DE102020207066A1 - Device for use in producing at least one strip from a rubber mixture and the use thereof - Google Patents

Abstract

The invention relates to a device for use in producing at least one strip from a rubber mixture, in particular for producing unvulcanized or vulcanized vehicle tire components, comprising an extruder head, a flow channel which is assigned to the extruder head and has a flow inlet end and a flow outlet end, and at least one channel wall device, wherein the one or the at least one channel wall device is attached to an inner wall of the flow channel of the extruder head or is designed as at least part of an inner wall of the flow channel of the extruder head, characterized in that the channel wall device is more compressible than the inner wall of the flow channel. The invention also relates to a use of the device.

Description

The invention relates to a device for use in producing at least one strip from a rubber mixture, in particular for producing unvulcanized or vulcanized vehicle tire components, comprising an extruder head, a flow channel which is assigned to the extruder head and has a flow inlet end and a flow outlet end, and at least one channel wall device, wherein the one or the at least one channel wall device is attached to an inner wall of the flow channel of the extruder head or is formed as at least part of an inner wall of the flow channel of the extruder head. The invention also relates to a use of the device.

In the case of extruder heads, the size and shape of the flow channel or channels in the extruder head is of paramount importance in order to guarantee adequate dimensional stability of the extrudate coming out of the extruder head. Different flow resistance differences and the resulting pressure differences in a rubber mixture pressed through the flow channels usually occur in the flow channels. These pressure differences are due to the geometry of the flow channel or the material properties of the rubber compounds. Different temperatures at different points in the flow channels can also be decisive. Since it is usually not possible to change the composition and thus the material properties of the rubber mixture, so-called flow deflectors are used in the prior art. This helps to reduce the material-dependent pressure variation in an extruder head when using a new rubber compound. Such a flow deflector is for example in EP 1475214 B1 disclosed (see. Claim 1).

In addition, disclosed DE 3521134 A1 an "extruder head for plastic materials, especially rubber mixtures for single or multi-component profiles with a flow channel into which flow dividers can be inserted, characterized in that at least one movable flow divider (6) is arranged in the flow channel (4)" (see claim 1).

The prior art documents described above are therefore concerned with reducing flow resistance differences in an extruder head. However, even with the use of the flow deflecting device described above and the flow divider described above, insufficient dimensional stability of the extrudate is still achieved.

One object on which the invention is based is to provide a device which enables the dimensional stability of an extrudate from an extruder head to be further improved.

• - einen Extruderkopf,
• - einen Strömungskanal, der dem Extruderkopf zugeordnet ist und ein Strömungs-
• Einlassende und ein Strömungs-Auslassende aufweist, und
• - mindestens eine Kanalwandungseinrichtung, wobei die eine oder die mindestens eine Kanalwandungseinrichtung an einer Innenwand des Strömungskanals des Extruderkopfes angebracht oder als zumindest ein Teil einer Innenwand des Strömungskanals des Extruderkopfes ausgebildet ist,

dadurch gekennzeichnet, dass
die Kanalwandungseinrichtung kompressibler ist als die Innenwand des Strömungskanals.This object is achieved according to the invention by a device for use for producing at least one strip from a rubber mixture, in particular for producing unvulcanized or vulcanized vehicle tire components

• - an extruder head,
• - a flow channel, which is assigned to the extruder head and a flow
• Having inlet end and a flow outlet end, and
• - At least one channel wall device, wherein the one or the at least one channel wall device is attached to an inner wall of the flow channel of the extruder head or is designed as at least part of an inner wall of the flow channel of the extruder head,

characterized in that
the duct wall device is more compressible than the inner wall of the flow duct.

It is a great achievement of the present invention to have found that the dimensional stability of an extrudate is considerably increased by reducing the periodic pressure fluctuations in the extruder head caused by the extruder screw by means of the compressible channel tensioning devices described above.

In the context of the present invention, the term “extruder head” includes, for example, in DE 3521134 A1 or other prior art documents. In particular, an extruder head describes the frame which is arranged around the flow channel of the extruder head and holds the flow channel in position. In addition, an extruder head known in the prior art has various closing mechanisms to prevent the rubber mixture from escaping outside the spray nozzle when it is extruded through the extruder head. The frame of the extruder head is preferably made of a material or a composite material as described below.

