DE10347641A1 - Extruding polytetrafluoroethylene around an elongated carrier, e.g. wire, comprises continuous extrusion through an annular gap and deposition under pressure onto the carrier - Google Patents
Extruding polytetrafluoroethylene around an elongated carrier, e.g. wire, comprises continuous extrusion through an annular gap and deposition under pressure onto the carrier Download PDFInfo
- Publication number
- DE10347641A1 DE10347641A1 DE10347641A DE10347641A DE10347641A1 DE 10347641 A1 DE10347641 A1 DE 10347641A1 DE 10347641 A DE10347641 A DE 10347641A DE 10347641 A DE10347641 A DE 10347641A DE 10347641 A1 DE10347641 A1 DE 10347641A1
- Authority
- DE
- Germany
- Prior art keywords
- carrier
- extruder
- polytetrafluoroethylene
- ptfe
- air gap
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by 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
- B29C48/022—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
- B29C48/06—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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/832—Heating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
- H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
-
- 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
-
- 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
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
-
- 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
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
-
- 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
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Extrudieren von Polytetrafluorethylen, mit welchem mindestens eine Schicht dieses Materials rundum auf einen langgestreckten Träger aufgebracht wird (DE-AS 17 29 183).The This invention relates to a process for extruding polytetrafluoroethylene, with which at least one layer of this material around an elongated carrier is applied (DE-AS 17 29 183).
Polytetrafluorethylen – im folgenden kurz mit „PTFE" bezeichnet – ist ein relativ preiswertes und sowohl in elektrischer als auch in mechanischer Hinsicht hochwertiges Material. Es ist temperaturbeständig bis zu Temperaturen von etwa 260 °C. PTFE ist außerdem gegen aggressive Medien, wie Öl und Chemikalien, beständig. Probleme treten aber bei seiner Verarbeitung auf, insbesondere beim Beschichten von langgestreckten Trägern, wie beispielsweise Drähten, Kabeln und Leitungen. Insbesondere auf diese Anwendungen bezieht sich das Verfahren nach der Erfindung.Polytetrafluoroethylene - in the following short with "PTFE" - is a relatively inexpensive and both electrical and mechanical Respect high quality material. It is temperature resistant up to temperatures of about 260 ° C. PTFE is as well against aggressive media, such as oil and chemicals, resistant. But problems occur in its processing, especially in the Coating of elongate carriers, such as wires, cables and wires. In particular, to these applications, the method relates according to the invention.
Bei dem Verfahren nach der eingangs erwähnten DE-AS 17 29 183 wird zum Isolieren eines elektrischen Leiters ein denselben umgebender Preßraum verwendet, der durch Zwischenwände in mindestens zwei längs verlaufende, koaxiale Teilräume aufgeteilt ist. In die Teilräume wird PTFE-Pulver eingefüllt und zu einem den Leiter zylindrisch umgebenden Formkörper ausgepreßt, nachdem die Zwischenwände zwischen den Teilräumen entfernt worden sind. Dieses als „Ramextrusion" bezeichnete Verfahren ist aufwendig. Es gestattet außerdem keine kontinuierliche Arbeitsweise und ist daher nur für das Isolieren kurzer Längen geeignet.at the method of the aforementioned DE-AS 17 29 183 is used to insulate an electrical conductor a surrounding pressing chamber, the through partitions in at least two longitudinally running, coaxial subspaces is divided. In the subspaces PTFE powder is filled and squeezed out to a cylindrical body surrounding the conductor, after the partitions between the subspaces have been removed. This process called "ramextrusion" is expensive. It also allows no continuous operation and is therefore only for isolating short lengths suitable.
Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschriebene Verfahren so zu gestalten, daß eine kontinuierliche Arbeitsweise möglich ist.Of the Invention is based on the object described above To arrange a procedure so that a continuous operation is possible.
