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US 2020/0270787 A1Published application
Spunbond filters with low pressure drop and high efficiency
AssigneeNorth Carolina State University
InventorBehnam Pourdeyhimi
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Abstract
Disclosed are methods of partially or fully fibrillating bicomponent filaments of the island-in-the-sea configuration by hydroentangling. The hydroentangling energy can both fibrillate the sea component as well as entangling the sea and island components for bonding. Fabrics that are made from these at least partially fibrillated and bonded fibers are also disclosed. These fabrics have low pressure drop and high efficiency and can be used for filters and masks.
Claims29
A method for producing a nonwoven fabric, comprising:
- providing a bicomponent filament having an external fiber component and an internal fiber component;
- wherein the external fiber component at least partially enwraps the internal fiber component;
- and wherein the external fiber component is 5% to 25 wt. % of the filament;
- and
- partially fibrillating the filament by hydroentangling with at least three manifolds, each manifold having a plurality of water jets, and wherein at least two of the manifolds have water jets at least 1200 microns apart.
2 more elements
Dependencies are inferred from the claim text.