JP2002253983A - Production process of powder product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder product production process by which the production efficiency of a powder product can be improved while conserving the environment. SOLUTION: This production process of a powder product which has a particle size distribution within a prescribed particle size range and is fused by heating, comprises: a kneading stage (#30) for kneading a raw material while fusing it; a cooling stage (#40) for cooling and solidifying the resulting kneaded material from the kneading stage (#30); a crushing stage (#50) for crushing the resulting solid material from the cooling stage (#40); and a combination stage (#60) for subjecting a fine powder having particle size smaller than a prescribed lower limit particle size and the other powder having particle size equal to or larger than the lower limit particle size, both contained in the resulting crushed material from the crushing stage (#50), to fusion/combination into a combined powder consisting of combined particles.

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 a powder product (for example, an electrophotographic toner or a powder coating used in a copying machine or the like) which is distributed within a predetermined particle size range and melted by heating. is there.

[0002]

2. Description of the Related Art A conventional method for producing a toner for electrophotography is as follows.
As shown in FIG. 11, a measuring step (# 210) in which raw materials such as a binder resin, a coloring agent, an anti-offset agent, and a charge controlling agent are respectively measured by a predetermined amount, and a mixing step (# 220) in which these raw materials are mixed by a mixer. ), A kneading step (# 230) of kneading the mixture obtained in this step while melting it with a twin-screw extruder or the like, and a cooling step (# 240) of cooling and solidifying the kneaded product obtained in this step. And the solid obtained in this step is roughly pulverized to a size of about 1 mm by a hammer mill or the like, and then 10 μm by a jet mill or the like.
It comprises a pulverizing step (# 250) of finely pulverizing back and forth, and a classification step (# 260) of classifying the pulverized product obtained in this step to particle size and removing fine powder having a particle size smaller than the lower limit particle size. The fine powder removed in the classification step (# 260) is mixed in the mixing step (# 220).
Alternatively, it is returned to the kneading step (# 230) and is used again as a raw material.

[0003]

In the conventional manufacturing method as described above, the heat treatment is performed until the fine powder generated in the classifying step is again melted into a liquid state in the kneading step. Indeed, the characteristics related to image quality deteriorate,
It becomes difficult to obtain desired product quality. Therefore, the fine powder having a heating history of three or more times must be discarded, and a large amount of waste is generated, which is not environmentally desirable and causes a reduction in production efficiency.

[0004] Further, when classifying and removing fine powder, it is difficult to accurately classify the fine particles at the lower limit particle size. Therefore, the fine particles are classified at a particle size slightly higher than the lower limit particle size. Is also included. In recent years, the demand for color toners having a small particle size has been increasing, and as the particle size becomes smaller, the lower limit particle size becomes smaller and accurate classification becomes difficult.
Such a loss has increased, causing a reduction in production efficiency.

Incidentally, such a problem is not limited to the toner, but also exists in other powder products manufactured by the same method.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a method of manufacturing a powder product which improves production efficiency and protects the environment. It is.

[0007]

In order to achieve the above-mentioned object, an invention according to claim 1 is a method for producing a powder product which is distributed within a predetermined particle size range and which is melted by heating. A kneading step of kneading while melting, a cooling step of cooling and solidifying the kneaded material obtained in the step, a pulverizing step of pulverizing the solid obtained in the step, and a pulverized material obtained in the step. And a composite step of fusing and integrating a fine powder having a particle size smaller than the lower limit particle size and a powder having a particle size equal to or larger than the lower limit particle size.

The invention according to claim 2 is a method for producing a powdery product which is distributed within a predetermined particle size range and is melted by heating, wherein a kneading step of kneading while melting the raw material, A cooling step of cooling and solidifying the obtained kneaded product, a pulverizing step of pulverizing the solid obtained in the step, and a classification of removing the fine powder having a particle size smaller than the lower limit particle size by classifying the pulverized product obtained in the step to particle size A method for producing a powder product, comprising: a step; and a compounding step of fusing and integrating the fine powders obtained in the step.

