JP5380116B2 - Grinding apparatus and method for producing granular detergent composition using the same - Google Patents

Description

  The present invention relates to a pulverizing apparatus and a method for producing a granular detergent composition using the same.

Granular detergent compositions such as garment detergents contain surfactant-containing particles as a major constituent. Such surfactant-containing particles are generally obtained by spray-drying a detergent slurry (a slurry for spray-drying) containing a surfactant such as an anionic surfactant or an alkali builder to form a detergent composition base powder (a spray-dried particle). The base powder (spray-dried particles) is manufactured to have a high bulk density.
As a method for increasing the bulk density of spray-dried particles, for example, a base powder and a liquid binder component are continuously supplied to a kneader and kneaded to obtain a dough-like product. There is a method of producing surfactant-containing particles having a high bulk density by extrusion molding and further pulverizing (pulverizing treatment). In general, the pulverization is performed by connecting a plurality of pulverizers in series to reduce the particle size stepwise.

In recent years, due to increasing environmental awareness, it has become desirable to reduce the burden on the environment even in granular detergent compositions, and in order to respond to this, the surfactant concentration in the detergent composition must be reduced. Is desired. In order to meet such demands, it is necessary to effectively utilize α-sulfo fatty acid alkyl ester salts having high detergency.
However, the powder containing a large amount of the α-sulfo fatty acid alkyl ester salt has a problem that it tends to adhere to the inside of the pulverizing apparatus or the pipe that is pneumatically transported, and the production stability tends to be impaired.

  In order to solve these problems, a method for suppressing the adhesion of detergent particles in the crushing apparatus and in the transportation piping by setting the viscoelasticity of the detergent particles and the crushing tensile strength as an index of surface adhesion within a certain range. Has been proposed (for example, Patent Documents 1 and 2). In addition, a method of preventing detergent particles from adhering to a pulverizer by adding a relatively large amount of zeolite and pulverizing (for example, Patent Document 3), and pulverizing and granulating a detergent raw material to which inorganic sulfate is added Thus, a method for preventing the fine particles of detergent particles from adhering to a pulverizer or the like has been proposed (for example, Patent Document 4).

JP 2005-105211 A JP 2007-291176 A JP 2008-156409 A JP 2008-179800 A

However, the granular detergent composition is required to further reduce the surfactant content. Such granular detergent composition is fragile due to low surfactant content, and tends to increase the amount of fine powder generated during pulverization when pulverizing a pellet-shaped molding with a pulverizer. Since the generated fine powder adheres to the inside of the pulverizing apparatus, there is a problem that the frequency of cleaning in the apparatus increases and the production efficiency decreases.
Then, this invention aims at the manufacturing method of the grinding | pulverization apparatus and granular detergent composition which can be efficiently produced even if it is a granular detergent composition with little content of surfactant.

  The pulverization apparatus of the present invention includes a pulverization chamber and a pulverization unit that is provided inside the pulverization chamber and rotates about the horizontal direction as an axis to pulverize the material to be pulverized. The curved surface is close to the locus of the tip of the part, and holes having different diameters are formed stepwise in the rotational direction of the grinding part. It is preferable that the hole diameter of the hole provided rearward from the lower end of the curved surface is smaller than the hole diameter of the hole provided forward from the lower end with respect to the rotation direction of the pulverization unit.

  The method for producing a granular detergent composition of the present invention is characterized in that a kneaded product containing a surfactant is pulverized using the pulverizing apparatus.

  According to this invention, even if it is a granular detergent composition with little content of surfactant, a granular detergent composition can be produced efficiently.

It is sectional drawing which shows an example of the grinding | pulverization apparatus of this invention. It is II-II sectional drawing of the grinding | pulverization apparatus of FIG.

  An embodiment of the pulverizing apparatus of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a pulverizing apparatus 8 according to an embodiment of the present invention. FIG. 2 is a II-II cross-sectional view of the pulverizer 8 of FIG. The crushing device 8 includes a crushing chamber 10 and a crushing unit 40 provided inside the crushing chamber 10.

