JP6835612B2 - Flat electric wire / flat cable - Google Patents

Description

The present invention relates to a flat electric wire / flat cable.

In recent years, interest in environmental issues has been increasing worldwide, and electric wires and cables using non-halogen compositions that do not generate harmful halogen gas during incineration are becoming widespread. In addition, various proposals have been made for electric wires and cables using non-halogen compositions.

As the non-halogen composition used for electric wires and cables, a non-halogen flame-retardant resin composition obtained by blending a polyolefin resin with a metal hydroxide as a flame retardant has come to be widely used.

For example, in Patent Document 1 below, ethylene / acrylic acid ester copolymer (a) and / or ethylene / vinyl acetate copolymer (b) 20 to 80% by mass, acrylic rubber (c) 10 to 40% by mass, And, if necessary, 20% by mass or less of polyethylene (e) modified with an unsaturated carboxylic acid or a derivative thereof and / or a styrene block copolymer containing 10 to 40% by mass of an acrylic acid-modified polyolefin (d). (F) A crosslinked product of a composition containing 150 to 250 parts by mass of a metal hydrate (g) surface-treated with a silane coupling agent with respect to 100 parts by mass of a resin mixture containing 20% by mass or less. Insulated wires that are coated have been proposed.

In order to impart sufficient flame retardancy to electric wires and cables, it is necessary to add a large amount of metal hydrate such as magnesium hydroxide as in the technique described in Patent Document 1. However, there is a problem that the surface activity of the electric wire / cable is lowered, it is easily damaged (whitened easily), and the traumatic resistance is lowered.

The above-mentioned problem of deterioration in trauma resistance becomes remarkable especially in the case of flat electric wires and flat cables.
FIG. 7 is a cross-sectional view for explaining a flat electric wire / flat cable. The flat electric wire / flat cable 70 includes an insulating wire core 74 made of a conductor 72 such as a copper wire and an insulator 73 that covers the outer periphery thereof, and a coating layer 75 that covers the outer circumference of the insulating wire core 74.
As shown in FIGS. 8A and 8B, for example, such a flat electric wire / flat cable 70 is passed through a hollow portion 811 of a tubular CD tube (flexible electric wire tube made of synthetic resin) 81. When attempting to wire, there is a problem that the curved outer peripheral surface of the flat electric wire / flat cable 70 interferes with the inner wall of the CD tube 81 (deterioration of wire permeability) and is easily damaged.

The linearity can be improved by adding a large amount of lubricant or the like to the coating layer 75, but in this case, the electrical characteristics such as the insulating property are deteriorated.

Japanese Unexamined Patent Publication No. 2001-325833

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flat electric wire / flat cable having excellent linearity and trauma resistance while maintaining flame retardancy and electrical characteristics. There is.

In order to achieve the above-mentioned object, the "flat electric wire / flat cable" according to the present invention is characterized by the following (1) to (3).
(1)
A flat type having a plurality of insulated wire cores, an inner layer that covers the plurality of insulated wire cores so as to bundle them, a flame-retardant layer that covers the inner layer, and a traumatic-resistant layer that covers a part of the flame-retardant layer. It is an electric wire / flat cable
The plurality of the insulated wire cores
Arranged in a predetermined arrangement direction according to the specifications of the flat electric wire / flat cable,
The flame-retardant layer is
The flame-retardant layer is sandwiched between the pair of the trauma-resistant layers in the arrangement direction, so that the covering portion covered by the pair of the trauma-resistant layers and the exposed portion not covered by the pair of the trauma-resistant layers. The flame-retardant layer is covered with the trauma-resistant layer so that the ratio of the surface area of the covering portion to the surface area of the exposed portion is 25:75 to 5:95. The thickness of the flame-retardant layer is 0.05 mm or more,
The trauma-resistant layer contains a substance that reduces the insulating property.
Must be a flat electric wire / cable.
(2)
In the flat electric wire / flat cable described in (1) above,
The trauma-resistant layer
The flame-retardant layer is covered so as to spread along the surface of the flame-retardant layer from a start point which is the outermost portion of the flame-retardant layer in the arrangement direction to a predetermined end point.
The end point is
It is a reference point that is the closest to the start point among the points where the length between both outer peripheral surfaces of the flame retardant layer is maximum in the thickness direction orthogonal to the arrangement direction, or the difficulty in the arrangement direction. A point between the central point, which is the central part of the fuel layer, and the reference point.
Must be a flat electric wire / cable.
(3)
In the flat electric wire / flat cable described in (2) above,
The flame-retardant layer
The length between both outer peripheral surfaces of the flame-retardant layer at the center position of the insulated wire core closest to the starting point among the plurality of insulated wire cores is maximized.
Must be a flat electric wire / cable .

