FI89343B - Aemne Foer en foerpackningsbehaollare - Google Patents

Abstract

A blank for forming a container by folding the blank along longitudinal folding lines (2) into tubular shape, sealing a sealing panel (P5) onto a sealing area of a side wall panel (P1) of the tube and then folding top and bottom wall poritons (3, 3a, 3b, 4, 4a, 4b) inwardly along transverse folding lines (5, 6, 7) has gaps or interruptions (8) of the transverse folding lines formed within said sealing panel (P5) and sealing area. When folding the overlapped and sealed sealing panel (P5) and side panel (P1), any leakage that might occur between the overlying portions of the tranverse folding lines (5, 6, 7) will not extend into said gaps (8), whereby the sealing conditions can be maintained.

Description

89343

PACKAGING BLANK BLANK

The present invention relates to a packaging container blank comprising two side edges made of a material made of a long web of roll material and two straight parallel side edge lines intersecting the two side edge lines. .

Packaging containers containing liquid foods, such as milk and juice, are brick-shaped or top-end containers, all of which are made of a web of material containing cardboard backing layers and outer liquid-tight plastic layers, or of a web of material further containing, for example, aluminum. So-called top-end packages are usually made one by one by means of a long laminated web of material on which text is printed, the sides of these packages being joined together by hot welding to form a cylindrical package with a base part into which the contents are packed and the top is finished and sealed.

As shown, after forming the bottom portion of the packaging container in the packaging machine using a material for a cylindrical packaging container provided with fold lines, the liquid contents are placed in the package and the upper lid portion is

It is an object of the present invention to solve this above-mentioned problem by providing a packaging container; a blank capable of removing said disadvantage, i.e. the occurrence of liquid leakage, from both of the above-mentioned overlapping folds in the side edge portions of the package:::.

2 89343

In the solution according to the present invention, a cardboard material coated on both surfaces with a thermoplastic material comprises two opposite side edge lines formed of a web of material provided with a repetitive pattern to maintain the width of the blank body, the blank comprising forming the top lid portion of the packaging container and the adjacent plates forming the bottom portion of the package container on the top and bottom sides of the four side wall panels separated by longitudinal fold lines intersecting the upper side fold line and the lower side fold line, respectively, and a closure, on the outside of the plate for the purpose and in addition when the longitudinal closing plate of the blank fitted with the side wall in a longitudinal or rack line and a fold line adjacent the outer side of the plate, and the opposite side wall plate of the blank is superimposed to form a cylindrical body, the side art line separating portions are formed between the respective side art lines so that at the intersection of the side edge and the three side art lines.

In the present packaging solution, when the top and bottom portions of the package are formed by the upper and lower fold lines after the longitudinal closure plate and the side edge portion on the opposite side of the side wall plate are superimposed to form an overlapping cylindrical body and said overlapping portion is heat welded, and between the intersections of the three side art lines, and thus no fold line occurs in both the inner and outer plates along the side edge of the overlapped portion, the inner and outer plates of said portion being folded in even and close contact with each other, improving contact between them by preventing tallow.

3 89343 a problem with conventional solutions, which involves bending both the inner and outer plates overlapping when parts of similar cross-sectional shape are overlapped, whereby close contact is not achieved (due to surface irregularities) and fluid leakage occurs.

An embodiment of the present solution will now be described with reference to the accompanying drawings, in which:

Figure 1 shows an illustrative relationship between a blank and a web of packaging material according to the present solution;

Figures 2 to 4 show perspective views of a part of the materials for the cylindrical packaging container, the whole packaging container and the lower end part thereof, respectively, this packaging container being formed using said blank.

The blank for the packaging container is formed from a longitudinal web of material (1) (usually formed in a roll) made of cardboard, both sides of which are coated with continuous strength materials. This web of material is formed in such a way that the two opposite side edge lines (11) and (12) are repeated in pattern, maintaining a constant width of the blank, the blanks being separated by two straight and parallel left ... and right side edge lines (9) and (10). Said blank is formed so as to comprise four side wall plates; (P1), (P2), (P3) and (P4) separated by parallel longitudinal fold lines (2), (2) and (2) .......... and: that the narrow longitudinal baffle (P5). The side edge line (10) is parallel to the longitudinal (right): _ · fold line (2) outside the side wall plate (P4).

The plates (3), (3a) and (3b) for forming the upper lid part of the packaging container are formed on the upper side of the four side wall plates (P1), (P2), (P3) and (P4) next to the upper side art lines (5), and the plates (4), (4a) and (4b) for forming the bottom of the packaging container: ... · are formed below said side wall plates, respectively, next to the lower side art lines (6), in addition to the closing plates (16), (16a) ....... .to form an upper closure portion on the outside of the upper cover side panels 4 next to the upper side art lines (7). In the upper part of the longitudinal closure panel (P5) shown in Fig. 2, when forming cylindrical packaging container materials, the longitudinal fold line (2) inwardly of the longitudinal closure plate (P5) is aligned with the side edge line (9) of the side wall plate in position.

