JP2017091699A - Manufacturing method of electric core wire cutoff part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method that makes a control on a use amount of an adhesive or the like for cutoff easy, can eliminate inconvenience such as expansion of the electric wire, and can simply perform a cutoff treatment to an electric core wire.SOLUTION: An insulation coating 12 on the innermost side of an electric wire is subjected to intermediate peeling, a hot-melt adhesive 14 for preventing flooding from the core wire is provided on the exposed core wire 11, the core wire 11 provided with the hot-melt adhesive 14 and a core wire part including the insulation coating 12 on both ends of the core wire are covered with a heat-shrinkable tubing 15, and the hot-melt adhesive 14 and the heat-shrinkable tubing 15 are heated, thereby, the hot-melt adhesive 14 is molten and permeated between element wires of the core wire 11 and the heat-shrinkable tubing 15 is shrunk to cover the core wire part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a wire core water-stop treatment unit, and more particularly to a method for manufacturing a water core water-stop treatment unit that blocks water penetrating from a core wire of an electric wire taken out from a casing of an electronic device.

  Conventionally, there is a problem that water enters from the core wire of the electric wire and causes an electrical failure. As a countermeasure against this, the water stop structure shown in Patent Documents 1 and 2 below is adopted.

  FIG. 2 shows the structure shown in Patent Document 1. In FIG. 2, 1 is an electric wire, 1a is a core wire, 1b is an insulation coating, 1c is an intermediate peeled portion, 2 is a low-viscosity silicone resin, and 3 is hot-melted. Heat shrinkable tube. In this example, the insulation coating 1b of the electric wire 1 is peeled off as an intermediate coating, the low-viscosity silicone resin 2 is dropped on the exposed wire core wire 1a (1c), and the intermediate peeled portion 1c is heated with hot melt. Covering with the shrinkable tube 3 and thermally shrinking it are performed.

  FIG. 3 shows a structure shown in Patent Document 2. In FIG. 3, W is a shielded electric wire, 5 is a shield member, 6 is a sheath, 7 is an adhesive, 8 is a hot melt, and 9 is a heat shrinkable tube. . In this example, the sheath 6 of the shielded electric wire W is peeled off with an intermediate skin, the adhesive 7 is infiltrated into the exposed shield member 5, and the heat shrinkable tube is passed through the hot melt 8 thereon. 9 is applied.

JP 2007-287647 A JP 2007-250404 A

  However, when the low-viscosity silicone resin 2 is dropped on the electric wire core 1a in the conventional water-stop treatment structure of FIG. 2, there is a concern that the silicone resin 2 may flow out of the electric wire core 1a (1c). If the amount of the low-viscosity silicone resin 2 is too large, there is a problem that the water-stopped portion becomes thicker than the electric wire 1, and it is difficult to control the amount of the low-viscosity silicone resin 2 to be dropped.

  3 is a simple and reliable structure at low cost, it is effective only for the electric wire W having the shield member 5 and is not suitable for other electric wires.

  The present invention has been made in view of the above problems, and its purpose is to facilitate the control of the amount of adhesive used for water stop, etc., and to eliminate problems such as thickening the wire, and to the wire core wire. It is providing the manufacturing method of the electric wire core water stop processing part which can perform a water stop process easily.

  In order to achieve the above object, a method for manufacturing a wire core water-stopping treatment section according to the invention of claim 1 is characterized in that an innermost insulation coating of an electric wire is peeled off and water is immersed on the exposed core wire. Place a hot melt adhesive to prevent, cover the core wire containing the hot melt adhesive and the core wire portion including the insulation coating on both ends of the core wire with a heat shrinkable tube, and heat the hot melt adhesive and the heat shrinkable tube. Thus, the hot melt adhesive is melted and permeated into the core wire, and the heat shrinkable tube is contracted to cover the core wire portion.

  In the invention of claim 2, the hot melt adhesive and the heat shrinkable tube are heated to melt the hot melt adhesive, and then the shrinkable heat shrinkable tube is adhered to the core wire, and the hot melt adhesive is bonded. The core wire portion is covered by shrinking the heat shrinkable tube while allowing the agent to penetrate into the core wire.

  According to the method for manufacturing a wire core water stop treatment part of the present invention, it is easy to control the amount of adhesive used for water stop, etc., and problems such as thickening the wire can be eliminated. The heat shrink tube is heated at the same time to melt the hot melt adhesive, and the heat shrink tube is shrunk, so the treatment process is simple, and water stop treatment of various wires is possible regardless of the type and shape of the wires. There is an effect that it becomes possible.

