JPH0674553B2 - Colored polyethylene coated cable - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a colored polyethylene-coated cable, which is used as a cable for a suspended structure of a building and a civil engineering structure.

(Prior Art) A coated cable (hereinafter, simply referred to as a cable) generally used as a cable for a hanging structure used in construction and civil engineering structures has a diameter of 7 mm as shown in the cross-sectional view of FIG. 265 galvanized steel wires (1a) are bundled so as to have a densest cross section as shown in the figure to form a hard steel wire bundle (1) as a core wire. In general, the coating material (2) is coated.

Polyethylene resin itself is vulnerable to ultraviolet rays, and when used as a cable covering material for permanent structures used outdoors, it contains carbon black of 2 to 3% and ultraviolet rays of 2%.
~ 3% contained to absorb ultraviolet rays. Polyethylene containing 2 to 3% of carbon black has semi-permanent weather resistance, but its hue is black.

The cable is used for a suspended structure such as a cable-stayed bridge, but functional beauty (aesthetics) is one of the elements in which the suspended structure is generally adopted. Therefore, it is necessary for the above-mentioned cable to have an aesthetic appearance adapted to the landscape.

As a means to meet this demand, colored cables are used on the surface of the cables.

As the colored cable, there is used, for example, a structure in which a colored tape made of a fluororesin film is wound around the peripheral surface of the cable, or a product obtained by extruding and covering a fluororesin having a thickness of 2 mm or more. The winding work of the colored tape is performed at the site where the cable is laid.

As described above, conventional cables are used with colored tape wrapped around the outer peripheral surface or with fluororesin coating, and currently satisfy the aesthetic requirements to some extent. There are problems in terms of means and economy.

(Problems to be Solved by the Invention) As described above, in a coated cable used as a cable for a hanging structure in a building and a civil engineering structure, an aesthetic appearance is required corresponding to a structure to be laid. But,
With this type of conventional colored cable, there was no conventional technique for directly or effectively coating or coating polyethylene with sufficient mechanical properties, so a colored tape composed of a fluororesin film was applied to the surface of the cable. There was only a cable wound around the cable, and its construction could only be done on-site, making factory construction difficult.

The reason for this is that it is possible to wind the above colored tape around the outer peripheral surface of the cable in the factory, but when it is wound around the winding drum for transportation, the colored tape is separated from the predetermined sticking position to cause a deviation, and further, When the tape is unwound from the take-up drum, the tape becomes turbulent and breaks, making it unusable for common use.

Since such turbulence and damage extend over the entire length, repairing is done by removing the tape that has already been applied and rewinding it at the site, and there is no point in using it as factory construction.

For the above reasons, it was considered difficult to carry out the coloring work for this type of cable at the factory.

On the other hand, in the case of on-site construction, since the applied area is usually a high place, it is not possible to use an automated device for tape winding work that is complicated and large, so it is usually used for large-scale work. It has problems such as the need to set up scaffolding, the extended process and the need to rewind tape some years later.

Further, in the appearance of the cable wound with the colored tape, regular seams are clearly visible, and therefore, there is a problem that it is unfavorable in terms of appearance.

In short, the cables used in the past are not efficient in construction due to the fact that coloring work is difficult to construct at the factory and automation at the site construction is also difficult, and the appearance of the outer circumference of the cable is also satisfactory. It wasn't as good as it was.

The present invention has been invented in view of the above-mentioned viewpoint, and an object of the invention is to enable a factory construction of a coloring work on a cable, and further, a colored polyethylene coating which can satisfy the aesthetics and economical efficiency of the outer peripheral surface of the cable. To provide the cable.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a structure of a cable in which a hard steel wire bundle is arranged in a core wire, and the surface thereof is covered with a base material made of polyethylene containing carbon black. At the same time, the surface of the base material is coated with a colored layer composed of two layers, a base layer composed of a polyethylene component and a primer component having a polar group, and a coating layer.

(Function) According to the cable of the present invention, instead of winding the coloring tape around the surface of the base material, a constitution in which a coloring layer composed of a base layer (hereinafter referred to as a primer layer) and a coating layer is coated is adopted. As a result, the cable can be colored on site or in the factory using painting equipment.