  The crushing chamber 10 is provided such that its axis is substantially horizontal, and a casing-like casing 50 surrounding the lower portion of the crushing chamber 10 is provided below the crushing chamber 10. In the upper part of the crushing chamber 10, there is provided an input port 12 through which a material to be crushed is input. Inside the crushing chamber 10, a crushing section 40 is pivotally supported so as to be rotatable in the rotation direction A with a substantially horizontal rotation axis O. The lower portion of the crushing chamber 10 is a curved surface 20 that is close to the locus drawn by the tip 41 when the crushing portion 40 rotates in the rotation direction A, and the curved surface 20 is provided with a hole 26 to be a sieve portion 21.

  The lower end of the casing 50 is provided with a discharge port 52 for discharging the pulverized material obtained by pulverizing the material to be pulverized from the pulverizing apparatus 8. The casing 50 includes a first side surface 54, a second side surface 56, a third side surface 58, a fourth side surface 59, and a first bottom surface 55 that is inclined from the lower end of the first side surface 54 toward the discharge port 52. And a second bottom surface 57 inclined from the lower end of the second side surface 56 toward the discharge port 52.

  The crushing part 40 includes a shaft part 44 and a crushing blade 42 provided so as to protrude in the radial direction from the shaft part 44. As shown in FIG. 1, the crushing section 40 has four crushing blades 42 arranged at a pitch of 90 ° in the circumferential direction to form a crushing blade assembly, and as shown in FIG. It is formed by arranging on the shaft portion 44 at an arbitrary interval along O. The shaft portion 44 is connected to a drive unit (not shown).

  The sieving part 21 is formed with a plurality of holes 26 having different diameters stepwise toward the rotation direction A of the pulverizing part 40. Here, “stepwise” means that the sieve portion 21 is divided into two or more regions in the direction of the rotation direction A, and a hole 26 having the same hole diameter is formed in each region, and another region adjacent to an arbitrary region is formed. This means that the hole diameter of the hole 26 formed when compared with an arbitrary region is different, or the hole diameter is gradually changed in the rotation direction A without being divided into regions.

As the sieve portion 21 in which the holes 26 having different hole diameters in the region unit are formed, for example, a region (rear sieve) 24 on the rear side from the lower end P of the curved surface 20 with respect to the rotation direction A of the pulverizing unit 40 and a front portion from the lower end P. A curved surface (front sieve) 22 is divided and the diameter of the rear sieve 24 is smaller than the diameter of the front sieve 22. Or what made the hole diameter of the rear sieve 24 larger than the hole diameter of the front sieve 22 is mentioned. Further, for example, the sieve portion 21 may be divided into three or more regions in the rotation direction A, and the hole diameter may be decreased or increased as the rotation direction A is increased. Also good.
Further, for example, the sieve portion 21 may not be divided into regions, and the holes 26 may be arranged so that the hole diameter gradually decreases in the direction of the rotation direction A, or arranged so as to gradually increase. May be. Alternatively, the hole diameter may be reduced as it goes toward the lower end of the curved surface 20 in the direction of rotation A, and then the hole diameter may be increased as it goes upward.
Especially, it is preferable that the hole 26 is formed so that the hole diameter may become small in the sieve part 21 toward the rotation direction A in steps. For example, what made the hole diameter of the rear sieve 24 smaller than the hole diameter of the front sieve 22 is mentioned. Thus, by making the hole diameter of the rear sieve 24 smaller than the hole diameter of the front sieve 22, fine powder (detergent fine powder) generated from the object to be ground adheres to the grinding apparatus 8 for the following reason. Can be prevented. The material to be crushed that has fallen from the charging port behaves so as to gather at the lower end P of the sieve portion 21 due to gravity. The object to be crushed that has reached the lower end P is crushed by the crushing unit 40 that rotates at high speed. At this time, the generated detergent fine powder behaves so as to be discharged from the rear sieve 24 into the casing 50 according to the rotation of the pulverization unit 40. However, the amount of the fine detergent powder discharged from the rear sieve 24 is controlled by reducing the pore diameter of the rear sieve 24. In this way, it is possible to prevent the detergent fine powder from being biased to a specific location.

