DE1204385B - Process for crosslinking moldings made from peroxide-containing, electrically semiconducting polyolefin mixtures - Google Patents

Process for crosslinking moldings made from peroxide-containing, electrically semiconducting polyolefin mixtures

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Publication number
DE1204385B
DE1204385B DEF41223A DEF0041223A DE1204385B DE 1204385 B DE1204385 B DE 1204385B DE F41223 A DEF41223 A DE F41223A DE F0041223 A DEF0041223 A DE F0041223A DE 1204385 B DE1204385 B DE 1204385B
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DE
Germany
Prior art keywords
crosslinking
shaped body
peroxide
heated
moldings made
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.)
Pending
Application number
DEF41223A
Other languages
German (de)
Inventor
Dipl-Chem Hans Joa Trappenberg
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.)
Felten and Guilleaume Carlswerk AG
Original Assignee
Felten and Guilleaume Carlswerk 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 Felten and Guilleaume Carlswerk AG filed Critical Felten and Guilleaume Carlswerk AG
Priority to DEF41223A priority Critical patent/DE1204385B/en
Publication of DE1204385B publication Critical patent/DE1204385B/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/247—Heating methods
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • B29C35/14—Dielectric heating for articles of indefinite length
    • 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
    • B29C48/03—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
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3462—Cables
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

Verfahren zum Vernetzen von Formkörpern aus peroxydhaltigen, elektrisch halbleitenden Polyolefinmischungen Beim Vernetzen peroxydhaltiger Mischungen von Polyolefinen, z. B. von Polyäthylenmischungen, durch Wärmebehandlung kommt es darauf an, daß das zugesetzte Peroxyd möglichst restlos umgesetzt wird, da anderenfalls das überschüssige Peroxyd die Alterungseigenschaften des Erzeugnisses verschlechtert.Process for crosslinking moldings made of peroxide-containing, electrically semiconducting polyolefin mixtures When crosslinking peroxide-containing mixtures of Polyolefins, e.g. B. of polyethylene blends, it comes from heat treatment that the added peroxide is implemented as completely as possible, otherwise the excess peroxide impairs the aging properties of the product.

Daraus ergibt sich die Notwendigkeit, die Wärmebehandlung so zu bemessen, daß die vernetzte Masse praktisch kein Peroxyd mehr enthält. Dies stößt in der Praxis auf erhebliche Schwierigkeiten. Der Wärmeübergang auf die Mischung ist nämlich infolge der schlechten Wärmeleitfähigkeit der Polyolefine viel zu langsam, um bei vertretbarem Zeitaufwand eine hinreichendeDurchwärmung der ganzen Masse zu ermöglichen. Andererseits kann man diesen Wärmeübergang auch nicht durchKneten der Mischung beschleunigen, weil die Mischung beim fortschreitenden Vernetzen immer zäher wird und daher zum mindestens der überwiegende Teil der Vernetzung erst nach der Formgebung durchgeführt werden kann. Dies gilt für elektrisch halbleitende Polyolefinmischungen in gleicher Weise wie für Isoliermischungen aus solchen Stoffen.This makes it necessary to dimension the heat treatment in such a way that that the crosslinked mass contains practically no more peroxide. This comes across in practice to significant difficulties. The heat transfer to the mixture is a consequence the poor thermal conductivity of polyolefins is far too slow to be acceptable Time required to allow the whole mass to be sufficiently heated. on the other hand you cannot accelerate this heat transfer by kneading the mixture, because the mixture becomes more and more tenacious as the networking progresses and therefore to the at least the major part of the crosslinking is only carried out after the shaping can be. This applies equally to electrically semiconducting polyolefin mixtures Way as for insulating mixtures of such substances.

Die Erfindung bezieht sich auf das Vernetzen durch Wärmebehandlung eines Formkörpers aus einer peroxydhaltigen, elektrisch halbleitenden Polyolefinmischung, wie sie z. B. durch Zusatz von Ruß, Graphit oder Metallpulver zu dem Polyolefin erhalten werden kann. Erfindungsgemäß wird hierzu der Formkörper durch unmittelbare elektrische Widerstandserhitzung geheizt. Auf diese Weise läßt sich eine rasche und gleichmäßige Durchwärmung des Formkörpers erzielen, die einen schnellen und vollständigen Umsatz des Peroxyds in der ganzen Masse des Formkörpers zu erreichen gestattet. Die Erfindung ermöglicht es daher, bei der Herstellung solcher Formkörper die Vernetzung in wesentlich kürzeren Zeiten durchzuführen, ohne die Alterungseigenschaften des Werkstoffes zu verschlechtern. The invention relates to crosslinking by heat treatment a molded body made of a peroxide-containing, electrically semiconducting polyolefin mixture, how they z. B. by adding carbon black, graphite or metal powder to the polyolefin can be obtained. According to the invention, the shaped body is for this purpose by direct electric resistance heating heated. In this way you can get a quick and achieve uniform heating of the molded body, which is quick and easy to achieve complete conversion of the peroxide in the whole mass of the molding allowed. The invention therefore makes it possible in the production of such shaped bodies to carry out the crosslinking in much shorter times without the aging properties of the material to deteriorate.

