JPH0221382Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the joint portion of a metal container such as a metal bottle, which is comprised of a two-part body in which a container body and an upper body are joined.

Conventionally, in a container consisting of a container body that has an opening on one side of the body and a bottom on the other side, and an upper body that has a peripheral wall that adheres to the opening, the opening of the container body is connected to the upper body. A metal container in which the upper body part is fitted onto the inner surface of the opening of the container, or a metal container in which the upper body part is fitted into the inner surface of the opening of the container body and the upper body part is fitted into the inner surface. Generally known.

In metal containers in which the upper body part is fitted externally or internally, the opening or the edge of the peripheral wall where the upper body is fitted is exposed to the contents filled in the container, so they gradually corrode. It has the disadvantage that the container material dissolves and the contents deteriorate. In order to solve this problem, as shown in FIGS. 1 and 2, the peripheral edge of the peripheral wall of the upper body part is folded back toward the outer surface of the peripheral wall to provide a folded part, and this folded part is connected to the opening of the container body. A container in which the upper body part is fitted into the inner surface so that the incisal end of the peripheral wall does not appear inside the container was published in JP-A-58.
-216542. However, in this container, the adhesive portion between the upper body part 21 and the container body 22 is only the space 24 where the adhesive 23 is applied and the area around the cut end 26 of the opening 25 of the container body 22; Since the outer surface 28a of the folded portion 28 of the peripheral wall portion 27 and the inner surface 25a of the opening 25 are only in surface contact, the adhesive strength is small and cannot withstand impact such as dropping, resulting in a decrease in strength. The disadvantage is that the adhesive part easily peels off. Further, if there is a gap in the overlapping portion when the circumferential wall portion 27 of the upper body portion 21 is folded back and overlapped with the outer surface of the circumferential wall portion 27 to provide the folded portion 28, the circumferential wall portion 27 of the upper body portion 21 may be When it is fitted into the inner surface 25a of the portion 25, the opening 25 simply touches the outer surface 28a of the folded portion 28, and the adhesive strength around the cut end 26 is extremely reduced, making it difficult to withstand impact such as dropping. Since the adhesive part is unavoidably easily damaged, it is necessary to overlap the folded part 28 on the outer surface of the peripheral wall part 27 by rapidly folding it back, as shown in the second figure, and to form the peripheral wall part 27 so as to form a certain space 24. Not only is it difficult to mold the peripheral part of the
Due to the sudden folding, cracks are likely to occur in the curved part 29 of the folded part 28, and the cracks cause the protective coating applied to the inner surface of the container to separate, causing the exposed metal surface to further damage the inner surface of the opening 25. 25a and folded part 2
8 and the outer surface 28a, the surface scratches and edge edges of the inner surface 25a and the outer surface 28a are exposed to the contents filled in the container, so that the container gradually corrodes and dissolves. However, it has the disadvantage that the contents change in quality. Furthermore, the inner surface 25a of the opening 25
When trying to prevent the contents inside the container from seeping between the outer surface 28a of the folded part 28 and the outer surface 28a of the folded part 28,
This method has drawbacks such as the need to apply adhesive to the contact point 30 between the inner surface 25a of the body 25 and the curved portion 29 separately from the work for bonding the upper body part 21 and the container body 22.

In addition, in the case of a metal container formed by fitting the upper body into the opening of the container, the filling inside the container may be beer, beer, etc.
For sparkling beverages such as carbonated beverages whose internal pressure is increased by gas, the internal pressure applies force to the opening of the container in the direction of separating it from the upper body part fitted therein. As a result, the adhesive part becomes easily peeled off, reducing the bonding strength between the container body and the upper body part.Furthermore, when the inner surface 25a of the opening 25 and the outer surface 28a of the folded part 28 are fitted together, There is no adhesive on the inner surface 25a and the outer surface 28.
Since the dimension of the outer surface 28a is made tight so as not to create a gap between the inner surface 25a and the outer surface 28a, not only the workability of fitting is poor, but also the inner surface 25a and the outer surface 28a scratch each other. ing. The present invention solves these drawbacks, and improves the joint strength of the joint part of a container such as a metal bottle, which is composed of a two-part body in which the container body and the upper body part are joined, and allows the liquid contained in the container to be The object of this invention is to provide a metal container with a structure that can reliably protect the incisal end exposed in the container body, which may be exposed to Part 3
A metal container comprising a container body 1 having a bottom portion 4 on the other side, and an upper body portion 5 having a peripheral wall portion 6 externally fitted and joined to the opening portion 3.
The circumferential edge portion of is folded back toward the outer surface 7 of the trunk and overlapped with the outer surface 7 of the trunk to form a folded part 8, and the outer surface 9 of the folded part 8 is formed by bending the trunk 2 at the cut end side of the folded part 8. The circumferential wall portion of the upper body portion 5 is arranged on the same plane as the outer surface 7 of the torso through the stepped portion, and is applied all around from the outer surface 9 of the folded portion 8 to the outer surface 7 of the torso. It is characterized by having the inner surfaces of 6 joined together.

