DE2649267C2 - Process for the production of metal fiber reinforced plastic semi-finished and finished products - Google Patents

Process for the production of metal fiber reinforced plastic semi-finished and finished products

Info

Publication number
DE2649267C2
DE2649267C2 DE2649267A DE2649267A DE2649267C2 DE 2649267 C2 DE2649267 C2 DE 2649267C2 DE 2649267 A DE2649267 A DE 2649267A DE 2649267 A DE2649267 A DE 2649267A DE 2649267 C2 DE2649267 C2 DE 2649267C2
Authority
DE
Germany
Prior art keywords
plastic
finished
tool
production
metal fibers
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
DE2649267A
Other languages
German (de)
Other versions
DE2649267A1 (en
Inventor
Walter Dipl.-Ing. Damsky
Egon Lemmen
Dietrich Dr. Michael
Helmut Dipl.-Ing. 4150 Krefeld Winchenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
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.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Priority to DE2649267A priority Critical patent/DE2649267C2/en
Publication of DE2649267A1 publication Critical patent/DE2649267A1/en
Application granted granted Critical
Publication of DE2649267C2 publication Critical patent/DE2649267C2/en
Expired legal-status Critical Current

Links

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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
    • B29C70/882—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
    • 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
    • B29C48/03—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
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0005—Conductive

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Kunststoffhalbzeugen und -fertigprodukten mit hoher elektrischer und/oder thermischer Leitfähigkeit aus Kunststoff und Metallfasern, wobei der feste Kunststoff in einer Schneckenpresse mit feinen, einzelnen Metallfasern gemischt und als plastische oder flüssige Mischung in ein Werkzeug befördert wird, worin die Mischung dann erstarrt (GB-PS 8 44 939).The invention relates to a method for the production of plastic semi-finished and finished products with high electrical and / or thermal conductivity made of plastic and metal fibers, the solid plastic mixed in a screw press with fine, individual metal fibers and as a plastic or liquid mixture is conveyed into a tool, in which the mixture then solidifies (GB-PS 8 44 939).

Es ist bekannt, daß Kunststoffteile mit elektrischer und/oder thermischer Leitfähigkeit dadurch hergestellt werden können, daß man ein zusammenhängendes räumliches Gebilde aus Metallfasern (Schwamm) in eine Form einlegt und anschließend diese Form mit plastischer Kunststoffschmelze füllt.It is known that plastic parts with electrical and / or thermal conductivity are thereby produced can be that you have a cohesive spatial structure of metal fibers (sponge) in a Insert the mold and then fill this mold with plastic melt.

Ein Nachteil dieses Verfahrens ist die nicht fixierte Lage des Metallschwammes in der Form und die damit verbundene schlechte Reproduzierbarkeit der Formteileigenschaften. Insbesondere wird der Schwamm beim Einfüllen der Kunststoffschmelze in der Form zusammengedrückt und in Fließrichtung der Schmelze verschoben. Dabei geht zum Teil der Kontakt des Metallschwammes mit der formgebenden Wandung verloren. An diesen Stellen bildet sich eine homogene Kunststoffschicht, die wegen des fehlenden Metall-Netzes weder elektrisch noch thermisch leitfähig ist und deshalb entfernt werden muß, wenn die genannten Eigenschaften gefordert sind. Auch können nur Metallschwämme mit einfacher Geometrie verarbeitet werden, so daß nach diesem Verfahren auch nur einfach geformte Formteile hergestellt werden können. Insbesondere müssen Bohrungen, Nuten und andere Ausnehmungen nachträglich in einem gesonderten Arbeitsgang gefertigt werden.A disadvantage of this method is the non-fixed position of the metal sponge in the mold and the resulting associated poor reproducibility of the molded part properties. In particular, the sponge When the plastic melt is poured in, it is compressed in the mold and in the direction of flow of the melt postponed. In this case, the contact between the metal sponge and the shaping wall is partly lost. A homogeneous layer of plastic forms at these points, which is due to the lack of a metal network is electrically still thermally conductive and must therefore be removed if the properties mentioned are required. Also, only metal sponges with simple geometry can be processed, so that this process can also be used to produce simply molded parts. In particular bores, grooves and other recesses must be subsequently produced in a separate operation will.

