JPH08117633A - Production of impact pneumatic pulverizer and static charge developing toner - Google Patents

Abstract

PURPOSE: To improve pulverizing efficiency by introducing a material to be pulverized into an accelerating pipe to form a solid-gas mixed flow, jetting it from the outlet of the accelerating tube toward an impact member to make it collide with a spherical impact surface provided on the impact member before further making it collide with the side wall of a pulverizing chamber. CONSTITUTION: A material to be pulverized fed from a material feeding cylinder 25 reaches a material feeding port 24 formed between the inner wall of a throat part 22 of an accelerating pipe 21 and the outer wall of a high pressure gas jetting nozzle 23. High pressure gas is introduced from a gas feeding port 26 into a gas chamber 27 and passed through a gas introducing pipe 28 and jetted from the gas jetting nozzle 23 toward an accelerating pipe outlet 29 while rapidly expanded. At this time, by ejector effect generated near the throat part 22, the material to be pulverized is sucked while entrained by air, and after it is accelerated, it collides with the spherical impact surface of an impact member 30, thereby it is pulverized and dispersed and further collides with a pulverizer chamber side wall 32 and is further pulverized.

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 using a jet air flow (high pressure gas) and a method for producing a toner for developing an electrostatic charge image using the pulverizer. .

[0002]

2. Description of the Related Art A collision type air flow crusher using a jet air flow puts a powder raw material on the jet air flow to form a particle mixed air flow and jets it from an outlet of an accelerating pipe. The crushing raw material is crushed by the collision force of the collision member provided and colliding with the collision surface.

The details will be described below based on the conventional collision type airflow crusher shown in FIG. The conventional collision type airflow crusher has an outlet 1 of an accelerating pipe 3 to which a high pressure gas supply nozzle 2 is connected.
3, a collision member 4 is provided so that the high pressure gas supplied to the accelerating pipe 3 sucks the crushed substance into the accelerating pipe 3 from the crushed substance supply port 1 communicating with the middle of the accelerating pipe 3. Then
This is jetted together with the high-pressure gas to collide with the collision surface of the collision member 4, and is crushed by the impact.

Conventionally, the collision surface 14 of the collision member in such a crusher is, as shown in FIGS. 6 and 7, perpendicular or inclined (in the axial direction of the accelerating tube) with respect to the direction of the jet air flow on which the powder material is placed. For example, a flat surface having an angle of 45 ° has been used (JP-A-57-50554 and JP-A-58).
-143853).

In the pulverizer shown in FIG. 6, the powder raw material having a coarse particle size is supplied to the accelerating pipe 3 through the charging port 1 and jetted from the jet nozzle 2 so that the powder raw material collides with the collision member 4. It is struck on the surface 14, crushed by its impact force, and discharged from the discharge port 5 to the outside of the crushing chamber. However, when the collision surface 14 is perpendicular to the axial direction of the accelerating tube 3, the ratio of the raw material powder blown out from the jet nozzle 2 and the powder reflected by the collision surface 14 coexisting in the vicinity of the collision surface 14 is high. Therefore, the pulverization efficiency is not good because the powder concentration near the collision surface 14 becomes high.

Further, in the above-mentioned crushing device, the primary collision on the collision surface 14 is the main component, and it cannot be said that the secondary collision with the crushing chamber wall 6 is effectively utilized. Further, in a crusher whose collision surface angle is perpendicular to the accelerating pipe 3, when crushing the thermoplastic resin, fusion and agglomerates are likely to occur due to local heat generation of the collision member, and stable operation of the device is difficult. And causes a decrease in crushing ability. Therefore, it was difficult to use the powder with a high powder concentration.

In the crusher shown in FIG. 7, since the collision surface 14 is inclined and inclined in the axial direction of the acceleration tube 3, the powder concentration in the vicinity of the collision surface 14 is lower than that in the crusher shown in FIG. However, the crushing pressure is dispersed and decreases. Further, it cannot be said that the secondary collision of the crushing chamber 6 is effectively used.

As shown in FIG. 7, when the collision surface 14 is inclined at an angle of 45 ° with respect to the accelerating tube, the above problems are less likely to occur when the thermoplastic resin is crushed. However, the impact force used for crushing at the time of collision is small, and further the crushing due to the secondary collision with the crushing chamber wall 6 is small, so the crushing capacity is 1/2 to 1/1 compared with the crusher of FIG. It falls to .5.

