JPH08182937A - Impact pneumatic pulverizer and production of toner for electrostatic charge image development by using the same - Google Patents

Abstract

PURPOSE: To more effectively pulverize a raw powder material in an impact pneumatic pulverizer for pulverizing the raw powder material by a jet air current by installing an impact surface for repeatedly pulverizing a raw powder material on the side wall of a pulverizing chamber. CONSTITUTION: A material to be pulverized fed from a feeding cylinder of the material 6 reaches a feeding port of the material 5 formed between the inner wall of an accelerating throat part 2 and the outer wall of a high pressure gas jetting nozzle 3. On the other hand, high pressure gas is introduced from a high pressure gas feeding port 7 and passed through a high pressure gas introducing pipe 9 via a high pressure gas chamber 8 and jetted from the high pressure gas jetting nozzle 3. At this time, the material to be pulverized is sucked toward an accelerating pipe outlet 10 together with the coexisting gas and is mixed with the high pressure gas and collides against an impact surface of an impact member 11 in a solid mixed air current state and is pulverized. The pulverized material thus pulverized repeatedly collides against the surface of an impact member 19 installed in a pulverizing chamber side wall 15, and further collision is repeated between the surface of the impact member 11 and the impact wall 19 to pulverize it repeatedly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision type air flow pulverizer for pulverizing a powder raw material which is an object to be pulverized by using a jet air flow (high pressure gas), and an electrostatic charge image developing toner using the pulverizer. It relates to a manufacturing method.

[0002]

2. Description of the Related Art In a collision type air flow crusher using a jet air stream, a powder raw material is conveyed by a jet air stream and ejected from an accelerating pipe outlet, and the powder raw material is provided in front of an accelerating pipe outlet. The powder material is crushed by the impact force of the impact material. The details will be described below based on the conventional collision type airflow crusher using a jet airflow shown in FIG. As shown in FIG. 6, the collision type airflow crusher has an accelerating pipe 2 to which a high pressure gas supply nozzle 22 is connected.
The collision member 25 is provided at a position facing the outlet 24 of No. 3, and by the flow of the high-pressure gas supplied to the acceleration tube 23,
The crushed material supply port 21 connected to the middle of the accelerating pipe 23
The powder raw material sucked into the inside of the accelerating pipe 23 is jetted from the outlet 24 of the accelerating pipe 23 together with the high-pressure gas, collides against the collision surface 26 of the collision member 25, and is crushed by the impact.

However, as described above, in the conventional collision type airflow crusher, the crushed object supply port 21 is communicated with the accelerating pipe 23, so that the following problems occur. That is, the powder raw material sucked and introduced into the acceleration tube 23 is
Immediately after passing through the crushed material supply port 21, the high-pressure gas jet from the high-pressure gas supply nozzle rapidly accelerates dispersion while rapidly changing the flow path toward the accelerating pipe outlet direction. The relatively coarse particles pass through the low flow part of the acceleration tube due to the influence of the inertial force, and the relatively fine particles pass through the high flow part of the acceleration tube, and the powder raw material is sufficiently uniform in the high pressure air flow. The powder raw material is not dispersed in the powder and is separated into a flow having a high concentration of the powder raw material and a flow having a low concentration of the powder raw material.
The collision member is partially concentrated and collides with the collision member, which causes reduction in pulverization efficiency and reduction in processing capacity. Further, the pulverized product crushed by colliding with the collision surface is further crushed by secondary (or tertiary) collision with the inner wall of the crushing chamber, but in the above conventional example, the crushing chamber has a box shape, There is a drawback that efficient secondary collision does not occur and the fine pulverization processing capacity cannot be improved.

On the other hand, the collision surface of the collision member in the conventional crusher, as shown in FIGS. 6 and 7, is in the direction of the mixed air flow of the raw material powder particles on which the material to be crushed is placed, that is, at right angles or inclination to the acceleration tube. (For example, an angle of 45 ° as shown in FIG. 7)
The flat plate is used (Japanese Patent Laid-Open No. 57-
No. 50554 and Japanese Patent Laid-Open No. 58-143853), there are the following drawbacks.

