EP0249180A2 - Gable top container - Google Patents

Abstract

The invention relates to a cuboid gable packing for bulk goods made of a plastic multilayer composite on carrier material, the head of which is closed by a web seam to form two triangular folding tabs lying double at the end portions of the web seam, one folding tab each following a straight folding edge on the respective side wall is folded outside and the packing material has longitudinal and transverse or inclined groove lines for the carcass and floor or gable edges. Such a pack provides for at least one auxiliary groove line running outside the alignment of the body groove lines in the gable area to the vertical body groove lines, which ensures that when the thick-walled packs are manufactured and ultimately when they are closed in the filling machine, the durability of the fillet seam closure in it Original form of preparation is obtained, which means that packs with relatively thick composite materials that web seam breaks are now avoided.

Description

The invention relates to a cuboid gable pack for bulk goods made of a plastic multilayer composite on carrier material, the head of which is closed by a web seam to form two triangular folding flaps lying double at the end portions of the web seam, one folding flap each being folded outward around a straight folding edge onto the respective side wall and the packing material has longitudinal and transverse or inclined groove lines for the body and bottom or gable edges.

In a gable-top package, when the double-lying triangular folding flaps are folded around the transverse lateral folding edge of the package body, the tensions in the outer layers of the likewise folded-over seam are so high that so-called broken seams transverse to the seam are the result. The reasons for this are partly the unfavorable course of the fiber direction of the carrier material of the composite material (fiber course in the direction of the crease edge), the composite thickness of the composite material (carrier material in connection with sealed PE foils and in special cases laminated aluminum foil), the sealing process used and the fact to find that five bonded layers lie one above the other in the area of the crease edge. Even if the web seam breaks occur on the outside of the gable-top pack and therefore do not directly cause a leaky pack, these web seam breaks are still unsustainable because when such a pack is used as a long-term pack, moisture enters the composite layers from the outside and the entire seal and pack structure inside Is softened from the outside over time which then causes the gable pack to leak. In order to avoid or at least limit the breaking of the web seams, it has previously been forced to condition the packaging material by means of complex air conditioning (temperature and humidity regulation), ie to make it somewhat flexible for the production of the packaging.

_D a, these gable top cartons are made from a pre-grooved carton blank in that are pre-broken before the final package creation all groove lines again and brought back to the original flatness, remain by the primary crushing, back in particular in aluminum laminated blanks on the package interior side, sharp-edged Nutlinienaufwerfungen. As a result, the plastic coating of the blank, in particular in the crease cross, i.e. at the point where the longitudinal body groove lines and the cross seam base line running transversely at the upper edge of the cut intersect, penetrate when the cross seam is formed and laid flat, so that in the finished pack the filling material enters the Composite material can penetrate, thereby causing contamination of the interior of the pack and the filling material when the web seam is shaped and laid flat, so that the desired long-term durability of the filling material is not applicable.

The invention has for its object to improve the known gable pack of the type mentioned so that the web seam breaks in the folded on the narrow side of the pack, the web seam carrying triangular folding tabeh avoided and also the _R ill _k reuzbrückungen be suppressed.

This object is achieved according to the invention in that the pack, in the still aligned state, has at least one auxiliary groove line running in the gable area to at least two vertical carcase groove lines, one of which is arranged in the area of each triangular folding tab, the auxiliary groove lines being on each arranged opposite sides of the folding tab It has also been shown that the arrangement of the auxiliary groove lines diagonally opposite sides with respect to the folding tab is sufficient so that the auxiliary groove lines come to lie above and below the folded seam. In order to optimize the desired result, it is also possible to provide the packing in the gable area on each vertical carcase groove line with at least one auxiliary groove line running outside the alignment of the carcase groove line. It is envisaged that the body groove lines are not drawn into the gable area. In order to fulfill the inventive concept, in addition to the variations already mentioned with regard to the position of the auxiliary groove lines, there are also several design options which can be used depending on the packaging and composite structure of the packaging material. For example, the auxiliary groove lines can be parallel and parallel. others run at an angle to the imaginary extension of the body groove line. The position of the auxiliary groove lines in relation to the respective body groove lines and the cutting center axis is variable, so that they can be oriented on the one hand to the cutting center axis and on the other hand to the respective cutting edge, depending on what can be achieved with the better results in solving the task. It is also advantageous in certain cases if the auxiliary groove lines, starting from the carcass corners and with respect to the central cutting axis, point in pairs to the right or left. Particularly good results for avoiding web seam breaks and throwing in the crease cross area were achieved in that the auxiliary groove lines were arranged at a distance of 3 to 9 times, but preferably 6 times, the bond strength compared to the imaginary extension of the body groove lines. Furthermore, good results were obtained when the auxiliary groove lines coming from the carcase corners ended at a distance of 5 to 15 mm in front of the base seam line. However, good results are still achieved even if the auxiliary groove lines run from the carcass corners to the base seam line. Alternatively the auxiliary groove lines can run from the carcass corners to the cut edge, but it is then proposed to interrupt the web seam base line in the area of the auxiliary groove lines.

