JP2009271301A - Tape slot type optical fiber cable, and mid-span branching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily cut a press-winding tape in the close vicinity of a coated optical fiber ribbon without using a cutting tool, thereby further improving workability and reducing work hours. <P>SOLUTION: A press-winding tape is a composite tape comprising a pressing tape part and a fusion tape part integrated with the pressing tape part, and is wound with the tape part inside opposing to a coarse winding member while the fusion tape part outside. When a sheath is applied by high-temperature heat-molding, the fusion tape part and the coarse winding member are fused to form an integrated structure in which the press-winding tape is integrated with the sheath via the fusion tape part and the coarse winding member integrated through an opening in an open structure of the press-winding tape to the sheath. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tape slot type optical fiber cable and an intermediate post branching method for the tape slot type optical fiber cable.

  Many optical fiber cables have been developed as FTTH wiring cables. One of them is an SZ twisted tape slot type optical fiber cable, and this SZ twisted tape slot type optical fiber cable is suitable for a so-called intermediate post-branching operation in which an optical fiber tape core wire is taken out without cutting the cable. Because of its wide adoption. In order to draw the optical fiber to the optical fiber subscriber, this intermediate post-branching operation requires an operation of removing the sheath over several tens of centimeters in the longitudinal direction of the optical fiber cable and taking out the optical fiber core from the optical fiber cable. In the tape slot type optical fiber cable, in order to take out the optical fiber core wire, after the sheath is removed, the press winding and the rough winding are cut using a blade or the like.

  Non-Patent Document 1 discloses an intermediate post-branching operation that can easily cut a presser winding and a coarse winding near the optical fiber core without using a blade, and an SZ twisted tape slot type optical cable for performing this operation. The structure of is described.

  Patent Document 1 describes an intermediate post-branching method that is considered so that the lowering work can be easily performed.

  Patent Document 2 describes that a perforated cutout is provided in the outer skin.

January 2008 SEI Technical Review No. 172, pages 144-147 Japanese Patent Laid-Open No. 2003-21728 Japanese Utility Model Publication No. 5-29010

  In non-patent literature, for rough winding, a low melting point material is used, and for presser winding, a gap is formed between the presser windings to form a winding structure. It is described that cutting with the heat of the sheath at the time, and pressing with a finger, cutting with a finger.

  By adopting such a method and structure, the working time can be shortened by cutting the press winding or the rough winding without using a blade, but the workability is further improved for the spread of FTTH. Therefore, it is required to shorten the work time.

  In view of this point, the present invention is a tape slot type light that can be easily cut without using a blade near the optical fiber ribbon, and can further improve the workability and shorten the working time. An object is to provide a fiber cable and an intermediate post-branching method.

The present invention has a structure in which an optical fiber ribbon is housed in a spacer, an optical fiber core assembly structure in which a coarse winding and a presser winding are wound on the upper side, and a sheath is further provided on the upper side. In the tape slot type optical fiber cable having,
The presser roll is a composite tape of a presser tape part and a fusion tape part integrated with the presser tape part, and has an open structure in which a gap is provided between the presser rolls. When the sheath is coated on the optical fiber core assembly with high temperature thermoforming coating, the fusion tape portion and the coarse winding are A tape which is melted to form an integral structure in which the pressing winding through the fusion tape portion and the rough winding through the gap of the opening structure are integrated. A slot-type optical fiber cable is provided.

The present invention is also characterized in that the rough winding is wound in a horizontal winding with an interval, and the presser winding has an open winding structure larger than the interval and wound in the same direction with a gap of 1 to 10 mm. A tape slot type optical fiber cable is provided.

  The present invention also has an open winding structure in which the rough winding is wound horizontally, the presser winding is wound vertically and a gap of 1 to 10 mm is provided, and another rough winding is provided above the pressing winding. A tape slot type optical fiber cable is provided in which the winding is wound in the same direction as the rough winding.

