EP0401546B1 - Package for fluid materials and method of producing same - Google Patents

Abstract

A package for liquids is described having a tube (1) which has side walls (3-6), which are connected to one another via a longitudinal sealing seam (2), and consists of plastic-coated paper. The package is provided with a lid made of plastic which is sprayed onto the end of the tube (1). <??>Additionally, a method of producing a package of this type is also described. <??>In order to provide better dimensional accuracy in the lid region for such a package with favourable tightness characteristics and an easy opening possibility, provision is made for the package for the tube (1) to be extended at its lid-side end on at least two opposite edges (11, 11') by one wall area (8, 9; 8' 9') in each case which projects at an angle to the side wall (3, 5), the lid being sprayed onto the edge (10), facing the centre of the lid, of said wall area. <IMAGE>

Description

The invention relates to a package for flowable substances, in particular milk and juices, with a square tube in cross section, which has four flat side walls connected to one another by a longitudinal sealing seam and consists of a plastic-coated carrier material, such as paper or cardboard, and with one at the end the plastic molded cover of the tube, the tube being extended at its cover-side end on at least two edges which are at least partially opposite each other, each with a wall field which protrudes at an angle to the side wall and on the edge of which the cover facing the center is molded, which is also molded onto the unextended edge of the tube.

The invention further relates to a method for producing such a pack.

A pack and a manufacturing method for such a pack with the above-mentioned features are known from EP-A-0.241.844. Tubes are used to produce tubes from packaging material, the bottom of which is formed by folding from the end material of the tube and the cover of which is molded onto the opposite end of the tube. For this injection, the tube is drawn onto a mandrel, which forms the inner shape, so to speak, while from the outside preferably two outer mold jaws are arranged at a distance above the end face of the dome and under an injection unit in such a way that an injection cavity is formed between the outer and inner shapes. Melted plastic, preferably a thermoplastic, is injected into this from the injection unit, which connects to the plastic on the carrier material at the end of the tube and results in a liquid-tight edge between the tube and the cover.

It has now been shown that such covers are expediently also provided with an opening device because the spraying technique permits the formation of tabs, gripping rings, lines of weakness on plastic covers. Opening devices are usually provided with lines of weakness that surround tear-open tabs and provide predetermined breaking lines for the end user to open the pack.

Another package is known from EP-A-0.236.556, in which, however, only one opening device is injected into the hole in the top of paper.

The manufacturer of packs of the type mentioned initially not only wishes to maintain exact dimensions of the lid wall and also the arrangement of the opening device in the lid, but in particular an exact configuration of the predetermined breaking or weakening lines, the thickness of which should be as accurate as possible in relation to the lid wall thickness without the tools become too elaborate and complicated.

In the case of the conventional packs with a round or polygonal cross section, the lid was welded to surfaces whose straight extension is transverse to the lid plane. This structure and the corresponding manufacture mean that the inner shape, namely the mandrel, and the outer shape, e.g. two outer mold halves, free-floating in the end area, where they face each other and form the spray cavity. The inside and outside shapes of the tool are therefore only exactly positioned and held on the outside next to the subsequent product of machine parts. Machine parts always have tolerances, and since carrier materials such as paper or cardboard are never exactly stiff and of the same thickness but also have tolerances, it is clear to the person skilled in the art that in the operation of spraying, i.e. when pressing in molten plastic, the spray cavity is variable within small tolerances. As a result, product batches of different thicknesses and thus also different weakening grooves or predetermined breaking lines result.

The invention has for its object to avoid the aforementioned disadvantages to create a pack of the type mentioned, which retains the favorable properties of tightness, easy opening, possibly reclosable, and yet has better dimensional accuracy in the lid area, especially on the lines of weakness; whereby a manufacturing method of a known type is to be improved so that a more precise pressure setting of the plastic in the injection cavity between the inner and outer molded parts and nevertheless a better dimensional accuracy of the molded part are possible.