• - die Kompressibilität der Kanalwandungseinrichtung mittels des dynamischen Kompressionsmoduls gemäß DIN 52214 bei einer Resonanzfrequenz von 50 Hz und bei 20°C bestimmt wird und bevorzugt im Bereich von 0,0001 bis 150 GPa liegt, besonders bevorzugt im Bereich von 0,001 bis 80 GPa, ganz besonders bevorzugt im Bereich von 0,01 bis 25 GPa, insbesondere ganz besonders bevorzugt im Bereich von 0,1 bis 9 GPa, und/oder
• - die Kompressibilität der Innenwand des Strömungskanals mittels des dynamischen Kompressionsmoduls gemäß DIN 52214 bei einer Resonanzfrequenz von 50 Hz und bei 20°C bestimmt wird und bevorzugt im Bereich von 151 bis 1000 GPa liegt, besonders bevorzugt im Bereich von 170 bis 500 GPa, ganz besonders bevorzugt im Bereich von 200 bis 400 GPa

A device according to the invention is preferred as described above or as described above as preferred, wherein

• - the compressibility of the duct wall device by means of the dynamic compression module according to FIG DIN 52214 is determined at a resonance frequency of 50 Hz and at 20 ° C. and is preferably in the range from 0.0001 to 150 GPa, particularly preferably in the range from 0.001 to 80 GPa, very particularly preferably in the range from 0.01 to 25 GPa, in particular very particularly preferably in the range from 0.1 to 9 GPa, and / or
• - The compressibility of the inner wall of the flow channel by means of the dynamic compression module according to FIG DIN 52214 is determined at a resonance frequency of 50 Hz and at 20 ° C. and is preferably in the range from 151 to 1000 GPa, particularly preferably in the range from 170 to 500 GPa, very particularly preferably in the range from 200 to 400 GPa

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention.

• - die mehreren Materialien einen Materialverbund bilden und/oder
• - zumindest ein Material oder das eine Material eine Gummimischung ist, wobei die Gummimischung besonders bevorzugt hauptsächlich aus einem Kautschuk besteht ausgesucht aus der Gruppe bestehend aus NR, SBR, BR, SSBR, IR und IIR.

A device according to the invention is preferred as described above or as described above as preferred, wherein the duct wall device comprises a material or at least consists mainly of one or more materials, being preferred

• - The several materials form a material composite and / or
• - At least one material or the one material is a rubber mixture, the rubber mixture particularly preferably consisting mainly of a rubber selected from the group consisting of NR, SBR, BR, SSBR, IR and IIR.

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention.

• - der Elastizitätsmodul des Materials der Innenwand des Strömungskanals im Bereich von 151 bis 1000 GPa liegt, besonders bevorzugt im Bereich von 170 bis 500 GPa, ganz besonders bevorzugt im Bereich von 200 bis 400 GPa, und/oder
• - der Elastizitätsmodul des Materials oder des Materialverbundes der Kanalwandungseinrichtung im Bereich von 0,0001 bis 150 GPa liegt, besonders bevorzugt im Bereich von 0,001 bis 80 GPa, ganz besonders bevorzugt im Bereich von 0,01 bis 25 GPa, insbesondere ganz besonders bevorzugt im Bereich von 0,1 bis 9 GPa,

wobei die Ermittlung des Elastizitätsmoduls jeweils bei 20 °C gemäß DIN EN ISO 527-2 im Abschnitt „Kunststoffe: Bestimmung der Zugeigenschaften - Teil 2: Prüfbedingungen für Form- und Extrusionsmassen: für quasi-statische Versuche“ durchgeführt wirdA device according to the invention is preferred as described above or as described above as preferred, wherein

• the modulus of elasticity of the material of the inner wall of the flow channel is in the range from 151 to 1000 GPa, particularly preferably in the range from 170 to 500 GPa, very particularly preferably in the range from 200 to 400 GPa, and / or
• - The modulus of elasticity of the material or the composite material of the duct wall device is in the range from 0.0001 to 150 GPa, particularly preferably in the range from 0.001 to 80 GPa, very particularly preferably in the range from 0.01 to 25 GPa, especially very particularly preferably in the range from 0.1 to 9 GPa,

where the determination of the modulus of elasticity is in each case at 20 ° C according to DIN EN ISO 527-2 in the section "Plastics: Determination of tensile properties - Part 2: Test conditions for molding and extrusion compounds: for quasi-static tests" is carried out

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention.

