JPH1134180A - Hollow resin container and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the generation of flashes on the inner side of the hollow resin container by enyloying a simple manufacturing method and a manufacturing device. SOLUTION: The sectional shape of a hot plate 30 along the peripheral directions of a bonding section 10A of an intermediate molded product 10 and a bonding section 12A of an intermediate molded product 12 is constituted of an inside heating section 40 positioned on the inner sides of the intermediate molded products 10 and 12 and a bonding section heating section 42 crossing the inside heating section 40 into the T-shape. Both of the bonding section 10A of the intermediate molded product 10 and the bonding section 12A of the intermediate molded product 12, therefore, are melted by the bonding section heating section 42 of the hot plate 30, and also both of a site 10C adjacent to the bonding section 10A out of an inner face 10B of the intermediate molded product 10 and a site 12C adjacent to the bonding section 12A out of an inner face 12B of the intermediate molded product 12 are melted by the inside heating section 40 of the hot plate 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hollow resin container and a method of manufacturing the same, and more particularly, to a hollow resin container such as a fuel tank mounted on an automobile and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as one method of manufacturing a hollow resin container, there is a method in which a plurality of divided intermediate molded products made of resin are integrally formed into a hollow shape by welding their joint surfaces. However, in this method, when welding the joint surface, a burr is generated by pressing the unmelted portion adjacent to the welded portion in the butting direction. Among these burrs, burrs generated outside the hollow resin container can be easily removed using a tool, but burrs generated inside the hollow resin container are difficult to remove.

As a method for improving this, Japanese Patent Application No. Hei 8-2
There is a method disclosed in Japanese Patent No. 16259.

As shown in FIG. 7, according to the method for manufacturing a hollow resin container, dividedly formed works 100 and 102 are formed.
Is formed into a hollow shape by vibration welding, a rubber bag 104 is provided inside the hollow portion, and the bag 10 is
4 is filled with a pressurized fluid and expanded so that each work 1
The burrs 10 generated inside the hollow resin container are brought into contact with the inner surfaces 100A, 102A of
6 is pressed into the burr pool 108 to prevent the burr 106 from protruding into the hollow resin container.

[0005]

However, in such a method for manufacturing a hollow resin container, it is necessary to provide a rubber bag 104 inside the hollow resin container and to add a rubber bag 104 to the inside of the bag 104. Since the pressurized fluid needs to be filled, the manufacturing method becomes complicated and the manufacturing apparatus becomes complicated.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a hollow resin container capable of eliminating burrs inside the hollow resin container with a simple manufacturing direction and a simple manufacturing apparatus, and a method for manufacturing the same.

[0007]

According to a first aspect of the present invention, there is provided a hollow resin container in which a plurality of resin-made intermediate molded articles are welded by overlapping peripheral portions thereof, and wherein the plurality of resin-made intermediate molded products are welded when the peripheral portions are welded. By melting each joint of the molded article and a portion of the inner surface of the plurality of resin-made intermediate molded articles adjacent to the joint, there is no burr in the welded portion inside the container. I have.

Therefore, when the joints of the resin layers are welded to each other at the time of manufacturing, a portion of the inner side surfaces of the plurality of resin-made intermediate molded products adjacent to the joint is also melted.
The burr generating portion adjacent to the joining portion is melted, the joining portion inside the hollow resin container and the vicinity thereof are smoothly continuous, and the burr inside the hollow resin container can be eliminated. As a result, there is no need to provide a rubber bag inside the hollow resin container as in the related art, and there is no need to fill the inside of the bag with a pressurized fluid. This makes it possible to eliminate burrs inside the hollow resin container.

According to a second aspect of the present invention, there is provided a method of manufacturing a hollow resin container in which peripheral portions of a plurality of resin-made intermediate molded products are overlapped and welded. It is characterized in that each joint and a portion of the inner side surfaces of the plurality of resin-made intermediate molded products adjacent to the joint are melted.

Therefore, at the time of welding the joints of the resin layers to each other at the time of manufacturing, a portion adjacent to the joint on the inner side surface of the plurality of resin-made intermediate molded products is also melted.
The burr generating portion adjacent to the joining portion is melted, the joining portion inside the hollow resin container and the vicinity thereof are smoothly continuous, and the burr inside the hollow resin container can be eliminated. Also, there is no need to provide a rubber bag inside the hollow resin container as in the past, and there is no need to fill the inside of the bag with a pressurized fluid. Burrs on the inside of the hollow resin container can be eliminated.

