Method for producing a tread
The invention relates to a method for producing a tread ( 20 ), comprising the steps: extruding the tread ( 20 ), which has an outer side ( 22 ) and an inner side ( 24 ), opposite the outer side ( 22 ), and a carrying region ( 26 ) made of a carrying region rubber material and a guide strip ( 28 ) made of a guide strip rubber material, wherein the guide strip ( 28 ) extends from the outside ( 22 ) to the inside ( 24 ) and a specific electrical guide strip resistance (W 28 ) of the guide strip rubber material is smaller than a specific electrical carrying region resistance of the carrying region rubber material. The steps according to the invention are: determining an electrical guide strip resistance (W 28 ) of the guide strip ( 28 ) between the outer side ( 22 ) and the inner side ( 24 ) and outputting a warning signal when the electrical resistance (W) exceeds a specified maximum resistance (W 28,max ).
1. A method for manufacturing a tread ( 20 ), with the steps of:
(a) extruding a tread ( 20 ), which
has an exterior side ( 22 ) and an interior side ( 24 ) lying opposite the exterior side ( 22 ), and
comprises a supporting area ( 26 ) made out of a rubber supporting area material
and a guide strip ( 28 ) made out of a rubber guide strip material,
(b) wherein the guide strip ( 28 ) extends from the exterior side ( 22 ) to the interior side ( 24 ), and a specific electrical guide strip resistance (ρ 28 ) of the guide strip rubber material is less than a specific electrical supporting area resistance (ρ 26 ) of the supporting area rubber material,
characterized by the steps of:
(c) determining a parameter (P) that correlates with an electrical guide strip resistance (W 28 ) of the guide strip ( 28 ) between the exterior side ( 22 ) and interior side ( 24 ), and
(d) outputting a warning signal when the parameter (P) assumes a value indicating that the guide strip resistance (W 28 ) exceeds a prescribed maximum value (W 28,max ),
wherein
(a) determining the parameter (P) involves the step of applying an electrostatic charge (Q) to a side ( 22 , 24 ), and
(b) the parameter (P) describes a charging current (I) that arises when applying an electrostatic charge (Q), and
wherein
the electrostatic charge (Q) is applied without contact.
2. The method according to claim 1 , wherein determining the guide strip resistance (W 28 ) involves the following steps:
contacting the exterior side ( 22 ) by means of an outer electrode ( 32 ), and
contacting the interior side ( 24 ) with an inner electrode ( 34 ),
wherein one of the electrodes ( 22 , 24 ) contacts the tread ( 20 ) from above.
3. The method according to claim 1 , wherein
a region of the tread ( 20 ) in which the maximum resistance (W 28,max ) has been exceeded is eliminated.
4. A method for manufacturing a tread ( 20 ), with the steps of:
(a) extruding a tread ( 20 ), which
has an exterior side ( 22 ) and an interior side ( 24 ) lying opposite the exterior side ( 22 ), and
comprises a supporting area ( 26 ) made out of a rubber supporting area material
and a guide strip ( 28 ) made out of a rubber guide strip material,
(b) wherein the guide strip ( 28 ) extends from the exterior side ( 22 ) to the interior side ( 24 ), and a specific electrical guide strip resistance (ρ 28 ) of the guide strip rubber material is less than a specific electrical supporting area resistance (ρ 26 ) of the supporting area rubber material,
characterized by the steps of:
(c) determining a parameter (P) that correlates with an electrical guide strip resistance (W 28 ) of the guide strip ( 28 ) between the exterior side ( 22 ) and interior side ( 24 ), and
(d) outputting a warning signal when the parameter (P) assumes a value indicating that the guide strip resistance (W 28 ) exceeds a prescribed maximum value W 28,max ),
wherein
(a) determining the parameter (P) involves the step of applying an electrostatic charge (Q) to a side ( 22 , 24 ), and
(b) the parameter (P) describes a charging current (I) that arises when applying an electrostatic charge (Q), and
wherein a voltage (U) measures at least 3 kV when applying the charge.
5. A method for manufacturing a tread ( 20 ), with the steps of:
(a) extruding a tread ( 20 ), which
has an exterior side ( 22 ) and an interior side ( 24 ) lying opposite the exterior side ( 22 ), and
comprises a supporting area ( 26 ) made out of a rubber supporting area material
and a guide strip ( 28 ) made out of a rubber guide strip material,
(b) wherein the guide strip ( 28 ) extends from the exterior side ( 22 ) to the interior side ( 24 ), and a specific electrical guide strip resistance (p 28 ) of the guide strip rubber material is less than a specific electrical supporting area resistance (p 26 ) of the supporting area rubber material,
characterized by the steps of:
(c) determining a parameter (P) that correlates with an electrical guide strip resistance (W 28 ) of the guide strip ( 28 ) between the exterior side ( 22 ) and interior side ( 24 ), and
(d) outputting a warning signal when the parameter (P) assumes a value indicating that the guide strip resistance (W 28 ) exceeds a prescribed maximum value (W 28,max ),
wherein
(a) determining the parameter (P) involves the step of applying an electrostatic charge (Q) to a side ( 22 , 24 ), and
(b) the parameter (P) describes a charging current (I) that arises when applying an electrostatic charge (Q), and
wherein
the electrode ( 32 , 43 ) used in applying the charge has an emission edge ( 58 ), and that
the electrode ( 32 , 34 ) can be turned in such a way that an effective width (B eff ) of the electrode ( 32 , 34 ) can be varied.