DE1196852B - Device for the production of foam insulation for electrical conductors using the extrusion process - Google Patents
Device for the production of foam insulation for electrical conductors using the extrusion processInfo
- Publication number
- DE1196852B DE1196852B DES63028A DES0063028A DE1196852B DE 1196852 B DE1196852 B DE 1196852B DE S63028 A DES63028 A DE S63028A DE S0063028 A DES0063028 A DE S0063028A DE 1196852 B DE1196852 B DE 1196852B
- Authority
- DE
- Germany
- Prior art keywords
- foam insulation
- foaming
- extrusion process
- electrical conductors
- negative pressure
- 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
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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
- B29C44/322—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being elongated inserts, e.g. cables
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
Vorrichtung zur Herstellung einer Schaumstoffisolierung von elektrischen Leitern im Strangpreßverfahren Es ist bekannt, eine Schaumstoffisolierung auf elektrischen Leitern durch Aufspritzen eines mit einem Verschäumungsmittel versehenen Kunststoffes im Strangpreßverfahren herzustellen. In jüngster Zeit wurde verschäumtes Polyäthylen mit einem maximalen Verschäumungsgrad von 50°/o als Isolierung bei Fernsprechkabeln eingesetzt. Es ist aber bisher nicht gelungen, einen möglichst hohen Verschäumungsgrad von etwa 70 /o zu erreichen, wie er aus technischen und wirtschaftlichen Gründen erwünscht wäre. Bei Versuchen, einen erhöhten Verschäumungsgrad zu erreichen, hat sich bisher eine unregelmäßig verschäumte und abgeflachte Isolierung der Leitung ergeben.Device for the production of a foam insulation of electrical Ladders in the extrusion process It is known, a foam insulation on electrical Ladders by spraying on a plastic provided with a foaming agent to be produced by extrusion. More recently, foamed polyethylene has become with a maximum degree of expansion of 50% as insulation for telephone cables used. So far, however, it has not been possible to achieve the highest possible degree of foaming of about 70 / o, as it is for technical and economic reasons would be desirable. When trying to achieve an increased degree of foaming, has So far there has been an irregularly foamed and flattened insulation of the line result.
Der Erfindung liegt die Erkenntnis zugrunde, daß die Schäumkraft nicht allein von der Menge der durch die Verschäumungsmittel entwickelten Gase abhängig ist, sondern, daß der Schäumkraft der äußere Luftdruck, die Abkühlung und die damit verbundene Verfestigung des Materials entgegenwirken. The invention is based on the knowledge that the foaming power does not depend solely on the amount of gases evolved by the foaming agents is, but that the foaming force is the external air pressure, the cooling and the associated counteract associated solidification of the material.
Dies ist besonders bei Polyäthylen der Fall, das als verschäumbare Schmelze aus dem Mundstück der Strangpresse austritt.This is particularly the case with polyethylene, which is considered foamable Melt emerges from the die of the extruder.
Die genannten Nachteile sollen gemäß der Erfindung in einfachster Weise dadurch vermieden werden, daß bei einer Vorrichtung zur Herstellung einer Schaumstoffisolierung von elektrischen Leitern aus mit einem Verschäumungsmittel versehenen Kunststoff im Strangpreßverfahren und Verschäumung in einem Arbeitsgang, wobei die Aufschäumung des Kunststoffes mindestens teilweise in einem an das Mundstück der Presse dicht anschließenden Raum, der unter Unterdruck steht, erfolgt. Zweckmäßigerweise wird an das Mundstück der Strangpresse ein Rohr angeschlossen, das mit einem Vakuumanschluß versehen ist, um einen Unterdruck aufrechtzuerhalten, der in Richtung nach der Öffnung des Rohres abnimmt. Die Länge des Rohres muß entsprechend der Stärke der herzustellenden Schaumstoffisolierung oder Schaumstoffteile und der Fahrgeschwindigkeit bemessen werden. Vorteilhafterweise kann man das Rohr durch Ringblenden, insbesondere Irisblenden, die den herzustellenden Schaumstoffkörper nahezu umschließen, unterteilen. According to the invention, the disadvantages mentioned are intended to be as simple as possible Way to be avoided that in a device for producing a Foam insulation of electrical conductors with a foaming agent provided plastic in the extrusion process and foaming in one operation, wherein the foaming of the plastic at least partially in one of the mouthpiece the press tightly adjoining space, which is under negative pressure, takes place. Appropriately a pipe is connected to the mouthpiece of the extruder, which is equipped with a vacuum connection is provided to maintain a negative pressure towards the opening of the pipe decreases. The length of the pipe must correspond to the strength of the one to be produced Foam insulation or foam parts and the driving speed will. Advantageously, the tube can be closed by ring diaphragms, in particular iris diaphragms, which almost enclose the foam body to be produced, subdivide.
