EP0933142B1 - Procédé pour le tri pneumatique de toner - Google Patents

Procédé pour le tri pneumatique de toner Download PDF

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Publication number
EP0933142B1
EP0933142B1 EP99100551A EP99100551A EP0933142B1 EP 0933142 B1 EP0933142 B1 EP 0933142B1 EP 99100551 A EP99100551 A EP 99100551A EP 99100551 A EP99100551 A EP 99100551A EP 0933142 B1 EP0933142 B1 EP 0933142B1
Authority
EP
European Patent Office
Prior art keywords
classifying
toner
zone
classification
toner product
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.)
Expired - Lifetime
Application number
EP99100551A
Other languages
German (de)
English (en)
Other versions
EP0933142A3 (fr
EP0933142A2 (fr
Inventor
Marcus Dipl.-Ing Adam
Stefano Dipl.-Ing. Zampini
Bodo Dr.-Ing. Furchner
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.)
Hosokawa Alpine AG
Original Assignee
Hosokawa Alpine AG
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 Hosokawa Alpine AG filed Critical Hosokawa Alpine AG
Publication of EP0933142A2 publication Critical patent/EP0933142A2/fr
Publication of EP0933142A3 publication Critical patent/EP0933142A3/fr
Application granted granted Critical
Publication of EP0933142B1 publication Critical patent/EP0933142B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/0802—Preparation methods
    • G03G9/0817—Separation; Classifying

