Golf Club Grip Viscoelasticity Parameter Control
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Solution Overview
Problem
Golf club grips with materials having excellent tensile strength for the outer layer tend to have increased shrinking rates, leading to uneven surfaces and air bubbles when laminated with the inner layer, causing molding failures and initial destruction.
Innovation Solution
A golf club grip design with a cylindrical outer layer and inner layer, where the storage modulus ratio (E′23/E′60) ranges from 1.20 to 1.32, measured under specific dynamic viscoelasticity conditions, to reduce shrinking rates and air bubbles, ensuring a smooth lamination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a material having excellent tensile strength is used in the outer layer of the golf grip, then the tensile strength is improved, but the shrinking rate increases causing uneven surfaces and air bubbles
Solution Approach 1:
The patent applies parameter changes by controlling the storage modulus ratio (E′23/E′60) to fall within the specific range of 1.20 to 1.32. This parameter control allows the outer layer material to have both high tensile strength and reduced shrinking rate, resolving the contradiction between strength improvement and surface uniformity maintenance during manufacturing
2Strength
If a material having excellent tensile strength is used in the outer layer, then the tensile strength is improved, but air bubbles remain during lamination causing molding failure
Solution Approach 1:
The patent resolves the contradiction between tensile strength improvement and molding reliability by precisely controlling the storage modulus ratio parameter (E′23/E′60) within 1.20 to 1.32. This parameter optimization ensures that the material maintains high strength while minimizing air bubble formation during the lamination process, thereby preventing molding failures
3Manufacturing precision
If the storage modulus ratio (E′23/E′60) is increased to reduce shrinking rate, then surface uniformity is improved, but the material becomes too rigid affecting flexibility
Solution Approach 1:
The patent applies parameter changes by defining an optimal range for the storage modulus ratio (E′23/E′60) of 1.20 to 1.32. This controlled parameter range achieves the right balance: it reduces the shrinking rate enough to maintain surface uniformity during manufacturing, while preventing the material from becoming excessively rigid and preserving necessary flexibility for golf grip performance
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 results in a golf club grip with high tensile strength and reduced air bubbles between layers, preventing molding failures and enhancing the grip's durability and performance.
Implementation Method 1
a ratio (E′23/E′60) of a storage modulus (E′23) at the temperature of 23° C. of the outer layer to a storage modulus (E′60) at the temperature of 60° C. of the outer layer, measured with a dynamic viscoelasticity measuring apparatus
Data Source
AI summary
An object of the present invention is to provide a golf club grip having high tensile strength in the outer layer and little entrainment of air between the outer layer and the inner layer. The present invention provides a golf club grip comprising a cylindrical portion composed of a cylindrical inner layer and a cylindrical outer layer covering the inner layer, wherein a ratio (E′23/E′60) of a storage modulus (E′23) at 23° C. of the outer layer to a storage modulus (E′60) at 60° C. of the outer layer, measured with a dynamic viscoelasticity measuring apparatus under measuring conditions of an oscillation frequency: 10 Hz, a strain amplitude: 0.05%, and a tensile mode, ranges from 1.20 to 1.32.