US3775863A - Method and apparatus for drying particulate materials - Google Patents

Method and apparatus for drying particulate materials Download PDF

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Publication number
US3775863A
US3775863A US00273647A US3775863DA US3775863A US 3775863 A US3775863 A US 3775863A US 00273647 A US00273647 A US 00273647A US 3775863D A US3775863D A US 3775863DA US 3775863 A US3775863 A US 3775863A
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Prior art keywords
air
vessel
temperature
screw
agitator
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US00273647A
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English (en)
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L Updegrove
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JH Day Co
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JH Day Co
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Assigned to LFB INC., A CORP. OF OH reassignment LFB INC., A CORP. OF OH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LEBLOND INCORPORATED
Assigned to DAY MIXING COMPANY reassignment DAY MIXING COMPANY CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JUNE 30, 1981. Assignors: LFB INC.
Assigned to J.H. DAY COMPANY reassignment J.H. DAY COMPANY CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JANUARY 28, 1987. Assignors: DAY MIXING COMPANY
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
    • 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
    • B01F27/95—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
    • B01F27/953—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis using only helical stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/402—Mixers using gas or liquid agitation, e.g. with air supply tubes comprising supplementary stirring elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/91—Heating or cooling systems using gas or liquid injected into the material, e.g. using liquefied carbon dioxide or steam
    • 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
    • B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
    • B01F27/1143—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections screw-shaped, e.g. worms
    • 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
    • B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
    • B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
    • B01F27/2324—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes planetary

Definitions

  • ABSTRACT A method and apparatus for drying a particulate material such as resin pellets, fine chemicals, pigments, cosmetic powders and the like.
  • the method involves mechanicallyagitating the material while sweeping it with pre-dried, heated air.
  • the preferred form of apparatus includes a frustoconical tank having an agitator screw which is rotated upon its own axis to lift material and is simultaneously orbited around the wall of the tank. Air or other gas which has been heated and dried is introduced at the bottom of the tank and flows upwardly through the material. The air, carrying with it moisture released by the material, is discharged at the top of the mixer.
  • the material can be mixed, granulated and dried in a single operation.
  • This invention relates to a method of, and apparatus for, drying materialsfsuch as textile resins, fine chemicals, pigments, pharmaceuticalsQpowdered metals and the like-
  • the invention is directed particularly to a method of drying materials to a very high degree of dryness, for example, to a final uum dryers have in the past proven to be the most ad-' vantageous.
  • the present invention is directed in partto a method of drying materials to a high degree of dryness in a-substantially shorter period of time than has heretofore been possible.
  • the present method is effective to dry Nylon 6 resin pellets from 2 percent to (1. 01 percent moistgre content in 4 hours, which represents a time saving of from 50 percent to 66 percent as compared to the best vacuum dryers, and a time saving of some 89 percent compared to other forms of commercial drying equipment.
  • -It is a further object of the present invention to provide a drying method which can be carried out in apparatus costing substantially less than vacuum drying ap-
  • the present drying method makes effective use of two driving forces.
  • the first force is heat transferred from the air to the product whichcauses water vapor' I vapor pressure as compared to the vapor pressure of paratus.
  • the apparatus required to practice the present invention is not only less expensive to install, but also costs substantially less to operate and maintain.
  • the present invention is predicated in part upon the concept of drying material by the combined action of mechanically agitating the material while sweeping it with a stream of hot pre-dried air or other gas.
  • the material is preferably agitated so that it flows both transversely of the airstream and in counter-.
  • This aspect of the present invention is-useful not only in drying'material to a high degree of dryness, but also in drying'material to a more moderate degree of dryness, for
  • the agitator revolves on its own axis in such a manner as to'lift the material from the bottom toward the top of the tank.
  • the tank is further provided with a porous air inlet connection adjacent to the lower portion of the tank wall.
  • Air is supplied to this inlet from a system including a pump, or compressor, which forces air through a dryer and a heater.
  • the air which is pre-dried to a low relative humidity enters the vessel at a temperature of from ambient temperature to 400 F. and at'a pressure less than 25 psi.
  • the air is preferably heated to a temperature close to the temperature at which it would heat the product to a point which would cause product deterioration.
