EP0507737A1 - Verfahren und dynamische Mischvorrichtung - Google Patents

Verfahren und dynamische Mischvorrichtung Download PDF

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Publication number
EP0507737A1
EP0507737A1 EP92810227A EP92810227A EP0507737A1 EP 0507737 A1 EP0507737 A1 EP 0507737A1 EP 92810227 A EP92810227 A EP 92810227A EP 92810227 A EP92810227 A EP 92810227A EP 0507737 A1 EP0507737 A1 EP 0507737A1
Authority
EP
European Patent Office
Prior art keywords
components
mixing
detachable
cartridge
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.)
Granted
Application number
EP92810227A
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English (en)
French (fr)
Other versions
EP0507737B1 (de
Inventor
Christian Krumm
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.)
Octal Technologies CH Krumm
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Octal Technologies CH Krumm
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Publication date
Application filed by Octal Technologies CH Krumm filed Critical Octal Technologies CH Krumm
Publication of EP0507737A1 publication Critical patent/EP0507737A1/de
Application granted granted Critical
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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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/88—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with a separate receptacle-stirrer unit that is adapted to be coupled to a drive mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles

Definitions

  • the present invention relates to a method of mixing the various components of a product and to a device comprising a detachable cartridge used for this purpose.
  • a mixer which can be either a static mixer or a dynamic mixer.
  • a static mixer used mainly for relatively fluid products
  • the various components are pressed together through a set of baffles in order to be intimately mixed.
  • a dynamic mixer generally used for more viscous products, the various components are introduced into a mixing chamber where a blade, driven by a stirring movement, is responsible for mixing.
  • the major drawback of the dynamic mixers of the prior art lies in the fact that after extraction of the mixed product from said mixing chamber, a certain amount of said mixed product remains in the chamber and, after a while, changes state under the effect of the chemical reaction.
  • the time required for this change can be very variable, depending on the components used as well as the surrounding conditions; this duration can thus be less than a minute or more than an hour. Therefore, each time the device is stopped for a time greater than the time necessary for the initiation or the completion of the chemical reaction, whether because of the shutdown of the production machine arranged downstream , or due to a temporary absence of the operator, it is necessary to dismantle the dynamic mixer and completely clean the mixing chamber as well as the extraction orifice, in order to remove all the particles of mixed product that have hardened. This cleaning operation can be long and dangerous due to the use of the products or solvents necessary for this purpose.
  • US-A-4,951,843 describes a mixing device comprising a removable mixing chamber portion; a drawback of this device lies in the fact that the mixing blade is independent of the chamber, thereby necessitating separate cleaning of the mixing blade, of the removable portion of the chamber as well as of the non-removable bottom portion of the mixing device. Another drawback of this device is that the components to be mixed are introduced longitudinally through the non-removable bottom portion at a place where the mixing paddle has little effectiveness, thus creating an area where the components mix poorly.
  • a first object of the invention is to propose a method making it possible to facilitate or even eliminate this cleaning operation, this object being obtained by a method corresponding to the characteristics of claim 1.
  • Another object of the invention is to propose a method allowing, by judiciously arranging the component inlet ports in the mixing chamber, to obtain efficient mixing without creating a dead zone; this object is obtained, according to several construction variants, by the characteristics of claims 2 to 6.
  • Yet another object of the invention is to provide a dynamic mixing device capable of carrying out the mixing method according to the invention, which meets the characteristics of claim 7, while a detachable cartridge intended to be used by the device below above, comprises, for several variant embodiments, the characteristics of claims 8 to 13.
  • FIG. 1 shows in perspective, a general view of an installation for mixing a product with two components, comprising a dynamic mixing device according to the invention
  • FIG. 2 represents a part of the mixing device according to a preferred form of the invention on an enlarged scale.
  • An installation for mixing 1 of two components A and B of a product can consist, for example, as seen in FIG. 1, of a reservoir 10 of a first component A, the outlet of which is connected to a volumetric doser 11, as well as to a reservoir 12 of a second component B, the outlet orifice of which is connected to another volumetric doser 13, as well as to a dynamic mixer 2, each of which two orifices d input 20A and 20B is connected to an outlet orifice of a volumetric metering device 11, respectively 13, by pipes, preferably flexible.
  • Component tanks 10 and 12 as well as volumetric dosers 11 and 13 forming part of the state of the technique are not further described here; one can only indicate that they are responsible for supplying the dynamic mixer 2, by its supply orifices 20A and 20B, by component A, respectively B, continuously, intermittently or on demand, being controlled by a device automatic control also part of the prior art and not shown in the figure.
  • the metering devices are of the volumetric type as indicated, they are more generally product distributors known in the art, for example of the volumetric type as shown or of the timed type or else known type; on the other hand, each of said product distributors can be made up of a single element, grouping together the product tank and the metering device.
  • the dynamic mixer as well as the product distributors can also be made up in a single element, thus eliminating the flexible connecting pipes.
  • said installation can be intended to mix more than two components, thereby requiring more than two product distributors.
  • the dynamic mixer 2 comprises a portion of fixing body, preferably consisting of a first portion of fixed body 21B, and a second portion of movable body 21A, the two body portions being connected by a hinge 22 and can therefore be opened, as shown in the figure, or closed as indicated by the arrow.
  • a locking device 23, of known execution, is arranged on the faces of the two portions opposite to those comprising the hinge 22, in order to ensure closing and locking the two body portions 21A and 21B.
  • the body portion 21A and the body portion 21B each comprise a housing, preferably of semi-cylindrical shape 24A, respectively 24B which, when the two portions 21A and 21B are folded over one another, face each other so to compose a housing preferably cylindrical, extending over the entire height of the two said portions.
  • the upper face of each of the portions 21A and 21B comprises a recess 25A, respectively 25B, the usefulness of which will be explained below.
  • Each of the portions 21A and 21B further comprises a pipe 26A, respectively 26B, connected on one side to the inlet orifices 20A, respectively 20B and each opening by a nozzle 27A, respectively 27B in the side wall of the semi-cylindrical housing 24A , respectively 24B.
