EP0149738A2 - Machine and method for producing a packing box of metal sheet - Google Patents

Abstract

There are introduced in succession into conveying starwheels (4, 5) of a machine (1) packing boxes (2) comprising a body, a cover folded onto the body with a cover fold and a base of sheet metal folded on with a base fold (35). In a turning-in station (8), the base fold (35) is turned into the body in the axial direction. In this operation, an axially extending body fold on the base side is produced which is turned over radially inwards in a subsequent turning-over station (10) and is compressed axially towards the inside of the body in a compression station (11), which follows in turn, while gripping further around the base fold (35). <IMAGE>

Description

The invention relates to a machine according to the preamble of claim 1.

With a known machine of this type (operating instructions "Automatic edging-bottom folding machine 430" from Julius Klinghammer Maschinenfabrik, D-3300 Braunschweig, Federal Republic of Germany, 5.61), round can bodies can be flanged on both sides by upsetting heads in a first work station and a floor in a second work station standing can be folded open. The floor is folded up with two pre-rolls and two post-rolls or finished rolls.

From US Pat. No. 3,921,848 it is known to slip the bottom into the fuselage and to fold the torso fold inwards approximately up to the middle of the bottom fold under the bottom fold. A tool with a rounded head corresponding to the curvature of the base is used for the insertion.

The invention has for its object to provide a machine for turning the folds and / or folding the fuselage folds and / or dipping the fuselage folds and to provide a method for dipping.

This object is achieved with regard to the invagination by the characterizing features of claim 1. Steel sheet is particularly suitable as the sheet for the packaging container.

In the embodiments according to claim 2 or 3, the stroke of the relative axial movement is preferably adjustable. Both the insertion head and the counter-holder can be axially movable in each case. This facilitates and speeds up the transport of the packaging container into and out of the inlaying station.

According to claim 4, a securely centered support of the packaging container is guaranteed. Additional support on the trunk shoulder can take place when the adjacent fold is drawn in with respect to the trunk.

The features of claim 5 serve to securely hold the packaging container.

The features of claim 6 enable the processed packaging container to be ejected with little construction effort.

According to claim 7, a defined axial end position of the ejection piston and thus of the packaging container is reached. Ejection can also be accomplished with simple means according to claim 8. The springs are preferably evenly distributed over the circumference.

The features of claim 9 are structurally particularly simple and make good use of the available space.

With the features of claim 10, a particularly quick and efficient production can be achieved if bottom-side and lid-side insertion is required.

According to claim 11 it is ensured that the bottom rebate and the top rebate are each turned up to the desired, pre-adjustable depth in the fuselage.

The features according to claims 12 or 13 offer a safe and mechanically simple stroke limitation.

The above-mentioned object is achieved in terms of flipping through the characterizing features of claim 14.

The transfer station according to claim 15 is simple and robust.

Due to the features of claim 16, a relatively large contact surface with the counter-holder is created on the cover side. This prevents the packaging container from rotating undesirably about its longitudinal axis under the action of the folding head to be treated later.

According to claim 17, ejection is made possible with simple and reliable means. The ejection piston is expediently secured against rotation relative to the counter-holding sleeve.

According to claim 18, a structurally simple and powerful transfer station is available.

According to claim 19, a large-area contact of the counter-holding head with the bottom region of the packaging container and thus securing the packaging container against rotating entrainment by the transfer head can pass.

The features of claim 20 offer a safe ejection of the packaging container with little construction.

The rollers according to claim 21 are preferably moved radially with respect to the packaging container in and out of contact with the hull fold. The roles are e.g. are stored in roller bearings and are rotated about their own longitudinal axis by friction on the packaging container. During the folding, the packaging container stands still, so it preferably does not rotate along its longitudinal axis. Rather, the rollers run around the packaging container.

The pre-rolling and finished rolling according to claim 22 protects the material of the hull fold and leads to a gentle, wrinkle-free folding of the hull fold.

The features of claim 23 ensure simple and safe ejection of the packaging container even in this case.

According to claim 24, the friction surface preventing an unwanted rotation of the packaging container during the folding is increased.

The features of claim 25 support a gentle and precise folding of the hull fold.

The features of claims 26 or 27 also serve this purpose.

The above-mentioned object is achieved for the insertion of the hull fold by the features of claim 28.

Compared to the folding of the hull fold, the immersion leads to a further considerable increase in strength and thus operational safety on the finished packaging container.

The immersion station according to claim 29 is structurally simple and reliable.

The features of claim 30 allow the interior of the packaging container during the injection of the diving Rum ^p ffalte to be kept under overpressure. This overpressure can, for example, be of the order of magnitude of an operating pressure that will later prevail in the ready-to-use packaging container. The aim of the internal overpressure is to prevent further inversion or other undesirable deformation of the base area during the immersion. The internal overpressure acts practically as an omnipresent counterhold against the immersion stress. Compressed air is particularly suitable as the pressure fluid.

According to claim 31, the packaging container can be fixed quickly and safely in the axial direction before the internal excess pressure is built up.

According to claim 32, the ejection is solved in a simple and reliable manner.

The features of claim 33 lead to the fact that the packaging container is first brought to the sealing ring with its mouth in the sealing system, the internal overpressure is built up and only then is the immersion started.

According to claim 34, the immersion is also solved for the lid-side hull fold.

The features of claim 35 allow the bottom-side ejection of the packaging container in a simple and reliable manner.

With the features of claim 36, an internal overpressure can be built up in the packaging container even before the lid-side hull folds are immersed.

According to claim 37, a seal between the sealing member and the mouth of the packaging container is reliably accomplished in a simple manner.

The features of claim 38 allow simple actuation of the actuating element.

According to claim 39, the actuating element can also be used to guide the pressure fluid.

The features of claim 40 offer secure guidance of the ejection ring and the packaging container as long as it is immersed in the guide sleeve.

The features of claim 41 lead to a gentle, yet precise shaping of the hull fold during immersion.

The immersion station according to claim 42 enables particularly high production speeds when the bottom-side and the lid-side hull folds are to be immersed.

The above-mentioned object is also achieved with regard to immersion by the method features of claim 43. The overpressure in the interior of the packaging container during immersion provides an internal counterforce which effectively prevents an undesirable change in shape of the packaging container and in particular the surroundings of the body fold to be immersed.