  • the air pressure is sufflciently high to force the air upwardly through the material at a flow rate below the flow rate at which the material would spout.
  • the agitator moves through the material, it intermixes and granulates the material and continuously injects fresh material into the airstream.
  • the mixer not only shifts the material in a transverse or horizontal plane, but also causes vertical displacement of the material, the material being carried upwardly by the screw and then flowing downwardly, countercurrent to the airstream.
  • the hot, dry air transfers heat to the material in the tank, causing rapid evaporation which lowers the air temperature so that the air which has passed completely through the material and is discharged is moisture laden, relatively cool air at a temperature not substantially above the product temperature.
  • air is introduced at 270 F. and exits at 100 F. with product temperature being 97 F. and being substantially uniform throughout the tank.
  • both air exit temperature and product temperature increase during the drying cycle.
  • One of the principal advantages of the present apparatus is that optimum heat and moisture transfer is effected between the airstream and material.
  • the entering airstream is continuously brought into contact with fresh product so that no hot spot is developed.
  • the airstream passes through a relatively long path of product so it has ample contact to give up heat and pick up moisture. This again contributes to the overall efficiency of the operation resulting in the substantially decreased drying time required.
  • a further advantage of the present apparatus is that it is substantially less expensive than vacuum drying equipment not only from the point of view of initial investment, but is also much less expensive to operate and maintain.
  • Another advantage of the present apparatus is that it facilitates'drying and granulation and mixing in a single operation.
  • a still further advantage of the present apparatus is that it can be utilized to dry materials which are originally in a paste condition or in which the particles are originally moist and sticky.
  • mixer comprises a vessel, or
  • tank, 12 of generally inverted frustoconical configuraball and socket joint or the like, for supporting the following detailed description of the drawings illustrating a preferred embodiment of the invention.
  • FIG. 1 A preferred form of mixer 10 embodying the present invention is shown in FIG. 1 and a drying system 11 utilizing such a mixer is shown in schematic form in FIG.
  • a helical agitator screw 16 Joint 15 is located on the vertical center line of the vessel.
  • Agitator screw 16 includes a thin, helical plate 17 which is carried by an elongated shaft 18.
  • the lower end of shaft 18 is carried by joint 15, while the upper end of the shaft is joumalled in a suitable bearing carried by the outer end of radial support arm 20.
  • the inner end of support arm 20 is rotatably supported as at 21 in the center of a cover member 22.
  • a drive 23 is interconnected with arm 20 and shaft 18. This drive is effective to cause the arm 20 to revolve in a plane perpendicular to the axis of the tank at a relatively low speed, for example, two revolutions per minute.
  • Drive 23 is also effective to rotate shaft 18 about its own axis, at a substantially higher speed, for example, a speed of 64 revolutions per minute.
  • Shaft 18 is mounted so that it intersects the vertical center line of tank 10 at an angle equal to half of the vertical angle of the cone defined by the walls of tank 12.
  • the support arm 20 revolves in a horizontal plane and causes the shaft 18 to orbit, or generate a conical shape, so that the agitator screw moves around the inside surface of wall 12 and deflects material away from the wall toward the center of the tank.
  • the agitator screw is revolved about its own axis, i.e., the axis of shaft 18 so that material within the tank is carried upwardly by the screw from the bottom toward the top of the'tank.
  • mixer 10 includes a material discharge port adjacent to the lower end of the tank.
  • This discharge port may be connected to a discharge chute, such as chute l9, and the port may be opened or closed by a suitable valve, such as a sliding gate valve, rotating plug valve, or the like, the valve being operated by an actuator such as handle 25.
  • the cover 22 is provided with openings (not shown) for introducing material into the mixer and with a suitable air discharge filter 26 (shown in FIG. 3, but not shown in FIG. 1).
  • This filter which discharges moisture-laden air from the mixer, can either be vented to atmosphere directly or through an air conduit if desired. It will be understood that if a gas, such as nitrogen, is employed, it can be recycled through the heater and dryer if desired.
  • a lower portiom of the wall of tank 12 is provided with an air inlet port 27.
  • This port is covered with a porous plate 28 or other member for defusing the air stream entering the mixer to prevent high pressure localized air jets which would cause the material to spout.
