JPS60117510A - Method of producing foamable insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Backbone and Objectives of the Invention] The present invention relates to a method of manufacturing a foam insulated wire.

Conventionally, as a method for controlling the capacitance of a foam insulated wire, there is a method shown in Japanese Patent No. 7384.17 (Japanese Patent Publication No. 11871/1987).

Specifically, in the extrusion coating process for foamed insulated wires, a water tank that can be moved in the running direction of the wire is provided near the exit of the extruder, and this moving water tank is automatically controlled by a one-piece motor to control the foaming rate. This is a method of manufacturing a foam insulated wire to be adjusted.

However, in this conventional method, the foaming rate is controlled only by moving the movable water tank, so that the response speed is slow and the fluctuations in capacitance during extrusion operation are often not fully absorbed.

In particular, at the beginning of extrusion, the injection of foaming gas was unstable, and even if the capacitance n was not present, it was not desirable.

The object of the present invention is to eliminate the drawbacks of the prior art as described above, and to manufacture an excellent foam insulated wire that minimizes the portion of capacitance failure at the start of extrusion and during extrusion operation, and minimizes the generation of waste. The purpose is to provide a method.

[Summary of the Invention] That is, the gist of the present invention is to measure and monitor the capacitance of an extrusion-coated foam insulated N wire, which consists of an extruder and a cooling water tank, such as a moving water tank or the like following the extruder. , if the capacitance is different from the set value, in the method for manufacturing foam insulated wire that adjusts the position of the moving water tank, the static A method of manufacturing a foam insulated wire is characterized by suppressing excessive fluctuations in capacitance and bond.

[Example] Next, an example of the manufacturing method of the present invention will be further described with reference to the attached drawings.A conductor sent out from a conductor sending device (not shown) is insulated with foam insulation on its outer periphery by an extruder 2. body 1
is coated, enters the moving water tank 4, starts cooling, is further cooled in the cooling water tank 5, and capacitance monitor head 7
, is taken up by a take-up capstan 6, and wound up by a winding device (not shown) to complete manufacturing.

The capacitance of the foam insulated wire detected by the capacitance monitor head 7 is displayed on the capacitance monitor 11, and if there is a difference from the set value, the capacitance of the foam insulated wire is detected by the movable aquarium drive motor 1.
7 and control the moving aquarium 4 back and forth.
Controls capacitance.

The movement range of the conventional mobile water tank 4 is limited to the limit switch 13.
However, in the case of this embodiment, limit switches 15 and 16 for water flow control are further provided between limit 1 and switches 13 and 14, and if the capacitance fluctuates too much, A signal is taken out from the capacitance HL monitor 11, this signal is input into the comparison control circuit 10, an output signal is output according to the deviation from the set value of the capacitance value, and the cold IJl water 4@5 and the moving Water tank 4 cooling water solenoid valves 9 and 8
It opens and closes the capacitor, adjusts the amount of water, and controls the capacitance ω.

In other words, as long as the moving water (1y4) is between the limit switches 15 and 16, the water volume is not controlled, but the conventional position adjustment of the moving water tank 4 is performed. For example, when the moving water tank 4 moves forward from limit 1 to switch 15. (The capacitance becomes smaller I
ζ time), the cooling water tank 5 is adjusted depending on the size of the capacitance deviation.
By increasing the amount of water in the moving water tank 4, the capacitance is increased, and the moving water tank 4 is always connected to the limit switches 15 and 1.
It is something that is being carried out between 6 and 6.

On the contrary, the capacitance increases and the movable water tank 4 moves backward.
When the limit switch 16 is reached, the amount of water is reduced and the movable water tank 4 is moved forward, thereby stabilizing the capacitance.

Note that, in order to prevent damage to the coating, the amount of cooling water in the movable water tank 4 must be slightly replenished without completely closing the solenoid valve 8.

Cold 7JI water #05 has a total length divided into 4 or more zones.
Preferably, the amount of water is controlled from O to a maximum.

In this case, the water amount control method is such that when the capacitance becomes small (when the mobile water tank 4 moves forward), the cold IJl water top 5
The water is increased from the zone near the capacitance monitor head 7 of , and when water n' is incorporated, the water volume of the next zone is increased, and the water volume is increased sequentially toward the moving water 4 @ 4 side. [It's good.

On the other hand, when the capacitance becomes large, it is sufficient to reduce the amount of water from the zone near the movable water tank 4 and make adjustments sequentially toward the capacitance monitor head 7, thereby reducing the change in capacitance. can respond quickly.

[Effects of the Invention] As explained above, in the manufacturing method of the present invention, small capacitance changes can be controlled by adjusting the position of the moving water tank, or large capacitance changes can be controlled by adjusting the position of the moving water tank. By controlling the amount of water, it is possible to respond quickly, thereby reducing defects at the beginning of extrusion and also eliminating defects during extrusion, ensuring quality of insulated wires, It is effective in improving yield and has great industrial value.

[Brief explanation of the drawing]

The accompanying drawings are schematic illustrations showing one embodiment of the manufacturing method of the present invention. 1: Foamed insulated wire, 2: Extruder, 3: Crosshead, 4
: Mobile water tank, 5: Cooling water tank, 6: Pick-up capstan, 7
: Capacitance monitor head, 8: Mobile water phase water supply solenoid valve,
9: Cooling water tank water supply solenoid valve, 10: It calibration sub-control circuit 11: Capacitor dryer, 12: Limit switch operation plate, 13: Limit switch (BO I limit), 14: Limit switch (eyepiece), 15 .16: Limit switch (
(for water distance adjustment), 17: Mobile water tank drive heater.

Claims (1)

[Claims] Measure the capacitance fil of the extrusion-coated foam insulated wire, which consists of an extruder, a moving water tank connected to it, and a cooling water tank.
Monitor and if the capacitance is different from the set value, adjust the water volume of the mobile water tank and/or cooling water tank in the method of manufacturing foam insulated wire that adjusts the position of the mobile water tank. A method of manufacturing a foam insulated wire characterized by suppressing excessive fluctuations in capacitance.