JPH0628265Y2 - Groove structure of laminated resin material - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove structure for welding laminated resin materials in which a conductive resin layer is sandwiched by insulating resin layers from both sides.

[0002]

2. Description of the Related Art Conventionally, for example, a groove structure as shown in FIG. 4 is known as a groove structure for welding a laminated resin material in which a conductive resin layer is sandwiched by insulating resin layers from both sides. Has been. In this conventional example, the laminated resin material 4 is
A conductive resin layer (electrically conductive by dispersing carbon powder in vinyl chloride resin) for electrically detecting the occurrence of pinholes in the corrosion-resistant layer on the first insulating resin layer (vinyl chloride resin layer) 1. 2) is laminated, and a second insulating resin layer (a vinyl chloride resin layer which is a corrosion resistant layer) 3 is further laminated on the conductive resin layer 2. The ends of the laminated resin materials 4 and 4 are cut obliquely, and the ends 5 and 5 facing each other are arranged adjacent to each other so as to form a groove 6 having a substantially V shape.

When welding a conventional laminated resin material having a groove structure as described above, first of all, a round rod-shaped welding rod (welding material) made of an insulating resin (vinyl chloride resin) is used.
Conductive resin welding rods (welding material) in which the insulating resin layers 1 and 1 are welded and then carbon powder is dispersed in vinyl chloride resin.
Are used to weld the conductive resin layers 2 and 2. After that, the second insulating resin layers 3 and 3 are welded by using a welding rod made of the above-described insulating resin, so that the entire laminated resin materials 4 and 4 are welded.

Conventionally, a structure such as a tank having a predetermined structure is manufactured by welding the laminated resin material 4 in this manner, and a corrosion resistance deterioration detection system (for example, a crack is formed in the second insulating resin layer 3). Insulation is detected by detecting the conduction between the liquid contact side of the second insulating resin layer 3 and the conductive resin layer 2, which is caused by the liquid penetrating the conductive resin layer 2 from this crack. -Resistant resin layer (corrosion-resistant resin layer) 3
System that electrically detects the occurrence of cracks and other deterioration of corrosion resistance).

[0005]

However, in the conventional groove structure, when welding is performed, the first insulating resin layers 1, 1
At the time of welding, the end portion of the conductive resin layer 2 is melted and mixed into the welding bead 1a of the first insulating resin layer (this mixed portion is referred to as "beard" hereinafter) to form a beard 2b. In some cases, the whiskers 2b reach the lower surface of the first insulating resin layer 1 (FIG. 5). Further, when the conductive resin layer 2 is welded, the end portion of the second insulating resin layer 3 is melted and mixed into the welding bead 2a of the conductive resin layer 2, and the narrow V
The surface of the welding bead 2a of the conductive resin layer 2 has a convex and concave shape in the V-shaped groove 6, and when welding the second insulating resin layers 3 and 3, a welding material of the insulating resin is used. It becomes difficult to evenly fill the welded portion with the welded portion, and the bead 2a of the conductive resin layer 2 is mixed into the gap between the welded materials to form the whiskers 2c.
Cause In some cases, the whiskers 2c reach the upper surface of the weld bead 3a of the second insulating resin layer 3 (fifth aspect).
Figure).

In this way, the weld bead 2a of the conductive resin layer 2 becomes the weld bead 1 of the first and second insulating resin layers.
Since it mixes with a and 3a, the operating surface (for example, liquid contact surface) side of the second insulating resin layer 3 and the conductive resin layer 2 are electrically connected, and the above corrosion resistance deterioration detection system does not operate normally. There is a point. Even if the whiskers 2c of the conductive resin layer 2 do not reach the operating surface of the second insulating resin layer 3, the deterioration of the corrosion resistance is erroneously detected if the second insulating resin layer 3 is slightly worn. There is a problem of doing.

The present invention solves the above problems, and provides a groove structure in which the weld beads of the conductive resin layer are less likely to mix with the weld beads of the first and second insulating resin layers. To aim.

