JPS5819814A - Tape lapped electric 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] This invention relates to improving the performance of tape-wrapped electric wires.

In general, with tape-wrapped wires, there is no orientation in the insulation layer around the core wire, and an insulation layer of uniform thickness is obtained, and even if cracks or cracks occur in the insulation layer, it will not lead to fatal damage like extruded wires. Because of its high reliability, it is widely used as pink wire, equipment wiring wire, etc. Particularly in recent years, paired wires with uniform characteristic impedance that utilize the uniformity of the insulating layer of tape-wrapped wires have come into widespread use. In this type of pair wires, there is a trend toward lower characteristic impedance to prevent disturbances as equipment becomes more sophisticated, and a simple parallel pair wire or live bare wire is no longer able to meet the requirements.

Therefore, as shown in FIG.
A plurality of layers of plastic tape 3 are wrapped around each other, formed into a pair of wires before the adhesive hardens, and tension is applied to the pair of wires to increase the distance between the core wires 1 as shown in Figure 2.
The characteristic impedance between the lines was kept as low as possible. 'However, in such a structure, the distance X between the core wires 1 is not necessarily uniform along the longitudinal direction of the pair of wires, and the signal transmission characteristics are particularly unsatisfactory, so it is difficult to maintain the distance between the core wires 1. This had the disadvantage that pair wires had to be bonded together in order to do so. Moreover, since it has a woven structure, the dielectric strength and cut-through resistance are not uniform, and the wire is unreliable as an electric wire for wiring devices.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tape-wrapped electric wire that can eliminate the above-mentioned conventional drawbacks, improve electrical and mechanical strength, and obtain a desired characteristic impedance.

Therefore, according to the present invention, there is provided a core wire, a first plastic tape wrapped around the outer periphery of the core wire without adhesive, and a tape itself wrapped around the outer periphery of the first plastic tape. and a second plastic tape coated with a thermoplastic adhesive resin having a melting point lower than that of the tape-wrapped electric wire. At this time, pigments can be mixed in the thermoplastic adhesive resin applied to the second plastic tape to give different colors to the wires. In this case, the second plastic tape can be made transparent and the thermoplastic adhesive If the resin and pigment are applied to the inside of the second plasti or cutape, the adhesive and the pigment will be protected by the second plasti or cutape, and the color and gloss will not be lost over many years, which is advantageous.

Additionally, the thermoplastic adhesive applied to the second plastic tape can also be applied to the outside of the second plastic tape, which is advantageous in that it provides adhesion between the wires when forming the wire pair. In addition, since the first plastic and tape are not bonded to the second plastic and tape, the stripping property of the wire sheath is extremely good.

Next, the present invention will be explained in more detail with reference to FIG.

In FIG. 3, a tape-wrapped electric wire 5 according to the present invention has three layers of a first plastic tape 7 without adhesive applied to the outer periphery of a core wire 6, and a thermoplastic adhesive resin 8 is applied to the inner side of the outer periphery. The second plastic tape 9 is wrapped in two layers. This second plastic tape 9 is wrapped to prevent the first plastic tape 7 from coming off and to color it. Therefore, the thermoplastic adhesive resin 8 is mixed with a pigment that exhibits a desired color.

According to the tape-wrapped electric wire 5 of the present invention having such a structure, since the core wire 6 and the first plastic tape 7 are not bonded, the stripability of the core wire 6 is extremely stable and the connection work is extremely simple. Handling it next to it allows you to get wires that are easy to use. The thermoplastic adhesive resin 8 applied to the second plastic tape 9 is a second plasti,
If it is applied to the outside of the tape 9, the first plastic tape and the second plastic tape will not be bonded together, resulting in even better stripability. In this way, when the thermoplastic adhesive resin 8 is applied to the outside of the second plastic tape 9, in addition to the above-mentioned improvement in stripping properties, when forming a pair of wires, the wire pair can be heat-treated. This is convenient because the tape-wrapped wires forming the pair are bonded to each other, making it easier to handle and having stable characteristics.゛The tape-wrapped electric wire 5 according to the present invention has a characteristic impedance of 65±5 (Ω) and a core wire diameter of 0.4 mm.
In order to obtain a pair of wires, a first plastic tape 7 made of polyethylene terephthalate with a thickness of 16 μm is placed around the outer periphery of a core wire 6 made of tin-plated annealed copper wire with a diameter Q of 4 mm.
was wound in a 2/3 lap manner to form a first plastic tape layer having three layers in cross section. Then, apply 10. 12 coated with thermoplastic adhesive resin 8 made of pm thick PVC resin.
A second plastic tape 9 with a thickness of μm is wrapped in a 1/2 wrap so that a second plastic layer with a double cross-section is formed, then heat treated to promote uniform adhesion, and left to cool outside. A tape-wrapped electric wire with a diameter of 0.58 mm was obtained.

