EP0451747B1 - Pétrisseur-mélangeur travaillant en continu - Google Patents

Pétrisseur-mélangeur travaillant en continu Download PDF

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Publication number
EP0451747B1
EP0451747B1 EP91105497A EP91105497A EP0451747B1 EP 0451747 B1 EP0451747 B1 EP 0451747B1 EP 91105497 A EP91105497 A EP 91105497A EP 91105497 A EP91105497 A EP 91105497A EP 0451747 B1 EP0451747 B1 EP 0451747B1
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EP
European Patent Office
Prior art keywords
kneading
disk
elements
bars
rotation
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
EP91105497A
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German (de)
English (en)
Other versions
EP0451747A1 (fr
Inventor
Walther Dr. Ing. Schwenk
Jörg Dipl.-Ing. List
Winfried Dr. Ing. Dötsch
Pierre Ing. Htl Liechti
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List AG
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List AG
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Publication date
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Publication of EP0451747A1 publication Critical patent/EP0451747A1/fr
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Publication of EP0451747B1 publication Critical patent/EP0451747B1/fr
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/707—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms the paddles co-operating, e.g. intermeshing, with elements on the receptacle wall

Definitions

  • the invention relates to a continuously operating mixer kneader for the thermal treatment of products in a liquid, pasty and / or powdery state in a housing, wherein in this housing axially and concentrically arranged a kneader shaft with disk elements and kneading bars and rotating about an axis of rotation is arranged, which causes the transport of the product in the direction of transport, and kneading counter-elements are provided fixedly on the housing between the disc elements, the disc elements also being arranged in disc planes perpendicular to the kneader shaft and forming free sectors between them, which form kneading spaces with the disc plane of adjacent disc elements.
  • a generally horizontal mixer kneader normally works with medium product fill levels between 50% and 80%. This makes it possible to supply or remove gases or vapors during the process.
  • the inventor has set himself the task of adapting the arrangement of kneading bars on the kneader shaft systematically to a desired axial transport, a desired degree of filling along the kneader and thus a desired residence time and residence time distribution and the intensity of the mixing and kneading action.
  • the kneading bars are arranged on a positive or negative offset line in the knee spaces between two disc elements are, with a "positive" offset line each kneading bar assigned to each two disc elements against the direction of rotation followed by a kneading bar assigned to the next two disc elements of the kneading space following in the transport direction, while the "negative" offset line runs in the direction of rotation or transport direction.
  • An essential finding of the present invention is that both the transport speed and thus the dwell time of the product in the mixing kneader as well as the intensity of the mixing and kneading effect are significantly influenced by the arrangement of the kneading bars to the disk elements and by the offset of the kneading bars on the kneader shaft. If the kneading bars are arranged on a negative offset line, a disk element pair with a kneading bar in the transport direction and a pair of disk elements without kneading bars follow in the opposite direction of rotation. In this area, both the transport of the product is inhibited and the kneading effect is reduced, since the kneading here is only carried out by the disc elements, possibly in interaction with the kneading counter elements.
  • This alternative arrangement of the kneading bars allows the different flow properties of the products to be taken into account; it is even possible to take into account the changing physical states of the product between an inlet and an outlet.
  • a stronger or weaker backmixing and consequently a broader or narrower residence time distribution can be used, for example, to influence chemical reaction processes or mixing and kneading processes in the desired manner. For example, short-term dosing fluctuations are compensated for.
  • Another possibility is to influence the degree of filling profile along the kneader and e.g. to achieve a lower degree of filling locally under a vapor discharge nozzle, for the purpose of better vapor removal.
  • the kneading bars are preferably not located in the middle between two disk elements, but are arranged in front of or behind the disk elements. While the product remains trapped between the disk elements despite the kneading effect of the kneading bar between two disk elements when the kneading bar is arranged, it can adapt to the direction given by the kneading bar when leading or trailing. This can accelerate the transport.
  • the number of disk elements which are arranged within a disk plane around the kneader shaft plays only a minor role in the present invention.
  • disk elements which have an angular offset of 120 °. However, fewer or more disk elements can also be provided.
  • larger free sectors are to be formed between the disk elements, by means of which the axial transport and the mixing are likewise improved in a targeted and desired manner.
