EP0868355B1 - Tin for foodstuffs - Google Patents

Abstract

The invention concerns a tin for foodstuffs, the tin comprising a base (10) and a peripheral wall (20) which projects from the base and surrounds an inner space (30). The upper edge of the wall delimits all around an opening (31) in the inner space (30), the inner space (30) widening conically upwards and the wall (20), which surrounds this inner space, merging at the bottom into the base (10) at a rounded portion (21). The merging region is designed such that a peripheral annular bearing line (11) is produced but, on the interior, the base is first further extended upwards and then a bearing surface (16) between 1.5 and 10 mm wide is produced by a downwardly projecting peripheral annular bead (15).

Description

The invention relates to a can body with a bottom and one from this towering, surrounding side wall surrounding an interior.

Can bodies are known in many forms. Very different They pack food and the demands placed on them in terms of aesthetic appearance, durability, stability and stackability switch.

From DE-GM 19 98 472, for example, a tin made of tin is known is circular in cross section, the side walls of which expand upwards and which has a bottom that on the bottom by means of an annular actuator Floor stands while the central area of the floor is curved upwards is not touching the floor when parking. The side walls are curved.

Because the floor is not completely flat, the stability of the can body becomes increased, because completely flat floors could warp and In the case of production-related irregularities, this also leads to the can body is not defined on the floor, but for example only punctiform on a more or less randomly lowest point on the ground rests unstably and the entire can therefore tends to wobble.

The control element, that is the round peripheral edge, on which the can body is now rests on the floor in this known embodiment a finite width; it merges slightly into the side wall.

It would be desirable if the can body was even more stable against would be external requirements. The object of the invention is therefore such To propose a can body.

The invention solves this problem with a can body with Floor and one that surrounds an interior and surrounds it Side wall, which with its upper edge an opening of the interior limited all around, the interior expanding conically upwards and the side wall surrounding it in a curve in the bottom passes over that a circumferential ring-shaped support line is created, the floor is initially extended further upwards, but then through a downwardly projecting circumferential annular bead a support surface with a width of 1.5 mm, in particular from 2 to 10 mm.

Such a can body has a significant number of advantages: Outside, its contact surface is given by an annular line when it is parked. Further inside there is an additional contact surface with a defined one Width, which is approximately parallel, also ring-shaped, to the support line extends. The combination of these two support areas comes into play Tests as extremely stability-enhancing. It arises in the transferred A kind of three-point bearing, namely by a flat and a line-shaped support, ie a section and a point on average.

This contact surface is not only against forces from the side, from below or also particularly stable from the can body itself, it is also immune against manufacturing tolerances and resists from inside the can body originating tensile and bending forces. These powers cannot only arise from the filling of the tin, but also when a series of empty can bodies are put together.

This is also possible due to the overall shape: The flared side walls allow that empty cans after they are made and before they are filled in the food processing operation can be nested in a space-saving manner. Naturally this leads to forces that the empty tin can bodies exert on one another. It is precisely these forces that are created by this special training intercepted the ground.

It is particularly preferred for this if the upper edge is around the opening around has an edge profile with three alternate curvatures that form a shoulder or a step edge.

The stacked, slightly conical containers now support each other each with the step edge from each other, so that the conical side walls otherwise not or hardly come into contact with each other and jamming is impossible.

This makes stacking and unstacking several containers much easier, at the same time increases in cooperation with the combination of the support line and contact surface in the floor the overall stability and definability the stacking properties.

It is particularly preferred if the can body is made of metal. Theoretically, it is also conceivable to place these shapes on plastic containers expand, in the case of metallic bodies, the inventive ones have been tested However, features proved to be particularly advantageous.

It is further preferred if the rounding has a radius of curvature of more than 4 mm. The curve where the side walls merge with the floor are authoritative for the extent of the line shape of the support line, too for the behavior of the can body when it is out of its rest position is brought out, for example in a filled form on the shelf of a supermarket. Due to the relatively large curvature with a large radius of curvature the self-adjustment of the can body in filled form is special cheap to do. The visual and aesthetic appearance of greater advantage; it creates a crowned, soup-pot-like shape that is special is attractive.

It is preferred if the opening is circular. Of course it is too possible, oval, roughly rectangular, or completely different shapes Provide openings, the shape of which then of course extends into the floor area affects it.

The distance between the support line and the support surface should advantageously be between 7 and 30 mm. With these dimensions comes the even distribution of the forces acting on the ground is particularly good to advantage.

The diameter of the annular contact surface should be approximately 20 to 80 mm. This also reinforces the inventive effect.

