Fiber sheet and method for producing same

Abstract

A fiber sheet (1) according to the present invention includes a plurality of stem fibers (2) containing a thermoplastic resin and extending in one direction and includes a fibril fiber (3) containing substantially the same thermoplastic resin as the above thermoplastic resin, extending between the stem fibers (2), and having a smaller diameter than that of the stem fibers (2). The plurality of stem fibers (2) include one stem fiber (2) and another stem fiber (2) branching from the one stem fiber and have a void between the stem fibers. The stem fibers (2) hold a plurality of inorganic particles (5). The fiber sheet preferably has a pore volume fraction of 50% or more and 98% or less. In the fiber sheet, the number of fibers having a diameter of 500 nm or less is preferably 50% or more of the total number of the constituent fibers. The inorganic particles preferably include zinc oxide. The fiber sheet is preferably produced by uniaxially drawing a resin sheet containing a thermoplastic resin and inorganic particles.

Dependencies are inferred from the claim text.