JPH09129038A - Externally identificable wire material and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire material and its manufacturing method which is free from deterioration or the like of identification signs and enables highly reliable external identification. SOLUTION: There is provided a wire material 1 wherein an outer covering 4 whose base surface is luster-finished smoothly, indication parts 5 for identification signs on a surface of the outer covering 4 are each finished into a flat surface having a frosted rough surface, and the identification signs are indicated using a difference in surface roughness. A communication wire 2 and a steel core 3 are arranged and covered with the outer covering 4 made of a resin, and formed into the wire material 1 by extrusion molding. A stamp 6 has protruding roughened surfaces as indication surfaces 8 for the identification signs on a smooth base surface as a sign surface 7. The indication parts 5 for the identification signs are changed into roughened surfaces, by heating the stamp 6, pushing it against the outer covering 4, and softening the surface of the outer covering 4 by the indication surfaces 8 for the identification signs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for identifying a communication wire such as an optical cable or a coaxial cable, an electric wire, and a wire material such as a tube for the communication cable.
It is suitable for a collective type cable in which a plurality of wires are integrated together.

[0002]

2. Description of the Related Art In a collective cable or the like in which a plurality of wire rods are integrally assembled, it is necessary to individually identify the contained wire rods. It was sometimes used.

An apparatus for printing an identification mark on an outer cover for identifying a wire is "MEDEK £ SCHOERNER".
It is known in the catalog of "FMS 2-RS" which is a roll marker of the company. For example, in this roll marker, identification symbols such as company name, year, and strip length are installed behind the water tank during the manufacturing process of the wire rod, and printing tape is sandwiched between the heated printing segment and the wire rod. Is to do.

Various thermoplastic resins have been used as the material for the jacket. Polyethylene is generally the cheapest and most widely used. However, since polyethylene has poor compatibility with other resins, there is a problem in that the wire material whose outer cover is made of polyethylene has poor adhesive force of ink to the surface and peeling of the ink surface is likely to occur. In particular, there is a problem that it is difficult to print with ink on a small-diameter wire rod having an outer diameter of several mm or less. When the identification code is attached by using ink or the like different from the material of the outer cover, there is a problem that the interface is peeled off due to temperature fluctuation or the ink is discolored by ultraviolet rays during the actual use period.

Further, by changing the extrusion equipment, materials of different hues are simultaneously sent at the time of extrusion molding of the jacket to form stripes in the jacket, but there is a problem that the equipment cost is required. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the deterioration of the identification symbol over time,
For example, it is an object of the present invention to provide a highly reliable wire material that can be distinguished from the outer surface without fading due to ultraviolet rays, a method for manufacturing the wire material, and a collective cable.

[0007]

According to a first aspect of the present invention, in a wire material whose outer surface can be identified, an identification symbol is displayed on the outer surface due to a difference in roughness.

According to a second aspect of the present invention, in the wire material with the outer surface identifiable according to the first aspect, the ground surface of the outer surface is a smooth surface and the display portion of the identification symbol is a rough surface. It is characterized by.

According to a third aspect of the present invention, in the outer surface identifiable wire rod according to the first aspect, the ground surface of the outer surface is a rough surface, and the display portion of the identification symbol is a smooth surface. It is characterized by.

According to a fourth aspect of the present invention, in the wire rod having the outer surface identifiable according to any one of the first to third aspects, the display portion of the identification mark projects from the ground surface of the outer surface or It is characterized by being depressed.

In a fifth aspect of the present invention, in the method of manufacturing a wire rod whose outer surface can be identified, a wire rod having a resin outer cover is extruded so that the outer cover has a smooth surface, and immediately after extrusion molding. By pressing a stamp having a rough identification mark display surface against the outer cover in a temperature state in which the surface of the outer cover can be deformed, the identification mark display portion of the outer cover is finished to have a rough surface. It is characterized by that.

In a sixth aspect of the present invention, in a method of manufacturing a wire rod whose outer surface can be identified, a wire rod having a resin outer cover is extruded and molded so that the outer cover has a rough surface,
Immediately after extrusion molding, a stamp having a smooth display surface of the identification mark is pressed against the outer cover in a temperature state in which the surface of the outer cover is deformable, so that the display portion of the identification mark of the outer cover has a smooth surface. It is characterized by finishing so as to have.

According to a seventh aspect of the present invention, in the method of manufacturing the wire rod according to the fifth or sixth aspect, the display surface of the identification mark of the stamp is projected or depressed from the ground surface. To do.

