JP2019021596A - Flat cable, and method of manufacturing the same - Google Patents

Abstract

To provide a flat cable hard for a tensile strength wire to transfer to the inside of a cable, and strengthened an end part in a longitudinal direction of a sectional plane of the flat cable, and a method of manufacturing the same.SOLUTION: A flat cable 10 includes: a plurality of cables 11 disposed in parallel; a first covering layer 12 for covering a plurality of the cable 11; tensile strength wires 13 disposed outside of the first covering layer 12 in parallel with a plurality of the cable 11; and a second covering layer 14 for covering the first covering layer 12, and the tensile strength wires 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flat cable and a manufacturing method thereof.

A flat cable manufactured by arranging a plurality of cables in parallel and coating a resin around the cables by extrusion molding or the like is known. Since the cross section of the flat cable is not circular, there are a longitudinal direction and a short direction in the cross section, and the mechanical strength differs depending on the direction.
In the drop strength test considering actual use, etc., in the case of an impact / tensile test in the short direction of the cross section of the flat cable, the stress is evenly applied to the entire flat cable. However, in the impact / tensile test for the longitudinal direction of the cross section of the flat cable, the stress is not evenly distributed, and the stress is concentrated on the cable on the end side in the longitudinal direction. There is.

  In order to reinforce the end in the longitudinal direction of the cross section of the flat cable, for example, Patent Document 1 discloses a configuration in which tensile strength lines are arranged at both ends in the longitudinal direction of the cross section in parallel with a plurality of cables. . In this case, the impact with respect to the longitudinal direction of the cross section concentrates on the tensile strength line arranged on the end side of the cable, so that breakage and damage of the cable can be suppressed.

Japanese Utility Model Publication No. 56-76220

  With the recent miniaturization of electronic devices, there is an increasing demand for securing strength while minimizing the outer shape of the flat cable. For this purpose, it is necessary to reduce the outer shape of the flat cable by shortening the distance between the cable and the tensile wire while keeping the strength of the flat cable by arranging the cables in parallel between the tensile wires at both ends.

  However, if the distance between the cable and the tensile strength wire is shortened, when the resin is coated around these cables, the tensile strength wire receives the pressure of the resin and comes into contact with the cable. The wall may not be formed. When a flat cable that does not have a resin wall between the cable and the tensile wire is bent, the tensile wire enters between the cable and the resin, and the tensile wire moves inward from the cable and becomes outside the tensile wire. There is a risk that stress concentrates on the cable and the cable is likely to break.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a flat cable in which a tensile strength wire is difficult to move to the inside of the cable and a longitudinal end portion of a cross-section is reinforced, and a manufacturing method thereof. To do.

  In order to solve the above problems, a plurality of cables arranged in parallel, a first coating layer covering the plurality of cables, and a tensile strength arranged in parallel with the plurality of cables outside the first coating layer A flat cable comprising a wire and a second covering layer covering the first covering layer and the tensile strength line is provided.

The plurality of cables may include at least one insulated wire.
The first coating layer and the second coating layer may be made of different resins.
The resin that constitutes the first coating layer may have a higher melting point than the resin that constitutes the second coating layer.
The first covering layer and the second covering layer may be made of the same resin.

  Moreover, this invention is a manufacturing method of the said flat cable, Comprising: The 1st coating process which arrange | positions several cables in parallel and covers the said several cables with a 1st coating layer, The said 1st coating | covering A second covering step in which tensile strength wires are arranged in parallel with the plurality of cables outside the layer, and the first coating layer and the tensile strength wires are covered with a second coating layer. A method for manufacturing a flat cable is provided.

  According to the present invention, a resin wall is reliably formed between the cable and the tensile wire by the first covering layer covering the cable. For this reason, it becomes difficult for a tensile strength wire to move to the inner side of a cable, and the edge part of the longitudinal direction of a section can be reinforced more certainly.

It is a typical sectional view showing a 1st embodiment of a flat cable. It is typical sectional drawing which shows 2nd Embodiment of a flat cable.