  • a porous plate 28 or other member for defusing the air stream entering the mixer to prevent high pressure localized air jets which would cause the material to spout.
  • One suitable form of plate is a sintered stainless steel plate. Such plates are manufactured by Pall-Trinity Micro Corporation and are designated porous type PSS plates Grades D and E. The sizes of the holes in these plates are 35 microns and 65 microns, respectively.
  • the area surrounding air port 27 and plate 28 is enclosed by the walls of a duct-forming chamber 29. This chamber is connected to an air inlet conduit 30.
  • a complete drying system incorporatingmixer is dryers form no part of the present invention and since the construction is well known, it is considered unnecessary to describe the details of the dryer with particularity.
  • dryer 32 The inlet of dryer 32 is interconnected to compressor 31 by air conduit 33.
  • the dryer is also interconnected through conduit 35 and valve 36 to a heater 34.
  • heater 34 can be of any conventional type such as. an
  • ultra high degree of dryness refers to materials dried to'a very low moisture content of from, for example, 0.0] percent to 0.05 percent moisture.
  • An example of such materials would be textile resin pelletssuch as Nylon pellets. Pellets of other resins, such as Dacron and polyester polymers, also fall in this category.
  • the air supply provided by compressor or blower 31 is dried by dryer 32 to a very dry condition for example to a dew point of from 1 0F. to 40F., a preferred dryness being a dew point of 40F.
  • the temperature- may be frorn room temperatureto approximately 400F.
  • a preferred temperature is of the order of 200F. In any event, this air temperature can-be substantially above the critical maximum temperature for the material.
  • the air temperature may be approximately 300F.
  • This hot, dry air is introduced through chamber 29 and porous plate 28 into the bottom of the tank 12.
  • the air is preferably fed to the tank at a rate of from approximately one cubic foot of air per cubic foot of material to approximately 13 cubic feet of air per cubic foot of material per minute.
  • the pressure of air in chamber 29 is relatively low, e.g., less than 25 psi, and is preferably less than 10 psi.
  • the optimum pressure will vary with the size, density, etc., of the material being dried. in each case,.however, the air pressure is idized bed in the material and may be from one to two magnitudes less than the pressure which would create such a bed.
  • the hot dry air As the hot dry air enters the tank, it is continuously brought into contact with different material.
  • the hot air heats the materialand causes evaporation of the water from the material. This evaporation in turn causes the air temperature to be lowered.
  • the air As the air moves upwardly, it gives up heat and picks up moisture as it passes through an elongated conical column" of material which is being thoroughly agitated.
  • the air causes the temperature of the material to be raised in a very uniform fashion, i.e., there are not hot and cold spots,'and no more thah a nominal difference in temperature between different portions of the material.
  • the air When the air reaches the top of the level of material, the air has given up much of its heat and has absorbed a considerable amount of moisture.
  • the air in the illustration given exits through filter 25at a temperature of approximately 100 F.
  • the air is constantly being brought into contact with different portions of material so that the air' temperature is effectively utilized in vaporizing moisture without locally heating the material being dried to a temperature which would result in deterioration of the product.
  • the highly effective mixing action and air path provided in mixer 10 enables the use of air at a much higher temperature than the temperature at which the material deteriorates.
  • the present equipment is also advantageous for use in drying materials to a somewhat higher moisture'content, e.g., from 0.5 percent to 2 percent.
  • One of the principal advantages of the present systern in drying these materials is that three operations are performed on the material simultaneously. Specifically, the materials are mixed, granulated and dried simultaneously in one operation within the mixer. 10.Materials which can be treated in this manner. include fine chemicals, pigments and dye stuffs, cosmetic powders, various resins and the like.
  • the materials are introduced into the tank 12 and the drive 23 started to cause support arm 20 to revolve and to rotate agitator screw 16 upon its own axis.
  • air at a temperature from room temperature to 400 F. and with a dew point of from lO F. to 40 F. is introduced into the bottom of the tank through porous plate 28.
  • the air pressure is high enough to force air through the material, but is less than that which would cause spouting of the material.