According to a third aspect of the present invention, in the method for manufacturing a powder product according to the first or second aspect, the apparatus for performing the compounding step applies mechanical energy or fluid energy to the powder particles. It is characterized in that it is configured to fuse powder particles.

According to a fourth aspect of the present invention, in the method for manufacturing a powder product according to the first or second aspect, the apparatus for performing the compounding step is rotatable around a rotation axis, and A tubular body having a receiving surface to be pressed on an inner peripheral portion,
A pressing head disposed inside the cylindrical body so as to be close to the receiving surface, and relatively rotating the cylindrical body and the pressing head, thereby performing processing between the receiving surface and the pressing head. It is characterized in that it is configured to apply a pressing force and a shearing force to an object.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing the outline of the method for manufacturing a powder product according to the first embodiment of the present invention. # 10 to # 5 of the manufacturing method of the present embodiment
0 is the same as # 210 to # 250 of the prior art. That is, in the measuring step (# 10), a plurality of raw materials are each measured by a predetermined amount, and these raw materials are mixed (# 2).
Mix in 0) with a mixer. Next, in the kneading step (# 30), the obtained mixture is kneaded while being melted by a twin screw extruder or the like, and the obtained kneaded substance is cooled and solidified in the cooling step (# 40). Then, in the grinding step (# 50), the obtained solid is roughly pulverized to a size of about 1 mm using a hammer mill or the like, and then finely pulverized to about 10 μm using a jet mill or the like.

As a jet mill for performing fine pulverization in the pulverization step, for example, the one shown in FIGS. 2 and 3 can be used. In the jet mill shown in FIG. 2, the raw material supplied into the pulverizing chamber 202 through the raw material supply pipe 201 is
The particles are accelerated by a jet stream jetting from a plurality of nozzles 203 attached to the side surface of the body toward one point in the machine, and are crushed by collision of particles. Then, the crushed raw material rides on the rising airflow,
4 classifies powder having a particle size equal to or less than the upper limit particle size,
5 is discharged. In addition, coarse powder exceeding the upper limit particle size falls and is reground.

The jet mill shown in FIG. 3 is a modification of the jet mill shown in FIG. 2, in which a plurality of nozzles 203 mounted on the side of the fuselage are all directed obliquely downward, and the nozzle 203 is provided on the lower surface of the fuselage. It is mounted vertically so that the jet airflows ejected from the nozzles 203 collide at one point and the velocity vectors of the airflows cancel each other. Other configurations are substantially the same as those in FIG. This jet mill is applied to powders that are difficult to fluidize with the jet mill of FIG.

Also, instead of the jet mill shown in FIGS.
Fine pulverization may be performed using a mechanical pulverizer as shown in FIG. In this pulverizer, a raw material supplied into the machine through a raw material supply pipe 301 is pulverized between a blade rotor 302 rotating at a high speed and a liner 303 around the blade rotor 302, and the pulverized raw material passes through an air supply pipe 304. The air is supplied to the classification rotor 305 by the air flow supplied thereto, so that powder having a particle size equal to or less than the upper limit particle size is discharged to the outside via the discharge pipe 306, and coarse powder having a particle size exceeding the upper limit particle size returns to the pulverizing section and is re-pulverized. It has become.

[0015] Medium pulverization may be performed between fine pulverization and coarse pulverization. In such a case, the amount of coarse powder to be classified and removed at the time of fine pulverization is reduced, and production efficiency is improved. FIG. 5 shows an example of a mechanical crusher used in such a case. In this pulverizer, a raw material supplied into the machine via a raw material supply pipe 401 is pulverized between a blade rotor 402 rotating at high speed and a liner 403 around the blade rotor 402, and the pulverized raw material passes through an air supply pipe 404. The air is supplied to the classification rotor 405 by the air flow supplied thereto, and the powder having a particle size equal to or less than the upper limit particle size is discharged to the outside via the discharge pipe 406, and the coarse powder having the particle size exceeding the upper limit particle size returns to the pulverizing section and is re-pulverized. It has become.

