US20080264809A1 - Method for the Production of Dental Moulding Materials and Device Therefor - Google Patents

Method for the Production of Dental Moulding Materials and Device Therefor Download PDF

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Publication number
US20080264809A1
US20080264809A1 US10/590,760 US59076005A US2008264809A1 US 20080264809 A1 US20080264809 A1 US 20080264809A1 US 59076005 A US59076005 A US 59076005A US 2008264809 A1 US2008264809 A1 US 2008264809A1
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United States
Prior art keywords
mixer
mixing
chamber
chamber section
closing part
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.)
Abandoned
Application number
US10/590,760
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English (en)
Inventor
Gottfried Knispel
Klaus-Dieter Nehren
Holger Urbas
Matthias Schaub
Alfred Von Schuckmann
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.)
Kulzer GmbH
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Heraeus Kulzer GmbH
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
Priority claimed from DE102004010156A external-priority patent/DE102004010156A1/de
Priority claimed from DE102004020410A external-priority patent/DE102004020410B4/de
Priority claimed from DE102004046226A external-priority patent/DE102004046226A1/de
Application filed by Heraeus Kulzer GmbH filed Critical Heraeus Kulzer GmbH
Publication of US20080264809A1 publication Critical patent/US20080264809A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/20—Methods or devices for soldering, casting, moulding or melting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
    • A61C5/62—Applicators, e.g. syringes or guns
    • A61C5/64—Applicators, e.g. syringes or guns for multi-component compositions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/0026—Syringes or guns for injecting impression material; Mixing impression material for immediate use
    • 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
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
    • B01F27/2712—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator provided with ribs, ridges or grooves on one surface
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00503—Details of the outlet element
    • B05C17/00516—Shape or geometry of the outlet orifice or the outlet element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00553—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with means allowing the stock of material to consist of at least two different components
    • B05C17/00566—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with means allowing the stock of material to consist of at least two different components with a dynamic mixer in the nozzle
    • 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
    • B01F2101/2305—Mixers of the two-component package type, i.e. where at least two components are separately stored, and are mixed in the moment of application

Definitions

  • the invention relates to a system having low flow resistance, in particular for intrinsically viscous pastes such as dental materials of various consistencies, dynamic mixers and mixing elements suitable for this purpose, the production of dental impression materials, and methods for mixing components of impression materials, in particular polyether impression materials, and the use of a chamber mixer.
  • Multi-component mixed systems for product end users have become widespread, particularly in the dental field.
  • these involve hand-operated devices for double cartridges by which materials in relatively small quantities and having low viscosities are mixed in a static mixer.
  • motorized mixing devices which, in addition to material conveying, also drive a dynamic mixer having rotating mixing elements. Materials from cartridges as well as from foil bags may be processed in these devices.
  • the devices of this type which in the meantime have become widely used in the dental field, are directed to two components in a mixing ratio of 5:1.
  • the mixing energy is generated by the rotating interior part of the mixer, which admixes the two components into a homogeneous mass when they flow through the mixing nozzle.
  • EP 1 072 323 A1 also describes a mixing device for use in the dental field which is capable of processing the components not only in a 5:1 ratio but also in a 1:1 ratio.
  • impression materials having a kneadable consistency constitute a very large percentage of impression materials used in dentistry.
  • this consistency heretofore has hindered their processing in automatic mixing systems.
  • the devices approach their operating limits with regard to discharge of the substances, and on the other hand, due to the high friction the dynamic mixer causes undesired heat to be introduced into the product.
  • the reaction rate of the multi-component pastes is greatly dependent on temperature. Such pastes remain in the paste-like state for sufficiently long periods at room temperature, and then as the result of the higher temperature in the mouth are rapidly cured to form an elastomer.
  • the introduction of heat during mixing, which is different for each type of device results in formation of elastomeric fractions even outside the oral cavity, which can lead to a distorted impression.
  • Impression materials used in dentistry are typically two-component masses which crosslink at room temperature to form elastomeric reaction products. These masses are based primarily on crosslinkable silicones or crosslinkable polyethers.
  • chemically curing pastes are provided in double cartridges or tubular bags, which the user simultaneously meters, conveys, and mixes in the device.