• Fig. 1 eine Seitenansicht einer Maschine mit mehreren Stationen,
• Fig. 2 die Schnittansicht nach Linie 2-2 in Fig. 1 mit einem Detail der Maschine,
• Fig. 3 und 4 jeweils einen Längsschnitt durch einen Teil einer Einstülpstation für den Bodenfalz,
• Fig. 5 das Detail 5 gemäß den Fig. 4 und 20 in vergrößerter Darstellung und gegenüber diesen Figuren um 90° gedreht,
• Fig. 6 und 7 jeweils einen Längsschnitt durch einen Teil einer Umlegestation für die bodenseitige Rumpffalte,
• Fig. 8 das Detail 8 gemäß Fig. 7 in vergrößerter Darstellung und um 90° gegenüber jener Figur gedreht,
• Fig. 9 das Detail 9 in den Fig. 7 und 16 in vergrößerter Darstellung,
• Fig. 10 und 11 jeweils einen Längsschnitt durch einen Teil einer Einstauchstation für die bodenseitige Rumpffalte,
• Fig. 12 das Detail 12 gemäß den Fig. 11 und 21 in vergrößerter Darstellung und um 90° gegenüber jenen Figuren gedreht,
• Fig. 13 und 14 jeweils einen Längsschnitt durch einen Teil einer Einstülpstation für den Deckelfalz,
• Fig. 15 und 16 jeweils einen Längsschnitt durch einen Teil einer Umlegestation für die deckelseitige Rumpffalte,
• Fig. 17 bis 19 jeweils einen Längsschnitt durch einen Teil einer Einstauchstation für die deckelseitige Rumpffalte,
• Fig. 20 einen Längsschnitt durch eine Einstülpstation für den Bodenfalz und den Deckelfalz und
• Fig. 21 einen Längsschnitt durch eine Einstauchstation für die bodenseitige und die deckelseitige Rumpffalte.

The invention is explained in more detail below on the basis of the exemplary embodiments illustrated in the drawings. Show it:

• 1 is a side view of a machine with several stations,
• 2 shows the sectional view along line 2-2 in FIG. 1 with a detail of the machine,
• 3 and 4 are each a longitudinal section through part of an indentation station for the bottom fold,
• 5 shows the detail 5 according to FIGS. 4 and 20 in an enlarged representation and rotated by 90 ° with respect to these figures,
• 6 and 7 each show a longitudinal section through part of a folding station for the bottom hull fold,
• 8 shows the detail 8 according to FIG. 7 in an enlarged representation and rotated by 90 ° with respect to that figure,
• 9 shows the detail 9 in FIGS. 7 and 16 in an enlarged view,
• 10 and 11 are each a longitudinal section through part of an immersion station for the bottom hull fold,
• 12 shows the detail 12 according to FIGS. 11 and 21 in an enlarged representation and rotated by 90 ° with respect to those figures,
• 13 and 14 each have a longitudinal section through part of an insertion station for the lid fold,
• 15 and 16 are each a longitudinal section through part of a folding station for the lid-side hull fold,
• 17 to 19 each show a longitudinal section through part of an immersion station for the lid-side hull fold,
• 20 shows a longitudinal section through an inlay station for the bottom fold and the cover fold and
• 21 shows a longitudinal section through an immersion station for the bottom-side and the lid-side hull folds.

1 shows a machine 1, to which prefabricated packaging containers 2 are fed in a manner known per se and not shown. The packaging containers 2 are received in a loading station 3 (FIG. 2) by transport stars 4 and 5 arranged at an axial distance from one another, each in a circumferential recess 6 when the transport stars 4, 5 are stationary. The transport stars 4, 5 are then rotated by a division of 72 ° according to FIG. 2 in the direction of an arrow 7. As a result, the packaging container 2 introduced in the charging station 3 arrives in an insertion station 8 for a bottom fold 35 of the packaging container 2. Only this position of the packaging container 2 is shown in FIGS. 1 and 2 for simplification of the drawing. After this step has been completed, the transport stars 4, 5 are rotated by a further division of 72 ° in the direction of the arrow 7 until the packaging container 2 arrives at the folding station 8 into a transfer station 10 for a bottom-side hull fold of the packaging container 2. There the transport stars 4, 5 are brought to a standstill again and the work step in question is carried out. After this step, the transport stars 4, 5 are rotated further in the direction of arrow 7, so that in the transfer station 10 treated packaging containers 2 reach an immersion station 11 for the bottom-side hull fold where the associated work step is carried out. After this latter step has been completed, the transport stars 4, 5 are again rotated by 72 ° in the direction of the arrow 7 until the packaging container 2 treated in the immersion station 11 arrives in a removal station 12, where it is removed from the machine 1.

Thus, in each work step, a packaging container 2 is handled or processed essentially simultaneously in each of the stations 3, 8, 10, 11 and 12. A guide rail 13 coaxial with the transport stars 4, 5 holds the packaging containers 2 as they circulate in the circumferential recesses 6 of the transport stars 4, 5.

In the push-in station 8, a counter-holder 14 and a push-in head 15 are each movable in the axial direction relative to one another by a toggle lever mechanism 16 and 17.

In the transfer station 10, a counter-holder 18 by means not shown, e.g. again a toggle lever mechanism, movable in the axial direction relative to an axially stationary transfer head 19.

In the immersion station 11, a holding device 20 and an immersion head 21 are each axially movable relative to one another by means not shown.

3, the counter-holder 14 is fastened by screws 22 to a flange 23 of the machine 1. The counter-holder 14 has a counter-holding sleeve 26 which supports the adjacent cover fold 24 and a radially outwardly projecting trunk shoulder 25 of the packaging container 2 which adjoins the cover fold 24.

The counter-holding sleeve 26 is provided with three axial ones which are evenly distributed over the circumference and begin at the flange 23 Provided slots 27, in each of which a holding screw 28 is guided, which is screwed radially into an ejector piston 29 mounted axially displaceably in the counter-holding sleeve 26. The ejection piston 29 is biased by a spring 30 into an outer rest position shown in FIG. 3, in which the retaining screws 28 each abut a stop surface 31 of the counter-holding sleeve 26. The ejection piston 29 supports a curl or mouth 32 of a lid 33 of the packaging container. A body 34 of the packaging container 2 is tightly and firmly connected to the cover 33 via the cover fold 24 and to a bottom 36 of the packaging container 2 via a base fold 35 (FIG. 4).

4, the insertion head 15 is fastened to a carrier 38 of the machine 1 with a central screw 37. The push-in head 15 is surrounded by an ejection ring 39 which is biased by a plurality of springs 40 distributed over its circumference in an outer rest position projecting axially to the left in FIG. 4 over the push-in head 15. This rest position is defined by retaining screws 41 distributed over the circumference, which on the one hand are screwed into the ejection ring 39 and on the other hand cooperate with their head with a stop surface 42 of the insertion head 15.

4, the ejection ring 39 is shown in this outer rest position, in which it has just ejected the packaging container 2 and is still touching at the free end of a hull fold 43.