In this embodiment, the grinding step (# 5)
0), a compounding step (#) of fusing and integrating a fine powder having a particle size smaller than the lower limit particle and a powder having a particle size larger than the lower limit particle contained in the pulverized material
60) and a classification step (# 70) of classifying the powder treated in this step to remove coarse particles exceeding the upper limit particle size;
And a classification step (# 80) of classifying the powder treated in this step to remove fine powder having a particle size smaller than the lower limit particle size.

The compounding step is performed using, for example, a powder processing apparatus as shown in FIG. This device is rotatable about a rotation axis X along the vertical direction, and has a cylindrical body 3 having a receiving surface 6 on its inner peripheral portion against which the object 4 is pressed,
A pressing head 5 disposed inside the cylindrical body 3 so as to be close to the receiving surface 6, and rotating the cylindrical body 3 to relatively rotate the receiving surface 6 and the pressing head 5, It is configured to apply a pressing force and a shearing force to the workpiece 4 in the pressing portion 7 between the pressing head 5 and the pressing head 5.

More specifically, a substantially cylindrical casing 2 is installed on a base 1 via a support member 8, and a tubular body 3 is provided inside the casing. The casing 2 includes a casing body 2a and a lid member 2b, and a processing space 9 is formed therein. The lid member 2b is detachable from the casing main body 2a, and has a workpiece input port 10 and an exhaust port 11 with a filter. A workpiece outlet 12 for removing the processed workpiece 4 is formed at a part of the bottom peripheral edge of the casing body 2a.

Around processing space 9 around casing 2
Is provided with a jacket 13 for adjusting the temperature.
A heating medium or a cooling medium from a separately provided tank (not shown) is circulated and supplied to the jacket 13 as needed. Of course, when it is not necessary to actively control the internal temperature of the casing 2, the supply of the heating medium or the like is not performed.

The cylindrical body 3 has a substantially cylindrical shape and is rotatable around a vertical rotation axis X.
, A bottom portion 15 connected thereto, and a cylindrical wall portion 16 connected thereto. The rotating shaft 14 is rotatably attached to the base 1 via a bearing 17. The driving force is transmitted to the pulley 19b of the rotating shaft portion 14 by the motor 18 attached to the base 1 and the driving belt 19a connected thereto, and the cylindrical body 3 is rotationally driven. Cylindrical body 3
Is rotated to apply a centrifugal force to the object 4 to be processed.
The workpiece 4 is pressed against the receiving surface 6 of the tubular body 3.

The bottom portion 15 includes a rotating shaft portion 14 and a cylindrical wall portion 16.
In addition to the function of linking the object 14, it functions as a means for holding the object 14. That is, the bottom portion 15 has a relationship in which the surfaces thereof are bent in relation to a cylindrical wall portion 16 described later, and when the cylindrical body 3 rotates, the object 4 is not sufficiently processed and the pressing portion 7 is not processed. To escape from below.

The inner peripheral surface of the cylindrical wall portion 16 becomes the receiving surface 6 of the object 4 to be moved outward by centrifugal force. That is, the workpiece 4 is held on the pressing portion 7, and the powder processing is performed by applying a pressing force and a shearing force to the workpiece 4 in cooperation with the receiving surface 6 and the pressing head 5.

The cylindrical wall 16 is provided with a hole 20. The hole 20 is formed in the receiving surface 6, that is, the cylindrical wall 1.
6 are provided at a position symmetrical with respect to the rotation axis X of the cylindrical wall portion 16. The hole 20 is provided with the pressing portion 7.
This is for excluding a part of the processing object 4 held in the outside of the pressing portion 7.

