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NL2006420C2 - Method of manufacturing an antistatic vehicle tire and vehicle tire obtainable by the method. - Google Patents

Method of manufacturing an antistatic vehicle tire and vehicle tire obtainable by the method. Download PDF

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Publication number
NL2006420C2
NL2006420C2 NL2006420A NL2006420A NL2006420C2 NL 2006420 C2 NL2006420 C2 NL 2006420C2 NL 2006420 A NL2006420 A NL 2006420A NL 2006420 A NL2006420 A NL 2006420A NL 2006420 C2 NL2006420 C2 NL 2006420C2
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NL
Netherlands
Prior art keywords
tread
conductive rubber
conductive
tire
chimney
Prior art date
Application number
NL2006420A
Other languages
Dutch (nl)
Inventor
Cristian Bernard Maria Greve
Martijn Johannes Maria Haar
Original Assignee
Apollo Vredestein Bv
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 Apollo Vredestein Bv filed Critical Apollo Vredestein Bv
Priority to NL2006420A priority Critical patent/NL2006420C2/en
Application granted granted Critical
Publication of NL2006420C2 publication Critical patent/NL2006420C2/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/08—Electric-charge-dissipating arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D2030/526—Unvulcanised treads, e.g. on used tyres; Retreading the tread comprising means for discharging the electrostatic charge, e.g. conductive elements or portions having conductivity higher than the tread rubber

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Description

Method of manufacturing an antistatic vehicle tire and vehicle tire obtainable by the method
The present invention relates to a method of manufacturing an antistatic vehicle tire, 5 and to a device for manufacturing such a tire. The invention further relates to an antistatic tire, obtainable by the method.
Traditionally, carbon black has been used in tires to make them conductive and therefore antistatic. Carbon black however may cause hysteresis losses that compromise 10 tire properties such as rolling resistance. To improve fuel economy of automobiles attempts have been made to decrease the rolling resistance of a tire. One major solution has been to use tread rubber formulations having silica as a reinforcing material at the expense of carbon black. Although tread rubbers comprising silica provide increased braking ability on wet roads and decreased rolling resistance, they are generally poorly 15 conducting, which may lead to undesired accumulation of electrical charges on an automobile body. With poorly conducting is meant a specific electrical resistance of higher than 108 Q.cm3 after vulcanization.
Antistatic vehicle tires have been proposed that comprise a poorly conducting tread 20 layer and a conductive tread base layer arranged underneath the tread layer, whereby the ground contacting surface is electrically connected to the conductive tread base layer or other conductive layers by providing an electrical connection between the two. EP 0718127 B1 for instance discloses a vehicle tire, wherein the tread base layer comprises chimneys that extend radially outward to the tire ground contacting surface to make the 25 electrical connection.
Although some improvements in antistatic behavior are obtained in the known tire, this generally goes at the expense of other tire properties, such as rolling resistance and durability. The conductive chimneys created between the ground contacting surface of 30 the tread layer and the tire conductive base layer divide the tread layer in a number of mutually separated sections. This construction may weaken the tires and their durability is compromised, for instance because the conductive chimneys of the base layer in between the tread sections tend to separate therefrom in use.
The present invention aims to provide a method of manufacturing an antistatic vehicle tire having improved antistatic properties and durability in comparison with the known antistatic tire, and to provide a device for manufacturing such a tire.
2 5 The present invention thereto provides a method of manufacturing a vehicle tire, the tread portion of which comprises a poorly conducting tread layer that provides a ground contacting surface disposed in a radially outward part of the tread portion, and a, optionally conductive, tread base layer arranged underneath the tread layer, the method comprising co-extruding the tread layer and tread base layer, providing the co-extrusion 10 with a conductive rubber member and driving at least a part of the conductive rubber member into the formed co-extrusion to form a conductive rubber chimney that at least extends between the ground contacting surface and the optionally conductive base layer. The method according to the invention produces a vehicle tire with a tread portion comprising at least one conductive rubber chimney, somewhere in the circumferential 15 direction of the tire. The chimney thus obtained between at least the ground contacting surface and the optionally conductive tread base layer provides enough conductivity for the tire to become antistatic to a desirable extent. It has moreover been established that one such connection per revolution of the tire may be enough to discharge any static electricity. In an embodiment wherein the tread base layer is not or insufficiently 20 conductive, at least a part of the conductive rubber member is driven into the formed co-extrusion far enough to form a conductive rubber chimney that extends between the ground contacting surface and beyond the base layer to contact a conductive sub layer of the tire, such as the steel cord compound layer that is positioned below the base tread layer.
