WO1998039087A1 - Mixer for cohesive powder materials - Google Patents
Mixer for cohesive powder materials Download PDFInfo
- Publication number
- WO1998039087A1 WO1998039087A1 PCT/NO1998/000075 NO9800075W WO9839087A1 WO 1998039087 A1 WO1998039087 A1 WO 1998039087A1 NO 9800075 W NO9800075 W NO 9800075W WO 9839087 A1 WO9839087 A1 WO 9839087A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rubbing
- wanes
- mixer
- rotor
- materials
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
- B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
Definitions
- the present invention relates to a method and a mixer for mixing of especially cohesive powder materials.
- many industrial processes involve the mixing of different materials in one way or another, be it raw materials or intermediate products.
- Such industrial mixing processes can vary significantly in complexity, from the quite simple process where desired homogeneity in the mixture is reached with simple means, through the mor difficult processes which put greater demands on the equipment and the process cycles.
- Mixing processes can generally be divided into two categories, namely mixing of liquids, gases, solids in liquids or a combination of such on one hand, and a mixture of parti- culate materials, that is powder in dry form or possibly with a moistened content that is lower than the saturation limit.
- a mixture of parti- culate materials that is powder in dry form or possibly with a moistened content that is lower than the saturation limit.
- Powder affects in a large degree the mixing process itself by the particles physical properties as size, density, form, surface conditions, and so on. Further, the individual particle in a mass of powder at a size that is several orders of magnitude higher than the particles in a fluid.
- the primary function in the mixture of one or more cohesive powders in the same mixture requires a velocity gradient that varies from zero and up to peripheral velocity, and at the same time a shearing force larger than the slip force in the micro plane.
- This slip force is the force that the individual particle must have in order to escape the particle lump or heap or agglomerate, that is a collection of single particles that works as a collected particle, so that it works alone and therefore also so that the entire surface, and not only a small side surface becomes available for the mixture's ultimate target, which may be the colouring by pigments.
- the pigment particles consist of a large ball in a football field, which still will look green. If the ball is divided into particles with for example red colour and with the size of 2 ⁇ m, the whole field will look red.
- the pigment particles work as a collection of particles, consisting of for example ten particles of 2 ⁇ m, and the colour yield will then only make one half red, because the pigments are lying on the top of each other and not beside each other.
- the quantity of filling materials with the present invention might be reduced because less solution is required.
- the mass is dissolved into single particles so that one can produce much smaller tablets and in fact make the medicines safer and easier to swallow.
- the mixture of powders is more difficult than the mixture of liquids and gases, especially mixture of dry powders. It is often merely impossible to reach theoretically optimum conditions within the frame of the available process techniques, that is use of time, production volume and costs. Choice of proper equipment that could be used for various assignments is essential for an economically favourable result for the users of the mixing equipment. On the other hand, there are many different types of equipment that at first sight seem to be the same, on account of the many problems around mixing processes.
- the physical bulk properties of the powder materials change in a significant degree, depending on the size of the particles. If the mass has an average particle size of about 100 ⁇ m, the powder mass will usually behave as a free flowing mass with a defined slide angle, without tendency to cohesiveness. The mass will not acquire an inner strength after outside pressure, nor will it withstand greater pressure without break down. In order to obtain a successful mixture of such mass, it should be diffusive or convective.
- the powder mass will change character from a free flowing mass to a cohesive mass. It will then get an indefinite, but very large slide angle, which could also be negative, and it will acquire a relatively large strength after outside strain. Changes in the physical properties also show up in the fact that the powder get a significantly greater ability to form agglomerates, that is there will be large lumps that each consists of many small particles. The cause of this change in mass properties is that the interparticular forces that contribute to the tying together of the particles will be the dominating forces working in the powder when the particle size is reduced.
- Interparticular forces could be Van der Waal forces, electrostatic forces, chemical, magnetic or capillary forces. This means that the effects of the force of gravity would be less compared to these forces. As a result, the force of gravity will not by itself be able to break down the powder to single particles, which is necessary in order to obtain a good mixture at microlevels. The powder or agglomerates must thus be exposed to shearing .forces in the form of rubbing or high kinetic energy.