  • only one disk element per disk level can be present on the kneader shaft.
  • the larger non-binding sectors lie on a positive or negative sector line.
  • These positive or negative sector lines are arranged analogously to the positive or negative offset lines of the kneading bars. This means that in the case of a negative sector line, the larger free sectors of neighboring knee spaces follow one another in the opposite direction of rotation, opposite to the direction of rotation. In contrast, the larger free sectors on the positive sector line follow each other in the opposite direction of rotation and in the direction of transport.
  • the product is transferred from one non-binding sector to another and that of course the transport is accelerated.
  • the fastest transport is ensured by combining the arrangement of the kneading bars on a positive offset line and the arrangement of the non-binding sectors on a positive sector line.
  • the product transport considerably reduces the arrangement of kneading bars on a negative offset line and the arrangement of sectors on a negative sector line.
  • a mix of positive offset line and negative sector line and positive sector and negative offset line is also possible.
  • the present invention allows the axial transport behavior and the backmixing (residence time distribution) of a product to be influenced in a desired manner in continuous operation and as a function of the flow behavior.
  • a mixing kneader has a mostly horizontally arranged housing 1 with end walls 10 and 15.
  • a kneader shaft 20 rotates in this housing 1 and is supported with the pins 21 and 22 in the bearings 12 and 17 on both sides of the housing 1.
  • a heating jacket for heating the housing is identified by 2.
  • the kneader shaft 20 is also preferably heated or cooled in a known manner, with an inlet 29 and an outlet 30 for a heating medium being provided on a corresponding sealing head.
  • the kneader shaft 20 is driven by a motor (not shown in more detail) by means of a V-belt placed over a V-belt pulley 23, a transmission 24 being engaged between the V-belt pulley 23 and the kneader shaft 20.
  • the mixer kneader shown in Figure 1 is intended for continuous operation.
  • the product is filled into the interior of the housing through an inlet nozzle 3 and removed via the outlet nozzle 4.
  • various nozzles 5 are provided on the top for removing vapors.
  • an overflow weir 32 is provided in a flange connection 31 in front of the outlet connection 4 in the exemplary embodiment of a mixing kneader.
  • Disc elements 25 are located on the rotating kneader shaft 20 at regular intervals, each having a disc bar 26 placed thereon. Between the individual sections of disk elements, the disk bars 26 are separated from one another by gaps 34, so that 20 kneading counter-elements 33 can be passed through during operation of the kneader shaft. For this purpose, the kneading counter-elements 33 are inserted into the housing 1 with a flange 35, but can also be welded directly.
  • each kneading counter element 33 consists of a fastening flange 35, a neck 36, a kneading arm 37 which extends approximately axially parallel to the housing wall, a disk scraper 38 arranged parallel to the disk elements and a shaft scraper 39 resting on the shaft.
  • this is Design of the kneading counter element 33 selected only as an example. Other arrangements are of course also conceivable, as shown for example in CH-A-661 450, EP-A-0 220 575 and DE-A-23 49 106.
  • Kneading bars 40 are located on the kneader shaft between the individual levels which are formed by the disk elements 25.
  • three disk elements 25a, 25b and 25c are arranged in each disk plane.
  • the respective disk bars 26 are set at a certain angle w to an axis-parallel line 41, which means that a transport in the direction x from the inlet nozzle to the outlet nozzle takes place.
  • the kneading bars 40 are located between two levels of disk elements 25, two of these levels being indicated by the reference number 42, for example in FIG.
  • the kneading bars 40 are located between two disk planes 42 and there in the area between successive disk elements 25, whereby these kneading bars 40 can assume a variable position. In the one position shown, the kneading bars 40 are slightly ahead of two disk elements 25, i.e. close to disk bars 26. These kneading bars are identified in the present exemplary embodiment by 40a.
  • the kneading bars 40b are trailing to the disk elements 25, so that they are relatively far away from the disk bars 26 of the following disk elements.
  • This possibility of positioning the kneading bars 40 in the region between two disk elements 25a and 25b is characterized in FIG. 2 by the angle ⁇ .
  • the displacement of the kneading bars 40 from one kneading space 28 to a next kneading space 28 between two disc planes 42 is important.
  • the offset takes place against the direction of rotation z, the offset being referred to here as positive.
  • the offset is also indicated by the dash-dotted lines 43. This arrangement accelerates the transport of products in the transport direction x.
  • the number of disk elements 25 is three per disk plane 42. With a regular arrangement, this results in an angular offset ⁇ of 120 ° between the disk elements 25.
  • the arrangement of disk elements 25 and kneading counter-elements 33 is the same as in FIG. 2.
  • the two exemplary embodiments differ with regard to the positioning of kneading bars 40 to disk elements 25 or gap 34.
