Rear-Face Polyurea Coating for Variable-Thickness Golf Club Faces
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Solution Overview
Problem
Golf club heads experience reduced performance metrics such as characteristic time (CT) and coefficient of restitution (COR) due to the durability limitations of existing face reinforcement structures, which are unable to withstand high swing speeds effectively.
Innovation Solution
A method involving the application of a polymeric material, specifically polyurea, to at least a portion of the rear surface of a golf club head with a variable face thickness pattern, enhancing durability and maintaining desirable CT and COR measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art face reinforcement structures are used, then durability is improved, but characteristic time (CT) and coefficient of restitution (COR) are reduced
Solution Approach 1:
The patent applies a polymer coating specifically to the rear face surface of the club head, creating a localized reinforcement layer that provides durability enhancement without requiring structural modifications to the entire club head. This localized approach allows the face to maintain its original impact properties while gaining protective benefits in specific areas.
Solution Approach 2:
The patent combines the metal club head with a polymer coating material to create a composite structure. The polymer layer works synergistically with the metal face to provide both durability and performance characteristics, leveraging the strengths of different materials to resolve the contradiction between durability and rebound efficiency.
2Reliability
If prior art face reinforcement structures are used, then durability is improved, but characteristic time (CT) is reduced
Solution Approach 1:
The polymer coating is applied locally to the rear face surface, providing durability enhancement only where needed for protection, while leaving the rest of the face structure unchanged to maintain optimal characteristic time for ball impact and energy transfer.
Solution Approach 2:
The polymer coating is applied in advance to the rear face surface to provide protective reinforcement before the club head is used. This preliminary protective layer prevents damage accumulation that would otherwise reduce characteristic time over the club's lifespan, thereby maintaining consistent performance duration.
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 application of polyurea coating improves the durability of the golf club head, increasing its lifespan by 32 to 169 hits compared to non-coated heads, while maintaining or slightly adjusting CT and COR values, thus enhancing overall performance.
Implementation Method 1
Golf club heads swung at high speeds experience increased forces placed on their striking faces from high-speed impacts
Implementation Method 2
maintaining desirable CT and COR measurements
Data Source
AI summary
Methods of applying a polymeric coating to a rear face surface of golf club heads with variable face thickness are disclosed herein. The coating, which preferably comprises polyurea, improves the durability of the face and reduces the hits to failure ratio of the golf club head. The coating improves the performance of the golf club head because it allows for reduction in overall face thickness and easy post-process manipulation to allow for fine-tuning of mass properties after production. The reduction in thickness leads to overall weight reduction, because the polymer is roughly a quarter of the density of titanium or stainless steel, and also reinforces the face, thereby increasing the lifespan of the club.