Definitions

  • the present invention relates to the manufacturing process of a toner certain grain distribution for the development of electrostatically generated images, in particular on a visual procedure to set the required Grain distribution as a means of achieving excellent quality of the toner product.
  • the manufacture of prior art toner involves blending suitable components, extruding, cooling and the subsequent Crushing.
  • the shredded material is then subjected to a screening remove unwanted particle fractions and create a product with the desired Obtain particle size distribution.
  • the particle size distribution (PGV) is usually on a Coulter Counter Multisizer from Coulter Electronics, Inc. (USA) measured and is a number distribution.
  • the aim of the sighting is usually a Separation of very fine particles in the range below 5 ⁇ m, but sometimes also one Upper grain limit or both together.
  • the object of the invention is to provide a process for producing Toner that solves the problems described above and enables a toner with a required, narrow particle size distribution as effectively as possible manufacture. Another task is to provide a process for it enables the fine fraction of the product to be reduced. Furthermore, it is about a process in which both the fine fraction and the top grain are reduced can be limited, whereby a narrow particle size distribution by sighting is achieved with a directed material guide, the starting material the screening by mixing, extruding and crushing a basic mixture was obtained.
  • the object of the invention is achieved in that a even distribution of the toner product over the circumference of the classifier wheel is achieved, the toner product in a directional material guide in the direction of Gravity is guided through the viewing zone and to control the dwell time of the toner product means are provided in the viewing zone, in the upper area the toner product in the homogeneous state quickly into the viewing zone bring the toner product in the middle of the field of view longer let it linger and one in the lower area of the visual zone enable rapid removal of the toner product from the viewing zone.
  • the feed material coming from the crushing process becomes one or subjected to several sightings, depending on whether only one dedusting or one combined dedusting / upper grain limitation is required.
  • sole Dedusting is obtained as a coarse fraction that represents the product and one Fine fraction that can be recycled.
  • With a combined Dedusting / upper grain limitation gives you a fine fraction, a coarse fraction and a middle fraction representing the product.
  • ⁇ ges ⁇ 1 xn a with 1 ⁇ a ⁇ 1.6
  • the value 1.3 is preferably chosen for a. This results in triple Sighting a possible loading from 0.2 to 0.83. Of course there is also one multiple sightings in the range of a ⁇ 1 possible. This will make the product quality optimized for maximum coarse material.
  • a vertical-axis air classifier is used, the one central feed with tangential, arranged at the level of the classifier rotor Visual air supply, a fixed one on the circumference of the classifying rotor in radial Spacer vane ring, an annular one through one mounted paddle wheel classifier rotor and a coaxial at a radial distance from The outer circumference of the classifying rotor arranged guide vane ring limited Visual space, a drive shaft for the classifier rotor mounted on one side and a Has housing with fine and coarse material outlet.
  • the material to be sifted is fed in centrally and spread over a spreading plate distributed and bell-shaped over the outer circumference of the classifying rotor evenly distributed good veil passed past the classifier wheel blades.
  • the classifying wheel is flowed through by the classifying air from the outside in and that Fine material directed into the interior of the classifier rotor.
  • the rejected coarse material follows gravity continues and is surrounded by an annular coarse material discharge area added.
  • the visible air flows radially from the outside to the inside.
  • the rotating paddle wheel rejects the coarse material radially outwards and the fine material together with the classifying air into the interior of the classifying rotor transported.
  • the fine material sighted is then led axially downward Redirected direction and then out of the classifier rotor through the broken through drive shaft.
  • the section of the drive shaft 2 penetrating the fine material discharge space is designed as a perforated shaft part, the support device 10, and thereby enables the fine material to pass from inside the classifier wheel 8 into the fine material discharge space 14.
  • This support device 10 comprises the base plate 18, the washer 17, and the aerodynamic spacer webs 10a and form a connecting link between the drive shaft 2 and classifier wheel 8 and the passages for the discharge of the fine material from the inside of classifier wheel 8.
  • the classifier wheel 8 consists of the classifier wheel vane ring 9, the lens 16 and the cover plate 15 and is rotatably connected to the support device 10 .
  • This connection in the area of the discs 15 and 17 can be designed releasably and z. B. by screws 19 arranged uniformly over the circumference of the classifying rotor.
  • a seal 20 that can be flushed with a fluid is shown in an axial arrangement and reliably separates the visible space 21 from the fine material outlet space 14.
  • the lower cover disk 15 projects beyond the inner diameter of the annular disk 17, and thus over the support device 10 into the interior , and thus forms an orifice with a throttling effect in the transition area.
  • the goods are placed on the cover plate 16 of the classifying wheel 8, which forms a diffusing plate.
  • the annular channel between the outer diameter of the classifying wheel 8 and the inner diameter of the guide vane ring 13 forms the classifying space 21 over the height of the classifying wheel 8 .
  • the visible material 21 flows through the visible space 21 in the vertical direction.
  • a screw spiral 29 extends almost over the entire radial width of the visible space 21 and extends over the entire height of the classifying wheel 8 .
  • a single helical screw with a constant pitch is used.
  • the sifting air flow runs perpendicular to the sifting material flow.
  • the classifying air from the classifying air inlet 22 passes horizontally through the fixed guide vane ring 3 into the classifying chamber 21 and flows through it perpendicularly to the classifying material flow.
  • the fine material sighted is discharged axially with the classifying air via the fine material outlet 23 .
  • the coarse material sighted is discharged through the coarse material discharge space 13 below the viewing space 21 via the coarse material outlet 24 .
  • the coarse material discharge ring 25 is fixedly connected to the classifying wheel 8 and rotates within the coarse material discharge space 13.
  • the fixed retaining ring 26 is arranged above the coarse material discharge space 13 and is fixedly connected to the housing 1 .
  • the gap 27 for the introduction of the scavenging air 28 is located between the bottom of the coarse material discharge space 13 and the coarse material discharge ring 25 .
  • the drive shaft is arranged above the classifying wheel and penetrates the product feed area.
  • the material is fed in centrally from above through the ring-shaped feed opening 220 onto the classifying wheel 221.
  • the material is thrown outwards against the impact ring 222 and is thus distributed evenly over the circumference. It then falls into the viewing gap between the blade ring 223 and the classifying wheel 221, where it is flushed by the classifying air.
  • the classifying air enters the classifying chamber through the spiral housing 224 , flows through the classifying wheel 221 and leaves the classifier together with the fine material downward in the direction of gravity through the fine material outlet 225.
  • the blade ring 223 is equipped with one or more screw spirals 226 in order to increase the dwell time to control the material. For various visual tasks, e.g. B. Coarse or fine sighting, different blade rings can also be used.
  • a screening process according to the invention for dedusting which includes the screen type described above, is shown in FIG. 3.
  • the task is carried out from above by a suitable metering element 301.
  • the ratio of sifting air volume flow to feed mass flow should be in the range from 0.05 kg / m 3 to 0.3 kg / m 3 , preferably 0.1 kg / m 3 .
  • the classifying air enters classifier 306 through classifying air inlet 304 and is drawn in by fan 309 through classifier 306 into an optional cyclone 307 and filter 308 .
  • the blower 309 is adjusted so that air velocities in the range of 3 m / s to 7 m / s are present on the outer edge of the classifying wheel.
  • the peripheral speeds of the classifying wheel for a fine sighting are between 40 m / s and 65 m / s, for a rough sighting they are preferably in the range of 20 m / s to 45 m / s.
  • the process mentioned here can either be operated with a downstream cyclone 307 and a filter 308 or only with a filter 308 .
  • the selected fine material is first fed to the cyclone 307 via the fine material line 318 and the essential part is separated from the classifying air and can be discharged via the fine material discharge 303 .
  • Ultrafine particles that were still entrained with the visible air settle on the filter 308 and can be removed via the dust discharge 305 after being blasted off from the filter material.
  • the finished product is obtained via the coarse material discharge 302 .
  • Fig. 4 shows such a system scheme for a combined rough and Fine sighting and double fine sighting.
  • the material is first subjected to a fine screening analogous to FIG. 3.
  • the product to be processed is the coarse material from the first screening and is fed to the product task of the second classifier 410 via the line of the first coarse material discharge 402 .
  • the feed material is subjected to a rough screening in order to limit the top grain, i.e. the fine material obtained in the second screening from the cyclone 411 and the filter 412 is obtained via the fine material discharge 416 and the dust discharge 417 and represents the actual product
  • the very coarse fractions, the grain diameter of which is above the desired upper grain limit, are discharged via the coarse material discharge 415 and can be discarded or, for example, re-ground.
  • the particle size distribution curves are measured in diagrams 1 and 2 with a Coulter Counter Multisizer from Coulter Electronics, Inc. (USA). The goal was to remove dust by separating the Fine particles below 5 ⁇ m.
  • the starting material has a very high proportion of fine material and thus represents a low quality toner.
  • Diagram 1 shows the product improvement as it is achieved by a two-stage fine sighting according to the invention according to FIG. 4 becomes. It can be clearly seen that the first sighting is far can remove most of the fine dust below 5 ⁇ m. Through the following the second fine screening, the proportion of fine dust is increased again by approx. 50% reduced. The finished sighted product shows a very high slope above the separation limit of 5 ⁇ m. By the method according to the invention thus achieved a very sharp separation.
  • the particle size distribution curves are one sighting according to the invention with a controlled dwell time of the material to be sighted Sighting without such control using the same Sifter types and the same sifter settings are compared.
  • the Control of the dwell time of the material to be viewed in the viewing zone can, otherwise same visibility conditions, much more fine dust from the sight be separated.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Claims (6)

