US Patent 7267789 - Melt blowing method used to form nanofiber webs

http://www.freepatentsonline.com/7267789.html

Melt blowing is a process for producing fibrous material using high velocity air to attenuate filaments. This patent from Procter & Gamble uses this method to embed particles into nanofiber webs. Claim 1 reads:

1. A method of forming a nonwoven web comprising the steps of: a. forming fibers from a melt film fibrillation process including a central fluid stream, b. introducing particulates into the central fluid stream, c. mixing said fibers with said particulates to form a fiber-particulate mix, and d. depositing the mix on a surface to form a web.