Vulcanization Tire Label with Dual Primer Layers

Solution Overview

Problem

Conventional adhesive labels for rubber products, such as tires, face challenges in adhering effectively to green rubber surfaces due to their rough and unclean nature, especially during the vulcanization process, which involves high temperatures and pressures, resulting in poor adhesion and durability.

Innovation Solution

A label configuration comprising a facestock layer, a first primer layer, and a second primer layer with different compositions, where the second primer layer has a coating weight greater than 3 gsm, and a reactive adhesive layer with specific components like styrene-isoprene-styrene and styrene-butadiene copolymers, tackifiers, and a phenolic resin curing agent, ensuring strong anchorage and crosslinking during vulcanization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If conventional adhesive labels are applied to green rubber surfaces, then labeling can be performed early in production, but adhesion strength is insufficient due to rough and unclean surfaces

Engineering Contradiction:

Improvelabeling timeVSAvoidadhesion strength

Core Design Contradiction:

Loss of timeVSStrength

Solution Approach 1:

The adhesive system is segmented into multiple functional layers: a first primer layer containing resorcinol-formaldehyde or resorcinol-formaldehyde latex resin for initial surface bonding, and a second primer layer containing chlororesorcinol for enhanced adhesion to the rubber surface. This segmentation allows each layer to perform its specific function optimally, with the first primer providing initial anchorage and the second primer ensuring strong bond to the rough green rubber surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The label structure uses composite materials combining different resin systems (resorcinol-formaldehyde and chlororesorcinol) in separate primer layers. This composite approach leverages the complementary properties of each resin: resorcinol-formaldehyde provides good adhesion to the facestock and initial surface bonding, while chlororesorcinol enhances adhesion to the rough rubber surface, achieving superior overall adhesion strength.

Inventive Principle:

Principle #40Composite materials

2Loss of time

If labels are applied before vulcanization, then tracking information can be established early, but labels must endure high temperatures and pressures during vulcanization

Engineering Contradiction:

Improvelabeling timeVSAvoidvulcanization temperature

Core Design Contradiction:

Loss of timeVSTemperature

Solution Approach 1:

The primer layers undergo parameter changes during vulcanization, transitioning from their initial state to a crosslinked cured state. The resorcinol-formaldehyde and chlororesorcinol resins are designed to withstand and respond to the high temperature and pressure conditions of vulcanization, transforming into a durable, heat-resistant bonding structure that anchors the label to the tire throughout the vulcanization process and beyond.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If single primer layer is used, then manufacturing is simpler, but adhesion strength to rough rubber surfaces is insufficient

Engineering Contradiction:

Improvelabel manufacturing complexityVSAvoidadhesion strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The adhesive system is segmented into multiple functional layers: a first primer layer containing resorcinol-formaldehyde or resorcinol-formaldehyde latex resin for initial surface bonding, and a second primer layer containing chlororesorcinol for enhanced adhesion to the rubber surface. This segmentation allows each layer to perform its specific function optimally, with the first primer providing initial anchorage and the second primer ensuring strong bond to the rough green rubber surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The label structure uses composite materials combining different resin systems (resorcinol-formaldehyde and chlororesorcinol) in separate primer layers. This composite approach leverages the complementary properties of each resin: resorcinol-formaldehyde provides good adhesion to the facestock and initial surface bonding, while chlororesorcinol enhances adhesion to the rough rubber surface, achieving superior overall adhesion strength.

Inventive Principle:

Principle #40Composite materials

4Reliability

If labels require superior adhesion and durability, then performance throughout tire life cycle is improved, but label structure becomes more complex

Engineering Contradiction:

Improvelabel durabilityVSAvoidlabel structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The adhesive system is segmented into multiple functional layers: a first primer layer containing resorcinol-formaldehyde or resorcinol-formaldehyde latex resin for initial surface bonding, and a second primer layer containing chlororesorcinol for enhanced adhesion to the rubber surface. This segmentation allows each layer to perform its specific function optimally, with the first primer providing initial anchorage and the second primer ensuring strong bond to the rough green rubber surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The label structure uses composite materials combining different resin systems (resorcinol-formaldehyde and chlororesorcinol) in separate primer layers. This composite approach leverages the complementary properties of each resin: resorcinol-formaldehyde provides good adhesion to the facestock and initial surface bonding, while chlororesorcinol enhances adhesion to the rough rubber surface, achieving superior overall adhesion strength.

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

The solution provides superior adhesion, durability, and chemical resistance, allowing the labels to become structurally bonded to the cured rubber, maintaining performance throughout the tire's life cycle with enhanced peel strength and mechanical properties.

Implementation Method 1

a reactive adhesive layer with specific components like styrene-isoprene-styrene and styrene-butadiene copolymers, tackifiers, and a phenolic resin curing agent, ensuring strong anchorage and crosslinking during vulcanization

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Implementation Method 2

a first primer layer, a second primer layer comprising a zinc oxide... wherein the two primer layers have different compositions... providing superior adhesive properties

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS11466180B2Vulcanization tire label

Publication Date: 2022.10.11 AVERY DENNISON CORP

AI summary

The present application relates to a vulcanization label that can be used to label tires. The label comprises a facestock layer, a first primer layer, a second primer layer comprising a zinc oxide, and a reactive adhesive layer. The two primer layers have different compositions. The second primer layer has a coating weight that is greater than 3 gsm. At least a portion of the second primer is in contact with at least a portion of the reactive adhesive layer.