JPS5913124B2 - Slippery wire and its manufacturing machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric wire having a plurality of substantially conical recesses formed on the surface of the coating layer of a vinyl chloride-coated electric wire, that is, a slippy wire, and an apparatus for manufacturing the same.

Conventionally, jumper wires used, for example, in the wiring between telephone exchanges, etc., are made by covering the surface of a core wire 2 with a coating layer 2 made of vinyl chloride material, as shown in Fig. 1. is formed to be quite smooth (surface roughness of 1 no. 5 to 2.5 μm).

Therefore, if a large number of wires are used in bundles, such as jumper wires, the first
If you try to pull it out as shown by the arrow in the figure, it will be difficult to pull it out because the contact with the adjacent wire is in line contact with each other and the degree of adhesion is large. However, the sheathing of the remaining covered wires was often damaged as well. This phenomenon also occurs in coated wires coated with other plastics, synthetic rubbers, and natural rubbers. This is a drawback caused by the good adhesion between adjacent covered wires. The present invention has focused on the above-mentioned drawbacks of covered electric wires, and provides a covered electric wire having a structure in which the contact between adjacent covered electric wires is a point contact, and the degree of mutual adhesion is minimized. It is also an object of the present invention to provide an apparatus for manufacturing such a covered electric wire.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the slippy wire of the present invention, consisting of a coating layer 3' applied to the outer surface of the core wire 2''.

The outer surface of the coating layer 3'' has a depth such that the core wire 2'' is not exposed, and a plurality of substantially conical recesses each having a diameter of about 5 to 10 μm are formed. Since the concave portion is formed on the surface of the coating layer 31, when a large number of electric wires are arranged in close contact with each other like the zipper wire, even when any electric wire in the wire bundle is pulled out, the adjacent electric wires can be easily removed. The outer surfaces of the wires have a low degree of adhesion, and can be easily pulled out with a small pulling force, without damaging the coating layers between the wires. If the diameter and depth of the recesses on the surface of the coating layer are larger than the above ranges, the mechanical tensile strength of the coating layer tends to decrease due to the physical properties of the coating material, and the efficiency of the manufacturing process is reduced. Moreover, if it is smaller than the above range, the reduction in friction between adjacent lines, which is the objective of the present application, cannot be achieved. Next, the apparatus for manufacturing Slitsby wire according to the present invention will be explained.

In order to form hemispherical recesses on the surface of the coating layer, it is possible to form the recesses by changing the type of coating material or extrusion conditions, but in the usual method of continuously manufacturing covered wires, It is difficult to form a necessary and sufficient number of recesses in the longitudinal direction of the covered wire, and at the same time this also affects various properties of the covered wire.

For example, if a material that is difficult to extrude is forced out, or if the extrusion temperature is lowered and forced out, the surface of the extruded coating will have a rough surface with recesses, but if appropriate conditions are applied to the coating material. Because it is not
Covering materials have many disadvantages due to their inherent physical properties, such as reduced elongation and brittleness, tendency to crack at low temperatures, large changes in material quality at high temperatures, and deterioration of electrical insulation resistance. . In the slippy wire manufacturing apparatus according to the present invention, a coating material,
It is an object of the present invention to provide a manufacturing apparatus that performs extrusion under optimal conditions without changing extrusion conditions, and forms recesses thermally and mechanically using a die.

Therefore, the coating material can be coated under the best conditions without affecting the properties of the coating. DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the slippy wire manufacturing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 3 shows the configuration of an apparatus for manufacturing slippy wire using a core wire as a base material through a continuous process.

FIG. 4 shows the construction of a manufacturing apparatus for a slippy wire whose base material is a ready-made, that is, a vinyl chloride-coated electric wire whose coating layer has a smooth surface.

In Fig. 3, reference numeral 6 denotes a core wire supply drum around which the core wire 9 is wound, and 7 an extrusion device that heats and melts the beret-shaped vinyl chloride material constituting the coating layer, coats it around the core wire, and sends it out. 4 is a press machine consisting of two rolls, 5 is a cooling device, and 8 is a winding drum for slippy wire.