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.
A crusher described in Japanese Patent No. 254266 has been proposed.
In Japanese Utility Model Laid-Open No. 1-148740, as shown in FIG.
It has been proposed to prevent the reflected flow on the collision surface by arranging the material collision surface 14 of the collision member at right angles to the axis of the accelerating tube and providing the material collision surface with a conical projection 15. .

Further, in Japanese Unexamined Patent Publication No. 1-254266,
As shown in FIG. 8, by making the tip of the collision surface of the collision member a specific conical shape, the powder concentration in the vicinity of the collision surface is lowered and the secondary collision with the powder chamber wall 6 is efficiently performed. A collision-type airflow crusher has been proposed.

Further, the toner or the colored resin powder for toner used in the image forming method by the electrophotographic method usually contains at least a binder resin and a colorant or a magnetic material.
The toner develops the electrostatic charge image formed on the latent image carrier,
The formed toner image is transferred to a transfer material such as plain paper or a plastic film, and the toner image on the latent image carrier is transferred to a transfer material by a fixing device such as a heat fixing method, a pressure roller fixing means or a heat pressure roller fixing means. Is fixed in. Therefore, the binder resin used for the toner has a characteristic of being plastically deformed when heat and / or pressure is applied.

At present, a toner or a colored resin powder for a toner is melt-kneaded with a mixture containing at least a binder resin and a colorant or magnetic powder (and optionally a third component), and the melt-kneaded product is cooled. Then, the cooled product is crushed, and the crushed product is classified. The cooled product is usually crushed (or medium crushed) by a mechanical impact crusher, and then the crushed coarse powder is finely crushed by a collision type air flow crusher using a jet stream. The collision type air flow crusher using a jet air flow conveys the powder raw material by the jet air flow, collides the powder raw material with a collision member, and pulverizes by the impact force.

Conventionally used crushers include the crushers shown in FIG. 6, FIG. 7, FIG. 8 or FIG. By producing an electrostatic charge image developing toner using the collision type airflow pulverizer configured as described above, the conventional problems are considerably improved, but it is not sufficient yet, and as a recent need, In order to realize higher definition and higher image quality, it is desired to reduce the diameter of the toner, and a more efficient method for producing the toner is desired.

Further, as another demand required for the toner, there is a case where it is necessary to control the particle shape, and in particular, in order to achieve the requirement that the particles are rounded or the corners of the particles are reduced. In many cases, it becomes a means of reducing the efficiency of crushing. Therefore, there is a demand for a crushing device and a crushing method that can achieve both control of particle shape and improvement of crushing efficiency.

[0015]

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 new collision type air flow crusher capable of efficiently crushing powder raw materials. is there. Further, another object of the present invention is to solve the above problems of the prior art and to provide a manufacturing method capable of efficiently manufacturing a toner for developing an electrostatic charge image.

[0016]

The above object can be achieved by the present invention described below. That is, the present invention relates to a collision type air flow crusher having an accelerating tube for conveying and accelerating an object to be crushed by high-pressure gas, and a crushing chamber for finely crushing the object to be crushed. Has a crushed object supply port for supplying the crushed object into the accelerating tube, and a collision member having a spherical collision surface provided facing the opening surface of the exit of the accelerating tube is provided in the crushing chamber. The collision type air flow crusher, wherein the crushing chamber is provided with a side wall for further crushing the object to be crushed by the collision member by collision, and the crusher is used. And a method for producing a toner for developing an electrostatic image.

[0017]

In the collision type air flow crusher, a crushed material supply port for supplying the crushed object into the accelerating tube is provided at the rear end of the accelerating tube, and the crushing chamber is provided with an opening surface of the accelerating tube facing the opening surface. By providing a collision member having a spherical collision surface provided and a side wall for further crushing the crushed object crushed by the collision member in the crushing chamber, the powder raw material can be efficiently crushed. It is possible to provide a collision-type airflow crusher.

