JPH0710129Y2 - Long packing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a long packing material used for fixing and sealing long members such as electric wires and optical fiber cables.

[Conventional technology and its problems]

For example, in order to fix a long member such as an electric wire in a space having a constant length, a long packing material is provided along the fixed member.

Therefore, the inventors have focused on using a water-swellable composition as a packing material for such a long member. As the water-swellable composition, a swellable polyurethane resin, or a composition mainly composed of a water-swellable polymer substance such as swellable polyvinyl alcohol, a modified product of polyethylene oxide, a styrene-maleic anhydride copolymer, Polyvinylpyrrolidone cross-linked product, acrylic acid-acrylic amide copolymer cross-linked product, starch-acrylotolyl copolymer hydrolyzate, water-swellable substance by polymer substance such as cellulose derivative and rubber material (liquid rubber, natural rubber, synthetic (Rubber), and is configured as a water-swellable rubber.

Such a water-swellable rubber expands over time due to the water-swelling effect, and thus is effective as a holding material or a filler. Further, it has a high water-stopping action and can be used as a water-stopping material.

However, when a long packing material is made of the water-swellable rubber, it swells in the length direction, so that even if the length to be initially set is the same as that of the member to be pressed, the packing material may be changed over time. May increase in length and cause inconvenience.

An object of the present invention is to eliminate the disadvantages of the conventional example and to provide a long packing material in which a water-swellable rubber as a packing material swells only in the thickness direction and does not swell in the length direction.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides an outer circumference of a non-stretchable linear member made of metal, hard synthetic resin, hard rubber, or the like with an inner layer of general rubber and an outer layer of water-swellable rubber with the linear member as a core material. The inner layer and the outer layer are adhesively bonded to each other, and the vulcanized product is vulcanized while maintaining the adhesive state.

[Action]

According to the present invention, a non-swelling general rubber layer is provided immediately outside the filament member as the core material, and this general rubber layer and the water-swellable rubber layer on the outside thereof are bonded as a result of simultaneous extrusion molding. ing. Then, the water-swellable rubber layer increases its volume by the water-swelling effect, but in the length direction of the linear member, the inner general rubber layer restrains the thickness of the swollen rubber layer in the thickness direction. Only done.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the long packing material of the present invention, and FIG. 2 is a vertical sectional front view of the same as above. In FIG. 1, reference numeral 1 denotes a non-stretchable linear member as a core material.

As the linear member 1, a metal such as an aluminum alloy or a copper alloy, a rod, a metal fiber, a glass fiber or other hard synthetic resin, or hard rubber can be used. In addition,
The linear member 1 may be an electric wire or an optical fiber cable.

In the present invention, the entire outer periphery of the linear member 1 is covered with a coating material 2 which is a composite layer of a general rubber layer 2a as an inner layer and a water-swellable rubber layer 2b as an outer layer.

Examples of the rubber used in the general rubber layer 2a include natural rubber, chloroprene rubber, butyl rubber, ethylene-propylene copolymer rubber, urethane rubber, acrylonitrile-diene copolymer rubber, and polybutadiene rubber.

The composition forming the water-swellable rubber layer 2b is obtained by kneading the water-swellable composition (resin) as described above and the rubber in a conventional manner with a mixer such as a roll mixer, a Banbury mixer or a kneader. The powdery high water-swelling resin is mixed in a state of being dispersed in rubber.

In order to apply the coating material 2 comprising such a composite layer of the general rubber layer 2a and the water-swellable rubber layer 2b to the linear member 1, the linear member 1
Is simultaneously extruded as a core material.

Then, before the extrusion molding, each general rubber layer 2a and the water-swellable rubber layer
In the composition of 2b, a vulcanizing agent, a vulcanization accelerator, a vulcanization aid, a rubber vulcanization compounding agent such as an activator is mixed, and after extrusion molding,
When placed in a vulcanizer and subjected to heat treatment (about 140 ° C. for about 20 minutes), both the general rubber layer 2a and the water-swellable rubber layer 2b become tough vulcanized rubber.

Thus, the general rubber layer 2a and the water-swellable rubber layer 2b exhibit mutual adhesiveness by being coextruded and simultaneously vulcanized with the linear member 1 as a core material, and the general rubber layer 2a It adheres also to the outer periphery of 1 of the linear member as a core material. In addition,
When a metal rod is used for the linear member 1 as described above, a vulcanizing adhesive may be applied to the outer periphery of the metal rod in advance to assist the adhesion of the general rubber layer 2a. Further, unevenness may be formed on the outer periphery of the metal rod. You may make it improve adhesiveness.

On the other hand, in order to enhance the adhesive effect between the general rubber layer 2a and the water-swellable rubber layer 2b, it is desirable to use the same rubber material such as chloroprene rubber for the general rubber layer 2a.

Further, in the illustrated example, both the general rubber layer 2a and the water-swellable rubber layer 2b have a circular cross section, but as another embodiment, as shown in FIG. It can also be prismatic.

The linear member 1 thus coated with the coating material 2 is
The outer layer of water-swellable rubber layer 2b reacts with water and swells,
The overall diameter increases with the passage of time. Therefore, when inserting into the hole or the tube 3, even if there is a gap a on the outer periphery at the time of insertion, the gap a is closed by the swelling effect and the linear member 1 is firmly fixed. Since the water-swellable rubber layer 2b is joined to the general rubber layer 2a on the inner side, the water swelling is restrained by the general rubber layer 2a in the length direction of the linear member 1 and is not performed.

Therefore, when an electric wire or an optical fiber cable is considered as the linear member 1, the water-swellable rubber covering the linear member 1 swells in the longitudinal direction of the linear member 1 to connect the linear members to each other (for example, a cable). Then, there is no possibility of adversely affecting the connection part).

On the other hand, as another usage, for example, when the packing material of the present invention is arranged along a long member such as an electric wire in a space having a fixed length such as in a box, only the packing material is elongated and long. It doesn't hurt.

[Effect of device]

As described above, by using the water-swellable rubber layer, the long packing material of the present invention can be expanded in diameter after the fact, and is also highly waterproof.

Since the water-swellable rubber layer does not swell in the length direction, the length after swelling may be different even if the initial length is the same as the length of the wire or the like as the material to be packed. It is easy to use and has no

[Brief description of drawings]

FIG. 1 is a perspective view showing one embodiment of the long packing material of the present invention, FIG. 2 is a vertical sectional front view of the same, and FIG. 3 is a vertical sectional front view showing another embodiment. DESCRIPTION OF SYMBOLS 1 ... Linear member, 2 ... Coating material 2a ... General rubber layer, 2b ... Water-swellable rubber layer 3 ... Hole or tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-108157 (JP, A) JP-A-53-144985 (JP, A) Actually open 62-2325 (JP, U) Actual-open Sho-57- 121529 (JP, U) JP 60-37567 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A composite layer comprising an inner layer of general rubber and an outer layer of water-swellable rubber with the linear member as a core material, covering the outer periphery of a non-stretchable linear member such as metal, hard synthetic resin or hard rubber. But
A long packing material characterized in that the inner layer and the outer layer are vulcanized by being vulcanized while being adhesively bonded to each other and maintaining an adhesive state.