WO1991015405A1

WO1991015405A1 - Three-part pack of metal or metal/plastic composite film

Info

Publication number: WO1991015405A1
Application number: PCT/EP1991/000606
Authority: WO
Inventors: Hans-Josef HÄRING
Original assignee: Schmalbach-Lubeca Ag
Priority date: 1990-04-03
Filing date: 1991-03-28
Publication date: 1991-10-17
Also published as: EP0474837B1; DE4010660A1; DE59105653D1; EP0474837A1; ES2075439T3; DE4010660C2; PT97223B; DK0474837T3; GR3017111T3; PT97223A; ATE123460T1

Abstract

The description relates to a three-part stackable pack or box (12) of metal, metal foil or metal/plastic composite film in which the body (3) and cover (7) or cover ring and the body and base (4) are secured together by a folded seam (5, 8). Both folded seams (5, 8) are shaped over a limited region of their axial height, especially by the formation of a shoulder (16), in such a way that, when stacked, they engage telescopically over this limited height.

Description

"Three-part packaging made of metal or metal / plastic composite film"

The invention relates to a three-part packaging made of metal or metal / plastic composite film, with the features of the preamble of claim 1.

It is known to design cans made of sheet metal or the like by making the bottom end or the lid end of the fuselage radially opposite the other end, so that the relevant areas can interlock when stacked.

In contrast, it is an object of the invention to enable the stackability of packaging or cans with the features of the preamble, without the need to radially retract the bottom end or the lid end of the fuselage to a considerable extent.

This object is achieved by the teaching of claim 1. With the new design of the packaging, the body, lid or ring, bottom and the double seams required to connect the parts remain essentially unchanged compared to conventional packaging of this type. It is only the cross-sectional outline of the bottom-side and lid-side seams that are changed so that when they are stacked, the seams telescope over part of their axial dimensions. In this way a good stackability is obtained without the hull having to be drawn in at its ends.

It is not critical what type of fold seam is, whether it is a single fold, a double fold or a multiple fold.

It is possible to provide both the bottom rebate and the cover-side rebate with such a radial gradation which enables intermeshing, the two gradations being matched to one another, so that a smooth but secure engagement is possible. It is not critical whether the shoulder-like enlargement is assigned to the bottom fold or the cover fold and the shoulder-like narrowing is assigned to the other fold. For production, however, it is expedient to assign the radial expansion of the inner diameter of the axially outer section of the fold seam to the cover-side fold.

The grading of the fold is expediently carried out during the manufacture of the fold by using appropriately profiled closing heads and / or closing roller profiles.

In the case of multiple folds, the shoulder is expediently located directly outside the overlap area of the lid hook and trunk hook. In order to avoid too large a shoulder on the closing head, which is necessary for the formation of the shoulder, for example for the lid, it is cheaper and more advantageous to first form the bottom fold in the usual cylindrical, smooth, shoulder-free shape and to fold in a subsequent step into a conical shape that tapers axially outwards and radially inwards. This makes it possible to emboss the shoulder in the lid-side fold less radially, so that it is possible to work with a closing head with a significantly reduced heel. , This facilitates the formation of the lid-side fold with shoulder-like expansion without impairing the high speeds of modern sealing machines and without impairing the strength and tightness and reliability of the seam connection.

In all embodiments there is the particular advantage that the manufacture and closing of the packaging can be based on lower parts or body parts and lids or cover rings as well as base parts which correspond exactly to the parts customary for this packaging in terms of their geometric shape and dimensions . In the second embodiment, the bottom seam seam can also be produced in the usual cylindrical direction and with the usual tools on the conventional machines. Additional funds are only required for the subsequent step that compresses the seam into the conical shape.

The invention is explained in more detail below with the aid of schematic drawings using several exemplary embodiments. Show it:

Figure 1 in detail and in vertical section two stacked packages according to the invention;

Figure 2 in a representation similar to Figure 1, the bottom fold of the upper package of Figure 1 before the final step, the fold compressing.

Figure 3 in a similar representation as Figure 1, the lid-side fold and the associated closing head with details and

FIG. 4 shows a modified exemplary embodiment in a similar representation to that of FIG. 1, but the tools required for the production are, if necessary, also shown in the engaged position.

The parts of the packaging can be made of the same or different materials. Metal sheet or metal foil or metal / plastic composite foil can be used for the production.

The invention is preferably applicable to three-part packagings in which a bottom part or a cover part or cover part is fastened in a sealing and permanent manner at the two ends of a body part by means of a seam. For this purpose, the fuselage and / or base and cover part have corresponding rim flanges.

The fold connections can be formed in any conventional manner, regardless of whether it is a single fold or a double fold seam or is a multiple fold.

