WO2000027610A1 - Method and device for discontinuous delivery of extruded sections of fibre-reinforced polymer materials - Google Patents

Method and device for discontinuous delivery of extruded sections of fibre-reinforced polymer materials Download PDF

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Publication number
WO2000027610A1
WO2000027610A1 PCT/EP1999/008583 EP9908583W WO0027610A1 WO 2000027610 A1 WO2000027610 A1 WO 2000027610A1 EP 9908583 W EP9908583 W EP 9908583W WO 0027610 A1 WO0027610 A1 WO 0027610A1
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WO
WIPO (PCT)
Prior art keywords
extruder
polymer
closure
fiber
strand
Prior art date
Application number
PCT/EP1999/008583
Other languages
German (de)
French (fr)
Inventor
Helmut Nägele
Jürgen Pfitzer
Frank Henning
Peter Eyerer
Norbert Eisenreich
Peter Elsner
Wilhelm Eckl
Stefan TRÖSTER
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO2000027610A1 publication Critical patent/WO2000027610A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/687—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having projections with a short length in the barrel direction, e.g. pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/45—Axially movable screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts

Definitions

  • the invention relates to a method for discontinuously depositing strand sections of fiber-reinforced polymer masses plasticized in a closed extruder, the fibers and / or the polymer masses consisting at least in part of fractions of natural materials.
  • the strand deposition process is known, inter alia, for the processing of polymer masses into shaped articles of any kind.
  • the largely dry polymer components, to which fibers for stabilization and increased strength are usually added, are fed into the feed of an extruder and plasticized in the heated extruder by means of the extruder screw.
  • the extruder remains closed until the desired degree of plasticization is reached.
  • the extruder is opened downstream of the extruder screw and the plasticized mass in the form of a strand section is released directly into a press mold, the tools of which have the contour of the desired shaped body.
  • the press is also usually heated.
  • the strand laying process is the method of choice if the fiber-reinforced polymer mass cannot be processed by injection molding, be it because, for example, the fiber content is high, the fibers are long or brittle, or if the polymer or components contained therein are treated carefully, in particular the polymer should not be converted into the molten state.
  • Natural fibers Even if they appear to be dry on the outside, always contain a certain amount of residual moisture, which may only be bound intercellularly.
  • Natural polymers such as lignin, casein, etc., have also recently been used to replace all or part of the synthetic polymers with their unfavorable ecological balance. These natural polymers also contain more or less large amounts of water and other liquid components that evaporate in the range of 100 ° C. Conventional extruders for strand laying are not suitable for processing the aforementioned compounds.
  • the invention is therefore based on the object of proposing a method and a device with which fiber-reinforced polymer compositions, in which the fibers and / or the polymer compositions have at least portions of natural substances, can be processed without problems on an extruder.
  • this object is achieved in that the extruder is vented during or after the plasticizing and before opening to deposit the strand section.
  • Extruders for depositing strands have a closure on their discharge side, for example in the form of a slide, which can be moved between a closed position and an open position for dispensing the strand section.
  • the closure of the extruder is now only released before the strand section is put down and then moved into its open position.
  • the extruder screw can also work against the slightly vented slide, if necessary, in order to displace accumulated gases or vapors from the plasticized mass.
  • a downward opening closure can be recommended, which therefore releases a small cross-section in the upper area of the discharge opening during ventilation.
  • a two-part design of the slide is also possible, the larger part being moved down and the smaller part, which is only used for venting the extruder, is being moved up.
  • the invention further relates to a device for performing the method, which consists of a heated extruder with a feed for the largely dry polymer and fiber components, a plasticizing screw and a delivery opening provided with a closure for a strand section of the fiber-reinforced, plasticized polymer mass.
  • a device for performing the method which consists of a heated extruder with a feed for the largely dry polymer and fiber components, a plasticizing screw and a delivery opening provided with a closure for a strand section of the fiber-reinforced, plasticized polymer mass.
  • the object of the invention is achieved in that the extruder has a vent valve on its housing.
  • venting valves can be arranged on the plasticizing section of the extruder, which in turn can be activated briefly.
  • the closure of the slide can be lifted after the plasticizing to expose a small cross-section of the discharge opening and can be brought into the open position after the pressure in the extruder has been reduced.
  • the extruder is opened in two stages by the shutter is only slightly vented until the pressure in the extruder is released. Only then is the closure moved into its opening position, which releases the full cross section, and the strand of the plasticized polymer mass is deposited.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A method for discontinuous delivery of extruded sections of fibre-reinforced polymer materials that are plasticized in a closed extruder. The fibres and/or the polymer materials are at least partially made up of natural substances. The extruder is deaerated during or after plasticizing and before opening for the delivery of the extruded sections. An extruder used to carry out said method comprises at least one deaerating opening.

