Fancy Yarn Assembly With Airflow Entanglement and Real Twist
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Solution Overview
Problem
Existing methods for producing fancy yarns, such as those described in WO 2020/044493 A1, suffer from instability in maintaining the bundled form of tangled decorative fibers and main yarns due to mere twisting, leading to potential fiber detachment.
Innovation Solution
A production device that interlaces decorative fibers with a main yarn using an airflow to cut and entangle them, ensuring firm entanglement through a real-twist structure with a second yarn, enhancing structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If decorative fibers are supplied sideways onto a running main yarn and a sub yarn is interlaced with them, then the fancy yarn production is enabled by a simple device, but the ability for keeping bundled form is insufficient due to mere twisting
Solution Approach 1:
The device divides the yarn processing into separate functional zones: a first twisting zone for the main yarn, a second twisting zone for the sub yarn, and an interlacing zone where the sub yarn passes through the main yarn. This segmentation allows each component to be optimized independently while achieving stable bundled form through coordinated action in different zones.
Solution Approach 2:
The invention introduces a spatial dimension by having the sub yarn pass through the main yarn in a direction different from the main yarn's axis. The sub yarn is twisted in one direction while the main yarn is twisted in another direction, creating three-dimensional interlacing that enhances bundled form stability beyond simple planar twisting.
2Productivity
If yarns are tangled together merely by tendency to condense effected by twisting, then the production process is simple, but the bundled form cannot be maintained reliably
Solution Approach 1:
The device performs preliminary twisting of the main yarn and sub yarn in separate zones before they reach the interlacing point. This preliminary action pre-aligns the fibers and creates initial entanglement structure, ensuring that when the sub yarn passes through the main yarn, the bundled form is already predisposed to maintain stability rather than relying on post-hoc twisting.
Solution Approach 2:
The invention introduces an intermediary structure where the sub yarn acts as a mediator between the main yarn and the decorative fibers. The sub yarn is twisted and then passes through the main yarn, creating a stable interlaced structure that reliably maintains bundled form while allowing continuous production.
3Ease of manufacture
If decorative fibers are interlaced with main yarn through twisting, then the fancy yarn is produced, but the decorative fibers may detach due to insufficient entanglement
Solution Approach 1:
The device employs dynamic twisting actions where the main yarn and sub yarn are twisted in opposite directions with different magnitudes. The sub yarn is twisted more intensely and in the opposite direction to the main yarn, creating dynamic interlacing that strengthens entanglement and prevents decorative fiber detachment while maintaining ease of production.
Solution Approach 2:
The invention creates a composite yarn structure combining main yarn, sub yarn, and decorative fibers in a multi-component interlaced configuration. This composite structure distributes mechanical stresses more effectively than single-component yarns, enhancing overall entanglement strength and preventing detachment of decorative fibers during handling and processing.
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
The device ensures that decorative fibers are securely integrated into the yarn, preventing detachment and providing a stable, decorative effect.
Implementation Method 1
an assembly for feeding the decorative fibers (5c) to the first yarn (1), wherein the assembly for feeding the decorative fibers (5c) comprises an ejection nozzle (19) and a cutter (21), and the ejection nozzle (19) is for guiding an airflow (A1)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A production device for producing a fancy yarn at least including first and second yarns and decorative fibers tangled in the yarns is provided with: a first bobbin rotating about its axis to feed and swirl the first yarn; an ejection nozzle for feeding the decorative fibers to a range where the first yarn swirls; and a second bobbin including a hollow spindle through which the first yarn with the decorative fibers passes and rotating about its axis to feed and swirl the second yarn so as to wrap the second yarn around the first yarn with the decorative fibers.