[go: up one dir, main page]

EP0351125A1 - Apparatus for mixing and dispersing materials - Google Patents

Apparatus for mixing and dispersing materials Download PDF

Info

Publication number
EP0351125A1
EP0351125A1 EP89306819A EP89306819A EP0351125A1 EP 0351125 A1 EP0351125 A1 EP 0351125A1 EP 89306819 A EP89306819 A EP 89306819A EP 89306819 A EP89306819 A EP 89306819A EP 0351125 A1 EP0351125 A1 EP 0351125A1
Authority
EP
European Patent Office
Prior art keywords
vessel
rotors
series
cage
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89306819A
Other languages
German (de)
French (fr)
Inventor
Colin Frederick Bow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Netzsch Mastermix Ltd
Original Assignee
Netzsch Mastermix Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Netzsch Mastermix Ltd filed Critical Netzsch Mastermix Ltd
Publication of EP0351125A1 publication Critical patent/EP0351125A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • B01F27/05—Stirrers
    • B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
    • B01F27/091—Stirrers characterised by the mounting of the stirrers with respect to the receptacle with elements co-operating with receptacle wall or bottom, e.g. for scraping the receptacle wall
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/84—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with two or more stirrers rotating at different speeds or in opposite directions about the same axis
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/93—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary discs
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements

Definitions

  • This invention relates to apparatus for mixing and dispensing particulate materials in solvent liquids, especially but not exclusively in the manufacture of paints by incorporating opacifiers and pigments in the solvents
  • a successful prior art apparatus comprises a cylindrical vessel having a slow speed rotor with a blade generally of the shape and size of the vessel so as to closely conform to the vessel side wall and which is for maintaining a general mixing or circulating flow in the vessel contents, together with one or more high speed rotor discs for dispersion, which is effected by the shearing forces provided by the acceleration of the material due to the high speed rotor.
  • the economic considerations of the mixing and dispersing apparatus include energy input and time taken (which are in general related) but limiting factors include heat evolution which may be deleterious to some materials which are to be mixed as well as representing energy loss.
  • the object of the invention is to provide improved apparatus.
  • mixing and dispersing apparatus having a main rotor shaft provided with a series of axially spaced rotors of progressively greater effective diameter along the length of the shaft.
  • the rotors may be driven at constant speed, or e.g. at variable speeds according to the stage in the mixing and dispersion cycle.
  • the stacked rotor assembly of the present invention may be used in a container or vessel arranged for a natural circulation or flow within the vessel or it may be arranged for flow through the vessel, that is to say from an inlet past the rotors to an outlet with continuous flow therethrough, possibly with recirculation via an external passage.
  • the vessel may be of generally the same cross sectional shape as the stacked rotor assembly giving the possibility of shearing forces being created by flow between the rotor discs and the vessel wall.
  • the stacked rotor assembly is associated with a cage which is generally complementary in shape to the stacked rotors, so that acceleration and shear forces are created between the cage and the rotor tips.
  • the cage may be complementary to the vessel shape or not. This also creates the possibility of using a vessel of more complex shape and of arranging for the rotor assembly with or without cage to be movable relative to the vessel so as to operate in different portions of the vessel to different effects at different times.
