WO2023030584A1 - Device and method for producing a rubber finish mixture, in particular for vehicle tyres - Google Patents

Device and method for producing a rubber finish mixture, in particular for vehicle tyres Download PDF

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Publication number
WO2023030584A1
WO2023030584A1 PCT/DE2022/200163 DE2022200163W WO2023030584A1 WO 2023030584 A1 WO2023030584 A1 WO 2023030584A1 DE 2022200163 W DE2022200163 W DE 2022200163W WO 2023030584 A1 WO2023030584 A1 WO 2023030584A1
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WO
WIPO (PCT)
Prior art keywords
mixing
mixing device
mixture
rubber
ready
Prior art date
Application number
PCT/DE2022/200163
Other languages
German (de)
French (fr)
Inventor
Oliver Schramm
Original Assignee
Continental Reifen Deutschland 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
Application filed by Continental Reifen Deutschland Gmbh filed Critical Continental Reifen Deutschland Gmbh
Publication of WO2023030584A1 publication Critical patent/WO2023030584A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/484—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with two shafts provided with screws, e.g. one screw being shorter than the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7461—Combinations of dissimilar mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7466—Combinations of similar mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/748—Plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives

Definitions

  • the invention relates to a device for producing a ready-made rubber mixture, in particular for vehicle tires, according to the preamble of claim 1.
  • the invention also relates to a method for producing a ready-made rubber mixture, in particular for vehicle tires, according to the preamble of claim 9 and the use of the device described.
  • a rubber compound is generally produced in two mixing stages, namely by producing a rubber base compound and a rubber ready compound.
  • the production of the rubber base compound includes a mixing process in which the components such as rubber, fillers, processing agents, anti-aging agents, anti-ozonants and other common additives with the exception of vulcanization chemicals (sulphur, vulcanization accelerators, resins, etc.) are mixed together with the input of energy.
  • vulcanization chemicals sulphur, vulcanization accelerators, resins, etc.
  • the preparation of the ready mix includes a mixing process in which the remaining additives, such as the vulcanization components, are mixed in at the lowest possible temperatures.
  • the invention relates to the production of a ready-made rubber compound, this being produced in one process without the rubber base compound or an intermediate product being substantially cooled.
  • Rubber ready mixes can be produced, inter alia, in tandem mixers which comprise an upper machine and a lower machine arranged below the upper machine. Such tandem mixers are known, for example, from EP 0 618 055 A1 and WO 2017/097452 A1.
  • the ready-mixed rubber is usually produced in two stages Process steps: production of the rubber base mixture in at least one mixing process and production of the rubber ready-mix in a second mixing process.
  • the base rubber compound and the finished rubber compound can be produced in the tandem mixer in one step, with the base rubber compound being produced in the top mixer and the finished rubber compound being produced in the bottom mixer.
  • the disadvantage of the latter method is that the overall yield depends heavily on the necessary mixing and/or reaction time of the rubber base mixture.
  • the present invention comes in. It is the object of the present invention to provide an apparatus for preparing a rubber compound, in particular for vehicle tires, by which the efficiency is improved. Furthermore, the object of the invention is to provide a method for producing a ready-made rubber mixture, in particular for vehicle tires, by means of which the ready-made rubber mixture can be produced more efficiently.
  • the object is achieved by a device for producing a ready-mixed rubber compound having the features of claim 1. Furthermore, the object is achieved by a method having the features of claim 9 and the use of the device having the features of claim 12.
  • the object is achieved by a device for producing a ready-mixed rubber compound, in particular for the production of a vehicle tire
  • first and a second mixing device in particular a second discontinuous mixing device, which each comprise a mixing chamber and a mixing unit for mixing a material located in the mixing chamber, and
  • a transfer device by means of which the mixing chamber of the second mixing device can be charged directly with material from the mixing chamber of the first mixing device, and a third mixing device comprising a mixing chamber and a mixing unit, wherein the third mixing device can be charged with material from the mixing chamber of the second mixing device.
  • the yield is significantly improved by the device according to the invention.
  • the ready-made rubber mixture is produced in one mixing pass, with the mixture usually not being cooled during the mixing pass.
  • a mixing cycle has at least three steps, the first mixing step taking place in the first mixing device, the second mixing step taking place in the second mixing device and the third mixing step taking place in the third mixing device.
  • the three mixing devices can be arranged one behind the other or one above the other. It is essential that a mixing process takes place in at least all three mixing devices, which leads to a ready-mixed rubber mixture.
  • a ready-mixed rubber has at least vulcanization components.
  • the third mixing device is arranged downstream in a tandem mixer or a tandem mixer, in that the first mixing device is arranged above the second mixing device and the second mixing device is arranged above the third mixing device.
  • the mixing devices are fed into a mixer arranged one above the other with the aid of gravity.
  • the device is particularly suitable for the production of ready-made rubber mixtures comprising silica and/or at least one multi-stage rubber mixture.
  • a device comprising a third mixing device advantageously leads to an improved yield, since the mixing times in the three mixing devices are similarly long. This has been shown to be particularly the case with ready-mixed rubbers that contain silica or that contain multiple rubber compounding steps.
  • a multi-stage rubber mixture is, for example, a rubber mixture that comprises a material mixture from the first and/or the second and/or third mixing device and/or an after-treated rubber mixture.
  • the cycle time production batch/time unit
  • the transfer device within the meaning of the invention is designed in such a way that it can transfer material from the previous mixing device to the subsequent mixing device.
  • a transfer device can include a flap that lets material through when open.
  • the transfer devices are advantageously designed in such a way that the material does not cool down significantly.
  • the third mixing device preferably comprises a continuous mixer or a conical twin-screw mixing extruder or a two-roll plasticizer or a planetary roller extruder. It has been found to be advantageous that the continuous mixer from Farrel is particularly suitable. Furthermore, it has turned out to be advantageous that the two-roller plasticizer from UTH is particularly suitable. The use of one of the mixing units described advantageously leads to a significantly better efficiency and an improved yield in the production of rubber ready-mixes, in particular comprising silica or a multi-stage rubber mixture.
  • the third mixing device is preferably a continuous mixing device.
  • the yield of the finished rubber mixture is improved if the mixing process in the third mixing device takes place continuously. It is essential for this that the third mixing device comes continuously with material from the second mixing device (from a discontinuous to a continuous mixing process).
  • the device comprises a second transfer device, by means of which the third mixing device can be fed with material from the mixing chamber of the second mixing device or from a twin-screw extruder upstream of the third mixing device.
  • the second transfer device basically connects the second mixing device to the third mixing device or, alternatively, to the second mixing device an upstream twin-screw extruder, the twin-screw extruder being designed only to convey the material into a subsequent third mixing device.
  • Such an upstream twin-screw extruder differs from the third mixing device in that it does not mix, but only transports the material.
  • the second transfer device can be a flap, for example, through which material can be conveyed.
  • the device comprises at least one feed device with which material can be fed into the first and/or second and/or third mixing device and/or into the first and/or second transfer device.
  • the feed device can be a conveyor belt or a loading chute, for example.
  • the supply of additional materials is possible through the at least one supply device.
  • At least one rubber and at least one component selected from the group consisting of carbon black, silica, auxiliaries, silanes, oil and what the mastication auxiliaries are preferably fed into the first mixing device.
  • a material selected from the group consisting of a post-processed rubber material, carbon black and auxiliary chemicals is preferably fed into the second mixing device.
  • Vulcanizing agent and/or post-processed rubber mixtures are preferably fed into the third mixing device.
  • the aforementioned materials can also be fed into at least one of the transfer devices. It has advantageously been shown that a controlled supply of the material into the first and/or second mixing device in conjunction with the third mixing device, in particular with a continuous third mixing device, leads to a significantly improved yield.
  • the materials mentioned are particularly preferably fed into the third mixing device during the mixing process in the third mixing device. It is a significant advantage if the feeding takes place during the mixing process as it increases the efficiency and quality (distribution of the mixture) of the whole process.
  • the device preferably comprises at least one control unit for controlling the dwell time of the material and/or the temperature of the material in at least one of the mixing devices and/or at least one of the transfer devices and/or at least one of the feed devices.
  • the control unit is set up to control the process in such a way that a continuous mixing process can be made possible in the third mixing device. It is also important that the material does not cool down in between, so that the entire mixing process can run continuously.
  • the temperature in the third mixing device should not reach the vulcanization temperature.
  • the temperature in the third mixing device is particularly preferably in the range from 100-130.degree.
