FR2811303A1 - Corrugated cardboard carton with increased resistance to vertical compression for packing food products has flaps on its end walls positioned at angle across corners of carton with additional sections fitting against its side walls - Google Patents

Abstract

The corrugated cardboard carton with increased resistance to vertical compression has flaps (36) on its end walls (26, 28) which are positioned at an angle across the corners of the carton. These angled flaps have additional sections (42) which fit against the side walls (18, 20) of the carton and may be glued to it. An Independent claim is included for a blank for folding into the carton.

Description

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  CORRUGATED BOX WITH HIGH RESISTANCE TO

  VERTICAL COMPRESSION AND FLAN FOR THE PRODUCTION OF

THIS CASE.

  The present invention relates to a box made of semi-rigid material, for example corrugated cardboard, having the particularity of having a high resistance to vertical compression (RCV) and being able to be easily laid flat after opening. Such a box is particularly suitable for packaging fragile products, such as

  food products, fresh or frozen.

  In corrugated cardboard packaging of this type, the RCV is obtained by reinforcing the vertical walls of the packaging, for example by lining them with rigid or semi-rigid plates. These plates can be formed either by independent pieces glued to the inner face of the side walls, or by flaps formed in one piece with the blank which is used to make the packaging. In the first case, the assembly of the box is long and complicated and in the second case, the blank has an irregular shape which can lead to the formation of falls

important cardboard.

  In addition, corrugated cardboard packaging of this type, if it has good RCV over the entire extent of their vertical walls, remains fragile

  vis-à-vis the shocks at their corners.

  In addition, the opening of such cases is not simple. For example, when the box has glued lid flaps at its upper part, it is not always easy to grasp the edges of the lid flaps to tear them off. In the case where the flaps are kept in the closed position by means of an adhesive strip, this must be either cut by means of a cutting instrument, which is a constraint since one does not always have such a handy instrument, be torn off, but in this case we do not always manage to

  grasp the end of the adhesive strip to tear it off.

  In addition, flattening such packages with a view to eliminating them in a reduced format requires lengthy tearing and cutting operations. The present invention aims to remedy all these drawbacks and therefore proposes a corrugated cardboard packaging having a large RCV, including in the corners, which opens without the aid of instruments and which, a

  once emptied, can be easily dismantled to be laid flat.

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  To obtain all these advantages, the invention provides a packaging case comprising a substantially rectangular bottom, two longitudinal walls and two transverse walls standing perpendicularly to the bottom, respectively along the longitudinal and transverse sides of the latter, each transverse wall being provided with two sections coming to be placed at an angle in the corners of the body, said sections themselves extending by reinforcing flaps which are applied and possibly glued on

  the inner face of the longitudinal walls.

  The box according to the invention is provided at its upper part with closing means constituted by two cover flaps which are articulated along the upper edge of the longitudinal walls and which are dimensioned so as to cover each at most half of the opening upper part of the body, each of said cover flaps extending at its ends by two fixing lugs which come

  apply to the outside of the transverse walls.

  The corrugated cardboard blank used to make the box according to the invention is preferably oriented so that its grooves are vertical in the transverse walls of the box and therefore also in the sides, in the reinforcement flaps and in the tabs of fixing, so that all these walls are load-bearing. In addition, thanks to their vertical grooves, the reinforcement flaps will give good RCV to the longitudinal walls, although on these

grooves are horizontal.

  According to another characteristic of the invention, in each corner of the body, the bottom wall, the longitudinal walls and the cover flaps have respective portions which protrude beyond the sides, so as to create in the corners of the case of the vertical outside rooms. These chambers constitute a shock-absorbing volume which protects the corners of the body against external shocks. These chambers are also used to ensure vertical air circulation between the boxes. This results in better conservation of

packaged products.

  According to the invention, the cover flaps are held in the closed position by gluing the fixing lugs to the transverse walls. In the case where the lid flaps together cover the entire surface of the upper opening of the box, it is possible to

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  also keep them in the closed position using an adhesive strip that overlaps the contiguous edges of the cover flaps and

mounting brackets.

  Advantageously, the ends of the adhesive strip are bonded respectively to two breakable plates precut in the bottom of the box and which can be detached from the bottom. Once the brochure

  detached, we use it to tear off the adhesive tape.

