WO2015070827A1 - Microducts for optical cables and the method of creating microduct bundles - Google Patents

Microducts for optical cables and the method of creating microduct bundles Download PDF

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Publication number
WO2015070827A1
WO2015070827A1 PCT/CZ2014/000092 CZ2014000092W WO2015070827A1 WO 2015070827 A1 WO2015070827 A1 WO 2015070827A1 CZ 2014000092 W CZ2014000092 W CZ 2014000092W WO 2015070827 A1 WO2015070827 A1 WO 2015070827A1
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WO
WIPO (PCT)
Prior art keywords
microducts
individual
bundle
sheath
bundles
Prior art date
Application number
PCT/CZ2014/000092
Other languages
French (fr)
Inventor
Ludvik SANDA
Original Assignee
Mateiciuc A.S.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mateiciuc A.S. filed Critical Mateiciuc A.S.
Publication of WO2015070827A1 publication Critical patent/WO2015070827A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres

Definitions

  • the invention concerns microducts for optical cables in the form of flexible bundles enclosed by a shared sheath containing multiple separate sections surrounding individual microducts. This invention also concerns manufacture of this sheath.
  • This bundle of ducts is made up of a specific number of plastic ducts placed in parallel along each other and the individual ducts in the bundle being connected using a fastener.
  • the fastener used is a flexible band, running longitudinally, which is connected practically tangentially to the exterior perimeter points of individual neighbouring ducts, so that the individual ducts in the bundle are at a mutually defined distance if the bands are extended. This measure further increases the flexibility of the enclosed bundle of ducts, making it more resistant to the friction occurring when it is inserted in a protector, thereby allowing a lower.
  • the bundle of ducts can also be created using a multipurpose machine for extruding a sheath, which is used to make sheaths for the relevant bundles and also makes the connecting clip as one item. This method avoids the additional work operations of welding clip protrusions.
  • the bundle of ducts or microducts according to the Czech invention application PV 2008-22, created using individual ducts or microducts joined by a sheath, is a similar solution.
  • the sheath joining the bundle is created from the jackets of the individual ducts or microducts, during which time these jackets are joined into one whole using connecting bridges.
  • These connecting bridges are connected to the jackets of individual ducts or microducts tangentially so that the bundle is oriented on a plane in its original shape.
  • the connecting bridges are flexible and each of the individual ducts or microducts is loose within its jacket in the connecting sheath.
  • Microducts for optical cables in the form of a flexible bundle enclosed in a shared sheath which consists of multiple separate sections encasing the individual microducts, contributes towards removing the abovementioned deficiencies.
  • the basis of the invention consists of the fact that the multiple microduct bundle sheath is made from two polymer sheets placed parallel to each other along each side of the bundle, which are connected to each other at connection sites situated between individual sheath sections containing individual bundles, in lines along individual microducts .
  • Advantageous perforations may be made at the connection sites.
  • the method of creating the microduct bundles for optical cables according to this invention consists of using two polymer sheets (Fl, F2) placed parallel to each other along both sides of the microduct bundle and subsequently connecting them at connection sites located between individual sheath sections using permanent connections leading in a line along the individual microducts.
  • the permanent connections in the shared sheath, leading in lines along the perimeter microducts of each individual bundle, are useful heat welds or glued connections.
  • Perforations can be made at the connection sites to increase bundle flexibility.
  • the structural design of the sheath according to this invention, and the method of its manufacture, does not use an extrusion process to make jackets for individual ducts and does not require a specific extrusion tool for each bundle composition - given by the number and dimensions of individual microducts.
  • the reduced energy required for manufacture of bundles of microducts, due to the fact that high-temperature polymer melt like that used for extruded jackets, is not required to create the jacket, is also related to this concept.
  • This method requires minimum energy to create welds/connections in the plastic sheet.
  • This solution is indisputably also an ecological solution from the aspect of its reduced energy requirements.
  • Another advantage of a flexible shared microduct bundle sheath for protection of cables and the methods of creating it, according to the invention, is the reduced material the bundle sheath requires.
  • the thickness of the casing is significantly less than in casings created by extrusion and is up to 0.25 mm thick.
  • microduct bundle sheath solution enables maximum flexibility of the bundle as a whole due to the space (weld/connections) between individual ducts.
  • the integrity of the remainder of the bundle and protection of individual tubes is maintained even after one or several microducts are separated (when branching a bundle). Separation of individual microducts is very simple and does not require any special tools as a result of potential perforation at the site of welding/connection.
  • pic. 2 - a cross-section of a multiple flexible shared sheath for multiple microducts.
  • a flexible shared sheath surrounding a bundle of two microducts of various dimensions for protection of optical cables contains two separate sections enclosing individual microducts J_i and T2.
  • This shared sheath enclosing microducts Tl and T2 is created using two polyolefin based polymer sheets Fl_, F2 situated parallel to each other along both sides of the bundle, which are connected to each other at connection sites Sland S2. situated between individual sheath sections 01_, 02 ⁇ in lines along individual microducts Tl and T2.
  • the method used to create the flexible shared microduct sheath for protection of optical cables consists of two polymer sheets Fl, F2 being placed parallel to each other along both sides of the bundle of microducts Tl and T2 and subsequently connected at connection sites Si, S2 situated between individual sheath sections 01 , 02, using permanent connections leading in lines along individual microducts Tl, T2.
  • the flexible multiple microduct bundle sheath for protecting optical cables contains multiple separate sections enclosing individual microducts J_l , T2 to TX.
  • the multiple microduct bundle sheath Tl, T2 to TX is created using two softened polyvinylchloride based polymer sheets Fl , F2 placed parallel to each other on both sides of the bundles, which are connected to each other at connection sites SI, S2 to SX, situated between individual sheath sections 01, 02 to OX of individual bundles, in lines along individual microducts Tl , T2 to TX.
  • connection sites SI, S2 to SX There are perforations at connection sites SI, S2 to SX.
  • Permanent connections SI, S2 to SX between individual sheath sections 01, 02 to OX are heat welds, or alternatively, glued connections.
  • Perforations are created at connections sites S_l, S2 to SX.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Packages (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