The bottom part of the container is formed by folding a small triangular plate (4b) inside opposite main base plates (4) and (4) respectively in the lower part of the cylindrical packaging container material, said main base plates (4) and (4) being folded outwards and opposite to the large triangular plates (4a); which are folded inwards using the lower fold line (6) as a folding hinge.

The side edge is formed convex by the boundary line (15) on the outside of the main base plates (4) and (4), the side edge (12) of the triangular portion being formed inwardly concave by the boundary line (15 '), the center portions (17) and (17') being formed to the main base plates (4) and (4) between the two boundary lines (15) and (15 '). When forming the packaging container, the central part (17 ') on one side can be placed between the main base part and the triangular plate parts (4a) and (4b) opposite to each other.

In this way, the pair of central bottom portions (17) and (17 ') projecting from the inner boundary line (15') of the main base plate pair (4) and (4) overlap symmetrically in the center position of the bottom of the packaging container and thus the bottom closure is reinforced in a uniform manner (see Figure 4).

This structure makes it possible to form a base with a solid and complete sealing ability after it has been sealed. After filling the liquid contents, the top lid part is closed and formed such that a small triangular plate (3b) is placed to be folded inside opposite upper main plates (3) and (3) at the top of the cylindrical packaging container material (see Fig. 2), opposite large triangular plates (3a) and ( 3a) is correspondingly folded inwards using the upper side! 5 89343 fold lines (5) as hinge lines. In addition, using the top-side fold line (7), the opposing closure plates (16) and (16) are superimposed, welded together and closed to form a closed top flap portion, with small closure plates (16a) and (16a) interposed therebetween (see Figure 3). ).

When the packaging container (see Fig. 3) is formed of a cylindrical container material (see Fig. 2) in this way, the overlapped and welded portion of the longitudinal closure plate (P5) and the side edge portion of the opposite side wall plate (P1) are folded into three side fold lines (5), (6) and ( 7) in corresponding positions and said hot-welded and overlapped part and parts with folding lines (8), (8) and (8) ......... between the respective side folding lines (5), (6) and (7) combining the inner and outer plates adjacent the side edge (10) of the overlapped and welded portion to allow even and tight contact to be folded, thereby maintaining the state of tight contact satisfactorily without losing the sealing property.

As can be seen from the above description, according to the present solution, it is possible to improve the tight contact of the folded portion (longitudinal closure) of the hot-welded overlapping side edge portion of the container in the manufacture of liquid food packages, and thus to provide a blank for the container without said liquid leakage. .

The drawings show an embodiment according to the present solution, and in which Fig. 1 shows an uncoated package of a packaging container showing the relationship between the blank and the web of material; Fig. 2 shows a perspective view of the upper part of the tubular packaging container material formed from the blank of Fig. 1 and not yet folded; Fig. 3 shows a perspective view of a so-called top-end packaging container made of the blank of Fig. 1; and Fig. 4 shows a perspective view of the packaging container of Fig. 3 showing the internal shape of the bottom of the container.

Claims (2)

A blank for packaging containers made of cardboard, both of whose surfaces are coated with thermoplastic coating material, the container being formed of a plane (1) of cardboard formed by repeating two opposing edges (11) and (12) as a pattern wherein the width of the blank is retained unchanged and separated by two straight parallel side edges (9) and (10) perpendicular to the side edges (11) and (12), the container being provided with panels (3), (3a) and (3b) which joined together to form the upper lid portion of the packaging container and with adjacent panels (4), (4a) and (4b) joined together to form the bottom of the packaging container with the panels positioned on both the upper and lower surfaces of the four side panels ( Pi), (P2), (P3) and (P4), these panels being separated from each other by longitudinal fold lines (2), (2) and (2) .......... that cross with the upper transverse folding line (5) and in the corresponding manner ik caused by the lower transverse folding line (6) and of the blank being additionally provided with closure panels (16) and (16a) to form a closed flange portion extending from the upper lateral fold line (7) to the outer surface of the disc to form the upper lid , characterized in that when the longitudinal closure panel (P5) and the side panel (P1) located on the opposing surface are placed diagonally on each other to form a cylindrical body, the parts which break the lateral fold lines (8) are formed, (8) and (8). on the side of the longitudinal sealing panel (P5) and the three side fold lines (5), (6) and (7). A packing container blank, according to claim 1, characterized in that panels forming the bottom of the container are treated such that a panel pair forming the central bottom portion (17) and (17 ') is positioned adjacent the main bottom panels. (4) and (4) side portions positioned opposite each other during manufacture of the container are convex between two narrow parallel boundary lines (15) and (15 '), in that the lateral portions of the triangular panel portions (4a), (4b) and ( 4b) which, thanks to the main bottom panels (4) and (4), become concave, and that the central bottom panel (17 ') can be placed on one side between the triangular panel parts (4a) and (4b) and the main bottom panel at one side (4) in the manufacture of the container bottom. li