The insertion station 8 according to FIGS. 3 and 4 functions as follows: At the beginning, the counter-holder 14 and the insertion head 15 are moved apart axially so far that a packaging container 2 inserted into the machine 1 in the loading station (FIG. 2) is just its length fits in between. In this condition, the floor is the same area of the packaging container 2 the lid area shown in FIG. 3. The bottom rebate 35 is thus located like the top rebate 24 outside the trunk 34, a trunk shoulder corresponding to the trunk shoulder 25 producing the transition between the trunk 34 and the bottom rebate 35. Originally, the bottom rebate 35 was also drawn in relative to the fuselage 34 ("necked in"). After the packaging container 2 has been introduced centrally between the counter-holder 14 and the insertion head 15, the latter two are moved together by actuating the toggle lever mechanisms 16, 17 (FIG. 1). 3, the mouth 32 lies against the ejection piston 29 and pushes it increasingly against the force of the spring 30 into the counter-holding sleeve 26 until the lid fold 24 and the trunk shoulder 25 come to rest in seating surfaces 44 and 45. In this state, the ejection piston 29 is still at a distance from the flange 23 with its left end in FIG. 3.

At the same time, during the moving together of the counter-holder 14 and the push-in head 15 according to FIG. 4, the ejection ring 39 with its left inner edge is first brought into contact with the fuselage shoulder glue which no longer exists in FIG. 4 and corresponds to the fuselage shoulder 25. This trunk shoulder ends the movement of the ejection ring 39 to the left. Nevertheless, the push-in head 15 continues to move to the left in FIG. 4 under increasing tension of the springs 40, until it comes into contact with the bottom fold 35 and with a rounded edge 47 with the outside of the bottom 36 substantially simultaneously. As the movement of the push-in head 15 in FIG. 4 continues to the left, the bottom 36 with the bottom fold 35 is then increasingly turned inside the fuselage 34. This creates the hull fold 43 on the bottom. If this turning in continues to the desired depth the counter-holder 14 and the insertion head 15 are moved apart again synchronously. The ejection piston 29 takes over the separation of the packaging container 2 from the counter-holding sleeve 26 and the ejection ring 39 separates the packaging container 2 from the insertion head 15 until, shortly after the position shown in FIGS. 3 and 4, the packaging container 2 completely in the axial direction is released for further transport through the transport stars 4, 5 into the transfer station 10 (FIGS. 1 and 2).

Fig. 5 shows in dash-dotted lines the insertion head 15 in its axial end position in which the hull fold 43 is completed. The gaps between the individual sheet layers according to FIG. 5 normally do not exist in reality. They are only intended to clarify the graphic representation.

In FIG. 6, the counter-holder 18 has a counter-holding sleeve 48 which is fastened to a flange 50 of the machine 1 (FIG. 1) with screws 49. The counter sleeve 48 supports the cover fold 24 with a shoulder 51 and an outer ring zone of the cover 33 with a contour 52 complementary to the cover 33 when these parts have come into contact with one another. An ejection piston 53 is axially displaceably mounted in the counter-holding sleeve 48, which is biased by a spring 54 into an outer rest position shown in FIG. 6 and supports the mouth 32 of the packaging container 2 on the outside. A radial extension 55 of the Auswerfkolbens 53 slides in an axial groove 56 of the Ge ^g enhaltehülse 48 and prevents relative rotation of the Auswerfkolbens 53 and the counter-holding sleeve 48th

In Fig. 7, the folding head 19 has a stationary, non-rotating support stamp 57, which comes to achieve the largest possible contact with the floor 36 is complementary to the outer surface of the bottom 36. In the support die 57, an ejection die 58 which can be controlled by the machine 1 is axially displaceably mounted and can be pushed out into an outer ejection position which projects out on the support die 57. In FIG. 7, however, the inner or rest position of the ejecting die 58 is shown, in which it supports the center of the base 36 with its free end which is complementary to the base 36.

The transfer head 19 also has two diametrically opposite preliminary rollers 59 and two finished rollers 60 which are offset by 90 ° relative to the preliminary rollers 59. In Fig. 7 only a pre-roll 59 and a finished roll 60 offset by 90 ° is shown. The rollers 59, 60 are each freely rotatable with roller bearings, not shown, mounted on an axis 61 and 62 such that their longitudinal axes 63 and 64 run parallel to the longitudinal axis 65 of the packaging container 2.

The transfer station 10 according to FIGS. 6 and 7 functions as follows: First, the counter-holder 18 has been moved to the left so far that the packaging container 2 arriving in the transport stars 4, 5 can reach the counter-holder 18 and the transfer head 19 without contact. When it has reached its axially aligned position there, the counter-holder 18 is moved to the right in FIG. 6 until the ejection piston 53 touches the mouth 32. From this moment on, the packaging container 2 is shifted to the right in the direction of its longitudinal axis 65 in FIGS. 6 and 7. This usually happens without the ejection piston 53 moving relative to the counter-holding sleeve 48. The axial displacement of the packaging container 2 continues until its bottom 36 touches the support punch 57 and the ejection punch 58 and finds an unyielding counter bearing there. Nevertheless, from this moment on, the movement of the counter sleeve 48 continues to the right, while the ejection piston 53 remains in its position shown in FIG. 6. As a result, the spring 54 is increasingly tensioned until the contour 52 of the counter-holding sleeve 48 bears against the complementary regions of the cover fold 2L and the cover 33. This application takes place with such force that the packaging container 2 is clamped sufficiently firmly axially between the counter-holder 18 and the support die 57 and the ejecting die 58 that it does not rotate about its longitudinal axis 65 in the subsequent folding operation.

At the beginning of the folding process, the rollers 59, 60 are located at a radial distance from the fuselage 34 and the bottom fuselage fold 43, which is designed according to FIG. 5 and extends in the axial direction. The axes 61, 62 with the rollers 59, 60 run around the stationary one Packaging container 2 um. Then the two preliminary rollers 59 are first moved synchronously radially inward until they come into contact with the convex fold 43 according to FIG. 5 with a convexly curved contact surface 66 and this continues as the radially inward movement continues up to the one in FIG. 7 above see intermediate position indicated by dash-dotted lines in FIG. 8. 7, the preliminary roller 59 is drawn in its inward radial end position.

Following this partial folding of the hull fold 43, the two finished rolls 60 are also moved synchronously radially inwards until they come into contact with the convexly curved contact surfaces 66 with the partly folded hull fold 43 and the free end thereof points essentially radially inwards finally kill. This state of the fuselage fold 43 is shown at the bottom in FIG. 7 and in full lines in FIG. 8. 7, the finished roll 60 has its inner radial end position reached.