Auch sind einzelne oder gedrillte Fäden aus gegossenem Metall bekannt, die nach herkömmlichen Verfahren mit den Kunststoffen zusammengebracht und verarIndividual or twisted threads made of cast metal are also known, which are made by conventional methods brought together with the plastics and processed

beitet werden. ιbe worked on. ι

Durch das Gießen tritt eine Verarmung der Oberflächenschicht an metallenen Fäden ein, wodurch der Abbau von unerwünschten elektrischen Aufladungen wesentlich erschwert wird und die Gebrauchsfähigkeit leidet The casting depletes the surface layer on metal threads, which significantly reduces unwanted electrical charges becomes difficult and usability suffers

Es ist bekannt, daß Kunststoffe mit verbesserter elektrischer und/oder thermischer Leitfähigkeit dadurch hergestellt werden, daß der Kunststoff mit MetallpulverIt is known that plastics with improved electrical and / or thermal conductivity thereby be made that the plastic with metal powder

ίο gemischt wird und dieses Gemisch nach bekannten Verfahren (z. B. Spritzgießen) zu einem Fertigteil geformt wird.ίο is mixed and this mixture according to known methods (e.g. injection molding) is formed into a finished part.

Ein Nachteil dieses Verfahrens ist, daß eine merkliche Verbesserung der elektrischen und thermischen Leitfähigkeit nur dann erzielt wird, wenn zwischen den im Kunststoff eingelagerten Metall-Partikeln eine Verbindung besteht. Dazu ist jedoch ein hoher Gehalt an Metallpulver als Füllstoff erforderlich, der wiederum dann die mechanischen Eigenschaften der Fertigteile stark herabsetzt, so daß diese nicht mehr überall verwendet werden können.A disadvantage of this process is that there is a noticeable improvement in electrical and thermal conductivity is only achieved if there is a connection between the metal particles embedded in the plastic consists. However, this requires a high content of metal powder as a filler, which in turn then greatly reduces the mechanical properties of the finished parts, so that they are no longer used everywhere can be.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu finden, die die Herstellung von Halb- und Fertigerzeugnissen aus Kunststoff mit hoher elektrischer und thermischer Leitfähigkeit auch von komplizierter Form in einem Arbeitsgang ermöglicht, wobei die geforderten Eigenschaften auch im Grenzbereich der Oberfläche vorhanden sein müssen.
Diese Aufgabe wird dadurch erfindungsgemäß gelöst, daß die Mischung unter Bildung einer sekundären Grenzschichtströmung entlang rauher Werkzeugoberflächen in das Werkzeug fließt und dabei intensiv gekühlt wird.
Während der Mischung verbiegen sich die Metallfasern, vorzugsweise Kupferfasern, so daß sie ein räumliches Netzwerk bilden, welches dem Kunststoff auch schon bei wenigen Metallfasern eine ausgezeichnete elektrische und Wärmeleitfähigkeit verleiht. Überraschend ist bei dem erfindungsgemäßen Verfahren, daß durch eine so einfache technische Maßnahme, wie das Aufrauhen der Oberfläche im Werkzeug, die sich sonst bildende Verarmung der Außenschicht an Metallfasern vermieden werden kann. Elektrostatische Aufladungen werden dadurch sofort abgebaut. Durch die verbesserten Eigenschaften der nach diesem Verfahren hergestellten Produkte wird das* Einsatzgebiet des Kunststoffes unter anderem bei Rollen, Walzen, Zahnräder und Lagerschalen, insbesondere in explosionsgefährdeten Räumen, erheblich erweitert.The invention is based on the object of finding a method and a device that enables the production of semi-finished and finished plastic products with high electrical and thermal conductivity even of complex shape in one operation, the required properties also being present in the boundary area of the surface must be.
This object is achieved according to the invention in that the mixture flows into the tool with the formation of a secondary boundary layer flow along rough tool surfaces and is intensively cooled in the process.
During the mixing, the metal fibers, preferably copper fibers, bend so that they form a spatial network which gives the plastic excellent electrical and thermal conductivity even with a few metal fibers. What is surprising in the method according to the invention is that by means of such a simple technical measure as roughening the surface in the tool, the otherwise depletion of metal fibers in the outer layer can be avoided. This dissipates electrostatic charges immediately. Due to the improved properties of the products manufactured using this process, the * area of application of the plastic is considerably expanded, among other things for rollers, cylinders, gears and bearing shells, especially in areas where there is a risk of explosion.