In the case of a crusher having a collision surface 26 perpendicular to the axial direction of the acceleration tube 23 as shown in FIG. 6, the acceleration tube outlet 2
The pulverized material blown out from No. 4 and the pulverized material reflected by the collision surface 26 coexist in the vicinity of the collision surface 26 at a high rate. Therefore, the powder (the pulverized material and the pulverized material in the vicinity of the collision surface 26 is present. )
The concentration is high and the pulverization efficiency is not good. Further, in the crusher as shown in FIG. 7, since the collision surface 26 is inclined with respect to the axial direction of the acceleration tube 23, the powder concentration in the vicinity of the collision surface 26 is smaller than that in the crusher shown in FIG. However, the collision force due to the high pressure air flow is dispersed and decreases. Further, the crushing chamber side wall 28
It cannot be said that the secondary collision with is effectively used. For example, as shown in FIG. 7, when the collision surface 26 has an angle of 45 degrees with respect to the accelerating tube, the above problems are less likely to occur when the thermoplastic resin is crushed, but it is used for crushing when the collision occurs. Since the impact force is small and the crushing by the secondary collision with the side wall 28 of the crushing chamber is small, the crushing ability is reduced to 1/2 to 1 / 1.5 as compared with the crusher of FIG.

As a collision type air flow crusher in which the above problems have been solved, Japanese Utility Model Laid-Open No. 148740/1989 and Japanese Unexamined Patent Publication No.
The one disclosed in Japanese Patent No. 254266 has been proposed. In the former case, as shown in FIGS. 9 and 10, the collision surface 26 of the powder raw material of the collision member is arranged at a right angle to the axis of the accelerating tube, and a conical projection is formed on the collision surface of the powder raw material. It has been proposed to prevent the reflected flow at the collision surface by providing 31. In the latter case, as shown in FIG. 8, the tip portion of the collision surface of the collision member has a specific conical shape to reduce the powder concentration in the vicinity of the collision surface, and the secondary side efficiently with the crushing chamber side wall 28. It has been proposed to have a collision. As described above, by improving the configuration of the crusher, especially the shape of the collision surface, the conventional problems have been considerably improved, but it is still not sufficient, and the recent needs are A pulverized product is desired, and further development of a pulverization method which is excellent in pulverization efficiency and quality of the pulverized product is desired.

On the other hand, the toner or the colored resin powder for toner used in the image forming method by electrophotography usually contains at least a binder resin and a colorant, and in some cases, magnetic powder. The toner having such a composition is
The electrostatic image formed on the latent image carrier is developed, and the formed toner image is transferred to a transfer material such as plain paper or a plastic film. Then, the toner image on the transfer material is fixed on the transfer material by a fixing device such as heat fixing means, pressure roller fixing means, or heat pressure roller fixing means.
Therefore, the binder resin used for the toner has a characteristic of being plastically deformed when heat or pressure is applied.

At present, for example, as a method for producing a toner, first, a mixture containing at least a binder resin and a colorant, and optionally a magnetic powder (and optionally a third component) is melt-kneaded, and then, It is prepared by cooling the obtained melt-kneaded product, pulverizing the cooled product, and classifying the obtained pulverized product. At this time, as a method for pulverizing the cooled material,
Usually, coarse crushing (or medium crushing) by mechanical impact crusher
Then, the obtained coarse pulverized powder is generally finely pulverized by a collision type air flow pulverizer using a jet air flow. In such a case, if the conventional collision type airflow crusher and crushing method as shown in FIG. 6 are used, if the processing capacity is to be further improved, suction is performed at the powder raw material supply port provided in the acceleration tube 23. Shortage occurs, or a fusion substance is generated on the collision surface 26,
There was a problem that stable production could not be performed. Therefore, in order to more efficiently manufacture the toner or the colored resin powder for toner used in the image forming method by electrophotography, a more excellent collision type airflow crusher has been desired.

[0009]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a novel collision type air flow crusher capable of crushing powder raw materials more efficiently. To provide. Another object of the present invention is to solve the above-mentioned problems of the prior art and to provide an efficient toner production method capable of efficiently pulverizing an electrostatic charge image developing toner.

[0010]

The above object can be achieved by the present invention described below. That is, the present invention is provided so as to face an acceleration tube for accelerating the powder raw material by high-pressure gas and an acceleration pipe outlet opening surface for colliding and crushing the powder raw material ejected from the acceleration tube. In a collision type air flow pulverizer having a collision member and a crushing chamber in which the collision member is provided, a side wall of the crushing chamber has a collision surface for multi-crushing the powder raw material. And an electrostatic charge image developing toner manufacturing method using the same.

