JP4944401B2 - Impinging airflow type crusher - Google Patents

Description

  The present invention relates to a collision airflow type pulverizer using a jet airflow, a toner manufacturing method for obtaining toner by the pulverizer, and a toner manufactured by the manufacturing method.

  In order to obtain fine particles of toner for developing an electrostatic charge image, as a method for obtaining fine toner particles by using a collision airflow type pulverization apparatus for coarse toner particles, for example, Patent Document 1 discloses a secondary impingement plate with a speed of the jet jet. Accordingly, a technique that can be attached to and detached from the grinding chamber is disclosed. Patent Document 2 discloses a technique that has the same solid angle as the right conical surface of the crushing collision member and defines the apex angle in the longitudinal sectional shape. Patent Document 3 describes a pulverizer provided with a pulverization chamber wall for tertiary pulverization of a secondary pulverized product. Patent Document 4 discloses a technique in which the material collision surface of the collision plate is a flat plane perpendicular to the axis of the nozzle, and a conical protrusion is provided coaxially with the nozzle on the material collision surface. In Patent Document 5, the jet nozzle of the jet nozzle has a first collision part having a flat end surface substantially perpendicular to the jet jet direction of the jet nozzle at the tip, and a bottom surface corresponding to the flat end face of the first collision part. Disclosed is a crushing device comprising a weight-shaped second collision portion having an axis substantially parallel to the jet direction of the jet, and chamfered so that the corner of the front end of the first collision portion of the collision member has a curvature. Yes.

  FIG. 1 shows the configuration of a general impingement airflow type pulverizer. In FIG. 1, coarse particle toner a which is a material to be crushed is supplied to the ejection nozzle 2 from a material to be crushed supply port 3 at the top of the pulverizing apparatus 1. By sending the jet jet b to the jet nozzle 2, the coarse particle toner rides on the high-pressure jet jet and collides with the collision plate 5 provided in the opposite direction while flying at an ultra-high speed, and becomes fine particles. The fine particle toner c which has been finely divided by the collision passes between the collision plate support 6 and the pulverization chamber 4 and is sent to the pulverized material discharge port 7.

  On the other hand, the electrostatic charge image developing toner, which is to be pulverized, has recently become increasingly small in size due to increasing market needs such as improved dot reproducibility for obtaining high-quality images and improved low-frequency fixability for the purpose of energy saving. In addition, sharpening of the particle size distribution is required. Further, as the toner material, a resin having a low softening point is selected, and it is common to contain a wax in order to make the apparatus oilless. As its detriment, there are problems that pulverization is poor and adhesion or sticking to equipment is likely to occur.

  However, in the above prior art, all of the prior arts are biased toward either ultra-small particle size or sharpening of the particle size distribution. To achieve both ultra-small particle size and sharpness, the toner supply amount However, productivity is lowered and costs are increased.

Japanese Patent No. 3133100 Japanese Patent No. 3090558 Japanese Patent Laid-Open No. 8-103685 No. 7-25227 Japanese Patent No. 3182039

  The present invention has been made in view of the above circumstances, and an impinging airflow type pulverizer using a jet airflow capable of obtaining a toner having an ultra-small particle size and high sharpness of particle size distribution that can be fixed at low temperature with high image quality. Another object is to provide a toner production method using the pulverizer and a toner produced by the production method.