The hole diameter of the hole 26 can be determined according to the desired particle size of the pulverized product, and is preferably determined in a range of 3 to 30 times the particle size of the desired pulverized product, for example, 4 to 25. It is more preferable to determine within a double range.
The degree of difference in the hole diameter of each hole 26 is not particularly limited. For example, when two holes 26 having two kinds of hole diameters are provided, the smallest hole diameter is preferably 20 to 80% with respect to the largest hole diameter. More preferably, it is 30 to 70%. If it is within the above range, it is possible to prevent the particle size distribution of the pulverized product from being excessively widened and to suppress the adhesion of the detergent fine powder generated from the pulverized product in the pulverizing apparatus 8 and the pipe.

  The ratio of the total area of the holes 26 for each hole diameter in the sieving part 21 can be determined in consideration of the particle diameter required for the pulverized product. For example, in the case where the holes 26 having two kinds of hole diameters are provided, it is expressed by the total value of the opening area of the smaller one (small opening area) / the total value of the opening area of the larger hole diameter (large opening area). 20 / 80-80 / 20 is preferable and 30 / 70-70 / 30 is more preferable. This is because if it is within the above range, it is possible to suppress adhesion of the detergent fine powder into the pulverizer 8 and the pipe.

The shape of the hole 26 can be determined in consideration of the production efficiency, the strength of the sieve portion 21, and the like, and examples thereof include a perfect circle, an ellipse, and a rectangle. In addition, holes 26 having different shapes may be formed in the sieve portion 21. Examples of the sieve portion 21 provided with such holes 26 include a punching metal in which a plate-like stainless steel or steel is provided with a through hole, a screen or mesh made of linear stainless steel or steel, and the like.
The hole diameter means the inner diameter in the case of a perfect circle, the minor diameter in the case of an ellipse, and the length of the short side in the case of a rectangle.

The degree of proximity between the curved surface 20 and the locus drawn by the tip 41 is determined within a range that does not come into contact with the curved surface 20 when the pulverizing unit 40 rotates and is sufficiently separated to pulverize the object to be crushed efficiently. Can do.
The shape of the curved surface 20 can be determined in consideration of the pulverization efficiency of the object to be crushed. For example, the entire lower portion of the pulverization chamber 10 may be formed along the trajectory drawn by the tip 41 on the basis of the rotation axis O. And it is good also as a shape along the locus | trajectory which the front-end | tip 41 draws a part of lower part of the crushing chamber 10. FIG. From the viewpoint of production efficiency, it is preferable that the entire lower portion of the crushing chamber 10 is shaped along the locus drawn by the tip 41.

  The material of the casing 50 is not particularly limited as long as desired durability can be obtained, and examples thereof include stainless steel and steel.

The shape of the pulverizing blade 42 can be determined according to physical properties such as hardness and brittleness of the object to be crushed. For example, the pulverizing blade 42 may have a blade provided on the entire rotation direction A side, or the rotation direction. A blade may be provided on a part of the A side.
The material of the pulverizing blade 42 can be determined according to its shape and physical properties such as hardness and brittleness of the object to be crushed, and examples thereof include stainless steel.

The manufacturing method of the granular detergent composition using the grinding | pulverization apparatus 8 is demonstrated.
First, the drive unit is activated to rotate the crushing unit 40 in the rotation direction A. Next, the material to be crushed is charged from the charging port 12. The charged material to be pulverized is pulverized by the pulverizing blade 42 of the rotating pulverization unit 40 to become a pulverized material having an arbitrary size. The pulverized material having an arbitrary size passes through the hole 26 of the sieve portion 21 and is discharged from a discharge port 52 provided in the casing 50. The discharged pulverized product may be used as it is as a granular detergent composition, or may be granulated by spraying a surfactant or a fragrance, or mixed with granulated particles obtained by granulating other detergent components. A granular detergent composition can be obtained.

