DE2316835B2 - Method and device for producing a composite pipe from thermoplastics - Google Patents
Method and device for producing a composite pipe from thermoplasticsInfo
- Publication number
- DE2316835B2 DE2316835B2 DE732316835A DE2316835A DE2316835B2 DE 2316835 B2 DE2316835 B2 DE 2316835B2 DE 732316835 A DE732316835 A DE 732316835A DE 2316835 A DE2316835 A DE 2316835A DE 2316835 B2 DE2316835 B2 DE 2316835B2
- Authority
- DE
- Germany
- Prior art keywords
- outer layer
- plastic
- composite pipe
- layer
- chain
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
- B29C44/16—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining shaped by the expansion of 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
- 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
- B29C44/22—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- 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
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
-
- 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
- B29C48/16—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
- 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
- B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
- B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/94—Lubricating
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
-
- 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
- B29L2016/00—Articles with corrugations or pleats
-
- 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
- B29L2023/18—Pleated or corrugated hoses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
Gegenstand der Erfindung ist ein Verfahren der im Oberbegriff des Anspruches 1 angegebenen Art sowie eine Vorrichtung zum Durchführen eines erfindungsgemäßen Verfahrens.The invention relates to a method of the type specified in the preamble of claim 1 and a device for performing a method according to the invention.
Ein Verbundrohr aus thermoplastischen Kunststoffen, welches eine quergewellte Außenschicht und eine geschäumte, in die Wellung der Außenschicht eingreifende Innenschicht mit im wesentlichen glatter Innenfläche aufweist, hat eine Reihe vorteilhafter Eigenschaften. So ist durch die Querwellen eine relativ hohe Widerstandsfähigkeit gegen ein Zusammendrücken des Verbundrohres und auch gegen Innendruck gegeben, und durch die glatte innenfläche ein geringer Durchflußwiderstand beim Hindurchleiten von Gasen und Flüssigkeiten; weiter ergeben sich durch die glatte Innenfläche auch bei gebogenem Verlauf des Verbundrohres kaum Schwierigkeiten beim Einziehen von Kabeln oder Drähten; zudem kann trotz des Eingreifens der geschäumten Innenschicht in die Wellung der Außenschicht eine gute Flexibilität des Verbundrohres erhalten werden, und es ist auch eine gute Wärmeisolierung bei solchen Verbundrohren gegeben.A composite pipe made of thermoplastics, which has a transversely corrugated outer layer and a foamed inner layer engaging in the corrugation of the outer layer with a substantially smooth inner surface has a number of advantageous properties. So is a relatively high one due to the transverse waves Resistance to compression of the composite pipe and also to internal pressure is given, and due to the smooth inner surface, a low flow resistance when passing gases and Liquids; the smooth inner surface also results in a curved profile of the composite pipe hardly any difficulty pulling in cables or wires; moreover, despite the intervention the foamed inner layer in the corrugation of the outer layer a good flexibility of the composite pipe can be obtained, and there is also good thermal insulation in such composite pipes.
Bei einem aus der DE-OS 20 42 031 bekannten Verfahren zum Herstellen eines Verbundrohres, welches wie vorstehend erläutert ausgebildet ist, wird zunächst der der Bildung der äußeren Schicht des Verbundrohres dienende, glatt extrudierte Schlauch mittels dem Schlauchinneren zugeführter Druckluft an eine Formkette angepreßt und dadurch mit Querwellen versehen, und danach wird in einer zweiten Verfahrensstufe in den so profilierten Schlauch die innere Schicht aus schäumendem Kunststoff eingebracht. Hierbei ergeben sich insbesondere durch die Zufuhr der Druckluft und durch die Notwendigkeit, den Rohrbereich, in dem die Druckluft wirkt, abzudichten, mannigfache Schwierigkeiten.In a method known from DE-OS 20 42 031 for producing a composite pipe which is formed as explained above, the formation of the outer layer of the Compound pipe serving, smoothly extruded hose by means of compressed air supplied to the inside of the hose a molded chain is pressed on and thereby provided with transverse waves, and then in a second process step the inner layer is formed in the tube so profiled Introduced from foaming plastic. This results in particular from the supply of Compressed air and the need to seal the pipe area in which the compressed air acts, manifold difficulties.