Microducts for optical cables are made in the form of a flexible bundle (see Fig. 2) enclosed by a shared sheath, which contains multiple separate sections enclosing individual microducts (T1, T2, TX) and is created using polymer sheets (F1, F2) placed parallel to each other along both sides of the bundle, which are connected to each other at connection sites (S1, S2 to SX) situated between the individual sheath sections (O1, O2 to OX), in lines along the individual microducts (T1, T2 to TX). Perforations may be created at individual connection sites. The invention also concerns the method used to create the bundle of microducts for optical cables.

Description

MICRODUCTS FOR OPTICAL CABLES AND THE METHOD OF CREATING MICRODUCT BUNDLES
Field of the invention
The invention concerns microducts for optical cables in the form of flexible bundles enclosed by a shared sheath containing multiple separate sections surrounding individual microducts. This invention also concerns manufacture of this sheath.
Background of the invention
At present we only know of bundles of microducts for protecting optical cables, which are created by joining tubes or microducts using bridges. These bridges are firmly connected directly to each microduct. The main disadvantage of this solution is that the perimeters of individual microducts are never absolutely smooth at the site a bridge is potentially removed - removal of the bridges leaves traces on the microduct. This then causes problems when connecting microducts using waterproof connectors, etc. for example. In this design the bridges (for manufacturing reasons) are relatively thick, which makes the microduct bundle more rigid, or less flexible, along its longitudinal axis and consequently makes it more difficult to manipulate.
For these reasons, it seems that joining smooth microducts into bundles by enclosing them in a shared sheath is a more suitable solution from an application point of view. In relation to this design, we know of a multiple bundle of seven microducts situated around a central cable, joined by being enclosed in a shared external sheath in the shape of a heptagon with rounded corners - published patent application USA No 2005224124.
We also know of bundles containing a greater number of microducts placed inside a hexagon shaped external sheath with rounded corners - patent Great Britain No 240893.
We also know of a multipurpose set of microducts under German patent No 33 08 482. The surface sheath used on this bundle of microducts is firmly connected longitudinally at regular specified intervals with the walls of the individual ducts. This means that the individual ducts from the bundle are firmly connected but are held together flexibly so that it is possible to wind bundles of ducts on a reel, as well as making them easy to place in protectors, i.e. into cable conduits. This firm connection of the surface layer at specified sites on the walls of individual ducts can be created using heat and/or adhesion and/or welding. Another flexible bundle of ducts is known under European patent No 0 235 576. This bundle of ducts is made up of a specific number of plastic ducts placed in parallel along each other and the individual ducts in the bundle being connected using a fastener. The fastener used is a flexible band, running longitudinally, which is connected practically tangentially to the exterior perimeter points of individual neighbouring ducts, so that the individual ducts in the bundle are at a mutually defined distance if the bands are extended. This measure further increases the flexibility of the enclosed bundle of ducts, making it more resistant to the friction occurring when it is inserted in a protector, thereby allowing a lower.
The above-mentioned bundles are easier to manipulate than microducts connected using bridges. On the other hand, due to the fact that the external sheath holds a fairly large number of microducts, if it is necessary to release one or some of these ducts - i.e. for the purpose of branching from the main direction (so-called branching), the bundle falls apart completely and subsequent manipulation is complicated.
From this aspect the solution according to European patent No 0939262, where at least two individual ducts are always joined into individual bundles using a surface layer, and at least two of these bundles of ducts are then connected using a flexible clip into bundles containing multiple ducts, seems to be a somewhat more suitable solution. The surface layer can be applied while hot, by gluing or welding to the specified exterior sites of at least two individual ducts. The surface layer of the duct bundles has always at least one clip protrusion facing outward, which is connected to the clip protrusion of the neighbouring duct bundle using a clip. This connection can be glued or welded. The bundle of ducts can also be created using a multipurpose machine for extruding a sheath, which is used to make sheaths for the relevant bundles and also makes the connecting clip as one item. This method avoids the additional work operations of welding clip protrusions.
The bundle of ducts or microducts according to the Czech invention application PV 2008-22, created using individual ducts or microducts joined by a sheath, is a similar solution. The sheath joining the bundle is created from the jackets of the individual ducts or microducts, during which time these jackets are joined into one whole using connecting bridges. These connecting bridges are connected to the jackets of individual ducts or microducts tangentially so that the bundle is oriented on a plane in its original shape. The connecting bridges are flexible and each of the individual ducts or microducts is loose within its jacket in the connecting sheath.
The abovementioned multiple microduct bundle jackets connected using bridges, are created by extrusion of a melted liquid through an extrusion machine - a jacketing head on the extrusion machine. However, this tool is specific for a specific bundle composition - the number and dimensions of individual microducts. A different composition of bundles requires a different extrusion tool, which results in limited universality and increased costs for manufacture of bundles of microducts with such types of jacket. Furthermore, extrusion itself is a process requiring significant energy and the necessary sizing of extruded bridges (from the aspect of strength) results in unnecessary costs for material and frequently also excessively increases the rigidity of the bundles as a whole.