  • the cage is water-cooled.
  • Overhung shaft 16 extends generally axially of the vessel from a motor 18 at the top through a seal 20, and carries a series of (in this instance) five rotor discs 22 - 30 which are of progressively larger diameter from the free end towards the motor so that there is a generally similar clearance between the tip of each rotor and the vessel wall.
  • the solvents and pigment may be fed through common or separate supply means via inlet 12, and circulated via a passage connecting outlet 14 with inlet 12 or for example solvent can be pumped continuously through the inlet 12 and out of the outlet 40 and from time to time pigments, and opacifiers and the like charged into the vessel at any suitable point.
  • the arrangement of Figure 1 can run continuously whilst circulating a single batch, or continuously producing completely mixed and dispersed product.
  • the materials are subject to increasing acceleration due to the series of discs of progressively larger diameter, and all of which are inherently driven at the same rotary speed and hence higher tip speed, so that the material is subject to a series of increasing shearing forces at the tips.
  • the arrangement is more primarily concerned for batch production and the vessel 101 has a frusto-conical lower portion 30 and a generally cylindrical upper portion 32.
  • the stacked rotor assembly carried by shaft 161 is designed to be raised and lowered, i.e. moved in the direction of the arrows AA relative to the vessel.
  • the shaft 16 is again overhung, and the vessel is provided with ports 121 and 141 at the bottom and top respectively.
  • the vessel may be charged with solvent for example through the port 141 and particulate material may be vacuum induced in the vessel through the port 121. Alternatively and for example, the particulate material may be charged through the port 141.
  • FIG. 3 is a further version primarily arranged for batch production like Figure 2 but in this case the stacked rotor set driven by the overdrive shaft 162 is associated with a cage 36 carried by a stationary guide member 38, and the shearing forces applied to the material are due to the flow of the material between the rotor disc peripheries and the cage portions 40.
  • the whole assembly of cage and rotors is vertically movable relative to the vessel.
  • Figure 3 also shows the use of a slow speed stirring rotor 42 which in this instance is underdriven from shaft 44 via gearbox 46.
  • the shaft 44 may be a hollow one providing for vacuum induction of particulate material via the valve 48.
  • the cage is cooled, for example water-­cooled and coolant may be delivered to the cage via pipes 41,43 extending through a non-rotating sleeve 45 journalling the drive shaft 162.
  • coolant may be delivered to the cage via pipes 41,43 extending through a non-rotating sleeve 45 journalling the drive shaft 162.
  • the arrangement shown in Figure 4 differs from that in Figure 3 in that the slow speed rotor 421 is overdrive instead of being underdriven.
  • the whole rotor assembly may be raised and lowered.
  • the effect on the product will be varied by so doing.
  • the effect (of raising) will be to reduce the shear forces effect from the lower rotors because of the increased space from the vessel wall, and hence produce a more general stirring effect.
  • the arrangement in Figure 5 is generally similar to that in Figure 1 but in this case the arrangement includes a series of fixed baffles 50 interposed between the successive rotors and extending from the container walls towards the shaft. The effect of these is to cause an extended flow path for the whole of the material in flow from the inlet to the outlet so that it reverses direction radially and is subject to shearing forces in flow not only between the rotor tip and the container wall but also between the rotor and each of the baffles.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