25
In a preferred method according to the invention, the conductive mbber member is provided by coating the co-extrusion (i.e. the co-extruded tread and tread base layers) with a conductive rubber compound or, preferably a conductive rubber solution. A conductive rubber compound preferably comprises a mbber polymer and an amount of 30 carbon black that is blended with the mbber polymer in a preferred range of from 30 to 100 parts by weight per 100 parts by weight of the mbber polymer, more preferably from 40 to 80 parts by weight, even more preferably from 50 to 70 parts by weight. In addition to carbon black, the conductive mbber compound may comprise other fillers, such as silica for instance, and/or processing aids. The conductive mbber compound 3 and/or the optionally conductive tread base layer compound preferably have a specific resistance of at most 106 Ω.αη3 after vulcanization, preferably at most 105 Ω.αη3 after vulcanization, and most preferably at most 104 Ω.αη3 after vulcanization.
5 The conductive rubber solution or cement preferably comprises a conductive rubber compound as described above dissolved in a suitable solvent. Preferred solvents comprise organic solvents, of which hexane, heptane, petroleum ether, tetrahydrofuran and cyclohexane (benzene) are particularly preferred.
10 In the present embodiment, the conductive rubber member is formed by a coating process, known per se, such as those using lick rolls, brushes, spraying, and others. The conductive rubber compound (solution) is applied to a predetermined portion on the top and/or bottom surface of the co-extrusion, and the resulting conductive rubber layer dried and vulcanization-cured to obtain the conductive rubber member.
15
In another preferred embodiment of the method of the invention, the conductive rubber member is provided by co-extruding it together with the tread layer and the tread base layer. A preferred embodiment according to the invention further provides a method wherein the conductive rubber member extends in the circumferential direction of the 20 tire and in the radial direction of the tire from the ground contacting surface to above the conductive base layer. Electrical contact is then made with the conductive base (or other) layer of the tire by providing the conductive rubber chimney(s) after coextrusion.
25 Another preferred method according to the invention is characterized in that the conductive rubber chimney extends from the conductive rubber member to, into or beyond the optionally conductive base layer. In the latter embodiment, electrical conductivity is achieved through the belt layer for instance, or through other underlying conductive parts of the tire.
30
In still another preferred embodiment of the method according to the invention, the conductive rubber chimney is formed by pushing a tool into the formed co-extrusion, whereby part of the conductive rubber member of the co-extrusion is entrained to form the chimney. In a preferred method, the tool comprises a needle and a needle-shaped 4 conductive rubber chimney is formed. Although a needle-shaped electrical connection (of small dimensions) is hereby provided between the ground contacting surface and the optionally conductive tread base layer, such a minor connection apparently and surprisingly provides enough conductivity for the tire to become antistatic to a desirable 5 extent. A needle-shaped chimney of conductive rubber further barely disrupts the integrity of the tread layer due to its small size and therefore barely affects the tire’s durability. The needle-shaped conductive rubber chimney(s) are preferably disposed in such a manner that at least some of them are within a ground contacting surface of the tread portion.
10
With needle-shaped is understood any elongated body with a length dimension substantially larger than the cross-dimension, for instance at least 10 times as large. Needle-shaped is understood to encompass rods, columns with circular or polygonic cross-section, pyramids, hourglass shapes, without being limited to this enumeration.
15
According to the present embodiment, the needle-shaped conductive path(s) created between the ground contacting surface of the tire and a conducting base layer of the tire have a relatively small size, in particular in the circumferential and/or width direction of the tire. A preferred embodiment of a vehicle tire according to the invention comprises 20 at least one needle-shaped conductive rubber chimney having a width of between 0.05 - 3.0 mm, more preferably of between 0.10 - 2.5 mm, and most preferably of between 0.15 and 2 mm.
In another preferred embodiment of the method, the tool comprises a thin plate with a 25 sharp edge, and the plate is driven into the co-extrusion with said edge such that a plateshaped rubber chimney is formed. The plane of the plate-shaped rubber chimney may be perpendicular or substantially parallel to the circumferential direction of the tire.