  Hereinafter, based on a preferred embodiment, the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a flat cable. The flat cable 10 is arranged in parallel with a plurality of cables 11 arranged in parallel, a first covering layer 12 covering the plurality of cables 11, and outside the first covering layer 12. A tensile strength wire 13 and a second coating layer 14 covering the first coating layer 12 and the tensile strength wire 13 are provided. In the following description, in the cross section of the flat cable 10, the direction in which the plurality of cables 11 are arranged in parallel may be simply referred to as “longitudinal direction”, and the direction orthogonal to the longitudinal direction may be referred to as “short direction”.

  The plurality of cables 11 built in the flat cable 10 are not particularly limited. Examples of the cable 11 include electric wires such as an insulating wire, a coaxial wire, a twisted pair wire, a multi-core wire, and a single core wire. The cable 11 may include at least one insulated wire. When using an insulated wire as the cable 11, the inner conductor is covered with an insulator provided on the outer periphery, so even when adjacent cables 11 come into contact when a plurality of cables 11 are arranged in parallel, The conductors of each cable 11 do not contact each other. A colored insulating layer may be provided on the outer periphery of the cable 11 to facilitate identification of the cable 11. The cross-sectional shape of each cable 11 is not particularly limited, and examples thereof include a circle, an ellipse, and a polygon.

  In FIG. 1, the internal structure of the built-in cable 11 is not shown. Each cable 11 may be a signal line or a power line. Two or more types of cables 11 may be mixed in the flat cable 10. Between cables 11 arranged in parallel, there may be interposition of tensile strength wires, resin wires, plant fibers (such as jute).

  When the cross-sectional shape of the cable is substantially circular or elliptical, the distance between adjacent cables 11 is relatively short at the central portion 11a in the short direction, and the distance between adjacent cables 11 is relatively short at the outer portion 11b in the short direction. It becomes long. Although it is possible to interpose the central portion 11a in the short direction, from the viewpoint of reducing the outer shape of the flat cable 10, it is preferable that the adjacent cables 11 are in close contact with each other in the central portion 11a in the short direction. The gap may be filled in the outer portion 11b in the short direction.

  Examples of the material constituting the conductor of the cable 11 include copper (Cu), aluminum (Al), silver (Ag), iron (Fe), nickel (Ni), or a metal such as an alloy containing at least one of these. It is done. Two or more kinds of metals may be used in combination such as composite, lamination, and mixture. A coating such as plating may be provided on the outer periphery of the metal wire constituting the conductor of the cable 11. The cable 11 may have a shield such as an insulating tape or a braid on which metal layers are laminated.

  Examples of the material constituting the insulator of the cable 11 include at least one of a thermoplastic resin, a thermosetting resin, a photocurable resin, an elastomer, and enamel. As the thermoplastic resin, the thermoplastic resin constituting the insulator of the cable 11 includes polyolefin resin, polyamide resin, polyester resin, polystyrene resin, polynitrile resin, polymethacrylate resin, polyvinyl chloride resin. , Fluorine resin, urethane resin, cellulose resin, imide resin, thermoplastic elastomer and the like.

  The 1st coating layer 12 has the main wall part 12a which covers the cable 11 in a longitudinal direction, and the side wall part 12b which covers the cable 11 in a transversal direction. The main wall portion 12a of the first covering layer 12 covers the plurality of cables 11 in a lump and holds the arrangement in which the plurality of cables 11 are arranged in parallel. The side wall part 12b of the 1st coating layer 12 has covered each one cable 11 in the edge part of a longitudinal direction. The outer surface of the main wall portion 12 a of the first covering layer 12 may be substantially flat and may have a surface undulation corresponding to the outer peripheral surface of the cable 11.

  The 2nd coating layer 14 has the main wall part 14a which covers the 1st coating layer 12 in a longitudinal direction, and the side wall part 14b which covers the 1st coating layer 12 in a transversal direction. A tensile strength line 13 is provided on at least one side wall portion 14b of the second coating layer 14. In the present embodiment, tensile strength wires 13 are embedded in both side wall portions 14b. The outer surface of the main wall portion 14 a of the second covering layer 14 may be substantially flat, and may have a surface undulation corresponding to the outer peripheral surface of the cable 11 or the first covering layer 12.

