EP0882649B1 - Method of connecting a packaging container body with a cover member - Google Patents

Abstract

The closure component (4) is first positioned with a ring seal (15) on the container edge area (5). Then an axial pressure force (19) is applied on the closure area, using a pressure tool until an adequate sealing compression of the ring seal is achieved. An expanding tool is then brought into contact with a radial inner side (21) of the closure edge area an expansion tool is brought into contact. The two edge areas are expanded by the expansion tool until a firm locking is achieved. In a further step, a free end area (10) of the container edge and a free end area (13) of the closure edge are radially expanded into a cavity (16) of a safety ring (17). The ratio between the container nominal diameter and the effective axial length of the expansion tool is between 15 and 25.

Description

The invention relates to methods according to the preamble of the claim 1.

In a known method (CH patent 642 316 A5 the applicant) results in a very secure closure of the packaging container. A circlip is used. The known packaging container is not yet for use for the hazardous goods area according to the UN. This applies in particular to low-viscosity dangerous goods.

From DE 36 24 769 A1 it is known per se, one in cross section essentially rectangular, bowl-shaped container with a outwardly extending circumferential flange through a leaf-shaped, to close the flat cover cut from a metal foil. this happens with a crimp frame divided into several movable sections. With the sections, the edge of the lid blank is around the Flanged peripheral flange. There is an upper tool part on the Lid section. Each section is with a quadrilateral at one stationary holding part articulated. A lower, hook-like flange each section is in an axial closing movement of the tool guided in a curve from the outside inwards and thereby completes the edging.

From CH 391 570 A is a Method according to the preamble of claim 1 known, whereby the upper edge areas of an opening in the lid of a steel drum on the one hand and a closing member on the other hand without using a Circlips should be tightly connected. To these edge areas are initially hooked together parallel to the axis (Fig. 4). The edge areas are then driven by radially Cheek segments above and below an axially middle one, not too expanding ring zone expanded at an angle to the outside (Fig. 5). Once the closure member is open, the Do not close the opening again.

From US 4,820,100 A it is known per se to have a circular cylindrical shape Fuselage through a capping unit of a capping machine (Fig. 1) to loosely close with a bottom over a double fold. The floor is delivered with a first internal roll and in one Form recess of a bell-shaped mold introduced. Then are shaped segments in the mold recess radially outwards into an operating end position moves relative to the first internal roll (Fig. 4). Then the fuselage is pressed axially over the floor and through the stationary mold with one in the first internal curl of the floor with the second inner curl loosely rolling in (Fig. 5). Finally, the mold segments are moved radially inwards, so that the can can be removed from the machine (Fig. 6). The loose double fold is only connected in a machine Station (Fig. 7) tightly pressed with a pair of rollers.

From GB patent specification 357 558 it is known per se the edges a container opening and one inserted into the container opening, cup-shaped lids by mutual expansion form-fitting with each other connect to. There is a radially outside the edges longitudinally divided sector ring with radial circumferential grooves formed on the inside. Inside the borders is a Arranged rubber ring. The rubber ring sits on a rod below of the rubber ring carries a plate. On the top of the rubber ring there is a push ring with an upper bush on the rod is led. Has an axial approach of the plate and the push ring the result is that the rubber ring expands radially outwards and thereby press the edges into the grooves of the counter ring. If the connection wax should be placed between the edges.

The invention has for its object the security of the closure Increase packaging containers so that they also pass the type examination with UN approval marking.

This object is characterized by the features of claim 1 solved. In this way, the positive locking in particular be manufactured in a simple manner. The sealing effect is improved and prying off the closure element from the lower part with a suitable tool is facilitated.

The features of claim 2 also make an additional rule Circlip unnecessary. Depending on the size of the negative Angle is the connection e.g. detachable at an angle of 0.5 to 1 ° or insoluble at an angle of more than 2 °. This item can e.g. for lids for cans and sheet drums with a stopper or a lockable removal opening can be used. The same the item is suitable for connecting a cover ring or a funnel with screw connection to the lower part.

The counterholder according to claim 3 leads to a particularly precise shape Education. The counterhold is at least while expanding arranged stationary.