As a result of intensive studies to solve the above-mentioned problems, as shown in FIG. 2, it is possible to attach the collision member 8 to the collision plate support 6 located behind the collision plate 5 installed at a position facing the jet jet. It was found that it fits the purpose.
Based on the above knowledge, the present invention is as follows as means for solving the above problems. That is,
<1> A collision airflow type pulverization provided with an ejection nozzle for ejecting a jet jet into a pulverization chamber, a jet jet flow path for supplying an object to be crushed to the jet jet, and a collision plate provided at a position facing the ejection nozzle The collision airflow type pulverizer is characterized in that a collision member is provided on the collision plate support body behind the collision plate so that the pulverized material that collides with and collides with the collision plate further collides.
In the collision airflow type pulverizer described in <1>, by installing the collision member on the side surface of the collision plate support, the pressure difference of the airflow from the ejection nozzle outlet to the collision member is reduced, and the airflow velocity is slightly reduced. To do. As a result, the light fine powder particles are strongly affected by the speed reduction of the air flow, and the straightness in the discharge direction is lost. The fine powder particles pass between the collision member and the pulverization chamber without being collided with the collision member, and are sent to the discharge port. Therefore, excessive pulverization of the fine powder particles, which causes the broad distribution, can be suppressed. On the other hand, heavy coarse particles are unlikely to be affected by the decrease in airflow velocity, collide with the collision member while maintaining straightness, and then pass between the collision member and the crushing chamber and are sent to the discharge port. , Selective collision of coarse particles can be obtained. By these two actions, a toner having an ultra-small particle size and a sharp particle size distribution can be obtained.
<2> When the radius of the collision plate is R and the distance from the collision plate to the collision member is L, the collision airflow type pulverizer according to the above <1> satisfying 0.05 <L / R <1.70 It is.
In the collision airflow type pulverizer described in <2>, when the radius of the collision plate is R and the distance from the collision plate to the collision member is L, 0.05 <L / R <1.70 is satisfied. The selectivity of fine particles and powder particles can be further enhanced and sharpened. The L / R is more preferably 0.15 <L / R <1.50, more preferably 0.20 <L from the viewpoint of enhancing the effect of suppressing excessive pulverization of fine particles and the effect of selective pulverization of coarse particles. More preferably /R<1.30. When L / R> 1.70, the difference in straightness between the fine particles and the coarse particles widens, but both particles may not collide with the collision member.
<3> The collision airflow type pulverizer according to any one of <1> to <2>, wherein the collision plate support is divided so that the distance L can be adjusted.
The distance L from the collision plate to the collision member was found to be affected by the effect of suppressing excessive pulverization of fine particles and the effect of selective pulverization of coarse particles. However, when the type of toner to be pulverized is changed. Since the grindability changes, the distance L may need to be adjusted. In the pulverizer described in <3>, the distance L can be easily adjusted by dividing the collision plate support into a plurality of disk shapes as indicated by reference numeral 9 in FIG. It is possible to shorten the work time such as switching.
<4> When the height of the collision member from the collision plate support is H, the collision airflow type according to any one of <1> to <3> that satisfies 0.05 <H / R <0.80 It is a pulverizer.
In the collision airflow type pulverizer described in <4>, when the height of the collision member from the collision plate support is H (see FIG. 4), 0.05 <H / R <0.80 is satisfied. The collision area of coarse particles can be further increased. The H / R is more preferably 0.10 <H / R <0.45, more preferably 0.12 <H from the viewpoint of enhancing the effect of suppressing excessive pulverization of fine particles and the effect of selective pulverization of coarse particles. More preferably /R<0.40. When H / R> 0.80, the airflow speed from the outlet of the ejection nozzle to the collision member is further reduced, the coarse particles are also reduced in speed, and sufficient effects cannot be obtained by pulverization by the collision member. is there.
<5> The collision airflow type pulverizer according to any one of <1> to <4>, wherein 0.04 <D / R <0.80 is satisfied when the collision member thickness is D.
In the collision airflow type pulverizer according to <5>, when D is the thickness of the collision member, 0.04 <D / R <0.80 is satisfied, so that it has sufficient strength even for a long continuous operation. Therefore, the deformation of the collision member does not occur. The D / R is more preferably 0.08 <D / R <0.60, more preferably 0.10 <D, from the viewpoint of enhancing the effect of suppressing excessive pulverization of fine particles and the effect of selective pulverization of coarse particles. More preferably /R<0.55. When D / R> 0, 80, the airflow speed from the outlet of the ejection nozzle to the collision member is further reduced, and the coarse particles may also be reduced in speed, and the collision effect at the collision member may be reduced.
<6> The collision airflow type pulverizer according to any one of <1> to <5>, wherein a material of the collision member is ceramics.
In the collision airflow type pulverizer described in <6>, since ceramics is selected as the material of the collision member, the wear resistance can be remarkably improved.
<7> The collision airflow type pulverizer according to any one of <1> to <6>, wherein the collision member has a surface roughness Rmax of 1.6 μm or less.
In the collision airflow crusher described in <7>, for example, the collision member is subjected to buffing or the like, and is mirror-finished so that the surface roughness becomes Rmax 1.6 μm or less. Can be prevented. As a result, the cleaning work spent for removing the adhesion is shortened and the maintainability is improved.
<8> A toner production method using the collision airflow pulverizer according to any one of <1> to <7>.
<9> A toner produced by the production method according to <8>.

