DE2109497A1 - Pipe sleeving extrusion - produces internal ribs in insulating sleeve with intermittent barriers joining ribs - Google Patents

Pipe sleeving extrusion - produces internal ribs in insulating sleeve with intermittent barriers joining ribs

Info

Publication number
DE2109497A1
DE2109497A1 DE19712109497 DE2109497A DE2109497A1 DE 2109497 A1 DE2109497 A1 DE 2109497A1 DE 19712109497 DE19712109497 DE 19712109497 DE 2109497 A DE2109497 A DE 2109497A DE 2109497 A1 DE2109497 A1 DE 2109497A1
Authority
DE
Germany
Prior art keywords
ribs
mandrel
die
pipe
axially
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
DE19712109497
Other languages
German (de)
Inventor
Arnold 3012 Langenhagen Vogts
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 DE19712109497 priority Critical patent/DE2109497A1/en
Priority to AR237295A priority patent/AR193617A1/en
Publication of DE2109497A1 publication Critical patent/DE2109497A1/en
Pending 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
    • 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
    • B29C48/03—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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/15—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
    • B29C48/25—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
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B29C48/327—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections with centering means

Abstract

An injection appts. for forming a thermally insulating sleeve around a pipe with longitudinal ribs on the internal face of the sleeve, comprises an annular die and a coaxial mandrel with external ribs to shape the internal ribs of the sleeve. During the extrusion operation, the die and mandrel can be moved relatively, axially and/or rotationally, thus causing the extruded ribs inside the sleeve to weld together locally at intervals into a solid ring, which blocks the migration of leaks etc., along the insulation.

Description

Spritzwerkzeug zur Herstellung eines Isoliermantels für wärmeisolierte Leitungsrohre Die Erfindung betrifft ein Spritzwerkzeug zur Herstellung eines Isoliermantels für wärmeisolierte Leitungsrohre, der auf der dem Rohr zugekehrten Innenfläche angebrachte Vorsprünge in Form von in axialer Richtung verlaufender Rippen aufweist, bestehend aus einer Matrize und einem in die Bohrung der Matrize hineinragenden Dorn, der zumindest in dem in die Matrizenbohrung hineinragenden Bereich mit die Form und Anzahl der Rippen im Negativ aufweisenden Zacken versehen ist. Injection mold for the production of an insulating jacket for heat-insulated Line pipes The invention relates to an injection molding tool for producing an insulating jacket for heat-insulated conduit pipes, the one attached to the inner surface facing the pipe Has projections in the form of ribs running in the axial direction, consisting from a die and a mandrel protruding into the bore of the die, the at least in the area protruding into the die bore with the shape and Number of ribs in the negative is provided with serrations.

Es sind wärmeisolierte Rohre bekannt, die aus einem metallischen Rohr und einer auf das Rohr aufgebrachten Isolierhülle aus thermoplastischem Kunststoff bestehen. Zur Verbesserung der Isolationswerte weist die Isolierhülle an ihrer dem Metallrohr zugekehrten Seite längsverlaufende Rippen auf, die im Querschnitt dreieckförmig waren und sich mit ihrer Spitze auf dem Metallrohr abstützen. Der Isolationswert solcher Umhüllung ist sehr gut, jedoch weisen die Leitungsrohre den Nachteil auf, daß die Hohlräume zwischen den Rippen bei einer Beschädigung des Metallrohres beispielsweise das austretende Wasser weiterleiten, so daß die Schadensstelle erst nach Entfernung der Isolierhülle in dem Bereich zwischen Schadenstelle und Austrittsstelle des Wassers festgestellt werden kann, d. h., dort, wo die Isolierhülle unterbrochen ist, beispielsweise an einer Nahtstelle. Ein weiterer Nachteil ist, daß dort, wo die Isolierhülle unterbrochen ist, Luftf#htigkeit eindringen kann, die den Isolationswert erheblich senken kann (britisches Patent 830 708).There are thermally insulated pipes known, which consist of a metallic pipe and an insulating sleeve made of thermoplastic material and applied to the pipe exist. In order to improve the insulation values, the insulation cover has on its dem Metal tube facing side on longitudinal ribs, which are triangular in cross section and support themselves with their tip on the metal tube. The insulation value such a covering is very good, but the line pipes have the disadvantage, that the cavities between the ribs in the event of damage to the metal pipe, for example forward the escaping water, so that the damaged area only after removal the insulating cover in the area between the damaged area and the water outlet to be established can, d. i.e., where the insulating sleeve is interrupted is, for example at a seam. Another disadvantage is that there where If the insulation is broken, air can penetrate, which affects the insulation value can reduce significantly (British patent 830 708).

