EP0144736A2 - Package for liquids - Google Patents

Abstract

1. A pack for liquids comprising side walls (1, 1a, 1b) which are connected together in a tubular configuration by way of at least one longitudinal sealing seam (4), and end walls which are disposed at the ends of the tube (1) and which form a cover (2) of round cross-section and a square bottom (3), wherein the side walls (1) are formed from card which is coated with plastics material at least on one side while the cover (2) comprises thermoplastic material without a backing material and is mounted along its outside edge (6) to the side walls (1) and wherein shape-transition fold lines (20) are provided in the tube, starting from the four corners (19) of the bottom (3) and being arranged to extend from the bottom (3) over one-third to two-thirds of the height of the tube in the direction of the cover (2) characterized in that provided in oppositely disposed regions in the tube are long folding lines (18) which extend over the entire height (H) of the tube and parallel to the central axis thereof and which extend through the tips (21) of two mutually oppositely disposed triangular flaps (10) which are formed by folding of the bottom (3) with a transverse sealing seam (9).

Description

The invention relates to a packaging for liquids, consisting of side walls connected to one another via at least one longitudinal sealing seam and attached to the ends of the tube, a cover with a round cross section and a square bottom end walls, the side walls being formed from cardboard coated at least on one side with plastic , while the lid is made of thermoplastic material without a carrier material and is attached along its outer edge to the side walls.

There are currently parallelepipedic packs for the transport of flow agents, in particular liquids, such as milk and fruit juices, which consist of a tube made of a carrier material coated on both sides, which is closed at its ends in the region of the end walls by cross-sealing ribs and brought into a parallelepiped shape, so that there are two opposite, double-walled triangular flaps on each end wall, which first protrude outward from the end walls of the pack and are finally folded over against the side walls or the end walls of the pack.

Because of the provision of pouring openings by means of perforation, holes covered by separate strips, etc., packaging has also been developed which has a round lid at one end of the tube and a quadrangular base at the other end (DE-OS 32 17 156.0).

The present invention has for its object, a simple means without additional material. to create more stable, stable and easier to grasp ^j pack, even if one end wall is round and the opposite is square.

This object is achieved in that in opposite areas in the tube, extending over the entire height of the tube and parallel to its central axis long folding lines are provided and that starting from the four corners of the bottom, _F ormübergangs folding lines are arranged in the tube, the Bottom over 1/3 to 2/3 of the height of the tube in the direction of the lid are arranged. The so-called long fold lines facilitate the formation of the tube, because the mandrel using the measures according to the invention does not necessarily have to have a circular cross-section but can also be oval or at least quite flat at the edges, so that there are manufacturing advantages, but still the shape of the all-round closed tube (via the longitudinal sealing seam) can be reached because the long fold lines on the areas of the mandrel come to lie with great curvature and allow perfect folding.

With regard to the shape transition fold lines, there is the additional advantage of a good shaped transition from the square to the round cross section of the pack. In the case of a so-called block bottom, which also results in the known pack, there on one side, fold lines always form in the corners of the square bottom, but these are so short and uncontrollable that a reliable design of the pack without such shape transition fold lines will not result. In the case of the parallelepipedic packs, fold lines run from the corners of the floor over the entire height of the pack anyway. However, if the end wall opposite the block bottom is round, as in some known packs, a shape transition folding line cannot be arranged in the known manner. If one completely dispenses with such lines, the spontaneous crease lines resulting from the folding can even run in the direction transverse to the general longitudinal axis of the packaging; if necessary, even with longitudinal components. In each Trap then results in an uncontrollable shape of the package with a correspondingly high risk of leaks.

For an inelastic material such as paper, the transition of a package from a round cross-section at one end to a square one at the other end cannot be made theoretically. Even assuming that paper is assumed to be somewhat stretchable or elastic, it is still difficult to make a good transition from round to square. The two types of fold lines, namely the long fold line described first and the shape transition fold lines additionally arranged at the corners of the bottom, work in a combinatorial manner, because they make the pack more elastic and facilitate a defined shape with a reliable transition of the cross section from square to round.

The shape transition folding lines also have the advantage that they produce a rounding of the material in cross-section during manufacture by means of an embossing stamp, with the result that the material can be pulled apart transversely to such a rounded embossing (straight line), the material like a spring works. Material is accumulated in the region of the embossed shape transition fold line which is rounded in cross section, as a result of which the material is shortened in the direction transverse to this embossed fold line, which allows an extension without damage to the material in the sense of the spring mentioned above.