According to a third aspect of the present invention, there is provided the method for manufacturing a hollow resin container according to the second aspect, wherein after solidifying an outer portion of the container at the joint portion, the internal pressure of the plurality of resin-made intermediate molded products is increased. The inner part of the container at the joint is solidified in a state in which the container is raised.

Therefore, when the joints of the resin layers are welded to each other at the time of manufacturing, the outer portion of the container at the joint is solidified, and then the inner pressure of the plurality of resin-made intermediate products is increased while the inner pressure of the plurality of resin-made intermediate products is increased. In order to solidify the part, the molten resin is pressed by the internal pressure at the inner part of the container at the joint, but since the outer part of the container at the joint is already solidified, the outward flow of the molten resin is suppressed, The flow of the molten resin is directed toward the bonding surface. As a result, the surface pressure of the joint surface increases, and the adhesion after solidification can be reliably performed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The hollow resin container of the present invention (for example,
A first embodiment of a method for manufacturing a fuel tank for an automobile and a manufactured hollow resin container will be described in detail with reference to FIGS. 1 to 5.

As shown in FIG. 1, in the first embodiment, a resin intermediate molded product 1 having a concave shape and an opening peripheral portion is provided.
A pair of molds 14 (upper mold) and mold 16 of welding press
(Lower mold).

Each of the resin intermediate molded products 10 and 12 is formed by injection molding or the like.
Are provided with accessory parts such as a cut-off valve 18.

[0016] As shown in FIG.
Reference numeral 8 denotes a pipe for removing gas accumulated in the upper portion of the fuel tank when fuel is supplied through an inlet pipe 22 to a fuel tank as a hollow resin container 20 including an upper intermediate molded product 10 and a lower intermediate molded product 12. And closes when the fuel rises to the valve position,
If the fuel level is below the valve position, it will be open. The gas released from the cutoff valve 18 is released to the outside through a pipe (not shown) passing through the fuel pump mounting opening 24.

As shown in FIG. 5, the sub-tank 26 and the separator 28, which are accessory parts formed on the lower intermediate molded product (the lower part of the fuel tank) 12, are integrally formed at the time of molding the lower intermediate molded product.

As shown in FIG. 1, a hot plate 30 is disposed between the joint 10A of the intermediate molded product 10 and the joint 12A of the intermediate molded product 12, and the hot plate 30 Both the joint 10A of the molded article 10 and the joint 12A of the intermediate molded article 12 are melted and welded.

As shown in FIG. 4A, the intermediate molded product 1
The cross-sectional shape of the hot plate 30 along the circumferential direction between the joint 10A of No. 0 and the joint 12A of the intermediate molded product 12 is
It comprises an inner heating section 40 located inside 0 and 12, and a joining section heating section 42 which intersects the inner heating section 40 in a T-shape.

Therefore, when the heating plate 30 is heated, the heating plate 3
In addition, both the joining portion 10A of the intermediate molded product 10 and the joining portion 12A of the intermediate molded product 12 are melted by the joint heating portion 42, and the inner surface of the intermediate molded product 10 is heated by the inner heating portion 40 of the hot plate 30. 10B, a portion 10C adjacent to the joining portion 10A and a portion 12C of the inner surface 12B of the intermediate molded product 12 adjacent to the joining portion 12A are both melted. In FIG. 4A, the intermediate molded product 1 is shown.
The molten portions 0 and 12 are indicated by mesh hatching.

Then, together with the pair of molds 14 and 16,
The direction in which the intermediate molded product 10 and the intermediate molded product 12 are separated (FIG. 1
Is moved to a predetermined distance in the direction indicated by the arrow A in FIG.
To the arrow B). Then, a pair of molds 14 and 16
At the same time, the intermediate molded product 10 and the intermediate molded product 12 are moved in a direction of approaching (arrow C in FIG. 1), and are brought into the joined state in FIG.

As shown in FIG. 2, when the joint 10A of the intermediate molded product 10 and the joint 12A of the intermediate molded product 12 come into contact with each other, the already melted joint 10A and the joint 12A are welded to each other. .

