ES2240196T3 - CARTON BOX CLOSURE STRUCTURE. - Google Patents

Abstract

An end closure structure for a tubular structure has lines of joinder with closure flaps that are disposed to minimize the deformable area of an end wall by creating a tight structure that is less prone to blousing or bulging. The length of top (22) and bottom (26) panels is less than the length of side panels (24). The side panels terminate in weakened lines of joinder (55) that are arced toward adjoining side flaps (25). Almond-shaped transition panels (60) further facilitate a snug, secure end closure that is not easily deformed by bulging or blousing.

Description

Cardboard box closure structure.

The present invention consists of dies, more particularly in dies that have a closing structure that improves the integrity and appearance of the cardboard.

It is important during the constitution of Closed packaging of items have a packaging that is reliable and that is not prone to an unexpected opening and not present maintenance issue A problem with type dies Tubular cargo by the known end or side is that the end structures become soft with stacking and during the maintenance of the packaging. It is particularly true when items like beverage boxes are packed in paperboard. One solution is to provide oblique corners. EP 0 patent 500 258 represents an example of a die having corners oblique.

Modern beverage boxes have so general components as a cover and as a base that have a diameter smaller than the body of the box. It means that there are normally a substantial space between the corners of the end structure of a cardboard box and caps and bottoms of the boxes. In addition the boxes in general are designed to stored telescopically when stacked on each other. Thus, when the box packaging is stacked on top of each other, the boxes tend to be placed as they can. This action decreases the total height of a cardboard box causing this made the end walls bend outwards This deformation in outer or domed arc is equally known by the name of kite.

The kite creates problems, since it can do abnormal compressions on the flaps forming the walls of the end of the cartons of the boxes causing the weakness in glued panels. A deformation of the cardboard kite type creates a bump that can cause problems or otherwise hinder maintenance. The present invention and their preferential achievements seek to solve or at least minimize the problems of the prior art.

One aspect of the present invention proposes a cardboard containing opposite upper and lower panels and panels opposite sides connected to each other to form a tubular structure, side flaps folded together to said side panels along first joining lines respective weak, main flaps connected in a way foldable to the mentioned top panel along second lines  respective weak junctions and secondary flaps connected to the mentioned lower panel along third joining lines respective weak. The first weak joining lines are extend each entirely along an end edge neighbor of the respective side panel and are curved towards the mentioned side flaps in which a length of at minus one of the above mentioned upper and lower panels is less than a distance between the vertices of the arcs of said side panels

According to an optional feature of this aspect of the present invention, the lengths of the upper panel and the lower panel are both longitudinally inferior to the distance between the vertices of the arches of the panels lateral.

According to another optional feature of this aspect of the present invention, the top panel and the panel Lower may have a substantially equal length.

According to the invention there is another characteristic optional of this aspect of the present invention, there may be also transition panels inclined towards the inside of the respective ends of the side panels each formed by the mentioned first weak lines of union and by a fourth weak junction line positioned inside with respect to a imaginary corner of the cardboard to affirm the cardboard Around the items.

Preferably, the fourth weak junction line is arched to define a shape transition panel ellipsoidal

In an embodiment category, a maintenance structure in which the fourth joint line weak is placed through a panel forming the structure of handle.

According to another optional feature of said aspect of the present invention, the or each side panel can be separated from its neighboring side flap by what (s) transition panel (s).

A second aspect of the present invention proposes a die to form a cardboard box, the die containing a first panel to form a top panel in the assembled cardboard foldably connected to a second panel to form a side panel in the assembled cardboard connected of folding form to a third panel forming a lower panel in the assembled cardboard foldably connected to a fourth panel to form another side panel in the assembled cardboard, flaps laterally connected foldably to those mentioned second and fourth panels along first weak joining lines respective, main flaps foldably connected to the mentioned first panel that serves as the top panel in the carton assembled along second weak joining lines respective, secondary flaps connected to the mentioned third panel that serves as the bottom panel in the cardboard assembled at along weak third lines of union. The first lines of weak unions extend all entirely along a neighboring end edge of the second and fourth panels respective and are arched towards said side flaps, in the which a length of at least one of those mentioned first and third panel is inferior in the sense of length to a distance between the vertices of the arcs mentioned Second and fourth panels.

Preferably, the lengths of said first upper panel and third panel are lower in the direction of the length at said distance between the vertices of the arcs of the mentioned second and fourth panels.

According to an optional feature of this aspect of the present invention, the first panel and said third panel are of a substantially equal length.

According to another optional feature of this aspect of the present invention, there may be otherwise here transition panels at the respective ends of the seconds and  fourth panels each formed by the first joining line weak and a fourth weak junction line positioned inside with respect to an imaginary corner of the assembled cardboard.

Preferably, the fourth weak junction line is arched to define a shape transition panel ellipsoidal In one of the realization categories, it is planned a handle forming structure in which the fourth line of weak junction is placed across in a panel forming the handle structure.

According to another optional feature of this aspect of the present invention, the or every second and fourth panel it is separated from its neighboring side flap by the mentioned panel of Transition.

