METHOD OF CHARGING ELECTRET FILTER MEDIA

摘要

PROBLEM TO BE SOLVED: To provide an electret-improved filter medium manufactured from a fiber, for example, a meltblown superfine fiber.

SOLUTION: This electret filter medium contains a nonwoven web of thermoplastic, nonconductive microfibers having trapped charge. This method of charging the electret filter media comprises a step (1) to make a jet water or a water droplet stream impinged against the web under a pressure sufficient to provide the web with filtration-enhancing electret charge to the web and a step (2) to dry the charged web.

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