Embodiments of the present invention will be described below with reference to the drawings.
The metal containers of the embodiments shown in FIGS. 3 to 5 are as follows:
It consists of a container body 1 and an upper body part 5, and the container body 1 has one of the body parts 2 with a peripheral part of the opening 3 folded back toward the body outer surface 7 side and overlapped with the body outer surface 7. A folded part 8 is formed, and the outer surface 9 of this folded part 8 is configured to be on the same plane as the outer surface 7 of the trunk by a stepped part formed by bending the trunk 2 on the incisal side of the folded part 8, and the other The upper body part 5 has a bottom part 4 integrally formed with the body part 2 by drawing process, and the upper body part 5 has a peripheral wall part 6 which is fitted and joined to the opening part 3 of the container body 1, and the upper surface has a cap, It is provided with a spout 11 having a smaller diameter than the peripheral wall portion 6 which can be sealed with a stopper or the like.

The container body 1 and the upper body part 5 are made of a metal material such as a tin-plated steel plate or an aluminum plate, and a protective coating 12, 13 such as an epoxy paint is applied to the entire inner surface of each container body 1 and the upper body part 5. ing.

The container body 1 and the upper body portion 5 are joined by an adhesive 10 applied all around from the outer surface 9 of the folded portion 8 of the container body 1 to the outer surface 7 of the body. As the adhesive 10, for example, a polyamide adhesive, a polyester adhesive, an ionomer adhesive, etc. are used for bonding by thermal welding, and these adhesives 10 can be applied in any form such as a film, powder, or solution.

As mentioned above, the metal container of the present invention has a container body 1.
Since the outer surface 9 of the folded part 8 is arranged on the same plane as the outer surface 7 of the torso, these surfaces 7 and 9 and the inner surface of the peripheral wall 6 of the upper body 5 are mutually flat surfaces. By applying the adhesive 10, not only the outer surface 9 of the folded portion 8 but also the outer surface 7 of the body are surface-joined to the inner surface of the peripheral wall portion 6. Because there is no force applied to the opening 3 of the container body 1, especially the peripheral wall 6 of the upper body 5 fitted on the outer surface 7 of the body, against the internal pressure of The container body 1 and the upper body part 5 will not separate even if subjected to such impact.

Further, when the peripheral edge portion of the opening 3 of the container body 1 is folded back toward the body outer surface 7 side to form the folded portion 8, the outer surface 9 of the folded portion 8 and the body outer surface 7 may be formed on the same plane. Therefore, even if there is a gap 14 at the overlapping part of the folded part 8 and the outer surface 7 of the body as shown in FIGS. 4 and 5, the opening 3 of the container body 1, especially the outer surface 7 of the body
Since the peripheral wall portion 6 of the upper body portion 5 and the peripheral wall portion 6 of the upper body portion 5 are jointed in a plane, there is no effect on the joint between the two. Therefore, unlike the conventional example, there is no need for a sudden folding process, and the process of forming the folded part 8 in the opening 3 can be easily performed, so that no cracks occur in the curved part 15 of the folded part 8, and the protective coating can be protected. Since 12 does not peel off, the metal material of the container is not exposed to the contents, so corrosion and dissolution do not occur, and deterioration of the contents is completely prevented.

