JPH0356520Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the structure of can lids and can bottoms for two-piece cans and three-piece cans that are stacked in multiple stages and subjected to retort processing.

(Prior art) In the case of conventional two-piece cans and three-piece cans, multiple can bodies are stacked in multiple tiers and heated to temperatures of 120° to 140°C.
When retort sterilization is performed at a temperature of , the bottom of the upper can and the lid of the lower can come into close contact with each other during the cooling process after sterilization, causing docking. That is, to explain this docking phenomenon for deep-drawn cans (two-piece cans) as shown in FIGS. 5 to 7, FIG. 5 shows the state before retort, and in the same figure,
1 is a can body container, and this can body container 100 is provided with a panel portion 101 forming a can bottom at the bottom and a panel portion 103 forming a can lid 102 at the top. The bottom panel portion 101 has a bottom radius 101a on its outer peripheral edge, and a concentric bottom bead 101b on the inner peripheral side of the bottom radius 101a. On the other hand, concentric lid beads 103a are also formed on the panel portion 103 of the can lid, and the beads 101b and 103a correspond to each other in the vertical direction. In addition, in the state before the retort shown in FIG. 5, the bottom bead 101b and the lid bead 103 are
It is in a state of non-contact with a.

Next, as the internal pressure increases in the retort, both the bottom side panel section 101 and the lid panel section 103 expand and return to their original state after cooling.
That is, when the cans 100 are stacked in multiple stages, as shown in FIG. 6, the cans 100 located relatively lower receive a stronger axial load as shown by the arrow, When retort processing is performed under these conditions, the bottom panel portion 101 and the lid panel portion 103 are brought into close contact with each other due to internal pressure expansion, and the bottom bead 101b and the lid bead 103a are also brought into close contact. Next, when the can body container 100 is cooled after the retort treatment, the panel portion 100 remains in close contact with the lid bead 103a, as shown in FIG.
1 and 103 are restored in the direction of the arrow, and during this time a vacuum section 105 is generated and docking of the cans 100 and 100 occurs. This also applies to three-piece cans.

(Problem to be solved by the invention) In this way, in the conventional example described above, the bottom bead and the lid bead come into close contact with each other due to internal pressure expansion during retorting, so a vacuum section is formed during cooling after retorting, and the can body There was a problem that containers would dock with each other.

Therefore, the present invention was devised to solve the above-mentioned problems of the conventional example, and its purpose is to reliably prevent the docking phenomenon by improving the shape of the bead part of the bottom or lid. Therefore, the object is to significantly improve the handling properties of the can body and container.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a bottom panel portion that constitutes the bottom of the container body in cans that are stacked in multiple stages and subjected to retort processing. A raised bottom part is provided in the lid panel part that constitutes the upper part of the container body, and a recessed part is provided at a position corresponding to the raised bottom part, and an annular bottom bead that protrudes downward is provided on the outer circumferential side of the raised bottom part. , an annular lid bead having substantially the same radius as the bottom bead and concentric with the bottom bead is formed on the outer circumferential side of the recess, and a plurality of container bodies are formed on the bottom bead or the lid bead. A forming means is provided for forming an air communication part that communicates the space formed between the raised bottom part of the upper container body and the recessed part of the lower container body with the outside when the containers are stacked. There is.

(Embodiment) The present invention will be explained below based on the illustrated embodiment. FIGS. 1A and 1B show a case where a 2-pis can such as a deep-drawn can is taken as an example; 1 is a container body, and this container body 1 has a bottom panel portion 2 at the bottom and a lid panel portion 3 at the top. A central portion of the bottom panel portion 2 protrudes inwardly into the container body 1 in a dome shape to form a raised bottom portion 10. An annular bottom radius 2a is provided on the outer peripheral edge of the bottom panel portion 2, and an annular bottom bead 2b concentric with the bottom radius 2a is provided on the outer peripheral side of the raised bottom portion 10.
is formed to protrude downward. On the other hand, a recessed part 11 having a shape corresponding to the raised bottom part 10 is provided in the center of the lid panel part 3. This hollow part 11
An annular bottom bead 3a that is concentric with the bottom bead 2b is formed on the outer peripheral side of the bottom bead 2b. In this way, the rigidity of the bottom panel portion 2 and the lid panel 3 is increased. Then, the bottom bead 2 of the upper container body 1
b and the lid bead 3a of the lower container main body 1 have substantially the same radius and are in a corresponding relationship in the vertical direction. Further, in this embodiment, an arbitrary number of dimple-like protrusions 4 are provided on the bottom surface of the annular bottom bead 2b at predetermined intervals in the circumferential direction.
When a plurality of container bodies 1, .

