JPH04290560A - Collision type supersonic jet mill - Google Patents

Abstract

PURPOSE:To improve milling ability by integrating a jet nozzle with a jet path to suppress generation of shock wave by jet and increase acceleration of jet stream. CONSTITUTION:In a mill provided with a body formed by the jet nozzle 6 and the jet path 5 to one body, the material to be milled Ta is fed to the jet path 5 from the supply gate 5a through the path 4. Since the jet nozzle 6 is connected to the base position of the jet path 5 as one body, the acceleration increases by the jet stream. Milling ability increases as shock wave dose not generate in the path 5b and the material to be milled gets up more speed, comes violently into collision with the collision panel 7.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a collision-type supersonic jet pulverizer that uses high-pressure gas as a jet stream, and more specifically, a collision-type supersonic jet pulverizer that crushes coarse particles to be crushed into fine particles. Regarding machines.

0002

2. Description of the Related Art Conventionally, for example, in a dry type electrophotographic copying machine, a toner made of finely powdered resin or the like is used as a developer.

[0003] Such toner is also called dry toner for electrostatic images, and is produced by melt-kneading resin, dye, pigment, etc. in a hot roll mill, cooling it, and coarsely crushing it using a jaw crusher or the like. It is produced by pulverizing coarsely ground material into fine powder using a supersonic jet pulverizer.

FIG. 11 shows an example of a supersonic jet pulverizer that pulverizes a material to be pulverized, such as a resin, into toner particles. JP-A-58-143853, JP-U-51-100574, and JP-A-2-68155 disclose a pulverizer whose main parts are almost the same as the pulverizer shown in FIG.
, Japanese Unexamined Patent Publication No. 1-254266.

[0005] In FIG. 11, a material to be crushed Ta such as coarsely crushed resin is introduced from the raw material input side indicated by reference numeral 1, and is led into a classification process chamber 3 through a passage 2. The to-be-pulverized material Ta leaving the classification process chamber 3 passes through a passage 4 and heads toward a jet jet passage 5 .

On the other hand, high-pressure air is injected from the nozzle 6 due to the inflow of compressed air, and a supersonic jet flow of air is generated in the jet flow path 5. A collision plate 7 is provided opposite the nozzle 6 in the flow direction of this jet flow.

[0007] The material to be crushed coming out of the passage 4 is guided into the jet stream, rides on this jet stream, and travels at high speed (supersonic speed).
While flying, it collides with the collision plate 7, and further collides with the side surface 8 as a secondary collision.

[0008] After the material to be crushed Ta in the form of coarse particles collides with the collision plate 7 at supersonic speed, it collides with the collision plate 8 for a second time.
Pulverized into fine particles.

That is, the object to be crushed becomes a fine powder like toner used for development, and this fine powder Tp passes from the crushing chamber 9 through the passage 10 to the passage 2 together with the object to be crushed Ta and enters the classification process chamber. Sent to 3.

Of the material to be crushed Ta and the fine powder Tp sent to the classification process chamber 3, the latter fine powder is recovered as a product in the direction of the arrow, and the former material to be crushed Ta passes through the passage 4 and returns to the jet jet channel. 5 and is crushed by the collision plate 7.

[0011] As described above, the object to be crushed is crushed, and since this pulverization is performed by colliding the object with the collision plate, this type of supersonic jet crusher is of the collision type. It is called a supersonic jet crusher.

[0012] The pulverization of the object to be pulverized by such a jet pulverizer is carried out by collisions between particles sucked into the jet stream or by their collisions with a collision plate.

[0013] Through the manufacturing process described above, the fine powder is
The feed amount is adjusted to meet the required quality, such as toner particle size, yield value, (collected toner amount/input amount), etc. It is known that the following factors have the greatest influence on quality: (supply amount), crushing air pressure, crushing air flow rate, shape of the collision plate, shape of the secondary collision plate, etc.

[0014] The collision plate is a flat type collision plate disposed in a direction perpendicular to the direction of the jet flow, and has the best crushability. The pulverizability here refers to the processing time required to obtain a toner with a constant particle size distribution.