5 and 6 show the structure of the press rolls 13 and 14 which are the main parts of the press machine 4, and FIG.
FIG. 2 is a schematic diagram showing the structure and arrangement of FIG. FIG. 5 is a perspective view of a single roll, and FIG. 6 is an enlarged sectional view of the opposing portions of two rolls 13 and 14. The press rolls 13 and 14 have a semicircular groove corresponding to the outer diameter of the covered electric wire on the outer circumferential side of a disc body, and a plurality of approximately conical convex portions are provided on the surface of the groove. . As shown in FIG. 6, the push rolls 13 and 14 are arranged so that their grooves face each other, and a driving device (not shown) applies a rotational force in the direction in which the covered wire passes between the grooves in one direction. It is being The manufacturing apparatus shown in FIG. 3 manufactures slippy wire through the following operations.

The core wire 9 drawn out from the core wire supply drum 6 is fed into an extruder 7. In the extruder 7, a heating mechanism heats the pellet-shaped vinyl chloride raw material to a temperature of about 160 to 180°C to melt it, and the core wire 9 fed into the extruder 7 has a smooth surface with a substantially uniform thickness. A vinyl chloride-covered electric wire (hereinafter referred to as a "covered wire") 10 having a pinyl chloride layer coated thereon is formed. Next, extruder 7
The double wire 10 is fed into a press machine 4VC while the coating layer has a temperature in the softening range of vinyl chloride of about 50° C. or higher, and is passed between the two press rolls 13 and 14. pass. The substantially conical convex portions provided on the surfaces of the grooves of the two pressing rolls 13 and 14 have a depth that does not expose the surface of the core wire 9 on the surface of the coating layer of the coated wire 10. A large number of substantially conical recesses are formed. Then, the coated wire 10 having a large number of recesses formed on the surface of the coating layer, that is, the slip wire, is cooled to about room temperature when passing through the cooling device 5 in the next step, and is wound onto a winding drum 8VC. The above manufacturing apparatus is an apparatus that continuously manufactures from the core to the slippery wire while rotating the core wire supply drum 6 and the winding drum 8 at a constant speed.
After applying the coating layer to the core wire 9, the press machine 4 having two press rolls 13 and 14 reaches a stage where the coating layer temperature maintains the softening range of vinyl chloride in the process leading to the cooling device 5. Just place it.

Next, FIG. 4 shows an apparatus for continuously manufacturing slippy wire using a ready-made coated wire 10 as a base material.
1 is a supply drum for the coated wire 10, 12 is a heating device, and other symbols are the same as those in FIG. 3.

Covered wire 10 fed out from supply drum 11 in the direction of the arrow
is led to a heating device 12.

The heating device 12 has a heater that heats the vinyl chloride forming the coating layer of the covered wire 10 to its softening temperature range, and the coating layer of the covered wire 10 becomes softened while passing through the heating device 12. Then, the coated wire 10 is sent to the press die 4VC, which is the next process, while the coating layer is maintained in a softened state. The pressing machine 4 has the same structure and operation as that shown in FIG. 3, and a large number of substantially conical recesses are formed on the outer surface of the coating layer of the covered wire 10. The coated wire 10 having recesses formed on its surface, that is, the slippy wire, is then passed through the cooling device 5 and wound around the winding drum 8VC. FIG. 8 shows an embodiment in which the press rolls 13 and 14 of the press machine 4 of the slippy wire manufacturing apparatus according to the present invention shown in FIG. 7 are replaced with belts 13'' and 14''.

The belts 13'' and 145 are disposed facing each other, and the belt 1
A semicircular groove corresponding to the outer diameter of the covered wire 10 is provided on the surface of each of the wires 3'' and 14'', and a plurality of substantially conical convex portions are provided on the inner surface of the groove. When the vinyl chloride coating layer is in the softening temperature range, the coated wire 10 is attached to this belt 1.
If it is inserted between 3″ and 14″, the press roll 13
, 14, recesses can be formed on the surface of the coating layer. Also, the roller 13 of the pressing machine 4
, 14 and the belts 13'', 14'' themselves have heating mechanisms, it is possible to omit the heating device 12 shown in FIG. 4.