According to the invention the needle-shaped conductive rubber members may be 30 driven into the formed co-extrusion inwardly from the top and/or from the bottom surface. The direction under which the chimney(s) are provided in the tire is not limited to a direction perpendicular to the circumferential direction of the tire but may include any direction with an angle to the circumferential direction of the tire. In such 5 embodiment the conductive rubber chimneys may be disposed on a slant with the circumferential direction.
A preferred method according to the invention is characterized in that the method 5 comprises co-extruding the tread layer, the tread base layer and a conductive rubber member that extends in the circumferential direction of the tire and in the radial direction of the tire from the ground contacting surface to above the conductive base layer, and driving at least one part of the conductive rubber member further into the formed co-extrusion until said part forms a conductive rubber chimney that extends 10 from the conductive rubber member to, into or beyond the conductive base layer. This embodiment is advantageous in that a precursor (the conductive member) for the conductive rubber chimney(s) is already present in the green tire which allows a higher production rate and improved antistatic behavior. After the tread portion of the tire has been co-extruded and the conductive chimney(s) formed as described above, the tire is 15 vulcanized according to well known practices.
In another preferred embodiment, a vehicle tire is provided wherein the conductive rubber member extends substantially over the total circumference of the tire. The, preferably needle-shaped, conductive rubber chimney(s) originating from the 20 conductive rubber member may vary in number in the circumferential direction of the tire, and their amount preferably ranges from 1 to 50, more preferably from 2 to 25 and most preferably from 4 to 10.
In yet another preferred embodiment of the tire, such tire comprises between 1 and 200, 25 more preferably between 8 and 100, an most preferably between 16 and 40 in total of the preferably needle-shaped conductive rubber chimneys. The chimneys may be regularly disposed in the circumferential and width direction of the tire or in an irregular, and even random fashion.
30 The total surface area of the conductive rubber chimneys of the vehicle tire according to the invention preferably ranges from 1 to 50% of the total ground contacting surface area, more preferably from 1 to 25% and most preferably from 1 to 5 %. The surface area of the conductive rubber chimneys may be exposed at the ground contacting surface of the tread portion or, in another embodiment, may not be exposed at the 6 ground contacting surface of the tire but at the interface surface with the conductive rubber member instead.
It may be advantageous to provide an embodiment of the method, wherein the at least 5 one conductive rubber chimney is driven into the formed co-extrusion by adding additional conductive rubber (solution) to the tire under pressure. In yet another embodiment of the invention wherein the tread layer, the tread base layer and a conductive rubber member are co-extruded, parts of the conductive rubber member are driven into the formed co-extruded tire by adding additional conductive rubber 10 (solution) to the tire under pressure. The conductive rubber chimneys are then provided by adding additional conductive rubber to the co-extrusion under pressure.
In another preferred embodiment of the method according to the invention, the at least one conductive rubber chimney is driven into the formed co-extrusion in at most four 15 distinct positions in the width direction of the tire. In yet another embodiment of the invention wherein the tread layer, the tread base layer and a conductive rubber member are co-extruded, parts of the conductive rubber member are driven into the formed coextrusion in at most four distinct positions in the width direction of the tire.
20 In yet another preferred embodiment of the method according to the invention, the at least one conductive rubber chimney is driven into the formed co-extrusion in at most two distinct positions in the circumferential direction of the tire. In yet another embodiment of the invention wherein the tread layer, the tread base layer and a conductive rubber member are co-extruded, parts of the conductive rubber member are 25 driven into the formed co-extrusion in at most four distinct positions in the width direction of the tire.
The invention further relates to a device for carrying out the above described method. According to the invention the device comprises a co-extruder for extruding the tread 30 layer and tread base layer, and driving means for driving at least a part of the conductive rubber member into the formed co-extrusion in a radially inward direction. Such a device allows to economically manufacture an antistatic vehicle tire comprising a poorly conducting tread layer that provides a ground contacting surface disposed in a radially outward part of the tread layer, and a optionally conductive tread base layer 7 arranged underneath the tread layer, the tread portion thereof comprising at least one chimney of conductive rubber somewhere in the circumferential direction of the tire, which chimney extends from the ground contacting surface to, into or beyond the conductive base layer.
5 A preferred embodiment of the invention provides a device further comprising a means for coating the co-extrusion, originating from the co-extruder. In another preferred embodiment, the device further comprising a co-extruder for extruding the tread layer, the tread base layer and a conductive rubber member.
