PET Partially Oriented Yarn for High-Speed False-Twist Stability
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Solution Overview
Problem
Existing methods for manufacturing false-twisted processed yarns face challenges in achieving high production efficiency due to surging issues when the yarn running speed exceeds the maximum speed, particularly when using partially oriented yarns with low pre-processing elongation and boiling water shrinkage.
Innovation Solution
The method involves using partially oriented yarns with specific properties, including pre-processing elongation of 80% or more, boiling water shrinkage of 3.7% to 10%, and strength of 2.9 cN/dtex or more, to suppress surging and increase the maximum production speed to 1100 m/min or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processing speed is increased to improve productivity, then production efficiency is improved, but surging occurs and false twisting cannot be properly performed
Solution Approach 1:
The invention changes the physical parameters of the raw yarn by controlling its pre-processing elongation to be less than 100% and boiling water shrinkage to be 3.7% to 25%. These parameter changes allow the yarn to maintain stability at high processing speeds (1100 m/min or more) without surging, thus resolving the contradiction between productivity improvement and false twisting quality
Solution Approach 2:
The invention performs preliminary preparation of the raw yarn by controlling its pre-processing elongation and crystallization state before false twisting. This preliminary action ensures that the yarn has the appropriate mechanical properties to withstand high-speed processing without surging, enabling both high productivity and quality false twisting
2Speed
If the processing speed is increased beyond maximum speed, then production efficiency is improved, but the yarn starts to vibrate and surging occurs
Solution Approach 1:
The invention modifies the yarn's physical parameters by controlling pre-processing elongation to be less than 100% and boiling water shrinkage to be 3.7% to 25%. These changes increase the yarn's resistance to vibration and surging, allowing stable operation at processing speeds of 1100 m/min or more without exceeding the traditional maximum speed limit
Solution Approach 2:
The invention prepares the yarn in advance by controlling its pre-processing elongation and crystallization state, creating a cushioning effect that absorbs the destabilizing forces at high speeds. This preliminary preparation prevents vibration and surging before they can occur, maintaining yarn stability at processing speeds beyond the conventional maximum
3Stability of the object's composition
If the pre-processing elongation is low to suppress surging, then yarn stability is improved, but manufacturing complexity increases
Solution Approach 1:
The invention achieves yarn stability by controlling the pre-processing elongation parameter to be less than 100% and boiling water shrinkage to be 3.7% to 25%. These parameter changes are implemented through standard spinning and heat treatment processes, maintaining manufacturing simplicity while achieving the desired yarn stability for high-speed false twisting
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 effectively suppresses surging and yarn breakage, allowing for high-speed production of false-twisted processed yarns with improved efficiency and quality.
Implementation Method 1
a heater configured to heat the raw yarn
Implementation Method 2
a drawing device configured to draw the raw yarn heated by the heater
Implementation Method 3
a false-twisting device which is provided downstream of the heater in a yarn running direction and which is configured to false-twist the raw yarn
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An object of the present invention is to increase the maximum speed at which a false-twisted processed yarn can be produced. In a method of manufacturing the false-twisted processed yarn Yf by using a false-twist texturing machine 1, a raw yarn Yr is a partially oriented yarn formed of PET synthetic fibers. When the partially oriented yarn is not false-twisted, the partially oriented yarn has a pre-processing elongation of less than 100%, a boiling water shrinkage of 3.7% to 25%, and a strength of 2.9 cN/dtex or more. In this regard, the pre-processing elongation is the residual elongation. Furthermore, the raw yarn Yr is false-twisted at a processing speed of 1100 m/min or more while being heated and drawn.