As explained above in detail, the slippy wire according to the present invention is formed by forming a large number of substantially conical recesses on the surface of the vinyl chloride coating layer, so it is a coated wire with a smooth surface of the coating layer. The adjoining wires do not come into close contact as in the case of zipper wires that are bundled, but the contact is small, so when pulling out several wires from the bundled wires, the wires to be pulled out are also It can be easily pulled out with less external force without damaging the covering of other remaining wires, which greatly benefits work efficiency and improved wiring reliability.

Furthermore, the apparatus of the present invention for manufacturing such slitsby wire is similar to the conventional wire making process except that a pressing machine is provided in which rollers or belts having hemispherical protrusions on the inner surface of the concave groove provided on the outer circumferential surface are arranged facing each other. Since the manufacturing equipment used can be used,
Extrusion and stamping processes can be realized under optimal conditions without changing the coating material or extrusion conditions, and the increase in manufacturing man-hours is small and the economic effect is large. In the present invention, vinyl chloride is used as the coating material, but other thermoplastic materials such as plastics, synthetic rubber, etc. may also be used in view of the spirit of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional coated wire, Fig. 2 is a perspective view of a slippy wire, Figs.
The figure is a partially enlarged view of the cross section of the press roller, FIG. 7 is a block diagram of the press machine, and FIG. 8 is a block diagram of the case where a belt is applied to the press machine. 1... Conventional covered wire, 2, 2'', 9...
... Core wire, 3 ... Coating layer, 1" ... Slippy wire, 3" ... Concavity on the surface of coating layer,
4... Pressing machine, 5... Cooling device, 6
... Core wire supply drum, 7 ... Extruder, 8 ... Winding drum, 10 ... Covered electric wire, 11 ... Covering Electric wire supply drum, 12・
... Heating device, 13, 14 ... Press roll, 13', 14' ... Press belt.

Claims (1)

[Scope of Claims] 1. A plurality of approximately conical recesses having a depth that does not expose the core wire are formed on the outer surface of the coating layer of a vinyl chloride-coated electric wire formed by coating the outer surface of the core wire with a vinyl chloride layer. Slippy wire characterized by: 2. Continuously rolling a vinyl chloride-coated wire, which consists of a roller that takes out the core wire wound on a drum, a device that applies vinyl chloride material to the surface of the core wire, a coating layer cooling device, and a drum that winds the vinyl chloride-coated wire. In the manufacturing apparatus, the vinyl chloride is applied along the outer peripheral surface at a position where the temperature of the vinyl chloride coating layer is within the softening temperature range of the vinyl chloride material, between the vinyl chloride material application device and the coating layer cooling device. A press formed by having two rolls each having a semicircular groove corresponding to the outer diameter of the covered electric wire and having a plurality of substantially conical convex portions on the surface of the groove, the grooves being arranged to face each other. A slipper wire manufacturing device characterized by being equipped with a molding machine. 3. In an apparatus for continuously manufacturing a vinyl chloride-coated electric wire, which consists of a roller that takes out a vinyl chloride-coated electric wire wound around a drum, a coating layer cooling device, and a drum that winds up the vinyl chloride-covered electric wire, the drawing-out roller and the coating Two semicircular concave grooves corresponding to the outer diameter of the vinyl chloride-coated electric wire are provided along the outer circumferential surface between the layer cooling device and a plurality of approximately conical convex portions are provided on the surface of the concave grooves. A slippery slipper, characterized in that the concave grooves of the rolls are arranged to face each other, and a pressing machine is provided that has heating means for maintaining the vinyl chloride coating material passing through the concave grooves within its softening temperature range. Wire manufacturing equipment.