With regard to the product, ie the package for flowable substances, the object is achieved according to the invention in that a wall panel in the form of a narrow flap is connected to the respective side wall at the respective end edge of the cover of two opposite side walls. These wall panels according to the invention allow the inner shape to be supported against the outer shape or vice versa. In other words, the inner and outer molded parts of the injection mold no longer have to be supported by machine parts on a path outside the product alone during the production of the new package according to the invention, but can be mutually supported via the wall fields arranged in between. The inner and outer shape are no longer floating against each other arranged, since the carrier material, in particular paper, is hardly compressible or, at least when pressed together, requires significantly smaller spacing tolerances than was previously possible with known tools by means of shoulders, bolts, etc. As a result, packs with lids of tighter tolerances can also be produced over longer operating times of the production machine. The entire injection molding process is carried out with greater accuracy in the manufacture of the product described according to the invention, because even the pressure adjustment of one molded part and the counterpressure by the other molded part with the intermediate carrier material result in contact of the molded parts with one another, and thus exact thickness settings of walls and weakening lines.

A narrow flap made of paper is sufficient as the connecting material between the outer shape and the inner shape, so that nothing needs to be changed in the basic design of the pack, the tube of which is made on the cover side with a cover without a carrier material, which is why the advantages of the previous types of pack are retained. It is true that the pack can also be given a round cross-sectional shape, so that the essentially flat lid is round and has a disk shape, the wall panels in question being formed as trapezoidal, triangular, rectangular, oval, round or in another configuration on the tube edge can and bring the desired molded parts, but a tube with a square cross-section has proven to be extremely inexpensive for this configuration and for particularly simple tools.

In an advantageous embodiment of the invention, there is a wall panel in the form of a narrow tab on each end edge of the four flat side walls on the cover side connected to the respective side wall via a fold line. Then the inner molded part is supported against the outer molded part along the entire circumference of the tube end. The tools can even be made even simpler because the injection of plastic after the injection cavity has been filled only causes leaks at the four corners, that is to say only at four points, so to speak, which are otherwise arranged symmetrically.

With regard to this problem, it is particularly advantageous if, according to the invention, the diagonal gap between adjacent wall fields in the plane of the cover is also filled with plastic, which surrounds the adjacent paper edges and extends at least partially in all three spatial directions beyond the boundaries of the diagonal gap. In the case of the embodiment under consideration with a tube consisting of four flat side walls and wall panels molded onto the ends on the cover side, a short diagonal gap is formed between adjacent wall panels, the length of which corresponds approximately to the height of the respective wall panel. The height is seen in the direction perpendicular to the tube edge. This diagonal gap extends into the corner at the end of the tube and should be completely filled with plastic according to the teaching of the invention. The tool is designed so that this elongated plastic bead not only fills the diagonal gap but also encompasses the adjacent paper edges. This results in a firm connection between adjacent wall panels and the cover, and at the same time the sealing properties are improved, particularly in the critical corner points of a package that is quadrangular in cross section. A further solidification in the corner points then results from the extension of this elongated plastic bead in all three spatial directions beyond the boundaries of the diagonal gap. Those skilled in the art know that leaks of liquid plastic occurring at the paper edges are difficult to control during injection molding. The dimensions in the corners are so small that tolerances for controlling these leaks can hardly be set up small enough without excessive machine expenditure. Therefore, you allow the plastic to flow into the diagonal gap and beyond its limits, there is no need to pay too much attention to tolerances and you still get a tight and tight connection between the lid and tube, especially in the corner areas. The use of simpler tools is the consequence appreciated by the expert.