As soon as the folding process is completed in this way, the rollers 59, 60 are moved radially outward into their starting position and the counter-holder 18 and the ejecting punch 58 in FIGS. 6 and 7 are moved to the left until the packaging container 2 returns to its transport position in the Transport stars 4, 5 has taken. The packaging container 2 comes free from the support stamp 57 because the outer diameter of the support stamp 57 is smaller than the inner diameter of the free end of the fully folded hull fold 43. The ejection punch 58 is then moved back into its starting position shown in FIG. 7 by the machine control.

According to FIG. 9, the contact surface 66 of the preliminary roller 59 merges into an inward folding surface 67 which encloses a relatively small angle 69 with a radial plane 68. The folding surface 67 merges inward into an axial recess 70 of the preliminary roller 59.

The finished rolls 60 are designed in the same way as the preliminary rolls 59.

According to FIG. 10, the immersion station 11 has a holding device 71 for holding the hull fold 43 (FIG. 8) on the bottom side. The holding device 71 can be moved back and forth in the direction of the longitudinal axis 65 of the packaging container 2 by known drive means of the machine 1 (FIG. 1). In a carrier 72 of the holding device 71, an ejection piston 73 is mounted axially displaceably, which is biased by an spring 74 supported on the carrier 72 into an outer rest position to the right in FIG. 10 and on the outside with a sealing ring 75, e.g. made of rubber, the mouth 32 of the packaging container 2 supports.

With dovetail connections 76, not shown in detail, two diametrically opposed locking elements 77 designed as slides are displaceably guided on the carrier 72 at right angles to the longitudinal axis 65. Each locking element 77 can be driven synchronously back and forth by a double-acting piston-cylinder unit 78, which are each fastened to the carrier 72 with screws 80 by means of a bracket 79.

The sealing ring 75 is fastened to the ejection piston 73 with a central screw 81. A pressure fluid channel 82 is formed in the screw 81 and the ejection piston 83 and has a connection to the outside via a connecting piece 83. The connecting piece 83 can be connected via a line 84 and a 3-way / 2 position valve 85 to a pressure fluid source 86, in this case a compressed air source. In the exemplary embodiment according to FIG. 10, the directional control valve 85 is controlled by the movement of the holding device 71 in the direction of the longitudinal axis 65. An axial slot 87 is formed in the carrier 72 in the range of movement of the connecting piece 83. The outer rest position of the ejection piston 73 is defined by the contact of a ring 88 of the ejection piston 73 on a stop surface 89 of the carrier 72.

11, the immersion station 11 has an immersion head 90 which can be moved back and forth with a flange 91 and screws 92 on a carrier which can be moved back and forth in the direction of the longitudinal axis 65 of the packaging container 2 by a drive of the machine 1 (FIG. 1) which is known per se 93 of the machine 1 is attached.

A guide sleeve 95 is fastened to the flange 91 with screws 94 outside the annular immersion head 90, in which a guide ring 96, which is in sliding contact with the immersion head 90, is axially displaceably guided. The ejector ring 96 is, by means of springs 97 distributed over the circumference, in an axially above the immersion head 90 protruding, outer rest position biased and supports a radially outer area of the hull fold 43 on the outside. The guide sleeve 95 can also take over the radial guidance of the body 34 of the packaging container 2 when the bottom end of the body dips into the guide sleeve 95. The immersion head 90 has a convexly curved contact surface 98 which first comes into contact with a radially inner region of the folded-over hull fold 43 (FIG. 8).

12 shows the immersion head 90 in its axial end position which has penetrated the deepest into the packaging container 2. Correspondingly, in FIG. 12, the hull fold 43 essentially has its submerged final shape. It should also be borne in mind here that the air shown in FIG. 12 for clarification between the individual sheet metal layers either in the area of the bottom fold 35 and in the area of the hull fold 43 will either not be present in practice or only to an extremely small extent. Usually, in the area of the bottom rebate 35 and also the top rebate 24, a sealing compound is used in a manner known per se, which ensures the desired tightness of the rebate connections.

The immersion station 11 according to FIGS. 10 and 11 functions as follows: At the beginning of the work cycle, the holding device 71 (FIG. 10) and the assembly according to FIG. 11 having the immersion head 90 are moved apart axially so far that the packaging container to be processed 2 can easily be brought into the processing position by the transport stars 4, 5. The holding device 71 and the assembly according to FIG. 11 are then moved together axially. The folded hull folds 43 (FIG. 8) lie against the ejector ring 96 and the mouth 32 against the sealing ring 75.

The force of the spring 74 (FIG. 10) is set lower than the sum of the forces of the springs 97 (FIG. 11). As a result, the packaging container 2 increasingly displaces the ejection piston 73 (FIG. 10) while compressing the spring 74 into the end position shown in FIG. 10 in contact with the carrier 72 as the axial relative movement continues. The mouth 32 is pressed into a sufficient sealing system on the sealing ring 75.

Until then, the two locking elements 77 have been in their radially outer rest position. Now the piston-cylinder units 78 are actuated until the locking elements 77 have moved into their operating position shown in FIG. 10, in which they are positively locked with the outer area of the trunk shoulder 25 and the lid fold 24 and thereby the packaging container 2 in hold the axial relative position to the holding device 71 in which the mouth 32 is sealed with respect to the sealing ring 75. At this time, the directional control valve 85 is switched through to the position shown in FIG. 10, in which the pressure fluid source 86 is connected to the pressure fluid channel 82 and thus to the interior of the packaging container 2.

During this time, the holding device 71 and the assembly according to FIG. 11 continue to move axially towards one another. The packaging container 2 is increasingly immersed in the guide sleeve 95 and thereby tensioning the springs 97. Finally, the contact surface 98 of the immersion head 90 comes into contact with the folded-over hull fold 43 (FIG. 8) when the internal pressure is fully developed inside the packaging container 2 and compresses the torso fold 43 increasingly in the plunged end position shown in FIGS. 11 and 12.

The holding device 71 and the assembly according to FIG. 11 are then moved axially apart again, where 11 due to the dominance of the springs 97 via the spring 74, the ejection position shown in FIG. 11 is obtained before the locking elements 77 are retracted radially outwards in FIG. 10 and allow the ejection piston 73 to move outward under the action of its spring 74. In the meantime, the directional valve 85 has been switched through to the other switching position by the axial opening movement of the holding device 71, which ventilates the inside of the packaging container 2 via the pressure fluid channel 82. When the ring 88 finally abuts the stop surface 89 of the carrier 72, the packaging container 2 is again in the axial position relative to the machine 1 (FIG. 1) in which it has arrived with the transport stars 4, 5 and to the removal station 12 ( Fig. 2) is to be passed on.