  • the mixing is performed by mixing attachments, for example dynamic mixers, connected to the double cartridges or tubular bags.
  • mixing attachments for example dynamic mixers
  • Examples of such mixers are described, for example, in DE 199 51 504 A1, DE 199 47 331 C2, DE 101 12 904 A1, DE 100 43 489 A1, and DE 100 15 133 C1.
  • An object of the present invention is to provide such a mixing attachment or dynamic mixer.
  • the flow perturbation elements typically used in process equipment engineering are installed on the outer walls of the tube or vessel.
  • the flow perturbation elements are injection-molded parts made of plastic, intended for disposable use and preferably comprising the fewest possible parts and being simple to manufacture.
  • a flow perturbation element for the wall of the mixer housing cannot be manufactured using simple injection molds.
  • Extensions of the shaft diameter which revolve around the mixer shaft have proven to be easily designed flow perturbation elements. These diameter extensions which project radially into the mixing chamber reduce the flow cross section at this location, and thereby force the paste from the plug flow and temporarily increase the flow rate, and thus the shear, at this location.
  • helical mixers are typically used which for many years have proven to be suitable for mixing materials for impressions and bite registration.
  • chamber mixers in which multiple chambers are arranged behind and adjacent to one another. The material flow is divided into multiple strands by means of connecting openings between the chambers, and these strands are recombined and intermixed.
  • These mixers are known, for example, from U.S. Pat. No. 5,851,067 and U.S. Pat. No. 5,944,419, and are available for cartridges used for dental impression materials. However, since they do not provide improved mixing for use with silicone impression materials, these mixers have not seen widespread use.
  • chamber mixers are known from EP 1 426 099 A1.
  • the chamber mixers have at least two inlet openings, corresponding to the number of components to be mixed, and one outlet opening, and extend essentially between the inlet openings and outlet opening, whereby the number of chambers arranged one behind the other in the longitudinal direction is generally much larger than the number of chambers arranged side by side perpendicular to the longitudinal axis.
  • the mixing quality of the extruded and mixed impression material may be evaluated by chopping off, in a direction transverse to the flow direction, the paste strand exiting the mixer in the early stage of crosslinking.
  • the cut surface reveals the formation of strips resulting from the presence of layers of different crosslinking states.
  • An object of the present invention is to improve the reliability of known systems, methods, mixers, and mixer elements for mixing dental impression materials made of polyether, and to reliably manage the known problems in particular with regard to the mixing quality and pressure load for high-viscosity components.
  • the object of the present invention in particular is to develop a dynamic mixer for existing mixing devices which balances out fluctuations in the mixing ratio and at the same time provides satisfactory mixing for all consistencies used in the dental field without generating excessive heat in the product.
  • Possible approaches to achieving the object are represented by mixers in which a buffer chamber is present for receiving the multiple components which are initially needed in greater quantities. There is no separation of the buffer chamber and mixing chamber.
  • back-curing and component lag are avoided by a buffer chamber having a deflecting element between the inlet opening and the mixing chamber.
  • a further preferred embodiment consists in providing devices in which at the start, a portion of the component is introduced into a chamber which can only be ventilated, but which has such narrow gaps or holes that the paste cannot flow through.
  • This “dead” chamber does not represent a flow duct.
  • a channel may be provided for introducing the second component in order to ensure the equality of the ratios in both ducts. However, this does not diminish the retaining effect of the other ducts/chambers.
  • At least a portion of the inlet opening may be covered by a stationary deflection element.
  • a buffer chamber which is filled by a specialized configuration of the stationary deflection element and which is not suited for material flow because of the small size of the ventilation opening located at its end is advantageous for some consistencies.
  • the cross-sectional area of the mixer shaft should not be greater than 1 ⁇ 5 of the internal cross section of the chamber section thus equipped.
  • the distance between the mixer shaft and the chamber section may thus be set to at least 4 mm without unnecessarily increasing the external diameter and thus the volumetric capacity.
  • the mixer according to the invention may also produce adequate mixing quality, even for low viscosities.
  • the side of the mixing elements oriented toward the chamber section may be at least partially beveled or rounded at parts of their edge facing away from the directions of conveying flow and rotation.
  • a further improvement in the mixing quality is achieved by also introducing the second component into the mixing chamber over the entire available radial width of the surface of the closing part facing the mixing chamber.