Furthermore, FIGS. 2A and 2B show a second embodiment of the can body container according to the present invention, and in this embodiment, a recess is formed at a predetermined interval on the bottom surface of the bottom bead 2b to form an air communication section S. An arbitrary number of grooves 5 are provided.
Furthermore, FIG. 3 shows a third embodiment of the can body container according to the present invention, and in this embodiment, there are three or four protrusions 6 at predetermined intervals around the entire circumference of the lid bead 3a.
are integrally formed. And Figure 4 is
A fourth embodiment of the can body container according to the present invention is shown, and in this embodiment, a groove 7 similar to the second embodiment is formed in the lid bead 3a.

On the other hand, in three-piece cans such as welded cans, the third
As in the embodiment shown in FIG. 4, a dimple-like projection or groove may be formed integrally with the bead on the bottom cover or the top cover.

Here, it is preferable that the projections 4 and 6 have a height of about 0.3 mm and are formed at three or four locations. This is because molding with a thickness of 0.5 mm or more may cause the protrusion to break, so for safety reasons, a protrusion of approximately 0.3 mm is preferable. In addition, in order to support an annular bead with good stability, it is sufficient to provide a minimum of three protrusions and create a three-point support configuration.If more protrusions are provided, the undulations This is because there is a possibility that problems (sinking and swelling near the processed portion) may occur. On the other hand, the grooves 5 and 7 have a depth
It is about 0.5mm, and like protrusions 4 and 6, 3 and 4
It is desirable that the area be formed in places.

This is because if the groove becomes shallower than 0.5 mm, it will be sealed by the attached water and no air communication portion can be formed.

Thus, when a plurality of container bodies 1 as described above are stacked, the raised bottom part 10 of the upper container body 1
An inner space A is formed between the inner space A and the recessed part 11 of the lower container body 1, and an air communication part S formed by the projections 4, 6 or the grooves 5, 7 allows the inner space A and the outside are in communication.

Next, when the stacked container bodies 1 are subjected to retort processing, the internal pressure of the container bodies 1 rises and the bottom 1
0 and the recessed portion 11 are elastically deformed, that is, expanded, in a direction toward each other, and come into close contact with each other. Then, when the internal pressure of the container body 1 decreases in the cooling process after sterilization, the raised bottom part 10 and the recessed part 11 return to their pre-deformed shapes.

When the raised bottom part 10 and the recessed part 11 return, the inner space A is communicated with the outside via the air communication passage S, so that the inner space A is prevented from becoming a vacuum state, and the container body 1 Docking between the two can be prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be applied even if the beads have other shapes, such as rectangular shapes.

(Effect of the invention) The can body container according to the invention has the above-mentioned structure and function, and when a plurality of container bodies are stacked, the bottom panel part of the upper container body and the lid panel part of the lower container body are separated. The inner space formed between the two is in communication with the outside via the air communication section. Therefore, even if the container body is cooled after being retorted, the inner space will not be in a vacuum state, and it is possible to reliably prevent docking of the can bodies and containers, thereby significantly improving handling properties. Moreover, it has the effect of completely eliminating deformation of the panel.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the can body container according to the present invention, FIG. 1A is a partially enlarged sectional view, FIG. B is a perspective view of the main part, and FIG. FIG. 3 is a partially enlarged sectional view showing a third embodiment of the can body container according to the present invention, FIG. Fig. 4 is a partially enlarged sectional view showing a fourth embodiment of the can body container according to the present invention, Figs. 5 to 7 show conventional examples of the can body container, and Fig. 5 is a portion showing the state before retorting. FIG. 6 is a partially enlarged sectional view showing the state during retorting, and FIG. 7 is a partially enlarged sectional view showing the cooling state after retorting. Explanation of symbols: 1...Container body, 2...Bottom panel section, 2a...Bottom radius, 2b...Bottom bead, 3...Lid panel section, 3a...Lid bead, 4, 6...Protrusion (air communication) part forming means), 5,
7... Concave groove (air communication portion forming means).

Claims (1)

[Scope of Claim for Utility Model Registration] In a can body container that is stacked in multiple tiers and subjected to retort processing, a bottom panel portion forming the bottom of the container body is provided with a raised bottom portion, and a lid panel portion forming the upper portion of the container body is provided with a raised bottom portion. A recessed portion is provided at a position corresponding to the raised bottom portion, and an annular bottom bead protruding downward is provided on the outer peripheral side of the raised bottom portion, and the outer peripheral side of the recessed portion has approximately the same radius as the bottom bead. and an annular lid bead concentric with the bottom bead is formed to protrude upward, and the bottom bead or the lid bead is provided with:
Forming means for forming an air communication portion that communicates the outside with the inner space formed between the raised bottom of the upper container body and the recessed portion of the lower container body when a plurality of container bodies are stacked. A can body container characterized by being provided with.