EP0674324A1 - Wire protection tube - Google Patents

Wire protection tube Download PDF

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Publication number
EP0674324A1
EP0674324A1 EP95102935A EP95102935A EP0674324A1 EP 0674324 A1 EP0674324 A1 EP 0674324A1 EP 95102935 A EP95102935 A EP 95102935A EP 95102935 A EP95102935 A EP 95102935A EP 0674324 A1 EP0674324 A1 EP 0674324A1
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EP
European Patent Office
Prior art keywords
tube
soft
polyethylene
pipes
plastic pipe
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
EP95102935A
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German (de)
French (fr)
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EP0674324B1 (en
Inventor
Walter E. Strutz
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.)
Jansen AG
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Jansen AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes

Definitions

  • the present invention relates to plastic pipes, in particular cable protection pipes made of soft polyethylene (soft PE), which have reduced friction when the cables are pulled in.
  • soft PE soft polyethylene
  • Soft PE is understood to be a mixture of low density polyethylene (PELD) and high density polyethylene (PEHD), the PEHD content being less than the PELD content or even zero.
  • PEHD in the sense of this invention is generally understood to mean PE qualities with a density of equal to or greater than approx. 0.930 g / cm3 (23 ° C.), based on the colorless and unfilled base material.
  • these pipes have the disadvantage that the friction when pulling in the cables is relatively high. It has already been tried to reduce the friction. the required pull-in forces through mechanical measures resp. reduce the introduction of lubricants.
  • EF-A-0 359 128 describes a plastic tube extruded in one piece from a thermoplastic molding compound, in particular a cable protection tube, in which the lubricant is incorporated directly into the molding compound.
  • a silicone oil is used as a lubricant in amounts of up to approx. 5% incorporated. This incorporation of silicone oils is particularly suitable for hard polyethylene (PEHD).
  • This incorporation reduces environmental problems caused by the direct leakage of part of the lubricant at the end of the pipe after the cable has been drawn in, and achieves a homogeneous distribution of the same, but the entire molding compound contains a foreign substance that influences the material properties and can also interfere with recycling.
  • cable protection tubes made of pure PEHD have better sliding properties than those made of soft PE. However, they are more expensive and stiffer and are therefore only used for special applications.
  • the aim of the present invention was to provide easy-to-slide plastic pipes made of soft PE, in particular for use as cable protection pipes, and a method for their production.
  • This goal was achieved by providing cable protection pipes made of soft PE with a smooth inner coating, especially made of PEHD.
  • the plastic pipes according to the present invention are coated with PEHD at least in the area of any guides, but preferably continuously.
  • a tube with a continuous inner coating is shown in the figures.
  • Figure 1 shows a cross section through an inventive cable protection tube with an inner layer 1 made of PEHD and an outer layer 2 made of soft PE.
  • Figure 2 shows a longitudinal section through a tube wall.
  • the PEHD coating 1 must have a minimum thickness such that it is easy to slide. Adequate lubricity is already achieved with PEHD layer thicknesses of approx. 0.1 mm, whereby regular application of such thin layer thicknesses places high demands on equipment and process technology. It is therefore usually more economical to choose higher layer thicknesses.
  • the maximum thickness is not critical. However, it is kept as low as possible for reasons of cost and to maintain the flexibility of the pipes.
  • Another advantage of the pipes according to the invention is that they can be produced from recycled polyethylene. As a result of the exclusive use of polyethylene, the pipes can in turn be easily recycled.
  • Such pipes consisting of an inner layer 1 and an outer layer respectively.
  • an outer tube 2 are preferably produced in a co-extrusion process with a conventional extruder.
  • the outer tube 2 is moved in the main extruder.
  • the inner layer 1 is transported through the tube tool via a side extruder and applied as an inner layer through distribution channels.
  • Example Comparison of a conventional soft PE pipe with a pipe coated according to the invention.

Abstract

The outer tube (2) is produced in a main extruder from soft polyethylene and is coated on the inside (1) with a layer of polyethylene of higher density, applied by an auxiliary extruder through distribution channels to a thickness of about 0.3 mm. The total thickness of the tube wall is about 6 mm. Experiments with a tube of 112 mm outer dia. on cables of length 100 to 500 m, about 56% straight and 44% slightly curved, show pulling force requirements consistently between 56% and 60% of those of an unlined soft polyethylene tube.