  • the device preferably comprises a weighing unit for determining the material weight and/or a volumetric dosing unit in at least one of the mixing devices and/or in at least one transfer device and/or in at least one of the feed devices.
  • the materials are weighed or volumetrically dosed outside of the mixing chamber. It is emptied into the mixing chamber or in the transfer device.
  • the material is weighed before and during feeding into one of the mixing devices. It is conceivable that the weighing unit or the volumetric and/or gravimetric dosing unit is connected to the control unit so that a time-controlled mixing process can take place. However, it is also conceivable for the materials to be prepared manually (gravimetrically and/or volumetrically) in a separate step.
  • the third mixing device preferably comprises a shaping unit at the outlet for finalizing the geometry of the finished rubber mixture.
  • a shaping unit can be a gear pump, for example.
  • the third mixing device has an infeed unit in the area of the inlet opening, particularly preferably at least one stuffer and/or at least one pair of gear wheels and/or at least one intermediate twin-screw extruder (TSRD), through which the material can also be introduced into the third mixing device .
  • TSRD intermediate twin-screw extruder
  • One such an infeed unit can, in addition, advantageously ensure a continuous mixing process.
  • the infeed unit can be connected to the control unit in order to control the infeed of the material into the third mixing unit. It is also conceivable that the import unit can also communicate with the weighing unit.
  • the device for producing a ready-made rubber mixture in particular for the production of a vehicle tire
  • first and a second mixing device each of which comprises a mixing chamber and a mixing unit for mixing a material located in the mixing chamber
  • twin-screw extruder through which the twin-screw extruder can be fed with material from the mixing chamber of the second mixing device
  • a third mixing device comprising a mixing chamber and a mixing unit, wherein the third mixing device can be loaded with material from the twin-screw extruder.
  • the material is conveyed from the twin-screw extruder into the third mixing device via a conveyor belt.
  • a device particularly preferably has a third transfer device, through which the third mixing device can be charged, in particular in a continuous mixing process.
  • the object of the invention is achieved by a method for producing a ready-made rubber mixture, in particular with a device described, comprising at least the following steps:
  • the material is selected from the group consisting of a post-processed rubber material, carbon black and auxiliary chemicals,
  • a significantly better yield can be achieved by the method according to the invention, in particular for ready-made rubber mixtures comprising silica and/or at least one multi-stage rubber mixture.
  • the multi-stage rubber compound can comprise, for example, the said first compound and/or second compound and/or ready-made rubber compound and/or a post-processed rubber compound.
  • a key benefit of adding post-processed rubber compounds is improved dispersion and/or compound viscosity, which improves processability and ultimately yield.
  • Auxiliaries can be, for example, plasticizers and/or additives and/or adhesion promoters and/or other customary auxiliaries.
  • Mastication aids can also be, for example, oxidizing agents and/or disulfides and/or thiophenols and/or others.
  • Auxiliary chemicals also include, for example, aging inhibitors and/or vulcanization accelerators and/or retarders.
  • the first two process steps are carried out batchwise and the third process step is carried out continuously.
  • the supply of material in the first mixing device and the second mixing device is controlled so that the third mixing device continuously Material can be loaded. This is advantageous in particular in the case of ready-made rubber mixtures comprising silica and/or at least one multi-stage rubber mixture, since the mixing times in the mixing devices are similarly long.
  • feed can/should be in metered amounts or volumes, thereby improving yield.
  • Gravimetric screw feeders or vibratory feeders, volumetric extruder gear feeders, etc. can be used as feed devices.
  • the second mixture is preferably introduced into the third mixing device via an introduction device, preferably via at least one stuffer and/or at least one pair of gear wheels and/or an interposed twin-screw extruder.
  • the introduction of material via the introduction device is particularly preferably controlled in such a way that the third mixing device can mix continuously.
  • the mixing of the third mixture to form the ready-made rubber mixture takes place in a continuous mixer or a conical twin-screw mixing extruder or a two-roll plasticizer or a planetary roller extruder.
  • the invention relates to the use of a device as described for the production of a rubber compound, wherein the rubber compound comprises silica or a treated rubber compound.
  • FIG 1 shows an embodiment of the device according to the invention
  • FIG. 2 shows a further embodiment of the device according to the invention.
  • FIG. 1 schematically shows an embodiment of the device 1 according to the invention with a first mixing device 2, a second mixing device 3 and a third mixing device 4, the three mixing devices 2, 3, 4 being arranged one above the other.
  • the device 1 also comprises a first transfer chute 5 and a second transfer chute 6 and a ram 7 through which material can be fed into the first mixing device 2 and a conveyor belt 8 through which material can be fed into the second mixing device 3 .
  • the third mixing device 4 comprises a third feed device 9, through which material can be fed into the third mixing device 4 in the mixing process.
  • At least one rubber mixture with at least one component selected from the group consisting of carbon black, silica, auxiliaries, silanes, oil and mastication auxiliaries is fed into the first mixing device 2 via the ram 7 .
  • the material is selected from the group consisting of a reworked rubber material, carbon black and auxiliary chemicals of the second Mixing device 3 supplied. Vulcanizing agents and/or post-processed rubber mixtures are fed into the third mixing device 4 via a third or more feed device/s 9 .
  • the device 1 comprises two stuffers 10 which introduce the material into the third mixing device 4 .
  • the stuffers 10 are designed in such a way that they push the material into the third mixing device 4 by means of a stuffing movement.
  • the mixing device 4 also has two rollers, by which the material at the end of the mixing device 4 is formed.
  • FIG. 2 schematically shows a further embodiment of the device 1 according to the invention with a first mixing device 2, a second mixing device 3, a twin-screw extruder 11 and a third mixing device 4.
  • the material to be mixed is pressed into the first mixing device 2 via a stamp 7.
  • the material mixture is then fed into the second mixing device 3 via the first transfer chute 5 .
  • Other materials can be added via the conveyor belt 8 .
  • the material mixture is fed through the second transfer shaft 6 into the twin-screw extruder 11 .
  • This transports the material mixture and guides it onto a second conveyor belt 12.
  • the material mixture is fed from the second conveyor belt 12 into the third mixing device 4 via a third transfer chute 13.
  • Two pushers 10 also convey the material into the third mixing device 4.
  • During the mixing process in further additives are fed in to the third mixing device 4 via the third feed device 9 .
  • These include, for example, vulcanization chemicals and/or auxiliary chemicals.
  • a ready-made rubber mixture is obtained.
  • the total mixing and reaction time of a silica-based masterbatch is approximately 360 seconds, divided between two mixers of approximately 200 seconds.
  • the mixing time for a ready-mixed rubber is approx. 150 seconds (continuous), with a batch being discharged every 200 seconds.
  • the first step in producing the rubber base compound is to incorporate rubber, carbon black and other additives.
  • the mixing time in the first mixer is approx. 150 seconds
  • a second step for producing a remill in the second mixer is approx. 120 seconds
  • the production of a ready-mixed rubber in a third mixer is approx. 150 seconds.
  • a batch is therefore ejected every 230 seconds.

Abstract

The invention relates to a device (1) for producing a rubber finish mixture, in particular for the production of vehicle tyres, having a first (2) and a second mixing device (3), wherein each mixing device comprises a mixing chamber and a mixing unit for mixing a material located in the mixing chamber, a transfer device, by means of which the mixing chamber of the second mixing device (3) is directly loadable with material from the mixing chamber of the first mixing device (2), and a third mixing device (4) comprising a mixing chamber and a mixing unit, wherein the third mixing device (4) is loadable with material from the mixing chamber of the second mixing device (3). Also disclosed is a related process for producing a finished rubber mixture.

Description

Beschreibung Description
Vorrichtung und Verfahren zur Herstellung einer Kautschukfertigmischung, insbesondere für Fahrzeugreifen Device and method for producing a ready-mixed rubber compound, in particular for vehicle tires
Die Erfindung betrifft eine Vorrichtung zur Herstellung einer Kautschukfertigmischung, insbesondere für Fahrzeugreifen, gemäß dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung ein Verfahren zur Herstellung einer Kautschukfertigmischung, insbesondere für Fahrzeugreifen, gemäß dem Oberbegriff des Anspruchs 9 und die Verwendung der beschriebenen Vorrichtung. The invention relates to a device for producing a ready-made rubber mixture, in particular for vehicle tires, according to the preamble of claim 1. The invention also relates to a method for producing a ready-made rubber mixture, in particular for vehicle tires, according to the preamble of claim 9 and the use of the device described.
