JPH04286809A - Moisture nonpermeable laminated tape for cable - Google Patents

Abstract

PURPOSE:To widen the width and enable the lamination at high speed and cheapen and lighten it and facilitate the handling and further, make it have such excellent moisture intercepting property that in a power cable a cheap insulating pressing winding cloth tape can be used, and that in a WB type optical fiber communication cable it can also be laid in an electromagnetic wave impediment area. CONSTITUTION:Thermoadhesive synthetic resin film layers A1 are provided at one side or both sides each of plastic film laminates B1, B2, and B3 which have deposited films C1 and C2 of at least two or more layers of metallic oxides.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a non-moisture-impermeable laminate tape used as a moisture barrier layer for plastic insulated power cables and optical fiber communication cables, and more specifically to a novel non-moisture-permeable laminate tape that does not use metal foil. Regarding laminated tape.

0002

[Prior Art] When plastics, especially cross-linked polyethylene insulated power cables, are used for a long period of time in a flooded state, such as when buried directly underground, water trees occur in the insulator, resulting in a decrease in insulation performance. It occurs frequently.

As a countermeasure against this problem, a moisture shielding layer made of metal laminate tape is provided between the anticorrosion layer made of polyvinyl chloride, which is the outermost layer of the cable, and the metal shielding layer made of copper rope or copper wire provided inside the anticorrosion layer. things are being done. For example, FIG. 8 is a cross-sectional perspective view showing an example of the structure of such a power cable. In this example, the outer circumference of the conductor 1 includes an inner semiconducting layer 2, an insulator 3, an outer semiconducting layer 4, a metal shielding layer 5, a semiconducting press-wrapped cloth tape 6, a metal laminate tape (moisture barrier layer) 7, and Polyvinyl chloride (anticorrosion layer) 8 is sequentially provided.

[0004] Typically, the construction of such metal laminated tape for power cables is to use a lead or lead alloy foil to block moisture, and one side of the foil has a metal shielding layer of the cable to maintain electrical continuity between the foil and the metal shielding layer of the cable. 101~ as a semiconducting layer for
A semiconductive synthetic resin thin film layer having a volume resistivity of about 106 Ω-cm is provided, and on the other side of the foil there is a reinforcing film layer to increase tensile strength, and on top of that a reinforcing film layer, which serves as a corrosion protection layer for the cable. A heat-adhesive synthetic resin thin film layer is provided to integrate the tape body with polyvinyl chloride by heat-adhesive bonding. Since the metal laminate tape is applied to the cable vertically, the heat-adhesive synthetic resin thin film layer is thermally bonded to the semiconductive synthetic resin thin film layer of the metal laminate tape.

On the other hand, as optical fiber communication cables, WB (waterproof) cables have been put into practical use in recent years. FIG. 9 is a sectional view showing an example of the structure of a relay system WB type optical fiber cable. Structurally, a plurality of optical fiber tape cores 11 are housed in grooves 10a of a grooved polyethylene spacer rod 10 that has a tensile member 9 in the center and a spiral groove on the outer periphery. Water-swellable waterproof tape 12, metal laminate tape (moisture barrier layer) 1 on the outer periphery
3 and a polyethylene corrosion protection layer 14 are provided.

[0006] This metal laminate tape has a thickness of 0.2 mm.
A heat-adhesive synthetic resin thin film layer is provided on one or both sides of the front and rear thick soft aluminum foils to integrate the tape body with the polyethylene that serves as the cable's anti-corrosion layer. This aluminum laminate tape is provided to prevent moisture from entering from the outside.

[0007]

However, these conventional metal laminate tapes used as moisture barrier layers for cables each have the following drawbacks.

Although metal laminated tape for plastic insulated power cables has excellent moisture barrier effects and chemical resistance, it is expensive and difficult to handle, and requires lamination of several layers of various plastic films on narrow lead or lead alloy foil. Because of this, the productivity during lamination is poor, and because it has a complicated structure, it is very expensive, and because it is heavy, it is difficult to handle. Another disadvantage is that an inexpensive insulating cloth tape cannot be used as the tape for wrapping the metal shielding layer of the cable.

On the other hand, a WB provided with a metal laminated tape
Type optical fiber cables have the disadvantage that they cannot be installed in areas where electromagnetic waves are induced because the laminated tape contains metal. Although non-inductive cables have been developed that remove the metal laminated tape to solve this problem, the cables always contain water-swellable waterproof tapes that are extremely sensitive to humidity and moisture, so they cannot be used for long periods of time. The problem is that you have to be concerned about the effects of moisture.

