US3117027A - Apparatus for coating particles in a fluidized bed - Google Patents
Apparatus for coating particles in a fluidized bed Download PDFInfo
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- US3117027A US3117027A US1298A US129860A US3117027A US 3117027 A US3117027 A US 3117027A US 1298 A US1298 A US 1298A US 129860 A US129860 A US 129860A US 3117027 A US3117027 A US 3117027A
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- coating
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J3/00—Devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms
- A61J3/005—Coating of tablets or the like
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
- A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S159/00—Concentrating evaporators
- Y10S159/03—Fluidized bed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S159/00—Concentrating evaporators
- Y10S159/21—Coating
Definitions
- the present invention relates to the coating art and more specifically to'improvementsin the air suspension coating process.
- This process and illustrative apparatus for carrying out the process are described in Wurster Patent 2,648,609 and also in the copending Wurster application'Serial No. 810,128, filed April 30, 1959.
- the particles to be coated e.g. tablets, crystals,-powders and the like
- a moving gas stream e.g. an air stream
- the-coating composition in atomized or like form is introduced into the gas stream pnior to its contact with the suspended particles to be coated.
- a cyclonic inducer described below; between the coating and settling sections of the tower.
- the cyclonic inducer directs the particles leaving the coating section in such a manner that their momentum is reduced by being thrown against the outside of the settling section. In doing so they also impinge against returning particles causing a further substantial reduction of the upward or escape momentum.
- the location of the cyclonic inducer is such that it acts to support par-t of the material in the settling section and automatically feeds it back into the coating section at a uniform rate. This aids inmaintaining .an optimum quantity of material to be coated Within the coating section and also in maintaining a constant pressure drop across the bed throughout the coating process.
- losses are reduced so significantly that. air flows and hence coating rates can be increased two to three .times above that considered possible heretofore when using fine powders in the air suspension coating process.
- static electricity bleeds oit where velocity is high or changing, the operation of the cyclonic inducer alsofunctions to some extent as a discharge point for static electricity which tends to build up on small particles.
- the charge as noted above may be dissipated'by the cyclonic inducer which, if madeof metal, can also be grounded.
- the static charge can be controlled and kept down by humidifying the gas used to aerate and suspend the particles being coated. This can be done manual ly by controlled steam injection when needed, but can also be provided for automatically as described below.
- FIGURE 1 is a vertical sectional view of an apparatus in accordance with our invention and suitable for carrying out the process of our invention
- FIG URE 2 is a fragmentary isometric view of a portion of the apparatus shown in FIGURE 1;
- FIGURE 3 is a schematic wiring diagram of an electrical control circuit utilized in the apparatus shown in FEGURES l and 2.
- the illustrated apparatus which is similar to that shown in the above-noted copending application Serial No. 810,128, basically includes a tower 10, an auxiliary air supply system and an auxiliary coating material feed system.
- bell 12 including its lower and upper sections 18 and 2h encloses a chamber or settling section which is accessible at its upper and lower ends through openings of substantially smaller diameter than the main portion of bell 12 and which is further accessible by means of a lateral opening in the form of a charge port 116 which can be closed by a suitable cap 24 during operation.
- tower It is further provided with an elongated throat or coating section 2-5 which communicates at its upper end with the opening into lower bell section 1-8 and which at its lower end to tapered to still a further reduced diameter.
- throat section 26 Near itslower end throat 26 is provided with a downwardly inclined lateral discharge port 28 which is provided with a removable cap 3d.
- the lower end of throat section 26 terminates in a short cylindrical nozzle section 32. into which the air supply system and coating material feed system are connected.
- a line mesh grid 33 is mounted in the upper endof nozzle section 32 extending completely across'the interior of such section.
- tower 1.0 is further provided with a short vertical cylindrical disengaging section 34 which can be interiorlyprovided with-transversely positioned screens or .the' like to facilitate disengagement of entrained fines.
- disengaging section--34 tower It is further provided with a frustoconical exhaust connection 36' reducing the diameter of tower it! at its outlet end suitably for connection to a stack or fine or solvent recovery system.
- The'air supply system is conventional in nature and includes suitable provision for controlling humidity of and for heating air which is blown into the lower end of nozzle section 3-2 at the lower end of tower 10 through anair conduit 62 which is connected directly to nozzle section 32.
- Thecoating feed material system which is more com pletely described in the above-noted copending application basically is arranged to introduce the coating materials under suitable pressure through an inlet connection Patented Jan.- 7, 1964 106 of an atomizing nozzle 1&8 extending into the lower end of nozzle section 32 of tower lit).
