CNT Yarn Thickness Control via Feedback Sensor
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Solution Overview
Problem
The performance of drawing carbon nanotube fibers varies with speed, necessitating the monitoring of carbon nanotube yarn production state in yarn producing apparatuses to ensure consistent quality.
Innovation Solution
A yarn producing apparatus equipped with a drawing unit, yarn producing unit, and a status monitor that includes a yarn thickness detecting sensor to monitor and control the thickness of carbon nanotube yarn, allowing for real-time adjustments in drawing speed and substrate count to maintain uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drawing speed of carbon nanotube fibers is increased to improve productivity, then the production efficiency is improved, but the thickness uniformity of the carbon nanotube yarn deteriorates
Solution Approach 1:
The patent implements a feedback control system where a thickness detecting sensor continuously monitors the thickness of the carbon nanotube yarn during production. The detected thickness information is fed back to the control unit, which automatically adjusts the drawing speed to maintain uniform thickness. This closed-loop feedback mechanism resolves the contradiction by enabling high-speed production while maintaining precision through real-time correction.
Solution Approach 2:
The patent employs dynamic adjustment of the drawing speed based on real-time thickness measurements. Instead of operating at a fixed speed, the drawing unit's speed is dynamically modified according to the actual production conditions and thickness requirements. This dynamic control allows the system to adapt to variations in material properties and maintain consistent yarn quality even at high production rates.
2Manufacturing precision
If the drawing speed is reduced to maintain thickness uniformity, then the manufacturing precision is improved, but the productivity decreases
Solution Approach 1:
The feedback control system continuously monitors yarn thickness and automatically adjusts drawing speed to maintain uniformity. This eliminates the need to operate at reduced speeds solely for quality control, as the system can maintain high speed while correcting thickness variations in real-time through the feedback loop.
Solution Approach 2:
The patent changes the drawing speed parameter dynamically based on detected thickness variations. When non-uniformity is detected, the system modifies the speed parameter to correct the issue, then returns to higher speeds when quality is acceptable. This parameter adjustment strategy maintains both high productivity and consistent quality.
3Manufacturing precision
If real-time monitoring of carbon nanotube yarn thickness is implemented, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement and adjustment systems with optical or electromagnetic sensing technology. The thickness detecting sensor uses non-contact measurement methods (such as optical detection) to monitor yarn thickness, and the control unit uses electronic feedback to adjust drawing speed, eliminating the need for complex mechanical gauges and manual adjustment mechanisms.
4Productivity
If the number of carbon nanotube forming substrates is increased to improve productivity, then the production efficiency is improved, but the difficulty of detecting and measuring thickness increases
Solution Approach 1:
The patent implements a universal thickness detection system that can measure the combined yarn thickness regardless of how many substrates are being drawn from. The detecting sensor is designed to handle varying numbers of substrates and corresponding yarn configurations, providing consistent thickness measurement and control functionality across different production scales.
Data Source
AI summary
A yarn producing apparatus for producing carbon nanotube (CNT) yarn by aggregating CNT fibers. A front roller continuously draws the CNT fibers from at least one CNT forming substrate, a yarn producing unit aggregates the CNT fibers drawn by the front roller, and a status monitors a state of the CNT fibers drawn from the CNT forming substrate, or the CNT yarn.