  According to the present invention, a collision airflow type pulverizer using a jet airflow that can solve various problems in the prior art, and can obtain a toner with a very small particle size and high sharpness of particle size distribution that can be fixed at low temperature with high image quality, A toner manufacturing method using the pulverizer and a toner manufactured by the manufacturing method can be provided.

(Impact airflow crusher)
Hereinafter, a collision airflow type pulverizer (hereinafter, also simply referred to as a pulverizer) used in the present invention will be described.
The present invention relates to a collision type comprising an ejection nozzle that ejects a jet jet into a pulverization crushing chamber, a jet ejection channel that supplies an object to be crushed to the jet jet, and a collision plate that is provided at a position facing the ejection nozzle. Examples of the invention relating to an airflow crusher, which are generally known, include a jet mill and a jet atomizer.
Here, in the present invention, “jet jet” means a jet obtained by jetting air from a small hole.
Moreover, the said collision board is not limited to a plate-shaped member, For example, the member which can be normally used as a collision means, such as a block, is included.

  One structural example of the pulverizer is shown in FIG. In FIG. 3, coarse particle toner a which is a material to be crushed is supplied to the ejection nozzle 2 through a jet jet channel 11 from a material to be crushed supply port 3 at the top of the pulverizing apparatus 1. By sending the jet jet b to the jet nozzle 2, the coarse particle toner rides on the high-pressure jet jet and collides with the collision plate 5 provided in the opposite direction while flying at an ultra-high speed, and becomes fine particles. The fine particle toner c atomized by the collision passes between the columnar or cylindrical collision plate support 6 and the pulverization chamber 4 in the apparatus example of this example, and in the middle of this example, the collision plate support in this example. 6 collides with a bowl-shaped collision member 8 provided in a direction orthogonal to 6 and further finely divided, and then is sent to the pulverized product discharge port 7. The collision member 8 in the present invention does not necessarily have to be provided in a direction orthogonal to the collision plate support 6. For example, the collision member 8 is inclined slightly (within 10 °) toward the upstream direction of the jet jet. Also good.

The general speed of the jet jet in the pulverizer of the present invention is 100-3 at the Laval tube outlet.
00 m / s is preferable, and 50 to 350 m / s is more preferable.

(toner)
The toner of the present invention is manufactured by the toner manufacturing method of the present invention described later.
The toner materials used in the present invention are described below.
As the toner material, a binder resin for toner, a pigment, a release agent, a charge control agent, and, if necessary, inorganic fine powder and other additives are used.

-Toner binder resin-
Conventionally known binder resins can be widely used as the toner binder resin. For example, a vinyl resin, a polyester resin, a polyol resin, etc. are mentioned.

