WO1987002644A1

WO1987002644A1 - Package and method for packaging products with retractable sheets

Info

Publication number: WO1987002644A1
Application number: PCT/FR1986/000371
Authority: WO
Inventors: Henry Savoye
Original assignee: Henry Savoye
Priority date: 1985-10-31
Filing date: 1986-10-31
Publication date: 1987-05-07
Also published as: ATE41393T1; FR2589444B1; EP0225208B1; FR2589444A1; EP0225208A1; DE3662377D1; ES2008036B3

Abstract

The package comprises a bottom part (10) and two opposite walls (11, 12), as well as two retractable plastic sheets (17, 18) intended to cover the products (P) and to press the latter against the bottom part. In order to achieve highly resistant connections between the sheets and the package, two fixing elements such as wall flaps (13, 14) built-in panels, or walls of a built-in belt, are applied against the internal faces of the walls (11, 12), and edges (171, 181) of the sheets (17, 18) are encompassed respectively between the fixing elements (13, 14) and the internal faces of the walls (11, 12). The sheets are developed between the walls from said edges (171, 181) first towards the bottom part (10) and then surrounding the fixing elements (13, 14). The package may be a cardboard box or receptacle.

Description

Packaging and packaging method for products in shrink sheets

The present invention relates to a packaging, in particular cardboard, for overpacking products deposited on a bottom of the packaging, by two sheets of the shrinkable plastic type. The sheets are arranged inside the packaging, between two opposite walls of the latter, and cover all of the products placed in order to hold them against the bottom, following heat shrinking of the sheets.

The products thus packaged and overwrapped can be boxes, bottles, documents or any grouped objects, or any product, preconditioned or not, grouped or put together in the packaging. When several products are packaged in the same packaging, the batch of products can be homogeneous or heterogeneous.

According to French patent FR-B-2 426 620, first lateral edges of shrink sheets are bonded directly along regions adjacent to the junctions between the inner face of the bottom and the inner faces of two opposite walls of a cardboard box. According to a first variant, the first sheet borders are bonded to the bottom, and according to a second variant, the first sheet borders are bonded respectively to the internal faces of the two opposite walls in close proximity to the bottom. In all cases, the leaves are developed from the bottom, immediately moving away from the bottom, vertically thereof, so that second borders of the leaves overlap above the products. The external faces of the first edges of the sheets, not in contact with the products, are glued to the internal face of the bottom or to the internal faces of the opposite walls.

With such a packaging, it has been found that the resistance to tearing or shearing of the bonds of the plastic sheets inside the packaging is not sufficiently high when the packaging is subjected to impacts, drops or turnaround especially during handling and transport. Indeed, under these conditions, under the action of inertia and the weight of the products packaged, the connections of the sheets to the walls or to the bottom give way and thus release the products, contrary to the aim sought for such packaging consisting in pressing and immobilizing the products against the bottom. The main object of the present invention is to increase the resistance of the bonds of the sheets to the packaging.

To this end, a cardboard or similar material packaging comprising a bottom and two opposite walls, as well as two sheets of the retractable plastic type intended to cover products placed on the bottom, is characterized in that it comprises two fastening elements applied against internal faces of the walls and in that the sheets have first edges sandwiched respectively between the fastening elements and the internal faces of the walls and are developed between the walls. from the first edges, first towards the bottom, then bypassing the fixing elements.

Thanks to the clamping of the first edges of the sheets between the fastening elements and the internal faces of the walls and to the development of bends in the sheets, practically at 180 °, facing the bottom to bypass the fastening elements, the resistance to tearing and shearing of the sheets is considerably increased, and practically the connections of the sheets to the fastening elements applied against the walls of the package cannot fail. As will be seen below, the fastening elements can be upper flaps of the walls, added plates which may constitute parts of the walls, or lateral extensions of opposite second walls of the packaging. The packaging can be a simple support with two walls applied against the products, or an open or closed box, or even a tray.