  • the inlet opening is widened to form a channel which in a more or less curved or angled manner extends to the greatest possible extent from the mixer shaft opening to the chamber section.
  • At least a portion of the mixer axis located between the mixing blade planes has an expansion 14 , 15 which narrows the flow cross section.
  • a dynamic mixer comprising a substantially cylindrical chamber section, at least in part, and having a discharge opening at the front end of the chamber section having a closing part situated at the rear end of the chamber section, with inlet openings for individual components to be introduced as well as a central opening for a mixer shaft which is rotatable about its longitudinal axis in the chamber section, having two planes axially positioned one behind the other, each having at least two mixing blades radially positioned one behind the other, at least a portion of the mixer axis located between the mixing blade planes ( 9 ) having an expansion of the mixer axis which narrows the flow cross section.
  • At least a portion of the mixer axis located between the mixing blade planes has a wall that runs eccentrically in the radial direction.
  • a dynamic mixer comprising a substantially cylindrical chamber section, at least in part, and having a discharge opening at the front end of the chamber section and having a closing part situated at the rear end of the chamber section with inlet openings for individual components to be introduced as well as a central opening for a mixer shaft which is rotatable about its longitudinal axis in the chamber section, having two planes axially positioned one behind the other, each having at least two mixing blades radially positioned one behind the other, at least a portion of the mixer axis located between the mixing blade planes having a wall that runs eccentrically in the radial direction.
  • a dynamic mixer comprising a chamber section with a discharge opening at the front end of the chamber section, and having a closing part situated at the rear end of the chamber section with inlet openings for individual components to be introduced, as well as a central opening for a mixer shaft which is rotatable about its longitudinal axis in the chamber section, whereby the mixing blade closest to the closing part extends over only a portion of the surface formed by the closing part, and the base plate for the closing part contains at least one flow perturbation element running in the flow direction and opposite the direction of rotation.
  • the dynamic mixer has a substantially cylindrical chamber section, at least in part, and a mixer shaft
  • the expansion in general is designed in such a way that the mixer axis outwardly deviates from the cylinder shape at the particular location.
  • the expansion may be an arch, for example, or may project in a wedge shape from the mixer axis, so that the cross section of the expansion has a polygonal or circular cross-sectional shape.
  • the side of the expansion projecting opposite the chamber section may be beveled or rounded.
  • the expansion may also be designed so that the mixer axis deviates from the cylindrical shape at the particular location in such a way that an overall hemispherical or hemiellipsoidal cross section results.
  • All deviations from the cylindrical shape may also be offset along the mixer axis, so that different mixing planes may have differently situated or shaped deviations.
  • the mixer shaft may also have a design that is circular or disk-shaped in sections, and may have planes that are eccentrically offset with respect to one another. For an eccentrically offset configuration of the planes, however, these may also have a polygonal design.
  • flow perturbation elements for the closing part are provided partially circumferentially around the mixer shaft in a block, wedge, or ramp shape, the flow perturbation elements in cooperation with the mixing blades facing the inlet openings may prevent direct product flow of the component into the inlet opening for the other component after the mixing process is completed.
  • systems for producing dental impression materials are provided in which dental materials of different consistencies are extruded from supply containers into the mixer while being kept isolated from one another. It is suitable for the outlet openings of the supply containers to be matched to the inlet openings of the mixer.
  • This system comprises a plurality, in particular at least three, preferably at least four of the following elements:
  • dental materials of different consistencies are extruded from supply containers and mixed to form an impression material.
  • the dental materials are extruded from the supply containers into a mixer, the mixer having inlet openings matched to the outlet openings of the supply containers, and implementing a plurality, in particular at least three, preferably at least four of the following features:
  • a static chamber mixer is suitable for mixing the components of polyether impression materials.
  • Polyether impression materials are understood to mean, among other things, products based on silane-terminated polyethers as well as products based on aziridine-terminated polyethers.
  • a method is also provided for mixing the components of polyether impression materials, in which a static chamber mixer is used. This represents the first use of a static chamber mixer for mixing polyether impression materials, in particular the first use of a static chamber mixer for mixing impression materials based on silane-terminated polyethers, or the use of a static chamber mixer for mixing impression materials based on aziridine-terminated polyethers.
