JPH07164531A - Plastic joining tape - Google Patents

Abstract

PURPOSE:To attach to any joint surface using one kind by forming, on a plastic base tape, a continuous conductive passage to be extended in the longitudinal direction of a tape being snaked in the width direction of the tape. CONSTITUTION:A base tape 1 made of a thermoplastic plastic which is same as that of a material to be fused has flexibility and stretching property i.e., elasticity, a free length and a predetermined width. A conductive wire 2 which generates resistance heat at the time of energization such as nickel wire or copper wire to be embedded in the base tape 1 has a diameter a little smaller than the thickness of the base tape 1. The conductive wire 2 is embedded in the base tape 1 in a state extended in the longitudinal direction of the tape being snaked in the width direction of the tape. A continuous conductive passage to be extended in the longitudinal direction of the tape being snaked in the width direction is formed on the plastic base tape 1 by the conductive wire 2, so that heat can be generated from almost the whole surface of the base tape 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic joining tape used for joining a plastic product or component to the plastic product or component by electric fusion.

[0002]

2. Description of the Related Art There are various kinds of plastic products joined by electric fusion, and representative examples thereof include a plastic pipe and a plastic joint. At this time, an electric fusion heating element is used. A conductive wire coated with a resin is wound in a spiral shape along a cylindrical surface to be molded into a sleeve, which is embedded in advance in the inner peripheral surface of the joint.

[0003]

Since the heating element for electric fusion which takes the conventional form of the joint surface from the beginning has no versatility and is a dedicated one, it is necessary to prepare it for each product. Not only does this impose a heavy burden on the manufacturing side, but there is also a problem in that it cannot be applied to a joint surface having a complicated shape.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a plastic base tape is formed with a continuous conductive path that is meandered in the tape width direction and extends in the tape length direction.
It is a single type and can be attached to any joint surface.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of a plastic joining tape according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view. In the figure, (1) is a base tape made of the same thermoplastic material as the material to be fused, which is flexible. In addition, the base tape (1) having elasticity and elasticity has a free length and is formed to have a predetermined tape width.

In the figure, (2) is a conductive wire such as a nickel wire or a copper wire embedded in the base tape (1) that generates resistance heat when energized, and has a diameter slightly smaller than the thickness of the base tape (1). Then, the conductive wire (2) is the base tape (1).
Embedded in the base tape (1) in a state where the tape is meandered in the tape width direction and extended in the tape length direction, and is embedded in the plastic base tape (1) by the conductive wire (2).
A continuous conductive path is formed so as to meander in the width direction and extend in the tape length direction so that heat can be generated from substantially the entire surface of the base tape (1).

There are various methods for embedding the conductive wire (2) in the base tape (1). One example is as follows.
A method of sandwiching the conductive wire (2) from above and below with a tape on one side of the base tape (1) and fusing the upper and lower tapes or a method of forming the base tape (1) on the conductive wire (2) ) There is a method of making a film in the shape.

The conductive paths may be formed on one side or both sides of the base tape (1). In this case, nickel foil or copper foil may be formed on one side or both sides of the base tape (1) as in the printed wiring board. Is printed to form the conductive path.

Since the conductive paths meander in the tape width direction and continuously extend in the tape length direction, elasticity of the base tape (1), particularly elasticity, is not lost, and the base tape ( The expansion and contraction of 1) prevents the conductive path from being cut off on the way.

The plastic joining tape described above is stored and carried in a rolled state.

An example of using the above-mentioned plastic joining tape will be described below with reference to FIGS. 3 to 6.