[0011]

The present inventor, as a result of earnest research to solve the problems of the prior art, when the powder raw material ejected from the accelerating pipe outlet collides with the collision surface of the collision member, The structure is such that the local abrasion of the collision surface can be prevented without reducing the impact force, and the powder material ejected from the acceleration tube outlet and collided with the collision surface of the collision member further collides with the inner wall of the crushing chamber. The present invention has been accomplished by discovering that the powder raw material can be pulverized more efficiently by making the structure capable of effectively performing the multiple collisions.
Further, by using the collision type airflow crusher having the above-mentioned configuration, even when finely pulverizing the binder resin used for the toner having the characteristic of being plastically deformed when heat or pressure is applied, the powder raw material Since the toner can be efficiently pulverized, the production efficiency of the toner for developing an electrostatic charge image can be significantly improved.

[0012]

The preferred embodiments will now be described with reference to the accompanying drawings to explain the present invention in more detail. FIG. 1 shows a schematic cross-sectional view of the collision type airflow crusher of the present invention,
At the same time, it is a diagram showing the flow of the raw material powder in the case of combining the raw material pulverizing step in the case of using the pulverizer and further the classification step of classifying the pulverized pulverized product by the classifier. 2 shows an enlarged cross-sectional view of a portion of the collision type airflow crusher of FIG. 1, and FIG. 3 shows an enlarged cross-sectional view of the accelerating pipe throat portion 2 and the high-pressure gas jet nozzle portion 3 taken along the line AA of FIG. 4 is a cross-sectional view showing the high-pressure gas supply port 7 and the high-pressure gas chamber 8 along the line BB in FIG. 1, and FIG. 5 is the crushing chamber 13 and the collision member 11 along the line C-C in FIG.
It is sectional drawing which shows and.

The collision-type airflow crusher of the present invention shown in FIG. 2 will be described. The crusher faces an accelerating tube 1 for accelerating the object to be crushed by high-pressure gas and an accelerating tube outlet opening surface. And a collision member 11 having a collision surface, and the acceleration tube 1 has a Laval nozzle shape.
The high-pressure gas jet nozzle 3 is arranged upstream of the throat section 2 of
A pulverized material supply port 5 is provided between the outer wall of the high-pressure gas ejection nozzle 3 and the inner wall of the throat portion 2 of the acceleration tube 1, and further,
Grinding chamber 13 connected to the outlet of the acceleration tube 1
Has a circular cross section in the axial direction.

In the collision type airflow crusher of the present invention having the above-mentioned structure, the crushed substance supplied from the crushed substance supply cylinder 6 is an acceleration tube having a Laval nozzle shape with its central axis arranged in the vertical direction. The crushed material supply port 5 is formed between the inner wall of the accelerating tube throat portion 2 and the outer wall of the high-pressure gas jet nozzle 3 whose center is coaxial with the central axis of the accelerating tube 1. On the other hand, the high-pressure gas is introduced from the high-pressure gas supply port 7, passes through the high-pressure gas chamber 8, and passes through one, more preferably a plurality of high-pressure gas introduction pipes 9, and the high-pressure gas ejection nozzle 3
It jets while expanding rapidly toward the acceleration tube outlet 10. At this time, due to the ejector effect generated in the vicinity of the accelerating pipe throat portion 2, the crushed substance is sucked toward the accelerating pipe outlet 10 from the crushed substance supply port 5 while being entrained in the gas coexisting with the crushed substance. In the accelerating tube throat portion 2, the high-pressure gas is uniformly mixed and rapidly accelerated, and the collision surface of the collision member 11 arranged opposite to the accelerating tube outlet 10 is in a state of a uniform solid-gas mixture air flow with no uneven dust concentration. Clash with. The impact force generated at the time of collision is applied to the sufficiently dispersed individual particles (objects to be crushed), so that extremely efficient crushing can be performed.

The crushed material crushed on the collision surface of the collision member 11 further repeatedly collides with the surface of the collision wall 19 having the collision surface installed on the side wall 15 of the crushing chamber to further improve the pulverization efficiency. The collision between the surface of the collision member 11 and the collision wall 19 is repeated to perform multiple pulverization, the pulverization efficiency is further improved, and the pulverized material discharge port 1 disposed behind the collision member 11
It is discharged from 4. Further, as the collision surface of the collision member 11, as shown in FIG.
And an outer peripheral collision surface 17 provided around the protruding central portion. The outer peripheral collision surface 17 has a function of further colliding and crushing the primary pulverized material pulverized in the protruding central portion 16, so that by providing this, the pulverization efficiency can be further improved.