The machine 1 according to FIG. 1 can also be equipped with stations that have the same structure and that allow the insertion, folding and immersion on the lid side of the packaging container 2. A machine equipped in this way can, in concatenation with the machine according to FIG. 1, take over the packaging containers 2 removed from the removal station 12 of the machine 1 and further process them on the cover side.

13 and 14 show an indentation station 99 for the lid fold 24, the same parts as in FIGS. 3 and 4 being provided with the same reference numbers.

13 and 14, a packaging container 2, which was previously processed in the immersion station 11 according to FIGS. 10 and 11, is processed further. Therefore, in FIG. 13, the immersed fuselage fold 43 on the bottom rests against an outer flange 100 of the ejection piston 29, which in each working cycle against the force of the spring 30 against a stop surface 101 of the Counter sleeve 26 is driven. If, instead, a packaging container 2 is to be processed in the turning-in station 99, the bottom fold 35 of which has not yet been pushed in according to FIG. 5, the counter-holding sleeve 26 expediently has seating surfaces corresponding to the seat surfaces 44, 45 in FIG. 3 for the bottom fold 35 and the adjoining one Trunk shoulder on. At the same time, in this case the ejection piston 29 would be designed on its side facing the packaging container 2 to be complementary to the outer surface of the base 36 and / or the flange 100 should be reduced in diameter to such an extent that it would only touch a radially inner region of the base fold 35.

14, an ejection piston 102 is axially displaceably mounted in the insertion head 15. The ejection piston 102 is biased by a spring 103 into an outer rest position defined by a stop surface 104 of the insertion head 15, which is shown in FIG. 14. The ejection piston 102 supports the mouth 32 of the packaging container 2.

The insertion head 15 is provided on the outside with a shoulder 105 and then on the inside with a pressing surface 106 which is complementary to an outer region of the cover 33 and which offers a particularly large and secure support of the cover 33 and the cover fold 24 during the insertion.

13 and 14 in a manner analogous to that in the insertion station 8 according to FIGS. 3 and 4. As a result, as shown schematically in FIG. 14, an inserted lid fold 24 and an axial one are obtained protruding fuselage folds 107 on the cover side, the design of which corresponds to the fuselage fold 43 produced by the folding in, as shown in FIG. 5.

15 and 16 show a folding station 108 for the fuselage fold 107 on the cover side. The basic structure and the mode of operation of the folding station 108 correspond to the folding station 10 according to FIGS. 6 and 7. The same parts are here again provided with the same reference numbers.

FIG. 15 shows a counterholder 109 which supports the base region of the packaging container 2 and has a counterhold 110 which supports the base 36 and an inner ring zone of the fuselage fold 43 which is immersed in accordance with FIG. The complementary design of the counter-holding head 110 to the bottom 36 results in a particularly large mutual contact, which prevents the packaging container 2 from rotating along its longitudinal axis 65 under the action of the rollers 59, 60 (FIG. 16).

If, in this case too, the bottom fold has not yet been turned over and further processed, the counter-holding head 110 is designed to be complementary to the bottom area of the packaging container 2 offered in each case.

The counter-holding head 110 is surrounded by an ejection ring 111 which is biased by springs 112 distributed over the circumference into an outer rest position projecting axially beyond the counter-holding head 110 and which supports an outer ring zone of the bottom fuselage fold 43 on the outside. This outer rest position is defined by retaining screws 113 distributed over the circumference, which are screwed into the ejection ring 111 and rest in the rest position with their heads against a stop surface 114 of the counter-holding head 110.

16, the support stamp 57 is in this case complementary to a central ring zone of the cover 33, and the ejection stamp 58 supports the mouth 32 of the packaging container 2.

The function of the transfer station 108 corresponds to that of the transfer station 10 (FIGS. 6 and 7).

17 to 19 show an immersion station 115 for the lid-side fuselage folds 107 folded over in the transfer station 108 corresponding to FIG. 8. The same parts as in the immersion station 11 (FIGS. 10 and 11) are provided with the same reference numbers.

17, the pressure fluid channel 82 is defined by a tubular actuating element 116, which penetrates the ejection piston 73 lengthways and looks out of both ends of the ejection piston 73. The actuating element 116 is axially displaceable relative to the ejection piston 73 and, with its left end in FIG. 17, also penetrates a sealing member 117, for example a sealing plug, e.g. made of rubber. The actuating element 116 lies on the outside with a pressure plate 118 on the sealing member 117.

A cross member 119 is fastened to the right end of the actuating element 116 in FIG. 17, with which a piston rod 120 of a piston-cylinder unit 121, which is arranged parallel to the longitudinal axis 65, is screwed. The cylinder 122 of the piston-cylinder unit 121 is fastened by a nut 123 to a crossmember 124, which in turn is fixed to the ejection piston 73 with a threaded pin 125. The double-acting piston-cylinder unit 121 is connected by lines 126 and 127 to a 4-way / 3-position valve 128, which is connected to a pressure fluid source 129.

The ejection piston 73 is secured against rotation about its longitudinal axis by a feather key 131 which is displaceable in an axial groove 130 of the carrier 93.

17, line 126 is pressurized with pressurized fluid. ) As a result, the piston rod 120 and thus the actuating element 116 are shifted to the right in FIG. 17. This pulls the pressure plate 118 to the right. The result of this is that the sealing member 117 is compressed and seals against the inner area the mouth 32 of the packaging container 2 rests. This hermetic seal between the mouth 32 and the sealing member 117 is maintained as long as the directional valve 128 remains in its switching position shown in FIG. 17. As soon as this hermetic seal is achieved, a directional control valve 85 ′ can be switched through by actuating its electromagnet 132 into the switch position shown in FIG. 17, in which the pressure fluid source 86 is connected to the interior of the packaging container 2 via the line 84 and the pressure fluid channel 82.

FIG. 18 shows the state in which the line 127 according to FIG. 17 is connected to the pressure fluid source 129 or the directional control valve 128 is subsequently in its middle, blocking switching position. Then, compared to FIG. 17, the actuating element 116 is displaced to the left relative to the ejection piston 73 and the sealing member 117 is relaxed so far that there is a radial distance between the sealing member 117 and the mouth 32, which allows the sealing member 117 to be inserted unhindered into the mouth 32 or the removal of the sealing member 117 from the mouth 32 is permitted.