- the coating material feed system further includes a second air inlet connection 120 leading into nozzle 108 for admitting compressed air to assist in atomizing the coating materials. It will be noted that compressed air inlet 120 and coating material inlet 106 enter nozzle section 32 and are directed at acute angles toward each other at their outlet ends to form atomizing nozzle N8.
- device 40 for imparting a cyclonic movement to upwardly rising gas in tower It as it passes from throat section 26 into bell section 12.
- device 40 consists of a central hub 42 from which a number of vanes 44 radiate; in the illustrated apparatus six such vanes are shown.
- Each vane 44 is a fiat blade of uniform cross sectional area and at its inner end is attached to hub 42 at a substantial angle to the axis of hub 42.
- Each such vane 44 moreover, is aflixed to hub 42 at the same angle as each other such that the cyclone inducer device 49 resembles a propeller.
- Cyclone inducer device 46 is positioned in tower 110 at the upper end of the coating or throat section 26 with the outer ends of vanes 44 securely afiixed to the inner wall of throat section 26 and with the axis of hub 42 coinciding on the vertical axis of tower 10 (see FIGURE 1).
- ionization gap '54 is electrically connected in series with the energizing coil 53a of a relay 58 across the terminals of a power supply 59. Physically the electrical connections to gap 54 are conveniently made by attaching such electrical connections to posts 57a and 57b which support plates 56a and 56b constituting ionization gap 54. Gap 54 is also provided with a shunt connection including a normally open push button switch oil which is physically located at a convenient place for the operator of the apparatus. Relay 58 is provided with a pair of normally open switches 58b and 530 which are connected in the power circuit for solenoid 52.
- actuation of push button 66 can be employed manually to drop relay 58 closing switches 58b and 580, thereby opening valve 50 to introduce steam into the air stream in inlet connection 62. It will be apparent that the presence of ionized gas between plates 56a and 56b will automatically produce the same actuation of valve 50.
- the particles in bed portion 13 and the particles in bed portion B will be constantly interchanging such that, statistically speaking, if for example half of the particles are in bed portion B and half of the particles are in bed portion B each particle while it is in tower 10 will have half of its residence time in bed portion 8; and the other half of its residence time in bed portion B
- the coating materials are then introduced into nozzle section 32 by pressuring the coating materials to force them through nozzle 108 from inlet connection res. At the same time a small stream of compressed air is introduced through nozzle 1% and inlet connection 12%.
- the stream of compressed air by impinging on the stream of coating materials issuing from nozzle 1% atomizes these materials such that they are carried suspended in the air stream rising upwardly through nozzle section 32 and into contact with the particles in bed portion B where the coating materials are deposited on the particles in bed portion B and dried by the rising warm air. This process is continued until the desired coating or particle size has been achieved.
- An apparatus for coating small particles in a fluidized bed comprising a vertical elongated hollow tower having a lower coating section and an upper settling section having a cross-sectional area substantially greater than the cross-sectional area of the coating section, a gas supply line connected to the lower end of the coating section, means to supply gas to said line, means positioned below the fluidized bed for atomizing coating material into the lower end of the coating section to coat said particles, said gas line, coating section and settling section forming a passage for upwardly flowing gas adapted to suspend the particles in said sections, and means in said tower positioned between the said coating and settling sections including a hub, the axis of which coincides with the vertical ads of the tower, and a plurality of blades fixed to said hub and to the inner walls of said tower at an angle with the vertical and radially extending from said hub to the Walls of said tower for imparting a swirling cyclonic movement to said upwardly flowing gas as it enters said settling section.
Description
Jan. 7, 1964 J. A. LINDLOF EIAL APPARATUS FOR COATING PARTICLES IN A FLUIDIZED BED Filed Jan. 8, 1960 INVENTORQ JAMES A. L/NDL 0F 0, a E. WURSTER BYW WC 1 ATTORNEYS United States Patent 3,117,027 APPARATUS FOR COATING PARTICLES IN A FLUIDIZED BED James A. Lindlof and Dale E. Wurster, Madison, Wis., assignors to Wisconsin Alumni Research Foundation, Madison, Wis', a corporation of Wisconsin Filed Jan; 8, 1960, Ser. No. 1,298 1 Claim. (Cl. 118-303) The present invention relates to the coating art and more specifically to'improvementsin the air suspension coating process. This process and illustrative apparatus for carrying out the process are described in Wurster Patent 2,648,609 and also in the copending Wurster application'Serial No. 810,128, filed April 30, 1959. As shown in these disclosures, the particles to be coated, e.g. tablets, crystals,-powders and the like, are suspended in a coating tower in a moving gas stream, e.g. an air stream, and the-coating composition in atomized or like form is introduced into the gas stream pnior to its contact with the suspended particles to be coated.