The present invention has a structure in which an optical fiber cable core is housed in a spacer, an optical fiber core assembly structure in which a rough winding and a presser winding are wound on the upper side, and a sheath is further provided on the upper side. In the intermediate post-branching work method of the tape slot type optical fiber cable having,
The presser winding is formed on a composite tape of a presser tape part and a fusion tape part integrated with the presser tape part, and the presser tape part is arranged on the inner side facing the rough winding, and the fusion tape part is arranged on the outer side. When the sheath is hot-molded on the optical fiber core assembly, the fusion tape portion and the rough winding are melted, and the presser winding and the rough winding are integrated with the sheath. When the sheath is torn, the presser winding and the coarse winding integrated with the sheath are cut, and the three are integrally removed from the tape slot type optical fiber cable. An intermediate post branching method for a tape slot type optical fiber cable is provided.

  The present invention also has an open winding structure in which the rough winding is wound horizontally, the presser winding is wound vertically and a gap of 1 to 10 mm is provided, and another rough winding is provided above the pressing winding. An intermediate post-branching method for a tape slot type optical fiber cable is provided, wherein the winding is wound in the same direction as the rough winding.

  Since the present invention uses the press winding provided with the fusion tape portion as described above, since the coarse winding is integrated with the sheath through the gap between the fusion tape portion and the opening structure, If a part of the sheath is removed during the intermediate post-branching operation, both the presser winding and the coarse winding are removed together, and no special work is required to remove the presser winding and coarse winding. It is easy and can be completed in a short time.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a tape slot type optical fiber cable according to an embodiment of the present invention, in which a sheath is partially removed for intermediate post-branching work, and FIG. FIG.

  1 and 2, a tape slot type optical fiber cable 100 is formed with a slot (slot groove) 2 in a slot, for example, a spacer 1 with an SZ twisted groove, and an optical fiber tape core wire 3 is disposed in the slot 2. That is, housed. The slot 2, called SZ, is formed so that the slot grooves advance in the axial direction while alternately reversing, and is characterized by excellent operability when performing an intermediate rear branch of an optical fiber cable. have. When the optical fiber tape core wire 3 is accommodated in the slot 2, the coarse winding 4 is wound at regular intervals to prevent the optical fiber tape core wire 3 from coming out of the slot 2. A presser winding 5 is wound on the upper side of the rough winding 4. In the case of this example, the winding direction of the rough winding 4 and the winding direction of the presser winding 5 are the same direction, but they may be opposite. Reference numeral 19 denotes a tension member.

  Thus, the optical fiber core wire 3 is accommodated in the spacer 1 with the SZ twist groove, and the optical fiber core wire aggregate structure 50 in which the rough winding 4 and the presser winding 5 are wound on the upper side is configured. While the optical fiber core assembly 50 is passed through a through hole (not shown), the periphery of the optical fiber assembly 50 is covered with a molten thermoplastic resin, and the sheath 6 is cooled with cooling. Is formed. That is, the sheath is welded, cooled and fixed on the upper side of the optical fiber core assembly 50. A tear string 7 is disposed on the surface of the optical fiber core assembly structure 50, and this tear string 7 is used when the sheath is torn. The sheath 6 may be torn by other methods.

  The presser winding 5 has an open winding structure in which a gap 8 is provided between the presser windings. The gaps (gap) are formed at equal intervals at a predetermined distance, but are 1 to 10 mm as an example. The coarse winding 4 is wound on the spacer 1 at a pitch (interval) 18 that is narrower than the gap 8. In FIG. 1, an example of 1 to 5 mm is shown. However, it shall be smaller than the above-mentioned 1-10 mm.

  The presser winding 5 is composed of a composite tape as shown in FIG. As the composite tape, an integrated structure in which an upper fusion tape portion (thermoplastic material tape portion) 51 and a lower ordinary press-wound tape portion 52 are bonded is used. Therefore, the presser winding 5 is a presser winding having a composite tape configuration. Hereinafter, when referred to as “holding winding”, it refers to pressing winding of this composite tape configuration.

