Butyl Rubber Golf Ball Core for Spin Stability
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Solution Overview
Problem
Golf balls experience instability in spin rate and flight distance due to variations in hitting point and effective loft angle, leading to difficulty in landing on target, and they lack durability and favorable feel upon impact.
Innovation Solution
A golf ball design featuring a spherical core with an inner layer made from crosslinked butyl-based rubber, providing shock absorption and stable deformation, and an outer layer with appropriate hardness distribution for resilience and durability, along with a mid layer for additional resilience performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a core with high resilience performance is used to achieve high flight distance, then flight distance is improved, but spin rate stability and flight distance stability deteriorate due to variations in hitting point and effective loft angle
Solution Approach 1:
The core is divided into inner and outer layers with different material compositions and hardness characteristics. The inner layer uses a specific rubber composition with controlled hardness to provide stability, while the outer layer has different properties to maintain resilience. This local differentiation allows the core to simultaneously achieve high flight distance and stable spin rate despite variations in hitting conditions.
Solution Approach 2:
The core employs composite material construction combining different rubber compositions in inner and outer layers. The inner layer uses a rubber composition with specific hardness characteristics while the outer layer uses a different composition, creating a composite structure that balances resilience for flight distance with stability for consistent spin rate across varying hitting conditions.
2Speed
If a core with high resilience performance is used to achieve high flight distance, then flight distance is improved, but flight distance stability deteriorates due to variations in hitting point and effective loft angle
Solution Approach 1:
The core is divided into inner and outer layers with different material compositions and hardness characteristics. The inner layer uses a specific rubber composition with controlled hardness to provide stability, while the outer layer has different properties to maintain resilience. This local differentiation allows the core to simultaneously achieve high flight distance and stable spin rate despite variations in hitting conditions.
Solution Approach 2:
The core employs composite material construction combining different rubber compositions in inner and outer layers. The inner layer uses a rubber composition with specific hardness characteristics while the outer layer uses a different composition, creating a composite structure that balances resilience for flight distance with stability for consistent spin rate across varying hitting conditions.
3Speed
If the core is made harder to improve resilience performance, then flight distance is improved, but feel at impact and durability deteriorate
Solution Approach 1:
The core is divided into inner and outer layers with different material compositions and hardness characteristics. The inner layer uses a specific rubber composition with controlled hardness to provide stability, while the outer layer has different properties to maintain resilience. This local differentiation allows the core to simultaneously achieve high flight distance and stable spin rate despite variations in hitting conditions.
Solution Approach 2:
The core employs composite material construction combining different rubber compositions in inner and outer layers. The inner layer uses a rubber composition with specific hardness characteristics while the outer layer uses a different composition, creating a composite structure that balances resilience for flight distance with stability for consistent spin rate across varying hitting conditions.
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 design achieves excellent spin rate and flight distance stability, soft feel at impact, and high durability by absorbing shock and maintaining consistent deformation, even with variations in hitting point and loft angle.
Implementation Method 1
the inner layer absorbs shock received by the golf ball when the golf ball is hit, thereby reducing entire deformation of the golf ball caused at the time of hitting
Implementation Method 2
The inner layer is obtained by crosslinking a rubber composition... the inner layer has an appropriate hardness and absorbs shock received by the golf ball when the golf ball is hit, thereby reducing entire deformation of the golf ball caused at the time of hitting
Data Source
AI summary
A golf ball includes a spherical core and a cover positioned outside the core. The core has an inner layer and an outer layer positioned outside the inner layer. The inner layer is obtained by crosslinking a rubber composition. The rubber composition of the inner layer includes a butyl-based rubber as a base rubber. The inner layer has a diameter Di of not less than 10 mm and not greater than 34 mm. A difference (H2−H0) between a Shore C hardness H2 at a surface of the outer layer and a Shore C hardness H0 at a central point of the inner layer is less than 35. Preferably, the butyl-based rubber is a polymer including an isobutylene unit and an isoprene unit, and a derivative thereof.