The features of claim 4 facilitate and improve the shaping at the edge.

According to claim 5, the positive locking by a bayonet lock reached. By rotation and subsequent axial movement of the closure element is the closure element from the lower part detachable and reclosable in the reverse manner. If necessary can be profiled the outer edge of the closure element to the Turning process for opening and reclosing the closure element facilitate.

According to claim 6, a significant additional stiffening is obtained the locking area. In addition, the free edge of the second Edge area of the closure element particularly during expansion Shape without constraint.

According to claim 7, there is a considerable amount in the external rolling Support effect with corresponding dimensional stability under load.

This support effect is achieved according to claim 8 especially when Loads to be expected preferably from the radially outer side are.

The features of each of claims 9 and 10 result in a significant additional stiffening of the closure area and act inadmissible Deformation of the closure area in the test or operating case opposite.

Fig. 1 einen Längsschnitt durch den Verschlußbereich einer Ausführungsform in noch nicht verschlossenem Zustand,

Fig. 2 die zugehörigen Verschließwerkzeuge in ihrer den Verschlußbereich gemäß Fig. 1 fertigstellenden Endstellung,

Fig. 3 den gemäß Fig. 2 hergestellten Verschlußbereich ohne Verschließwerkzeuge,

Fig. 4 die Schnittansicht entsprechend Linie IV-IV in Fig. 3 durch eine andere Ausführungsform,

Fig. 5 die Schnittansicht nach Linie V-V in Fig. 6 durch eine weitere Ausführungsform,

Fig. 6 die Schnittansicht nach Linie VI-VI in Fig. 5,

Fig. 7 die Schnittansicht nach Linie VII-VII in Fig. 6,

Fig. 8 einen Längsschnitt durch eine weitere Ausführungsform eines Verschlußbereichs,

Fig. 9 den Verschlußbereich gemäß Fig. 8 mit zugehörigen Verschließwerkzeugen in der aktiven Endstellung und

Fig. 10 den gemäß Fig. 9 fertiggestellten Verschlußbereich im Längsschnitt.

These and further features and advantages of the invention are explained in more detail below on the basis of the exemplary embodiments illustrated in the drawings. It shows:

1 shows a longitudinal section through the closure area of an embodiment in the not yet closed state,

2 the associated closing tools in their final position completing the closing area according to FIG. 1,

3 shows the closure area produced according to FIG. 2 without closing tools,

4 shows the sectional view according to line IV-IV in FIG. 3 through another embodiment,

5 shows the sectional view along line VV in FIG. 6 through a further embodiment,

6 shows the sectional view along line VI-VI in FIG. 5,

7 shows the sectional view along line VII-VII in FIG. 6,

8 shows a longitudinal section through a further embodiment of a closure area,

9 shows the closure area according to FIG. 8 with associated closing tools in the active end position and

FIG. 10 shows the closure area according to FIG. 9 in longitudinal section.

Fig. 1 shows a part of a packaging container 1 with a lower part 2, whose upper opening 3 is sealed by a closure element 4 shall be. The lower part 2 and the closure element 4 are made made of tinplate from e.g. 0.31mm thickness.

A first edge area 5 of the lower part 2 should have a second edge area 6 of the closure element 4 are tightly connected. In the initial state exists between a first wall 7 of the first edge region 5 and a second wall 8 of the second edge region 6 an angle 9 of e.g. 3 to 5 °. The angle 9 facilitates the insertion of the one hand Closure element 4 in the opening 3, as shown in Fig. 1, and on the other hand enables the closure elements 4 to be stacked one inside the other during storage and transportation.

A first free end region 10 of the first edge region 5 is as one External rolling trained. A free end 11 of the outside curl lies opposite a radially outer section 12 of the outer curl.

A second free end region adjoins the second wall 8 at the top 13 of the second edge region 6. The second free end region 13 ends in a curl 14 and carries an annular seal 15 which with the first free end portion 10 cooperates sealingly.

