JPS6142369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing different color electric wires, which simultaneously manufactures a plurality of different color electric wires.

In communication wires, electric wires for equipment wiring, and the like, insulating coatings covering the outer periphery of core wires are coated in different colors in order to identify the wires.

Traditionally, different colored wires were manufactured separately on multiple production lines. However, this manufacturing method has the disadvantage that it requires a large number of machines and a large number of workers, resulting in high costs. Another disadvantage was that the installation space of the machine was large.

An object of the present invention is to provide a method for manufacturing different colored electric wires that can efficiently produce different colored electric wires at low cost on a common production line.

The method for manufacturing different colored electric wires according to the present invention includes feeding a plurality of core wires into a common crosshead, and feeding different colored coating materials into the crosshead from a plurality of extruders to extrude and coat the outer periphery of each of the core wires. It manufactures multiple wires of different colors.

Next, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 6 show specific examples of apparatus for carrying out the method of the present invention. As shown in the figure, in this embodiment, two core wires 3, 3' are fed into a common crosshead 1 from separate supply bobbins 2, 2' via guide rolls 4, 4'. The crosshead 1 has a crosshead body 1A, and two set holes 5, 5' are bored through the crosshead body 1A.
A dividing surface 6 is provided in the crosshead body 1A in a direction transverse to these set holes 5, 5', so that the crosshead body 1A is divided. The divided crosshead bodies 1A are connected by bolts (not shown) or the like. An independent die/nipple unit 7, 7' is fitted into each set hole 5, 5', and is prevented from coming off by a stopper 8, 8'. Dice nipple unit 7 is sleeve 9
An inner nipple 10 and an outer nipple 11 are coaxially fitted into the sleeve 9 from the entrance side and fixed to the sleeve 9 by a nipple presser 12. A die 13 is fitted into the sleeve 9 from its outlet side, and is fixed to the sleeve 9 by a die holder 14. On the tip side between the inner nipple 10 and the outer nipple 11, there is an inner extrusion path 1.
5 is formed, and an outer extrusion path 16 is formed between the tip side of the outer nipple 11 and the die 13. In order to supply the coating material to these extrusion passages 15 and 16, coating material inlets 17 and 18 are formed in the sleeve 9. A core wire passage hole 19 is bored in the center of the inner nipple 10. Similarly, the die/nipple unit 7' has a sleeve 9', into which a nipple 10' is fitted from the entrance side and fixed to the sleeve 9' by a nipple presser 12'. A die 13' is fitted into the sleeve 9' from its outlet side, and is fixed to the sleeve 9' by a die holder 14'. An extrusion path 15' is formed between the tip of the nipple 10' and the die 13'. In order to supply the coating material to this extrusion path 15', a coating material inlet 17' is formed in the sleeve 9'. A core wire passage hole 19' is bored in the center of the nipple 10'. Inside the crosshead main body 1A, there are a coating material channel 21 for supplying coating material from a first extruder 20 to the coating material inlets 17, 17' of each die/nipple unit 7, 7', and a second extruder 22. From the coating material inlet 18
A coating material flow path 23 for supplying coating material to is formed. The second extruder 22 supplies a coating material of a different color from that of the first extruder 20.

A common cooling tank 25 is installed on the exit side of the crosshead 1 to cool the different colored wires 24, 24' coming out of the crosshead 1. A common take-off machine 26 is installed on the exit side of the cooling tank 25 to take off the different colored electric wires 24, 24'. Collection machine 2
A common winding bobbin 27 for winding the different colored electric wires 24, 24' is installed on the exit side of the wires 6.

Next, a method for manufacturing different color electric wires using the above manufacturing line will be described. When two core wires 3, 3' are fed from the supply bobbins 2, 2' to the crosshead 1, the core wires 3 pass through the core wire passing hole 19 of the die/nipple unit 5, and the core wire 3' passes through the core wire passing hole of the die/nipple unit 5'. Pass through 19'. dice·
The core wire 3 passing through the nipple unit 5 is extruded and coated with a coating material with good electrical insulation such as polyethylene supplied from a first extruder 20 as an inner coating layer 28, and then supplied from a second extruder 22. A colored coating material (this coating material is made by adding a coloring agent to a plastic such as polyethylene, and has a different color from the coating material supplied from the first extruder 20) is applied to the outside. It is extruded and coated as a coating layer 29 to form the electric wire 24. The surface of this electric wire 24 has a color determined by the outer coating layer 29. The core wire 3' passing through the die/nipple unit 5' is extruded and coated with a coating material having good electrical insulation properties as a coating layer 28' supplied from the first extruder 20, and is called an electric wire 24'. The surface of this electric wire 24' has the color of the covering material itself determined by the covering layer 28'. Therefore, the electric wires 24, 4' are wires of different colors. These different colored wires 24,2
4' are formed to have the same outer diameter. Different colored wires 2
4 and 24' are then sent to a common cooling tank 25 to be cooled, taken up by a common take-up machine 26, and wound up by a common winding bobbin 27.

Note that if the die/nipple unit 7' also has a two-layer extrusion structure like the die/nipple unit 7, the color of the electric wire 24' can be made different from that of the coating layer 28', and the electric wires 24, 2
The color combination of 4' can be changed arbitrarily.

Furthermore, the present invention is not limited to the manufacture of two wires of different colors, but can be similarly applied to the manufacture of three or more wires of different colors.

As explained above, in the method for manufacturing different colored electric wires according to the present invention, coating materials of different colors are sent from a plurality of extruders to a common crosshead and extruded to coat the outer periphery of each core wire. Electric wires can be manufactured efficiently on one line. Furthermore, if the crosshead is common, the equipment becomes simpler, equipment costs are lower, and wires of different colors can be manufactured at a lower cost. Furthermore, if the crosshead is common, the installation space occupied by the crosshead will be smaller compared to one with multiple crossheads, and the path length of each different color wire to the next stage cooling tank will be the same, so different colors can be installed under the same conditions. There is an advantage that the electric wire can be led to the cooling tank.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a plan view and a side view showing an example of a manufacturing line for implementing the method of the present invention, and FIG. 3 is a crosshead die used in this example.
Cross-sectional view with the nipple unit omitted, No. 4
The figure is a cross-sectional view of the crosshead at the cracked surface with the die/nipple unit installed, and FIGS. 5 and 6 are cross-sectional views showing an example of different colored electric wires. 1...Crosshead, 1A...Crosshead body, 2, 2' supply bobbin, 3, 3' core wire, 5, 5'
... Set hole, 7, 7' die/nipple unit, 15, 15'... Inner extrusion path, 16... Outer extrusion path, 17, 17', 18... Covering material inlet,
20...first extruder, 22...second extruder,
24, 24'...different colored wires, 25...cooling tank,
26... Take-up machine, 27... Winding bobbin.

Claims (1)

[Claims] 1. Manufacturing a plurality of wires with different colors by feeding a plurality of core wires into a common crosshead, feeding coating materials of different colors into this crosshead from a plurality of extruders, and extruding and coating the outer periphery of each of the core wires. A method for manufacturing different colored electric wires.