10
Any driving means known in the art may be used for the purpose but a device, wherein the driving means comprise a tool adapted to drive a part of the conductive rubber member into a formed co-extrusion by pushing is preferred, a device, wherein the driving means comprise a needle and/or a thin plate with a sharp edge being particularly 15 preferred. A practical embodiment of the device according to the invention comprises driving means in the form of a rotating wheel with at least one tool provided along its circumference.
The invention further relates to a vehicle tire comprising a poorly conducting tread layer 20 that provides a ground contacting surface disposed in a radially outward part of a tread portion, and a optionally conductive tread base layer arranged underneath the tread layer, the tread portion comprising at least one member of conductive rubber, the member comprising at least one conductive rubber chimney that extends in the radial direction of the tire from the ground contacting surface to at least the conductive base 25 layer, whereby the chimney of conductive rubber has been formed by driving a part of said member into the tire in a radial direction.
In a preferred embodiment of the vehicle tire according to the invention, the tire comprises a conductive rubber member that extends in the circumferential direction of 30 the tire and in the radial direction of the tire from the ground contacting surface to above the conductive base layer, the tread portion comprising at least one chimney of conductive rubber somewhere in the circumferential direction of the tire, which chimney extends from the ground contacting surface to, into or beyond the conductive base layer, whereby the chimney of conductive rubber has been formed by driving at 8 least one part of the conductive rubber member further into the formed co-extrusion, more preferably in a radially inward direction thereof.
The invention will now be further elucidated on the basis of the accompanying figures, 5 without however being limited thereto. In the figures:
Figure 1 schematically shows a perspective view of a cross-sectional part of a tire according to an embodiment of the invention;
Figure 2 schematically shows a cross-section of the tread portion 20 of the tire of figure 1 after co-extrusion and before molding into shape; 10 Figure 3 schematically shows a perspective view of a cross-sectional part of the tire according to another embodiment of the invention; and
Figure 4 schematically shows a cross-section of the tread portion 20 of the tire of figure 3 after co-extrusion and before molding into shape.
15 Referring to figure 1, tire 1 comprises a sidewall portion 10 of a rubber polymer and a tread portion 20 that is composed of different parts as elucidated below. The tread portion 20 of the embodiment shown comprises a poorly conducting tread layer 21 that provides a ground contacting surface 23 disposed in a radially outward part of the tread portion 20. The tread layer 21 is provided with longitudinal grooves 22 and possibly 20 transverse grooves (not shown). The tread portion 20 further comprises an undertread layer 26 arranged underneath the tread layer 21, and a conductive tread base layer 24.
At the sides of the tread portion 20, wing tips 25 are provided which may be made of conductive or poorly conductive rubber. In the embodiment shown, sidewall portion 10 is provided with an inner layer 11 of a rubber that may differ from the rubber used in an 25 outer coating layer 12. A carcass layer 13 of preferably steel, nylon, rayon or polyester cords is embedded in layer 12 and mechanically connected to the bead region 14.
According to the method according to the invention, at least the tread layer 21 and the tread base layer 24 are co-extruded whereafter the co-extrusion is provided with a 30 conductive rubber member which in the embodiment shown in figures 1 and 2 comprises a conductive rubber solution coating 37 that has been applied over part of the upper surface of the co-extrusion (21, 26, 24), or, as shown over substantially the complete upper surface of the co-extrusion (21,26,24). As shown in figure 1 and 2, at least a part of the conductive rubber solution coating (37) is then driven into the formed 9 co-extrusion to form a conductive rubber chimney (30) that at least extends between the ground contacting surface (23) and the conductive base layer (24). Please note that the coating layer (37) can also be applied as a conductive film.
5 As schematically shown in figure 2, a device is used thereto comprising driving means in the form of a rod- or needle-shaped tool 2,which tool 2 is adapted to drive the conductive rubber into the formed co-extruded tire part 20 by pushing the tool into part 20 in a radially inward direction 3. After retracting tool 2, a conductive needle-shaped conductive rubber member 30 is formed in part 20, as shown in the position at the right 10 of figure 2.
According to another embodiment of the method of the invention, at least the method comprising co-extruding the tread layer 21, the tread base layer 24 and two conductive rubber members 27 that extend in the circumferential direction 4 of the tire 1 and in the 15 radial direction 3 of tire 1 from the ground contacting surface 23 to above the conductive base layer 24, whereafter at least part of the conductive rubber members 27 is driven into the formed co-extruded tire 1 to such extent that needle-shaped conductive rubber members 30 are formed that extend from the conductive rubber members 27 to or into the conductive base layer 24 as shown in figure 3 for one embodiment.
