JPH0525939U - Waterproof sheet for wire connection - Google Patents

Abstract

(57) [Abstract] [Purpose] On one side of an insulating film having an adhesive layer on one side, a waterproof sheet provided with a sealing material while leaving the film edge part on the wire connecting part, (EN) It is intended to provide a waterproof sheet for an electric wire connecting portion which can be covered without covering the finger. [Structure] An insulating film is provided on one side with an adhesive layer that is self-fusing, has an adhesive force to the hand of 50 g / 10 mm or less, and has an adhesive force of the self-fusing surfaces of 250 g / 10 mm or more, It is characterized in that a viscoelastic seal material having a thickness of ⅓ or more of the outer diameter of the electric wire is provided while leaving an edge portion of the insulating film.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof sheet used for waterproofing a wire connecting portion.

[0002]

[Prior Art]

 Waterproofing of the wire connection is essential for ensuring insulation and preventing corrosion of wire conductors and conductor connection fittings. The traditional waterproofing structure for wire connections is to wrap a self-bonding insulation tape over the wire connections. However, in such a structure, it is necessary to wind the self-fusing insulating tape under tension, and the wire connecting portion is bent after each winding of the tape. There is concern about disconnection.

In order to eliminate such absurdity, an adhesive is applied to the entire surface of one side of the insulating film wider than the electric wire connecting portion, and the self-fusing thin piece is adhered to the adhesive surface, leaving four edge portions. It is proposed that the waterproof sheet is wrapped over the wire connection part with the self-fusing flakes facing inward, and the adhesive surfaces of the vertically attached waterproof sheet that are in contact with each other are bonded by pressure welding with a fingertip. (Utility model application publication No. 37-27794).

[0004]

[Problems to be solved by the device]

 However, in the adhesive layer of this waterproof sheet, when the adhesive is a normal adhesive, the adhesive strength to the hand is considerably high, and when the waterproof sheet is wrapped over the wire connection part, When the fingertip touches the adhesive layer, the waterproof sheet deforms following the movement of the finger without separating from the fingertip, sticks to the finger, and wraps the waterproof sheet smoothly around the wire connection part. Sometimes it's difficult.

An object of the present invention is to provide a waterproof sheet, which has a sealing material on one side of an insulating film having an adhesive layer on one side thereof, leaving a film edge on the wire connecting portion. The purpose of the present invention is to provide a waterproof sheet for connecting electric wires, which can be wrapped around a finger without clinging to it.

[0006]

[Means for Solving the Problems]

 The waterproof sheet for electric wire connection of the present invention is self-bonding to one side of the insulating film, the adhesive force to the hand is 50 g / 10 mm or less, and the adhesive force between the self-bonding faces is 250 g / 10 mm. The adhesive layer described above is provided, and the viscoelastic seal material having a thickness of 1/3 or more of the outer diameter of the wire is provided leaving the edge portion of the insulating film. ..

[0007]

[Action]

 Since the seal material is made into a viscoelastic body and a fairly high elastic modulus is given to the seal material, and the thickness of the seal material is made ⅓ or more of the outer diameter of the wire to make it thicker, a waterproof sheet is obtained. It can impart considerable rigidity, and since the adhesive strength of the adhesive layer to the hand is 50 g / 10 mm or less, even if the finger touches the adhesive layer, the waterproof sheet follows the movement of the finger. If a stress of 50 g / 10 mm is applied to the contact area of the finger without following the deformation, the waterproof sheet will detach from the finger. Therefore, it is possible to prevent the waterproof sheet from being attached to the finger.

Further, since the adhesive force between the adhesive surfaces of the adhesive layer is 250 g / 10 mm or more, the contact surface between the adhesive surfaces of the waterproof sheet edge portions can be firmly adhered, and the sealing material It can prevent the food from getting out.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 (A) is a plan view showing an embodiment of the present invention, and FIG. 1 (B) is a cross-sectional view of FIG. 1 (A).

