Remote fluorination of fibrous filter webs

摘要

A method of making a fluorinated fibrous web, which method includes providing a nonwoven web (22) that contains polymeric fibers, creating a plasma that contains fluorine atoms at a first location (14), and contacting the nonwoven web with products from the plasma at a second location (26) remote from the first location (14). The method avoids exposure of the web to the plasma and hence expands the manufacturing processing window. Webs so fluorinated have a different C