Advantageously, the transition panels in Almond shape better facilitate a reliable end closure and well adjusted that it is not easy to deform by bulging or keg.

Embodiments of examples herein invention will now be described only by way of example in reference to accompanying designs in which:

Figure 1 is an isometric representation of a cardboard box having a closure structure according to the teachings of a preferred embodiment of the present invention.

Figure 2 represents a plan view of a die to form the cardboard box of Figure 1 and

Figure 3 represents an elevation view of the cardboard box of Figure 1 from one end thereof.

In all drawings, the same are used reference numbers to designate identical characteristics or analogous to the present invention.

We can generally refer simultaneously to Figure 1 and Figure 2 in all of the foregoing invention attached. A cardboard box 10 having a structure closing according to the teachings of the preferred embodiment of The present invention is represented in Figure 1. A die 12 suitable for forming the cardboard box 10 is represented in Figure 2. A tubular structure, represented in Figure 1, It is formed from the panels that for practical reasons reference, they are designated as the top panel 22, a first side wall 24, bottom panel 26 and a second wall lateral 20/28 joined together in an articulated way.

The designation of the orientation of said panels refers to the orientation of items such as C cans that are packed in the items, which is not a contradiction. As shown in Figure 1, the orientation vertical of a box C corresponds to the designation of the panels 22 and 26 as upper and lower panels, respectively and the designation of panels 24 and forked panel 20/28 in So much that side panels. Due to practical reasons in the explanation of the die 12, the panels that ensure the arrangement of the upper and lower panels in the cardboard assembled 10 are designated by 22 and 26 and can be considered as the first and third panels of the die. Side panel plus far away is represented in bifurcated form 20/28 but has no necessarily need to be formed in this way to put in practice the teachings of the present invention. Because reasons reference practices, the first side panel 24 of the die can be considered as the second panel and the side panel more Exterior can be considered as the fourth panel.

The orientation of each of the panels of the pair of side panels with respect to each other and each of the panels of the pair of upper and lower panels the one with with respect to the other, it is not consistent with the implementation of the teachings of the present invention. For example, the top panel 22 can be used as bottom panel 26 without discarding teachings of the present invention.

A plurality of flaps and structures of support form an end closure for the tubular structure. In this embodiment, the side flaps 25, 21/29 are connected to the respective ends of the side panels 24, 20/28 at along grooved, perforated or weakened joining lines otherwise 55. For practical reference reasons, these are designate as the first weak joining lines. All weak junction lines described herein may be grooved, perforated or otherwise weakened. The flaps main 23 are connected to the top panel (or first) at length of weak second joining lines 45. The flaps Secondary 27 are connected to the lower (or third) panel at along weak third lines 35.

The first weak junction lines 55 are arched towards the side flaps 25, 21/29. In the carton assembled, arched connecting lines 55 have the effect of convert the cardboard box 10 narrower at the ends in the sense of width (as shown in figure 3).

The length L2 or L3 (ie the distance between the second weak joining lines 35 or the third lines of weak junctions (45) of at least one of the upper panels and lower 26, 22 is less than the length L 1 (that is, the distance between the vertices of the first joining lines weak arched 55) so that they make a structure of more tight cardboard closure that is less subject to deformation by said kite.

It is because the lengths L2, L3 of the panels upper 22 and lower 26 are less than the distance L1 between the vertices of the side walls 24, 20/28 that the lines of fold 45, 35 of the main flaps 23 and secondary flaps 27, respectively, they are closer or even match the edges of the C cans or similar items that are packed: This allows the packaging to be more tightly formed initial with a surface of main and secondary flaps less free or attracted to the kite effect. Because of this, the side flaps 25, 21/29 are able to rest against the cans (C) when the main and secondary flaps 23, 27 are fit perfectly against the upper and lower parts of the boxes

In a category of accomplishments, the closing from the end of the cardboard box is made as adjusting even better with respect to the items contained in the carton placing a 50,60 transition panel between the side panels 24, 20/28 and the end walls of the cardboard box. Every transition panel 50, 60 is formed from a first weak junction line 55 and a fourth weak junction line 58. Preferably, the two lines are arched outwards. with respect to transition panels 50, 60, the fourth line weak junction 58 is arched towards the opposite end of the panel respective side. This allows end structures adhere even more closely to packed items (such as cans C). In the preferred embodiment, weak lines arched 55, 58 define an ellipse, the panels of transition / support having the ends that intersect at corners of the cardboard box. Transition panels thus provide a regular transition of the side panels to a narrower wall and end structure, represented by more detailed form in Figure 3.

The curvature of the joining lines 55, 58 forming the transition panel (or support) also joins the vertical stiffness of assembled cardboard. This rigidity is useful for provide a support that allows the adhesions of the different flaps to another end closure of the cardboard box. In the preferential embodiment, the vertex of each weak junction line 55 is positioned to match the body of the article of corner to its tangent with the side panel so that at least a part of the transition panel comes to rest against a part on the side of article C.