  • the air temperature is less than the temperature which would elevate the material temperature high enough to cause deterioration of the prod.
  • the degree of the dryness of the air supplied is dependent in part upon the ultimate dryness required of the product and in part upon the economics of the process. For material which is to be dried to a lesser degree of dryness, e.g., 0.5 percent air at -l F. dew point can be employed. On the other hand, for some materi als which are to be dried to a high degree of dryness, or which are inherently difficult to dry, it may be desirable to utilize air at 40 F. dew point. While air having a dew point below 40 F. could be used, it is not usually economically attractive using presently available equipment. As the air and materials are intermixed in the tank, the solid materials are mixed and granulated.
  • the hot, dry air which is constantly being brought into contact with different portions of the material effects an optimum heat transfer of the material to cause the moisture in the material to be vaporized and carried off by the swept air.
  • the air and entrained moisture are discharged through filter 26.
  • the present method can be carried out utilizing different apparatus from the preferred form of apparatus shown.
  • apparatus can include a tank having a conical bottom and cylindrical side walls of the type shown in Nauta US. Pat. No. 2,345,063.
  • the mixer can include an agitator screw of conical configuration or can include twin agitators.
  • the upper end of the agitator screw can be shifted in a horizontal plane with a compound motion including a radial component as shown in Fox U.S. Pat. No. 3,338,562. Therefore, I desire to be limited only by the scope of the following claims.
  • a method of simultaneously mixing granulating and drying material comprising the steps of:
  • a device for simultaneously granulating and drying material comprising:
  • a mixing vessel having a frustoconical side wall taper ing inwardly toward a bottom wall
  • a system for drying materials comprising: I
  • a mixing vessel having a frustoconical side wall tapering inwardly toward a bottom wall
  • conduit means interconnecting said air heater and said air inlet.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US00273647A 1972-07-20 1972-07-20 Method and apparatus for drying particulate materials Expired - Lifetime US3775863A (en)

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US27364772A 1972-07-20 1972-07-20

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JP (1) JPS49132650A (enrdf_load_stackoverflow)
BE (1) BE802103A (enrdf_load_stackoverflow)
CH (1) CH555522A (enrdf_load_stackoverflow)
DE (1) DE2335577A1 (enrdf_load_stackoverflow)
ES (1) ES417522A1 (enrdf_load_stackoverflow)
FR (1) FR2194297A5 (enrdf_load_stackoverflow)
GB (1) GB1435156A (enrdf_load_stackoverflow)
IT (1) IT991278B (enrdf_load_stackoverflow)
NL (1) NL7309372A (enrdf_load_stackoverflow)
ZA (1) ZA734943B (enrdf_load_stackoverflow)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913238A (en) * 1972-07-20 1975-10-21 Day J H Co Method and apparatus for drying particulate materials
US4101116A (en) * 1975-10-08 1978-07-18 Motan Gesellschaft Mit Beschrankter Haftung Apparatus for mixing granulated and/or pulverous materials
US4127333A (en) * 1976-04-09 1978-11-28 Instytut Chemii Przemslowej Continuously operated cone-and-screw mixer
US4159580A (en) * 1977-11-25 1979-07-03 Welch Jr Richard Grain drying bin
US4534658A (en) * 1983-06-06 1985-08-13 Isem B.V. Mixing apparatus, having seals which may be satisfactorily cleaned, particularly for the pharmaceutical industry