Vorrichtungen und Verfahren zur Herstellung von Kautschukmischungen sind im Stand der Technik bekannt. Die Herstellung einer Kautschukmischung erfolgt in der Regel in zwei Mischstufen, nämlich durch die Herstellung einer Kautschukgrundmischung und einer Kautschukfertigmischung. Die Herstellung der Kautschukgrundmischung umfasst einen Mischprozess, in dem die Bestandteile wie Kautschuke, Füllstoffe, Verarbeitungsmittel, Alterungsschutzmittel, Ozonschutzmittel und weitere übliche Zusatzstoffe mit Ausnahme von Vulkanisationschemikalien (Schwefel, Vulkanisationsbeschleuniger, Harze, etc.) miteinander unter Energieeintrag vermischt werden. Im Anschluss wird die fertige Kautschukgrundmischung abgekühlt und eventuell gelagert. Die Herstellung der Fertigmischung umfasst einen Mischprozess, bei dem die restlichen Zusatzstoffe, wie beispielsweise die Vulkanisationsbestandteile, bei möglichst niedrigen Temperaturen eingemischt werden. Devices and methods for producing rubber mixtures are known in the prior art. A rubber compound is generally produced in two mixing stages, namely by producing a rubber base compound and a rubber ready compound. The production of the rubber base compound includes a mixing process in which the components such as rubber, fillers, processing agents, anti-aging agents, anti-ozonants and other common additives with the exception of vulcanization chemicals (sulphur, vulcanization accelerators, resins, etc.) are mixed together with the input of energy. The finished rubber base mixture is then cooled and possibly stored. The preparation of the ready mix includes a mixing process in which the remaining additives, such as the vulcanization components, are mixed in at the lowest possible temperatures.
Vorliegend betrifft die Erfindung die Herstellung einer Kautschukfertigmischung, wobei diese in einem Prozess hergestellt wird, ohne dass die Kautschukgrundmischung oder ein Zwischenprodukt wesentlich abgekühlt wird. Kautschukfertigmischungen können unter anderem in Tandem-Mischern hergestellt werden, die eine Obermaschine und eine unterhalb der Obermaschine angeordnete Untermaschine umfassen. Solche Tandem-Mischer sind beispielsweise aus der EP 0 618 055 A1 und der WO 2017/097452 A1 bekannt. Im Stand der Technik erfolgt die Herstellung der Kautschukfertigmischung üblicherweise in zwei Prozessschritten: Herstellung der Kautschukgrundmischung in mindestens einem Mischvorgang und die Herstellung der Kautschukfertigmischung in einem zweiten Mischvorgang. Des Weiteren können Kautschukgrund- und Kautschukfertigmischung im Tandem-Mischer in einem Schritt hergestellt werden, wobei die Kautschukgrundmischung im oberen Mischer und die Kautschukfertigmischung im unteren Mischer hergestellt wird. Nachteil des letztgenannten Verfahrens ist, dass die gesamte Ausbeute stark von der notwendigen Misch- und/oder Reaktionszeit der Kautschukgrundmischung abhängt. In the present case, the invention relates to the production of a ready-made rubber compound, this being produced in one process without the rubber base compound or an intermediate product being substantially cooled. Rubber ready mixes can be produced, inter alia, in tandem mixers which comprise an upper machine and a lower machine arranged below the upper machine. Such tandem mixers are known, for example, from EP 0 618 055 A1 and WO 2017/097452 A1. In the prior art, the ready-mixed rubber is usually produced in two stages Process steps: production of the rubber base mixture in at least one mixing process and production of the rubber ready-mix in a second mixing process. Furthermore, the base rubber compound and the finished rubber compound can be produced in the tandem mixer in one step, with the base rubber compound being produced in the top mixer and the finished rubber compound being produced in the bottom mixer. The disadvantage of the latter method is that the overall yield depends heavily on the necessary mixing and/or reaction time of the rubber base mixture.
Hier setzt die vorliegende Erfindung an. Es ist die Aufgabe der vorliegenden Erfindung eine Vorrichtung zur Herstellung einer Kautschukfertigmischung bereitzustellen, insbesondere für Fahrzeugreifen, durch die die Effizienz verbessert wird. Ferner ist es die Aufgabe der Erfindung ein Verfahren zur Herstellung einer Kautschukfertigmischung, insbesondere für Fahrzeugreifen, bereitzustellen, durch das die Kautschukfertigmischung effizienter herstellbar ist. This is where the present invention comes in. It is the object of the present invention to provide an apparatus for preparing a rubber compound, in particular for vehicle tires, by which the efficiency is improved. Furthermore, the object of the invention is to provide a method for producing a ready-made rubber mixture, in particular for vehicle tires, by means of which the ready-made rubber mixture can be produced more efficiently.
Die Aufgabe wird durch eine Vorrichtung zur Herstellung einer Kautschukfertigmischung mit den Merkmalen des Anspruchs 1 gelöst. Ferner wird die Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 9 gelöst sowie die Verwendung der Vorrichtung mit den Merkmalen des Anspruchs 12. The object is achieved by a device for producing a ready-mixed rubber compound having the features of claim 1. Furthermore, the object is achieved by a method having the features of claim 9 and the use of the device having the features of claim 12.
Die Aufgabe wird gelöst durch eine Vorrichtung zur Herstellung einer Kautschukfertigmischung, insbesondere für die Produktion eines Fahrzeugreifens, mit The object is achieved by a device for producing a ready-mixed rubber compound, in particular for the production of a vehicle tire
- einer ersten und einer zweiten Mischeinrichtung, insbesondere einer zweiten diskontinuierlichen Mischeinrichtung, welche jeweils eine Mischkammer und ein Mischaggregat zum Mischen eines sich in der Mischkammer befindenden Materials umfassen, und - a first and a second mixing device, in particular a second discontinuous mixing device, which each comprise a mixing chamber and a mixing unit for mixing a material located in the mixing chamber, and
- eine Übergabeeinrichtung, mittels welcher die Mischkammer der zweiten Mischeinrichtung direkt mit Material aus der Mischkammer der ersten Mischeinrichtung beschickbar ist, und einer dritten Mischeinrichtung umfassend eine Mischkammer und ein Mischaggregat, wobei die dritte Mischeinrichtung mit Material aus der Mischkammer der zweiten Mischeinrichtung beschikbar ist. - a transfer device, by means of which the mixing chamber of the second mixing device can be charged directly with material from the mixing chamber of the first mixing device, and a third mixing device comprising a mixing chamber and a mixing unit, wherein the third mixing device can be charged with material from the mixing chamber of the second mixing device.
Vorteilhafterweise wird die Ausbeute durch die erfindungsgemäße Vorrichtung erheblich verbessert. Durch die erfindungsgemäße Vorrichtung wird die Kautschukfertigmischung in einem Mischdurchgang hergestellt, wobei die Mischung üblicherweise während des Mischdurchgangs nicht abgekühlt wird. Advantageously, the yield is significantly improved by the device according to the invention. With the device according to the invention, the ready-made rubber mixture is produced in one mixing pass, with the mixture usually not being cooled during the mixing pass.
Im Sinne der Erfindung weist ein Mischdurchgang zumindest drei Schritte auf, wobei der ersten in der ersten Mischeinrichtung, der zweite Mischschritt in der zweiten Mischeinrichtung und der dritte Mischschritt in der dritten Mischeinrichtung erfolgt. Die drei Mischeinrichtungen können sowohl hintereinander als auch übereinander angeordnet sein. Wesentlich ist, dass in zumindest allen drei Mischeinrichtungen ein Mischprozess erfolgt, der zu einer Kautschukfertigmischung führt. Eine Kautschukfertigmischung weist erfindungsgemäß zumindest Vulkanisationsbestandteile auf. In einer bevorzugten Ausführungsform ist die dritte Mischeinrichtung in einem Tandemmischer beziehungsweise einem Tandemmischer nachgelagert angeordnet, indem die ersten Mischeinrichtung über der zweiten Mischeinrichtung und die zweite Mischeinrichtung über der dritten Mischeinrichtung angeordnet sind. Vorteilhafterweise erfolgt das Beschicken der Mischeinrichtungen in einen übereinander angeordneten Mischer mithilfe der Schwerkraft. According to the invention, a mixing cycle has at least three steps, the first mixing step taking place in the first mixing device, the second mixing step taking place in the second mixing device and the third mixing step taking place in the third mixing device. The three mixing devices can be arranged one behind the other or one above the other. It is essential that a mixing process takes place in at least all three mixing devices, which leads to a ready-mixed rubber mixture. According to the invention, a ready-mixed rubber has at least vulcanization components. In a preferred embodiment, the third mixing device is arranged downstream in a tandem mixer or a tandem mixer, in that the first mixing device is arranged above the second mixing device and the second mixing device is arranged above the third mixing device. Advantageously, the mixing devices are fed into a mixer arranged one above the other with the aid of gravity.
