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Assignee: Werner & Pfleiderer GmbH


Location: Stuttgart, DE
No. of patents: 87

1      
NumberTitleIssue Date
5879602Apparatus and method for impregnating fibrous strands with plastic material
An apparatus for impregnating fibrous strands with plastic material as matrix material including: an impregnating core having an outer limiting surface; an impregnating shell defining a cavity therein having an inner limiting surface, the impregnating she...
03/09/1999
5874682Torque measuring device particularly for a multishaft extruder
An assembly for applying a torque from an output shaft to an input shaft of an apparatus, such as a multishaft extruder, and for measuring the applied torque. The assembly includes a connecting sleeve for torque-transmittingly coupling the output shaft wi...
02/23/1999
5797677Screw-type extruding machine having a screw element defining a groove with an expansion region at each end thereof
A screw-type extruding machine includes a housing; a driveable shaft disposed inside the housing and including a rotational moment transfer element; and at least one screw element. The screw element has two ends and defines a longitudinal groove therein f...
08/25/1998
5620130Process for producing a die plate for underwater granulation of plastic material with an intermediate nickel alloy layer
A die plate for the underwater granulation of thermoplastic material is formed with a base plate of an iron alloy, a hard annular cutting plate of titanium-carbide alloy, and an intermediate buffer layer containing nickel between the base plate and the cu...
04/15/1997
5573332Screw element for a screw-like extrusion machine
In a screw element for the conditioning and/or processing of plastics or elastomers in a screw-type extruding machine having screw shafts drivable to rotate in the same direction and at least one pair of meshing screw elements, each screw element having a...
11/12/1996
5518439Process and apparatus for the finish grinding of cutting tools of a granulating device
A process and apparatus for the finish grinding of cutting blades of a cutting tool head of a granulating device for thermoplastic material in which a grinding wheel is supported for rotation about a vertical axis with a grinding surface of the grinding w...
05/21/1996
5499869Device for adjusting the pressure of the plastic material in a screw extruder
A throttle for the adjustment of the pressure of plastic material in screw extruders in which the throttle is a cylindrical plunger submerged in the melt flow in a melt channel. In order to eliminate dead spaces downstream of the throttle, the plunger is ...
03/19/1996
5378135Apparatus for aligning the cutting surfaces of cutting blades of a granulating device
A process and apparatus for aligning the cutting surfaces of cutting blades of a granulating device, in which an abrasive plate is detachably connected to the granulating hood of the granulating device after disconnection of the hood from a die plate. The...
01/03/1995
5338112Process and apparatus for two stage treatment of plastic materials
In the preparation and production of plastic materials by a continuously operating double shaft screw-type extruder, the efficiency of production often depends on good delivery of material to the extruder. In accordance with the invention for processing v...
08/16/1994
5335991Plastic melt extruder having an adjustable throttling gap of non-uniform width
An extruder for processing plastic material has a housing with a longitudinal bore in which an extruder screw is coaxially fitted for rotation around an axis of the screw to advance plastic material through the bore by threads on the screw. A plurality of...
08/09/1994
5332308Process and apparatus for production of plastics containing additives
A process and apparatus for the production of plastic material containing an additive in which the plastic material is supplied into a mixing tank to undergo vigorous mixing therein and the mixed plastic material is discharged by an extrusion screw at the...
07/26/1994
5318358Screw kneader for plastic material having a controlling mixing section
A screw kneader for a plastic material in which a pair of longitudinal screws are rotatably mounted in respective bores for conveying plastic material through the kneader. The screws have spaced portions for advancing the plastic material from an inlet re...
06/07/1994
5310256Apparatus for mixing and processing plastic material including a delivery pump
A mixing and processing apparatus for plastic melt is equipped with a separately drivable gear pump as a delivery unit. In order to avoid material deposits between the mixing and processing apparatus and the delivery pump, the gear pump is directly mounte...
05/10/1994
5308562Recycling process and apparatus for the production of polymer from thermoplastic polycondensate
A process and apparatus for the production of a polymer of thermoplastic polycondensate in which the polymer is first treated in a screw extruder and then in a mixing tank. In the extruder the polycondensate is heated in a first zone to a temperature belo...
05/03/1994
5306132Process and apparatus for degassing plastic melt in a screw extruder
A process and a degassing unit for the degassing of plastic melt in a screw extruder in which a surface of the degassing unit facing the screws of the extruder are heated to prevent deposition of entrained plastic particles, particularly at the corners or...
04/26/1994
5297864Degassing means for a twin screw extruder for plastic materials
A twin screw extruder for processing plastic material having a housing provided with a plurality of juxtaposed housing segments arranged axially in succession and defining two longitudinal, overlapping bores respectively containing two coaxially arranged ...
03/29/1994
5242698Process and apparatus for controlling a dough making machine
Dough processing method and apparatus in which a head machine has a dough divider for producing successive dough pieces, one after the other, and a conveyor for conveying the dough pieces from the dough divider to a subsequent treatment device A first dri...
09/07/1993
5223279Granulating device for plastic compounds
A granulating device for plastic compounds in which cutting knives of a cutting device face the die plate of a granulating head to form granules of plastic strings extruded from the die plate. The cutting knives are supported on a cutting shaft driven in ...
06/29/1993
5211968Dough dividing machine
A machine for dividing dough in which a dough supply unit delivers dough under pressure at an outlet end into dividing chambers of a rotatable carrier, the carrier having double measurement pistons in the dividing chambers for selectively delivering large...
05/18/1993
5203256Continuous fermenting chamber for dough products
A continuous operation apparatus for fermenting dough products disposed on carriers which are conveyed stepwise through a fermenting chamber by vertical and horizontal conveyors. In order to obtain maximum space utilization and product density in the ferm...
