JP2000100265A - Manufacture of rubber-covered wire, and manufacturing device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a cross sectional form of a vulcanized rubber layer, a flaw of its surface, etc., in a manufacturing method for a rubber- covered wire, and compact facilities. SOLUTION: A core 1 for an electric wire is fed in the longitudinal direction, while the wire core 1 is preheated till its temperature rises. The wire core 1 is coated with rubber heated to a vulcanizing temperature, so a semi- vulcanized rubber layer is formed on an outer circumferential surface of the wire core 1. The semi-vulcanized rubber layer is then regularly vulcanized to form a vulcanized rubber layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for producing a rubber-coated electric wire.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a rubber-coated electric wire, for example, as shown in FIG. 4, an unvulcanized rubber coating machine c applies an unvulcanized rubber coating machine c to an electric wire core a fed from a core wire feeding machine b. The unvulcanized rubber is coated with the vulcanized rubber to form an unvulcanized rubber-coated wire j. Subsequently, the unvulcanized rubber is vulcanized at a vulcanization line d, then passed through a cooling line e, and is taken by a take-off machine f on the downstream side thereof. Take-up, and further, a method of winding by a winder g on the downstream side has been adopted.

As another manufacturing method, FIGS. 5 (a) and 5 (b)
As shown in (c), a production method including three steps may be employed. That is, in the step of FIG. 5 (a), an unvulcanized rubber is coated on an unvulcanized rubber with a nonvulcanized rubber coating machine c to coat an electric wire core a fed from a core wire feeding machine b. Then, it is cooled in a cooling water tank h, further taken up by a take-up machine f, and taken up by a take-up machine g downstream thereof. Next, FIG.
In the step (b), the covered wire j fed from the feeding machine k is
Lead or the like is coated on the unvulcanized rubber surface with a lead machine m for surface protection or appearance shaping, shaped with a squeeze straightening roll n, and then wound up with a winder o. Then, in the step of FIG. 5C, the wound body q of the wound covered wire j is put into a vulcanizing pot p and vulcanized.

[0004]

However, according to the method described with reference to FIG. 4, the vulcanizing line d is used (since only the unvulcanized rubber is coated by the unvulcanized rubber coating machine c). In this case, there has been a problem that the unvulcanized rubber is extremely softened and a cross-sectional deformation occurs. In order to prevent the cross-sectional deformation, the vulcanization line d is drawn in a catenary curve or a linear vulcanization line that does not touch the coated surface, and a long linear distance is required. There is a problem that becomes large.

In the method described with reference to FIGS. 5 (a), 5 (b) and 5 (c), when the unvulcanized rubber-coated wire j is wound on a winding machine g, the rubber coating is still in a soft state (not yet). (Vulcanized rubber), there were problems such as the surface being damaged at the time of take-up or take-up, and the cross section being flattened when crushed. In addition, the rubber is susceptible to deformation, swelling, voids, and surface bumps due to unvulcanization, so it is coated with lead, methylpentene polymer (TPX), nylon, resin tape, etc. for shaping or protecting the surface and vulcanizing. Later, a step of stripping the coating material was required.

Accordingly, the present invention solves the above-mentioned problems, and can prevent deformation, swelling, voids, surface bumps, and the like of the rubber coating layer, and provide a coating for shaping the appearance or protecting the surface during the manufacturing process. An object of the present invention is to provide a method for producing a rubber-coated electric wire that does not require a layer to be formed and can further reduce the size of equipment.

Further, the present invention can prevent deformation, swelling, voids, and bumps on the rubber coating layer, and eliminate the need for forming a coating layer for shaping the appearance or protecting the surface during the manufacturing process. An object of the present invention is to provide a rubber-coated electric wire manufacturing apparatus capable of downsizing equipment.

[0008]

In order to achieve the above-mentioned object, a method of manufacturing a rubber-coated electric wire according to the present invention is to raise a core wire for an electric wire to a vulcanization temperature while feeding the core wire for the electric wire in a longitudinal direction. The semi-vulcanized rubber layer is formed on the outer peripheral surface of the electric wire core wire by coating with the heated rubber, and then the semi-vulcanized rubber layer is fully vulcanized.

