EP0230832A1 - 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
EP0230832A1
EP0230832A1 EP86402898A EP86402898A EP0230832A1 EP 0230832 A1 EP0230832 A1 EP 0230832A1 EP 86402898 A EP86402898 A EP 86402898A EP 86402898 A EP86402898 A EP 86402898A EP 0230832 A1 EP0230832 A1 EP 0230832A1
Authority
EP
European Patent Office
Prior art keywords
bowl
cover
base
vacuum
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.)
Granted
Application number
EP86402898A
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English (en)
French (fr)
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EP0230832B1 (de
Inventor
Jacques Guiet
Philippe Martin
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
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 technology proceeds, in a first chamber, to vacuum spatulation then, to improve the elimination of gas inclusions and the homogenization, transfers the mixture to a second chamber in which the dough is subjected simultaneously to mechanical vibrations and to 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 vibra field tion 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 15000 Hz, preferably between 2000 and 8000 Hz and their amplitude between 0.1 and 5 mm.
  • the vibration of the kneaded mass during the spatulation takes off the surface layers from the walls and pushes them back into the zone subjected to the flow and 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 of revolution carried by this base, a cover which closes this bowl in a leaktight manner, a vacuum pipe 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 drive of the assembly 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 in through 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 connector block being integral with the vibrating base 13.
  • the vibrating base 13 has at its bottom three cylindrical bowls spaced 120 ° apart, one of these bowls 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.
  • the assembly 21-28 is applied to the vibrating base 13.
  • the direction of the vibrations is selected by switching the supply of the vibration generator on the generator 11a giving vertical vibrations or 11b giving horizontal vibrations, said vibrations having a frequency of 5 to 6000 Hz and an amplitude between 1.25 and 2.50 mm.
  • the motor 5 is started, this driving the vacuum pump 6 which puts under vacuum through the channel 10 and the channel 24 of the stud 22 engaged in the bowl 19, the volume of the bowl.
  • the vacuum is also transmitted through the channel 24 of the other two studs in the bowls 20, which provides reinforced support for the assembly formed by the cover 21 and the bowl 28 under the vibrating base 13.
  • the mixture and mixing takes place under vacuum under the combined action of mechanical stirring and vibrations.
  • 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 depression in the bowl was 110 KPa, the rotation speed of the blades 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)
  • Medicinal Preparation (AREA)
  • Noodles (AREA)
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 true EP0230832A1 (de) 1987-08-05
EP0230832B1 EP0230832B1 (de) 1990-11-28

Family

ID=9326064

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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB903592A (en) * 1958-07-10 1962-08-15 Baker Perkins Ltd Improvements relating to mixing machines
US3131912A (en) * 1954-02-01 1964-05-05 Edmund A Steinbock Investment 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
US3640510A (en) * 1969-09-26 1972-02-08 Degussa Vacuum stirring device for dental materials
DE2425158A1 (de) * 1974-05-24 1975-12-04 Gvnii Str Materialow I Konstru Mischer
FR2307572A1 (fr) * 1975-04-18 1976-11-12 Ceraver Perfectionnement aux petrins ou malaxeurs a cuve a fond spherique

Family Cites Families (11)

* 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
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
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
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131912A (en) * 1954-02-01 1964-05-05 Edmund A Steinbock Investment mixer
GB903592A (en) * 1958-07-10 1962-08-15 Baker Perkins Ltd Improvements relating to mixing machines
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
US3640510A (en) * 1969-09-26 1972-02-08 Degussa Vacuum stirring device for dental materials
DE2425158A1 (de) * 1974-05-24 1975-12-04 Gvnii Str Materialow I Konstru Mischer
FR2307572A1 (fr) * 1975-04-18 1976-11-12 Ceraver Perfectionnement aux petrins ou malaxeurs a cuve a fond spherique

Also Published As

Publication number Publication date
DE3675916D1 (de) 1991-01-10
ATE58651T1 (de) 1990-12-15
FR2591912A1 (fr) 1987-06-26
FR2591912B1 (fr) 1988-03-18
ES2019879B3 (es) 1991-07-16
EP0230832B1 (de) 1990-11-28
US5121990A (en) 1992-06-16

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