In particular, construction in a factory that is not affected by weather conditions and has good quality control is superior in terms of quality and economy.

Also, existing technology can be used for the technique of applying the primer layer, and a smooth surface of the cable itself can be obtained.

The primer layer in the cable of the present invention contains a polyethylene component, and the adhesive strength between the base material and the coating layer is 50 kg / cm ²
As described above, a coating material composed of polyethylene, rubber and a primer component (a material having a polar group) having a thickness of 10 to 30 μm, which has a sufficient elongation property, is adopted, and the coating layer is a poly as a base material, preferably For example, a fluorine coating containing titanium oxide as a pigment may be used. For example, a fluorine coating which is a pigment containing titanium oxide is formed with a thickness of 30 μm or more, which is necessary for coloring. Became.

The coloring layer composed of the primer layer and the coating layer as a whole has characteristics of compressive strength of 30 kg / cm ² or more and elongation of 5% or more.

The color of the colored layer in the present invention can be changed to a desired colored layer by substituting the pigment of the paint, and there is no problem even with the means other than the automatic coating machine.

(Example) Hereinafter, one example concerning the cable of the present invention will be described in detail.

First, the structure of the cable of the present invention will be described with reference to the cross-sectional view of FIG. 1. The galvanized steel wire (1a) 265 having a diameter of 7 mm
As shown in the figure, the hard steel wire bundle (1) is formed by bundling the books so that the cross section has the densest cross section, and the hard steel wire bundle (1) has a thickness of 8.5 m on the outer circumference.
A base material (2) having a coating material of black high-density polyethylene containing 2.2% of m carbon black is applied.

Then, commercially available paint (for example) as a primer layer (3), 10 μm of China Paint Co., Ltd .: Thermotac E300
Although it is formed to a thickness of m or more, in this embodiment, it is applied to an extent that a thickness of 15 μm can be formed in consideration of coating unevenness,
A primer layer (3) is adhered thereto by a baking treatment under the processing conditions of a temperature of 180 ° C. and a baking time of 3 minutes in a far infrared furnace described later.

Reference numeral (4) is a coating layer, which has a compressive strength of 30 kg / cm ² or more and an elongation of 5% or more, and is a pigment containing titanium oxide capable of blocking ultraviolet rays that deteriorate the polyethylene used as the base material (2). A commercially available (for example, China Top Co., Ltd .: Thermotop E100) fluorine paint having a thickness of 30 μm or more necessary for coloring, and in this embodiment, 50 μm in consideration of coating unevenness.
Configured to the thickness of. Then, similarly to the primer layer (3), a rapid drying process is performed in a far-infrared furnace at a temperature of 120 ° C. for a baking time of 6 minutes to form a coating layer (4) adhered to the primer layer. To do.

In this way, the colored layer is formed on the cable body,
In this embodiment, a white colored layer is used.

The cable structure of the present embodiment is as described above, and the construction process of the colored layer including the primer layer and the coating layer will be described with reference to the schematic cross-sectional view of FIG.

First, 265 galvanized steel wires (1a) having a diameter of 7 mm are bundled by a usual forming means so as to have a densest cross section as shown above to form a hard steel wire bundle (1), and the hard steel wire bundle (1) is formed. The outer periphery of the is coated with a high-density polyethylene substrate (2) containing 2.2% of carbon black having a thickness of 8.5 mm (hereinafter referred to as a cable body). A cleaning device equipped with an annular cleaning water spray pipe (10a) for spraying cleaning water for cleaning the surface of this cable body and a cleaning water drainer (10b) for draining the surface of the cable body after cleaning ( Pass it through 10) and wash and drain the cable body surface as a pretreatment for spray painting.

Then, it is transferred into the automatic coating machine (11), and spray coating is performed to form the primer layer (3) on the surface of the cable body.

The automatic coating machine (11) has a deodorizing device (11a) and a paint mist removing device (11b) installed in a hood (11c) having an opening communicating with the atmosphere, and a spray for spraying paint into the main body ( 11b) is provided in a ring. The annular spray (11d) has a mixer and regulator (12a),
It is connected to a paint supply device (12) composed of a compressor (12b) and a paint tank and a supply device (12c), and is controlled so that an appropriate amount of desired paint is supplied.

