RFID Module Covering Layer Calcium Carbonate Shrinkage

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Solution Overview

Problem

Pneumatic tires with embedded RFID modules face challenges in maintaining durability and communication performance due to shrinkage issues in insulating layers caused by silica blending, which affects the shape and radio wave transmission.

Innovation Solution

The use of a covering layer containing calcium carbonate in the RFID module, with a relative dielectric constant of 7 or less, to suppress shrinkage and improve communication performance, combined with a helical antenna design and specific electrical resistivity and storage modulus values, ensures durability and effective radio wave transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If silica is blended into the insulating layer to strengthen insulation, then insulation performance is improved, but the insulating layer shrinks during formation causing shape degradation and reduced durability

Engineering Contradiction:

Improveinsulation performanceVSAvoidshape of covering layer

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent changes the material composition parameter by replacing silica with calcium carbonate as the filler in the covering layer. Calcium carbonate has different physical properties that prevent shrinkage during formation while maintaining the desired dielectric constant (7 or less) for effective RFID communication. This parameter substitution resolves the contradiction between achieving good insulation and maintaining shape stability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the covering layer is made thinner to improve RFID communication performance, then radio wave transmission is improved, but protective effect is reduced

Engineering Contradiction:

Improvecommunication performanceVSAvoidprotective effect

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent creates a composite covering layer material combining rubber or elastomer with calcium carbonate filler (20-55 phr). This composite structure provides both the low dielectric constant needed for good RFID communication and sufficient mechanical strength for protection. The calcium carbonate particles dispersed in the rubber matrix create a material that balances electromagnetic transparency with structural integrity.

Inventive Principle:

Principle #40Composite materials

3Reliability

If calcium carbonate content is increased to lower dielectric constant and improve communication, then radio wave transmission is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecommunication performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent optimizes the calcium carbonate content parameter to a specific range (20-55 phr) that achieves the desired dielectric constant while maintaining manufacturability. This parameter optimization ensures that the material can be processed using conventional rubber compounding and molding techniques without requiring complex manufacturing procedures, thus improving communication performance without excessive manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

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 maintains the shape of the RFID module, enhances communication performance by reducing radio wave attenuation, and improves durability by preventing shrinkage and maintaining protective properties across various temperatures.

Implementation Method 1

the covering layer contains calcium carbonate. This suppresses shrinkage in forming the covering layer compared to a covering layer containing silica

Methodology Applied

Scientific EffectShrinkage suppression:

Implementation Method 2

the relative dielectric constant of the covering layer is 7 or less... the calcium carbonate as a filler contributes to lowering the relative dielectric constant of the covering layer, improving the communication performance of the RFID module

Methodology Applied

Scientific EffectDielectric property: Dielectric Permittivity

Data Source

PatentUS20230085326A1RFID module, and pneumatic tire with the same embedded therein

Publication Date: 2023.03.16 THE YOKOHAMA RUBBER CO LTD

AI summary

Provided are an RFID (radio frequency identification) module and a pneumatic tire in which the RFID module is embedded. An RFID module includes an IC (integrated circuit) substrate that stores data, an antenna that transmits and receives data, and a covering layer that covers the antenna. The covering layer contains calcium carbonate, and a relative dielectric constant of the covering layer is 7 or less.