With regard to the above-described method for producing a pack for flowable substances, the object is achieved according to the invention in that a carrier material web coated with plastic is cut lengthwise approximately in the middle and shaped to form two webs forming the respective tube of the pack, which is thereby formed The resulting stepped edge of each web is provided as the lid-side edge of the tube, the cut of which is separated from the web by separating the web transversely to its running direction and provided with a longitudinal sealing seam to form the tube, that two wall fields protruding from the lid-side end of the tube in an extension of opposite side walls in the surface of the lid is folded over and the lid is molded onto the free edge of the wall panel and the adjacent step end edge and onto the edges of the non-extended side walls. With this manufacturing process, simple plastic sheets with little material waste can be used and tube blanks can be produced which are provided on the desired, at least partially opposite sides with the wall panels, by means of which the inner and outer molds are to be supported during injection molding. These wall panels are initially still in the plane of the blank and are then folded out or folded over from the planes of the side walls before, during or after the folding over of the individual side walls of the tube. The tube thus produced for injection molding can be drawn onto the mandrel before, during or after the folding over of the wall panels with respect to the tube side walls and can be conveyed under the injection unit. The plastic cover is then molded on without a carrier material. If one considers a tube with a square cross section of the above-mentioned features, then the cover is molded on, on the one hand, onto two wall fields which are essentially opposite one another, and, on the other hand, onto the intermediate ones Tube end edges.

Considering another embodiment of the invention, one should provide to solve the problem with regard to the method that a plastic-coated carrier material web is cut lengthwise approximately in the middle and shaped to form two webs forming the respective tube of the pack, the cut the bottom edge of one tube or its bottom folding parts and the lid-side edge of the adjacent tube forms, the blanks of the respective tube are separated by separating the web transversely to their running direction, the respective blank for tube formation is provided with a longitudinal sealing seam that four, at The end of the tube on the cover end is folded over into the surface of the cover as an extension of the wall sections projecting from the side walls, and the cover is molded onto the free edge of the wall sections and their adjacent step end edges until they come into contact with the folded edges. The latter is only the case in the case of a square pack with four wall panels in the area of the diagonal gap between two wall panels described above. In this embodiment, the injection takes place point by point on the end edge of the tube. Essentially, the plastic is injected to form the lid of the package along the free, essentially inwardly projecting edges of the wall panels.

Although various embodiments of packs have been proposed which are intended to support the injection molds against one another, the respective tube can be produced from a web of a double row of blanks without having to accept excessive waste.

Rather, it is advantageous if a person skilled in the art observes the teaching of the invention that, according to the invention, parallelogram-like waste pieces of alternating inclination are formed by the stepwise longitudinal section through the web. If the first-described embodiment is chosen with only two substantially opposite wall fields , the two rows of blanks arranged one behind the other can be arranged side by side in such a way that the respective cover side of one row of blanks is arranged directly opposite the end edge of the other row of blanks on the cover side. The tube parts forming the base by folding are then each arranged facing away from the common center line of the cutting path, and the parallelogram-like waste pieces mentioned arise in the area of the common cutting edge.

If you choose the other embodiment with the four wall fields, so that practically only the diagonal gaps form a punctiform access to the end of the tube, the skilled person should take care when observing the teaching according to the invention that triangular and trapezoidal waste pieces through the stepwise longitudinal section through the web be formed. These also form in the area of the common cutting edge. In this embodiment, that is, when four wall parts extend the tube end edge, the cover-side edge of one row meets the bottom edge of the other row at the common cutting edge of the rows of cuts lying approximately in the middle of the web. The triangular and trapezoidal waste pieces mentioned then result between these, with more triangular than trapezoidal waste pieces occurring, preferably in a ratio of 4: 1.

Figur 1

perspektivisch den oberen Teil eines im Querschnitt viereckigen Tubus mit zwei einander gegenüberliegenden Wandfeldern in Form schmaler Laschen,

Figur 2

eine schematische und unten abgebrochene Querschnittsansicht durch den Tubus der Figur 1 entlang der Linie II-II der Figur 1,

Figur 3

eine doppelreihige Zuschnittsbahn zur Herstellung eines Tubus nach Figur 1 oder 2,

Figur 4

Abfallstücke bei der Herstellung der Zuschnitte für einen Tubus nach Figur 1 aus Bahnen gemäß Figur 3,

Figur 5

eine andere Ausführungsform eines Packungstubus in ähnlicher Darstellung wie Figur 1, jedoch hier mit vier einander gegenüberliegenden Wandfeldern an einem im Querschnitt viereckigen Tubus,

