Golf Ball Cover Material Loss Elastic Modulus Control
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Solution Overview
Problem
Existing golf ball cover materials using ionomer resin or polyurethane fail to provide optimal spin performance across different shots, with ionomer resin offering poor shot feeling and insufficient spin, while polyurethane improves these aspects but not sufficiently for varying shot types.
Innovation Solution
A golf ball cover material with specific loss elastic modulus ranges (E″−40 from 6.50×10^7 Pa to 22.0×10^7 Pa at −40° C., and E″−20 from 3.50×10^7 Pa to 7.10×10^7 Pa at −20° C.) measured using a dynamic viscoelasticity apparatus, which is formulated with a polyurethane obtained from a reaction between a polyol and a polyisocyanate, enhancing spin control for short iron and driver shots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionomer resin is used as the cover material, then durability and processability are improved, but shot feeling and spin performance deteriorate due to high rigidity and hardness
Solution Approach 1:
The patent changes the physical and chemical parameters of the cover material by using polyurethane resin instead of ionomer resin, specifically controlling the loss elastic modulus within a specific range (1.95×10^7 Pa or less) to achieve optimal shot feeling and spin performance while maintaining durability
Solution Approach 2:
The patent employs polyurethane resin as a composite material that combines the benefits of durability with improved shot feeling and spin performance, creating a cover material that balances multiple performance requirements through its specific molecular structure and mechanical properties
2Reliability
If ionomer resin is used as the cover material, then durability is improved, but spin performance deteriorates due to high rigidity
Solution Approach 1:
The patent changes the mechanical parameters of the cover material by controlling the loss elastic modulus to 1.95×10^7 Pa or less, which enables the material to generate appropriate spin on various shots while maintaining the durability required for golf ball covers
Solution Approach 2:
The patent utilizes the viscoelastic properties of polyurethane resin, which exhibit temperature-dependent phase transitions in their mechanical behavior, allowing the cover to provide consistent spin performance across different playing conditions while maintaining structural integrity
3Ease of operation
If polyurethane is used as the cover material, then shot feeling and spin performance are improved, but controllability across different shot types deteriorates
Solution Approach 1:
The patent optimizes the loss elastic modulus parameter within a specific range (1.95×10^7 Pa or less) to achieve a balance where the cover provides excellent shot feeling on short iron shots while maintaining appropriate spin control on driver shots, thereby improving overall adaptability across different shot types
Solution Approach 2:
The patent utilizes the dynamic viscoelastic properties of polyurethane resin that allow the cover material to adapt its mechanical response based on the impact conditions, providing high spin on short iron shots through increased deformation while maintaining lower spin on driver shots through reduced deformation
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 proposed golf ball cover material achieves increased spin rates on short iron shots and decreased spin rates on driver shots, thereby improving shot control and feel.
Implementation Method 1
a loss elastic modulus (E″−40) in a range from 6.50×107 Pa to 22.0×107 Pa at a measuring temperature of −40° C., and a loss elastic modulus (E″−20) in a range from 3.50×107 Pa to 7.10×107 Pa at a measuring temperature of −20° C., when measured using a dynamic viscoelasticity measuring apparatus
Data Source
AI summary
An object of the present disclosure is to provide a novel golf ball cover material from which a golf ball showing a high spin rate on short iron shots and a low spin rate on driver shots is obtained. The present disclosure provides a golf ball cover material having a loss elastic modulus (E″−40) in a range from 6.50×107 Pa to 22.0×107 Pa at a measuring temperature of −40° C., and a loss elastic modulus (E″−20) in a range from 3.50×107 Pa to 7.10×107 Pa at a measuring temperature of −20° C., when measured using a dynamic viscoelasticity measuring apparatus under following measuring conditions:<Measuring conditions>Measuring mode: tensile modeMeasuring temperature: −100° C. to 100° C.Temperature rising rate: 4° C./minuteOscillation frequency: 10 HzMeasuring strain: 0.05%.