In FIG. 1, reference numeral 1 denotes an insulating film, which is a relatively stretchable plastic film (eg, edging vinyl, polyethylene, thermoplastic elastomer, thermosetting elastomer, etc.), hard plastic film. (Engineering plastics such as polyethylene terephthalate, polybutylene terephthalate, etc.), or plastic films having intermediate properties between them are selected according to the usage conditions of the waterproof sheet. ..

Reference numeral 2 denotes a self-bonding adhesive layer provided on the entire surface of one side of the insulating film 1, the adhesive force to the hand is 50 g / 10 mm or less, and the adhesive force between the self-bonding faces is 250 g. / 10 mm or more. As this self-fusing material, for example, a hot-melt composition such as a styrene-isoprene-styrene copolymer mixed with a resin and, if necessary, an additive is used.

Reference numeral 3 denotes a viscoelastic sheet provided on the surface of the self-bonding adhesive of the insulating film 1 with at least one edge left (in the figure, four edges are left). -It is a rubber material, and its thickness is set to 1/3 or more of the outer diameter of the wire. As the viscoelastic seal material, for example, a material having a considerably high elastic modulus (1 × 10 ⁵ to 10 ⁷ dny / cm ² ) mainly composed of uncrosslinked butyl rubber and silicon rubber is used. The upper limit of the thickness of the viscoelastic seal material is usually 3 times the outer diameter of the wire.

The waterproof sheet for electric wire connection portion of the present invention is used for electric wires (1 cm or less) having a relatively small outer diameter, and the thickness of the viscoelastic seal material is usually 1.0 mm or more. Becomes

In order to waterproof the electric wire connecting portion, particularly the electric wire branch connecting portion, with the waterproof sheet of the present invention, the waterproof sheet of the present invention is applied with the viscoelastic seal material 3 facing inward. Of the viscoelastic seal material 3 at the center line of the viscoelastic seal material 3 and contact the wire connection part. At this contact point, the waterproof sheet is bent and attached vertically on the wire connection part. Then, the self-bonding adhesive surfaces of the edges of the waterproof sheet are brought into contact with each other. Next, the vertically attached waterproof sheet is pressed by a mold to pressurize the viscoelastic seal material. In this case, since the edge portion of the vertically attached waterproof sheet is sealed by the self-bonding adhesive with an adhesive force of 250 g / 10 cm, it is possible to prevent the viscoelastic seal material from escaping. .

[0015]

[Effect of the device]

 The waterproof sheet for electric wire connection portion of the present invention is constructed as described above, and the thickness of the viscoelastic seal material is made thicker than 1/3 of the outer diameter of the electric wire to deform the waterproof sheet. Even if the finger touches the adhesive layer, the stress acting on the contact point is 50 g / 10 mm as described above because the adhesive layer has a small adhesive strength to the hand of 50 g / 10 mm. The waterproof sheet cannot be deformed by the above small stress, and the waterproof sheet cannot be deformed by the small stress. It is possible to eliminate the clinging to the fingers of.

Further, the edge portion of the waterproof sheet can be adhered with a large adhesive force of 250 g / 10 mm or more to cover the electric wire connecting portion, and the press can be prevented from escaping the viscoelastic seal material. I can do it. Furthermore, the flexibility of the insulating film of the waterproof sheet can be sufficiently maintained, and the edge portion of the insulating film of the waterproof sheet can be well adhered to the outer surface of the electric wire coating layer by the adhesive layer.

[Brief description of drawings]

FIG. 1A is a plan view showing an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line B-B in FIG.

[Explanation of symbols]

 1 Insulating Film 2 Self-Fusing Adhesive Layer 3 Viscoelastic Seal Material

Claims (1)

[Scope of utility model registration request] 1. An insulating film, which is self-fusing on one side and has an adhesive force to the hand of 50 g / 10 mm or less,
An adhesive layer having a self-bonding surface adhesive strength of 250 g / 10 mm or more is provided, and a viscoelastic seal material having a thickness of 1/3 or more of the outer diameter of the wire is provided on one side of the insulating film at the film edge portion. The waterproof sheet for the electric wire connecting portion, which is provided by leaving.