Figur 6

eine weitere andere Ausführungsform der deckelseitigen Tubusendkante mit vier einander im wesentlichen gegenüberliegend angeordneten Wandfeldern, wobei jedoch an der dem Betrachter zugewandten Ecke eine Ausnehmung angebracht ist, in welcher mit einem nicht dargestellten Werkzeug entsprechende Ausgießeinrichtungen angespritzt werden können,

Figur 7

eine Zuschnittsbahn zur Herstellung eines Tubus gemäß Figur 5,

Figur 8

die bei der Herstellung des Tubus gemäß Figur 5 aus der Bahn nach Figur 7 anfallenden Abfallstücke,

Figur 9

eine Draufsicht auf den Tubus der Figur 5 mit den vier einander gegenüberliegenden Wandfeldern,

Figur 10

eine abgebrochene und vergrößerte Einzelansicht auf eine Ecke am deckelseitigen Tubusende, wo zwei benachbarte Wandfelder einen Diagonalspalt bilden,

Figur 11

eine Querschnittsansicht durch den Diagonalspalt der Figur 10 entlang der Linie XI-XI der Figur 10, und zwar als Vertikalschnitt, wenn man die Packungstuben gemäß den Figuren 1, 2, 5 und 6 aufrecht stehend annimmt, so daß ihre Seitenwände in vertikalen Ebenen liegen,

Figur 12

abgebrochen schematisch eine vertikale Querschnittsansicht der mit Kunststoff umspritzten Tubusendkante mit Wandfeld im Diagonalspalt, und

Figur 13

einen Deckel.

Further advantages and possible uses of the present invention result from the following description of preferred exemplary embodiments in conjunction with the attached figures. Show it:

Figure 1

in perspective the upper part of a tube with a square cross-section and two opposing wall fields in the form of narrow tabs,

Figure 2

2 shows a schematic cross-sectional view, broken off below, through the tube of FIG. 1 along the line II-II of FIG. 1,

Figure 3

a double-row blank for production a tube according to Figure 1 or 2,

Figure 4

Waste pieces in the production of the blanks for a tube according to FIG. 1 from webs according to FIG. 3,

Figure 5

another embodiment of a packing tube in a representation similar to that of FIG. 1, but here with four opposing wall fields on a tube with a square cross section,

Figure 6

a further different embodiment of the end of the tube on the cover side with four wall fields arranged essentially opposite one another, however a recess is made in the corner facing the viewer, in which corresponding pouring devices can be injection molded with a tool (not shown),

Figure 7

5 shows a cutting path for producing a tube according to FIG. 5,

Figure 8

the waste pieces arising from the web according to FIG. 7 during the manufacture of the tube according to FIG. 5,

Figure 9

5 shows a plan view of the tube of FIG. 5 with the four wall fields lying opposite one another,

Figure 10

a broken and enlarged individual view of a corner at the end of the tube, where two adjacent wall panels form a diagonal gap,

Figure 11

10 along the line XI-XI of FIG. 10, namely as a vertical section, if the packing tubes according to FIGS. 1, 2, 5 and 6 are taken upright so that their side walls lie in vertical planes,

Figure 12

broken off schematically a vertical cross-sectional view of the plastic-encapsulated tube end edge with wall field in the diagonal gap, and

Figure 13

a lid.

The finished package for flowable materials is not shown in any of the drawings because similar packages are known, albeit without the wall sections explained below. For a clearer illustration of the invention, a tube 1 is used here a liquid pack, which is square in cross section. After folding over its four vertical fold lines, the resulting flat side walls 3, 4, 5 and 6 are connected to one another along a longitudinal sealing seam 2 by heat sealing. This results in the cuboid tube 1 shown in perspective in FIGS. 1, 5 and 6 with its upper, cover-side end.

The tube is closed with the cover 7, as shown in FIG. 13. The cover wall, generally designated 17, consists of an opening tab 19 attached to a hinge 18, which is connected to the cover wall 17 via an endless line of weakness 20. The outer surface of the cover 7 lies in a first outer plane 21, while the surface in which the line of weakness 20 lies defines an inner second plane 22. The pouring device has a grip tab 23 which is arranged perpendicular to the plane 21 or the second plane 22 below it. The grip tab 23 is formed from pulling and connecting eyes 24, a filler skin 25 and a gripping opening 26.