In einer weiteren bevorzugten Ausführungsform ist die Vorrichtung besonders zur Herstellung von Kautschukfertigmischungen umfassend Silika und/oder mindestens eine Mehrstufenkautschukmischung geeignet. Vorteilhafterweise führt eine solche Vorrichtung umfassend eine dritte Mischeinrichtung zu einer verbesserten Ausbeute, da die Mischzeiten in den drei Mischeinrichtungen ähnlich lang sind. Es hat sich gezeigt, dass dies insbesondere bei Kautschukfertigmischungen der Fall ist, die Silika oder die mehrere Kautschukmischungsschritte aufweisen. Eine Mehrstufenkautschukmischung ist beispielsweise eine Kautschukmischung, die eine Materialmischung aus der ersten und/oder der zweiten und/oder dritten Mischeinrichtung und/oder eine nachbehandelte Kautschukmischung umfasst. Vorteilhafterweise kann durch das Einmischen einer Mehrstufenkautschukmischung die Zykluszeit (Ausbringung Batch/Zeiteinheit) verkürzt werden, so dass die Ausbeute deutlich verbessert wird. In a further preferred embodiment, the device is particularly suitable for the production of ready-made rubber mixtures comprising silica and/or at least one multi-stage rubber mixture. Such a device comprising a third mixing device advantageously leads to an improved yield, since the mixing times in the three mixing devices are similarly long. This has been shown to be particularly the case with ready-mixed rubbers that contain silica or that contain multiple rubber compounding steps. A multi-stage rubber mixture is, for example, a rubber mixture that comprises a material mixture from the first and/or the second and/or third mixing device and/or an after-treated rubber mixture. Advantageously, the cycle time (production batch/time unit) can be shortened by mixing in a multi-stage rubber mixture, so that the yield is significantly improved.
Ferner ist die Übergabeeinrichtung im Sinne der Erfindung so ausgebildet, dass diese Material von der vorherigen Mischeinrichtung in die nachfolgende Mischeinrichtung überführen kann. Beispielsweise kann eine solche Übergabeeinrichtungen eine Klappe umfassen, die im geöffneten Zustand Material durchlässt. Vorteilhafterweise sind die Übergabeeinrichtungen so ausgebildet, dass das Material nicht wesentlich abkühlt. Furthermore, the transfer device within the meaning of the invention is designed in such a way that it can transfer material from the previous mixing device to the subsequent mixing device. For example, such a transfer device can include a flap that lets material through when open. The transfer devices are advantageously designed in such a way that the material does not cool down significantly.
Bevorzugt umfasst die dritte Mischeinrichtung einen Durchlaufmischer oder einen konischen Doppelschneckenmischextruder oder einen Zweiwalzen-Plastifizierer oder einen Planetwalzenextruder. Es hat sich vorteilhafterweise herausgestellt, dass der Durchlaufmischer der Firma Farrel besonders geeignet ist. Ferner hat sich vorteilhafterweise herausgestellt, dass der Zweiwalzen-Plastifizierer der Firma UTH besonders geeignet ist. Der Einsatz eines der beschriebenen Mischaggregate führt vorteilhafterweise zu einer erheblich besseren Effizienz und zu einer verbesserten Ausbeute bei der Herstellung von Kautschukfertigmischungen, insbesondere umfassend Silika oder einer Mehrstufenkautschukmischung. The third mixing device preferably comprises a continuous mixer or a conical twin-screw mixing extruder or a two-roll plasticizer or a planetary roller extruder. It has been found to be advantageous that the continuous mixer from Farrel is particularly suitable. Furthermore, it has turned out to be advantageous that the two-roller plasticizer from UTH is particularly suitable. The use of one of the mixing units described advantageously leads to a significantly better efficiency and an improved yield in the production of rubber ready-mixes, in particular comprising silica or a multi-stage rubber mixture.
Ferner bevorzugt ist die dritte Mischeinrichtung eine kontinuierliche Mischeinrichtung. Vorteilhafterweise konnte gezeigt werden, dass die Ausbeute der Kautschukfertigmischung verbessert wird, wenn der Mischprozess in der dritten Mischeinrichtung kontinuierlich erfolgt. Dazu ist wesentlich, dass die dritte Mischeinrichtung kontinuierlich mit Material aus der zweiten Mischeinrichtung stammt (vom diskontinuierlichen zu einem kontinuierlichen Mischprozess). Furthermore, the third mixing device is preferably a continuous mixing device. Advantageously, it was able to be shown that the yield of the finished rubber mixture is improved if the mixing process in the third mixing device takes place continuously. It is essential for this that the third mixing device comes continuously with material from the second mixing device (from a discontinuous to a continuous mixing process).
In einerweiteren bevorzugten Ausführungsform umfasst die Vorrichtung eine zweite Übergabeeinrichtung, mittels welcher die dritte Mischeinrichtung mit Material aus der Mischkammer der zweiten Mischeinrichtung oder aus einem vor der dritten Mischeinrichtung vorgelagerten Doppelschneckenextruder beschickbar ist. Die zweite Übergabeeinrichtungen verbindet grundsätzlich die zweite Mischeinrichtung mit der dritten Mischeinrichtung oder alternativ die zweite Mischeinrichtung mit einem vorgelagerten Doppelschneckenextruder, wobei der Doppelschneckenextruder lediglich dazu ausgebildet ist, das Material in eine anschließende dritte Mischeinrichtung zu fördern. Ein solcher vorgelagerte Doppelschneckenextruder unterscheidet sich von der dritten Mischeinrichtung dahingehend, dass dieser nicht mischt, sondern das Material lediglich transportiert. Die zweite Übergabeeinrichtungen kann beispielsweise eine Klappe sein, durch die Material hindurch förderbar ist. In a further preferred embodiment, the device comprises a second transfer device, by means of which the third mixing device can be fed with material from the mixing chamber of the second mixing device or from a twin-screw extruder upstream of the third mixing device. The second transfer device basically connects the second mixing device to the third mixing device or, alternatively, to the second mixing device an upstream twin-screw extruder, the twin-screw extruder being designed only to convey the material into a subsequent third mixing device. Such an upstream twin-screw extruder differs from the third mixing device in that it does not mix, but only transports the material. The second transfer device can be a flap, for example, through which material can be conveyed.
Weiter bevorzugt umfasst die Vorrichtung mindestens eine Zufuhreinrichtung, mit der Material in die erste und/oder zweite und/oder dritte Mischeinrichtung und/oder in die erste und/oder zweite Übergabeeinrichtung zuführbar ist. Die Zufuhreinrichtung kann beispielsweise ein Förderband oder ein Beladeschacht sein. Durch die mindestens eine Zufuhreinrichtung ist die Zufuhr von zusätzlichen Materialien möglich. In die erste Mischeinrichtung erfolgt bevorzugt die Zufuhr mindestens eines Kautschuks und mindestens einer Komponente ausgewählt aus der Gruppe bestehend aus Ruß, Silika, Hilfsmittel, Silane, Öl und was die Mastikationshilfsmittel. In die zweite Mischeinrichtung erfolgt bevorzugt die Zufuhr eines Materials ausgewählt aus der Gruppe bestehend aus einem nachbearbeitetem Kautschukmaterial, Ruß und Hilfschemikalien. In die dritte Mischeinrichtung erfolgt bevorzugt die Zufuhr von Vulkanisationsmittel und/oder nachbearbeiteten Kautschukmischungen. Die Zufuhr der zuvor genannten Materialien kann ebenfalls alternativ oder zusätzlich in mindestens eine der Übergabeeinrichtungen erfolgen. Es hat sich vorteilhafterweise gezeigt, dass eine kontrollierte Zufuhr des Materials in die erste und/oder zweite Mischeinrichtung in Zusammenhang mit der dritten Mischeinrichtung, insbesondere mit einer kontinuierlichen dritten Mischeinrichtung, zu einer deutlich verbesserten Ausbeute führt. More preferably, the device comprises at least one feed device with which material can be fed into the first and/or second and/or third mixing device and/or into the first and/or second transfer device. The feed device can be a conveyor belt or a loading chute, for example. The supply of additional materials is possible through the at least one supply device. At least one rubber and at least one component selected from the group consisting of carbon black, silica, auxiliaries, silanes, oil and what the mastication auxiliaries are preferably fed into the first mixing device. A material selected from the group consisting of a post-processed rubber material, carbon black and auxiliary chemicals is preferably fed into the second mixing device. Vulcanizing agent and/or post-processed rubber mixtures are preferably fed into the third mixing device. Alternatively or additionally, the aforementioned materials can also be fed into at least one of the transfer devices. It has advantageously been shown that a controlled supply of the material into the first and/or second mixing device in conjunction with the third mixing device, in particular with a continuous third mixing device, leads to a significantly improved yield.
