Tread Guide Strip Resistance Measurement
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Solution Overview
Problem
Vehicle tires with treads designed to prevent electrostatic charging often still become electrostatically charged due to high electrical resistance in the guide strip, which can be caused by fluctuations in the production process.
Innovation Solution
A method and device for determining the electrical resistance of the guide strip between the exterior and interior sides of the tread, outputting a warning signal when resistance exceeds a maximum value, and automatically measuring guide strip resistance using an outer and inner electrode to ensure high conductivity and identify defective sections for elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the rubber supporting area material is made out of rubber and silicon dioxide with little or no soot to reduce roll resistance, then roll resistance is reduced, but the specific electrical resistance becomes very high causing the material to be an insulator
Solution Approach 1:
The patent applies local quality by creating a guide strip with distinct electrical conductivity properties within the tread structure. The guide strip is positioned between the supporting area and the road, forming a localized conductive path that differs from the insulating supporting area material. This allows the supporting area to maintain its low roll resistance properties while the guide strip provides the necessary electrical conductivity for charge dissipation.
2Reliability
If the tread is designed to prevent electrostatic charging through electrical contact with the road, then electrostatic charges should be avoided, but tires still become electrostatically charged due to high guide strip resistance
Solution Approach 1:
The patent implements preliminary action by measuring the guide strip's electrical resistance during the manufacturing process, before the tread is put into service. The resistance measurement is performed at a defined location within the guide strip, allowing defective sections with excessive resistance to be identified and eliminated from further processing. This preventive approach ensures that only treads with adequate electrical conductivity are used, thereby preventing electrostatic charging issues.
Solution Approach 2:
The patent applies feedback by using the resistance measurement results to control the manufacturing process. When the guide strip resistance exceeds a maximum permissible value, the system provides feedback to eliminate the affected tread section. This closed-loop control ensures that the guide strip maintains the necessary electrical conductivity properties for effective charge dissipation.
3Manufacturing precision
If automatic resistance measurement is implemented to identify defective guide strip sections, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with a simplified electrical measurement approach. By using electrical contacts to measure the resistance of the guide strip, the system avoids the need for complex mechanical testing equipment. The measurement device uses electrical contacts that can be easily applied to the guide strip, providing a straightforward and reliable method for assessing electrical conductivity without adding significant device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively identifies and eliminates sections with high electrical resistance, ensuring the guide strip's functionality and reducing electrostatic charging, thereby improving tire quality and manufacturing efficiency with minimal technical effort.
Implementation Method 1
determining a parameter that correlates with an electrical guide strip resistance of the guide strip between the exterior side and interior side
Data Source
AI summary
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 (W28) 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 (W28) 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 (W28,max).