EP0230832B1 - Verfahren für die Herstellung einer Paste auf der Basis von Alginat, Gips oder ähnlichen Substanzen und Vorrichtung dafür - Google Patents

Verfahren für die Herstellung einer Paste auf der Basis von Alginat, Gips oder ähnlichen Substanzen und Vorrichtung dafür Download PDF

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Publication number
EP0230832B1
EP0230832B1 EP86402898A EP86402898A EP0230832B1 EP 0230832 B1 EP0230832 B1 EP 0230832B1 EP 86402898 A EP86402898 A EP 86402898A EP 86402898 A EP86402898 A EP 86402898A EP 0230832 B1 EP0230832 B1 EP 0230832B1
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EP
European Patent Office
Prior art keywords
bowl
cover
base
vibrations
mixture
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
EP86402898A
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English (en)
French (fr)
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EP0230832A1 (de
Inventor
Jacques Guiet
Philippe Martin
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Individual
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Priority to AT86402898T priority Critical patent/ATE58651T1/de
Publication of EP0230832A1 publication Critical patent/EP0230832A1/de
Application granted granted Critical
Publication of EP0230832B1 publication Critical patent/EP0230832B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/56—Mixers with shaking, oscillating, or vibrating mechanisms having a vibrating receptacle provided with stirring elements, e.g. independent stirring elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/20—Mixing of ingredients for bone cement
    • 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
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/501—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use
    • B01F33/5011—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held
    • 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
    • Y10S366/00—Agitating
    • Y10S366/602—Amalgam mixer, e.g. dental filling

Definitions

  • the present invention relates to the preparation of a molding paste based on alginates, plaster or similar substances, this preparation being carried out by mixing a powder of alginates, plaster or similar substances with water and the pastes obtained being used in dentistry and in particular, as regards alginates, for molding dental impressions and, as regards other substances mainly mixtures of plaster with silica, silicates or phosphates for molding of compensating coatings.
  • These pastes must be absolutely homogeneous and have no gas bubbles included.
  • FR-A-1,473,563 which relates to the same field of the technique proceeds, in a first chamber, to a vacuum spatulation then, to improve the elimination of gas inclusions and the homogenization, transfers the mixture into a second chamber in which the dough is subjected simultaneously to mechanical vibrations and vacuum. It is indeed known, in particular in the concrete technique, that the vibration improves the homogeneity of the doughs.
  • This known method for preparing a vacuum dough which performs the mixing in a first enclosure and the vibration in a second enclosure has many practical drawbacks such as in particular the need to transfer from one enclosure to another during of the preparation process. It also has other drawbacks with regard to the homogeneity of the mixture and the presence in the final mixture of very fine gas bubbles.
  • the first of these drawbacks is due to the fact that the mixer or spatulator has dead zones, in particular the surface layer which adheres to the wall of the bowl and to the blades of the spatulator, zones in which there is no mechanical mixing of the dough.
  • the second of these drawbacks results from the low amplitude of the mechanical vibrations which is insufficient to ensure a circulation of the fine gas bubbles causing a coalescence increasing their volume until giving them a sufficient upward force in particular in a viscous paste.
  • the present invention results from the discovery that it is possible to avoid all of these drawbacks.
  • the process according to the invention for preparing a paste by mixing at least one constituent substance in the form of a powder with at least one constituent substance in liquid form, mechanical mixing of the mixture under vacuum and setting in vibration vacuum mixing is characterized in that the mixture is subjected to a vibration field during at least the final phase of mechanical mixing.
  • the mixture is, first of all vibrated then after placing under vacuum, mechanically kneaded.
  • This setting in vibration before kneading promotes the imbibition of the powder by the liquid before spatulation.
  • the frequency of the vibrations can be between 50 and 15,000 Hz, preferably between 2,000 and 8,000 Hz and their amplitude between 0.1 and 5 mm.
  • the vibration of the kneaded mass during the spatula peels off the surface layers of the walls and pushes them back into the zone subjected to the flow and the rolling of the dough fillets due to mechanical stirring.
  • the fine gas bubbles are subjected by the effect of vibrations to rapid cycles of compression-depression which facilitate their circulation in the dough but they are at the same time put into circulation by mechanical stirring, which promotes coalescence in the form of larger bubbles with higher upward force and speed.
  • the vertical or horizontal direction of the vibrations that is to say parallel or perpendicular to the axis of rotation of the mixer, is chosen according to the density and the viscosity of the dough.
  • the constituent substances in particular the water which constitutes the liquid, are used at a low temperature close to the freezing point of the liquid.
  • the system is cooled during mechanical mixing.
  • the present invention also relates to a device for implementing the method, this device comprising a base, a bowl having a shape of revolution carried by this base, a cover which closes this bowl tightly, a delivery line vacuum opening under the underside of the cover and connected at its other end to a vacuum source and mixing blades carried by an axis passing through the cover, the axis being connected by a connecting member with a rotary drive motor and the device being characterized in that the bowl is suspended under the lid and secured in a removable manner with the latter with means for imparting vibrations to the assembly of the lid and of the bowl via the lid.
  • the wall of the bowl includes a circuit for the circulation of a refrigerant.
  • the device comprises a frame designated by the overall reference 1 with a base 2, a foot forming column 3 and an upper console 4.
  • the electric motor 5 of en training seems and the vacuum pump 6 driven from the engine by a transmission belt 7, the engine and the pump being mounted on a plate 8.
  • the vacuum pump 6 discharges into a filtering and damping chamber 9 and sucks by a pipe 10.
  • a vertical vibration generator 11a and a horizontal vibration generator 11b are also mounted on the frame.
  • the vibrating base 13 which is constituted by a box connected by a rod 14 to the vibrating member of the generator 11.
  • the motor shaft 5 drives by a reduction gear 15 a vertical shaft 16 which is secured by a deformable elastic coupling 17 with an axis connection block of any known type 18, this connection block being integral with the vibrating base 13.
  • the vibrating base 13 has at its bottom three cylindrical cups spaced 120 ° apart, one of these cups 19 being connected to the pipe 10 of the vacuum pump and the other two 20 being blind.
  • the cover 21 of the spatula bowl carries three studs 22 intended to engage in a sealed manner by means of a peripheral seal 23 in the three bowls, these studs having a central channel 24 which opens into the underside of the cover 21.
  • the cover 21 comprises a sleeve 25 in which is rotatably mounted a pin 26 carrying at its lower part perforated blades 27.
  • the bowl 28 fits tightly by a seal 29 under the cover 21.
  • a mixture consisting of 25 g of alginates and 20 g of water was placed in the bowl at a temperature of 9 ° C.
  • the vacuum in the bowl was 110 KPa, the blade rotation speed was 250 rpm and the vibrations had a frequency of 5.500 Hz with an amplitude of 1.75 mm.
  • the alginate mixture was perfectly homogeneous and without any perceptible gas bubble.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Dental Preparations (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Noodles (AREA)
  • Medicinal Preparation (AREA)