In these embodiments with a structure of handle H, comprising a handle band represented in Figure 2, the fourth weak junction line 58 is adapted to be positioned through, or through the band.

It will be recognized that address references used herein as "superior, vertex", "of base "," end "," side "," main "and "secondary" does not limit the respective panels to said orientation, but serve to simply distinguish those panels of each other. Any reference to link lines or articulated union cannot be interpreted as a reference only to a single fold line, it is considered that a articulated link may be formed from one or more of the following lines: A dashed line, a fragile line or a fold line, without deviating from the scope herein invention.

It should be understood that different modifications may be carried out within the scope of this invention, for example, the measurement and shape of the panels of transition and / or joining lines can be adjusted to fit items of different size and shape, or other structures of vertex or base closure that can be used. The paperboard It can fit more than one item in different assemblies.

Claims (14)

1. Cardboard box (10) containing opposite upper and lower panels (22, 26) and opposite side panels (24, 20, 28) connected to each other forming a tubular structure, side flaps (25, 21, 29) foldably connected to said side panels (24, 20, 28) along respective respective first weak lines (55), the main flaps (23) foldably connected to said upper panel (22) along of respective second weak joint lines (45) and secondary flaps (27) connected to said lower panel (26) along respective third weak joint lines (35), characterized in that the first weak joint lines (55) are they extend all entirely along a neighboring end edge of the respective side panel (24, 20, 28) and are arched towards said side flaps (25, 21, 29) and because a length (L2, L3) of at least one of the above mentioned panels and infe rior (22, 26) is less than a distance (L1) between the vertices of the arches of the mentioned side panels (24, 20, 28). 2. Cardboard box according to claim 1, in which the lengths (L2, L3) of said upper panels (22) and lower (26) are lower, in the sense of length, to said distance (L1) between the vertices of the arches of said panels lateral (24, 20, 28). 3. Cardboard box according to claim 1 or 2 wherein said upper panel (22) and said lower panel (26) They are of substantially equal length. 4. Cardboard box according to any one of the claims 1 to 3, further comprising transition panels inclined inwards (50, 60) to the respective ends of said side panels (24, 20, 28) each formed by the said first weak joining lines (55) and a fourth line of weak junction (58) positioned inside with respect to a imaginary corner of the cardboard box to affirm with it the cardboard around the items. 5. Cardboard box according to claim 4, in which the fourth weak junction line (58) is arched to define a transition panel (50, 60) ellipsoidal. 6. Cardboard box according to claim 4 or 5, containing a handle structure (H), the fourth line of weak junction (58) is placed across in a panel (20, 28) forming the handle structure (H). 7. Cardboard box according to any one of the claims 4 to 6, wherein he or each side panel (24, 20, 28) is separated from its neighboring side flap (25, 21, 29) by he or the mentioned transition panel (s) (50, 60). 8. Die (12) to form a cardboard box (10), the die (12) containing a first panel (22) to form an upper panel in the assembled cardboard foldably connected to a second panel (24) to form a side panel in the assembled cardboard foldably connected to a third panel (26) forming a bottom panel in the assembled cardboard foldedly attached to a fourth panel (20, 28) to form another side panel in the assembled cardboard, flaps sides (25, 21, 29) foldably connected to said second and fourth panels (24, 20, 28) along respective first weak joining lines (55), main flaps (23) foldably connected to the said first panel (22) serving as the upper panel in the cardboard assembled along respective second weak joining lines (45), secondary flaps (27) connected to said third panel (26) serving as the lower panel in the cardboard assembled along tert they were respective weak joining lines (35), characterized in that the first weak joining lines (55) all extend entirely along a neighboring end edge of the respective second and fourth panels (24, 20, 28) and are arc towards said side flaps (25, 21, 29), and in which a length (L2, L3) of at least one of said first and third panels (22, 26) is shorter, in the sense of length, to a distance (L1) between the vertices of the arcs of said second and fourth panels (24, 20, 28). 9. Die according to claim 8, wherein the lengths (L2, L3) of said first upper panel (22) and third panel (26) are inferior, in the sense of length, to the aforementioned distance (L1) between the vertices of the arcs of said second and fourth panels (24, 20, 28). 10. Die according to claim 8 or 9, in the which said first panel (22) and said third panel (26) are of substantially equal length. 11. Die according to any one of the claims 8 to 10, further containing the panels of transition (50, 60) at the respective ends of said second and fourth panels (24, 20, 28) each formed by the aforementioned first weak junction line (55) and a fourth weak junction line (58) positioned inside with respect to a corner Imaginary cardboard assembled. 12. Die according to claim 11, in the which the fourth weak junction line (58) is arched to define a transition panel (50, 60) ellipsoidal. 13. Die according to claim 11 or 12, containing a handle structure (H), the fourth being weak junction line placed across in a panel (20, 28) forming the handle structure (H). 14. Die according to any one of the claims 11 to 13, wherein the or every second and fourth panel (24, 20, 28) is separated from its neighboring side flap (25, 21, 29) by the mentioned transition panel (50, 60).