Rotatable Roller Thread Deflection for Melt-Spinning Spacing
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Solution Overview
Problem
Existing devices for melt-spinning, drawing off, and winding threads face limitations in achieving uniformity of thread properties across different thread spacings and deflection angles, leading to potential changes in thread tensions and physical properties, especially when transitioning between large and small thread spacings.
Innovation Solution
The use of freely rotatable rollers forming two groups of thread guides, with the second group arranged orthogonally and offset above or below each other, allows for guiding threads without significant friction or slippage, enabling uniform thread spacing and maintaining consistent physical properties across the circumference of the godets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thread guides are used to deflect threads from large spacing to small spacing, then thread guidance is achieved, but thread tensions and physical properties change
Solution Approach 1:
A thread guide element with multiple rollers is introduced as an intermediary device between the spinning device and godet device. The threads pass between these rollers which are arranged to provide guidance while minimizing deflection angles, thereby reducing tension changes and maintaining uniform physical properties throughout the thread sheet.
Solution Approach 2:
The thread guidance system is segmented into multiple rollers arranged in specific patterns. Instead of using single deflection points, the threads are guided through multiple smaller deflection stages, with each roller handling a portion of the spacing reduction, thereby minimizing the overall impact on thread tension and physical properties.
2Productivity
If the number of spinnerets in a row is increased, then productivity is improved, but uniformity of thread properties deteriorates due to maximum deflection angle limitations
Solution Approach 1:
The thread guide element utilizes a two-dimensional arrangement of rollers rather than simple linear deflection. By arranging rollers in patterns that accommodate threads from multiple spinnerets, the system can handle increased thread counts while maintaining uniform deflection angles and consistent physical properties across all threads in the sheet.
3Area of stationary object
If threads are guided with narrow spacing, then compact design is achieved, but friction and slippage increase
Solution Approach 1:
Multiple rollers arranged in specific configurations serve as intermediary elements that distribute the guidance function. This arrangement allows threads to be maintained at narrow spacings while the rollers provide sufficient contact points to prevent slippage and maintain reliable guidance without excessive friction.
Data Source
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AI summary
The invention relates to a device for melt-spinning, drawing, and winding a thread group, comprising a spinning device. The spinning device has a row of a plurality of spinning nozzles, wherein the threads produced by the spinning nozzles are drawn by means of a godet device with multiple drivable godets. The device is paired with a winding device with multiple winding stations arranged in a row. The row of winding stations is arranged orthogonally to the row of spinning nozzles. The different thread spacings within the spinning device and the godet device are bridged by a thread deflecting device. For this purpose, the thread deflecting device has a first group of thread guides and a second group of thread guides. The thread guides of the first group are arranged next to one another in a horizontal row with a spinning spacing. The aim of the invention is to obtain the largest deflections possible with a low height. According to the invention, this is achieved in that the thread guides of the two groups of the thread guides are made of freely rotatable rollers.