Claims (9)

1. Verfahren für die Herstellung einer Paste durch Vermischung wenigstens einer, insbesondere pulverförmigen, Substanz mit wenigstens einer flüssigen Substanz, mechanisches Vakuummischen des Gemischs und Vakuumvibration des Gemischs, dadurch gekennzeichnet, daß man das Gemisch wenigstens während der Endphase der mechanischen Mischung einem Vibrationsfeld aussetzt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Mischung zunächst in Vibration versetzt und anschließend, nachdem ein Vakuum hergestellt wurde, mechanisch gemischt wird.
3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Vibrationsfrequenz zwischen 50 und 15 000 Hz, vorzugsweise zwischen 2000 und 8000 Hz, liegt und die Amplitude zwischen 0,1 und 5 mm beträgt.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß, je nach Dichte und Viskosität der Paste, die Vibrationsrichtung vertikal oder horizontal gewählt wird.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die das Gemisch bildenden Substanzen bei niedriger Temperatur, vorzugsweise einer Temperatur in Nähe des Gefrierpunkts der Flüssigkeit, angewandt werden.
6. Vorrichtung für die Anwendung des Verfahrens nach einem der Ansprüche 1 bis 5, bestehend aus einem Fuß, einem Behälter in drehbarer Form, der auf diesem Fuß aufliegt, einem Deckel zum dichten Verschließen dieses Behälters, einer Vakuumleitung, die unter der Innenfläche des Deckels einmündet und mit dem anderen Ende an eine Vakuumquelle angeschlossen ist, sowie Mischflügeln, die auf einer durch den Deckel hindurch verlaufenden Achse aufliegen, wobei die Achse über ein Verbindungsorgan mit dem Antriebsmotor drehbar verbunden ist, dadurch gekennzeichnet, daß der Behälter (28) unter dem Deckel (21) aufgehängt und auf unbewegliche Weise mit diesem durch Mittel (11) verbunden ist, um über den Deckel Vibrationen auf die aus Deckel (21) und Behälter (28) bestehende Einheit zu übertragen.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß ein Vibrationsfuß (13) unter einer Konsole (4) des Rahmens (1) mittels elastischen Blöcken (12) aufgehängt ist, wobei dieser Vibrationsfuß den Deckel (21) trägt, worin drehbar die Achse (26) der Flügel (27) des Mischers angebracht ist, welche mit dem Antriebsmotor (5) über eine bewegliche Kupplung (18) und einen Vibrationsdämpfer (17) verbunden ist, während der Behälter (28) durch den Unterdruck unter dem Deckel (21) festgehalten und der Vibrationsfuß (13) durch die auf dem Fuß (1) aufliegenden Mitteln (11a, 11b) in Vibration versetzt wird.
8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der Deckel (21) unter dem Vibrationsfuß (13) durch drei Zapfen (22) zentriert ist, die in Schalen (19-20) im Fuß eingreifen, wobei das Vakuum aus dem Behälter (28) in diese Schalen (19-20) übertragen wird, um die aus Deckel (21) und Behälter (28) bestehende Einheit in ihrer Lage auf dem Vibrationsfu (13) festzuhalten.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Erzeugung des Vakuums im Behälter (28) durch eine Leitung (10) bewirkt wird, die am Boden einer Schale (19) des Vibrationsfußes (13) einmünden, während die Zapfen (22) axial durchbohrt (24) sind, um eine Verbindung zwischen der Schale (19) und dem Behälter (28) sowie zwischen letzterem und den beiden anderen Schalen (20) herzustellen.
EP86402898A 1985-12-23 1986-12-22 Verfahren für die Herstellung einer Paste auf der Basis von Alginat, Gips oder ähnlichen Substanzen und Vorrichtung dafür Expired - Lifetime EP0230832B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402898T ATE58651T1 (de) 1985-12-23 1986-12-22 Verfahren fuer die herstellung einer paste auf der basis von alginat, gips oder aehnlichen substanzen und vorrichtung dafuer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8519025 1985-12-23
FR8519025A FR2591912B1 (fr) 1985-12-23 1985-12-23 Procede de preparation d'une pate a base d'alginate ou de platre et dispositif pour sa mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0230832A1 EP0230832A1 (de) 1987-08-05
EP0230832B1 true EP0230832B1 (de) 1990-11-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402898A Expired - Lifetime EP0230832B1 (de) 1985-12-23 1986-12-22 Verfahren für die Herstellung einer Paste auf der Basis von Alginat, Gips oder ähnlichen Substanzen und Vorrichtung dafür