The closure element 4 is either manually or automatically in the opening 3 placed, as shown in Fig. 1. Then with an annular Press tool 18 (Fig. 2) an axial pressure force 19 to the sufficient Sealing compression of the ring seal 15 on an upper edge of the second free end region 13. As a result, the second Wall 8 is pushed a little deeper into opening 3 than this can be seen in Fig. 1. The first free end area is pressed 10 correspondingly deeper into the ring seal 15.

Then with a radially inner side 21 of the second edge region 6 brought an expanding tool 22 (FIG. 2) into contact. this happens in that distributed over the scope, not shown in detail Segments of the expanding tool 22 moved radially outward become. As a result, the first 5 and the second edge region 6 become common expands until a positive locking is achieved. While this expansion, the axial pressure force 19 is maintained, so that the second free end region 13 can be seen in FIG. 2 Way increasingly approaches the first free end region 10.

2 and 3 is at an axially outer end 26 during expansion the second wall 8 a radially beyond the outer end 26 inwardly extending bead 27 has been formed. The bead 27 stiffened the second edge area 6 and allows the second free end area 13 an optimal shape within the mold (Fig. 2).

Fig. 2 illustrates how the individual segments of the expanding tool 22 with a radial groove 28 on a radial guide ring 29 of the Pressing tool 18 are guided. So the segments of the expanding tool 22 in the directions of a double arrow 30 in the radial Direction to expand and move back to its rest position. This movement takes place through a central cone 31, the outer surface of which with a complementary sloping surface 32 of each segment of the Expanding tool 22 cooperates. The cone 31 is parallel to Longitudinal axis 33 (Fig. 15) of the packaging container 1 in the directions a double arrow 34 driven in a manner not shown in detail. The tools 18 and 22 and the cone 31 can be parallel to the longitudinal axis 33 in the directions of a double arrow 35 as a unit be moved.

2 is also an effective axial length 38 of the expanding tool 22 shown.

In all drawing figures there are the same parts with the same reference numbers Mistake.

In the embodiment of FIGS. 1 to 3, none the free end regions 10, 13 comprehensive circlip used. In Fig. 3 it can be seen that the curl 14 in this case not for positive locking with the first free end area 10 is used.

Rather, according to FIGS. 2 and 3, the positive locking brought about on the first wall 7 and the second wall 8. This will through the expanding tool 22 a pair of complementary peripheral beads 47 and 48 formed into the first wall 7 and the second wall 8. At this Forming supports a radially outside, longitudinally divided annular counterholder 49, which is in the directions of a double arrow 50 is movable. The counter-holder 49 remains stationary during the expansion in the active position shown in Fig. 2 and becomes Form the closed packaging container 1 radially outwards emotional. The counter holder has a complementary to the peripheral bead 47 Shape contour 51 on.

2, a lower part of the second free end region 13 formed by a shape contour 52 of the counter-holder 49, while a connecting part of the second free end region 13 its shape through a shape contour 53 in the pressing tool 18.

In the embodiment of FIG. 4 are in a transverse plane Packaging container 1 at a distance from each other several short pairs of Circumferential beads 47, 48 are provided. These pairs of beads 47, 48 can in the same way as the pair of beads 47, 48 according to FIGS. 1 to 3 getting produced.

In the embodiment according to FIGS. 5 to 7, the positive Locked by a bayonet lock between the first Wall 7 and the second wall 8. For this purpose, according to FIGS. 5 and 6 in the manufacture of the lower part 2 at least one open at the top Bayonet backdrop 54 molded into the first wall 7. A vertical one Branch 55 of the bayonet backdrop 54 becomes narrower than a horizontal one Branch 56 executed. When expanding later, the vertical branch 55 so expanded that it in that shown in Fig. 7 Final state is approximately the same as the horizontal branch 56. The formation of the second free end region 13 can be the same Way as in Fig. 2, possibly on the lower longitudinally split counterhold 49 in Fig. 2 are omitted can.

In Fig. 7, the expanding tool 22 is in radial alignment each bayonet backdrop 54 has a wart-like projection 57. The projection 57 forms a bayonet projection when expanding from the second wall 8 58 out thanks to the previous radial alignment engages with the bayonet backdrop 54 in the bayonet backdrop 54. The Bayonet projection 58 is indicated by dashed lines in FIG. 6.