Description

Die vorliegende Erfindung betrifft Kunststoffrohre, insbesondere Kabelschutzrohre aus Weich-Polyethylen (Weich-PE), die beim Einziehen der Kabel verminderte Reibung aufweisen.The present invention relates to plastic pipes, in particular cable protection pipes made of soft polyethylene (soft PE), which have reduced friction when the cables are pulled in.

Kabelschutzrohre aus Weich-PE sind weit verbreitet. Unter Weich-PE wird im folgenden eine Mischung aus Polyethylen niedriger Dichte (PELD) und Polyethylen hoher Dichte (PEHD) verstanden, wobei der PEHD-Anteil kleiner als der PELD-Anteil oder gar null sein kann. Als PEHD im Sinne dieser Erfindung werden generell PE-Qualitäten mit einer Dichte von gleich oder grösser als ca. 0,930 g/cm³ (23°C), bezogen auf das farblose und nicht gefüllte Basismaterial, verstanden. Diese Rohre weisen jedoch den Nachteil auf, dass die Reibung beim Einziehen der Kabel relativ hoch ist. Es wurde bereits versucht, die Reibung resp. die benötigten Einzugkräfte durch mechanische Massnahmen resp. das Einbringen von Gleitmitteln zu vermindern.Cable protection tubes made of soft PE are widely used. In the following, soft PE is understood to be a mixture of low density polyethylene (PELD) and high density polyethylene (PEHD), the PEHD content being less than the PELD content or even zero. PEHD in the sense of this invention is generally understood to mean PE qualities with a density of equal to or greater than approx. 0.930 g / cm³ (23 ° C.), based on the colorless and unfilled base material. However, these pipes have the disadvantage that the friction when pulling in the cables is relatively high. It has already been tried to reduce the friction. the required pull-in forces through mechanical measures resp. reduce the introduction of lubricants.

Es hat sich nun gezeigt, dass bei mechanischen Massnahmen zur Reibungsverminderung, z.B. Verminderung des Oberflächenkontakts durch Innenprofilierung, diese bei Weich-PE-Rohren sogar oft zunimmt.It has now been shown that mechanical measures to reduce friction, e.g. Reduction of surface contact through internal profiling, which often even increases with soft PE pipes.

Beim Einbringen von üblichen Gleitmitteln ins fertige Rohr ist die homogene Verteilung, resp. der Austritt in die Umwelt, ein Problem und - infolge der Anwesenheit einer zusätzlichen Komponente - wird die Gefahr von unerwünschten Materialbeeinflussungen erhöht.When conventional lubricants are introduced into the finished pipe, the homogeneous distribution or leakage into the environment, a problem and - due to the presence of an additional component - the risk of undesirable material influences is increased.

EF-A-0 359 128 beschreibt ein einstückig aus einer thermoplastischen Formmasse stranggepresstes Kunststoffrohr, insbesonders ein Kabelschutzrohr, bei dem das Gleitmittel direkt in die Formmasse eingearbeitet wird. Als Gleitmittel wird ein Silikonöl in Mengen bis ca. 5 % eingearbeitet. Diese Einarbeitung von Silikonölen ist insbesonders für Hart-Polyethylen (PEHD) geeignet.EF-A-0 359 128 describes a plastic tube extruded in one piece from a thermoplastic molding compound, in particular a cable protection tube, in which the lubricant is incorporated directly into the molding compound. A silicone oil is used as a lubricant in amounts of up to approx. 5% incorporated. This incorporation of silicone oils is particularly suitable for hard polyethylene (PEHD).

Durch diese Einarbeitung werden zwar Umweltprobleme durch direktes Austreten eines Teils des Gleitmittels am Rohrende nach Kabeleinzug vermindert und eine homogene Verteilung desselben erzielt, dafür aber enthält die gesamte Formmasse einen Fremdstoff, der die Materialeigenschaften beeinflusst und auch beim Recyclieren stören kann.This incorporation reduces environmental problems caused by the direct leakage of part of the lubricant at the end of the pipe after the cable has been drawn in, and achieves a homogeneous distribution of the same, but the entire molding compound contains a foreign substance that influences the material properties and can also interfere with recycling.