A device according to the invention is preferred as described above or as described above as preferred, the duct wall device being detachably attached in the flow duct.

An advantage of the above-described aspect of the present invention is that, when the rubber mixture is changed, the flow resistances can easily be adapted due to the simple change of the duct wall device.

• - als zumindest ein Teil einer Innenwand des Strömungskanals des Extruderkopfes ausgebildet ist und eben abschließend mit der anliegenden Innenwand des Strömungskanals des Extruderkopfes eingebracht sind und
• - dazu eingerichtet sind, die Strömung einer Kautschukmischung im Strömungskanal nicht umzulenken

A device according to the invention is preferred as described above or as described above as preferred, with one or all of the at least one duct wall device

• - Is designed as at least a part of an inner wall of the flow channel of the extruder head and are introduced flush with the adjacent inner wall of the flow channel of the extruder head and
• - Are set up not to deflect the flow of a rubber mixture in the flow channel

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention.

A device according to the invention is preferred as described above or as described above as preferred, with one or all of the at least one channel wall devices being attached to an inner wall of the flow channel of the extruder head and in addition are set up to deflect the flow of a rubber mixture in the flow channel.

An advantage of the aspect of the present invention described above is that both the periodic pressure fluctuations due to the rotation of the extruder screw and material-dependent pressure fluctuations can be dampened by means of the device described above.

In the context of the present invention, the expression “deflect” relates to a change in the direction of flow which a rubber mixture pushed through the flow channel experiences exclusively due to a channel wall device which the rubber mixture would not have experienced without the channel wall device. This therefore means that the application of a duct wall device with a constant thickness / strength on the entire inner wall does not change the direction of flow within the scope of the present invention. In other words, within the scope of the present invention, this means that a channel wall device which is attached or set up in the flow channel and which is able to change the flow direction change of a rubber mixture has at least one surface which comes into contact with the rubber mixture during use and not parallel to Inner wall of the flow channel runs

A device according to the invention is preferred as described above or as described above as preferred, with one or more metal plates being attached to the surface facing the flow channel, one or more metal plates, the one or more metal plates preferably having a thickness in the range of 0, 01 mm to 50 mm, preferably in the range from 1 mm to 5 mm, and the one or more metal plates are particularly preferably attached to the surface of one or all of the at least one duct wall device that the one or more metal plates flush with the Inner wall of the flow channel of the extruder head and / or cover the entire surface of one or all of the at least one channel wall device directed towards the flow channel.

An advantage of the above-described aspect of the present invention is that no flow resistances arise due to edges on the channel wall devices or due to a different material of the channel wall devices compared to the inner wall of the flow channel.

A device according to the invention is preferred as described above or as described above as preferred, with one or all of the at least one channel wall device having recesses and / or air bubbles, the total volume of all recesses and / or all air bubbles per channel wall device preferably 1% to 90% of the total volume of the said duct wall device is particularly preferably 30% to 70% of the total volume, very particularly preferably 45% to 55% of the total volume, each measured at 20 ° C. and 1 bar ambient pressure.

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention. This is especially true if the pressures described below occur in the flow channel. The technical advantages described below in combination with the pressures described below also apply to the aspect of the present invention described above.

In the context of the present invention, air bubbles preferably mean specifically formed air pockets or cavities which are filled with a predefined amount of air. However, it can also be useful to fill such air pockets or cavities with nitrogen or carbon dioxide or mixtures thereof or other gases.

• - die Flüssigkeit zumindest hauptsächlich aus einem Material besteht ausgesucht aus der Gruppe bestehend aus Öl, wie Silikonöl, Glykole und Wasser und/oder
• - der Feststoff kompressibler ist als das Material oder der Materialverbund der Kanalwandungseinrichtung und/oder zumindest hauptsächlich aus einem Material besteht ausgesucht aus der Gruppe bestehend aus Silikon, einer Keramik und einer Gummimischung ist, wobei Matrixmaterial weniger kompressibel ist als Feststoff.

A device according to the invention is preferred as described above or as described above as preferred, the recesses being filled with a liquid and / or a solid, wherein

• - The liquid consists at least mainly of a material selected from the group consisting of oil, such as silicone oil, glycols and water and / or
• the solid is more compressible than the material or the composite material of the duct wall device and / or at least consists mainly of one material selected from the group consisting of silicone, a ceramic and a rubber mixture, with matrix material being less compressible than solid.