The pressing head 5 is arranged inside the cylindrical body 3 at a predetermined interval from the receiving surface 6. The pressing head 5 is fixed to a vertical fixed shaft 22 provided so as to be coaxial with the rotation axis of the cylindrical body 3. The pressing head 5 applies a pressing force and a shearing force to the workpiece 4 in cooperation with the receiving surface 6. Therefore, the horizontal plane shape of the pressing head 5 is formed in a semicircular shape, for example, as shown in FIG. According to this configuration, an effect of consolidating the object 4 to be intruded between the pressing head 5 and the receiving surface 6 can be expected, which is advantageous for compounding and spheroidizing the powder.

The pressing head 5 may be fixed similarly to the casing 2, or may be configured to rotate the vertical fixing shaft 22 by using any driving means, and to positively rotate the shaft 22 relative to the receiving surface 6. It may be. That is, by appropriately setting the rotation direction or the rotation speed of the pressing head 5, the relative rotation speed between the pressing head 5 and the receiving surface 6 can be set more finely, and the optimum processing conditions according to the workpiece 4 can be set. Can be set. The pressing head 5 is extendable and contractible in the radial direction of the tubular body 3 so that the distance between the pressing head 5 and the receiving surface 6 can be adjusted.

Although not shown, the temperature of the pressing head 5 is controlled via the vertical fixed shaft 22 irrespective of whether the vertical fixed shaft 22 is fixed or rotatable. You can also. For example, although illustration is omitted, if a heat medium passage is secured inside the vertical fixed shaft 22 and the pressing head 5, it is easy to set the optimum processing conditions according to the thermal characteristics of the processing object 4. Become.

At the lower part of the outer periphery of the casing 2, a blade member 2 is provided.
3 is provided. A plurality of the blade members 23 are provided along the circumferential direction of the tubular body 3, but the number thereof is arbitrary. The blade member 23 is for recirculating the object 4 removed from the hole 20 to the outside of the cylindrical body 3 to the pressing portion 7 again. The blade member 23 is formed so as to conform to the inner surface shape of the casing 2 in order to smoothly and surely convey the workpiece 4 to the pressing portion 7.

According to the powder processing apparatus having such a configuration,
The object 4 is pressed against the receiving surface 6 of the cylindrical body 3 by centrifugal force, and undergoes an assembling action to generate a layer of the object 4 in a consolidated state on the receiving surface 6. On the other hand, a part of the compacted processing object 4 is connected to the cylindrical body 3 through the hole 20.
The object 4 to be processed, which is excluded outside the inside and is present inside the cylindrical body 3, is subjected to a certain degree of agitation by the pressing head 5. That is, compounding and mixing of the object to be processed 4 can be promptly advanced.

This apparatus adjusts the relative rotation speed between the pressing head 5 and the receiving surface 6 and the distance between the pressing head 5 and the receiving surface 6 to adjust the relative fineness of the fine particles less than the lower limit particle size contained in the workpiece 4. And a powder having a particle size not less than the lower limit particle size can be increased. The processed object 4 is subjected to the classification process (# 7
0) and (# 80) are classified into particles, and powder within a predetermined particle size range is obtained as a product.

In the classification steps (# 70) and (# 80), for example, a classifier as shown in FIGS. 8 and 9 can be used. In the classifier shown in FIG. 8, the raw material and the primary air are supplied into the machine via a raw material supply pipe 501, and the raw material is supplied to the fluidizing chamber 50.
The particles are agitated and dispersed in 2 to disperse the agglomerates and become single particles. Then, the powder having a particle size equal to or less than the upper limit particle size flows into the classification chamber 503 by the ascending airflow, and only the powder having a predetermined particle size is classified and sorted by the classification rotor 504.
Is discharged out of the machine. On the other hand, coarse powder exceeding the upper limit particle size descends along the wall surface, is stored in the lower part inside the machine, and is discharged outside the machine via the rotary valve 506. In addition, 5
Reference numeral 07 denotes a secondary air supply pipe, and reference numeral 508 denotes a motor for rotating the classification rotor 504.