Further, the core wire for electric wire is preheated to increase the temperature, and the heated core wire for an electric wire is covered with rubber heated to the vulcanization temperature to form a semi-vulcanized rubber layer. Further, a semi-vulcanized rubber layer is formed on the outer peripheral surface of the core wire for an electric wire, and the semi-vulcanized rubber layer is subsequently fully vulcanized. Further, a semi-vulcanized rubber layer is formed on the outer peripheral surface of the electric wire core wire, and the semi-vulcanized rubber covered wire composed of the electric wire core wire and the semi-vulcanized rubber layer is wound on the downstream side to form a wound body. Then, the wound body is put into a vulcanizing pot, and the semi-vulcanized rubber layer is fully vulcanized.

[0010] Also, the rubber-coated electric wire manufacturing apparatus according to the present invention comprises a feeding means for feeding the electric wire core wire in the longitudinal direction, a core wire preheater for preheating the electric wire core wire, and a downstream side of the core wire preheater. A semi-vulcanized rubber coating means for coating the core wire for the electric wire with the rubber heated to the vulcanization temperature, and a main vulcanization means for main vulcanizing the semi-vulcanized rubber coated with the core wire for the electric wire,
It is characterized by having.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of a rubber-coated electric wire manufacturing apparatus according to the present invention.
Is a device for continuously manufacturing the rubber-coated electric wire 15 while feeding the electric wire core wire 1 in the longitudinal direction indicated by the arrow B. The feeding machine 2 feeds out the electric wire core wire 1 in order from the upstream side to the downstream side.
A core preheater 3 for preheating the electric wire core 1, a semi-vulcanized rubber coating means 4 for coating the electric wire core 1 with rubber heated to the vulcanizing temperature, and a semi-cured rubber covering the electric wire core 1. The vulcanizing device includes a main vulcanizing means 5 for main vulcanizing the vulcanized rubber, a cooling line 6, a take-up machine 7, and a winding machine 8.

Thus, the feeder 2 and the take-up machine 7 constitute a feeding means 9 for feeding the wire core wire in the longitudinal direction. The semi-vulcanized rubber coating means 4 includes an extruder 10 for extruding the unvulcanized rubber, a heating unit 11 for raising the temperature of the unvulcanized rubber extruded from the extruder 10 to a vulcanization temperature, and a heating unit. And an extrusion coating head 12 for coating the rubber core 1 having the temperature raised at 11 on the running electric wire core wire 1. This heating part 11
Is a part that provides a high-temperature environment in which heating can proceed.

Although a high-frequency heating device such as a microwave is used as the vulcanizing means 5, any one of a hot-air vulcanizing tank, a molten salt bath, and a steam pipe may be used. . In some cases, other vulcanization means 5 may be used.

Next, in order to manufacture the rubber-coated electric wire 15 by the rubber-coated electric wire manufacturing apparatus, the core 1 for the electric wire is preheated by the core preheater 3 while the core 1 for the electric wire is fed in the longitudinal direction. Raise the temperature. Next, the semi-vulcanized rubber layer is coated on the outer peripheral surface of the electric wire core wire 1 by coating the heated core wire 1 with rubber heated to the vulcanization temperature by the semi-vulcanized rubber coating means 4. To form That is, as shown in the cross-sectional view of FIG. 2, a semi-vulcanized rubber covered wire 14 composed of the electric wire core wire 1 and the semi-vulcanized rubber layer 13 is formed. Specifically, the unvulcanized rubber heated in the heating section 11 of the semi-vulcanized rubber coating means 4 undergoes vulcanization immediately after leaving the extrusion coating head 12, and the rubber surface becomes somewhat hard. It becomes the semi-vulcanized rubber layer 13.

(Returning to FIG. 1) Subsequently, the semi-vulcanized rubber layer 13 of the semi-vulcanized rubber coated wire 14 is fully vulcanized by the main vulcanizing means 5. At this time, the surface of the semi-vulcanized rubber layer 13 is hardened to some extent due to the progress of vulcanization and does not extremely soften, and the semi-vulcanized rubber layer 13 is used as another layer (lead, TPX, resin tape, etc.). Even without coating, the cross-sectional shape is not flattened, the surface is not damaged, and no voids, surface bumps, fog, etc. are generated. And vulcanization conditions can be relaxed.

