Rigid Inner Mold Coating Reduces Tire Extraction Force

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Solution Overview

Problem

The existing rigid inner mold methods require significant force to extract segments from a vulcanized tire, risking damage and deformation, and increasing the number of segments or extraction time, which reduces productivity and quality.

Innovation Solution

A rigid inner mold with a coating layer having rubber release properties on its tire molding surface, allowing for reduced pull-out force and efficient disassembly without damaging the tire, using a combination of organic and inorganic materials like fluorine-based resins and metal films.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If the inner mold body is divided into a plurality of inner mold segments, then the extracting force per segment is reduced, but the disassembly extraction time increases

Engineering Contradiction:

Improveextracting forceVSAvoiddisassembly extraction time

Core Design Contradiction:

ForceVSLoss of time

Solution Approach 1:

The inner mold body is divided into a plurality of inner mold segments in the circumferential direction, allowing the mold to be extracted in parts. This segmentation reduces the extracting force required for each individual segment while maintaining the overall effectiveness of the extraction process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A coating layer with rubber release properties is applied to the tire molding surface of the inner mold segments. This coating acts as an intermediary that reduces the adhesion between the rubber and the mold surface, thereby reducing the extracting force required to remove the segments from the vulcanized tire.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If a large force is applied to extract the inner mold segments, then the extraction speed increases, but the tire may be damaged or deformed

Engineering Contradiction:

Improveextraction speedVSAvoidtire damage and deformation

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The coating layer with rubber release properties serves as a protective intermediary between the inner mold segments and the vulcanized tire. This coating reduces the adhesion force, allowing the segments to be extracted with smaller forces that are sufficient for rapid removal without causing damage or deformation to the tire.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The coating layer changes the surface properties of the tire molding surface by providing rubber release properties. This parameter change in surface characteristics reduces the friction and adhesion between the rubber and mold, enabling faster extraction at lower forces that prevent tire damage.

Inventive Principle:

Principle #35Parameter changes

3Force

If the number of inner mold segments is increased, then the extracting force per segment is reduced, but the disassembly operation time increases

Engineering Contradiction:

Improveextracting force per segmentVSAvoidproduction efficiency

Core Design Contradiction:

ForceVSProductivity

Solution Approach 1:

The coating layer with rubber release properties is applied to the tire molding surface of the inner mold segments. This coating acts as an intermediary that reduces the adhesion between the rubber and the mold surface, thereby reducing the extracting force required to remove the segments from the vulcanized tire.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

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 coating layer significantly reduces the pull-out force of inner mold segments, enabling rapid and efficient disassembly without damaging the tire, thereby improving production efficiency and maintaining tire quality.

Implementation Method 1

a coating layer having rubber release property is provided on the tire molding surface

Methodology Applied

Scientific EffectRubber release property: Lubrication

Data Source

PatentEP3115168B1Rigid core for tire forming, and tire manufacturing method using same

Publication Date: 2020.12.30 SUMITOMO RUBBER INDUSTRIES LTD

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AI summary

In an inner mold method, a pull-out force of extracting inner mold segments from a vulcanized tire is reduced. A rigid inner mold 1 is provided with an annular inner mold body 2 having a ti re molding surface S. A rigid core 1 is put into a vulcanization mold B for each green tire T formed on the tire molding surface S, whereby the green tire T is vulcanization-molded between the vulcanization mold B and the inner mold body 2. The inner mold body 2 comprises a plurality of inner mold segments 5 divided in the circumferential direction. A coating layer 11 having rubber release property is formed on the tire molding surface S.