JP2012003967A - Flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a halogen-free flat cable which achieves excellent manufacturability and wiring workability.SOLUTION: A flat cable 11 comprises: a plurality of insulated electric cables 12 arrayed in parallel and each including a central conductor 13 covered with an exterior covering 14; and an adhesive tape 16 attached on two opposing sides of the insulated electric cables arrayed in parallel and fixing the cables. The exterior covering 14 is formed from a halogen-free insulative resin composition. The insulative resin composition consists of one of α olefin-based resin and ethylene-based copolymer resin and a mixture thereof. The adhesive tape 16 is formed from a halogen-free resin composition. The resin composition includes, as its main constituent, any of polyester, polyphenylene sulfide and polyimide or a mixture thereof, or copolymer polyester.

Description

  The present invention relates to a flat cable having a plurality of electric wires aligned in parallel.

  As a flat cable having a plurality of electric wires arranged in parallel, a plurality of insulated electric wires with a central conductor covered with an insulating layer mainly composed of a cross-linked polyolefin resin are arranged in parallel. In addition, a material bonded to a resin film including an adhesive layer mainly composed of the same resin as the main component of the resin in the insulating layer is known (see, for example, Patent Document 1).

  As an insulated wire, a conductor is coated with a resin composition obtained by mixing magnesium hydroxide and an organosilicon compound with a copolymer resin of ethylene and an α-olefin having a polar group, and the covering layer is ionized. A non-halogen electric wire irradiated with radiation is known (for example, see Patent Document 2).

JP 2009-117144 A Japanese Patent Laid-Open No. 5-74231

By the way, even in flat cables with parallel insulated wires, due to the necessity of dealing with environmental problems, halogen-based gases that may generate harmful gases such as hydrogen halides or dioxins during fires or incineration treatments. It is required to use insulated wires that do not use materials.
However, insulated wires with a non-halogen jacket have low adhesion to the adhesive, so when multiple insulated wires are bonded to a resin film to form a flat cable, they are insulated from the resin film during winding and transportation. There is a possibility that the electric wires may be peeled off and smooth manufacturing or wiring work cannot be performed.

  An object of the present invention is to provide a flat cable which does not contain halogen and is excellent in manufacturability and wiring workability.

The flat cable of the present invention capable of solving the above problems is a flat cable in which a plurality of electric wires whose conductors are covered with a jacket are arranged in parallel, and the plurality of electric wires are surrounded and fixed by a fixing material,
The jacket is formed of an insulating resin composition that does not contain halogen, and the insulating resin composition is composed of either an α-olefin resin, an ethylene copolymer resin, or a mixture thereof.
The fixing material is formed from a halogen-free resin composition, and the resin composition is mainly composed of polyester, polyphenylene sulfide, polyimide, polyolefin, polyamide, or a mixture thereof, or a copolyester. It is characterized by that.

  In the flat cable of the present invention, the fixing material is an adhesive tape including a base material and an adhesive, and the adhesive is mainly composed of polyester, polyphenylene sulfide, polyimide, a mixture thereof, or a copolyester. It is preferable to have a portion that is attached to both sides of the parallel surface and where the adhesive tapes are bonded to each other.

  In the flat cable of the present invention, it is preferable that the fixing material is a polyolefin-based or polyamide-based hot melt resin and is fixed by fusion around the electric wire.

  According to the flat cable of the present invention, the non-halogen fixing material is surrounded by the non-halogen fixing material with respect to the plurality of the parallel electric wires having the non-halogen (halogen-free) jacket having a low adhesive strength of the adhesive. Since it was fixed by, it can fix an electric wire in a parallel state reliably. That is, it is possible to improve the wiring workability by arranging a plurality of electric wires in parallel while reducing the environmental load as halogen-free.

It is a top view near the edge part of the flat cable which concerns on embodiment of this invention. It is a perspective view of the edge part vicinity of the flat cable which concerns on embodiment of this invention. It is sectional drawing of the fixing location by the fixing material of the flat cable which concerns on embodiment of this invention. It is an expanded sectional view of the fixed location by the fixing material of a flat cable. It is sectional drawing of the flat cable which is an example of other embodiment. It is sectional drawing of the flat cable which is an example of other embodiment.

