JPH01118427A - Manufacture of conductor-containing plastic tube - Google Patents

Abstract

PURPOSE:To prevent conductor from breaking and at the same time contrive to mass-produce a conductor-containing plastic tube by a method wherein a plurality of twisted conductors are untwisted and, after that, introduced into an extruder. CONSTITUTION:Twisted conductors 1 are delivered from a take-up bobbin 5, which is in the rotation on its axis through the rotation of a turn table 1. On the other hand, the delivered conductors 1 are passed through a separator 8 and, after that, introduced into an extruder 9. As a result, the conductors 1 are untwisted just before their passing through the separator 8. The respective introduced conductors 1 are guided to the center hole 4a of a nipple 4 and then into the orifice 10 of a die 6 and proceeded in the direction of an outlet. Molten plastic material, which is fed from a cylinder 11, is passed through a path 20 and extruded in the form of a plastic tube 22 in a path 21 which is formed by the guide part 12 of a nipple 4 and the die 6. On the other hand, inert gas is jetted from a hollow pipe 16. Accordingly, a conductor 1-containing plastic tube is manufactured continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method of manufacturing a plastic tube containing a conducting wire.

(Technical Background of the Invention) Figure 5 shows a cross section of a plastic tube containing a conducting wire.
A plurality of conducting wires 1 are embedded in the inner peripheral surface of the tube. A plastic tube with such a structure is incorporated into an ignition device and used as a delivery pipe for flammable high-pressure gas, etc.
Further, the conducting wire 1 is connected to a connection terminal of a piezoelectric element or the like.

Now, such a plastic tube is manufactured as follows. That is, the conductive wires are fed out from a plurality of supply bobbins wound with conductive wires and introduced into an extrusion molding machine, and each conductive wire is embedded in the extrusion molding machine and extruded into a plastic tube. Conventionally, when the conductive wires are fed out, tension is applied to each conductive wire using a tension regulator, so that each conductive wire is introduced into the extrusion molding machine with a constant tension.

(Problems with the Background Art) However, since the tension regulator cannot apply completely the same tension to each conducting wire, a large tension is applied to one of the conducting wires, which often causes the wire to break. Although it is possible to reduce the rate at which the conducting wire is introduced into the extrusion molding machine to reduce breakage of the conducting wire, in this case, the productivity of the plastic tube containing the conducting wire is reduced.

(Objective of the Invention) An object of the present invention is to provide a manufacturing method that can prevent conductor wire breakage and mass-produce plastic tubes containing conductor wires.

(Summary of the Invention) The present invention is characterized in that a plurality of twisted conducting wires are introduced into an extrusion molding machine while removing the twisting.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 shows the configuration of a device for twisting the conducting wires 1, and in the figure, 2 is a well-known wire winder. A plurality of (four) conductive wires 1 are supplied to this combined wire winder 2, and each conductive wire 1 is fed out from a supply pobin 3 via a fryer 4. Therefore, a plurality of conductive wires 1 are twisted together and wound around the winding pobbin 5 attached to the wire winder 2. FIGS. 4(A) and 4(B) show the conductive wires 1 twisted together by the wire winder 2, and the four conductive wires 1 are twisted at a constant pitch.

In the manufacturing method of the present invention, the twisted conductive wires 1 are
As shown in the figure, the fiber is introduced into an extrusion molding machine 9 while removing its twist. That is, the winding pobbin 5 on which the twisted conductive wire 1 is wound is rotatably supported by the shaft 5a thereof on the opening-shaped support 6. The support body 6 is attached to a turntable 7, and the turntable 7 is rotationally driven by a drive mechanism (not shown). Therefore, the winding pobbin 5 rotates on its own axis with the rotation of the turntable 7 and unwinds the twisted conductive wire 1. On the other hand, the drawn-out conducting wire 1 is passed through a separator (batten) 8 and introduced into an extrusion molding machine 9. Therefore, the twisted conductive wires 1 are untwisted immediately before being passed through the separator 8, and introduced into the extrusion molding machine 9 at a fixed position.

FIG. 2 shows a sectional view of the extrusion molding machine 9, in which the hollow tube 16 is guided into the center hole 4a of the nipple 4, its tip is inserted into the center hole 14 formed in the guide portion 12 of the nipple 4, and its proximal end is inserted into the center hole 14 formed in the guide portion 12 of the nipple 4. is connected to an inert gas source (not shown). On the other hand, each introduced conductive wire 1 is guided to the center hole 4a of the nipple 4, passes through a wire guide groove 18 formed at the tip of the nipple 4, and is further guided into the orifice 10 of the die 6. Note that it is preferable to heat the conducting wire 1 in advance.

Now, when a molten plastic material is supplied from the cylinder 11 (see FIG. 1), this plastic material passes through a passage 20 and is extruded into a passage 21 formed by the guide portion 12 of the nipple 4 and the die 6. . On the other hand, hollow tube 1
Inert gas is blown out from 6. Therefore, the plastic material is formed into a hollow shape and extruded as a plastic tube 22, and the conductive wires 1 are in parallel contact with the inner surface of the tube 22 and run toward the exit of the die. Therefore, the plastic tube containing the conducting wire 1 shown in FIG. 5 is manufactured continuously.

By the way, as mentioned above, when the conducting wires 1 which are twisted together in advance are prepared and the conducting wires 1 are introduced into the extrusion molding machine 9 while removing the twist, uniform tension is always applied to the plurality of conducting wires 1. It can be introduced into the extrusion molding machine 9 in this state. Therefore, even if the introducing speed of the conducting wire 1 is increased, it is possible to prevent the wire from breaking, and therefore it is possible to mass-produce the plastic tube containing the conducting wire.

(Effects of the Invention) According to the present invention, a plurality of twisted conductive wires are introduced into the extrusion molding machine while removing the twist, so that the conductive wires are introduced into the extrusion molding machine at a high speed without breaking the conductive wires. As a result, it is possible to mass-produce plastic tubes containing conducting wires.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an apparatus used in the manufacturing method according to the present invention, FIG. 2 is a cross-sectional view of an extrusion molding machine, FIG. A) and (B) are a side view and a sectional view of the twisted conducting wire, and FIG. 5 is a sectional view of the plastic tube containing the conducting wire. 1---------1 conductor, 2--1--------combined wire wine goo, 5---1--
--- Winding bobbin, 8----- Separator, 9-1-- Extrusion molding machine.

Claims (1)

[Claims] A method for manufacturing a plastic tube containing a conductive wire, in which a plurality of conductive wires are introduced into an extrusion molding machine, and a plastic tube in which the conductive wires are embedded is extruded by the extrusion molding machine, wherein the plurality of conductive wires are twisted together while removing the twist. A method for producing a plastic tube containing a conducting wire, the method comprising introducing the plastic tube into the extrusion molding machine.