HK47691A

HK47691A - Package for liquids

Info

Publication number: HK47691A
Application number: HK476/91A
Authority: HK
Inventors: Wilhelm Reil
Original assignee: Tetra Pak Holdings & Finance S.A.
Priority date: 1983-12-02
Filing date: 1991-06-20
Publication date: 1991-06-28
Also published as: AU580269B2; BR8406110A; AR245058A1; CA1273324A; SU1364231A3; ATE44699T1; EP0144736B1; EP0144736A2; JPS60134842A; ES291782U; SG46090G; MX161255A; DE3479023D1; DE3343629C2; DE3343629A1; ES291782Y; EP0144736A3; AU3531584A; ZA848774B; JPH0471778B2

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 liquid packaging consisting of side walls connected to each other by at least one longitudinal sealing thread in the form of tubes and attached at the ends of the tube, front walls forming a circular lid and a square bottom, the side walls being made of at least one side of plastic-coated cardboard, while the lid is made of thermoplastic plastic without support material and is attached to the sides along its outer edge, and having 2/3 of the transition lines in the tube, starting from the four corners of the floor, which are arranged in a transition line from the floor to the height of the tube, over 1/3 of the length of the tube.

For the transport of fluids, particularly liquids such as milk and fruit juices, parallel-piped packages are currently available, consisting of a tube of plastic-coated carrier material at both ends, closed at the front walls by cross-sectional closures and in a parallel-piped shape, so that two opposite triangular double-walled valves are formed at each front wall, protruding outwards from the front walls of the pack and finally folding against adjacent side walls or the front walls of the pack.

The liquid packaging described in the European document EP-A-052 261 is known to be of the type described above, although it has transition lines of shape to make a smooth transition from the square bottom to the round lid. The transition lines are also advantageous because they provide a rounding of the material in the manufacturing process by means of a stamp in the cross section, with the result that the material can be pulled apart transversely to such a rounded shape (straight line), with the material being treated like a spring. The transition lines of shape also allow for an accumulation of material around these lines, which results in a very rapid accumulation of material in these lines without emitting any fuel.

GB-A-1 243 812 also describes an ice-cup with a square bottom and a round opening at the top, which consists of a section with two wall panels connected together along a line of folding. This folding line also extends over the entire height of the ice-cup from the bottom to the top edge, but would be omitted by the professional if another section were used to make the cup, such as one made of one piece without the symmetrical division into two walls as described there. On the opposite side of this adjacent edge, the package has an adhesive layer corresponding to the longitudinal seal joint for the purpose of the present invention. The latter known package has not been covered by a flat bottom and is therefore particularly dense and is therefore manufacturable.

The present invention is therefore based on the task of creating, by simple means without additional material use, an even firmer, more stable package which is easier to grasp by the user.

The invention is based on the fact that in opposite areas of the tube, long fold lines extending over the entire height of the tube and parallel to its centre axis are provided, passing through the tips of two triangular flaps placed opposite each other, resulting from the folding of the floor with a cross-seam.

The long fold lines facilitate the formation of the tube, because the spine, using the measures of the invention, does not necessarily have to be circular in cross-section but can also be oval or at least fairly flat at the edges, which gives manufacturing advantages, but the shape of the rounded tube (over the longitudinal sealing joint) is still achievable because the long fold lines are located on the areas of the dome with great curvature and allow a perfect wrap.

The two long lines of folding are diametrically opposite each other and preferably arranged between two lines of folding for the transition of the shape. This symmetrical arrangement facilitates the production, and even a nearly flat sheet can be used as a thorn in the formation of the tube.

Apart from the advantageous production of the liquid packaging according to the invention in a cross section with the triangular flaps opposite each other, the elasticity resulting from the long folding lines on both sides extends over the entire material area up to the tips of the triangular flaps.

In the case of a more advantageous design of the invention, the longitudinal sealing joint is placed between two transition fold lines and at a distance from the long fold lines.

