Intertwining Knot Production in Multifilament Thread via Pulsed Airflow
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Solution Overview
Problem
Existing methods for producing interlacing knots in multifilament threads struggle to achieve a high number of stable knots per unit length at high yarn speeds with low volume flows and short pulse times, requiring inefficient energy consumption.
Innovation Solution
The method involves generating dynamic flow changes within the treatment channel by blowing air flow pulses at a predetermined frequency, supported by auxiliary air flows that can be continuous or pulsed, with different blowing directions, to enhance knot formation, allowing for reduced compressed air usage and increased knot density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high yarn speeds are used to increase productivity, then production efficiency is improved, but the stability and quality of interlacing knots deteriorate
Solution Approach 1:
The patent applies periodic action by using pulsed compressed air flows instead of continuous flows. The air delivery system generates periodic air pulses that act on the multifilament thread at high frequency, creating repeated twisting and interlacing actions that form stable knots even at high yarn speeds. This periodic intervention ensures sufficient knot formation time at each pulse while maintaining overall high productivity.
Solution Approach 2:
The patent implements dynamics by making the air delivery system adjustable and adaptive. The system can vary pulse frequency, pulse duration, and air pressure dynamically to match different yarn speeds and thread types. This dynamic adjustment allows the knotting process to remain effective across a wide range of operating conditions, particularly at high speeds where traditional static systems fail.
2Manufacturing precision
If high volume flows and long pulse times are used to improve knot formation, then interlacing knot quality is improved, but energy consumption increases
Solution Approach 1:
The patent uses periodic pulsed air flows with optimized pulse durations rather than continuous high-volume flows. Each pulse is precisely timed and controlled to deliver just enough energy to create the necessary turbulence for knot formation. This periodic approach significantly reduces total energy consumption compared to continuous operation at high flow rates.
Solution Approach 2:
The patent applies parameter changes by optimizing multiple parameters simultaneously: pulse frequency, pulse duration, air pressure, and volume flow. By adjusting these parameters within specific ranges, the system achieves effective knot formation with minimal energy input. The ability to independently control these parameters allows for energy-efficient operation while maintaining high knot quality.
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 approach enables the production of a large number of stable interlacing knots at high thread speeds with minimal energy consumption, achieving improved knot quality and density while reducing energy requirements.
Implementation Method 1
the turbulence of the air flow forming in the treatment channel has an effect on the formation of the interlacing knots on the multifilament thread
Implementation Method 2
the air flow impulse blows into the bundle of filaments guided via the nozzle channel within the treatment channel in the direction of the cover
Data Source
AI summary
The invention relates to a method and a device for producing intertwining knots in a multifilament thread. Here, the thread is guided in a treatment channel, in which a nozzle channel opens, in order to periodically generate an air-flow pulse with an interval time between air pressure pulses which follow one another, wherein, during a pulse time, the air-flow pulse is directed transversely onto the thread which is guided in the treatment channel. In order for it to be possible to produce the formation of the intertwining knots with as little energy expenditure of the air pressure pulses as possible, according to the invention an auxiliary air flow is generated continuously or discontinuously and is blown into the treatment channel together with the air-flow pulse. The device according to the invention produces the intertwining knots by way of a rotating nozzle ring which has, in the circumference, a circumferential guide groove and at least one nozzle channel which opens radially into the guide groove. The nozzle ring is guided on a stator which has a chamber opening and a pressure chamber. The pressure chamber is connected to a compressed air source via a compressed air connection, with the result that, if the nozzle ring is rotated, the nozzle channel can be connected periodically to the chamber opening of the pressure chamber in order to generate an air-flow pulse. A cover is provided in the region of the chamber opening of the stator so as to lie opposite the nozzle ring, which cover forms a treatment channel with the nozzle ring. In order to influence the air flow and swirling within the treatment channel, at least one auxiliary nozzle channel which opens into the treatment channel and can be connected continuously or periodically to the compressed air source is provided on the nozzle ring and/or the cover.