In the context of the present invention, the matrix material is one material or the material composite of a duct wall device as described above as being preferred.

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel are still dampen better than other device according to the invention. This is especially true if the pressures described below occur in the flow channel. The technical advantages described below in combination with the pressures described below also apply to the aspect of the present invention described above.

A device according to the invention is preferred as described above or as described above as preferred, each air bubble in one or all of the at least one duct wall device having a volume of 0.00001% to 5% of the total volume of said duct wall device, preferably a volume of 0.01 % to 1% of the total volume of said duct wall device, in each case measured at 20 ° C. and 1 bar ambient pressure.

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention. This is especially true if the pressures described below occur in the flow channel. The technical advantages described below in combination with the pressures described below also apply to the aspect of the present invention described above.

A device according to the invention is preferred as described above or as described above as preferred, with each recess in one or all of the at least one duct wall device having a volume of 10% to 60% of the total volume of said duct wall device, preferably a volume of 20% to 45% the total volume of the said duct wall device, measured in each case at 20 ° C. and 1 bar ambient pressure

An advantage of the aspect of the present invention described above is that the pressure fluctuations in the flow channel dampen even better than other devices according to the invention. This is especially true if the pressures described below occur in the flow channel. The technical advantages described below in combination with the pressures described below also apply to the aspect of the present invention described above.

• - mindestens eine Extruderschnecke, wobei die Extruderschnecke dazu vorgesehen ist, eine Kautschukmischung in den Strömungskanal des Extruderkopfes zu drücken, und/oder
• - eine Schneideeinheit umfasst, wobei die Schneideeinheit dazu vorgesehen ist, einen oder sämtliche der aus einer Kautschukmischung bestehenden und mittels der Vorrichtung hergestellten Streifen in unvulkanisierten Fahrzeugreifenbauteilen zu schneiden.

A device according to the invention is preferred as described above or as described above as preferred, the device additionally.

• - At least one extruder screw, the extruder screw being provided to press a rubber mixture into the flow channel of the extruder head, and / or
• - comprises a cutting unit, the cutting unit being provided to cut one or all of the strips in unvulcanized vehicle tire components, which are made of a rubber mixture and are produced by means of the device.

• - einen Extruderkopf,
• - einen Strömungskanal, der dem Extruderkopf zugeordnet ist und ein Strömungs-Einlassende und ein Strömungs-Auslassende aufweist, und
• - mindestens eine Kanalwandungseinrichtung, wobei die eine oder die mindestens eine Kanalwandungseinrichtung an einer Innenwand des Strömungskanals des Extruderkopfes angebracht oder als zumindest ein Teil einer Innenwand des Strömungskanals des Extruderkopfes ausgebildet ist,

dadurch gekennzeichnet, dass
die Kanalwandungseinrichtung kompressibler ist als die Innenwand des Strömungskanals,
wobei