Different connections on the one hand from the first sheet borders to the fixing elements, on the other hand from fixing elements to the rest of the packaging can be selected in order to further increase the resistance to tearing off the sheets, and / or to increase the stacking resistance of the packaging, and / or to reduce the consumption of cardboard and / or reduce the cost of packaging.

The invention also relates to a blank of cardboard or similar material, precut and grooved from which is formed a package according to the invention. The blank is characterized in that it comprises two sheets of the retractable plastic kind, having first borders fixed, preferably by gluing, stapling or the like, on or in portions separable or not from the rest of the blank, acting as elements of fixation. Such blanks can be supplied to a user and stored, when the user has only one packaging form former.

The method of manufacturing a package according to the invention mainly comprises fixing the first edges of the sheets on or in portions of a precut and grooved blank serving as fastening elements, applying the fastening elements against faces internal portions of the blank serving as opposite walls of the packaging so that the sheets are developed from the first edges in the direction of one or portions of the blank serving as the bottom of the packaging, and forming of the packing intervening after or before the fixing of the sheets and / or the application of the fixing elements.

Other advantages and characteristics of the invention will appear more clearly on reading the following description of several preferred embodiments of the invention with reference to the corresponding appended drawings in which:

- L a Fig.1 is a perspective view of a package with two walls and support base, having two fixing flaps;

- Fig.2 is a view similar to Fig.1, showing a package with stud fastening flaps cooperating with mortises in the vicinity of the bottom;

- Fig.3 is a view similar to Fog.1, showing a package with plates or an attached fixing belt;

- Fig.4 is a top view of a cardboard blank n from which is formed the package according to Fig.1; - Fig.5 is a perspective view of the packaging of the

Fig.1 during forming, before fixing the flaps; - Fig.6 is a perspective view of the packaging of Fig.1, before filling of products;

- Fig.7 is a view similar to Fig.6, of a package in which the first edges of shrinkable plastic sheets are embedded in the structure of the flaps;

- Fig.8 is a perspective view of an American box in which shrinkable plastic sheets are sandwiched between- upper flaps and walls of the box, according to the invention; - Fig.9 is a perspective view similar to Fig.8, showing a tray;

- Fig.10 is a perspective view of another tray in which shrinkable plastic sheets are sandwiched between reinforcing extensions of second walls and first walls; and

- Fig.11 is an exploded perspective view of an open box in which reported walls enclose with extensions of other walls. shrink plastic sheets. According to a first embodiment shown in Fig.l, a cardboard package 1 or other semi-rigid analogous material comprises a bottom 10 and two opposite walls 11 and 12 each provided with an upper fixing flap 13, 14. Each flap 13, 14 offers a transverse free edge 130, 140 parallel to the bottom. All these parts of the package 1 are assumed here to be rectangular, and more generally, reference is made hereinafter to packages having a general parailelepiped shape, although packages according to the invention may be polyhedral.

The top face, or so-called internal face, of the bottom 10 directly receives a load, consisting of a batch of products P, homogeneous or heterogeneous, such as small boxes. The flaps 13 and 14 extend in. tiallement the walls II and 12 before forming the package and are delimited with respect to them by upper creasing lines 15 and 16. parallel to the bottom and to the edges 130, 140, serving as fold lines for folding down by opposite pivotings of 180 towards the bottom, the flaps 13 and 14 against the internal faces opposite the walls 11 and 12. Prior to the pivoting operation, two sheets or strips of heat-shrinkable plastic film 17 and 18 have first transverse edges or edges 171 and 181 fixed, preferably by gluing, or by heat-sealing such as heat-bonding or heat-sealing, or by stapling, or another similar process, on the internal faces opposite the flaps 13 and 14, in the vicinity of the edges 130 and 140. The width of the sheets 17 and 18 is substantially equal to that of the flaps 13 and 14, and more generally, may be greater or less than the width of walls II and 12. The length of each sheet is approximately equal to the sum of the half-length of the bottom 10 and approximately twice the height of the flaps 13 and 14 so that two second transverse free edges 172 and 182 of the sheets 17 and 18 can overlap above the products P for a heat-shrinking operation.