Country Status (6)

Country Link
US (1) US5121990A (de)
EP (1) EP0230832B1 (de)
AT (1) ATE58651T1 (de)
DE (1) DE3675916D1 (de)
ES (1) ES2019879B3 (de)
FR (1) FR2591912B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4973168A (en) * 1989-01-13 1990-11-27 Chan Kwan Ho Vacuum mixing/bone cement cartridge and kit
SE510490C2 (sv) * 1992-02-07 1999-05-31 Scandimed International Ab Förfarande för framställning av bencement och anordning för genomförande av förfarandet
US5664699A (en) * 1995-04-04 1997-09-09 Simpson Technologies Corporation Core sand preparation apparatus
FR2762526B1 (fr) * 1997-04-24 2000-01-28 Jean Luc Jouvin Malaxeur d'alginate ameliore
US6120174A (en) * 1999-01-14 2000-09-19 Bristol-Myers Squibb Apparatus and method for mixing and dispensing bone cement
US8057090B1 (en) * 2005-08-31 2011-11-15 Subrata Saha Automated bone cement mixer

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772083A (en) * 1927-10-19 1930-08-05 George M Hollenback Dental device
US1863977A (en) * 1929-06-18 1932-06-21 Formell Corp Ltd Combination vibrator and mixer unit
US2301947A (en) * 1939-02-11 1942-11-17 Hannen Clemens Method and apparatus for separating out admixtures from molten metal baths
US2453914A (en) * 1944-04-10 1948-11-16 George M Hollenback Device for mixing plaster compounds and mixtures
US3131912A (en) * 1954-02-01 1964-05-05 Edmund A Steinbock Investment mixer
US3075746A (en) * 1958-07-10 1963-01-29 Baker Perkins Inc Mixer for explosive materials
US2973187A (en) * 1958-08-11 1961-02-28 Bruno F Wehmer Vacuum spatulator
US3139270A (en) * 1960-10-13 1964-06-30 Whip Mix Corp Power mixer
FR1473563A (fr) * 1966-03-28 1967-03-17 Appareil pour mélanger et transvaser sous vide pâtes et plâtres spéciaux utilisables pour obtenir des empreintes et des moulages dans le domaine des techniques odontologiques et en orfèvrerie
US3411755A (en) * 1967-04-25 1968-11-19 Dentek Inc Mixing apparatus for use in the preparation of dental cement and method of preparing the same
SE310754B (de) * 1967-08-28 1969-05-12 G Bergendal
US3620508A (en) * 1969-09-26 1971-11-16 Degussa Apparatus for filling dental mold flasks
US3640510A (en) * 1969-09-26 1972-02-08 Degussa Vacuum stirring device for dental materials
DE2425158C3 (de) * 1974-05-24 1978-10-19 Gosudarstvennyj Vsesojuznyj Nautschno- Issledovatelskij Institut Stroitelnych Materialov I Konstrukcij, Kraskowo (Sowjetunion) Baustoffmischer
FR2307572A1 (fr) * 1975-04-18 1976-11-12 Ceraver Perfectionnement aux petrins ou malaxeurs a cuve a fond spherique
US4071225A (en) * 1976-03-04 1978-01-31 Holl Research Corporation Apparatus and processes for the treatment of materials by ultrasonic longitudinal pressure oscillations
US4473673A (en) * 1983-05-09 1984-09-25 Wildon Industries, Inc. Cast polyester resin process and product

Also Published As

Publication number Publication date
ATE58651T1 (de) 1990-12-15
EP0230832A1 (de) 1987-08-05
FR2591912A1 (fr) 1987-06-26
ES2019879B3 (es) 1991-07-16
DE3675916D1 (de) 1991-01-10
US5121990A (en) 1992-06-16
FR2591912B1 (fr) 1988-03-18

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