• - die Kompressibilität der Kanalwandungseinrichtung mittels des dynamischen Kompressionsmoduls gemäß DIN 52214 bei einer Resonanzfrequenz von 50 Hz und bei 20°C bestimmt wird und bevorzugt im Bereich von 0,001 bis 80 GPa,
• - die Kompressibilität der Innenwand des Strömungskanals mittels des dynamischen Kompressionsmoduls gemäß DIN 52214 bei einer Resonanzfrequenz von 50 Hz und bei 20°C bestimmt wird und bevorzugt im Bereich von 170 bis 500 GPa,
• - die Kanalwandungseinrichtung zumindest hauptsächlich aus einem Material besteht, wobei das eine Material eine Gummimischung ist, wobei die Gummimischung hauptsächlich aus einem Kautschuk besteht ausgesucht aus der Gruppe bestehend aus NR, SBR, BR, SSBR, IR, IIR und deren Mischungen.
• - die Kanalwandungseinrichtung lösbar in dem Strömungskanal angebracht ist,
• - die Vorrichtung mindestens eine Extruderschnecke aufweist, wobei die Extruderschnecke dazu vorgesehen ist, eine Kautschukmischung in den Strömungskanal des Extruderkopfes zu drücken,
• - eine oder sämtliche der mindestens einen Kanalwandungseinrichtung dazu eingerichtet sind, die Strömung einer Kautschukmischung im Strömungskanal nicht umzulenken,
• - auf der zum Strömungskanal gerichteten Oberfläche einer oder sämtlicher der mindestens einen Kanalwandungseinrichtung eine oder mehrere Metallplatten angebracht sind, wobei die eine oder mehreren Metallplatten eine Stärke im Bereich von 0,01 mm bis 50 mm aufweisen, und die eine oder mehreren Metallplatten so auf der Oberfläche einer oder sämtlicher der mindestens einen Kanalwandungseinrichtung angebracht sind, dass die eine oder mehreren Metallplatten eben abschließend mit der Innenwand des Strömungskanals des Extruderkopfes sind und die gesamte, zum Strömungskanal gerichteten Oberfläche einer oder sämtlicher der mindestens einen Kanalwandungseinrichtung bedecken,
• - eine oder sämtliche der mindestens einen Kanalwandungseinrichtung Luftblasen aufweisen, wobei das Gesamtvolumen sämtlicher Luftblasen pro Kanalwandungseinrichtung 30 % bis 70 % des Gesamtvolumen der besagten Kanalwandungseinrichtung beträgt, gemessen bei 20 °C und 1 bar Umgebungsdruck, und
• - jede Luftblase in einer oder sämtlicher der mindestens einen Kanalwandungseinrichtung ein Volumen von 0,00001 % bis 5 % des Gesamtvolumen der besagten Kanalwandungseinrichtung beträgt, bevorzugt ein Volumen von 0,01 % bis 1 % des Gesamtvolumen der besagten Kanalwandungseinrichtung, jeweils gemessen bei 20 °C und 1 bar Umgebungsdruck.

A device according to the invention as described above, comprising:

• - an extruder head,
• a flow channel which is assigned to the extruder head and has a flow inlet end and a flow outlet end, and
• - At least one channel wall device, wherein the one or the at least one channel wall device is attached to an inner wall of the flow channel of the extruder head or is designed as at least part of an inner wall of the flow channel of the extruder head,

characterized in that
the duct wall device is more compressible than the inner wall of the flow duct,
whereby

• - The compressibility of the duct wall device by means of the dynamic compression module according to FIG DIN 52214 is determined at a resonance frequency of 50 Hz and at 20 ° C and preferably in the range from 0.001 to 80 GPa,
• - The compressibility of the inner wall of the flow channel by means of the dynamic compression module according to FIG DIN 52214 is determined at a resonance frequency of 50 Hz and at 20 ° C and preferably in the range from 170 to 500 GPa,
• the duct wall device consists at least mainly of one material, one material being a rubber mixture, the rubber mixture mainly consisting of a rubber selected from the group consisting of NR, SBR, BR, SSBR, IR, IIR and mixtures thereof.
• - the duct wall device is detachably attached in the flow duct,
• - The device has at least one extruder screw, the extruder screw being provided to press a rubber mixture into the flow channel of the extruder head,
• - one or all of the at least one duct wall devices are set up for this purpose, not to divert the flow of a rubber compound in the flow channel,
• - One or more metal plates are attached to the surface of one or all of the at least one channel wall device facing the flow channel, the one or more metal plates having a thickness in the range from 0.01 mm to 50 mm, and the one or more metal plates so on the Surface of one or all of the at least one channel wall device are attached so that the one or more metal plates are flush with the inner wall of the flow channel of the extruder head and cover the entire surface of one or all of the at least one channel wall device facing the flow channel,
• - one or all of the at least one duct wall device have air bubbles, the total volume of all air bubbles per duct wall device being 30% to 70% of the total volume of said duct wall device, measured at 20 ° C. and 1 bar ambient pressure, and
• - Each air bubble in one or all of the at least one duct wall device has a volume of 0.00001% to 5% of the total volume of said duct wall device, preferably a volume of 0.01% to 1% of the total volume of said duct wall device, each measured at 20 ° C and 1 bar ambient pressure.

The above-described advantageous aspects of a device according to the invention for use to produce at least one strip from a rubber mixture also apply to all aspects of a use described below and the advantageous aspects of uses according to the invention discussed below apply correspondingly to all aspects of a device according to the invention for use to produce at least one strip from a rubber mixture.