At this time, in the first embodiment, the inner surface 10B of the intermediate molded product 10 is
Among these, both a portion 10C adjacent to the joint 10A and a portion 12C of the inner surface 12B of the intermediate molded product 12 adjacent to the joint 12A are molten. That is, since the burr generating portion adjacent to the joining portion is melted, the joining portion 10 of the inner surface 10B of the intermediate molded product 10 as shown in FIG.
A portion 10C adjacent to A and the inner surface 12 of the intermediate molded product 12
Both of the portion B and the portion 12C adjacent to the joining portion 12A are smoothly continuous, and burrs inside the hollow resin container 20 can be eliminated.

Accordingly, as shown in FIG. 3, no burr is generated inside the hollow resin container 20 at the joint 20A of the fuel tank as the hollow resin container 20 which is removed from the welding press mold after cooling. FIG. 4 (B)
As shown in (2), burrs 44 are generated outside the hollow resin container 20 at the joint portion 20A of the fuel tank as the hollow resin container 20, which can be easily removed by using a tool.

In the first embodiment, there is no need to provide a rubber bag inside the hollow resin container as in the prior art, and it is not necessary to fill the inside of the bag with a pressurized fluid. Therefore, burrs inside the hollow resin container can be eliminated by a simple manufacturing direction and a simple manufacturing apparatus.

Next, a second embodiment of the method for manufacturing a hollow resin container of the present invention will be described in detail with reference to FIGS. 6 (A) and 6 (B).

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, as shown in FIG. 6A, the joint 10A of the intermediate molded product 10 and the intermediate molded product 1
The cross-sectional shape of the hot plate 30 along the circumferential direction with the second joint 12A is heated at the joints 10A and the portions 10D, 12D having a triangular cross-section formed adjacent to the inner side of the container of the joint 12A. An inner heating portion 46 having a trapezoidal cross section, and the inner heating portion 46 intersects with the inner heating portion 46 in a Y-shape.
And a joint heating section 48 for heating the outer portion of the above.

In FIG. 6A, the intermediate molded products 10, 1
2 are indicated by mesh hatching.

As shown in FIG. 6B, in the second embodiment, the joint 10A of the intermediate molded product 10 and the intermediate molded product 1
When welding the second joint portion 12A, the hollow resin container 20
After solidifying only the outer portion of the joint 20A, the internal pressure of the hollow resin container 20 is increased. As a result, the internal pressure (FIG. 6)
By the arrow P1) of (B), the molten resin (the hatched portion) of the portions 10D and 12D which are the inner portions of the container of the joining portion 20A is pressed, but the outer portion of the container of the joining portion 20A is solidified. Therefore, the outside of the molten resin (FIG. 6 (B)
(In the direction of arrow P1 in FIG. 6) is suppressed, and the flow of the molten resin goes in the direction of the joining surface (in the direction of arrow P2 in FIG. 6B).
As a result, the surface pressure (arrow P2 in FIG. 6B) on the inner side of the joining surface 20A increases, and the welding strength after solidification increases.

Also in the second embodiment, similar to the first embodiment, burrs are generated inside the hollow resin container 20 at the joint 20A of the fuel tank as the completed hollow resin container 20. Instead, the burrs 44 generated outside can be easily removed using a tool.

In the second embodiment, the joint 10A
The internal pressure P1 is efficiently converted to the surface pressure P2 because the shapes of the portions 10D and 12D inside the joint portion 12A and the inside of the joint 12A are triangular in cross section, but the first embodiment having no inclined surface (FIG. (See FIG. 4A and FIG. 4B.) Even when the hot plate 30 shown in FIG. 4B is used, when the joint 10A of the intermediate molded product 10 and the joint 12A of the intermediate molded product 12 are welded to each other, When the internal pressure of the hollow resin container 20 is increased after solidifying only the outer portion of the container, since the outer portion of the joining surface 20A is solidified, the outward flow of the molten resin is suppressed,
As a result of the flow of the molten resin flowing toward the bonding surface, the bonding surface 20
The surface pressure of the inside of A increases, and the welding strength after solidification increases.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included in the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in the first and second embodiments, a fuel tank of an automobile is taken as an example of the hollow resin container 20, but the hollow resin container 20 is not limited to a fuel tank of an automobile, and may be another hollow resin container. Also, in the first and second embodiments, the hollow resin container 20 is divided into two intermediate resin molded products 10 and 12, but the hollow resin container is
It may be divided into two or more resin intermediate molded products.