As described above, in the collision type airflow crusher of the present invention, the central axis of the accelerating tube is arranged in the vertical direction, and the material to be crushed is supplied between the inner wall of the accelerating tube 1 and the outer wall of the high pressure gas jet nozzle 3. By making the jetting direction of the high-pressure gas and the feeding direction of the crushed object at the same time at least, the crushed object can be dispersed in the jetted high-pressure airflow in a uniform state without deviation due to the dust concentration. Further, in the collision type airflow crusher of the present invention, the crushed object has a protruding central portion 16 on the collision surface.
Is first crushed on the surface of the crushing chamber, secondly crushed on the outer peripheral collision surface 17, and then crushed on the surface of the collision wall 19 installed on the crushing chamber side wall 15 to be tertiary and quaternary, and further crushing chamber side wall 15 and crushing chamber. Fifth or more crushing is performed between the surface of the collision member 11 and the surface of the collision member 11.

At this time, the apex angle α (°) of the protruding central portion 16 protruding on the collision surface of the collision member 11 and the outer peripheral collision surface 17
Angle β (°) with respect to the vertical plane of the central axis of the acceleration tube 1
However, when the following relationship is satisfied, the pulverization is performed very efficiently, which is preferable. 0 <α <90, β> 0, 30 ≦ α + 2β ≦ 90

That is, when α ≧ 90, it is preferable that the reflected flow of the pulverized material that has been primary pulverized on the surface of the protruding central portion 16 disturbs the flow of the solid-gas mixture flow ejected from the acceleration tube 1. Absent. Further, when β = 0, that is, when the outer peripheral collision surface 17 is perpendicular to the solid-gas mixture flow as shown in FIG. 6, the reflected flow at the outer peripheral collision surface 17 is directed toward the solid-gas mixture flow. Flow in a solid-gas mixture flow, which is not preferable. When β = 0, the powder concentration on the outer peripheral collision surface 17 becomes too large, and when thermoplastic resin powder or powder containing a thermoplastic resin as a main component is used as the raw material, It is not preferable because fused substances and aggregates are likely to be generated and stable operation of the apparatus becomes difficult.

Further, when α and β are α + 2β <30, the impact force of the primary crushing on the surface of the protruding central portion 16 is weakened, so that the crushing efficiency is lowered, which is not preferable. α and β
However, when α + 2β> 90, the reflection flow at the outer peripheral collision portion 17 flows to the downstream side of the solid-gas mixture flow, so that the crushing chamber side wall 15
The impact force of the third pulverization is weakened and the pulverization efficiency is lowered, which is not preferable. Further, when α and β satisfy the following relationship, the collision of the secondary pulverization on the surface of the collision plate and the tertiary pulverization on the side wall of the pulverization chamber are not weakened, and the pulverization efficiency is further improved, which is more preferable. . 10 <α <80 and 5 <β <40

[0020]

EXAMPLES Next, the present invention will be described in more detail with reference to examples. Example 1-Styrene-butyl acrylate-divinylbenzene copolymer (monomer polymerization weight ratio 80.0 / 19.0 / 1.0 Mw, molecular weight 350,000) 100 parts by weight-Magnetic iron oxide (average particle size 0.18 μm) 100 parts by weight Nigrosine 2 parts by weight Low molecular weight ethylene-propylene copolymer 4 parts by weight First, the ingredients of the above formulation were applied to a Henschel mixer FM-7.
Mix well with a 5 type (Mitsui Miike Kakoki Co., Ltd.), then mix 1
Kneading was performed with a twin-screw kneader PCM-30 type (manufactured by Ikegai Tekko KK) set at 50 ° C. The obtained kneaded product was cooled and roughly pulverized to 1 mm or less with a hammer mill to obtain a toner pulverized raw material. The obtained pulverized raw material was pulverized using the collision type airflow pulverizer of the present invention shown in FIG. As the pulverization conditions, first, the pulverized raw material was fed at a constant amount of 51.0 Kg / hr. Is supplied to a forced vortex type classifier at a ratio of 5 to classify, and the classified coarse powder is introduced into a collision type air flow crusher, and the pressure is 0.59M.
Pa (G), 6.0 Nm ³ / min. Was crushed with compressed air. In the present example, after crushing, closed circuit crushing was carried out by circulating the crusher again into the classifier. As a result, a finely pulverized product for toner having a weight average diameter of 8.1 μm was obtained as a classified fine powder product. The above-mentioned pulverization did not generate a fused substance, and could be operated stably.

