Combed Sliver Mass Control via Feedback Draft Adjustment
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Solution Overview
Problem
Existing textile production processes for combed fiber bands face challenges in maintaining a constant fiber mass, particularly at the beginning and end of the cotton wrap, due to high initial wadding weights and the need for complex and costly stretching plants.
Innovation Solution
A system and procedure that utilize a measuring device on the combing machine to monitor the tape mass of the fiber band, adjust the winding length of the cotton wrap, and optimize the delay and tension on the wrap machine, allowing for a constant fiber mass production with simpler and cheaper stretching plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individually driven drafting rollers are installed in each combing machine to correct weight fluctuations, then manufacturing precision of sliver weight is improved, but device complexity and investment costs increase
Solution Approach 1:
The invention implements a feedback control system where the actual sliver weight is measured during production, compared with the target weight, and the deviation is used to adjust drafting parameters. The control system determines the deviation in sliver mass, compares it with a target value, and uses this data to adjust drafting and tension parameters, creating a closed-loop control that maintains weight consistency without complex mechanical modifications
Solution Approach 2:
The invention changes operational parameters (drafting ratio and tension) based on measured sliver weight deviations. By dynamically adjusting these parameters according to actual production conditions and measured deviations, the system achieves consistent sliver weight without requiring complex individually driven rollers at each combing machine
2Manufacturing precision
If complex stretching plants are used to correct weight deviations at beginning and end of lap roll, then manufacturing precision is improved, but device complexity and investment costs increase
Solution Approach 1:
The invention performs preliminary action by adjusting drafting and tension parameters before weight deviations occur. The system identifies the position (beginning/middle/end of lap) and proactively adjusts parameters to prevent weight fluctuations, rather than using complex stretching plants to correct deviations after they occur
Solution Approach 2:
The control system continuously measures sliver weight and uses this feedback to adjust drafting parameters in real-time, preventing weight deviations at the beginning and end of laps without requiring complex corrective stretching equipment
3Manufacturing precision
If multiple individually driven drafting rollers are installed in combing machines, then sliver weight consistency is improved, but energy consumption increases
Solution Approach 1:
The system uses feedback control to adjust drafting parameters based on actual sliver weight measurements, achieving consistent weight output without the continuous high energy consumption of multiple individually driven rollers operating at full capacity
Solution Approach 2:
The invention changes drafting and tension parameters dynamically based on measured deviations, allowing the system to achieve precision with variable parameter adjustment rather than constant high-energy operation of multiple driven rollers
Data Source
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AI summary
The invention relates to a method and a system for producing a combed fiber strip (F), comprising a winding machine (W) with at least one combing machine, wherein the winding machine (W) produces a group of multiple lap rolls (1) from a lap strip (4) for each combing machine, said lap rolls being transported to the combing machine and provided to combing heads (20), and a combed fiber strip is produced from each lap roll (1), said fiber strip(s) then being stretched into a single fiber strip (F). The invention is characterized in that the deviation of the strip mass of the fiber strip (F) is measured, compared with the target strip weight, and assigned to the discharge length of the lap roll (1), and the draft and/or the tension on the winding machine (W) is adjusted over the winding length for the next group of lap rolls (1) using said data.