Besonders bevorzugt erfolgt die Zufuhr der genannten Materialien in die dritte Mischeinrichtung während des Mischvorgangs in der dritten Mischeinrichtung. Es ist ein wesentlicher Vorteil, wenn die Zufuhr während des Mischvorgangs erfolgt, da so die Effizienz und Qualität (Verteilung der Mischung) des gesamten Prozesses gesteigert wird. Weiterhin bevorzugt umfasst die Vorrichtung mindestens eine Steuereinheit zur Steuerung der Verweilzeit des Materials und/oder der Temperatur des Materials in mindestens einer der Mischeinrichtungen und/oder mindestens einer der Übergabeeinrichtungen und/oder mindestens einer der Zufuhreinrichtungen. Die Steuereinheit ist dazu eingerichtet, den Prozess dahingehend zu steuern, dass ein kontinuierlicher Mischprozess in der dritten Mischeinrichtung ermöglicht werden kann. Wesentlich ist außerdem, dass das Material zwischendurch nicht abgekühlt, damit der gesamte Mischvorgangs kontinuierlich ablaufen kann. Insbesondere sollte die Temperatur in der dritten Mischeinrichtung nicht die Vulkanisationstemperatur erreichen. Besonders bevorzugt ist die Temperatur in der dritten Mischeinrichtung im Bereich von 100-130 °C. The materials mentioned are particularly preferably fed into the third mixing device during the mixing process in the third mixing device. It is a significant advantage if the feeding takes place during the mixing process as it increases the efficiency and quality (distribution of the mixture) of the whole process. Furthermore, the device preferably comprises at least one control unit for controlling the dwell time of the material and/or the temperature of the material in at least one of the mixing devices and/or at least one of the transfer devices and/or at least one of the feed devices. The control unit is set up to control the process in such a way that a continuous mixing process can be made possible in the third mixing device. It is also important that the material does not cool down in between, so that the entire mixing process can run continuously. In particular, the temperature in the third mixing device should not reach the vulcanization temperature. The temperature in the third mixing device is particularly preferably in the range from 100-130.degree.
Ferner bevorzugt umfasst die Vorrichtung eine Wiegeeinheit zur Bestimmung des Materialgewichts und/oder einer volumetrische Dosiereinheit in mindestens einer der Mischeinrichtungen und/oder in mindestens einer Übergabeeinrichtungen und/oder in mindestens einer der Zufuhreinrichtungen. Dabei erfolgt die Verwiegung bzw. das volumetrische Dosieren der Materialien außerhalb der Mischkammer. Die Entleerung erfolgt in die Mischkammer oder in der Übergabeeinrichtung Vorteilhafterweise wird das Material vor und während des Zuführens in eine der Mischeinrichtungen abgewogen werden. Denkbar ist, dass die Wiegeeinheit oder die volumetrische und/oder gravimetrische Dosiereinheit mit der Steuereinheit verbunden ist, so dass ein zeitlich gesteuerter Mischvorgang erfolgen kann. Denkbar ist aber auch, dass das Vorbereiten der Materialien manuell (gravimetrisch und/oder volumetrisch) in einem separaten Schritt erfolgt. Furthermore, the device preferably comprises a weighing unit for determining the material weight and/or a volumetric dosing unit in at least one of the mixing devices and/or in at least one transfer device and/or in at least one of the feed devices. The materials are weighed or volumetrically dosed outside of the mixing chamber. It is emptied into the mixing chamber or in the transfer device. Advantageously, the material is weighed before and during feeding into one of the mixing devices. It is conceivable that the weighing unit or the volumetric and/or gravimetric dosing unit is connected to the control unit so that a time-controlled mixing process can take place. However, it is also conceivable for the materials to be prepared manually (gravimetrically and/or volumetrically) in a separate step.
Weiterhin bevorzugt umfasst die dritte Mischeinrichtung am Ausgang eine Formeinheit zu Finalisierung der Geometrie der Kautschukfertigmischung. Eine solche Formeinheit kann beispielsweise eine Zahnradpumpe sein. Furthermore, the third mixing device preferably comprises a shaping unit at the outlet for finalizing the geometry of the finished rubber mixture. Such a molding unit can be a gear pump, for example.
In einer weiteren bevorzugten Ausführungsform weist die dritte Mischeinrichtung im Bereich der Eintrittsöffnung eine Einfuhreinheit auf, besonders bevorzugt mindestens einen Stopfer und/oder mindestens ein Zahnradpaar und/oder mindestens einen zwischengeschalteten Doppelschneckenextruder (TSRD), durch welche das Material zusätzlich in die dritte Mischeinrichtung einführbar ist. Eine solche Einfuhreinheit kann zusätzlich vorteilhafterweise einen kontinuierlichen Mischvorgang gewährleisten. Dazu kann die Einfuhreinheit mit der Steuerungseinheit verbunden sein, um die Einfuhr des Materials in die dritte Mischeinheit zu steuern. Denkbar ist ebenfalls, dass die Einfuhreinheit zusätzlich mit der Wiegeeinheit kommunizieren kann. In a further preferred embodiment, the third mixing device has an infeed unit in the area of the inlet opening, particularly preferably at least one stuffer and/or at least one pair of gear wheels and/or at least one intermediate twin-screw extruder (TSRD), through which the material can also be introduced into the third mixing device . One such an infeed unit can, in addition, advantageously ensure a continuous mixing process. For this purpose, the infeed unit can be connected to the control unit in order to control the infeed of the material into the third mixing unit. It is also conceivable that the import unit can also communicate with the weighing unit.
In einer weiteren bevorzugten Ausführungsform umfasst die Vorrichtung zur Herstellung einer Kautschukfertigmischung, insbesondere für die Produktion eines Fahrzeugreifens, In a further preferred embodiment, the device for producing a ready-made rubber mixture, in particular for the production of a vehicle tire,
- eine erste und eine zweite Mischeinrichtung, welche jeweils eine Mischkammer und ein Mischaggregat zum Mischen eines sich in der Mischkammer befindenden Materials umfasst, - a first and a second mixing device, each of which comprises a mixing chamber and a mixing unit for mixing a material located in the mixing chamber,
- eine erste Übergabeeinrichtung, mittels welcher die Mischkammer der zweiten Mischeinrichtung direkt mit Material aus der Mischkammer der ersten Mischeinrichtung beschickbar ist, - a first transfer device, by means of which the mixing chamber of the second mixing device can be fed directly with material from the mixing chamber of the first mixing device,
- eine zweite Übergabeeinrichtung und einen Doppelschneckenextruder, durch den der Doppelschneckenextruder mit Material aus der Mischkammer der zweiten Mischeinrichtung beschickbar ist, - a second transfer device and a twin-screw extruder, through which the twin-screw extruder can be fed with material from the mixing chamber of the second mixing device,
- und eine dritte Mischeinrichtung umfassend eine Mischkammer und ein Mischaggregat, wobei die dritte Mischeinrichtung mit Material aus dem Doppelschneckenextruder beschikbar ist. - and a third mixing device comprising a mixing chamber and a mixing unit, wherein the third mixing device can be loaded with material from the twin-screw extruder.
Denkbar ist, dass in einer solchen Ausführungsform das Material vom Doppelschneckenextruder über ein Förderband in die dritte Mischeinrichtung gefördert wird. Besonders bevorzugt weist eine solche Vorrichtung eine dritte Übergabeeinrichtungen auf, durch welche die dritte Mischeinrichtung beschickbar ist, insbesondere in einem kontinuierlichen Mischprozess. It is conceivable that in such an embodiment the material is conveyed from the twin-screw extruder into the third mixing device via a conveyor belt. Such a device particularly preferably has a third transfer device, through which the third mixing device can be charged, in particular in a continuous mixing process.
