JPH0734947B2 - Pressure vessel and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pressure container such as an aerosol container, and more particularly to a container of a type in which a bottom portion of the container is adhered and fixed to a body portion, and an inner peripheral surface of the body portion. In addition to increasing the adhesive area with the peripheral wall of the bottom plate, improving the sealability of the adhesive part by preventing the cured state of the adhesive from clumping, and against the deformation of the constituent wall surface when internal pressure change or impact load is applied. This is to prevent damage to the seal portion.

[Prior Art and its Problems] Narrow-mouth pressure vessels are used in large quantities as aerosol containers, etc., but in the past, a bottomed barrel was manufactured and this opening was made into a narrow mouth by necking. A lid having a valve device is attached to the part.

However, in this conventional type, for example, a material having a high workability such as aluminum is used, and the pressure resistance is inevitably low.

Therefore, in the case of a pressure vessel that requires further pressure resistance,
As shown in FIG. 7 and FIG. 8, a tubular body (1) with a narrow mouth open at the lower end is once manufactured, and a bottom plate (2) separately formed at this lower end open portion (11) is bonded and caulked. A pressure vessel of the type to be mounted by is proposed in JP-A-49-125917.

In this conventional one, a narrow-mouthed tubular body (1) having an open lower end is manufactured in advance, so that the body of the container can be manufactured by using a hard metal material other than aluminum, such as a steel plate. There is.

However, in this conventional one, after the separate bottom plate (2) is press-fitted and adhered to the lower end opening portion (11) of the body portion, the lower end of the body portion is bent inward to caulk the adhered portion. Therefore, the pressure resistance is sufficient, but the sealing property and the strength of the seal portion are insufficient.

This is because when the adhesive (3) is applied to the inner peripheral surface of the lower end opening (11) and the bottom plate (2) is press-fitted, the skirt portion (21) at the peripheral edge of the bottom plate (2) is press-fitted. And adhesive (3)
Gather on the inner edge of the skirt (21) so as to be shaved from the inner peripheral surface of the tubular body (1), and when the press-fitting is completed, the assembly adhesive is convex at the center of its cross section. This is because it becomes a lumped shape and the lumped portion is continuous over the entire area around the bottom plate (2). In addition, a curable adhesive having excellent adhesive strength is used as the adhesive (3).

That is, since the adhesive (3) applied to the inner peripheral surface of the lower end opening portion (11) as described above is shaved by press fitting, when the press fitting is completed, the outer peripheral surface of the skirt portion (21) and the lower end opening portion (1) are
The adhesive (3) hardly exists between the inner peripheral surface of 1), and the seal is secured mainly by the above-mentioned lumpy portion.

Therefore, the area of adhesion between the bottom plate (2) and the inner wall surface of the adhesive (3), which adhere to the adhesive (3), is small, and the sealing property becomes insufficient.

Moreover, since the adhesive (3) is in the form of a lump, and further, because the adhesive (3) is a curable adhesive, the flexibility of the adhesive (3) is insufficient, and caulking is stopped. In this state, when the inner pressure of the tubular body (1) changes or the impact load is applied to deform the end plate portion or the lower end open portion (11) of the bottom plate (2), the adhesion to the contact wall surface is easily peeled off. As a result, the durability of the seal portion becomes insufficient.

． Regarding the first invention [Technical problem] The present invention is directed to a bottom plate having a skirt portion (21) at the lower end open portion (11) of a tubular body (1) formed in such an open state as described above. Skirt (21) by press-fitting or fitting (2)
The lower end opening portion (11) and the lower end opening portion (11) are adhered to each other by an adhesive agent (3), and the lower end opening portion (11) is bent inward to caulk the bottom plate (2) to fix the adhesive agent (3). In order to improve the sealability of the seal portion by the adhesive (3) in the pressure vessel of the dry-hardening type, and to prevent the deterioration of the sealability and the damage of the seal portion due to the deformation of the wall surface of the container in the seal portion. Skirts (21)
It is a technical issue to prevent the adhesive gathering at the inner edge of the from becoming a convex mass at the center of the cross section.