19, a counterholder 133 of the immersion station 115 is fastened to the carrier 72 of the machine 1 (FIG. 1) by screws 134. In this case, the counter-holder 133, where the bottom-side fuselage fold 43 is already immersed, is complementary to the bottom 36 of the packaging container 2 in order to achieve a large-area support. The counter-holder is surrounded by an ejection ring 135, which is biased into an axially outer rest position by springs 136 distributed over the circumference and supports the fuselage fold 43 on the outside. The rest position is defined by a stop surface 137 of an outer guide sleeve 138, in which the ejection ring 135 is axially guided and which is fastened to the counter-holder 133 with screws 139. The immersion station 115 according to FIGS. 17 to 19 functions as follows: initially, the structural units shown in FIGS. 17 and 19 have moved apart axially to such an extent that the newly arriving packaging container 2 can be positioned between them without difficulty. 17 and 19 are then moved towards one another in the direction of the longitudinal axis 65. Since the sum of the forces of the springs 136 (FIG. 19) is greater than the sum of the forces of the springs 97 (FIG. 17), after the packaging container 2 has first come into contact with the ejection rings 96 and 135, the ejection ring 135 remains when the axial feed movement continues of the two structural units in its rest position shown in FIG. 19, while the ejection ring 96 is pushed axially inwards into the inserted intermediate position shown in FIG. 17. This intermediate position corresponds to the relative arrangement of the parts according to FIG. 18. Here, the axial feed movement of the structural units according to FIGS. 17 and 19 can be interrupted for a short time until, starting from the situation according to FIG. 18, after switching the directional valve 128 into 17, the actuating element 116 is drawn to the right relative to the ejection piston 73 and the sealing member 117 is thereby tensioned into the hermetically sealing position shown in FIG. 17. The delivery movement of the two structural units according to FIGS. 17 and 19 can then be continued while the interior of the packaging container 2 is placed under fluid pressure after actuation of the directional control valve 85 ′. As soon as this has been done, the contact surface 98 of the immersion head 90 comes into contact with the cover-side fuselage fold 107, which at this moment occurs, when the delivery movement of the structural units continues 8 is also folded radially inward, as shown in FIG. 18. The fuselage 107 is then immersed by the plunge head 90 and its contact surface 98 from the folded position shown in FIG. 18 into the finished end position drawn in FIG. 17 and drawn around the lid fold 24. 17 and 19 are axially moved apart again until the intermediate position shown in FIG. 17 is reached. Until then, the directional control valve 85 'has preferably been switched over and the pressure fluid supply has thereby been interrupted. In the intermediate position, the directional valve 128 is now switched through to the switching position in which the line 127 is connected to the pressure fluid source 129. As a result, the actuating element 116 is shifted to the left and the sealing member 117 is relaxed into the position shown in FIG. 18. In this position, the axial separation movement of the two units according to FIGS. 17 and 19 is continued. The mouth 32 separates easily from the sealing member 117 under the combined action of the ejection ring 96 and the gaseous pressure fluid escaping through the annular gap 32/117 brought its axial position in which can be passed on to the removal station 12 (Fig. 2) by the transport stars 4,5. If necessary, the directional control valve 85 'is only switched over now.

As mentioned, the insertion station 99, the transfer station 108 and the immersion station 115 can be accommodated in a machine corresponding to the machine 1 according to FIG. 1, which is connected downstream of the machine 1 according to FIG. 1. The stations 99, 108 and 155 can, however, also be accommodated between the stations 11 and 12 in the machine 1 according to FIG. 1. In the latter case, the bottom-side hull folds would first be produced, folded over and dipped in each packaging container 2 in one and the same machine 1, and then the lid-side hull folds would be produced,
thrown and dipped.

All of these functions can be implemented even more compactly in a common machine or in successive machines. The embodiments according to FIGS. 20 and 21 to be described serve for this purpose. According to FIG. 20, the folding in of the bottom fold and the cover fold takes place essentially simultaneously in a common station. Subsequently, in the same machine, the bottom fuselage fold 43 can be folded over with a folding station corresponding to the folding station 10 in FIGS. 6 and 7. This is followed by the folding of the fuselage 107 on the cover side in a folding station which corresponds to the folding station 108 according to FIGS. 15 and 16. Subsequently, the bottom-side hull folds and the lid-side hull folds can be immersed essentially simultaneously in a common station according to FIG. 21, whereupon the then finished packaging container 2 can be passed on to a removal station corresponding to the removal station 12 in FIG. 2.

20 and 21, the same parts as in previous figures are provided with the same reference numbers. FIG. 20 shows an indentation station 140 in which, with a first indentation head 141 and a second indentation head 142, the lid fold 24 and the bottom fold 35 of the packaging container 2 can be inserted at least approximately simultaneously, forming the torso folds 107, 43. It is ensured that both the top fold 24 and the bottom fold 35 reach a desired axial end position within the body 34. For this purpose, the first insertion head 141 is surrounded by a limiting ring 143 which can be adjusted axially relative to the first insertion head 141. This adjustment is made by at least three adjusting screws 144 distributed over the circumference, which are fixed axially relative to the first insertion head 141 by a collar 145 and screwed into the limiting ring 143. With a lock nut 146, each set screw 144 can be fixed when the desired axial setting of the limiting ring 143 has been reached. The limiting ring 143 ends the lid-side insertion as soon as the lid-side hull fold 107 comes into contact with the limiting ring 143.

In a similar way, the second insertion head 142 is provided with a limiting device 147, which has at least three adjusting screws 145, which are distributed over the circumference and are designed as threaded pins. Each set screw 148 is screwed into a threaded bore 149 parallel to the longitudinal axis 65, in which a head 150 of the associated retaining screw 41 is axially freely displaceable. For example, the heads 150 of the retaining screws 41 find a stop surface 151 on the adjusting screws 148, which limits the axial path of the ejection ring 39 supporting the fuselage fold 43 on the bottom. Each set screw 148 can be secured in the desired axial position by a lock nut 152.

FIG. 21 shows an immersion station 153 which immerses the bottom-side hull fold 43 essentially simultaneously with a first immersion device 154 and the hull fold 107 on the cover side with a second immersion device 155. The same parts as in FIGS. 11, 17 and -19 are provided with the same reference numbers in FIG. 21. The function of the immersion station 153 also corresponds to that in the immersion stations 11 and 115.