When a pair of wires was obtained by simply twisting the tape-wrapped wires 5 together, the characteristic impedance was 66Ω.

Therefore, the wire pair obtained by the structure shown in FIG. 2 has an outer diameter of 0.70 mm and is coated with adhesive after being twisted, even though the number of wires is at least less than that of the tape-wrapped wire according to the present invention. Although the characteristic impedance is at least 68Ω even if the bare wires are bonded with tension applied to each other with the distance between core wires set to the minimum, the tape-wrapped wire according to the present invention has the required performance. The outer diameter of the wire has been reduced by about 17%, and the characteristic impedance can be reduced by around 3% by simply twisting the wires together without applying tension or gluing the wire pairs together. In addition, the dielectric strength is improved by about 23%, the force and toss-through resistance are improved by about 20%, and uniform characteristics can be obtained over the entire circumference.

As described above, according to the present invention, the main insulation around the outer periphery of the core wire is formed by a first plastic tape to which no adhesive is applied, and a thermoplastic adhesive resin is used to hold or color the first plastic tape. By applying the second plastic tape coated on the outer periphery of the first plastic tape, it is possible to reduce the outer diameter of the ninth wire to obtain the necessary properties, and at the same time, it is possible to reduce the outer diameter of the ninth wire to obtain the necessary properties. Not only can the through resistance and resistance be greatly improved, but when the tape-wrapped wire according to the present invention is used as a pair of wires, it can economically achieve low characteristic impedance characteristics without applying tension or gluing to the pair of wires. The effect that can be obtained is obtained. Moreover, the pair wires using the tape-wrapped wires according to the present invention have uniform dielectric strength, cut-through resistance, characteristic impedance, and cord characteristics, so stable electrical characteristics can be obtained even when used for relatively high frequencies. .

Furthermore, according to this invention, the stripping properties are extremely good and stable, and the outer diameter of the wire is small, so it is also possible to increase the number of strands per unit cross-sectional area when forming a multi-core cable. Become.

It should be noted that this invention is not limited to the embodiments, and it goes without saying that various changes can be made within the scope of the idea of this invention.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a conventional pair of tape-wrapped electric wires, and FIG. 3 is a cross-sectional view of a tape-wrapped electric wire according to the present invention. 5: Tape wrapped electric wire, 6: Core wire, 7: First plastic tape, 8: Thermoplastic adhesive resin, 9: Second plasti, tape. Patent applicant Jun Kosha Co., Ltd.

Claims (1)

[Claims] 1) A core wire, a first plastic tape without adhesive wound around the outer periphery of the core wire, and the tape itself wrapped around the outer periphery of the first plastic tape. and a second plastic tape coated with a thermoplastic adhesive resin having a lower melting point than the melting point of the tape-wrapped electric wire. 2. The tape-wrapped electric wire according to claim 1, wherein the thermoplastic adhesive resin applied to the second plastic tape contains a pigment. 3) In the tape-wrapped electric wire according to claim 1 or 2, the thermoplastic adhesive resin applied to the second plastic tape is applied to the inside of the second tape. #11 tape-wrapped electric wire. 4) In the tape-wrapped electric wire according to any one of claims 1 to 3, the thermoplastic adhesive resin applied to the second plastic tape is applied to the outside of the second tape. Features tape-wrapped electric wire. 5) The tape-wrapped electric wire according to any one of claims 1 to 4, wherein the second plastic tape is a transparent tape.