- the present invention supplies a possibility to supply to the powder mass shearing forces without the above mentioned draw backs. This is achieved by the method and mixing device according to the invention as they are defined with features set forth in the claims.
- the present invention achieves a number of advantages compared to the known art. Segregation properties are signi- ficantly improved on account of a fine distribution in the micro plane. Environmental improvements are achieved by the fact that the process can be trimmed very precisely so that smaller quantities of harmful materials are being used.
- FIG. 1 shows a cross section of a mixer with two rotors in an embodiment with rubbing wanes
- FIG. 2 shows a corresponding partial section with another embodiment of the rubbing wane
- Fig. 3 shows, corresponding to Fig. 2, a third embodiment of rubbing wanes
- Fig. 4 shows a plane view of the mixer in Fig. 1
- Fig. 5 shows an embodiment of a mixer where the rubbing process takes place against the mixer ' s end wall .
- special rubbing wanes 1, 4, 5 provided between regular wanes 3 which takes care of the transport and blending in the mixer's housing 6, it is achieved that the powder is broken down in several shearing planes, and that it therefore takes place a crushing of agglomerates at the same time as the mixing takes place at the micro plane.
- Rubbing wanes 1, 4, 5 rub, by rotation by the rotor 2, materials against the bottom wall against the housing 6, and thereby applies sufficient shearing forces that the bonds in the agglomerates are broken.
- the rubbing process can also be provided by the rubbing of the materials by rubbing wanes 7 against the end wall 8 of the housing 6, as shown in Fig. 5.
- Such a mixing process can be performed at low velocities, and therefore it is gentle to the powder mass.
- the method and the mixer device can be combined with other mixing prin- ciples, so that the three mechanisms for mixing can be utilised at the same time, since the mixing will take place by means of shearing in the micro plane while the entire mass of particles is stirred and mixed by means of diffusion and convection.
- a mixer ' s housing 6 for the embodiment of the method according to the present invention can make use of rubbing wanes 1, 4, 5 mounted on two parallel rotor 2 with opposite rotation direction, where the rubbing wanes press against a part of the powder mass and rub this against the stationary housing 6. This causes, because of the applied stress, that a number of breaks will occur in the powder mass. In the break plane it will, because of the shearing stresses, be a relative motion between each side of the break plane, and because of this motion, it will be a relative mass transport in the break zone itself.
- the method and mixing devices according to the present invention can be utilized in all processes comprising mixing of fine, cohesive powders where an active medium is to be evenly distributed in a mass of powder.
- Such tasks exist within several branches of industry, for example, in production of medicines, for mixing of pigments in raw materials for paint, chemical reactants and catalyzers, flourmixtures, coloured chalk, coal or binders, powders for toners and copying machines, etc.
- the method and the mixing device may also advantageously be used for mixing of small quantities of liquid in dry powders or for mixing of products in the paste form.
- the rubbing wanes can have the shape shown with the rubbing wane 1 in Fig. 1, which consists of a pipe which is bent in the form as shown in the Figure. Such bent rubbing wanes 1 in the form of pipes are fastened to the rotors 2, distributed over its length between the mixer' s mixing wanes 3.
- Fig. 2 shows another embodiment where the rubbing wanes 4 are bent so that the products are rubbed along rubbing wanes 4 while they are thrown radially outwardly.
- Fig. 3 shows on the other hand an embodiment of a rubbing wane 5 that has the form of an elliptic disc, also shaped such that the products will rub against the wall 6.
- the width of the rubbing wanes 1, 4, 5, 7 against the wall 6, 8 are chosen, depending on the materials to be mixed, and otherwise adapted to the special conditions.
- the rubbing wanes may be produced in the form of plates or pipes.