  • the kneading bars 40a are here in the kneeling direction, for example successively staggered from the kneading chamber 28 to the kneading chamber 28 in the transport direction x between two disc planes 42. This results in a negative offset line 44, as is indicated by dash-dotted lines.
  • the kneading bars 40 are arranged here as leading kneading bars 40a or as trailing kneading bars 40b, which are only shown in broken lines. It can be clearly seen in this embodiment that the transport effect is more negative than in the embodiment according to FIG. 2.
  • each kneading bar in the following kneading space 28 between two disk elements is followed by a kneading bar.
  • the product is transferred from kneading bars to kneading bars, which speeds up transport.
  • a kneading bar 40 in the transport direction x in the following kneading space 28 between two disc planes 42 is followed only by a gap 34 without kneading bars.
  • the product is therefore not transferred from kneading bars to kneading bars, which delays the transport.
  • FIG. 4 A further possibility of assigning kneading bars 40 to disk elements 25 and thus influencing the axial transport, the dwell time and the intensity of the mixing and kneading action is shown in FIG. 4.
  • a large number of kneading bars are provided, while one disk element has been left out per disk plane 42.
  • the gap which the disk element leaves in the disk plane 42 is referred to as sector 47 and, in this exemplary embodiment, follows one another successively in the direction of rotation z from the kneading chamber 28 to the kneading chamber 28, as represented by the broken line 45. This line is called the negative sector line.
  • the offset line 44 of the kneading bars is also negative, so that the transport of the product is considerably reduced in this embodiment.
  • two kneading bars 40 are provided in this sector 47.
  • a sector 47 is again provided between disk elements 25. However, this sector 47 is now arranged against the direction of rotation z in successive knee spaces 28, so that here there is a positive sector line 46 which has a positive influence on the product transport. The product is passed on from sector to sector, so to speak, when the shaft is rotated in the direction of rotation z.
  • the kneading bars are again only provided individually for each sector and are arranged on a negative offset line 44. This means that here the product is on the one hand exposed to positive transport in the sectors and on the other hand to negative transport through the arrangement of the kneading bars 40. It is understandable that this significantly improves and increases the axial mixing and kneading of the product.
  • both the sectors between two disk elements 25 and the kneading bars 40 are located on a positive offset or sector line 43/46. This enables very good evasive movements of the product in the transport direction x, so that the axial transport and at the same time the kneading of the products is influenced very positively.
  • the sectors are arranged on a negative sector line 45 in the direction of rotation, while the kneading bars 40 are located on a positive offset line 43.
  • the positive offset line 43 accelerates the transport of the product in the transport direction x, but in turn slows it down due to the negative arrangement of the sectors on the sector line 45. This also has a positive effect on a desired kneading or mixing effect.
  • a kneader shaft 20f in FIG. 8 two disk elements are omitted for each disk plane 42, specifically in the direction of rotation, i.e. with a negative sector line 45.
  • the kneading bars 40 are also arranged on negative offset lines 44.
  • the transport of the product in the transport direction x is inhibited twice, because there are always kneading bars or disc elements in the way of the product. Of course, this improves the kneading effect.
  • the free cross sections for the axial passage of vapors or gases are larger.
  • the sectors are arranged between the disk elements 25 on a positive sector line 46, while the kneading bars 40 are on a negative offset line 44.
  • the reduction in the number of kneading bars should also be mentioned here. While three kneading bars were arranged between two disk elements in the embodiment according to FIG. 8, there is only one kneading bar between two disk elements in the embodiment according to FIG. 9, whereby two kneading bars from three successive knee spaces are close to one disk element, while the third kneading bar is located is located in the third kneading chamber approximately exactly between the two remaining disc elements. Despite this reduction in the number of kneading elements, as in all examples, the requirement for extensive self-cleaning in interaction with the static kneading elements is met.
  • the exemplary embodiment of the kneader shaft 20h in FIG. 10 is the counterpart to the exemplary embodiment according to FIG. 8, both sectors and kneading bars being provided here on a positive offset line 43 or positive sector line 46. Again, there are three kneading bars between the individual disc elements.
  • a kneader shaft 20i is shown in FIG. 11, which represents the counterpart to the kneader shaft 20g in FIG.
  • the kneading bars 40 are located on a positive offset line 43 and the sectors between the disk elements 25 are located on a negative sector line 45.
  • the positive offset line 43 of the kneading bars improves the product transport, it is again due to the negative arrangement of the sectors on the negative sector line 45 inhibited.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Claims (11)