[0018]

EXAMPLES The present invention will be described in more detail based on examples. Example 1 FIG. 1 is a schematic cross-sectional view of an example of the present invention and a diagram showing a flow chart of a pulverizing apparatus in which a pulverizing step using the pulverizer and a classifying step by a classifier are combined. Figure 2
1 is an enlarged cross-sectional view showing the accelerating pipe throat portion and the high-pressure gas jet nozzle along line AA in FIG. 1, and FIG. 3 is a cross-sectional view showing the high-pressure gas supply port and high-pressure gas chamber along line BB in FIG. 4 is a sectional view showing the crushing chamber and the collision member taken along the line C-C in FIG. 1.

Explaining the crusher shown in FIG. 1, it has an accelerating tube 21 for accelerating the object to be crushed by high-pressure gas, and a collision member 30 having a collision surface provided opposite to the accelerating tube. The accelerating pipe 21 has a Laval nozzle shape, and a high-pressure gas jet nozzle 23 is arranged upstream of the throat portion of the accelerating pipe 21, and the outer wall of the high-pressure gas jet nozzle 23 and the throat portion 22.
The object to be crushed supply port 24 is provided between the inner walls of the
The crushing chamber connected to the outlet of No. 1 has a circular cross section in the axial direction.

The crushed material supplied from the crushed material supply cylinder 25 is coaxial with the inner wall of the accelerating tube throat portion 22 of the accelerating tube 21 whose central axis is arranged in the vertical direction and the center of the accelerating tube. It reaches the object to be crushed supply port 24 formed between the outer wall of a certain high-pressure gas jet nozzle 23. On the other hand, the high-pressure gas is introduced from the high-pressure gas supply port 26 and the high-pressure gas chamber 2
7 through one, preferably a plurality of high-pressure gas introduction pipes 28
Through the high-pressure gas jet nozzle 23 toward the accelerating pipe outlet 29, and is rapidly expanded.

At this time, due to the ejector effect generated in the vicinity of the accelerating tube throat portion 22, the crushed material is entrained in the gas coexisting with the crushed material and directed from the crushed material supply port 24 toward the acceleration tube outlet 29. Is rapidly sucked and rapidly accelerated while being uniformly mixed with the high-pressure gas in the accelerating tube throat portion 22, and a uniform solid-gas mixture air flow is provided on the collision surface of the collision member 30 opposed to the accelerating tube outlet 29 without biasing the dust concentration. It collides in the state of and is crushed.

In the crusher shown in FIG. 1, the collision surface of the collision member has a spherical shape. According to this crusher, the impact force generated at the time of collision is applied to the sufficiently dispersed individual particles (objects to be crushed), so that the crushing can be performed very efficiently.
The crushed material crushed by the spherical collision surface of the collision member 30 is dispersed in the entire circumferential direction, and further, the crushing chamber side wall 32 and the collision member 30.
Repeated collisions between the surfaces increase the grinding efficiency,
The crushed material is discharged from the crushed material discharge port 33 provided behind the collision member 30.

The crushing device of the present invention is characterized by having a specific raw material supply means and having a collision member having a spherical shape. An air flow crusher having a spherical collision member is disclosed in Japanese Patent Laid-Open No.
-210252 and Japanese Patent Laid-Open No. 4-210255. In Japanese Patent Laid-Open No. 4-210252, a spherical collision member is installed in front of a crushing nozzle of a swirling flow type jet crusher, and there is no effect of a secondary collision with the wall of the crushing chamber, and the raw material is supplied. The method is completely different from that of the crusher of the present invention, and it is considered that the effect of causing collision in a state of being uniformly dispersed on the collision surface is small.

Further, in Japanese Patent Laid-Open No. 4-210255,
Although a structure in which a spherical collision member is provided in the conventional collision type air flow crusher of FIG. 6 is disclosed, in this crusher, the object to be crushed supply port is communicated with the middle of the acceleration pipe (suction nozzle). , The powder material sucked into the accelerating tube is dispersed immediately after passing through the object to be crushed by the high-pressure gas jet from the high-pressure gas supply nozzle, rapidly changing the flow path toward the accelerating tube outlet. Suddenly accelerated.

In this state, if the powder raw material has relatively coarse particles, the low flow part of the accelerating tube is affected by the inertial force,
In addition, relatively fine particles pass through the high flow part of the accelerating tube, and are not uniformly dispersed in the high-pressure air stream. The colliding member partially collides with the colliding member, which lowers the pulverizing efficiency and lowers the processing capacity. In addition, during long-time operation, partial abrasion of the collision member is likely to occur, and fusion is likely to occur when a raw material containing a thermoplastic resin as a main component such as toner is crushed.

