JPH0698170B2 - Heat shrinkable bag - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat-shrinkable bag body attached to a metal tube such as a copper tube so as to close the tube end opening of the metal tube.

[Conventional technology]

In order to prevent dust, water and the like from entering the inside of the metal pipe through the opening of the pipe end, a lid is usually attached here to close the opening of the pipe end.

As the lid body, there is conventionally a substantially concave poly stopper 11 as shown in FIG. 4, which has a flange portion 11b formed at the upper end of the main body insertion portion 11a. Tube 1
For example, it is pushed into the pipe end opening 1a such as a copper pipe, and the flange portion 11b is brought into contact with the pipe end surface 1b to close the opening 1a.

However, such a poly stopper 11 is a poly stopper due to frictional resistance.
Since 11 is only locked to the opening 1a of the metal tube 1, if the size of the poly plug 11 and the size of the opening 1a do not match, the poly plug 11 will easily come off easily in the normal state, or difficult to fit. In addition, when the poly stopper 11 is intentionally removed by hand, the end of the flange portion 11b is pinched and pulled, but the body insertion portion 11a can be pulled in the opening portion 1a just by pinching one portion and pulling. There is an inconvenience that it is difficult to remove because it becomes diagonal. In addition, it cannot be said that the poly stopper 11 looks beautiful.

Therefore, for example, as disclosed in JP-A-58-200754, there is a method of applying a heat-shrinkable bag-like film 12 to the opening 1a of the metal tube 1 as shown in FIG. According to this, the above-mentioned inconvenience that the conventional example is easily detached naturally is eliminated.

[Problems to be Solved by the Invention]

However, in the method described in Japanese Patent Laid-Open No. 58-200754, since the bag is covered with the tubular body, the tubular one is fitted to the tubular one, and the diameter of the film is made of metal. Since it cannot be formed to be extremely larger than the diameter of the pipe, it is often difficult to cover the metal pipe with the film.
Also, once the film is attached to the metal tube, it will be adhered due to heat shrinkage, so if you try to remove it by hand, there is no grip and it will not fit in the handle, It is difficult and difficult to remove.

The object of the present invention is to eliminate the disadvantages of the conventional example, and when the tube end of a metal tube is covered with a bag-shaped film, the film is not easily separated from the tube end in a normal state. In particular, it is to provide a heat-shrinkable bag body that is easy to put on the pipe end and easy to remove when it is removed by hand, and is easy to use.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a heat-shrinkable bag body which is attached to close a pipe end opening of a metal pipe,
The gist is that cutting cuts are provided at intervals in the circumferential direction of the opening end of the bag body.

[Action]

According to the present invention, when the bag body is attached to the metal tube, the opening end of the bag body expands to some extent through the cut cuts provided at intervals in the circumferential direction of the opening end of the bag body. Easy to insert in a metal tube. Further, when the bag body is removed from the metal tube, by grasping and pulling the bag body portion between the notches formed by the cutting notches, the bag body is torn from the notch portion and can be easily peeled off.

〔Example〕

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

FIG. 1 is a front view showing an embodiment of a heat-shrinkable bag body of the present invention. This heat-shrinkable bag body 2 is made of a polyethylene film having a thickness of 0.07 mm as an example, and has a crease line in the length direction.
3, 3 are provided to form a flat shape as a whole, and the tip portion 4 is closed by the heat-welded portion 4a. The open end 5 at the other end is provided with V-shaped notches 6 and 6 by cutting the corners at the fold lines 3 and 3. 2a shows a tongue-shaped bag portion between the notches 6 and 6.

The cuts 6,6 are provided at least at two places, and the boundary between the cuts 6,6 and the peripheral edge of the opening end 5 is formed in a sharp corner 6a.

Next, the manufacturing process of such a heat-shrinkable bag will be described with reference to FIG.

