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DE3903436A1 - Process for producing plastic pipes - Google Patents

Process for producing plastic pipes

Info

Publication number
DE3903436A1
DE3903436A1 DE3903436A DE3903436A DE3903436A1 DE 3903436 A1 DE3903436 A1 DE 3903436A1 DE 3903436 A DE3903436 A DE 3903436A DE 3903436 A DE3903436 A DE 3903436A DE 3903436 A1 DE3903436 A1 DE 3903436A1
Authority
DE
Germany
Prior art keywords
coating
oxygen barrier
extrusion
layer
base body
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
DE3903436A
Other languages
German (de)
Other versions
DE3903436C2 (en
Inventor
Des Erfinders Auf Nennung Verzicht
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.)
BECKER PLASTICS GMBH, 45711 DATTELN, DE
Original Assignee
BECKER PRUENTE GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6371714&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3903436(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BECKER PRUENTE GmbH filed Critical BECKER PRUENTE GmbH
Priority to DE3903436A priority Critical patent/DE3903436C2/en
Publication of DE3903436A1 publication Critical patent/DE3903436A1/en
Application granted granted Critical
Publication of DE3903436C2 publication Critical patent/DE3903436C2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
    • B29C2035/0877—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0875—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation
    • B32B2310/0887—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Landscapes

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

Abstract

In a process for producing plastic pipes, in particular for underfloor heating installations and for drinking water supply, which are composed of a basic polyethylene body, a bonding agent layer applied on the outer circumference of this basic body and a layer applied on this bonding agent layer as an oxygen barrier, it is provided according to the invention that after the extrusion of the basic body and the coating with bonding agent and oxygen barrier layer the finished plastic pipe is crosslinked.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Kunststoffrohren, insbesondere für Fußbodenheizungsan­ lagen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing Plastic pipes, especially for underfloor heating were according to the preamble of claim 1.

Beispielsweise werden derartige Rohre bei der Installa­ tion von Fußbodenheizungen verwendet. Die Beschichtung mit einer Sauerstoffsperre, z. B. aus EVOH ist not­ wendig, um Sauerstoffdiffusion durch das Rohr in das Heizwasser zu verhindern, die zu Korrosion der Metall­ teile der Heizanlage führt.For example, such pipes are used in the Installa tion of underfloor heating used. The coating with an oxygen barrier, e.g. B. from EVOH is not necessary manoeuvrable to oxygen diffusion through the tube into the Prevent heating water from causing corrosion to the metal parts of the heating system.

Bisher wurde zunächst der Rohrgrundkörper aus Poly­ ethylen hergestellt. Dieses Basisrohr wurde dann einer Vernetzung unterworfen. Erst danach konnte die Haftver­ mittlerschicht und die Sauerstoffsperrschicht aufge­ bracht werden.So far, the basic pipe body was made of poly made of ethylene. This base tube then became one Subject to networking. Only then could the Haftver middle layer and the oxygen barrier layer exposed be brought.

Als Vernetzungsverfahren sind zwei grundsätzliche Arten bekannt. Zum einen die chemische Vernetzung und zum anderen die physikalische Vernetzung. Bei der chemischen Vernetzung müssen zur Verknüpfung der Polyethylen-Faden­ moleküle Chemikalien zugesetzt werden, wodurch, je nach Verfahren, noch Zersetzungsprodukte im Endprodukt vor­ kommen können. There are two basic types of networking methods known. On the one hand chemical crosslinking and on the other others physical networking. With the chemical Crosslinking must be used to link the polyethylene thread Molecular chemicals are added, which, depending on Process, still decomposition products in the final product can come.  

Daher bietet die physikalische Vernetzung Vorteile, da keine Chemikalien benötigt werden. Das vernetzte Poly­ ethylenrohr ist deshalb frei von Resten von Vernetzungs­ chemikalien und daher toxisch einwandfrei.Therefore, physical networking offers advantages because no chemicals are needed. The networked poly Ethylene pipe is therefore free of cross-linking residues chemicals and therefore perfectly toxic.

