Multi-piece Golf Ball Core and Cover Hardness Profiles
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Solution Overview
Problem
Existing multi-piece solid golf balls fail to simultaneously achieve excellent flight performance, feel on impact, controllability, spin performance, and durability, with previous designs often compromising on one or more of these attributes.
Innovation Solution
A multi-piece solid golf ball with a solid core, an intermediate layer made from a specific resin mixture, and a polyurethane cover, optimized for hardness profiles and dimple configuration, which includes a highly neutralized ionomer in the intermediate layer and polyurethane in the cover to enhance spin performance and scuff resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ionomer cover with high Shore D hardness is used, then durability is improved, but spin performance on approach shots deteriorates
Solution Approach 1:
The cover is divided into two distinct layers: an inner cover layer made of ionomer resin for durability and an outer cover layer made of urethane resin for spin performance. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
The cover uses a composite structure combining ionomer resin and urethane resin in specific layers. The inner layer uses ionomer for its durability and scuff resistance, while the outer layer uses urethane for its spin characteristics, creating a composite material system that achieves both durability and spin performance.
2Reliability
If the cover thickness is increased, then durability is improved, but flight performance deteriorates
Solution Approach 1:
The cover thickness is segmented into two functional layers with specific thickness ranges. The inner cover layer has a thickness of 0.3-1.5mm providing durability, while the outer cover layer has a thickness of 0.1-0.5mm maintaining flight performance. This segmented approach optimizes the overall thickness distribution.
Solution Approach 2:
Different regions of the cover have different thicknesses and material properties tailored to their specific functions. The inner layer is thicker for durability in areas requiring protection, while the outer layer is thinner to maintain aerodynamic properties and flight performance.
3Ease of operation
If a soft intermediate layer material is used, then feel on impact is improved, but rebound deteriorates
Solution Approach 1:
The intermediate layer uses a specific resin mixture with controlled hardness parameters (Shore D 35-55) and composition ratios. By precisely adjusting the hardness and elastic modulus of the intermediate layer, the ball achieves optimal feel on impact while maintaining sufficient rebound through the coordinated design of other layers.
Solution Approach 2:
The intermediate layer employs a composite resin mixture containing specific components in defined ratios, creating a material with balanced mechanical properties that provides both soft feel and adequate rebound characteristics.
4Speed
If the core hardness is increased, then flight performance is improved, but controllability deteriorates
Solution Approach 1:
The core has a non-uniform hardness distribution with different hardness values at different locations and depths. The core hardness varies from the center to the periphery and from the surface inward, with specific hardness ranges defined at different radial positions to optimize both flight performance and controllability.
Solution Approach 2:
The core hardness parameters are precisely controlled within specific ranges (Shore D 20-38 at center, 37-62 at surface) to achieve the desired balance between flight performance and controllability through parameter optimization.
Data Source
AI summary
The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer situated therebetween, and a plurality of dimples on a surface of the ball. The diameter of the solid core, the deflection of the core when compressed under a final load of 130 kgf from an initial load of 10 kgf, the hardness at the center of the core, the hardness in a region 5 mm to 10 mm from the center of the core, the hardness 15 mm from the center of the core, and the surface hardness are set within specific ranges. The intermediate layer is composed primarily of a material obtained by mixing under applied heat a specific resin composition and the cover is formed primarily of polyurethane. And, the number of dimples and the trajectory volume TVT are set within specific ranges. The golf ball of the invention has an excellent flight performance, feel, controllability and scuff resistance.