In practice it has been found when coating relatively small particles, e.g. small crystals or powders, in the air suspension coating process that a considerable amount of materia-l'being coated does-not settle out in the enlarged bell or settling section of the tower but tends to pass on out of the system through the exhaust connection or stack at the top of the tower. While this material can be recovered by conventional means such as by the use of a standard cyclone separator or the like, this procedure is objectionable as it interrupts the coating operation making controlled or uniform coating ditlicult. it also poses special problems involving the return of the recovered material to the coating section of the tower. Also, while the losses from the system can be kept to theminimum by reducing the air flow to the minimum required to suspend the particles and dry the coating, this is objectionable as it necessarily. results in a substantial decrease in the coating rate.
We have discovered that these problems can be readily solved by the placing of a cyclonic inducer, described below; between the coating and settling sections of the tower. The cyclonic inducer directs the particles leaving the coating section in such a manner that their momentum is reduced by being thrown against the outside of the settling section. In doing so they also impinge against returning particles causing a further substantial reduction of the upward or escape momentum.
The location of the cyclonic inducer is such that it acts to support par-t of the material in the settling section and automatically feeds it back into the coating section at a uniform rate. This aids inmaintaining .an optimum quantity of material to be coated Within the coating section and also in maintaining a constant pressure drop across the bed throughout the coating process. With the location of the cyclone inducer as noted above and described in detail below, losses are reduced so significantly that. air flows and hence coating rates can be increased two to three .times above that considered possible heretofore when using fine powders in the air suspension coating process. As static electricity bleeds oit where velocity is high or changing, the operation of the cyclonic inducer alsofunctions to some extent as a discharge point for static electricity which tends to build up on small particles.
The electrostatic charge, referred to above, may seriously interfere with the coating process when relatively small particles such *as small. vitamin A crystals, powders and the like are being coated. The charged particles, for example, may cling to the sides of the tower, build up and close the column completely and, if the pressure is allowed to build up, result in most of the particles finally being blown out of the exhaust stack.
The charge as noted above may be dissipated'by the cyclonic inducer which, if madeof metal, can also be grounded. We have also found that the static charge can be controlled and kept down by humidifying the gas used to aerate and suspend the particles being coated. This can be done manual ly by controlled steam injection when needed, but can also be provided for automatically as described below.
For a more complete understanding of the practical application of the principles of our invention reference is made to the appended drawings and following examples. In the drawings:
FIGURE 1 is a vertical sectional view of an apparatus in accordance with our invention and suitable for carrying out the process of our invention;
FIG URE 2 is a fragmentary isometric view of a portion of the apparatus shown in FIGURE 1; and
FIGURE 3 is a schematic wiring diagram of an electrical control circuit utilized in the apparatus shown in FEGURES l and 2.
Referring more particularly to FIGURE 1, the illustrated apparatus which is similar to that shown in the above-noted copending application Serial No. 810,128, basically includes a tower 10, an auxiliary air supply system and an auxiliary coating material feed system.
Depending from lower section 18 of bell l2, tower It) is further provided with an elongated throat or coating section 2-5 which communicates at its upper end with the opening into lower bell section 1-8 and which at its lower end to tapered to still a further reduced diameter. Near itslower end throat 26 is provided with a downwardly inclined lateral discharge port 28 which is provided with a removable cap 3d. The lower end of throat section 26 terminates in a short cylindrical nozzle section 32. into which the air supply system and coating material feed system are connected. A line mesh grid 33 is mounted in the upper endof nozzle section 32 extending completely across'the interior of such section.
Above upper bell section 20 tower 1.0 is further provided with a short vertical cylindrical disengaging section 34 which can be interiorlyprovided with-transversely positioned screens or .the' like to facilitate disengagement of entrained fines. Above disengaging section--34 tower It is further provided with a frustoconical exhaust connection 36' reducing the diameter of tower it! at its outlet end suitably for connection to a stack or fine or solvent recovery system.
The'air supply system "is conventional in nature and includes suitable provision for controlling humidity of and for heating air which is blown into the lower end of nozzle section 3-2 at the lower end of tower 10 through anair conduit 62 which is connected directly to nozzle section 32.
Thecoating feed material system which is more com pletely described in the above-noted copending application basically is arranged to introduce the coating materials under suitable pressure through an inlet connection Patented Jan.- 7, 1964 106 of an atomizing nozzle 1&8 extending into the lower end of nozzle section 32 of tower lit). The coating material feed system further includes a second air inlet connection 120 leading into nozzle 108 for admitting compressed air to assist in atomizing the coating materials. It will be noted that compressed air inlet 120 and coating material inlet 106 enter nozzle section 32 and are directed at acute angles toward each other at their outlet ends to form atomizing nozzle N8.