Diese Aufgabe wird gemäß der Erfindung durch die Verwendung eines mit einer in einer Förderrichtung des PTFEs verlaufenden Durchgangsbohrung versehenen Extruders gelöst, durch welche der Träger in Förderrichtung hindurchgezogen wird, welcher einen sich in Förderrichtung konisch verengenden, die Durchgangsbohrung umschließenden Dorn, dessen äußere, konische verlaufende Oberfläche profiliert ist, sowie eine den Dorn unter Einschluß eines umlaufenden Luftspalts umgebende Abdeckung mit konischem Hohlraum hat, mit welchem das PTFE durch den umlaufenden Luftspalt kontinuierlich gefördert und unter Druck zur Anlage am Träger gebracht wird.These Task is carried out according to the invention the use of one with a running in a conveying direction of the PTFE Through hole provided extruder, through which the carrier in the conveying direction is pulled through, which has a conically narrowing in the conveying direction, the thru-hole surrounding the through-hole, its outer, conical running surface is profiled, as well as a thorn including one surrounding air gap surrounding conical cavity cover has, with which the PTFE continuously promoted by the circulating air gap and under pressure to the plant on the carrier is brought.
Bei
Verwendung des speziellen, beispielsweise in der
Zur weiteren Herabsetzung von eventuell doch vorhandenen, niedrigen Scherkräften können dem PTFE vor dem Einfüllen in den Extruder Gleitmittel beigemengt werden, wie beispielsweise Polyvinylidenfluorid oder Benzin.to further reduction of possibly existing, low shear can that PTFE before filling be added to the extruder lubricant, such as Polyvinylidene fluoride or gasoline.
Das Verfahren nach der Erfindung wird anhand der Zeichnungen als Ausführungsbeispiel erläutert.The Method according to the invention will be described with reference to the drawings as an embodiment explained.
Es zeigen:It demonstrate:
In
Entsprechend
Das
um den Draht
Durch
die sich konisch verjüngende
Form und die profilierten Oberflächen
von Dorn
Zur
Verbesserung der Gleiteigenschaften des PTFEs im Extruder
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10347641A DE10347641A1 (en) | 2003-10-14 | 2003-10-14 | Extruding polytetrafluoroethylene around an elongated carrier, e.g. wire, comprises continuous extrusion through an annular gap and deposition under pressure onto the carrier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10347641A DE10347641A1 (en) | 2003-10-14 | 2003-10-14 | Extruding polytetrafluoroethylene around an elongated carrier, e.g. wire, comprises continuous extrusion through an annular gap and deposition under pressure onto the carrier |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10347641A1 true DE10347641A1 (en) | 2005-05-19 |
Family
ID=34441928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10347641A Ceased DE10347641A1 (en) | 2003-10-14 | 2003-10-14 | Extruding polytetrafluoroethylene around an elongated carrier, e.g. wire, comprises continuous extrusion through an annular gap and deposition under pressure onto the carrier |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10347641A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260763B (en) * | 1961-10-13 | 1968-02-08 | Raybestos Manhattan Inc | Method and device for producing hoses from tetrafluoroethylene |
WO1984000717A1 (en) * | 1982-08-23 | 1984-03-01 | Carlisle Corp | Manufacture of low density sintered polytetrafluoroethylene insulated cable |
DE4040882A1 (en) * | 1990-12-20 | 1992-07-02 | Troester Maschf Paul | SPRAY HEAD FOR SHEATHING LONG STRETCHED ITEMS |
EP0422042B1 (en) * | 1988-06-06 | 1995-01-18 | KIRJAVAINEN, Kari | Extrusion method, apparatus and product |
-
2003
- 2003-10-14 DE DE10347641A patent/DE10347641A1/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260763B (en) * | 1961-10-13 | 1968-02-08 | Raybestos Manhattan Inc | Method and device for producing hoses from tetrafluoroethylene |
WO1984000717A1 (en) * | 1982-08-23 | 1984-03-01 | Carlisle Corp | Manufacture of low density sintered polytetrafluoroethylene insulated cable |
EP0422042B1 (en) * | 1988-06-06 | 1995-01-18 | KIRJAVAINEN, Kari | Extrusion method, apparatus and product |
DE4040882A1 (en) * | 1990-12-20 | 1992-07-02 | Troester Maschf Paul | SPRAY HEAD FOR SHEATHING LONG STRETCHED ITEMS |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
OP8 | Request for examination as to paragraph 44 patent law | ||
8131 | Rejection |