Nonwoven fabrics are provided that include (i) a plurality of continuous matrix fibers comprising a first polymeric material having a first melting point and including a first polymer component, in which the first polymer component comprises a first recycled-polyester, and (ii) a plurality of binder fibers having an irregular cross-section randomly dispersed throughout the plurality of matrix fibers, in which the plurality of binder fibers comprising a second polymeric material having a second melting point including a second polymer component. The second melting point being less than the first melting point.

Filter media, such as electret-containing filtration media for filtering gas streams (e.g., air), are described herein. In some embodiments, the filter media may be designed to have desirable properties such as stable filtration efficiency over the lifetime of the filter media, increased normalized gamma, relatively low pressure drop (i.e. resistance), and/or relatively low basis weight. In certain embodiments, the filter media may be a composite of two or more types of fiber layers where each layer may be designed to enhance its function without substantially negatively impacting the performance of another layer of the media. For example, one layer of the media may be designed to have a relatively low basis weight and/or a relatively high air permeability, and another layer of the media may be designed to have stable filtration efficiency and/or a relatively high efficiency throughout the filter media's lifetime. The filter media described herein may be particularly well-suited for applications that involve filtering gas streams (e.g., face masks, cabin air filtration, vacuum filtration, room filtration, furnace filtration, respirator equipment, residential or industrial HVAC filtration, high-efficiency particulate arrestance (HEPA) filters, ultra-low particular air (ULPA) filters, medical equipment), though the media may also be used in other applications.

An air filter medium includes a glass filter medium layer that includes a glass fiber. The glass filter medium layer has a protruding portion. The protruding portion undergoes a change in protrusion height of 70% or less when left to stand at an atmospheric temperature of 100° C. for one hour.

A fabric for use in filters separating water from a water/diesel emulsion, and a method of using such a fabric, where the fabric has a rectangular mesh, the sides of which are formed by respective threads. In comparison with prior art fabrics for water/diesel filters, the fabric of the invention offers the advantage of having a higher separation efficiency, thus allowing separation of diesel with a lower residual water content downstream of the filter.

A filter media, filter element, filter system and methods are provided. The filter media provides improved filter characteristics including water separation efficiency. The filter media may include one or more of increased surface roughness and/or embossments. The filter media may be provided by pleated filter media.

Filter media comprising non-woven fiber webs and having one or more advantageous structural properties are generally described. In some embodiments, a filter media and/or non-woven fiber web described herein has one or more properties that are both beneficial and easily obtainable by undulating the non-woven fiber web, such as by performing a creping procedure. This property may be characteristic of the procedure employed to form the undulations (e.g., creping and/or microcreping), or may be attainable via one or more methods of undulation.

The air filter medium of the present invention is an air filter medium including a stack of a porous polytetrafluoroethylene (PTFE) membrane and an air-permeable support member, a repulsive force generated in the medium when the medium is compressed in a thickness direction thereof is equal to or greater than 30 kPa and equal to or less than 150 kPa at a compression ratio of 30%, and at least one main surface of the air filter medium is formed by the air-permeable support member and has a maximum coefficient of friction of 24 gf or less. The air filter medium of the present invention is an air filter medium that uses a porous PTFE membrane and in which a decrease in collection efficiency due to pleating is inhibited.

Embodiments disclosed herein relate to filter media having a downstream layer of filter material and an upstream layer of fibers. The downstream layer of filter material has a capture efficiency of at least 10% and the upstream layer of fibers has a mean fiber diameter of at least 10 microns and a solidity of less than 10%. A spacing structure defines a mean void distance between the upstream layer of fibers and the downstream layer of filter material.

A dual layer filter material for separating fluid or particulates from flowing air streams that is comprised of connected layers of nonwoven batting with one layer having a convoluted surface.

A filtration media with improved filtration, strength, tear resistance and air permeability in the form of a relatively thin and lightweight wet-laid fibrous web that has a wet Mullen ratio of 60% to 80% to ensure that the media is flexible enough to be formed into a fluted structure, and strong enough to retain the fluted structure when wound into a roll and to permit further processing without the media becoming too brittle. The filtration media comprises a blend of cellulose and synthetic fibers having a weight percent of 81 wt % to 87 wt % of a weight of the media and a resin binder having a weight of 13 wt % to 19 wt % (preferably about 16 wt %) of the weight of the media.