EP0674324B1 - Wire protection tube - Google Patents

Wire protection tube Download PDF

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Publication number
EP0674324B1
EP0674324B1 EP95102935A EP95102935A EP0674324B1 EP 0674324 B1 EP0674324 B1 EP 0674324B1 EP 95102935 A EP95102935 A EP 95102935A EP 95102935 A EP95102935 A EP 95102935A EP 0674324 B1 EP0674324 B1 EP 0674324B1
Authority
EP
European Patent Office
Prior art keywords
tube
soft
plastic tube
pehd
polyethylene
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.)
Expired - Lifetime
Application number
EP95102935A
Other languages
German (de)
French (fr)
Other versions
EP0674324A1 (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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Filing date
Publication date
Application filed by Jansen AG filed Critical Jansen AG
Publication of EP0674324A1 publication Critical patent/EP0674324A1/en
Application granted granted Critical
Publication of EP0674324B1 publication Critical patent/EP0674324B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 tubes made of soft polyethylene (Soft PE), when pulling the cable have reduced friction.
  • 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 is generally understood to mean PE qualities with a density of equal to or greater than approximately 0.930 g / cm 3 (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.
  • EP-A-0 359 128 describes one piece a thermoplastic molding compound extruded plastic tube, especially a cable protection tube, in which the Lubricant is worked 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 especially suitable for hard polyethylene (PEHD).
  • This incorporation does cause environmental problems by directly exiting part of the lubricant at the end of the pipe after pulling in the cable and one achieved homogeneous distribution of the same, but contains the entire molding compound contains a foreign substance that affects the material properties influenced and also interfere with recycling can.
  • cable protection tubes are 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 now to to provide easy-sliding plastic pipes made of soft PE, especially for use as cable protection tubes, and a process for their production.
  • the plastic pipes according to the present invention are at least coated with PEHD 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 Pipe wall.
  • the PEHD coating 1 must have such a minimum thickness have that the gliding ability guarantees is. Adequate gliding will already be achieved with PEHD layer thicknesses of approx. 0.1 mm, one regular application of such low layer thicknesses high apparatus and process engineering requirements. It is therefore usually more economical to use thicker layers to choose.
  • the maximum thickness is not critical. However, it is used for cost reasons and to maintain the Pipe flexibility kept as low as possible.
  • Pipes are made from recycled polyethylene can be. As a result of exclusive use The pipes can also be made of polyethylene can be easily recycled again.
  • Such pipes consisting of an inner layer 1 and an outer layer resp. an outer tube 2, are preferably in the co-extrusion process produced in a conventional extruder.
  • the outer tube 2 is moved in the main extruder.
  • the inner layer 1 is over a side extruder transported through the pipe tool and through distribution channels applied as an inner layer.
  • Example Comparison of a conventional soft PE pipe with a pipe coated according to the invention.
  • the cables were directly from the reel a tractor with direct logging of the draw-in length and retracted.

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 tubes made of soft polyethylene (Soft PE), when pulling the cable have reduced friction.

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. For the purposes of this invention, PEHD is generally understood to mean PE qualities with a density of equal to or greater than approximately 0.930 g / cm 3 (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 surface contact through internal profiling, this 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 using conventional lubricants finished pipe is the homogeneous distribution, resp. the exit into the environment, a problem and - due to the presence an additional component - becomes the danger from undesirable material influences increased.

EP-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.EP-A-0 359 128 describes one piece a thermoplastic molding compound extruded plastic tube, especially a cable protection tube, in which the Lubricant is worked 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 especially 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 does cause environmental problems by directly exiting part of the lubricant at the end of the pipe after pulling in the cable and one achieved homogeneous distribution of the same, but contains the entire molding compound contains a foreign substance that affects the material properties influenced and also interfere with recycling can.