Hereinafter, an example of an embodiment of a flat cable according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the flat cable 11 according to the present embodiment has a plurality (six in this embodiment) of insulated wires (electric wires) 12.
The flat cable 11 is used, for example, as a power supply panel wiring cable wired in a flat panel display.

As shown in FIGS. 2 and 3, the insulated wire 12 constituting the flat cable 11 is composed of a central conductor (conductor) 13 and a jacket 14 covering the outer periphery thereof, and they are aligned in parallel with each other.
The plurality of insulated wires 12 aligned in parallel with each other are fixed in an aligned state by being sandwiched by adhesive tape (fixing material) 16 from both sides of the parallel surface at a plurality of locations in the longitudinal direction.

  The insulated wire 12 has, for example, a central conductor 13 made of a stranded wire obtained by twisting strands 13a made of tin-plated annealed copper wire. The cable has an outer diameter of 0.92 mm and an AWG 30 outer diameter of about 0.70 mm.

  The jacket 14 covering the center conductor 13 is formed of a non-halogen insulating resin composition that does not contain halogen. This insulating resin composition is composed of either an α-olefin resin, an ethylene copolymer resin, or a mixture thereof. Examples of the α-olefin resin include polyethylene (PE) or polypropylene (PP), and examples of the ethylene copolymer resin include ethylene-vinyl acetate (EVA) and ethylene-ethyl acrylate (EEA). A non-halogen flame retardant containing no halogen is added to the insulating resin composition. Examples of the non-halogen flame retardant include magnesium hydroxide.

  For example, as the jacket 14, it is preferable to use a non-halogen insulating resin composition obtained by adding magnesium hydroxide to ethylene-vinyl acetate (EVA). In the insulated wire 12 using the insulating resin composition as the jacket 14, It can be used at a rated temperature of 105 ° C.

  As a specific example of the insulated wire 12, 100 parts by weight or more of magnesium hydroxide not subjected to surface treatment and 250 parts by weight with respect to 100 parts by weight of copolymer resin of ethylene and α-olefin having a polar group on the central conductor 13 1 part by weight or more and 10 parts by weight or less of an organosilicon compound comprising an alkyl group containing a methacrylic group or an acrylic group and an atomic group selected from the group consisting of an alkyl group, an alkoxy group and a halogen group. This is a thin-walled, high-strength non-halogen insulated wire in which an insulating resin composition formed by mixing is coated as a jacket 14 and the jacket 14 is irradiated with ionizing radiation.

  As shown in FIG. 4, the adhesive tape 16 includes a base material 16a and an adhesive 16b, and the base material 16a and the adhesive 16b are made of a non-halogen resin composition that does not contain halogen. . For example, as the adhesive tape 16, a base material 16a made of polyester, polyphenylene sulfide, or polyimide is coated with a polyester-based adhesive 16b such as an adhesive having a copolymer polyester as a main component.

  The adhesive tape 16 has a width dimension (a dimension in the length direction of the insulated wire 12 when pasted on the insulated wire 12) of about several millimeters to several centimeters. By sticking this adhesive tape 16 across the width direction from both sides of the parallel surface to the insulated wires 12 in a parallel state, the insulated wires 12 are fixed in a parallel state. It is preferable that the adhesive tape 16 protrudes from both side portions of the insulated wires 12 aligned with each other, and these protruding portions are bonded to each other to form an ear portion 17. By forming the ear portion 17, the fixing strength of the insulated wire 12 by the adhesive tape 16 can be increased. The width of the ear is 0.3 to 1.5 mm, for example, 0.5 mm or 1.0 mm.

  When the adhesive tape 16 is attached to the insulated wires 12 in a parallel state, the adhesive 16 b of the adhesive tape 16 also enters the gap between the insulated wires 12. Thereby, the insulated wires 12 can be reliably bonded and fixed by the adhesive tape 16.

  The adhesive tape 16 is affixed intermittently in the longitudinal direction of the flat cable 11, and the distance between the adhesive tapes 16 that is the part where the adhesive tape 16 in the longitudinal direction of the flat cable 11 is not affixed is 5 cm. That's it. It is preferable that three or more adhesive tapes 16 are attached to one flat cable 11.

  The flat cable 11 has a high degree of freedom in wiring design because the bending direction is not limited between the locations fixed by the adhesive tape 16. Therefore, the user can bend and wire the flat cable 11 freely.