Summary of the invention
Microducts for optical cables in the form of a flexible bundle enclosed in a shared sheath, which consists of multiple separate sections encasing the individual microducts, contributes towards removing the abovementioned deficiencies. The basis of the invention consists of the fact that the multiple microduct bundle sheath is made from two polymer sheets placed parallel to each other along each side of the bundle, which are connected to each other at connection sites situated between individual sheath sections containing individual bundles, in lines along individual microducts .
Advantageous perforations may be made at the connection sites.
The method of creating the microduct bundles for optical cables according to this invention consists of using two polymer sheets (Fl, F2) placed parallel to each other along both sides of the microduct bundle and subsequently connecting them at connection sites located between individual sheath sections using permanent connections leading in a line along the individual microducts.
The permanent connections in the shared sheath, leading in lines along the perimeter microducts of each individual bundle, are useful heat welds or glued connections.
Perforations can be made at the connection sites to increase bundle flexibility.
The structural design of the sheath according to this invention, and the method of its manufacture, does not use an extrusion process to make jackets for individual ducts and does not require a specific extrusion tool for each bundle composition - given by the number and dimensions of individual microducts. On the contrary, this concerns a variable solution with the option of combining various numbers and various dimensions of individual microducts. It consists of creating welds (or glued connections) on an unwound plastic sheet between individual microducts, which are variably guided under the unwound sheet of the relevant width. The reduced energy required for manufacture of bundles of microducts, due to the fact that high-temperature polymer melt like that used for extruded jackets, is not required to create the jacket, is also related to this concept. This method requires minimum energy to create welds/connections in the plastic sheet. This solution is indisputably also an ecological solution from the aspect of its reduced energy requirements.
Another advantage of a flexible shared microduct bundle sheath for protection of cables and the methods of creating it, according to the invention, is the reduced material the bundle sheath requires. With regard to the material used for the shared microduct sheath - particularly sheets made from polyolefin, or softened polyvinylchloride, the thickness of the casing is significantly less than in casings created by extrusion and is up to 0.25 mm thick.
The microduct bundle sheath solution according to this invention enables maximum flexibility of the bundle as a whole due to the space (weld/connections) between individual ducts. With regard to the preferred method of enclosing each individual microduct or a smaller number of microducts, the integrity of the remainder of the bundle and protection of individual tubes is maintained even after one or several microducts are separated (when branching a bundle). Separation of individual microducts is very simple and does not require any special tools as a result of potential perforation at the site of welding/connection.
Brief description of the drawings
The appended plan is intended to clarify the essence of the invention, whereas it represents pic. 1 - a cross-section detail of the shared flexible sheath for two microducts of various diameter,
pic. 2 - a cross-section of a multiple flexible shared sheath for multiple microducts.
Example of realisation of the invention Example 1
A flexible shared sheath surrounding a bundle of two microducts of various dimensions for protection of optical cables (see pic. 1) contains two separate sections enclosing individual microducts J_i and T2. This shared sheath enclosing microducts Tl and T2 is created using two polyolefin based polymer sheets Fl_, F2 situated parallel to each other along both sides of the bundle, which are connected to each other at connection sites Sland S2. situated between individual sheath sections 01_, 02^ in lines along individual microducts Tl and T2. The method used to create the flexible shared microduct sheath for protection of optical cables consists of two polymer sheets Fl, F2 being placed parallel to each other along both sides of the bundle of microducts Tl and T2 and subsequently connected at connection sites Si, S2 situated between individual sheath sections 01 , 02, using permanent connections leading in lines along individual microducts Tl, T2.
Permanent connections SI, S2 between individual sheath sections 01, 02 are heat welds. Example 2
The flexible multiple microduct bundle sheath for protecting optical cables (with four microducts indicated on pic. 2) contains multiple separate sections enclosing individual microducts J_l , T2 to TX. The multiple microduct bundle sheath Tl, T2 to TX is created using two softened polyvinylchloride based polymer sheets Fl , F2 placed parallel to each other on both sides of the bundles, which are connected to each other at connection sites SI, S2 to SX, situated between individual sheath sections 01, 02 to OX of individual bundles, in lines along individual microducts Tl , T2 to TX.
There are perforations at connection sites SI, S2 to SX.
The method used to create the flexible shared microduct bundle sheath for protection of optical cables consists of two polymer sheets FJ_, F2 being placed parallel to each other along both sides of the bundle of microducts Tl, T2, TX, which are subsequently connected to each other at connection sites Sl= S2 to SX situated between individual sheath sections 01, 02 to OX, using permanent connections leading in a line along individual microducts XI, T2 to TX.
Permanent connections SI, S2 to SX between individual sheath sections 01, 02 to OX are heat welds, or alternatively, glued connections.
Perforations are created at connections sites S_l, S2 to SX.

