JPH0454201Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a resin welding rod used when welding resin composite plates in a butt-like manner.

(Prior art) Generally, when welding resin plates butt-like,
A welding rod made of the same resin material as this resin plate is used, but it is desirable to weld each layer separately using a welding rod made of the same resin material for the resin composite plate as well. For example, vinylidene fluoride (PVDF)
It is abbreviated as ) and polyvinyl chloride (hereinafter abbreviated as PVC), when welding a resin composite plate made of
It goes like this: This PVDF resin and PVC
Since it cannot be directly welded to resin, it is usually joined with acrylic resin as shown in FIGS. 11 to 16.

As shown in the figure, the composite plate 1 has PVDF resin layers 4 and 4' formed on both sides of the PVC resin layer 2 with acrylic resin layers 3 and 3' interposed therebetween, and the welding points are usually held at an angle of 30 degrees. The two composite plates 1, 1 thus formed are placed facing each other in a butt-like manner so that the inclined surfaces AS, S face each other.

First, using a welding rod 5 made of PVDF resin, weld the PVDF exposed on the slopes S and S as shown in FIG.
The end surfaces of the resin layers 4, 4 and the tip of the welding rod 5 are melted with hot air, and a gap is formed between the PVDF resin layers 4, 4.
A joint portion 5a made of PVDF resin material is formed.

Next, using a welding rod 6 made of acrylic resin material, as shown in FIG. The acrylic resin layer 3 is melted to form a joint 6a made of acrylic resin material between the acrylic resin layers 3, 3.

Next, using a welding rod 7 made of PVC resin material,
Exposed on slopes S and S as shown in Figure 13
PVC resin layers 2, 2 end surfaces, and the upper surface of the welded part 6a,
The tip of the welding rod 7 is melted with hot air to form a joint 7a made of PVC resin material between the PVC resin layers 2, 2. At this time, the PVC resin layer 2,
2 has a large thickness, so the bonding can be performed in multiple steps. Thereafter, a joint 6'a is similarly formed between the acrylic resin layers 3', 3', and a joint 5'a is formed between the PVDF resin layers 4', 4'.

As described above, each layer has joint parts 5a, 6a, 7a.
The welding method performed by forming a
Good results were obtained; in other words, since the joints 5a to 7a and the resin layers 2 to 4 are made of the same resin material, the joints are reliable, and the joints 5a and 7a and the joint 6a are Since it is a resin material that can be welded, reliable joining is performed, and the welded parts are securely integrated as a whole.

(Problem to be solved by the invention) However, when welding is performed using welding rods corresponding to each layer as described above, it is only effective when the resin composite plate has sufficient thickness. If the thickness is small, welding is very difficult. That is, when the welding rods 5 to 7 are melted to form the joints 5a to 7a as described above, the welding rods 5
-7 must be pressed against the welding area with a predetermined pressure, and if this pressing pressure is insufficient, the welding strength will be extremely reduced. Therefore, the welding rod needs to be strong enough to withstand the pressing pressure, in other words, it needs to be thick enough, and it is usually at least 2 mm thick, and optimally about 3 to 4 mm thick, and welding of such a thick When welding a thin composite plate using a rod, the 17th
As shown in the figure, the joint 5a formed between the PVDF resin layers 4, 4 crosses over the acrylic resin layers 3, 3, and the PVC
It will swell up between the resin layers 2 and 2,
Non-welded areas occur between the joint portion 5a and the PVC resin layers 2, 2, and the welding strength becomes extremely poor. In particular, since PVDF resin material is expensive, if a material of about 1 mm from the two outer surfaces is used, there will always be some non-welded spots.

Furthermore, three types of welding rods had to be prepared for the welding work, and the number of man-hours required was very high, making the welding process extremely complicated and time-consuming.

(Means for Solving the Problems) The present invention was devised to solve the above problems, and is a rod-shaped member formed of a resin material that can be welded to at least two types of resins constituting a resin composite board. and a rod-shaped member made of the same resin as at least one of the resins constituting the composite plate are joined along the length direction.