  The sheath 6, the rough winding 4 and the fusion tape part 51 are made of a thermoplastic material. Examples of the thermoplastic resin include high density polyethylene, medium density polyethylene, low density polyethylene, polyester, polyamide, polypropylene, polyethylene terephthalate, nylon, and combinations of these various materials. A high melting point thermoplastic resin is selected for the sheath 6, and a low melting point thermoplastic material is selected for the fusion tape part 51. High density polyethylene is preferably selected for the sheath 6, and low density polyethylene is preferably selected for the rough winding.

  When extruding and covering a sheath material that has been heated to a high-temperature molten state, which is a general sheath coating method, the coarse winding 4 and the fusion tape portion 51 are melted or semi-molten (hereinafter referred to as “the melted state”). In the case of melting, this semi-molten state is included.), And the sheath 6, the rough winding 4 and the fusion tape portion 51 can be bonded without providing a special process.

  Accordingly, the presser winding 5 is a composite tape of the presser winding tape portion 52 and the fusion tape portion 51 integrated with the presser winding tape portion 52 and has an open structure in which a gap is provided between the presser windings. When the tape portion 52 is wound inwardly facing the coarse winding 5 and the fusion tape portion 51 is disposed on the outer side, and the sheath is coated on the optical fiber core assembly 50 by high temperature thermoforming, the fusion is performed. The tape portion 51 and the coarse winding 52 are melted to form an integral structure in which the coarse winding 4 is integrated with the sheath via the holding tape 5 via the fusion tape portion 51 and the gap 8 of the opening structure 10. Will be formed. In this case, the press-wound tape portion 52 is not fused to the optical fiber beam, and thus does not cause any trouble.

  Accordingly, when a part of the sheath 6 is torn in the longitudinal direction, the coarse winding 4 and the presser winding 5 can be separated and removed without using a blade.

  FIG. 4 shows a diagram in which the coarse winding 4 and the presser winding 5 are separated from the tape slot type optical fiber cable together with a part of the sheath 6 and removed.

FIG. 5 shows a flowchart.
In FIG. 5, an optical fiber core wire is accommodated in a spacer (S1), and a rough winding made of a thermoplastic material is wound on the upper side (S2). Further, a presser winding is wound on the upper side. The presser roll is composed of a composite tape consisting of a fusion tape part that is integral with the sheath and a presser tape part as a presser winding function, with the fusion tape part on the outside and the presser tape part on the inside. Then, an open structure is formed in which a gap is provided between the press windings, and winding is performed (S4). An optical fiber core assembly is formed. Then, a sheath material made of thermoplastic material is extruded to cover the upper side of the optical fiber core assembly (S5). At this time, the thermoplastic material tape portion of the coarse winding and the composite tape is melted and united. As a result, the coarse winding and the presser winding are integrated into the sheath (three-party integration) (S6). In this way, a tape slot type optical fiber is configured.

  During the intermediate branching operation, a part of the sheath is cut and removed. At this time, since the sheath, the coarse winding and the presser winding are integrated, the coarse winding and the presser winding are also separated and removed together with the removal of the sheath (S7).

  Next, the optical fiber core wire is branched (S8), and the intermediate post branching operation is terminated (S9).

  Accordingly, the rough winding and the press winding can be removed from the tape slot type optical fiber cable in a short time by an easy working method, and the optical fiber ribbon 3 can be easily branched. The example shown in FIG. 1 is an example in which the presser winding 5 is horizontally wound, but the present invention can also be employed in an example in which the presser winding 5 is vertically wound. FIG. 6 shows an example in which the presser winding 5 is vertically wound. The same number is attached | subjected to the structure same as FIG. 1, and description of FIG. 1, FIG. 2 is used. In addition, since a cross-sectional view is the same as FIG. 2, it is not illustrated.

  In the example shown in FIG. 6, a gap 8 is formed in the longitudinal direction of the tape slot type optical fiber cable, the gap is 1 to 5 mm, and the pitch width is 1 to 10 mm. In this example, another coarse winding 21 is wound on the upper side of the presser winding 5 in order to press the presser winding 5.