According to the flat electric wire / flat cable having the configuration of (1) above, a pair of trauma-resistant layers are configured to sandwich the flame-retardant layer in the arrangement direction of the insulating wire core, thereby being covered by the trauma-resistant layer. There are no exposed parts, and the traumatic layer contains a substance that reduces the insulation. Generally, if a large amount of lubricant or the like is added in order to improve the linearity, the electrical properties such as insulation deteriorate, but in the present invention, the scratch resistance formed on a part of the flame retardant layer is deteriorated. By including a substance such as a lubricant that lowers the insulating property in the layer, it is possible to avoid blending a large amount of the lubricant and suppress deterioration of electrical characteristics. Further, by providing the traumatic layer at the portion that interferes with the inner wall of the CD tube, for example, the traumatic resistance of the flat electric wire / cable can be efficiently improved. Further, by covering the outer periphery of the flat electric wire / flat cable with the flame-retardant layer, it is possible to maintain the flame-retardant property as in the conventional technique.
Further, according to the flat electric wire / flat cable having the configuration of (1) above, the ratio of the surface area of the flame-retardant layer covered by the trauma-resistant layer is specified. That is, the ratio of the surface area of the covering portion to the surface area of the exposed portion is set to be 25:75 to 5:95.
It has been clarified that by forming the trauma-resistant layer so as to satisfy such a numerical range, damage to the coating layer is suppressed as compared with the case where the numerical range is not satisfied.
The numerical range preferably satisfies the above numerical range, but is more preferably 15:85 to 5:95.

Therefore, according to the present invention, it is possible to provide a flat electric wire / flat cable having excellent linearity and trauma resistance while maintaining flame retardancy and electrical characteristics.

According to the flat electric wire / flat cable having the configuration of (2) above, the trauma-resistant layer covers the flame-retardant layer so as to spread along the surface of the flame-retardant layer from a predetermined start point to the end point, and also covers the end point. Is configured to be a predetermined reference point or a location between a predetermined center point and the reference point. By specifying the range in which the traumatic layer covers the flame-retardant layer in this way, it is possible to provide a flat electric wire / flat cable having excellent flame retardancy, electrical characteristics, linearity and trauma resistance. .. The meanings of the start point, end point, reference point and center point will be described in detail below.

According to the flat electric wire / flat cable having the configuration of (3) above, the flame-retardant layer has the maximum length between both outer peripheral surfaces of the flame-retardant layer at the center position of the insulating wire core closest to the starting point. It is configured as follows. By specifying the location of the reference point in this way, it is possible to provide a flat electric wire / flat cable having excellent flame retardancy, electrical characteristics, linearity, and trauma resistance.

According to the present invention, it is possible to provide a flat electric wire / flat cable having excellent linearity and traumatic resistance while maintaining electric flammability and electrical characteristics.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments for carrying out the invention described below (hereinafter, referred to as "embodiments") with reference to the accompanying drawings. ..

FIG. 1 is a cross-sectional view for explaining an embodiment of a flat electric wire / flat cable of the present invention. FIG. 2 is a cross-sectional view of a flat electric wire / cable for explaining a start point, an end point, a reference point, a center point, and the like. FIG. 3 is a cross-sectional view for explaining a preferred embodiment of the flat electric wire / flat cable of the present invention. FIG. 4 is a cross-sectional view for explaining another embodiment of the flat electric wire / flat cable of the present invention. 5 (a) and 5 (b) are cross-sectional views for explaining another embodiment of the flat electric wire / flat cable of the present invention. 6 (a) and 6 (b) are cross-sectional views for explaining another embodiment of the flat electric wire / flat cable of the present invention. FIG. 7 is a cross-sectional view for explaining a flat electric wire / flat cable. 8 (a) and 8 (b) describe a situation in which a flat electric wire / flat cable is to be passed through a hollow portion of a tubular CD tube (flexible electric wire tube made of synthetic resin). It is a figure for.