The invention also relates to a use for producing at least one strip from a rubber mixture, preferably for producing unvulcanized or vulcanized vehicle tire components, particularly preferably for producing unvulcanized or vulcanized treads or unvulcanized or vulcanized body components.

The extruder screw here preferably generates pressures in the flow channel in the range from 0.01 to 500 GPa, preferably in the range from 0.1 to 200 GPa, particularly preferably in the range from 1 to 100 GPa, very particularly preferably in the range from 1 to 25 GPa , in particular very particularly preferably in the range from 1 to 10 GPa.

One advantage of the above-described aspect of the present invention is that, in particular in the above-described pressure ranges, the pressure fluctuations within the rubber mixture in the flow channel can be particularly reduced. This is particularly true in combination with duct wall devices and inner walls which have the compressibilities described above or whose materials have the modulus of elasticity described above, since such duct wall devices and inner walls damp pressure fluctuations particularly well due to their natural vibrations at the pressures described above.

A method according to the invention is preferred as described above or as described above as preferred, the cutting unit cutting one or more of the strips consisting of a rubber mixture and produced by means of the device into one or more unvulcanized vehicle tire components and then optionally the one or more cut uncured uncured vehicle tire components are vulcanized in a vulcanization system to form one or more vehicle tire components in a vehicle tire.

Figure list

• 1: Perspektivische Ansicht auf eine schematisch dargestellte erfindungsgemäße Vorrichtung in einer ersten Ausführungsform;
• 2: Querschnittsaufsicht einer erfindungsgemäßen Vorrichtung in einer weiteren Ausführungsform, wobei drei Kanalwandungseinrichtungen jeweils als ein Teil der Innenwand des Strömungskanals des Extruderkopfes und mit der Innenwand eben abschließend ausgebildet sind;
• 3: Querschnittsaufsicht einer erfindungsgemäßen Vorrichtung in einer weiteren Ausführungsform, wobei zwei Kanalwandungseinrichtungen an der Innenwand des Strömungskanals des Extruderkopfes angebracht sind.

It shows:

• 1 : Perspective view of a schematically illustrated device according to the invention in a first embodiment;
• 2 : Cross-sectional view of a device according to the invention in a further embodiment, three channel wall devices each being designed as a part of the inner wall of the flow channel of the extruder head and flush with the inner wall;
• 3 : Cross-sectional view of a device according to the invention in a further embodiment, two channel wall devices being attached to the inner wall of the flow channel of the extruder head.

• - einen Extruderkopf 2, welcher offen dargestellt ist, um die Merkmale der Vorrichtung 1 in 1 besser zu erkennen,
• - einen Strömungskanal 3, der dem Extruderkopf 2 zugeordnet ist und ein Strömungs-Einlassende 4 und ein Strömungs-Auslassende 5 aufweist, und
• - drei Kanalwandungseinrichtung 6, wobei eine Kanalwandungseinrichtung 6a an der Innenwand 7 des Strömungskanals 3 des Extruderkopfes 2 angebracht ist oder und zwei Kanalwandungseinrichtung 6b als ein Teil der Innenwand 7 des Strömungskanals 3 des Extruderkopfes 2 ausgebildet sind,

dadurch gekennzeichnet, dass die Kanalwandungseinrichtungen 6 kompressibler sind als die Innenwand 7 des Strömungskanals 3. 1 shows a schematic representation of a device according to the invention 1 , wherein all of the channel wall devices 6 for damping the pressure fluctuations in the flow channel 3 releasable in the flow channel 3 are attached and a channel wall devices 6 is set up to control the flow of a rubber mixture in the Flow channel 3 redirect. In the 1 shown, inventive device 1 includes:

• - an extruder head 2 , which is shown openly to the features of the device 1 in 1 to see better
• - a flow channel 3 that the extruder head 2 is assigned and a flow inlet end 4th and a flow outlet end 5 has, and
• - three duct wall device 6, one duct wall device 6a on the inside wall 7th of the flow channel 3 of the extruder head 2 is attached or and two Kanalwandungseinrichtung 6b as part of the inner wall 7th of the flow channel 3 of the extruder head 2 are trained

characterized in that the duct wall devices 6 are more compressible than the inner wall 7th of the flow channel 3 .

