Kreyenborg Gmbh

Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg

Nordson Holdings S.à R.l. & Co. Kg

Frank Hartmann

Robert Middler

Stefan Wöstmann

Christian Schröder

Michael Andress

A filtering device () for highly viscous media comprises at least one screen plug () which is movably arranged in a screen plug bore () of a housing () and which has at least one screen cavity (), a filter element () lying in said screen cavity. The screen cavity () narrows to a funnel section () in a rear region when viewed in the flow direction, said funnel section opening into at least one screen plug outlet channel that opens upstream of the housing outlet channel () in the production position. According to the invention, the screen plug outlet channel comprises an inlet zone (), at least one deflecting point (), and an outlet zone (). The intake zone () extends from an edge region of the funnel section (), and the outlet zone () is designed as a groove that extends on the outer face of the screen plug (') and/or on the inner face of the screen plug bore ().

Filtering device for highly viscous media

The invention relates to a filtering device for highly viscous fluids, having at least two parallel screen plungers which are arranged in a displaceable fashion in screen plunger bores of a housing and which have in each case at least one screen cavity in which at least one filter element is arranged, wherein the housing has an inflow opening from which, on the untreated side, at least one flow duct leads to each screen plunger bore, and the housing has at least one flow duct which, on the clean side, leads from each screen plunger bore to an outflow opening. On the untreated side and/or on the clean side, in each case one common flow duct leads rectilinearly along both screen plunger bores and, in a production position, tangentially intersects the screen cavities.

Filtering device for highly viscous fluids

The invention relates to a screen changer in a system that processes flowable plastic. The screen changer includes an element, such as a portafilter, that is movable between two positions; two hydraulic pumps that effect position change of the screen changer; and a motor that operates both pumps. One pump provides greater flow volume and the other provides a lower flow volume, but with greater pressure. A non-return valve in the supply line to the hydraulic cylinder controls flow to the cylinder that moves the movable element between positions. The volume pump is used to move the movable element when resistance to movement of the screen is low and the high-pressure pump to move the element when resistance is high. The non-return valve selectively enables or interrupts flow from the pumps to the hydraulic cylinder. The screen changer allows use of a non-pressurized hydraulic fluid reservoir.

Screen changer

A filtering device () for plastic melts exhibits at least one screen plunger () arranged movably between an inlet channel () and an outlet channel () of a housing () and containing replaceable, three-dimensional filter elements (). The inside of the filter elements () is connected to at least one melt channel () formed in the screen plunger (). The melt channel is connected to the inlet or outlet channel () of the housing () when in the production position. The screen plunger () exhibits at least one receiving chamber () that can be closed using a cover () on the face side. Several filter elements () are bundled with a central distribution element () to a filter cartridge () that can be placed in the receiving chamber ().

Growing community of inventors

Steinfurt, Germany

Frank Hartmann