JP5516073B2 - Stainless Laminated Sheath Cable with Wave - Google Patents

Description

  The present invention relates to a corrugated stainless steel laminated sheath cable.

  In recent years, cable bite damage from small animals such as moths, crows, and woodpeckers, and insects such as bear zest and cable damage from shotguns have increased. Laminated sheath cables (high-strength (HS) sheath cables) are mainly used.

  In the corrugated stainless steel laminated sheathed cable 71 shown in FIG. 7 (a), a plurality of insulated core wires 6 in which the outer periphery of the conductor 6a is covered with an insulator 6b are twisted together (seven in FIG. 7 (a)). The ends of the corrugated stainless steel laminate tape 2 with the adhesive layer are vertically attached to the outer periphery of the cable core 1 integrated with the inner sheath 7 formed by horizontally winding with a plastic tape (polyethylene tape or the like). The outer periphery is covered with the outer sheath 5.

  The corrugated stainless steel laminate sheath cable 72 shown in FIG. 7 (b) has the end portions of the corrugated stainless steel laminate tape 2 bonded to each other at the tape overlapping portion 4 via the adhesive reinforcing resin 8 for reinforcing the adhesive strength. The other configurations are the same as those of the corrugated stainless steel laminated sheath cable 71 shown in FIG.

  In these conventional corrugated stainless steel laminated sheathed cables, the cable core 1 and corrugated stainless steel laminated tape 2 are supplied to a circular die, and are vertically attached to the outer periphery of the cable core 1 in a cylindrical shape. The outer sheath 5 is manufactured by extrusion coating.

JP-A-5-74230

  Since the corrugated stainless steel laminated sheathed cable is handled in the same manner as a general cable, stress such as excessive twisting may be applied in cable laying work or the like.

  However, since the conventional corrugated stainless steel laminated sheathed cable is a cable core in which a plurality of insulated core wires are twisted together, the cross-sectional shape of the cable core is not completely circular even when covered with an inner sheath. However, uneven portions are formed along the circumferential direction, and uneven portions are also formed along the cable longitudinal direction.

  For this reason, when supplying the cable core and the corrugated stainless steel laminate tape to the tape longitudinal attachment device, a portion where the distance between the cable core and the corrugated stainless steel laminate tape is large is generated.

  In locations where the distance is large as described above, the corrugated stainless steel laminate tape does not fully contact the cable core when the corrugated stainless steel laminate tape is pressed into a cylindrical shape by a circular die in the tape vertical molding device. Therefore, sufficient pressing force cannot be obtained. For this reason, the adhesive strength tends to be weak at locations where the distance is large as described above.

  Therefore, in the conventional corrugated stainless steel laminated sheath cable, the adhesive of the tape overlapping portion 4 of the corrugated stainless steel laminate tape 2 is peeled off due to stress during the laying operation, and the edge of the corrugated stainless steel laminate tape 2 is peeled off at this peeled portion. However, the outer sheath 5 is cut and the outer sheath is cracked, and the cable laying operation must be carefully performed to prevent the outer sheath cracking, and the efficiency of the laying operation is low. There's a problem.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a corrugated stainless steel laminated sheath cable in which cracking of the outer sheath is reduced by solving the above problems and improving the adhesive strength of the tape overlapping portion.

  The present invention was devised to achieve the above-mentioned object, and a cable core formed by twisting a plurality of insulating cores composed of a conductor and an insulator covering the conductor, and covering the outer periphery of the cable core In a corrugated stainless steel laminate sheath cable having a corrugated stainless steel laminate tape with an adhesive layer and an outer sheath for covering the outer periphery of the corrugated stainless steel laminate tape, along the longitudinal direction of the cable core An adhesion auxiliary member is provided on the cable core, and a tape overlapping portion formed by overlapping ends of the corrugated stainless steel laminate tape is provided so as to overlap the adhesion auxiliary member. .

  The adhesion auxiliary member is preferably made of rubber, plastic, or paper.

  The adhesion auxiliary member is preferably made of rubber or plastic having a hardness (Shore A) of A10 to A80.

  The adhesion auxiliary member preferably has a thickness of 0.3 to 2 mm and a width of 3 to 20 mm.

  According to the present invention, it is possible to provide a corrugated stainless steel laminated sheath cable in which cracking of the outer sheath is reduced by improving the adhesive strength of the tape overlapping portion.