Description

Verfahren und Vorrichtung zum diskontinuierlichen Ablegen von Strangabschnitten aus faserverstärktenMethod and device for discontinuously depositing strand sections from fiber-reinforced
PolymermassenPolymer masses
Die Erfindung betrifft ein Verfahren zum diskontinuierlich Ablegen von Strangabschnitten von in einem geschlossenen Extruder plastifizierten, faserverstärkten Polymermassen, wobei die Fasern und/oder die Polymer- massen wenigstens anteilig aus Anteile von Naturstoffen bestehen.The invention relates to a method for discontinuously depositing strand sections of fiber-reinforced polymer masses plasticized in a closed extruder, the fibers and / or the polymer masses consisting at least in part of fractions of natural materials.
Für die Verarbeitung von Polymermassen zu Formkörpern beliebiger Art ist u.a. das Strangablegeverfahren be- kannt. Die weitgehend trockenen Polymerkomponenten, denen in der Regel Fasern zur Stabilisierung und Festigkeitserhöhung beigefügt sind, werden in den Einzug eines Extruders aufgegeben und in dem beheizten Extruder mittels der Extruderschnecke plastifiziert . Der Extruder bleibt bis zum Erreichen des gewünschten Plastifizierungsgrades geschlossen. Ist der Plastifizierungsgrad erreicht, wird der Extruder stromabwärts der Extruderschnecke geöffnet und die plastifizierte Masse in Form eines Strangabschnittes unmittelbar in eine Preßform abgegeben, deren Werkzeuge die Kontur des gewünschten Formkörpers aufweisen. Auch die Presse ist in der Regel beheizt.The strand deposition process is known, inter alia, for the processing of polymer masses into shaped articles of any kind. The largely dry polymer components, to which fibers for stabilization and increased strength are usually added, are fed into the feed of an extruder and plasticized in the heated extruder by means of the extruder screw. The extruder remains closed until the desired degree of plasticization is reached. When the degree of plasticization is reached, the extruder is opened downstream of the extruder screw and the plasticized mass in the form of a strand section is released directly into a press mold, the tools of which have the contour of the desired shaped body. The press is also usually heated.
Das Strangablegeverfahren ist das Verfahren der Wahl, wenn die faserverstärkte Polymermasse nicht durch Spritzgießen verarbeitet werden kann, sei es, weil beispielsweise der Faseranteil hoch, die Fasern lang oder brüchig sind, oder wenn das Polymer oder darin enthaltene Komponenten schonend behandelt werden, insbesondere das Polymer nicht in den schmelztlüssigen Zustand überführt werden soll .The strand laying process is the method of choice if the fiber-reinforced polymer mass cannot be processed by injection molding, be it because, for example, the fiber content is high, the fibers are long or brittle, or if the polymer or components contained therein are treated carefully, in particular the polymer should not be converted into the molten state.
Der Einsatz von Naturfasern gewinnt zunehmend an Bedeutung. Naturfasern enthalten, selbst wenn sie einen äußerlich trocken erscheinenden Zustand haben, stets eine gewisse Restfeuchte, die gegebenenfalls auch nur inter- cellular gebunden ist. Ebenso werden in jüngerer Zeit Naturpolymere verarbeitet, wie Lignin, Casein etc., um die synthetischen Polymere mit ihrer ungünstigen Ökobi- lanz ganz oder teilweise zu ersetzen. Auch diese Naturpolymere enthalten mehr oder minder große Anteile an Wasser und anderen flüssigen Bestandteilen, die im Be- reich von 100°C verdampfen. Herkömmliche Extruder zum Strangablegen sind für die Verarbeitung vorgenannter Compounds nicht geeignet .The use of natural fibers is becoming increasingly important. Natural fibers, even if they appear to be dry on the outside, always contain a certain amount of residual moisture, which may only be bound intercellularly. Natural polymers, such as lignin, casein, etc., have also recently been used to replace all or part of the synthetic polymers with their unfavorable ecological balance. These natural polymers also contain more or less large amounts of water and other liquid components that evaporate in the range of 100 ° C. Conventional extruders for strand laying are not suitable for processing the aforementioned compounds.