Thus, after application of an internal face of the flap 13, 14 against the internal face of the respective wall 11, 12, the first edge 171, 172 of the sheet is sandwiched between these two internal faces, that is to say sandwiched between them, and held firmly against them by. fixing the flap 13, 14 to the wall 11, 12, for example by gluing, heat sealing, stapling, or other similar method. The longitudinal edges 174 and 134 of the sheets 17 and 18 then follow vertical paths, descending in the direction of the transverse edges 130 and 140 and from the bottom 10 from the first fixed transverse edges 171 and 181, elbows at 180 ° to circumvent the edges transverse 130 and 140 of the flaps 13 and 14, then paths directed towards. the top, vertical or substantially oblique depending on the shape of the products and in particular their height, and finally substantially horizontal paths substantially above the transverse perpendicular bisector of the bottom 10 where the edges 1 7 2 and 1 8 2 are superimposed. The bracing closes the borders! 71 and - 1 8 1 of the sheets between the flaps and the walls and the change in direction of the development of the sheets under the edges 180 and 140 thus increase the resistance to tearing off the sheets, in particular when the load constituted by the products P pushes the sheets 17 and 18 upwards following stresses, such as shocks to the packaging or overturning of the packaging.

According to the embodiment illustrated in FIG. 1, the height of the flaps 13 and 14 is less than that of the walls 11 and 12, and is chosen according to the size of the products so that the edges 130 and 140 of the folded flaps 13 and 14 from which the sheets 17 and 18 emerge upwards, are at a distance from the bottom 10 always less than the maximum height of the products, the products can then be pressed against the bottom during the heat shrinking operation of the sheets. This makes it possible to reduce the consumption of cardboard as well as that of heat-shrinkable film. However, the maximum height of the products can be lower or higher than that of the walls 11 and 12.

Still according to the embodiment illustrated in FIG. 1, the internal face of a flap 33, 14 can be fixed, for example by gluing, anchoring or the like, directly to the internal face of the corresponding wall 11, 12, above of the zone for fixing the corresponding sheet border 171, 181 to the internal face of the flap, without this sheet border itself being fixed to the internal face of the wall. According to another variant, the internal face of a flap 13, 14 is fixed opposite the corresponding wall 11, 12 is carried out by means of glue intended initially to fix the sheet border 171, 181 on the inside face of the flap and crossing the border to simultaneously glue the flap to the wall, or by simultaneously stapling the flap, the sheet border and the wall.

According to a variant shown diagrammatically in FIG. 2, the height of the flaps 13 and 14 is practically equal to that of the walls 11 and 12, which constitutes two true double walls of the packaging which increase the resistance to stacking and to compression of the packaging. The stacking resistance is further increased for corrugated cardboard packaging, when the cardboard grooves or corrugations in the walls 11 and 12 and the flaps 13 and 14 are arranged vertically, that is to say perpendicular to the bottom 10, as indicated by the double arrow F in Fig. 2. In particular, the edges 130 and 140 of the flaps can each offer one or two studs 132, 142 projecting downwards after forming and folding, which penetrate into two mortises 101 and 102 complementary to the tenons, formed in the bottom 10, in the vicinity of the bases of the walls 11 and 12, or formed on or above the creasing lines 110 and 120 of the walls 11 and 12. According to the embodiment illustrated in FIG. 2, the sheets 17 and 18 are, moreover, wedged between the edges 130 and 140 of the flaps 13 and 14 and the internal corners between the walls 11 and 12 and the bottom 10, and are possibly crossed by the tenons 132 and 142 which further improves the fixing and the tear resistance of the sheets.