In the classifier shown in FIG. 9, air supplied to the classifying air chamber 616 through the classifying air supply pipe 619 is jetted into the classifying space 612 through the gap formed in the guide blade ring 605. Then, it flows into the rotating classifying rotor 602 through a gap formed in the classifying blade ring 608. On the other hand, the powder supplied through the raw material supply port 615 is dispersed in the entire circumferential direction by the distribution disk 606 of the classification rotor 602 and flows into the classification space 612. Classification space 61
While the powder that has flowed into 2 falls in the classification space 612, the powder having a particle size equal to or less than the upper limit particle size flows into the classification rotor 602 on the classification air flow, and is deflected axially downward with the classification air flow. Through hole 6 formed in cover disk 607
10, flows into the classifying rotor support member 604 through the gap formed in the interval web 625, and is discharged through the discharge chamber 617.
Flow inside. Then, the powder is discharged to the outside via the discharge pipe 620. On the other hand, the coarse powder exceeding the upper limit particle size does not get on the classification airflow in the classification space 612, descends in the classification space 612 by gravity, and is received by the discharge chamber 618. Then, the coarse powder is discharged to the outside via the discharge pipe 621.

Reference numeral 601 denotes a casing; 603, a drive shaft for rotating the classifying rotor 602 via the classifying rotor support member 604; 627, a spiral shape for controlling the residence time and agglomeration of the objects to be classified in the classifying space 612. A spiral member 628 which rotates together with the classification rotor 602 to fluidize the powder in the discharge chamber 618; and 629 which introduces cleaning air into the gap between the casing 601 and the classification rotor 602. Air passages for 630
Reference numeral denotes a holding ring for preventing coarse powder in the coarse powder discharge chamber 618 from flowing back into the classification space 612.

The coarse powder removed in the classification step (# 70) is returned to the pulverization step (# 50) and re-pulverized.
The fine powder removed in 80) is returned to the compounding step (# 60). In addition, when the ratio of the coarse powder and the fine powder contained in the object to be processed processed in the compounding step (# 60) is low, the classification steps (# 70) and (# 80) can be omitted.

As described above, according to the manufacturing method of this embodiment,
The fine powder generated in the pulverizing step (# 50) is fused and integrated with powder having a particle size equal to or more than the lower limit particle size and recycled.
Since the fine powder is not melted again into a liquid state, the characteristics affecting the image are not easily reduced. Therefore, the amount of waste is reduced, production efficiency is improved, and the environment is also favorable. In addition, by performing the compounding process, the ratio of powder having a small particle size is reduced, and the amount of fine powder that is classified and removed after the compounding process and the amount of products contained therein are reduced, thereby improving production efficiency. I do. Further, the ratio of powder having a small particle diameter contained in the product is reduced, and the particle size range of the product is narrowed, so that the quality is improved.

Next, a second embodiment of the present invention will be described. FIG. 10 is a flowchart showing the outline of the method for manufacturing a powder product according to the second embodiment of the present invention. Note that, in this embodiment, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the raw material pulverized in the pulverizing step (# 50) is classified in a classifying step (# 90) to remove fine particles having a particle size smaller than the lower limit. A composite treatment is performed to fuse the powders with each other, and the powder obtained in this step is subjected to particle size classification in a classification step (# 110) to remove coarse powder exceeding the upper limit particle size, and the powder obtained in this step is classified. In the step (# 120), the particle size is classified to remove the fine powder smaller than the lower limit particle size.

In the compounding step (# 100), the first
The same powder processing apparatus as in the compounding step (# 60) of the embodiment is used, and the classifying steps (# 90, # 110, # 12) are used.
In 0), the same classifier as in the classifying step (# 70) of the first embodiment is used.

