In the description and drawings a fiberglass product is disclosed. The fiberglass product may have one or more fiber curl layers. The fiber curl layers may have a plurality of generally sinusoidal fiber bundles therein.

A bag filter system for removing dust from a gas flow comprises a plurality of filter bags (41, 42), wherein each individual filter bag is supported by a metal cage (2, 3). The bag filter system is configured to determine an amount of dust (21) accumulated on surfaces of filter bags. Impedance-measuring equipment (43) is connected to the metal cages of at least two adjacent filter bags to determine an impedance value between the cages of the at least two adjacent bags. Since the determined impedance value is indicative of the amount of dust accumulated on the surfaces of the adjacent bags, it can be used for deciding when it is appropriate to initiate a cleaning process of these bags. In this way, it is ensured that bags are only cleaned when needed, and savings on compressed cleaning air as well as an extension of bag life can be achieved.

A laminated polyarylene sulfide heat-resistant filter has a plurality of layers, at least including a first web layer that is a filtering surface, and a second web layer that is a non-filtering surface, the laminated polyarylene sulfide heat-resistant filter being characterized in that the first web layer contains 30 to 70 wt % of polyarylene sulfide fibers having a fineness of 0.5 to 1.2 dtex, and 30 to 70 wt % of polyarylene sulfide fibers having a fineness of 1.3 to 3.0 dtex taking a total of a weight percentages of the first web layer as 100 wt %, wherein the second web layer contains polyarylene sulfide fibers having a fineness of 1.0 to 4.0 dtex.

A rigid support is disposed in a filtration media element. A first gas-permeable filtration media layer is disposed in an overlapping orientation with a second gas-permeable filtration media layer. The first and second layers define a void in which the support is disposed. The first layer is attached to the second layer near opposing edges of the first and second layers and at an attachment termination point substantially centrally located on the filtration media element. The filtration media element has a first media end and an opposite, second media end. The support has a first support portion that extends from the first media end toward the attachment termination point. The support has second and third support portions that extend from the first support portion toward the second media end with a gap between the second and third support portions in which the attachment termination point is disposed.

A rigid support is disposed in a filtration media element. A first gas-permeable filtration media layer is disposed in an overlapping orientation with a second gas-permeable filtration media layer. The first and second layers define a void in which the support is disposed. The first layer is attached to the second layer near opposing edges of the first and second layers and at an attachment termination point substantially centrally located on the filtration media element. The filtration media element has a first media end and an opposite, second media end. The support has a first support portion that extends from the first media end toward the attachment termination point. The support has second and third support portions that extend from the first support portion toward the second media end with a gap between the second and third support portions in which the attachment termination point is disposed.

A fastening system for filter bags and baskets. The filter bag with a first outer diameter for filtering dust particles and a filter basket for the internal stabilization and fastening of the filter bag. A connecting region arranged on a perforated filter plate for connecting the filter bag and/or the filter basket to the filter installation. The connecting region includes a cutout for the filter bag. The filter bag includes at one end at least one snap ring for the connection to the connecting region, and has a second outer diameter in the region of the snap ring. The filter basket includes at its upper end at least two spring elements for connection to the connecting region. The snap ring is elastically deformable and can be brought into at least a first shape, the cross-sectional area whereof is smaller than an area of the inner cross-section of the cutout of the perforated filter plate.

A fastening system for filter bags and baskets. The filter bag with a first outer diameter for filtering dust particles and a filter basket for the internal stabilization and fastening of the filter bag. A connecting region arranged on a perforated filter plate for connecting the filter bag and/or the filter basket to the filter installation. The connecting region includes a cutout for the filter bag. The filter bag includes at one end at least one snap ring for the connection to the connecting region, and has a second outer diameter in the region of the snap ring. The filter basket includes at its upper end at least two spring elements for connection to the connecting region. The snap ring is elastically deformable and can be brought into at least a first shape, the cross-sectional area whereof is smaller than an area of the inner cross-section of the cutout of the perforated filter plate.

The invention relates to a filter bag (1) for pocket air filters having two abutting side parts (2, 3) which are made of an air-permeable filter material that is weldable by ultrasound. The side parts (2, 3) are continuously welded to one another in side edge portions (4) on three sides (5, 6, 7) of the side parts (2, 3), so that, by way of the two side parts (2, 3) welded together, a pocket (8) having two opposite side edges (9, 10), a bottom edge (11) and an opening (12) opposite said bottom edge (11) is formed. Several webs (13) made from a flexible material web (14) are formed in the pocket (8). The webs (13) connect the side parts (2, 3) to one another and are orientated from an opening side (15) of the filter bag (1) in the direction of the bottom edge (11). The flexible material web (14) is alternately connectedat least in portionsto one of the side parts (2, 3) in each case in weld portions (16). The weld portions (16) are delimited by at least one weld across the direction of flow (18) so that the flexible material web (14) is connected in a weld portion (16) in each case exclusively with one side part (2, 3). The webs (13) are formed by web portions (19) of the flexible material web (14). The web portions (19) run, in each case, between two adjacent weld portions (16), by which the flexible material web (14) is connected to the two opposite side parts (2, 3). In each case, a web portion width (20) of the web portions (19) defined by a length of a web portion (19) between the side parts (2, 3) decreases from the opening side (15) towards the bottom edge (11). A weld portion width (21) of at least one weld portion (16) increases at least in portions from the opening side (15) in the direction of the bottom edge (11).

Embodiments herein relate to monitoring systems that can learn patterns of filtration system operation and then use the learned patterns to monitor ongoing filtration system operation/performance. In a first aspect, a monitoring system for an air filtration system is included having a control circuit, and a pressure sensor, wherein the pressure sensor is in electronic communication with the control circuit. The monitoring system can be configured to store data reflecting signals of the pressure sensor, evaluate the stored data representing a first time period to derive a valve operating pattern, and compare data from the pressure sensor obtained after the first time period against the derived valve operating pattern to identify an abnormal valve event.

Air filter systems, filter bag assemblies, filter bags and corresponding methods are described herein. Air filter systems, filter bag assemblies, filter bags and corresponding methods are described herein. The filter bag assemblies include a flange assembly, a cage attached to the flange assembly, and a filter bag installed over the cage with an opening at the flange assembly. When installed in the dirty air chamber of the air filter system, a seal between the flange assembly and the tubesheet defining the dirty air chamber is provided by applying a seal force on the end of the filter bag assembly located proximate the access panel on the side of the dirty air chamber opposite the tubesheet. That seal force is transmitted to the flange assembly through the cage. The tubular filter bags may be in the form of triangular bags and/or may include bag support connectors at the closed end of the bag.