Porous ptfe film and a manufacturing method therefor

B - Operations – Transporting – 01 – D

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B01D 69/12 (2006.01) B01D 67/00 (2006.01) B01D 71/36 (2006.01)

Patent

CA 2202646

A nonwoven web is described that is a thin porous polytetrafluoroethylene membrane consisting essentially of a nonwoven web having a microstructure of substantially only microfibrils fused at crossover points. It is usually strong, is unusually thin, has unusually small pore sizes, but a very high air flow-through. It has a pore size between 0.05 and 0.4 micrometers; a bubble point between 10 and 60 psi; a pore size distribution value between 1.05 and 1.20; a ball burst strength between 0.9 and 17 pounds/force; an air flow of between 20 Frazier and 10 Gurley seconds; a thickness between 1.0 - 25.4 micrometers; and a fiber diameter ranging between 5 and 200 nm.

On décrit une nappe non tissée qui est une membrane poreuse de polytétrafluoroéthylène consistant essentiellement en une nappe non tissée dont la microstructure n'est composée essentiellement que de microfibrilles fondues au niveau de leurs points de croisement. Cette nappe est généralement résistante, extraordinairement mince, et elle présente des tailles de pores extraordinairement petites qui permettent cependant un débit d'air très important. Cette nappe possède une taille de pores se situant entre 0,05 et 0,4 micromètres, un point d'ébullition compris entre 10 et 60 psi; une valeur de distribution de la taille des pores se situant entre 1,05 et 1,20, une résistance à l'éclatement à la bille de l'ordre de 0,9 à 17 livres, un débit d'air compris entre 20 secondes Frazier et 10 secondes Gurley, une épaisseur se situant entre 1,0 et 25,4 micromètres, ainsi qu'un diamètre de fibre compris entre 5 et 200 nm.

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