Es ist bekannt, dass Kabelschutzrohre aus reinem PEHD bessere Gleiteigenschaften aufweisen als solche aus Weich-PE. Sie sind jedoch teurer und steifer und werden deshalb nur für spezielle Applikationen verwendet.It is known that cable protection tubes made of pure PEHD have better sliding properties than those made of soft PE. However, they are more expensive and stiffer and are therefore only used for special applications.

Ziel der vorliegenden Erfindung war es nun, gleitfreudige Kunststoffrohre aus Weich-PE bereitzustellen, insbesonders zur Verwendung als Kabelschutzrohre, sowie ein Verfahren zu deren Herstellung.The aim of the present invention was to provide easy-to-slide plastic pipes made of soft PE, in particular for use as cable protection pipes, and a method for their production.

Dieses Ziel wurde erreicht durch Bereitstellen von Kabelschutzrohren aus Weich-PE mit gleitfreudiger Innenbeschichtung, insbesonders aus PEHD. Die Kunststoffrohre gemäss der vorliegenden Erfindung sind mindestens im Bereich allfälliger Führungen mit PEHD beschichtet, vorzugsweise jedoch durchgehend.This goal was achieved by providing cable protection pipes made of soft PE with a smooth inner coating, especially made of PEHD. The plastic pipes according to the present invention are coated with PEHD at least in the area of any guides, but preferably continuously.

Ein Rohr mit durchgehender Innenbeschichtung ist in den Figuren dargestellt.A tube with a continuous inner coating is shown in the figures.

Figur 1 zeigt einen Querschnitt durch ein erfindungsgemässes Kabelschutzrohr mit einer Innenschicht 1 aus PEHD und einer Aussenschicht 2 aus Weich-PE.Figure 1 shows a cross section through an inventive cable protection tube with an inner layer 1 made of PEHD and an outer layer 2 made of soft PE.

Figur 2 stellt einen Längsschnitt durch eine Rohrwand dar.Figure 2 shows a longitudinal section through a tube wall.

Die PEHD-Beschichtung 1 muss eine solche Mindestdicke aufweisen, dass die Gleitfreudigkeit gewährleistet ist. Ausreichende Gleitfreudigkeit wird bereits mit PEHD-Schichtdicken von ca. 0.1 mm erzielt, wobei eine regelmässige Applikation so geringer Schichtdicken hohe apparative und verfahrenstechnische Anforderungen stellt. Es ist deshalb meist wirtschaftlicher, höhere Schichtdicken zu wählen. Die Maximaldicke ist nicht kritisch. Sie wird jedoch aus Kostengründen und zur Erhaltung der Flexibilität der Rohre möglichst gering gehalten.The PEHD coating 1 must have a minimum thickness such that it is easy to slide. Adequate lubricity is already achieved with PEHD layer thicknesses of approx. 0.1 mm, whereby regular application of such thin layer thicknesses places high demands on equipment and process technology. It is therefore usually more economical to choose higher layer thicknesses. The maximum thickness is not critical. However, it is kept as low as possible for reasons of cost and to maintain the flexibility of the pipes.

Gute Ergebnisse wurden beispielsweise mit einer PEHD-Beschichtung einer Dicke von ca. 0,3 mm erzielt.Good results were achieved, for example, with a PEHD coating with a thickness of approx. 0.3 mm.

In einem Vergleichsversuch zeigten solche mit PEHD beschichtete Weich-PE-Rohre eine Verminderung der Einzugskräfte um ca. 40 %, was die Möglichkeit eröffnet, längere Einzugsstrecken zu überwinden als bis anhin.In a comparative experiment, such soft PE pipes coated with PEHD showed a reduction in the pull-in forces of around 40%, which opens up the possibility of covering longer pull-in distances than before.

Ein weiterer Vorteil der erfindungsgemässen Rohre ist, dass diese aus recycliertem Polyethylen hergestellt werden können. Infolge der ausschliesslichen Verwendung von Polyethylen können die Rohre ihrerseits auch wieder problemlos recycliert werden.Another advantage of the pipes according to the invention is that they can be produced from recycled polyethylene. As a result of the exclusive use of polyethylene, the pipes can in turn be easily recycled.