2 shows a schematic representation of a device according to the invention 1 in a further embodiment, wherein all of the duct wall devices 6b as part of the inner wall 7th of the flow channel 3 of the extruder head 2 are designed and are set up, the pressure fluctuations in the flow channel 3 to dampen and flow of a rubber compound in the flow channel 3 not divert. As in 2 a metal plate is shown in each case 9 on the to the flow channel 3 directed surface 8th a duct wall device 6b attached, with the metal plates 9 have a thickness in the range of 1 mm to 5 mm, and the one or more metal plates 9 so on the surface 8th one or all of the at least one duct wall device 6b that are attached to the one or more metal plates 9 just to finish with the inner wall 7th of the flow channel 3 of the extruder head 2 and the entire surface facing the flow channel 8th of all duct wall devices 6b cover.

3 shows a schematic representation of a device according to the invention 1 in a particularly highly preferred embodiment, wherein two duct wall devices 6a on the inside wall 7th of the flow channel 3 of the extruder head 2 are attached and are set up, the pressure fluctuations in the flow channel 3 to dampen. As in 3 a metal plate is shown in each case 9 on the to the flow channel 3 directed surface of a channel wall device 6a attached, with the metal plates 9 have a thickness in the range of 1 mm to 5 mm, and the one or more metal plates 9 so on the surface of one or all of the at least one duct wall device 6a that are attached to the one or more metal plates 9 just to finish with the inner wall 7th of the flow channel 3 of the extruder head 2 and the entire surface of all duct wall devices facing the flow duct 6a cover. In addition, cover the duct wall devices 6a the entire inner wall of the flow channel of the extruder head.

List of reference symbols

1

Device for producing unvulcanized or vulcanized vehicle tire components

2

Extruder head

3

Flow channel

4th

Flow inlet end

5

Flow outlet end

6a

Kanalwandungseinrichtung, which on the inner wall 7th of the flow channel 3 of the extruder head 2 is appropriate

6b

Duct wall device, which as a part of the inner wall 7th of the flow channel 3 of the extruder head 2 are trained

7th

Inner wall of the flow channel

8th

the surface of a duct wall device directed towards the flow duct

9

Metal plate

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 1475214 B1 [0002]
• DE 3521134 A1 [0003, 0008]

Non-patent literature cited

• DIN 52214 [0009, 0035]
• DIN EN ISO 527-2 [0013]

Claims (15)

