JPS58179634A - Shrinkable sleeve - Google Patents

Abstract

PURPOSE:To obtain the titled sleeve which can be provided with an adhesive layer inside and has an excellent waterproofness and electrical insulating properties, by stretching the sleeve of a rubber elasticity radially at an ordinary temperature and fixing its outside via an adhesive into a metal case which is provided with a notch lengthwise. CONSTITUTION:E.g., by stretching the sleeve having a rubber elasticity (preferably, the cylindrical object of a uniform wall thickness composed of the elastomer of an ethylene-propylene rubber, etc. presenting an elongation above 200%) 12 at an ordinary temperature radially and fixing its outside via an adhesive (preferably, an epoxy adhesive, etc. which has a bond strength of two or more times of the shrink force of the rubber) 11 into the metal case (preferably, the thin wall metal cylinder of aluminum, iron, etc.) 10 provided with a notch (preferably, its depth is one fourth of the wall thickness,) 10a lengthwise, removing the metal case 10 in an arrow direction in a using time and making said sleeve 12 to shrink, the purpose sleeve is obtained. USE:For moistureproofness, waterproofness and electrical insulation of the joint and the terminal of an electric wire and cable, etc.

Description

[Detailed description of the invention] be.

Heat-shrinkable sleeves come in a variety of materials and packaging, but they do not shrink unless heat is applied.

Non-heatable sleeves are preferred in hazardous materials manufacturing or handling facilities where open flames cannot be used, or where open flames are too dull to use.

At present, as a non-heating shrink sleeve, a rubber sleeve 1 or a tube is attached to a spring 2 as shown in Figure 1.
The inner spring 2 can be removed by mechanically pushing it apart during use, or the rubber filter can be swollen with solvent 4 to enlarge its diameter and sealed, as shown in Figure 2, and the solvent can be volatilized during use. There are commercially available products that allow the shrinkage to occur.

However, the one shown in Figure 1 has (1) a spring, so it is not possible to apply adhesive or adhesive to the inner layer of the sleeve.

(2) Due to the presence of a spring, it is not possible to contract it to the narrowest diameter.

Also, the one in Figure 2 is (1) The toxicity of the solvent becomes a problem.

(2) High shrinkage rate and shrinkage force cannot be obtained.

(3) It is difficult to apply an inner layer agent.

(4) Long-term storage is not possible.

It has the following drawbacks.

The present invention provides a shrinkable sleeve that eliminates the above-mentioned drawbacks, and its characteristics are that a rubber sleeve or tube that is rubber elastic at room temperature is stretched in the radial direction and is mechanically held from the outside, thereby retaining the shape of the outside. The purpose is to radially shrink the sleeve or tube by removing the material.

The perspective view of FIG. 3 (A) of the shrinkable sleeve of the present invention.

This will be explained based on the sectional view of FIG. 31(b).

A metal case 10 with a notch 10a mechanically holds the rubber sleeve 12 from the outside via an adhesive 11, and an adhesive inner layer material 16 is provided on the inside of the rubber sleeve. In use, as shown in FIG. 3(a), the metal case portion between the adjacent notches 10a of the metal case 10 can be removed in the direction of the arrow +j.

To explain the constituent materials in more detail, il+ rubber sleeves or tubes include butyl rubber, chloroprene rubber, styrene-butadiene rubber, nitrile rubber, and ethylene propylene rubber.

At least an elastic material such as acrylic rubber or fluororubber,
A cylindrical body with a uniform wall thickness that exhibits an elongation rate of 200% or more. (2) The inner adhesive layer is natural rubber or butyl rubber.

Styrene-butadiene rubber, styrene-isoprene rubber, etc. mixed with softeners, tackifiers, fillers, etc. that are sticky at room temperature. (3) For the outer notched metal case, aluminum, iron, stainless steel, copper. It is a thin metal cylinder such as 1
(4) Adhesives include epoxy adhesive, polyurethane adhesive, chloroprene rubber adhesive, and nitrile rubber. An adhesive or the like with adhesive strength that is at least twice as strong as the shrinkage strength of rubber is used.

The relationship between rubber shrinkage stress, adhesive strength, and case strength should satisfy the following formula (see Figure 4).
Two cases - 31.1. Length? [
Example] Fillers such as carbon and clay, a softener, a crosslinking agent, and an anti-aging agent are added to ethylene propylene rubber and kneaded. ; Molded into a 00mm sleeve. After molding, the sleeve was inserted into a mandrel having an outer diameter of soonmφ to enlarge the inner diameter of the rubber sleeve. Apply thermosetting epoxy adhesive to the outer surface of the sleeve to a thickness of 0.2 mm, and apply a thickness of 0.3 m to the outer periphery with a thickness of Q mm and a gap of 0.3 m to the outer circumference.
An aluminum pipe with a notch of m in diameter was inserted and adhered to the outer surface of the rubber sleeve.

After heating and curing at 700°C, the mandrel was pulled together and the inner diameter j;
A shrinkable rubber sleeve expanded to QnLmφ was obtained. Thereafter, an adhesive made by kneading butyl rubber, a tackifier, and a softener was applied to the inner surface of the sleeve to make the sleeve waterproof.

The resulting sleeve has a rubber hardness of llt and a tensile strength of 10k.
g/crl.

700% modulus 23 to 9/ctl, elongation rate +, t
At θ%, the adhesive surface strength between ethylene propylene rubber and aluminum using epoxy adhesive is 3Jk in terms of tensile adhesive strength.
g/crl.

/ Peel strength of 3 mm width aluminum /,, 2 to 9/
/3 It was Tomo.

When this shrinkable sleeve was used at the connection part of a cabtire cable, insulation and waterproof properties were obtained for a long period of time.

The effects of the shrinkable sleeve of the present invention are as follows: (1) Since there is nothing fixed inside the sleeve and no solvent is used, an adhesive layer can be provided inside the shrinkable sleeve, so a waterproof insulation effect can be achieved.

(2) It is fixed to the outer case with adhesive strength that can withstand the stress of rubber shrinkage, so it will not shrink naturally.

(3) The outer metal case is notched to make it easier to tear, so by stripping the outer case, it can be easily shrunk anywhere without tools.

etc.

The shrinkable sleeve of the present invention can be used for electric wires and cables.

It is ideal for use as a moisture-proof, waterproof, and insulating sleeve for the connections and ends of steel pipes, steel pipes, etc.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a conventional non-heatable shrinkable sleeve, and FIG. 3 is an explanatory diagram of a shrinkable sleeve of the present invention, in which (a) is a perspective view, (b) is a cross-sectional view, Figure 4 is an explanatory diagram of the relationship between the shrinkage stress of the rubber and the buckling stress of the case. DESCRIPTION OF SYMBOLS 1... Sleeve, 2... Spring, 6... Rubber material, 4... Solvent, 10... Metal case, 10a.
Notch, 11, adhesive, 12... rubber sleeve, 16
...Adhesive inner layer material. Yoshi 3 Leap 1213 74 Leap 2

Claims (1)

[Claims] 1. A contraction characterized by stretching a sleeve having rubber elasticity in the radial direction at room temperature and fixing the outer side of the sleeve to a metal case having notches in the length direction via an adhesive. Sex sleeve. 2. The depth of the notch in the length direction of the metal case is equal to the wall thickness I.
2. The shrinkable sleeve according to claim 1, wherein the shrinkable sleeve is equal to or more than /q. 6. The shrinkable sleeve according to claim 1 or 2, characterized in that a waterproof insulating layer that is sticky at room temperature is provided inside the rubber elastic body.