The following description of a preferred embodiment in conjunction with the drawings shows further advantages, features and applications of the present invention: Figure 1 shows the closed, ready-to-use package with the round lid on top,Figure 2 also shows the same package but with the bottom up, with the bottom and invisible lid positioned below pressed in such a way that no part of the opening device protrudes from the bottom edge of the lid over the overall contour of the package,Figure 3 shows the view of a cross section,Figure 4 shows an embodiment of the floor as in Figure 2 but with the triangular flaps folded inwards and Figure 5 a similar representation as in Figure 2, but with the longitudinal seam folded inwards as in Figure 4 and the opening doors not folded inwards as in Figure 2 but folded inwards and attached to the sides.

The finished packaging for liquid filling products shown in Figures 1 and 2 consists of a total of 1 sidewalls, with the front part of the packaging being separated from the 1a side-field in Figure 3 on the right and in Figures 4 and 5. In the area of the lid 2 the packaging has a round cross section, as the lid 2 is also circular in the upper part. On the front side forming the floor 3 the four side-walls cannot be distinguished because the cross section is there. The side-section 1 is shaped into a tube and is connected along the loop 4 to form the final loop of the closed tube.

The tube in Figure 2 has a height H, which, taking into account the forming before the floor 3 is completed, is of course smaller than the total height of the section in Figure 3 from bottom to top.

The bottom of the finished package is formed by this line 7, as shown in Figures 2 and 3. The different folding or pre-folding lines, which are not specified in detail, form the double-bottomed form of the double-bottomed strips 8 (Figures 3 to 5), in which the cross-seam 9 is placed, which is hardly visible in Figure 2 and indicated by a dashed short line in Figures 3 to 5, and which also forms the triangular flaps 10. After the double-bottomed strips 8 have been joined and the cross-seam 9 has been applied, the ground-mounted forehead (floor 3) is brought to the condition shown in Figure 4, where the triangular flaps with the outermost 10 or 21 points are placed on the ground (Figure 3 to 5) and the ground-mounted flaps are placed on the sides (Figure 3) and the ground-mounted flaps are placed on the sides (Figure 3).

This closure on the side of the floor 3 occurs after the packaging is filled. The lid 2 is already liquid-tightly sealed before filling. It can either be prefabricated, pulled from the bearing and sealed to the round tube or injected directly into the round end of the tube. Unlike the square floor 3, the lid 2 is made of only thermoplastic plastic and without support material: the injection of the lid takes the form of the use case in which the opening direction is folded outwards as shown in Figure 1. This facilitates the opening process during use.

The casing is generally designated 13 and is folded after injection or sealing before the package is turned to the condition shown in Figure 2 so that no parts of the casing 13 protrude from the outer edge 6 to ensure perfect stability and good repackaging (by shrink film or the like).

The outlet 13 is located in the centre of the lid 2 in the form of an outward-pointing, upward-pointing ring collar 14 as shown in Figure 1, the upper edge of which 15 is connected to a closing plug 16 with a welded gripper ring 17. The upper edge 6 of the lid 2 is practically just a ring which is sealed or injected into the top of the tube on the side opposite the lower edge 5 shown in Figure 3. Next to a weakening line not shown in detail is a connection point 23 (Figure 1) of the gripper ring 17.

In the case of the packaging shown in the figures, the so-called long folding lines 18 are diametrically opposite in tube 1 and extend over the entire height H of the tube and parallel to its centre axis. The centre axis is not shown in the figures, but all the lines running from the bottom to the top of the packaging are parallel to it, in the case of the embodiment shown in particular the longitudinal sealing 4 in the area of height H. The long folding lines 18 are also between two transition folding lines 20, as shown at the left tip 21 in Figure 3 and in the same way at the right tip 21. These transition folding lines 20 extend from the four corners 19 of Figure 3 and extend over about half the width of the bottom of Figure 3, and it is clear that the two transition folding lines 21 also extend through the two spokes of the folding tube.

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The main advantage of the long fold lines 18 alone and in combination with the transition fold lines 20 is that they provide a grip for the user, since, taking into account the flow direction of the outlet after the opening device, these fold lines, especially the long fold lines 18, are located at the top of the user's grip area perpendicular to the flow direction of the outlet, which makes the new pack much more stable and gives the user a greater sense of safety and thus better control of the movements with the new pack.

Claims

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) characterised 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).

2. A pack according to claim 1 characterised in that the longitudinal sealing seam (4) is arranged between two shape-transition fold lines (20) and at a spacing from the long folding lines (18).