Fishing Rod Fitting Securing with Dual-Layer Thermosetting Resin
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Solution Overview
Problem
The existing methods for securing fittings like fishing line guides or reel seats on fishing rods using thermosetting resin-based prepreg sheets face instability due to resin flow variations during heat treatment, leading to poor durability and potential leakage, which affects the outer appearance.
Innovation Solution
A dual-layered securing method using prepreg sheets with different curing temperatures for the first and second sheet members, where the second sheet member with a lower curing temperature is wound over the first, stabilizing the securing portion by curing the outer resin first and preventing inner resin leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermosetting resin-based prepreg sheet is used to secure a fitting on a rod section, then the fitting can be secured through heat treatment, but resin flow variations occur during curing causing unstable securing position and poor durability
Solution Approach 1:
The patent divides the single prepreg sheet into two separate prepreg sheets (first and second). The first prepreg sheet is placed on the rod section surface, and the second prepreg sheet is placed on the fitting. This segmentation allows independent control of resin flow and curing for each sheet, preventing the resin position instability that occurs when using a single sheet.
Solution Approach 2:
The first prepreg sheet is placed and cured first before placing the second prepreg sheet. This preliminary action creates a stable base layer that prevents resin flow variations from affecting the final securing position. The sequential placement and curing process ensures that each layer is stabilized before the next is applied.
2Ease of manufacture
If a single prepreg sheet is used to secure the fitting, then the process is simple, but resin leakage occurs from the edge portion affecting outer appearance
Solution Approach 1:
By dividing the securing structure into two separate prepreg sheets, the patent controls resin containment more effectively. The first sheet on the rod section and the second sheet on the fitting create a contained resin system that prevents leakage from edges, while still maintaining a relatively simple two-step application process.
Solution Approach 2:
The first prepreg sheet acts as an intermediary layer between the rod section and the second prepreg sheet. This intermediate layer controls resin flow and prevents direct leakage from the fitting-rod interface, thereby eliminating the harmful resin leakage effect while maintaining manufacturing simplicity.
3Reliability
If thermosetting resin is heated to curing temperature, then the resin cures and secures the fitting, but resin flow variations cause unstable securing position
Solution Approach 1:
The patent segments the curing process into two separate heating stages corresponding to two separate prepreg sheets. Each sheet cures independently at its optimal temperature and time, eliminating the resin flow variations that occur when a single sheet is heated. This ensures precise positioning as each layer is stabilized before the next is applied.
Solution Approach 2:
The first prepreg sheet is cured in advance before the second sheet is applied. This preliminary curing action creates a stable, non-flowing base layer that precisely maintains the fitting's intended position. Subsequent heating of the second sheet does not cause position shifts because the first layer is already cured and stable.
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
This approach enhances the stability of the securing process, prevents resin leakage, and maintains the outer appearance of the fishing rod by controlling resin flow and curing temperatures, resulting in improved durability and secure fitting attachment.
Implementation Method 1
a thermosetting resin is used in consideration of a fact that it is soft in an uncured state and thus is easily processed (wound). Typically, a thermosetting resin in an uncured state is characterized in that a chemical reaction thereof is facilitated by heating, and when heated to a given temperature (a curing temperature), the thermosetting resin loses flowability and thus is cured
Data Source
AI summary
One object is to provide a fishing rod in which stability in securing a fitting is achieved. The fishing rod includes a molded rod section having a surface and the fitting placed on the surface, the fitting having a securing portion and being secured to the surface with a sheet member made of a thermosetting resin that is wound on the securing portion and heat-cured. The sheet member includes a first sheet member and a second sheet member made of thermosetting resins, the first sheet member being placed or wound on the rod section, the second sheet member being wound over the first sheet member and the securing portion placed on the first sheet member. The thermosetting resins of the first sheet member and the second sheet member have different curing temperatures from each other.