Rubber Laminate with Identical Composition for Tire Label Adhesion
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Solution Overview
Problem
Conventional rubber labels for tires and other rubber articles suffer from distortion and separation during vulcanization due to inadequate tack and peel strength, leading to loss of image clarity and adhesion.
Innovation Solution
A rubber laminate comprising a vulcanized rubber sheet with a degree of vulcanization between 85% and 95%, a rubberized ink layer, and a pressure sensitive adhesive rubber layer, all made from an identical rubber composition, ensuring integrity and strong adhesion to rubber articles without distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the degree of vulcanization is less than 50%, then the thin rubber sheet remains soft and adherent, but the sheet softens and flows during vulcanization causing mark indication distortion
Solution Approach 1:
The patent applies parameter change by precisely controlling the degree of vulcanization to fall within the range of 50-80%, which optimizes the balance between maintaining sufficient tack strength and preventing softening/flow during processing. This specific parameter range resolves the contradiction by finding the optimal point where the rubber sheet has enough adhesion without becoming too soft to maintain image clarity.
2Manufacturing precision
If the degree of vulcanization is over 80%, then the mark indication remains clear, but the tack and peel strength become insufficient causing separation during inflation
Solution Approach 1:
The patent resolves this contradiction by establishing the upper bound of the vulcanization degree parameter at 80%. By controlling the vulcanization degree to not exceed 80%, the patent maintains sufficient tack and peel strength for adhesion while still achieving adequate image clarity, thus balancing both requirements.
Solution Approach 2:
The patent applies partial action by using a moderate degree of vulcanization (50-80%) rather than complete or excessive vulcanization. This partial vulcanization approach provides sufficient image clarity while retaining enough untapped adhesion potential to ensure strong bonding during inflation, avoiding the pitfalls of over-vulcanization.
3Strength
If the laminate layer is uncured or only partially cured with thickness greater than specified, then adhesion is strong, but the applique distorts after vulcanization
Solution Approach 1:
The patent resolves this contradiction by implementing dual parameter control: (1) controlling the degree of vulcanization within 50-80% to maintain adhesion strength, and (2) controlling the thickness of each layer within specific ranges (barrier layer: 0.25-1.77mm, white decorative rubber layer: 0.76-2.54mm) to prevent distortion. This combination of parameters achieves both strong adhesion and dimensional stability.
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 rubber laminate maintains clear image integrity and strong adhesion to rubber articles during vulcanization and inflation, preventing separation and distortion, while ensuring compatibility among the vulcanized rubber sheet, ink layer, and adhesive layer.
Implementation Method 1
a vulcanized rubber sheet having an upper side and a lower side, and the degree of vulcanization of the vulcanized rubber sheet ranges from 85% to 95%
Implementation Method 2
a pressure sensitive adhesive rubber layer disposed on the lower side of the vulcanized rubber sheet
Data Source
AI summary
Provided is a rubber laminate, comprising a vulcanized rubber sheet having a degree of vulcanization in a range from 85% to 95%, a rubberized ink layer, a pressure sensitive adhesive rubber layer and a surface coating layer. The raw materials of the vulcanized rubber sheet, of the rubberized ink layer, and of the pressure sensitive adhesive rubber layer all include an identical rubber composition. Accordingly, the rubber laminate can firmly adhere to a rubber article and does not detach from the rubber article after the vulcanization and inflation of the rubber article.