8 to 10, the initial state according to FIG. 8 is comparable to the initial state according to FIG. 1. 8, however, a closure element 4 with a central removal opening 59 is used. The removal opening 59 is sealed by a removable and repressible plug 60 made of plastic.
However, all other closures made of plastic or metal available on the market can also be used, such as the plastic closure 64 shown in FIG. 10.

According to FIG. 9, the first wall 7 is formed by the expanding tool 22 and the second wall 8, at least over part of its axial length, at a negative angle 61 (FIG. 10) to the longitudinal axis 33 of the packaging container 1 shaped, the diameter becoming an interior 62 of the packaging container 1 enlarged. According to 9 supports the walls 7, 8 by the radially arranged outside, longitudinally divided, annular counter-holder 49 with a complementary Shape contour 63 shaped.

Claims (10)

1. M ethod of sealingly connecting a first edge region (5) of a lower part (2) of a packaging container (1) consisting of sheet metal to a second edge region (6) of a closure element (4) consisting of sheet metal,

   wherein the second edge region (6) supports an annular seal (15) which co-operates with the first edge region (5),

   and wherein, within the annular seal (15), a first wall (7) of the first edge region (5) and a second wall (8) of the second edge region (6) lie opposite each other,

   comprising the following steps:

   a) placing the closure element (4) with the annular seal (15) on the first edge region (5),

   b) exerting on the second edge region (6) an axial pressure force (19) by means of a pressure tool (18) until the annular seal (15) is compressed in a sufficiently sealed manner,

   c) contacting an expanding tool (22) with a radially inner side (21) of the second edge region (6), and

   d) expanding the first (5) and the second edge regions (6) as one by means of the expanding tool (22) until a positively locking closure is achieved,

      characterised in that in step d) the positively locking closure is produced at the first wall (7) and the second wall (8),
      and that during expansion by a corresponding shaped contour (53) in the pressure tool (18, 39) a second free end region (13) of the second edge region (6) is deformed relative to a first free end region (10) of the first edge region (5) into a position which is around the first free end region (10) and in which there is a radial spacing between the first free end region (10) and the second free end region (13) such that no positively locking closure occurs between the two free end regions (10, 13).
2. Method according to claim 1 characterised in that the first wall (7) and the second wall (8), at least over a part of the axial length thereof, are shaped by the expanding tool (22) at a negative angle (61) relative to a longitudinal axis (33) of the packaging container (1) with a diameter which increases in relation to an internal space (62) of the packaging container (1).
3. Method according to claim 2 characterised in that the first wall (7) and the second wall (8) are shaped in supporting relationship by a radially outwardly arranged, longitudinally divided, annular counter-holding member (49) with a complementary shaped contour (63).
4. Method according to one of claims 1 to 3 characterised in that arranged radially outside the edge regions (5, 6) is a longitudinally divided annular counter-holding member (49) and that during expansion by a corresponding shaped contour (52) in the counter-holding member (49) a part of the second free end region (13) of the second edge region (6) is deformed relative to the first free end region (10) of the first edge region (5) into the position which is favourable for use of the packaging container (1).
5. Method according to claim 1 characterised in that prior to step a) at least one upwardly open bayonet slot (54) is formed in the first wall (7), and that in step d) the positively locking closure is achieved in that a bayonet projection (58) which extends into the bayonet slot (54) is formed in the second wall (8) by the expanding tool (22).
6. Method according to one of claims 1 to 5 characterised in that in step d) there is formed on an axially outer end (26) of the second wall (8) a bead (27) which extends radially inwardly beyond the outer end (26).
7. Method according to one of claims 1 to 6 characterised in that prior to step a) the first free end region (10) is formed as an outwardly rolled region of at least 360°.
8. Method according to claim 7 characterised in that a free end (11) of the outwardly rolled region (10) is opposite a radially outer section (12) of the outwardly rolled region (10).
9. Method according to one of claims 1 to 8 characterised in that the ratio V = (nominal diameter of the packaging container (1)): (effective axial length (38) of the expanding tool 22)) is made 15 to 25.
10. Method according to claim 9 characterised in that the ratio V is made 18 to 22.

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