Als physikalisches Vernetzungsverfahren wird bislang nur die Elektronenstrahlvernetzung praktiziert. Dabei wird das Polyethylenrohr mit energiereichen Elektronen beschossen, wobei die Vernetzung erfolgt. In der Praxis wird dabei das Rohr mit einer bestimmten Geschwindigkeit unter einem oder mehreren gerichteten Elektronenstrahl­ büscheln aus einer Elektronenbeschleunigungsanlage durchgezogen und gleichzeitig mehrfach gedreht. Dadurch erhält man eine Vernetzung der Molekülketten, die über die Länge und den Umfang des Rohres gleichmäßig ist und in dieser Gleichmäßigkeit des Vernetzungsgrades von keinem anderen Verfahren übertroffen wird. Ein weiteres wesentliches Merkmal dieses Vernetzungsverfahrens ist die Temperatur, bei welcher die Vernetzung stattfindet. Sie liegt wesentlich unterhalb des Kristallitschmelz­ bereichs von Polyethylen. Somit bleibt die für gewisse Rohreigenschaften vorteilhafte Struktur des unvernetzten Rohres bei der Vernetzung praktisch unverändert er­ halten. Die amorphen Bereiche, also die Schwachstellen des Polyethylens werden vernetzt, während die kristal­ linen, d. h. stabileren Bereiche erhalten bleiben. Die kristalline Matrix wirkt somit wie eine Pseudover­ netzung. Diese Vorteile können aber durch die anschlie­ ßende Beschichtung des Polyethylengrundkörpers teilweise zunichte gemacht werden. Denn das zuvor vernetzte Polyethylenrohr wird naturgemäß beim Beschichten erneut aufgeheizt, wodurch gewisse Veränderungen in der Molekülstruktur des Rohres auftreten können.So far, as a physical networking method only practiced electron beam crosslinking. Here becomes the polyethylene tube with high-energy electrons bombarded with networking. In practice the tube will run at a certain speed under one or more directed electron beams bundle from an electron acceleration system pulled through and rotated several times at the same time. Thereby one obtains a cross-linking of the molecular chains that over the length and the circumference of the tube is uniform and in this uniformity of the degree of crosslinking no other process is surpassed. Another one is an essential feature of this networking process the temperature at which the crosslinking takes place. It is significantly below the crystallite melt range of polyethylene. So it remains for certain Pipe properties advantageous structure of the uncrosslinked Rohres practically unchanged in networking hold. The amorphous areas, i.e. the weak points of the polyethylene are cross-linked, while the crystalline linen, d. H. more stable areas are preserved. The crystalline matrix thus acts as a pseudo  networking. However, these advantages can be partial coating of the polyethylene base be nullified. Because the previously networked Polyethylene pipe is naturally renewed when coating heated up, causing certain changes in the Molecular structure of the tube can occur.

Außerdem können bei der Beschichtung Inhomogenitäten auftreten. Es können sich Blasen bilden. Dadurch ist die Verbindung der Sauerstoffsperrschicht mit dem Basisrohr nicht optimal ausgebildet und die Funktion der Sauer­ stoffsperre auf Dauer in Frage gestellt.In addition, inhomogeneities can occur in the coating occur. Bubbles can form. This is the Connection of the oxygen barrier layer to the base pipe not optimally trained and the function of the Sauer Material barrier permanently challenged.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art so zu führen, daß ein homogenes, mit einer Sauerstoffsperrschicht ver­ sehenes Kunststoffrohr entsteht.The invention is therefore based on the object To carry out procedures of the type mentioned in such a way that a homogeneous ver with an oxygen barrier see plastic tube is created.

Die Erfindung löst diese Aufgabe mit Hilfe der Merkmale des kennzeichnenden Teils des Anspruchs 1. Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegen­ stand der Unteransprüche.The invention solves this problem with the aid of the features of the characterizing part of claim 1. Further advantageous embodiments of the invention are counter stood the subclaims.

Gemäß dem erfindungsgemäßen Verfahren wird zunächst das Rohr komplett hergestellt. D. h. auf einen unvernetzten Polyethylengrundkörper wird die Haftvermittlerschicht und die Sauerstoffsperrschicht aufgebracht. Dieses Halbfertigprodukt wird dann vernetzt, vorzugsweise gemäß Anspruch 2 durch eine Elektronenstrahlvernetzung. Dadurch wird die Verbindung zwischen der Sauerstoff­ sperrschicht aus beispielsweise EVOH und dem Poly­ ethylenbasisrohr so homogen, daß man das fertige Rohr praktisch als einteilig bezeichnen kann, da bei der Extrusion und der Beschichtung des Rohres eventuell aufgetretene Störstellen durch die abschließende Ver­ netzung beseitigt werden, wobei Basisrohr, Haftver­ mittler und Sperrschicht vernetzt sind.According to the method according to the invention, the Pipe completely manufactured. I.e. to an unconnected The adhesive layer is made of polyethylene and applied the oxygen barrier. This  Semi-finished product is then crosslinked, preferably according to claim 2 by electron beam crosslinking. This creates the connection between the oxygen barrier layer made of, for example, EVOH and the poly ethylene base pipe so homogeneous that you get the finished pipe can be described practically as one piece, since the Extrusion and the coating of the pipe possibly Occurrence of defects by the final Ver Wetting can be eliminated, with the base tube, adhesive middle and barrier layer are networked.