According to an eighth aspect of the present invention, in the collective cable, a plurality of the outer surface identifiable wire rods according to any one of the first to fourth aspects can be accommodated in one container. It is a feature.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view for explaining a first embodiment of a wire rod having an outer surface identifiable according to the present invention.
1A is a perspective view of a wire rod whose outer surface can be identified, and FIG. 1B is a perspective view of a stamp. In the figure, 1 is a wire rod, 2 is a communication line,
3 is a steel core, 4 is a jacket, 5 is an identification mark display portion, 6 is a stamp, 7 is a symbol surface, and 8 is an identification symbol display surface. As shown in FIG. 1 (A), in the wire rod 1 of this embodiment, the ground surface of the outer jacket 4 is finished to have a smooth gloss, and the display portion 5 of the identification symbol on the surface of the outer jacket 4 has a matte rough surface. It is a flat-shaped communication cord that has been finished to have a flat surface, and has a jacket 4
The identification mark is displayed by using the difference in the roughness of the surface of.

The identification code includes a company name, a year of manufacture, a length of a product, a product name, a product number, a lot number, cable characteristics, and the like, and when a plurality of communication codes are accommodated in a collective cable for use. , There are symbols for distinguishing individual communication codes, and they can be arbitrarily selected as needed.

The wire 1 has a substantially rectangular cross section, a communication wire 2 such as an optical fiber element wire or a copper wire is arranged at the center, and reinforcing and supporting steel cores 3 are arranged on the left and right of the wire, and a resin jacket 4 is provided. It is covered with. The wire 1 is extruded and is extruded under manufacturing conditions that give the outer cover 4 a smooth surface.

As shown in FIG. 1B, the stamp 6 is
An identification symbol display surface 8 is formed in a convex shape on the smooth ground surface of the symbol surface 7, and this convex surface is roughened by sandpaper or the like to have fine irregularities like sandpaper. There is. The stamp 6 is heated and pressed against the outer cover 4, and the surface of the outer cover 4 is softened by the display surface 8 of the identification mark, whereby the display portion 5 of the identification mark can be roughened, and the identification mark can be displayed. It can be clearly identified. In this embodiment, a flat rough surface is formed, and the outer cover 4 is not recessed and indented corresponding to the convex shape of the display surface 8 of the identification mark of the stamp 6. Therefore, the force of pressing the stamp 6 against the outer cover 4 may be small, as long as the both can be closely attached to each other so that heat can be transferred.

Specifically, the wire 1 has a substantially rectangular cross section of 3 mm × 8 mm, and black high molecular weight polyethylene was used as the material of the jacket 4. The color does not necessarily have to be black, but it is suitable to determine the difference in the roughness of the surface of the jacket 4 when a shield color that does not easily transmit light is used. 0.05 is displayed on the display surface 8 of the identification mark of the stamp 6.
Set stamp 6 to 1 with fine irregularities of about 0.5 μm.
It was heated to 90 ° C. and pressed.

Contrary to the above description, the wire 1 may be one in which the outer cover 4 is finished into a matte rough surface and extruded. In this case, the display surface 8 of the identification mark of the stamp 6 is made smooth. The ground surface of the symbol surface 7 may be either a rough surface or a smooth surface as long as it does not contact the outer cover 4. The stamp 6 is heated and pressed against the outer cover 4, and the outer cover 4 is softened by the display surface 8 of the identification mark, and the display portion 5 of the identification mark is formed on the surface of the outer cover 4 as a glossy smooth surface,
The identification symbol can be clearly discriminated. Again,
The flat and smooth surface is formed, and the force of pressing the stamp 6 against the outer cover 4 may be small, as long as the two can be brought into close contact with each other to the extent that heat can be transferred.

The surface condition of the extruded wire 1 is
Although it varies depending on various resin materials, by changing manufacturing conditions such as extrusion temperature, inner diameter of die and point, roughness of inner surface of die, from a state with smooth gloss,
It is possible to easily change to a rough surface having unevenness of several μm or a scale-like pattern. For example, generally, if the temperature at the exit of the die is increased, the fluidity of the material is increased, the surface is smoothed and gloss appears. The surface becomes a matte state with a roughened surface.

Further, on the symbol surface 7 of the stamp 6 shown in FIG. 1B, the ground surface and the display surface 8 of the identification symbol are exchanged so that the outer surface 4 is brought into close contact with the outer surface 4. The display portion of the identification symbol may be formed on the surface of the outer cover 4 in a so-called “white” state. For example, when the jacket 4 of the wire 1 has a smooth surface, the area of the ground surface of the stamp 6 is made rough and the area of the display surface 8 of the identification mark is formed in a concave shape. In this case, the area of the ground surface shown in the figure is substantially the display surface of the "white" identification symbol.