  The material to be crushed contains various components known in the art as detergent components such as various surfactants, inorganic builders, organic builders, fluorescent agents, polymers, anti-caking agents, reducing agents, metal ion scavengers, pH adjusters and the like. It is a molded body. The material to be crushed can be produced by a known method. For example, as a pulverized product, spray-dried slurry containing a surfactant, alkali builder, etc. is spray-dried to produce spray-dried particles, and the spray-dried particles and the binder component are kneaded with a kneader. A shape is mentioned. For example, what obtained by extruding the obtained dough-like thing into a pellet form is mentioned.

  The kind of surfactant contained in the material to be crushed can be an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, or a combination of two or more. . The content of the surfactant in the pulverized material is not particularly limited, but is preferably 30% by mass or less, more preferably 20 to 30% by mass, and still more preferably 22 to 29% by mass. When there is too little content of surfactant, a dough-like thing will be hard to be obtained and the detergency of the granular detergent composition obtained will become low. If the content of the surfactant is too large, detergent fine powder is hardly generated in the first place, and the effects of the present invention tend not to be remarkably exhibited.

  Spray drying can be performed by a known method. For example, the spray-drying slurry is transferred to a spray-drying tower, and spray-dried particles are produced by spraying at a predetermined spray pressure from a spray-drying slurry atomizer installed near the top of the spray-drying tower. Can be manufactured. The spray-drying tower is not particularly limited, and may be a countercurrent type or a cocurrent type, and among them, a countercurrent type having good thermal efficiency is preferable.

  A kneading machine is not specifically limited, A well-known apparatus can be used. For example, a hermetic consolidation apparatus, preferably a horizontal continuous kneader is preferably used. In addition to the kneader, a single screw or twin screw extruder may be used. These apparatuses may be either a batch type or a continuous type.

The size of the pellet-shaped molded product molded by extrusion molding is not particularly limited, and can be determined in consideration of the ability of the pulverizing device 8 and the like, and for example, 1 to 20 mmφ is preferable.
As an extrusion molding machine used for extrusion molding, a known apparatus can be used, and a uniaxial or biaxial screw type extruder, a disk type extruder, or a roll type extruder can be used. A mold is preferable, and a biaxial mold is more preferable.

The pulverization process may be performed using one pulverizer 8, or two or more pulverizers 8 may be used, and the discharge port 52 of an arbitrary pulverizer 8 may be used as the inlet of another pulverizer 8. The pulverization process may be performed by a pulverization apparatus 8 connected to 12 and connected in multiple stages.
When connecting the pulverizers 8 in multiple stages, it is preferable to connect two to three pulverizers 8, and it is more preferable to connect three. In addition, when the pulverizing apparatus 8 is connected in multiple stages, it is preferable to reduce the hole diameter of the sieve portion 21 as it goes to the subsequent stage. In this way, the particle size distribution can be sharpened by connecting the pulverizers 8 in multiple stages and reducing the hole diameter of the holes 26 toward the subsequent stage.

In the pulverization treatment, it is preferable to control the temperature of the object to be crushed by blowing air into the pulverizer. Preferably, the temperature-controlled cold air or hot air is supplied so that the temperature of the pulverized product immediately after pulverization is in the range of 20 to 40 ° C. Device adhesion can be further suppressed within the above range.
The blowing temperature is preferably 10 to 40 ° C. Further, the blown amount is preferably 0.1 to ⁵ m ³ / kg (per unit mass of the object to be crushed).