Further, by cooling in the cooling line 6 on the downstream side, a rubber-coated electric wire 15 comprising the electric wire core wire 1 and the vulcanized rubber layer 16 is formed (see FIG. 2). Then, the rubber-coated electric wire 15 is wound by the winder 8.

As described above, according to the method of manufacturing the rubber-coated electric wire and the apparatus for manufacturing the same, the cross-sectional shape of the vulcanized rubber layer 16 can be reliably made circular, and a smooth and beautiful surface can be obtained. Even cables (rubber-coated wires) that cannot be vulcanized by nakedness (requires covering winding of lead, TPX, nylon, tape, etc.) are prevented from flattening, scratching, voids, surface bumps, swelling, etc. There are advantages that can be done.

Next, FIG. 3 shows another embodiment of the rubber-coated electric wire manufacturing apparatus according to the present invention. This apparatus A is a feeder that feeds the electric wire core wires 1 in order from the upstream side to the downstream side. 2
A core wire preheater 3 for preheating the wire core 1, a semi-vulcanized rubber coating means 4 for coating the wire core 1 with rubber heated to the vulcanization temperature, a cooling water tank 17, a take-up machine 7, , A winder 8.

The vulcanizing device 5 further includes a main vulcanizing means 5 for accommodating the semi-vulcanized rubber-coated wire 14 wound by the winder 8 in a state of a wound body 18 for main vulcanization. In this case, the vulcanizing means 5 is a vulcanizing pot 19 (steaming pot) for vulcanizing with steam. The other configuration is the same as that described with reference to FIG.

In order to manufacture the rubber-coated electric wire 15 by the rubber-coated electric wire manufacturing apparatus A, the electric wire core 1 is fed in the longitudinal direction while the electric wire core 1 is connected to the core preheater 3.
And heat it up. Next, the heated core wire 1 is coated with the rubber whose temperature has been raised to the vulcanization temperature by the semi-vulcanized rubber coating means 4, and further cooled to room temperature in the cooling water tank 17. A semi-vulcanized rubber covered wire 14 comprising the core wire 1 for use and the semi-vulcanized rubber layer 13 is formed (see FIG. 2).

Further, the semi-vulcanized rubber-coated wire 14 is wound by the winder 8 on the downstream side (returning to FIG. 3) to form a wound body 18. 20 is a winding drum. At this time, since the semi-vulcanized rubber layer 13 is hard to some extent, the cross-sectional shape does not become flat and the surface is not damaged. And
Even if the semi-vulcanized rubber layer 13 is not covered with another layer (lead, TPX, resin tape, or the like), it is possible to prevent cross-sectional deformation, swelling, voids, and the like.

Thereafter, the wound body 18 is placed in a vulcanizing pot 19, and the semi-vulcanized rubber layer 13 of the semi-vulcanized rubber covered wire 14 is fully vulcanized. In other words, the vulcanization is carried out by placing the vulcanizer 19 at a constant pressure and a constant temperature for a predetermined time. At this time, the semi-vulcanized rubber layer 13 does not extremely soften, does not have a flat cross-sectional shape, does not have a scratch on the surface, and does not generate voids, surface bumps, swelling, and the like. Thereafter, if the wound body 18 is taken out of the vulcanizing pot 19, the rubber-coated electric wire 15 having a circular cross section and a smooth and beautiful surface is completed.

[0024]

Since the present invention is configured as described above, the following effects can be obtained.

According to the method for producing a rubber-coated electric wire according to the first aspect, the semi-vulcanized rubber layer 13 is hardened to some extent, so that the semi-vulcanized rubber layer 13 is replaced with another layer (lead, TPX) during the main vulcanization. , Resin tape, etc.), the cross-sectional shape is not flattened, the surface is not scratched, and no voids, bumps, fog, etc. are generated.