Claims

P A T E N T C L A I M S
1. Microducts for optical cables in the form of a flexible bundle enclosed by a shared sheath, are distinguished by the fact that the multiple sheath enclosing the bundle of microducts (Tl, T2, TX) is created using two polymer sheets (Fl, F2) placed parallel to each other along both sides of the bundle, which are connected to each other at connection sites (SI, S2 to SX), situated between individual sheath sections (01, 02 to OX), in lines along the individual microducts (Tl, T2 to TX).
2. The flexible shared sheath according to claim 1 is distinguished by perforations being created at connection sites (SI, S2 to SX).
3. The method used to create the bundle of microducts for optical cables according to claim 1 , is distinguished by the creation of a flexible shared sheath enclosing a bundle made from two polymer sheets (Fl, F2) placed parallel to each other along both sides of the bundle of microducts (Tl , T2, TX) and subsequently connected at connection sites (SI, S2 to SX), situated between the individual sheath sections (01, 02 to OX), using permanent connections leading in a line along the individual microducts (Tl, TN to TX).
4. The method according to claim 1 is distinguished by perforations being created at connection sites (S 1 , S2 to SX).
5. The method according to claim 1 is distinguished by the permanent connections (SI, S2 to SX) between the individual sheath sections (01, 02 to OX) being heat welds.
6. The method according to claim 1 is distinguished by the permanent connections (SI, S2 to SX) between individual sheath sections (01, 02 to OX) being glued connections.
PCT/CZ2014/000092 2013-11-18 2014-08-29 Microducts for optical cables and the method of creating microduct bundles WO2015070827A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ2013-897A CZ2013897A3 (en) 2013-11-18 2013-11-18 Flexible wrapper for optical cable microtubes and process for producing thereof
CZPV2013-897 2013-11-18

