Monofilament String with Graphene Sheath for Racket
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Solution Overview
Problem
Monofilament strings for racket sports face challenges in achieving a balance between power, control, comfort, and durability, with existing solutions either compromising on power for durability or vice versa, and requiring high physical strength for effective ball acceleration and control.
Innovation Solution
A monofilament string design featuring a core made of polyamide with a sheath containing graphene or graphane nanoparticles, allowing for enhanced durability and maintaining power and control properties through a co-extrusion process, where the nanoparticles improve tensile strength and temperature resistance without excessive rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intermediate reinforcing layer made of composite material is added to increase durability, then durability is improved, but power properties are reduced due to reduced ability to bend at impact
Solution Approach 1:
The patent uses a composite material consisting of polyamide and graphene or graphane nanoparticles. The graphene or graphane nanoparticles (0.1-5% by weight) reinforce the polyamide matrix, providing enhanced durability and tensile strength while maintaining the material's flexibility and elasticity, thus resolving the contradiction between durability and power properties
Solution Approach 2:
The patent applies the composite material specifically in the sheath layer surrounding the core, rather than throughout the entire string structure. This localized application provides durability enhancement at the surface where wear occurs, while the core maintains its elasticity and bending ability for power properties
2Strength
If carbon nanotubes are added as an additive in wear-resistant coating, then wear resistance is improved, but the material becomes substantially rigidified and difficult to process
Solution Approach 1:
The patent changes the type of nanoparticle from carbon nanotubes to graphene or graphane nanoparticles, and optimizes the concentration to 0.1-5% by weight. This parameter change provides wear resistance while maintaining processability, as the planar structure of graphene and graphane at these concentrations does not substantially rigidify the polyamide matrix like carbon nanotubes would
3Measurement precision
If monofilament strings are made of polyethylene or polyester to achieve high stiffness and good control, then control is improved, but high physical strength is needed to accelerate the ball
Solution Approach 1:
The patent creates a composite material of polyamide with graphene or graphane nanoparticles that achieves high stiffness for control while maintaining sufficient elasticity for power. The nanocomposite structure provides enhanced mechanical properties that allow the string to be stiff for control yet responsive for ball acceleration without requiring high physical strength
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 string achieves improved durability and stability over time, maintaining mechanical properties and reducing tension loss, while allowing for efficient ball acceleration and control without high physical strength, and providing comfort by minimizing vibrations and friction.
Implementation Method 1
the sheath is made of a second material comprising at least a polyamide, wherein the second material is a polyamide matrix comprising graphene or graphane nanoparticles with a concentration ranging from 0.1% to 5% in weight
Implementation Method 2
the sheath is made of a second material comprising at least a polyamide, wherein the second material is a polyamide matrix comprising graphene or graphane nanoparticles
Implementation Method 3
allowing for enhanced durability and maintaining power and control properties through a co-extrusion process
Implementation Method 4
providing comfort by minimizing vibrations and friction
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a monofilament string (1) for a racket (5), comprising a core (2) consisting of a single filament and a sheath (3) extending around the core (2) and in contact with the core (2), wherein: - the core (2) is made of a first material comprising at least a polyamide, - the sheath (3) is made of a second material comprising at least a polyamide, wherein the second material comprises graphene or graphane nanoparticles with a concentration ranging from 0.1% to 5% in weight, preferably from 0.1% to 2% in weight, and more preferably from 0.1% to 1% in weight of the weight of the sheath.