PVDF Tire Cord with Adhesion Coating for Sensor Integration
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Solution Overview
Problem
Current tire sensors installed in pneumatic vehicle tires can disrupt tire balance and fail to effectively measure properties like rolling resistance, frictional resistance, and abrasion, as they require novel sensor concepts that do not introduce additional imbalances.
Innovation Solution
A cord reinforcement layer for tires comprising end-twisted yarns, where at least one yarn is made of polyvinylidene fluoride (PVDF) with a surface coated by an adhesion-promoting dispersion layer, allowing for the measurement of tire properties through piezo-like effects from mechanical tension and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors are installed in the tire to measure tire properties, then measurement capability is improved, but tire balance is disrupted causing additional imbalances
Solution Approach 1:
The patent combines the measurement function with the existing cord reinforcement structure by embedding PVDF filaments directly into the cord. This integration allows the cord to serve dual purposes: structural reinforcement and sensor functionality, eliminating the need for separate sensor installations that would disrupt tire balance.
Solution Approach 2:
The cord structure is designed to perform multiple functions simultaneously: it provides mechanical reinforcement to the tire while also serving as a sensing element through the PVDF filaments that detect tire properties. This multi-functionality eliminates the need for additional dedicated sensor components.
2Measurement precision
If PVDF yarn is used to measure tire properties through piezo-effect, then measurement capability is improved, but adhesion between yarn and surrounding material may be insufficient
Solution Approach 1:
The patent applies a dispersion coating specifically to the surface of the PVDF filaments, creating a localized adhesion-promoting layer. This coating has different properties than the bulk PVDF material, providing enhanced adhesion to surrounding rubber or polymer materials while preserving the piezoelectric properties of the PVDF core for sensing.
Solution Approach 2:
The patent creates a composite structure where PVDF filaments are coated with a dispersion material. This composite approach combines the piezoelectric properties of PVDF with the adhesion properties of the dispersion coating, achieving both measurement capability and strong bonding to surrounding materials.
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 enables accurate measurement of tire properties such as rolling resistance, frictional resistance, and abrasion without causing tire imbalance, by utilizing the piezo-effect of PVDF yarns and ensuring sufficient adhesion with a dispersion layer, enhancing signal transmission and tire uniformity.
Implementation Method 1
PVDF exhibits a sufficiently large piezo-like effect to obtain an electrical signal. These usual deformations of a reinforcement in a tire include, for example, the mechanical tension of a reinforcement, which changes proportionally to the internal air pressure of the tire, or the dynamic and either damped or undamped vibrations of a reinforcement
Data Source
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AI summary
The invention relates to a cord for use as a reinforcing layer in a reinforcing layer, in particular a belt bandage and/or carcass of a vehicle pneumatic tire, comprising at least a first yarn and a second yarn, wherein the first and the second yarn are twisted together at their ends, characterized in that at least one filament of the first yarn of the cord, a majority of the filaments of the first yarn, or all filaments of the first yarn consist of polyvinylidene fluoride, and the surface of the cord is at least partially covered by an adhesion-promoting layer consisting of a dispersion, wherein the adhesion-promoting layer consists of a dispersion and the dispersion comprises a dispersion matrix and a dispersed phase. The invention also relates to a reinforcing layer, vehicle pneumatic tires, conveyor belts, air springs, drive belts, and hoses, each comprising the cord, as well as the use of the cord for measuring.The invention also relates to a method for measuring and a method for producing the cord.