In accordance with this invention the apparatus described in the aforenoted copending application is further provided with a device 40 for imparting a cyclonic movement to upwardly rising gas in tower It as it passes from throat section 26 into bell section 12. Specifically referring more particularly to FIGURE 2, device 40 consists of a central hub 42 from which a number of vanes 44 radiate; in the illustrated apparatus six such vanes are shown. Each vane 44 is a fiat blade of uniform cross sectional area and at its inner end is attached to hub 42 at a substantial angle to the axis of hub 42. Each such vane 44, moreover, is aflixed to hub 42 at the same angle as each other such that the cyclone inducer device 49 resembles a propeller. Cyclone inducer device 46 is positioned in tower 110 at the upper end of the coating or throat section 26 with the outer ends of vanes 44 securely afiixed to the inner wall of throat section 26 and with the axis of hub 42 coinciding on the vertical axis of tower 10 (see FIGURE 1).
Tower 19 is further provided with devices to eliminate adherence of the materials being coated to the walls of tower 16 by reason of static electricity build up on the particles. These devices include a ground connection 46 for cyclone inducer device 46, which is ot metal construction, and an inlet pipe 48 connected into air inlet 62 for introducing steam into the warm air entering throat section 26. Steam inlet 43 is provided with a solenoid operated valve t) having a solenoid operator 52 capable of opening valve 50 when energized. At the upper end of tower specifically in exhaust connection as, tower ill is provided with an ionization gap 54 which consists of a pair of vertical plates 56a and 5612 which are spaced a short distance apart. Plates 56a and 56b are supported in exhaust connection 36, respectively, by metal posts 57a and 5712 which extend through opposite sides of exhaust connection 36 and are afiixed in the walls of exhaust connection 36.
Referring more specifically to FIGURE 3, ionization gap '54 is electrically connected in series with the energizing coil 53a of a relay 58 across the terminals of a power supply 59. Physically the electrical connections to gap 54 are conveniently made by attaching such electrical connections to posts 57a and 57b which support plates 56a and 56b constituting ionization gap 54. Gap 54 is also provided with a shunt connection including a normally open push button switch oil which is physically located at a convenient place for the operator of the apparatus. Relay 58 is provided with a pair of normally open switches 58b and 530 which are connected in the power circuit for solenoid 52. Thus actuation of push button 66 can be employed manually to drop relay 58 closing switches 58b and 580, thereby opening valve 50 to introduce steam into the air stream in inlet connection 62. It will be apparent that the presence of ionized gas between plates 56a and 56b will automatically produce the same actuation of valve 50.
In operation the charge of finely divided seed or powder on which the coating growth is to occur is introduced into tower 10 through lateral inlet port 16. Cap 24 is then placed in position to close port 16 and warm air is blown into tower 10 through inlet connection 62. As the warm air rises upwardly in tower 10 it carries the seed particles upwardly with it in a suspended state, generally forming an expanded fluidized bed B which is located partly in the upper end of throat 26 and partly in the lower end of bell 12.
For convenience bed B has been designated B where it exists in throat section 26 and B where it exists in bell section 12. It must be appreciated, however, that only a single bed is present.
As the air introduced through fitting 62 flows upwardly from throat section 26 into hell section 12 it passes cyclone inducer device issuing through the apertures between vanes 44. By reason of the angle of vanes 44 each stream of air passing between each adjacent pair of vanes 44 is given an angular movement which, relative to the vertical axis of tower 19, is the same for each other stream of air passing through each other adjacent pair of vanes 44. Consequently the air entering bell 12 has a swirling cyclonic flow which continues upwardly through hell 12 and into exhaust connection 36. As a result the particles in bed portion B located in bell 12 are thrown by the cyclonic flow or supporting air toward the walls of hell 12, substantially preventing them from being carried entrained in the air stream through exhaust connection as in much the same manner as though they had passed through a cyclone separator, with the difference, however, that the particles remain in a fluidized state.