Weiterhin wird die Aufgabe der Erfindung durch ein Verfahren zur Herstellung einer Kautschukfertigmischung gelöst, insbesondere mit einer beschriebenen Vorrichtung, umfassend zumindest die folgenden Schritte: Furthermore, the object of the invention is achieved by a method for producing a ready-made rubber mixture, in particular with a device described, comprising at least the following steps:
- Mischen einer Kautschukmischung mit mindestens einer Komponente ausgewählt aus der Gruppe bestehend aus Ruß, Silika, Hilfsmittel, Silane, öl und Mastikationshilfsmittel in einer ersten Mischeinrichtung zu einer ersten Mischung, - Mixing a rubber mixture with at least one component selected from the group consisting of carbon black, silica, auxiliaries, silanes, oil and mastication aids in a first mixing device to form a first mixture,
- Überführen der ersten Mischung in eine zweite Mischeinrichtung, - transferring the first mixture into a second mixing device,
- Zuführen von mindestens einem Material zur ersten Mischung in die zweite Mischeinrichtung, wobei das Material ausgewählt ist aus der Gruppe bestehend aus einem nachbearbeitetem Kautschukmaterial, Ruß und Hilfschemikalien,- feeding at least one material for the first mixture into the second mixing device, wherein the material is selected from the group consisting of a post-processed rubber material, carbon black and auxiliary chemicals,
- Mischen der Mischung in der zweiten Mischeinrichtung zu einer zweiten Mischung, - mixing the mixture in the second mixing device to form a second mixture,
- Überführen der zweiten Mischung in eine dritte Mischeinrichtung und - transferring the second mixture into a third mixing device and
- Mischen der Mischung in der dritten Mischeinrichtung zu einer Kautschukfertigmischung, wobei insbesondere kontinuierlich nachgearbeitetes Kautschukmaterial, Vulkanisationsmittel und/oder Hilfsmittel zugesetzt werden. - Mixing the mixture in the third mixing device to form a ready-made rubber mixture, in particular continuously reworked rubber material, vulcanizing agents and/or auxiliaries being added.
Vorteilhafterweise kann durch das erfindungsgemäße Verfahren eine wesentlich bessere Ausbeute erzielt werden, insbesondere für Kautschukfertigmischungen umfassend Silika und/oder zumindest eine Mehrstufenkautschukmischung. Die Mehrstufenkautschukmischung kann beispielsweise die genannte erste Mischung und/oder zweite Mischung und/oder Kautschukfertigmischung und/oder eine nachbearbeitete Kautschukmischung umfassen. Ein wesentlicher Vorteil bei der Zugabe von nachbearbeiteten Kautschukmischungen ist eine verbesserte Dispersion und/oder Viskosität der Mischung, wodurch sich die Verarbeitbarkeit und letztendlich die Ausbeute verbessert. Advantageously, a significantly better yield can be achieved by the method according to the invention, in particular for ready-made rubber mixtures comprising silica and/or at least one multi-stage rubber mixture. The multi-stage rubber compound can comprise, for example, the said first compound and/or second compound and/or ready-made rubber compound and/or a post-processed rubber compound. A key benefit of adding post-processed rubber compounds is improved dispersion and/or compound viscosity, which improves processability and ultimately yield.
Hilfsmittel können beispielsweise Weichmacher und/oder Additive und/oder Haftvermittler und/oder andere übliche Hilfsmittel sein. Mastikationshilfsmittel können ferner beispielsweise Oxidationsmittel und/oder Disulfide und/oder Thiophenole und/oder andere sein. Ferner umfassen Hilfschemikalien beispielsweise Alterungsschutzmittel und/oder Vulkanisationsbeschleuniger und/oder -verzögerer. Auxiliaries can be, for example, plasticizers and/or additives and/or adhesion promoters and/or other customary auxiliaries. Mastication aids can also be, for example, oxidizing agents and/or disulfides and/or thiophenols and/or others. Auxiliary chemicals also include, for example, aging inhibitors and/or vulcanization accelerators and/or retarders.
In einer bevorzugten Ausführungsform erfolgen die ersten beiden Verfahrensschritte diskontinuierlich und der dritte Verfahrensschritt kontinuierlich. Dabei wird die Zufuhr von Material in die erste Mischeinrichtung und die zweite Mischeinrichtung so gesteuert, dass die dritte Mischeinrichtung kontinuierlich mit Material beschickt werden kann. Insbesondere bei Kautschukfertigmischungen umfassend Silika und/oder zumindest eine Mehrstufenkautschukmischung ist dies von Vorteil, da die Mischzeiten in den Mischeinrichtungen ähnlich lange sind. In a preferred embodiment, the first two process steps are carried out batchwise and the third process step is carried out continuously. The supply of material in the first mixing device and the second mixing device is controlled so that the third mixing device continuously Material can be loaded. This is advantageous in particular in the case of ready-made rubber mixtures comprising silica and/or at least one multi-stage rubber mixture, since the mixing times in the mixing devices are similarly long.
Bevorzugt wird Material, das über mindestens eine Zufuhreinrichtung direkt der dritten Mischung in die dritte Mischeinrichtung zugeführt wird, insbesondere Vulkanisationsmittel und/oder nachbearbeite Kautschukmischungen. Wesentlich ist, dass das Material während des Mischvorgangs zugeführt wird. Ein wesentlicher Vorteil ist, dass die Zufuhr in dosierten Mengen oder Volumen erfolgen kann/sollte, wodurch die Ausbeute verbessert wird. Als Zufuhreinrichtungen können gravimetrische Schnecken- oder Vibrationsdosierer, volumetrisch arbeitende Extruder-Zahnraddosierer etc. dienen. Preference is given to material that is fed directly to the third mixture in the third mixing device via at least one feed device, in particular vulcanizing agents and/or post-processed rubber mixtures. It is essential that the material is added during the mixing process. A key benefit is that feed can/should be in metered amounts or volumes, thereby improving yield. Gravimetric screw feeders or vibratory feeders, volumetric extruder gear feeders, etc. can be used as feed devices.
Weiterhin bevorzugt wird die zweite Mischung über eine Einfuhreinrichtung in die dritte Mischeinrichtung eingeführt, bevorzugt über mindestens einen Stopfer und/oder mindestens ein Zahnradpaar und/oder einen zwischengeschalteten Doppelschneckenextruder. Das Einführen von Material über die Einfuhreinrichtung wird besonders bevorzugt so gesteuert, dass die dritte Mischeinrichtung kontinuierlich mischen kann. Furthermore, the second mixture is preferably introduced into the third mixing device via an introduction device, preferably via at least one stuffer and/or at least one pair of gear wheels and/or an interposed twin-screw extruder. The introduction of material via the introduction device is particularly preferably controlled in such a way that the third mixing device can mix continuously.
Ferner bevorzugt erfolgt das Mischen der dritten Mischung zu der Kautschukfertigmischung in einem Durchlaufmischer oder einem konischen Doppelschneckenmischextruder oder einem Zweiwalzen-Plastifizierer oder einem Planetwalzenextruder. Further preferably, the mixing of the third mixture to form the ready-made rubber mixture takes place in a continuous mixer or a conical twin-screw mixing extruder or a two-roll plasticizer or a planetary roller extruder.
Außerdem betrifft die Erfindung die Verwendung einer beschriebenen Vorrichtung zur Herstellung einer Kautschukfertigmischung, wobei die Kautschukfertigmischung Silika oder eine behandelte Kautschukmischung umfasst. In addition, the invention relates to the use of a device as described for the production of a rubber compound, wherein the rubber compound comprises silica or a treated rubber compound.
Weitere Vorteile und Merkmale der erfindungsgemäßen Vorrichtung sowie des Verfahrens ergeben sich aus den Unteransprüchen, die sich auf vorteilhafte Ausgestaltungen der vorliegenden Erfindung beziehen und als solche nicht einschränkend zu verstehen sind. Von der Erfindung mit umfasst sind auch Kombinationen der Merkmale verschiedener Unteransprüche, soweit diese technisch möglich sind, auch wenn sich die Unteransprüche nicht aufeinander beziehen oder wenn diese verschiedenen Anspruchskategorien zugehören. Ferner sind auch Kombinationen von bevorzugten und besonders bevorzugten Ausführungsformen untereinander miteinander kombinierbar, soweit diese technisch möglich sind. Dies gilt auch für die einzelnen Merkmale der nachfolgend diskutierten Ausführungsbeispiele, soweit diese nicht für den Fachmann als zwingend zueinander gehörig erkennbar sind. Further advantages and features of the device according to the invention and of the method result from the dependent claims, which relate to advantageous configurations of the present invention and as such are not to be understood as limiting. The invention also includes combinations of the features of various subclaims, insofar as these are technically possible, even if the subclaims do not relate to each other or if they belong to different categories of claims. Furthermore, combinations of preferred and particularly preferred embodiments can also be combined with one another, insofar as these are technically possible. This also applies to the individual features of the exemplary embodiments discussed below, insofar as these are not recognizable to the person skilled in the art as necessarily belonging to one another.