  • polyether impression materials may be mixed particularly well using static chamber mixers, as known from EP 1 426 099 A1, for example, the content of which is expressly referenced with respect to the content of the disclosure of the present invention.
  • the widely used silicone impression materials may likewise be mixed well using static chamber mixers as well as static helical mixers.
  • the polyether impression materials finding increasing use in recent times unexpectedly may be mixed significantly better with chamber mixers than with helical mixers. This is unexpected to one skilled in the art, in that such a person initially would assume that both materials have similar mixing capabilities.
  • This method according to the invention may be carried out, for example, using a mixer according to EP 1 426 0999 [sic; 1 426 099] A1.
  • the impression materials used are known from EP 269 819 B1, for example.
  • a conventional double-chamber cartridge having in both of its chambers the two starting components of a silane-terminated polyether impression material to be mixed, in a 2:1 volume ratio, is connected to the inlet opening of the chamber mixer. The components are extruded through the chamber mixer by pressing on the cartridge and are thus mixed. It has been shown that the two components are mixed to form a homogeneous product.
  • the strip buildup which occurs when helical mixers are used (the product may be divided into layers in an early state of crosslinking) is completely or essentially completely absent for chamber mixers.
  • the formation of strips may also be avoided for impression materials based on aziridine-terminated polyethers.
  • FIG. 1 shows a mixer having the buffer chamber 22 ;
  • FIG. 2 shows the rounded end 20 of the buffer chamber
  • FIG. 3 shows, in a view rotated by 90° with respect to FIG. 2 , the beveled edge 19 of the buffer chamber 22 ;
  • FIGS. 4 and 5 show the variant in which the end of the buffer chamber does not run at right angles to the plane of rotation
  • FIGS. 6 through 8 show deflection elements
  • FIGS. 9 and 10 show the buffer chamber 22 between the inlet opening 7 and the mixing chamber 21 with ventilation slits 50 , 51 , 52 ;
  • FIG. 11 shows ventilation openings 53 , 54 which are shaped as round or polygonal holes
  • FIGS. 12 through 15 show design possibilities for the mixing elements
  • FIG. 16 shows a dynamic mixer for dental materials according to the invention, in cross section
  • FIGS. 17 and 18 show the mixer axis in cross section, with a circular and square design, respectively, of the expansion
  • FIGS. 19 and 20 show embodiments and positionings of the oval mixer axis and of the mixing blades
  • FIGS. 21 and 22 show asymmetrical configurations of the circular mixer axis
  • FIG. 23 shows the configuration of the flow perturbation elements on the closing part
  • FIG. 24 shows the embodiment of the closing part with flow perturbation elements, in cross section.
  • FIG. 25 shows the dynamic mixer in the front view, comprising a chamber section 1 , mixer shaft 8 , and closing part 5 having the two inlet openings 6 , 7 and the positioning aid 40 .
  • FIG. 26 shows the dynamic mixer in the front view, placed on the two outlet supports 44 , 46 for the tubular bags 47 , 48 , in which the two outlet supports 44 , 46 for the tubular bags 47 , 48 have different diameters, and the outlet support 44 is externally 39 placed on the inlet opening 6 in a sealing manner.
  • FIG. 27 shows the dynamic mixer in the side view, placed on the outlet support 44 for the tubular bag 47 , in which the outlet support 44 is externally 39 placed on the inlet opening 6 in a sealing manner past the positioning aid 40 .
  • FIG. 28 shows the dynamic mixer in the front view, placed on the two outlet supports 45 , 46 for the tubular bags 47 , 48 , in which the two outlet supports 44 [sic; 45 ], 46 for the tubular bags 47 , 48 have different diameters, and the outlet support 45 is internally 38 inserted into the inlet opening 6 in a sealing manner.
  • FIG. 29 shows a closing part 5 having two bar-shaped positioning aids 40 in the vicinity of the inlet opening 6 without contacting same.
  • FIG. 30 shows a closing part 5 having two strip-shaped positioning aids 41 in the vicinity of the inlet opening 6 without contacting same.
  • FIG. 31 shows a closing part 5 having circular positioning aids 42 around the inlet opening 6 without contacting same.