The purpose of the present invention is to change the structure of the metal laminate tape to a form completely different from the conventional one, so that it can be laminated in a wide width and at high speed, is inexpensive, lightweight, and easy to handle, and is inexpensive for power cables. To provide a new moisture-impermeable laminate tape for cables, which has an excellent moisture-blocking effect and can be used with insulating press-wrapped tapes, and can be installed even in areas with electromagnetic interference in WB type optical fiber communication cables.

[0011]

[Means for Solving the Problems] The non-moisture permeable laminate tape for cables of the present invention has a thermoadhesive synthetic resin thin film on one or both sides of a plastic film laminate having at least two or more metal oxide vapor-deposited films. It is characterized by having layers.

The plastic film which is the base material in the moisture-impermeable laminate tape for cables of the present invention is an unstretched plastic film obtained from one or more resins such as polyethylene, polypropylene, polyamide, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate, etc. , a film or sheet with any stretching ratio, as long as it can form a smooth vapor-deposited film of metal oxide on its surface, and may contain additives to impart surface smoothness and stability. Although it is okay to contain additives, they may bleed to the surface under vacuum, reducing the adhesion between the base plastic film and the vapor-deposited film. is preferable, especially mechanical properties, electrical insulation properties,
Heat-resistant polyethylene terephthalate (PET),
Polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), etc. are preferred. Furthermore, if necessary, in order to improve the adhesion of the vapor-deposited film, the plastic film substrate may be subjected to physical treatments such as corona treatment, low-temperature plasma treatment, ion bombardment treatment, etc., as well as chemical and solvent treatments, prior to vapor deposition. Chemical treatment such as anchor treatment may be performed.

In the present invention, since the plastic film having the metal oxide vapor-deposited film is composed of multiple layers, the thickness of the plastic film is 5 to 200 μm, preferably 10 to 75 μm. If it is less than 5 μm, the thickness will be too thin, resulting in poor formability and wrinkles when winding the cable.
If it is 00 μm or more, on the other hand, it will be too stiff and the repulsive force will be large, making it difficult to wrap and bond the cable.

The metal oxide used as the vapor-deposited film of the moisture-impermeable laminate tape for cables of the present invention may be any metal oxide as long as the vapor-deposited film can impart moisture barrier properties, such as silicon oxide, aluminum oxide, etc. , titanium oxide,
Examples include zinc oxide, iron oxide, indium oxide, tin oxide, zirconium oxide, etc., and it is made of at least one of these.

[0015] Methods for depositing metal oxides on plastic film substrates to form a film include general vacuum evaporation methods using resistance heating, high frequency induction heating, and electron beam heating methods in a vacuum system, and bipolar direct current sputtering. (DC), magnetron sputtering such as radio frequency sputtering (RF), ion plating, or as an application of the above method, a reaction in which a vapor deposited film is formed while introducing oxygen and an oxygen-containing inert carrier into a vacuum system. Any method such as chemical vapor deposition, sputtering, ion plating, etc. may be used. In terms of adhesion, ion plating and sputtering are excellent, but the vacuum deposition method is economically most advantageous because it allows high-speed processing of long, rolled objects.

[0016] The thickness of the metal oxide vapor deposition coating is 50 to 300 mm.
0 Å, preferably 100 to 1500 Å. 5
If it is less than 0 Å, the moisture blocking effect will not be sufficient, and the
If the thickness exceeds Å, the film thickness is too thick, and the flexibility of the plastic film base material is impaired, and cracks occur in the film, resulting in variation and deterioration of the moisture barrier effect. The metal oxide may be deposited on either one or both sides of the plastic film substrate.

The plastic film having the vapor-deposited metal oxide film of the moisture-impermeable laminate tape for cables of the present invention is composed of multiple layers. By laminating two or more plastic films with metal oxide vapor-deposited films together using an adhesive, it is possible to significantly reduce the occurrence of scratches and pinholes. This is because the blocking effect is dramatically improved. When bonding multiple layers, the vapor-deposited film surfaces may be laminated with adhesive so that they face each other, or after the layers are laminated so that they do not face each other, a plastic film may be further adhesive-laminated on the exposed vapor-deposited film surface. In the case of a plastic film having a vapor-deposited film on both sides, the plastic film may be adhesively laminated on both sides. At least two vapor-deposited film layers are required, but three or more layers may be used, and the combination thereof can be arbitrarily selected depending on the desired moisture-blocking effect. As mentioned above, it is desirable to protect the vapor-deposited film by laminating a plastic film on the exposed vapor-deposited film surface in order to prevent scratches on the vapor-deposited film surface in the subsequent process. Since a heat-adhesive synthetic resin thin film is formed, the surface of the vapor-deposited film may remain exposed.