  The flat cable 11 has a length of several tens of centimeters to several meters (about 3 m), and the user cuts it at a portion other than the fixed portion by the adhesive tape 16 and uses it as a necessary length. Can do. At this time, since the insulated wires 12 are separated from each other at the cut portion, the separated insulated wires 12 can be easily end-treated and connected to a wiring board or the like by soldering or the like, or wired with a connector. .

  In this way, the flat cable 11 intermittently fixed in the longitudinal direction by the adhesive tape 16 is bonded at the time of terminal processing as compared with the case where the both sides of the parallel surface of the insulated wire 12 are entirely covered with an adhesive tape or the like. Wiring can be easily performed without performing the troublesome work of peeling off the tape and separating the insulated wire 12 into each core.

  For example, as shown in FIGS. 1 and 2, the connector 18 can be easily attached to the end of the insulated wire 12. Specifically, each of the separated insulated wires 12 is subjected to terminal treatment to expose the central conductor 13, and a terminal is fixed to the central conductor 13 by crimping or the like, and inserted into the connector 18.

  In order to manufacture the flat cable 11 described above, the insulated wires 12 are unwound from the bobbins and arranged in parallel, and then the adhesive tape 16 is intermittently attached from both sides of the parallel surface to form a pair of pressing members. It heat-presses with the thermocompression-bonding stamp which consists of. If it does in this way, the flat cable 11 with which the insulated wire 12 was fixed in the parallel state with the adhesive tape 16 will be obtained. The obtained flat cable 11 is taken up on a take-up reel.

  The pressurizing time, temperature, and pressure at the time of pressing the stamp are preferably 80 to 100 ° C. and the pressure at which the stamp is pressed is set to 0.4 to 0.5 MPa. You may spray 70-120 degreeC hot air on the part which pressure-bonds the adhesive tape 16. FIG. Moreover, you may provide the process for cooling the flat cable 11 after thermocompression bonding after the thermocompression-bonding process by a thermocompression-bonding stamp.

  According to the flat cable 11 according to the above embodiment, the non-halogen adhesive tape 16 having a high adhesive force with respect to the plurality of parallel insulated wires 12 having the non-halogen jacket 14 having a low adhesive strength of the adhesive, Since it was pinched and fixed by sticking from both sides of the parallel surface of the insulated wire 12, the insulated wire 12 can be reliably fixed in a parallel state, and the insulated wire 12 may be scattered during winding or transportation. Trouble can be eliminated. That is, it is possible to improve the manufacturability and the wiring workability by arranging the plurality of insulated wires 12 in parallel while considering the environmental load as halogen-free.

  In the flat cable 11 of the present embodiment, the adjacent insulated wires 12 are arranged without gaps at the fixing points with the adhesive tape 16 so that the width dimension can be made as small as possible, which is advantageous for wiring. As shown in FIG. 5, a slight gap may be provided between adjacent insulated wires 12. For example, a gap may be provided between the insulated wires 12 in order to match the pitch of the insulated wires 12 to the pitch of the terminals of the connector 18. For example, when the pitch of the terminal accommodating portions of the connector 18 is 1.5 mm, the insulated wires 12 are arranged at a pitch of 1.5 mm and fixed with the adhesive tape 16.

  Thus, when providing a clearance gap between the insulated wires 12, it is preferable to stick the adhesive tapes 16 between the insulated wires 12, and in this way, the insulated wires 12 are fixed by the adhesive tape 16. Strength can be increased.

  In addition, when manufacturing the flat cable 11, when arranging the insulated wires 12 without gaps, the insulated wires 12 can be brought into contact with each other with a single guide roller and guided in parallel. In the case of providing, it is preferable to adjust the interval to a predetermined pitch by guiding each insulated wire 12 with a separate guide roller.

  In the above embodiment, the adhesive tape 16 in which the adhesive 16b is provided on the base material 16a has been described as the fixing material for fixing the insulated wires 12 in parallel. However, the fixing material is not limited to the adhesive tape. .

  For example, as shown in FIG. 6, both sides of the parallel surfaces of the insulated wires 12 in a parallel state may be covered with a non-halogen hot melt resin (fixing material) 19 and integrated. In this case, it is preferable to cover both sides of the insulated wires 12 arranged in parallel with the hot melt resin 19. As the hot melt resin 19, a polyolefin-based hot melt resin or a polyamide-based hot melt resin can be used.