Solche Rohre, bestehend aus einer Innenschicht 1 und einer Aussenschicht resp. einem Aussenrohr 2, werden vorzugsweise im Co-Extrusions-Verfahren mit einem üblichen Extruder hergestellt.Such pipes, consisting of an inner layer 1 and an outer layer respectively. an outer tube 2, are preferably produced in a co-extrusion process with a conventional extruder.

Das Aussenrohr 2 wird im Hauptextruder gefahren. Die Innenschicht 1 wird über einen Seitenextruder durch das Rohrwerkzeug transportiert und durch Verteilkanäle als Innenschicht aufgetragen.The outer tube 2 is moved in the main extruder. The inner layer 1 is transported through the tube tool via a side extruder and applied as an inner layer through distribution channels.

Beispiel: Vergleich eines üblichen Weich-PE-Rohres mit einem erfindungsgemäss beschichteten Rohr. Example: Comparison of a conventional soft PE pipe with a pipe coated according to the invention. Material: Kabelschutzrohre 112 x 100 mm, Wandstärke total ca. 6 mm Material: cable protection tubes 112 x 100 mm, total wall thickness approx. 6 mm

Typ A:
herkömmliche Weich-PE-Rohre
Typ B:
Weich-PE-Rohre mit gleitfreudiger Innenbeschichtung aus PEHD (ca. 0,3 mm)
Kabel:
Radox-Ceander-Netzkabel GKT/ XKT 3x50/50 mm² Adern vernetzt
Verlegte Gesamtlänge:
je 500 m ca. 280 m gerade, 220 m mit leichter Krümmung

   Die Kabel wurden direkt ab Haspel mittels einer Zugmaschine mit direkter protokollierung der Einziehlänge und der Einziehkraft eingezogen.
Type A:
conventional soft PE pipes
Type B:
Soft PE pipes with easy-sliding inner coating made of PEHD (approx. 0.3 mm)
Electric wire:
Radox-Ceander power cable GKT / XKT 3x50 / 50 mm² wires networked
Total length:
500 m each approx. 280 m straight, 220 m with a slight curvature

The cables were drawn in directly from the reel using a tractor with direct logging of the pull-in length and pull-in force.

Der Einzug erfolgte bei beiden Rohrsträngen ohne Fettung. Die Resultate sind in der Tabelle unten protokolliert. Kabellänge m Typ A kg Typ B kg Vergleich Typ A kg - Typ B % 50 91 91 0 0 100 156 91 - 65 58 150 208 117 - 91 56 200 273 156 - 117 57 250 325 182 - 143 56 300 390 221 - 169 57 350 455 273 - 182 60 400 507 299 - 208 59 450 585 351 - 234 60 500 676 377 - 299 56 Both pipes were pulled in without greasing. The results are recorded in the table below. Cable length m Type A kg Type B kg comparison Type A kg - Type B% 50 91 91 0 0 100 156 91 - 65 58 150 208 117 - 91 56 200 273 156 - 117 57 250 325 182 - 143 56 300 390 221 - 169 57 350 455 273 - 182 60 400 507 299 - 208 59 450 585 351 - 234 60 500 676 377 - 299 56

Wie aus der Tabelle ersichtlich ist, wurden die Einzugskräfte bei den erfindungsgemässen Rohren des Typs B auf ca. 60 % reduziert.As can be seen from the table, the pull-in forces were reduced to approximately 60% in the case of the type B pipes according to the invention.