Claims (43)

1. Machine (1) for producing a packaging container (2), in particular a spray can, with a hull (34) made of sheet metal to which a cover (33) and / or base (36) each made of sheet metal along a cover fold (24 ) and / or a bottom rebate (35),
characterized in that the machine (1) has at least one turning-in station (8; 99; 140) in which the top fold (24) and / or the bottom fold (35) wholly or partly into one to form a torso fold (107; 43) Interior of the fuselage (34) is slipped. (Fig. 3,4; 13,14,20.) 2. Machine according to claim 1, characterized in that the indentation station (8) for the bottom region a counter-holder supporting the lid region (14) and with the bottom (36) and / or with the bottom rebate (35) can be brought in contact with the inlay head (15 ), the counter-holder (14) and the insertion head (15) being axially movable relative to one another. (Fig. 3,4.) 3. Machine according to claim 1, characterized in that the push-in station (99) for the cover area has a counter-support (14) supporting the base area and a push-in head (15) which can be brought into contact with the cover (33) and / or with the cover fold (24). The counter-holder (14) and the insertion head (15) can be moved axially relative to one another. (Fig. 13,14.) 4. Machine according to claim 2 or 3, characterized in that the counter-holder (14) has an adjacent fold (24.35) and an adjacent to the fold (24 _; 35) fuselage shoulder (25) supporting support sleeve (26). (Fig. 3.) 5. Machine according to claim 2 or 3, characterized in that the counter-holder (14) has a counter-holding sleeve (26) leading radially to the adjacent packaging container region. (Fig. 13.) 6. Machine according to claim 4 or 5, characterized in that in the counter-holding sleeve (26) an ejector piston (29) is axially displaceably mounted, and that the ejector piston (29) is biased by a spring (30) into an outer rest position and outside supports the lid area or the bottom area. (Fig. 3.13.) 7. Machine according to claim 6, characterized in that the displacement of the ejection piston (29) to the outside and optionally inwards by stop surfaces (31; 101) of the counter-holding sleeve (26) is limited. (Fig. 3.13.) 8. Machine according to one of claims 2 to 7, characterized in that the insertion head (15.142) is surrounded by an ejector ring (39) which springs (40) in an axially beyond the Eirstülpkopf (15; 142), outer rest position is biased and the outside one adjacent to the adjacent fold (35) The shoulder of the trunk or the free end of the trunk fold (43). (Fig. 4; 20) 9. Machine according to one of claims 2 to 7, characterized in that an ejection piston (102) is axially displaceably mounted in the insertion head (15), and that the ejection piston (102) is biased by a spring (103) into an outer rest position and supports the lid area or the bottom area on the outside. (Fig. 14.) 10. Machine according to claim 1, characterized in that the insertion station (140) for the at least approximately simultaneous insertion of the cover fold (24) and the bottom fold (35) one with the cover (33) and / or with the cover fold (24) in Has first insertable head (141) which can be brought into contact and a second insertable head (142) which can be brought into contact with the base (36) and / or with the bottom fold (35), the insertable heads (141, 142) being axially movable relative to one another. (Fig. 20.) 11. Machine according to claim 10, characterized in that the second indentation head (142) is surrounded by an ejection ring (39) which is biased by springs (40) into an outer rest position projecting axially beyond the second indentation head (142), that the ejection ring (39) supports on the outside a fuselage shoulder adjoining the adjacent bottom fold (35) or the free end of the fuselage fold (43), that the axial path of the ejection ring (39) against the force of the springs (40) is limited inwards by a limiting device (147) which can be adjusted in the axial direction, that the first insertion head (141) is adjustable axially relative to the first insertion head (141) Boundary ring (143) is surrounded, that the limiting ring (143) cooperates on the outside with the free end of the hull fold (107), and that an ejector piston (102) supporting the cover (33) is axially displaceably mounted in the first insertion head (141). (Fig. 20.) 12. Machine according to claim 11, characterized in that the limiting device (147) in the second insertion head (142) has set screws (148). (Fig. 20.) 13. Machine according to claim 11 or 12, characterized in that in the limiting ring (143) axially relative to the first insertion head (141) set screws (144) are screwed. (Fig. 20.) 14. Machine according to one of claims 1 to 13, characterized in that the machine (1) at least one Umlegestation _(10; 108), in which the body ply (43 _107th), radially inwardly over the Deckelfalz (24) and / or projecting the bottom fold (35), can be folded down. (Fig. 6,7; 15,16.) 15. Machine according to claim 14, characterized in that the folding station (10) for the bottom area a counter-support supporting the lid area (18) and with the bottom (36) and with the adjacent fuselage fold (43) can be brought into contact with the folding head (19) The counter holder (18) can be moved axially relative to the folding head (19). (Fig. 6,7.) 16. Machine according to claim 15, characterized in that the counter-holder (18) has a cover sleeve (48) supporting the cover fold (24) and an outer ring zone of the cover (33). (Fig. 6.) 17. Machine according to claim 16, characterized in that an ejector piston (53) is axially displaceably mounted in the counter-holding sleeve (48), and that the ejector piston (53) is biased by a spring (54) into an outer rest position and the outside one inner ring zone (cf. 32) of the cover (33). (Fig. 6.) 18. Machine according to claim 14, characterized in that the folding station (108) for the cover area has a counter support supporting the bottom area (109) and a cover head (19) which can be brought into contact with the cover (33) and with the adjacent trunk fold (107). The counter holder (109) can be moved axially relative to the folding head (19). (Fig. 15,16.) 19. Machine according to claim 18, characterized in that the counter-holder (109) has a counter-holding head (110) which supports the base (36) and - at least one inner ring zone of the bottom fold (35) or the adjacent trunk fold (43). (Fig. 15.) 20. Machine according to claim 19, characterized in that the counter-holding head (110) is surrounded by an ejection ring (111) which is biased by springs (112) in an axially projecting over the counter-holding head (110), outer rest position and the outside one supports the outer ring zone of the bottom fold (35) or the adjacent torso fold (43). (Fig. 15.) 21. Machine according to one of claims 15 to 20, characterized in that each transfer head (19) at least one pair diametrically opposite, the adjacent one. Fuselage folds (43 _; 107) which have rollers (59 _; 60) revolving around the packaging container (2) and a central, machine-fixed support stamp (57) supporting the base (36) or the cover (33), and that the outer diameter of the support plunger (57) is smaller than the inner diameter of the free end of the folded hull folds (43 _; 107). (Fig. 7 _; 16.) 22. Machine according to claim 21, characterized in that each folding head (19) a pair of the fuselage folds (43; 107) partially folding pre-rollers (59) and a pair arranged offset in relation to the pre-rollers (59) in the circumferential direction, the folding of the fuselage ( 43; 107) has finished finished rolls (60). (Fig. 7 _; 16.) 23. Machine according to claim 21 or 22, characterized in that in the support stamp (57) a by the machine (1) controllable ejecting stamp (58) is axially displaceably mounted, and that the ejecting stamp (58) into an outer, from the support stamp (57) outstanding ejection position can be pushed out. _(. Fig. 7 16.) 