Hereinafter, embodiments of the flat electric wire / flat cable according to the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view for explaining an embodiment of a flat electric wire / flat cable of the present invention.
As shown in FIG. 1, the flat electric wire / flat cable 10 according to the present embodiment includes a plurality of insulated wire cores 12, an inner layer 14 that covers the insulated wire cores 12 so as to bundle them, and a flame retardant that covers the inner layer 14. The layer 16 is further provided with the trauma-resistant layers 18A and 18B that cover a part of the flame-retardant layer 16. Further, the insulated wire cores 12 are arranged in a predetermined arrangement direction according to the specifications of the flat electric wire / flat cable 10. This arrangement direction does not have to coincide with the longitudinal direction of the flat electric wire / flat cable 10. For example, this arrangement direction may be a direction orthogonal to the longitudinal direction of the flat electric wire / flat cable 10. Further, in the flame-retardant layer 16, the flame-retardant layer 16 is sandwiched between the pair of trauma-resistant layers 18A and 18B in the above-mentioned arrangement direction. With this configuration, a covering portion A covered with the pair of trauma-resistant layers 18A and 18B and an exposed portion B not covered with the pair of the trauma-resistant layers 18A are formed.

In the flat electric wire / flat cable 10 of the present invention, the traumatic layers 18A and 18B contain a substance that lowers the insulating property. The substance that lowers the insulating property is typically a lubricant, but other substances such as flame retardants, fillers, antioxidants, and cross-linking agents can be mentioned.

The plurality of insulated wire cores 12 are composed of a conductor 122 such as a copper wire and an insulator 124 that covers the outer periphery of the conductor 122. The conductor 122 may be formed by bundling only one wire or by bundling a plurality of wires. As the material of the conductor 122, for example, a conductive metal such as copper, plated copper, copper alloy, aluminum, and aluminum alloy can be used.
The insulator 124 is not particularly limited and can be appropriately selected from known insulators. For example, one made of polyethylene, cross-linked polyethylene, a vinyl mixture or the like is preferably used.

The inner layer 14 can be formed by using a known resin composition and is not particularly limited. However, in the present invention, the polyolefin-based resin composition is crosslinked, the obtained crosslinked body is extruded, and the outer periphery of the insulating wire core 12 is formed. It can be formed by forming a layer made of a crosslinked body and foaming the layer if necessary.

The polyolefin-based resin composition contains a base resin containing a polyolefin-based resin, a cross-linking agent, a cross-linking aid, and, if necessary, a foaming agent.
The polyolefin-based resin is not particularly limited, and is, for example, high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (L-LDPE), and ultra-low-density polyethylene. Polyethylene (PE) such as (V-LDPE), polypropylene (PP), ethylene-propylene copolymer (EPR), ethylene-vinyl acetate copolymer (EVA), ethylene-methylacrylate copolymer (EMA), and Examples thereof include polyethylene-ethyl acrylate copolymer (EEA). These can be used alone or in combination of two or more.
Polyolefin resin is preferably a density of ^{0.85~1.00g / cm 3, 0.90~0.97g / cm} 3 is more preferable. By using a polyolefin resin having a density in the above range, the mechanical properties can be further improved. Further, the polyolefin-based resin preferably has a melt viscosity (MFR) of 0.4 to 2.5, more preferably 0.4 to 1.0. When the melting temperature of the polyolefin resin is in the above range, the extrusion processability is improved.
The density referred to in the present invention is a value measured in accordance with JIS K7112, and MFR is a value measured in accordance with JIS K7210 at 190 ° C. and a 2.16 kgf load.

As the base resin, components other than the above-mentioned polyolefin-based resin can be appropriately used as needed as long as the effects of the present invention are not impaired. Examples of such a component include a rubber component, and examples thereof include ethylene / propylene / non-conjugated diene copolymer rubber (EPDM) and styrene / ethylene / butylene / styrene copolymer (SEBS).
The amount of the rubber component to be blended is preferably 60 to 95 parts by weight for the polyolefin resin and 5 to 40 parts by weight for the rubber component when the entire base resin is 100 parts by weight.

Examples of the cross-linking agent include, but are not limited to, organic peroxides. Specifically, the cross-linking agent includes dicumyl peroxide (DCP), di-tert-butyl peroxide, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane, 2,5. -Dimethyl-2,5-di- (tert-butylperoxy) hexin-3,1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert-butylperoxy) -3, 3,5-trimethylcyclohexane, n-butyl-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxy Examples thereof include isopropyl carbonate, diacetyl peroxide, lauroyl peroxide, tert-butyl cumyl peroxide and the like. These can be used alone or in combination of two or more.

The cross-linking aid is not particularly limited, and examples thereof include compounds having two or more double bonds in the molecule, and specific examples thereof include 1,4-butanediol diacrylate and 1,6-hexanediol diacrylate. , Neopentyl glycol diacrylate, diethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol diacrylate, trimethylolpropylene diacrylate, and diacrylate such as polypropylene glycol diacrylate; 1,3-butanediol dimethacrylate, 1,6 -Dimethacrylates such as hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate; such as trimethylolpropane triacrylate, tetramethylolmethane triacrylate, and pentaerythritol triacrylate. Triacrylates; trimethacrylates such as trimethylolpropane trimethacrylate and trimethylolethane trimethacrylate; tetraacrylates such as pentaerythritol tetraacrylate and tetramethylolmethane tetraacrylate; divinyl aromatic compounds such as divinylbenzene; triallyl cyanurate, And cyanurates such as triallyl isocyanurate; diallyl compounds such as diallyl phthalate; triallyl compounds and the like. These can be used alone or in combination of two or more.

