Noise Absorber Adhesion in Pneumatic Tires via Primer Penetration
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Solution Overview
Problem
Existing methods for affixing noise absorbers to pneumatic tire inner surfaces face challenges in achieving both effective air retention and adhesion without compromising tire productivity, as conventional methods either result in poor adhesion, air leakage, or longer manufacturing times.
Innovation Solution
A pneumatic tire is manufactured using a bladder with a coating layer of release agent, where the noise absorber is fixed to the tire inner surface via an adhesive layer with a silicon content of 0.1 wt.% to 10.0 wt.%, ensuring improved air retention and adhesion without compromising productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the noise absorber is directly adhered to the tire inner surface where release agent is applied, then adhesion is improved, but air retention deteriorates due to poor sealing
Solution Approach 1:
A primer layer is introduced as an intermediary substance between the release agent and the adhesive. The primer penetrates through the release agent layer to bond with the tire inner surface, creating a secure foundation that allows the adhesive to effectively bond the noise absorber while maintaining air retention through proper sealing.
Solution Approach 2:
The invention changes the parameters of the release agent layer by controlling its thickness and silicon content (0.1-10 wt%). By optimizing these parameters, the release agent layer becomes permeable enough to allow primer penetration while maintaining its release function, thus enabling both adhesion and air retention.
2Strength
If the release agent is removed by buffing the tire inner surface, then adhesion is improved, but air retention deteriorates due to innerliner thinning
Solution Approach 1:
The primer is applied in advance to penetrate through the release agent layer and bond with the tire inner surface before the adhesive is applied. This preliminary action creates a strong bonding foundation that eliminates the need for buffing, thereby preserving the innerliner thickness and maintaining air retention.
Solution Approach 2:
The primer serves as an intermediary that allows the adhesive to bond effectively through the release agent layer without requiring removal of the release agent. This eliminates the buffing process and its harmful effects on the innerliner.
3Strength
If the release agent is completely removed to improve adhesion, then adhesion is improved, but manufacturing time increases due to additional removal steps
Solution Approach 1:
The primer acts as an intermediary that enables effective adhesion without requiring complete removal of the release agent. This eliminates time-consuming removal steps such as buffing or film peeling, thereby maintaining high manufacturing efficiency while achieving reliable adhesion.
Solution Approach 2:
The primer penetration and bonding process is performed as a preliminary step before adhesive application, allowing the subsequent adhesive to bond effectively through the release agent layer. This eliminates the need for separate removal steps, streamlining the manufacturing process.
4Strength
If a film is applied and then peeled after vulcanization to remove release agent, then adhesion is improved, but manufacturing time increases
Solution Approach 1:
The primer serves as an intermediary that enables effective adhesion without requiring film application and peeling steps. By allowing the primer to penetrate through the release agent layer, the invention achieves reliable bonding while eliminating these time-consuming steps, thus reducing manufacturing cycle time.
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 air retention and adhesion of the noise absorber while preventing air leakage and maintaining tire productivity, unlike conventional methods that often compromise these factors.
Implementation Method 1
a noise absorber fixed on an inner surface of a tread portion along a tire circumferential direction via an adhesive layer
Data Source
AI summary
A pneumatic tire that is vulcanized using a bladder provided with a coating layer comprising a release agent, the noise absorber being fixed to the inner surface of the tread portion along the tire circumferential direction via the adhesive layer, and the amount of silicon in the release agent detected by X-ray fluorescence analysis is 0.1 wt. % to 10.0 wt. % at least in the fixation region for the noise absorber.