C-Check for unparalleled quality standards in tire production
Measuring system checks the conductivity of chimney strips

The new non-contact C-Check system is designed for in-line conductivity measurement of chimney strips directly after the extrusion process. It enables in-process detection of material defects and transmits a warning signal to the operator and the control system. Recipe-controlled positioning combined with automatic height adjustment of the test system ensures uncompromising flexibility and excellent precision.

Text Andreas Weseler  Photos KraussMaffei Berstorff

Chimney strip for electrostatic charge dissipation from tires

"To reduce the rolling resistance of passenger car and truck tires, tire producers often replace carbon black by silica in their rubber compounds used in tread production. Silica is characterized by high electric resistance and acts as an isolator," says Dr. Gerard Nijman, Head of R&D and Rubber Processing Technology at KraussMaffei Berstorff. "For this reason, a continuous conductive strip (chimney) on carbon black basis is required as additional component in the tread profile to eliminate the electrostatic charge from the tire. The chimney strip has a width of a few millimeters only and avoids electrostatic charging by the contact with the road surface."

Chimney strip eliminates the electrostatic charge from tires
New non-contact C-Check system for in-line conductivity measurement of chimney strips

High production reliability

The C-Check system checks the chimney conductivity in-line at variable production speeds. It is designed for non-contact measurement of the electric conductivity between the outside and inside of the tread. The electrode with flexible position charges the strip that is placed on an earthed conveying system. The fully functional chimney strip eliminates the electrostatic charge via an additional grounded electrode. If the electric resistance exceeds the preset value, a signal is transmitted to the operator and recorded by the control system.

The measurement is performed in real time. It can be displayed on a local control panel and additionally transmitted via an appropriate interface. The exceptional functionality of the C-Check system is simply unique on the market.

"We presented the new system for the first time on the occasion of the TireExpo where its simple operation and exceptional measuring precision met with great acclaim among trade visitors."
Dr. Gerard Nijman, Head of R&D and Rubber Processing Technology at KraussMaffei Berstorff

Thanks to the non-contact monitoring principle, there are no restrictions as far as the use of marking systems is concerned. The system can also be integrated into existing lines.

Contact

Dr. Gerard Nijman
gerard.nijman@kraussmaffei.com

Head of R&D and Rubber Processing Technology at KraussMaffei Berstorff