DE2314713A1 - Annealed copper tube insulated with PVC coating - continuous prodn. through annealing furnace and extruder followed by curing - Google Patents

Annealed copper tube insulated with PVC coating - continuous prodn. through annealing furnace and extruder followed by curing

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Publication number
DE2314713A1
DE2314713A1 DE19732314713 DE2314713A DE2314713A1 DE 2314713 A1 DE2314713 A1 DE 2314713A1 DE 19732314713 DE19732314713 DE 19732314713 DE 2314713 A DE2314713 A DE 2314713A DE 2314713 A1 DE2314713 A1 DE 2314713A1
Authority
DE
Germany
Prior art keywords
heat
tube
pipe
insulating
collar
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.)
Granted
Application number
DE19732314713
Other languages
German (de)
Other versions
DE2314713C2 (en
Inventor
Otto Uhlmann
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.)
KM Kabelmetal AG
Original Assignee
KM Kabelmetal 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 KM Kabelmetal AG filed Critical KM Kabelmetal AG
Priority to DE2314713A priority Critical patent/DE2314713C2/en
Publication of DE2314713A1 publication Critical patent/DE2314713A1/en
Application granted granted Critical
Publication of DE2314713C2 publication Critical patent/DE2314713C2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/154—Making multi-wall tubes
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-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
    • B29C48/15—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
    • B29C48/151—Coating hollow articles
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • 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
    • B29K2705/08—Transition metals
    • B29K2705/10—Copper
    • 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
    • B29L2009/00—Layered products
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Seamless drawn tubing continuously annealed and coated with a thermoplastic material for heat and sound insulation, esp. copper pipe coated with polyvinyl chloride. The advantage is that the tube or conduit can be supplied in coiled lengths of about 25 m which are easily laid and bent. The process starts with coils of drawn copper tube, 200-350 m long which are placed on a coil-holder and (a) pulled through straightening rolls by (b) a drawing device followed by (c) annealing in a tubular furnace in a protective atmos., heat being supplied by resistance-heating through two pairs of conducting rollers, one pair at each end of the insulated furnace, (d) a second set of insulating rolls, (e) an extruder which provides the heat-insulating PVC coating, (f) a cooling channel in which the PVC is cured and (g) a second pulling device. The end of the next coil can be mechanically fixed to the end of the first coil so that the process runs continously. The PVC tube contains internal ribs tapering towards the surface of the copper tube and which are closely packed so that they form arched cavities in the insulation.

Description

Verfahren zum Herstellen von wärme- und schallisolierten Leitungsrohren Die Erfindung betrifft ein Verfahren zum Herstellen von wärme-und schallisolierten Leitungsrohren,bei dem ein Metallrohr von einem Ringbund abgezogen und anschließend mit einer wärmeisolierenden Hülle aus thermoplastischem Kunststoff umgeben wird. Process for the production of heat and sound insulated line pipes The invention relates to a method for producing heat-insulated and sound-insulated Line pipes, in which a metal pipe is pulled from a collar and then is surrounded by a thermally insulating sleeve made of thermoplastic material.

Bei der Herstellung von nahtlosen Kupferrohren geht man beispielsweise so vor, daß man einen Metallbutzen in einer Strangpresse in an sich bekannter Weise zu einem Rohr verpreßt und dieses stränggepreßte Rohr in einem oder mehreren Arbeitsgängen zunächst pilgert und anschließend das gepilgerte Rohr auf den gewünschten Durchmesser herunterzieht. Anschließend werden die Rohre mit einer wärmeisolierenden Hülle aus thermoplastischem Kunststoff umgeben.In the manufacture of seamless copper pipes, for example, one goes in such a way that one slugs a metal slug in an extruder in a manner known per se pressed into a tube and this extruded tube in one or more operations first pilgrimage and then the pilgrim tube to the desired diameter pulls down. Then the pipes are made with a heat-insulating sleeve surrounded by thermoplastic plastic.

Diese Rohre gelangen werksseitig isoliert in Längen zu 5 m an die Montagestelle. Bei der Verlegung in einem rechten Winkel müssen die Rohre wegen ihrer großen Härte über einem sogenannten Rohrkrümmer miteinander verbunden werden.These pipes arrive at the factory insulated in lengths of 5 m Assembly point. When laying at a right angle, the pipes must go their great hardness are connected to one another via a so-called pipe elbow.

Der Erfindung liegt von daher die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem es möglich ist, werksseitig vorisolierte Leitungsrohre herzustellen, die wesentlich leichter verlegt werden können.The invention is therefore based on the object of a method specify with which it is possible to manufacture pre-insulated line pipes at the factory, which can be laid much more easily.

