JPH0640445B2 - 4 Fluoroethylene resin insulated flat cable and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flat cable, and more particularly to a flat cable using tetrafluoroethylene resin, in which the individual cores can be easily identified, and a manufacturing method thereof. Here, the wire core is composed of each conductor and insulation around the conductor.

<Prior Art> Recently, the demand for flat cables composed of a large number of parallel conductors has increased along with the development of electronic devices, but due to the high density of electronic devices, the flat cables themselves are required to have heat resistance. A flat cable using an ethylene tetrafluoride resin tape as an insulating material is evaluated to have high reliability and good workability for terminal processing.

<Problems to be Solved by the Invention> Since tetrafluoroethylene resin has a low activation energy on the surface due to its molecular structure and cannot be printed by ordinary printing, tetrafluoroethylene resin is used as insulation for flat cables. When used, it was difficult to give identification of each core.

Therefore, a method is considered in which a predetermined portion for identifying the core of the wire on the surface of the flat cable is subjected to characters, symbols, colors, etc. using an ink containing a pigment and a fluororesin as main components, and then the ink is baked. However, since this ink has poor wettability when applied to the surface of tetrafluoroethylene resin and the ink is repelled by firing, and it is dispersed by firing, it is necessary to add fine characters and symbols. It was difficult.

<Means for Solving the Problems> As a result of intensive studies for solving the problems in the above-described conventional techniques, the present invention has an excellent effect of identifying each core by utilizing a porous tetrafluoroethylene resin tape. Succeeded in getting a flat cable.

That is, as shown in FIG. 1 (a), when the unsintered porous 4-fluoroethylene resin tape 1 is printed with an ink containing a color pigment, the pigment 2 does not enter the inside of the porous hole. Is printed with. 3 is a porous portion in which no pigment is contained.

Therefore, when this is compression-molded, it becomes as shown in FIG. 1 (B), and the ink is compressed and sealed in the internal holes to be in the trap state. When this is fired, it becomes as shown in FIG.

By utilizing such a technique, the present invention was able to obtain a cable having a function of identifying each core even though it is a flat cable made of tetrafluoroethylene resin tape that is difficult to print, and its outline is as follows. is there.

(Claim 1) A plurality of parallel-arranged conductors are sandwiched between two upper and lower tetrafluoroethylene resin tapes, and the upper and lower tapes are joined to each other. On one inside or outside of the tetrafluoroethylene resin tape, a printing tape obtained by printing the above-mentioned porous tetrafluoroethylene resin tape with a colored paint is used so that the printed surface is in contact with the tetrafluoroethylene resin tape. A flat cable which is placed on the surface and sintered and integrated so that the printing ink can be identified by being enclosed in the porous material.

(Claim 2) While advancing a plurality of conductors arranged in parallel at a predetermined interval, two ordinary unsintered tetrafluoroethylene resin tapes are fed so as to sandwich them from above and below, and unsintered. While printing a porous tape of tetrafluoroethylene resin through a printing means, supply it to the inside or outside of at least one of the unsintered tetrafluoroethylene resin tape so that the printing surface is in contact with the tape. After press-molding these with a heat-molding roll, they are introduced into a sintering furnace and the tetrafluoroethylene resin tapes are sintered to completely integrate the respective tapes with each other, and the core identification printing ink is applied to a porous tape. This is a method for manufacturing a flat cable that is sealed in a porous body.

<Function> According to the present invention, the insulating film is two sheets of tetrafluoroethylene resin insulating tape similar to the conventional one, and printed tetrafluoroethylene in which the printing ink for wire core identification is enclosed in the pores. By having a resin tape, printed characters, patterns, and symbols are hard to erase, the identification effect is sufficient, and also
Since the identification layer is not particularly thick, there is no restriction on the use of the electric wire thickness. And the manufacturing method can be easily implemented without increasing the number of steps.

<Example> An example shown in the drawings will be described below. Fig.2-1
2-2 and 3, conductors 11 are arranged in parallel at a predetermined interval (for example, 0.28 mmφ silver-plated copper wire).
Is two sheets of unsintered tetrafluoroethylene tape 12,12
It is sandwiched between and is commonly covered. Further, the porous unsintered tetrafluoroethylene resin tape 13 has a colored surface 14 on the inside (Fig. 2-1) or outside (Fig. 2-2) of the unsintered tetrafluoroethylene resin tape. Is provided in contact with the unsintered tetrafluoroethylene resin tape, and is integrated by molding and sintering.