[0018] As a method of adhering plastic films having vapor-deposited metal oxide films into multiple layers, an adhesive is applied to one plastic film, and then the other plastic film is placed on top of the other plastic film and then heated and pressed. A method of adhering or a method of adhering under heat and pressure via a heat-adhesive film can be used. Typical adhesives that can be used for bonding are acrylic resin, urethane resin,
Epoxy resins, polyester resins, polyamide resins, phenolic resins, modified polyolefins, ionomers, ethylene-vinyl acetate copolymers, polyvinyl acetals, etc., and single substances or mixtures thereof, etc., may be mentioned, but are not limited to these. In this case, a cable using the non-permeable laminate tape of the present invention can be tested for adhesion between each layer after being immersed in hot water for a long period of time, so an adhesive with excellent water resistance must be selected.

As shown in FIG. 8, the moisture-impermeable laminate tape for cables of the present invention is placed vertically on the presser tape wrapped around the core to heat-seal the lapped portion, and also to heat-seal the wrap portion. In order to be integrated with the extruded anti-corrosive layer by thermal adhesion, a thermally adhesive compound that adheres to the anti-corrosive layer by the heat generated during extrusion of the anti-corrosive layer is applied to one or both sides of a multi-layer plastic film having a vapor-deposited film of metal oxide. A thin resin film layer must be provided.

The heat-adhesive synthetic resin thin film layer may be any material that can be heat-adhered to the front and back sides of the non-permeable laminate tape for cables of the present invention and that can be heat-adhered to the anti-corrosion layer. Since there are two types of materials, polyvinyl chloride and polyethylene, a synthetic resin that has thermal adhesive properties for these must be selected.

Thermal adhesive synthetic resins that can be used for the polyvinyl chloride anti-corrosion layer include polyester resin, semi-rigid vinyl chloride, vinyl chloride-vinyl acetate copolymer, and vinyl chloride-vinyl acetate copolymer.
Vinyl acetate-maleic anhydride terpolymer, ethylene-
Examples include glycidyl methacrylate copolymer, ethylene-vinyl acetate-glycidyl methacrylate terpolymer (for example, Bondfast VC-BC manufactured by Sumitomo Chemical Co., Ltd.), which can be used alone or in combination.

[0022] Thermal adhesive synthetic resins that can be used for the polyethylene anticorrosive layer include polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, and ethylene-acrylic acid. - Acrylic acid ester terpolymer, metal ion crosslinked product of ethylene-methacrylic acid copolymer (ionomer), ethylene-vinyl acetate-methacrylic acid terpolymer, ethylene-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate-vinyl acetate terpolymer , ethylene-vinyl acetate-vinyl alcohol terpolymer, acid graft modified polyethylene, ethylene-
Acid graft modified product of vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene-ethyl acrylate
Examples include maleic anhydride terpolymers and ethylene-ethyl acrylate copolymers containing silane groups, and these may be used alone or in combination.

[0023] As a method for forming a heat-adhesive synthetic resin thin film layer on a multilayer plastic film having a metal oxide vapor-deposited film, a thin film is formed in advance by an inflation method, a T-die method, a calender method, etc. If it is a solvent-soluble resin, it can be laminated using heat adhesive, adhesive laminated using an adhesive, extrusion coating on a plastic film (in some cases at the same time as anchoring), or if it is a solvent-soluble resin. There are methods such as dissolving it in a solvent and applying it directly to a plastic film and drying it, but any method can be used. In this case, the adhesive mentioned above can be used as the adhesive, and the above-mentioned physical treatment or chemical treatment may be applied to improve the adhesion. It is economically advantageous to provide the heat-adhesive synthetic resin thin film layer on one side of a multilayer plastic film having a metal oxide vapor-deposited film, but if sufficient adhesive strength cannot be obtained, it may be provided on both sides. can. The thickness of the heat-adhesive synthetic resin thin film is 5 to 100 μm, preferably 30 to 50 μm. If it is less than 5 μm, the adhesion with the anti-corrosion layer is insufficient;
00 μm or more is economically disadvantageous.