In the grinding treatment, it is preferable to add a grinding aid. By adding a small amount of the pulverization aid into the pulverization apparatus 8, the pulverization aid can reduce the pulverization power, improve the pulverization particle size, improve the properties of the pulverized product, and the like. The average particle size of the grinding aid is preferably 50 μm or less, and preferably 20 μm or less. Moreover, 0.5-10 mass% is suitable for the addition amount with respect to the whole quantity of a to-be-ground material.
Examples of the grinding aid include aluminosilicates such as stearate and A-type zeolite, alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate, silica such as amorphous silica, calcium silicate, and magnesium silicate. Desirable clay minerals such as acid salts, talc and bentonite, silicon dioxide, titanium dioxide, finely divided sodium carbonate and sodium sulfate are preferred, aluminosilicates and alkaline earth metal carbonates are more preferred, and A-type zeolite is more preferred.
These grinding aids adhere to the surface of the pulverized product and reduce the surface activity of the pulverized product, thereby preventing adhesion to the pulverizer 8 or piping, etc., reducing pulverization power, and improving the fluidity of the pulverized product. Is planned.

  200-1500 micrometers is preferable and, as for the average particle diameter of the ground material obtained in this way, 300-1200 micrometers is more preferable. When the average particle size exceeds 1500 μm, the solubility in washing becomes slow, and there is a possibility that problems such as cloth adhesion and reduction in cleaning power may occur. If it is less than 200 μm, it tends to lead to an increase in the amount of dust generation due to an increase in fine powder, a decrease in the pulverization yield, and a deterioration in fluidity.

The average particle diameter can be measured by a classification operation using a 9-stage sieve having a mesh opening of 1680 μm, 1410 μm, 1190 μm, 1000 μm, 710 μm, 500 μm, 350 μm, 250 μm, and 149 μm and a saucer. In the classification operation, a sieve with a small opening is stacked on a tray in the order of a sieve with a large opening, and a base sample of 100 g / time is placed on the top of the top 1680 μm sieve, and a lid is put on a low-tap sieve shaker (stock) (Iida Seisakusho, Tapping: 156 times / minute, Rolling: 290 times / minute) After shaking for 10 minutes, the sample remaining on each sieve and tray is collected for each sieve.
By repeating this operation, 1410 to 1680 μm (1410 μm), 1190 to 1410 μm (1190 μm), 1000 to 1190 μm (1000 μm), 710 to 1000 μm (710 μm), 500 to 710 μm (500 μm), 350 to 500 μm (350 μm), 250 A classification sample having a particle size of ˜350 μm (250 μm), 149 to 250 μm (149 μm), and a plate to 149 μm (149 μm) is obtained, and the mass frequency (%) is calculated.
Next, the opening of the first sieve with a calculated mass frequency of 50% or more is set to a μm, the opening of the sieve that is one step larger than a μm is set to b μm, and the integration of the mass frequency from the tray to the sieve of a μm is c The average particle diameter (mass 50%) can be obtained by the following formula (1), where d is the mass frequency on the sieve of% and a μm.

  The bulk density of the pulverized product can be determined according to the application, and for example, 0.6 to 1.2 g / mL is preferable, and 0.7 to 1.0 g / mL is more preferable. The bulk density is a value obtained by measurement according to JIS K3362-1998.