The particle size distribution of the finely pulverized product or toner obtained above can be measured by various methods, but in the present invention, it was measured using a Coulter counter. That is, as a device, Coulter Counter TA-II or Coulter Multisizer II (manufactured by Coulter) is used. As the electrolytic solution, an approximately 1% NaCl aqueous solution is prepared using primary sodium chloride and used. For example, the brand name ISOTON-II (manufactured by Coulter Scientific Japan Co.) can be used. As a specific measuring method of the particle size distribution, the electrolytic aqueous solution 100 to 1 is used.
First, 0.1 to 5 ml of a surfactant, preferably an alkylbenzene sulfonate, is added as a dispersant to 50 ml, and 2 to 20 mg of a measurement sample is further added thereto. The electrolytic solution in which the sample is suspended is dispersed by an ultrasonic disperser for about 1 to 3 minutes to prepare a sample for measurement. The volume and number of the toner are measured by using the measuring device with a 100 μm aperture as the aperture, and then the volume distribution and the number distribution are calculated. Then, a weight-based weight average particle diameter (D4) (the median value of each channel is set as a representative value for each channel) is obtained from the volume distribution, and a number-based length average particle diameter (D1) is obtained from the number distribution. , And the volume-based coarse powder amount (20.2 μm or more) was obtained, and the number-based fine powder number (6.35 μm or less) was also obtained from the number distribution.

Example 2 The same toner pulverization raw material as in Example 1 was used and pulverization was performed using the collision type air flow pulverizer shown in FIG. The collision type airflow crusher used had the same structure as that used in Example 1. In the case of this embodiment, the crushed raw material is 34 kg /
hr. Is supplied to a forced vortex type classifier at a ratio of 100%, and the classified coarse powder is introduced into a collision type airflow crusher at a pressure of 0.59MP.
a (G), 6.0 Nm ³ / min. Was crushed with compressed air. Then, it was circulated through the classifier again to carry out closed circuit pulverization. As a result, a finely pulverized product for toner having a weight average diameter of 6.0 μm was obtained as classified fine powder. Also in the present example, no stable deposit was generated during pulverization, and stable operation was possible.

Comparative Example 1 The same toner pulverization raw material as in Example 1 was used to pulverize with a conventional collision type air flow pulverizer shown in FIG. The collision type airflow crusher has a plane of collision surface which is perpendicular to the long axis direction of the acceleration tube. The shape of the crushing chamber was a box. First, 18.0 of pulverized raw material was fed with a constant quantity feeder.
Kg / hr. To the forced vortex type classifier, and the classified coarse powder is introduced into the collision type airflow crusher described above, and compressed air with a pressure of 0.59 MPa (G) and 6.0 Nm ³ / min is used. After crushing, it was circulated through the classifier again for closed circuit crushing. As a result, a finely pulverized product for toner having a weight average diameter of 8.3 μm was obtained as classified fine powder. In the case of this comparative example, the supply amount was 18.0 Kg / hr. If the number is larger than the above, the weight average diameter of the obtained fine powder becomes large, and fusion of the pulverized material, agglomerates, and coarse particles start to occur on the collision member, and the fusion material clogs the raw material inlet of the acceleration tube. In some cases, stable driving was not possible.

Comparative Example 2 The same toner pulverization raw material as in Example 1 was used to pulverize using a conventional collision type air flow pulverizer shown in FIG. In the collision type airflow pulverizer, the raw material collision surface of the collision member is at a right angle (β = 0 °) to the axis of the accelerating tube, and the raw material collision surface has an apex angle of 50 ° (α = 50 °). It is provided with a conical projection. The crushing chamber has a box shape. The pulverized raw material was supplied at a constant amount of 22 Kg / hr. Is supplied to the forced vortex type classifier at a ratio of, and the classified coarse powder is introduced into the above-mentioned collision type airflow crusher, and the pressure is 0.59 MPa (G), 6.0 Nm ³ /
After crushing with compressed air of min, it was circulated through the classifier again to carry out closed circuit crushing. As a result, a finely pulverized product for toner having a weight average diameter of 8.2 μm was obtained as classified fine powder. In the case of this comparative example, the supply amount was 22 Kg / hr. The weight average diameter of the fine powder obtained was increased when the amount was increased.
Although no generation of a coarse fusion product was observed, when the collision member was inspected after operating for 1 hour, it was confirmed that a layer of the fusion product of the pulverized material was slightly attached to the raw material collision surface. .

