Golf Club Face Polyurea Coating for Durability Without CT Loss
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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 limited durability when subjected to high-speed impacts, as existing face reinforcement structures compromise these measurements.
Innovation Solution
A method involving the application of a polymeric coating, specifically polyurea, to the rear surface of a golf club head with a variable thickness pattern, which includes affixing a guard fixture to protect the stiffening members and applying the coating to cure, ensuring it follows the contours of the face insert while maintaining a level rear surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If face reinforcement structures are added to improve durability, then the club head can withstand high-speed impacts better, but characteristic time (CT) and coefficient of restitution (COR) measurements deteriorate
Solution Approach 1:
The patent applies a polymer coating specifically to the rear surface of the club face where reinforcement is needed, rather than adding structural elements throughout the entire face. This localized application provides durability enhancement while preserving the original face geometry and performance characteristics in the impact zone.
Solution Approach 2:
The patent uses a composite structure combining the metal club face with a polymer coating layer. This composite approach provides the benefits of both materials: the metal provides structural integrity and impact resistance, while the polymer coating adds durability and can be formulated to maintain or enhance CT and COR measurements.
2Reliability
If a polymer coating is applied to the rear surface of the face, then durability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent incorporates the polymer coating application as an integral step in the manufacturing process, performing the coating application while the club head is in a predetermined state (with stiffening members in place). This preliminary action simplifies the overall process by combining multiple operations into a coordinated sequence rather than adding separate post-processing steps.
Solution Approach 2:
The patent uses stiffening members as intermediary elements that serve dual purposes: providing structural reinforcement during the coating application process and acting as masks to define the coating application area. These intermediaries simplify the manufacturing process by eliminating the need for separate masking steps.
3Manufacturing precision
If the coating is applied to follow the contours of the variable thickness pattern, then manufacturing precision is maintained, but the application process becomes more difficult
Solution Approach 1:
The patent employs a coating application method where the coating material automatically follows the contours of the variable thickness face pattern through gravity and capillary action. The coating process self-adjusts to the face geometry without requiring complex application equipment or manual intervention to maintain contour alignment.
Solution Approach 2:
The patent combines the coating application process with the stiffening member installation process. The stiffening members serve as both structural elements and application guides, merging two functions into a single integrated step that simplifies the overall manufacturing process while maintaining precision.
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 polyurea coating enhances the durability of the golf club head, increasing its lifespan by 32% to 169% and fine-tuning CT and COR measurements, while reducing weight and improving impact mitigation properties.
Implementation Method 1
applying a coating to at least a portion of the interior-facing surface of the face wall, allowing the coating to cure
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.