20
As schematically shown in figure 4, a device is used thereto comprising driving means in the form of a rod- or needle-shaped tool 2,which tool 2 is adapted to drive part of the conductive rubber members 27 into the formed co-extruded tire part 20 by pushing the tool into part 20 in a radially inward direction 3. After retracting tool 2, a conductive 25 needle-shaped conductive rubber member 30 is formed in part 20, which member 30 comprises material driven out of conductive members 27, as shown in the position at the right of figure 4.
The rubber composition used for the tread layer 21 of the present invention comprises 30 fillers containing at least silica to enhance the performance of the tire when driving on wet roads in particular and provide economical rolling resistance, while the specific resistance of the rubber composition will generally be larger than 108 Ω.αη3 as a result of such formulations. The rubber compounds used in other parts of the tire may be synthetic rubbers or natural rubber and blends thereof. Examples of synthetic rubbers 10 include ethylene-propylene-diene copolymer rubber (EPDM), polyisoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene rubber (SBR), butyl rubber, and halogenated butyl rubber. Among these rubbers, SBR, such as SBR obtained by emulsion polymerization and SBR obtained by solution polymerization are preferably 5 used.
Typical fillers used in conductive parts of the tire comprise carbon black and/or ionic salts in amounts sufficient to obtain a specific resistance lower than 106 Ω.αη3. Silane coupling agent may be used if desired, as well as other ingredients generally used in the 10 rubber industry, such as zinc oxide, stearic acid, antioxidants, wax, and vulcanizing agents, within a range such the advantages of the present invention are not adversely affected. The conductive rubber compounds used in the tire for the tread base layer 24, the wing tips 25 and/or the conductive rubbers members (27, 30) may be different or the same. The tread portion 20 may comprise further layers apart from the tread layer 21 15 and the tread base layer 24, such as for instance an undertread layer. Such layers are most conveniently co-extruded together with tread layer 21, tread base layer 24, and, for some embodiments, conductive rubber member 27. The conductive tread base layer 24 may be any conductive layer arranged underneath the tread layer (21) and making conductive contact with other conductive parts of the tire.
20

Claims (20)

1. Werkwijze voor het vervaardigen van een voertuigband (1), waarvan het loopvlakdeel (20) een slecht geleidende loopvlaklaag (21) omvat, die een 5 contactoppervlak (23) met de grond verschaft en die zich in een radiaal buitenwaarts gedeelte van het loopvlakdeel (20) bevindt, en een, bij voorkeur geleidende loopvlakonderlaag (24) die is aangebracht onder de loopvlaklaag (21), de werkwijze omvattende het co-extruderen van de loopvlaklaag (21) en de loopvlakonderlaag (24), het voorzien van het co-extrudaat van een geleidend rubberdeel (27) en het drijven van 10 ten minste een gedeelte van het geleidend rubberdeel (27) in het gevormde co-extrudaat zodat een geleidende rubberschoorsteen (30) wordt gevormd die zich ten minste uitstrekt tussen het contactoppervlak (23) met de grond en de bij voorkeur geleidende onderlaag (24).Method for manufacturing a vehicle tire (1), the tread part (20) of which has a poorly conductive tread layer (21), which provides a contact surface (23) with the ground and which is located in a radially outward part of the tread part (20), and a preferably conductive tread underlayer (24) disposed under the tread layer (21), the method comprising co-extruding the tread layer (21) and the tread underlayer (24), providing the tread -extrudate of a conductive rubber part (27) and driving at least a portion of the conductive rubber part (27) into the formed co-extrudate so that a conductive rubber chimney (30) is formed that extends at least between the contact surface (23) ) with the ground and the preferably conductive bottom layer (24). 2. Werkwijze volgens conclusie 1, waarin het geleidend rubberdeel (27) wordt verschaft door het co-extrudaat te coaten met een geleidende rubber(oplossing).The method of claim 1, wherein the conductive rubber member (27) is provided by coating the co-extrudate with a conductive rubber (solution). 