JPH01605A - 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 [Field of Industrial Application] The present invention relates to an insulated wire, and particularly to an insulated wire for high voltage wiring used for wiring a high voltage circuit to a cathode ray tube electron gun of a television.

[Conventional technology]

Conventionally, an insulating coating made of cross-linked polyethylene was formed on the outer periphery of the C1 conductor as a high-voltage wiring 1@edge wire (hereinafter referred to as high-voltage lead wire) used for high-voltage circuit wiring to a television's cathode ray tube electron gun. The first layer is coated with ethylene on the outer periphery of the first layer.

A 21st coated high-voltage lead wire having an outer jacket formed of a compound mainly composed of vinyl acetate, vinyl chloride terpolymer or chlorinated polyethylene, vinyl chloride copolymer (
For the nine toes, Japanese Patent Publication No. 51-8465) is used.

[Problem that the invention seeks to solve]

Needless to say, this type of high-voltage lead wire requires reliability in terms of withstand voltage above all else. Since it is voltage, it is naturally pressure (hereinafter written as ■).

), reliability at high voltages of Toυ, (■) is required. Conventionally, high-voltage lead wires in televisions and the like have been used with some leeway in withstanding high voltages, and have a negative (hereinafter referred to as (-)) voltage.

), and -r did not pose any particular problem.

However, as TV screens have become larger, the picture quality has become higher definition, and the quality has become higher, the usage conditions of high-voltage lead wires have changed, and there is no margin for withstand voltage. The reliability of C is a problem.

[Means for solving problems]

The present invention addresses the conventional problem that this type of high-voltage lead wire has a difference between the withstand voltage (2) and (2).
Regarding the reliability of conventional high-voltage lead wires, when focusing on the withstand voltage of The first layer of polyethylene coating has a density of 0.
94 or above.

It is characterized by being made of polyedele having physical properties of 0.97 or higher, a melt index of 2 or higher, 0.1 or higher, and a molecular weight distribution of 8 or higher and 15 or lower. Examples of the present invention will be described below.

〔Example〕

FIG. 1 shows a cross-sectional structural diagram of an insulated wire of the present invention.

On the outer periphery of the conductor 1, an insulating coating 2 of a first layer coating 2 made of a cross-linked compound mainly composed of polyecurate is applied; Alternatively, it has a structure in which the second layer coating 5 is made of a bio-compounded copolymer of chlorinated polyethylene and vinyl chloride.

Six types of insulating polyethylene shown in Table 1
Insulating coating of layer coating and two types of compositions P and QK shown in Table 2
A sample of an insulated wire having the structure shown in Table 3 was prepared by combining the outer covering of the second layer covering according to the above.

Seven types of samples were produced, and Table 4 shows the coating configurations of samples 1 to 7 based on combinations of first layer coating and second layer coating.

Table 1 Table 2 Table 3 Table 4 Sample No. 1 to No. 0 of each of the prototype electric wires in Table 4.
7 was tested for withstand voltage. The withstand voltage test method was as follows: 15 m of each wire for sample No. 1 to N007.
Prepare 100 bundles of wire lengths, immerse these sample wire bundles in water, and determine the withstand voltage of θ for each sample N.
Apply a negative voltage of ■80KV to the wire conductors of O,1 to N007, and apply the withstand voltage of ■ to each sample N01.
A test method was used in which a positive voltage of 8Off was applied to the wire conductors No. 1 to No. 7, and the positive and negative voltages were maintained for 10 minutes, respectively, and then the presence or absence of dielectric breakdown was examined. Table 5 shows the withstand voltage test results. The numbers in the table are
This is the number of defective bundles as a result of testing 100 bundles. In other words, for example, sample N015 has 100 bundles of 1 x 80Kv.
The figure shows the number of defects in which dielectric breakdown occurred for eight bundles when a positive voltage was applied.

Table 5 As can be seen from the withstand voltage test results shown in Table 5, the number of defects in the e withstand voltage was small in all of the samples No. 011 to No. 7 in which the first layer was coated with insulating polyethylene A to F, respectively. On the other hand, the 0 withstand voltage is the insulator polynitele y B
* Sample No. 3 with ↓9th 1/ii overturning applied to C and D
, there are many defects in NO, 4, NO, 5? vinegar,
Poor reliability.

In addition, samples N016 and N007, whose first layer was coated with insulating polyethylene E and F, performed well in the main withstand voltage test, but the high-voltage cables for television receivers shown in outline in Figures 2a and b The U.S. has established passing criteria as
mderwrits1s Laboratories
*Inc.

UL standard collection 8ubj・l! The high pressure cut-through test shown in t 758 was conducted and the result was a failure.

In the high-voltage cut-through test, as shown in Figures 2a and b, the central part of a high-voltage electric wire, in which a conductor 1 is coated with a first layer coating 2 and a second layer coating 3, is cut at the tip of a groove in a metallic channel steel 4. The wire is supported under pressure at s7, and a load 5 is applied to both ends of the wire, and the wire is stored in a constant temperature oven 8, and the wire is heated at a temperature of 105° C. to forcibly deform the wire while being heated at a working voltage of 1. 5
A voltage twice as high as that of the DC power source 6 is applied between the electric wire and the metallic channel steel 4, and the standard value test is such that the electric wire must not cause dielectric breakdown at the tip 7 of the metallic channel steel 4. be.

The remaining insulated wires of Sample No. 1 and Sample No. 002, each coated with a first layer of insulating polyester 7A&C and coated with compositions P and Q, all failed in the high voltage cut-through test. It was confirmed that there were no problems with this product, and that it had particularly excellent withstand voltage characteristics.

In addition, when using composition P or composition Q for the outer covering,
As described in the above-mentioned Japanese Patent Publication No. 51-8465, in order to pass the flame retardancy test specified in the UL standard collection, the following materials were used: Sample No. 1 and Sample No.
Both insulated wires No. 2 had good flame retardancy and no problems.

In addition, 7 insulator polyesters were polymerized by the Degra method, ■ Sample No. 005, which had a large number of defects in the withstand voltage test.
The insulator polyethylene D is prepared by the Phillips method #)!
It is combined. Seven other insulators polyethylene B,
C and P are both obtained by Degla's method B, which uses 19-polymerized products by a high-pressure method.

〔Effect of the invention〕

As explained above, in the insulated wire of the present invention, by specifying the physical property values of the insulating polyethylene of the first layer coating applied to the outer periphery of the conductor within the optimal range, This product provides a reduced amount of insulated wire, and can withstand the strict voltage resistance requirements for insulated wires used in high-voltage wiring, especially as TV screens have recently become larger and the image quality has become higher quality. It is applied to highly reliable insulated wires, and its effects are great.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural view of an insulated wire according to the present invention, and FIGS. 2a and 2b are schematic diagrams of a high-voltage cut-through test device for electric wires. 1... Conductor 2... First layer coating 3... 21st-coating 4... Metallic channel steel 5... Load 6... DC power source 7... Tip portion 8... Constant temperature oven patent applicant ``Sumitomo Electric Industry Co., Ltd.

Claims (1)

[Claims] The outer periphery of the conductor is coated with a first layer of a crosslinked compound mainly composed of polyethylene, and a compound mainly composed of ethylene, vinyl acetate, and vinyl chloride terpolymer or a copolymer of chlorinated polyethylene and vinyl chloride. In an insulated wire coated with a second layer of a compound mainly composed of
The layered polyethylene has a density of 0.94 or more. 0.97
Below, the melt index is 2 or less. 0.1 or more, molecular weight distribution 8 or more. An insulated wire characterized by being made of polyethylene having physical properties of 15 or less.