High-Elasticity Nylon Tire Cord Through Moisture-Controlled Drying
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Solution Overview
Problem
Nylon tire cords face challenges in maintaining high elastic modulus due to moisture sensitivity, leading to decreased elastic modulus and increased yarn breakages when attempting to improve properties through increased draw ratios or high-temperature stretching.
Innovation Solution
A method involving the production of a nylon cord with controlled moisture content by drying the raw cord at temperatures between 150°C to 240°C for 100 to 300 seconds, resulting in a cord with a load at 2% elongation of 0.6 to 1.2 g/d and a shrinkage rate of less than 6%, measured under a primary load of 0.05 g/d at 177°C for 2 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the draw ratio is increased during yarn production to improve elastic modulus, then the elastic modulus of the nylon cord is improved, but the yarn breakage rate increases and processability is lowered
Solution Approach 1:
The invention changes the moisture content parameter of the nylon yarn from conventional high levels (8-12%) to a controlled low level (2-5%) before cord production. This parameter change allows the cord to achieve high elastic modulus without requiring excessive draw ratios, thereby reducing yarn breakage and improving processability while maintaining the desired mechanical properties.
2Strength
If high temperature (over 250°C) and stretch are applied during cord production to improve elastic modulus, then the elastic modulus is improved, but the cord becomes hard and fatigue resistance is lowered
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperatures (>250°C) to a moderate temperature range (20-100°C) during cord production. Combined with controlled moisture content (2-5%), this allows achieving high elastic modulus through gentle stretching without causing cord hardening, thereby maintaining both elastic modulus and fatigue resistance.
3Strength
If the moisture content of nylon is high, then the fiber shrinks and elastic modulus decreases, but reducing moisture content through conventional means is not sufficient to prevent shrinkage at high temperatures
Solution Approach 1:
The invention performs preliminary moisture control by adjusting and maintaining the yarn moisture content to a specific low range (2-5%) before the cord production process. This preliminary action prevents moisture-related shrinkage during subsequent high-temperature cord production, ensuring dimensional stability and high elastic modulus without requiring excessive draw ratios or temperatures.
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 effectively enhances the elastic modulus of the tire cord while maintaining tensile properties, reducing yarn breakages and improving fatigue resistance without increasing the draw ratio or applying high temperatures during production.
Implementation Method 1
drying the raw cord; the drying of the raw cord may be performed by drying the raw cord at a temperature of equal to or greater than 150° C. for equal to or greater than 100 seconds
Implementation Method 2
drying the raw cord at a temperature of equal to or greater than 150° C. for equal to or greater than 100 seconds; drying and heat-treating the raw cord
Data Source
AI summary
The present invention pertains to a high-elasticity nylon cord and a method for producing same. The purpose of the present invention is to produce a nylon cord having a high elastic modulus by reducing the moisture content of a raw cord through a drying process during the production of the nylon cord.