The stacking and unstacking of non-round cans in particular further improved if the side wall is provided with corrugations. By these corrugations the circumferential side wall is so stiff that a compression of the Sidewall does not enter. This also keeps the can body Strain its shape. Such a burden can be particularly during Filling the can containers occur, especially when flaring the lid after filling. Especially during this stage of the process Dimensional stability of the body is important to good material overlay of lid and container to each other to ensure the To allow flaring, in which yes the materials of the can body and associated lid are folded into each other.

The ability to stack and unstack is also important because the tin can bodies are still empty placed inside each other as possible to save space must be able to be and then, if possible, by machines must be able to be taken apart so that not at Lift off the top can body, the next one follows. this will also supported by the ripples. This is especially true when the ripples run essentially vertically.

This is further supported if the corrugations from the area of the one of the shoulders extends over a substantial part of the side wall extend below.

In this way, the corrugations not only have the task of stiffening the Side wall, but also the leadership of the various can bodies into each other, especially during the stacking or unstacking process. Because the corrugations run upwards, this is a light, even one Can be removed.

Figur 1

einen Querschnitt durch einen erfindungsgemäßen Konservendosenkörper;

Figur 2

eine perspektivische Draufsicht auf den Konservendosenkörper aus Figur 1;

Figur 3

den Konservendosenkörper aus Figur 2, teilweise weggeschnitten und mit in ähnlicher Form dargestelltem, noch nicht fest aufgesetztem Deckel;

Figur 4

eine andere Ausführungsform eines Konservendosenkörpers schräg von oben gesehen;

Figur 5

die Ausführungsform aus Figur 4 schräg von der Seite mit zwei alternativen Möglichkeiten für eine Gestaltung des Deckels; und

Figur 6

eine dritte Ausführungsform eines erfindungsgemäßen Konservendosenkörpers.

In the following an embodiment of the invention will be described with reference to the drawing. Show it:

Figure 1

a cross section through a can body according to the invention;

Figure 2

a top perspective view of the can body of Figure 1;

Figure 3

the can body from Figure 2, partially cut away and with a similar shape, not yet firmly attached lid;

Figure 4

another embodiment of a can body seen obliquely from above;

Figure 5

the embodiment of Figure 4 obliquely from the side with two alternative options for a design of the lid; and

Figure 6

a third embodiment of a can body according to the invention.

A can body has a bottom 10. From this bottom 10 protrudes a side wall 20. The side wall 20 surrounds an interior space 30 Interior 30 is the to be transported with the tin and in their goods to be stored, in particular foodstuffs.

The upper edge of the side wall 20 surrounds an opening 31 of the interior 30 all around; this opening can (indicated in Figures 3 and 5) be closed by a cover 40 and this is usually after Filling with the contents too.

The interior 30 widens conically upwards. This means that from the circumferential side wall 20 projecting from the floor diverges upwards. At the bottom, the side wall 20 merges into the floor 10 in a curve 21. This is done in such a way that the curve 21 is a circumferential annular support line 11 forms. The curve itself has a radius of curvature of e.g. 4.5 mm or 8 mm for can bodies of typical sizes.

Viewed from the outside in cross section, this support line 11 appears in Figure 1 as a point. Continue to the center of the can body bottom 10 seen the floor 10 extends inwards from the support line 11 however, initially upwards, so it leaves the support level.

After this relatively short, curved and in about 7 to 30 mm However, bulge 32 directed towards the interior 30 then jumps down again a circumferential annular bead 15 in front. This bead 15 but now does not form a support line, but a support surface 16 with a Width from 1.5 to 10 mm. This bearing surface is shown in the section in FIG. 1 as a stretch with a length of 1.5 to 10 mm.

From this bead continue towards the center of the can body bottom 10 then the floor leaves the support level again and jumps a little back towards the interior 30.

This is repeated symmetrically on the other side of FIG. 1; at a altogether, a canned body having a circular opening 31 this cut is approximately the same at every point on the tin.

In the perspective view in FIG. 2, the bead 15 can also be seen obliquely from the top inwards; from the interior 30 it shows itself as a projection downwards with no shading whatsoever due to its flat, flat design. Also flat and without shading is the central area of the bottom 10, which, in contrast to the bead 15, does not lie on the bottom when the can body is turned off.

The opening 31 of the interior 30 is, as stated, from the upper edge the side wall 20 surrounded. This is alternating as an edge profile with three inward or outward curved curvatures that provide a shoulder 22 or form a step edge. Two containers protrude one above the other with their conically shaped side walls 20 into each other, the side walls run parallel to each other at a slight distance from each other would. The schools 22 then rest on one another. This stacking behavior will supported by the bead 15, which the stability and thus the centricity behavior the container favors.

