Golf Ball Coating Film Uniformity on Dimple Edges
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Solution Overview
Problem
Conventional golf ball coating materials with high elastic work recovery rates are brittle and prone to peeling, especially when the coating film is thick, leading to inadequate scratch and peeling resistance, particularly on dimpled surfaces where uniform film thickness is difficult to achieve.
Innovation Solution
A method involving a layered coating structure with a first coating film made of an acrylic and urethane resin composition and a second coating film containing polyurethane material and a solvent with a boiling point of 80°C or less, applied in a spray coating process to ensure a film thickness of 10 μm or more at the dimple edges, enhancing both scratch and peeling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the coating film is increased to improve scratch resistance and peeling resistance, then both scratch resistance and peeling resistance are improved, but it becomes difficult to uniformly form a thick coating film on surfaces with recessed curved surfaces such as dimples
Solution Approach 1:
The coating film is divided into multiple layers with different functions: a first coating film (inner layer) providing adhesion and a second coating film (outer layer) providing scratch resistance. This segmentation allows each layer to be optimized independently for its specific function while achieving uniform thickness distribution across the dimpled surface.
Solution Approach 2:
The patent changes the material composition parameters of the coating films, specifically using a first coating material composition containing acrylic resin and urethane resin, and a second coating material composition containing polyurethane coating material. This parameter change enables the coating to achieve both uniform thickness and high scratch resistance.
2Strength
If a coating material composition with high elastic work recovery rate is used to form a coating film with high scratch resistance, then scratch resistance is improved, but the coating film becomes more brittle and easily peels from the covering
Solution Approach 1:
The coating is segmented into two functional layers: the first coating film uses acrylic resin and urethane resin to provide strong adhesion to the covering, while the second coating film uses polyurethane coating material with high elastic work recovery rate to provide scratch resistance. This segmentation resolves the contradiction by assigning different material properties to different layers.
Solution Approach 2:
The patent employs composite material structures where the first coating film combines acrylic resin and urethane resin for adhesion, and the second coating film uses polyurethane coating material for scratch resistance. This composite approach allows the coating system to simultaneously achieve both adhesion and scratch resistance.
3Strength
If the film thickness in the edge portion of dimples is increased to improve scratch resistance, then scratch resistance is improved, but aerodynamic performance deteriorates
Solution Approach 1:
The patent applies different coating thicknesses to different regions of the golf ball surface. The second coating film achieves a thickness of 10 μm or more in the edge portion of dimples for scratch resistance, while maintaining appropriate thickness in other areas to preserve aerodynamic performance. This local quality approach optimizes both requirements.
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 method allows for a uniformly thick coating on dimpled surfaces, significantly improving scratch and peeling resistance while maintaining aerodynamic performance, as evidenced by high elastic recovery rates and edge ratios in sand and sand/water abrasion tests.
Implementation Method 1
a second coating film containing a polyurethane coating material and a solvent having a boiling point of 80° C. or less
Data Source
AI summary
A method for producing a golf ball of the present invention includes the steps of: forming a first coating film on a surface of a covering having a plurality of dimples; and forming a second coating film on a surface of the first coating film. The second coating film is formed of a second coating material composition containing a polyurethane coating material and a solvent having a boiling point of 80° C. or less. An elastic recovery rate of the second coating film is 50% or more. In the golf ball of the present invention obtained by the method, an edge ratio which is a ratio of a film thickness of the second coating film in an edge portion of the dimple to a film thickness of the second coating film in a central portion of the dimple is 50% or more.