3. Werkwijze volgens conclusie 1 of 2, waarin het geleidend rubberdeel (27) wordt verschaft door het tezamen met de loopvlaklaag en de loopvlakonderlaag te co- 20 extruderen.3. Method according to claim 1 or 2, wherein the conductive rubber part (27) is provided by co-extruding it together with the tread layer and the tread bottom layer. 4. Werkwijze volgens één der conclusies 1-3, waarin het geleidend rubberdeel (27) zich uitstrekt in de omtreksrichting (4) van de band en in de radiale richting (3) van de band vanaf het contactoppervlak (23) met de grond tot boven de bij voorkeur geleidende 25 onderlaag (24).Method according to any one of claims 1-3, wherein the conductive rubber part (27) extends in the circumferential direction (4) of the tire and in the radial direction (3) of the tire from the contact surface (23) to the ground above the preferably conductive bottom layer (24). 5. Werkwijze volgens één der conclusies 1-3, waarin de geleidende rubberschoorsteen (30) zich uitstrekt van het geleidend rubberdeel (27) tot, in of voorbij de bij voorkeur geleidende onderlaag (24). 30A method according to any one of claims 1-3, wherein the conductive rubber chimney (30) extends from the conductive rubber part (27) to, in or beyond the preferably conductive bottom layer (24). 30 6. Werkwijze volgens één der voorgaande conclusies, waarin de geleidende rubberschoorsteen (30) wordt gevormd door een gereedschap (2) in het gevormde co-extrudaat te duwen.A method according to any one of the preceding claims, wherein the conductive rubber chimney (30) is formed by pushing a tool (2) into the formed co-extrudate. 7. Werkwijze volgens conclusie 6, waarin het gereedschap (2) een naald omvat en een naaldvormige rubberschoorsteen (30) wordt gevormd.The method of claim 6, wherein the tool (2) comprises a needle and a needle-shaped rubber chimney (30) is formed. 8. Werkwijze volgens conclusie 6, waarin het gereedschap (2) een dunne plaat met 5 een scherpe rand omvat, en de plaat in het co-extrudaat wordt gedreven met genoemde rand en een plaatvormige mbberschoorsteen (30) wordt gevormd.A method according to claim 6, wherein the tool (2) comprises a thin plate with a sharp edge, and the plate is driven into the co-extrudate with said edge and a plate-shaped mb chimney (30) is formed. 9. Werkwijze volgens één der voorgaande conclusies, waarin de geleidende rubberschoorsteen (30) wordt verschaft door bijkomend geleidend rubber onder druk 10 toe te voegen aan het co-extrudaat.A method according to any one of the preceding claims, wherein the conductive rubber chimney (30) is provided by additionally adding conductive rubber under pressure to the co-extrudate. 10. Werkwijze volgens één der voorgaande conclusies, waarin de geleidende rubberschoorsteen (30) in het gevormde co-extrudaat wordt gedreven in ten hoogste vier onderscheidenlijke posities in de breedterichting (5) van de band. 15A method according to any one of the preceding claims, wherein the conductive rubber chimney (30) in the formed co-extrudate is driven in at most four respective positions in the width direction (5) of the tire. 15 11. Werkwijze volgens één der voorgaande conclusies, waarin de geleidende rubberschoorsteen (30) in het gevormde co-extrudaat wordt gedreven in ten hoogste twee onderscheidenlijke posities in de omtreksrichting (4) van de band.A method according to any one of the preceding claims, wherein the conductive rubber chimney (30) in the formed co-extrudate is driven in at most two respective positions in the circumferential direction (4) of the tire. 12. Inrichting voor het vervaardigen van een voertuigband omvattende een slecht geleidende loopvlaklaag (21) die een contactoppervlak (23) met de grond verschaft, en die zich in een radiaal buitenwaarts gedeelte van het loopvlakdeel (20) bevindt, en een, bij voorkeur geleidende loopvlakonderlaag (24) die is aangebracht onder de loopvlaklaag (21), waarbij het loopvlakdeel (20) een geleidendrubberdeel (27) enten 25 minste één geleidende rubberschoorsteen (30) omvat, welke schoorsteen (30) zich uitstrekt in the radiale richting (3) van de band tussen het contactoppervlak (23) met de grond en ten minste de bij voorkeur geleidende onderlaag (24), de inrichting omvattende een co-extruder voor het extruderen van de loopvlaklaag (21) en de loopvlakonderlaag (24), en drijfmiddelen (2) voor het drijven van ten minste een 30 gedeelte van het geleidende rubberdeel (30) in het gevormde co-extrudaat in een radiaal inwaartse richting.Device for manufacturing a vehicle tire comprising a poorly conductive tread layer (21) which provides a contact surface (23) with the ground, and which is located in a radially outward portion of the tread part (20), and a, preferably conductive tread bottom layer (24) disposed below the tread layer (21), the tread part (20) comprising a conductive rubber part (27) at least one conductive rubber chimney (30), which chimney (30) extends in the radial direction (3) of the tire between the contact surface (23) with the ground and at least the preferably conductive bottom layer (24), the device comprising a co-extruder for extruding the tread layer (21) and the tread bottom layer (24), and driving means ( 2) for driving at least a portion of the conductive rubber member (30) into the formed co-extrudate in a radially inward direction. 