RESIN IMPREGNATED FIBER WEBS

摘要

The present disclosure relates to filter media having one or more pre-filter layers disposed upstream a main filtration layer. The main filtration layer may include synthetic polymer fibers (e.g., continuous meltblown fibers). A coating (e.g., binder resin) may be suitably applied to at least a portion of the main filtration layer (e.g., saturated, impregnated) and/or other layers of the filter media (e.g., pre-filter layer(s), scrim, etc.), or portions thereof. In some embodiments, the coating has a cure temperature that is comparatively less than a shrinkage temperature of the synthetic polymer fibers of the filtration layer(s). In some embodiments, the coating may coat a 5 cm×5 cm area, or a majority area, of the outer surface of the second layer. In some embodiments, the second layer has a pressure drop of less than about 80 kPa, a mean flow pore size of between about 0.05 micron and about 30 microns with the standard deviation of the mean flow pore size of the second layer being less than about 10 microns.

主权项

1. A filter media comprising:
a first layer including fibers having a first average diameter of between about 0.3 microns and about 40.0 microns; a second layer adjacent to the first layer, the second layer including synthetic polymer fibers having a second average diameter of between about 0.05 microns and about 15.0 microns and an average fiber length of at least about 5 cm, wherein the first average diameter is greater than the second average diameter; and a resin coating that coats a majority of an outer surface of the second layer, wherein the filter media has an air permeability of between about 0.5 cfm/sf and about 500 cfm/sf, a basis weight of between about 1 g/m2 and about 600 g/m2 and a thickness of between about 1 mils and about 300 mils.