Diese Aufgabe wird bei einem Verfahren der eingangs erwähnten Art dadurch gelöst, daß gemäß der Erfindung das- Metallrohr, nachdem es von dem Vorratsring abgezogen würde, weichgeglüht wird. Duch das Weichglühen werden die durch die Verformungen beim Ziehen- oder Pilgern aufgetretenen Verfestigungen des Metalls wieder rückgängig gemacht und das wärmeisolierte Leitungsrohr kann zu Ringen mit einem Durchmesser von beispielsweise 500 mm aufgewickelt werden; Der Weichglühvorgang wird zweckmäßigerweise unter Schutzgas vorgenommen, um ein Anlaufen der Metalloberfläche zu vermeiden. Als besonders günstig hat es sich erwiesen, das Verfahren bei der Herstellung von wärmeisolierten Leitungsrohren anzuwenden, die aus nahtlos gezogenen Kupferrohren mit einer wärmeisolierenden Hülle aus einem thermoplastischen Kunststoff auf der Basis von Polyvinylchlorid bestehen mit nach innen ragenden Rippen, die ihn gegen die Oberfläche des zu isolierenden Rohres abstützen, wobei die Rippen einen sich vom Schlauch zum Rohr hin verjüngenden Querschnitt haben und so dicht nebeneinander liegen, daß sie mit dem Schlauch gewölbeartige Hohlräume bilden. Diese Rohre weisen hervorragende Schall- und Wärmeisolierungswerte auf und lassen sich aufgrund ihrer guten Biegbarkeit in einfacher Weise verlegen.This task is carried out in a method of the type mentioned at the beginning solved in that according to the invention the metal pipe after it has been removed from the supply ring would be withdrawn, annealed. The soft annealing results in the deformations Solidification of the metal that occurred during pulling or pilgrimage reverses made and the thermally insulated conduit pipe can be made into rings with a diameter of, for example, 500 mm are wound up; The soft annealing process is expedient carried out under protective gas in order to avoid tarnishing of the metal surface. It has proven to be particularly advantageous to use the process in the production of heat-insulated conduit pipes, which are made from seamlessly drawn copper pipes with a thermally insulating cover made of a thermoplastic material on the Polyvinyl chloride base consist with inwardly protruding ribs that oppose it support the surface of the pipe to be insulated, with the ribs forming one from the hose to the pipe tapering cross-section and so close to each other lie that they form vault-like cavities with the hose. These pipes point excellent sound and heat insulation values and, due to their easy to lay with good flexibility.

Die Erfindung betrifft weiterhin eine Anordnung zur Durchführung des Verfahrens bestehend aus einer den Ringbund lagernden Vorrichtung sowie einem die wärmeisolierende Hülle erzeugenden Extruder. Vorteilhafterweise ist hier zwischen der den Ringbund lagernden Vorrichtung und dem Extruder eine elektrische Durch= laufglüheinrichtung vorgesehen, bei der dem zu glühenden Metallrohr der Strom über Rollen zugeführt wird. Als besonders zweckmäßig hat es sich erwiesen, wenn man koaxial zu dem durchlaufenden Metallrohr ein wärmedämmendes Rohr größeren Durchmessers als das Metallrohr anordnet und dieses mit Schutzgas füllt.The invention also relates to an arrangement for performing the Method consisting of a device supporting the annular collar and a die heat-insulating sheath-producing extruder. It is advantageous here between the device supporting the collar and the extruder have an electrical through = Running glow device is provided, in which the current to the metal pipe to be glowed is passed over Rolls is fed. It has proven to be particularly useful if one is coaxial to the continuous metal pipe a heat-insulating pipe of larger diameter than arranges the metal tube and fills it with protective gas.

Dadurch werden die Wärmeverluste auf ein Minimum gehalten und die Schutzgasatmosphäre in einfacher Weise erzeugt.This keeps the heat losses to a minimum and the Protective gas atmosphere generated in a simple manner.

Die Erfindung ist anhand des in der Figur schematisch dargestellten Ausführungsbeispiels näher erläutert.The invention is shown schematically on the basis of the figure Embodiment explained in more detail.

Das zu Ringbunden gewickelte nahtlos gezogene und auf Dichtigkeit geprüfte Kupferrohr i wird auf eine kegel stumpfförmige Haltevorrichtung 2 aufgelegt und von dort kontinuierlich abgezogen. Die Länge der Ringbunde ist abhängig von dem Gewicht des in dem Rezipienten der Strangpresse eingebrachten Butzens sowie der Abmessungen des gezogenen Rohres und beträgt zwischen 200 und 350 m. Kurz bevor die gesamte Länge eines Ringbundes abgezogen ist, wird das Ende dieses Bundes mit dem Anfang eines nächsten Ringbundes mechanisch fest verbunden, so daß eine nahezu unendliche Länge durch die Anlage hindurchgezogen wird.The seamlessly drawn and tightly wrapped into coils The tested copper pipe i is placed on a frustoconical holding device 2 and continuously withdrawn from there. The length of the coils depends on the weight of the slug introduced into the recipient of the extruder and the dimensions of the drawn pipe and is between 200 and 350 m the entire length of a coil is deducted, the end of this covenant will be with mechanically firmly connected to the beginning of the next coil, so that one almost infinite length is pulled through the system.