In der Figur ist schematisch eine erfindungsgemäß ausgebildete Vorrichtung dargestellt. Der zu isolierende Draht 1 läuft in den Spritzkopf 2 einer nicht dargestellten Strangpresse ein und tritt mit dem Schaumstoff 3 versehen am Mundstück 4 des Spritz- kopfes aus. An das Mundstück 4 ist ein Rohr 5 angeschlossen, welches einen Vakuumanschluß 6 aufweist und dadurch unter Unterdruck gehalten wird. In the figure, a device designed according to the invention is schematically shown shown. The wire 1 to be insulated runs into the extrusion head 2 of a not shown Extruder and occurs with the foam 3 provided on the mouthpiece 4 of the injection head the end. A tube 5 is connected to the mouthpiece 4 and has a vacuum connection 6 and is thereby kept under negative pressure.
Das Rohrstück 5 ist durch Irisblenden 7, die bis nahe an die Schaumstoffisolierung 3 herantreten, unterteilt, so daß der Unterdruck nach der Öffnung 8 des Rohres 5 zu allmählich abnimmt. Hierdurch wird es möglich, eine gleichmäßige Schaumstoffisolierung 3 mit erhöhtem Verschäumungsgrad herzustellen.The pipe section 5 is through iris diaphragms 7, which close to the foam insulation 3 approach, divided so that the negative pressure after the opening 8 of the pipe 5 too gradually decreases. This makes it possible to have a uniform foam insulation 3 to produce with an increased degree of foaming.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES63028A DE1196852B (en) | 1959-05-16 | 1959-05-16 | Device for the production of foam insulation for electrical conductors using the extrusion process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES63028A DE1196852B (en) | 1959-05-16 | 1959-05-16 | Device for the production of foam insulation for electrical conductors using the extrusion process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1196852B true DE1196852B (en) | 1965-07-15 |
Family
ID=7496063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES63028A Pending DE1196852B (en) | 1959-05-16 | 1959-05-16 | Device for the production of foam insulation for electrical conductors using the extrusion process |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1196852B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2545931A1 (en) * | 1975-10-14 | 1977-04-21 | Felten & Guilleaume Carlswerk | Injecting foamed plastic insulation into coaxial cables - to obtain controlled expansion and form uniform cell structure, aided by lubricant addition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR957687A (en) * | 1946-12-02 | 1950-02-23 | ||
| DE910223C (en) * | 1938-05-13 | 1954-04-29 | Basf Ag | Process for the production of porous moldings |
-
1959
- 1959-05-16 DE DES63028A patent/DE1196852B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE910223C (en) * | 1938-05-13 | 1954-04-29 | Basf Ag | Process for the production of porous moldings |
| FR957687A (en) * | 1946-12-02 | 1950-02-23 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2545931A1 (en) * | 1975-10-14 | 1977-04-21 | Felten & Guilleaume Carlswerk | Injecting foamed plastic insulation into coaxial cables - to obtain controlled expansion and form uniform cell structure, aided by lubricant addition |
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