It is a cross-sectional view of a corrugated stainless steel laminated sheath cable according to an embodiment of the present invention. 1 is a longitudinal sectional view of a corrugated stainless steel laminated sheath cable according to an embodiment of the present invention. It is a cross-sectional view of a corrugated stainless steel laminated sheath cable according to another embodiment of the present invention. It is a figure for demonstrating the bending test method. It is a figure for demonstrating the twist test method. It is a figure for demonstrating the tension test method. It is a cross-sectional view of a conventional corrugated stainless steel laminated sheath cable.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of a corrugated stainless steel laminated sheath cable according to the present embodiment.

  A cable core 1 shown in FIG. 1 is provided with a plurality of insulation core wires 6 (seven in FIG. 1) in which the outer periphery of a conductor 6a made of copper or the like is covered with an insulator 6b made of polyethylene, and these are twisted. The combined ones are integrated with an inner sheath 7 that is horizontally wound with polyethylene tape.

  Although the details of the adhesion assisting member 3 will be described later, it is a member for improving the adhesion strength by assisting adhesion when the end portions of the corrugated stainless steel laminate tape 2 are overlapped and adhered.

  The adhesion auxiliary member 3 is linearly arranged on the outer peripheral surface of the cable core 1 along the longitudinal direction of the cable core 1 (the direction perpendicular to the paper surface in FIG. 1).

  The corrugated stainless steel laminate tape 2 is obtained by providing a heat-sealable adhesive layer on at least one surface of a flat stainless steel tape and subjecting it to corrugation.

  The corrugated stainless steel laminate tape 2 is vertically attached to the cable core 1 so that the adhesive layer is positioned on the outer peripheral side and the ends of the corrugated stainless steel laminate tape 2 overlap each other. At this time, the tape overlapping portion 4 is disposed so as to overlap the adhesion assisting member 3.

  After the arrangement, the heat-fusible adhesive layer is heated and the ends of the corrugated stainless steel laminate tape 2 are bonded to each other.

  Finally, the corrugated stainless steel laminate tape 2 is covered with an outer sheath 5 made of polyethylene, and the corrugated stainless steel laminate sheath cable 10 is manufactured.

  The effects of the adhesion assisting member 3 in the corrugated stainless steel laminated sheath cable 10 will be further described with reference to FIG.

  2 is a longitudinal sectional view taken along line AA in FIG.

  As shown in FIG. 2A, the cable core 1 and the corrugated stainless steel laminate tape 2 are positioned so that the tape overlapping portion 4 overlaps the adhesion assisting member 3, and the adhesion assisting member 3 is the cable core 1. In a state of being provided so as to straddle the recessed portion 1a on the outer peripheral surface (circumferential direction and longitudinal direction), these are supplied to a tape vertical attachment device disclosed in, for example, Japanese Patent Application Laid-Open No. 57-83437. Then, the corrugated stainless steel laminate tape 2 is formed in a cylindrical shape on the outer periphery of the cable core 1 and vertically attached to the cable core 1, and then the ends of the corrugated stainless steel laminate tape 2 are heated by a heating device. Bonded by the heat-fusible adhesive, the state shown in FIG.

  The corrugated stainless steel laminate tape 2 is pressed toward the center of the cable core 1 when the corrugated stainless steel laminate tape 2 is formed into a cylindrical shape by a circular die provided in the tape vertical attachment device.

  Even when the distance between the cable core 1 and the corrugated stainless steel laminate tape 2 is large (indented portion 1a), the bottom 2a of the corrugated stainless steel laminate tape 2 is in sufficient contact with the adhesion assisting member 3 when the circular die is pressed. Thus, the adhesion is assisted, and the adhesive strength of the heat-fusible adhesive layer is increased also in the recess 1a.

  Furthermore, the bottom part 2a of the corrugated stainless steel laminate tape 2 dents the contact part 3a with the adhesion assisting member 3, so that the non-contact part 3b protrudes relative to the contact part 3a. Since the protruding portion (non-contact portion 3b) also presses the inclined surface 2b of the corrugated stainless steel laminate tape 2, the adhesion is assisted, and the adhesive strength of the heat-fusible adhesive layer is strong also on the inclined surface 2b. Become.

  As a result, the adhesive strength of the tape overlap portion 4 is increased over the entire length of the cable and is difficult to peel off. Therefore, it is possible to effectively prevent the outer sheath from cracking even if the cable is subjected to stress such as twisting. become able to.

  Therefore, the adhesion assisting member 3 has an appropriate hardness because the contact portion 3a straddles the recessed portion 1a, the contact portion 3a is recessed by an external force from the die, and the non-contact portion 3b presses the inclined surface 2b. preferable.