FIGS. 2 and 3 are explanatory views for explaining the second embodiment of the wire material of the present invention whose outer surface can be identified. FIG.
FIG. 2A is a perspective view of a wire rod whose outer surface can be identified, and FIG. 2B is an enlarged sectional view of a part thereof. FIG. 3A is a perspective view of the stamp, and FIG. 3B is an enlarged sectional view of a part thereof. In the figure, 11 is a wire rod, 12 is a jacket, 13 is an identification mark display portion, 21 is a roller stamp, 21a is a shaft hole, 22 is a symbol surface, and 23 is an identification symbol display surface.

As shown in FIG. 2, the wire rod 11 of this embodiment is a communication cord having a circular cross section, and the ground surface of the jacket 12 is smooth and glossy finished. The symbol display portion 13 becomes a depressed concave portion, and the inner surface of this concave portion is finished to have a matte rough surface. The identification symbol is displayed using both the shape of the concave portion on the surface of the jacket 12 and the difference in roughness. Although illustration of the internal structure of the wire rod 11 is omitted, optical fibers and electric wires are accommodated by appropriately using tension members such as steel cores.

As shown in FIG. 3, the roller stamp 21
Has an inwardly curved symbol surface 22, the ground surface of the symbol surface 22 is a smooth surface, and an identification symbol display surface 23 is formed on the convex surface, and the convex surface is a file. The surface is rough and has fine irregularities. A rotary shaft or a fixed shaft (not shown) is fitted into the shaft hole 21a.

In the extrusion molding line for the wire rod 11,
The ground surface of the outer cover 12 is finished to have a smooth gloss, and the wire rod 11 is extruded from the extrusion die. The roller stamp 2 is provided between the extrusion die and a water-cooling cooling tank that fixes the shape of the outer layer.
1 is installed, and when the identification mark is attached to the outer cover 12, when the display surface 23 of the identification symbol on the symbol surface 22 and the ground surface are pressed against the outer cover 12, the roller stamp 21 , The wire rod 11 is rotated with the movement of the wire rod 11, and on the surface of the jacket 12, the identification symbol display portion 13 becomes a concave portion, and the inner surface of the concave portion is formed as a rough surface, and the symbol surface 22 is formed again. Separated from the envelope. Since the intaglio portion becomes a shadow and the surface is roughened and does not reflect light, the identification mark can be clearly discriminated.

As described above, in addition to changing the form of the identification mark display surface 23 and the surrounding surface to a rough surface or a glossy surface, the three-dimensional stamp in which the identification mark display surface 23 is inscribed or embossed is used. By using, it is possible to make the display of the identification symbol easier to see, and there is also an advantage that the position of the identification symbol can be easily found by touch. In particular, when the ground surface of the outer cover 12 is smooth and glossy finished, as shown in FIG. 2, if the display portion 13 of the identification mark is formed as a rough surface with engraving, the distinguishability is particularly good. become.

As a concrete example, the wire 11 is a substantially circular communication cord having a radius of 6 mm, and black carbon-containing high-molecular-weight polyethylene was used as a material for the outermost coat.
In the extrusion molding line of the wire rod 11, if the temperature of the die portion is set to 195 ° C., the surface of the jacket 12 becomes smooth and glossy. The molding speed is 10 m / min.

The identification mark display surface 23 of the roller stamp 21 is rounded and protrudes from the ground surface by about 0.6 mm, and has a vertical length of about 7 mm as shown in the drawing. It has a rough surface. As a result, the jacket 12
Is pressed by the rough surface of the identification mark display surface 23 in a softened state, and the position of the identification mark display portion 13 having a rounded and concave surface can be clearly recognized by touching, Was clearly read. Although the roller stamp 21 was not heated, even if the roller stamp 21 was heated to 190 ° C. and pressed to form the display portion 13 for the identification mark, the same clear identification performance was obtained.

FIG. 4 and FIG. 5 are explanatory views for explaining a third embodiment of the wire rod of the present invention, the outer surface of which can be identified. FIG.
FIG. 4A is a perspective view of a wire rod whose outer surface can be identified, and FIG. 4B is an enlarged sectional view of a part thereof. FIG. 5A is a perspective view of the stamp, and FIG. 5B is an enlarged sectional view of a part thereof. In the figure, 31 is a wire rod, 32 is a jacket, 33 is an identification mark display portion, 41 is a roller stamp, 41a is a shaft hole, 42 is a symbol surface, and 43 is an identification symbol display surface.