  • FIG. 32 shows a closing part 5 having semicircular positioning aids 43 in the vicinity of the inlet opening 6 without contacting same.
  • One embodiment of the invention is a dynamic mixer, in particular for dental materials of various consistencies, comprising a chamber section having a discharge opening at the front end of the chamber section, and a closing part situated at the rear end of the chamber section having a base plate, inlet openings for individual components to be introduced, and a central opening for a mixer shaft which is rotatable about its longitudinal axis in the chamber section, the inlet opening 7 for the component (“multi-component”) present in the greater quantity expanding outside the region of the chamber which is accessible to the mixing elements to a buffer reservoir 8 .
  • At least one of the following features is preferably present:
  • a further embodiment is a dynamic mixer, in particular for dental materials of various consistencies, comprising a chamber section 1 having a discharge opening 2 at the front end 3 of the chamber section, and a closing part 5 situated at the rear end 4 of the chamber section having inlet openings 6 , 7 for individual components, which are present in quantity ratios different from 1, to be introduced and mixed, and a central opening for a mixer shaft 8 which is rotatable about its longitudinal axis in the chamber section 1 , the dynamic mixer having a buffer chamber 22 , situated between the inlet opening 7 and the mixing chamber 21 , which is not used as a flow duct for one of the components.
  • a further embodiment is a dynamic mixer, in particular for dental materials of various consistencies, comprising a chamber section 1 having a discharge opening 2 at the front end 3 of the chamber section, and a closing part 5 situated at the rear end 4 of the chamber section having inlet openings 6 , 7 for individual components, which are present in quantity ratios different from 1, to be introduced and mixed, and a central opening for a mixer shaft 8 which is rotatable about its longitudinal axis in the chamber section 1 ,
  • a further embodiment is a dynamic mixer, in particular for dental materials of various consistencies, comprising a chamber section 1 having a discharge opening 2 at the front end 3 of the chamber section, and a closing part 5 situated at the rear end 4 of the chamber section having inlet openings 6 , 7 for individual components, which are present in quantity ratios different from 1, to be introduced and mixed, and a central opening for a mixer shaft 8 which is rotatable about its longitudinal axis in the chamber section 1 ,
  • the mixing elements have different designs. Mixing elements 23 having an impact surface 24 in the direction of rotation, parallel to the mixer axis, and being narrower 25 , 27 to the rear, at least in part, have proven to be suitable.
  • At least a portion of the mixing elements 23 on the mixer shaft 22 to partially generate a mass flow opposite the conveying direction by the fact that at least one of the surfaces 26 running in the radial plane is beveled away from the product flow.
  • the mass to be mixed may be conveyed alternatingly in the radial direction from the outside to the inside, and vice versa.
  • At least a portion of the mixing elements 28 attached to the mixer shaft 22 may be beveled and axially positioned with respect to one another in such a way that they form a conical flow duct 31 , 32 ; or that
  • connections 33 , 34 , 35 , 36 of the mixing elements 29 , 30 are advantageously established on the radial plane, alternatingly oriented outward and inward.
  • connection 33 , 34 of the mixing element 30 may describe an arc 37 with respect to the product flow side.
  • FIG. 16 shows the dynamic mixer, comprising a substantially cylindrical chamber section 1 , at least in part, having a discharge opening 2 at the front end 3 of the chamber section, and a closing part 5 situated at the rear end 4 of the chamber section having inlet openings 6 and 7 for individual components to be introduced, and a central opening for a mixer shaft 8 which is rotatable about its longitudinal axis in the chamber section 1 , having at least two planes 9 axially positioned one behind the other, each having at least two mixing blades 10 radially positioned one behind the other, with the feature that at least a portion of the mixer axis 8 located between the mixing blade planes 9 has an expansion 14 , 15 on the mixer axis 8 which narrows the flow cross section 54 .
  • FIG. 17 shows the polygonal (in this case square) design of the expansion 14 , as well as the mixing blades 10 .
  • FIG. 18 shows a circular design of the expansion 15 , corresponding to FIG. 17 .
  • FIG. 19 illustrates the mixing axis, which is provided with radially offset expansions in planes A-D. This is clearly identified by the projections in planes B and D.
  • FIG. 20 shows the corresponding cross-sectional views of planes A-D, the axis 57 with the expansions having an oval cross section.