By achieving a quantitative balance between the cross-linking agent and the cross-linking aid, it is possible to provide good extrusion characteristics even after the polyolefin-based resin composition is cross-linked.
That is, the blending amount of the cross-linking agent is preferably 0.02 to 0.5 parts by weight with respect to 100 parts by weight of the base resin. When the blending amount of the cross-linking agent is 0.02 parts by weight or more, good extrusion characteristics can be provided and the tensile strength is improved. When it is 0.5 parts by weight or less, good extrusion characteristics can be provided and the appearance after extrusion is also improved.
The amount of the cross-linking aid compounded is preferably 1 to 3 times the amount of the cross-linking agent. When the blending amount of the cross-linking aid is 1 times or more the amount of the cross-linking agent, good extrusion characteristics can be provided and the appearance after extrusion is also improved. When the amount is 3 times or less, good extrusion characteristics can be provided and the tensile strength is improved.

As the foaming agent, a known chemically decomposed foaming agent or the like that generates carbon dioxide gas, nitrogen gas or the like by chemical decomposition can be used. For example, an azo compound such as azodicarbonamide (ADCA), NN'- Examples thereof include nitroso compounds such as dinitrosopentamethylenetetramine, hydrazine derivatives such as 4,4'-oxybis (benzenesulfonylhydrazide) (OBSH) and hydrazodicarbonamide (HDCA), and sodium hydrogencarbonate.
The blending amount of the foaming agent is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the base resin.

Further, the inner layer 14 is blended with various known additives such as a filler, an antioxidant, a processing aid, a neutralizing agent, an ultraviolet absorber, a pigment, an antistatic agent, and a dispersant, if necessary. You can also.

The inner layer 14 can be formed by a known means. For example, the above various components are mixed to prepare a polyolefin-based resin composition, which is crosslinked to obtain a crosslinked body of the polyolefin-based resin composition, which is extruded to the outer periphery of the insulating wire core 12 and foamed if necessary. The inner layer 14 is formed by going through each step.

The flame-retardant layer 16 preferably has an oxygen index of 22 or more measured in accordance with JIS K7201. Therefore, it is preferable to use the following resin composition for flame-retardant layer.
The flame-retardant layer resin composition may contain a base resin containing a polyolefin resin, a cross-linking agent, a cross-linking aid, and a flame retardant.
The base resin containing the polyolefin resin, the cross-linking agent and the cross-linking aid, and the blending amounts thereof are the same as those of the polyolefin-based resin composition used when forming the inner layer 14.
Examples of the flame retardant include organic bromine-containing flame retardants such as brominated ethylene bisphthalimide derivative, bisbrominated phenylterephthalamide derivative, brominated bisphenol derivative, and 1,2-bis (bromophenyl) ethane; magnesium hydroxide. , And inorganic flame retardants such as aluminum hydroxide; phosphoric acid flame retardants such as aromatic condensed phosphate, ammonium polyphosphate, and melamine phosphate; ammonium polyphosphate, melamine polyphosphate, piperazine polyphosphate, pyrophosphate. Examples thereof include intomesent flame retardants such as ammonium, melamine pyrophosphate, and piperazine pyrophosphate. The blending amount of the flame retardant is preferably 5 parts by weight or more, more preferably 10 to 30 parts by weight, based on 100 parts by weight of the base resin.
Further, the flame-retardant layer 16 can be blended with various known additives such as an antioxidant and a colorant, if necessary.
Further, the resin composition for the flame-retardant layer may contain a substance that lowers the insulating property such as a lubricant, which will be described later, but the content thereof is set so as not to lower the electrical characteristics of the flame-retardant layer. It is preferably 10 parts by weight or less with respect to 100 parts by weight of the resin composition for use.

The flame-retardant layer 16 can be formed by cross-linking the resin composition for the flame-retardant layer, extruding the obtained cross-linked product, and providing a layer made of the cross-linked product on the outer periphery of the inner layer 14.
The thickness of the flame-retardant layer 16 is preferably 0.05 mm or more, more preferably 0.1 mm to 0.3 mm, in order to impart sufficient flame retardancy.