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu finden, mit der es möglich ist, wärmeisolierte Rohre der eingangs erwähnten Art zwischen Isolierhülle und Leitungsrohr längswasserdicht auszubilden. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß bei einer Vorrichtung eingangs erwähnter Art der Dorn und die Matrize während des Spritzvorganges relatiy zueinander axial und/oder in Umfangsrichtung bewegbar sind. Durch die Relativbewegung von Dorn und Matrize ist es möglich, in Abständen einen massiven Ring auf das Metallrohr aufzubringen, der eine Längswasserwanderung verhindert, auch ist es möglich, durch schnelle Drehung des Dornes die Rippen in Umfangsrichtung umzulenken, so daß die Rippen im Bereich der Umlenkung an ihren Flanken miteinander verschweißen.The invention is based on the object of finding a device with which it is possible to heat-insulated pipes of the type mentioned between Train the insulating sleeve and conduit pipe to be longitudinally watertight. This object is achieved according to the invention solved in that in a device of the type mentioned above, the mandrel and the Die during the injection process relatiy to one another axially and / or in the circumferential direction are movable. Due to the relative movement of the mandrel and die, it is possible to move in To apply a massive ring to the metal pipe at intervals, which causes a longitudinal migration of water prevents, also, it is possible to turn the ribs in by rapid rotation of the mandrel To deflect the circumferential direction, so that the ribs in the area of the deflection at their Weld the flanks together.

Neben der Längswasserdichtigkeit wird durch diese Maßnahme auch eine erheblich bessere Schallisolierung erzielt.In addition to longitudinal watertightness, this measure also provides a Significantly better sound insulation achieved.

Wenn der Dorn und/oder die Matrize axial bewegbar sind, ist es von Vorteil, koaxial zum Dorn eine axial bewegliche, vorzugsweise federnd gelagerte einen Druckausgleich im Innern des Spritzkopfes bewirkende Buchse anzuordnen.If the mandrel and / or the die are axially movable, it is from Advantage, coaxially to the mandrel an axially movable, preferably resiliently mounted to arrange a pressure equalization inside the spray head causing socket.

Der Druck würde nämlich ohne diese Maßnahme in einer Weise, die den verfahrenstechnischen Forderungen widerspricht, mit der Dornbewegung schwingen. Er würde gerade dann ansteigen, wenn der Austrittsquerschnitt sich bei vorlaufendem Dorn verengt und weniger Masse austreten soll. Ebenso steht der Druckabfall beim Dornrücklauf der Forderung entgegen, daß bei Vergrößerung des Düsenquerschnitts mehr Masse ausgepreßt werden muß. Buchse und Dorn arbeiten somit im Gegentakt, wodurch die Maßhaltigkeit und Oberflächenglätte der Isolierhülle weiter verbessert wird. Wenn der Dorn axial bewegt werden soll, geschieht das zweckmäßigerweise durch einen Exzenterantrieb. Bei Drehung des Dornes im Umfangsrichtung ist es vorteilhaft, daß der Dorn in wechselnder Folge drehantreibbar ist, wobei die Austrittsgeschwindigkeit des thermoplastischen Kunststoffes die Anzahl der Breite der Rippen sowie die Winkelgeschwindigkeit des Dornes so aufeinander abgestimmt sind, daß die Rippen an ihren Flanken miteinander verschweißen. Durch diese Maßnahme entstehen zwischen den Wendepunkten in sich geschlossene Kammern, in die keine Feuchtigkeit eindringen kann.Without this measure, the pressure would be in a way that would procedural requirements contradicts, swing with the mandrel movement. It would increase precisely when the exit cross-section was advancing The mandrel is narrowed and less mass should emerge. Likewise, there is the pressure drop at Mandrel return contrary to the requirement that when the nozzle cross-section is enlarged more mass has to be squeezed out. Bushing and mandrel thus work in push-pull, which means the dimensional accuracy and surface smoothness of the insulating sleeve is further improved. If the mandrel is to be moved axially, this is expediently done by a Eccentric drive. When rotating the mandrel in the circumferential direction, it is advantageous that the mandrel can be driven in rotation in alternating sequence, with the exit speed of the thermoplastic material, the number of the width of the ribs and the angular velocity of the mandrel are coordinated so that the ribs on their flanks with one another weld. This measure creates self-contained areas between the turning points Chambers into which no moisture can penetrate.