  • FIG. 21 shows, corresponding to the illustration in FIG. 19 , the variant in which the axis has eccentrically positioned disks with spherical cross sections in the planes E-H.
  • FIG. 21 also illustrates how the mixing blade 16 closest to the closing part 5 extends over only a portion of the surface formed by the closing part 5 , and the base plate of the closing part 5 contains at least one flow perturbation element 17 running in the flow direction, opposite the direction of rotation.
  • the flow perturbation elements 17 situated on the base plate of the closing part 5 extend substantially radially over the region of the base plate hollowed out by the mixing blades 17 , and/or substantially axially up to the mixing blades 17 .
  • the flow perturbation elements 17 situated on the base plate of the closing part 5 extend so far in the direction of rotation that, together with the mixing blades 16 , in any resting position of the mixing axis 8 they prevent direct product flow on the base plate between the two product inlet openings 6 and 7 .
  • the surfaces of the flow perturbation elements 17 facing the direction of rotation preferably have an angle of inclination of 10° to 80° relative to the base plate.
  • the surface(s) of the flow perturbation elements 17 facing away from the direction of rotation preferably have an angle of inclination of 80° to 90° relative to the base plate.
  • FIG. 22 the individual planes E-H are illustrated in cross section, clearly showing the offset configuration of the disks on the axis 58 .
  • FIG. 23 shows an embodiment in which two flow perturbation elements 17 running in the flow direction, opposite the direction of rotation, are situated on the base plate of the closing part.
  • the flow perturbation elements may extend substantially radially over the region of the base plate hollowed out by the mixing blades 16 , or substantially axially up to the mixing blades 16 . It is desirable for the flow perturbation elements 17 situated on the base plate of the closing part 5 to extend so far in the direction of rotation that, together with the mixing blades 16 , in any resting position of the mixing axis 8 they prevent direct product flow on the base plate between the two product inlet openings 6 , 7 .
  • the surfaces of the flow perturbation elements 17 facing the direction of rotation generally have an angle of inclination of 10° to 80° relative to the base plate.
  • the surfaces of the flow perturbation elements 17 facing away from the direction of rotation advantageously have an angle of inclination of 80° to 90° relative to the base plate in the direction of rotation.

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  • Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US10/590,760 2004-02-27 2005-02-23 Method for the Production of Dental Moulding Materials and Device Therefor Abandoned US20080264809A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE102004010156.6 2004-02-27
DE102004010156A DE102004010156A1 (de) 2004-02-27 2004-02-27 Dynamischer Mischer mit geringem Durchflusswiderstand
DE102004020410A DE102004020410B4 (de) 2004-04-23 2004-04-23 Dynamischer Mischer für strukturviskose Pasten
DE102004020410.1 2004-04-23
DE102004046226.7 2004-09-22
DE102004046226A DE102004046226A1 (de) 2004-09-22 2004-09-22 Verfahren zum Mischen der Komponenten von Polyetherabformmassen
PCT/EP2005/001876 WO2005082549A2 (fr) 2004-02-27 2005-02-23 Procede de fabrication de masses de moulage dentaires et dispositifs permettant la mise en oeuvre dudit procede

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US20150136806A1 (en) * 2013-09-05 2015-05-21 Dxm Co., Ltd. Impression mixing tip
CN106061595A (zh) * 2013-12-04 2016-10-26 米尔鲍尔科技有限公司 动态的混合器和其应用
US20170028367A1 (en) * 2015-07-31 2017-02-02 Phillip Phung-I Ho Dynamic mixer head
US9656224B2 (en) 2011-02-28 2017-05-23 Sulzer Mixpac Ag Dynamic mixer

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EP2441413A1 (fr) * 2010-10-18 2012-04-18 3M Innovative Properties Company Mélangeur pour former un matériau dentaire, système comprenant le mélangeur et procédé de montage du mélangeur

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US9656224B2 (en) 2011-02-28 2017-05-23 Sulzer Mixpac Ag Dynamic mixer
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US20170028367A1 (en) * 2015-07-31 2017-02-02 Phillip Phung-I Ho Dynamic mixer head
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WO2005082549A2 (fr) 2005-09-09
EP1720664A1 (fr) 2006-11-15

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