13. Inrichting volgens conclusie 12, waarbij de inrichting verder middelen omvat voor het coaten van het co-extrudaat, dat afkomstig is van de co-extruder.The device of claim 12, wherein the device further comprises means for coating the co-extrudate from the co-extruder. 14. Inrichting volgens conclusie 12 of 13, waarbij de inrichting verder een co-extruder omvat voor het extruderen van de loopvlaklaag (21), de loopvlakonderlaag (24) en het geleidend rubberdeel (27). 5Device according to claim 12 or 13, wherein the device further comprises a co-extruder for extruding the tread layer (21), the tread bottom layer (24) and the conductive rubber part (27). 5 15. Inrichting volgens één der conclusies 12-14, waarin de drijfmiddelen (2) een gereedschap (2) omvatten dat is ingericht om een gedeelte van het geleidend rubberdeel (30) in een gevormde co-geëxtrudeerde band te drijven door duwen.Device according to any of claims 12-14, wherein the driving means (2) comprise a tool (2) adapted to drive a part of the conductive rubber part (30) into a formed co-extruded tire by pushing. 16. Inrichting volgens conclusie 15, waarin de drijfmiddelen een naald en/of een dunne plaat met een scherpe rand omvatten.Device as claimed in claim 15, wherein the floating means comprise a needle and / or a thin plate with a sharp edge. 17. Inrichting volgens conclusie 15 of 16, waarin de drijfmiddelen een draaiend wiel omvatten met ten minste één langs zijn omtrek aangebracht gereedschap (2). 15Device as claimed in claim 15 or 16, wherein the driving means comprise a rotating wheel with at least one tool (2) arranged along its circumference. 15 18. Een voertuigband omvattende een slecht geleidende loopvlaklaag (21) die een contactoppervlak (23) met de grond verschaft, en die zich in een radiaal buitenwaarts gedeelte van het loopvlakdeel (20) bevindt, en een, bij voorkeur geleidende loopvlakonderlaag (24) die is aangebracht onder de loopvlaklaag (21), waarbij het 20 loopvlakdeel (20) tenminste één geleidend rubberdeel (27) omvat, waarbij het rubberdeel (27) ten minste één geleidende rubberschoorsteen (30) omvat, die zich uitstrekt in the radiale richting (3) van de band tussen het contactoppervlak (23) met de grond en ten minste de bij voorkeur geleidende onderlaag (24), waarbij de schoorsteen (30) van geleidend rubber werd gevormd door een gedeelte van genoemd deel (27) in de 25 band te drijven in een radiale richting.A vehicle tire comprising a poorly conductive tread layer (21) which provides a contact surface (23) with the ground and which is located in a radially outward portion of the tread part (20), and a, preferably conductive tread underlay (24) which is arranged under the tread layer (21), the tread part (20) comprising at least one conductive rubber part (27), the rubber part (27) comprising at least one conductive rubber chimney (30) extending in the radial direction (3) ) of the band between the contact surface (23) with the ground and at least the preferably conductive bottom layer (24), the chimney (30) of conductive rubber being formed by placing a portion of said part (27) in the band drive in a radial direction. 19. Een voertuigband volgens conclusie 18, waarin de schoorsteen (30) van geleidend rubber een breedte heeft van 0.1 tot 3.0 mm.A vehicle tire according to claim 18, wherein the chimney (30) of conductive rubber has a width of 0.1 to 3.0 mm. 20. Een voertuigband volgens conclusie 18 of 19, waarin het geleidend rubberdeel (27) zich in hoofdzaak uitstrekt langs de gehele omtrek van de band.A vehicle tire according to claim 18 or 19, wherein the conductive rubber member (27) extends substantially along the entire circumference of the tire.
NL2006420A 2011-03-18 2011-03-18 Method of manufacturing an antistatic vehicle tire and vehicle tire obtainable by the method. NL2006420C2 (en)

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