Electret filter media and filtering masks that contain electret filter media

   
   

Electret filter media comprising a nonwoven web of thermoplastic nonconductive microfibers having trapped charge, said charge provided by (1) subjecting the nonwoven web to a corona treatment, followed by (2) impingement of jets of water or a stream of water droplets on the web at a pressure sufficient to provide the web with filtration enhancing electret charge and (3) drying the web. This electret filter media may be used in a respiratory mask to provide extraordinarily good filtration properties.

Los medios del filtro de Electret que abarcaban una tela no tejida de los microfibers nonconductive termoplásticos que atrapaban la carga, carga dicha proporcionaron (1) sujetando la tela no tejida a un tratamiento de la corona, seguido por (2) el choque de jets del agua o de una corriente de las gotitas del agua en la tela en una presión suficiente proveer de la tela la filtración que realzaba la carga del electret y (3) secando la tela. Los medios de este filtro del electret se pueden utilizar en una máscara respiratoria para proporcionar características extraordinario buenas de la filtración.

 
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