Golf Ball Polyurethane Cover Viscoelastic Moduli Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional golf ball materials struggle to balance high spin rates on approach shots with low spin rates on driver shots, leading to compromised performance in both distance and control.
Innovation Solution
A golf ball material with a shear loss modulus of 2.11×10^7 Pa or less and a tensile loss modulus to shear loss modulus ratio of 1.78 or more, measured at specific viscoelasticity conditions, is developed to achieve high spin rates on approach shots and low spin rates on driver shots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft cover materials are used to increase spin rate on approach shots, then spin performance on approach shots is improved, but spin rate on driver shots increases resulting in reduced initial velocity and shorter flight distance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the viscoelastic properties of the polyurethane resin, specifically setting the shear loss modulus G'' to 2.11×10^7 Pa or less and the ratio E''/G'' to 1.78 or more. These parameter adjustments enable the material to exhibit different mechanical responses under different impact conditions, achieving high spin on approach shots while maintaining low spin and high velocity on driver shots
Solution Approach 2:
The patent implements dynamics by utilizing the time-dependent and frequency-dependent viscoelastic behavior of the polyurethane resin. The material's response characteristics change based on the impact duration and frequency - approach shots (shorter contact time, higher frequency) generate high spin, while driver shots (longer contact time, lower frequency) maintain low spin and high initial velocity
2Reliability
If conventional soft cover materials are used, then spin rate on approach shots increases, but spin rate on driver shots also increases reducing flight distance
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the viscoelastic parameters of the polyurethane resin. By controlling the shear loss modulus G'' and the ratio E''/G'' within specific ranges, the material achieves differentiated performance: high spin generation for approach shots while maintaining low spin and optimal trajectory for driver shots, thereby maximizing flight distance
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 material effectively enhances spin performance on approach shots while maintaining distance on driver shots, providing a balanced golfing experience.
Implementation Method 1
the material having a shear loss modulus G'' of 2.11×10^7 Pa or less, and a ratio (E''/G'') of a tensile loss modulus E'' to the shear loss modulus G'' of 1.78 or more, when measuring the shear loss modulus G'' in a shear mode and the tensile loss modulus E'' in a tensile mode at conditions of a temperature of 0° C. and oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus
Implementation Method 2
the spin rate on the driver shots correlates with the tensile loss modulus E'' measured in a tensile mode, and the spin rate on the approach shots correlates with the shear loss modulus G'' measured in a shear mode
Data Source
AI summary
An object of the present invention is to provide a golf ball which travels a great distance on the driver shots and stops quickly on the green on the approach shots. The present invention is directed to a golf ball material having a shear loss modulus G″ of 2.11×107 Pa or less, and a ratio (E″/G″) of a tensile loss modulus E″ to the shear loss modulus G″ of 1.78 or more, when measuring the shear loss modulus G″ in a shear mode and the tensile loss modulus E″ in a tensile mode at conditions of a temperature of 0° C., oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus.