JP7203541B2 - metal laminate tape - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated tape, which is used inside the jacket of a cable and is made by laminating a resin layer and a metal layer.

2. Description of the Related Art Conventionally, a laminate tape composed of a metal layer and a resin layer has been used in communication cables and the like. According to such a laminate tape, it is possible to secure the tensile strength of the cable, and to impart flame retardancy, water impermeability, shielding properties, and the like (for example, Patent Documents 1 to 5).

JP-A-2000-241684 JP-A-2001-143543 JP-A-2001-60418 JP-A-7-122142 JP-A-7-335038

Cables must withstand ambient temperatures. For this reason, the cable is required to withstand environmental temperatures, and the upper limit has generally been 60°C. That is, it is required that the laminate tape does not soften even at 60° C. and that the waterproofness and the like do not deteriorate.

However, due to recent abnormal weather and globalization, the maximum daytime temperature record is about 41°C even in Japan, and even exceeds 50°C overseas. Furthermore, considering the temperature rise due to sunlight, the conventional environmental temperature resistance is not sufficient. If the tape is used at a temperature higher than the ambient temperature, the resin layer of the laminate tape may soften and the adhesion may be peeled off, resulting in a decrease in strength or the occurrence of protrusions at the wrap portion of the laminate tape.

Thus, there is a demand for cables with high environmental temperature resistance that can be used at higher temperatures. It wasn't.

On the other hand, in order to obtain higher environmental temperature resistance, there is a method of increasing the softening temperature of the resin layer. However, simply selecting a material with a higher softening point than conventionally used EVA (ethylene-vinyl acetate copolymer) in order to raise the softening temperature would require processing at a higher temperature than before when manufacturing laminated tape. Therefore, it was necessary to modify the equipment to one with high heat resistance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a laminate tape for cables that is excellent in manufacturability, has a high softening temperature, and has high environmental temperature resistance.

In order to achieve the above object, the present invention provides a laminate tape for use inside a jacket of a cable, comprising a laminate of a resin layer and a metal layer, wherein the resin layer is made of polypropylene as a base resin. , maleic acid is added at 0.1 mass% or more and 1 mass% or less, the softening temperature is 75 ° C. or more, and the melt flow rate specified by JIS K6922-2 is 0.2 g / 10 min or more and 20 g / 10 min or less. It is a laminate tape characterized by being

More preferably, 0.5% by mass or more and 1% by mass or less of maleic acid is added to the base resin.

Preferably, the metal layer is aluminum, stainless steel, copper or steel.

It is desirable that the Shore D hardness of the resin layer is 45 or more.

It is desirable that the tensile strength at break is 10 MPa or more.

It is desirable that the yield point stress of the laminate tape is 5 MPa or more.
It is desirable that the thickness of the laminate tape is 0.05 mm to 0.2 mm.
It is desirable that the thickness of the resin layer is 0.03 mm to 0.40 mm.
A thickness ratio of the resin layer and the metal layer is preferably 0.3≦the resin layer/the metal layer≦1.2.

According to the present invention, by adding 0.1% by mass or more and 1% by mass or less of maleic acid to polypropylene , a softening temperature of 75 ° C. or more can be secured, and high environmental temperature resistance can be obtained. At the same time, the melt flow rate defined by JIS K6922-2 is 0.2 g/10 min or more and 20 g/10 min or less.

In addition, it is preferable to add 0.5% by mass or more and 1% by mass or less of maleic acid in order to further increase the adhesive strength.

Also, if the metal layer is aluminum, stainless steel, copper or steel, it can be handled in the same way as a conventional laminated tape.

Moreover, if the Shore D hardness of the resin layer is 45 or more, sufficient rigidity can be obtained when used for a cable.

Further, if the tensile strength at break is 10 MPa or more, sufficient tensile strength can be obtained when used for a cable.

Similarly, if the yield point stress is 5 MPa or more, sufficient durability can be ensured.

ADVANTAGE OF THE INVENTION According to this invention, the laminated tape for cables which is excellent in manufacturability, has a high softening temperature, and has high environmental temperature resistance can be provided.