The foot of the grip tab 23 is integrally formed on the flat wall 27 of the opening tab 19, an edge 28 projecting outwards to form a closure support.

The opening tab 19 is elongated if one were to look down from above in FIG. A collar 29 protrudes downward from the flat wall 27 of the opening tab 19, which collars at an angle outwards and upwards, as shown at 31. An outer lower part 30 forms the narrower end, and stiffening ribs 32 allow a thin configuration of both the upper wall 27 and the lower wall 33. Finally, 34 at the front in extension of the lower wall 33 denotes the pouring edge of the pouring opening.

What is special about the tube 1 shown broken off with its upper part according to FIGS. 1, 2, 5 and 6 are opposite wall panels 8, 9 (FIGS. 1 to 3) or additionally also the other opposite wall panels 8 ', 9' (Figures 5 to 7 and 9).

In the embodiment according to FIGS. 1 to 3, wall panels 9 and 8 are shown attached along the folded edges 11 'and 11 only on the opposite side walls 3 and 5, while the tube 1 with its side walls 4 and 6 has edges 16 on the cover side. At the edges 10 of the two opposite wall panels 8 and 9 facing the center of the lid 7, the part protruding downward from the upper lid wall 27 engages around the wall panel 8, as shown in FIG. 13 at the broken left end. Similarly, the construction can be formed at the opposite end. However, if the pouring opening 17 is placed in a corner of the package, e.g. is shown as a recess facing the viewer in FIG. 6, then another attachment to the side walls 3 and 4 is provided under the pouring edge 34 in a manner known per se.

The side walls 3 to 6 of the tube 1 are thus extended on the cover side and extended with at least two opposite wall parts 8 and 9 (FIGS. 1 to 3) which are at an angle α of preferably approximately 90 ° to the adjacent side wall 5, 3 along the lines 11, 11 'stand out folded. In the other embodiment according to FIGS. 5 to 7 and 9, the tube 1 is provided on all four side walls 3 to 6 with wall panels 8, 8 ', 9, 9' and around the corresponding fold lines 11, 16 'and 11', 16 '' folded over. The wall panels 8, 8 ', 9, 9' have the shape of narrow tabs, because this saves material, particularly in the production of the blank. The same also applies to packs which are round in cross section, in which, as not shown here, small triangular tabs take over the function of the wall panels.

In FIGS. 3 and 7, a carrier material web 12 coated with plastic is broken off and consists of two webs 13 and 14 and is guided, for example, in direction 15 through the processing machine. Approximately in the middle 35, the two tracks 13, 14 are cut in stages so separated from each other that only the hatched areas shown in FIGS. 3, 4, 7 and 8 arise as waste.

If one considers the cut production according to FIGS. 3 and 4 for the embodiment of a tube according to FIGS. 1 and 2, the stepped middle cut begins e.g. at point 36, runs upwards to point 37, from there on the right parallel to the conveying direction 15 at the outer end or the edge 10 of the wall panel 8 facing the cover and then down to the left edge of the parallelogram inclined to the point 38, thence along a line 10 ″ to the right to point 39 and at the same time to point 40, because this creates the parallelogram inclined to the right as a drop, in order to finally circulate around the next wall field 9 of the side wall 3; and to the right in the direction of arrow 15 in a corresponding manner. As a result, in the web 12 according to FIG. 3, a cut I after the other is formed with the wall panels 8 and 9, while at the same time corresponding wall panels are cut or punched through the cut on the opposite web 14. The individual blank I is separated from the next blank by separating the webs 13, 14 transversely to their running direction 15 at point 41. With one cut through both webs 13 and 14, two blanks are formed in each case. The bottom configuration and arrangement of the fold lines is not described here.

In Figure 4, one can see under a) the larger parallelogram-like waste pieces in the area of the later sealing seam 2, under b) the parallelogram-like waste pieces inclined to the left and under c) the parallelogram-like waste pieces inclined to the right, which give a negligible fraction of the material in relation to the overall web and therefore require an economical production.

