Polyacetal Stretched Fiber Processability and Strength
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Solution Overview
Problem
Polyacetal resin fibers face challenges in achieving practical tensile strength and processability during stretching, with existing methods resulting in fibers that do not meet requirements for sliding properties and mechanical strength.
Innovation Solution
A polyacetal stretched fiber is produced by melt spinning a polyacetal resin composition containing a fatty acid metal salt, which is then stretched at a temperature of 100°C or more but below the melting point, allowing for high processability and improved mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyacetal resin is processed into fiber by conventional methods, then the fiber can be produced, but the fiber lacks practical tensile strength and has poor processability during stretching
Solution Approach 1:
The patent applies parameter changes by precisely controlling the stretching temperature to be 100°C or more but below the melting point of the polyacetal resin, and by controlling the fatty acid metal salt content at 0.5 to 5 phr. These parameter optimizations enable simultaneous achievement of practical tensile strength and excellent processability during stretching, resolving the technical contradiction between strength and ease of manufacture.
2Object-generated harmful factors
If polyacetal resin fiber is produced to achieve sliding properties, then sliding property is improved, but mechanical strength becomes insufficient
Solution Approach 1:
The patent optimizes the fatty acid metal salt content parameter at 0.5 to 5 phr and controls the stretching temperature parameter to achieve a balance where the fiber maintains excellent sliding properties comparable to bulk polyacetal resin while also achieving practical tensile strength, resolving the contradiction between sliding property and mechanical strength.
3Object-generated harmful factors
If fluororesin is used to improve sliding property, then sliding property is enhanced, but cost increases and mechanical strength remains insufficient due to low molecular chain orientation
Solution Approach 1:
The patent replaces expensive fluororesin with polyacetal resin, achieving comparable sliding properties at lower cost. By optimizing the polyacetal resin composition with fatty acid metal salt and controlling stretching parameters, the patent enables the polyacetal fiber to achieve both practical tensile strength and excellent sliding properties, eliminating the need for costly fluororesin while maintaining performance.
Solution Approach 2:
The patent changes the material parameter from fluororesin to polyacetal resin with optimized composition (0.5-5 phr fatty acid metal salt) and optimized processing parameters (stretching temperature 100°C or more but below melting point), achieving both practical tensile strength and excellent sliding properties at lower cost.
4Ease of manufacture
If polyacetal resin is stretched at high temperature to improve processability, then processability is improved, but tensile strength decreases
Solution Approach 1:
The patent optimizes the stretching temperature parameter to be 100°C or more but below the melting point of the polyacetal resin, and controls the fatty acid metal salt content at 0.5 to 5 phr. This optimized parameter combination enables excellent processability during stretching while maintaining practical tensile strength, resolving the contradiction between ease of manufacture and 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 resulting polyacetal stretched fiber exhibits excellent tensile strength, sliding properties, and processability, making it suitable for applications requiring high tension and low friction, while maintaining surface smoothness.
Implementation Method 1
melt spinning the polyacetal resin composition
Implementation Method 2
stretching a fiber at a temperature which is 100°C or more to a temperature lower than the melting point
Data Source
AI summary
The present invention is directed to a polyacetal stretched fiber of a polyacetal resin composition which contains a polyacetal resin and a fatty acid metal salt in an amount of 0.01 to 5 phr relative to the polyacetal resin, wherein the stretched fiber is obtained by stretching a fiber at a temperature of 100°C or more to a temperature lower than the melting point of a polyacetal resin composition, and the fiber is obtained by melt spinning the polyacetal resin composition, and a fiber assembly comprising the stretched fiber as a main constituent.