Mixing and dispersing apparatus shown in Figure 1 has a series of rotors (22, 30) of different diameter carried by and driven by a main rotor shaft (10) and located in a vessel having at a least a portion shape (10) generally complimentary to that of the set of rotors. Material in the vessel which is circulating in the vessel or flowing through the vessel is subject to a series of accelerations and shearing forces in flow between each rotor tip and the vessel wall.

Description

  • This invention relates to apparatus for mixing and dispensing particulate materials in solvent liquids, especially but not exclusively in the manufacture of paints by incorporating opacifiers and pigments in the solvents
  • A successful prior art apparatus comprises a cylindrical vessel having a slow speed rotor with a blade generally of the shape and size of the vessel so as to closely conform to the vessel side wall and which is for maintaining a general mixing or circulating flow in the vessel contents, together with one or more high speed rotor discs for dispersion, which is effected by the shearing forces provided by the acceleration of the material due to the high speed rotor.
  • The economic considerations of the mixing and dispersing apparatus include energy input and time taken (which are in general related) but limiting factors include heat evolution which may be deleterious to some materials which are to be mixed as well as representing energy loss.
  • The object of the invention is to provide improved apparatus.
  • According to a first broader aspect of the invention, we provide mixing and dispersing apparatus having a main rotor shaft provided with a series of axially spaced rotors of progressively greater effective diameter along the length of the shaft.
  • The rotors may be driven at constant speed, or e.g. at variable speeds according to the stage in the mixing and dispersion cycle.
  • By these means, in general, it is possible to bring about circulation in the vessel or flow through the vessel without using a slow speed rotor. However a slow speed rotor may also be used in the arrangements of the invention. The series of axially spaced rotors, acting on the vessel contents in its flow within the vessel subjects the material to a series of accelerations and shearing forces, and where the flow is from the smaller diameter rotor to the larger diameter rotor, these shearing forces will be of progressively greater effect. It is believed that this will enable high energy inputs but avoiding problems therefrom.
  • The stacked rotor assembly of the present invention may be used in a container or vessel arranged for a natural circulation or flow within the vessel or it may be arranged for flow through the vessel, that is to say from an inlet past the rotors to an outlet with continuous flow therethrough, possibly with recirculation via an external passage.
  • The vessel may be of generally the same cross sectional shape as the stacked rotor assembly giving the possibility of shearing forces being created by flow between the rotor discs and the vessel wall.
  • Alternatively and according to a feature of the invention, the stacked rotor assembly is associated with a cage which is generally complementary in shape to the stacked rotors, so that acceleration and shear forces are created between the cage and the rotor tips. In this case the cage may be complementary to the vessel shape or not. This also creates the possibility of using a vessel of more complex shape and of arranging for the rotor assembly with or without cage to be movable relative to the vessel so as to operate in different portions of the vessel to different effects at different times. According to an important preferred feature, the cage is water-cooled.
  • The invention is further described with reference to the accompanying drawings in which each of the five figures is a diagrammatic elevation of a different embodiment.
  • Referring first to Figure 1, the arrangement there comprises a vessel 10 which is generally conical and has a bottom inlet 12 and a top outlet 14. Overhung shaft 16 extends generally axially of the vessel from a motor 18 at the top through a seal 20, and carries a series of (in this instance) five rotor discs 22 - 30 which are of progressively larger diameter from the free end towards the motor so that there is a generally similar clearance between the tip of each rotor and the vessel wall.
  • The solvents and pigment may be fed through common or separate supply means via inlet 12, and circulated via a passage connecting outlet 14 with inlet 12 or for example solvent can be pumped continuously through the inlet 12 and out of the outlet 40 and from time to time pigments, and opacifiers and the like charged into the vessel at any suitable point. In short the arrangement of Figure 1 can run continuously whilst circulating a single batch, or continuously producing completely mixed and dispersed product.
  • In flow from the inlet 12 to the outlet 14, the materials are subject to increasing acceleration due to the series of discs of progressively larger diameter, and all of which are inherently driven at the same rotary speed and hence higher tip speed, so that the material is subject to a series of increasing shearing forces at the tips.
  • In Figure 2, the arrangement is more primarily concerned for batch production and the vessel 101 has a frusto-conical lower portion 30 and a generally cylindrical upper portion 32. The stacked rotor assembly carried by shaft 161 is designed to be raised and lowered, i.e. moved in the direction of the arrows AA relative to the vessel. The shaft 16 is again overhung, and the vessel is provided with ports 121 and 141 at the bottom and top respectively. The vessel may be charged with solvent for example through the port 141 and particulate material may be vacuum induced in the vessel through the port 121. Alternatively and for example, the particulate material may be charged through the port 141.
  • The arrangement shown in Figure 3 is a further version primarily arranged for batch production like Figure 2 but in this case the stacked rotor set driven by the overdrive shaft 162 is associated with a cage 36 carried by a stationary guide member 38, and the shearing forces applied to the material are due to the flow of the material between the rotor disc peripheries and the cage portions 40. The whole assembly of cage and rotors is vertically movable relative to the vessel.
  • Figure 3 also shows the use of a slow speed stirring rotor 42 which in this instance is underdriven from shaft 44 via gearbox 46. The shaft 44 may be a hollow one providing for vacuum induction of particulate material via the valve 48.
  • Preferably the cage is cooled, for example water-­cooled and coolant may be delivered to the cage via pipes 41,43 extending through a non-rotating sleeve 45 journalling the drive shaft 162. The arrangement shown in Figure 4 differs from that in Figure 3 in that the slow speed rotor 421 is overdrive instead of being underdriven.
  • At least in the case of Figures 2-3 the whole rotor assembly may be raised and lowered. The effect on the product will be varied by so doing. In the case of Figure 2 the effect (of raising) will be to reduce the shear forces effect from the lower rotors because of the increased space from the vessel wall, and hence produce a more general stirring effect.
  • The arrangement in Figure 5 is generally similar to that in Figure 1 but in this case the arrangement includes a series of fixed baffles 50 interposed between the successive rotors and extending from the container walls towards the shaft. The effect of these is to cause an extended flow path for the whole of the material in flow from the inlet to the outlet so that it reverses direction radially and is subject to shearing forces in flow not only between the rotor tip and the container wall but also between the rotor and each of the baffles.