Next, examples of the cross-sectional structure of the moisture-impermeable laminate tape for cables of the present invention will be explained with reference to FIGS. 1 to 6. In the figure, A1 and A2 are heat-adhesive synthetic resin thin film layers (A
1, A2 may be the same or different), B1
, B2, B3 are plastic film layers, C1, C2 are metal oxide vapor deposited films (C1, C2 may be of the same type or different types), D1, D2, D3, D4 are adhesive layers (D1, D2, D3, and D4 may be of the same type or different types).

FIG. 1 shows two plastic films B1,
Metal oxide vapor deposited films C1 and C2 are formed on one smooth side of B2 and are laminated with an adhesive D2 therebetween, and an undeposited plastic film B3 is laminated on the exposed vapor deposited film C2 surface with an adhesive D3, Further, a thermoadhesive synthetic resin thin film layer A1 was provided on one side of the laminate via an adhesive D1. In FIG. 2, heat-adhesive synthetic resin thin film layers A1 and A2 are provided on both sides of the laminate used in FIG. 1 via adhesives D1 and D4.

FIG. 3 shows two plastic films B1,
Metal oxide vapor deposited films C1 and C2 are formed on one smooth side of B2, and the two plastic films are laminated with the vapor deposited film surfaces facing each other via adhesive D2, and further on one side of the laminate. A thermoadhesive synthetic resin thin film layer A1 is provided through an adhesive D1. In FIG. 4, heat-adhesive synthetic resin thin film layers A1 and A2 are provided on both sides of the laminate shown in FIG. 3 via adhesives D1 and D4.

FIG. 5 shows that metal oxide vapor-deposited films C1 and C2 are formed on both surfaces of a plastic film B2, and undeposited plastic films B1 and B3 are laminated on both surfaces with adhesives D2 and D3 interposed therebetween. Adhesive D on one side
A heat-adhesive synthetic resin thin film layer A1 is provided via 1. In FIG. 6, heat-adhesive synthetic resin thin film layers A1 and A2 are provided on both sides of the laminate shown in FIG. 5 via adhesives D1 and D4. In both figures, if the thermoadhesive synthetic resin thin film layer is made of a material that firmly adheres to the plastic film under heat and pressure, the adhesives D1 and D4 are unnecessary.

Although structural examples of the moisture-impermeable laminate tape for cables of the present invention are shown in FIGS. 1 to 6, the present invention is not limited to these structural examples. For example, two-layer, three-layer, or four-layer metal oxides can be formed by double-sided vapor-deposited films, combinations of double-sided vapor-deposited films and single-sided vapor-deposited films, and combinations of double-sided vapor-deposited films and double-sided vapor-deposited films (in some cases, combinations of undeposited films). The moisture-impermeable laminate tape for cables of the present invention can be obtained by providing a heat-adhesive synthetic resin thin film layer on one or both sides of a plastic film laminate having a vapor-deposited film.

[0029]

[Function] As explained in detail above, the moisture-impermeable laminate tape for cables of the present invention uses a plastic film laminate having at least two or more metal oxide vapor-deposited films as a moisture barrier layer. Since the laminate has a heat-adhesive synthetic resin thin film layer on one or both sides that can be thermally bonded to the cable's anti-corrosion layer and whose overlapped area can be thermally bonded, it can be used as a substitute for conventional expensive metal laminate tapes. .

[0030]

Examples (Example 1) Using a vacuum evaporation apparatus, a 12 μm thick polyethylene terephthalate film was set on an unwinding roll, silicon monoxide was used as the evaporation material, and the inside of the tank was evacuated to 0.000009 torr. Next, high-purity oxygen gas is introduced into the tank while being adjusted with a mass flow controller, and silicon monoxide is evaporated by electron beam heating while high-frequency power is applied to create an oxygen plasma atmosphere. A silicon oxide vapor-deposited film was obtained by continuously forming a film with a thickness of 1000 Å.

Next, two vapor-deposited films and one 12 μm thick polyethylene terephthalate film were laminated by a dry lamination method using a two-component polyurethane adhesive.
A film laminate having a silicon oxide vapor deposition film in two tanks having a thickness of 45 μm was obtained.