Comparative Example 3 The same toner pulverization raw material as in Example 1 was used to pulverize with a conventional collision type air flow pulverizer shown in FIG. The structure of the collision type airflow crusher is the same as that used in Comparative Example 1.
The pulverized raw material was supplied at a constant amount of 8.0 kg / hr. Is supplied to a forced vortex type classifier at a ratio of, and the classified coarse powder is introduced into the above collision type airflow crusher, and the pressure is 0.59 MPa.
(G), 6.0 Nm ³ / min. After being crushed using compressed air of No. 1, it was circulated through the classifier again to carry out closed circuit crushing.
As a result, as a classified fine powder, the weight average diameter was 6.4 μm.
A finely pulverized product for toner of m was obtained. In the case of this comparative example, the supply amount was 8.0 Kg / hr. If the amount is larger than the above, the weight average diameter of the fine powder obtained becomes large, and fusion of the pulverized material, agglomerates, and coarse particles start to occur on the collision member, and the fusion material clogs the raw material inlet of the acceleration tube. In some cases, stable driving was not possible.

[0026]

According to the present invention, the object to be crushed, which is the solid-gas mixture flow injected from the accelerating tube, is sufficiently dispersed, crushed on the collision surface of the collision member, and further installed on the side wall of the crushing chamber. Since the collision is repeated on the surface of the collision wall having the collision surface to perform multi-stage crushing, a collision type airflow crusher having significantly improved crushing efficiency as compared with the conventional collision crusher is provided. Further, in the collision type airflow crusher provided by the present invention, since the reflected flow after the collision does not flow toward the acceleration tube, it is possible to prevent the turbulence of the solid-gas mixture flow, and to prevent the fusion material on the collision surface. Is effectively prevented. Further, when the toner for developing an electrostatic charge image is manufactured by the method of the present invention, since the excellent collision type airflow crusher as described above is used, a toner having a characteristic of being plastically deformed when heat or pressure is applied is obtained. Even when the binder resin used is finely pulverized, the powder raw material can be pulverized more efficiently, so that the production efficiency of the toner for developing an electrostatic charge image is significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a collision-type airflow crusher of the present invention.

FIG. 2 is an enlarged sectional view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a schematic cross-sectional view showing a conventional collision type airflow crusher.

FIG. 7 is a schematic cross-sectional view showing another conventional collision type airflow crusher.

FIG. 8 is a schematic cross-sectional view showing another conventional collision type airflow crusher.

FIG. 9 is a schematic cross-sectional view showing another conventional collision type airflow crusher.

FIG. 10 is a schematic cross-sectional view showing an example of a collision surface shape used in the collision type airflow crusher of FIG.

[Explanation of symbols]

 1, 23: Acceleration tube 2: Acceleration tube throat part 3: High-pressure gas jet nozzle 4: High-pressure gas jet nozzle throat part 5: Ground material supply port 6: Ground material supply cylinder 7: High pressure gas supply port 8: High pressure gas Chamber 9: High-pressure gas introduction pipe 10, 24: Accelerator pipe outlet 11, 25: Collision member 12: Collision member support 13, 30: Crushing chamber 14, 27: Crushed material discharge port 15, 28: Crushing chamber side wall 16: Projection Central part 17: Peripheral collision surface 18, 29: Powder raw material 19: Grinding chamber collision wall 21: Ground material supply port 22: High pressure gas supply nozzle 26: Collision surface 31: Projection

Claims (2)

[Claims] 1. An accelerating pipe for accelerating the powder raw material by high-pressure gas and an accelerating pipe outlet opening surface for colliding and crushing the powder raw material ejected from the accelerating pipe. In a collision type air flow pulverizer having a collision member and a crushing chamber in which the collision member is provided, a side wall of the crushing chamber has a collision surface for multi-crushing the powder raw material. Collision type airflow crusher. 2. A mixture containing at least a binder resin and a colorant is melt-kneaded to form a kneaded product, and the kneaded product is cooled and solidified, and the solidified product obtained is pulverized into a pulverized product. In a toner manufacturing method for producing a toner for developing an electrostatic charge image using the obtained finely pulverized product, the pulverized product is further pulverized with a collision type air flow pulverizer. A method for producing a toner for developing an electrostatic charge image, which comprises further pulverizing using a pulverizer.