Claims (8)

1. Mixing and dispersing apparatus comprising a vessel and a main rotor shaft provided with a series of axially spaced rotors of progressively greater effective diameter along the length of the shaft.
2. Apparatus as claimed in Claim 1 wherein the vessel comprises a conical portion concentric to the axis of the main rotor shaft.
3. Apparatus as claimed in Claim 2 wherein the vessel has an inlet at the small end of the cone adjacent to the smallest of the series of rotors and an outlet at the large end of the cone adjacent the largest of the series of rotors.
4. Apparatus as claimed in Claim 1 wherein the vessel comprises a cylindrical portion and a conical portion, the said rotor shaft extends axially of the two portions and is displaceable axially to take the set of rotors into and out of the conical portion of the vessel.
5. Apparatus as claimed in Claim 1 wherein a cage surrounds the said series of rotors and the rotors are rotatable relative to said cage.
6. Apparatus as claimed in any proceeding Claim wherein a slow speed rotor comprising one or more blades closely conforming to the wall of the vessel is located between the same and the said series of spaced rotors.
7. Apparatus as claimed in Claim 1 comprising a series of fixed baffles each interposed between two adjacent rotors and mounted on the wall of the vessel and extending towards said shaft.
8. Apparatus as claimed in Claim 5 wherein said cage is water-cooled.
EP89306819A 1988-07-15 1989-07-05 Apparatus for mixing and dispersing materials Withdrawn EP0351125A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8816890 1988-07-15
GB888816890A GB8816890D0 (en) 1988-07-15 1988-07-15 Apparatus for mixing & dispersing materials

Publications (1)

Publication Number Publication Date
EP0351125A1 true EP0351125A1 (en) 1990-01-17

Family

ID=10640518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89306819A Withdrawn EP0351125A1 (en) 1988-07-15 1989-07-05 Apparatus for mixing and dispersing materials

Country Status (4)

Country Link
EP (1) EP0351125A1 (en)
DK (1) DK343389A (en)
GB (2) GB8816890D0 (en)
PT (1) PT91168A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2132725C1 (en) * 1997-06-24 1999-07-10 Кемеровский технологический институт пищевой промышленности Centrifugal mixer
DE19811112A1 (en) * 1998-03-13 1999-09-16 Speedform Gmbh Apparatus and method for mixing a quick-hardening embedding mass for production of molds for metal casting
RU2191063C1 (en) * 2001-01-31 2002-10-20 Кемеровский технологический институт пищевой промышленности Centrifugal mixer
WO2007129340A1 (en) * 2006-05-10 2007-11-15 Comber S.R.L. Conical-base drier
JP2014223581A (en) * 2013-05-16 2014-12-04 株式会社井上製作所 Low shear type concentric biaxial mixer
CN105480655A (en) * 2015-12-04 2016-04-13 宜兴天山水泥有限责任公司 Cement conveying system
EP3065552A4 (en) * 2013-11-08 2017-07-26 Sanso Förvaltning AB Kneading device
KR20200038194A (en) * 2018-10-02 2020-04-10 아사다텍코 가부시키가이샤 Mixing device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577675A (en) * 1995-01-25 1996-11-26 Mitsui Mining Co., Ltd. Agitating pulverizer
US6012473A (en) * 1998-03-18 2000-01-11 Takehiko Koyama Fluid mixer and roller cleaner
RU2162409C1 (en) * 1999-07-29 2001-01-27 Яшин Александр Михайлович Mixer
DE102011006636A1 (en) * 2011-04-01 2012-10-04 Harald Kniele Pug mill mixer i.e. concrete mixer, for use in construction site for mixing liquid, powdery and/or granular components, has vibrating device coupled to shaft and actuated to simulate shaft for enabling vibration movements
JP6725504B2 (en) * 2015-07-01 2020-07-22 住友重機械プロセス機器株式会社 Stirrer

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB378841A (en) * 1932-02-20 1932-08-18 Albert Henkel Improvements in and relating to mixing and stirring machines
US2163150A (en) * 1937-08-14 1939-06-20 Sinclair Refining Co Oil refining apparatus
US2315251A (en) * 1941-06-25 1943-03-30 Edwin G Eppenbach Combination mixer
US3010803A (en) * 1956-06-21 1961-11-28 Shell Oil Co Fluid mixer with rotating baffles
US3158358A (en) * 1963-03-11 1964-11-24 Patterson Kelley Co Materials blending machine
US3172609A (en) * 1960-11-03 1965-03-09 Kaiser Aluminium Chem Corp Apparatus for disintegrating aggregates of solid material
FR1525094A (en) * 1966-04-18 1968-05-17 Method and device for the preparation of cement and concrete mortar
DE2446975A1 (en) * 1974-10-02 1976-04-15 Hoechst Ag Plant for processing viscous or granular materials - e.g. for drying mixing de-odorising degassing, polymerisation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB270656A (en) * 1926-05-10 1928-02-02 Societe Chimique Des Usines Du Rhone
GB1037665A (en) * 1962-08-31 1966-08-03 Unilever Ltd Mixing device
US3268213A (en) * 1964-06-08 1966-08-23 Charles F Cala Apparatus for homogenizing glass