Um das Verfahren noch effizienter und kürzer zu gestal­ ten, schlägt der Anspruch 3 vor, daß gleichzeitig mit der Extrusion des Grundkörpers die Beschichtung mit Haftvermittler und Sauerstoffsperrschicht stattfindet.To make the process even more efficient and shorter ten, claim 3 proposes that at the same time the extrusion of the base body with the coating Adhesion promoter and oxygen barrier layer takes place.

Das kann nach Anspruch 4 dadurch erreicht werden, daß die Herstellung des Grundkörpers und die Beschichtung durch Co-Extrusion on-line durchgeführt werden. Bei diesem Verfahren sind drei Extruder einander zugeordnet, von dem der eine die Extrusion des Basisrohrs und die beiden anderen die Extrusion von Haftvermittler und Sperrschicht bewirken.This can be achieved according to claim 4 in that the manufacture of the base body and the coating be carried out on-line by co-extrusion. At three extruders are assigned to one another in this process, one of which is the extrusion of the base tube and the the other two are the extrusion of adhesion promoter and Cause barrier layer.

Gemäß Anspruch 5 ist es jedoch auch möglich, daß die Beschichtung und Extrusion in einem Extruderkopf statt­ findet. Die Grundmaterialien werden dem Extruderkopf so zugeführt, daß aus ihm das fertig beschichtete Rohr hervorgeht.According to claim 5, however, it is also possible that the Coating and extrusion take place in one extruder head finds. The basic materials are the extruder head  fed that from him the finished coated tube emerges.

In jedem Fall entsteht schon bei der Extrusion ein im wesentlichen homogenes Rohr, so daß nur noch ein zu­ sätzlicher Verfahrensschritt, nämlich die Vernetzung, stattfinden muß, um das Endprodukt zu erreichen.In any case, an im is created during the extrusion essentially homogeneous tube, so that only one too additional procedural step, namely networking, must take place to reach the end product.

Beispiel:Example:

Das Rohr, welches aus den Materialien PE-MD bzw. PE-MD mit den funktionellen Gruppen PE-ter-polymer bzw. PE-co-polymer mit einer Sauerstoffsperre aus Ethylen­ vinyl-Alkohol (EVOH) besteht, wird in einem Extruder bei einer Temperatur von 205 Grad Celsius hergestellt. Nach der Extrusion wird das Rohr einer Elektronenstrahl­ vernetzung unterworfen, wobei die Elektronenbeschleu­ nigerspannung 4,5 MeV beträgt und die Strahlendosis 10 Mrad beträgt. Es wird ein Vernetzungsgrad (Gel-Gehalt) von 65 bis 70% erreicht.The pipe, which is made of PE-MD or PE-MD with the functional groups PE-ter-polymer or PE co-polymer with an oxygen barrier made of ethylene vinyl alcohol (EVOH) is made in an extruder manufactured at a temperature of 205 degrees Celsius. After extrusion, the tube becomes an electron beam subjected to crosslinking, the electron acceleration niger voltage is 4.5 MeV and the radiation dose Is 10 Mrad. It becomes a degree of networking (Gel content) of 65 to 70%.

Claims (5)

1. Verfahren zur Herstellung von Kunststoff­ rohren, insbesondere für Fußbodenheizungs­ anlagen und für die Trinkwasserversorgung, die aus einem Polyethylengrundkörper, einer auf dem Außenumfang dieses Grundkörpers auf­ gebrachten Haftvermittlerschicht und auf dieser aufgebrachten Schicht als Sauerstoff­ sperre aufgebaut sind, dadurch gekennzeich­ net, daß nach der Extrusion des Grundkör­ pers und der Beschichtung mit Haftvermittler und Sauerstoffsperrschicht das fertige, aus mehreren Schichten bestehende Kunststoff­ rohr vernetzt wird.1. Process for the production of plastic pipes, in particular for underfloor heating systems and for drinking water supply, which are constructed from a polyethylene base body, an adhesive layer on the outer periphery of this base body and applied to this layer as an oxygen barrier, characterized in that after the Extrusion of the basic body and the coating with adhesion promoter and oxygen barrier layer, the finished, multi-layer plastic pipe is cross-linked. 2. Verfahren nach Anspruch 1, dadurch gekenn­ zeichnet, daß das fertige Rohr einer Elek­ tronenstrahlvernetzung unterworfen wird.2. The method according to claim 1, characterized records that the finished tube of an elec is subjected to electron beam crosslinking. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß gleichzeitig mit der Extrusion des Grundkörpers die Beschichtung mit Haftvermittler und Sauerstoffsperr­ schicht stattfindet.3. The method according to claim 1 or 2, characterized characterized in that simultaneously with the Extrusion of the base body the coating with adhesion promoter and oxygen barrier layer takes place. 4. Verfahren nach Anspruch 3, dadurch gekenn­ zeichnet, daß die Herstellung des Grundkör­ pers und die Beschichtung durch Co-Extrusion über ein oder mehrere Extruder-Köpfe durch­ geführt werden.4. The method according to claim 3, characterized records that the production of the Grundkör pers and the coating by co-extrusion  through one or more extruder heads be performed. 5. Verfahren nach Anspruch 3, dadurch gekenn­ zeichnet, daß die Verbindung von Grund­ körper und Beschichtung bereits im Extruder­ kopf des Extruders stattfindet.5. The method according to claim 3, characterized records that the connection from scratch body and coating already in the extruder head of the extruder takes place.
DE3903436A 1989-01-07 1989-02-06 Process for the production of plastic pipes Expired - Lifetime DE3903436C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3903436A DE3903436C2 (en) 1989-01-07 1989-02-06 Process for the production of plastic pipes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3900355 1989-01-07
DE3903436A DE3903436C2 (en) 1989-01-07 1989-02-06 Process for the production of plastic pipes

