Sheet of microfiber assembly, and method and apparatus for making the same

摘要

The present invention aims to provide a sheet of microfiber assembly having a high filtering performance suitable as an oil-mist filter. A sheet of microfiber assembly 2 comprises microfibers 1 each having a fiber diameter of 3,000nm or less and is formed of a mixture of water-insoluble but alcohol-soluble acetalized polyvinyl alcohol resin and water-insoluble but alcohol-soluble fluorine resin.