(Function) By joining two types of rod-shaped members as described above, the required thickness of the welding rod can be secured, and even when welding thin resin composite plates, the joints can be adjusted for each layer. This prevents the joints formed in one layer from protruding into other joints.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

The welding rod of the present invention, generally indicated by number 10 in the drawings, is constructed by joining two rod-shaped members 11 and 12 along the length direction. One rod-shaped member 11 is a PVC resin layer 2 that constitutes the resin composite board 1.
and the PVDF resin layer 4 are made of an acrylic resin material that can be welded to both the rod-shaped member 12 and the PVDF resin layer 4.
It is made of PVDF resin material. These two rod-shaped members 11 and 12 may be joined by melting or co-extrusion molding, and in this joining, they may be joined by 1/2 of the whole in cross section as shown in FIG. 2, but as shown in FIG. As shown in , one side may be made thicker and the other side may be made thinner to meet the required amount, and in this case, the joint surface a may be made into an arc. Further, the cross-sectional shape of each of the rod-shaped members 11 and 12 is not limited to a semicircular shape, and for example, a convex portion 13 or a concave portion 14 may be formed as shown in FIG. As shown, a rod-shaped member 12 made of PVDF resin and
A rod-shaped member 15 made of PVC resin material is formed,
Both rod-shaped members 12 and 15 may be joined along the length direction on the outside of the rod-shaped member 11 to form a so-called three-layer structure.

Therefore, when welding two resin composite plates 1, 1 in a butt-like manner, the welding rod 10 as shown in FIG.
The welding rod 10 is placed at the welding location with the rod-shaped member 11 on the upper side and the rod-shaped member 12 on the lower side, and the tip of the welding rod 10 is melted with hot air in the usual manner. At this time, as shown in FIG. 8, the melted material of the rod-shaped member 12, that is, the PVDF resin material is located on the lower side, and the melted material of the rod-shaped member 11, that is, the acrylic resin material is located on the upper side. 1,1 PVDF resin layer 4,
A joint 12a made of a PVDF resin material is formed between the two acrylic resin layers 3, and a joint 11a made of an acrylic resin material is formed between the acrylic resin layers 3, 3. After this, as shown in Fig. 8, using an ordinary welding rod 7 made only of PVC resin material,
A joint 7a made of PVC resin material is formed, and then, using the welding rod 10 of the present invention, as shown in FIG. Accordingly, joint portions 11'a and 12'a are formed in a conventional manner.

In addition, in this invention, since the welding rod 10 has a certain direction during welding, each member 11, 12 is color-coded, and the fourth
As shown in the figure, a convex portion 13 and a concave portion 14 are formed to determine the orientation of the welding rod 10.

Further, when the convex portion 13 is formed in this manner, the convex portion 13 can be easily positioned between narrow resin layers.
Further, when the welding rod 10 has a cross-sectional shape as shown in FIG. 3, it is easy to make the resin material horizontal during melting. Furthermore, when the welding rod 10 has a three-layer structure as shown in FIG. 5, it is suitable for welding very thin resin composite plates.

Also, as the welding rod 10, PVC as shown in Fig. 6 is used.
Rod-shaped member 1 made of resin material and acrylic resin material
5 and 11 may be joined together. In this case, if we first weld between the PVDF resin layers 4 and 4 with a welding rod made of PVDF resin material, and then weld it with the rod-shaped member 11 of the welding rod 10 of this embodiment on the lower side, the acrylic resin layers 3 and 3 can be welded together. A joint made of acrylic resin is formed, and a joint is formed between the PVC resin layers 2 and 2 at the bottom.
A joint made of PVC resin material is formed. From now on
By sequentially welding using the PVC welding rod 7, the welding rod 10 with the rod-shaped member 15 of this embodiment on the lower side, and the PCDF welding rod, the resin composite plates 1, 1 are joined. In this way, both the front and back surfaces of the welded parts of the composite plates 1, 1 will be reliably covered with the PVDF resin material.
This welding rod 10 is particularly preferably employed when the PVDF resin layer 4 is thick.

(Effects of the invention) As explained above, the welding rod according to the invention is formed by separately forming rod-shaped members from two or more types of resin materials and joining the rod-shaped members along the length direction. Therefore, it is possible to secure the necessary thickness as a welding rod, and even with thin resin composite plates, it is possible to form joints between each resin layer and ensure the unification of the welded parts. I can,
This made it possible to achieve extremely high welding strength.

Further, it has practical effects, such as requiring only two types of welding rods to be prepared during welding work, and requiring fewer man-hours.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view showing the state of use, Fig. 2 is a sectional view, Figs. 3 to 6 are sectional views of different structures, and Figs. 7 to 10. The figure is an explanatory diagram of a welding operation, and FIGS. 11 to 17 are explanatory diagrams of a conventional welding operation. 1...Resin composite board, 2...PVC resin layer, 3,
3'... Acrylic resin layer, 4, 4'... PVDF resin layer, 10... Welding rod, 11, 12... Rod-shaped member.

Claims (1)

[Scope of utility model registration request] A resin welding rod for welding a resin composite plate, comprising a rod-shaped member made of a resin material that can be welded to at least two types of resin that make up the resin composite plate, and at least one resin that makes up the composite plate. 1. A welding rod for a resin composite plate, characterized in that a rod-shaped member made of the same resin material is joined along the length direction.