  For this reason, the material of the adhesion assisting member 3 is preferably rubber, plastic (resin), paper, or the like, and more preferably rubber or plastic having a hardness of A10 to A80 (Shore A). Further, as the rubber or plastic, a foamed or embossed product can be used.

  Further, as the shape of the adhesion assisting member 3, any shape such as a tape shape, a cylindrical shape and a round string shape can be used without departing from the gist of the present invention.

  Furthermore, the thickness (radial direction) of the adhesion auxiliary member 3 is preferably 0.3 to 2.0 mm. This can be wound without forming a large gap between the cable core 1 and the corrugated stainless steel laminate tape 2 even when the adhesion assisting member 3 is inserted. This is because the mechanical strength is not substantially changed and the adhesive strength of the tape overlapping portion 4 can be improved.

  The width (circumferential direction) of the adhesion assisting member 3 is preferably 3.0 to 20 mm. This is because the tape overlapping portion 4 can be easily arranged so as to overlap the adhesion assisting member 3, so that the adhesive strength of the tape overlapping portion 4 can be improved, and the corrugated stainless steel laminated sheath cable This is because the outer diameter and mechanical strength are almost unchanged.

  Next, examples of the present invention will be described. In this example, mechanical characteristics were evaluated using the corrugated stainless steel laminated sheathed cable shown in Examples 1 and 2 and Comparative Example 1 below.

Example 1
A corrugated stainless steel laminated sheath cable having the structure shown in FIG.

  The outer diameter of the cable core 1 is 24.5 mm, the outermost diameter of the corrugated stainless steel laminate tape 2 is 26.5 mm, the innermost diameter is 25 mm, the width (circumferential direction) of the tape overlapping portion 4 is 10 mm, The thickness (diameter direction) is 0.45 mm, the width (circumferential direction) is 15 mm, and the outer diameter of the outer sheath 5 (the outer diameter of the corrugated stainless steel laminated sheath cable 10) is 30.6 mm.

  Here, the cable core 1 is formed by twisting seven insulation core wires 6 made of polyethylene coated on the outer periphery of a conductor made of copper, and winding and integrating them with a polyethylene tape. As the material No. 3, a tape-like rubber having a hardness (Shore A) A10 was used.

(Example 2)
In Example 2, the auxiliary adhesion member 3 used in Example 1 is changed to a tape-like rubber having a hardness (Shore A) A80.

(Comparative Example 1)
In Comparative Example 1, the adhesion assisting member 3 is deleted from the corrugated stainless steel laminated sheath cable of Example 1, and has a structure shown in FIG.

  That is, the outer diameter of the cable core 1 is 24.5 mm, the outermost diameter of the corrugated stainless steel laminate tape 2 is 26.5 mm, the innermost diameter is 25 mm, the width (circumferential direction) of the tape overlapping portion 4 is 10 mm, and the outer sheath 5 The outer diameter (the outer diameter of the corrugated stainless steel laminated sheath cable 10) is 30.6 mm.

  The mechanical properties were evaluated by a bending test, a twisting test, and a tensile test.

(Bending test method)
As shown in FIG. 4, a bend of ± 180 degrees is applied at a bend radius r 12 times the outer diameter of the corrugated stainless steel laminated sheath cable. First, a +180 degree bend is added in the direction of the arrow (1) in the figure to restore the original, and a -180 degree bend is added in the direction of the arrow (2) in the figure to restore the original. The bending motion of moving in the order of 1) and (2) was performed once.

  After the test, it was visually confirmed whether or not an appearance abnormality occurred in the corrugated stainless steel laminated sheath cable (existence of cracks in the outer sheath 5).

(Torsion test method)
As shown in FIG. 5, one portion of the corrugated stainless steel laminated sheath cable is attached to the non-rotating fixed chuck portion 28, and another portion separated by a twisted portion 29 having a length of 1 m above the rotating chuck portion 27. Install. By rotating the rotary chuck portion 27 in this state, a twist of ± 180 degrees is applied to the twisted portion 29. The rotary chuck unit 27 is moved in the order of arrows (1), (2), (3), and (4) in the figure so that it first rotates +180 degrees and returns to the original position, and rotates -180 degrees and returns to the original position. 1 time and this was done 7 times.

  After the test, it was visually confirmed whether or not an appearance abnormality occurred in the corrugated stainless steel laminated sheath cable (existence of cracks in the outer sheath 5).

(Tensile test method)
As shown in FIG. 6, the corrugated stainless steel laminated sheath cable 10 is wound and three turns are provided so that the inner diameter of the ring becomes 800 mm. Then, the corrugated stainless steel laminated sheath cable 10 becomes substantially linear. The cable was pulled at both ends.