  1. Malaxeur fonctionnant en continu, pour le traitement thermique ou chimique de produits à l'état liquide, pâteux ou pulvérulent dans un carter (1), un arbre (20) de malaxeur s'étendant dans ce carter (1) de façon axiale et concentrique en étant garni d'éléments de disques (25) et de barres (40) du malaxeur et en tournant autour d'un axe de rotation (3), arbre qui provoque le transport du produit dans le sens du transport, et des éléments de contre-malaxage (33) étant prévus de façon fixe sur le carter (1) entre les éléments de disques, tandis qu'en outre les éléments de disques (25) sont disposés dans des plans de disques (42) perpendiculaires à l'arbre du malaxeur et constituent entre eux des secteurs libres (47) qui forment avec les plans de disques (42) d'éléments de disques (25) voisins, des chambres de malaxage (28), malaxeur caractérisé en ce que les barres (40) du malaxeur sont disposées sur une ligne de déport (43 ou 44) positive ou négative dans les chambres de malaxage comprises entre deux plans de disques (42), alors que, dans le cas d'une ligne de déport (43) "positive", chaque barre (40) du malaxeur associée respectivement à deux éléments de disques (25), est suivie, en sens inverse du sens de rotation (z), par une barre de malaxage associée aux deux éléments de disques suivants de la chambre de malaxage qui fait suite dans le sens du transport (x), tandis que la ligne de déport "négative" (44) s'étend dans le sens de rotation (z) et le sens de transport (x).
  2. Malaxeur selon la revendication 1, caractérisé en ce que les barres (40a) du malaxeur sont disposés dans les chambres de malaxage en précédant respectivement les éléments de disques (25).
  3. Malaxeur selon la revendication 1, caractérisé en ce que les barres (40b) du malaxeur sont disposées dans les chambres de malaxage en venant respectivement après les éléments de disques (25).
  4. Malaxeur selon l'une des revendications 1 à 3, caractérisé en ce que l'on prévoit, dans un plan de disques (42), trois éléments de disques (25).
  5. Malaxeur selon la revendication 4, caractérisé en ce que les éléments de disques (25) sont disposés à l'intérieur d'un plan de disques (42) avec un décalage angulaire de 120°.
  6. Malaxeur selon l'une des revendications 1 à 3, caractérisé en ce que, dans un plan de disques (42), on dispose au moins un élément de disque (25) de telle façon que les plus grands secteurs (47) restent libres.
  7. Malaxeur selon la revendication 6, caractérisé en ce que les secteurs les plus grands qui restent libres (47) se trouvent sur une ligne de secteurs positive ou négative(45 ou 46), alors que, dans le cas de la ligne de secteur (46) positive, les secteurs les plus grands (47) des chambres de malaxage les plus voisines se suivent en sens contraire du sens de rotation (z) et dans le sens de transport (x), tandis que la ligne de secteurs négative (45) s'étend dans le sens de rotation (z) et dans le sens de transport (x).
  8. Malaxeur selon la revendication 7, caractérisé en ce que, dans chaque chambre de malaxage, on associe à chaque élément de disque (25) une barre (40) du malaxeur.
  9. Malaxeur selon la revendication 8, caractérisé en ce qu'à l'intérieur des plus grands secteurs (47) se trouvent deux barres du malaxeur respectivement voisines(40) auxquelles se raccorde respectivement de façon axiale un élément de disque (25).
  10. Malaxeur selon la revendication 7, caractérisé en ce que, dans chaque chambre de malaxage (28), on ne prévoit qu'une seule barre (40) du malaxeur, l'une des barres (40) du malaxeur étant disposée entre deux éléments de disques voisins (25), tandis que la barre(40) du malaxeur qui la suit dans le sens de rotation (z), dans le sens du transport x ou dans le sens opposé, se trouve, vue radialement, plus près de l'élément de disque (25) qui suit dans le sens de rotation (z), dans le sens de transport (x) ou en sens inverse, et que la barre (40) du malaxeur qui suit cet élément dans le sens de rotation (z), dans le sens du transport (x) ou en sens inverse est, vue radialement, disposée à proximité d'un autre élément de disque.
  11. Malaxeur selon au moins l'une des revendications 1 à 10, caractérisé en ce que les dispositions des barres (40) du malaxeur et/ou des secteurs (47) le long de l'arbre de malaxeur (20), sont réalisées et/ou combinées différemment par zones de façon à comprendre respectivement une ou plusieurs sections.
EP91105497A 1990-04-11 1991-04-08 Pétrisseur-mélangeur travaillant en continu Expired - Lifetime EP0451747B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH124490A CH686406A5 (de) 1990-04-11 1990-04-11 Kontinuierlich arbeitender Mischkneter.
CH1244/90 1990-04-11