If the primer layer (3) is formed on the cable body while passing through the automatic coating machine (11) configured in this way, the hot air circulating furnace (13) connected to the hot air generator (13a) in the next step
To remove the thinner component in the paint sprayed in the hot air circulating furnace (13).

In the removal of the thinner component in the paint, when the thinner component remains, the baking coating film in the far infrared radiant furnace in the next step expands and partially swells. Therefore, this treatment is important for the quality of the cable.

After that, a baking treatment is performed in the far-infrared radiation furnace (14) at a predetermined temperature and for a predetermined time, and finally, it is cooled by a cooling device (15) to form a primer layer (3).

The primer layer (3) is formed as described above,
The coating layer (4) is formed by changing the coating material from the above-mentioned formation of the primer layer (3) and passing the cable body on which the primer layer (3) is formed again through the equipment.

Quality of the colored layer When the quality of the coating film was inspected on the cable formed by the above-mentioned construction, the adhesiveness (JIS-K-5400) ・ ・ ・ 25/25 Adhesive force (shear adhesive strength) ‥ 86kg / cm ² Elongation ・ ・ ・ 6% Compressive strength ‥ 100kg / cm ² Weather resistance (JIS-K-5400) ・ ・ ・ 3625hrs no abnormality Water resistance (immersion in normal temperature tap water) ・ ・ ・ No abnormality after 349 days Salt spray (JIS -K-5400) No abnormalities at 7416hrs Reel winding / rewinding test: No abnormalities were obtained when the barrel diameter was 3.2m (D / d = 20).

(Effect of the invention) The present invention provides a coated cable used as a cable for a suspended structure, in which a hard steel wire bundle is arranged on a core wire, and the surface thereof is coated with a base material made of polyethylene containing carbon black and the base material. The surface of the material is coated with a colored layer consisting of two layers, a primer layer consisting of a polyethylene component and a primer component having a polar group, and a coating layer. Made it possible to color the tape by means other than winding the tape.

For this reason, the coloring work can be carried out either in the factory or on site, and the existing automatic coating machine can also perform the forming work of the coloring layer, so that the productivity can be improved and it is economical. .

Furthermore, not only the appearance or appearance of the coated cable and the quality of the colored layer can be satisfied, but also the weather resistance is sufficient even when the colored layer is lost.
Further, it is an industrially useful invention that partial repair and full surface repair, which have been problems in the conventional coated cable, can be performed by simple painting and baking work.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of the coated cable of the present invention, FIG. 2 is a schematic sectional view showing an automatic painting facility used for forming a colored layer in the coated cable of the present invention, and FIG. It is sectional drawing which shows the structure of the covered cable. The names of the symbols are as follows. (1) …… Hard steel wire bundle, (1a) …… Steel wire, (2) …… Base material, (3) …… Primer layer, (4) …… Coating layer, (1
0) …… washer, (10a) …… wash water spray pipe, (10
b) …… Washing water drainer, (11) …… Automatic coating machine, (11a)
…… Deodorizer, (11b) …… Paint mist remover, (11
c) …… Hood, (11d) …… Paint spray, (12) ……
Paint supply device, (12a) …… mixer, (12b) …… compressor, (12c) …… paint tank, (13) …… hot air circulating furnace,
(13a) …… Hot air generator, (14) …… Far infrared radiation furnace,
(15) …… Cooling device,

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hidesada Kinji 2-3, Shinsenri Nishimachi, Toyonaka City, Osaka Prefecture, D4 (56) Reference JP-A-55-132786 (JP, A) JP-A-1-260081 (JP, A)

Claims (1)

[Claims] 1. A hard steel wire bundle is arranged on a core wire, the surface of which is covered with a base material made of polyethylene containing carbon black, and a polyethylene component and a primer component having a polar group are provided on the surface of the base material. A colored polyethylene-coated cable having a structure in which a colored layer composed of two layers of a base layer and a coating layer consisting of is coated.