Method for producing a tread

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 (ρ28) of the guide strip rubber material is less than a specific electrical supporting area resistance (ρ26) of the supporting area rubber material,
• characterized by the steps of:
• (c) determining a parameter (P) that correlates with an electrical guide strip resistance (W28) 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 (W28) exceeds a prescribed maximum value W28,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.

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 (p28) of the guide strip rubber material is less than a specific electrical supporting area resistance (p26) of the supporting area rubber material,
• characterized by the steps of:
• (c) determining a parameter (P) that correlates with an electrical guide strip resistance (W28) 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 (W28) exceeds a prescribed maximum value (W28,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 (Beff) of the electrode (32, 34) can be varied.