On the other hand, in the crusher of the present invention shown in FIG. 1, the jetting direction of the high-pressure gas and the feeding direction of the crushed object are made to be the same direction, so that the powder raw material is adjusted to the dust concentration in the accelerating pipe. It can be dispersed in a uniformly high-pressure air stream so that there is no bias. Therefore, it is possible to uniformly collide with the collision member without unevenness in the dust concentration, and to improve the pulverization efficiency.

If the inclination of the acceleration tube 1 in the long axis direction is preferably within the range of 0 to 20 ° with respect to the vertical direction, the crushed material can be processed without being blocked by the crushed material supply port. is there. If the fluidity of the material to be ground is not good, the material to be ground may stay below the material supply pipe of the material to be ground, and the inclination of the acceleration tube 1 is more preferably 0 to 5 ° with respect to the vertical direction.

The particle shape of the pulverized material finely pulverized by the pulverizing apparatus of the present invention has a shape with fewer corners than that of the pulverized material obtained by the conventional collision type airflow powder machine. This is because when a spherical collision surface is used, the powder is efficiently dispersed in the entire circumferential direction,
This is because the effect of the secondary crushing with the side wall of the crushing chamber is enhanced, but the impact force of the primary crushing on the collision surface is smaller than that of the conventional flat collision member.

Therefore, in the case of a flat collision member, volume crushing is mainly performed, and the crushed surface shape tends to be angular. However, in the case of a spherical collision member, since the impact force is small, not only volume crushing but surface crushing is performed. It is easy to occur and tends to have a sharp corner. That is, the pulverizer of the present invention has high pulverization efficiency and can control the particle shape.

In the present invention, the installation position of the collision member is
It is preferable that the central axis of the accelerating tube and the center of the collision member are aligned with each other. The closest distance between the collision surface of the spherical collision member and the exit of the acceleration tube is preferably longer than the closest distance between the collision member and the side wall of the grinding chamber. At this time, the secondary collision with the side wall of the crushing chamber can be effectively used. Further, as the size of the collision member, it is preferable that the diameter of the collision member is larger than the diameter of the acceleration tube outlet. Further, the sectional shape of the crushing chamber is not limited to the cylindrical shape, and may be set appropriately.

Example 2 FIG. 5 is a schematic sectional view of another preferred embodiment of the present invention and a diagram showing a flow chart of a pulverizing apparatus which combines a pulverizing step using the pulverizer and a classifying step by a classifier. . The same members as those of the crusher of FIG. 1 have the same reference numerals. Explaining the crusher of FIG. 5, the collision surface of the collision member has a spherical first collision surface 16 and a spherical second collision surface 17. Therefore, the solid-gas mixture flow ejected from the accelerating tube is first pulverized by the first collision surface 16 on the collision member and then second pulverized by the second collision surface 17 formed on the outer periphery thereof. Thirdly crushed by the side wall 32 of the crushing chamber. Compared with the crusher shown in FIG. 1, the crushing effect by the secondary collision on the second crushing surface can further improve the crushing efficiency.
In this embodiment, the case where the collision surface has two stages is shown, but the present invention is not limited to this.

Next, specific examples of the case where the toner for developing an electrostatic charge image is pulverized by using the pulverizer of the present invention are shown below. Example 3 The crusher shown in Example 1 (FIG. 1) was used. The collision type air flow crusher has a collision surface of a spherical shape having a diameter of 60 mmφ, and the closest distance between the collision member and the acceleration pipe outlet is 50 m.
The distance between the collision member and the side wall of the crushing chamber was 30 mm. Further, the center axis of the accelerating tube and the center of the collision member coincided with each other. The inclination of the acceleration tube with respect to the vertical line in the long axis direction was substantially 0 °, and the crushing chamber had a cylindrical shape.