  Examples of the vinyl resin include styrene such as polystyrene, poly-P-chlorostyrene, polyvinyltoluene, and the like, and substituted polymers thereof: styrene-p-chlorostyrene copolymer, styrene-propylene copolymer, styrene-vinyl. Toluene copolymer, styrene-vinylnaphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene -Methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-α-chloromethyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-vinyl methyl ether Copolymer, styrene-vinyl Tyl ether copolymer, styrene-vinyl methyl ketone copolymer, styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, styrene-maleic acid copolymer, styrene-maleic acid ester Styrene copolymers such as copolymers: polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate and the like.

  The polyester resin comprises a dihydric alcohol as shown in the following group A and a dibasic acid salt as shown in the group B, and further a trivalent or higher alcohol or carboxylic acid as shown in the group C. An acid may be added as a third component.

  Group A: ethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4 butanediol, neopentyl glycol, 1,4-butenediol, 1,4-bis (hydroxymethyl) Cyclohexane, bisphenol A, hydrogenated bisphenol A, polyoxyethylenated bisphenol A, polyoxypropylene (2,2) -2,2′-bis (4-hydroxyphenyl) propane, polyoxypropylene (3,3) -2 , 2-bis (4-hydroxyphenyl) propane, polyoxyethylene (2,0) -2,2-bis (4-hydroxyphenyl) propane, polyoxypropylene (2,0) -2,2′-bis ( 4-hydroxyphenyl) propane and the like.

  Group B: maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sebacic acid, malonic acid, linolenic acid, these Acid anhydrides or esters of lower alcohols.

  Group C: Trivalent or higher alcohols such as glycerin, trimethylolpropane and pentaerythritol, and higher trivalent carboxylic acids such as trimellitic acid and pyromellitic acid.

  Examples of the polyol resin include an alkylene oxide adduct of an epoxy resin and a dihydric phenol, or a compound having one active hydrogen in the molecule that reacts with the glycidyl ether and an epoxy group, and an active hydrogen that reacts with the epoxy resin. Examples thereof include those obtained by reacting two or more compounds in the molecule.

In addition, if necessary, for example, the following resins can be mixed and used.
Epoxy resin, polyamide resin, urethane resin, phenol resin, butyral resin, rosin, modified rosin, terpene resin, etc.
The epoxy resin is typically a polycondensate of bisphenol such as bisphenol A or bisphenol F and epichlorohydrin.

-Pigment-
Examples of the pigment include black pigment, yellow pigment, orange pigment, red pigment, blue pigment, and green pigment.
Examples of the black pigment include azine dyes such as carbon black, oil furnace black, channel black, lamp black, acetylene black, and aniline black, metal salt azo dyes, metal oxides, and composite metal oxides.
Examples of the yellow pigment include cadmium yellow, mineral fast yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa Yellow G, Hansa Yellow 10G, Benzidine Yellow GR, Quinoline Yellow Lake, Permanent Yellow NCG, Tartrazine Lake. Etc.
Examples of the orange pigment include molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK and the like.
Examples of the red pigment include Bengala, Cadmium Red, Permanent Red 4R, Resol Red, Pyrazolone Red, Watching Red Calcium Salt, Lake Red D, Brilliant Carmine 6B, Eosin Lake, Rhodamine Lake B, Alizarin Lake, Brilliant Carmine 3B, and the like. Is mentioned.
Examples of the violet pigment include Fast Violet B and Methyl Violet Lake.
Examples of the blue pigment include cobalt blue, alkali blue, Victoria blue lake, phthalocyanine blue, metal-free phthalocyanine blue, phthalocyanine blue partially chlorinated, first sky blue, and indanthrene blue BC.
Examples of the green pigment include chrome green, chromium oxide, pigment green B, and malachite green lake.
These may be used individually by 1 type and may use 2 or more types together.
Although the usage-amount of the said pigment does not have a restriction | limiting in particular, 0.1-50 mass parts is preferable with respect to 100 mass parts of binder resin.