  According to the invention, the box can be flattened thanks to the following measures: - each reinforcing flap is articulated on the adjacent pan by a pre-cut line according to which the flap can be separated from the pan; - At the upper end of said pre-cut line is formed a notch which constitutes a starting point for breaking the reinforcing flap; - On each cover flap are formed two precut lines according to which the flap can be separated from the fixing lugs. To put the box flat after it has been emptied of its contents, the two longitudinal walls of the box and the reinforcing flaps which are glued to them are spread outwards, which breaks the four precut lines. by which the reinforcing flaps are connected to the panels, then they are spread on either side of the bottom. The transverse walls and the sides are then spread out to place them on either side of the bottom, crosswise with respect to the longitudinal walls. The invention also relates to a corrugated cardboard blank for the

creation of the cash register.

  The invention will now be described in detail with reference to the accompanying drawings in which: FIG. 1 represents a blank of corrugated cardboard from which a box according to a first embodiment of the invention is formed; Figure 2 is a perspective view of the box made with the blank of Figure 1, the box being shown before the closing of the cover flaps;

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  Figure 3 is a perspective view of the box in the closed state, and showing an adhesive strip which keeps the lid flaps closed; Figure 4 is a plan view showing several boxes according to the invention arranged in a checkerboard fashion; Figure 5 is a perspective view of a variant of the box of Figure 3; and FIG. 6 is a perspective view of another variant of the

  box according to the invention, with an independent cover.

  With reference to FIG. 1, a blank 10 of corrugated cardboard will be described which is used to make the box shown in FIG. 3. The blank is rectangular and its grooves 12 are oriented in the direction of its width. The blank has a bottom 14 of substantially rectangular shape and whose corners 16 are truncated at a certain angle. On the longitudinal sides 22, 24 of the bottom are articulated two rectangular longitudinal walls 18, 20 and on its transverse sides 30, 32 are articulated two transverse walls 26, 28, of the same height h as the

longitudinal walls.

  The blank admits a center of symmetry located in the center of the background. For

  do not overload the description, we will only describe below the elements

  which are attached to one of the transverse walls, for example the wall 26, and the elements which are attached to one of the longitudinal walls,

for example the wall 18.

  At each end of the transverse wall 26 are articulated by a fold line 34, parallel to the longitudinal fold lines 22, 24, a rectangular panel 36 of the same height as the transverse walls. The fold line 34 comes from the meeting point of the

  transverse fold line 30 and truncated corner 16.

  Following the pan 36 is articulated, by a pre-cut line 40 parallel to the fold line 34, a rectangular reinforcing flap 42 of the same height as the transverse walls and of width 1 substantially equal to half the length L of longitudinal walls. It will be noted that at the outer end of each of the precut lines 40, a notch 44 is formed which constitutes a primer for

  tear in the precut line.

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  On the longitudinal edge of each of the longitudinal walls 18 is articulated, by a fold line 46, a cover flap 48 with a surface substantially equal to half the surface of the bottom 14. The corners 50 of the cover flap adjoining the longitudinal wall 18 are truncated at the same angle as the corners 16 and have the same length as the latter. The total width a of the cover flap is

  substantially equal to half the total width A of the bottom.

  At the ends of the cover flap 48 are articulated, by fold lines 52, 54 situated substantially in the extension of the transverse fold lines 30, 32, rectangular fixing lugs 56, 58 of height equal to the height h of the walls of the body and of width b equal to half the width B of the walls

26, 28.

  Thanks to the geometry and the adopted dimensions, the blank 10 has a perfectly rectangular shape and generates very few drops. The falls include at each corner of the blank a narrow L-shaped band between the fixing lug 56 and the reinforcement flap

  adjoining 42, and between the latter and the adjacent longitudinal wall 18.

  On each cover flap 48 are marked two pre-cut lines 60, 62 according to which the flap can be separated from the fixing lugs 56, 58. Each pre-cut line starts from a point P of the edge of the cover flap, close to the fold line 52 of the adjacent bracket and terminates at the meeting point of the truncated corner

  and the fold line 46 of the cover flap.

  On the bottom 14, break-off plates 64, 66 are precut, adjoining the transverse fold lines 30, 32 and located in the middle

of these.