Als besonders vorteilhaft hat es sich erwiesen, wenn die axiale und die in Umfangsrichtung gerichtete Relativbewegung zwischen Dorn und Matrize einander überlagert werden. Der Zufluß des thermoplastischen Kunststoffes kann dann optimal gesteuert werden.It has proven to be particularly advantageous if the axial and the relative movement between the mandrel and the die in the circumferential direction are superimposed. The inflow of the thermoplastic plastic can then be optimal being controlled.

Die Erfindung ist an Hand der in den Figuren 1 bis 5 dargestellten Ausführungsbeispiele näher erläutert.The invention is based on that shown in FIGS Embodiments explained in more detail.

In der Figur i ist ein Spritzkopf dargestellt, der aus einer Matrize 1 und einem Dorn 2 besteht, der zumindest im Bereich des Matrizenausganges mit längsverlaufenden Zacken 3 versehen ist, die auf der Innenseite des extrudierten Kunststoffschlauches 4 längsverlaufende Rippen 5 erzeugen Der Dorn 2 ist als Hohldorn ausgebildet, so daß ein zu ummantelndes Metallrohr 6 durch den Hohlraum hindurchgeführt werden kann. Der extrudierte Kunststoffschlauch 4 legt sich nach dem Verlassen des Spritzkopfes auf Grund seiner Schrumpfung fest auf das Metallrohr 6 auf. Die durch die Zacken 3 am Dorn 2 gebildeten Hohlräume geben dem Metallrohr gute thermische und akkustische Isoliereigenschaften, die aber bei Zutritt von Feuchtigkeit verschlechtert werden.In the figure i, a spray head is shown, which consists of a die 1 and a mandrel 2, at least in the area of the die outlet with longitudinally extending Serrated 3 is provided on the inside of the extruded plastic tube 4 produce longitudinal ribs 5 The mandrel 2 is designed as a hollow mandrel, see above that a metal tube 6 to be sheathed can be passed through the cavity. The extruded plastic hose 4 lies down after leaving of the spray head firmly on the metal tube 6 due to its shrinkage. the Cavities formed by the prongs 3 on the mandrel 2 give the metal tube good thermal properties and acoustic insulation properties, which, however, deteriorate when exposed to moisture will.

Durch schnelles Drehen des Dornes 2 in Umfangsrichtung wird erreicht, daß die einzelnen längsverlaufenden Rippen 5,wie in Figur 5 und 6 an Hand einer aufgeklappten Isolierhülle dargestellt, an ihren Flanken miteinander verschweissen - wie bei 7 dargestellt - so daß eine Vielzahl in sich geschlossener Hohlräume 8 entsteht. Der Drehsinn des Dornes 2 kann gleich sein, der Dorn 2 kann aber auch in wechselnder Richtung gedreht werden. Wesentlich ist, daß die Abzugsgeschwindigkeit des Rohres, die Breite der Rippen 5, ihr Abstand zueinander sowie die Winkelgeschwindigkeit des Domes 2 so aufeinander abgestimmt sind, daß eine Verschweißung ermöglicht wird. Die Isolierhülle nach der Figur 6 kann mittels eines schwingenden Drehantriebes des Dorns erzeugt werden, wobei der Dorn beispielsweise durch einen Elektromagneten angetrieben sein kann.By quickly turning the mandrel 2 in the circumferential direction, that the individual longitudinal ribs 5, as in Figures 5 and 6 on the basis of a opened insulating sleeve shown, welded together on their flanks - as shown at 7 - so that a large number of self-contained cavities 8 arises. The direction of rotation of the mandrel 2 can be the same, but the mandrel 2 can also be rotated in alternating directions. It is essential that the withdrawal speed of the tube, the width of the ribs 5, their distance from one another and the angular velocity of the dome 2 are coordinated so that welding is possible. The insulating sleeve according to FIG. 6 can be made by means of an oscillating rotary drive of the mandrel, the mandrel, for example, by an electromagnet can be driven.