Figurenbeschreibung character description
Weitere Einzelheiten und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung der Ausführungsführungsbeispiele in Verbindung mit den Zeichnungen. In dieser zeigen Further details and advantages of the present invention result from the following description of the exemplary embodiments in conjunction with the drawings. in this show
Figur 1 eine Ausführungsform der erfindungsgemäßen Vorrichtung und Figure 1 shows an embodiment of the device according to the invention and
Figur 2 eine weitere Ausführungsform der erfindungsgemäßen Vorrichtung. FIG. 2 shows a further embodiment of the device according to the invention.
Figur 1 zeigt schematisch eine Ausführungsform der erfindungsgemäßen Vorrichtung 1 mit einer ersten Mischeinrichtung 2, einer zweiten Mischeinrichtung 3 und einer dritten Mischeinrichtung 4, wobei die drei Mischeinrichtungen 2, 3, 4 übereinander angeordnet sind. Die Vorrichtung 1 umfasst außerdem einen ersten Übergabeschacht 5 und einen zweiten Übergabeschacht 6 sowie einen Stempel 7, durch den Material in die erste Mischeinrichtung 2 zuführbar ist und ein Förderband 8, durch welches Material in die zweite Mischeinrichtung 3 zuführbar ist. Die dritte Mischeinrichtung 4 umfasst eine dritte Zufuhreinrichtung 9, durch die Material in den Mischvorgang in die dritten Mischeinrichtung 4 zuführbar ist. Über den Stempel 7 werden mindestens eine Kautschukmischung mit mindestens einer Komponente ausgewählt aus der Gruppe bestehend aus Ruß, Silika, Hilfsmittel, Silane, Öl und Mastikationshilfsmittel in die erste Mischeinrichtung 2 zugeführt. Über das Förderband 8 wird das Material ausgewählt aus der Gruppe bestehend aus einem nachbearbeitetem Kautschukmaterial, Ruß und Hilfschemikalien der zweiten Mischeinrichtung 3 zugeführt. Über eine dritte oder mehrere Zufuhreinrichtung/en 9 werden Vulkanisationsmittel und/oder nachbearbeite Kautschukmischungen in die dritte Mischeinrichtung 4 zugeführt. Außerdem umfasst die Vorrichtung 1 zwei Stopfer 10, die das Material in die dritte Mischeinrichtung 4 einführen. Die Stopfer 10 sind so ausgebildet, dass diese das Material durch eine Stopfbewegung in die dritte Mischeinrichtung 4 nachschieben. Die Mischeinrichtung 4 weist ferner zwei Walzen auf, durch die das Material am Ende der Mischeinrichtung 4 geformt wird. FIG. 1 schematically shows an embodiment of the device 1 according to the invention with a first mixing device 2, a second mixing device 3 and a third mixing device 4, the three mixing devices 2, 3, 4 being arranged one above the other. The device 1 also comprises a first transfer chute 5 and a second transfer chute 6 and a ram 7 through which material can be fed into the first mixing device 2 and a conveyor belt 8 through which material can be fed into the second mixing device 3 . The third mixing device 4 comprises a third feed device 9, through which material can be fed into the third mixing device 4 in the mixing process. At least one rubber mixture with at least one component selected from the group consisting of carbon black, silica, auxiliaries, silanes, oil and mastication auxiliaries is fed into the first mixing device 2 via the ram 7 . Via the conveyor belt 8, the material is selected from the group consisting of a reworked rubber material, carbon black and auxiliary chemicals of the second Mixing device 3 supplied. Vulcanizing agents and/or post-processed rubber mixtures are fed into the third mixing device 4 via a third or more feed device/s 9 . In addition, the device 1 comprises two stuffers 10 which introduce the material into the third mixing device 4 . The stuffers 10 are designed in such a way that they push the material into the third mixing device 4 by means of a stuffing movement. The mixing device 4 also has two rollers, by which the material at the end of the mixing device 4 is formed.
Figur 2 zeigt schematisch eine weitere Ausführungsform der erfindungsgemäßen Vorrichtung 1 mit einer ersten Mischeinrichtung 2, einer zweiten Mischeinrichtung 3, einem Doppelschneckenextruder 11 und einer dritten Mischeinrichtung 4. Über einen Stempel 7 wird das zu mischende Material in die erste Mischeinrichtung 2 gepresst. Im Anschluss wird die Materialmischung über den ersten Übergabeschacht 5 in die zweite Mischeinrichtung 3 geführt. Über das Förderband 8 können weitere Materialien zugesetzt werden. Im Anschluss der zweiten Mischeinrichtung 3 wird die Materialmischung durch den zweiten Übergabeschacht 6 in den Doppelschneckenextruder 11 geführt. Dieser transportiert die Materialmischung und führt diese auf ein zweites Förderband 12. Vom zweiten Förderband 12 erfolgt die Einspeisung der Materialmischung in die dritte Mischeinrichtung 4 über einen dritten Übergabeschacht 13. Zwei Stopfer 10 fördern das Material zusätzlich in die dritte Mischeinrichtung 4. Während des Mischvorgangs in der dritten Mischeinrichtung 4 werden weitere Zusätze über die dritte Zufuhreinrichtung 9 eingespeist. Dazu zählen beispielsweise Vulkanisationschemikalien und/oder Hilfschemikalien. Am Ende der dritten Mischeinrichtung 4 wird eine Kautschukfertigmischung erhalten. FIG. 2 schematically shows a further embodiment of the device 1 according to the invention with a first mixing device 2, a second mixing device 3, a twin-screw extruder 11 and a third mixing device 4. The material to be mixed is pressed into the first mixing device 2 via a stamp 7. The material mixture is then fed into the second mixing device 3 via the first transfer chute 5 . Other materials can be added via the conveyor belt 8 . Following the second mixing device 3 , the material mixture is fed through the second transfer shaft 6 into the twin-screw extruder 11 . This transports the material mixture and guides it onto a second conveyor belt 12. The material mixture is fed from the second conveyor belt 12 into the third mixing device 4 via a third transfer chute 13. Two pushers 10 also convey the material into the third mixing device 4. During the mixing process in further additives are fed in to the third mixing device 4 via the third feed device 9 . These include, for example, vulcanization chemicals and/or auxiliary chemicals. At the end of the third mixing device 4, a ready-made rubber mixture is obtained.
Beispiele für eine Gesamtmisch- und Reaktionszeit einer auf Silika basierten Grundmischung: Examples of a total mixing and reaction time for a silica-based masterbatch:
Beispiel 1 : Example 1 :
Die Gesamtmisch- und Reaktionszeit einer auf Silika basierten Grundmischung beträgt ca. 360 Sekunden, die aufgeteilt ist auf zwei Mischer mit ca. 200 Sekunden. Die Mischzeit einer Kautschukfertigmischung beträgt ca. 150 Sekunden (kontinuierlich), wobei der Ausstoß für ein Batch somit alle 200 Sekunden erfolgt. Beispiel 2: The total mixing and reaction time of a silica-based masterbatch is approximately 360 seconds, divided between two mixers of approximately 200 seconds. The mixing time for a ready-mixed rubber is approx. 150 seconds (continuous), with a batch being discharged every 200 seconds. Example 2:
In einem ersten Schritt zur Herstellung der Kautschukgrundmischung erfolgt die Einarbeitung von Kautschuk, Russ und anderen Zusätzen. Im ersten Mischer beträgt die Mischzeit ca. 150 Sekunden, einem zweiten Schritt zur Herstellung eines Remills im zweiten Mischer ca. 120 Sekunden und die Herstellung einer Kautschukfertigmischung in einem dritten Mischer ca. 150 Sekunden. Der Ausstoß eines Batch erfolgt somit alle 230 Sekunden. The first step in producing the rubber base compound is to incorporate rubber, carbon black and other additives. The mixing time in the first mixer is approx. 150 seconds, a second step for producing a remill in the second mixer is approx. 120 seconds and the production of a ready-mixed rubber in a third mixer is approx. 150 seconds. A batch is therefore ejected every 230 seconds.