First, a flat cylindrical body 7 made of a polyethylene film as shown in FIG. 2 (a), which is long and has fold lines 3, 3 formed on both edges along the longitudinal direction, is prepared, and the flat cylindrical body 7 is appropriately spaced,
For example, cut at 7 cm intervals (Fig. 2 (b)).

One end of the tubular cut piece 8 thus obtained is heat-welded and closed (FIG. 2 (c)). This closed portion is the above-mentioned heat welded portion.
It is 4a.

Then, the opening end 5 at the other end of the cutting piece 8 is connected to the fold lines 3, 3
Then, the heat-shrinkable bag body 2 is formed by cutting at the above positions to form V-shaped notches 6 and 6. (FIG. 2 (d)).

The shape of the cuts 6, 6 is not limited to the V-shape, but may be simply cut into a linear shape.

Next, the usage will be described.

The open end 5 of the heat-shrinkable bag body 2 is expanded and the tube end opening 1a of the metal tube 1 is inserted therein. At this time, since the opening end 5 is somewhat widened by the cuts 6, 6, the metal tube 1 can be inserted smoothly.

Then, when the tube end surface of the metal tube 1 is inserted into the tip portion 4 of the bag body 2, hot air or hot water is applied to the bag body 2 in this state to cause heat shrinkage of the bag and the surface of the metal tube 1. In close contact with.

Thus, as shown in FIG. 3, the pipe end opening 1a of the metal pipe 1
Is covered with the heat-shrinkable bag body 2 to close the opening 1a, which prevents dust and water from entering the tube. Since the heat-shrinkable bag body 2 contracts and comes into close contact with the surface of the metal tube 1, the bag body 2 does not come off from the metal tube 1 by itself.

Next, in order to remove the bag body 2 adhered to the surface of the metal tube 1 from the metal tube 1, the tongue-shaped bag body portion 2a between the notches 6 and 6 is peeled off with a nail, and this portion is first removed. Start from 1. Next, if this portion is pulled as a handle portion, the bag body 2 is torn from the cut portions 6,6. In this case, since the notches 6 and 6 are provided at a plurality of intervals, the bag body 2 is divided into a plurality of pieces when the bag body portion 2a is pulled, so that the bag body 2 can be easily peeled off.
At this time, since the bag body 2 is formed with a thickness of 0.07 mm, it is thin and easy to peel off.

In the embodiment, the fold line 3 is naturally formed by first using the flat cylindrical body 7 in the process of manufacturing the bag body 2. However, when the bag body 2 is peeled off, the fold line 3 is formed. As a result, the bag body 2 is easily torn from this portion. Therefore, if the fold line 3 is not naturally provided in the manufacturing process or the storage process, it is more convenient to attach the fold line 3 separately.

In addition, if the bag body 2 is colored blue or green, it looks beautiful.

〔The invention's effect〕

As described above, the heat-shrinkable bag body of the present invention is easy to put on a metal tube and easy to remove even if it is removed by hand, and thus is very convenient.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the heat-shrinkable bag body of the present invention,
2 is an explanatory view showing the manufacturing process of the same as above, FIG. 3 is a vertical sectional front view showing a state of being adhered to a metal tube, FIG. 4 is a vertical sectional front view showing a conventional example, and FIG. FIG. 1 ... Metal tube, 1a ... Pipe end opening 1b ... Pipe end face, 2 ... Heat-shrinkable bag 2a ... Tongue-shaped bag part 3 ... Fold line, 4 ... Tip 4a ...... Heat welded part, 5 …… Open end 6 …… Notch, 6a …… Corner part 7 …… Flat cylindrical body, 8 …… Cut piece 11 …… Poly plug, 11a …… Main body insertion part 11b …… Flange part, 12 ... Bag-shaped film

Claims (1)

[Claims] 1. A heat-shrinkable bag which is attached so as to close the tube end opening of a metal tube, wherein cut cuts are provided at intervals in the circumferential direction of the open end of the bag. A heat-shrinkable bag.