In der Figur 3 ist eine Vorrichtung dargestellt, mit der es möglich ist, eine Isolierhülle, die in Figur 4 aufgeklappt ist, herzustellen. Die längsverlaufenden Hohlräume zwischen den Rippen 5 sind hier durch Stopfen 9 unterbrochen, so daß auch hier in sich abgeschlossene Hohlräume 8 entstehen. Der Dorn 2 wird während des Spritzvorganges in bestimmten Zeitabständen relativ zur Matrize 1 bewegt. Die Bewegung des Dorns kann elektrisch, hydraulisch, pneumatisch oder mechanisch beispielsweise durch einen Extruder 10 gesteuert werden. Koaxial zu dem Dorn 2 ist eine Buchse il angeordnet, die mittels der Feder 12 gelagert ist und bei Bewegung des Dornes 2 in entgegengesetzter Richtung zu diesen bewegt wird. Durch diese Buchse 11 wird ein Druckausgleich im Innern des Spritzkopfes geschaffen.In the figure 3 a device is shown with which it is possible is to produce an insulating sleeve, which is unfolded in FIG. The longitudinal ones Cavities between the ribs 5 are interrupted here by plugs 9, so that too here self-contained cavities 8 arise. The mandrel 2 is during the injection process moved relative to the die 1 at certain time intervals. The movement of the thorn can be electrical, hydraulic, pneumatic or mechanical, for example by a Extruder 10 can be controlled. A bushing il is arranged coaxially to the mandrel 2, which is mounted by means of the spring 12 and when the mandrel moves 2 is moved in the opposite direction to these. Through this socket 11 is a pressure equalization created inside the spray head.

Mit Hilfe der erfindungsgemäßen Vorrichtung ist es nunmehr möglich, kontinuierlich Isolierhüllen auf Rohre zu spritzen, die längswasserdicht sind und somit wesentlich bessere Isoliereigenschaften aufweisen.With the aid of the device according to the invention it is now possible continuously spraying insulating sleeves onto pipes that are longitudinally watertight and thus have much better insulating properties.

Claims (5)

Patentansprüche Claims t) Spritzwerkzeug zur Herstellung eines Isoliermantels für wärmeisolierte Leitungsrohre, der auf der dem Rohr zugekehrten Innenfläche angebrachte Vorsprünge in Form von in axialer Richtung verlaufender Rippen aufweist, bestehend aus einer Matrize und einem in die Bohrung der Matrize hineinragenden Dorn, der zumindest in dem in die Matrizenbohrung hineinragenden Bereich mit die Form und Anzahl der Rippen im Negativ aufweisenden Zacken versehen ist, dadurch gekennzeichnet, daß der Dorn und die Matrize während des Spritzvorganges relativ zueinander axial und/oder in Umfangsrichtung bewegbar sind.t) Injection mold for the production of an insulating jacket for heat-insulated Line pipe, the protrusions attached to the inner surface facing the pipe in the form of ribs running in the axial direction, consisting of a Die and a mandrel protruding into the bore of the die, which at least in the area protruding into the die bore with the shape and number of Ribs in the negative is provided with serrations, characterized in that the mandrel and the die are axially and / or relative to one another during the injection molding process are movable in the circumferential direction. 2. Spritzwerkzeug nach Anspruch 1, bei dem die Matrize und/oder der Dorn axial bewegbar sind, dadurch gekennzeichnet, daß koaxial zum Dorn eine axial bewegliche, vorzugsweise federnd gelagerte einen Druckausgleich im Innern des Spritzkopfes bewirkende Buchse angeordnet ist.2. Injection tool according to claim 1, wherein the die and / or the The mandrel are axially movable, characterized in that one axially coaxial with the mandrel movable, preferably resiliently mounted, pressure equalization inside the spray head causing bushing is arranged. 3. Spritzwerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Dorn mittels eines Exzenterantriebes axial verschiebbar ist.3. Injection tool according to claim 1 or 2, characterized in that that the mandrel is axially displaceable by means of an eccentric drive. 4. Spritzwerkzeug nach Anspruch 1, bei dem der Dorn gegenüber der Matrize in Umfangsrichtung bewegbar ist, dadurch gekennzeichnet, daß der Dorn in wechselnder Folge drehantreibbar ist, wobei die Austrittsgeschwindigkeit des thermoplastischen Kunststoffes, die Anzahl und die Breite der Rippen sowie die Winkelgeschwindigkeit des Dornes so aufeinander abgestimmt sind, daß die Rippen an ihren Flanken miteinander verschweißen.4. Injection tool according to claim 1, wherein the mandrel opposite the Die is movable in the circumferential direction, characterized in that the mandrel is in alternating sequence can be driven in rotation, the exit speed of thermoplastic plastic, the number and the width of the ribs and the angular velocity of the mandrel are coordinated so that the ribs on their flanks with one another weld. 5. Wärmeisoliertes Leitungsrohr, dessen Mantel auf der dem Rohr zugekehrten Innenfläche Vorsprünge in Form von in axialer Richtung verlaufenden Rippen aufweist, hergestellt mit einem Spritzwerkzeug gemäß Anspruch 4, dadurch gekennzeichnet, daß die Rippen in Abständen an ihren Flanken zu wasserdichten Stopfen verschweißt sind, in deren Bereich die Rippen quer gekrümmt oder schräg verlaufen.5. Heat-insulated conduit pipe with its jacket on the one facing the pipe Inner surface has projections in the form of ribs running in the axial direction, produced with an injection molding tool according to claim 4, characterized in that the ribs are welded at intervals on their flanks to form watertight plugs, in the area of which the ribs are curved or inclined transversely. L e e r s e i t eL e r s e i t e
DE19712109497 1971-03-01 1971-03-01 Pipe sleeving extrusion - produces internal ribs in insulating sleeve with intermittent barriers joining ribs Pending DE2109497A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19712109497 DE2109497A1 (en) 1971-03-01 1971-03-01 Pipe sleeving extrusion - produces internal ribs in insulating sleeve with intermittent barriers joining ribs
AR237295A AR193617A1 (en) 1971-03-01 1971-08-09 INJECTOR TOOL FOR THE MANUFACTURE OF AN INSULATING SHEATH FOR THERMO-INSULATING CONDUCTING CANES AND CANO MADE WITH SUCH TOOL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712109497 DE2109497A1 (en) 1971-03-01 1971-03-01 Pipe sleeving extrusion - produces internal ribs in insulating sleeve with intermittent barriers joining ribs