The step cut according to the center 35 in the two tracks 13 and 14 of FIG. 7 is very similar but even simpler. It can be seen that the separating cut consists of a straight line at the height of the center 35 and the punched fields attached, which are hatched and have the shape of triangles or trapezoids with the respective narrower or pointed end down. In other words, the height of the wall panels 8, 9, 9 ', 8 is at the top of the web 13 as well as at the web 14 next following upwards, which results in the described straight section along the center 35. The trapezoidal waste pieces according to FIG. 8b are punched out in the area of the later longitudinal sealing seam 2, and wherever the longitudinal fold lines between the side walls 3 to 6 later run in the tube, the tips of the triangular waste pieces according to FIG. 8a lie.

If a cut is made from a web 12 according to FIG. 7 through the longitudinal and cross-sections and is folded and closed along the longitudinal sealing seam 2, the result is the embodiment of FIG. 5, the one according to FIG. 6 being only an additional special feature, namely the recess at the corner facing the viewer for a pouring opening.

While the injection of the cover 7 onto the tube 1 at the top in the embodiment of FIGS. 1 and 2 takes place on the one hand on the free edge 10 of the wall panel 8, 9 and the adjacent cover-side end edge 16, which is offset in stages, this is done in the other embodiment according to FIG. 5 along the free edges 10 of the four wall panels 8, 8 ', 9, 9' and along the diagonal gap 42.

This gap 42 is formed by the adjacent paper edges, of which only the edges 43 and 44 of the adjacent wall panels 9, 9 'are shown in FIGS. 6 and 9, for example. In the illustration in FIG. 10, these two paper edges 43, 44 coincide in the dashed line of the diagonal gap 42 (ideally). FIG. 7 shows a paper edge 43 between the two points 36 and 37 next to the triangular waste piece (FIG. 8a).

When the cover 7 is molded onto the free end edges 10 of the four tab-shaped wall panels 8, 8 ', 9, 9', it still flows liquid plastic in the space shown in FIG. 11 between the inner injection molded part 45 and the outer injection molded part 46, the cross-sectional view of which before the injection is taken here along the line XI-XI in FIG. 10. The resulting injection molding space is exaggerated to show in the representation of the result in cross section according to FIG. 12 how the plastic 47 is pressed into the diagonal gap 42 and runs both inside and outside a certain area and solidifies there. In this case, there is a sealing connection which solidifies the pack and also between the adjacent paper edges 43 and 44 in the diagonal gap 42. In the plan view, FIG. 10 shows the cover 7 at the top, its plastic up to the line 48, 49, 50 and then further down on the left 51 runs, with the entire area being covered in the diagonal gap 42, as can also be seen from the top right in FIG. 12, and the wall panels 9 and 8 'are covered by about half, because the dashed lines 10 represent the paper edge or more precisely that the edge 10 of the respective wall panel 8, 8 ', 9, 9' facing the center of the cover 7.

From the illustration in FIGS. 10 to 12 in particular, it can be seen how, when the cover is molded on in the tube embodiment with the four tab-like wall panels 8, 8 ', 9, 9', the plastic 47 not only flows into the diagonal gap 42 and thereby the adjacent paper edges 43 and 44 of the adjoining tab-like wall panels 9, 9 ', but also extends in all other three spatial directions, so that in the plan view of FIG. 10 it exceeds the limits of the diagonal gap 42 so far that it only lines 48, 49th , 50, 51 stops flowing, ie solidified along these boundary lines.