[0015]

[Problems to be Solved by the Invention] However, although there is currently a desire to create a low-cost toner for the purpose of highly efficient pulverization, when such toner is created by the above-mentioned pulverizer, the pulverization capacity is as shown in Figure 11. In the relationship between the connection method of the jet nozzle 6 and the jet jet channel 5, a shock wave is generated due to the step (seam), and the acceleration inside the jet jet channel is reduced, resulting in a decrease in the collision energy at the collision plate 7. Therefore, there was a problem in that the processing capacity of the crusher was not utilized to its full potential.

It is known that the crushing ability can be improved by adjusting the conditions of the classification process chamber 3 shown in FIG. 11, the air pressure in the jet nozzle 6, and the distance of the collision plate 7.

However, since the supply port 5a of the jet passageway 5 leading to the crushing chamber is narrow, the material to be crushed passing through the passageway 4
In some cases, the capacity may not be utilized to its full potential due to accumulation and clogging.

Furthermore, since the supply port 5 of the jet channel leading to the crushing chamber is narrow, only a small amount of the material to be crushed passes through, resulting in excessive crushing and ultra-fine powder, resulting in a reduction in product yield.

[0019]

[Means for Solving the Problems] In order to solve the above problems, the collision type supersonic jet pulverizer of the present invention includes a jet nozzle that spouts a jet stream into a crushing chamber, and a jet that supplies a material to be crushed to the jet stream. A collision type supersonic jet pulverizer comprising a jet flow path and a collision plate provided at a position facing the jet nozzle, characterized in that the jet nozzle and the jet flow path are integrated.

[0020] Preferably, the jet channel is formed of a metal material and has a surface treated with lining.

[0021] Furthermore, it is preferable that the jet nozzle is provided with an attachment, and the jet stream discharged from the jet nozzle can be freely adjusted by the attachment.

[0022] It is preferable that the supply port provided in the jet flow path for supplying the material to be crushed has an elliptical shape with a long axis in substantially the same direction as the flow path direction of the jet flow.

[0023]

[Operation] The above collision type supersonic jet pulverizer has a jet nozzle that spouts a jet stream into the crushing chamber, a jet jet channel that supplies the material to be crushed to the jet stream, and a collision provided at a position facing the jet nozzle. In the collision-type supersonic jet crusher equipped with a plate, the jet nozzle and the jet jet flow path are integrated, so that generation of shock waves due to the jet flow in the jet jet flow path is suppressed.

[0024] Since the jet channel is formed of a metal material and its surface is lined, the strength, corrosion resistance, and abrasion resistance of the channel through which the jet passes is improved.

[0025] The jet nozzle is equipped with an attachment, and the jet jet discharged from the jet nozzle is freely adjusted by the attachment, so that the collision energy of the jet jet against the collision plate can be set as desired. .

[0026] Furthermore, since the supply port provided in the jet flow path for supplying the material to be crushed has an elliptical shape with a long axis in substantially the same direction as the flow path direction of the jet flow, the area of the supply port can be made large. Can be done.

[0027]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a schematic explanatory diagram showing the main parts of the impingement type supersonic jet pulverizer according to the present invention, and FIG. 2 is a perspective view showing an integrated component of a jet nozzle and a jet jet channel installed in the pulverizer of FIG. 1. , FIG. 3 is a front view thereof.

The material to be crushed Ta passes through the passage 4 to the supply port 5a.
Proceed to the jet flow path 5. This jet channel 5
Since the integrated jet nozzle 6 is connected to the base of the jet, the acceleration increases due to the jet stream. aisle 5
In b, no shock waves are generated, and the object to be crushed further increases in speed and violently collides with the opposing shock plate 7, thereby increasing the crushing ability.

The material of this integrated jet channel is SUS44, which has high processing accuracy, strength, corrosion resistance, and wear resistance.
A material based on 0-C and whose surface was lined with titanium carbide was used.

Example 1 A resin consisting of 15 parts by weight of polyester resin and 85 parts by weight of styrene-acrylic resin was mixed with 5 parts by weight of phthalocyanine pigment (softening point: 80°C), and was melt-kneaded using a hot roll mill. After cooling, the material was roughly pulverized using a jaw crusher, and then finely pulverized using a pulverizer with an air pressure of 6.5 kg/cm2 and an air flow rate of 10 m3/min, using an integrated jet jet nozzle and jet jet channel. 1 to obtain fine powder with an average particle size of 11.0 μm.
It was possible to supply 68 kg/Hr of material to be crushed per hour. Note that a Coulter counter was used as a particle size distribution measuring device.