Since the adhesive 10 can be applied on the same surface from the outer surface 9 of the folded part 8 to the outer surface 7 of the body, a predetermined amount can be easily and reliably applied to the predetermined positions to be bonded. Since the folded part 8 having a diameter of 15 is formed, the opening 3 of the container body 1 is connected to the peripheral wall part 6 of the upper body part 5.
When bonding to the inner surface of the opening 3, the curved portion 15 acts as a guide to facilitate insertion and bonding of the opening 3, making the bonding process simple and highly productive.

Further, when forming the folded part 8 at the opening 3 of the container body 1, there is no need for rapid folding, so even if a bulge 16 is formed in the curved part 15 of the folded part 8 during the folding process as shown in FIG. , outer surface 9 of folded portion 8
Since the adhesive 10 is applied from the top to the outer surface 7 of the body, and since the container body 1 and the upper body part 5 are jointed surface-wise, there is no effect on the joint between the two. The illustrated container body 1 has a bottom part 4 formed integrally with the body part 2 on the other side of the body part. It may be integrated into the bottom periphery, or it may be integrated into the upper body part 5.
Although the spout 11 is provided on the top surface, a pull-on type sealing lid may be attached to the upper edge of the peripheral portion 6.

As described above, in the metal container of the present invention, the peripheral edge portion of the opening 3 of the container body 1 is folded back toward the body outer surface 7 and overlapped with the body outer surface 7 to form the folded portion 8.
The outer surface 9 of the folded portion 8 is disposed on the same plane as the outer surface 7 of the trunk by a stepped portion formed by bending the trunk 2 on the cut end side of the folded portion 8.
Adhesive 1 applied all around the body from the outer surface 7
Since the inner surface of the peripheral wall part 6 of the upper body part 5 is joined by the inner surface of the peripheral wall part 6 of the upper body part 5, the upper body part 5 fitted into the opening part 3 of the container body 1 is protected against impact such as dropping and the internal pressure of the sparkling beverage.
Since no force is applied that would cause the container to separate from the peripheral wall 6 of the container, excellent strength is obtained at the joint, which prevents the joint from peeling off and prevents the cut end of the opening 3 from being folded back outward and appearing inside the container. Since there is no cutting edge, corrosion of the cut edge and dissolution of the container do not occur, and deterioration of the contents inside the container can be prevented. Further, since there is no need for rapid folding, the folded portion 8 can be easily formed into the opening 3, and no cracks will occur in the curved portion 15. Adhesive 1
0 can be easily applied because it can be applied on the same surface from the outer surface 9 of the folded part 8 to the outer surface 7 of the body, and the joining process between the container body 1 and the upper body part 5 is also facilitated with the curved part 15 serving as a guide. This has the effect of increasing productivity because it can be carried out at any time.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of the conventional example, Fig. 2 is an enlarged view of part B thereof, Fig. 3 is a cutaway side view of an example of the implementation of the present invention, Fig. 4 is an enlarged view of part A thereof, Fifth
The figure is an enlarged view of the part A in FIG. 3 of another example. 1... Container body, 2... Body, 3... Opening, 4
... Bottom part, 5 ... Upper body part, 6 ... Peripheral wall part, 7 ...
Body outer surface, 8... Turned part, 9... Outer surface, 10...
glue.

Claims (1)

[Scope of utility model registration request] An opening 3 is provided on one side of the body 2 and a bottom 4 is provided on the other side.
In a metal container consisting of a container body 1 having a container body 1 and an upper body part 5 having a peripheral wall part 6 which is fitted and joined to the opening part 3, the peripheral part of the opening part 3 is folded back toward the outer surface 7 side of the body part. A folded part 8 is formed by overlapping the outer surface 7 of the trunk, and the outer surface 9 of the folded part 8 is made flush with the outer surface 7 of the trunk by a stepped part formed by bending the trunk 2 on the cut end side of the folded part 8. The inner surface of the peripheral wall part 6 of the upper body part 5 is bonded to the inner surface of the peripheral wall part 6 of the upper body part 5 by an adhesive 10 disposed on the upper part of the body and applied all around from the outer surface 9 of the folded part 8 to the outer surface 7 of the torso part. container.