24. Machine according to claim 23, characterized in that the ejection punch (58) supports the bottom (36) or the cover (33) in an inner or rest position. (Fig. 7; 16.) 25. Machine according to one of claims 21 to 24, characterized in that the longitudinal axis (63.64) of each roller (59 _; 60) is arranged at least approximately parallel to the longitudinal axis (65) of the packaging container (2), that the rollers (59; 60) of each pair of rollers can be moved synchronously radially with respect to the packaging container (2), that each roller (59 _; 60) has a convexly curved contact surface (66) which first comes into contact with the trunk fold (43 _; 107), and that the contact surface (66) merges into an at least approximately radially inward folding surface (67) of the roller (59 _; 60). (Fig. 9.) 26. Machine according to claim 25, characterized in that the folding surface (67) with a radial plane (68) encloses an angle (69) of the order of 5 °. (Fig. 9.) 27. Machine according to claim 25 or 26, characterized in that the folding surface (67) merges inwards into an axial recess (70) of the roller (59 _; 60). (Fig. 9.) 28. Machine according to one of claims 1 to 27, characterized in that the machine (1) has at least one immersion station (11; 115; 153) in which the free end of the torso folds (43; 107) from its folded position (Fig . 8) in the axial direction further around the lid fold (24) and / or the bottom fold (35) around. (Fig. 10,11; 17 to 19; 21.) 29. Machine according to claim 28, characterized in that the immersion station (11) for the bottom-side hull fold (43) has a holding device holding the cover area (71) and a immersion head (90) which can be brought into contact with the hull fold (43), the Holding device (71) and the immersion head (90) are axially movable relative to each other. (Fig. 10, 11.) 30. Machine according to claim 29, characterized in that in the holding device (71) an ejection piston (73) is axially displaceably mounted, _ that the ejection piston (73) is biased into an outer rest position by a spring (74) and supports an opening (32) of the cover (33) with a sealing ring (75), that the holding device (71) has at least two locking elements (77) which can be moved transversely to the longitudinal axis (65) of the packaging container (2) and hold the packaging container (2) with its mouth (32) in tight contact with the sealing ring (75) , and that within the sealing ring (75) a pressure fluid channel (82) of the ejection piston (73) opens, which can be connected at its other end to an external pressure fluid source (86). (Fig. 10.) 31. Machine according to claim 30, characterized in that each locking element (77) is designed as a slidably engageable with part of the circumference of the packaging container (2). (Fig. 10.) 32. Machine according to one of claims 29 to 31, characterized in that the immersion head (90) is surrounded by an ejection ring (96) which is biased by springs (97) into an outer rest position projecting axially beyond the immersion head (90) and supports a radially outer region of the fuselage fold (43) on the outside. (Fig. 11.) 33. Machine according to claim 32, characterized in that the sum of the forces of the springs (97) of the plunging head (90) is greater than the force of the spring (74) of the ejection piston (73) of the holding device (71). (Fig. 10,11.) 34. Machine according to claim 28, characterized in that the immersion station (115) for the lid-side hull fold (107) has a radially inner part of the bottom area supporting counter-holder (133) and with the hull fold (107) can be brought into contact with an immersion head (90) The counter-holder (133) and the immersion head (90) can be moved axially relative to one another. (Fig. 17,19.) 35. Machine according to claim 34, characterized in that the counter-holder (133) is surrounded by an ejector ring (135) which is biased by springs (136) in an axially outer rest position and supports a radially outer part of the bottom region on the outside. (Fig. 19.) 36. Machine according to claim 34 or 35, characterized in that an ejection piston (73) is mounted axially displaceably radially inside the immersion head (90), that the ejection piston (73) is biased by a spring (74) in the direction of the packaging container (2) and has a sealing member (117) which cooperates with a mouth (32) of the cover (33), that a pressure fluid channel (82) of the ejection piston (73) opens inside the sealing member (117) and can be connected at its other end to a pressure fluid source (86), that the immersion head (90) is surrounded by an ejection ring (96) which is biased by springs (97) into an outer rest position projecting axially beyond the immersion head (90) and which supports a radially outer region of the cover-side hull fold (107) on the outside . (Fig. 17.) 37. Machine according to claim 36, characterized in that the sealing member (117) is designed as a partially insertable into the mouth (32), elastic sealing plug, and that on the packaging container (2) facing side of the sealing plug is a pressure plate (118) to which an actuating element (116), which penetrates the sealing plug and the ejection piston (73) and is axially movable relative to the ejection piston (73), is fastened. (-Fig. 17.) 38. Machine according to claim 37, characterized in that the actuating element (116) is axially displaceable by a piston-cylinder unit (121) supported on the ejection piston (73). (Fig. 17.) 39. Machine according to claim 37 or 38, characterized in that the actuating element (116) defines the pressure fluid channel (82). (Fig. 17.) 40. Machine according to one of claims 32 to 39, characterized in that the ejection ring (96; 135) is guided in a radially outer guide sleeve (95 _; 138). (Fig. 11; 17,19; 21.) 41. Machine according to one of claims 29 to 40, characterized in that each plunging head (90) has a convexly curved contact surface (98) which first comes into contact with a radially inner region of the folded-over fuselage folds (43 _; 107). (Fig. 11 _, 12 _; 17 _; 21.) 42. Machine according to claim 28, characterized in that the immersion station (153) for the at least approximately simultaneous immersion of the folded bottom (43) and folded cover-side (107) fuselage folds a first immersion device (154) which can be brought into contact with the bottom fuselage fold (43) ) according to one of Claims 32, 40 and 41 and a second immersion device (155) according to one of Claims 36 to 41 which can be brought into contact with the lid-side hull fold (107), the immersion devices (154, 155) being axially movable relative to one another. (Fig. 21.) 43. A method for producing a packaging container (2), in particular a spray can, comprising the following steps: (a) a cover (33) and / or base (36) made of sheet metal is folded along a cover fold (24) and / or a base fold (35) onto a hull (34) consisting of sheet metal _; (b) the top fold (24) and / or the bottom fold (35) is pressed in the axial direction into the fuselage (34) and a fuselage fold (107; 43) is formed; and (c) the torso fold (43 _; 107) is folded inwards in the radial direction;
characterized by the following steps: (d) the interior of the packaging container (2) is subjected to a pressure fluid of increased pressure compared to the environment after step (c); (e) the lid-side and / or bottom-side fuselage folds (43; 107) folded over in accordance with step (c) are immersed inward in the axial direction, encompassing the adjacent fold (35 _; 24). and (f) the fluid pressure given in step (d) is released to ambient pressure. (Fig. 10,11; 17,18, 19; 21.)

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