Example 2 A resin consisting of 75 parts by weight of a polyester resin and 15 parts by weight of a styrene-acrylic resin was mixed with 5 parts by weight of a phthalocyanine pigment (softening point: 69°C), and the mixture was melt-kneaded using a heated roll mill. After cooling, the material was coarsely pulverized using a jaw crusher, and then finely pulverized using a pulverizer with an air pressure of 6.0 kg/cm2 and an air flow rate of 10 m3/min, using an integrated jet nozzle and a jet jet channel. 1 to obtain fine powder with an average particle size of 12.0 μm.
It was possible to supply 95 kg/Hr of material to be crushed per hour.

Comparative Example 1 The same material to be crushed as in Example 1 was finely pulverized using the same type of pulverizer using a nozzle in which a jet jet nozzle and a jet jet channel were connected. As a result, a fine powder with a volume average particle diameter of 11.0 μm was obtained. It was possible to supply 60 kg of the material to be crushed per hour to obtain the following.

Comparative Example 2 The same material to be crushed as in Example 2 was finely pulverized using the same type of pulverizer with a nozzle connected to a jet nozzle and a jet flow path, resulting in a fine powder with a volume average particle diameter of 12 μm. For this purpose, 85 kg of the material to be crushed could be supplied. A summary of the results in Examples 1 and 2 and Comparative Examples 1 and 2 above is shown in Table 1.

[0034]

[Table 1]

FIG. 4 is a perspective view showing an example of an ejection nozzle included in the crusher, FIG. 5 is a front view thereof, and FIG. 6 is a perspective view of an attachment that engages with the ejection nozzle shown in FIGS. 4 and 5. FIG. 7 is a front view thereof, and FIG. 8 is an explanatory diagram showing the ejection nozzle diameter of the ejection nozzle shown in FIG.

The jet nozzle 6 has a cross-sectional area of 50 to 20 mm depending on the material to be crushed by attaching a special attachment shown in FIG.
This can be changed to 0%, and the jet air whose flow rate has been increased by expanding the cross-sectional area of the narrowed part 6b of the jet nozzle passes through the jet jet channel 5, flies to the collision plate 7 at high speed, and the impact force is: This significant increase increases the crushing capacity.

Conventionally, the diameter of the constriction part 6b of the jet nozzle shown in FIG. 8 is set to 1/2.8 of the jet flow path outlet diameter, but when this value is taken as 100%, it is in the range of 100% to 200%. Among these, it is most preferable to select within the range of 120% to 150%, and by increasing the cross-sectional area of the diameter of the jet nozzle, the air flow rate increases and the energy colliding with the collision plate increases, increasing the crushing capacity by 20% to 150%. A significant increase of 50%.

Example 3 A resin consisting of 15 parts by weight of polyester resin and 85 parts by weight of styrene acrylic resin was added with 5 parts by weight of phthalocyanine pigment.
A mixture of parts by weight (softening point: 80°C) was melt-kneaded using a heated roll mill, cooled, and coarsely crushed using a jaw crusher.The cross-sectional area of the jet nozzle was expanded to 130%, and the air flow rate was adjusted to a pressure of 6. 13m3/mi at 5kg/cm2
When an attachment (n) was attached and pulverization was performed, 65 kg of the material to be pulverized could be supplied per hour to obtain a fine powder with a volume average particle size of 12 μm. The crusher used had a maximum air flow rate of 10 m3/min.

Example 4 Using the same toner material as in Example 1, the cross-sectional area of the jet nozzle was expanded to 140%, and the air flow rate was adjusted to a pressure of 6.5 kg.
When an attachment was attached to provide a flow rate of 14 m 3 /cm 2 /min for fine pulverization, 70 kg of the material to be pulverized could be supplied per hour to obtain a fine powder with a volume average particle size of 12 μm.