FIG. 2 is a cross-sectional view of the laminate tape 1; 3 is a perspective view of a metallic cable 30a using the laminate tape 1. FIG. FIG. 2 is a cross-sectional view of a metallic cable 30a using the laminate tape 1; FIG. 4 is an enlarged view of portion B in FIG. 3 ; 4 is a perspective view of a metallic cable 30b using the laminate tape 1. FIG. FIG. 3 is a cross-sectional view of a metallic cable 30c using the laminate tape 1; FIG. 3 is a cross-sectional view of a metallic cable 30d using the laminate tape 1; FIG. 2 is a cross-sectional view of an optical cable 40 using the laminate tape 1;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a laminate tape 1. FIG. The laminate tape 1 has a resin layer 5 and a metal layer 3 laminated on the resin layer 5 . The laminate tape 1 is wound around the inside of the jacket of the cable.

The metal layer 3 of the laminate tape 1 is not particularly limited, but aluminum (including aluminum alloys), stainless steel, copper (including copper alloys), or steel can be applied. An adhesive layer (not shown) may be provided on the surface of the laminate tape 1 (the surface of the metal layer 3). Moreover, the resin layer 5 may be laminated on both sides of the metal layer 3 .

The base resin of the resin layer 5 of the laminate tape 1 is polypropylene . By applying polypropylene , the softening temperature can be 75° C. or higher. The softening temperature of the resin can be measured according to JIS K7196 (2012), for example.

The polypropylene constituting the resin layer 5 is krafted by adding 0.1% by mass or more and 1% by mass or less of maleic acid. More preferably, 0.5% by mass or more and 1% by mass or less of maleic acid is added to the polypropylene constituting the resin layer 5 . By doing so, the melt flow rate of the polypropylene constituting the resin layer 5 can be set to 0.2 g/10 min or more and 20 g/10 min or less as defined by JIS K6922-2. More desirably, the melt flow rate of the polypropylene forming the resin layer 5 is 1.0 g/10 min or more and 15 g/10 min or less.

If the melt flow rate is too low, manufacturability will deteriorate. On the other hand, if the melt flow rate is too high, there is a possibility that a problem may occur in shape retention during production. The melt flow rate can be measured according to JIS K7210-1 (2014), for example.

The Shore D hardness of the resin layer 5 is desirably 45 or more. This is because if the Shore D hardness of the resin layer 5 is too low, the rigidity of the cable becomes low when used for the cable.

The laminate tape 1 preferably has a tensile strength at break of 10 MPa or more as a whole. By increasing the tensile breaking strength of the laminate tape 1, it is possible to increase the tensile strength of the cable when used for the cable.

Moreover, it is desirable that the laminate tape 1 has a yield point stress of 5 MPa or more. By increasing the yield point stress of the laminate tape 1, the durability of the cable can be enhanced when the laminate tape 1 is used for the cable.

Although the thickness of the laminate tape 1 is not particularly limited, it is preferably 0.05 mm to 0.2 mm, for example. If the thickness of the laminate tape 1 is made thinner than this, the strength of the cable deteriorates. If the laminate tape 1 is made thicker than this, the strength increases, but new problems such as weight reduction arise.

Moreover, it is desirable that the thickness of the resin layer 5 is 0.03 mm to 0.40 mm. If the thickness of the resin layer 5 is made thinner than this, the adhesiveness is improved, but the production yield is deteriorated. Conversely, if the thickness of the resin layer 5 is increased more than this, a new problem such as deterioration of the environmental resistance of the cable arises.

The ratio of the thicknesses of the resin layer 5 and the metal layer 3 is preferably 0.3≦resin layer 5/metal layer 3≦1.2. By doing so, it is possible to obtain the effect of preventing a decrease in manufacturing variations of the laminate tape. Moreover, it is desirable that the peel strength between the metal layer 3 and the resin layer 5 is 2.9 N/mm ² or more.

Next, an example of a cable using the laminate tape 1 will be described. FIG. 2 is a perspective view showing the metallic cable 30a, and FIG. 3 is a sectional view.

The metallic cable 30a is mainly composed of a plurality of coated conductor wires 31, a pressing winding tape 37, a laminate tape 1, an outer covering 17, and the like, in this order from the inside. The coated conductor 31 is composed of a conductor and an insulating coating covering the conductor.

The conductor of the coated wire 31 is made of aluminum or copper, for example, and a single wire as shown can be used. An insulating coating is provided on the outer circumference of the conductor. The insulating coating is formed over substantially the entire length of the conductor. The insulating coating is made of insulating resin. The coated conductor 31 including the conductor and the insulating coating may be used as a single wire, but two wires may be twisted to form a pair wire, or four wires may be twisted to form a quad wire.

A plurality of coated conductor wires 31 are bundled by a loose winding string 33 . A pressing winding tape 37 is further wrapped around the outer peripheries of the plurality of bundles of the plurality of coated conductor wires 31 . In the metallic cable 30a, the plurality of covered conductor wires 31 bundled with the pressing winding tape 37 are used as the cable core portion 25. As shown in FIG.

Here, in forming the cable core portion 25, a method of twisting pair wires and quad wires into a unit and further twisting the unit to form a unit, and a method of twisting a single core wire, a pair wire, and a quad wire in the central layer There are various methods such as twisting single-core wires, pair wires, and quad wires with the first and second layers on the upper layer.

The laminate tape 1 is wound around the outer periphery of the pressing tape 37 . The laminate tape 1 is wound vertically so that both ends in the width direction are wrapped in the circumferential direction. That is, the laminate tape 1 is wound around the outer circumference of the cable core portion 25 so that the axial direction of the cable core portion 25 and the longitudinal direction of the laminate tape 1 are aligned, and the wrap portions 23 at both ends of the laminate tape 1 are formed in a substantially linear shape. be done.

A jacket 17 is provided on the outer circumference of the laminate tape 1 . The jacket 17 is provided so as to cover the outer circumference of the laminate tape 1 . That is, the laminate tape 1 wound around the outer circumference of the cable core portion 25 is arranged inside the jacket 17 , and the jacket 17 is provided on the outermost circumference of the cable core portion 25 .

The jacket 17 is made of resin, and for example, resin such as polyolefin to which carbon black or the like is added can be applied.

In the metallic cable 30a, the laminate tape 1 functions as a moisture permeation prevention layer. That is, a part of the resin layer 5 of the laminate tape 1 adheres both ends of the laminate tape 1 in the width direction, and the laminate tape 1 and the jacket 17 are adhered to each other, thereby restricting the entry path of humidity. It is also possible to eliminate the resin layer 5 only at both ends in the width direction of the laminate tape 1 and to allow the metal layers 3 to conduct at both ends in the width direction, thereby using the entire laminate tape as a conductor as a metal pipe.

Note that the jacket 17 may have two or more layers instead of one layer.

A tear string 35 is arranged between the laminate tape 1 and the cable core portion 25 of the metallic cable 30a. By pulling out the tear string 35, the laminated tape 1 and the jacket 17 can be torn, and the covered conductor wire 31 inside can be taken out.

In the metallic cable 30a, the number of coated conductors 31 constituting the cable core portion 25 and the number of bundles are not limited to the illustrated example. Furthermore, it may be a composite cable in which optical fibers or the like are arranged.

As described above, the laminate tape 1 has the wrap portion 23 . FIG. 4 is an enlarged view of the B portion in FIG. 3 and an enlarged view of the wrap portion 23. As shown in FIG. The laminate tape 1 is wound around the outer periphery of the cable core portion 25 with the resin layer 5 facing outward. That is, the jacket 17 and the resin layer 5 are bonded together. Also, in the wrap portion 23, the metal layer 3 on the outer end of the wrap portion 23 and the resin layer 5 on the inner end are bonded.

Note that the laminate tape 1 does not have to be provided with an adhesive layer. In this case, at the wrap portion 23, the ends of the laminate tape 1 simply overlap each other, and some deviation is allowed. Also, the resin layer 5 and the jacket 17 may simply be in contact with each other and may not be bonded together.