When the cross-section of a package of the type described here changes from square at one end of the tube and round at the other end, the shortening or resilient expansion and elongation of the packaging material in the direction transverse to the shape transition folding line plays a special role, because this makes the inherently inelastic material better shaping and thus a controllable transition from square to round allowed.

It is expedient if, according to the invention, the two long fold lines are diametrically opposite one another and are preferably arranged between two shape transition fold lines. This symmetrical arrangement facilitates production, and an almost flat sheet can then be used as a mandrel when forming the tube. Due to the even spacing of the fold lines, the material is distributed evenly or the design can be changed in a uniform manner.

It is also advantageous according to the invention if the two long folding lines run through the tips of two triangular flaps arranged opposite one another, which result from the block bottom folding of the bottom with a transverse sealing seam. Apart from the inexpensive production with such a cut, the elasticity, which starts from the long fold line on both sides, has an effect over the entire material range up to the tips of the triangular lobes.

In an advantageous further embodiment of the invention, the longitudinal sealing seam is arranged between two shape transition folding lines and at a distance from the long folding lines. E.g. the longitudinal sealing seam can be arranged approximately in the middle between the pair of shape transition folding lines in such a way that the pair of long folding lines is arranged further out at a distance.

In the case of a short pack and / or in the case of a stiffer material, the shape-folding lines should be made somewhat longer, in which case the length of 2/3 of the height of the tube is preferred. l

• Figur 1 perspektivisch die verschlossene, gebrauchsfertige Packung mit dem runden Deckel oben,
• Figur 2 ebenfalls perspektivisch die gleiche Packung, jedoch mit dem Boden nach oben, wobei der hier unten angeordnete und nicht sichtbare Deckel so eingedrückt ist, daß keinerlei Teile der öffnungsvorrichtung über die untere Kante des Deckels über die Gesamtkontur der Packung herausstehen,
• Figur 3 die Draufsicht auf einen Zuschnitt,
• Figur 4 eine Ausführungsform des Bodens wie bei Figur 2, bevor jedoch die Dreiecklappen nach innen umgeklappt sind und
• Figur 5 eine ähnliche Darstellung wie bei Figur 2, wobei aber die Längssiegelnaht wie bei Figur 4 vorn liegt und die Dreiecklappen nicht nach innen wie bei Figur 2 sondern nach außen auf die Seitenwände herumgeklappt und dort angeheftet sind.

Further advantages, features and possible uses of the present invention result from the following description of a preferred exemplary embodiment in Ver binding with the drawings. Show it:

• FIG. 1 shows the sealed, ready-to-use pack with the round lid at the top,
• FIG. 2 likewise shows the same pack in perspective, but with the bottom facing upwards, the cover, which is arranged below and is not visible, pressed in such that no parts of the opening device protrude beyond the lower edge of the cover over the entire contour of the pack,
• FIG. 3 shows the top view of a blank,
• Figure 4 shows an embodiment of the bottom as in Figure 2, but before the triangular flaps are folded inwards and
• 5 shows a similar representation as in FIG. 2, but with the longitudinal sealing seam as in FIG. 4 at the front and the triangular flaps not being folded inwards as in FIG. 2 but outwards onto the side walls and attached there.

The finished pack for flowable filling goods shown in FIGS. 1 and 2 consists of a total of 1 side walls, a distinction being made between field 1b and side field 1a in FIG. 3 on the right and in FIGS. 4 and 5 at the front. In the area of the lid 2, the pack has a round cross section, because the lid 2 is also circular in plan view. On the end wall side forming the bottom 3, one cannot distinguish between the four side walls because the cross section is round there.

.The side walls 1 are formed into a tube and connected along the longitudinal sealing seam 4 for the final formation of the closed tube. From Figures 2, 4 and 5 it can be seen that the longitudinal sealing seam 4 in the bottom 3 he stretches. This also results from the blank shown in FIG. 3.

The tube has the height H in the shape of FIG. 2, which, taking into account the shaping before the completion of the base 3, is of course smaller than the total height of the blank of FIG. 3, measured from bottom to top. The height H of the tube is measured from the top edge 6 of the lid 2 to the fold line 7, i.e. to the level of the fully folded block base 3. The height between lines 5 and 7 according to FIG. 3 disappears.

The lower edge of the finished package results from this line 7, which can be seen in Figures 2 and 3. Due to the different and not specified folding or embossing lines, the double cardboard strip 8 (FIGS. 3 to 5) is formed in the block bottom forms known per se, in which the barely visible in FIG. 2 and in FIGS. 3 to 5 are shown there is a dashed short line indicated cross seal 9. The triangular lobes 10 are also formed here. After compression of the double _K artonstreifens 8 and attaching the transverse sealing seam 9 is made the bottom-side end wall (the bottom 3) to the state of Figure 4, after which the triangular flaps 10 to the outermost tips 21 on the base 3 (shown in FIG 2) or the side walls (according to FIG. 5) folded over there, for example: can be attached by spot heating.

