wood-like product A6 having a texture similar to that of a natural tree.

[0053]

According to the first to third and fifth to seventh aspects of the present invention, it is possible to provide a method for producing fixed grains capable of increasing the bulk specific gravity. Further, according to the inventions described in claims 4 and 8, it was possible to provide an apparatus for producing fixed grains capable of increasing the bulk specific gravity.

[Brief description of the drawings]

FIG. 1 is a flow chart showing a first embodiment of a method for producing fixed grains according to the present invention.

FIG. 2 is a flowchart showing a second embodiment of the method for producing fixed grains according to the present invention.

FIG. 3 is a conceptual diagram showing an example of a compression unit according to a fixed grain manufacturing technique according to the present invention.

FIG. 4 is a conceptual diagram showing an example of a compressing unit according to a fixed grain manufacturing technique according to the present invention.

FIG. 5 is a conceptual diagram showing an example of a compressing means according to a fixed grain manufacturing technique according to the present invention.

FIG. 6 is a conceptual diagram showing one embodiment of a part of a fixed grain manufacturing apparatus according to the present invention.

FIG. 7 is a flowchart showing a process until a wood-like molded product described in PCT JP94 / 00351 is formed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Stirring and mixing apparatus 11 Machine base 12 Stirring motor 13 Rotating shaft 13A Transmission gear 13B Horizontal supporting gear 13C Gear shaft 14 Mixing container 14A Falling lid 15 Vertical supporting device 16 Ventilation opening 20 Impact tool 21 Impact motor 22 Rotating shaft 23 Main shaft 24 Agitator 30 Hoisting device 31 Hoisting motor 32 Rotating shaft 33 Main shaft 34 Branch shaft 35 Scoop portion 36 Stir bar 40 Roller device 50 Air injection device 51 Filter 60 Deaerator 61 Suction pump 62 Filter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-64326 (JP, A) JP-A-6-39818 (JP, A) JP-A-62-83029 (JP, A) JP-A-6-83029 256528 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 3/00-3/28 B29B 9/00-9/16

Claims (8)

(57) [Claims] A compressed powder obtained by pulverizing a cellulose material is compressed, and a fixed particle having a smaller diameter and a harder surface than the pulverized powder is fixed to an outer peripheral surface of the compressed powder. A method for producing fixed grains, the method comprising: 2. A mixing container for compressing a pulverized powder obtained by pulverizing a cellulosic material, and mixing, on the outer peripheral surface of the compressed pulverized powder, surface particles smaller in diameter and harder than the pulverized powder. And mixing the crushed powder and the surface particles by rotating the mixing container, and fixing the surface particles to the surface of the crushed powder by impact means for applying an impact force to form fixed particles. A method for producing fixed grains. 3. The mixing means according to claim 1, wherein said rotating means rotates inside said mixing vessel at a higher speed than said mixing vessel in a direction opposite to the rotation direction of said mixing vessel about a rotation axis shifted from the rotation axis of said mixing vessel. 3. The method for producing fixed grains according to claim 2, wherein the method is achieved by an impact tool for forming fixed grains. 4. A machine, a compression device for compressing a crushed powder obtained by crushing a cellulose material, and a rotatable rotary machine with respect to the machine, the compressed crushed powder and a smaller diameter than the crushed powder. And a mixing container capable of storing and mixing the hard surface particles, and a mixing container inside the mixing container in a direction opposite to a rotation direction of the mixing container about a rotation axis that is shifted from a rotation axis of the mixing container. An impact tool for fixing the surface particles to the surface of the pulverized powder by rotating at a higher speed to form fixed particles. 5. The method according to claim 1, wherein a ground powder obtained by crushing the cellulose material and a surface particle smaller in diameter and harder than the ground powder are fixed to form fixed particles, and the fixed particles are compressed. Method for producing fixed grains. 6. A pulverized powder obtained by pulverizing a cellulosic material is housed in a mixing vessel for mixing hard particles having a smaller diameter than the pulverized powder, and the pulverization is performed by rotating the mixing vessel. Mixing the powder and the surface particles, and fixing the surface particles to the surface of the pulverized powder by an impact means for applying an impact force to form fixed particles; and compressing the fixed particles. Production method. 7. The mixing means rotates inside the mixing vessel at a higher speed than the mixing vessel in a direction opposite to the rotation direction of the mixing vessel about a rotation axis shifted from the rotation axis of the mixing vessel. The method for producing fixed grains according to claim 5, wherein the method is achieved by an impact tool for forming fixed grains. 8. A machine stand and rotatable with respect to the machine stand, capable of containing and mixing a crushed powder obtained by crushing a cellulosic material and surface particles smaller in diameter and harder than the crushed powder. On the surface of the pulverized powder by rotating at a higher speed than the mixing container, in a direction opposite to the rotation direction of the mixing container around the rotation axis of the mixing container and the rotation axis of the mixing container inside the mixing container. An apparatus for manufacturing fixed grains, comprising: an impact tool for fixing fixed grains to form fixed grains; and a compression device for compressing the fixed grains.