As described above, since the crushing device 8 is provided with the holes 26 having different diameters stepwise in the rotation direction A in the sieve portion 21, the detergent fine powder generated from the object to be crushed adheres to a specific position. This reduces the frequency of cleaning in the pulverizer 8 and improves production efficiency.
Although the principle of preventing the adhesion of detergent fine powder is not clear, it can be estimated as follows.
In the pulverizing apparatus 8, the pulverization unit 40 rotates at high speed to pulverize the object to be pulverized, so that turbulent flow is generated in the air in the pulverization chamber 10. In order to prevent the pulverized material from flying up in the crushing chamber 10 and being discharged from the charging port 12 by this turbulent flow, air is often sent from the charging port 12 or the discharge port 52 side is decompressed more than the charging port 12. Thus, an air flow from the inlet 12 toward the outlet 52 is generated.
The airflow from the input port 12 toward the discharge port 52 is influenced by the airflow generated by the rotation of the crushing unit 40 and becomes a flow inclined toward the second side surface 56 side. As a result, the amount of the detergent fine powder sprayed on the second side surface 56 or the second bottom surface 57 increases, and adheres and accumulates at an early stage.
In the present invention, since the hole diameter of the sieve portion 21 varies stepwise in the rotation direction A, the air flow from the inlet 12 to the outlet 52 preferentially flows through the hole 26 having a relatively large hole diameter. The airflow is rectified, and the detergent fine powder can be prevented from flowing biased toward the second side face 56 or the second bottom face 57. As a result, the detergent fine powder can be prevented from adhering in the pulverizing apparatus 8 without excessive accumulation of the detergent fine powder.

  In addition, by making the hole diameter of the rear sieve 24 smaller than the hole diameter of the front sieve 22, the air flow that tends to be inclined toward the second side face 56 side or the second bottom face 57 side is controlled, and the adhesion of detergent fine powder is suppressed. The effect can be further improved.

  Thus, according to this invention, the cleaning frequency which removes the attached detergent fine powder can be reduced, and a granular detergent composition can be produced efficiently.

In the above-described embodiment, four crushing blades 42 constituting the crushing portion 40 are provided so as to protrude in the radial direction from the shaft portion 44. However, the present invention is not limited to this, and the number is 3 or less. It may be 5 or more. Further, the pitch in the circumferential direction of the pulverizing blade 42 is not limited to 90 °.
In addition, in the above-described embodiment, four crushing blades 42 are arranged in the circumferential direction to form a crushing blade assembly, and the two crushing blade assemblies are axial portions at arbitrary intervals along the rotation axis O. However, the present invention is not limited to this, and the number of pulverized blade assemblies may be one or three or more.

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.
(Raw materials used)
・ Α-sulfo fatty acid alkyl ester salt-containing paste (manufactured by Lion Corporation)
Composition: Fatty acid chain length; carbon number 16/18, mass ratio 8/2, active ingredient 63 mass%, nonionic surfactant 16 mass%, impurities such as di-salt and methyl sulfate, 8 mass%, moisture 13 mass%
・ Sodium carbonate: grain ash (manufactured by Soda Ash Japan)
・ Fluorescent agent: Chino Pearl CBS-X (Ciba Japan Co., Ltd.)
・ Potassium hydroxide: flake caustic potash (Asahi Glass Co., Ltd.)
-Linear alkylbenzene sulfonic acid: Raipon LH-200 (manufactured by Lion Corporation)
-LAS-K: linear alkylbenzene sulfonic acid (manufactured by Lion Corporation, Lipon LH-200, AV value (mg number of potassium hydroxide required to neutralize 1 g of LAS-H) = 180.0) for spray drying Neutralized with 48 mass% potassium hydroxide solution in slurry. The compounding quantity in a table | surface shows the mass% as LAS-K.
Acrylic acid / maleic acid copolymer salt: Aqualic TL-400 (manufactured by Nippon Shokubai Co., Ltd., pure 40% by weight aqueous solution)
Nonionic surfactant: ECOROL26 (ECOGREN Co., Ltd., alcohol having an alkyl group having 12 to 16 carbon atoms), an average of 15 moles of ethylene oxide adduct (made by Lion Co., Ltd., 90% by mass pure)
A-type zeolite: Shilton B (manufactured by Mizusawa Chemical Co., Ltd., pure content 80% by mass)
・ Potassium carbonate: Potassium carbonate (powder) (Asahi Glass Co., Ltd.)
・ Sodium sulfate: neutral anhydrous sodium sulfate A0 (manufactured by Shikoku Kasei Co., Ltd.)
Soap: Fatty acid sodium having 12 to 18 carbon atoms (manufactured by Lion Corporation, pure content: 67% by mass, titer: 40 to 45 ° C., fatty acid composition: C12: 11.7% by mass, C14: 0.4% by mass, C16: 29.2 mass%, C18F0 (stearic acid): 0.7 mass%, C18F1 (oleic acid): 56.8 mass%, C18F2 (linoleic acid): 1.2 mass%, molecular weight: 289)