As shown in FIG. 4, the wire rod 31 of this embodiment is a communication cord having a circular cross section, and the ground surface of the outer jacket 32 is roughened so that the outer jacket 32 has a rough surface. The display portion 33 of the identification symbol on the surface becomes a protruding convex portion,
The surface of the convex portion is a smooth surface having gloss. The identification mark is displayed by using both the convex portion on the surface of the jacket 32 and the difference in roughness. Illustration of the internal structure of the wire rod 31 is omitted.

As shown in FIG. 5, the roller stamp 41 is formed.
Like the roller-shaped stamp 21 of FIG. 3, the outer shape has a symbol surface 42 that is curved inward, and a rotary shaft or a fixed shaft is fitted in the shaft hole 41a. However, the ground surface of the symbol surface 42 is a rough surface, and the identification symbol display surface 43 is formed on the rough surface, and the concave inner surface is mirror-finished to be a smooth surface.

In the extrusion molding line for the wire rod 31,
Using a facility substantially similar to that of the second embodiment described with reference to FIGS. 3 and 4, the wire rod 31 having the ground surface of the outer jacket 32 roughened is extruded from the extrusion die and cooled with the extrusion die. A roller stamp 41 is installed between the tanks, and the outer cover 3
When the identification mark is attached to 2, when the identification mark display surface 43 and the ground surface on the symbol surface 42 are both pressed against the outer cover 32, the roller stamp 41 moves as the wire rod 31 moves. Rotating on the surface of the jacket 32,
The ground surface on the symbol surface 42 and the display surface 43 of the identification symbol are
Both are brought into contact with and pressed against the softened outer jacket 32 of the wire rod 31, and the symbol surface 42 is separated from the outer jacket again. The identification symbol display portion 33 is an embossed convex portion, and the surface of the convex portion is formed as a smooth smooth surface. Since the light is incident on the embossed portion and the surface is smoothed, the light is reflected well, so that the identification symbol can be clearly discriminated.

In addition, the display surface 23 of the identification symbol is inscribed,
Although it is possible to form a smooth surface, as shown in FIG. 4, when the embossing having a smooth surface is used, the distinctiveness becomes particularly good. When the ground surface of the outer cover 32 is rough and the resin of the outer cover 32 is in a state of being easily deformed without being completely cooled, the roller stamp 41 may be pressed as it is, but when the resin is cold. Is a display surface 43 of a smooth identification symbol.
When is heated and pressed, only the identification mark display portion 33 has a smooth surface corresponding to the identification mark display surface 43.

As a concrete example, the wire 31 is the wire 1 of FIG.
It has the same shape and the same material as 1. In the extrusion molding line of the wire rod 31, when the temperature of the die portion was set to 175 ° C., the surface of the outer cover 32 became a rough uneven surface of 0.05 to 0.5 μm, and was in a matte state. The ground surface of the roller stamp 41 is a rough surface having irregularities of several μm,
The display surface 43 of the identification symbol is rounded and recessed to a depth of about 0.5 mm from the ground surface, the vertical length in the figure is about 7 mm, and the inner surface is mirror-finished. The roller stamp 41 itself was heated to 180 ° C. As a result, the outer cover 32 has a softened surface, and the display surface 43 of the identification symbol is displayed.
It was pressed by the mirror surface of No. 3, and the surface became smooth to give gloss. As a result, the position of the identification mark display portion 43, which is rounded and protrudes on the surface, can be clearly recognized by touching, and
The identification symbol was clearly readable.

In the above description, in the first embodiment described with reference to FIG. 1, when the identification mark is attached to the wire rod 1 completed as a product, the identification mark display portion 5 has an intaglio or embossed mark. The wire rod 1 is a flat rough surface or a smooth surface which is not formed. In the second and third embodiments described with reference to FIGS.
In the manufacturing process of 1, 31 in which the identification mark is attached in a state before the jacket 12 or 32 is cooled, the identification mark display portion 13 or 33 is a rough surface or a smooth surface inscribed or embossed. It was something to do.

However, the combination of the time of attaching the identification mark and the presence or absence of intaglio or embossment of the display portion of the identification symbol is arbitrary. Further, the display of the identification symbol formed by “white” described in the first embodiment can be applied to the second and third embodiments.