Um die Vernetzung in möglichst kurzer Zeit durchzuführen, wird der Formkörper vorteilhaft durch starke, kurzzeitige Widerstandserhitzung stoßartig erhitzt. Noch während oder zum mindesten unmittelbar anschließend an die Wärmebehandlung empfiehlt es sich, den Formkörper zu kalibrieren, um etwa durch die Erwärmung verursachte Formänderungen zu beseitigen. Eine vorteilhaft unmittelbar nach der Vernetzung erfolgende Kühlung des Formkörpers, z. B. mit Wasser, erhöht ebenfalls die Maßhaltigkeit des Erzeugnisses. In order to carry out the networking in the shortest possible time, the Shaped body advantageous jerky due to strong, brief resistance heating heated. During or at least immediately after the heat treatment it is advisable to calibrate the molded body, for example, caused by the heating Eliminate shape changes. One that advantageously takes place immediately after crosslinking Cooling of the shaped body, for. B. with water, also increases the dimensional accuracy of the Product.

Wegen der erreichbaren kurzen Vernetzungszeiten ist das Verfahren nach der Erfindung in besonderem Maße geeignet zur stetigen Vernetzungsbehandlung langgestreckter Formkörper aus den genannten Polyolefinmischungen, wie sie durch Strangpressen oder durch Walzen erzeugt werden. Solche Formkörper sind beispielsweise Fäden, Stäbe, Rohre, Schläuche und insbesondere halbleitende Schichten in elektrischen Kabeln. Für diese Vernetzungsbehandlung kann vorteilhaft eine Kammer verwendet werden, durch die der Formkörper hindurchgeführt wird, und in der für die Stromzufuhr zu dem Formkörper mindestens eine, den hindurchlaufenden Formkörper berührende Elektrode von zweckmäßig ringförmiger Gestalt angeordnet ist. Die Zahl der Elektroden kann beliebig sein. Im allgemeinen sind zwei solcher Elektroden erforderlich. Wenn der zu behandelnde Formkörper über einem metallischen Kern aufgebracht ist, beispielsweise als Korrosionsschutz über dem Metallmantel eines elektrischen Kabels, kann dieser metallische Kern selbst eine der Elektroden darstellen. In diesem Falle empfiehlt es sich, die in der Kammer angeordnete, z. B. ringförmige Gegenelektrode in axialer Richtung so breit zu bemessen, daß die erforderliche Heizleistung im Bereich dieser Gegenelektrode auf den zu behandelnden Formkörper übertragen werden kann. Die Behandlungskammer kann vorteilhaft unmittelbar hinter der Austrittsdüse einer Strangpresse, in der der noch unvernetzte Formkörper gebildet wird, aufgestellt sein. Because of the short cross-linking times that can be achieved, the process is according to the invention particularly suitable for continuous crosslinking treatment elongated Moldings made from the aforementioned polyolefin blends, such as those produced by extrusion or can be generated by rolling. Such molded bodies are, for example, threads, rods, Pipes, hoses and in particular semiconducting layers in electrical cables. A chamber can advantageously be used for this crosslinking treatment which the shaped body is passed through, and in that for the power supply to the shaped body at least one electrode in contact with the shaped body running through is expedient annular shape is arranged. The number of electrodes can be arbitrary. Generally two such electrodes are required. If the to be treated Molded body is applied over a metallic core, for example as corrosion protection over the metal sheath of an electrical cable, this metallic core can itself represent one of the electrodes. In this case it is advisable to use the one in the chamber arranged, e.g. B. to dimension ring-shaped counter-electrode so wide in the axial direction, that the required heating power in the area of this counter electrode on the to be treated Shaped body can be transferred. The treatment chamber can advantageously be immediate behind the outlet nozzle of an extruder, in which the still uncrosslinked molding is formed, be set up.

Die Zeichnung erläutert das Verfahren nach der Erfindung an dem schematisch im Längsschnitt dargestellten Beispiel einer Einrichtung für die Vernetzung einer halbleitenden Schicht eines elektrischen Kabels. The drawing explains the method according to the invention on the schematically Example of a device for networking a device shown in longitudinal section semiconducting layer of an electrical cable.