Aufgabe der vorliegenden Erfindung ist e«, ein Verfahren der eingang: genannten Art zu schaffen, mitThe object of the present invention is to create a method of the type mentioned at the beginning, with
ίο dem ein Verbundrohr nach der Erfindung einfacher und betriebssicher hergestellt werden kann. Diese Aufgabe ist erfindungsgemäß durch die im kennzeichnenden Teil des Anspruches 1 angeführten Maßnahmen gelöst. Durch das erfindungsgemäße Verfahren wird gegenüber dem bekannten Verfahren der Aufbau der zur Herstellung des Verbundrohres erforderlichen Vorrichtung wesentlich vereinfacht, und es fallen Komplikationen, die mit der Regelung der beim bekannten Verfahren erforderlichen Druckluftzufuhr einhergehen, weg; darüberhinaus ergibt sich daraus, daß der Schäumdruck des schäumbaren Kunststoffes die äußere Schicht nicht abrupt, wie die im bekannten Fall vorgesehene Druckluft, sondern allmählich und gleichmäßig an die Formkette andrückt, eine sehrgleichmäßige Verformung der äußeren Schichtίο which a composite pipe according to the invention easier and can be made operationally reliable. According to the invention, this object is achieved by the characterizing part of claim 1 cited measures solved. The inventive method is opposite the known method of the construction of the device required for the production of the composite pipe much simplified, and there are complications with the regulation of the known Procedure required compressed air supply go hand in hand; it also follows that the Foaming pressure of the foamable plastic does not abruptly make the outer layer, as is the case in the known case provided compressed air, but gradually and evenly presses against the mold chain, a very even Deformation of the outer layer
Läßt man, wie dies beim erfindungsgemäßen Verfahren gegebenenfalls vorgesehen ist, in Kombination mit dem auf die Innenfläche der äußeren Schicht des Verbundrohres einwirkenden Schäumdruck einen Un-Is left, as is optionally provided in the process according to the invention, in combination with the foaming pressure acting on the inner surface of the outer layer of the composite pipe
jo terdruck auf die Außenseite der äußeren Schicht einwirken, läßt sich insbesondere die Biegsamkeit des hergestellten Verbundrohres weiter verbessern. Es ist auf diesem Wege weiter auch möglich, eine Ersparnis an Schaumkunststoff bzw. an Treibmittel zu erzielen, undjo terprint on the outside of the outer layer act, in particular the flexibility of the composite pipe produced can be further improved. It is in this way also possible to achieve a saving in foam plastic or propellant, and
ii man kann auf diese Weise eine besonders leichte Innenschicht aus Schaumkunststoff erhalten.ii you can do a particularly easy one in this way Inner foam plastic layer obtained.
Eine weitere Verbesserung des erfindungsgemäßen Verfahrens kann man erzielen, wenn man die äußere Schicht vor dem Verformen inijonkalibriert; hierbeiA further improvement of the process according to the invention can be achieved if the external Layer calibrated inijon before deforming; here
4i) wirkt sich sowohl die Verbesserung der Maßhaltigkeit des der Schäumdruckverformung zu unterwerfenden, noch glatten äußeren Schicht als auch die Aufteilung der die Festigkeit erhöhenden Querreckung der äußeren Schicht auf zwei Stufen, nämlich Innenkalibrierung und4i) affects both the improvement in dimensional stability of the still smooth outer layer to be subjected to the foaming pressure deformation and the division of the Strength-increasing transverse stretching of the outer layer in two stages, namely internal calibration and
-ti Schäumdruckverformung, für die Schäumdruckverformung dahingehend günstig aus, daß ein geringerer Schäumdruck ausreicht und damit auch eine leichtere Innenschicht erzielt werden kann. Für diese Technik ist auch die erfindumgsgemäße Vorrichtung, die Gegen--ti foaming pressure deformation, for foaming pressure deformation favorable in that a lower foaming pressure is sufficient and thus also a lighter one Inner layer can be achieved. For this technology, the device according to the invention, the counter-
ΐ<> stand des Anspruches 3 ist, bestimmt.ΐ <> status of claim 3 is determined.