[0032] Further, on one side of this film laminate, a 50μ
m-thick ethylene-vinyl acetate-glycidyl methacrylate terpolymer (Board First VC manufactured by Sumitomo Chemical Co., Ltd.
-BF) films were laminated by a dry lamination method using a two-component polyurethane adhesive to obtain a moisture-impermeable laminate tape for power cables having the cross-sectional structure shown in FIG.

(Example 2) Thickness of 45 μm obtained in Example 1
A 30 μm thick ethylene-vinyl acetate copolymer acid graft modified product (Admar VE-3 manufactured by Mitsui Petrochemical Industries, Ltd.) was coated on both sides of a film laminate having two layers of silicon oxide vapor deposited film.
00) Films were laminated by a dry lamination method using a two-component polyurethane adhesive to obtain a moisture-impermeable laminate tape for optical fiber communication cables having the cross-sectional structure shown in FIG. 2.

(Comparative Example 1) 15 μm thick lead alloy foil and 25 μm thick lead alloy foil
m-thick polyethylene terephthalate film was laminated by a dry lamination method using a two-component polyurethane adhesive, and a 50 μm-thick ethylene-vinyl acetate-glycidyl methacrylate terpolymer (Bond Fast VC-BF, manufactured by Sumitomo Chemical Industries, Ltd.) film was placed on the film surface. Lamination was carried out using a dry lamination method using a two-component polyurethane adhesive, and then a semiconductive polyester adhesive solution (PES320SB manufactured by Toagosei Kagaku Kogyo Co., Ltd.) was applied to the lead alloy foil surface to a dry adhesion amount of 10 g/cm2. A conventional metal laminate tape for power cables was obtained by coating and heating and drying.

(Comparative Example 2) A 30 μm thick ethylene-vinyl acetate copolymer acid graft modified product (Admar VE- manufactured by Mitsui Petrochemical Industries, Ltd.) was applied to both sides of a 200 μm thick soft aluminum foil.
300) The film is crimped between the nip of a metal roll heated to 120°C and a rubber roll heated to 100°C, heated in an atmosphere of 150°C for 15 seconds, and allowed to cool to form a conventional metal laminate for optical fiber communication cables. Got the tape.

The laminate tapes obtained in Example 1, Comparative Example 1, Example 2, and Comparative Example 2 were subjected to the following tests to examine various properties.

(Test 1. Moisture permeability test) JISZ0208
The moisture permeability of the laminate tapes of Example 1, Comparative Example 1, Example 2, and Comparative Example 2 was measured according to "Moisture Permeability Test Method for Moisture-Proof Packaging Materials (Cup Method)". The test conditions for the cup were a temperature of 40°C, a temperature of 90% RH, and a treatment time of 1 day and 10 days.
20th, 30th. In addition, as a reference sample, 10
The moisture permeability of a 0 μm thick polyethylene terephthalate (PET) film was also measured. The test results are shown in FIG.

(Test 2. Test of adhesion to anti-corrosion layer) Example 1
Comparative Example 1 was examined for adhesive strength to a polyvinyl chloride anticorrosive layer, and Example 2 and Comparative Example 2 were examined for adhesive strength to a polyethylene anticorrosive layer. First, a polyvinyl chloride compound for electric wires was used as the polyvinyl chloride sheet, and a low-density polyethylene for electric wires was used as the polyethylene, and a corrosion-resistant layer sheet having a thickness of 2 mm, a width of 70 mm, and a length of 200 mm was created using a heat press machine.

Next, the heat-adhesive synthetic resin thin film layer of the laminate tape (width 50 mm, length 150 mm) (Example 1 and Comparative Example 1 is Bond First VC-BF film, Example 2 and Comparative Example 2 is Admer VE) -300 film) and the anti-corrosion layer sheet, place the anti-corrosion layer sheet face down on the lower plate of a press that has heated the upper and lower plates to 120°C, leave it for 5 minutes to preheat, and apply a pressure of 5 kg/cm2. After applying pressure for 15 seconds, it was immediately taken out of the press and allowed to cool to room temperature.

[0040] Furthermore, from the laminate of the laminate tape and the anti-corrosion layer sheet that were thermally bonded using a press, a piece with a width of 10 mm and a length of 1
Three 50 mm test pieces were cut, one end of each test piece was forcibly peeled off by hand for about 20 mm, fixed on the upper and lower chucks of a tensile tester, and pulled at a tensile speed of 100 mm/min. The peel force was measured and the average value of the three pieces was determined.