  Thus, when fixing the insulated wire 12 in parallel with the hot melt resin 19, a part in the longitudinal direction of the insulated wire 12 juxtaposed with the mold containing the hot melt resin 19 is placed, and the hot melt resin in the mold is placed. 19 is heated or pressurized to melt. Thereby, the hot melt resin 19 is adhered to the insulated wire 12, and then the hot melt resin 19 is cooled and solidified.

  The adhesion of the fixing material to the insulated wire having a non-halogenous jacket was evaluated by performing a 90-degree peel test. Specifically, an adhesive tape is applied to a 20 mm long portion of the insulated wire, and one end of this adhesive tape is peeled off in a direction of 90 degrees with respect to the longitudinal direction of the insulated wire, thereby increasing the strength when the adhesive tape is peeled off. Measurement was made to evaluate adhesion.

(1) Insulated wire The central conductor was covered with a jacket made of a non-halogen insulating resin composition obtained by adding magnesium hydroxide to ethylene-vinyl acetate (EVA). The outer diameter of the electric wire was 0.92 mm.

(2) Adhering structure (Example 1)
An adhesive tape in which a polyester-based halogen-free (HF) adhesive was applied to a halogen-free (HF) substrate formed of polyester was attached to an insulated wire. The adhesive tape was attached from both sides of the insulated wire, and the adhesive tape was attached to both sides of the insulated wire (with ears). The width of the ear was 0.1 mm.

(Comparative Example 1)
An adhesive tape in which a base material made of polyethylene terephthalate is coated with an adhesive comprising a modified polyethylene, an α-olefin copolymer, an acid-modified low molecular weight polyethylene, a brominated flame retardant, a flame retardant aid and an antioxidant. Affixed to insulated wires. The adhesive tape was stuck only on one side of the insulated wire.

(Comparative Example 2)
An adhesive tape in which a polyester-based halogen-free adhesive was applied to a halogen-free substrate formed from polyester was attached to an insulated wire. The adhesive tape was stuck only on one side of the insulated wire.

(3) Evaluation results Table 1 shows the evaluation results.

  As shown in Table 1, in Example 1, the adhesion of the adhesive tape to the insulated wire having the outer sheath of the halogen-free insulating resin composition was very good.

  On the other hand, in the comparative example 1, the adhesive tape contains halogen with respect to the insulated wire having the outer sheath of the halogen-free insulating resin composition. Adhesion is good. Compared to Comparative Example 1, in Example 1, adhesive force was applied from both sides of the insulated wire, so that even a halogen-free adhesive tape could achieve an adhesive force greater than that of Comparative Example 1.

  Moreover, even if it uses the adhesive tape which consists of a halogen-free resin composition by which the polyester-type adhesive agent was apply | coated to the base material formed from polyester like the comparative example 2, an adhesive tape is applied only to one side of an insulated wire. When pasted, it was found that good adhesion could not be obtained.

11: flat cable, 12: insulated wire (electric wire), 13: central conductor (conductor), 14: jacket, 16: adhesive tape (fixing material), 16a: base material, 16b: adhesive, 19: hot melt resin (Fixing material)

Claims (3)

A flat cable in which a plurality of electric wires whose conductors are covered with a jacket are arranged in parallel, and the plurality of electric wires are surrounded and fixed by a fixing material,
The jacket is formed of an insulating resin composition that does not contain halogen, and the insulating resin composition is composed of either an α-olefin resin, an ethylene copolymer resin, or a mixture thereof.
The fixing material is formed from a halogen-free resin composition, and the resin composition is mainly composed of polyester, polyphenylene sulfide, polyimide, polyolefin, polyamide, or a mixture thereof, or a copolyester. A flat cable characterized by that. The flat cable according to claim 1,
The fixing material is an adhesive tape including a base material and an adhesive, and the adhesive is mainly composed of polyester, polyphenylene sulfide, polyimide, a mixture thereof, or a copolyester, A flat cable, characterized in that the flat cable is provided on each side of a parallel surface and has a portion where the adhesive tapes are bonded to each other. The flat cable according to claim 1,
The flat cable is characterized in that the fixing material is a polyolefin-based or polyamide-based hot melt resin, and is fixed by fusion around the electric wire.

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