The trauma-resistant layers 18A and 18B are layers responsible for the linearity and trauma resistance of the flat electric wire / flat cable 10 of the present invention, and have a JISA hardness of 80 or more, preferably 83 or more. Therefore, it is preferable to use the following resin composition for a traumatic layer.
The above-mentioned resin composition for a traumatic layer contains a polyolefin-based resin, a substance that lowers the insulating property, and if necessary, other additives.
Examples of the polyolefin resin include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (L-LDPE), ultra-low-density polyethylene (V-LDPE), and the like. Polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA) and the like are preferable. These can be used alone or in combination of two or more.
Polyolefin resin is preferably a density of ^{0.90~0.95g / cm 3, 0.91~0.95g / cm} 3 is more preferable. By using a polyolefin resin having a density in the above range, linearity and trauma resistance can be further improved.

The substance that lowers the insulating property is typically a lubricant, but other substances such as paraffin oils used as processing aids, petroleum oils such as naphthenic oil, and pigments such as metal oxides are used. Can be mentioned. Specific examples of the lubricant include hydrocarbon-based lubricants, fatty acid-based lubricants, and silicone-based lubricants. The substance that lowers the insulating property is preferably 0.1 to 10.0 parts by weight, more preferably 0.1 to 5.0 parts by weight, based on 100 parts by weight of the polyolefin resin.

Further, on the trauma-resistant layers 18A and 18B, various known additives such as fillers, antioxidants, processing aids, neutralizers, ultraviolet absorbers, pigments, antistatic agents, and dispersants are used, if necessary. Can also be blended.

The thickness of the trauma-resistant layers 18A and 18B is preferably 0.01 mm to 0.5 mm, more preferably 0.01 mm to 0.2 mm, from the viewpoint of suppressing a decrease in insulation resistance.

The total thickness of the inner layer 14, the flame-retardant layer 16, and the trauma-resistant layers 18A and 18B can be the thickness specified in JIS C3605.

According to the flat electric wire / flat cable 10 of the above embodiment, the pair of trauma-resistant layers 18A and 18B are configured to sandwich the flame-retardant layer 16 in the arrangement direction of the insulating wire core 12, thereby causing the trauma-resistant layer 18A. , There is an exposed portion B not covered by 18B, and the traumatic layers 18A and 18B contain a substance that lowers the insulating property. In the present invention, by including a substance that lowers the insulating property such as a lubricant in the trauma-resistant layers 18A and 18B formed on a part of the flame-retardant layer 16, it is possible to avoid a large amount of the lubricant and the like, and electricity. Deterioration of target characteristics can be suppressed. Further, by providing the trauma-resistant layers 18A and 18B at the interference portion with the inner wall of the CD tube, for example, the traumatic resistance of the flat electric wire / flat cable 10 can be efficiently improved. Further, by covering the outer periphery of the flat electric wire / flat cable 10 with the flame-retardant layer 16, it is possible to maintain the flame-retardant property as in the prior art.

In the flat electric wire / cable of the present invention, the flame-retardant layers 18A and 18B are flame-retardant from the start point where the traumatic layers 18A and 18B are the outermost points of the flame-retardant layer 16 in the arrangement direction of the insulating wire core 12 to a predetermined end point. A location where the flame-retardant layer is covered so as to spread along the surface of the layer, and the end point is the maximum length between both outer peripheral surfaces of the flame-retardant layer in the thickness direction orthogonal to the arrangement direction. Of these, it is preferable that the reference point is the closest to the starting point, or the center point between the center point and the reference point, which is the center of the flame-retardant layer in the arrangement direction. According to this form, it is possible to provide a flat electric wire / flat cable having further excellent flame retardancy, electrical characteristics, linearity and trauma resistance. This will be described below.

FIG. 2 is a cross-sectional view of a flat electric wire / cable for explaining the start point, end point, reference point, center point, and the like.
As shown in FIG. 2, the start point referred to in the present invention is a point D which is the outermost point of the flame retardant layer 16 in the arrangement direction C of the insulating wire core 12. The end point is a point E where the trauma-resistant layers 18A and 18B extending from the start point D toward the center of the flat electric wire / flat cable 10 are interrupted, in other words, covered by the trauma-resistant layers 18A and 18B. It is a boundary point between the covered portion A and the exposed portion B not covered by the traumatic layers 18A and 18B.
The reference point is a point G that is the closest to the start point among the points where the length F between both outer peripheral surfaces of the flame retardant layer 16 is maximum in the thickness direction orthogonal to the arrangement direction C of the insulating wire core 12. Is. In the flat electric wire / flat cable 10 of the form shown in FIG. 2, since the cross section is elliptical, the starting point of the curved surface forming the ellipse corresponds to the reference point G.
The center point is a point H which is a central point of the flame retardant layer 16 in the arrangement direction C of the insulating wire core 12. In other words, the center point H can be said to be the central portion in the thickness direction of the flat electric wire / flat cable 10.
As described above, the trauma-resistant layers 18A and 18B are formed so as to spread along the surface of the flame-retardant layer 16 from the start point D to the end point E, and the end point E is the reference point G or FIG. As shown by, it is preferably a position between the center point H and the reference point G. According to this form, it is possible to provide a flat electric wire / flat cable having excellent flame retardancy, electrical characteristics, linearity and trauma resistance.

