Tyre Reinforcing Strip With Single-Cord Yarn for Lower Rolling Resistance

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Solution Overview

Problem

Existing methods for producing reinforcing strips for vehicle tires, particularly for the belt bandage, are inefficient and costly due to issues such as imprecise cutting, filament breakage, and complex twisting processes, leading to increased material usage and rolling resistance.

Innovation Solution

The use of a single cord made of multifilament yarn with a twist factor of 105 to 200, preferably 110 to 150, which is extruded through a template to form a reinforcing strip, reducing filament breakage and material usage, and allowing for a simpler and cost-effective production process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If fabric is cut into strips using conventional cutting processes, then reinforcing agents can be embedded in rubber compound, but individual reinforcing agents can be damaged or severed resulting in lack of desired strength

Engineering Contradiction:

Improveease of manufactureVSAvoidmanufacturing precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The fabric is segmented into individual strips by cutting along the warp threads, separating the reinforcing agents into discrete strips that can be individually embedded in the rubber compound without damage to the reinforcing agents

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fabric is pre-oriented with warp threads running in the desired strip direction before cutting, ensuring that the cutting process separates threads cleanly without damaging the reinforcing agents

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If additional weft threads are added to stabilize fabric during cutting, then fabric stability is improved, but device complexity and material usage increase

Engineering Contradiction:

ImprovestabilityVSAvoidcomplexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The stabilizing weft threads are extracted/removed after the cutting process, eliminating the need for additional stabilizing materials while maintaining fabric stability during the critical cutting operation

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The fabric is pre-oriented and tensioned in a specific manner before cutting that provides inherent stability during the cutting process without requiring additional stabilizing threads

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If conventional twisting processes are used for multifilament yarn, then yarn can be formed, but filament breakage and material accumulation in template occur

Engineering Contradiction:

Improveease of manufactureVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The twisting parameters are optimized by controlling the twist factor within a specific range (105-200), preventing excessive twisting that causes filament breakage and material accumulation while ensuring proper yarn formation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The twisting process is applied periodically at controlled intervals during yarn formation, allowing filaments to be twisted uniformly without excessive force that would cause breakage or accumulation

Inventive Principle:

Principle #19Periodic action

4Strength

If multiple twisted multifilament yarns are used to form cord, then cord strength is improved, but layer thickness and rolling resistance increase

Engineering Contradiction:

ImprovestrengthVSAvoidweight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

Multiple yarns are merged into a single cord structure with optimized twist, combining the strength of multiple filaments while maintaining a compact structure that minimizes layer thickness and rolling resistance

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cord is formed as a composite structure of twisted multifilament yarns with controlled twist factor, achieving high strength through fiber arrangement and twist geometry rather than increasing material quantity

Inventive Principle:

Principle #40Composite 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

This approach results in a reinforcing strip with improved reliability, reduced layer thickness, and lower rolling resistance, enabling cost-effective tire manufacturing with enhanced strength and performance.

Implementation Method 1

The use of a single cord made of multifilament yarn with a twist factor of 105 to 200, preferably 110 to 150, which is extruded through a template to form a reinforcing strip

Methodology Applied

Scientific EffectExtrusion: Extrusion

Data Source

PatentEP4703151A1Reinforcing strip for a vehicle tyre, method for producing same and vehicle tyre

Publication Date: 2026.03.04 CONTINENTAL REIFEN DEUTSCHLAND GMBH

AI summary

The invention relates to a reinforcing strip for a vehicle tire, preferably for a belt ply of a pneumatic vehicle tire, wherein the reinforcing strip comprises rubber material in which only one textile reinforcement carrier or only a group of parallel and spaced-apart textile reinforcement carriers is or are embedded. The invention further relates to a method for manufacturing a strip and a tire comprising a strip. The objective is cost-effective and simple manufacturability. This is achieved by forming the reinforcement carrier as a single cord made of exactly one multifilament yarn having a twist factor of 105 to 200, preferably 110 to 150.