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung vorzuschlagen, mit dem faserverstärkte Polymermassen, bei denen die Fasern und/oder die Polymermassen zumindest Anteile aus Naturstoffen aufweisen, problemlos auf einem Extruder verarbeitet werden können. In verfahrenstechnischer Hinsicht wird diese Aufgabe dadurch gelöst, daß der Extruder während oder nach dem Plastifizieren und vor dem Öffnen zum Ablegen des Strang- abschnitts entlüftet wird.The invention is therefore based on the object of proposing a method and a device with which fiber-reinforced polymer compositions, in which the fibers and / or the polymer compositions have at least portions of natural substances, can be processed without problems on an extruder. In terms of process engineering, this object is achieved in that the extruder is vented during or after the plasticizing and before opening to deposit the strand section.
Beim Extrudieren solcher faserverstärkten Polymermassen in einem Extruder werden Temperaturen oberhalb 100°C und - je nach Art des Polymers - bis über 200°C erreicht. Bei diesen Temperaturen werden die in Naturstoffen enthaltenen Flüssiganteile vergast oder verdampft, was zu einem entsprechenden Druckaufbau im Extruder führt . Dieser Druck wird nicht oder allenfalls nur teilweise durch Rückströmung über den Einzug abgebaut . Insbesondere im austragsnahen Bereich des Extruders können sich hohe Druckspitzen aufbauen. Diese werden erfindungsgemäß dadurch abgebaut, daß der Extruder während oder nach dem Plastifizieren entlüftet und erst anschließend zur Abgabe des Strangabschnittes geöffnet wird. Damit wird Lunker- Einschlüssen von Gas oder Dampf vorgebeugt und wird insbesondere auch jedes sicherheitstechnische Risiko ausgeschaltet .When extruding such fiber-reinforced polymer masses in an extruder, temperatures above 100 ° C and - depending on the type of polymer - up to over 200 ° C are reached. At these temperatures, the liquid components contained in natural substances are gasified or evaporated, which leads to a corresponding build-up of pressure in the extruder. This pressure is not, or at most only partially, reduced by backflow through the intake. High pressure peaks can build up, particularly in the area of the extruder close to the discharge. According to the invention, these are broken down by venting the extruder during or after plasticizing and only then opening it to dispense the strand section. This prevents blowholes from being trapped by gas or steam and in particular also eliminates any safety-related risk.
Extruder zum Strangablegen weisen an ihrer Abgabeseite einen Verschluß, z.B. in Form eines Schiebers, auf, der zwischen einer Schließstellung und einer Öffnungstellung zur Abgabe des Strangabschnittes bewegbar ist . Erfindungsgemäß wird nun der Verschluß des Extruders vor dem Ablegen des Strangabschnittes lediglich gelüftet und anschließend in seine Öffnungsstellung bewegt. Dabei kann die Extruderschnecke gegenbenenfalls noch gegen den geringfügig gelüfteten Schieber arbeiten, um angesammelte Gase oder Dämpfe aus der plastifizierten Masse zu verdrängen. In Fällen, in denen sich Dampf oder Gas über- wiegend im oberen Teil des Extrudergehäuses sammelt, was von der Schneckengeometrie und der Verweilzeit der Masse im Extruder abhängt, kann sich ein nach unten öffnender Verschluß empfehlen, der also beim Lüften einen kleinen