In the above description, the rough surface on the symbol surface of the stamp is sandpaper-like, but any surface may be used as long as it has a matte surface that absorbs light. For example, the surface of the wire jacket may be partially
Any surface that has a pattern of inside out, such as a matte surface, a shark skin, and a surface in which fine streak-like grooves are closely aligned in parallel, may be used. On the other hand, the smooth surface on the symbol surface of the stamp may be a mirror surface or a surface that is as close as possible to the surface of the outer surface of the wire rod, so long as it has a glossy surface that reflects light.

Although the stamp has a flat plate shape or a roller shape, it may be a rotating belt. Further, not only the fixed identification symbol, but when the identification symbol is the strip length of the wire rod, the type drum of the meter counter is used as a stamp, and the identification symbol is switched according to the moving length of the wire rod. Good.

As the identification symbol, the alphabet,
Although readable characters or symbols such as numbers, kana, and kanji are used, Morse code, machine-readable barcodes, or the like may be used, or may be used in combination with readable characters.

FIG. 6 is a sectional view for explaining an embodiment of the collective cable of the present invention. In the figure, 51 is a communication code and 52 is a pipe. The communication code 51 is one in which an identification symbol is displayed by the same method as the wire rods 1, 11, 31 shown in FIGS. In this collective cable, twelve externally identifiable communication cords 51 are pipes 5
The communication cord 51 is accommodated in the internal accommodation space 2 and is accommodated in the pipe 52 with a certain extra length in a loose state in which movements of the communication cord 51 are not restricted. For example, when the pipe 52 is opened at an intermediate point of the laid pipe 52, the communication code 51 has an extra length and is not fixed to the pipe. Can be selected and retrieved.

This collective cable is manufactured by, at the same time as extruding a hollow tubular polyethylene pipe, simultaneously feeding a plurality of communication cords 51 having identification symbols into the inside thereof and accommodating them in a state in which their movement is not restricted. .

To explain a concrete example, the communication code 51 is
It is 3 mm in diameter and has a black high molecular weight polyethylene jacket. The identification symbol is a letter or character string of the alphabet with a number from 01 to 12,
It is displayed every 15 cm. It should be noted that any material can be used as the jacket material as long as it can display the identification symbol in the same manner as described with reference to FIGS. The pipe 52 is made of black polyethylene having an inner diameter of 20 mm and an outer diameter of 25 mm, and a pipe identification symbol may be displayed on the surface.

[0044]

As is apparent from the above description, according to the invention described in claim 1, since the identification symbol is displayed on the outer surface due to the difference in roughness, the wire rod can be easily changed only by changing the surface condition. The effect is that the identification symbol of is displayed. As a result, the identification mark does not come off like ink, and deterioration of the identification mark over time, such as fading due to ultraviolet rays, does not occur, so that the identification mark attached to the wire has high reliability. In addition, consumable materials such as ink are unnecessary, and the material cost is low.

Particularly, when a plurality of wire rods such as small cables are contained in one container and used, it is useful for identifying the contained wire rods. For example, there is an effect that it is possible to easily identify the internal wire rod in a piping wiring in which a large number of communication cables are accommodated in a piping or a wiring using a conduit type cable in which a plurality of communication lines are accommodated.

According to the second aspect of the present invention, since the ground surface of the outer surface is a smooth surface and the identification symbol display portion is a rough surface, the identification symbol display portion is matte on the glossy outer surface. This has the effect of making it possible to clearly identify the identification symbol.

According to the third aspect of the invention, since the ground surface of the outer surface is a rough surface and the display portion of the identification symbol is a smooth surface, the display portion of the identification symbol is a matte surface. There is an effect that it becomes a glossy surface and the identification symbol can be clearly discriminated.

According to the fourth aspect of the present invention, since the display portion of the identification symbol is projected or depressed from the ground surface on the outer surface, the identification symbol has a roughness difference and an uneven shape on the outer surface. Is also displayed, and the identification mark can be clearly discriminated, and the position of the identification mark can be easily found by touch.

According to the fifth aspect of the present invention, a wire having a resin outer cover is extrusion-molded so that the outer cover has a smooth surface, and immediately after the extrusion molding, a display surface of a rough identification mark is formed. By pressing the stamp on the jacket in a temperature condition where the surface of the jacket can be deformed, the part where the identification symbol of the jacket is finished has a rough surface, so the relatively high temperature state immediately after molding is used. Then, there is an effect that the display portion of the identification symbol on the glossy outer surface is made to be a matte surface, and the identification symbol can be displayed on the wire without making a large-scale capital investment. For example, it does not require a large modification of the conventional extrusion apparatus main body, only a slight addition of a stamp is required, and it can be realized at a lower cost than the conventional ink coating and drying equipment.

