3m Innovative Properties Company

Minnesota Mining and Manufacturing Company

Michael D Romano

Michael D Swan

Eric M Moore

Pamela A Percha

Myles Lee Brostrom

Liming Song

Sachin Talwar

Daniel J Zillig

Randy L Christiansen

Matthew T Scholz

Scott J Tuman

John M Brandner

Nicholas R Baumann

John A Temperante

Shannon Dowdell

Myles L Brostrom

A process and apparatus for producing a dimensionally stable melt blown nonwoven fibrous web. The process includes forming a multiplicity of melt blown fibers by passing a molten stream including molecules of at least one thermoplastic semi-crystalline (co)polymer through at least one orifice of a melt-blowing die, subjecting at least a portion of the melt blown fibers to a controlled in-flight heat treatment operation at a temperature below a melting temperature of the at least one thermoplastic semi-crystalline (co)polymer immediately upon exiting from the at least one orifice, and collecting at least some of the melt blown fibers subjected to the controlled in-flight heat treatment operation on a collector to form a non-woven fibrous structure. The nonwoven fibrous structure exhibits a Shrinkage less than a Shrinkage measured on an identically-prepared structure including only fibers not subjected to the controlled in-flight heat treatment operation, and generally less than 15%.

Dimensionally-stable melt blown nonwoven fibrous structures, and methods and apparatus for making same

Process of making dimensionally-stable melt blown nonwoven fibrous structures

A face mask including a face-contacting layer, an outer cover layer, a polymeric microfiber mat disposed between the face-contacting layer and the outer cover layer, and a non-woven fibrous mat disposed between the face-contacting layer and the outer cover layer. The non-woven fibrous mat includes polymeric fibers and a surface energy reducing agent. The face-contacting layer, the cover layer, the polymeric microfiber mat, and the non-woven fibrous mat cooperate with each other to allow gas to pass through the mask while inhibiting the passage of liquid through the mask.

Liquid resistant face mask having surface energy reducing agent on an

Growing community of inventors

Circle Pines, MN, United States of America

Michael D Romano