Publications (2)

Publication Number Publication Date
DE3903436A1 true DE3903436A1 (en) 1990-07-12
DE3903436C2 DE3903436C2 (en) 1995-02-02

Family

ID=6371714

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3903436A Expired - Lifetime DE3903436C2 (en) 1989-01-07 1989-02-06 Process for the production of plastic pipes

Country Status (1)

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DE (1) DE3903436C2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998043806A1 (en) * 1997-03-29 1998-10-08 Hewing Gmbh Multi-layer plastic tube
EP2452801A1 (en) * 2010-11-16 2012-05-16 Aarne Heino Production method of plastic pipe in layers
DE102012220150A1 (en) * 2012-11-06 2014-05-22 Fränkische Rohrwerke Gebr. Kirchner Gmbh & Co. Kg Air conditioning tube installation on building component, has air tube main portion that is cooled by corrugated tube provided with corrugated base layer made of plastic carrier material
US9522496B2 (en) 2012-12-04 2016-12-20 Pexcor Manufacturing Company Inc. Production method of plastic pipe in layers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19509613A1 (en) * 1995-03-16 1996-09-19 Rotex Gmbh Moulded prods., esp. hollow tubing etc., with oxygen barrier layer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1141670A (en) * 1967-12-22 1969-01-29 Dow Chemical Co Extrusion die
DE3310294C1 (en) * 1983-03-22 1984-08-16 Amrotex AG, Glarus Process for producing a pipe or tube from a crosslinked polyolefin
DE3504349A1 (en) * 1984-02-08 1985-08-08 Northern Petrochemical Co., Omaha, Nebr. BIAXIALLY ORIENTED OXYGEN AND MOISTURE-RESISTANT CLEARING LAYER FILM AND METHOD FOR THE PRODUCTION THEREOF
EP0280066A2 (en) * 1982-11-29 1988-08-31 American National Can Company Apparatus and method for producing a multi-layered article such as a parison e.g. for making a blowmoulded container

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1141670A (en) * 1967-12-22 1969-01-29 Dow Chemical Co Extrusion die
EP0280066A2 (en) * 1982-11-29 1988-08-31 American National Can Company Apparatus and method for producing a multi-layered article such as a parison e.g. for making a blowmoulded container
DE3310294C1 (en) * 1983-03-22 1984-08-16 Amrotex AG, Glarus Process for producing a pipe or tube from a crosslinked polyolefin
DE3504349A1 (en) * 1984-02-08 1985-08-08 Northern Petrochemical Co., Omaha, Nebr. BIAXIALLY ORIENTED OXYGEN AND MOISTURE-RESISTANT CLEARING LAYER FILM AND METHOD FOR THE PRODUCTION THEREOF

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998043806A1 (en) * 1997-03-29 1998-10-08 Hewing Gmbh Multi-layer plastic tube
US6279614B1 (en) 1997-03-29 2001-08-28 Hewing Gmbh Multi-layer plastic tube
EP2452801A1 (en) * 2010-11-16 2012-05-16 Aarne Heino Production method of plastic pipe in layers
DE102012220150A1 (en) * 2012-11-06 2014-05-22 Fränkische Rohrwerke Gebr. Kirchner Gmbh & Co. Kg Air conditioning tube installation on building component, has air tube main portion that is cooled by corrugated tube provided with corrugated base layer made of plastic carrier material
US9522496B2 (en) 2012-12-04 2016-12-20 Pexcor Manufacturing Company Inc. Production method of plastic pipe in layers

Also Published As

Publication number Publication date
DE3903436C2 (en) 1995-02-02

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