Example 5 Using the same toner material as in Example 1, the cross-sectional area of the jet nozzle was expanded to 150%, and the air flow rate was adjusted to 6.5 kg/pressure.
When an attachment was installed to produce a flow rate of 15 m3/min in cm2, 76 kg of the material to be ground could be supplied per hour to obtain fine powder with a volume average particle size of 12 μm.

Example 6 A resin consisting of 75 parts by weight of a polyester resin and 15 parts by weight of a styrene acrylic resin was added with 5 parts by weight of a phthalocyanine pigment.
A mixture of parts by weight (softening point: 69°C) was melt-kneaded using a hot roll mill, cooled, and coarsely crushed using a jaw crusher.The cross-sectional area of the jet nozzle was expanded to 120%, and the air flow rate was adjusted to a pressure of 6. 6m3/min at 0kg/cm2
When an attachment was attached and finely pulverized, the rate of pulverization was 3 times per hour to obtain fine powder with a volume average particle size of 10 μm.
It was possible to supply 1 kg of material to be crushed. The crusher used had a maximum air flow rate of 5 m3/min.

Example 7 Using the same toner material as in Example 6, the cross-sectional area of the jet nozzle was expanded to 140%, and the air flow rate was adjusted to a pressure of 6.0 kg.
/cm2 and 7m3/min was attached, and when finely pulverized, 37 kg of the material to be pulverized could be supplied per hour to obtain fine powder with a volume average particle size of 10 μm.

Example 8 Using the same toner material as in Example 6, the cross-sectional area of the jet nozzle was expanded to 200%, and the air flow rate was 6.0 kg/pressure.
When an attachment was attached to provide a flow rate of 10 m3/min in cm2 and pulverization was performed, 45 kg of the material to be pulverized could be supplied per hour to obtain a fine powder with a volume average particle size of 10 μm.

Comparative Example 3 The same toner material as in Example 3 was used, the cross-sectional area of the jet nozzle was 100% of the current one, and the air flow rate was set to a pressure of 6.4.
When the material was pulverized using a pulverizer at a rate of 10 m3/min at a rate of kg/cm2, 50 kg of the material to be pulverized could be supplied per hour to obtain a fine powder with a volume average particle size of 12 μm.

Comparative Example 4 The same toner material as in Example 6 was used, the cross-sectional area of the jet nozzle was 100% of the current one, and the air flow rate was at a pressure of 6.
When the material was pulverized using a pulverizer at a rate of 4 kg/cm2 and 5 m3/min, 25 kg of the material to be pulverized could be supplied per hour to obtain a fine powder with a volume average particle size of 10 μm. Table 2 shows a summary of the results in Examples 3 to 8 and Comparative Examples 3 and 4 above.

[0046]

[Table 2]

FIG. 9 is a perspective view showing an example of a jet flow path provided in a crusher, and FIG. 10 is a front view thereof.

In FIGS. 9 and 10, the jet channel is characterized by having an ellipse in which the supply port 5a has a long axis in the direction of the flow channel at the upper part, and a passage 5b in the jet channel.
It is characterized by its smooth contact with the tapered part of the ring, and its cross-sectional area is wider than that of a perfect circle. In FIG. 9, 5c is an inlet, and 5d is an outlet.

Example 9 A resin consisting of 15 parts by weight of a polyester resin and 85 parts by weight of a styrene-acrylic resin was mixed with 5 parts by weight of a phthalocyanine pigment (softening point: 80°C), and the mixture was melt-kneaded using a heated roll mill. After cooling, the material was coarsely pulverized using a jaw crusher, and then finely pulverized using a pulverizer with an air pressure of 6.5 kg/cm2 and an air flow rate of 10 m3/min, with the supply port of the jet channel expanded to 150%. In order to obtain fine powder with an average particle size of 11.0 μm, 60 kg of the material to be crushed could be fed per hour, and no clogging occurred. Further, the content of ultrafine powder of 5 μm or less at this time was 55.25 in number percent. Note that Coulter Counter TA-II was used as a particle size distribution measuring device.