- the present invention has shown to provide specially good results for gentle mixers with low peripheral velocities, for example in the range from 0 to 3 m/s.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Accessories For Mixers (AREA)
- Detergent Compositions (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002283478A CA2283478A1 (en) | 1997-03-06 | 1998-03-06 | Mixer for cohesive powder materials |
JP53840698A JP2001513700A (en) | 1997-03-06 | 1998-03-06 | Mixer for sticky powder materials |
AU64249/98A AU6424998A (en) | 1997-03-06 | 1998-03-06 | Mixer for cohesive powder materials |
BR9808297-3A BR9808297A (en) | 1997-03-06 | 1998-03-06 | Method and mixer for cohesive powder materials |
EP98909881A EP1024889A1 (en) | 1997-03-06 | 1998-03-06 | Mixer for cohesive powder materials |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO971044A NO306242B1 (en) | 1997-03-06 | 1997-03-06 | Blends, especially for cohesive particulate materials |
NO971044 | 1997-03-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998039087A1 true WO1998039087A1 (en) | 1998-09-11 |
Family
ID=19900468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1998/000075 WO1998039087A1 (en) | 1997-03-06 | 1998-03-06 | Mixer for cohesive powder materials |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP1024889A1 (en) |
JP (1) | JP2001513700A (en) |
CN (1) | CN1138587C (en) |
AU (1) | AU6424998A (en) |
BR (1) | BR9808297A (en) |
CA (1) | CA2283478A1 (en) |
ID (1) | ID24467A (en) |
NO (1) | NO306242B1 (en) |
PL (1) | PL335511A1 (en) |
TR (1) | TR199902176T2 (en) |
WO (1) | WO1998039087A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014189384A3 (en) * | 2013-05-22 | 2015-04-02 | Multivector As | A method, a system and devices for processing at least one substance into a dried, fragmented, fluidized end product |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101492768B (en) * | 2008-01-23 | 2010-12-08 | 四川龙蟒矿冶有限责任公司 | High-efficiency method and equipment for homogeneous mixture of material |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0157915A2 (en) * | 1984-03-23 | 1985-10-16 | Inoue Seisakusho (Mfg) Co., Ltd. | Kneading machine |
AU6574686A (en) * | 1985-11-26 | 1987-05-28 | Lime Industries Pty Ltd | Improved storage reservoir for slurries and/or suspensions |
-
1997
- 1997-03-06 NO NO971044A patent/NO306242B1/en unknown
-
1998
- 1998-03-06 PL PL98335511A patent/PL335511A1/en unknown
- 1998-03-06 CN CNB988031442A patent/CN1138587C/en not_active Expired - Fee Related
- 1998-03-06 BR BR9808297-3A patent/BR9808297A/en unknown
- 1998-03-06 TR TR1999/02176T patent/TR199902176T2/en unknown
- 1998-03-06 WO PCT/NO1998/000075 patent/WO1998039087A1/en not_active Application Discontinuation
- 1998-03-06 ID IDW990958A patent/ID24467A/en unknown
- 1998-03-06 JP JP53840698A patent/JP2001513700A/en active Pending
- 1998-03-06 EP EP98909881A patent/EP1024889A1/en not_active Withdrawn
- 1998-03-06 CA CA002283478A patent/CA2283478A1/en not_active Abandoned
- 1998-03-06 AU AU64249/98A patent/AU6424998A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0157915A2 (en) * | 1984-03-23 | 1985-10-16 | Inoue Seisakusho (Mfg) Co., Ltd. | Kneading machine |
AU6574686A (en) * | 1985-11-26 | 1987-05-28 | Lime Industries Pty Ltd | Improved storage reservoir for slurries and/or suspensions |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 89; & JP,A,01 298 606 (HOSOKAWA MICRON CORP) 1 December 1989. * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014189384A3 (en) * | 2013-05-22 | 2015-04-02 | Multivector As | A method, a system and devices for processing at least one substance into a dried, fragmented, fluidized end product |
US10260803B2 (en) | 2013-05-22 | 2019-04-16 | Waister As | Method, a system and devices for processing at least one substance in a dried, fragmented, fluidized end product |
Also Published As
Publication number | Publication date |
---|---|
CN1138587C (en) | 2004-02-18 |
BR9808297A (en) | 2000-05-16 |
NO971044D0 (en) | 1997-03-06 |
JP2001513700A (en) | 2001-09-04 |
PL335511A1 (en) | 2000-04-25 |
EP1024889A1 (en) | 2000-08-09 |
TR199902176T2 (en) | 2000-06-21 |
ID24467A (en) | 2000-07-20 |
CN1249699A (en) | 2000-04-05 |
AU6424998A (en) | 1998-09-22 |
CA2283478A1 (en) | 1998-09-11 |
NO306242B1 (en) | 1999-10-11 |
NO971044L (en) | 1998-09-07 |
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