According to yet another variant shown in FIG. 3, the cardboard blank 1a from which the packaging is produced, as will be seen below, has detachable flaps or does not have flaps 13 and 14. Thus the flaps 13 and 14 according to Fig.1 are replaced by two small cardboard plates 133 and 143, here rectangular, having a width substantially equal, preferably less, than that of the walls 11 and 12. The plates 133 and 144 are attached to the above the bottom parallel to and against the plots 11 and 1 2 and are connected to the edges of the sheets 171 and 181 and to the internal faces of the walls 11 and 12 respectively, in a manner analogous to the various connections described above or below. after for the flaps 13 and 14, so as to enclose with the walls 11 and 12 the edges of sheets 171 and 181. This variant reduces the amount of cardboard in the package compared to the previous variants.

To make the packaging 1, in particular according to FIG. 1, a flat blank of rectangular cardboard, la, pushed from a store of such cardboard blanks, is introduced at the entrance of a gluing machine, as shown in FIG. Fig. 4. The blank 1a offers four rectangular portions on either side of a central rectangle forming the bottom 10, to constitute the walls 11 and 12 and the flaps 14 and 15 separated respectively from the bottom by the creasing lines 110 and 120 and between them by the crease lines 15 and 16. However, when the fixing portions 14 and 15 of the blank are plates 133 and 143 shown in FIG. 3, the lines 15 and 16 are pre-cut lines to separate the portions 14 and 15 of the rest of the blank and thus constitute two separate fixing elements. According to process illustrated in FIG. 4, discontinuous lines of hot-melt adhesive 111, 121 and 131, 141, are deposited transversely on the top faces of the walls 11 and 12 and of the flaps 13 and 14 by nozzles of the gluing machine. Then at a station for cutting and laying sheets of plastic film which may be overlying a forming machine, one or two punches, or sliding jaws apply the first edges 171 and 181 of two heat shrinkable plastic films unwound from two rolls of movie. Euis a central punch or part of the aforementioned single punch engages the blank la in a die of a forming machine, or suitable pivotable pushers of a forming machine fold the blank, so that the walls 11 and 12 with their flaps 13 and 14 are erected perpendicular to the bottom 10, as shown in Fig.5. Pivoting pushers then fold the flaps 13 and 14 180 ° towards the inside of the packaging, against the walls 11 and 12 so that the internal faces of the flaps 13 and 14 and / or the internal faces of the edges 171 and 181 - which correspond to the internal faces of the sheets 17 and 18 intended to be in contact with the products P - are fixed against the internal faces of the walls 11 and 12. At this stage, preferably a film is cut to the desired length to constitute the sheets 17 and 18 which, preferably, have their major part released from the top of the bottom and distant towards the outside, as shown in FIG. 6, in order to allow manual or automatic laying of the products P on the bottom 10 to a filling station. In order not to hinder the subsequent filling operation, the external edges 172 and 182 of the sheets have external faces slightly fixed against the external faces of the walls 11 and 12 by means, for example, of small adhesive spots 112 and 122 previously deposited in same time as the lines of glue 111, 121, 131 and 141, or small tapes, preferably removable, double-sided adhesive, or the like. After depositing the products P on the bottom 10, the sheets 17 and 18 are folded over the products and the edges 172 and 182 overlap on the products so that the packaging thus formed enters a known shrinking oven to heat seal the second edges of sheet 172 and 182 and to heat shrink the sheets 17 and 18 against the products P and press these against the bottom 10. Preferably, the heat-shrinkable film used is a plastic polymer, such as polyethylene, polypropylene or polyalkylene, and is mono-oriented, although it can be bi-oriented, so that the sheets 17 and 18 offer a main direction of retraction above the products, longitudinal and perpendicular to the walls 11 and 12. The package 1 is thus ready for dispatch and can be, if desired, overpacked by introduction into a box with flaps of the American box type, or by styling with a semi-American box.

According to a variant of the preceding process, the pivoting and the application of the flaps 13 and 14 against the walls 11 and 12 can take place when the blank 1a is flat, before the forming operation consisting in straightening the walls. According to yet another variant of the preceding process, the packaging is first formed in a forming station where the walls 11 and 12 and the flaps 13 and 14 are erected vertically, as shown in FIG. 5, then the packaging at its erected walls glued at 111, 121, 131 and 141, receives film ends 131 and 132 from two film unwinders which are glued to the flaps, and at its flaps 13 and 14 folded down by 90 °; then the films are cut to release the two sheets falling into the package.