Claims (7)

Kunststoffrohr aus Weich-Polyethylen, dadurch gekennzeichnet, dass es innen mindestens teilweise mit Polyethylen hoher Dichte beschichtet ist.Plastic pipe made of soft polyethylene, characterized in that it is at least partially coated on the inside with high-density polyethylene. Kunststoffrohr gemäss Anspruch 1, dadurch gekennzeichnet, dass es mit Polyethylen hoher Dichte beschichtete Führungen aufweist.Plastic pipe according to claim 1, characterized in that it has guides coated with high-density polyethylene. Kunststoffrohr gemäss Anspruch 1 oder 2, dadurch gekennzeichnet, dass es innen vollständig mit Polyethylen hoher Dichte beschichtet ist.Plastic pipe according to claim 1 or 2, characterized in that it is completely coated on the inside with high density polyethylene. Kunststoffrohr gemäss einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass die Polyethylenschicht hoher Dichte eine Dicke von mindestens 0,1 mm aufweist, insbesonders ca. 0,3 mm.Plastic pipe according to one of claims 1-3, characterized in that the high density polyethylene layer has a thickness of at least 0.1 mm, in particular approximately 0.3 mm. Kunststoffrohr gemäss einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass mindestens das Weich-Polyethylen und vorzugsweise auch das Polyethylen hoher Dichte ein Recycling-Produkt ist.Plastic pipe according to one of claims 1 to 4, characterized in that at least the soft polyethylene and preferably also the high density polyethylene is a recycling product. Verfahren zur Herstlelung eines Kunststoffrohres gemäss einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass dieses mittels Co-Extrusion hergestellt wird.Process for the production of a plastic pipe according to one of claims 1 to 4, characterized in that it is produced by means of co-extrusion. Verwendung des Kunststoffrohres nach einem der Ansprüche 1 bis 5 als Kabelschutzrohr.Use of the plastic tube according to one of claims 1 to 5 as a cable protection tube.
EP95102935A 1994-03-15 1995-03-02 Wire protection tube Expired - Lifetime EP0674324B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH779/94 1994-03-15
CH77994 1994-03-15

Publications (2)

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EP0674324A1 true EP0674324A1 (en) 1995-09-27
EP0674324B1 EP0674324B1 (en) 1998-12-16

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ID=4194993

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EP95102935A Expired - Lifetime EP0674324B1 (en) 1994-03-15 1995-03-02 Wire protection tube

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EP (1) EP0674324B1 (en)
AT (1) ATE174718T1 (en)
DE (1) DE59504527D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996022873A1 (en) * 1995-01-27 1996-08-01 Technology Licensing Company Hot melt fluidized cladding of innerduct liner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580987A (en) * 1968-03-26 1971-05-25 Pirelli Electric cable
DE2641166A1 (en) * 1975-09-19 1977-03-31 Cables De Lyon Geoffroy Delore COVERED FIBER OPTIC
FR2325062A1 (en) * 1975-09-19 1977-04-15 Cables De Lyon Geoffroy Delore CENTRAL CORE FOR THE ASSEMBLY OF OPTICAL FIBERS INTO A BEAM
EP0313066A2 (en) * 1987-10-23 1989-04-26 W.R. Grace & Co.-Conn. Antistatic/conductive container
EP0365152A1 (en) * 1988-10-17 1990-04-25 PIRELLI GENERAL plc Power Cable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580987A (en) * 1968-03-26 1971-05-25 Pirelli Electric cable
DE2641166A1 (en) * 1975-09-19 1977-03-31 Cables De Lyon Geoffroy Delore COVERED FIBER OPTIC
FR2325062A1 (en) * 1975-09-19 1977-04-15 Cables De Lyon Geoffroy Delore CENTRAL CORE FOR THE ASSEMBLY OF OPTICAL FIBERS INTO A BEAM
EP0313066A2 (en) * 1987-10-23 1989-04-26 W.R. Grace & Co.-Conn. Antistatic/conductive container
EP0365152A1 (en) * 1988-10-17 1990-04-25 PIRELLI GENERAL plc Power Cable

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GENCA CROSSHEAD SPECIFICATIONS COM/TECH (4718) MAI 1988 Rohrkopfes zur Herstellung mehrschichtiger Rohr.
INFORMATIONSBLATT 'Kabelschutzrohre aussen weiss' MEURY (Fabrikation von Kunststoffrohre)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996022873A1 (en) * 1995-01-27 1996-08-01 Technology Licensing Company Hot melt fluidized cladding of innerduct liner

Also Published As

Publication number Publication date
EP0674324B1 (en) 1998-12-16
ATE174718T1 (en) 1999-01-15
DE59504527D1 (en) 1999-01-28

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