JPH038417Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a heat-shrinkable sheet used for corrosion prevention and protection of connection parts of various pipe bodies, electric wires, cables, etc.

<Prior art> It is necessary to prevent or protect the connections of various conduits, electric wires, cables, etc., and for this purpose, heat shrink tubes are used to cover the connections, but it is not possible to use heat shrink tubes. In such cases, pipes, wires, cables, etc. must be inserted in advance before being connected.

By the way, when it comes to conduits, electric wires, and cables, it may be necessary to overturn the tube or repair damaged parts due to accidents that occur after connection, and heat-shrinkable tubes like the one described above are used for such parts. Since this is not possible, a wrap-type heat-shrinkable sheet is required.

As a conventional wrapping method heat-shrinkable sheet, the fifth
As shown in FIG. 6 and FIG.
After winding it around an adherend such as a pipe, channel material 3 is fitted to the protrusions 2 on both sides to fix the wound state, and as shown in Fig. 7, there is a short-shaped thermal A shrinkable sheet 1 is wrapped around an adherend, and both sides of the sheet 1 are fixed with heat-adhesive patch material 4.

<Problems to be solved by the invention> By the way, the former type of heat-shrinkable sheet has a complicated shape, resulting in high manufacturing costs, and also has two protrusions.
It is said that the heating on both sides of the wire and cable is not sufficient, resulting in uneven shrinkage.Furthermore, when installed on wires and cables, due to channel 3, the wires and cables are less flexible and cannot tolerate bending. There's a problem.

In addition, in the case of the latter, the entire length of the side edge of the heat-shrinkable sheet 1 must be fixed in advance with patch material, so it is difficult to attach the patch material, especially when the tube, electric wire, or cable has a small diameter, and the work is difficult. The problem is that it is difficult.

This idea was made to solve the above problems, and it can be wrapped around conduits, electric wires, cables, etc. after connection with a simple operation.
Moreover, the object is to provide a heat-shrinkable sheet that has no protrusions and has a smooth appearance.

<Means for Solving the Problems> In order to solve the above-mentioned problems, this invention has a V-shaped recess that is recessed inward at one end of the heat-shrinkable sheet in the shrinking direction. A notch is formed, and triangular protrusions are formed on both sides of the notch, and these serve as fixed parts when wrapped with the sharp ends of both protrusions facing outward.

<Function> Wrap a heat-shrinkable sheet around the connecting part of the adherend such as piping, electric wires, cables, etc. so that the protrusions provided on both sides of one end are on the outside, and then tie the sharp ends of the protrusions as appropriate. The material is fixed by a means, and then heated with a gas burner or the like to shrink, and the adherend is closely coated.

<Example> Hereinafter, an example of this invention will be described based on FIGS. 1 to 4 of the accompanying drawings.

1 and 2 show a first example of this invention, in which a V-shaped notch recessed inward is formed at one end of the rectangular heat-shrinkable sheet 11 located in the shrinking direction. 12, and triangular protrusions 13, 13 are formed on both sides of the notch 12.

The method of using the above-mentioned heat-shrinkable sheet is to first wrap the heat-shrinkable sheet 11 around an adherend a such as a tube, electric wire, or cable from the ends D and E sides of the sheet, and then The sharp ends B and C of 13 and 13 are fixed to the already wrapped part with staples 14.

Any fixing means may be used as long as it does not shift due to shrinkage during heating, and for example, a button method, a band, an adhesive tape, etc. can be used.

Next, by heating and shrinking the wound heat-shrinkable sheet 11 from the outer periphery using a propane gas burner or the like, the outer periphery of the adherend a can be tightly coated.

In the second example shown in FIGS. 3 and 4, hot melt adhesive 15 is applied in advance to the ends D and E of the heat-shrinkable sheet 11 shown in the first example, and the adherend is The adhesive 15 exhibits a waterproof function when it is tightly coated on the adhesive 15a.

In addition, in any example, the heat-shrinkable sheet 11
The protrusions 1 on both sides are removed during heat shrinkage after winding.
Since the sharp edges B and C of Nos. 3 and 13 are fixed, the sheet does not shift at the outer edge.

Example 1 Using a cross-linked polyethylene sheet with a thickness of 0.3 mm that has been stretched twice, A-B and A-C are shown in FIG.
235mm, B-C, D-E 400mm, B-D, E-
Cut C into 400mm, and on the side that will become the inner surface when wrapped, from sheet edge D-E, width 400mm, length 140mm, thickness 0.7mm
Hot melt adhesive was applied.

The outer jacket of a single-core electric cable with an outer diameter of 24 mm is 200 mm in length.
The conductor was peeled off over a length of mm, exposing a portion of the conductor.

The heat-shrinkable sheet was wrapped around the exposed portion of the conductor, the sharp ends of both protrusions were fastened with staples, and then the surrounding surface was heated with a propane gas burner to shrink it.

After the heat shrinkage described above, this sample was subjected to a water immersion test. The samples were immersed in room temperature water and the ingress of water between the heat shrinkable sheet and the cable was investigated by measuring the resistance between the conductor ends and the water over a period of 30 days.

The initial resistance was 8×10 ¹² Ω or less, while the final resistance was 9×10 ¹² Ω, and did not decrease below 8×10 Ω ¹² during this period.

As a result, when used in conjunction with hot melt adhesive,
It is effective as a protective material that prevents moisture from entering.

<Effects> As described above, according to this invention, a V-shaped notch that recesses inward is provided at one end of the heat-shrinkable sheet in the shrinking direction, and sharp protrusions are provided on both sides of this notch. Since the sharp ends of both protruding parts are fixed on the outside during winding, all you have to do is wrap it around the adherend and stop the sharp ends, making it extremely easy to apply the coating to the adherend. This makes it easy to heat the entire circumferential surface evenly.

In addition, since the sharp ends of the protrusions on both sides are stopped and contracted, there is no misalignment at both ends during contraction, and the heat-shrinkable sheet only needs to be cut to fit the dimensions of the adherend. It is simple and low cost, and after construction, there are no protrusions on the outer periphery, giving it a clean appearance and flexibility at any angle.

Furthermore, since it is only necessary to wrap it around the adherend,
It is extremely effective as an anti-corrosion, protection, or reinforcing material for connections of piping, electric wires, cables, etc. where heat shrink tubes cannot be inserted.

[Brief explanation of the drawing]

Figure 1 shows the first heat-shrinkable sheet according to this invention.
FIG. 2 is a perspective view showing the above example in use, FIG. 3 is a perspective view showing the second example, FIG. 4 is a perspective view showing the above in use condition, and FIG. 5 6 is a perspective view showing a conventional heat-shrinkable sheet, FIG. 6 is a front view showing the state of use of the same, and FIG. 7 is a perspective view showing another example of the conventional sheet. 11...Heat-shrinkable sheet, 12...Notch, 1
3... Protrusion, 14... Needle, 15... Adhesive.

Claims (1)

[Scope of utility model registration request] A V-shaped notch that recesses inward is formed on one end of the heat-shrinkable sheet located in the shrinking direction, triangular protrusions are formed on both sides of this notch, and both protrusions are sharpened. A heat-shrinkable sheet that is used as a fixed part when wrapped with the outer side facing out.