For crushing, pressure 0.59 Mpa, wind force 6.
Compressed air of 0 Nm ³ / min was used. As a pulverization raw material, a hammer mill coarse pulverization (1
mm screen passing product), the pulverized raw material is supplied to the classifier at a rate of 30 kg / hr according to the flowchart of FIG. 1 with a constant amount feeder, and the classified coarse powder is introduced into the pulverizer under the above conditions, 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 8.0 μm was obtained as classified fine powder. When the resulting finely pulverized product was observed with an electron microscope, there were few angular portions. It should be noted that stable operation was possible without the generation of fused substances.

The particle size distribution of the finely pulverized product or toner can be measured by various methods. In the present invention, Coulter Multisizer (manufactured by Coulter Co.) is used. As the electrolytic solution, about 1% NaCl aqueous solution is prepared using first-grade sodium chloride. For example, ISOTONR- (manufactured by Coulter Scientific Japan Co.) can be used. As a measuring method, a surfactant, preferably 0.1 to 5 ml of an alkylbenzene sulfonate as a dispersant is added to 100 to 150 ml of the above-mentioned aqueous electrolyte solution, and the measurement data is 2
Add ~ 20 mg. The electrolytic solution in which the material is suspended is subjected to dispersion treatment for about 1 to 3 minutes with an ultrasonic disperser, and the volume and number of toner are measured using the aperture of 100 μm as an aperture with the above-mentioned measuring device to measure the volume distribution and number. And the distribution was calculated. Then, the weight-based weight average particle diameter obtained from the volume distribution according to the present invention was obtained.

Example 4 The crusher shown in Example 2 (FIG. 5) was used. The collision type airflow crusher has a diameter of the first collision surface of 40 mm, a diameter of the second collision surface of 80 mm, and a closest distance between the tip of the first collision surface and the outlet of the acceleration tube is 30 mm. The distance between the end of the collision surface and the side wall of the crushing chamber was 20 mm. Further, the center axis of the accelerating tube and the center of the collision member coincided with each other. The inclination of the acceleration tube with respect to the vertical line in the long axis direction was substantially 0 °, and the crushing chamber had a cylindrical shape.

For the pulverization, a pressure of 0.59 Mpa and a wind force of 6.
Compressed air of 0 Nm ³ / min was used. As the pulverization raw material, the same hammer mill coarse pulverization (1 mm screen passing product) of the toner for developing an electrostatic charge image as in Example 1 was used, and the pulverization raw material was flown at a rate of 35 kg / hr by a constant quantity feeder. According to the procedure described above, the classified coarse powder was introduced into the pulverizer under the above conditions, pulverized, and then circulated through the classifier again for closed circuit pulverization. As a result, a finely pulverized product for toner having a weight average diameter of 8.0 μm was obtained as classified fine powder. When the obtained finely pulverized product was observed with an electron microscope,
There were few angular parts. It should be noted that stable operation was possible without the generation of fused substances.

Comparative Example 1 The same toner coarse powder as in Example 3 was used to pulverize with a collision type air flow pulverizer shown in FIG. The collision-type airflow crusher used had a collision surface in a plane shape perpendicular to the long axis direction of the acceleration tube. The diameter of the collision member was 60 mm, the distance between the collision surface and the outlet of the acceleration tube was 50 mm, the distance from the crushing chamber wall was 30 mm, and the crushing chamber was shaped like a box.

For crushing, a pressure of 0.59 Mpa and a wind force of 6.
Compressed air of 0 Nm ³ / min was used. As a pulverization raw material, a hammer mill coarse pulverization (1
mm screen passing product), the crushing raw material is supplied to the classifier at a rate of 15 kg / hr according to the flowchart of FIG. 6 by a constant quantity feeder, and the classified coarse powder is introduced into the crusher under the above conditions, 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 8.1 μm was obtained as classified fine powder.

When the finely pulverized product obtained was observed with an electron microscope, the number of angular portions was larger than in Examples 3 and 4. Further, when the supply amount is increased to 15 kg / hr or more, fusion products and agglomerates of the pulverized material will start to be generated on the collision member, which may cause the fusion product to clog the raw material charging port of the accelerating tube, which results in stable operation. I couldn't.

Comparative Example 2 The same coarse toner powder as in Example 3 was used and pulverized by the collision type air flow pulverizer shown in FIG. The collision-type airflow crusher used was a planar one having a collision surface inclined by 45 ° with respect to the long axis direction of the acceleration tube. The diameter of the collision member is 60 mm, the distance between the collision surface and the exit of the acceleration tube is 50 mm,
The distance from the crushing chamber wall was 30 mm, and the crushing chamber was box-shaped.