Claims (7)

1. A package for flowable substances, particularly milk and juices, with a cross-sectionally tetrangular tube (1) comprising four flat side walls (3-6) connected to one another by a longitudinal sealing seam (2) and consisting of a synthetic plastics coated carrier material such as paper or cardboard and with a synthetic plastics top which is integrally moulded onto the end of the tube (1), the tube (1) being at its top (7) and on at least two at least partially oppositely disposed edges (11, 11') extended by respective wall panels (8, 9; 8', 9') projecting at an angle (α) to the side walls (3, 5), the top (7) being integrally moulded onto the respective edge (10) which faces the centre at the top (7) which is furthermore integrally moulded onto that edge of the tube (1) which is not extended, characterised in that to the respective top end edge (11, 11') of two oppositely disposed side walls (3, 5; 4, 6) there is connected to the respective side wall (5, 3; 6, 4) via a fold line (11, 11'; 16', 16'') a wall panel (8, 9; 8', 9') in the form of a narrow tab
2. A package according to Claim 1, characterised in that on each top end edge (11, 11'; 16' , 16'') of the four side walls (3-6) a wall panel (8, 8'; 9, 9') in the form of a narrow tab is connected to the relevant side wall (5, 3, 6, 4) via a fold line (11, 11'; 16', 16'').
3. A package according to one of Claims 2, characterised in that the diagonal gap (42) between adjacent wall panels (8, 8'; 9, 9') of a cross-sectional rectangular package is in the plane of the top (7) filled with synthetic plastics material (47) which engages around the adjacent paper edges (43, 44) and extends at least partially in all three spatial directions beyond the boundaries (for example 43, 44) of the diagonal gap (42).
4. A method of producing a package for flowable substances, particularly milk and juices, with a cross-sectionally tetragonal tube (1) having flat side walls (3-6) connected to one another via a longitudinal sealing seam (2) and consisting of synthetic plastics coated carrier material such as paper or cardboard and with a synthetic plastics top (7) integrally moulded on the end of the tube (1), characterised in that a web of synthetic plastics coated carrier material (12) is cut through step-wise and lengthwise and substantially in the centre (35) and is shaped to form two webs (13, 14) which constitute the relevant tube (1) of the package, the stepped edge (10) of each web (13, 14) which results being provided as the top-end edge (10, 16) of the tube (1), the blank (I) of which is separated from the web (13, 14) by (at 41) parting the web (13, 14) from the web (13, 14) transversely to their direction of movement (15) , the blank being provided with a longitudinal sealing seam for formation of the tube and in that at the top end of the tube (1), as extensions of oppositely disposed side walls (3, 5) there are projecting wall panels (8, 9) which are folded over into the surface of the top (7), the top (7) being integrally moulded on the free edge (10) of the wall panel (8, 9) and the adjacent stepped end edge (10) and on the edges (16) of those side walls (4, 6) which are not extended.
5. A method of producing a package for flowable substances, particularly milk and juices, with a cross-sectionally tetragonal tube (1) comprising flat side walls (3-6) which are connected to one another by a longitudinal sealing seam (2) and consisting of synthetic plastics coated carrier material such as paper or cardboard and with a synthetic plastics top (7) integrally moulded on the end of the tube (1), characterised in that a synthetic plastics coated carrier material web (12) is cut through step-wisely and lengthwise substantially in the centre (35) and is shaped to form two webs (13, 14) which form the relevant tube (1) of the package, the cut (along 35) forming the bottom edge of a tube (web 14) or the parts of its folded bottom and the top-end edge (10) of the adjacent tube (from web 13), the blanks (I) of the relevant tube (1) being separated by parting (41) the web (13, 14) transversely to its direction of movement (15), the relevant blank (I) being provided with a longitudinal sealing seam to form the tube and in that four wall panels (8, 8', 9, 9') projecting at the top end of the tube (1) as extensions of oppositely disposed side walls (3-6) being folded over about fold lines (11, 11'; 16', 16") into the surface of the top (7), the top (7) being integrally moulded onto the free edge (10) of the wall panels (8, 9, 8', 9') and their adjacent stepped end edge (43, 44) as far as contact (11, 11'; 16', 16'').
6. A method according to Claim 4, characterised in that the stepped longitudinal cut (lengthwise of the centre 35) through the web (12) forms parallelogram-shaped waste portions (Fig. 4) of alternating slope.
7. A method according to Claim 5, characterised in that by the step-wise longitudinal cut (lengthwise of the centre 35) through the web (12) triangular (in Fig. 8a) and trapezoidal (in Fig. 8b) waste portions are formed.

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