Gneuss Gmbh

Gneuss Kunststofftechnik Gmbh

Other

Daniel Gneuss

Stephan Gneuss

Detlef Gneuss

Frank Van Lück

An extruder screw for a multi-screw extruder, having an intake and metering section. A rotor body has an enlarged diameter relative to the intake and metering section and has a plurality of satellite screws positioned on the outer periphery of the rotor body at least over part of the length thereof. A cone and an adjoining drive zone are formed between the intake and metering section and the rotor body, in which drive zone the satellite screws each engage via a drive pinion in an external toothing on the rotor body or in an internal toothing on a stator ring or in the inner wall of an extruder housing. At least one peripherally closed flow channel is formed, which flow channel extends from an inlet opening on the cone to an outlet opening located downstream of the drive pinions in the direction of flow.

Extruder screw for a multi-screw extruder

For the production of polymers in which there are fillers with particle sizes below 10 μm incorporated and homogeneously distributed, a polymer starting material is input into a twin-screw extruder and is melted there to give a melt. In a conveying and mixing section, a suspension, which is formed of the fillers and of a carrier liquid, is injected into the melt. The melt viscosity is reduced by injection of the carrier liquid in the conveying and mixing section in that a cleavable polycondensate is used as polymer and low-molecular-weight cleavage product arising during the polycondensation is used as carrier liquid, and therefore the molten polymer is at least to some extent depolymerized within the conveying and mixing section. That the mixture, which is formed of the melt whose viscosity is reduced by cleavage, of the remainder of the carrier liquid and of the fillers, is homogenized.

Method for producing polymers in which fillers are incorporated and homogeneously distributed

An extruder for the viscosity-increasing preparation of meltable polymers, wherein an extruder screw with at least one helical extruder screw flight is positioned in a housing having an inner housing recess. A diameter central region has a larger outer diameter than at least one of the other diameter regions, and a conical transition is formed in each case between regions of different diameters. Two degassing zones are provided in the diameter central region, each of which has at least one associated suction opening in the housing, one degassing zone being designed in the region of the satellite screws and an additional degassing zone being designed upstream thereof in the flow direction. The thread depth of the screw threads, formed between the extruder screw flights is greater in both degassing zones than in at least one sealing and compression section formed therebetween.

Extruder having extruder screw with multiple degassing zones and diameters for the viscosity-increasing processing of meltable polymers

A multiport valve unit for medium- to high-viscosity fluids having a housing comprising at least: an inlet plate having at least one main flow channel, an outlet plate having at least one main flow channel, and at least one secondary flow channel. At least one intermediate plate and/or at least one spacer element are located between the inlet plate and the outlet plate. The multiport valve unit also has at least one switching element mounted pivotably or rotatably in the housing, which switching element is located between the inlet plate and the outlet plate, and, in a starting position, connects the main flow channels to one another via at least one passage opening.

Multiport valve unit for plastic melts and other medium- to high-viscosity liquids

A degassing extruder having a multi-screw unit, which degassing extruder comprises a housing having a feed region having a feed opening, an inner housing recess having an extraction opening extending as far as the outside and an outlet region having an outlet opening. The multi-screw unit rotatably arranged in the housing recess comprises: a rotor element having a main screw web extending over the outer circumference of a rotor shaft core, and a rotationally driven satellite screw, which is mounted in a receiving groove on the rotor element, which receiving groove extends at least along part of the length of the multi-screw unit. At least in the region of the extraction opening, the main screw web above the receiving groove has an respective opening recess for leading the satellite screw through.

Degassing extruder having a multi-screw unit and method for degassing polymer melts therewith

A filtering device for highly viscous media, in which filtering device a rotatably mounted screening wheel which has a plurality of screening cavities is arranged between a front housing element and a rear housing element. According to the invention, a plurality of screening cavities lying beside one another, through which flow can pass jointly, are combined into at least one filter group. To this end, on both sides beside the filter group, a closed blocking segment is provided on the screening wheel which segment, when positioned in associated blocking regions of the housing, is sealed off with respect to the housing elements on both sides of the screening wheel. The blocking regions in the housing are in each case larger than or as large as a screening cavity together with a sealing web surrounding the same.

Filtering device for highly viscous media

The invention relates to a filter device for a plastic melt or another highly viscous fluid, comprising a housing with an inlet plate and a discharge plate. At least one spacing element and a screen wheel which can be rotated by a drive device are arranged between the inlet plate and the discharge plate. The inlet plate and the discharge plate are clamped against each other with the inclusion of the spacing element via at least three housing clamping elements. An engagement point of the drive device on the screen wheel is arranged outside of the pretensioning surface. When viewed in the rotational direction, an angle &#x3b1; larger than 110&#xb0; and smaller than 160&#xb0; is formed on the screen wheel between a first line that extends between the pretensioning surface centroid on which a resulting frictional force Facts and the center of the screen wheel and a second line between the center and the engagement point on which an advancing force Fv acts.

Filter device for a plastic melt or another highly viscous fluid

On a rotary screen filtering device for medium to high-viscosity fluids, which comprises a rotary screen mounted for rotation in a housing, which screen has at least one screen element through which fluid can flow, the rotary screen, in the region of its sealing faces and the intermediate plates are fabricated or machined together so that they are of identical height. A gap width compensation layer is then inserted between the inlet plate and the intermediate plate and/or between the outlet plate and the intermediate plate. The package of plates is then pretensioned by means of screw bolts in such a manner that all the plates lie firmly against one another up to a maximum permissible operating pressure. Lubrication gaps of defined width are created between the sealing faces and the opposing inner faces of the inlet and outlet plates.