  Even in this example, the presser winding 5 is a composite tape 52 of a presser tape part and a fusion tape part 51 integrated with the presser tape part, and has an open structure in which a gap is provided between the presser rolls. When the pressing tape portion 52 is wound inwardly toward the rough winding 5 and the fusion tape portion 51 is disposed on the outer side, and the sheath is coated on the optical fiber core assembly 50 by high temperature thermoforming, The fusion tape portion 51 and the coarse winding 52 are melted, and the presser winding 5 via the fusion tape portion 51 and the coarse winding 4 via the gap 8 of the opening structure 10 are integrated with the sheath. A static structure will be formed.

  Accordingly, when a part of the sheath 6 is torn in the longitudinal direction, the coarse winding 4 and the presser winding 5 can be separated and removed without using a blade.

The figure which shows the structure of the Example of this invention. FIG. 2 is a cross-sectional view of the sheath of FIG. 1. The figure which shows the compound state of presser winding. The figure which removed the sheath, the rough winding, and the presser winding. FIG. The figure which shows the structure of the other Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Spacer (spacer with SZ twist groove), 2 ... Slot, 3 ... Optical fiber ribbon, 4 ... Coarse winding, 5 ... Holding winding, 6 ... Sheath, 7 ... Tear string, 8 ... Gap, 21 ... Others 50 ... optical fiber core assembly structure, 51 ... fusion tape portion, 52 ... press-wound tape portion, 100 ... tape slot type optical fiber cable.

Claims (5)

A tape slot type having a structure in which an optical fiber ribbon is housed in a spacer, an optical fiber core assembly structure in which a rough winding and a presser winding are wound on the upper side, and a sheath is provided on the upper side In optical fiber cable,
The presser roll is a composite tape of a presser tape part and a fusion tape part integrated with the presser tape part, and has an open structure in which a gap is provided between the presser rolls. When the sheath is coated on the optical fiber core assembly with high temperature thermoforming coating, the fusion tape portion and the coarse winding are A tape which is melted to form an integral structure in which the pressing winding through the fusion tape portion and the rough winding through the gap of the opening structure are integrated. Slot type optical fiber cable. In Claim 1, the said rough winding is wound with the space | interval in the horizontal winding, and the said holding | suppressing winding has an open winding structure larger than this space | interval and wound in the same direction by 1-10 mm clearance gap. Tape slot type optical fiber cable.   In Claim 1, the said rough winding is wound by a horizontal winding, the said holding | suppressing winding is wound by a vertical winding, and has an open winding structure provided with the clearance gap of 1-10 mm, and another rough winding is carried out above this pressing winding. Is wound in the same direction as the rough winding, and is a tape slot type optical fiber cable. Tape slot type having a structure in which an optical fiber cable core is housed in a spacer, an optical fiber core assembly structure in which a coarse winding and a presser winding are wound on the upper side, and a sheath is further provided on the upper side In the intermediate post-branching work method of optical fiber cable,
The presser winding is formed on a composite tape of a presser tape part and a fusion tape part integrated with the presser tape part, and the presser tape part is arranged on the inner side facing the rough winding, and the fusion tape part is arranged on the outer side. When the sheath is hot-molded on the optical fiber core assembly, the fusion tape portion and the rough winding are melted, and the presser winding and the rough winding are integrated with the sheath. When the sheath is torn, the presser winding and the coarse winding integrated with the sheath are cut, and the three are integrally removed from the tape slot type optical fiber cable. An intermediate post branching method for a tape slot type optical fiber cable, characterized in that   In Claim 4, the said rough winding is wound by a horizontal winding, the said holding | suppressing winding is wound by a vertical winding, and has an open winding structure in which the clearance of 1-10 mm is provided, and another rough winding is carried out above this pressing winding. Is wound in the same direction as the coarse winding, and the intermediate post-branching method for the tape slot type optical fiber cable.

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