[Technical Means] The technical means of the present invention taken to solve the above technical problem is that "the adhesive (3) is a fitting portion between the tubular body (1) and the bottom plate (2)," The tubular body (1) is continuously interposed in the range between the inner peripheral surface of the tubular body (1) near the fitting portion and the inner edge of the skirt portion (21), and The adhesive portion interposed between the inner peripheral surface of the base plate and the inner end edge of the skirt portion (21) extends from the portion along the end plate portion (22) of the bottom plate (2) to the inner peripheral surface of the tubular body (1). It has a substantially V-shaped cross section ".

[Operation] The above technical means of the present invention operates as follows.

The adhesive portion interposed between the outer peripheral edge of the end plate portion (22) and the inner peripheral surface of the tubular body (1) is formed from the portion along the end plate portion (22) of the bottom plate (2) to the tubular body (1). ) Is formed in a substantially V-shaped cross section so as to face the inner peripheral surface, the adhesive (3)
Has a substantially uniform thickness from the tubular body (1) to the end plate portion (22). Therefore, when the wall surface of the body portion of the end plate portion (22) and the tubular body (1) is deformed, the adhesive (3) in the portion is easily deformed following this deformation.

Even if a certain amount of the adhesive (3) is used, the contact area between the adhesive (3) and the inner peripheral surface of the tubular body (1) and the peripheral edge of the end plate portion (22) is this portion. The amount of the adhesive is larger than that of the conventional adhesive, which is convex at the center.

[Effects] The present invention having the above-described configuration has the following unique effects.

When the end plate portion (22) and the body wall surface of the tubular body (1) are deformed, the adhesive portion having a V-shaped cross section interposed therebetween is likely to be deformed following this deformation, so that the internal pressure change It is possible to prevent the inconvenience that the seal portion is damaged or the sealing property is deteriorated by the impact load or the impact load.

Further, the contact area between the adhesive (3) and the inner peripheral surface of the tubular body (1) and the peripheral edge of the end plate portion (22) is larger than that of the conventional one because of the reason described above. The sealing property is improved as compared with the above.

． Regarding the second invention, [Technical Problem] In the production of the pressure vessel of the first invention, the productivity of the pressure vessel is increased and the conventional production process is not significantly changed. The technical problem is to be able to manufacture a pressure vessel.

[Technical Means] The technical means of the second invention taken in order to solve the above technical problem is "annular adhesion to the inner peripheral surface near the lower end opening (11) of the tubular body (1). The step of applying the agent (3), the step of press-fitting or fitting the bottom plate (2) through the lower end opening portion (11), and the tubular body (1) with the bottom plate (2) inserted into the lower end opening portion (11). Bend inward to make the skirt (2
1) and a step of stopping the crimping, and the tubular body (1) is maintained in an inverted state for a certain time during the step of stopping the crimping and / or the subsequent step.

[Operation] The technical means of the second invention operates as follows.

For the application of the adhesive (3) and the press-fitting of the bottom plate (2), the same method as the conventional manufacturing method described above is adopted. Then, the tubular body (1) is maintained in the inverted state, and the skirt portion (21) of the bottom plate (2) is caulked. During the crimping step and / or the subsequent upright maintenance time until the subsequent step, the adhesive gathered in a lump in the central portion of the end plate portion (22) after the bottom plate (2) is press-fitted. In (3), since the tubular body (1) is in an inverted state, the adhesive (3) in contact with the tubular body (1) runs along the inner peripheral surface of the tubular body (1). Run down a certain range.

Therefore, the adhesive agent (3) having a convex shape at the center flows to the inner peripheral surface side of the tubular body (1), and the amount of the adhesive agent (3) at the center portion becomes small. That is, the cross section of the gathered portion of the adhesive (3) is substantially V-shaped. In this state, the adhesive (3)
When the material is dried and hardened, the bottom plate (2) and the tubular body (1) are surely bonded to each other over the entire peripheral edge of the bottom plate (2), and the first pressure vessel is completed.