Publications (2)

Publication Number Publication Date
EP0451747A1 EP0451747A1 (fr) 1991-10-16
EP0451747B1 true EP0451747B1 (fr) 1995-08-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105497A Expired - Lifetime EP0451747B1 (fr) 1990-04-11 1991-04-08 Pétrisseur-mélangeur travaillant en continu

Country Status (8)

Country Link
US (1) US5147135A (fr)
EP (1) EP0451747B1 (fr)
JP (1) JP3225406B2 (fr)
AT (1) ATE126452T1 (fr)
CA (1) CA2040153C (fr)
CH (1) CH686406A5 (fr)
DE (1) DE59106245D1 (fr)
ES (1) ES2077704T3 (fr)

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DE102023106828A1 (de) 2023-03-19 2024-09-19 List Technology Ag Mischkneter

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CH583061A5 (fr) * 1972-10-18 1976-12-31 List Heinz
DE3538070A1 (de) * 1985-10-25 1987-04-30 Krauss Maffei Ag Misch- und knetvorrichtung
DE3635877C1 (de) * 1986-10-22 1987-10-15 Heinz Nienhaus Mischtrockner
CH672749A5 (fr) * 1986-12-19 1989-12-29 List Ag
CH674318A5 (fr) * 1987-08-28 1990-05-31 List Ag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9394626B2 (en) 2009-08-11 2016-07-19 List Holding Ag Method for treating a monomer, pre-polymer, polymer or a corresponding mixture
US9079984B2 (en) 2010-06-30 2015-07-14 List Holding Ag Process for thermal separation of a solution consisting of thermoplastic polymer and solvent
US9480933B2 (en) 2010-06-30 2016-11-01 List Holding Ag Process for thermal separation of a solution

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Publication number Publication date
US5147135A (en) 1992-09-15
JP3225406B2 (ja) 2001-11-05
CA2040153C (fr) 2001-01-02
CH686406A5 (de) 1996-03-29
DE59106245D1 (de) 1995-09-21
EP0451747A1 (fr) 1991-10-16
ES2077704T3 (es) 1995-12-01
JPH06262049A (ja) 1994-09-20
ATE126452T1 (de) 1995-09-15
CA2040153A1 (fr) 1991-10-12

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