By introducing the auxiliary groove lines instead of the solid body groove lines it is achieved that in the manufacture of thick-walled packs and ultimately when closing them, the durability of the fillet seam closure is retained in its original form in the filling machine. It does not matter whether the package is made directly from the cut or from the intermediate product, the jacket. Bridge seam breaks, as were customary in the prior art, are now avoided, so that packs that have to be made from relatively thick composite materials can still be used as long-term packs, since the penetration of moisture through the bridge seam breakage is avoided. Another advantage is that the auxiliary groove lines are not congruent with the fold and pre-break lines, which is why the inner layer of the composite in the crease cross area is less strongly raised during the fold or pre-break in the folding box gluing machine (and therefore not so) with the flattened jacket, because the jacket is laid flat in the fold line and not in the auxiliary groove line. This prevents the inner polyethylene layer from being pierced when the web seam is formed and laid flat, for example by the aluminum foil which is thrown up, as a result of which the desired tightness of the coating is maintained.

For the production of packs, a method is preferably used in which the non-continuous body lines in the gable area are created and folded as folding lines in the casing formation in free folding by folding and folding the adjacent blanks, for which purpose the casings are moved in the direction of the longitudinal cutting axes , with the bottom of each jacket in Running direction is in front. With this procedure, the carrier material is tumbled through the free folding, ie without prior grooving during folding and refolding, so that the carrier material splices and becomes soft.

Preferred embodiments of the invention are shown in the drawing and are described in more detail below.

• Fig. 1 einen Schnitt durch das Verpackungsmaterial bzw. Materialverbund.
• Fig. 2 einen ebenen Zuschnitt mit parallelen Hilfsnutlinien,
• Fig. 3 einen ebenen Zuschnitt mit zur Zuschnittmittelachse geneigten schrägen Hilfsnutlinien,
• Fig. 4 einen Zuschnitteil mit im Rillkreuzbereich unterbrochenen Hilfsnutlinien,
• Fig. 5 einen Zuschnitteil mit von der Zuschnittmittelachse nach außen weisenden schrägen Hilfsnutlinien,
• Fig. 6 einen aus einem der Zuschnitte nach den Figuren 2 bis 5 gebildeten Mantel.
• Fig. 7 eine aus dem Zuschnitt nach Fig. 2 gebildete gerade verschlossene Giebelpackung in perspektivischer Darstellung,
• Fig. 8 eine Giebelpackung nach Fig. 7 mit umgelegten Faltlappen und obenliegender Seitennaht in perspektivischer Darstellung,
• Fig. 9 wie Figur 8, jedoch mit durch die Stegnaht teilweise verdeckter Seitennaht in perspektivischer Darstellung,
• Fig. 10 ein Querschnitt durch den Giebelbereich der Packung entsprechend der Schnittlinie 10 in Fig. 6.
• Fig. 11
• und 12 den Stand der Technik (Längsschnitt durch eine umgelegte Stegnaht bzw. umgelegter Faltlappen mit Stegnahtbruch) und
• Fig. 13
• und 14 den Erfindungsgegenstand (Längsschnitt durch eine umgelegte Stegnaht bzw. umgelegter Faltlappen ohne Stegnahtbruch entlang der Linie 14 in Fig. 8).
• Fig. 15 'Ausschnitt eines Zuschnittes im Giebelbereich.