[Effects] The present invention having the above-described configuration has the following unique effects.

After the bottom plate (2) is press-fitted into the tubular body (1), the tubular body (1) is set upside down to allow the adhesive (3) to flow down. As the coating work, there is no need to perform any special work, and since the pressure vessel of the first invention of the process which is almost the same as the conventional process can be manufactured,
It will be highly productive.

[Embodiment] Hereinafter, in order to explain an embodiment of the first invention and the second invention, an embodiment of the second invention will be mainly described with reference to FIGS. 1 to 6. To do.

In the manufacturing method of this embodiment, the configurations of the cylindrical body (1) and the bottom plate (2) are almost the same as those of the conventional one described above, and in the step of applying the adhesive (3), the lower end opening (11) The adhesive (3) is applied in a ring shape on the inner peripheral surface of the cylindrical body (1) in the vicinity.
In this application step, as shown in FIG. 5, the nozzle for ejecting the adhesive (3) is opposed to a predetermined position on the inner peripheral surface of the cylindrical body (1) in a rotating state (150 rpm), When the adhesive (3) is discharged from this nozzle at a constant discharge rate (eg 18 cc / min), a predetermined amount of the adhesive (3) is applied, and as shown in FIG. 1, the lower end opening (11) The adhesive agent (3) is applied in a ring shape in the vicinity of. The application position of the adhesive (3) is located within the contact area between the skirt portion (21) and the lower inner surface of the tubular body (1) when the bottom plate (2) is press-fitted.

Then, the bottom plate (2) is press-fitted from the lower end open part (11) side of the tubular body (1) coated with the adhesive (3), and as shown in FIG. 2, the skirt part (21) of the bottom plate (2). ) And the lower end opening (11) are aligned. In this state, the adhesive (3)
As shown in the same figure, they are in a state where they are gathered in a lump in the outer peripheral edge portion of the end plate portion (22).

After that, the combination of the tubular body (1) and the bottom plate (2) is turned upside down, and the lower end opening portion (11) is bent inward as shown in FIGS. 3 and 4 and curled. This curling method is the same as a known method, but at the time of the curling processing, the bonding portion between the bottom plate (2) and the tubular body (1) is
Since it is in a non-hardened state, the bottom plate (2) is pushed inward (upward in the upright state of the tubular body (1)) as the lower end opening portion (11) is bent inward, and the curling is performed. At the end point, as shown in FIG. 4, a curl portion is formed over the entire circumference so as to surround the tip of the skirt portion (21), and the skirt portion (21) is pressed by the edge of the curl portion. It will be.

In the method of this embodiment, the joint between the bottom plate (2) and the tubular body (1) is temporarily heated during the step of curling by curling. As a result, even in the case of the curable adhesive (3), its viscosity is temporarily and extremely reduced, and the block-shaped adhesive (3) gathered at the peripheral portion of the end plate portion (22) becomes a tubular body ( It becomes easy to flow down along the inner peripheral surface of 1). Therefore, the cross section of the gathered portion of the adhesive (3) is deformed into a V shape in a very short time.

Even after returning the tubular body (1) equipped with the bottom plate (2) to the upright state after the completion of the crimping, the ambient temperature is lowered, so that the V-shaped cross section of the adhesive (3) is maintained. It remains as it was.

In particular, when the cylindrical body (1) in which the bottom plate (2) is press-fitted is maintained in an inverted state and the lumped aggregated portion of the adhesive (3) is extended in a V-shape as in this embodiment, the adhesive ( When 3) is maintained in a low viscosity condition, the V-shape of the aggregated portion of the adhesive (3) rapidly progresses, and the productivity is further improved.

If the adhesive (3) is not temporarily made to have a low viscosity as described above, it is possible to maintain the adhesive (3) in an inverted state until the adhesive (3) is dried and cured after completion of the curling process. In this case, the narrow mouth container after the completion of the crimping process may be stocked in an inverted state.

