JPS6230025A - Illustration of identifying mark on surface of heat-shrinkable plastic tube - Google Patents

Abstract

PURPOSE:To make actually the life time of an identifying mark same as the life time of heat-shrinkable tube itself, by shrinking the heat-shrinkable plastic tube by heat, by cooling it to room temp. and by illustrating a specified identifying mark on the surface of the tube by pressing a marking device having a specified content of illustration on it. CONSTITUTION:A heat-shrinkable polyethylene tube 2, whose gel content is higher than 35% having been inserted on either of the circumference of the insulation cable 1 before connecting the specified rubber plastic insulation cables 1, is moved to the circumference of the connected part after connecting the cables and is thereafter heat-shrinked by means of a specified heating device to tightly adhere the tube on the circumference of the connected part 3 of the cables and is cooled to room temp. An identifying mark is thereafter illustrated by pressing a marking device 4 having a specified content of illustration on the surface of the heat shrinkable polyethylene tube 2 for one sec or more.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to the application of identification marks to the surface of a heat-shrinkable plastic tube coated on an object to be coated, such as a connecting portion or terminal portion of an electric wire or cable. It concerns a method of displaying.

[Prior Art] Conventional methods for displaying identification marks on the surface of this type of heat-shrinkable plastic tube include ink printing,
Methods such as attaching a label, applying paint, baking ink, and wrapping a nameplate are required.

[Problems to be Solved by the Invention] However, each of the above display methods has the following drawbacks.

■ As printing ink using ink printing has good weather resistance and does not stain easily,
If left over a long period of time, there is a risk of fading.

■ Label attachment method It is difficult to obtain weather-resistant adhesives for attaching labels, so there is a risk that the labels may peel off over a long period of time.

■ One of the key points when applying paint is that it is difficult to get 1q of paint with good weather resistance, so there is a risk of fading over a long period of time.

■ The mechanical properties of the material (tube) are damaged due to ink burning, and as a result, cracks are likely to occur in the material, and there is a risk that the original properties of the tube may not be maintained.

■ In order to securely fix the nameplate to the material by wrapping it around the nameplate, use a fairly thick nameplate (metal plate), or take other measures to further fix it after wrapping the nameplate. It is necessary, but this will increase the overall cost.

[Means for solving the problems] The present invention has been made in consideration of these points, and has the following features:
The purpose is to solve the above-mentioned difficulties of the prior art and to provide a method for inexpensively and reliably displaying an identification mark on the surface of a heat-shrinkable plastic tube.

That is, the gist is to heat-shrink a heat-shrinkable plastic tube and, after cooling it to room temperature, apply a predetermined identification mark by pressing a stamping machine with predetermined display contents onto the surface of the tube.

In order to ensure the clarity of the above identification mark over a long period of time, it is preferable to use a heat-shrinkable plastic tube with a gel fraction of 35% or more, and to set the stamping machine's pressing (stamping) time to 1 second or more. It's good to keep that in mind. or,
Although not limited thereto, heat-shrinkable plastic tubes with a wall thickness of 2# or more are particularly effective.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

First, as shown in Fig. 1, before connecting a specified rubber/plastic insulated cable 1, a heat-shrinkable polyethylene tube 2 with a gel content of 35% or more is inserted around one cable. After connecting the cable,
Avoid moving the tube 2 over the three circumferences of the cable connection part, and then heat the tube 2 with a predetermined heating device (not particularly shown) to shrink it, and bring it into close contact with the three circumferences of the cable connection part, and further Cool this to room temperature. Thereafter, an identification mark is applied to the surface of the heat-shrinkable polyethylene tube 2 by pressing the marking machine 4 with predetermined display contents for one second or more on the surface of the heat-shrinkable polyethylene tube 2. FIG. 2 shows a heat-shrinkable polyethylene tube 2 with a stamped identification mark.

In this example, the heat-shrinkable polyethylene tube 20
0.1.2.3,4 on the surface.・・・・・.

I explained about the case where Arabic numerals are engraved.
In place of the Arabic numerals mentioned above, it is also possible to stamp a manufacturer's mark, a manufacturing manager's number, etc.

[Effects of the Invention] According to this embodiment, which is carried out as described above, instead of the various conventional display methods described above, a stamping machine with predetermined display contents is pressed onto the surface of a heat-shrinkable polyethylene tube. By applying the identification mark, the lifespan of the identification mark can be made substantially equal to the lifespan of the tube itself, thereby eliminating the drawbacks of the conventional methods (1) to (3). In addition, the disadvantages of method (2) can be overcome, and the method has the advantage of being less expensive than method (2).

As described above, the present invention solves all the difficulties in the various conventional methods described above, and its practical value can be said to be extremely great.

[Brief explanation of the drawing]

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 is an explanatory diagram of one embodiment of a heat-shrinkable polyethylene tube provided with an identification mark according to the present invention. 1: Rubber/plastic insulated cable, 2: Heat-shrinkable polyethylene tube, 3: Cable connection, 4: Stamping machine.

Claims (3)

[Claims] (1) Insert a heat-shrinkable plastic tube to be coated around the circumference of a predetermined object to be coated, further heat-shrink it, and after cooling it to room temperature, stamp a stamp with predetermined markings on the surface of the tube. A method for displaying an identification mark on the surface of a heat-shrinkable plastic tube, characterized by imprinting a predetermined identification mark by pressing. (2) The method for displaying an identification mark on the surface of a heat-shrinkable plastic tube according to claim 1, wherein the object to be coated is a connection portion or an end portion of an electric wire or cable. (3) Heat-shrinkable plastic tube has a gel fraction of 35%
A method for displaying an identification mark on the surface of a heat-shrinkable plastic tube according to claim 1, which is the heat-shrinkable crosslinked polyethylene tube as described above.