a manufacturing wlokniny layered filter especially to protective masks and wloknina stratified for protective masks

摘要

A self-supporting durable flexible conformable low-pressure- drop porous sheet product that contains a uniform three-dimensional arrangement of discrete solid particles. This sheet product comprises, in addition to the particles, a web of melt-blown microfibers in which the particles are uniformly dispersed. The particles are physically held in the web, even though there is only point contact between the microfibers and the particles, whereby the full surface of the particles is available for interaction with a medium to which the sheet product is exposed. The sheet product is especially useful in respirators in which, for example, the sheet product is shaped as a cup-like member adapted to fit over the mouth and nose of a person.