Multi-Row Coaxial Spinneret for Transverse Nonwoven Strength
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Solution Overview
Problem
Current non-woven fabric production methods using multi-row coaxial spunbond and/or melt-blown plants result in layers that are robust only along the main development direction, leading to weaknesses perpendicular to this direction, particularly evident in the manufacturing of diapers where tear resistance is compromised.
Innovation Solution
The development of a spinneret for multi-row coaxial spunbond and/or melt-blown type plants that incorporates acceleration conduits with varying angles of inclination, allowing polymer filaments to exit in different directions, thereby enhancing the robustness of the non-woven fabric layers in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acceleration conduits are arranged in a single row along the main development direction, then productivity is improved through efficient polymer distribution, but the non-woven fabric layer becomes weak perpendicular to the main direction
Solution Approach 1:
The patent introduces a second row of acceleration conduits arranged perpendicular to the first row, transforming the single-direction (one-dimensional) conduit arrangement into a two-dimensional grid pattern. This dimensional change allows polymer filaments to be deposited in both main development direction and transverse direction, creating a cross-linked fiber network that significantly improves tear resistance perpendicular to the main direction while maintaining production efficiency through continuous multi-directional deposition
2Ease of manufacture
If conventional spinneret design with parallel conduits is used, then manufacturing simplicity is maintained, but the non-woven fabric lacks robustness in transverse direction
Solution Approach 1:
The spinneret is segmented into multiple independent acceleration conduits arranged in perpendicular rows, with each conduit capable of depositing polymer filaments independently. This segmentation allows the system to maintain the simplicity of individual conduit manufacturing while achieving complex multi-directional fiber deposition patterns that enhance transverse structural robustness through the cumulative effect of numerous oriented filament bundles
3Device complexity
If single-direction fiber deposition is used, then device complexity is minimized, but the resulting non-woven fabric has compromised durability and tear resistance
Solution Approach 1:
The patent employs asymmetric arrangement of acceleration conduits in perpendicular rows, where the first row conduits are oriented at an angle relative to the main development direction and the second row conduits are oriented at a different angle. This asymmetric multi-directional configuration creates a more reliable, isotropic non-woven fabric structure with enhanced tear resistance in all directions, while the asymmetry itself is achieved through relatively simple conduit positioning rather than complex mechanical systems
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 the production of non-woven fabric layers that are robust not only along the main axis but also transversely to it, significantly improving the durability and tear resistance of products like diapers, ensuring better liquid tightness and functionality.
Implementation Method 1
The polymer inside the dispensing conduit is pushed under pressure and at high temperatures, usually above 200° C., towards the extrusion head
Implementation Method 2
the molten polymer reaches the distributor. Between the distributor, or breaker plate, and the extrusion head there is a filter
Data Source
AI summary
There is provided a spinneret (1) for a multi-row coaxial spunbond and/or melt-blown type plant developing along a main axis (1a) and a main plane (1b), defining a vertical axis (1c) perpendicular to the main axis and plane (1a, 1b) and comprising a first end (10) adapted to interface with a polymeric fluid distributor of a multi-row coaxial spunbond and/or melt-blown type plant; a second end (11) arranged at a side of the spinneret (1) opposite the first end (10) with respect to the main plane (1a) at which the polymer fluid exits from the spinneret (1) in the form of polymer filaments; and a plurality of acceleration conduits (2) extending at least from the first end (10) to the second end (11) each along its own dispensing axis (2a), each adapted to dispense a respective polymer filament along the dispensing axis (2a) and distributed both along a distribution axis (2b) transverse to the main axis (1a) and the vertical axis (1c) so as to create a first row (2′), and parallel to the main axis (1a) so as to make at least a second row (2″) offset with respect to the first row (2′) along the main axis (1a); and wherein at least one of the dispensing axes (2a) of the acceleration conduits (2) of the first row (2′) defines a first angle of inclination (α′) with respect to the main plane (1b) other than 90° and at least one of the dispensing axes (2a) of the acceleration conduits (2) of the second row (2′) defines a second angle of inclination (α′) with respect to the main plane (1b) different from the first angle of inclination (α′).