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB378841A (en) * 1932-02-20 1932-08-18 Albert Henkel Improvements in and relating to mixing and stirring machines
US2163150A (en) * 1937-08-14 1939-06-20 Sinclair Refining Co Oil refining apparatus
US2315251A (en) * 1941-06-25 1943-03-30 Edwin G Eppenbach Combination mixer
US3010803A (en) * 1956-06-21 1961-11-28 Shell Oil Co Fluid mixer with rotating baffles
US3172609A (en) * 1960-11-03 1965-03-09 Kaiser Aluminium Chem Corp Apparatus for disintegrating aggregates of solid material
US3158358A (en) * 1963-03-11 1964-11-24 Patterson Kelley Co Materials blending machine
FR1525094A (en) * 1966-04-18 1968-05-17 Method and device for the preparation of cement and concrete mortar
DE2446975A1 (en) * 1974-10-02 1976-04-15 Hoechst Ag Plant for processing viscous or granular materials - e.g. for drying mixing de-odorising degassing, polymerisation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2132725C1 (en) * 1997-06-24 1999-07-10 Кемеровский технологический институт пищевой промышленности Centrifugal mixer
DE19811112A1 (en) * 1998-03-13 1999-09-16 Speedform Gmbh Apparatus and method for mixing a quick-hardening embedding mass for production of molds for metal casting
RU2191063C1 (en) * 2001-01-31 2002-10-20 Кемеровский технологический институт пищевой промышленности Centrifugal mixer
WO2007129340A1 (en) * 2006-05-10 2007-11-15 Comber S.R.L. Conical-base drier
JP2014223581A (en) * 2013-05-16 2014-12-04 株式会社井上製作所 Low shear type concentric biaxial mixer
EP3065552A4 (en) * 2013-11-08 2017-07-26 Sanso Förvaltning AB Kneading device
US10004238B2 (en) 2013-11-08 2018-06-26 Sanso Forvaltning Ab Kneading device for post-working of a product
CN105480655A (en) * 2015-12-04 2016-04-13 宜兴天山水泥有限责任公司 Cement conveying system
KR20200038194A (en) * 2018-10-02 2020-04-10 아사다텍코 가부시키가이샤 Mixing device

Also Published As

Publication number Publication date
GB8915294D0 (en) 1989-08-23
GB8816890D0 (en) 1988-08-17
DK343389D0 (en) 1989-07-11
DK343389A (en) 1990-01-16
GB2220585A (en) 1990-01-17
PT91168A (en) 1990-02-08

Similar Documents

Publication Publication Date Title
EP0351125A1 (en) Apparatus for mixing and dispersing materials
US6000840A (en) Rotors and stators for mixers and emulsifiers
US5934579A (en) Apparatus for treating suspensions
US4496106A (en) Agitator-grinder
US2882149A (en) Flow apparatus for the continuous physical and/or chemical treatment of substances
US3027102A (en) Apparatus for mixing and comminuting
KR20110058721A (en) Stirrer Ball Mill
US5597126A (en) Stirred ball mill
US3533566A (en) Stirrer-ball mill
KR102501892B1 (en) Agitator ball mill
EP0743091A1 (en) Basket media mill with extended impeller
US7275704B2 (en) Compound dispersing method and apparatus
US4650343A (en) Method of mixing or drying particulate material
US3845938A (en) Apparatus for dispersing finely divided solid particles in a liquid vehicle
KR100494851B1 (en) Stirring Mill
CN105274893B (en) For handling the equipment of material
US5897068A (en) Agitator mill
US6402069B1 (en) Comminution machine with an emulsifier
US4848919A (en) Pinned mill for mixers
JP3676806B2 (en) Method and apparatus for mixing fluid into pulp suspension
US6565024B2 (en) Dispersing device
US4197019A (en) Dual drive co-axial disperser
US3813083A (en) Fluid propeller
US4754437A (en) Method of making or drying particulate material
US6325310B1 (en) Immersion-type dispersing apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19900718