Multi-Feed Air Spinning With Split Rollers for Direct Web Blending
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Solution Overview
Problem
Conventional air-jet spinning processes for producing yarns from multiple fiber webs are costly and inefficient, requiring additional processing steps, fiber contamination prevention, and machine recalibration, and cannot handle carded cotton due to short fiber lengths and low homogeneity.
Innovation Solution
A drawing method and apparatus for air spinning machines with multiple feeds, utilizing split drive rollers to independently control the drawing speed of each web, allowing simultaneous blending of separate webs within an air spinning chamber using tangential air jets, eliminating the need for intermediate cleaning and machine recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple fiber webs are blended using conventional processes with repeated drawing, then good blending quality is achieved, but processing time and costs increase significantly
Solution Approach 1:
The invention segments the blending process by keeping multiple fiber webs separate throughout the drawing operation. Each web is drawn independently through its own set of drawing rollers and fed separately into the air spinning chamber, eliminating the need for repeated blending cycles while maintaining quality
Solution Approach 2:
The invention uses air jets (pneumatics) to transport and blend the separately drawn webs within the air spinning chamber. This pneumatic blending approach achieves homogeneous mixing without requiring mechanical reprocessing cycles, significantly reducing processing time
2Manufacturing precision
If blended webs are processed through a single introducer tube, then blending is achieved, but fiber contamination occurs requiring cleaning operations
Solution Approach 1:
The invention uses separate introducer tubes for each fiber web, keeping them physically segregated until they enter the air spinning chamber. This prevents cross-contamination between different fiber types while still achieving uniform blending through air jet mixing in the chamber
Solution Approach 2:
The air jet acts as an intermediary medium that mixes the separately introduced webs within the spinning chamber without requiring them to share a common transport path. This eliminates contamination risks while maintaining blending effectiveness
3Manufacturing precision
If machine settings are recalibrated for each blended yarn type, then spinning accuracy is maintained, but productivity decreases due to frequent adjustments
Solution Approach 1:
The invention maintains constant machine parameters by drawing each web independently at its own optimal speed through separate roller systems. The air jet velocity and chamber conditions remain fixed, eliminating the need for recalibration while adapting to different yarn requirements
Solution Approach 2:
The invention introduces dynamic control at the web feeding stage through independently variable drawing roller speeds for each web. This allows flexible adaptation to different fiber types and yarn specifications without changing the fixed spinning chamber parameters, maintaining both accuracy and productivity
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
Enables efficient production of blended yarns with improved spinnability and reduced defects, allowing the use of carded cotton and reducing processing time and costs by merging webs directly into the spinning chamber, achieving desired yarn counts and blend ratios without additional operations.
Implementation Method 1
directing jets of air on the webs, inside the spinning chamber, in a direction substantially tangential to said webs, so as to interweave said webs together
Data Source
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AI summary
A drawing method for air spinning machines with multiple feeds, comprising the steps of: - preparing at least two webs of textile fibers to be fed by at least a respective first introducer element and a second introducer element, upstream of an air spinning device, - feeding with said webs, separate from each other, a plurality of pairs of drawing rollers, comprising at least one drive roller per pair, said drawing rollers being suitable to progressively draw each web simultaneously intercepted by them. - feeding said webs, drawn and separate from each other, into a spinning chamber so as to blend them within said chamber and to obtain a single yarn with the desired features.