Ceramic Nozzle Core for Loop Yarn Texturing
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Solution Overview
Problem
Existing texturing nozzle technologies face limitations in maintaining yarn stability and quality at high production speeds, with previous solutions experiencing a sharp drop in yarn tension and quality issues due to the inability to effectively intensify the supersonic flow and optimize the air injection angle.
Innovation Solution
The development of a ceramic nozzle core with a constant wall strength, optimized for the central functions of yarn treatment and air injection, produced through injection molding, featuring a cylindrical segment with enlarged conical sections and increased air injection angles beyond 48°, allowing for intensified supersonic flow and improved yarn tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the supersonic flow is intensified to increase production speed above 600 m/min, then productivity increases, but yarn tension drops sharply and quality deteriorates
Solution Approach 1:
The invention changes the geometric parameters of the acceleration duct, specifically optimizing the expansion angle and length to control the supersonic flow characteristics. By adjusting these parameters, the shock front position is controlled to maintain yarn tension while allowing high production speeds above 600 m/min, resolving the contradiction between productivity and yarn quality
Solution Approach 2:
The invention creates a dynamic flow regime by designing the acceleration duct to generate a controlled shock front that moves with the yarn. This dynamic approach allows the system to adapt the flow conditions to maintain optimal yarn tension across varying production speeds, preventing the sharp tension drop that occurs in static designs at high speeds
2Manufacturing precision
If the air injection angle is optimized to improve yarn stability, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The invention merges the air injection function directly into the acceleration duct structure by forming the injection bores within the duct walls. This integration eliminates the need for separate air injection components and simplifies the overall nozzle structure while maintaining optimized air injection angles for yarn stability
Solution Approach 2:
The acceleration duct serves multiple functions: it accelerates the air flow to supersonic speeds, generates the shock front, and simultaneously provides the air injection bores for yarn stabilization. This multi-functionality reduces device complexity while achieving precise yarn stability control through optimized injection angles
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 enables high-quality loop yarn production at increased speeds by maintaining consistent yarn tension and preventing knot formation, with the ceramic nozzle core design allowing for economical production and easy replacement, enhancing the texturing process efficiency.
Implementation Method 1
The compressed air jet is accelerated in a Laval nozzle to 2.5 to 4 Mach
Implementation Method 2
The compressed air jet is accelerated in a Laval nozzle to 2.5 to 4 Mach, i.e. to a supersonic speed
Implementation Method 3
The difference in speed is increased directly before and after the shock front, which has a direct effect on the corresponding air attack forces on the filaments
Data Source
AI summary
The invention relates to a ceramic nozzle core and a method for producing a ceramic nozzle core which is part of a device used for producing loop yarn. The inventive ceramic nozzle core is embodied with an approximately constant wall thickness and a reduced size so as to perform the central functions of the yarn processing duct comprising air injection and a yarn outlet for forming loops while being produced in a molding process. In a particularly preferred method, the ceramic nozzle core is injection-molded with high precision. The inventive ceramic nozzle core can be configured in a miniaturized fashion and as part of a two-piece nozzle core, the ceramic nozzle core being inserted into an outer nozzle core jacket. The two-piece nozzle core can be incorporated into a housing known in prior art, for example, as a replaceable nozzle core.