[0008]

In order to solve the above-mentioned problems, the groove structure of the laminated resin material of the present invention sandwiches the conductive resin layer from both sides with the first and second insulating resin layers. In the groove structure for welding the laminated resin materials to each other, the first insulating resin layers of the laminated resin materials to be welded to each other are formed with grooves facing each other at positions close to each other. The end portion side of the conductive resin layer is removed in a considerable amount, the end portion is recessed from the end portion of the first insulating resin layer by a considerable distance, and the end portion of the second insulating resin layer is It is characterized in that a part of the side is removed, and the end of the side is set back from the end of the conductive resin layer by a considerable distance.

The cross-sectional shape of the groove formed by the ends of the first insulating resin layer facing each other is preferably substantially V-shaped in order to form a welding bead to improve welding reliability. Is preferred.

[0010]

The end portions of the first insulating resin layers of the laminated resin material to be welded to each other form grooves so as to face each other, and the end portions of the first insulating resin layer are melted and insulated at the time of welding. Of the conductive resin is melted and accumulated in the groove, the first insulating resin layer and the welding material are fused with each other, and the first insulating resin layers are reliably welded to each other. On the other hand, in the conductive resin layer, the corresponding portion on the end side is removed, and the end portion is recessed from the end portion of the first insulating resin layer by a considerable distance. In the welding process, the end portion of the conductive resin layer does not melt and mix into the welding bead of the first insulating resin layer. In addition, since the corresponding portion is also removed from the end portion side of the second insulating resin layer and the end portion is retracted from the end portion of the conductive resin layer by a considerable distance, it is The end portion of the second insulating resin layer does not melt and mix into the welding bead of the conductive resin layer, and large unevenness is unlikely to be formed on the surface of the welding bead. Therefore, in the subsequent step of welding the second insulating resin layer, the welding bead of the conductive resin layer is prevented from being mixed with the welding bead of the second insulating resin layer.

In this way, the insulation between the operating surface (for example, the liquid contact surface) side of the first and second insulating resin layers and the conductive resin layer is reliably maintained.

If the cross-sectional shape of the groove formed by the ends of the first insulating resin layer facing each other is substantially V-shaped, the molten welding material tends to accumulate along the groove. Good weld beads are formed and welding reliability is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a groove structure of a laminated resin material according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. In this embodiment, the same laminated resin material 4 as that used in the above-mentioned conventional example is used as the laminated resin material 4, and the description of the configuration thereof is omitted. The two laminated resin materials 4 and 4 to be welded are arranged so that their ends are opposed to each other at positions close to each other. The ends 10 and 10 of the first insulating resin layer 1 of the laminated resin materials 4 and 4 are diagonally cut so as to face each other and form a substantially V-shaped groove 6a. Further, a considerable portion is removed from the end portion side of the conductive resin layer 2, and the end portion 20 is retracted from the end portion 10 of the first insulating resin layer 1 by a considerable distance, and thus the first insulating property is obtained. The upper surface of the resin layer 1 is exposed for a considerable distance. Further, the corresponding portion of the end portion side of the second insulating resin layer 3 is also removed, and the end portion 30 thereof is set back from the end portion 20 of the conductive resin layer 2 by a considerable distance. The top surface is exposed for a considerable distance.

When welding the laminated resin materials 4 and 4 having the groove structure as described above, the first insulating resin layer 1 is first prepared by using a welding rod (welding material) of an insulating resin (vinyl chloride resin). , 1 are welded. In the welding process of the first insulating resin layer 1, the molten welding material accumulates along the V-shaped groove 6a and is fused with the end portion 10 of the molten first insulating resin layer 1 to form a welding bead. 1a is formed. This ensures that the first insulating resin layers 1 are welded to each other. At this time, since the end portion 20 of the conductive resin layer 2 is retracted from the end portion 10 of the first insulating resin layer by a considerable distance, the conductive resin is not used in the welding process of the first insulating resin layer 1. Edge 20 of layer 2
Will not melt and mix into the welding beads 1a of the first insulating resin layer.

Then, the conductive resin layers 2 and 2 are formed by using a conductive resin welding rod in which carbon powder is dispersed in vinyl chloride resin.
To weld. Also in this case, since the end portion 30 of the second insulating resin layer 3 is retracted from the end portion 20 of the conductive resin layer 2 by a considerable distance, the second insulating layer is used in the welding process of the conductive resin layer 2. The end portion 30 of the conductive resin layer 3 does not melt and mix into the weld bead 2a of the conductive resin layer 2, and large irregularities are unlikely to be formed on the surface of the weld bead 2a.

