JPH0611227U - Metal laminated sheath cable - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Both the reinforcing action and the earth action of the metal foil 30 can be achieved, and the thickness of the metal foil 30 can be reduced, which contributes to weight reduction. [Structure] A sheathed cable includes a copper cable core, a semiconductive layer made of semiconductor polyethylene coated on the outer peripheral surface of the cable core, a metal laminated tape coated on the outer peripheral surface of the semiconductive layer, and a metal laminated tape. The outer peripheral surface is covered with a resin sheath. The metal laminating tape 3 includes a metal foil 30 made of copper, a porous resin reinforcing layer 32 made of polyethylene terephthalate (PET) laminated on the inner peripheral surface 30a of the metal foil 30 via a first adhesive layer 31, and a metal foil. The second adhesive layer 3 is formed on the outer peripheral surface 30b of 30.
The resin reinforcing layer 34 is made of polyethylene terephthalate and is laminated on the third adhesive layer 35. The third adhesive layer 35 is laminated on the outer peripheral surface of the resin reinforcing layer 34. A large number of circular through holes 38 are dispersedly formed in the porous resin reinforcing layer 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal laminate sheath cable. This sheath cable can be used as a power cable and a communication cable.

[0002]

[Prior art]

 Conventionally, as a metal laminated sheath cable, as shown in FIG. 6, a cable core 100 made of a metal conductor for power supply, and a semiconductive layer 101 made of semiconductor polyethylene covered on the outer peripheral surface of the cable core 100, It is known that the semi-conductive layer 101 is composed of a metal laminated tape 102 which is vertically wrapped around the outer peripheral surface of the semi-conductive layer 101 and a resin sheath 103 which is coated on the outer peripheral surface of the metal laminating tape 102. The metal laminate tape 102 has a function of preventing electric transmission failure due to intrusion of moisture or moisture from the outside, and has a grounding function of releasing the electric charge charged in the semiconductive layer 101 to the outside.

As shown in FIG. 7A, the metal laminate tape 102 is formed of a metal foil 110 of aluminum, copper, lead or the like and an adhesive layer 111 laminated on the outer peripheral surface of the metal foil 110. ing. By the way, the sheath cable may be bent during use. When the metal foil 110 is broken when the sheath cable is bent, the water impermeability and moisture impermeability are reduced. Here, the thicker the metal foil 110, the greater the bending strength and the less likely it is to break. Therefore, in the conventional example shown in FIG. 7A, the metal foil 110 has a thickness of 50 μm or more, but this is disadvantageous in terms of weight reduction of the sheath cable.

Further, as shown in FIG. 7B, a metal laminating tape 102 is provided with a metal foil 120, a resin reinforcing layer 121 made of polyethylene terephthalate (PET) laminated on the outer peripheral surface of the metal foil 120, and a resin. It is also known that the reinforcing layer 121 and the adhesive layer 122 are laminated on the outer peripheral surface of the reinforcing layer 121. In this case, since the metal foil 120 is reinforced by the resin reinforcing layer 121, the thickness of the metal foil 120 can be reduced and the weight reduction of the sheath cable can be expected.

Further, as shown in FIG. 7C, the metal laminating tape 102 is laminated on the metal foil 130, the semiconductive layer 131 laminated on the inner peripheral surface of the metal foil 130, and the outer peripheral surface of the metal foil 130. The adhesive layer 132 is also known.

[0006]

[Problems to be solved by the device]

 By the way, in order to reduce the thickness of the metal foil and reduce the weight of the sheath cable, it is preferable to reinforce the inner peripheral surface of the metal foil with the resin reinforcing layer 121 made of polyethylene terephthalate (PET). However, if the resin reinforcing layer 121 is laminated on the entire inner peripheral surface of the metal foil, the metal foil and the semiconductive layer 101 are partitioned by the resin reinforcing layer 121 having a high electric insulation property, and therefore the grounding action cannot be expected.

The present invention has been made in view of the above circumstances, and an object thereof is to employ a porous resin reinforcing layer to achieve both a reinforcing action and a grounding action of a metal foil, and thereby a metal foil. The purpose is to provide a metal-laminated sheath cable that can reduce the thickness of the cable and contribute to weight reduction and cost reduction.