Here, it is desirable that the wrap length (B in the drawing) of the wrap portion 23 in the circumferential direction is 1 mm or more and 1.5 times or less the outer diameter of the metallic cable 30a. If the wrap length is too short, the water impermeability may be deteriorated due to displacement of the wrap portion 23 when the metallic cable 30a is bent. On the other hand, if the wrap length is too long, the moisture permeation preventive layer will become thick and the flexibility will be affected.

Next, a method for manufacturing the metallic cable 30a will be described. A coated conductor 31 is formed by forming an insulating coating on the outer periphery of the conductor, for example, by extrusion. Next, the coated conductors 31 are twisted by a twisting assembly machine to twist paired wires, quad wires, units and the same, or twist multiple layers of paired wires or quad wires, and bundle them with a loose winding string 33 as necessary. , a plurality of bundles are collectively wound with a pressing winding tape 37 to form a cable core portion 25. - 特許庁A laminate tape 1 obtained by laminating a resin layer 5 and a metal layer 3 or the like in advance is supplied, and a forming machine or the like is used to form a vertical winding around the outer periphery of a press winding tape 37 (cable core portion 25) to form a moisture permeation prevention layer. be done.

A jacket 17 is extruded and integrated with the perimeter of the moisture permeable layer formed by the laminate tape 1 . Extrusion and forming may be a series of simultaneous processes. The metallic cable 30a is manufactured by the above.

As described above, according to the present embodiment, since the softening temperature of the resin layer 5 of the laminate tape 1 is 75° C. or higher, it is possible to secure a sufficient environmental temperature resistance even against recent increases in temperature.

In addition, even if the softening temperature of the resin layer 5 is increased, the melt flow rate can be kept at a predetermined level or higher, so the productivity is also excellent.

Next, a second embodiment will be described. FIG. 5 is a perspective view showing the metallic cable 30b. In the following description, the same components as those of the metallic cable 30a are denoted by the same reference numerals as in FIGS. 1 to 4, and overlapping descriptions are omitted.

The metallic cable 30b has substantially the same configuration as the metallic cable 30a, but differs in that the laminate tape 1 is corrugated. The corrugated shape of the laminate tape 1 is formed such that peaks and valleys are repeated in the longitudinal direction of the cable core portion 25, and the peaks and valleys are continuous in the circumferential direction. It may be made smooth without applying a corrugated shape.

The corrugation process of the laminate tape 1 is performed when the metal layer 3 of the laminate tape 1 is made of stainless steel, for example. When the metal layer 3 of the laminate tape 1 is made of aluminum, the laminate tape 1 may be wound around the outer periphery of the cable core portion without being corrugated like the metallic cable 30a.

The corrugated shape of the laminate tape 1 may be performed when the laminate tape 1 is manufactured, and the corrugated laminate tape 1 may be sent and wound around the outer periphery of the cable core portion 25, or when the laminate tape 1 is formed. In addition, corrugation may be performed at the same time.

In this manner, the laminate tape 1 can be used after being corrugated as necessary.

Next, a third embodiment will be described. FIG. 6 is a cross-sectional view showing the metallic cable 30c. The metallic cable 30c has substantially the same configuration as the metallic cable 30a, but differs in that the laminate tape 1 is spirally wound instead of longitudinally wound.

In the spiral winding, one sheet of the laminate tape 1 may be used and wound so that one end in the width direction of the laminate tape 1 overlaps the opposite end in the width direction of the laminate tape 1 one round before. In addition, one sheet of the laminate tape 1 is spirally wound at intervals, and one or both ends of the other laminate tape 1 in the width direction are overlapped with the previously wound laminate tape 1 so as to cover the cable with a large number of sheets. It can also be wrapped in a spiral winding. Thus, the laminate tape 1 may be spirally wound instead of longitudinally wound.