Also, when the core wire portion on which the hot melt adhesive is disposed is covered with a heat shrinkable tube and heated, the molten hot melt adhesive penetrates into the wire core wire due to the pressure of the heat shrinkable tube, and the hot melt adhesive is applied to the necessary area. Since the hot melt adhesive can be sufficiently spread and the pressure is applied, the hot melt adhesive is cured, so that there is an effect that the bonding between the strands of the electric wire core wire can be performed uniformly and surely.
In addition, by covering the water-stopping part with a heat-shrinkable tube, the water-stopping part can be reliably shut off from the outside, and water intrusion from the wire core is cut off while ensuring water-stopping performance over a long period of time. It becomes possible to do.

The manufacturing method of the electric wire core water stop processing part which concerns on the Example of this invention is shown, A figure (A) is a figure of the state before a heating, A figure (B) is a figure of the state after a heating. It is a figure which shows an example of the water stop processing structure of the conventional electric wire core wire. It is a figure which shows the other example of the water stop processing structure of the conventional electric wire core wire.

  1 (A) and 1 (B) show a method for manufacturing a wire core water-stopping treatment part of an embodiment, wherein 11 is a wire core wire, 12 is an insulator coating (innermost), and 13 is a cable jacket ( (Sheath), 14 is a hot melt adhesive, and 15 is a heat-shrinkable tube. FIG. 1 shows a portion of the electric wire cable arranged inside the device casing among the electric wire cables drawn out from the electronic device. . The said hot-melt-adhesive 14 is a thermoplastic adhesive which applies the heat | fever of about 120-160 degreeC, is made to fuse | melt and adhere. Moreover, the said heat shrinkable tube 15 uses the thing which an internal diameter shrink | contracts about 40% by heating at 115 degreeC or more.

  The water stop treatment part of the embodiment can be formed by the following method. First, as shown in FIG. 1A, the outer sheath 13 at the end of the cable is peeled to expose the coating 12, and then the innermost insulating coating 12 of the electric wire is peeled to expose the core wire 11. Next, a hot-melt adhesive 14 is placed along the exposed core wire 11 so as to cover the core wire portion including the core wire 11 that has been stripped of the intermediate skin and the insulation coating 12 at both ends of the core wire 11 (the covering 12 at both ends of the exposed core wire). Cover the heat-shrinkable tube 15. Here, the hot melt adhesive 14 is cut into a predetermined length and used. By adjusting this length, it can be adjusted to a predetermined amount.

  When a predetermined temperature is applied to the hot melt adhesive 14 and the heat shrinkable tube 15 in this state, the hot melt adhesive 14 melts and the heat shrinkable tube 15 shrinks as shown in FIG. Thus, the hot melt adhesive 14 penetrates into the gaps between the strands of the core wire 11 by this contraction pressure and hardens, and the core wire portion is covered in an airtight state by the contracted tube 15. The hot melt adhesive 14 is melted and penetrated into the core wire 11 when the tube 15 shrunk after melting is brought into contact with the hot melt adhesive 14 by heating and the shrinkage pressure of the tube 15. The hot melt adhesive 14 can be sufficiently spread to every corner of the wire, and the hot melt adhesive is cured under the contraction pressure. Therefore, the bonding between the strands of the core wire 11 and the bonding of the tube 15 to the core wire 11 are prevented. Surely done.

It should be noted that the sequence of melting and penetration of the hot melt adhesive 14 and contraction of the heat shrinkable tube 15 can be appropriately set by selecting the materials of the hot melt adhesive 14 and the heat shrinkable tube 15 and setting the heating temperature.
In the conventional hot-melt heat-shrinkable tube, the hot-melt penetrates after the heat-shrinkable tube adheres to the core wire, whereas the hot-melt adhesive 14 of the present invention starts to penetrate with heating. It is possible to penetrate deeper and form a reliable water stop structure.

1a, 11 ... wire core wire,
1b, 12 ... Insulation coating (innermost),
9, 15 ... heat shrinkable tube,
13 ... Cable jacket,
14: Hot melt adhesive.

Claims (2)

Strip the innermost insulation coating of the wire, place a hot melt adhesive on the exposed core wire to prevent water from entering the core wire,
Cover the core wire part containing this hot melt adhesive and the core wire part including the insulation coating on both ends of the core wire with a heat shrinkable tube,
By heating the hot melt adhesive and the heat shrinkable tube, the hot melt adhesive is melted and penetrated into the core wire, and the heat shrinkable tube is contracted to cover the core wire portion. Part manufacturing method. After melting the hot melt adhesive by heating the hot melt adhesive and the heat shrinkable tube, the shrinkable heat shrinkable tube is adhered to the core wire,
The method for manufacturing a wire core water-stop treatment section according to claim 1, wherein the heat shrinkable tube is contracted while the hot melt adhesive is infiltrated into the core wire to cover the core wire portion.

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