(Test 3. Test of adhesive strength of overlapping parts of laminated tapes) From each of the laminated tapes of Example 1, Comparative Example 1, Example 2, and Comparative Example 2, a width of 50 mm and a length of 150 m was obtained.
Two samples of m were taken. The front and back sides of each sample were placed on top of each other, and the upper and lower plates were placed on the lower plate of a press plate heated to 120°C, left for 5 minutes to preheat, and under a pressure of 5 kg/cm2 15
After applying pressure for a second, it was immediately taken out from the press and allowed to cool to room temperature.

Next, a width of 10 m was obtained from the laminate obtained above.
m, 3 test pieces with a length of 150 mm were taken, one end of the test piece was forcibly peeled off by hand by about 20 mm, and the test piece was fixed on the upper and lower chucks of a tensile tester, and the tensile speed was 100 mm/mi.
The 180 degree peeling force was measured by pulling at n, and the average value of the three pieces was determined.

(Test 4. Measurement of unit weight) From the laminate tapes of Example, Comparative Example 1, Example 2, and Comparative Example 2,
A test piece with a width of 100 mm and a length of 100 mm was taken, and the weight of each test piece was measured using a direct indicator balance, and the average value of the three pieces was calculated and multiplied by 100 to obtain a unit weight.

The measurement results obtained in Tests 2 to 4 above are shown in Table 1 below.

[Table 1]

As is clear from FIG. 7 and Table 1, the non-moisture permeable laminate tape for cables of the present invention has almost the same moisture permeability, anti-corrosion layer adhesion strength, and overlapping part adhesion as compared to conventional metal laminates. It has power and is very light in weight.

[0046]

Effects of the Invention The moisture-impermeable laminate tape for cables of the present invention is a plastic film laminate having at least two or more metal oxide vapor-deposited layers, which has been developed in the packaging material field as a gas barrier film laminate. It is characterized by having a heat-adhesive synthetic resin thin film layer on one or both sides of the laminate, so a wide evaporated plastic film can be produced at high speed, making it cheaper, lighter, and easier to handle than conventional metal laminates. Because the metal oxide vapor-deposited film is insulating, inexpensive insulating wrapping tape can be used for power cables, and WB-type optical fiber communication cables can be laid in areas with electromagnetic interference without the risk of moisture infiltration. It has the same moisture blocking effect,
Its practical value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the structure of a moisture-impermeable laminate tape for cables according to the present invention.

FIG. 2 is a sectional view showing an example of the structure of the moisture-impermeable laminate tape for cables of the present invention.

FIG. 3 is a sectional view showing a structural example of the moisture-impermeable laminate tape for cables of the present invention.

FIG. 4 is a sectional view showing an example of the structure of the moisture-impermeable laminate tape for cables of the present invention.

FIG. 5 is a sectional view showing a structural example of the moisture-impermeable laminate tape for cables of the present invention.

FIG. 6 is a sectional view showing an example of the structure of the moisture-impermeable laminate tape for cables of the present invention.

FIG. 7 is a comparative graph showing the moisture permeability of the moisture-impermeable laminate tape for cables of the present invention and a conventional metal laminate tape.

FIG. 8 is a cross-sectional perspective view showing an example of the structure of a power cable.

FIG. 9 is a cross-sectional view showing an example of the structure of a waterproof optical fiber communication cable.

[Explanation of symbols]

A1, A2 Heat-adhesive synthetic resin thin film layer B1, B2, B
3 Plastic film layers C1, C2 Metal oxide vapor deposited film layers D1, D2, D3, D4 Adhesive layer 1 Conductor 2 Internal semiconductive layer 3 Insulator 4 External semiconductive layer 5 Metal shielding layer 6 Semiconductive press wrapping cloth Tape 7 Moisture barrier layer 8 PVC anticorrosion layer 9 Tensile member 10 Grooved spacer rod 10a Groove 11 Optical fiber tape core 12 Water-swellable waterproof tape 13 Moisture barrier layer 14 Polyethylene anticorrosion layer

Claims (1)

[Claims] 1. A moisture-impermeable laminate tape for cables, characterized in that a thermoadhesive synthetic resin thin film layer is provided on one or both sides of a plastic film laminate having at least two or more metal oxide vapor-deposited films. .