Air Spinning Apparatus Eccentric Insertion Channels
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Solution Overview
Problem
Air-jet spinning machines face issues with barring phenomena and colorimetric variability when producing mixed yarns from multiple fibre webs, due to irregular tensions, twists, and couplings, which are not adequately addressed by mere web separation.
Innovation Solution
A drawing and spinning apparatus with independent introducer elements and an air spinning device that aligns fibre web insertion channels offset from the spinning chamber's geometric center, using tangential air jets to interweave fibers uniformly, and dual channel condensers to progressively draw and separate fibers before mixing in the spinning chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete separation of the path of the two webs is carried out until entry to the introducer nozzle, then the mechanical properties of the thread are strengthened and barring phenomena are limited, but the colorimetric yield of the final yarn becomes variable and machine setup complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-aligning the groove bottoms of the insertion channels along a segment offset from the geometric center before the webs enter the spinning chamber. This pre-positioning ensures that the fibers from multiple webs are introduced at predetermined locations that promote uniform mixing, thereby maintaining mechanical properties while reducing setup complexity and colorimetric variability.
2Object-affected harmful factors
If extreme separation of the webs is carried out to separate the fibres up to the direct exposure to the air flows in the chamber, then barring phenomena are limited, but colorimetric variability increases and setup attention requirements increase
Solution Approach 1:
The patent applies asymmetry by deliberately offsetting the groove bottoms of the insertion channels from the geometric center of the spinning chamber. This asymmetric arrangement ensures that fibers from different webs are introduced at non-symmetric positions that promote thorough mixing by the air jets, thereby eliminating barring phenomena while achieving uniform color distribution in the final yarn.
3Productivity
If multiple webs are fed simultaneously into the spinning chamber, then productivity is increased, but barring phenomena and non-uniformity of color occur due to incorrect couplings, irregular tensions and irregular twists
Solution Approach 1:
The patent applies segmentation by providing independent introducer elements for each web, allowing separate control and introduction of multiple fiber webs into the spinning chamber. Each introducer element can independently manage its web's tension and positioning, enabling simultaneous processing of multiple webs while maintaining uniform yarn quality and preventing barring phenomena through proper segmentation of the feeding paths.
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 solution eliminates barring and ensures precise color control in mixed yarns, achieving uniform and symmetrical mixing of fibers, regardless of their color, material, or quality, by ensuring symmetrical fiber entry and controlled aerodynamic action within the spinning chamber.
Implementation Method 1
spinning chamber (40) comprises a plurality of jets of air (44, 48) oriented in a direction substantially tangential to the same webs (N1, N2) in input to the spinning chamber (40) itself, so as to interweave said webs (N1, N2) and obtain a single yarn (F) in output from the air spinning chamber (20)
Data Source
AI summary
A drawing and spinning apparatus of mixed yarns for air spinning machines with multiple feeds comprises at least a first and a second introducer element, an air spinning device, a drawing device, interposed between the introducer elements and the air spinning device, an air spinning chamber, an introducer nozzle shaped to receive the webs from the drawing device into respective insertion channels and introduce the webs into the spinning chamber according to a longitudinal feeding direction. With respect to a cross-section plane perpendicular to the longitudinal feed direction, groove bottoms of each of the two insertion channels of the webs into the chamber are aligned along a segment which is offset by an eccentricity with respect to a geometric centre of the chamber itself, through which a symmetry axis of the spinning chamber passes, the eccentricity being less than 5% of a maximum diameter of the spinning chamber.