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 are 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 now to to provide easy-sliding plastic pipes made of soft PE, especially for use as cable protection tubes, and a process 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 of cable protection tubes made of soft PE with easy sliding Internal coating, especially made of PEHD. The plastic pipes according to the present invention are at least coated with PEHD 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 Pipe 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 such a minimum thickness have that the gliding ability guarantees is. Adequate gliding will already be achieved with PEHD layer thicknesses of approx. 0.1 mm, one regular application of such low layer thicknesses high apparatus and process engineering requirements. It is therefore usually more economical to use thicker layers to choose. The maximum thickness is not critical. However, it is used for cost reasons and to maintain the Pipe flexibility kept as low as possible.

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

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 showed PEHD coated soft PE pipes reduce the Pull-in forces by approx. 40%, which opens up the possibility to overcome longer feed 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 invention Pipes is that they are made from recycled polyethylene can be. As a result of exclusive use The pipes can also be made of polyethylene can be easily recycled again.

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 resp. an outer tube 2, are preferably in the co-extrusion process produced in 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 over a side extruder transported through the pipe tool and through distribution channels applied as an inner layer.

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:Type A:
herkömmliche Weich-PE-Rohreconventional soft PE pipes
Typ B:Type B:
Weich-PE-Rohre mit gleitfreudiger Innenbeschichtung aus PEHD (ca. 0,3 mm)Soft PE pipes with easy-sliding inner coating made of PEHD (approx. 0.3 mm)
Kabel:Electric wire:
Radox-Ceander-Netzkabel GKT/ XKT 3x50/50 mm2 Adern vernetztRadox-Ceander power cord GKT / XKT 3x50 / 50 mm 2 wires networked
Verlegte Gesamtlänge:Total length:
je 500 m ca. 280 m gerade, 220 m mit leichter Krümmung500 m each approx. 280 m straight, 220 m with slight curvature

Die Kabel wurden direkt ab Haspel mittels einer Zugmaschine mit direkter Protokollierung der Einziehlänge und der Einziehkraft eingezogen.The cables were directly from the reel a tractor with direct logging of the draw-in length and retracted.

Der Einzug erfolgte bei beiden Rohrsträngen ohne Fettung. Die Resultate sind in der Tabelle unten protokolliert. Kabellänge Typ A Typ B Vergleich Typ A Typ B m kg kg kg % 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 Type A Type B comparison Type A Type B m kg kg kg % 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 in the tubes of the invention Type B reduced to approx. 60%.

Claims (7)

  1. Plastic tube of soft polyethylen, characterized in that it is at least partially coated in the interior with high-density polyethylen.
  2. Plastic tube according to claim 1, characterized in that it has guideways being coated with high-density polyethylen.
  3. Plastic tube according to claim 1 or 2, characterized in that it is entirely coated in the interior with high-density polyethylen.
  4. Plastic tube according to one of the claims 1 - 3, characterized in that the high-density polyethylen layer has a thickness of at least 0,1 mm, in particular about 0,3 mm.
  5. Plastic tube according to one of the claims 1 - 4, characterized in that at least the softpolyethylen and preferably also the high-density polyethylen is a recycled product.
  6. Process for the manufacturing of a plastic tube according to one of the claims 1 to 4, characterized in that it is manufacted by co-extrusion.
  7. Use of the plastic tube according to one of the claims 1 to 5 as wire 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)

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

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ID=4194993

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Application Number Title Priority Date Filing Date
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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5658613A (en) * 1995-01-27 1997-08-19 Technology Licensing Company Hot melt fluidized cladding of innerduct liner

Family Cites Families (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
FR2325062A1 (en) * 1975-09-19 1977-04-15 Cables De Lyon Geoffroy Delore CENTRAL CORE FOR THE ASSEMBLY OF OPTICAL FIBERS INTO A BEAM
FR2326714A1 (en) * 1975-09-19 1977-04-29 Cables De Lyon Geoffroy Delore PROTECTION AND MECHANICAL REINFORCEMENT OF OPTICAL FIBERS
US4848566A (en) * 1987-10-23 1989-07-18 W. R. Grace & Co. Antistatic/conductive container
GB2223877B (en) * 1988-10-17 1993-05-19 Pirelli General Plc Extra-high-voltage power cable

Also Published As

Publication number Publication date
DE59504527D1 (en) 1999-01-28
ATE174718T1 (en) 1999-01-15
EP0674324A1 (en) 1995-09-27

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