For crushing, pressure 0.59 Mpa, wind force 6.
Compressed air of 0 Nm ³ / min was used. As a pulverization raw material, a hammer mill coarse pulverization (1
mm screen passing product), the pulverized raw material is supplied to the classifier at a rate of 10 kg / hr according to the flow chart of FIG. 7 by a constant amount feeder, and the classified coarse powder is introduced into the pulverizer under the above conditions, 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 8.1 μm was obtained as classified fine powder. When the obtained finely pulverized product was observed with an electron microscope, the number of angular portions was larger than in Examples 3 and 4. Although no fusion product was generated, the amount of pulverization treatment was extremely small as compared with Examples 3 and 4.

Comparative Example 3 The same toner coarse powder as in Example 3 was used and pulverized by the collision type air flow pulverizer shown in FIG. The collision type airflow crusher used was a conical shape having a collision surface of 160 °. The diameter of the collision member was 60 mm, the distance between the collision surface and the outlet of the acceleration tube was 50 mm, the distance from the crushing chamber wall was 30 mm, and the crushing chamber was shaped like a box. For crushing, pressure 0.5
Compressed air with a wind power of 6.0 Nm ³ / min was used at 9 Mpa. As a pulverization raw material, a hammer mill coarse pulverization (1 mm screen passing product) of an electrostatic charge image developing toner is used,
The pulverized raw material is supplied to the classifier at a rate of 20 kg / hr by a constant quantity feeder according to the flowchart of FIG. 8, and the classified coarse powder is introduced into the pulverizer under the above conditions, pulverized, and then circulated to the classifier again. Closed circuit crushing was performed. As a result, a finely pulverized product for toner having a weight average diameter of 8.0 μm was obtained as classified fine powder. When the obtained finely pulverized product was observed with an electron microscope, the number of angular portions was larger than in Examples 3 and 4. No fused substance was generated.

Comparative Example 4 The same toner coarse powder as in Example 3 was used to pulverize with a collision type air flow pulverizer shown in FIG. The collision-type airflow crusher used was one in which the raw material collision surface of the collision member was perpendicular to the axis of the accelerating tube, and the raw material collision surface was provided with a conical projection having an apex angle of 50 °. The diameter of the collision member was 60 mm, the distance between the collision surface and the outlet of the acceleration tube was 50 mm, the distance from the crushing chamber wall was 30 mm, and the crushing chamber was shaped like a box. For crushing, pressure 0.59 Mpa, wind force 6.0 Nm ³
/ Min of compressed air was used. As a pulverization raw material, a hammer mill coarse pulverization (1 mm screen passing product) of a toner for developing an electrostatic charge image is used, and the pulverization raw material is supplied to a classifier at a rate of 20 kg / hr by a constant amount supply device according to the flowchart of FIG. Then, the classified coarse powder was introduced into the crusher under the above conditions, crushed, and then circulated through the classifier again for closed circuit crushing. As a result, the weight average diameter of the finely divided powder was 8.
A finely pulverized product for toner of 0 μm was obtained.

When the obtained finely pulverized product was observed with an electron microscope, the number of angular portions was larger than in Examples 3 and 4. In addition, the generation of a coarse fused substance was not observed, but 1
When the collision member was inspected after the time operation, it was confirmed that a layer of the fused material of the pulverized material was slightly attached to the raw material collision surface. Table 1 below summarizes the results of Examples 3 to 4 and Comparative Examples 1 to 4 described above.

Table 1 *: In Table 1 above, the pulverization efficiency ratio was expressed as the ratio of the supply amount under each condition when the supply amount of Comparative Example 1 was 1.0.

[0046]

According to the present invention, the material to be pulverized is uniformly dispersed and introduced into the accelerating tube so that there is no bias in the dust concentration, and a solid-gas mixed flow is formed. Improving pulverization efficiency by spraying from the exit of the accelerating tube toward the opposing collision member with good dispersion, colliding with the spherical collision surface provided on the collision member, then dispersed in the entire circumferential direction, and further colliding with the side wall of the crushing chamber. Can be achieved. In particular, in the case of finely pulverizing the toner image developing toner raw material, it is possible to prevent the generation of fused substances and agglomerates of the pulverized substance, reduce the abrasion of the collision surface of the collision member, the inner wall of the acceleration tube and the like in the apparatus, and the efficiency. In addition to being able to pulverize the particles, it is possible to control the particle shape.