Querschnitt im oberen Bereich der Abgabeöffnung freigibt . Auch eine zweiteilige Ausführung des Schiebers kommt in Frage, wobei der größere Teil nach unten bewegt und der kleinere Teil, der nur dem Entlüften des Extruders dient, nach oben bewegt wird.Extruders for depositing strands have a closure on their discharge side, for example in the form of a slide, which can be moved between a closed position and an open position for dispensing the strand section. According to the invention, the closure of the extruder is now only released before the strand section is put down and then moved into its open position. The extruder screw can also work against the slightly vented slide, if necessary, in order to displace accumulated gases or vapors from the plasticized mass. In cases where steam or gas overlap Weighing in the upper part of the extruder housing, which depends on the screw geometry and the residence time of the mass in the extruder, a downward opening closure can be recommended, which therefore releases a small cross-section in the upper area of the discharge opening during ventilation. A two-part design of the slide is also possible, the larger part being moved down and the smaller part, which is only used for venting the extruder, is being moved up.
Die Erfindung betrifft ferner eine Vorrichtung zur Durchführung des Verfahrens, die aus einem beheizten Extruder mit einem Einzug für die weitgehend trockenen Polymer- und Faserkomponenten, einer Plastifizierungsschnecke und einer mit einem Verschluß versehenen Abgabeöffnung für einen Strangabschnitt aus der faserverstärkten, plastifi- zierten Polymermasse besteht. Bei einer solchen Vorrichtung wird die Erfindungsaufgabe dadurch gelöst, daß der Extruder an seinem Gehäuse ein Entlüftungsventil auf- weist.The invention further relates to a device for performing the method, which consists of a heated extruder with a feed for the largely dry polymer and fiber components, a plasticizing screw and a delivery opening provided with a closure for a strand section of the fiber-reinforced, plasticized polymer mass. In such a device, the object of the invention is achieved in that the extruder has a vent valve on its housing.
Je nach Art der verarbeiteten Polymermassen, insbesondere bei Naturpolymeren, oder der Art der Fasern, insbesondere Fasern mit hohem Feuchtegehalt, können auf der Plastifi- zierungsstrecke des Extruders gegebenenfalls mehrere Entlüftungsventile angeordnet sein, die wiederum kurzzeitig aufgesteuert werden können.Depending on the type of polymer masses processed, in particular in the case of natural polymers, or the type of fibers, in particular fibers with a high moisture content, several venting valves can be arranged on the plasticizing section of the extruder, which in turn can be activated briefly.
Vorzugsweise jedoch ist der Verschluß des Schiebers nach dem Plastifizieren unter Freigabe eines geringen Querschnitts der Abgabeöffnung lüftbar und nach Druckabbau im Extruder in die Öffnungsstellung bringbar.Preferably, however, the closure of the slide can be lifted after the plasticizing to expose a small cross-section of the discharge opening and can be brought into the open position after the pressure in the extruder has been reduced.
Die Öffnung des Extruders erfolgt also zweistufig, indem der Verschluß zunächst nur geringfügig gelüftet wird, bis der Druck im Extruder abgebaut ist . Erst anschließend wird der Verschluß in seine den vollen Querschnitt freigebende OffnungsStellung bewegt und der Strang aus der plastifizierten Polymermasse abgelegt. The extruder is opened in two stages by the shutter is only slightly vented until the pressure in the extruder is released. Only then is the closure moved into its opening position, which releases the full cross section, and the strand of the plasticized polymer mass is deposited.