The process illustrated has only been presented by way of example, and other processes can be deduced therefrom, in particular by combining the different operating steps in different orders. In particular, the blank 1a with sheets 17 and 18 cut and fixed to the flaps 13 and 14, and optionally fixed to the underside and external faces of the walls 11 and 12, can be manufactured as is by a cardboard box, and introduced to the entrance of a user forming unit wishing to carry out the packaging. The prepared blank can offer flaps 13 and 14 fixed to the top and internal faces of the walls 11 and 12. Such a blank can also be a folded and flattened box or tray blank. According to another variant illustrated in FIG. 7, instead of the sheet edges 171 and 181 being housed between the internal faces opposite the walls 11 and 12 and the folded flaps 13 and 14, or small plates 133 and 143, the transverse edges 171 and 181 of the sheets 17 and 18 are embedded in the very structure of the flaps 13 and 14 respectively, during the manufacture of the cardboard blank 1a. Depending on the structure of the cardboard used, the edges of sheets 171 and 181 are trapped respectively between facing faces of two sheets of cardboard 135, 136 and 145, 146 for a duplex or single-sided cardboard, or between facing faces. one of two sheets of cardboard and a corrugated cardboard sheet for a double-sided or double double-sided corrugated cardboard, or between facing faces of any two cardboard sheets for a multi-sheet cardboard. In all cases, the internal face 135, 145 of the flap 13, 14 is always applied against the internal face of the corresponding wall 11, 12 and fixed thereto. Furthermore, it will be noted in FIG. 7, that the cardboard is a corrugated cardboard; although undulations are presented horizontally, these undulations are in practice and according to the invention oriented vertically, as indicated by the double arrow F in FIG. 2.

Other packages having wall, bottom and flap arrangements can be used to implement the invention. Some types of these packages are described below. These various packages are designated by respective numbers, and the different parts of each of these packages are designated by a number, the first digit of which designates the package itself and the following digit or digits of which are identical to those designating similar parts. of the packaging 1 shown in Fig. 1.

With reference to Fig. 8, a package 2 is a rectangular or cubic box, of the American box type, offering a bottom 20, two first parallel walls 21 and 22 and two second parallel walls 291 and 292. Two upper fixing flaps 23 and 24 extending the walls 21 and 22 and delimited therefrom by creasing lines are folded 180 ° inside the body 2 and against the internal faces of the faces 21 and 22 to enclose therewith edges 271 and 281 of two retractable plastic sheets 27 and 28 adapted to overlap and to be heat-shrunk above products P placed inside on the bottom 20. Incidentally, two second upper flaps 293 and 294 extending the second walls 291 and 292 and delimited therefrom by creasing lines can be provided to close the box and thus protect the products P. The flaps 293 and 294 are coated along a plane perpendicular to the walls of the body. The flaps 293 and 294 can be connected together for example by adhesive tape, or held coplanarly by wrapping the box. According to another variant, the second flaps 293 and 294 are replaced by a cover or cover having a central panel similar to the bottom and bordered or not with one, two, three or four flaps applied against respective walls 21, 22, 291 and 292 of the case.

Of course, the different variants of connections of the first sheet borders already described with reference in particular to Figs. 2, 3, 6 and 7 are applicable to the body 2, or other packages 3, 4 and 5 described below or deducted from those -this.