In all embodiments, it is preferred to start with packaging parts which are conventional in terms of geometry and dimensions and which therefore do not require any special manufacturing measures or manufacturing steps. The references in the following description to the special design of the bottom-side and the lid-side seam can also be referred to the two folded seams in the reverse manner, without this being explicitly mentioned below. However, it can be assumed that the illustrated assignments of the features are preferred, the embodiment of FIGS. 1 to 3 again being preferred over the embodiment of FIG.

In the exemplary embodiment according to FIGS. 1 and 3, two packages 1 and 2 are treated in the cutout, which are stacked one on top of the other in FIG. It is assumed that packages 1 and 2 are of the same overall design, so that the instructions given for one package also apply equally to the other package.

The packaging consists of a cylindrical body 3 of any cross-section, which has an outwardly bent edge flange at its two ends from manufacture. The lower end is closed by a preformed bottom part 4, which in the example shown has an edge flange starting from the core wall. The flanges at the lower end of the fuselage 3 and the bottom 4 become firm, tight and permanent with a conventional closing tool, that is to say with the aid of a central closing head and outer locking rollers, into a fold seam, in the example shown into a double fold seam 5 connected. (O

As can be seen from FIG. 2, the double-fold seam 5 on the bottom side extends after its production essentially in axial alignment with the cylindrical body 3.

After completion of the bottom seam, this is subsequently transferred in a further step with the aid of a compression ring 10 from the orientation according to FIG. 2 to the conically compressed orientation according to FIG. 1. For this purpose, the compression ring 10 has a conical inner surface 11 which is inclined relative to the axis of the compression ring at an angle 12 which is between 5 ° and 15 °, preferably between 7 ° and 10 °. The compression ring is pressed in relation to the packaging in the direction of arrow 13, as a result of which the double seam 5 is drawn in radially in the direction of arrow 14. The transition between the conical seam area and the cylindrical body is indicated in FIG. 1 at 3c, 3a being the original cylindrical body wall and 3b being the lower conical part of the body wall. In this way, the bottom rebate is significantly reduced in its outer diameter and brought into a conical position.

The package 2 is closed at its upper end by a cover part 7, which has a flange adjacent to its core wall, which flange is deformed together with the edge flange of the body 6 into a fold seam, in the example shown a double fold seam. In the production of this double fold seam 8, a specially designed closing head 15 is used, as shown in FIG. 3. This closing head 15 engages in the lid placed on the fuselage end and has a ring shoulder 16 at a distance from the axially outer edge of the double fold seam, via which the closing head 15 is correspondingly expanded in its upper region. It can also be seen that the closing head 15 below the shoulder 16 and above the shoulder in each case has weakly tapered peripheral walls 17 and 19 respectively. The radial expansion of the shoulder 16 is indicated at 21. It is preferably in the range from 1 to 1.5 material thicknesses of the material layers lying in the fold seam. The angles of inclination of the peripheral sections 17 and 19 are shown at 18 and 20, respectively. They are expediently between 5 ° and 15 ° and preferably between about 7 ° and 10 °.

Correspondingly adapted closing rollers cooperate with the closing head 15, so that there is a double fold seam, as shown in FIGS. 1 and 3. This double fold seam is preferably shoulder-like in its inner diameter, preferably immediately above the area 26 over which the trunk hook and the cover hook overlap, the shoulder dimension corresponding approximately to the dimension 21 of the shoulder 16. This extension extends over the outer region 27 of the axial length 25 of the double fold seam 8. Over the length 27, when the same packages 1 and 2 are stacked on top of one another, the fold seams are telescopically engaged, the extent of the engagement being indicated by 9 in FIG.

It should also be noted that the compression of the bottom seam according to FIG. 2 and the enlargement of the inside diameter of the outer area of the cover-side seam according to FIG. 3 are coordinated with one another, so that the seams engage easily but with sufficiently little play. The intervention is additionally facilitated by the taper of both seams.

The design of the fold seam on the cover side according to FIG. 3 can advantageously also be used in two-part containers in which the bottom, which is integrally connected to the fuselage, is dimensioned and conical in accordance with the fold 5 on the bottom. t

In the embodiment according to FIG. 4, shoulder-like shoulders are provided in the bottom-side and in the lid-side fold. With the help of the closing head 36 and a special profile 34 of the associated closing rollers 33, the bottom seam seam between the fuselage 30 and bottom 31 is provided with a shoulder-like reduction in the outside diameter of the seam seam in the area above the overlap area 35 of the bottom hook and body hook, as is the case with the shaping shows the upper part of Figure 4. At the same time, the closing head 36 can have a slightly conical peripheral wall 37, so that the fold seam 32 is weakly conical overall.