-Release agent-
Examples of the release agent include synthetic waxes such as low molecular weight polyethylene and polypropylene, copolymers thereof, plant waxes such as candelilla wax, carnauba wax, rice wax, wood wax, jojoba wax, beeswax, Examples thereof include animal waxes such as lanolin and whale wax, mineral waxes such as montan wax and ozokerite, and fat waxes such as hardened castor oil, hydroxystearic acid, fatty acid amide, and phenol fatty acid ester.
Among these, carnauba wax and polypropylene are preferable.

-Charge control agent-
The following are used as the charge control agent.
To control the toner to be positively charged, nigrosine, a quaternary ammonium salt, an imidazole metal complex or a salt may be used alone or in combination of two or more.
Examples of toners that control negative charge include salicylic acid metal complexes, salts, organoboron salts, calixarene compounds, and the like.

-Inorganic fine powder-
Further, the toner of the present invention can be used by adding inorganic fine powder to the toner as a fluidity improver and is particularly preferable.
In the toner in which the state of presence of the release agent in the small particle size toner, which is a feature of the present invention, is more effective due to the presence of a small amount of inorganic fine powder, a highly fluid and highly durable toner is obtained. Can be provided.

As the inorganic fine powder, oxidation of Si, Ti, Al, Mg, Ca, Sr, Ba, In, Ga, Ni, Mn, W, Fe, Co, Zn, Cr, Mo, Cu, Ag, V, Zr, etc. And composite oxides.
Of these, fine particles of silicon dioxide (silica), titanium dioxide (titania), and alumina are preferably used.
Furthermore, it is effective to subject the inorganic fine powder to a surface modification treatment with a hydrophobizing agent or the like. Typical examples of the hydrophobizing agent include the following.
Dimethyldichlorosilane, trimethylchlorosilane, methyltrichlorosilane, allyldimethyldichlorosilane, allylphenyldichlorosilane, benzyldimethylchlorosilane, bromomethyldimethylchlorosilane, α-chloroethyltrichlorosilane, p-chloroethyltrichlorosilane, Chloromethyldimethylchlorosilane, chloromethyltrichlorosilane, p-chlorophenyltrichlorosilane, 3-chloropropyltrichlorosilane, 3-chloropropyltrimethoxysilane, vinyltriethoxysilane, vinylmethoxysilane, vinyl-tris (β-methoxyethoxy) ) Silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, divinyldichlorosilane, dimethylvinylchlorosilane, octyl Trichlorosilane, decyl-trichlorosilane, nonyl-trichlorosilane, (4-t-propylphenyl) -trichlorosilane, (4-t-butylphenyl) -trichlorosilane, diventyl-dichlorosilane, dihexyl-dichlorosilane, dioctyl-dichlorosilane, dinonyl -Dichlorosilane, didecyl-dichlorosilane, didodecyl-dichlorosilane, dihexadecyl-dichlorosilane, (4-t-butylphenyl) -octyl-dichlorosilane, dioctyl-dichlorosilane, didecenyl-dichlorosilane, dinonenyl-dichlorosilane, di-2-ethylhexyl-dichlorosilane, di- 3,3-dimethylbenthyl-dichlorosilane, trihexyl-chlorosilane, trioctyl-chlorosilane, tridecyl-chlorosilane Dioctyl-methyl-chlorosilane, octyl-dimethyl-chlorosilane, (4-t-propylphenyl) -diethyl-chlorosilane, octyltrimethoxysilane, hexamethyldisilazane, hexaethyldisilazane, diethyltetramethyldisilazane, hexaphenyldisilazane , Hexatolyl disilazane and the like.
In addition, titanate coupling agents and aluminum coupling agents can also be used.

  The inorganic fine powder is preferably used in an amount of 0.1 to 2% by mass based on the toner. If the amount is less than 0.1% by mass, the effect of improving the toner aggregation is poor. If the amount exceeds 2% by mass, problems such as toner scattering between fine lines, contamination in the machine, scratches and abrasion of the photoreceptor tend to occur. is there.