(Production Example 1) Production of ground material [Preparation of spray-dried particles]
In accordance with the composition in Table 1, each component (excluding 2% by mass equivalent of zeolite A used as a coating agent for spray-dried particles) is charged into a reactor having a stirrer and a jacket, and dissolved and dispersed in water (jacket temperature of the stirrer). 75 ° C.) and a slurry for spray drying having a solid concentration of 60% by mass was prepared.
Next, this spray drying slurry is spray dried using a countercurrent drying tower under the following conditions, and a part (2% by mass) of A-type zeolite is introduced as a spray drying particle coat coating agent from the lower part of the spray drying tower. As a result, spray-dried particles were obtained.
Spray drying apparatus: countercurrent type, tower diameter 2.0 m, effective length 5.0 m.
・ Atomization method: Pressure nozzle method.
-Spray pressure: 30 kg / cm < ² >.
-Hot air inlet temperature: 250 degreeC.
-Hot air outlet temperature: 100 ° C.
The resulting spray-dried particles had an average particle size of about 300 μm, a bulk density of 0.3 g / mL, and a water content of 5% by mass.
The moisture content (mass%) in the spray-dried particles was measured with a Kett moisture meter (trade name, manufactured by Ketto Scientific Laboratory; infrared moisture meter). The measurement conditions were 170 ° C. and 20 minutes.

[Granulation of the material to be crushed]
72.3 parts by mass of the obtained spray-dried particles, 15 parts by mass of an α-sulfo fatty acid alkyl ester salt-containing paste, 2 parts by mass of a nonionic surfactant, and 0.5 parts by mass of water were continuously kneaded (manufactured by Kurimoto Steel Corporation). , KRC-S4 type) and kneaded (kneader rotation speed 135 rpm, jacket temperature: jacket inlet 5 ° C., outlet 25 ° C. (cooled by passing water through the jacket)) to prepare a dough-like product. The temperature of the resulting dough was 55 ± 15 ° C.
Next, the obtained dough-like product was put into a pelleter double (product name: EXD-100 type, manufactured by Fuji Powder Co., Ltd.) and extruded from a die having a hole diameter of about 10 mm and a thickness of 10 mm and simultaneously cut (cutter circumference) Speed: 5 m / s) to obtain a pellet-shaped molded body (diameter: about 10 mm, length: 70 mm or less (substantially 5 mm or more)). The surfactant content of the material to be ground was 28.5% by mass.

(Examples 1-6, Comparative Example 1)
As a pulverizer, Fitz Mill (manufactured by Hosokawa Micron Corporation, DKA-3 type) was connected in three stages. In each stage of the pulverizer, a screen (corresponding to the sieve portion 21 of the pulverizer 8 in FIG. 1) provided with a circular hole in accordance with the conditions described in Table 2 is installed. The pulverizer was used. The discharge port of the third-stage crusher was connected to the cyclone separator via a pipe (90-degree elbow, 60 mmφ) having a shape extending downward in the vertical direction and bent in a substantially horizontal direction. The screen corresponding to the sieve part 21 is divided into a front sieve and a rear sieve. All the holes formed in the front sieve have the same hole diameter, and all the holes formed in the rear sieve have the same hole diameter.
Into the pulverizer, 89.8 parts by mass of the pellet-shaped molded product and 6.5 parts by mass of A-type zeolite as a pulverization aid were charged, and the material to be pulverized was pulverized into a pulverized product in the presence of air blowing. The ground material was separated from the inside. After 15 minutes from the start of pulverization, adhesion suppression was evaluated and the results are shown in Table 2.
In addition, the rotation speed of the grinding | pulverization part was described in Table 2 as a ratio (%) with respect to rotation speed 100% = 4700 rpm (circumferential speed of about 60 m / s). Other grinding conditions were as follows. The temperature of the obtained pulverized product was 30 ± 10 ° C., the average particle size was 350 μm, and the bulk density was 0.85 g / mL. In the table, the opening area ratio is a ratio represented by “total opening area of holes in front sieve / total opening area of holes in rear sieve”.
・ Blower temperature: 15 ± 3 ℃
・ Blowing rate (gas / solid ratio): 2.8 ± 0.25 m ³ / kg
・ Processing speed: 230kg / hr