According to the invention of claim 6, a wire having a resin outer cover is extrusion-molded so that the outer cover has a rough surface, and immediately after the extrusion molding, a smooth display surface of the identification mark is formed. By pressing the stamp it has on the outer cover in a temperature state in which the surface of the outer cover can be deformed, the part where the identification mark of the outer cover is displayed has a smooth surface. Since the display portion is a glossy surface, the same effect as the invention according to claim 5 is obtained.

According to the invention as set forth in claim 7, since the display surface of the identification mark of the stamp is projected or depressed from the ground surface, the identification mark is added to the outer surface of the wire in addition to the difference in roughness.
It is also displayed by the uneven shape of the outer surface, and further, the identification mark can be clearly discriminated, and the position of the identification mark can be easily known by a touch test.

According to the invention described in claim 8, claim 1 is provided.
By accommodating a plurality of the externally identifiable wire rods according to any one of items 1 to 4 in one container, there is an effect that the wire rods housed in the collective cable can be individually identified.

[Brief description of the drawings]

1A and 1B are explanatory views for explaining a first embodiment of a wire rod whose outer surface can be identified, FIG. 1A is a perspective view of the wire rod whose outer surface can be identified, and FIG. It is a perspective view.

2A and 2B are explanatory views for explaining a second embodiment of a wire rod whose outer surface can be identified, FIG. 2A is a perspective view of the wire rod whose outer surface can be identified, and FIG. It is an expanded sectional view of a part.

3A and 3B are explanatory views for explaining a second embodiment of a wire rod whose outer surface can be identified, FIG. 3A is a perspective view of a stamp, and FIG. 3B is an enlarged sectional view of a part thereof. It is a figure.

4A and 4B are explanatory views illustrating a third embodiment of a wire rod whose outer surface can be identified, FIG. 4A is a perspective view of the wire rod whose outer surface can be identified, and FIG. It is an expanded sectional view of a part.

5A and 5B are explanatory views for explaining a third embodiment of a wire rod of which the outer surface can be identified, FIG. 5A is a perspective view of a stamp, and FIG. 5B is an enlarged cross-sectional view of a part thereof. It is a figure.

FIG. 6 is a cross-sectional view illustrating an embodiment of the collective cable of the present invention.

[Explanation of symbols]

1, 11, 31 ... Wire rod, 4, 12, 32 ... Outer sheath, 5, 1
3, 33 ... Identification mark display portion, 6 ... Stamp, 7, 2
2, 42 ... Symbol surface, 8, 23, 43 ... Identification symbol display surface, 21, 41 ... Roller stamp, 51 ... Communication code, 52 ... Pipe.

Claims (8)

[Claims] 1. A wire rod having an outer surface identifiable, wherein an identification symbol is displayed on the outer surface due to a difference in roughness. 2. The wire material according to claim 1, wherein the ground surface of the outer surface is a smooth surface, and the display portion of the identification mark is a rough surface. 3. The ground surface of the outer surface is a rough surface,
The wire material according to claim 1, wherein the display portion of the identification symbol is a smooth surface. 4. The outer surface identifiable wire according to claim 1, wherein the display portion of the identification symbol is projected or depressed from the ground surface of the outer surface. 5. A wire rod having a resin outer cover is extrusion-molded so that the outer cover has a smooth surface, and immediately after the extrusion molding, a stamp having a rough identification mark display surface is formed on the outer cover. A method for producing a wire rod with an identifiable outer surface, characterized in that a surface of the outer surface is pressed to the outer cover in a deformable temperature state so that the identification mark display portion of the outer cover has a rough surface. 6. A wire rod having a resin outer cover is extrusion-molded so that the outer cover has a rough surface, and immediately after the extrusion molding, a stamp having a smooth display surface of an identification symbol is formed on the outer cover. A method for producing a wire rod with an identifiable outer surface, characterized in that the surface of the wrapping material is pressed against the outer cover in a temperature state in which the surface can be deformed, so that the portion where the identification mark of the outer cover is displayed has a smooth surface. 7. The method for manufacturing a wire rod according to claim 5, wherein the display surface of the identification mark of the stamp is projected or depressed from the ground surface. 8. A collective cable, wherein a plurality of wire rods having the outer surface identifiable according to any one of claims 1 to 4 are accommodated in one container.