  • the mixing chamber of the dynamic mixing device consists of a detachable cartridge 3, consisting of a hollow envelope body 30, preferably of cylindrical shape, but which can be of any other suitable shape and the dimensions of which external correspond to the dimensions of the housing disposed in the fixing portion, respectively whose external diameter corresponds to the internal diameter of the cylindrical housing formed by the two semi-cylindrical housings 24A and 24B and whose height corresponds approximately to that of said cylindrical housing.
  • the hollow envelope body 30 has its open upper end, a flange 31, of any section but not circular, extending transversely out of the upper end of the hollow envelope body 30.
  • the shape of the flange 31 is adapted to that of the hollows 25A and 25B, so that said hollow casing body is firmly held inside the cylindrical housing when the two portions 21A and 21B are closed, and that said hollow envelope body can easily be inserted into, or extracted from said cylindrical housing when the two portions 21A and 21B are open.
  • Two orifices 32A and 32B (better visible in FIG. 2), corresponding to the nozzles 27A and 27B, are adjusted to the dimensions of said nozzles and put them in connection with the inner part of said hollow casing body.
  • the lower end of the hollow casing body 30 is closed for the most part, leaving just an outlet orifice 33 also formed in the nozzle.
  • a stirring device 34 consisting of a body with a cylindrical axis 35, of diameter slightly less than the inside diameter of the hollow casing body 30, surmounted by a drive head 36, which may for example be of cylindrical shape, of larger diameter, so that a portion of the ring formed by the outer part of the lower surface of said drive head can rest on the upper face of the flange 31.
  • a diametrical slot 37 is provided on the upper face of the drive head 36, in order to drive said stirring device in rotation, as indicated below.
  • One or more mixing blades 38 are fixed to the lower part of the body of cylindrical axis 35, so as to best use the mixing space located in the lower part of the hollow casing body 30.
  • annular seal 39 fixed close to the lower part of the body of cylindrical axis 35, is intended to seal between the mixing space and the portion of casing body disposed above said mixing space; the annular seal 39 must also allow the rotation of the cylindrical axis body 35 inside the hollow envelope body 30.
  • the detachable cartridge 3 is made of a material resistant to the components to be mixed as well as to the finished product; since it is generally disposable after use, as will be seen below, it can be made of a cheaper material, possibly only resistant for a limited period to the products mentioned above.
  • the dimensions of the stirring space must be adapted to the amount of product required, this amount can be as small as a few hundredths of a milliliter.
  • the dynamic mixer 2 is completed with a drive part 4, visible in FIG. 1, comprising a motor 40, driving an axis 41 by means, for example, of a set of pulleys and belt 42.
  • the lower part of the axis 41 is provided with a drive end 43, comprising a tongue 44 capable of engaging in the diametrical slot 37 of the drive head 36.
  • This drive part 4 is relatively conventional, this is why it is not described more precisely here; the motor 40 is preferably an electric motor controlled by the automatic control device mentioned above.
  • the portion of the fixing body may consist of a single portion, the detachable cartridge 3 being introduced for example by the upper end of a housing arranged inside said single portion; in this case, the drive part 4 is pivoting or sliding relative to said single portion in order to leave the space necessary for the introduction of the detachable cartridge.
  • the axes of the pipes 26A and 27B, respectively the nozzles 27A and 27B introduce radially components inside the brewing space; moreover they are not aligned face to face but the nozzle 27A is located opposite and above the nozzle 27B.
  • the upper part of the brewing space the region where brewing is not as good, is occupied by only one of the components of the mixture, thus avoiding a risk of chemical transformation at this place which could clog up the seal 39 and prevent rotation of the stirring device 34.
  • the component introduced by the upper nozzle will be that present in greater proportion in the mixture or else the base resin of said product, while the lower nozzle will introduce the component intervening in smaller proportion or then the hardener for example.
  • the supply device, the volumetric dosers 11 and 13 respectively, as well as the motor 40 are started by the automatic control device, in order to inject into the mixing space a determined quantity of components A and B and of mix these two components using the stirring paddle (s) 38.
  • the volumetric dosers 11 and 13 will inject a new quantity of the components A and B, this which will eject the mixed product through the outlet port 33, for use in the rest of the process.
  • the automatic control device is programmed so that the mixed product leaves the outlet orifice 33 as required, either drop by drop at a determined rate, or in a continuous stream, or then on demand.
  • the detachable cartridge comprising the hollow casing body and the stirring body is designed so that it can be produced in quantity at low cost; thus the cleaning operation is directly eliminated, the detachable cartridge being thrown away when it is dirty.
  • one of the products introduced into the brewing space is not a component directly involved in the composition of the finished product, but is, for example, a diluent, a solvent or any product that may be loaded. delay the onset of the chemical reaction or rinse the mixing space before or after use; in this case, the automatic process control device will control the introduction of any such product independently of the introduction of the components necessary for the manufacture of the finished product.
  • the mixing device has been described with an inlet nozzle opening out from the fixed body portion and another inlet nozzle opening out from the movable body portion; it is obvious that it is also possible to unblock the inlet nozzles from the same body portion, whether it is the fixed body portion or the movable body portion.
  • the inlet orifices of the components in the cartridge may not be necessary for the inlet orifices of the components in the cartridge to be arranged in successive planes; in this case they could be arranged side by side in the same plane.
  • the radial entry of the components can sometimes prove to be unsuitable for proper control of the process; in this case, the orifices can be designed so that the components do not penetrate radially but obliquely, preferably directed towards the bottom of the mixing chamber.
  • Another variant of the device described comprises an improvement making it easier to introduce the tongue 44 of the drive end 43 into the slot 37 of the drive head 36, by providing that said drive end is sliding on the axis 41.
  • the method, the mixing device and the cartridge according to the invention therefore make it possible to facilitate the use of products with several components in avoiding the operation of cleaning the mixing chamber of the mixer after a shutdown for a certain period, thus leading to an increase in the production rate, respectively a reduction in production costs.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP92810227A 1991-03-28 1992-03-27 Verfahren und dynamische Mischvorrichtung Expired - Lifetime EP0507737B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH953/91 1991-03-28
CH95391 1991-03-28