The coarse powder removed in the classification step (# 110) is returned to the pulverizing step (# 50), and the fine powder removed in the classification step (# 120) is returned to the compounding step (# 100).
In the present embodiment, if the amount of fine powder contained in the processing object obtained in the classification step (# 110) is small, the classification step (# 120) may be omitted. Further, when the ratio of the coarse powder and the fine powder contained in the object 4 treated in the compounding step (# 100) is low, the classification step (# 90,
# 110, # 120) can also be omitted.

In the manufacturing method of this embodiment, the fine powder generated in the pulverizing step (# 50) is fused and recycled, and unlike the conventional method, the fine powder is not melted again into a liquid state. Characteristics affecting the image are unlikely to decrease. Therefore, the amount of waste is reduced, production efficiency is improved, and the environment is also favorable. In addition, by performing the compounding process, the ratio of powder having a small particle size decreases,
The amount of fine powder to be classified and removed after the complexing step and the amount of the product contained therein are reduced, and the production efficiency is improved. further,
Since the ratio of powder having a small particle size contained in the product is reduced and the particle size range of the product is narrowed, the quality is improved.

In the above-described embodiment, the cylindrical member which is rotatable about the rotation axis along the vertical direction and has a receiving surface on its inner peripheral portion against which the object to be processed is pressed, A pressing head disposed inside the cylindrical body so as to be close to the receiving surface, and the cylindrical body and the pressing head are relatively rotated, so that the workpiece to be processed between the receiving surface of the cylindrical body and the pressing head is The compounding is performed by a powder processing device configured to apply a pressing force and a shearing force, but has a tubular body rotatable around a rotation axis along a horizontal direction, and The compounding may be performed by the powder processing apparatus configured as described above.

Further, instead of the composite apparatus having such a configuration, another composite apparatus may be used. For example, mechanical energy or fluid energy may be applied to the powder particles by a pulverizer, a mixer, a stirrer, or the like, and the powder particles may be fused by an impact force or a compressive force generated at that time.

For example, the raw material input port and the raw material discharge port of the crusher are connected by a pipe to circulate the powder particles, and the powder particles are separated by an impact force repeatedly applied in the crusher and a rise in the internal temperature. In the jet mill, the powder particles are circulated inside the jet mill so that the powder particles repeatedly collide with each other, and when the temperature inside the jet mill rises, the powder particles are fused together. Then, the powder particles may be stirred together, and the powder particles may be fused with each other by increasing the internal temperature in addition to the pressing force and the shearing force in the mixer. In addition, the temperature may be raised naturally by circulating or stirring the powder particles,
The temperature may be forcibly increased by a heating means such as a heater.

The present invention is not limited to a method for producing a toner, but can be applied to a method for producing a powder coating or other powder products.

In addition, various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

[0045]

As described above, according to the first aspect of the present invention, fine powder having a particle size smaller than the lower limit particle generated in the pulverizing step is fused with powder having a particle size equal to or larger than the lower limit particle for recycling. As described above, the fine powder is not melted again into a liquid state, and the quality is hardly deteriorated. Therefore, the amount of waste is reduced, which is environmentally friendly and production efficiency is improved. In addition, by performing the compounding process, the ratio of powder having a small particle size is reduced, and the amount of fine powder that is classified and removed after the compounding process and the amount of products contained therein are reduced, thereby improving production efficiency. I do. Furthermore, since the ratio of powder having a small particle size contained in the product is reduced and the particle size range of the product is narrowed,
Quality is improved.

According to the second aspect of the present invention, the fine powder having a particle size smaller than the lower limit particle size generated in the pulverizing step is fused and recycled, so that the fine powder is melted again into a liquid state as in the prior art. There is no problem and the quality is not easily reduced. Therefore, the amount of powder to be discarded is reduced, which is environmentally favorable and improves production efficiency. In addition, by performing the compounding process, the ratio of powder having a small particle size decreases,
The amount of fine powder to be classified and removed after the complexing step and the amount of the product contained therein are reduced, and the production efficiency is improved. further,
Since the ratio of powder having a small particle size contained in the product is reduced and the particle size range of the product is narrowed, the quality is improved.