  1. Procédé destiné à la sélection pneumatique de toners pour le développement d'images de production électrostatique, notamment à obtenir d'un produit du toner se composant d'un poudre d'une répartition granulométrique large un produit du toner, d'une qualité supérieure avec une répartition granulométrique étroite, caractérisé en ce que
    la répartition uniforme du produit du toner sur toute la circonférence de la roue de sélection se réalise par une sole distributrice,
    le produit du toner est conduit par un guidage dirigé dans le sens de la gravité à travers la zone de sélection,
    des dispositifs prévus au contrôle de la durée de séjour du produit dans la zone de sélection, qui assurent l'amenée rapide du produit du toner en état homogène à la partie supérieure de sélection, le séjour prolongé du produit du toner dans la zone moyenne de sélection et l'évacuation rapide du produit du toner de la zone de sélection inférieure,
    l'air de sélection passe le bord extérieur de la turbine à une vitesse moyenne de 3 à 7 m/s et le rapport entre le débit massique du produit du toner à sélectionner / débit volumétrique de l'air du sélecteur est maintenu entre 0,05 kg/m3 et 0,3 kg/m3.
  2. Procédé selon la revendication 1, caractérisé en ce que le dispositif destiné à contrôler la durée de séjour est une hélice d'étendue coaxiale autour de la turbine de sélection dans la zone de sélection.
  3. Procédé selon la revendication 2, caractérisé en ce que l'hélice n'est disposée que dans une zone partielle de l'étendue radiale de la zone de sélection.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que l'hélice dispose de pas différents sur sa longueur.
  5. Procédé selon l'une des revendications de 1 à 4, caractérisé en ce que le rapport préféré entre le débit massique du produit du toner / le rapport volumétrique de l'air de sélection est 0,1 kg/m3.
  6. Procédé selon l'une des revendications de 1 à 5, caractérisé en ce que la vitesse moyenne préférée de l'air de sélection est 5 m/s.
EP99100551A 1998-01-28 1999-01-13 Procédé pour le tri pneumatique de toner Expired - Lifetime EP0933142B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803107A DE19803107A1 (de) 1998-01-28 1998-01-28 Verfahren zur Windsichtung von Toner
DE19803107 1998-01-28

Publications (3)

Publication Number Publication Date
EP0933142A2 EP0933142A2 (fr) 1999-08-04
EP0933142A3 EP0933142A3 (fr) 2000-07-19
EP0933142B1 true EP0933142B1 (fr) 2002-06-05

Family

ID=7855831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99100551A Expired - Lifetime EP0933142B1 (fr) 1998-01-28 1999-01-13 Procédé pour le tri pneumatique de toner

Country Status (4)

Country Link
EP (1) EP0933142B1 (fr)
JP (1) JPH11288133A (fr)
AT (1) ATE218399T1 (fr)
DE (2) DE19803107A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10007794A1 (de) 2000-02-21 2001-06-28 Zimmer Ag Polymerzusammensetzung und daraus hergestellter Formkörper
US6776291B1 (en) † 2000-09-27 2004-08-17 Xerox Corporation Article and apparatus for particulate size separation
JP5078138B2 (ja) * 2007-08-23 2012-11-21 アシザワ・ファインテック株式会社 遠心分級機

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304360A (en) * 1979-12-31 1981-12-08 International Business Machines Corporation Xerograhic toner manufacture
US5016823A (en) * 1989-05-12 1991-05-21 Canon Kabushiki Kaisha Air current classifier, process for preparing toner, and apparatus for preparing toner
DE4014342C2 (de) * 1990-05-04 1994-06-23 Heinz Jaeger Windsichter
DK0836893T3 (da) * 1996-10-18 2003-03-24 Hosokawa Alpine Ag & Co Vertikalakset vindsigte

Also Published As

Publication number Publication date
DE19803107A1 (de) 1999-07-29
DE59901580D1 (de) 2002-07-11
EP0933142A3 (fr) 2000-07-19
JPH11288133A (ja) 1999-10-19
EP0933142A2 (fr) 1999-08-04
ATE218399T1 (de) 2002-06-15

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