Publications (2)

Publication Number Publication Date
EP0507737A1 true EP0507737A1 (de) 1992-10-07
EP0507737B1 EP0507737B1 (de) 1995-08-09

Family

ID=4199019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810227A Expired - Lifetime EP0507737B1 (de) 1991-03-28 1992-03-27 Verfahren und dynamische Mischvorrichtung

Country Status (2)

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EP (1) EP0507737B1 (de)
DE (1) DE69203912T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8246783B2 (en) 2002-08-01 2012-08-21 Shw Casting Technologies Gmbh Device and method for surface processing webs of paper and similar endless non-wovens by means of a heatable roller

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1488510A (fr) * 1965-07-26 1967-07-13 Wacker Chemie Gmbh Procédé pour effectuer un mélange continu
DE1948998A1 (de) * 1969-09-27 1971-04-22 Bayer Ag Mischkopf zum Vermischen schnell miteinander reagierender chemischer Komponenten
US4889432A (en) * 1989-02-07 1989-12-26 Roosevelt Patterson Dental mixer apparatus
US4951843A (en) * 1989-08-16 1990-08-28 Sealant Equipment & Engineering, Inc. Disposable mixing chamber liner and paddle for a dynamic mixing and dispensing gun
EP0403402A1 (de) * 1989-06-14 1990-12-19 Salomon S.A. Mischvorrichtung für die Herstellung eines Injektionsproduktes für die Realisation einer anatomischen Polsterung in einem Schuh

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1488510A (fr) * 1965-07-26 1967-07-13 Wacker Chemie Gmbh Procédé pour effectuer un mélange continu
DE1948998A1 (de) * 1969-09-27 1971-04-22 Bayer Ag Mischkopf zum Vermischen schnell miteinander reagierender chemischer Komponenten
US4889432A (en) * 1989-02-07 1989-12-26 Roosevelt Patterson Dental mixer apparatus
EP0403402A1 (de) * 1989-06-14 1990-12-19 Salomon S.A. Mischvorrichtung für die Herstellung eines Injektionsproduktes für die Realisation einer anatomischen Polsterung in einem Schuh
US4951843A (en) * 1989-08-16 1990-08-28 Sealant Equipment & Engineering, Inc. Disposable mixing chamber liner and paddle for a dynamic mixing and dispensing gun

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8246783B2 (en) 2002-08-01 2012-08-21 Shw Casting Technologies Gmbh Device and method for surface processing webs of paper and similar endless non-wovens by means of a heatable roller

Also Published As

Publication number Publication date
DE69203912D1 (de) 1995-09-14
EP0507737B1 (de) 1995-08-09
DE69203912T2 (de) 1996-04-04

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