Next, a fourth embodiment will be described. FIG. 7 is a cross-sectional view showing the metallic cable 30d. Metallic cable 30 d has an inner sheath 39 . Similar to the metallic cables 30a, 30b, and 30c, the metallic cable 30d has a plurality of covered conductor wires 31 bundled with a loosely wound string 33, and a pressing winding tape 37 is wound around the outer periphery of the plurality of bundles. In addition, the laminate tape 1 forms a wrap portion 23 around the outer periphery of the pressure winding tape 37 and is longitudinally wound. As described above, the laminate tape 1 may be spirally wound, but in the following description, an example in which the laminate tape 1 is longitudinally wound will be described.

An internal sheath 39 is formed around the outer periphery of the laminate tape 1 in the metallic cable 30d. The inner sheath 39 is molded, for example by extrusion. A laminate tape 1 is further wound around the inner sheath 39 .

A jacket 17 is provided on the outer circumference of the outer laminate tape 1 and on the outermost circumference of the metallic cable 30d. That is, the laminate tape 1 is arranged inside the jacket 17 . The jacket 17 is provided so as to cover the outer periphery of the laminate tape 1 and adheres to the resin layer 5 of the laminate tape 1 . That is, the metallic cable 30 d has two resin layers, the jacket 17 and the inner sheath 39 , and the laminate tape 1 is wrapped around the inside of each of the jacket 17 and the inner sheath 39 .

Thus, when the inner sheath 39 is provided, tearing strings 35a and 35b are provided between the inner peripheral side laminate tape 1 and the pressure winding tape 37 and between the inner peripheral side laminate tape 1 and the outer peripheral side laminate tape 1, respectively. is placed. By doing so, the inner sheath 39 can be exposed by tearing the outer laminate tape 1 and the jacket 17 by pulling out the tear string 35b. Further, by pulling out the tear string 35a, the inner laminate tape 1 and the inner sheath 39 can be torn, and the coated conductor wire 31 inside can be taken out.

In this embodiment, the cable core portion 25 is formed up to the pressing tape 37 , but the cable core portion 25 may include the inner sheath 39 . In either case, the laminate tape 1 is wound around the outer periphery of the cable core. It should be noted that the inside of the inner sheath 39 may be made of only the resin without providing the laminate tape 1 .

By applying the laminate tape 1 to the metallic cables 30a, 30b, 30c, and 30d in this manner, water impermeability can be ensured, and a metallic cable excellent in environmental resistance can be obtained.

Further, like the metallic cable 30d, the inner sheath 39 is provided and the tear strings 35a and 35b are provided at respective parts, so that the outer cover 17 and the like and the inner sheath 39 and the like can be torn separately. is easy, and breakage of the tear string can be suppressed.

Next, a fifth embodiment will be described. FIG. 8 is a cross-sectional view showing the optical cable 40. As shown in FIG. The optical cable 40 is composed of a tension member 41, a spacer 43, an optical fiber tape core wire 47, an inner sheath 39, a laminate tape 1, an outer jacket 17, and the like.

The spacer 43 is made of flexible resin. A plurality of grooves 45 are provided on the outer periphery of the spacer 43 , and the grooves 45 are formed in a spiral shape in one direction with respect to the longitudinal direction of the spacer 43 , or in both directions in an SZ shape repeatedly and continuously. A tension member 41 is provided in the center of the spacer 43 . A plurality of optical fiber tape core wires 47 are accommodated in the grooves 45 . The optical fiber tape core wire 47 is, for example, an intermittent optical fiber tape core wire in which optical fibers adjacent to each other in the longitudinal direction are intermittently bonded.

A pressure winding tape 49 is wound around the outer circumference of the spacer 43 . An inner sheath 39 is provided around the outer circumference of the pressing tape 49 . The inner sheath 39 is formed, for example, by extrusion. A protective tape 53 is wrapped around the inner sheath 39 . The inner sheath 39 and the protective tape 53 are made of resin, and the inner sheath 39 and the protective tape 53 are not adhered.

The laminate tape 1 is wound around the outer periphery of the protective tape 53 . As described above, the laminate tape 1 is longitudinally wound with the resin layer 5 as the outer periphery and the wrap portion 23 provided.