-Other additives-
In addition, the developer of the present invention may further contain other additives, for example, a lubricant powder such as polytetrafluoroethylene-based fluororesin powder, zinc stearate powder, and polyvinylidene fluoride powder within a range that does not substantially adversely affect the developer; Or abrasives such as cerium oxide powder, silicon carbide powder and strontium titanate powder; or conductivity imparting agents such as carbon black powder, zinc oxide powder and tin oxide powder; and white particles and black fine particles of opposite polarity A small amount can be used as a developability improver.

  The toner produced according to the present invention may be prepared by adding a widely used toner additive, for example, a fluidizing agent such as colloidal silica, a metal oxide such as titanium oxide or aluminum oxide, or silicon carbide. An abrasive such as a lubricant, a lubricant such as a fatty acid metal salt, and the like may be included.

-Measuring method of toner particle size distribution-
The method for measuring the particle size distribution of the toner particles is not particularly limited, but a Cole counter method and the like are preferable.
Examples of the measuring device for the particle size distribution of toner particles by the Coulter counter method include Coulter Counter TA-II and Coulter Multisizer II (both manufactured by Coulter Co.). The measurement method is described below.
First, 0.1 to 5 ml of a surfactant (preferably alkylbenzene sulfonate) is added as a dispersant to 100 to 150 ml of an aqueous electrolytic solution. Here, the electrolytic solution is an about 1% NaCl aqueous solution prepared using primary sodium chloride, and for example, ISOTON-II (manufactured by Coulter) can be used. Here, 2 to 20 mg of a measurement sample is further added. The electrolytic solution in which the sample is suspended is subjected to a dispersion treatment with an ultrasonic disperser for about 1 to 3 minutes, and the measurement device is used to measure the volume and number of toner particles or toner using a 100 μm aperture as the aperture. Volume distribution and number distribution are calculated. From the obtained distribution, the volume average diameter and number average particle diameter of the toner can be determined.
As channels, 2.00 to less than 2.52 μm; 2.52 to less than 3.17 μm; 3.17 to less than 4.00 μm; 4.00 to less than 5.04 μm; 5.04 to less than 6.35 μm; 6 Less than 35 to 8.00 μm; less than 8.00 to less than 10.08 μm; less than 10.08 to less than 12.70 μm; less than 12.70 to less than 16.00 μm; less than 16.00 to less than 20.20 μm; Uses 13 channels of less than 40 μm; 25.40 to less than 32.00 μm; 32.00 to less than 40.30 μm, and targets particles having a particle size of 2.00 μm to less than 40.30 μm.

(Toner production method)
The toner production method of the present invention is performed using the pulverizer of the present invention.
Hereinafter, a method for producing an electrostatic charge image developing toner in the present invention will be described.
A plurality of types of raw materials as described above are metered and mixed. Here, as the mixing device, a double cone mixer, a V-type mixer, a drum-type mixer, a super mixer, a Henschel mixer, a Nauter mixer, or the like can be used.
Next, kneading is performed in a kneading step. At that time, it can be kneaded using a batch type extruder (for example, a pressure kneader, a Banbury mixer, a two-roller, etc.) or a continuous type extruder, but from the advantage of being able to produce continuously, a single or twin screw extruder. For example, KTK type twin screw extruder manufactured by Kobe Steel, TEM type twin screw extruder manufactured by Toshiba Machine Co., Ltd., KCK extruder, PCM type twin screw extruder manufactured by Ikekai Tekko Co., Ltd., Kuriyama Seisakusho Co., Ltd. A screw extruder, a bus kneader, etc. are used.
The barrel of the extruder used in this process is divided into a plurality of parts, and has a heating means such as an electric heater and a cooling means such as a cooling pipe inside, and is adjusted to a desired temperature by a temperature control panel. .
In the barrel, there is provided a screw which is engaged with a biaxial screw and rotates at a high speed of about 100 to 500 rpm in the same direction.
Although the structure of the said screw can be selected timely, for example, you may be comprised with the feed part screw and the kneading part screw.
The toner raw material mixture is fed from the hopper to the feed screw by a screw feeder and gradually preheated, and a strong share is applied by the kneading screw to disperse the raw material by the self-heating of the main raw material itself, It changes from a semi-molten state to a molten state.
Furthermore, by providing a second kneading part screw at the rear part or changing the screw shape and configuration to a high temperature state where the kneaded material is sufficiently melted, the paintability of the resin and the colorant can be improved. it can. Also, it is preferable to vent by providing a plurality of vent ports at the rear of the part where the kneaded material is in a molten state.Furthermore, by filling a part or all of the vent ports with a pump or the like, the filled state of the kneaded material can be reduced. This is preferable because it improves the dispersibility and improves the removal efficiency of the exhibiting component.
Further, the number of axes of the continuous extruder is preferably uniaxial or biaxial. The number of screw strips can be selected as appropriate in consideration of dispersibility, productivity, kneading temperature, and the like from 2, 3 and the like.
As for the size of the extruder, it is preferable that the screw feed part, kneading part and a plurality of vent ports of the kneaded product can be sufficiently arranged, the inner diameter of the barrel is D (mm), and the length from the raw material supply port to the outlet is set. L / D in the case of L (mm) is preferably 20 or more, and more preferably 25 or more.