  We will now explain the method of mounting the body: we draw up the transverse walls 26, 28 perpendicular to the bottom 14 and fold the flaps 36 to place them at an angle above the bottom, in an internal position relative to the truncated corners 16. The reinforcing flaps 42 are then folded so as to bring them substantially in line with the longitudinal fold lines 22, 24. After that, the longitudinal walls 18, 20 are erected and glued to the flaps.

  enhancement. The body is then in the state shown in FIG. 2.

  After filling the box, rotate the two cover flaps 48 to close the upper opening of the box, then apply

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  and the fixing lugs 56, 58 are bonded to the transverse walls 26,

28 of the case.

  Instead of gluing the fixing lugs, an adhesive strip 68 can be used which is overlapped on the contiguous edges of the cover flaps and of the fixing lugs. The ends of the adhesive strip are folded under the bottom 14 and glued to the plates 64, 66. The box is then in its closed state, as shown in Figure 3. As shown in this figure, the box has cut sides 36 in its four corners and these sides are protected by projecting portions 70, 72 and 74 from the bottom 14, longitudinal walls and cover flaps 48. It thus forms in the corners of the body,

  externally with cut sides, vertical chambers 76.

  When several boxes 10 are arranged in a checkerboard pattern, the vertical chambers of each set of four adjacent boxes complement each other to form a chimney open at its two ends. As line 4 shows, the four truncated corners 50 of these boxes determine between them an opening 78 in the form of a diamond at the upper end of the chimney, and likewise the truncated corners 16 form between them an opening, not visible, at the lower end of the chimney. It is understood that if the boxes are stacked on a pallet in stacks of several units, the chimneys will extend without interruption over the entire height of the stacks and that it will thus be established at

  through the chimneys a circulation of fresh air.

  The truncated corners 16 and 50 have the other advantage of reducing the floor area of the body and allowing savings to be made.

  on the quantity of corrugated cardboard used.

  As shown in Figures 1 and 2, the grooves 12 of the corrugated cardboard are oriented parallel to the longitudinal fold lines 22, 24. As a result, the grooves will be vertical on the transverse walls, on the sides and on the reinforcing flaps and that all these walls will be load-bearing. The longitudinal walls 18, 20 do not

  are load-bearing, but they are reinforced by flaps 42 which are load-bearing.

  All the vertical walls of the body are therefore reinforced with respect to

vertical compression.

  To open the box, we start by detaching one of the plates 64 or 66 from the bottom 14. By means of this plate, pull on the adhesive strip 68 to peel it over its entire length. We

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  then tears off the cover flaps 48 by tearing them along the precut lines 60, 62. The fixing lugs 56, 58 remain

  glued to the transverse walls.

  After emptying the box of its contents, it is laid flat by exerting an outward pull on the longitudinal walls 18, and on the reinforcing flaps 42 which are glued to them. Under the tensile force, the precut lines 40 tear, aided in this by the presence of the incipient fractures 44. The longitudinal walls 18, 20 on which the flaps 42 are stuck, as well as the cover flaps 48 can then be spread out flat on either side of the bottom by pivoting around the fold lines 22, 24. Likewise, the transverse walls 26, 28 with the flanges 36 which are adjoining them are spread out flat on either side from the bottom, by pivoting around the fold lines 30, 32. This operation of flattening the box is

  simple, fast and done without using a sharp instrument.

  The embodiment of FIG. 5 differs from that of FIG. 3 only in that the cover flaps 48 have a width less than half the width A of the bottom. In the closed position, these flaps form two longitudinal sidewalks between which a central opening 80 is defined. The fixing lugs 58 have a width reduced accordingly. Such a case is suitable for

packaging of fresh products.

  The embodiment of Figure 6 includes a box in all

  identical point to that of FIG. 2 and an independent cover 82.

  This comprises a bottom plate 84 with an area equal to the surface of the bottom 14, two longitudinal adhesive strips 86, 88 and two transverse adhesive strips 90, 92 articulated respectively along

sides of the bottom plate.

  On the bottom plate is marked a pre-cut line 94 substantially U-shaped, the ends of which end in the middle of the lines 96, 98 by which the transverse gluing flaps 90, 92 are articulated on the bottom plate 84. From from this meeting point, said articulation lines become precut lines 100, 102. On the bottom plate is cut, in position adjacent to the central branch of the precut line 94, a

  recess 104 for the introduction of the hand.

