US 12,729,467 B2 · Use of lyocell fibers

Abstract

The invention relates to the use of a lyocell fiber (1) for the manufacture of a nonwoven fiber fleece (10, 100). To manufacture a thin nonwoven fiber fleece with sufficient mechanical properties, the use of a lyocell fiber is proposed, where the fiber (1) has a cross-sectional aspect ratio of at least 1.8. The invention further relates to a nonwoven fiber fleece (10, 100). In order to manufacture a thin nonwoven fiber fleece (10, 100) suitable for use as a battery separator, it is proposed, that the fiber fleece comprises at least two layers (11, 12) of fibrillated lyocell fibers (13), with the fibrillated lyocell fibers (13) having solid cores (14, 110) and fibrils (15) protruding from said cores (14), the fibers and fibrils (15) being intermingled to form the fiber fleece (10), embedding the solid cores (14) therein, whereby the solid cores (14, 110) of the fibrillated lyocell fibers (13) have an average cross-sectional aspect ratio k of at least 1.5.

Claims13

Dependent claims

A nonwoven fiber fleece comprising at least two layers of fibrillated lyocell fibers, with the fibrillated lyocell fibers having solid cores and fibrils protruding from the solid cores, the fibrillated lyocell fibers and fibrils being intermingled to form the nonwoven fiber fleece, wherein the solid cores are embedded in the nonwoven fiber fleece, whereby the solid cores of the fibrillated lyocell fibers have an average cross-sectional aspect ratio k of at least 1.5, wherein the average cross-sectional aspect ratio k is defined by k=b/h, where b is a mean visible width of the solid cores from a microscopic top view of the fiber fleece and h is a mean visible height of the solid cores from a microscopic cross-sectional view of the fiber fleece.

Dependencies are inferred from the claim text.

Use of lyocell fibers

Life of this patent

Use of lyocell fibers

Life of this patent

Abstract

Claims13