Die erste Stufe der Fertigungsanlage ist ein sogenannter Richtrollensatz 3, der aus mehreren profilierten Rollen besteht, mittels derer das Rohr geradegerichtet wird. Die hierzu notwendigen Zugkräfte werden durch einen hinter dem Richtrollensatz 3 angeordneten Raupenabzug 4 aufgebracht.The first stage of the production system is a so-called straightening roller set 3, which consists of several profiled rollers, by means of which the pipe is straightened will. The tensile forces required for this are generated by a set behind the straightening roller set 3 arranged caterpillar take-off 4 applied.

Hinter dem Raupenabzug 4 ist eine sogenannte Durchlaufglüheinrichtung 5 vorgesehen, in der das Kupferrohr kontinuierlich geglüht wird. Die Durchlaufglüheinrichtung 5 arbeitet nach dem Prinzip des Widerstandsglühens. Der hierzu notwendige Strom wird dem Kupferrohr 1 über die Rollenpaare 6 und 7 zugeführt. Um zu verhindern, daß das Kupferrohr i während des Glühvorganges anläuft, und um einen zu gDoßen Wärmeverlust zu vermeiden, ist koaxial zu dem Kupferrohr 1 ein Asbestrohr 8 angeordnet, das von Schutzgas durchströmt ist. Unmittelbar hinter der Glüheinrichtung ist ein weiterer Richtrollensatz 9 angeordnet, der das Kupferrohr ausrichtet.Behind the caterpillar haul-off 4 is a so-called continuous annealing device 5 provided, in which the copper tube is continuously annealed. The continuous annealing device 5 works on the principle of resistance annealing. The electricity required for this is fed to the copper pipe 1 via the roller pairs 6 and 7. To prevent, that the copper tube i starts up during the annealing process, and to avoid too much heat loss to avoid, an asbestos pipe 8 is arranged coaxially to the copper pipe 1, which of Protective gas is flowing through. Immediately behind the glow device is another one Arranged straightening roller set 9, which aligns the copper pipe.

Zum Aufbringen der wärmeisolierenden Hülle dient der Extruder 10. Anschließend gelangt das auf diese Weise wärmeisolierte Kupferrohr in eine nicht mehr dargestellb Kühlrinne, in der der thermoplastische Kunststoff aushärtet.The extruder 10 is used to apply the heat-insulating sheath. The copper pipe, which is thermally insulated in this way, then passes into a non- more shown cooling trough in which the thermoplastic material hardens.

Eine weitere nicht mehr dargestellte Zugraupe bringt die notwendigen Zugkräfte auf. Anschließend kann das wärmeisolierte Kupferrohr in an sich bekannter Weise mit Markierungen versehen werden und wird abschließend in Längen zu 25 m abgetrennt und zu sogenannten ttCoils" aufgewickelt und verpackt.Another pulling caterpillar, not shown, brings the necessary Tensile forces on. The thermally insulated copper pipe can then be used in a known manner Way to be provided with markings and is then cut into lengths of 25 m and wound up and packed into so-called ttCoils.

Der wesentliche Vorteil des erfindungsgemäßen Verfahren ist, daß es nunmehr gelungen ist, in wirtschaftlicher Weise ein fabrikseitig wärmeisoliertes Leitungsrohr zu schaffen, das aufgrund seiner guten Biegbarkeit sehr leicht verlegbar ist.The main advantage of the method according to the invention is that it has now succeeded in an economical way, a factory-side thermally insulated To create conduit that is very easy to lay due to its good bendability is.

Claims (5)