In der Zeichnung sind zwei Ausführungsbeispiele des Gegenstandes der Erfindung dargestellt. Es zeigtIn the drawing, two exemplary embodiments of the subject matter of the invention are shown. It shows
Fig. 1 einen Längsschnitt einer Vorrichtung zum Herstellen eines zweischichtigen Verbundrohres und1 shows a longitudinal section of a device for producing a two-layer composite pipe and
v> F i g. 2 einen Längsschnitt einer Vorrichtung zum Herstellen eines zweischichtigen Verbundrohres. v> F i g. 2 shows a longitudinal section of a device for producing a two-layer composite pipe.
Gemäß Fig. 1 wird eine glatte äußere Schicht 7 aus thermoplastischem Kunststoff mittels eines Extruderkopfes 1 extrudiert und über einen Formdorn 2 einerAccording to Fig. 1, a smooth outer layer 7 is made of thermoplastic material extruded by means of an extruder head 1 and a mandrel 2 a
M) Hohlform zugeführt, die aus zwei mitlaufenden Formketten 8 besteht, die ihrerseits aus einzelnen Matrizen 3 gebildet sind. Der Formdorn 2 weist eine zentrale Bohrung 5 auf, durch die schäumender Kunststoff für eine innere Schicht 6 und — falls erforderlich —M) Hollow mold supplied, which consists of two concurrent mold chains 8, which in turn are formed from individual matrices 3. The mandrel 2 has a central one Hole 5 through which foaming plastic for an inner layer 6 and - if necessary -
j5 Fördergas zugeführt werden. Der schäumbare Kunststoff wird von innen an die glatt vom Extruderkopf kommende schlauchförmige Schicht 7 gesprüht und schäumt auf. Durch die Expansion des Schaumkunststof-j5 conveying gas are supplied. The foamable plastic is sprayed from the inside onto the tubular layer 7 coming smoothly from the extruder head and foams up. Due to the expansion of the foam plastic
fes, der durch den Formdorn 2 an einem Ausweichen nach innen gehindert ist, wird die zunächst noch glatte schlauchförmige äußere Schicht 7 nach außen in Ausnehmungen der aus den Matrizen 3 gebildeten Formkelten 8 gepreßt und erhält dadurch eine quergewellte Form. Der Durchmesser des Formdornes 2 nimmt vom Ende des Extruderkopfes 1, an den der Formdorn 2 anschließt, zunächst zu, wobei durch diese Durchmesserzunahme die noch glatte Schicht 7 auf ihrem Weg zu den Formketten 8 einer Aufweitung und Innen-Kalibrierung unterworfen ist, und bleibt dann im Bereich der aus den Matrizen 3 gebildeten Formketten 8, wo die Schicht 7 durch den Schäumdruck eine Querwellung erhält, konciant.fes, which is prevented from deflecting inward by the mandrel 2, is initially still smooth tubular outer layer 7 to the outside in recesses formed from the dies 3 Moldings 8 pressed and thereby receives a transversely corrugated shape. The diameter of the mandrel 2 initially increases from the end of the extruder head 1, to which the mandrel 2 is connected, through this The still smooth layer 7 increases in diameter on its way to the shape chains 8 and widening Indoor calibration is subject to, and then remains in Area of the mold chains 8 formed from the matrices 3, where the layer 7 is a Transverse corrugation received, concave.
Nach dem zweiten Ausführungsbeispiel der Vorrichtung (Fig.2) wird eine äußere Schicht 111 aus nichtschäumbarem Kunststoff durch einen äußeren Kanal J4 eines Extruderkopfes 15 extrudiert, eine innere Schicht 12 aus schäumbarem Kunststoff durch einen inneren Kanal 16 des Extruderkopfes 15 und e;ne innerste Schicht 13 aus nicht schäumbarem Kunststolf durch Bohrungen 18 eines aus Polytetrafluoräthylen ι bestehenden Fornidornes 19 gefördert.According to the second exemplary embodiment of the device (FIG. 2), an outer layer 111 is made of Non-foamable plastic extruded through an outer channel J4 of an extruder head 15, an inner one Layer 12 of foamable plastic through an inner channel 16 of the extruder head 15 and e; ne innermost layer 13 made of non-foamable plastic through holes 18 made of polytetrafluoroethylene ι existing Fornidornes 19 promoted.