On the cover side, the fuselage 40 is connected to the cover 41 via the fold seam 42, using a closing head 46 provided with a special profile 47, 48. In the upper region, the profile has a circumferential nose which projects radially to a considerable extent and which has a Shoulder 47 forms. In cooperation with corresponding sealing rollers, the area 43 of the double fold seam 42 above the overlap area 45 of the hook sections lying in the fold is enlarged shoulder-like with respect to the inside diameter.

Here, too, the shoulder-like deformations on the two fold seams are coordinated with one another in such a way that the outer areas can interlock easily but with little play.

In this embodiment, it should be noted that the relatively large circumferential nose of the closing head 46 causes a relatively high load on the folded parts, which can impair the controlled formation of folds at the high production or closing speeds.

Claims

3A claims

1. Three-part packaging made of metal or metal / plastic composite film, consisting of a lower part with an edge flange on both fuselage ends and a base, and a cover or a cover ring part with a flange, each of which has an essentially cylindrical simple shape after the lower part has been filled ¬ or multiple fold seams are permanently and sealingly connected to each other, characterized in that the bottom and cover fold seams (5,32,8,42) in a coordinated manner and each step over a limited axial height (27,43) are reduced or enlarged by a predetermined radial dimension such that the fold seams engage in one another when the packaging is stacked over the limited axial height (9).

2. Packaging according to claim 1, characterized in that the step-shaped enlargement of the bottom or top fold in each case essentially on the axial region (27, 43) of the multiple fold seam outside the overlap region (26, 35, 45) of the trunk. and lid hook is limited.

3. Packaging according to claim 1 or 2, characterized in that the depth (43) of the mutual engagement of the seams is approximately 1 to 1.5 mm.

4. Packaging according to one of claims 1 to 3, characterized gekennzeich¬ net that the radial dimension (21) of the step-like enlargement or Verklei- The maximum difference of the double fold seam corresponds approximately to the total thickness of material layers of the double fold seam (5.8; 32.42).

5. Packaging according to one of claims 1 to 3, characterized in that the radial dimension (21) of the step-like enlargement or reduction of the double fold seam corresponds approximately to a thickness of 1 to 1.5 material layers of the double fold seam (5, 8).

6. Packaging according to one of claims 1 to 5, characterized in that the step-like enlargement of the seam (8,42) is associated with the cover (7,41).

7. Packaging according to one of claims 1 to 5, characterized in that the step-like enlargement of the fold seam is assigned to the bottom.

8. Packaging according to claim 6, characterized g e k e n n z e i c h n e t that the Bodeπfalz is compressed or pressed from its original cylindrical orientation (see Fig. 2) without a step formation in an axially outward and radially inward inclined position (see Fig. 1).

9. Packaging according to claim 6 or 8, characterized in that the cover fold (8), which has a step-like enlargement, is formed in an axially and radially outwardly slightly conical position (cf. FIGS. 1 and 3).

10. Packaging according to claim 8 or 9, characterized in that the inclination of the fold relative to the packaging axis between 5 ° ΛA and 15 °, preferably between 7 ° and 10 °.

11. A method for producing a three-part packaging according to claim 1, in which a preformed lower part with an edge flange and a preformed bottom part or cover part or cover ring part with flange of conventional shape and dimension is assumed and after the filling of the lower part, the parts by forming a Single or multiple fold seams are tightly and permanently connected to one another, characterized in that a step of a predetermined radial dimension is formed at the predetermined distance from the axially outer fold seam edge when the bottom fold seam and the cover fold seam are formed, and in one of the two fold seams with an increase in the inside diameter and in the other fold seam with a decrease in the outside diameter in each case of the fold seam area lying axially outside the shoulder, such that these two fold seam areas tel when stacking several packages interlock like a telescope.

12. A method for producing a three-part packaging according to claim 1 and 7, in which a preformed lower part with an edge flange and a preformed bottom part or cover part or cover ring part with flange of conventional shape and dimension is assumed and after filling the lower part, these parts Formation of a single or multiple fold seam are tightly and permanently connected to one another, characterized in that when the cover fold seam is formed at a predetermined distance from the axially outer fold seam edge, a step of a predetermined radial dimension is formed while increasing the inner diameter of the fold seam region lying axially outside the shoulder and after shaping the bottom seam in the conventional In terms of shape, alignment and dimensioning, the bottom seam is compressed from its essentially cylindrical orientation into an alignment position in which its diameter decreases conically in the direction of the axially outer seam edge, such that the bottom seam seam telescopically into the when stacking several packages Lid seam of an underlying packaging can intervene.

13. Packaging according to claim 12, characterized in that the lid seam is simultaneously broke into an axially and radially outwardly widening shape during the graded shaping.