Golf Shaft Adhesive Layer for Plated Steel Tube Bonding
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Solution Overview
Problem
Existing golf shafts with a steel element tube and a fiber reinforced plastic outer layer face poor adhesion issues due to lack of surface lapping, increasing manufacturing complexity and process requirements.
Innovation Solution
A golf shaft design incorporating a steel element tube with a plating layer, an adhesive layer composed of epoxy resin or carbon nano tube resin between the plating layer and the fiber reinforced plastic outer layer, using a mixed curing agent and dispersed carbon nano tubes to enhance adhesion without surface lapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plating is applied to the element tube for rust prevention, then corrosion resistance is improved, but adhesion of the outer layer to the element tube deteriorates
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the plating layer and the outer layer. This adhesive layer specifically addresses the adhesion problem caused by the plating surface while maintaining the corrosion resistance benefits of the plating. The adhesive layer chemically or mechanically bonds to both the plating layer and the outer layer, creating a reliable interface that overcomes the poor adhesion inherent to plated surfaces.
2Strength
If a nonwoven fabric inner layer is interposed between the element tube and outer layer to improve adhesion, then adhesion is improved, but manufacturing complexity increases due to additional lapping processes
Solution Approach 1:
The adhesive layer serves as a mediator that enables direct bonding between the plating layer and outer layer without requiring intermediate nonwoven fabric layers or surface lapping processes. This simplifies the manufacturing process while achieving the desired adhesion strength.
Solution Approach 2:
The invention changes the chemical parameters of the bonding interface by using an adhesive layer with specific chemical composition and curing characteristics. This allows bonding to occur directly on the plated surface without mechanical preparation, eliminating the need for lapping processes and reducing manufacturing complexity.
3Weight of moving object
If the element tube wall thickness is thinned to reduce weight, then weight is reduced, but structural strength deteriorates
Solution Approach 1:
The invention uses a composite structure consisting of a steel element tube with thinned wall for weight reduction, a corrosion-resistant plating layer, and an outer protective layer with adhesive bonding. This composite construction allows the thin-walled tube to maintain sufficient structural strength through the combined properties of multiple materials and layers, achieving weight reduction without sacrificing structural integrity.
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 ensures sufficient adhesion between the outer layer and the element tube, reducing manufacturing complexity and achieving weight reduction while maintaining the structural properties of a steel golf shaft.
Implementation Method 1
an adhesive layer interposed between the plating layer and the outer layer to bond between the plating layer and the outer layer
Implementation Method 2
the adhesive layer is an epoxy resin composition or a carbon nano tube resin composition, the epoxy resin composition comprising an epoxy resin and a mixed curing agent in which two or more kinds of amine-based curing agents are mixed
Implementation Method 3
the carbon nano tube resin composition comprising an epoxy resin and at least one kind of curing agents as well as dispersed carbon nano tubes
Data Source
AI summary
Provided is a golf shaft comprising an element tube made of steel, a plating layer formed on an outer periphery of the element tube, an outer layer covering the plating layer, an adhesive layer interposed between the plating layer and the outer layer to bond between the plating layer and the outer layer. The outer layer is formed of a fiber reinforced plastic having a matrix resin that is an epoxy resin, and the adhesive layer is an epoxy resin composition or a carbon nano tube resin composition, the epoxy resin composition comprising an epoxy resin and a mixed curing agent in which two or more kinds of amine-based curing agents are mixed, and the carbon nano tube resin composition comprising an epoxy resin and at least one kind of curing agents as well as dispersed carbon nano tubes.