JPS638351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a rubber tube having rubber elasticity is mechanically enlarged on the surface of a cold-shrinkable rubber tube, and the expanded state is maintained until use. The present invention relates to a holding method in which a tape-like material that can be easily peeled off without using a rubber tube to shrink the rubber tube is wound and bonded in a spiral shape.

Rubber or plastic pipes that can be shrunk by heating are well known and are used for a variety of purposes, but they have the drawback of requiring a heat source such as fire and the drawback that the pipes cannot be used in locations where fire cannot be used. are doing.

On the other hand, cold-shrinkable rubber tubes that are mechanically expanded rubber tubes with rubber elasticity are also known, but a holding method that allows the rubber tubes to be held in an expanded state and easily contracted during use has not yet been developed. At present, no sufficient method has been developed. For example, a holding method has been proposed in which a rigid tape-like material that is not easily deformed by the contraction force of the rubber tube is inserted into the inner surface of a contractible rubber tube in a spiral shape. When the tape-like material is attached to a conductor connection part and pulled out from one end, the tape-like material becomes entangled with the connection part and the like, so that the tape-like material cannot be removed smoothly. In addition, in such applications, it is desirable that the connection part and the rubber tube are bonded or sealed, but it is also possible to form a material with adhesive or sealing ability on the inner surface of the rubber tube in advance. It is also practically difficult to form the tape-like material in advance on the joint because it cannot be removed due to adhesion, and therefore good adhesion or sealing effect between the joint and the rubber pipe cannot be expected. There are also drawbacks.

The present invention relates to a holding method proposed based on a novel concept of expanding and holding a cold-shrinkable rubber tube, which is a mechanically expanded rubber tube having rubber elasticity, on the surface side of the rubber tube. The gist of this is that a tape-like material capable of resisting shrinkage force is spirally wound and adhered to the surface of a cold-shrinkable rubber tube that is mechanically expanded.

The contents of the present invention will be specifically explained below with reference to the drawings. In FIG. 1A and FIG. 1B, 1 is a cold-shrinkable rubber tube that is made by mechanically expanding a rubber tube that has rubber elasticity to give it cold-shrinkability, and the rubber tube 1 has rubber elasticity at room temperature. A tube-like object (including a branch pipe) mainly made of rubber is expanded using an expanding means such as a jig or applying internal pressure, and the tube-like object is made of, for example, butyl rubber or neoprene rubber. Therefore, even a tubular material made of a blend of rubber and plastic can be used in the present invention as long as it has rubber elasticity at room temperature.

In order to prevent shrinkage of the cold-shrinkable rubber tube 1, a tape-like material 2 is adhesively fixed to the outer surface of the rubber tube 1 and is not easily deformed by the contraction force of the rubber tube 1, that is, can resist the contraction force. The tape-like material 2 is spirally wound and bonded to the outer surface of the rubber tube 1 as shown in the figure.

The material, thickness, and width of the tape-like material 2 are selected depending on the shrinkage force of the rubber tube 1, and are designed to have at least a mechanical strength that can withstand the shrinkage force.

Similarly, the adhesive force between the tape-like material 2 and the rubber tube 1 is set to have an adhesive strength that will not peel off due to the shrinkage force of the rubber tube 1, and the tape-like material has a wall-opening force that can at least withstand the shrinkage force. It is designed to have an adhesive force that acts perpendicular to 2.

The tape-like material 2 is designed to have the mechanical strength as described above, and is made of a thermoplastic heat-sensitive adhesive resin, such as an ethylene-vinyl acetate copolymer, which itself can be thermally bonded to the rubber tube 1. , molded from polyethylene resin, etc. are used. In this case, the thickness of the tape-like material 2 is approximately 0.3 to 5
mm, and the width is designed to be approximately 3 to 50 mm.

When such a thermally bondable tape-like material 2 is used, for example, a core material is placed inside the shrinkable rubber tube 1, and the side edges of the tape-like material are butted against each other on the surface (Fig. 1B). (see Fig. 2), or by winding them into a spiral shape so as to partially overlap them (see Fig. 2), and then heating to thermally bond the tape-like material 2 and the rubber tube 1 to a state where they can be peeled off at room temperature. Thereafter, by removing the core material, a rubber tube 1 that is prevented from shrinking is obtained. Note that the tape-like material 2 wound in a spiral shape does not necessarily need to be butted or overlapped as shown in the figure, and the mechanical strength of the tape-like material 2 and the adhesive force with the rubber tube 1 are determined by the Of course, as long as the material has enough rigidity to withstand shrinkage force, it may be rolled and bonded with a gap, and the tape-like material 2 and the rubber tube 1 may be bonded together using the tape-like material as described above. In addition to heating the tape-like material 2 after winding it, the surface of the tape-like material 2 may be wound and bonded to the outer surface of the shrinkable rubber tube 1 while being heated and melted using a heat source such as a burner.