Next, the manufacturing method will be described below in order to obtain the product shown in FIG. 2-1. The conductors 11 (for example, 0.28 mmφ silver-plated copper wires) arranged in parallel at a predetermined interval are sent out from the reel 15 and are advanced through the guide rollers 16.

On the other hand, unfired porous tetrafluoroethylene resin tape 13
(Porosity 20 to 40% by weight) is sent out from the reel 19, and printing is performed on a predetermined portion through a printing means 20 such as an offset printer to compress (compression ratio 15 to 40).
%) It is used as a printing tape, is dried in a drying oven 21, is advanced through a guide roller 22, and is supplied to one surface of the plurality of conductors 11 described above. At the same time, the printing tape is wrapped inside, and unsintered tetrafluoroethylene resin tapes 12 and 12 are respectively supplied from the reel 17 from both upper and lower sides, and are advanced through guide rolls 18, and these tapes are heated and pressed. The tape is molded by 23 and closely adheres to the surface of the conductor without any gap, and the tapes form a common coating and enter the sintering furnace 24.

In the sintering furnace 24, the tetrafluoroethylene resin is sintered at a temperature higher than the sintering temperature, for example, 370 to 400 ° C. Here, the respective tapes are joined together to form a flat and good flat cable without causing uneven shrinkage. In addition, since the pigment printed on the printing tape and entering the holes is completely shielded from the outside by the tetrafluoroethylene resin tape, it does not cause oxidative decomposition or flow, and the core of the wire can stay in a high-temperature atmosphere for a long time. The identification function is perfect.

In the above description, the example in which the printing tape is supplied inside is described, but the example in which the printing tape is supplied outside can be similarly performed.

<Effect of the Invention> The tetrafluoroethylene resin insulation flat cable thus obtained has a plurality of conductors 11 as shown in FIG.
Is the same as the conventional one, but two tetrafluoride ethylene resin tapes 12
In addition to being insulated, the specified portion is printed with colored tetrafluoroethylene resin printed with colored ink such that characters, symbols, and patterns are printed without being exposed to the outside to identify the core, and at high temperature. Even if there is no discoloration or flow, the core identification effect can be obtained and a highly reliable flat cable can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a change of a porous tetrafluoroethylene resin tape used in the present invention by printing heat treatment, and FIG. 2 is a cross-sectional view showing an example of a tetrafluoroethylene resin flat cable according to the present invention. The figure is a schematic illustration of an example of the method of the present invention. 1; Unsintered Porous 4 Fluoroethylene Resin Tape 2; Pigment 3; Pigment-Free Porous Part 11; Conductor 12; Unsintered 4 Fluoroethylene Resin Tape 13; Porous 4 Fluoroethylene Resin Tape 14; Colored surface 23; Thermocompression bonding roll 24; Sintering furnace

Claims (2)

[Claims] 1. A tetrafluoroethylene resin-insulated flat cable in which a plurality of parallel-arranged conductors are sandwiched between two tetrafluoroethylene resin tapes from above and below for insulation, and the upper and lower tapes are joined together. The inner surface or outer surface of at least one side of the tetrafluoroethylene resin tape, the printed surface of the tape obtained by subjecting one side of the porous tetrafluoride ethylene resin tape to line core identification printing processing is changed to the tetrafluoride ethylene resin tape. A tetrafluoroethylene resin-insulated flat cable, characterized in that the printing ink for core identification is encapsulated in the porosity of the porous tetrafluoride ethylene resin tape, which is attached by facing and is integrated by sintering. 2. While advancing a plurality of conductors arranged in parallel at a predetermined interval, two ordinary unsintered tetrafluoroethylene resin tapes are supplied so as to sandwich the conductors from above and below, While printing a porous tape of unsintered tetrafluoride ethylene resin through a printing means for core identification printing, the printing surface is in contact with the inside or outside of at least one of the unsintered tetrafluoride ethylene resin tapes. In this way, these tapes are press-molded with a heat-molding roll and then sintered in a sintering furnace to completely integrate the tapes with each other, and the core-identification printing ink is placed inside the porous tape. A method for producing a tetrafluoroethylene resin insulated flat cable, which is characterized by being enclosed.