Claims

Patentansprüche claims
Verfahren zum diskontinuierlichen Ablegen von Strangabschnitten von in einem geschlossenen Extruder plastifizierten, faserverstärkten Polymermassen, wobei die Fasern und/oder die Polymermassen wenigstens anteilig aus Naturstoffen bestehen, dadurch gekennzeichnet, daß der Extruder während oder nach dem Plastifizieren und vor dem Öffnen zum Ablegen des Strangabschnitts entlüftet wird.Process for the discontinuous deposition of strand sections of fiber-reinforced polymer masses plasticized in a closed extruder, wherein the fibers and / or the polymer masses consist at least partly of natural substances, characterized in that the extruder is vented during or after the plasticization and before opening to deposit the strand section becomes.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Verschluß des Extruders vor dem Ablegen des Strangabschnitts gelüftet und anschließend in seine Öffnungsstellung bewegt wird.Method according to Claim 1, characterized in that the closure of the extruder is released before the strand section is put down and then moved into its open position.
Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 bestehend aus einem beheizten Extruder mit einem Einzug für die weitgehend trockenen Polymer- und Faserkomponenten, einer Plastifizierungsschnecke und einer mit einem Verschluß versehenen Abgabeöffnung für einen Strangabschnitt aus der faserverstärk- ten, plastifizierten Polymermasse, dadurch gekennzeichnet, daß der Extruder wenigstens eine steuerbare Entlüftungsöffnung aufweist.Device for performing the method according to claim 1 consisting of a heated extruder a feeder for the largely dry polymer and fiber components, a plasticizing screw and a delivery opening provided with a closure for a strand section of the fiber-reinforced, plasticized polymer mass, characterized in that the extruder has at least one controllable ventilation opening.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Extruder an seinem Gehäuse wenigstens ein4. The device according to claim 3, characterized in that the extruder at least one on its housing
Entlüftungsventil aufweist.Has vent valve.
5. Vorrichtung nach Anspruch 3 zur Durchführung des Verfahrens nach Anspruch 2, dadurch gekennzeichnet, daß der Verschluß des Schiebers nach dem Plastifizieren unter Freigabe eines geringen Querschnitts der Abgabeöffnung lüftbar und nach Druckabbau im Extruder in die Öffnungsstellung bringbar ist . 5. Apparatus according to claim 3 for carrying out the method according to claim 2, characterized in that the closure of the slide can be released after plasticizing with the release of a small cross-section of the discharge opening and after pressure reduction in the extruder can be brought into the open position.
PCT/EP1999/008583 1998-11-11 1999-11-09 Method and device for discontinuous delivery of extruded sections of fibre-reinforced polymer materials WO2000027610A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19852030A DE19852030A1 (en) 1998-11-11 1998-11-11 Method and device for discontinuously depositing strand sections from fiber-reinforced polymer masses
DE19852030.1 1998-11-11

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WO2000027610A1 true WO2000027610A1 (en) 2000-05-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0426024A2 (en) * 1989-10-31 1991-05-08 E.I. Du Pont De Nemours And Company Process for incorporating organic fibrous fillers in elastomers
DE4331747A1 (en) * 1993-09-20 1995-03-23 Wuenning Paul Extruded, fiber-reinforced natural material granulate for thermoplastic processing, and process for its production
WO1998006785A1 (en) * 1996-08-12 1998-02-19 Jakob Silbiger Biodegradable composition
US5798128A (en) * 1995-05-16 1998-08-25 ECIA--Equipements et Composants Pour L'Industrie Automobile Plant for manufacturing structural components made of fibre-reinforced thermoplastic
DE19735809A1 (en) * 1997-08-18 1999-02-25 Basf Ag Production of amino plastics and phenolic plastics

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0426024A2 (en) * 1989-10-31 1991-05-08 E.I. Du Pont De Nemours And Company Process for incorporating organic fibrous fillers in elastomers
DE4331747A1 (en) * 1993-09-20 1995-03-23 Wuenning Paul Extruded, fiber-reinforced natural material granulate for thermoplastic processing, and process for its production
US5798128A (en) * 1995-05-16 1998-08-25 ECIA--Equipements et Composants Pour L'Industrie Automobile Plant for manufacturing structural components made of fibre-reinforced thermoplastic
WO1998006785A1 (en) * 1996-08-12 1998-02-19 Jakob Silbiger Biodegradable composition
DE19735809A1 (en) * 1997-08-18 1999-02-25 Basf Ag Production of amino plastics and phenolic plastics

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