In einer besonderen Durchführung des Verfahrens werden mehrere Kunststoffkomponenten getrennt zu einem Gegenstand verarbeitet, wovon mindestens eine Kunststoffkomponente mit Metallfasern versetzt ist.In a special implementation of the method, several plastic components are separated processed an object, of which at least one plastic component is mixed with metal fibers.

Durch die Kombination von verschiedenen Kunst-Stoffkomponenten sind die jeweils besten Materialeigenschaften bei unterschiedlichen Beanspruchungen der einzelnen Stellung des Gegenstandes und geringeren Materialkosten einsetzbar.
In einer Ausführungsform besitzt die formgebende Oberfläche des Werkzeuges eine Rauhtiefe größer als 0,05 mm.Through the combination of different synthetic material components, the best material properties can be used for different demands on the individual position of the object and lower material costs.
In one embodiment, the shaping surface of the tool has a surface roughness greater than 0.05 mm.

Die nach dem arithmetischen Mittelwert gemessene Rauhtiefe wird durch Sandstrahlen erzeugt, dadurch werden die Kunststoffteile griffiger und blendungsfrei, was oft erwünscht ist.The surface roughness measured according to the arithmetic mean is produced by sandblasting, thereby the plastic parts become easier to grip and glare-free, which is often desirable.

In einer weiteren Ausführungsform sind auf der formgebenden Oberfläche des Werkzeugs Rippen quer zur Fließrichtung angebracht.In a further embodiment, ribs are on the shaping surface of the tool transversely to the Direction of flow attached.

Durch die Rippen wird die Kühloberfläche vergrößert und damit intensiviert.The cooling surface is enlarged and thus intensified by the ribs.

In einem Ausführungsbeispiel wird die Erfindung erläutertThe invention is explained in an exemplary embodiment

In eine Schneckenspritzgießmaschine mit einem Spritzdruck von 1500 bar und einem Nachdruck von 800 bar wird bei einer Zylinderwandtemperatur von 250° C ein Gewichtsteil Polyamid und ein Gewichtsteil 0,1 mm dicke und 5 mm lange Kupferfasern eingesetzt und nach dem Plastifizieren durch eine offene Düse in eine sandgestrahlte Form mit einer Wandtemperatur von 30° C eingespritztIn a screw injection molding machine with an injection pressure of 1500 bar and a holding pressure of 800 bar becomes one part by weight of polyamide and one part by weight at a cylinder wall temperature of 250 ° C 0.1 mm thick and 5 mm long copper fibers are inserted and after plasticizing through an open nozzle in a sandblasted mold with a wall temperature of 30 ° C is injected

Das Ergebnis ist ein Formteil, dessen Oberflächenwiderstand nach DIN 53 482 unter lOOhm und der eine Wärmeleitfähigkeit von 0,54 Watt/mK besitzt.The result is a molded part whose surface resistance according to DIN 53 482 is less than lOOhm and one Has a thermal conductivity of 0.54 watt / mK.