  The first covering layer 12 and the second covering layer 14 are each made of an electrical insulator such as an insulating resin. Insulating resins include polyolefin resins, polyamide resins, polyester resins, polystyrene resins, polynitrile resins, polymethacrylate resins, polyvinyl chloride resins, fluorine resins, urethane resins, cellulose resins, and imides. And thermoplastic resins such as thermoplastic resins and thermoplastic elastomers. The flat cable 10 is preferably easily bent in the short direction. For that purpose, it is preferable that the coating layers 12 and 14 are comprised from flexible resin.

  As the tensile strength wire 13, a wire material having high strength and capable of withstanding high tension is preferable. Specific examples of the tensile strength wire 13 include aromatic polyamide (aramid), aliphatic polyamide (nylon), polyester, fibers such as metal, fine wires, stranded wires, and the like. By providing the tensile strength wire 13, when a load such as bending or tension or impact is applied to the flat cable 10, breakage or damage of the built-in cable 11 is suppressed, and bending resistance and tension resistance are improved. The

  As a method of manufacturing the flat cable 10 of the present embodiment, first, a first covering step of covering the plurality of cables 11 arranged in parallel with the first covering layer 12 is performed, and then the first covering is performed. A method of performing a second coating step in which the tensile wires 13 are arranged in parallel with the plurality of cables 11 outside the layer 12 and the first coating layer 12 and the tensile wires 13 are covered with the second coating layer 14 is given. It is done.

In the first covering step, the first covering layer 12 is formed around the plurality of cables 11 arranged in parallel, for example, by extrusion molding of resin. Thereby, the side wall part 12b is reliably formed as a part in which the 1st coating layer 12 covers the outer periphery of the cable 11 in the both ends of the longitudinal direction where the cable 11 is paralleled.
Of the first covering step, the step of arranging the plurality of cables 11 in parallel may be carried out before introducing each cable 11 into an apparatus for extruding the first covering layer 12. You may carry out inside the apparatus which performs.

Next, in the second covering step, after the tensile wires 13 are arranged in parallel on the outside where the plurality of cables 11 are arranged in parallel, around the first covering layer 12 and the tensile wires 13, for example, by extrusion molding of resin, A second coating layer 14 is formed. At this time, since the first coating layer 12 has the side wall portions 12b at both ends in the parallel direction of the cable 11, the tensile strength wire 13 contacts the outer surface of the first coating layer 12 during the second coating step. Even so, the tensile strength wire 13 does not come into contact with the cable 11, and a resin wall is reliably formed between the cable 11 and the tensile strength wire 13.
Of the second coating step, the step of arranging the tensile wires 13 in parallel with the plurality of cables 11 may be performed before the tensile wires 13 are introduced into a device that performs extrusion molding of the second coating layer 14. It may be carried out inside the apparatus for performing the extrusion molding.

  At the interface between the first coating layer 12 and the second coating layer 14, the resins of the coating layers 12 and 14 are easily adhered to each other. For this reason, even if the outer periphery of the tensile strength wire 13 is in contact with the outer periphery of the first coating layer 12, the periphery of the tensile strength wire 13 is reliably covered with the resin. Even when the adhesion of the tensile wire 13 to the covering layers 12 and 14 is low, the entire outer periphery of the tensile wire 13 is wrapped with resin, so that the positional relationship of the tensile wire 13 in the flat cable 10 is maintained. Therefore, even if the flat cable 10 is bent, the arrangement relationship between the cable 11 and the tensile wire 13 is not lost, and even if an impact is applied to both ends in the longitudinal direction of the cross section, the stress is concentrated on the tensile wire 13. Is protected. For this reason, the flat cable 10 of this embodiment is excellent in bending resistance and tension resistance even if the outer shape is reduced.