The kneaded product is rolled by a rolling roll or the like, and cooled by air cooling, water cooling or the like in a cooling step. Next, it is roughly pulverized by a crusher, hammer mill, feather mill or the like, and finely pulverized by a collision airflow type pulverizer such as a jet mill or a jet atomizer, and gradually pulverized to a predetermined toner particle size. After crushing, inertia class elbow jet, centrifugal class microplex, DS
Classification is performed with a separator or the like to obtain a classified toner.

Furthermore, when externally added to the toner, predetermined amounts of various known additives are blended into the classified toner, and after stirring and mixing with a high-speed stirrer that gives shearing force such as a super mixer and a Henschel mixer, After passing through a sieving step for removing dust and the like mixed in the manufacturing process, the toner is filled into a container as the final toner.

Examples of the present invention will be described below, but the present invention is not limited to these examples.
Example 1
The configuration of the pulverizing apparatus of Example 1 is shown in FIG. In FIG. 3, coarse particle toner “a” to be pulverized is supplied to the ejection nozzle 2 from the pulverized material supply port at the top of the pulverizer 1.
By sending the jet jet b to the jet nozzle 2, the coarse particle toner rides on the high-pressure jet jet and collides with the collision plate 5 provided in the opposite direction while flying at an ultra-high speed, and becomes fine particles. The finely divided fine particle toner c due to the collision passes between the collision plate support 6 and the pulverization chamber 4, collides with the collision member 8 provided in the middle thereof, and is sent to the pulverized material discharge port 7.
The grinder used was IDS-20 (IDS type maximum ejection flow rate of 20 m ³ / min specification). The inside diameter of the grinding chamber is 231Φ, and the inside diameter of the discharge port is 152Φ.
The following specifications were used for the collision plate and the collision member.
The surface roughness Rmax was measured with Surfcom (manufactured by Tokyo Seimitsu Co., Ltd.).

* The collision plate, the collision plate support, and the collision member used were divided as shown in FIG.
The method for securing the coarse particle toner charged as the material to be crushed this time is described below.
Styrene / acrylic resin 20 parts by weight Polyester resin 80 parts by weight Carbon black 10 parts by weight Carnauba wax 4.95 parts by weight Quaternary ammonium salt 2 parts by weight After mixing the above raw materials with a super mixer, a TEM type twin screw kneader (Toshiba) Machine). After cooling, coarse pulverization is performed with a hammer mill to obtain coarse particle toner.
The obtained coarse particle toner was pulverized by the above pulverizer and evaluated as follows.
(I) Volume average particle size Evaluation (II) Particle size distribution sharpness (Dv / Dn) evaluation Volume average particle size, number average particle size, mass average particle size, and particle size distribution sharpness are measured by Coulter Counter TAII (Coulter) The measurement was carried out. The sharpness (Dv / Dn) was determined by the following calculation formula.