Example 10 The same toner material as in Example 9 was used and the supply port of the jet flow path was enlarged by 130%, and finely pulverized in the same manner as in Example 9 to obtain a fine powder with a volume average particle diameter of 11.0 μm. 1
It was possible to supply 59 kg/Hr of material to be crushed per hour, and no clogging occurred. Further, the content of ultrafine powder of 5 μm or less at this time was 57.58 in terms of number percent.

Comparative Example 5 When the material was pulverized under the same conditions as in Example 9, with the jet flow path and the supply port being 100% perfectly circular, 59 kg/Hr of the material to be pulverized was fed in order to obtain a fine powder of 11 μm. 5μ
The following ultrafine powder content was 60.00 in number percent, but clogging occurred inside the passage after 60 minutes, making it impossible to continue pulverization. Table 3 shows a summary of the results in Examples 9 and 10 and Comparative Example 5 above.

[0052]

[Table 3]

[0053]

As explained above, the collision-type supersonic jet pulverizer of the present invention includes a jet nozzle that spouts a jet stream into the crushing chamber, a jet jet path that supplies the material to be crushed to the jet stream, and the jet nozzle. In the collision-type supersonic jet crusher equipped with a collision plate provided at a position facing the jet jet, the jet nozzle and the jet jet flow path are integrated, so generation of shock waves due to the jet flow in the jet jet flow path is suppressed. Therefore, the acceleration of the jet flow increases and the crushing ability improves.

[0054] Since the jet channel is made of stainless steel and the surface is lined, the strength, corrosion resistance, and abrasion resistance of the channel through which the jet passes are improved, and the durability against high-speed jets is improved. will improve.

[0055] The jet nozzle is provided with an attachment, and the jet jet discharged from the jet nozzle is freely adjusted by the attachment, so that the collision energy of the jet jet against the collision plate can be set as desired. It becomes possible to easily produce a desired pulverized product.

[0056] Furthermore, since the supply port provided in the jet flow path for supplying the material to be crushed has an elliptical shape with a long axis in substantially the same direction as the flow path direction of the jet flow, the area of the supply port can be made large. This makes it possible to supply the material to be crushed to the crushing chamber without clogging.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing the main parts of a collision type supersonic jet crusher according to the present invention.

FIG. 2 is a perspective view showing an integral component of a jet nozzle and a jet flow path installed in the crusher of FIG. 1;

FIG. 3 is a front view of the integral component shown in FIG. 2;

FIG. 4 is a perspective view showing an example of a jet nozzle included in the crusher.

FIG. 5 is a front view of the jet nozzle shown in FIG. 4;

6 is a perspective view of an attachment that engages the jet nozzle shown in FIGS. 4 and 5. FIG.

FIG. 7 is a front view of the attachment shown in FIG. 6;

8 is an explanatory diagram showing the ejection nozzle diameter of the ejection nozzle shown in FIG. 5. FIG.

FIG. 9 is a perspective view showing an example of a jet flow path provided in the crusher.

FIG. 10 is a front view of the jet channel shown in FIG. 9;

FIG. 11 is a schematic explanatory diagram showing an example of a conventionally used supersonic jet pulverizer.

[Explanation of symbols]

5 Jet flow path 5a Supply port 5b Passage 5c Exit 5d Entrance 6 Spout nozzle 6a　Blowout nozzle attachment part 6b Squeezing part of the jet nozzle 7 Collision plate 9. Grinding chamber Ta　Things to be crushed

Claims (4)

[Claims] 1. A collision type supersonic vehicle comprising: a jet nozzle that spouts a jet stream into a crushing chamber; a jet jet channel that supplies a material to be crushed to the jet stream; and a collision plate provided at a position facing the jet nozzle. A collision type supersonic jet crusher, characterized in that the jet nozzle and the jet jet flow path are integrated. 2. The impingement type supersonic jet pulverizer according to claim 1, wherein the jet channel is formed of a metal material and has a surface treated with a lining. 3. The impingement type supersonic jet crusher according to claim 1, wherein the jet nozzle is provided with an attachment, and the jet flow discharged from the jet nozzle is freely adjusted by the attachment. 4. The supply port provided in the jet flow path for supplying the material to be crushed has an elliptical shape with a long axis in substantially the same direction as the flow path direction of the jet flow. Collision type supersonic jet crusher described in.