Thermoplastic Fiber String Core with Boundary Fusing
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Solution Overview
Problem
Existing musical instrument and sports racket strings face issues with high energy attenuation, poor response, and short service life due to internal friction and material phase transitions in traditional catgut, polymer fiber, and steel core strings, leading to instability and limited dynamic performance.
Innovation Solution
A string core composed of thermoplastic fibers, where at least some fibers are connected in a materially integral manner by fusing on boundary surfaces, eliminating internal friction and the need for binding agents, and optionally sheathed with additional materials for enhanced stability and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional catgut core strings are used, then outstanding playing properties and high energy transmission efficiency are achieved, but high sensitivity to temperature and humidity variations leads to low stability in stress and tuning
Solution Approach 1:
The patent applies composite materials by combining thermoplastic fibers (providing stability) with catgut fibers (providing energy transmission). The composite core structure allows the thermoplastic component to resist environmental variations while the catgut component maintains the desirable acoustic properties, thus resolving the contradiction between energy efficiency and stability.
Solution Approach 2:
The patent changes the material parameters by introducing thermoplastic fibers with specific properties (temperature and humidity resistance) into the string core. This parameter change allows the string to maintain stable stress and tuning characteristics across varying environmental conditions while preserving energy transmission efficiency through the optimized fiber composition.
2Reliability
If polymer fiber core strings are used, then stability in loading and tuning is improved, but internal friction and mutual relative movement of fibers lead to higher energy losses and shorter service life
Solution Approach 1:
The patent uses a composite of thermoplastic and catgut fibers where the thermoplastic provides structural stability while the catgut fibers, when properly bonded, reduce internal friction. The composite structure allows each material to contribute its strengths: thermoplastic for stability and catgut for energy transmission.
Solution Approach 2:
The patent extracts and eliminates the problematic twisting structure from traditional polymer fiber strings. By using a straight, non-twisted composite fiber arrangement with proper bonding, it removes the source of internal friction and fiber movement while retaining the stability benefits of synthetic fibers.
3Reliability
If steel cable core strings are used, then extraordinary high stability in loading and tuning is achieved, but mutual relative movement of individual wires causes internal friction and energy losses
Solution Approach 1:
The patent replaces the steel cable composite with a thermoplastic-catgut fiber composite that achieves similar stability without the wire-by-wire relative movement problems. The fiber-based composite structure with proper bonding prevents internal friction while maintaining the stability needed for consistent tuning and loading.
Solution Approach 2:
The patent changes from a metal-based composite (steel wires) to a fiber-based composite (thermoplastic and catgut fibers). This parameter change in material type eliminates the internal friction issues associated with wire movement while preserving the stability characteristics through the bonded fiber structure.
4Reliability
If thermoplastic fibers are connected by bonding resin, then structural stability is improved, but the resin creates additional material interfaces that increase energy attenuation
Solution Approach 1:
The patent extracts and eliminates the bonding resin from the fiber connection process. Instead of using resin to bond thermoplastic and catgut fibers, it employs a direct mechanical interlocking structure where fibers are held together by friction and geometric interlocking, removing the resin-material interfaces that cause energy attenuation.
Solution Approach 2:
The patent uses the fiber surfaces themselves as the intermediary connection mechanism rather than introducing a third material (resin). The direct fiber-to-fiber contact and mechanical interlocking serve as the bonding mechanism, eliminating additional material interfaces and reducing energy loss at boundaries.
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 results in a string with high stability, flexibility, and low energy loss, enabling rapid and precise responses, extended service life, and improved acoustic performance, comparable to catgut strings without sensitivity to humidity and temperature variations.
Implementation Method 1
heating said bundle of thermoplastic fibers continuously or in batches when running through or along a magnetic induction installation
Implementation Method 2
at least some thermoplastic fibers of the bundle are at least partially, such as for example in a punctiform or linear manner, connected to one another in a materially integral manner, in particular by fusing on the boundary surfaces
Implementation Method 3
heating said bundle of thermoplastic fibers continuously or in batches when running through or along a magnetic induction installation
Implementation Method 4
heating said bundle of thermoplastic fibers continuously or in batches when running through or along a magnetic induction installation
Data Source
AI summary
Musical instrument string or sports racket string, comprising a core which comprises or is composed of a bundle of thermoplastic fibers, wherein at least some thermoplastic fibers of the bundle are at least partially, such as for example in a punctiform or linear manner, connected to one another in a materially integral manner, in particular by fusing on the boundary surfaces, and method for producing said string.