This closing on the side of the bottom 3 takes place after the pack has been filled. The lid 2 is already sealed liquid-tight before filling. It can either be prefabricated, pulled from the warehouse and sealed to the round tube, or it can be molded directly onto the round end of the tube. In contrast to the square bottom 3, the cover 2 is constructed only from thermoplastic and without a carrier material. The cover is molded on in the form of the form of use in which the opening device is folded outwards as shown in FIG. 1. This facilitates the opening process when in use.

The pouring device is generally designated 13 and, after injection or sealing, is folded in before the package is turned over to the state of FIG. 2 so that no individual parts of the pouring device 13 protrude beyond the outer edge 6. This guarantees perfect stability and good packaging (using shrink wrap or the like).

The pouring device 13 sits in the center of the lid 2 in the form of an upwardly projecting ring collar 14 according to FIG. 1, the upper edge 15 of which is connected to a sealing plug 16 with a welded gripping ring 17. The upper edge 6 of the cover 2 is practically only a ring, which is sealed or molded onto the upper side of the tube on the side opposite the lower edge 5 in FIG. 3. In addition to a weakening line, not shown, there is a connection point 23 (FIG. 1) of the gripping ring 17.

In the packing shown in the figures, so-called long folding lines 18 are arranged diametrically opposite one another in the tube 1 and extend over the entire height H of the tube and parallel to its central axis. The central axis is not shown in the figures, but all the lines running from the bottom to the lid of the pack lie parallel to it, in the embodiment shown in particular also the longitudinal sealing seam 4 in the region of the height H. The long fold lines 18 also lie between two Form transition folding lines 20, as can be seen on the left tip 21 in FIG. 3 and in the same way on the right tip 21. These shape transition folding lines 20 start from the four corners 19 of the bottom 3 and extend over about half the tube height H, see FIG. 3. It can also be seen that the two long fold lines 18 extend through the tips 21 of the triangular flaps 10.

In another view, the longitudinal sealing seam 4 - if one considers FIGS. 4 and 5, for example - lies between the two adjacent shape transition folding lines 20, of which only the “short” line shown in FIGS. 4 and 5 is shown in the same, and in the same Distance from the long fold lines 18, of which only the line arranged at the front right is shown in FIGS. 4 and 5. The right edge 4 'of FIG. 3 lies in the course of the longitudinal sealing seam 4, so that the specified positional relationships of the short shape transition folding lines 20 to the long folding line 18 or to the longitudinal sealing seam 4 can also be seen.

The long fold lines 18 alone and in connection with the shape transition fold lines 20 have the essential advantage that they represent a stiffening of the handle for the user. If one takes into account the direction of flow of the pouring jet after opening the opening device, then these folding lines, in particular the long folding lines 18, lie at the top in the grip area of the user perpendicular to the direction of flow of the pouring jet. As a result, the new pack can be held much better, and the user has the feeling of greater security and therefore has better control over the movements with the new pack.

Claims (4)

1. Packaging for liquids, consisting of side walls (1, 1a, 1b) connected to one another via at least one longitudinal sealing seam (4) and attached to the ends of the tube (1), a cover (2) with a round cross section and a square bottom ( 3) forming end walls, the side walls (1) being formed from cardboard coated at least on one side with plastic, while the cover (2) consists of thermoplastic material without a backing material and is attached to the side walls (1) along its outer edge (6) characterized in that long folding lines (18) are provided in opposite areas in the tube, extending over the entire height (H) of the tube and parallel to its central axis, and that of the four Corners (19) of the bottom (3) starting, shape transition fold. Lines (20) are arranged in the tube, which are arranged running from the bottom (3) over 1/3 to 2/3 of the height of the tube in the direction of the cover (2). 2. Packaging according to claim 1, characterized in that the two long fold lines (18) are diametrically opposite one another and are preferably arranged between two shape transition fold lines (20). 3. Packaging according to claim 1 or 2, characterized in that the two long folding lines (18) through the tips (21) of two oppositely arranged triangular flaps (10) which result from the block bottom folding of the bottom (3) with transverse sealing seam (9) . 4. Packaging according to one of claims 1 to 3, characterized in that the longitudinal sealing seam (4) between two shape transition fold lines (20) and at a distance from the long fold lines (18) is arranged.

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