Multi-piece Golf Ball Layer Hardness Optimization
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Solution Overview
Problem
Current multi-piece solid golf balls lack optimal performance in distance, spin rate, and scuff resistance, particularly for professional golfers and skilled amateurs, as they fail to achieve a balance in core hardness profile and layer thickness relationships.
Innovation Solution
A multi-piece solid golf ball design with a core diameter of at least 30 mm, featuring a base rubber core, two-layer envelope system, and a urethane resin cover, where the hardness relationship among layers satisfies specific Shore C hardness conditions to reduce spin rate and enhance initial velocity and scuff resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the core hardness is increased to reduce spin rate and improve distance, then the initial velocity and distance performance improve, but the scuff resistance deteriorates
Solution Approach 1:
The golf ball is divided into multiple layers with different hardness characteristics. The core has a specific hardness range (38-50 Shore C) optimized for distance and spin control, while the cover layer provides protection and scuff resistance. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The golf ball uses composite material construction with a rubber core and a separate cover material that has different properties. The core material is optimized for elasticity and spin control, while the cover material provides durability and scuff resistance, creating a composite structure that combines the benefits of both materials.
2Object-affected harmful factors
If the envelope layer thickness is increased to improve scuff resistance, then the protection from external factors improves, but the spin rate on approach shots increases
Solution Approach 1:
The envelope layer is segmented into multiple sub-layers with different thicknesses and material properties. This allows the outer portions to provide scuff resistance while the inner portions maintain close contact with the core to control spin rate on approach shots.
Solution Approach 2:
Different regions of the envelope layer have different thicknesses and material characteristics. The envelope layer is designed with varying local properties to provide scuff resistance where needed while maintaining spin control characteristics in other regions.
3Speed
If the core diameter is increased to improve distance performance, then the initial velocity improves, but the spin rate control on approach shots deteriorates
Solution Approach 1:
The core diameter is optimized within a specific range (32.0-34.0 mm) to balance distance performance and spin control. This parameter optimization ensures that the core provides sufficient initial velocity while maintaining appropriate spin characteristics on approach shots.
Data Source
AI summary
In a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover, the core is formed primarily of a base rubber and has a diameter set in a specific range, the envelope layer, intermediate layer and cover are each formed of resin materials, and the envelope layer is formed into two layers—an inner layer and an outer layer. The center and surface hardnesses of the core, the surface hardness of the inner envelope layer-encased sphere, the surface hardness of the outer envelope layer-encased sphere, the surface hardness of the intermediate layer-encased sphere and the surface hardness of the ball together satisfy a specific relationship. This ball achieves a satisfactory distance on full shots both with a driver and with irons, in addition to which it is superior in the short game and has a good feel at impact and an excellent scuff resistance.