Show it:

• Fig. 1 shows a section through the packaging material or composite material.
• 2 shows a flat blank with parallel auxiliary groove lines,
• 3 shows a flat blank with inclined auxiliary groove lines inclined to the center axis of the blank,
• 4 shows a cut part with auxiliary groove lines interrupted in the crease cross area,
• 5 shows a blank part with oblique auxiliary groove lines pointing outwards from the center axis of the blank,
• 6 shows a jacket formed from one of the blanks according to FIGS. 2 to 5.
• 7 is a perspective view of a just closed gable package formed from the blank according to FIG. 2,
• 8 is a perspective view of a gable pack according to FIG. 7 with folded flaps and side seam on top,
• 9 as in FIG. 8, but with a side seam partially covered by the web seam in a perspective view,
• 10 shows a cross section through the gable area of the pack corresponding to the section line 10 in FIG. 6.
• Fig. 11
• and FIG. 12 the prior art (longitudinal section through a folded web seam or folded flap with a broken web seam) and
• Fig. 13
• and 14 the object of the invention (longitudinal section through a folded web seam or folded flap without a web seam break along the line 14 in FIG. 8).
• 15 'Detail of a blank in the gable area.

In Fig. 1 it can be seen from the section of the packaging material or composite material 1 that a carrier material 2, consisting for example of a two or more layers of cardboard or foamed polystyrene on its top, which is the same as the outside of the package, with a polyethylene layer 3 is coated. Furthermore, an aluminum foil 4 with a thin polyethylene layer 5 is laminated on the lower layer pointing towards the inside of the pack in this exemplary embodiment. On the lower side of the composite cross-section, the actual inside of the pack, a thick polyethylene film 6 is laminated on, which comes into direct contact with the contents in the finished pack. Of course, different material combinations are conceivable for material composite 1 and are also practiced. For example, the carrier material 2 can have a different structure than the one described above. In addition, for example when using the gable top as a milk container, the aluminum foil 4 with the corresponding polyethylene lamination 5 is dispensed with.

2 shows a blank 7 which has been produced from the composite material 1. The known substantially rectangular blank 7 comprises a central portion, the body 8 limits an upper part, the head 9 and a lower part, the bottom 10. The body 8 is orpusnutlinien by horizontal and vertical _K 11 and 12 respectively. It is precisely these body groove lines 11, 12 which form the front of the body 13, the back of the body 14.114 and the side walls 15, 16 of the body.

The head 9 has the gable surfaces 17, 18, 118 and the triangular folding tabs 20.21. In the upper part of the head 9, the web seam base line 23 runs parallel to the upper cutting edge 22 at a relatively small distance. This web seam base line 23 runs simultaneously through the intersection of the groove lines 24, 25 delimiting the triangular folding tabs 20, 21. The dotted extensions of the vertical body edges or body groove lines 12 shown in the drawing in the head 9 are not embossed in the cut, but are later folded in the free manufacture during the production of the package or during the production of the package jacket 26 (see FIG. 6). These dotted lines are to be designated here with fold 27 to 30. At a short distance from this fold 27 to 30, parallel auxiliary groove lines 31 to 3 _{4 are introduced} into the blank. In the example shown, these parallel auxiliary groove lines 31 to 34 have been grooved into the blank in relation to the body groove lines 12 between them and an imaginary central cutting axis 35.

3 shows a blank that basically corresponds to the blank in FIG. 2. The only difference is that the auxiliary groove lines 36 to 39 no longer run parallel but now at an angle. The starting point for these auxiliary groove lines 36 to 39 each starts from the crossing points of the horizontal and vertical body groove lines 11, 12, which form the upper corner points 41 to 44 of the finished pack. The inclined position is inclined so that the end points of the auxiliary groove lines 36 to 39 end at a distance 40 from the fold lines 27 to 30 at the upper cutting edge 22 of the blank. In this case, the auxiliary groove lines 36-39 point with their oblique position to the central cutting axis 35.