US4588301A (en) * 1982-06-29 1986-05-13 Alfred Bolz Conical screw mixer
US4668099A (en) * 1985-04-11 1987-05-26 Alfred Bolz Conical spiral mixer with spherical sealing body in the bottom opening
US4734149A (en) * 1987-03-20 1988-03-29 Warner-Lambert Company Apparatus for heatsealing gelatin capsules containing a medicament
US4915506A (en) * 1987-09-10 1990-04-10 Hosokawa Micron Europe B.V. Apparatus for drying material which is mixed with a solvent
US4980029A (en) * 1988-01-23 1990-12-25 Alfred Bolz Gmbh & Co. Kg Apparatus for treating waste materials
US5123748A (en) * 1989-07-07 1992-06-23 N.V. Machinefabriek Terlet Mixing device with central thermal element
DE4103455A1 (de) * 1991-02-06 1992-08-13 Krauss Maffei Ag Mischertrockner
US5649765A (en) * 1996-05-07 1997-07-22 Littleford Day, Inc. Conical mixer apparatus with contamination-preventing orbit arm assembly
US5709036A (en) * 1995-05-17 1998-01-20 Haleen; Len W. Aggressive convective drying in a conical screw type mixer/dryer
US6065223A (en) * 1993-08-23 2000-05-23 Gode; Gabor Device utilizing solar energy, especially for drying and roasting of agricultural-, as well as food processing products, finalizing distillation and evaporation, separating of complicated compounds
EP1068802A3 (de) * 1999-07-16 2003-10-01 Emmerich Tetkov Anlage und Verfahren zum Trocknen wärmeempfindlicher Güter
US20080094934A1 (en) * 2006-10-20 2008-04-24 Win-Chin Chiang Conical screw blender
US20080095752A1 (en) * 2006-10-20 2008-04-24 Win-Chin Chiang Method for extending the shelf-life of powdered nutritional formulations which contain viable probiotics
ITMI20081222A1 (it) * 2008-07-03 2010-01-04 D C M Delta Costruzioni Meccaniche S R L Macchina per l'essecazione sotto vuoto di materiali pulverulenti dotata di sistema di immissione di azoto o altro gas inerte nella camera di essicazione.
US7908765B2 (en) * 2006-12-22 2011-03-22 Collette Nv Continuous granulating and drying apparatus
CN103759512A (zh) * 2014-01-07 2014-04-30 合肥杰事杰新材料股份有限公司 一种鼓风干燥机
CN105004156A (zh) * 2015-07-23 2015-10-28 合肥维巧食品科技有限公司 一种山茶的烘干装置
CN106732141A (zh) * 2016-12-29 2017-05-31 深圳市玖创科技有限公司 一种具有除磁装置的电池负极材料混合设备
CN113144975A (zh) * 2021-04-20 2021-07-23 王正龙 一种防晒霜的制备装置
US20220305448A1 (en) * 2020-07-21 2022-09-29 Hefei General Machinery Research Institute Co., Ltd Integrated production system for ternary material
CN117504707A (zh) * 2024-01-05 2024-02-06 泉州市精翔智能装备科技有限公司 一种粉体助剂配送设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2729015C3 (de) * 1977-06-28 1983-11-03 Lupofresh Allfeld & Egloff, 8500 Nürnberg Nachtrocknen von Hopfengut
DE2818863C3 (de) * 1978-04-26 1981-04-30 Schering Ag Berlin Und Bergkamen, 1000 Berlin Trocknungsvorrichtung
JPH0618212Y2 (ja) * 1987-12-11 1994-05-11 神鋼パンテック株式会社 粉粒体乾燥装置
EP2722103A3 (de) * 2012-10-19 2015-06-03 Harald Kniele Zwangsmischer mit Selbstreinigungsfunktion und Verwendung von Lufteinlässen hierfür

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345063A (en) * 1939-11-13 1944-03-28 Nauta Johannes Ewardus Mixing apparatus, especially adapted for mixing pulverized materials
US2668764A (en) * 1949-10-14 1954-02-09 Johannes E Nauta Method and device for conching a chocolate mass and the like
US3618070A (en) * 1969-07-03 1971-11-02 Bell & Howell Comm Co Vibratory alerting devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345063A (en) * 1939-11-13 1944-03-28 Nauta Johannes Ewardus Mixing apparatus, especially adapted for mixing pulverized materials
US2668764A (en) * 1949-10-14 1954-02-09 Johannes E Nauta Method and device for conching a chocolate mass and the like
US3618070A (en) * 1969-07-03 1971-11-02 Bell & Howell Comm Co Vibratory alerting devices

