Golf Ball Multi-Layer Core Hardness Gradient
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Solution Overview
Problem
Existing golf ball technologies do not effectively utilize a plasticized polyurethane composition in a multi-layer core construction to achieve optimal hardness and stiffness variations between core layers, limiting performance and durability.
Innovation Solution
A golf ball design featuring a multi-layer core with at least one core layer formed from a plasticized polyurethane composition, comprising a combination of polyurethane and plasticizer, where the inner core layer has a Shore C hardness of 50 or less and the outer core layer has a Shore C hardness of 70 or greater, with specific weight percentages of plasticizer to adjust stiffness and hardness gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plasticized polyurethane composition is used in the inner core layer to reduce hardness and increase elasticity, then the ball's durability and distance are improved, but the core layer hardness becomes too low for optimal performance
Solution Approach 1:
The patent applies local quality by creating distinct hardness zones within the core through multiple layers. The inner core layer uses plasticized polyurethane for softness and elasticity, while the outer core layer uses a harder thermoplastic or thermoset material. This gradient structure (Houter core surface−Hcenter≥40) allows each layer to perform its specific function optimally without compromising overall core strength.
Solution Approach 2:
The patent employs composite materials by combining plasticized polyurethane with other thermoplastic or thermoset materials in a multi-layer construction. The plasticized polyurethane composition (containing 2-50 wt% plasticizer) is复合ed with harder materials to create a core structure that exhibits both the elasticity of soft materials and the strength of hard materials, resolving the contradiction between durability and hardness.
2Ease of operation
If the inner core layer hardness is reduced to 50 or less for better elasticity, then the ball's distance and feel are enhanced, but the overall core strength may be compromised
Solution Approach 1:
The patent segments the core into multiple functional layers with different hardness properties. The inner core layer (diameter ≤1.10 inches) is segmented as a separate entity with Shore C hardness ≤50 for optimal feel and distance, while the outer core layer provides structural support. This segmentation allows the soft inner layer to enhance playing characteristics without compromising overall core strength.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the Shore C hardness values of different core layers (Hcenter≤50, Houter core surface≥70, with a difference ≥40). This parameter differentiation allows the inner layer to provide superior feel and distance while the outer layer maintains core strength, effectively resolving the contradiction between ease of operation and strength.
3Reliability
If a multi-layer core construction is implemented to achieve hardness gradients, then performance is optimized, but the manufacturing complexity increases
Solution Approach 1:
The patent applies the nested doll principle by placing the inner core layer (formed from plasticized polyurethane) inside the outer core layer. This nested multi-layer construction (inner core layer with diameter ≤1.10 inches surrounded by an outer core layer with thickness ≥0.200 inches) achieves complex hardness gradients while maintaining a relatively streamlined manufacturing process through sequential layer formation.
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 solution provides a golf ball with improved core layer hardness and stiffness gradients, enhancing the ball's performance and durability by optimizing the material composition and structure of the multi-layer core.
Implementation Method 1
a plasticized polyurethane composition comprising a polyurethane and a plasticizer
Data Source
AI summary
A golf ball comprising a core and a cover layer, wherein at least one of the core or cover layer comprises a plasticized polyurethane composition comprising at least one polyurethane and at least one plasticizer.