[0034]

According to the first aspect of the present invention, there is provided a hollow resin container in which peripheral portions of a plurality of resin-made intermediate molded products are overlapped and welded, and each of the plurality of resin-made intermediate molded products is joined when the peripheral portions are welded. And the portion of the inner surface of the plurality of resin-made intermediate molded products adjacent to the joint is melted, so that there is no burr at the welded portion inside the container. It has an excellent effect that burrs inside the resin container can be eliminated.

According to a second aspect of the present invention, there is provided a method for manufacturing a hollow resin container in which peripheral portions of a plurality of resin-made intermediate molded products are overlapped and welded. Since the joint and the portion of the inner surface of the plurality of resin-made intermediate molded products adjacent to the joint are melted, it is possible to eliminate burrs inside the hollow resin container by a simple manufacturing direction and a simple manufacturing apparatus. Has excellent effects.

According to a third aspect of the present invention, there is provided a method of manufacturing a hollow resin container according to the second aspect, wherein after solidifying the outer portion of the container at the joint portion, the internal pressure of the plurality of resin-made intermediate molded products is increased. Since the inner portion of the container at the joining portion is solidified in the assembled state, in addition to the effect described in claim 2, there is an excellent effect that adhesion can be surely performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an apparatus and a container showing a state during heating in an intermediate molded article joining step of a method for manufacturing a hollow resin container according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the apparatus and the container, illustrating a joining process in an intermediate molded article joining step of the method for manufacturing a hollow resin container according to the first embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a container manufactured by the method for manufacturing a hollow resin container according to the first embodiment of the present invention.

FIG. 4A is an enlarged cross-sectional view of an apparatus and a container, showing a state during heating in an intermediate molded article joining step of the method for manufacturing a hollow resin container according to the first embodiment of the present invention, and FIG. FIG. 3 is an enlarged cross-sectional view of the container, illustrating a joining step in an intermediate molded article joining step of the method for manufacturing a hollow resin container according to the first embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a container manufactured by the method for manufacturing a hollow resin container according to the first embodiment of the present invention.

FIG. 6A is an enlarged cross-sectional view of an apparatus and a container, showing a state during heating in an intermediate molded article joining step of a method for manufacturing a hollow resin container according to a modification of the second embodiment of the present invention; FIG. 6B is an enlarged cross-sectional view of the container, illustrating a joining step in an intermediate molded article joining step of the method for manufacturing a hollow resin container according to a modification of the second embodiment of the present invention.

FIG. 7 is a cross-sectional view of an apparatus and a container, illustrating a joining process in an intermediate molded article joining step of a method for manufacturing a hollow resin container according to a conventional embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Resin intermediate molded article 10A Joint part of resin intermediate molded article 10B Inner surface of resin intermediate molded article 10C Area adjacent to joint part on inner surface of resin intermediate molded article 10D Joined of inner surface of resin intermediate molded article 12A Resin intermediate molded product 12A Joint portion of resin intermediate molded product 12B Inner surface of resin intermediate molded product 12C Region of resin internal molded product adjacent to joint 12D Intermediate molded product of resin Of the inner surface of the portion adjacent to the joining portion 14 Upper die of the welding press 16 Lower die of the welding press 30 Hot plate 40 Inner heating part 42 Joint heating part 46 Inner heating part

Claims (3)

[Claims] 1. A hollow resin container in which peripheral portions of a plurality of resin-made intermediate molded products are overlapped and welded, wherein at the time of welding of the peripheral portions, each joint portion of the plurality of resin-made intermediate molded products and the plurality of resin-made intermediate products are provided. A hollow resin container, characterized in that a portion adjacent to the joining portion on the inner side surface of the intermediate molded product is melted so that a welded portion inside the container has no burrs. 2. A method of manufacturing a hollow resin container in which peripheral portions of a plurality of resin-made intermediate molded products are overlapped and welded to each other, wherein at the time of welding the peripheral portions, each joint portion of the plurality of resin-made intermediate molded products; And melting a portion of the inner side surface of the resin intermediate molded product adjacent to the joint portion. 3. The container inner portion of the joint portion is solidified while the internal pressure of the plurality of resin-made intermediate molded products is increased after the container outer portion of the joint portion is solidified. 3. The method for producing a hollow resin container according to 2.