Das elektrische Kabel 1 tritt mit einer Mantelschicht2, die aus einer peroxydhaltigen, elektrisch halbleitenden Polyolefinmischung besteht, aus der Düse 3 einer Strangpresse aus. Die Kammer, in der die Vernetzung der Schicht 2 durchgeführt wird, ist mit 4 bezeichnet. Sie enthält zwei ringförmige Elektroden 5 und 6, die an eine Stromquelle angeschlossen sind und mit ihrer Innenfläche die zu behandelnde Schicht 2 des Kabels berühren. Der übrige Innenraum der Kammer 4 ist hier zum Kalibrieren der Schicht 2 restlos mit hinreichend festen Isolierkörpern 7 ausgefüllt. Nach seinem Austritt aus der Kammer 4 durchläuft das Kabel noch ein Wasserbad 8. The electrical cable 1 comes with a jacket layer 2, which consists of a peroxide-containing, electrical semiconducting polyolefin mixture, from the nozzle 3 of an extruder. The chamber in which the cross-linking of the layer 2 is carried out is denoted by 4. It contains two ring-shaped electrodes 5 and 6, which are connected to a power source and with their inner surface the touch layer 2 of the cable to be treated. The rest of the interior of the chamber 4 is here for calibrating the layer 2 completely with sufficiently strong insulating bodies 7 completed. After exiting the chamber 4, the cable still runs through Water bath 8.

Die Stromzuführungselektroden können statt ringförmig auch beispielsweise längs Mantellinien auf dem zu behandelnden Formkörper aufliegen. Ringförmige Elektroden können gleichzeitig zum Kalibrieren des Formkörpers dienen. Ferner kann der Heizkammer eine Kalibriervorrichtung etwa in Gestalt eines Ziehringes oder eines Rollenpaares nachgeschaltet sein. Die Kühlvorrichtung ist vorteilhaft durch eine Dichtungsmanschette von der Heizkammer getrennt. The power supply electrodes can also, for example, instead of ring-shaped rest along surface lines on the shaped body to be treated. Annular electrodes can also serve to calibrate the molding. Furthermore, the heating chamber a calibration device in the form of a drawing ring or a pair of rollers be downstream. The cooling device is advantageous through a sealing collar separated from the heating chamber.

Claims (6)

Patentansprüche: 1. Verfahren zum Vernetzen eines Formkörpers aus einer peroxydhaltigen, elektrisch halb- leitenden Polyolefinmischung durch Wärmebehandlung, dadurch gekennzeichnet, daß der Formkörper durch unmittelbare elektrische Widerstandserhitzung geheizt wird. Claims: 1. A method for crosslinking a molded body a peroxide-containing, electrically semi- conductive polyolefin mixture by heat treatment, characterized in that the shaped body is heated by direct electrical resistance is heated. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Formkörper durch starke, kurzzeitige Widerstands erhitzung stoßartig geheizt wird. 2. The method according to claim 1, characterized in that the shaped body is heated abruptly by strong, short-term resistance heating. 3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Formkörper mindestens nach dem Vernetzen kalibriert wird. 3. The method according to any one of claims 1 and 2, characterized in that that the shaped body is calibrated at least after crosslinking. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Formkörper unmittelbar anschließend an die Vernetzung gekühlt wird. 4. The method according to any one of claims 1 to 3, characterized in that that the shaped body is cooled immediately after the crosslinking. 5. Einrichtung zum stetigen Vernetzen eines langgestreckten Formkörgers nach dem Verfahren nach einem der Ansprüche 1 bis 4, gekennzeichnet durch eine Kammer für den Durchlauf des Formkörpers, in der mindestens eine den durchlaufenden Formkörper berührende Elektrode angeordnet ist. 5. Device for the continuous networking of an elongated molded body according to the method according to one of claims 1 to 4, characterized by a chamber for the passage of the shaped body, in which at least one the continuous shaped body contacting electrode is arranged. 6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Elektroden ringförmig sind. 6. Device according to claim 5, characterized in that the electrodes are annular.
DEF41223A 1963-11-08 1963-11-08 Process for crosslinking moldings made from peroxide-containing, electrically semiconducting polyolefin mixtures Pending DE1204385B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005029677A1 (en) * 2005-06-20 2006-12-21 Greiner Extrusionstechnik Gmbh Extrusion plant for thermo-setting plastics includes heating elements insulated from each other and with low friction surfaces placed downstream of extrusion head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005029677A1 (en) * 2005-06-20 2006-12-21 Greiner Extrusionstechnik Gmbh Extrusion plant for thermo-setting plastics includes heating elements insulated from each other and with low friction surfaces placed downstream of extrusion head

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