[0008]

[Means for Solving the Problems]

 The metal laminated sheathed cable of the present invention comprises a cable core made of a metal conductor, a resin coating layer coated on the outer peripheral surface of the cable core, and a spiral or vertical winding wound around the outer peripheral surface of the resin coating layer. It consists of a metal foil and a resin sheath coated on the outer peripheral surface of the metal foil, and is bonded to the metal foil with an adhesive layer between the inner peripheral surface of the metal foil and the outer peripheral surface of the resin coating layer. In addition, the porous resin reinforcing layer having a large number of through holes for facing the metal foil portion to the resin coating layer is laminated.

The metal conductor forming the cable core may be copper-based, aluminum-based, or lead-based. The porous resin reinforcing layer is made of a resin material. Polyethylene terephthalate is the preferred resin material. The thickness of the porous resin-reinforcing layer can be appropriately selected, but is usually 9 to 100 μm. The porous resin reinforcing layer has a large number of through holes penetrating in its thickness direction. The hole diameter of the through hole can be appropriately selected. The planar shape of the through hole may be circular, elliptical, pinhole-shaped, slit-shaped or the like, and may be appropriately selected as necessary. In the porous resin reinforcing layer, through holes having a uniform pore size and shape may be dispersed, or may be mixed and dispersed with through holes having different pore sizes and shapes.

[0010]

[Action]

 The metal foil is reinforced with a porous resin reinforcing layer. Further, since the through hole of the porous resin reinforcing layer faces the metal foil portion, the resin coating layer and the metal portion of the metal foil directly face each other in the through hole portion. Therefore, a grounding operation is achieved in which the electric charges charged in the resin coating layer escape through the metal foil.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the metal laminated sheathed cable has a cable core 1 made of a metal such as copper or aluminum as a metal conductor, and a resin coating layer coated on the outer peripheral surface of the cable core 1. A semiconductive layer 2 made of semiconductor polyethylene, a metal laminating tape 3 vertically wrapped around the outer peripheral surface of the semiconductive layer 2 and covered, and a resin sheath 4 coated on the outer peripheral surface of the metal laminated tape 3. It is configured. Here, the diameter of the cable core 1 is 2 to 3 mm, the diameter of the semiconductive layer 2 is 35 mm, and the diameter of the resin sheath 4 is 50 to 60 mm.

Now, a cross section of the metal laminated tape 3 is shown in FIG. As shown in FIG. 2, the metal laminating tape 3 is made of polyethylene terephthalate (PET) laminated on a metal foil 30 containing copper as a main component and an inner peripheral surface 30a of the metal foil 30 with a first adhesive layer 31 interposed therebetween. The porous resin reinforcing layer 32 made of, a resin reinforcing layer 34 made of polyethylene terephthalate laminated on the outer peripheral surface 30b of the metal foil 30 via the second adhesive layer 33, and laminated on the outer peripheral surface of the resin reinforcing layer 34. And a third adhesive layer 35. The first adhesive layer 31 is a two-component urethane type, the second adhesive layer 33 is a two-component urethane type, and the third adhesive layer 35 is a modified polyester, a modified polyolefin, or a resin such as a mixture of these. Consists of.

A large number of circular through holes 38 are formed dispersedly in the porous resin reinforcing layer 32. The porosity of the porous resin reinforcing layer 32 is set to 10 to 20%. Here, the porosity means {(area of entire through hole 38) / (area of porous resin reinforcing layer 32 assuming that through hole 38 is not formed) × 100%}. In this embodiment, the porous resin reinforcing layer 32 has a thickness of 12 to 30 μm, the first adhesive layer 31 has a thickness of 5 to 10 μm, the metal foil 30 has a thickness of 5 to 30 μm, and the second adhesive layer 33 has a thickness of 5 to 10 μm, the thickness of the resin reinforcing layer 34 is 12 to 50 μm, and the thickness of the third adhesive layer 35 is 30 to 60 μm.

FIG. 3 shows a plan view of the porous resin reinforcing layer 32. The diameter of the through hole 38 is about 3 mm. FIG. 4 shows a portion of the sheathed cable where the metal laminate tape 3 vertically attached is overlapped. As can be understood from FIG. 4, the porous resin reinforcing layer 32 on the inner peripheral side on the one end 3A side of the metal laminate tape 3 and the third adhesive layer 35 on the outer peripheral side on the other end 3B side of the metal laminate tape 3 are melted. I'm wearing it. As a result, the overlapping portion of the one end 3A and the other end 3B is sealed, and the entry of water and moisture from the overlapping portion is prevented.