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913238A (en) * 1972-07-20 1975-10-21 Day J H Co Method and apparatus for drying particulate materials
US4101116A (en) * 1975-10-08 1978-07-18 Motan Gesellschaft Mit Beschrankter Haftung Apparatus for mixing granulated and/or pulverous materials
US4127333A (en) * 1976-04-09 1978-11-28 Instytut Chemii Przemslowej Continuously operated cone-and-screw mixer
US4159580A (en) * 1977-11-25 1979-07-03 Welch Jr Richard Grain drying bin
US4588301A (en) * 1982-06-29 1986-05-13 Alfred Bolz Conical screw mixer
US4534658A (en) * 1983-06-06 1985-08-13 Isem B.V. Mixing apparatus, having seals which may be satisfactorily cleaned, particularly for the pharmaceutical industry
US4668099A (en) * 1985-04-11 1987-05-26 Alfred Bolz Conical spiral mixer with spherical sealing body in the bottom opening
US4734149A (en) * 1987-03-20 1988-03-29 Warner-Lambert Company Apparatus for heatsealing gelatin capsules containing a medicament
US4915506A (en) * 1987-09-10 1990-04-10 Hosokawa Micron Europe B.V. Apparatus for drying material which is mixed with a solvent
US4980029A (en) * 1988-01-23 1990-12-25 Alfred Bolz Gmbh & Co. Kg Apparatus for treating waste materials
US5123748A (en) * 1989-07-07 1992-06-23 N.V. Machinefabriek Terlet Mixing device with central thermal element
DE4103455A1 (de) * 1991-02-06 1992-08-13 Krauss Maffei Ag Mischertrockner
US5255444A (en) * 1991-02-06 1993-10-26 Krauss-Maffei Aktiengesellschaft Microwave drying/mixing apparatus
US6065223A (en) * 1993-08-23 2000-05-23 Gode; Gabor Device utilizing solar energy, especially for drying and roasting of agricultural-, as well as food processing products, finalizing distillation and evaporation, separating of complicated compounds
US5709036A (en) * 1995-05-17 1998-01-20 Haleen; Len W. Aggressive convective drying in a conical screw type mixer/dryer
US5649765A (en) * 1996-05-07 1997-07-22 Littleford Day, Inc. Conical mixer apparatus with contamination-preventing orbit arm assembly
EP1068802A3 (de) * 1999-07-16 2003-10-01 Emmerich Tetkov Anlage und Verfahren zum Trocknen wärmeempfindlicher Güter
US20080094934A1 (en) * 2006-10-20 2008-04-24 Win-Chin Chiang Conical screw blender
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US7387427B2 (en) 2006-10-20 2008-06-17 Bristol-Myers Squibb Company Method for blending heat-sensitive material using a conical screw blender with gas injection
US7908765B2 (en) * 2006-12-22 2011-03-22 Collette Nv Continuous granulating and drying apparatus
ITMI20081222A1 (it) * 2008-07-03 2010-01-04 D C M Delta Costruzioni Meccaniche S R L Macchina per l'essecazione sotto vuoto di materiali pulverulenti dotata di sistema di immissione di azoto o altro gas inerte nella camera di essicazione.
CN103759512A (zh) * 2014-01-07 2014-04-30 合肥杰事杰新材料股份有限公司 一种鼓风干燥机
CN105004156A (zh) * 2015-07-23 2015-10-28 合肥维巧食品科技有限公司 一种山茶的烘干装置
CN106732141A (zh) * 2016-12-29 2017-05-31 深圳市玖创科技有限公司 一种具有除磁装置的电池负极材料混合设备
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CN113144975A (zh) * 2021-04-20 2021-07-23 王正龙 一种防晒霜的制备装置
CN117504707A (zh) * 2024-01-05 2024-02-06 泉州市精翔智能装备科技有限公司 一种粉体助剂配送设备
CN117504707B (zh) * 2024-01-05 2024-04-02 泉州市精翔智能装备科技有限公司 一种粉体助剂配送设备

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BE802103A (fr) 1974-01-09
DE2335577A1 (de) 1974-01-31
IT991278B (it) 1975-07-30
JPS49132650A (enrdf_load_stackoverflow) 1974-12-19
CH555522A (de) 1974-10-31
FR2194297A5 (enrdf_load_stackoverflow) 1974-02-22
ZA734943B (en) 1974-06-26
GB1435156A (en) 1976-05-12
NL7309372A (enrdf_load_stackoverflow) 1974-01-22
ES417522A1 (es) 1976-06-16

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