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WO2015070827A1 true WO2015070827A1 (en) 2015-05-21

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Citations (11)

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GB240893A (en) 1924-06-10 1925-10-12 Reginald Charles Boards Improvements in or relating to shop-fixtures, show-cases, filing-cabinets, book-cases, wardrobes, cupboards and the like
DE8213407U1 (en) * 1982-05-08 1982-11-18 Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co Kg, 4352 Herten Cable routing unit
DE3210404A1 (en) * 1982-03-22 1983-09-22 Thyssen Plastik Anger KG, 8000 München Cable duct
DE3217401A1 (en) * 1982-05-08 1983-11-10 Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co Kg, 4352 Herten Cable guidance device
DE3308482A1 (en) 1983-03-10 1984-09-13 Rehau Plastiks Ag + Co, 8673 Rehau METHOD FOR PRODUCING A TUBE COMPOSITE
EP0235576A2 (en) 1986-03-01 1987-09-09 REHAU AG + Co Flexible closed tube assembly
EP0939262A2 (en) 1998-02-25 1999-09-01 REHAU AG + Co Composite hose
DE29910196U1 (en) * 1999-06-11 1999-09-16 Gruber Sabine Device for the parallel connection of at least one longitudinal profile and / or at least one line by means of a textile material
EP1284537A1 (en) * 2001-08-17 2003-02-19 Novoplastic Installation assembly comprising a plurality of conduits and process for laying such an assembly
US20050224124A1 (en) 2001-07-11 2005-10-13 Grimsley Tim A Sheathed microduct system
US20070250038A1 (en) * 2006-04-20 2007-10-25 Boston Scientific Scimed, Inc. Multiple lumen assembly for use in endoscopes or other medical devices

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FR2397645A1 (en) * 1977-07-12 1979-02-09 Thomson Brandt BED OF OPTICAL FIBERS IN AN OPTICAL TRANSMISSION CABLE, METHOD FOR MANUFACTURING THE SAID BED AND OPTICAL CABLE CONTAINING A MULTIPLICITY OF SUCH BODIES
US4190319A (en) * 1978-02-13 1980-02-26 Essex Group, Inc. Fiber optic ribbon and cable made therefrom
DE3913674A1 (en) * 1989-04-26 1990-10-31 Rheydt Kabelwerk Ag Flat optical fibre cable - with specified adhesive, carrier foil and cover band
DE4236742A1 (en) * 1992-10-30 1994-05-05 Kabelmetal Electro Gmbh Load pressure measuring appts., e.g. for road surfaces - has optical fibre inside elongated casing made of metal bands stuck together by heat-activated adhesive
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Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB240893A (en) 1924-06-10 1925-10-12 Reginald Charles Boards Improvements in or relating to shop-fixtures, show-cases, filing-cabinets, book-cases, wardrobes, cupboards and the like
DE3210404A1 (en) * 1982-03-22 1983-09-22 Thyssen Plastik Anger KG, 8000 München Cable duct
DE8213407U1 (en) * 1982-05-08 1982-11-18 Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co Kg, 4352 Herten Cable routing unit
DE3217401A1 (en) * 1982-05-08 1983-11-10 Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co Kg, 4352 Herten Cable guidance device
DE3308482A1 (en) 1983-03-10 1984-09-13 Rehau Plastiks Ag + Co, 8673 Rehau METHOD FOR PRODUCING A TUBE COMPOSITE
EP0235576A2 (en) 1986-03-01 1987-09-09 REHAU AG + Co Flexible closed tube assembly
EP0939262A2 (en) 1998-02-25 1999-09-01 REHAU AG + Co Composite hose
DE29910196U1 (en) * 1999-06-11 1999-09-16 Gruber Sabine Device for the parallel connection of at least one longitudinal profile and / or at least one line by means of a textile material
US20050224124A1 (en) 2001-07-11 2005-10-13 Grimsley Tim A Sheathed microduct system
EP1284537A1 (en) * 2001-08-17 2003-02-19 Novoplastic Installation assembly comprising a plurality of conduits and process for laying such an assembly
US20070250038A1 (en) * 2006-04-20 2007-10-25 Boston Scientific Scimed, Inc. Multiple lumen assembly for use in endoscopes or other medical devices

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CZ2013897A3 (en) 2015-01-21

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