In the present embodiment, the cable core portion 25 is formed up to the pressing tape 49 , but the cable core portion may include the inner sheath 39 and the protective tape 53 . As described above, in either case, the laminate tape 1 is wound around the outer circumference of the cable core. That is, in the present invention, the fact that the laminate tape 1 is wound around the outer periphery of the cable core part includes the provision of another structure such as the protective tape 53 between the cable core part and the laminate tape 1 .

A jacket 17 is provided on the outer circumference of the laminate tape 1 and on the outermost circumference of the optical cable 40 . That is, the laminate tape 1 is arranged inside the jacket 17 . The jacket 17 is provided so as to cover the outer periphery of the laminate tape 1 and adheres to the resin layer 5 of the laminate tape 1 .

Also in the optical cable 40, a tear string is arranged between the laminate tape 1 and the cable core portion. In the illustrated example, a tearing string 35 a is arranged between the pressing tape 49 and the inner sheath 39 , and a tearing string 35 b is arranged between the protective tape 53 and the laminate tape 1 . By pulling out the tearing string 35b, the laminate tape 1 and the jacket 17 can be torn to expose the internal protective tape 53 and the like. Further, by pulling out the tear string 35a, the inner sheath 39 and the protective tape 53 can be torn, and the optical fiber tape core wire 47 inside can be taken out.

In the optical cable 40, the shape, the number and depth of the grooves 45, and the configuration of the optical fiber ribbon 47 and the like are not limited to the illustrated example. Also, the inner sheath 39 and the protective tape 53 are not necessarily required.

By applying the laminate tape 1 to the optical cable 40 in this manner, it is possible to obtain an optical cable that is excellent in environmental resistance as well as ensuring water impermeability. It is also possible to form the resin layer 5 so that the wrap portion 23 of the laminate tape 1 can easily adhere to it, thereby further improving the water impermeability.

In addition, by wrapping the protective tape 53 between the tearing string 35b and the inner sheath 39, the tearing string 35b can be prevented from biting into or adhering to the inner sheath 39, making it difficult to pull it out. can be done.

Thus, the laminate tape 1 can be suitably applied to various cables.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not influenced by the above-described embodiments. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. be understood to belong to

For example, it goes without saying that each configuration of each embodiment described above can be combined with each other.

Reference Signs List 1 Laminated tape 3 Metal layer 5 Resin layer 17 Jacket 23 Wrap portion 25 Cable core portions 30a, 30b, 30c, 30d Metallic cable 31 …… Covered conductor 33 …… Roughly wound strings 35, 35a, 35b …… Tear string 37 …… Press winding tape 39 …… Internal sheath 40 …… Optical cable 41 …… Tension member 43 ………… Spacer 45 --- Groove 47 --- Optical fiber tape core wire 49 --- Press winding tape 53 --- Protective tape

Claims (9)

A laminated tape for use inside a cable jacket, comprising:
A resin layer and a metal layer are laminated,
The resin layer has a base resin of polypropylene , maleic acid added in an amount of 0.1% by mass or more and 1% by mass or less, a softening temperature of 75° C. or more, and is defined by JIS K6922-2. A laminate tape having a melt flow rate of 0.2 g/10 min or more and 20 g/10 min or less. 2. The laminate tape according to claim 1 , wherein 0.5% by mass or more and 1% by mass or less of maleic acid is added to the base resin. 3. The laminate tape according to claim 1 , wherein said metal layer is made of aluminum, stainless steel, copper or steel. 4. The laminate tape according to claim 1 , wherein the resin layer has a Shore D hardness of 45 or more. 5. The laminate tape according to any one of claims 1 to 4 , which has a tensile strength at break of 10 MPa or more. 6. The laminate tape according to any one of claims 1 to 5 , having a stress at yield point of 5 MPa or more. 7. The laminate tape according to claim 1 , wherein the laminate tape has a thickness of 0.05 mm to 0.2 mm. 8. The laminate tape according to claim 1 , wherein the resin layer has a thickness of 0.03 mm to 0.40 mm. 9. The laminate according to any one of claims 1 to 8, wherein the ratio of the thicknesses of the resin layer and the metal layer is 0.3≤the resin layer/the metal layer≤1.2. tape.

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