Diffusing Shaft Stepped Design for Non-Woven Fabric Strength
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Solution Overview
Problem
Existing non-woven fabric manufacturing methods struggle to achieve a balance between uniformity and strength, as high uniformity often results in insufficient filament entanglement, leading to reduced strength.
Innovation Solution
The apparatus includes a diffusing shaft with a slit-shaped air guide and a stepped portion connecting two shaft portions, where the opening width increases in the machine direction, promoting speed fluctuations in the jetting wind and enhancing filament entanglement, thereby improving the strength of the non-woven fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the opening width of the diffusing shaft is increased in the machine direction, then filament entanglement is enhanced and strength is improved, but manufacturing precision of uniformity may deteriorate
Solution Approach 1:
The diffusing shaft incorporates a stepped portion that creates localized regions with different opening widths along the machine direction. This local variation in geometry allows enhanced filament entanglement in specific zones while maintaining overall uniformity, resolving the contradiction between strength improvement and uniformity preservation.
Solution Approach 2:
The stepped portion design creates dynamic flow conditions within the diffusing shaft, where air velocity and filament trajectories vary along the machine direction. This dynamic approach enables controlled entanglement enhancement without compromising the uniform distribution of filaments across the web.
2Strength
If a stepped portion is added to the diffusing shaft, then filament entanglement is promoted and strength increases, but device complexity increases
Solution Approach 1:
The diffusing shaft is segmented into distinct sections with different opening widths along the machine direction. This segmentation into a stepped structure allows the shaft to perform multiple functions (uniform diffusion and entanglement enhancement) without requiring entirely separate components, thus limiting the increase in device complexity.
Solution Approach 2:
The stepped portion of the diffusing shaft serves dual purposes: it maintains the primary function of uniform filament diffusion while simultaneously enhancing filament entanglement to improve strength. This multi-functionality approach avoids the need for additional separate devices, controlling the increase in device complexity.
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 effectively increases filament entanglement, resulting in a non-woven fabric with improved strength while maintaining uniformity, as the diffusing shaft's design enhances the speed fluctuation of the jetting wind, leading to a more robust web production.
Implementation Method 1
air (jetting wind) passing through the inside of the diffusing shaft is diffused in the machine direction and is jetted from an opening at the lower side of the diffusing shaft
Implementation Method 2
promoting speed fluctuations in the jetting wind and enhancing filament entanglement
Implementation Method 3
air (jetting wind) passing through the inside of the diffusing shaft is diffused in the machine direction
Implementation Method 4
collecting and depositing the filaments, which are jetted from the outlet side of the second shaft portion, in the collecting unit to produce a web
Data Source
AI summary
Apparatus for manufacturing a non-woven fabric includes a diffusing shaft, which includes a first shaft portion in a defined location and provided with a slit-shaped air guide, wherein filaments are supplied together with air from an inlet side of the air guide to an outlet side of the air guide; a second shaft portion in a defined location, having an inlet side that is communicated with an outlet side of the first shaft portion and an outlet side that is disposed to face a filament collecting unit, wherein an opening width along a machine direction of the inlet side of the second shaft portion is larger than an opening width along a machine direction of the first shaft portion; and a stepped portion provided at a connecting portion between the outlet side of the first shaft portion and the inlet side of the second shaft portion and connecting the same.