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Claims (4)

Patentansprüche:Patent claims: 1. Verfahren zur Herstellung von Kunststoffhalbzeugen und -fertigproduicten mit hoher elektrischer und/oder termischer Leitfähigkeit aus Kunststoff und Metallfasern, wobei der feste Kunststoff in einer Schneckenpresse mit feinen, einzelnen Metallfasern gemischt und als plastische oder flüssige Mischung in ein Werkzeug befördert wird, worin die Mischung dann erstarrt, dadurch gekennzeichnet, daß die Mischung unter Bildung einer sekundären Grenzschichtströmung entlang rauher Werkzeugoberflächen in das Werkzeug befördert und dabei intensiv gekühlt wird.1. Process for the production of plastic semi-finished and finished products with high electrical and / or thermal conductivity made of plastic and metal fibers, the solid plastic in a Screw press mixed with fine, individual metal fibers and as a plastic or liquid mixture is conveyed into a tool, in which the mixture then solidifies, characterized in that, that the mixture forms a secondary boundary layer flow along rough tool surfaces is conveyed into the tool and is intensively cooled in the process. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mehrere Kunststoffkomponenten getrennt zu einem Gegenstand verarbeitet werden, wovon mindestens eine Kunststoffkomponente mit Metallfasern versetzt ist.2. The method according to claim 1, characterized in that several plastic components are separated be processed into an object, of which at least one plastic component with Metal fibers is offset. 3. Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die formgebende Oberfläche des Werkzeuges eine Rauhtiefe größer als 0,05 mm besitzt.3. Apparatus according to claim 1 and 2, characterized in that the shaping surface of the tool has a surface roughness greater than 0.05 mm. 4. Vorrichtung nach Anspruch 1, 2 und 3, dadurch gekennzeichnet, daß auf der formgebenden Oberfläche des Werkzeuges Rippen quer zur Fließrichtung angebracht sind.4. Apparatus according to claim 1, 2 and 3, characterized in that on the shaping surface of the tool ribs are attached transversely to the direction of flow.
DE2649267A 1976-10-29 1976-10-29 Process for the production of metal fiber reinforced plastic semi-finished and finished products Expired DE2649267C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2649267A DE2649267C2 (en) 1976-10-29 1976-10-29 Process for the production of metal fiber reinforced plastic semi-finished and finished products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2649267A DE2649267C2 (en) 1976-10-29 1976-10-29 Process for the production of metal fiber reinforced plastic semi-finished and finished products

Publications (2)

Publication Number Publication Date
DE2649267A1 DE2649267A1 (en) 1978-05-03
DE2649267C2 true DE2649267C2 (en) 1984-09-20

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ID=5991831

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2649267A Expired DE2649267C2 (en) 1976-10-29 1976-10-29 Process for the production of metal fiber reinforced plastic semi-finished and finished products

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916938A1 (en) * 1989-05-24 1990-11-29 Gerhard Dingler COMPONENT
DE4016953A1 (en) * 1990-05-25 1991-11-28 Itt Ind Gmbh Deutsche Electronic device with electromagnetic screening - using insulating and conductive pref. epoxy¨ resin layers

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2802236C3 (en) * 1977-05-31 1981-12-24 The General Tire & Rubber Co., 44329 Akron, Ohio Process for the production of plastic molded parts from highly viscous plastic provided with short glass fibers and a mold for carrying out the process
DE3037713A1 (en) * 1980-04-02 1982-05-13 Hans 4570 Quakenbrück Litwin Extrusion or injection mixtures contain microfibres - esp. from steel machining integrally mixed with plastics and fillers
DE59508784D1 (en) * 1995-02-27 2000-11-16 Inpro Innovations Gmbh Process for creating low-resistance contact surfaces on components made of long steel fiber-filled thermoplastics
GB2315698A (en) * 1996-07-26 1998-02-11 Harold Moore A moulded tool
BE1015316A5 (en) * 2003-01-17 2005-01-11 Ecoloc Nv OBJECT FROM PLASTIC with conductive properties and a method for manufacturing the same.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB844939A (en) * 1956-01-18 1960-08-17 Armour Res Found Metal-plastic combinations and methods for making same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916938A1 (en) * 1989-05-24 1990-11-29 Gerhard Dingler COMPONENT
DE4016953A1 (en) * 1990-05-25 1991-11-28 Itt Ind Gmbh Deutsche Electronic device with electromagnetic screening - using insulating and conductive pref. epoxy¨ resin layers

Also Published As

Publication number Publication date
DE2649267A1 (en) 1978-05-03

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