As described above, in the sheath cable of the conventional example, the thickness of the metal foil is set to 50 μm or more in order to secure bending strength. In this point, however, the metal foil 30 has a thickness of 5 to 30 μm. Since the metal foil 30 is thinned and is reinforced by the porous resin reinforcing layer 32, cracking of the metal foil 30 is suppressed even when the sheath cable is bent with a small radius of curvature. Further, as described above, since the metal foil 30 is as thin as 5 to 30 μm, the weight of the sheath cable can be reduced. In addition, the through hole 38 can reduce the weight of the porous resin reinforcing layer 32 itself.

Further, in this embodiment, since the through hole 38 of the porous resin reinforcing layer 32 faces the metal foil 30, as shown in FIG. 4, the exposed portion 30c of the metal foil 30 and the semiconductive layer 2 are separated from each other. Face to face. Therefore, the charge of the semiconductive layer 2 escapes to the exposed portion 30c of the metal foil 30 and escapes through the metal foil 30, so that a grounding effect is obtained. Here, the characteristic line W1 of FIG. 5 schematically shows the relationship between the porosity of the porous resin reinforcing layer 32 and the bending strength of the porous resin reinforcing layer 32, and the characteristic line W2 of FIG. 5 shows the pores of the porous resin reinforcing layer 32. The relationship between the ratio and the ground effect by the through hole 38 of the porous resin reinforcing layer 32 is shown. As shown by the characteristic line W1 in FIG. 5, the smaller the porosity of the porous resin reinforcing layer 32 is, the larger the bending strength of the porous resin reinforcing layer 32 is, and therefore the effect of reinforcing the metal foil 30 tends to increase. . However, if the porosity of the porous resin reinforcing layer 32 is small, the grounding effect of the porous resin reinforcing layer 32 cannot be expected, as indicated by the characteristic line W2 in FIG. Therefore, in this embodiment, in order to achieve both the reinforcing effect and the earth effect, the porosity of the porous resin reinforcing layer 32 is set to 10 to 30%, particularly about 20%.

[0017]

[Effect of device]

 In the conventional sheath cable, the thickness of the metal foil is set to 50 μm or more in order to secure bending strength. In this regard, according to the metal laminate sheath cable of the present invention, the metal foil is reinforced with the porous resin reinforcing layer. Therefore, even if the sheath cable is bent with a small radius of curvature, cracking of the metal foil is suppressed.

Furthermore, since the metal foil can be reinforced with the porous resin reinforcing layer, the thickness of the metal foil can be reduced, which contributes to weight reduction and cost reduction of the sheath cable. Further, according to the metal laminate sheath cable of the present invention, since the through hole of the porous resin reinforcing layer faces the metal portion of the metal foil, the electric charge charged in the resin coating layer escapes to the metal foil and is passed through the metal foil. You can run away and get the earth effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sheath cable according to an embodiment.

FIG. 2 is an enlarged cross-sectional view of a metal laminate tape.

FIG. 3 is a plan view of a porous resin reinforcing layer.

FIG. 4 is an enlarged cross-sectional view of a portion of the sheathed cable where the metal laminate tape is overlapped.

FIG. 5 is a graph schematically showing the relationship between the porosity of the porous resin reinforcement layer and the bending strength of the porous resin reinforcement layer, and the relationship between the porosity of the porous resin reinforcement layer and the grounding effect of the through holes of the porous resin reinforcement layer. Is.

FIG. 6 is a cross-sectional view of a sheath cable according to a conventional example.

7A to 7C are enlarged cross-sectional views of a metal laminated tape according to a conventional example.

[Explanation of symbols]

In the figure, 1 is a cable core, 2 is a semiconductive layer, 3 is a metal laminated tape, 30 is a metal foil, 31 is a first adhesive layer, 3
2 is a porous resin reinforcing layer, 34 is a resin reinforcing layer, 38 is a through hole,
Reference numeral 4 denotes a resin sheath.

Claims (1)

[Scope of utility model registration request] 1. A cable core made of a metal conductor, a resin coating layer coated on the outer peripheral surface of the cable core, and a metal foil coated on the outer peripheral surface of the resin coating layer in a spiral or vertical direction. And a resin sheath coated on the outer peripheral surface of the metal foil, and between the inner peripheral surface of the metal foil and the outer peripheral surface of the resin coating layer,
A metal laminated sheath cable, which is laminated to the metal foil via an adhesive layer, and is laminated with a porous resin reinforcing layer having a large number of through holes for facing the metal foil portion to the resin coating layer. .