  After the test, it was visually confirmed whether or not an appearance abnormality occurred in the corrugated stainless steel laminated sheath cable (existence of cracks in the outer sheath 5).

(Evaluation results)

  As shown in Table 1, no abnormal appearance occurred in any of the samples in the bending test.

  In the twisting test, the cable of Comparative Example 1 was cracked in the outer sheath 5 due to the peeling of the adhesive at the tape overlapping portion 4 at the time when it was performed 3.5 times.

  However, in the cables of Examples 1 and 2, the adhesive was not peeled off at the tape overlapping portion 4 and the outer sheath 5 was not cracked even when the twist test was performed seven times.

  In the tensile test, in the cable of Comparative Example 1, the outer sheath 5 was cracked due to the peeling of the adhesive at the tape overlapping portion 4.

  However, in the cables of Examples 1 and 2, the adhesive was not peeled off at the tape overlapping portion 4 and the outer sheath 5 was not cracked.

  As described above, the cables of Examples 1 and 2 did not cause any abnormality in appearance by any of the test methods, and the overall evaluation resulted in good (◯).

  As described above, according to the corrugated stainless steel laminated sheathed cable 10 of the present application, the adhesive strength of the tape overlapping portion 4 can be improved, so even if stress is applied to the cable due to twisting, the adhesive is peeled off. Can be effectively prevented, and cracking of the outer sheath 5 can be effectively prevented.

  Moreover, since the crack of the outer sheath 5 can be effectively prevented, the outer sheath 5 is less likely to break during the cable laying operation, and the laying operation can be performed efficiently.

  Furthermore, since the above effect can be obtained only by providing the adhesion assisting member 3, it is not necessary to remodel the cable manufacturing equipment, and the manufacturing equipment can be used as it is.

  In addition, in the said Example, although the adhesion auxiliary member 3 was arrange | positioned linearly and in order to make the tape overlapping part 4 overlap with this adhesion auxiliary member 3, the corrugated stainless steel laminate tape 2 was attached vertically, For example, the corrugated stainless steel laminate tape 2 is also spiral (in parallel with the adhesion assisting member 3) so that the adhesion assisting member 3 is disposed in a spiral shape and the tape overlapping portion 4 overlaps the adhesion assisting member 3. It may be wrapped around.

  Moreover, in the said Example, after providing the adhesion auxiliary member 3 on the cable core 1, the corrugated stainless steel laminating tape 2 was attached vertically, For example, the adhesion auxiliary member 3 was previously attached to the corrugated stainless steel laminating tape 2 side first. Then, the corrugated stainless steel laminate tape 2 may be wound so as to cover the cable core 1 so that the tape overlapping portion 4 overlaps the adhesion assisting member 3.

  Further, as shown in FIG. 3, in the tape overlapping portion 4, an adhesive reinforcing resin 8 for further improving the adhesive strength is interposed between the corrugated stainless steel laminate tape 2, so that the end of the corrugated stainless steel laminate tape 2 is obtained. The parts may be bonded together.

DESCRIPTION OF SYMBOLS 1 Cable core 2 Corrugated stainless steel laminated tape 3 Adhesive auxiliary member 4 Tape overlap part 5 Outer sheath 6 Insulation core wire 6a Conductor 6b Insulator 7 Inner sheath 8 Adhesive reinforcement resin 10, 31, 71, 72 Corrugated stainless steel laminated sheath cable

Claims (3)

A cable core formed by twisting a plurality of insulation core wires made of a conductor and an insulator covering the conductor; a corrugated stainless steel laminate tape with an adhesive layer for covering the outer periphery of the cable core; A corrugated stainless steel laminate sheath cable having an outer sheath for covering an outer periphery of a corrugated stainless steel laminate tape, wherein an adhesion auxiliary member is provided on the cable core along a longitudinal direction of the cable core, and the corrugated stainless steel laminate The tape overlapping portion formed by overlapping the end portions of the tape is provided so as to overlap the adhesion auxiliary member, and the adhesion auxiliary member has a thickness of 0.3 to 2 mm and a width of 3 to 3 mm. A corrugated stainless steel laminated sheath cable characterized by being 20 mm .   The corrugated stainless steel laminated sheath cable according to claim 1, wherein the adhesion auxiliary member is made of rubber, plastic, or paper. The corrugated stainless steel laminated sheath cable according to claim 1, wherein the adhesion assisting member is made of rubber or plastic having a hardness (Shore A) of A10 to A80.

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