Device for use in producing at least one strip from a rubber mixture, in particular for producing unvulcanized or vulcanized vehicle tire components, comprising - an extruder head (2), - a flow channel (3) which is assigned to the extruder head (2) and a flow inlet end ( 4) and a flow outlet end (5), and - at least one channel wall device (6a, 6b), wherein the one or the at least one channel wall device (6a, 6b) on an inner wall (7) of the flow channel (3) of the extruder head ( 2) attached or designed as at least part of an inner wall (7) of the flow channel (3) of the extruder head (2), characterized in that the channel wall device (6a, 6b) is more compressible than the inner wall (7) of the flow channel (3) . Device according to Claim 1 - The compressibility of the duct wall device (6a, 6b) is determined by means of the dynamic compression module according to DIN 52214 at a resonance frequency of 50 Hz and at 20 ° C and is preferably in the range from 0.0001 to 150 GPa, particularly preferably in the range of 0.001 to 80 GPa, very particularly preferably in the range from 0.01 to 25 GPa, in particular very particularly preferably in the range from 0.1 to 9 GPa, and / or the compressibility of the inner wall (7) of the flow channel (3) by means of the dynamic compression modulus according to DIN 52214 is determined at a resonance frequency of 50 Hz and at 20 ° C and is preferably in the range from 151 to 1000 GPa, particularly preferably in the range from 170 to 500 GPa, very particularly preferably in the range from 200 to 400 GPa. Device according to one of the preceding claims, wherein the duct wall device (6a, 6b) comprises a material or at least consists mainly of one or more materials, with preference being given - The several materials form a material composite and / or At least one material or the one material is a rubber mixture, the rubber mixture particularly preferably consisting mainly of a rubber selected from the group consisting of NR, SBR, BR, SSBR, IR and IIR. Device according to one of the preceding claims, wherein - the modulus of elasticity of the material of the inner wall (7) of the flow channel (3) is in the range from 151 to 1000 GPa, particularly preferably in the range from 170 to 500 GPa, very particularly preferably in the range from 200 to 400 GPa, and or - The modulus of elasticity of the material or the composite material of the duct wall device (6a, 6b) is in the range from 0.0001 to 150 GPa, particularly preferably in the range from 0.001 to 80 GPa, very particularly preferably in the range from 0.01 to 25 GPa, in particular very particularly preferably in the range from 0.1 to 9 GPa, The determination of the modulus of elasticity is carried out at 20 ° C in accordance with DIN EN ISO 527-2 in the section "Plastics: Determination of tensile properties - Part 2: Test conditions for molding and extrusion compounds: for quasi-static tests". Device according to one of the preceding claims, wherein the one or the at least one channel wall device (6a, 6b) is detachably attached in the flow channel (3). Device according to one of the preceding claims, wherein one or all of the at least one duct wall device (6b) - Is designed as at least a part of an inner wall (7) of the flow channel (3) of the extruder head (2) and are introduced just to end with the adjacent inner wall (7) of the flow channel (3) of the extruder head (2) and - Are set up not to deflect the flow of a rubber mixture in the flow channel (3). Device according to one of the preceding claims, wherein one or all of the at least one channel wall device (6a) are attached to an inner wall (7) of the flow channel (3) of the extruder head (2) and are set up to prevent the flow of a rubber mixture in the flow channel (3). redirect. Device according to one of the preceding claims, wherein on the surface (8) directed towards the flow channel of one or all of the at least one channel wall device (6a, 6b) one or more metal plates (9) are attached, the one or more metal plates (9) preferably one Thickness in the range from 0.01 mm to 50 mm, preferably in the range from 1 mm to 5 mm, and the one or more metal plates (9) particularly preferably so on the surface (8) of one or all of the at least one duct wall device ( 6a, 6b) are attached so that the one or more metal plates (9) flush with the inner wall (7) of the flow channel (3) of the extruder head (2) and / or cover the entire surface (8) facing the flow channel of one or all of the at least one channel wall device (6a, 6b). Device according to one of the preceding claims, wherein one or all of the at least one channel wall device (6a, 6b) have recesses and / or air bubbles, the total volume of all recesses and / or all air bubbles per channel wall device (6a, 6b) preferably 1% to 90% of the total volume of said duct wall device (6a, 6b) is, particularly preferably 30% to 70% of the total volume, very particularly preferably 45% to 55% of the total volume, each measured at 20 ° C. and 1 bar ambient pressure. Device according to the preceding claim, wherein the recesses are filled with a liquid and / or a solid, wherein the liquid consists at least mainly of one material selected from the group consisting of oil, such as silicone oil, glycols and water and or - the solid is more compressible than the material or the composite material of the duct wall device (6a, 6b) and / or at least consists mainly of a material selected from the group consisting of silicone, a ceramic and a rubber mixture, with matrix material being less compressible than solid. Device according to one of the last two preceding Claims 9 and 10 wherein each air bubble in one or all of the at least one duct wall device (6a, 6b) has a volume of 0.00001% to 5% of the total volume of said duct wall device (6a, 6b), preferably a volume of 0.01% to 1% of the total volume of said duct wall device (6a, 6b), each measured at 20 ° C. and 1 bar ambient pressure. Device according to one of the last three preceding Claims 9 until 11th , each recess in one or all of the at least one channel wall device (6a, 6b) having a volume of 10% to 60% of the total volume of said channel wall device (6a, 6b), preferably a volume of 20% to 45% of the total volume of said channel wall device Duct wall device (6a, 6b), each measured at 20 ° C. and 1 bar ambient pressure. Device according to one of the preceding claims, wherein the device additionally - At least one extruder screw, the extruder screw being provided to press a rubber mixture into the flow channel of the extruder head, and or - comprises a cutting unit, the cutting unit being provided to cut one or all of the strips in unvulcanized vehicle tire components, consisting of a rubber mixture and produced by means of the device. Use of a device according to one of the preceding claims for producing at least one strip from a rubber mixture, preferably for producing unvulcanized or vulcanized vehicle tire components, particularly preferably for producing unvulcanized or vulcanized treads or unvulcanized or vulcanized body components. Use according to the preceding claim, wherein the cutting unit cuts one or more of the strips consisting of a rubber mixture and produced by means of the device (1) into one or more unvulcanized vehicle tire components and optionally the one or more cut unvulcanized vehicle tire components subsequently in a vulcanization system to one or more several vehicle tire components are vulcanized in a vehicle tire.

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