[0047]

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

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

FIG. 5 is a schematic sectional view of another collision type airflow crusher of the present invention.

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.

[Explanation of symbols]

 1 ・ ・ ・ Material supply port 2 ・ ・ ・ High pressure gas supply nozzle 3 ・ ・ ・ Accelerator tube 4 ・ ・ ・ Colliding member 5 ・ ・ ・ Discharge port 6 ・ ・ ・ Grinding chamber side wall 7 ・ ・ ・ Powder raw material 8 ・ ・ ・ Grinding chamber 13 ・ ・ ・Accelerator pipe outlet 14 Collision surface 15 Protruding central portion 16 First collision surface 17 Second collision surface 21 Acceleration tube 22 Acceleration tube throat section 23 High pressure gas jet nozzle 24 Milled object supply port 25 ... Grinded object supply tube 26 ... High-pressure gas supply port 27 ... High-pressure gas chamber 28 ... High-pressure gas inlet tube 29 ... Accelerator tube outlet 30 ... Colliding member 32 ... Grinding chamber side wall 33: Grinding chamber discharge port 34: Grinding chamber 35: Collision member support

 ─────────────────────────────────────────────────── (72) Inventor Satoshi Mitsumura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Yoko 3-5-30 Shimomaruko, Ota-ku, Tokyo Canon Within the corporation

Claims (8)

[Claims] 1. A collision type air flow crusher having an accelerating tube for conveying and accelerating an object to be crushed by a high pressure gas, and a crushing chamber for finely crushing the object to be crushed. Has a crushed object supply port for supplying the crushed object into the accelerating tube, and the crushing chamber is provided with a collision member having a spherical collision surface facing the opening surface of the outlet of the accelerating tube. The collision type airflow crusher is characterized in that the crushing chamber has a side wall for further crushing the object to be crushed by the collision member by collision. 2. The collision type airflow crusher according to claim 1, wherein the material to be crushed supply port is provided between the outer wall of the high pressure gas jet nozzle and the inner wall of the throat portion of the accelerating pipe. 3. The collision type airflow crusher according to claim 1, wherein the acceleration tube is installed such that the inclination of the acceleration tube in the long axis direction is 0 to 20 ° with respect to the vertical line. 4. The collision type airflow crusher according to claim 1, wherein the acceleration tube is installed so that the inclination of the acceleration tube in the long axis direction is 0 to 5 ° with respect to the vertical line. 5. A mixture containing at least a binder resin and a colorant is melt-kneaded, the kneaded product is cooled, and the cooled product is pulverized by a pulverizing means to obtain a pulverized product. In the method for producing a toner for developing an electrostatic charge image from a finely pulverized product produced by finely pulverizing the product by a pulverizing means, the collision type air flow pulverizing means conveys and accelerates an object to be pulverized supplied by a high pressure gas. The crushing chamber has an accelerating tube and a crushing chamber for finely crushing the crushed object, and has a crushed object supply port for supplying the crushed object into the accelerating tube at the rear end of the accelerating tube. Is provided with a collision member having a spherical collision surface provided facing the opening surface of the outlet of the acceleration tube, and the crushing chamber further crushes the object crushed by the collision member by collision. For developing an electrostatic charge image, characterized by having a side wall for Manufacturing method. 6. The toner for developing an electrostatic charge image according to claim 5, wherein the pulverized material supply port is provided between the outer wall of the high-pressure gas jet nozzle and the inner wall of the throat portion of the accelerating tube. Method. 7. The toner for developing an electrostatic charge image according to claim 5, wherein the accelerating tube is installed such that the inclination of the accelerating tube in the long axis direction is 0 to 20 ° with respect to the vertical line. Method. 8. The toner for developing an electrostatic charge image according to claim 5, wherein the accelerating tube is installed such that the inclination of the accelerating tube in the long axis direction is 0 to 5 ° with respect to the vertical line. Method.