Publications (1)

Publication Number Publication Date
DE2109497A1 true DE2109497A1 (en) 1972-09-14

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DE (1) DE2109497A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264102A1 (en) * 1986-10-15 1988-04-20 Smc Corporation Method of continuously manufacturing a double-walled tube assembly
US4978148A (en) * 1985-08-20 1990-12-18 Shoketsu Kinzoku Kogyo Kabushiki Kaisha Coupling for multi-passage tube
WO2006114118A1 (en) * 2005-04-27 2006-11-02 Prysmian Cavi E Sistemi Energia S.R.L. Cable manufacturing process
WO2006114117A1 (en) * 2005-04-27 2006-11-02 Pirelli Tyre S.P.A. Method for extruding a polymeric material and extrusion head therefor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978148A (en) * 1985-08-20 1990-12-18 Shoketsu Kinzoku Kogyo Kabushiki Kaisha Coupling for multi-passage tube
EP0264102A1 (en) * 1986-10-15 1988-04-20 Smc Corporation Method of continuously manufacturing a double-walled tube assembly
WO2006114118A1 (en) * 2005-04-27 2006-11-02 Prysmian Cavi E Sistemi Energia S.R.L. Cable manufacturing process
WO2006114117A1 (en) * 2005-04-27 2006-11-02 Pirelli Tyre S.P.A. Method for extruding a polymeric material and extrusion head therefor
AU2005330979B2 (en) * 2005-04-27 2011-09-15 Prysmian Cavi E Sistemi Energia S.R.L. Cable manufacturing process
CN101166617B (en) * 2005-04-27 2012-01-04 倍耐力轮胎股份公司 Method for extruding a polymeric material and extrusion head therefor
US8147739B2 (en) 2005-04-27 2012-04-03 Prysmian Cavi E Sistemi Energia S.R.L. Cable manufacturing process
US8535033B2 (en) 2005-04-27 2013-09-17 Prysmian Cavi E Sistemi Energia S.R.L. Cable manufacturing process
US8585949B2 (en) 2005-04-27 2013-11-19 Pirelli Tyre S.P.A. Method for extruding a polymeric material
US9120262B2 (en) 2005-04-27 2015-09-01 Pirelli Tyre S.P.A. Apparatus for extruding a polymeric material and extrusion head therefor

Also Published As

Publication number Publication date
AR193617A1 (en) 1973-05-11

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