04/20/1993
5187880Centrifugal dryer for separation of surface water from plastic granules
A rotor (2) surrounded by a strainer basket (3) is arranged vertically in a housing (1). Conveyor blades (7) arranged one above the other are distributed over the rotor (2) to convey plastic granules from a product inlet (14) arranged at the bottom of the...
02/23/1993
5171022Shaft seal of a mixing and kneading machine
A sealing arrangement is provided between the shaft of a mixing tool and the wall of a housing of a mixing and kneading machine, the sealing arrangement having a housing liner and a gland member which can be axially displaced against a support ring arrang...
12/15/1992
5143673Process and apparatus for underwater granulation of molten thermoplastic material particularly during start-up periods
In order to prevent solidification of melt in the openings in an orifice plate of an underwater granulator during start-up, the water discharged from the housing of the granulator is diverted to a low pressure outlet so that during start-up a ring of wate...
09/01/1992
5139345Temperature sensor for mixing and kneading machines
A temperature sensor for mixing and kneading vessels, particularly for rubber kneaders, which is sealingly mounted in an opening in a housing wall of the vessel to project into the material to be mixed and/or kneaded. A thermocouple is mounted in the meas...
08/18/1992
5098586Method for the gentle separation of granulate and water
A method for the separation of granulate and water in an after-treatment section following a granulator in which a vibrating screen receives the water and granulate mixture. In order to obtain low residual moisture without subsequent drying, the granulate...
03/24/1992
5094606Orifice plate for producing plastic strands in which a small distribution channel is provided to maintain melt flow velocity
In pelletizing apparatus, an orifice plate forms plastic strands, the orifice plate having a distributor channel at its inlet side in the form of a grooved annular inlet. A cutting plate is provided with outlet openings which are connected to the distribu...
03/10/1992
5029403Post treatment plant for plastic granules
A compact plant for the post-treatment of wet plastic granules in which a rotatable or longitudinally displaceable conveyor-separator is movable between positions in which the wet granules are selectively dewatered or diverted from flowing to a dryer. A w...
07/09/1991
4984977Screw-type extruder having a starting valve and throttle
A screw-type extruder has a housing and at least one screw which is rotatably arranged in a bore in the housing and which conveys material while melting or plasticizing in a conveying direction to a discharge channel, a starting valve and a throttle for g...
01/15/1991
4963650Process for separating low molecular weight compounds from polycaproamide melt with superheated steam
A process for separating low molecular weight compounds from a crude polycaproamide melt comprises heat treating the melt in vacuo with superheated steam, in an extruder having a plurality of degassing zones, under precise conditions of temperature, press...
10/16/1990
4938605Apparatus and method for mixing and continuous extrusion of a plastic mass
An apparatus for the mixing and continuous extrusion of a plastic mass having a first stage in which an intermittently operating mixer receives the starting materials batchwise and a second stage having a screw extruder which is supplied at periodic inter...
07/03/1990
4934916Perforated plate for the underwater granulating of plastic strands
A perforated granulating plate construction in which conically tapering inlet channels are connected to several outlet channels, the collective cross-sectional area of the outlet channels being substantially equal to the cross-sectional area at the outlet...
06/19/1990
4934201Method and apparatus for supplying samples from a melt to a rheometer
A method and apparatus for removing samples from a plastic melt for measuring the rheological properties of the plastic melt in which melt samples are removed from melt in a melt channel through a hollow probe arranged transversely of the direction of flo...
06/19/1990
4931229Method and apparatus for protecting a screw extruder producing strand-shaped explosives and propellants
A method and apparatus for protecting a mixing apparatus for producing strand-shaped explosives and propellants in a twin-shaft screw extruder, the housing of which is formed of housing parts connected to a clamping device acting under hydraulic pressure....
06/05/1990
4900156Twin screw extruder with thread-free mixing zones
Apparatus for mixing material in a twin screw extruder by longitudinally advancing material by the interengaging threads of two screws in the housing of a twin screw extruder such that a plurality of separate streams of material are advanced by the thread...
02/13/1990
4877390Degassification device for a screw extruder which processes plastic material
A degassification device for a screw extruder which processes plastic material in which the extruder has a hollow housing and an extruder screw rotatable in the housing, the degassification device having a pair of degassification screws disposed adjacent ...
10/31/1989
4863364Screw tip of an extruder screw
An extruder for the extrusion of a material composed of a mixture of substances in which an extruder screw is rotatably mounted in a feed channel of a housing for advancing the material to an outlet, of the channel whereat a screw tip is coaxially mounted...
09/05/1989
4863363Throttling device for a twin-shaft srew-type extruder
A throttling device for a twin-shaft screw-type extruder, the housing of which is provided with bores parallel to one another and passing through one another forming saddles, has a transfer channel in each bore-defining wall, which channels are in a stagg...
09/05/1989
4850835Cooling device for plastic granulate
A cooling device for plastic granulate which is formed by cutting plastic strands emerging from a nozzle plate of an extruder and is fed to a stream of cooling water which adjoins the nozzle plate in the region of a cutting device. A pipe conducts the str...
07/25/1989
4793789Dough-rounding apparatus
A dough-rounding apparatus in which first and second groups of elements undergo relative revolving movements to round pieces of dough. The elements of one group have chambers for receiving the pieces of dough, the elements of the other group being formed ...
12/27/1988
4784254Method and apparatus for increasing the number of longitudinal rows of advancing bakery articles
A method and apparatus for increasing the number of longitudinal rows of bakery articles which are being advanced on an oven conveyor belt in longitudinal and transverse rows according to which there are formed a number n of identical groups of directly a...
11/15/1988
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