It will be also appreciated that when the fluidized bed B has been established the particles in bed portion 13 and the particles in bed portion B will be constantly interchanging such that, statistically speaking, if for example half of the particles are in bed portion B and half of the particles are in bed portion B each particle while it is in tower 10 will have half of its residence time in bed portion 8; and the other half of its residence time in bed portion B When the desired balance between bed portion B and bed portion B has been determined by establishing the preferred amount of particles in bed portion B for optimum coating conditions, the coating materials are then introduced into nozzle section 32 by pressuring the coating materials to force them through nozzle 108 from inlet connection res. At the same time a small stream of compressed air is introduced through nozzle 1% and inlet connection 12%. The stream of compressed air by impinging on the stream of coating materials issuing from nozzle 1% atomizes these materials such that they are carried suspended in the air stream rising upwardly through nozzle section 32 and into contact with the particles in bed portion B where the coating materials are deposited on the particles in bed portion B and dried by the rising warm air. This process is continued until the desired coating or particle size has been achieved.
As pointed out above, with fine particle sizes a serious problem of the static electricity build-up on the particles frequently occurs, particularly where no humidity can be tolerated. By providing a ground connection 46 for cyclone inducer device 40 a certain amount of this static charge build-up is removed from the particles. Nevertheless and despite the static removal effect of the cyclonic movement of particles in bed portion B a static charge can still develop. In order to obviate this it has been found that injection of steam into the air Stream will effectively remove the static charge build-up. Accord ingly, :when the operator of the apparatus notices the effects of the static charge build-up, which is typically obvious by a noticeable collection of particles on the walls of the apparatus, the operator can by actuating push button open valve '50 to admit the necessary steam injection. The steam injection is continued until the static build-up is completely removed, and then it is terminated. In some instances, however, the operator is otherwise occupied and automatic steam injection is desirable. This is simply accomplished by the ionization gap 54 provided in exhaust connection 36. As a static charge condition occurs in tower 10 the build-up of charge on the particles in bed B is concomitant with ionization of the sup porting air or other gas. Consequently a convenient ionization detector circuit such as gap 54% is provided. As the air ionizes in tower 10 and reaches exhaust connection 36 the ionized air permits current to flow through gap 5 1 energizing relay 53a. Consequently valve 5% is opened and steam injection occurs. The steam injection continues until ionization of the air ceases when the static charge has been destroyed. Thereby the termination of current flow through gap 54 by reverse procedure cuts ofl the steam injection. The presence of moisture (water) destroys or removes the static charge and while the inven tion has been illustrated above by the introduction of the moisture into the air stream in the form of steam, it will be understood and obvious to those skilled in the art that the moisture can be introduced into the air stream by equivalent means such as in water spray form as well as in gas or vapor form. This and like modifications falling within the scope of the invention are intended to be covered by the claim appended hereto.
-It is claimed:
An apparatus for coating small particles in a fluidized bed comprising a vertical elongated hollow tower having a lower coating section and an upper settling section having a cross-sectional area substantially greater than the cross-sectional area of the coating section, a gas supply line connected to the lower end of the coating section, means to supply gas to said line, means positioned below the fluidized bed for atomizing coating material into the lower end of the coating section to coat said particles, said gas line, coating section and settling section forming a passage for upwardly flowing gas adapted to suspend the particles in said sections, and means in said tower positioned between the said coating and settling sections including a hub, the axis of which coincides with the vertical ads of the tower, and a plurality of blades fixed to said hub and to the inner walls of said tower at an angle with the vertical and radially extending from said hub to the Walls of said tower for imparting a swirling cyclonic movement to said upwardly flowing gas as it enters said settling section.
References Cited in the file of this patent UNITED STATES PATENTS 341,788 Arnold May 11, 1886 2,292,897 Nielsen Aug. 11, 1942 2,561,392 Marshall July 24, 1951 2,579,944 Marshall Dec. 25, 1951 2,729,598 Garbo Jan. 2, 1956 2,799,241 'Wurster July =16, 1957 2,986,475 Mesnard et al May 30 1961
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US3231413A (en) * | 1960-09-28 | 1966-01-25 | Potasse & Engrais Chimiques | Method and apparatus for granulating melted solid and hardenable fluid products |
US3354863A (en) * | 1963-10-28 | 1967-11-28 | Dow Chemical Co | Apparatus for coating particulate materials |
US3364053A (en) * | 1963-10-12 | 1968-01-16 | Polymer Corp | Method of coating articles |
US3385724A (en) * | 1960-03-02 | 1968-05-28 | Grun Gustav | Process and device for continuously treating powdered materials with stabilizing subsances |
US3507686A (en) * | 1967-06-23 | 1970-04-21 | Xerox Corp | Method of coating carrier beads |
US3632257A (en) * | 1969-09-04 | 1972-01-04 | Naoyoshi Ashizawa | Apparatus for making granules |
US4100148A (en) * | 1975-06-13 | 1978-07-11 | Rutgerswerke Aktiengesellschaft | Storage-stable, very quickly hardenable, one-component sealant based on mercapto-terminated polymers |
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