FIG. 3 shows the embodiment from FIG. 2 less steeply, and the right quarter of the can body facing the viewer is cut away. A cut edge can thus be seen, which corresponds to that in the right field of FIG. 1, but at the same time also illustrates the curves and proportions resulting in three dimensions.

The cover 40 is shown (not cut away) at a distance above the opening 31.

Another embodiment of a can body shows the figures 4 and 5. Here, the opening 31 is not circular but rather rectangular with rounded corners, i.e. roughly oval. As a result, the ring-shaped Bead 15 and the annular support line 11 each also straight-line passages.

Here, too, the side wall or side walls 20 are slightly conical upwards trained apart.

Two different shapes of possible covers 40 are here one above the other for comparison purposes indicated above the opening 31.

A third embodiment of the invention is shown in FIG. 6 . This embodiment is also a spherical box and has a non-round, slightly conical shape similar to the embodiment of FIGS. 4 and 5, here additionally a step edge 22 with side corrugations 25. For the sake of clarity, some reference numerals have been omitted here, which correspond to those of the other figures.

The container or can body has a relatively large radius at the transition from the side wall to the floor 10.

It is a form-fitting packaging alternative especially with "Easy-opening" lid, i.e. an easy-to-open lid, for example with pull tab. It has a step edge 22 for high stability and Good stackability and unstackability of one and several other can bodies in the interior 30. Rigidity at the bottom 10 is due to a Support surface achieved with stabilizing bead.

The circumferential side wall 20 is so stiff that the side wall deflects 20 does not occur. This keeps the body in shape and enables a good material overlay between the lid 40 and the container, so that a secure flanging of the lid 40 can take place.

On a first circulating or locally interrupted in the area of the opening 31 located shoulder of the lower can body can the body to be stacked. This creates a distance between the flanged edges both bodies that allow the containers to be stacked one below the other. By a second, first outward in a circular arc and then in an arc inward over the first shoulder, especially in the area the curved side walls or only on the long sides Shoulder in connection with essentially vertical Side corrugations 25, which are round, oval, triangular, trapezoidal or polygonal Contour are executed, increases the rigidity of the side walls 20. The Figure 6 shows here only a version with a shoulder and simply trained Ripples 25.

The corrugations 25 run upwards in the area of the step edge 22, that is, on Height of the second shoulder, between the first and second shoulder or in the first shoulder. The leadership of the side ridges 25 in connection with the Shoulder causes an extremely good wall rigidity, so that the on the side wall 20 transmitted force of the crimping tools during crimping not to theirs Deformation leads and on the other hand in the case of stacked can bodies, which are filled and sealed, even when filling the Side walls 20 the required rigidity against buckling or buckling gives.

Claims (11)

1. Can body with a base (10) and a side wall (20) running round it which projects from the base and surrounds an interior (30) and which with its upper edge delimits an opening (31) of the interior all round, wherein the interior (30) widens conically upwards and the side wall (20) surrounding it merges at the bottom into the base (10) with a rounding (21) in such a way that an annular supporting line (11) running round the base is produced, but inwardly the base is initially further extended upwards but then due to an annular bead (15) running round which projects downwards a supporting surface (16) with a width of 1.5 to 10 mm is produced.
2. Can body as claimed in Claim 1, characterised in that it is made from metal.
3. Can body as claimed in Claim 1 or 2, characterised in that the rounding (21) has a radius of curvature of more than 4 mm.
4. Can body as claimed in one of the preceding claims, characterised in that the opening (31) is circular.
5. Can body as claimed in one of the preceding claims, characterised in that the opening (31) is non-round, long oval, elliptical or quadrangular.
6. Can body as claimed in one of the preceding claims, characterised in that the distance between the supporting line (11) and the supporting surface (16) is between 7 and 30 mm.
7. Can body as claimed in one of the preceding claims, characterised in that the diameter of the annular supporting surface (16) is between 20 and 80 mm.
8. Can body as claimed in one of the preceding claims, characterised in that the upper edge around the opening (31) has a rim profile with in particular three or more alternating curvatures which form one or more shoulders (22) or a stepped rim.
9. Can body as claimed in one of the preceding claims, characterised in that the side wall (20) is provided with corrugations (25).
10. Can body as claimed in Claim 9, characterised in that the corrugations (25) extend substantially vertically.
11. Can body as claimed in Claim 9 or 10, characterised in that the corrugations (25) extend downwards from the region of the shoulder or one of the shoulders (22) over a substantial part of the side wall (20).

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