Further, in the flat electric wire / flat cable 10 of the present invention, the length F between both outer peripheral surfaces of the flame retardant layer 16 is set at the center position of the insulated wire core 12 closest to the start point D of the insulated wire core 12. It is preferably the maximum. According to this form, it is possible to provide a flat electric wire / flat cable having excellent flame retardancy, electrical characteristics, linearity and trauma resistance.
FIG. 3 is a cross-sectional view for explaining an embodiment of such a flat electric wire / flat cable of the present invention (for explanation, only one insulated wire core 12 is shown).
The flat electric wire / flat cable 10 shown in FIG. 3 is formed so that the trauma-resistant layers 18A and 18B extend from the start point D to the end point E along the surface of the flame-retardant layer 16. The insulated wire core 12 is the insulated wire core closest to the start point D of the insulated wire cores 12, and at the center position I thereof, the length F between both outer peripheral surfaces of the flame retardant layer 16 is the maximum. .. The virtual line extending from the center position I in the direction orthogonal to the arrangement direction C of the insulating wire core 12 (thickness direction) may or may not intersect the reference point G as shown in FIG.

The location of the end point E can be set arbitrarily. For example, a virtual wire extending from the center position I of the insulated wire core 12 closest to the start point D of the insulated wire core 12 in the direction orthogonal to the arrangement direction C of the insulated wire core 12 (thickness direction) and the flame-retardant layer. The end point E may be set within a range of ± 25% in the arrangement direction from the intersection.

Further, in the flat electric wire / flat cable 10 of the present invention, the flame-retardant layer 16 is a trauma-resistant layer so that the ratio of the surface area of the covering portion A to the surface area of the exposed portion B is 25:75 to 5:95. It is preferably covered with 18A and 18B. It has been clarified that by forming the trauma-resistant layers 18A and 18B so as to satisfy such a numerical range, damage to the coating layer is suppressed as compared with the case where the numerical range is not satisfied. The numerical range is more preferably 15:85-5:95.

In the above embodiment, the end points E of the trauma-resistant layers 18A and 18B are smoothly formed so as not to have a step with respect to the flame-retardant layer 16, but the present invention is not limited to this, and any shape is used. be able to. Further, as shown in FIG. 4, the trauma-resistant layers 18A and 18B can be formed so that the shape of the flat electric wire / flat cable is elliptical, including the trauma-resistant layers 18A and 18B.
In the above embodiment, the flat electric wire / flat cable 10 has an elliptical cross-sectional shape as an example, but the present invention is not limited to this, and the flat electric wire / flat cable 10 has a cross-sectional shape. Can be a non-circular shape, for example, a dumpling type shown in FIG. 5 (a) or a dumbbell type shown in FIG. 5 (b) (for explanation, a flame-retardant layer and a trauma-resistant layer). Is not shown).
Further, in the above embodiment, a plurality of insulated wire cores 12 are arranged in a row in the arrangement direction C as an example, but the present invention is not limited to this, and for example, a plurality of rows as shown in FIG. 6A. Insulated wire cores 12 are arranged alternately in the arrangement direction C, or a plurality of rows of insulated wire cores 12 are arranged in the arrangement direction C and in the thickness direction as shown in FIG. 6B. There can be.

The trauma-resistant layers 18A and 18B can be formed by extruding the resin composition for the trauma-resistant layer and providing a layer made of the composition in a predetermined range on the outer circumference of the flame-retardant layer 16.

Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited to the following examples.

The following materials were used.
(Injury resistant layer)
Polyolefin resin: NUC-8450 manufactured by EVA NUC Co., Ltd.
Lubricants: Shinetsu Silicone Co., Ltd. X-22-2125H
Antioxidant: BASF Co., Ltd. Ilganox 1010

(Flame-retardant layer)
Polyolefin resin: EVA Mitsubishi Chemical Corporation A543
Rubber component: EPDM JSR Corporation EP07AP
Flame Retardant: Magnesium Hydroxide Antioxidant: BASF Co., Ltd. Ilganox 1010
Cross-linking agent: Kayahexa AD (2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane) manufactured by Kayaku Akzo Corporation
Cross-linking aid: TEGDMA (triethylene glycol dimethacrylate) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.