Bezugszeichenliste: Reference list:
1 Vorrichtung 1 device
2 erste Mischeinrichtung 2 first mixing device
3 zweite Mischeinrichtung3 second mixing device
4 dritte Mischeinrichtung 4 third mixing device
5 erste Übergabeschacht5 first transfer shaft
6 zweite Übergabeschacht6 second transfer shaft
7 Stempel 7 stamps
8 erste Förderband 8 first conveyor belt
9 dritte Zufuhreinrichtung9 third feeder
10 zwei Stopfer 10 two pushers
11 Doppelschneckenextruder11 twin screw extruders
12 zweites Förderband 12 second conveyor
13 dritte Übergabeschacht 13 third transfer shaft

Claims

Patentansprüche Vorrichtung (1 ) zur Herstellung einer Kautschukfertigmischung, insbesondere für die Produktion eines Fahrzeugreifens, mit Claims Device (1) for producing a ready-made rubber mixture, in particular for the production of a vehicle tire
- einer ersten und einer zweiten Mischeinrichtung (2, 3), welche jeweils eine Mischkammer und ein Mischaggregat zum Mischen eines sich in der Mischkammer befindenden Materials umfassen, und - a first and a second mixing device (2, 3), which each comprise a mixing chamber and a mixing unit for mixing a material located in the mixing chamber, and
- eine Übergabeeinrichtung, mittels welcher die Mischkammer der zweiten Mischeinrichtung (3) direkt mit Material aus der Mischkammer der ersten Mischeinrichtung (2) beschickbar ist, gekennzeichnet durch eine dritte Mischeinrichtung (4) umfassend eine Mischkammer und ein Mischaggregat, wobei die dritte Mischeinrichtung (4) mit Material aus der Mischkammer der zweiten Mischeinrichtung (3) beschikbar ist. Vorrichtung (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass die dritte Mischeinrichtung (4) einen Durchlaufmischer oder einen konischen Doppelschneckenmischextruder oder einen Zweiwalzen-Plastifizierer oder einen Planetwalzenextruder umfasst. Vorrichtung (1 ) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die dritte Mischeinrichtung (4) eine kontinuierliche Mischeinrichtung ist. Vorrichtung (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung (1) eine zweite Übergabeeinrichtung (6) umfasst, mittels welcher die dritte Mischeinrichtung (4) mit Material aus der Mischkammer der zweiten Mischeinrichtung (3) oder aus einem vor der dritten Mischeinrichtung (4) vorgelagerten Doppelschneckenextruder (11) beschickbar ist. Vorrichtung (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung (1) mindestens eine Zufuhreinrichtung (9) umfasst, mit der Material in die erste und/oder zweite und/oder dritte Mischeinrichtung (2, 3, 4) und/oder in die erste und/oder zweite Übergabeeinrichtung (6) zuführbar ist. - a transfer device, by means of which the mixing chamber of the second mixing device (3) can be charged directly with material from the mixing chamber of the first mixing device (2), characterized by a third mixing device (4) comprising a mixing chamber and a mixing unit, the third mixing device (4 ) can be loaded with material from the mixing chamber of the second mixing device (3). Device (1) according to claim 1, characterized in that the third mixing device (4) comprises a continuous mixer or a conical twin-screw mixing extruder or a two-roller plasticizer or a planetary roller extruder. Device (1) according to claim 1 or 2, characterized in that the third mixing device (4) is a continuous mixing device. Device (1) according to any one of the preceding claims, characterized in that the device (1) comprises a second transfer device (6), by means of which the third mixing device (4) with material from the mixing chamber of the second mixing device (3) or from a front the third mixing device (4) upstream of the twin-screw extruder (11) can be charged. Device (1) according to any one of the preceding claims, characterized in that the device (1) comprises at least one feed device (9), with the material in the first and / or second and / or third mixing device (2, 3, 4) and /or in the first and/or second transfer device (6) can be supplied.
6. Vorrichtung (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung (1) mindestens eine Steuereinheit zur Steuerung der Verweilzeit des Materials und/oder der Temperatur des Materials in mindestens einer der Mischeinrichtungen (2, 3, 4) und/oder mindestens einer der Übergabeeinrichtungen (5, 6, 13) und/oder mindestens einer der Zufuhreinrichtungen (9) umfasst. 6. Device (1) according to one of the preceding claims, characterized in that the device (1) has at least one control unit for controlling the residence time of the material and/or the temperature of the material in at least one of the mixing devices (2, 3, 4) and /or at least one of the transfer devices (5, 6, 13) and/or at least one of the feed devices (9).
7. Vorrichtung (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung eine Wiegeeinheit zur Bestimmung des Materialgewichts und/oder einer volumetrische Dosiereinheit in mindestens einer der Mischeinrichtungen (2, 3, 4) und/oder in mindestens einer Übergabeeinrichtungen (5, 6, 13) und/oder in mindestens einer der Zufuhreinrichtungen (9) umfasst. 7. Device (1) according to one of the preceding claims, characterized in that the device has a weighing unit for determining the material weight and/or a volumetric dosing unit in at least one of the mixing devices (2, 3, 4) and/or in at least one transfer device ( 5, 6, 13) and/or in at least one of the feed devices (9).
8. Vorrichtung (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die dritte Mischeinrichtung (4) im Bereich der Eintrittsöffnung eine Einfuhreinheit aufweist, insbesondere mindestens einen Stopfer (10) und/oder mindestens ein Zahnradpaar und/oder mindestens ein zwischengeschalteten TSRD, durch welche das Material zusätzlich in die dritte Mischeinrichtung (4) einführbar ist. 8. The device (1) according to any one of the preceding claims, characterized in that the third mixing device (4) has an infeed unit in the area of the inlet opening, in particular at least one stuffer (10) and/or at least one pair of gear wheels and/or at least one interposed TSRD , through which the material can also be introduced into the third mixing device (4).
9. Verfahren zur Herstellung einer Kautschukfertigmischung, insbesondere mit einer Vorrichtung (1 ) nach einem der vorherigen Ansprüche, umfassend zumindest die folgenden Schritte: 9. A method for producing a rubber ready-mix, in particular with a device (1) according to one of the preceding claims, comprising at least the following steps:
- Mischen einer Kautschukmischung mit mindestens einer Komponente ausgewählt aus der Gruppe bestehend aus Ruß, Silika, Hilfsmittel, Silane, Öl und Mastikationshilfsmittel in einer ersten Mischeinrichtung (2) zu einer ersten Mischung, - Mixing a rubber mixture with at least one component selected from the group consisting of carbon black, silica, auxiliaries, silanes, oil and mastication auxiliaries in a first mixing device (2) to form a first mixture,
- Überführen der ersten Mischung in eine zweite Mischeinrichtung (3),- transferring the first mixture into a second mixing device (3),
- Zuführen von mindestens einem Material zur ersten Mischung in die zweite Mischeinrichtung (3), wobei das Material ausgewählt ist aus der Gruppe bestehend aus einem nachbearbeitetem Kautschukmaterial, Ruß und Hilfschemikalien, - Supplying at least one material to the first mixture in the second mixing device (3), wherein the material is selected from the A group consisting of a reworked rubber material, carbon black and ancillary chemicals,
- Mischen der zweiten Mischung in der zweiten Mischeinrichtung (3),- mixing the second mixture in the second mixing device (3),
- Überführen der zweiten Mischung in eine dritte Mischeinrichtung (4) und- transferring the second mixture into a third mixing device (4) and
- Mischen der dritten Mischung in der dritten Mischeinrichtung (4) zu einer Kautschukfertigmischung. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass über mindestens eine Zufuhreinrichtung (9) Material direkt der dritten Mischung in die dritte Mischeinrichtung (4) zugeführt wird, insbesondere Vulkanisationsmittel und/oder nachbearbeite Kautschukmischungen. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Mischen der dritten Mischung zu der Kautschukfertigmischung in einem Durchlaufmischer oder einem konischen Doppelschneckenmischextruder (11) oder einem Zweiwalzen-Plastifizierer oder einem Planetwalzenextruder erfolgt. Verwendung einer Vorrichtung nach einem der Ansprüche 1 bis 8 zur Herstellung einer Kautschukfertigmischung, wobei die Kautschukfertigmischung Silika oder eine behandelte Kautschukmischung umfasst. - Mixing the third mixture in the third mixing device (4) to form a ready-made rubber mixture. Method according to Claim 9, characterized in that material, in particular vulcanizing agent and/or post-processed rubber mixtures, is fed directly to the third mixture in the third mixing device (4) via at least one feed device (9). Method according to one of the preceding claims, characterized in that the mixing of the third mixture to form the ready-mixed rubber takes place in a continuous mixer or a conical twin-screw mixing extruder (11) or a two-roll plasticizer or a planetary roller extruder. Use of an apparatus according to any one of claims 1 to 8 for preparing a rubber compound, wherein the rubber compound comprises silica or a treated rubber compound.
16 16
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