Air-Jet Roving Machine Spindle Diameter Control
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Solution Overview
Problem
Conventional roving machines, including air-jet spinning machines, produce roving with excessive twist, making it unsuitable for further processing in spinning machines due to high centrifugal forces and tight wrapping of fibers, limiting the roving's drawability and usability.
Innovation Solution
A roving machine with a spindle having a specific diameter range (4 mm to 12 mm) and design features that control air flow and vortex formation in the whirlpool chamber, allowing for a protective twist that maintains fiber cohesion while enabling drawability, using an air-jet spinning process with optimized dimensions for the spindle, vortex chamber, and fiber guide elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air-jet spinning machines are used to produce roving, then delivery speed is improved, but the roving becomes over-twisted and loses drawability
Solution Approach 1:
The patent changes the geometric parameters of the spinning system, specifically the spindle diameter (4-12 mm) and vortex chamber dimensions, to control the air flow characteristics and reduce the twist intensity applied to the roving, thereby maintaining drawability while achieving high delivery speeds
Solution Approach 2:
The patent replaces the traditional mechanical drafting and twisting system with an air-jet based system that uses controlled air currents to form the roving, eliminating the need for mechanical contact and excessive twisting while maintaining production efficiency
2Strength
If protective twist is applied to prevent tearing, then roving strength is improved, but the roving becomes difficult to process in spinning machines
Solution Approach 1:
The patent optimizes the air flow parameters and spindle geometry to apply only the necessary minimum twist for strength, controlling the proportion and wrapping strength of twisted fibers to maintain both strength and processability
3Strength
If conventional air-jet spinning geometry is used, then yarn strength is maximized, but the roving cannot be used for further spinning due to tight fiber wrapping
Solution Approach 1:
The patent modifies the geometric parameters of the spinning position, particularly increasing the spindle diameter to 4-12 mm and adjusting the vortex chamber dimensions, to reduce the wrapping tightness of fibers while maintaining sufficient strength for handling
Solution Approach 2:
The patent applies partial twisting action, where only part of the outer fiber ends are wrapped around the core fibers, rather than complete wrapping, to achieve sufficient protective twist while leaving the roving drawable for further 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 machine produces a roving with the necessary strength and deformability for subsequent spinning processes, enhancing delivery speed and maintaining the roving's integrity during winding and transport, while avoiding over-twisting or inadequate twist issues.
Implementation Method 1
guide a fiber structure through a vortex chamber in which an air vortex is generated
Implementation Method 2
an air nozzle is assigned, via which air can be guided into the eddy chamber
Implementation Method 3
their delivery speed is limited due to the centrifugal forces that occur
Data Source
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AI summary
The invention relates to a pre-spinning machine for producing a roving (1) from a fiber composite (2), wherein the pre-spinning machine comprises at least one spinning station (3) which has a vortex chamber (4) with an inlet opening (5) for the fiber composite (2) and a roving forming element in the form of a spindle (6) extending at least partially into the vortex chamber (4), wherein the vortex chamber (4) is associated with at least one air nozzle (8) through which air can be directed into the vortex chamber (4), and wherein the spindle (6) has a take-off channel (9) through which the roving (1) can be drawn off from the vortex chamber (4). According to the invention, it is proposed that the extraction channel (9) in the area of the vortex chamber (4) has an inlet opening (10) for the roving (1) to be extracted from the vortex chamber (4) with an inner diameter (F) of which is between 4 mm and 12 mm, preferably between 6 mm and 8 mm.