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  The cover is placed on the box and its bonding strips 86, 88,, 92 are glued to the side walls of the box. To open the box, the part of the cover which is situated on the side of the concavity of line 94 is lifted, which causes this line to break as well as the two precut lines 100, 102 to break. It goes without saying that many detail changes can be

  made to the embodiments described above.

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Claims (13)

claims   1. Corrugated cardboard box with great resistance to vertical compression, characterized in that it comprises a substantially rectangular bottom (14), two longitudinal walls (18, 20) and two transverse walls (26, 28) standing perpendicularly by relative to the bottom, by folding respectively along the longitudinal (22, 24) and transverse (30, 32) sides of the bottom, each transverse wall being provided with two sides (36) placed at an angle in the corners of the body, said panels themselves extending by reinforcing flaps (42) which are applied and optionally glued to the inner face longitudinal walls.   2. Box according to claim 1, characterized in that it is provided at its upper end with closing means constituted by two cover flaps (48) which are articulated along the upper edge of the longitudinal walls (18, 20) and which are dimensioned so as to cover each at most half of the upper opening of the box, each of said cover flaps extending at its ends by two fixing lugs (56, 58) which are applied   on the outer face of the transverse walls (26, 28).   3. Box according to claim 1, characterized in that it is produced from a blank (10) of corrugated cardboard, the grooves (12) of which are oriented vertically in the transverse walls (26, 28) of the box and so also in the panels (36), in the reinforcement flaps   (42) and in the fixing lugs (56, 58).   4. Box according to one of claims 1 and 2, characterized in that   that in each corner of the body, the bottom (14), the longitudinal walls (18, 20) and the cover flaps (48) have respective portions (70, 72, 74) which project beyond the sides ( 36), so as to create vertical chambers in the corners of the body exterior (76).   5. Box according to one of claims 1, 2 and 4, characterized in   that the bottom (14) and the cover flaps (48) have truncated corners (16, 50), so that when several boxes are arranged in a checkerboard pattern, the truncated corners of each set of four adjacent boxes form between them a upper opening (78) and a lower opening which ensure vertical circulation 2811303   air from bottom to top through the chimneys defined by the   juxtaposition of said chambers (76).   6. Box according to one of claims 1 and 2, characterized in that   that the cover flaps (48) are held in the closed position by gluing the fixing lugs (56, 58) to the transverse walls (26, 28).   7. Box according to one of claims 1 and 2, characterized in that   that in the case where the lid flaps cover the entire surface of the upper opening of the box, and therefore have contiguous edges, they are kept closed by means of an adhesive strip (68) which overlaps the contiguous edges of the flaps cover (48) and legs fixing (58).   8. Box according to claim 7, characterized in that the ends of the adhesive strip (68) are respectively glued on two breakable plates (64, 66) precut in the bottom (14) of the box, in position adjacent to the transverse walls (26, 28) and   substantially mid-length of the latter.   9. Box according to one of the preceding claims, characterized in   what it can be flattened by the fact that: - each reinforcing flap (42) is articulated on the adjacent pan (36) by a pre-cut line (40) according to which the flap can be detached from the pan; - At the upper end of said pre-cut line is formed a notch (44) which constitutes an initiation of rupture of the reinforcing flap; - on each cover flap (48) are formed two precut lines (60, 62) according to which the flap can be separated from the tabs of fixation.   10. Box according to claim 2, characterized in that the cover flaps (48) have a width (a) less than half the transverse dimension (A) of the box, so that when they are closed, they only close two longitudinal zones of the upper opening of the box and leave a central opening (80) free between said zones.   11. Box according to claim 1, characterized in that it comprises an independent cover (82), comprising a rectangular bottom wall (84) with the same surface as the bottom (14) of the box and 11 2811303   four flaps (86, 88, 90, 92) intended to be glued to the walls sides of the body.   12. Box according to claim 10, characterized in that each of the cover flaps (48) has two pre-cut lines (60, 62) for detaching them from the fixing lugs. 13. Blank for making the case according to one of the   previous claims, characterized in that it consists of a   corrugated cardboard plate (10) of rectangular shape, such that small drops of cardboard are generated at the corners of the blank, each drop comprising at each corner of the blank a narrow L-shaped band comprised between a fixing lug (56) and the flap adjoining reinforcement (42),   and between it and the adjacent longitudinal wall (18).