FIG. 3 shows another example of the tape-like material 2', in which the tape-like material 2' is a tape-like support material 2 having mechanical strength capable of resisting the shrinkage force of the shrinkable rubber tube 1.
1 and an adhesive layer 22 having wall opening adhesive strength capable of resisting the contraction force of the rubber tube 1. The material of the support body 21 is not particularly limited, and may be made of metal, synthetic resin, etc. as long as it satisfies the above conditions. The adhesive layer 22 may also be made of any activated adhesive or pressure-sensitive adhesive that can be peeled off from the surface of the rubber tube 1 at room temperature, but pressure-sensitive adhesives can be used without using auxiliary means such as heating. This is preferable because shrinkage of the rubber tube 1 can be prevented by winding and adhering the tape-like material 2'.

Although not shown in the drawings, as described above, without forming the adhesive layer 22 on the surface of the tape-shaped support 21 in advance, for example, the adhesive is applied to the outer surface of the shrinkable rubber tube by brushing, spraying, etc. Of course, a tape-like support may be wound and adhered onto this.

The reference numeral 3 in FIG. 2 indicates an inner layer material provided in advance on the inner surface of the rubber tube before expansion or on the inner surface of the rubber tube 1 after expansion. Anything having an adhesive or sealing effect, such as an adhesive or a sealing material, is used. The inner layer material 3 may be formed on the entire inner surface, the end inner surface of the rubber tube 1, or the central inner surface depending on the purpose.

When a contractible rubber tube is wound and bonded with a tape-like material in this way, the mechanical strength of the tape-like material, the adhesive strength between the tape-like material and the rubber tube, and the spiral winding state of the tape-like material are determined. Due to the synergistic effect of
This prevents the shrinkable rubber tube from shrinking and maintains its expanded state.

When contracting the rubber tube held in the expanded state in this way, for example, the rubber tube is attached to a conductor connection part of a high-voltage cable, etc., and the tape-like material is gradually peeled off from one end. ,
The rubber tube becomes free, contracts by the contraction force, and is tightly fixed to the connection part.

As described above, the holding method of the present invention includes wrapping and adhering a tape-like material in a spiral shape on the surface of a contractible rubber tube in which a rubber tube is expanded in a state where it can be peeled off at room temperature.
Since the contraction is prevented and the enlarged state is maintained, it has the following various characteristics.

(1) Manufacturing is simple because a tape-like material is wound and bonded from the outside of a cold-shrinkable rubber tube held in an expanded state.

(2) Since a tape-like material capable of resisting the contraction force of the rubber tube is wound and glued to the outer surface, (a) the outer diameter of the tape should be slightly larger than the outer diameter of the object to which it is applied, such as the conductor connection part of a high-voltage cable. Since the rubber tube can be attached by being enlarged and held, the rubber tube is less likely to be stretched unnecessarily, compared to the case where it is enlarged and held on the inner surface of the rubber tube.

(b) An inner layer material can be formed on the inner surface, and an adhesion or sealing effect with the application body can be expected.

(c) The tape-like material can be peeled off smoothly during installation, and no special skill is required.

[Brief explanation of the drawing]

FIG. 1A is a partial side view showing an example of the holding method of the present invention, FIG. 1B is a partially enlarged sectional view of FIG. 1A taken along the line -', and FIGS. 2 and 3. is a partially enlarged sectional view showing another example. DESCRIPTION OF SYMBOLS 1... Expanded cold-shrinkable rubber tube, 2, 2'... Tape-like material, 21... Tape-like support, 22... Adhesive layer, 3... Inner layer material.

Claims (1)

[Claims] 1. A cold-shrinkable rubber tube, which is made by mechanically expanding a rubber tube, and a tape-like material capable of resisting the shrinkage force of the rubber tube is spirally wound and adhered to the surface of the cold-shrinkable rubber tube. How to hold it.