Der schäumbare Kunststoff für die innere Schicht 12 schäumt nach dem Verlassen des inneren Kanals 16 und nach dem Eintreten der noch glatten äußeren Schicht 11 in eine aus einzelnen Matrizen 20 besieherdeThe foamable plastic for the inner layer 12 foams after leaving the inner channel 16 and after the still smooth outer layer 11 has entered in one of individual matrices 20 besieherde
ίο umlaufende Formkette 9 auf, erzeugt einen Druck gegen die innerste Schicht 13 i;nd gegen die äußere Schicht II und preßt die äußere Schicht 11 gegen die umlaufende, alle drei Schichten 11,12 und 13 von außen umfassende Formkette 9. Die äußere Schicht 11 wirdίο revolving shape chain 9 generates a pressure against the innermost layer 13 i; nd against the outer layer II and presses the outer layer 11 against the circumferential, all three layers 11, 12 and 13 from the outside comprehensive mold chain 9. The outer layer 11 is
ij dabei in Ausnehmungen der Matrizen 20 gepreßt und so mit Querwellen versehen, während die innerste Schicht 13 gegen den zylindrischen Formdo-n 19 gedrückt und daher zylindrisch und glatt geformt w, ird.ij pressed into recesses in the dies 20 and so on provided with transverse waves, while the innermost layer 13 is pressed against the cylindrical Formdo-n 19 and therefore cylindrical and smooth in shape.
Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT893272A AT352386B (en) | 1972-10-19 | 1972-10-19 | METHOD AND DEVICE FOR THE CONTINUOUS MANUFACTURING OF PLASTIC PIPES COMPOSING AT LEAST TWO LAYERS WITH TRANSVERSAL PROFILES |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2316835A1 DE2316835A1 (en) | 1974-04-25 |
DE2316835B2 true DE2316835B2 (en) | 1979-03-08 |
DE2316835C3 DE2316835C3 (en) | 1979-10-31 |
Family
ID=3609734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2316835A Expired DE2316835C3 (en) | 1972-10-19 | 1973-04-04 | Method and device for producing a composite pipe from thermoplastics |
Country Status (4)
Country | Link |
---|---|
AT (1) | AT352386B (en) |
BE (1) | BE806223A (en) |
CH (1) | CH556232A (en) |
DE (1) | DE2316835C3 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1252680B (en) * | 1991-11-13 | 1995-06-23 | Sviluppo Settori Impiego Srl | PROCEDURE FOR THE PRODUCTION OF POLYMERIC MATERIAL BODIES INCLUDING A CORE OF EXPANDED MATERIAL ENCLOSED BY AN EXTERNAL SHELL, AND A DEVICE USED IN SUCH PROCEDURE |
DE4325021C1 (en) * | 1993-07-26 | 1995-03-02 | Unicor Rohrsysteme Gmbh | Method and device for producing finned tubes made of plastic |
DE19629678A1 (en) * | 1996-07-23 | 1998-01-29 | Brugg Rohrsysteme Gmbh | Corrugated pipe with double walls enclosing foam insulation |
DE102007054269A1 (en) * | 2007-11-14 | 2009-05-28 | Jarus Gmbh | Thermally insulated conduit and process for its manufacture |
TR201614668A2 (en) * | 2016-10-18 | 2018-04-24 | Canlar Boru Profil Plastik Elekt Ins Mak Nak Sanayi Ve Ticaret Ltd Sirketi |
-
1972
- 1972-10-19 AT AT893272A patent/AT352386B/en not_active IP Right Cessation
-
1973
- 1973-04-02 CH CH484973A patent/CH556232A/en not_active IP Right Cessation
- 1973-04-04 DE DE2316835A patent/DE2316835C3/en not_active Expired
- 1973-10-18 BE BE2053156A patent/BE806223A/en unknown
Also Published As
Publication number | Publication date |
---|---|
ATA893272A (en) | 1979-02-15 |
CH556232A (en) | 1974-11-29 |
DE2316835A1 (en) | 1974-04-25 |
DE2316835C3 (en) | 1979-10-31 |
AT352386B (en) | 1979-09-10 |
BE806223A (en) | 1974-02-15 |
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