(Evaluation method for adhesion suppression)
[Crushing device adhesion]
After the material to be crushed was pulverized for 15 minutes, the mass of the adhering material adhering to the inner wall of the pulverization chamber and the inner wall of the casing (excluding the sieve portion) was measured. The sum of those masses was evaluated according to the following evaluation criteria. “△” or higher was regarded as acceptable. In addition, the following evaluation criteria were classified with reference to a practical continuous operation period of the pulverizer. The evaluation criteria are “○” for the amount of adhesion that allows continuous operation for 2 weeks or more, “Δ” for the amount of adhesion that allows continuous operation for 1 week or more and less than 2 weeks, and for the level of adhesion that allows continuous operation for less than 1 week. The amount was “x”.

<Evaluation criteria>
○: 0 g or more and less than 10 g Δ: 10 g or more and less than 40 g ×: 40 g or more

[Piping adhesion]
After pulverizing the material to be pulverized for 15 minutes, the mass of the adhering material adhering to the 90 ° elbow (60 mmφ) installed at the discharge port of the third stage pulverizer was measured and evaluated according to the following evaluation criteria. “○” was accepted. In addition, the following evaluation criteria were classified with reference to a practical continuous operation period of the pulverizer. The evaluation criteria are “○” for the amount of adhesion that allows continuous operation for 2 weeks or more, “Δ” for the amount of adhesion that allows continuous operation for 1 week or more and less than 2 weeks, and for the level of adhesion that allows continuous operation for less than 1 week. The amount was “x”.

<Evaluation criteria>
○: 0 g or more and less than 0.1 g Δ: 0.1 g or more and less than 0.2 g ×: 0.2 g or more

As shown in Table 2, Examples 1 to 6 using the pulverizer of the present invention had good pulverizer adhesion and pipe adhesion. Example 3 in which the hole diameter of the rear sieve was made smaller than the hole diameter of the front sieve was pulverized in the first-stage crusher as compared with Example 4 in which the hole diameter of the rear sieve was larger than the hole diameter of the front sieve. It was found that the device adhesion was excellent.
On the other hand, in Comparative Example 1 using a curved surface provided with a hole having a single hole diameter, the first stage grinder adhesion was “x”, and the pipe adhesion was “x”.

8 Crusher 10 Crushing chamber 21 Sieve part 22 Front sieve 24 Rear sieve 20 Curved surface 26 Hole 40 Grinding part 41 Tip

Claims (2)

A crushing chamber, and a crushing unit that is provided inside the crushing chamber and rotates about the horizontal direction as an axis to crush the material to be crushed,
The lower part of the crushing chamber is a curved surface close to the locus of the tip of the crushing part,
On the curved surface, holes having different diameters are formed stepwise toward the rotation direction of the pulverization part,
The pulverizing apparatus, wherein a diameter of a hole provided rearward from the lower end of the curved surface with respect to a rotation direction of the pulverizing unit is smaller than a diameter of a hole provided forward from the lower end . A method for producing a granular detergent composition, wherein a kneaded product containing a surfactant is pulverized using the pulverizing apparatus according to claim 1 .

Images