PatentansprücheClaims 1. Verfahren zum Herstellen von wärme- und schallisolierten Leitungsrohren, bei dem ein Metallrohr von einem Ringbund abgezogen und anschließend mit einer wärmeisolierenden Hülle aus thermoplastischem Kunststoff umgeben wird, dadurch gekennzeichnet, daß das Metallrohr, nachdem es von dem Ringbund abgezogen wurde, weichgeglüht wird.1. Process for the production of heat and sound-insulated line pipes, in which a metal tube is pulled from a collar and then with a heat insulating Sheath made of thermoplastic material is surrounded, characterized in that the metal tube, after it has been pulled off the collar, is annealed. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß das Metallrohr unter Schutzgas geglüht wird.2. The method according to claim i, characterized in that the metal pipe is annealed under protective gas. 3. Anwendung des Verfahrens nach Anspruch 1 oder 2 zur Herstellung von wärmeisolierten Leitungsrohren, bestehend aus nahtlos gezogenen Kupferrohren mit einer wärmeisolierenden Hülle aus einem thermoplastischen Kunststoff auf der Basis von Polyvinylchlorid mit nach innen ragenden Rippen, die ihn gegen die Oberfläche des zu isolierenden Rohres abstützen, wobei die Rippen einen sich vom Schlauch zum Rohr hin verjüngenden Querschnitt haben und so dicht nebeneinander liegen, daß sie mit dem Schlauch gewölbeartige Hohlräume bilden.3. Application of the method according to claim 1 or 2 for production of heat-insulated line pipes, consisting of seamlessly drawn copper pipes with a thermally insulating cover made of a thermoplastic material on the Base of polyvinyl chloride with inwardly protruding ribs that hold it against the surface of the pipe to be insulated, with the ribs extending from the hose to the Tube have a tapering cross-section and are so close together that they form vault-like cavities with the hose. 4. Anordnung zur Durchführung des Verfahrens nach Anspruch 1 oder einem der folgenden, bestehend aus einer den Ringbund lagernden Vorrichtung, sowie einem die wärmsisolierende Hülle erzeugenden Extruder, dadurch gekennzeichnet, daß zwischen der den Ringbund lagernden Vorrichtung (2) und dem Extruder (10) eine elektrische Durchlaufglüheinrichtung (5) vorgesehen ist, bei der dem zu glühenden Metallrohr (i) der Strom über Rollen (6,7) zugeführt wird.4. Arrangement for performing the method according to claim 1 or one of the following, consisting of a device supporting the collar, as well as an extruder producing the heat-insulating casing, characterized in that between the device (2) supporting the collar and the extruder (10) an electrical Continuous annealing device (5) is provided in which the metal pipe to be annealed (i) the current is fed in via rollers (6,7). 5. Anordnung nach Anspruch 4, dadurch gekennzeichnet, daß koaxial zu dem durchlaufenden Metallrohr (1) ein wärmedämmendes Rohr (8) größeren Durchmessers als das Metallrohr (i) vorgesehen und mit Schutzgas gefüllt ist.5. Arrangement according to claim 4, characterized in that coaxial to the continuous metal pipe (1) a heat-insulating pipe (8) of larger diameter is provided as the metal pipe (i) and is filled with protective gas.
DE2314713A 1973-03-24 1973-03-24 Process for the production of heat and sound insulated line pipes Expired DE2314713C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2314713A DE2314713C2 (en) 1973-03-24 1973-03-24 Process for the production of heat and sound insulated line pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2314713A DE2314713C2 (en) 1973-03-24 1973-03-24 Process for the production of heat and sound insulated line pipes

Publications (2)

Publication Number Publication Date
DE2314713A1 true DE2314713A1 (en) 1974-09-26
DE2314713C2 DE2314713C2 (en) 1984-06-20

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DE2314713A Expired DE2314713C2 (en) 1973-03-24 1973-03-24 Process for the production of heat and sound insulated line pipes

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548588A1 (en) * 1983-07-09 1985-01-11 Kabel Metallwerke Ghh PROCESS FOR REALIZING A RIGID TUBE SYSTEM CONSISTING OF AT LEAST TWO CONCENTRIC METAL TUBES
EP0310190A1 (en) * 1987-09-28 1989-04-05 i.c. Möller a/s A heat insulated pipe element, a pipeline of such elements, and a method of laying such a pipeline

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974783C (en) * 1953-07-22 1961-04-27 Dynamit Nobel Ag With an elastic plastic tube covered pipe made of metal or the like.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974783C (en) * 1953-07-22 1961-04-27 Dynamit Nobel Ag With an elastic plastic tube covered pipe made of metal or the like.

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
Deutsches Kupfer-Institut e.V., Kupferrohr- installation, 1959, S. 8,9,11,18 *
DE-Z: Draht, 22, 1971, 4, S. 224 *
GROTHE, H.: Kabeltag über Kabelmaschinen und Fertigungsfragen, Deutsche Industriemesse Hannover 1962, Lexikon der Hüttentechnik, Bd. 5, 1963, S. 245 *
LANDICHOW, A.O.: Herstellung von Rohren, Stangen und Profilen aus NE-Metallen, 1955, S. 234 *
MILLER, R. v.: Lexikon der Energietechnik und Kraftmaschinen, Bd. 6, 1965, S. 582 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548588A1 (en) * 1983-07-09 1985-01-11 Kabel Metallwerke Ghh PROCESS FOR REALIZING A RIGID TUBE SYSTEM CONSISTING OF AT LEAST TWO CONCENTRIC METAL TUBES
EP0310190A1 (en) * 1987-09-28 1989-04-05 i.c. Möller a/s A heat insulated pipe element, a pipeline of such elements, and a method of laying such a pipeline

Also Published As

Publication number Publication date
DE2314713C2 (en) 1984-06-20

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