Spun Yarn Drawing Apparatus Roller Speed and Temperature Control
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Solution Overview
Problem
Existing spun yarn drawing apparatuses have limitations in controlling the range of physical properties of yarns, primarily due to reliance on yarn feeding speed adjustments of second rollers alone, which restricts the extent of tension and heat treatment effects.
Innovation Solution
A method utilizing a spun yarn drawing apparatus with multiple heating rollers, where yarn feeding speeds and temperatures are independently controlled to enhance relaxation heat treatment and heat treatment under tension, allowing for a wider range of physical property control by optimizing the tension and heat distribution along the yarn path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If yarn feeding speeds of second rollers are adjusted to control physical properties, then tension control during heat-set process is improved, but the range of control of physical properties is limited
Solution Approach 1:
The patent applies parameter changes by independently controlling both the yarn feeding speeds and temperatures of multiple second rollers. This allows simultaneous adjustment of mechanical tension (via speed differential) and thermal treatment (via temperature gradients), thereby expanding the controllable range of yarn physical properties such as boiling water shrinkage and Young's modulus beyond what speed adjustment alone can achieve.
Solution Approach 2:
The patent implements dynamics by making the feeding speeds and temperatures of the second rollers independently adjustable and variable. The speed controller and temperature controller enable dynamic optimization of the heat-set process parameters based on desired yarn properties, allowing the system to adapt to different production requirements and expand the range of controllable physical properties.
2Stability of the object's composition
If yarn feeding speed of downstream second roller is lower than upstream roller, then relaxation heat treatment is achieved, but molecular chain relaxation may be insufficient without adequate temperature
Solution Approach 1:
The patent applies parameter changes by implementing a temperature gradient across the second rollers, where the downstream roller has a higher temperature than the upstream roller. This temperature differential, combined with the speed differential, creates optimal conditions for molecular chain relaxation by providing both mechanical loosening (through tension reduction) and thermal activation (through increased temperature), thereby achieving more effective relaxation heat treatment.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining a sequence of heat treatment zones with progressively increasing temperatures. The yarn passes through multiple second rollers with escalating temperatures, ensuring continuous and cumulative molecular chain relaxation throughout the heat-set process, rather than relying on a single temperature zone.
3Productivity
If multiple second rollers with different speeds are used, then heat treatment under tension or relaxation is achieved, but energy distribution and heating efficiency may be suboptimal
Solution Approach 1:
The patent applies parameter changes by independently controlling the temperature of each second roller to create an optimized temperature distribution pattern. The downstream roller operates at a higher temperature to maximize molecular chain mobility and relaxation effectiveness, while upstream rollers operate at lower temperatures. This gradient distribution optimizes energy utilization by concentrating thermal energy where it is most needed for achieving the desired physical properties.
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 enables a broader control over yarn physical properties, including reduced boiling water shrinkage and increased Young's modulus, by effectively relaxing molecular chains and preventing unnecessary heating, thus improving the quality and versatility of the yarns produced.
Implementation Method 1
a plurality of second rollers which are provided downstream of the first roller in a yarn running direction. Each second roller has a yarn feeding speed higher than that of the first roller, and functions as a heating roller.
Implementation Method 2
the yarn feeding speed of the second roller located downstream in the yarn running direction is lower than that of the second roller located upstream in the yarn running direction, to perform relaxation heat treatment in which the yarns are heat-set in a relaxed state.
Data Source
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AI summary
An object of the present invention is to enable a wider range of control of physical properties of yarns. When relaxation heat treatment is performed, yarn feeding speeds of second godet rollers 22a, 22b, and 22c are controlled so that between every two second godet rollers which are adjacent to each other in a yarn running direction, the yarn feeding speed of the second godet roller located downstream in the yarn running direction is lower than the second godet roller located upstream in the yarn running direction, and temperatures of the second godet rollers 22a, 22b, and 22c are controlled so that the temperature of the heating roller 22c located most downstream in the yarn running direction is higher than or equal to the temperature of each of the remaining heating rollers 22a and 22b. When heat treatment under tension is performed, the yarn feeding speeds of the second godet rollers 22a, 22b, and 22c are controlled so that between every two second godet rollers which are adjacent to each other in the yarn running direction, the yarn feeding speed of the second godet roller located downstream in the yarn running direction is higher than the second godet roller located upstream in the yarn running direction, and the temperatures of the second godet rollers 22a, 22b, and 22c are controlled so that the temperature of the heating roller 22a located most upstream in the yarn running direction is higher than or equal to the temperature of each of the remaining heating rollers 22b and 22c.