Abstract: Apparatus for filtering heat-softened plastic material under pressure of extrusion comprising a substantially continuous screen with screw means for positively moving the same past the filtering area, said screw means being located in a passage open to the fluid plastic material, with means to harden the plastic material in the passage into a nut in which the filter is embedded. The screw means also functions to prevent the solidified slug (nut) from escaping, preventing leakage.

Abstract: A T connection including a body and a pair of aligned laterally extending projections form fluid passage means. An annular flange is formed on one of the lateral projections internally thereof and a flange is formed on the other lateral projection externally. A hollow annular filter member is positioned in the lateral projections and abuts the internal flange at one end and is closed off at the other end by the external flange on the other lateral projection. The filter member includes a core formed of generally trapezoidal or triangular shaped metal wire or strip material which has in the trapezoidal form two parallel surfaces joined by converging side surfaces. The strip material is either helically wound to form coils or formed by a plurality of rings which are longitudinally spaced a predetermined amount and a plurality of circumferentially spaced reinforcing ribs are secured to the periphery of the core.

Abstract: A screen changer having a replacement strainer plate in sealing engagement with a sealing plate and grooves in the engaged surfaces of the strainer plate and the sealing plate for communicating extruded material from the changer opening to the central strainer portion of the replacement strainer for prefilling and purging the strainer of air. The grooves are closed in the storage position of the strainer plate and opened in a preliminary change position for purging the strainer. The strainer has a venting space at one side of the central strainer portion which is in communication with a vent in a cover plate for venting air from the replacement strainer as it is being prefilled with the extruded material.

Abstract: A filter system includes a path of flow for a flowable material to be filtered and a continuous filter element moveable transversely to such flow. The continuous filter element passes through a channel of predetermined and uniform cross section and carries a plurality of seal members at intervals along its length, each seal member being of the same cross sectional size and shape as the channel so as to form moving seals within the channel. The filter member is moved continuously or on demand through the channel, presenting a continuously renewed filter area to the flowable material. The new filter system is illustrated for filtering in the plastics industry.

Abstract: A vertical upper inlet duct adapted to be connected to an upper section of a downspout or conductor leads downward through the upper wall of an open-ended horizontal box-shaped housing with a tapered bottom wall converging to a downwardly-tapered vertical outlet duct. The latter connects with a lower section of the downspout or conductor. A screen or grating is inserted in the box-shaped housing over the outlet therefrom, which may be cleaned of leaves or other water-borne trash collecting thereon by the user inserting his hand through either of the open ends of the housing. The screen itself is also similarly removable for cleaning.

Abstract: A filtration assembly useful in a household water-chilling system and having a filter with concentric cylindrical activated-charcoal elements supported between inner and outer porous plastic tubes. The filter is contained in a housing having a cover with radiused inlet and outlet ports. A coupling or adapter block having captive O-rings seals mates with the cover ports to conduct water through the filter. The block and cover are self aligning, and are positioned so no vertical clearance space is required to separate the filtration assembly from the block when the filter is serviced.

Abstract: A filter device particularly directed to the straining of materials for coating paper products which device is provided with a tapered baffle element to particularly aid in the back flushing of the filter to provide cleaning thereof and said baffle having a plurality of arcuately spaced fin members thereon for supporting of a filter element thereabout. This filter element is formed of a replaceable material having a plurality of apertures therethrough which material is normally non self supporting and which material gains its filtering support and positioning by the finned structure which will support the filtering element in both the normal filter operation and the back wash operation.