JPS606710Y2 - heat shrinkable plastic tube - Google Patents

Description

[Detailed description of the invention] This invention relates to a plastic tube that shrinks when heated, especially a heat-shrinkable plastic tube that covers the entire connection part of a pipe, etc. By improving the structure of the plastic tube, It was devised for the purpose of simplifying the handling of the tube.

In recent years, connecting portions of pipes such as gas pipes or oil pipes have been coated with heat-shrinkable plastic tubes having a heat-shrinkable plastic layer on the outer circumferential surface and an adhesive layer on the inner circumferential surface as corrosion protection.

This heat-shrinkable plastic tube has a cylindrical release paper temporarily attached to it to protect the adhesive layer, and to use it, the release paper must be peeled off. If the tube is peeled off before being inserted into the adhered pipe, there will be problems such as the adhesive layer adhering to the adhered pipe during insertion, making it impossible to extrapolate the tube to a predetermined position.

For this reason, peeling is also performed after extrapolation, but conventional release paper has the same dimensions as the inner peripheral surface length of the tube, and the gap between the tube and pipe is small, so the peeling process is difficult. has become extremely difficult.

With the above points in mind, this invention aims to provide a heat-shrinkable plastic tube from which the release paper can be smoothly peeled off even after extrapolation.

Hereinafter, this invention will be explained based on the accompanying drawings showing examples thereof.

As shown in FIG. 1, the tube A of this invention consists of the inner periphery of a heat-shrinkable plastic tube body 1 made of polyethylene, polyvinyl chloride, polyester, silicone rubber, ethylene, propylene copolymer rubber, etc. An adhesive layer 2 such as a pressure-sensitive adhesive, a heat-activated adhesive, or a mastic adhesive is provided on the surface, and a release paper 3 in the shape of a longitudinal cylinder is temporarily provided on the inner peripheral surface of the adhesive layer 2. One end of the release paper is slightly protruded from the open end 4 of the heat-shrinkable plastic tube body 1, and a take-out portion 5 is formed around the entire circumference of the open end 4.

The take-out portion 5 may be formed not only at one end but also at both ends.

To cover the pipe connection part with this tube A, first, as shown in Fig. 1, extend the tube A close to the connection part of the pipe P to be coated, and use adhesive tape or adhesive as shown in the solid line in Fig. 2. After fixing the take-out part 5 to the adhered pipe P, when the tube A is further moved in the direction of the arrow a as shown by the chain line in the figure, the release paper 3 is peeled off while being bent.

During this operation, since the take-out part 5 is formed around the entire circumference of the opening 4, the release paper 3 does not bend smoothly as in the case where the take-out part is only partially provided as shown in Fig. 3. It never comes off.

When the release paper 3 is peeled off in this way, the adhesive layer 2 comes to face the outer peripheral surface of the adhered pipe P, and when the heat-shrinkable plastic tube body 1 is heated in this state, the tube will heat-shrink. The outer periphery of the adhered pipe P is completely covered with the adhesive layer 2.

As described above, the tube of this invention has a structure in which the end of the release paper protrudes from the open end of the plastic tube body and the release paper take-out part is provided around the entire circumference of the open end. The release paper can be easily peeled off even after the tube is inserted into the adhered pipe, which has the effect of making the work of adhering the tube smoother.

[Brief explanation of drawings]

Figure 1 is a sectional view of one embodiment of this invention, Figures 2 and 3.
The figure is a sectional view for explaining the adhesion work. 1...Plastic tube body, 2...
- Adhesive layer, 3...Release paper, 5...Take-out part, A...Heat-shrinkable plastic tube, P...Adhesive pipe.

Claims (1)

[Scope of utility model registration request] An adhesive layer is provided on the inner peripheral surface of a heat-shrinkable plastic tube body, and a longitudinal cylindrical release paper is temporarily attached to the inner peripheral surface of this adhesive layer, and the end of the release paper is A heat-shrinkable plastic tube, characterized in that a part for taking out a release paper is provided around the entire circumference of the opening end of the plastic tube body so as to protrude from the opening end of the plastic tube body.