Rotary screen filtering device for medium to high-viscosity fluids and sealing and mounting method therefor

An extruder screw for a multi-screw extruder for plastics extrusion includes: a feeding and metering zone for melting and homogenizing the plastic and an evacuating zone for carrying away gaseous constituents and a compressing and/or discharging zone; a multi-screw section, which has a plurality of planetary screws, which lie open on the outer circumference of the extruder screw, at least over part of their length; and a driving zone, in which the planetary screws engage by way of a toothing in an external toothing on a central shaft or in an internal toothing in a stator ring or in the inner wall of an extruder bore of the multi-screw extruder. The feeding and metering zone extends into the multi-screw section, wherein the respective part of the planetary screws that is lying in the metering zone is at least partially enclosed.

Extruder screw for a multi-screw extruder for plastics extrusion

A method and an extrusion device for producing a foamed body. A plastics melt is produced inside the casing of a first extruder. The plastics melt is conveyed to an outlet die of a second extruder. The conveyed plastics melt has a foaming agent and expands after being fed through the outlet die. Before the plastics melt is fed through the outlet die, variations in temperature between different radial positions over the cross-section of the plastics melt are reduced by an extruder screw device which has a number of screw spindles distributed around the periphery. The plastics melt which is thus thermally homogeneous is fed through the outlet die.

Method for producing a foamed body by extrusion and extrusion device for producing a foamed body

The aim is to refine a method of establishing a predetermined viscosity when recycling polyester wastes having inherently different viscosities in such a way that the desired final material has the appropriate viscosity after a fairly short time, and with little energy consumption, and the color of the melt is also to be influenceable. To this end, it is proposed that the polyester wastes are melted in a first zone () of an extruder () and the polyester wastes, due to the moisture introduced with them, undergo hydrolytic degradation, in a second zone () of the extruder () polycondensation takes place and hydrolytic degradation is counteracted and equalization of the viscosity differences is started, in a third zone () of the extruder () a solvent such as water or alcohol is added such that hydrolytic and/or glycolytic degradation of the melt take(s) place and result(s) in uniform viscosity of the melt, in a fourth zone () of the extruder () active mixing of the melt takes place and the melt is transferred from the extruder () into a polycondensation reactor (), and the final desired viscosity of the melt is set in the polycondensation reactor ().

Method of establishing predetermined viscosities when recycling polyester waste

A method and an apparatus for operating a screening wheel filter for high-viscosity melts with pressures of &#x3e;10 bar and temperatures of &#x3e;90&#xb0; C., wherein a screening wheel () is rotationally driven step by step, and screening inserts () arranged in the screening wheel () are successively subjected to a stream of cleaning agent produced by a cleaning agent drive () in a backflushing cleaning station, are to be optimized in such a way that less cleaning agent is used, better cleaning of the screening inserts takes place and a saving of energy is ensured. For this purpose it is proposed that the cleaning backflushing in the backflushing cleaning station takes place during the rotation of the screening wheel (), wherein an open-loop or closed-loop control device () assigned to the cleaning agent drive () is used to set the amount of cleaning agent and/or the pressure of the cleaning agent and/or the flow rate of the cleaning agent in dependence on the rotational speed of the screening wheel () and/or in dependence on a differential pressure prevailing at the screening inserts () located in the melt channel () and the effective opening of the slot die normal to the radial is less than the distance covered by the screening wheel () during a driving step.

Method and apparatus for operating a screening wheel filter

The invention relates to a device for producing polymers, preferably for processing and polycondensation of polyester, having a substantially cylindrical reactor (), which has an inlet opening () on one side and an exit opening () on the other side and an outlet () for discharging gases. According to the invention, said device is developed such that the device has a compact design, and such that the device allows the use of higher-viscosity initial substances, even when generating smaller volumes, which is optimally adjustable in respect of the process conditions thereof and which represents a variable, cost-effective solution. According to the invention, the reactor () has a continuous, central shaft (), on which agitating elements or agitating elements and conveying elements are arranged, the inlet opening () is connected to an entry extruder (), the shaft () of the reactor and the shaft () of the entry extruder () form a common shaft (), and a drive () for the common shaft () is allocated to the entry extruder ().

Apparatus for making polymers

The invention relates to a method and a device for operating a screen wheel filter for highly viscous melts having pressures &#x3e;10 bar and temperatures &#x3e;90&#xb0; C. which shall be further developed in such a way that less of the highly viscous melt is wasted and that the operation of the screen wheel filter can be made more economical. For this purpose the screen wheel () according to the invention is rotationally driven at least one complete revolution, with respect to one of the screen inserts () located in the melt channel (), before the particular screen insert () is replaced and/or backflushed, and wherein the drive speed and drive cycling for the screen wheel () are set in dependence on the thermal or oxidative decomposition behavior of the particular melt in such a way that, when the particular screen insert () reenters the melt channel () of the screen wheel filter (), the melt remaining in the particular screen insert () has experienced thermal decomposition or oxidative decomposition of &#x2266;3% cleaved molecular chains, preferably &#x2266;1% cleaved molecular chains.

Method and device for operating a screen wheel filter

An extruder has an intake barrel, a degassing drum connected to, downstream from, and coaxial with the intake barrel, and an output barrel connected to, downstream from, and coaxial with the intake barrel and degassing drum. A driven shaft extends through the drum and barrels and is rotated for forming a plastic melt and advancing the melt through the intake barrel, degassing drum, and output barrel. A plurality of degassing screws surround the driven shaft in the degassing drum. A screw guide rotationally fixed to the shaft has respective seats for the degassing screws. Respective drive gears rotationally fixed but removably mounted on the degassing screws are received in respective seats in a gear guide separate from the screw guide and rotationally fixed to the shaft. A ring gear is rotationally fixed but removably mounted in the degassing drum and meshes with the drive gears.

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Charlotte, NC, United States of America

Daniel Gneuss