〔formula〕
Sharpness (Dv / Dn) = Mass average particle diameter / Number average particle diameter (III) Continuous operation Collision member deformation evaluation The coarse particle toner is pulverized by the above pulverizer for 100 hours, and the collision member is deformed. Visual evaluation was made.
(IV) Continuous Operation Collision Member Wear Evaluation The coarse particle toner was pulverized by the above pulverizer for 100 hours and the wear state of the collision member was visually evaluated.
(V) Continuous operation Collision member adhering amount evaluation After measuring the mass of the collision member before the operation of the apparatus, it is attached to the collision support.
Thereafter, the coarse particle toner was pulverized continuously by the pulverizer for 100 hours, only the collision member was removed from the collision plate support, and the mass was measured to calculate the increased mass before and after operation.
The respective evaluation results are shown in Table 10.

(Example 2)
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

(Example 3)
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

Example 4
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

(Example 5)
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

(Example 6)
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

(Example 7)
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

(Example 8)
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

Example 9
The collision plate / collision plate support / collision member used in Example 1 was changed to one having the following specifications, and the same evaluation as in Example 1 was performed. The results are shown in Table 10.

(Comparative Example 1)
The same evaluation as in Example 1 was performed except that only the collision plate / collision plate support used in Example 1 was used and no collision member was used. The results are shown in Table 10.

FIG. 1 is a diagram showing a configuration of a conventional general collision airflow type pulverizer. FIG. 2 is an explanatory view of a collision member of the present invention. FIG. 3 is a configuration diagram of a collision airflow type pulverizer equipped with a collision member according to the present invention. FIG. 4 is an explanatory diagram of length symbols in the claims of the present invention. FIG. 5 is a view showing a collision plate support, a collision plate, and a collision member that are divided into discs according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crushing device 2 Jet nozzle 3 Ground supply port 4 Crushing chamber 5 Collision plate 6 Collision plate support body 7 Crushed material discharge port 8 Collision member 9 Support body divided | segmented on disk 10 For support body which can be attached to code | symbol 9 Collision member 11 Jet jet flow path a Coarse particle toner b Jet jet c Fine particle toner D Collision member thickness H Collision member height L Distance from collision plate to collision member R Collision plate radius

Claims (7)

  In a collision airflow type pulverizer comprising an ejection nozzle that ejects a jet jet into a pulverization chamber, a jet jet channel that supplies an object to be crushed to the jet jet, and a collision plate that is provided at a position facing the ejection nozzle. The collision plate has a planar collision surface and is positioned perpendicular to the axial direction of the ejection nozzle, and the collision member is further arranged to collide with the collision plate so that the pulverized material collides with the collision plate. A collision airflow type pulverizer characterized in that the collision airflow pulverizer is provided on the collision plate support at a rear side.   The collision airflow type pulverizer according to claim 1, wherein 0.05 <L / R <1.70 is satisfied, where R is a radius of the collision plate and L is a distance from the collision plate to the collision member.   The collision airflow type pulverizer according to claim 2, wherein the collision plate support is divided so that the distance L can be adjusted.   The collision airflow type pulverizer according to any one of claims 2 to 3, wherein 0.05 <H / R <0.80 is satisfied, where H is the height of the collision member from the collision plate support.   The collision airflow type pulverizer according to any one of claims 2 to 4, wherein 0.04 <D / R <0.80 is satisfied when the thickness of the collision member is D.   The impingement airflow type pulverizer according to any one of claims 1 to 5, wherein the material of the impingement member is ceramics.   The collision airflow type pulverizer according to any one of claims 1 to 6, wherein the collision member has a surface roughness Rmax of 1.6 µm or less.