(Inner layer)
Polyolefin resin: EVA Mitsubishi Chemical Corporation A543
Rubber component: EPDM JSR Corporation EP07AP
Cross-linking agent: Kayahexa AD (2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane) manufactured by Kayaku Akzo Corporation
Cross-linking aid: TEGDMA (triethylene glycol dimethacrylate) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.
Filler: Magnesium hydroxide Lubricant: Calcium stearate manufactured by NOF Corporation Foaming agent: ADCA (azodicarbonamide) EV405D manufactured by Eiwa Kasei Kogyo Co., Ltd.

Examples 1-76
According to the blending amounts (parts by weight) shown in Tables 1 to 5, each component excluding the cross-linking agent and the cross-linking aid is kneaded with a kneader, and the polyolefin resin composition A for the trauma-resistant layer and the flame-retardant layer are used. A polyolefin-based resin composition B and a polyolefin-based resin composition C for the inner layer were prepared. Subsequently, the polyolefin-based resin composition B and the polyolefin-based resin composition C were crosslinked by adding a cross-linking agent and a cross-linking aid and kneading at 170 to 200 ° C. for 1 minute or more to prepare a cross-linked product. ..
Subsequently, using an extrusion molding machine, an insulator was formed on a copper wire having a diameter of 2.0 mm so as to have a thickness of 0.75 to 0.8 mm, and an insulating wire core was produced. A total of three insulated wire cores were manufactured.
The three insulated wire cores produced were arranged in a row, and the inner layer made of the crosslinked body was crosslinked with the crosslinked polyolefin resin composition C so as to cover the three insulated wire cores. The ratios of the coating portion A and the exposed portion B on the flame-retardant layer made of the polyolefin-based resin composition B crosslinked so as to have the thickness shown in 5 and the flame-retardant layer are shown in Tables 1 to 5. A trauma-resistant layer made of the polyolefin-based resin composition A was formed by multi-layer extrusion molding using an extrusion molding machine to produce a flat electric wire / cable shown in FIG. Both the flat electric wire and the flat cable were manufactured so that the end point E at the trauma-resistant layers 18A and 18B was a position between the center point H and the reference point G as shown in FIG. Further, from the intersection of the imaginary wire extending in the direction orthogonal to the arrangement direction of the insulated wire core (thickness direction) from the center position of the insulated wire core closest to the start point D of the insulated wire core and the flame-retardant layer, the above arrangement It was prepared so that the end point E was set within the range of ± 25% in the direction.

The following evaluations were made for each flat electric wire and flat cable.
Room temperature tensile strength: Measured by carrying out the tensile test of JIS C3005, Section 4.16. The standard value is 10 MPa or more specified in JIS C3605, and those satisfying the standard value are described as A, and those not satisfying the standard value are described as B.
Heat deformation: Measured by carrying out the heat deformation of JIS C3005, Section 4.23. JIS C3605 defines 10% or less as the standard value, those satisfying the standard value as A, and those not satisfying the standard value as B.
Flame retardancy: A test was conducted in accordance with JIS C3005, and it was evaluated whether or not the fire was extinguished within 60 seconds specified in JIS C3605. Those that extinguish the fire within 60 seconds are described as A, and those that do not extinguish within 60 seconds are described as B.
Insulation resistance: In accordance with Section 4.7 of JIS C3005, the case of 2500 MΩkm or more specified in JIS C3605 is described as A, and the case of less than 2500 MΩkm is described as B.
Trauma resistance: A CD tube with a length of 8 m (Miraflex CD manufactured by Mirai Kogyo Co., Ltd., inner diameter 28 mm) is bent at 1 m at both ends and installed in a U shape, and a wire passing agent is used at a wire passing speed of 12 m / min. The scratches when the wire was passed without any scratches were visually confirmed, and the case where there was no scratch was described as A, and the case where there was a scratch was described as B.

The results are also shown in Tables 1-5. In the column of comprehensive evaluation, if all the parameters are A, it is described as A, if only one is B, it is described as B, if there are two B, it is described as C, and if there are three B, it is described as D.

From the results shown in Tables 1 to 5, each example having the configuration of the present invention is a flat electric wire / flat cable having excellent linearity and trauma resistance while maintaining flame retardancy and electrical characteristics. Understand.

