|1.||I. Twochamber liquid carton for noncarbonated, easily perishable beverages such as milk and its derivatives, fruit juices and fruit drinks, souses etc., generally shaped as a rectangular and covered inside with impermeable plastic foil allowed for contact with food, are characterised by two cells separated from each other with at least one divider.|
|2.||Twochamber liquid carton, according to restriction 1, characterised by the fact that each cell has got one separate pour spout. Twochamber liquid carton, according to restriction 2, characterised by the fact that it has got two cells 4. Twochamber liquid carton, according to restriction 1, characterised by the fact that it has got one divider made of plastic foil fused with internal walls.|
|3.||5 Twochamber liquid carton, according to restriction 1, characterised by the fact that the divider is an integral part of a carton sheet shaped into figure eight.|
|4.||6 Twochamber liquid carton, according to restriction 1, characterised by the fact that it constitutes at least two separate containers permanently joined together with the help of an external plastic cover.|
|5.||7 Twochamber liquid carton, according to restriction 1, characterised by the fact that the carton is a multilayer composite, the internal layer of which is made of impermeable material allowed for contact with food.|
Liquid cartons known so far, e. g. Tetra Pak or Combibloc, contain their contents in one cell. The drawback of big, one-cell liquid cartons, especially for beverages (fruit juices, fruit drinks, milk, milk drinks, yoghurt, cream, souses etc.). the viability of which after their opening is significantly limited in time due to biological processes, is the fact that if the content is not fully used, the freshness, taste and aroma values decrease.
Such liquid cartons are produced e. g. by shaping an appropriate7 special plastic sheet (carton) around an appropriate mould to get a rectangular. In this way, the plastic sheet makes a single cell.
According to the invention, a two-chamber liquid carton for non-carbonated beverages, especially beverages which easily get spoiled, such as milk and its derivatives, fruit juices and fruit drinks, souses etc., has got at least two cells separated from each other with a vertical divider. The package is generally shaped as a rectangular and lined inside with plastic foil made of impermeable material allowed for contact with food. Each of the cells has got a separate pour spout. The advantage is that, according to the invention, a liquid carton has got two cells.
A good point about a vertical divider is, that it is made of plastic foil connected with internal walls by a fuse. Possibly, the divider makes a part of an integral carton sheet shaped into figure eight. The advantage is that a liquid carton constitutes at least of two separate containers.
A carton is a multi-layer composite, the internal layer of which is made of impermeable material allowed for contact with food.
A liquid carton is closed in a traditional way, through fusing lower edges, and after filling the cells in, fusing the upper edges.
Thanks to the fact that the inside is divided vertically into two or more cells, it is possible to open only part of the package and leave the other cell (s) closed. In this way the drink left is still fresh, its taste and smell values remain unchanged like in a new untouched liquid carton.
The invention is demonstrated by the drawings, where fig. 1A, IB and IC present successive phases of producing a multi-cell package from example I Figure ID presents a top view of an appropriately shaped carton sheet from example 1, before it is fused. Figures 2A, 2B and 2C present successive phases of producing a multi-cell package from example II. Figure 2D presents a top view of an appropriately shaped carton sheet from example II before it is fused.
A twin-chamber liquid carton, according to the invention, is demonstrated by examples related to the attached figures.
EXAMPLE I In figure 1A a carton sheet 1, widely used in liquid carton manufacturing, is lined with plastic foil at one side and appropriately bent (broken lines). Carton bending enables appropriate positioning it when shaping and closing. A plastic band 2 (appropriately measured) is fused to the carton sheet 1 along one of its edges 4 at the side lined with plastic (the future inside of the container). Figure 1B shows a cartoon sheet 2 partly wound around mould a. The sheet is bent along the bending lines 5 which make carton edges. The one-side fused plastic band 2 is then wound and stretched around mould a, in such a way that the other edge of the plastic band 2 overlaps the carton sheet edge (future fuse line). In figure IC, mould b is shifted to mould c with a partially wound carton sheet 1. In this way a plastic band 2 is pressed down. In figure ID a carton sheet 1 is completely wound on mould a and b. The plastic foil band 2 is kept between mould a and b, creating an inside divider of the package. The carton sheet I wound in this way, is ready for fusing along its side edges 5. During the carton sheet I fusing, a loose edge of the plastic foil band 2 is fixed. Two cells of the package are created, together with the plastic foil divider separating them.
EXAMPLE II Appropriately prepared carton sheet 1 is shaped around two identical moulds a and b in such a way that part of the carton sheet 1 surface makes an internal divider separating the inside of a created rectangular package into two equal cells. Figure 2A shows carton sheet 1, which is perforated along the lines of required bends o. It enables an appropriate positioning of a carton sheet around a mould as well as an appropriate placement of the created divider during the processes of shaping and closing the package. Moreover, the carton sheet is two-sided lined with plastic foil, so that at least the inside was lined. (The carton sheet is covered with plastic foil, depending on the fact which of its sides will be an external surface and which an internal one.) A carton sheet prepared in this way is wound around mould a (figure 2B). Part of the surface of carton sheet 1 will become an internal divider separating the carton package into two cells. Part of carton sheet 1, making an integral divider, is two-side covered with plastic foil. Mould b is then shifted to mould a (with a partially wound carton sheet 1) (figure 2C). In this way part of carton sheet 1-a divider, is pressed to mould a (the direction of carton sheet bending around moulds a and b is marked with arrows. In figure 2D the carton sheet I is completely wound around moulds a and b.
In top view, the carton sheet is shaped into figure eight. The carton sheet 1 prepared in this way is ready for fusing along both side edges 5. After carton sheet 1 fusing. two cells of the package are created, together with a divider made by a part of carton sheet I EXAMPLE III A two-cell carton package is made by permanent connection of two one-cell packages. The connection of two packages, each containing a half of a whole package contents, could be done using various methods, e. g. gluing, fusing, winding with a plastic foil (shrinkable in high temperatures, plain or printed).
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