FIGS. 3 and 4 show an example of using a joining tape for plastic when joining the thermoplastic pipe (3) and the thermoplastic joint (4) by electric fusion. In this case, first, As shown in FIG. 3, the base tape (1) cut to the required length is tightly wound around the outer peripheral surface of the pipe (3) in a spiral shape without gaps so that the conductive wire (2) does not overlap. The conductive wire (2) is exposed from the winding start end and the winding end end of the base tape (1). After that, the inlet of the pipe (3) is inserted into the receiving end of the joint (4), and the winding start end of the base tape (1) is moved outward from the receiving end of the joint (4) into which the pipe (3) is inserted. At the same time as withdrawing, the winding end of the base tape (1) is pulled outward from the other receiving port of the joint (4) in which the tube (3) is not inserted. Then, by connecting the conductive wires (2) exposed at both ends of the base tape (1) to the power supply (5), the outer peripheral surface of the base tape (1) and the insertion opening of the pipe (3) sandwiching the base tape (1). Also, the resin on the inner peripheral surface of the receiving port of the joint is melted and joined. Further, after joining, the ends of the conductive wire (2) protruding from both ends of the joint (4) are cut off. It is possible to apply a solvent having an affinity to the inner surface of the base tape (1) to be wound around the pipe (3) and fix the wound base tape (1) to improve workability and to smoothly fuse the melted tape in the melting process.

When the pipe (3) is joined to the other receiving port of the joint (4), the winding end of the base tape (1) cannot be pulled out to the outside. In this case, as shown in FIG. , With the two base tapes (1) cut into required lengths in parallel, form a spiral shape without gaps so that the conductive wire (2) does not overlap the outer peripheral surface of the mouth of the pipe (3). The base tape (1) is tightly wound and the conductive wire (2) is exposed from the winding start end and the winding end end of each base tape (1).
The conductive wires (2) exposed from the winding end of the base tape (2) are connected to the conductive wires (2) exposed from the receiving end of the joint tape (4) to insert the pipe (3). (2) That is, since both ends of the continuous conductive wire (2) can be drawn out, the conductive wire (2) can be energized.

Further, even if the base tape (1) is wound around the outer peripheral surface of the mouth of the pipe (3) as shown in FIG. 3, the tape (1) is located in front of the mouth of the pipe (3) or in the center of the joint (4). It is effective to open the one-letter cut end for pulling out the winding end of the base tape (1) to the outside so that the peripheral wall of the cut end can be melted and closed.

FIG. 6 is a plastic joining tape for joining a thermoplastic flexible tube (6) having screw-shaped irregularities on its outer peripheral surface and a thermoplastic joint (7) by electric fusion. Shows an example of using
As is apparent from FIG. 6, even if the joining surface has a complicated shape, the base tape (1) is provided on the outer peripheral surface of the flexible tube (6) so that the conductive wire (2) does not overlap along the screw. By tightly winding it in a spiral shape, the base tape (1) follows the screw-shaped irregularities on the outer peripheral surface of the flexible tube (6), and the conductive wire (2) is attached to the outer peripheral surface of the insertion opening of the flexible tube (6). Is properly stretched, so that the pipe (6) having a complicated joint surface and its joint (7) can be properly joined by electric fusion.

The use example of the joining tape for plastics is not limited to the above-mentioned joining of the plastic pipe and the plastic joint, and can be used for joining any plastic products.

[0017]

As described above, by joining the plastic products by the electric fusion using the joining tape for plastics of the present invention, one kind of it can be applied to the joining surface of any form. In addition to the fact that it can be used extensively to solve problems in manufacturing, it also has the effect that it is possible to easily join plastic products by electric fusion, which was not possible in the past.

[Brief description of drawings]

FIG. 1 is a front view of a joining tape for plastics.

FIG. 2 is a sectional view of a joining tape for plastics.

FIG. 3 is an explanatory view of winding a joining tape for plastics.

FIG. 4 is an explanatory view of mounting a joining tape for plastics.

FIG. 5 is an explanatory view of another winding of the joining tape for plastics.

FIG. 6 is an explanatory view of another attachment of the plastic joining tape.

[Explanation of symbols]

 (1) Base tape (2) Conductive wire (conductive path)

Claims (1)

[Claims] 1. A joining tape for plastics, comprising a plastic base tape and continuous conductive paths that meander in the tape width direction and extend in the tape length direction.