The present invention is not limited to the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

Here, the features of the above-described embodiments of the flat electric wire and the flat cable according to the present invention are briefly summarized and listed below (1) to (4), respectively.
(1)
A plurality of insulated wire cores (12), an inner layer (14) that covers the plurality of insulated wire cores (12) so as to bundle them, a flame-retardant layer (16) that covers the inner layer (14), and the flame-retardant layer. A flat electric wire / flat cable (10) provided with a trauma-resistant layer (18A, 18B) covering a part of (16).
The plurality of the insulated wire cores (12) are
Arranged in a predetermined arrangement direction according to the specifications of the flat electric wire / flat cable (10),
The flame retardant layer (16) is
The flame-retardant layer (16) is sandwiched between the pair of the trauma-resistant layers (18A, 18B) in the arrangement direction, so that the covering portion covered with the pair of the trauma-resistant layers (18A, 18B) and the covering portion. It has an exposed portion that is not covered by the pair of trauma-resistant layers (18A, 18B).
The trauma-resistant layer (18A, 18B) contains a substance that reduces the insulating property.
Flat electric wire / flat cable (10).
(2)
In the flat electric wire / flat cable (10) described in (1) above,
The trauma-resistant layer (18A, 18B)
The flame-retardant layer (16) is covered so as to spread along the surface of the flame-retardant layer (16) from a start point which is the outermost portion of the flame-retardant layer (16) in the arrangement direction to a predetermined end point. ,
The end point is
It is a reference point that is the closest to the start point among the points where the length between both outer peripheral surfaces of the flame retardant layer (16) is maximum in the thickness direction orthogonal to the arrangement direction, or the arrangement direction. It is a part between the central point which is the central part of the flame retardant layer (16) and the reference point.
Flat electric wire / flat cable (10).
(3)
In the flat electric wire / flat cable (10) described in (2) above,
The flame retardant layer (16)
The length between both outer peripheral surfaces of the flame-retardant layer (16) at the center position of the insulated wire core closest to the starting point of the plurality of insulated wire cores (12) is maximized.
Flat electric wire / flat cable (10).
(4)
In the flat electric wire / flat cable (10) described in any one of (1) to (3) above,
The flame retardant layer (16)
The trauma-resistant layer (18A, 18B) was covered so that the ratio of the surface area of the covering portion to the surface area of the exposed portion was 25:75 to 5:95.
Flat electric wire / flat cable (10).

10, 70 Flat wire / flat cable 12, 74 Insulated wire core 14 Inner layer 16 Flame-retardant layer 73 Insulator 75 Coating layer 18A, 18B Trauma-resistant layer 81 CD tube 122 Conductor 124 Insulator 811 Hollow part A Coating part B Exposed Part C Arrangement direction D Start point E End point F Length between both outer peripheral surfaces of the flame-retardant layer G Reference point H Center point I Center position of the insulated wire core

Claims (3)

A flat type having a plurality of insulated wire cores, an inner layer that covers the plurality of insulated wire cores so as to bundle them, a flame-retardant layer that covers the inner layer, and a traumatic-resistant layer that covers a part of the flame-retardant layer. It is an electric wire / flat cable
The plurality of the insulated wire cores
Arranged in a predetermined arrangement direction according to the specifications of the flat electric wire / flat cable,
The flame-retardant layer is
The flame-retardant layer is sandwiched between the pair of the trauma-resistant layers in the arrangement direction, so that the covering portion covered by the pair of the trauma-resistant layers and the exposed portion not covered by the pair of the trauma-resistant layers. The flame-retardant layer is covered with the trauma-resistant layer so that the ratio of the surface area of the covering portion to the surface area of the exposed portion is 25:75 to 5:95. The thickness of the flame-retardant layer is 0.05 mm or more,
The trauma-resistant layer contains a substance that reduces the insulating property.
Flat electric wire / flat cable. In the flat electric wire / flat cable according to claim 1,
The trauma-resistant layer
The flame-retardant layer is covered so as to spread along the surface of the flame-retardant layer from a start point which is the outermost portion of the flame-retardant layer in the arrangement direction to a predetermined end point.
The end point is
It is a reference point that is the closest to the start point among the points where the length between both outer peripheral surfaces of the flame retardant layer is maximum in the thickness direction orthogonal to the arrangement direction, or the difficulty in the arrangement direction. A point between the central point, which is the central part of the fuel layer, and the reference point.
Flat electric wire / flat cable. In the flat electric wire / flat cable according to claim 2,
The flame-retardant layer
The length between both outer peripheral surfaces of the flame-retardant layer at the center position of the insulated wire core closest to the starting point among the plurality of insulated wire cores is maximized.
Flat electric wire / flat cable.

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