4 and 5 show further variants for the auxiliary groove lines 45 to 47, these generally starting from the same corner point 41 to 44, but are now arranged to point away from the central cutting axis 35. The end point of these auxiliary groove lines 45 to 47 lies with the same offset, the distance 40 at the cutting edge 22, but as before mentioned, is now outside of the distance of the respective vertical body 12 and the cutting center axis 35. In _F ig. 4 shows another special feature in which the _auxiliary line 45 ends at a distance 48 in front of the base line 2 _{3 of} the web seam. In FIG. 5, left side, on the other hand, the auxiliary groove line ₄₆ , as described above, is carried out up to the cutting edge 22. Here the web seam base line 23 was interrupted in the area of the fold line 29 and the auxiliary groove line 46.

Strength in _F. 6 shows a jacket 26 which has been produced from the blanks 7 according to FIGS. 2 to 5 on a folding box gluing machine or in a filler. For its production, the blank 7 is guided in the direction of travel (ground ahead) according to arrow 50 through one of the aforementioned machines. The single blank pages 14,114,15 and 16 which form the respective pack sides, namely the rear side and the respective side walls, wrapped one by one from the flat position to 18 ₀ °, touching so that the respective adjacent blanks fläching be. Then these cut parts are moved back to their original position (flat position). This is known as pre-breaking. In this pre-breaking process, the fold line 27 (extension of the vertical body groove line 12) is created in free folding, since there is no crease groove in the dotted line 27. Only the adjacent auxiliary groove line 36 creates a guiding aid for the fold line 27 so that it can take a predetermined direction. As a result of this breaking, the cardboard 2 is spliced in the area of the head 9 (see FIG. 10), so that the material composite 1 becomes elastic and flexible and no longer breaks when the triangular folding flap 20, 21 is subsequently folded over (see FIG. ₁ 4 ). After the preliminary breaking, ie after the individual cut parts have been at least partially moved back in their original flat position, the edges of the later longitudinal seam 51 are activated, whereupon the rear sides 14, 114 are then moved towards one another again and joined together.

These above-described processes, such as breaking, moving apart and rejoining, are to be considered at least for the fold lines 27 to 30 as a flexing process, which leads to the multilayer carton 2 splicing in its individual layers, which, as already mentioned, leads to a non-destructive transfer the triangular folding flap 20, 21 required elasticity is achieved in particular for the web seam 52.

FIG. 7 shows in a perspective view how the parallel auxiliary groove lines 31 to 34 run with respect to the horizontal body groove lines 11 and the fold lines 27 to 30. In this state, the triangular folding tabs 20, 21 and the web seam 52 have not yet been folded over. This only happened in FIGS. 8 and 9 and is shown accordingly. The only difference between these two representations is that the web seam 52 has been turned to the left in FIG. 8 and to the right in FIG. 9.

These folding variants for the web seam 52 result from different constellations of the filling machines used in each case. It should also be pointed out that in FIGS. 8 and 9 the gable covered by the web seam 52 (FIG. 8, gable 17 and FIG. 9, gable 118) must be two times smaller 53 in order to also have one To reduce excessive tension in the upper composite layer of the web seam 52.

FIG. 10 shows a cross section of the jacket 26 from FIG. 6. The spliced areas 54 in the cardboard layer 2 can be clearly seen. The position of the individual auxiliary groove lines can also be seen, for example 36 to 39 in the folded state. The same applies to the auxiliary groove lines 31 to 34.

11 and 12 show how in the prior art all creasing lines of the individual layers lie one above the other and in

If these layers are turned over, the tension in the outer layer becomes so high that it breaks!

As can be seen from FIGS. 13 and 14, the invention first of all resulted in a distribution of the auxiliary groove lines and, moreover, a splicing of the material composites or layers to be shifted was achieved by the flexing process, so that now due to the possible larger turning radii 55 Stresses are distributed over all composite layers, thereby avoiding breaking of the outer layers.