Then, the second insulating resin layers 3 and 3 are welded using a welding rod made of an insulating resin. At this time,
As described above, the weld beads 2a of the conductive resin layer 2 do not have large irregularities formed on the surface thereof, and the weld beads 2a of the conductive resin layer 2 are welded to the weld beads 3a of the second insulating resin layer 3.
Mixing of a is prevented.

By welding the second insulating resin layer 3 in this manner, the welding process of the laminated resin material 4 is completed, and the laminated resin materials 4 and 4 are securely bonded.

As described above, according to the groove structure of the present invention, the operating surfaces (for example, the liquid contact surface) of the first insulating resin layer 1 and the second insulating resin layer 3 and the conductive resin layer 2 are provided. The insulation between and can be reliably held. And this
Corrosion resistance deterioration detection system (for example, a crack is generated in the second insulating resin layer 3, and the conductive resin layer 2 is cracked from the crack).
By detecting conduction between the liquid contact side of the second insulating resin layer 3 and the conductive resin layer 2 caused by the liquid penetrating into the second insulating resin layer (corrosion-resistant resin layer). )
The system for electrically detecting that a crack has occurred in 3) can be held so as to operate reliably.

In the above embodiment, the case where the insulating resin layers 1 and 3 constituting the laminated resin material 4 are vinyl chloride resin and the conductive resin layer 2 is vinyl chloride resin mixed with carbon powder has been described. However, the material of each layer is not limited to the above examples, other resin materials can be used, and metal powder or conductive resin powder or the like can be used instead of carbon powder. is there.
The first and second insulating resin layers 1 and 3 may be made of the same material or may be different from each other.

Further, although the end faces of the conductive resin layer 2 and the second insulating resin layer 3 are cut vertically in the above-mentioned embodiment, they are cut obliquely at an appropriate angle to form the entire structure of the groove. May be formed in a V shape having a step (that is, a recessed portion of the conductive resin layer 2 and the second insulating resin layer 3).

[0021]

EFFECT OF THE INVENTION The groove structure of the laminated resin material of the present invention is
A groove is formed by making the ends of the first insulating resin layer face each other, and the end of the conductive resin layer is retracted from the end of the first insulating resin layer by a considerable distance, and the second Since the end part of the insulating resin layer is set back from the end part of the conductive resin layer by a considerable distance, the conductive resin layer is mixed in the welding beads of the first and second insulating resin layers in the welding process. Of the first insulating resin layer 1 and the second insulating resin layer 3 to reliably maintain the insulation between the operating surface (for example, the liquid contact surface) of the first insulating resin layer 1 and the conductive resin layer 2. You can

[Brief description of drawings]

FIG. 1 is a front view showing a groove structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing a groove structure according to an embodiment of the present invention.

FIG. 3 is a front view showing a state in which a laminated resin material having a groove structure of the present invention is welded.

FIG. 4 is a front view showing a conventional groove structure.

FIG. 5 is a front view showing a state in which a laminated resin material having a conventional groove structure is welded.

[Explanation of symbols]

 1 1st insulating resin layer 2 electroconductive resin layer 3 2nd insulating resin layer 10 edge part of 1st insulating resin 20 edge part of electroconductive resin layer 30 edge part of 2nd insulating resin layer 6a V-shaped groove

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Claims (2)

[Scope of utility model registration request] 1. A groove structure for welding a laminated resin material in which a conductive resin layer is sandwiched between first and second insulating resin layers from both sides, in a groove structure for welding the first laminated resin material to be welded to each other. The grooves of the insulating resin layer face each other at positions where the ends of the insulating resin layer are close to each other, and the end portion side of the conductive resin layer is considerably removed, and the end portion of the first insulating resin layer is formed. Of the second insulating resin layer is removed from the end of the second insulating resin layer, and the end of the second insulating resin layer is removed from the end of the conductive resin layer by a considerable distance. A groove structure of a laminated resin material characterized by the above. 2. The groove structure of the laminated resin material according to claim 1, wherein the groove formed by the end portions of the first insulating resin layer facing each other has a substantially V-shaped cross section. .