In the above embodiment, as the material forming the tubular body (1), a steel plate, an aluminum plated steel plate, a clad steel plate of an aluminum sheet and a thin steel plate, a composite steel plate having a synthetic resin coating on the inner surface, or the like can be adopted. Is.

Further, as the adhesive (3) for bonding the bottom plate (2) and the tubular body (1), a two-component epoxy adhesive (epoxy-amine type adhesive, epoxy-urethane type adhesive), etc. As described above, an adhesive having high viscosity is effective.

Next, when the viscosity of the adhesive (3) is temporarily reduced by heating, in the case of the epoxy-amine type adhesive,
150 ° C .: Heating for several seconds is sufficient, and in the curling process shown in FIGS. 4 and 5, it is rational to irradiate the processing area with an infrared heater or perform high frequency heating.

Further, the upper end of the skirt portion (21) of the bottom plate (2) has a tapered portion in the above-mentioned embodiment, but it has an arcuate portion (23) as shown in FIG. Even with this structure, the process of press-fitting the bottom plate (2) into the tubular body (1) becomes smooth. As described above, in addition to press-fitting the bottom plate (2), a so-called intermediate-fitting eyelet having a slight gap may be set.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a relationship between a cylindrical body (1) coated with an adhesive (3) and a bottom plate (2) in an embodiment of the second invention, and FIG. 2 is an explanation of a press-fitting completed state. Figure, Figure 3
FIG. 4 is an explanatory view of the curling process, FIG. 5 is an explanatory view of the adhesive (3) applying process, FIG. 6 is an explanatory view of another shape of the bottom plate (2), and FIGS. It is explanatory drawing of a prior art example, (1) ...... cylindrical body, (11) ...... bottom end open part (2) ...... bottom plate, (21) skirt part (22) …… end plate part, (3 )……adhesive

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-49-125917 (JP, A) JP-A-62-72443 (JP, A) JP-B 41-16277 (JP, B1) JP-B 48- 23317 (JP, B2) JP-B 62-20100 (JP, B2)

Claims (2)

[Claims] A bottom plate (2) having a skirt portion (21) is press-fitted or fitted into a lower end open portion (11) of a cylindrical body (1) formed in a bottom opened state to form a skirt portion (21). The bottom end opening (11) and the bottom plate (2) are bonded to each other with an adhesive (3) and the bottom end opening (11) is bent inward.
In a pressure container of a type in which the adhesive (3) is of a dry-curing type, the adhesive (3) includes a fitting portion between the tubular body (1) and the bottom plate (2), and Between the inner peripheral surface of the tubular body (1) in the vicinity of the fitting portion and the inner end edge of the skirt portion (21), there is continuously interposed in the range of, and the tubular body (1) The adhesive portion interposed between the inner peripheral surface and the inner edge of the skirt portion (21) extends from the portion along the end plate portion (22) of the bottom plate (2) to the inner peripheral surface of the tubular body (1). A pressure vessel formed in a substantially V-shaped cross section so as to face. 2. A skirt part (21) by press-fitting or fitting a bottom plate (2) having a skirt part (21) into a lower end open part (11) of a cylindrical body (1) formed in an open bottom part. The bottom end opening (11) and the bottom plate (2) are bonded to each other with an adhesive (3) and the bottom end opening (11) is bent inward.
In the method for manufacturing a pressure vessel of the type in which the adhesive (3) is of a dry hardening type, the tubular body (1)
A step of applying the adhesive (3) in an annular shape on the inner peripheral surface in the vicinity of the lower end opening (11), a step of press-fitting or fitting a bottom plate (2) through the lower end opening (11), and a bottom plate (2 ) Is inserted into the tubular body (1) so that the lower end opening portion (11) is bent inward, and the skirt portion (21) of the bottom plate (2) is caulked. And / or a method of manufacturing a pressure vessel in which the tubular body (1) is maintained in an inverted state for a certain period of time in a subsequent step.