  The thickness of the side wall portion 12b in the first covering layer 12 is preferably thin as long as the purpose of protecting the cable 11 can be achieved. Thereby, the external shape of the flat cable 10 can be suppressed small. Note that whether or not the outer periphery of the tensile strength wire 13 contacts the outer periphery of the first covering layer 12 is not particularly limited. The outer periphery of the tensile strength wire 13 is in contact with the outer periphery of the first coating layer 12 at some locations in the length direction of the flat cable 10, and the outer periphery of the tensile strength wire 13 and the first coating layer 12 at other locations. The second coating layer 14 may be present between the outer periphery of the first covering layer 14 and the outer periphery.

  The first coating layer 12 and the second coating layer 14 may be made of the same resin. In this case, the adhesion between the first coating layer 12 and the second coating layer 14 becomes higher. For example, a polyvinyl chloride (PVC) resin is mentioned as an example of resin used when the coating layers 12 and 14 are comprised from the same resin. An interface that can be observed with the naked eye or an optical microscope may be formed between the coating layers 12 and 14.

  The first coating layer 12 and the second coating layer 14 may be made of different resins. When the second coating step is performed after the first coating step, it is preferable that the first coating layer 12 is not melted or fluidized in the second coating step. Therefore, when using resin which shows melting | fusing point for each coating layer 12 and 14, it is desirable that resin which comprises the 1st coating layer 12 is higher melting | fusing point than resin which comprises the 2nd coating layer 14. . An example of such a resin is a combination in which the first coating layer 12 is a fluororesin and the second coating layer 14 is a polyvinyl chloride (PVC) resin. Examples of the melting point difference between the resins constituting the coating layers 12 and 14 include 10 ° C. or more, about 20 ° C., about 30 ° C., and the like.

  FIG. 2 shows a second embodiment of the flat cable. The flat cable 20 is an example in which each of the cables 15 arranged in parallel in the first covering layer 12 uses a twin-core cable such as Twinax. The description which overlaps with 1st Embodiment about each coating layer 12 and 14 and the tensile strength line 13 may be abbreviate | omitted.

  In the case of the present embodiment, the cable 15 includes two single-core cables 16 that are arranged in parallel without being twisted together, and a covering 17 that covers these single-core cables 16. From the viewpoint of reducing the outer shape of the flat cable 15, it is preferable to match the direction in which the two single-core cables 16 are arranged in parallel with the longitudinal direction of the flat cable 15.

  Each single-core cable 16 includes a conductor 16a and an insulator 16b that covers the conductor 16a. The insulator 16 b is a coating that covers the conductor 16 a for each single-core cable 16. When providing a shield outside the conductor 16a, a shield may be provided for each single-core cable 16, or a shield that collectively surrounds the two single-core cables 16 may be provided.

  As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the summary of this invention. Examples of the modification include addition, replacement, omission, and other changes of components in each embodiment.

DESCRIPTION OF SYMBOLS 10,20 ... Flat cable, 11 ... Cable, 12 ... 1st coating layer, 13 ... Tensile wire, 14 ... 2nd coating layer, 15 ... Two-core cable, 16 ... Single-core cable, 17 ... Coating

Claims (6)

A plurality of cables arranged in parallel;
A first covering layer covering the plurality of cables;
Tensile wires arranged in parallel with the plurality of cables outside the first covering layer;
A second coating layer covering the first coating layer and the tensile strength line;
A flat cable characterized by comprising:   The flat cable according to claim 1, wherein the plurality of cables include at least one insulated wire.   The flat cable according to claim 1 or 2, wherein the first covering layer and the second covering layer are made of different resins.   The flat cable according to claim 3, wherein the resin constituting the first covering layer has a higher melting point than the resin constituting the second covering layer.   The flat cable according to claim 1 or 2, wherein the first covering layer and the second covering layer are made of the same resin. It is a manufacturing method of a flat cable given in any 1 paragraph of Claims 1-5,
A first covering step of arranging a plurality of cables in parallel and covering the plurality of cables with a first covering layer;
A second covering step in which a tensile wire is arranged in parallel with the plurality of cables outside the first covering layer, and the first covering layer and the tensile wire are covered with a second covering layer;
A method of manufacturing a flat cable, comprising:

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