[Brief description of the drawings]

FIG. 1 is a flowchart schematically showing a method for manufacturing a powder product according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a jet mill used in a pulverizing step of the embodiment.

FIG. 3 is a partially broken perspective view of a jet mill used in a pulverizing step of the embodiment.

FIG. 4 is a longitudinal sectional view of a mechanical crusher used in a crushing step of the embodiment.

FIG. 5 is a longitudinal sectional view of a mechanical crusher used in a crushing step of the embodiment.

FIG. 6 is a vertical cross-sectional view of a powder processing apparatus used in the compounding step of the embodiment.

FIG. 7 is a cross-sectional view of a main part of the powder processing apparatus of FIG. 6;

FIG. 8 is a longitudinal sectional view of a classifier used in a classifying step of the embodiment.

FIG. 9 is a longitudinal sectional view of a classifier used in a classifying step of the embodiment.

FIG. 10 is a flowchart schematically illustrating a method for manufacturing a powder product according to a second embodiment of the present invention.

FIG. 11 is a flowchart showing an outline of a conventional method for producing a powder product.

[Explanation of symbols]

 # 10 Measuring process # 20 Mixing process # 30 Kneading process # 40 Cooling process # 50 Pulverizing process # 60 Composite process

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B07B 7/083 B07B 7/083 // B29B 13/10 B29B 13/10 G03G 9/087 G03G 9/08 381 (72) Inventor Kazuki Suhara 2-5-114 Kawaramachi, Chuo-ku, Osaka City Inside Hosokawa Wakmicron Co., Ltd. ) Inventor Masahiro Inoki 2-5-114 Kawaramachi, Chuo-ku, Osaka-shi Inside Hosokawa Wakmicron Co., Ltd. 2H005 AB04 4D021 FA23 GA02 GA08 HA01 HA10 4D067 DD03 DD09 EE22 EE35 EE50 GA20 GB05 4F201 BA04 BN30 BN32 BQ04 BQ05 BQ21 BQ44 4G004 FA03

Claims (4)

[Claims] 1. A method for producing a powdery product that is distributed within a predetermined particle size range and melted by heating, comprising: a kneading step of kneading while melting a raw material; and cooling and solidifying the kneaded material obtained in the step. Cooling step, a pulverizing step of pulverizing the solid obtained in the step, and fusing and integrating a fine powder having a particle size less than a lower limit particle size and a powder having a lower limit particle size or more contained in the pulverized product obtained in the step. A method for producing a powder product, comprising: a compounding step. 2. A method for producing a powder product which is distributed within a predetermined particle size range and is melted by heating, comprising: a kneading step of kneading while melting a raw material; and cooling and solidifying the kneaded material obtained in the step. Cooling step, a pulverizing step of pulverizing the solid obtained in the step, a classifying step of classifying the pulverized product obtained in the step to remove fine powder having a particle size smaller than the lower limit particle size, A compounding process for fusing and integrating the fine powders,
A method for producing a powder product, comprising: 3. An apparatus for performing the compounding step, wherein the apparatus is configured to apply mechanical energy or fluid energy to the powder particles to fuse the powder particles with each other. Item 3. The method for producing a powder product according to item 1 or 2. 4. An apparatus for performing the compounding step, wherein the apparatus is rotatable around a rotation axis and has a receiving surface on an inner peripheral portion on which an object to be processed is pressed, and a device which is close to the receiving surface. And a pressing head disposed inside the cylindrical body so as to relatively rotate the cylindrical body and the pressing head,
The method for producing a powder product according to claim 1, wherein a pressing force and a shearing force are applied to an object to be processed between the receiving surface and the pressing head. 4.