In FIG. 15, in a section of a blank, using the example of the auxiliary groove lines in FIG. 5, a further exemplary embodiment is shown in which the web seam base line 23 is interrupted in the region of the auxiliary groove line 46 or 47, the distance 56 of the interruption being of the order of, for example is about 6 - 10 mm. Through this interruption, clear, i.e. uniform deformation conditions created that are not disturbed by a transverse groove line at any point.

Claims (18)

1.Cube-shaped gable packing for bulk goods made of a plastic multilayer composite on carrier material, the head of which is closed by a web seam to form two triangular folding flaps lying double at the end sections of the web seam, one folding flap each being folded outwards onto the respective side wall by a straight folding edge , and the packing material has longitudinal and transverse or oblique groove lines for the carcass and floor or gable edges, characterized in that the packing in the gable area (9), with the at least two vertical carcase groove lines (12) in each case, still erected. One of which is arranged in the area of each triangular folding tab (20, 21) and has at least one auxiliary groove line (31-34, 36-39, 45-47) that runs outside the alignment of the body groove line (12). 2. gable pack according to claim 1, characterized in that the auxiliary groove lines (31-34, 36-39, 45-47) are each arranged on opposite sides of the folding tabs (20, 21). 3. gable pack according to claim l, characterized in that the auxiliary groove lines (31-3 ₄ , ₃₆ -39, 45-47) are each arranged on diagonally opposite sides of the folding tabs (20, 21). 4. gable pack according to one or more of claims 1 to 3, characterized in that the pack in the gable region (9) to each vertical body groove line (12) in the still erected state at least one auxiliary groove line (31-) running outside the alignment of the body groove line (12) 34, 36-39, 45-47). 5. gable pack according to claims 1 to 4, characterized in that the body groove lines (12) are not pulled through into the gable areas (9). 6. gable pack according to claims 1 to 5, characterized in that the auxiliary groove lines (31-34) run parallel to the imaginary extension (27-30) of the body groove line. 7. gable package according to claims 1 to 5, characterized in that the auxiliary groove lines (36-39) starting from the body corners (41-44) obliquely to the imaginary extension (27- ₃ 0) of the body groove lines (12). 8. gable end package according to one or more of claims 1 to 7, characterized in that the auxiliary groove lines each between the imaginary extensions of the auxiliary groove lines (31-34, 36-39) and the central cutting axis (35) 9. gable pack according to one or more of claims 1 to ₇ , characterized in that the auxiliary groove lines (45-47) each lie outside the imaginary extensions (27-30) of the body groove lines (12) and the central cutting axis. 10. gable pack according to one or more of claims 1 to 9, characterized in that the auxiliary groove lines (36-39 and 45-47), starting from the body corners (4 ₁ - ₄₄ ) and in pairs with respect to the central cutting axis right or pointing to the left. 11. gable pack according to one or more of claims 1 to 10, characterized in that the offset (40) of the auxiliary groove lines (27-30, 36-39, 45-47) with respect to the imaginary extension (27-30) of the body groove lines (12th ) is 3 to 9 times, preferably 6 times the bond strength (1). 12. gable pack according to one or more of claims 1 to 11, characterized in that the auxiliary groove lines from the body corners (41-44) only up to a distance (48) of 5 to 15 mm from the web seam base line (23). 13. gable pack according to one or more of claims 1 to 11, characterized in that the auxiliary groove lines (47) from the body corners (41-44) to the web seam base line (23). 14. gable pack according to one or more of claims 1 to 1 ₃ , characterized in that it is made from a blank (7). 15. gable end package according to one or more of claims 1 to ₁₄ , characterized in that it is made from a flat jacket (26). 16. gable pack according to one or more of claims 1 to 15, characterized in that the web seam base line (23) is interrupted in the region of the auxiliary groove lines (46). 17. A method for producing a gable package according to claims ₁ to 16, characterized in that the non-solid body lines (12) in the gable area as fold lines in the formation of the jacket in free folding by folding and folding the adjacent blanks (114/15, 15 / 1 ₃ , 14/16, 16/24) are created and thus broken up. 18. The method according to claim 17, characterized in that the sheaths are moved in the direction of the longitudinal axes _Z (z) during the formation of the sheath, the bottom (20) of each sheath being in the running direction at the front.

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