According to the method for producing a rubber-coated electric wire according to the second aspect, when the electric wire core wire 1 is coated with the rubber heated to the vulcanization temperature, the electric wire core wire 1 is preheated. Is not lowered, and the semi-vulcanized rubber layer 13 can be formed reliably.

According to the method for producing a rubber-coated electric wire according to the third aspect, the vulcanization conditions for the main vulcanization can be relaxed, the vulcanization time can be shortened, and the main vulcanization can be surely performed. In addition, since the semi-vulcanized rubber layer 13 has an appropriate hardness before the main vulcanization, it is possible to effectively prevent deformation of the cross-sectional shape and damage to the surface, and shorten the line for the main vulcanization. And contribute to downsizing of equipment.

According to the method for producing a rubber-coated electric wire according to the fourth aspect, since the semi-vulcanized rubber layer 13 having an appropriate hardness is formed in advance at the time of the main vulcanization, deformation of the cross-sectional shape, damage to the surface, etc. Can be effectively prevented. In addition, since the semi-vulcanized rubber layer 13 can be fully vulcanized while being naked, there is no need to temporarily add a layer for shaping the surface or protecting the surface, which was required in the past, during the production, thereby simplifying the equipment. It is possible to reduce the size and man-hours. Further, the vulcanization time can be reduced.

According to the rubber-coated electric wire manufacturing apparatus according to the fifth aspect, the semi-vulcanized rubber layer 13 is reliably formed before the main vulcanization, and the rubber surface is somewhat hardened, so that the cross-sectional shape is deformed. Or scratches on the surface, voids, surface bumps,
No fogging or the like occurs. Therefore, it is possible to manufacture the rubber-coated electric wire 15 having good electric performance and having no problem in appearance. Further, the apparatus can be simplified and made compact, and the productivity can be increased.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is an overall configuration diagram of another embodiment.

FIG. 4 is an explanatory view of a conventional example.

FIG. 5 is an explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core wire for electric wires 3 Core wire preheater 4 Semi-vulcanized rubber coating means 5 Main vulcanizing means 9 Feeding means 13 Semi-vulcanized rubber layer 14 Semi-vulcanized rubber coated wire 18 Wound body 19 Vulcanizer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29L 21:00 F term (Reference) 4F203 AA45 AD15 AG03 AH35 AM32 DA11 DB02 DC01 DC04 DL14 DN16 4F207 AA45 AD15 AG03 AH35 AM32 KA01 KA17 KB18 KJ05 KW33 5G325 JA01 JC01

Claims (5)

[Claims] 1. An electric wire core wire is fed in a longitudinal direction while the electric wire core wire is covered with a rubber heated to a vulcanization temperature, and a semi-vulcanized rubber layer is formed on an outer peripheral surface of the electric wire core wire. Forming a semi-vulcanized rubber layer and then fully vulcanizing the semi-vulcanized rubber layer. 2. A semi-vulcanized rubber layer is formed by preheating a core wire for an electric wire to raise the temperature, and coating the heated core wire with a rubber heated to a vulcanization temperature. 2. The method for producing a rubber-coated electric wire according to 1. 3. The method for producing a rubber-coated electric wire according to claim 1, wherein a semi-vulcanized rubber layer is formed on the outer peripheral surface of the electric wire core wire, and the semi-vulcanized rubber layer is subsequently fully vulcanized. 4. A semi-vulcanized rubber layer is formed on an outer peripheral surface of a core wire for an electric wire, and a semi-vulcanized rubber coated wire composed of the core wire for an electric wire and the semi-vulcanized rubber layer is wound and wound on a downstream side. The method for producing a rubber-coated electric wire according to claim 1 or 2, wherein a body is formed, and thereafter, the wound body is placed in a vulcanizing pot and the semi-vulcanized rubber layer is fully vulcanized. 5. A feeding means for feeding a wire core in a longitudinal direction to a wire core, a wire preheater for preheating the wire core, and a rubber heated to a vulcanization temperature downstream of the wire preheater. A semi-vulcanized rubber coating means for covering the core wire for electric wire with a vulcanizing means for main vulcanizing the semi-vulcanized rubber coated with the core wire for the electric wire. apparatus.