In particular for the variant of FIG. 3 applied to the body 2, the small added plates or strips 133 and 143 may be panels having lengths and heights respectively substantially equal, or equal and different, from those of walls 21 and 22 , or portions of an annular belt of rectangular section C, also called case, crown or tube, as shown in broken lines in Fig.3, applied against the internal faces of the four walls 21, 291, 22 and 292 of the box. The belt may have two opposite walls having heights different from those of the other two. The bottom 10 of the box can be constituted by a simple cardboard panel, or by two flaps, or by four flaps superimposed in a conventional manner. According to another variant when using a belt C, the bottom comes from a blank similar to the blank la, but devoid of end panels 13 and 14, and comprises one, two, three or four panels, such as 11 and 12, which can form walls of a box when these panels have a height greater than that of the belt as shown in FIG. 3, or which can form flaps of a lower cover of the packaging when these panels, as indicated in 503 and 504 in Fig. 11, have a height less than that of the belt indicated in C, 53 and 54 in the Fig. 11. For this use of the belt, the belt is first formed, the sheets are attached to the belt, and the cap is formed and applied to the belt containing the sheets. According to the embodiment shown in FIG. 9, a package 3 is a tray 3 having a bottom 30, two large parallel walls 31 and 32, two small parallel walls 391 and 392 having heights less than those of the large walls 31 and 32, and two fixing flaps 33 and 34. The flaps 33 and 34 are delimited by crease lines 35 and 36 defining upper edges of the walls 31 and 32 and are folded against the internal faces of the latter to enclose therewith. first transverse edges 371 and 381 of two retractable plastic sheets 37 and 38 developed between the large walls 31 and 32. According to another variant, the flaps 33 and 34 are replaced by flaps delimited by creasing lines defining bor-ds upper walls 391 and 392 and are folded against the internal faces thereof to enclose therewith the edges of two shrink plastic sheets. According to another variant of tray 4 shown in FIG. 10, first edges 471 and 481 of two retractable plastic sheets 47 and 48 are sandwiched between the internal faces of small walls 41 and 42 on the one hand, and external faces of pairs of lateral reinforcing extensions or overhangs 43 and 44 of high walls 491 and 492, on the other hand, the overhangs are folded perpendicular to the high walls towards the inside of the tray 4 and applied respectively against the longitudinal ends of the internal faces of the small walls. An analogous variant? the previous one consists of enclosing the first edges 471 and 481 of two sheets 47 and 48 between the internal faces of the high walls of a tray on the one hand, and the external faces of pairs of lateral extensions or reinforcements of reinforcement of the small walls , on the other hand, the overhangs being folded perpendicular to the small walls towards the inside of the tray and applied respectively against the longitudinal ends of the internal faces of the high walls. For these two variants, sheets 47 and 48 pass between the edges lower, such as 430 and 440, of the overhangs and the bottom, the overflows playing a function similar to the flaps of the previous embodiments with respect to the fixing of the first edges of the plastic sheets. According to another packaging embodiment 5 of the tray or crate type, shown in FIG. 11, two first opposite walls are each essentially constituted by a fixing panel 53, 54 completely separated from a cardboard blank constituting the rest of the packaging during the formation of the packaging. The cardboard blank has, after folding and forming, a bottom 50, two second parallel walls 591 and 592, two extensions, also called extreme overhangs or flaps, in isosceles trapezoid 503 and 504 of the bottom 50 erected perpendicular to the bottom between the walls 591 and 592, and two pairs of extreme trapezoidal extensions or overhangs 51 and 52 of the walls 591 and 592 erected vertically and perpendicularly to them and between them. First edges 571, 581 of two retractable plastic sheets 57 and 58 are fixed in the lower part of the external faces of the panels 53 and 54 not opposite and respectively opposite the internal faces of the extensions 503, 51 and 504, 52 The panels 53 and 54 are attached to the inside of the package 5, and the external faces of the panels 53 and 54 are then applied against the internal faces of the respective extensions. The sheets 57 and 58 emerge inside, from the packaging 5, after having passed under lower edges 530 and 540 of the panels 53 and 54 and above the bottom 50. When the height of the panels 53 and 54 is different from that of the walls 591 and 592, the package 5 constitutes a tray.

According to another variant of FIG. 11, as already said with reference to FIG. 3, the fastening panels 53 and 54 are those of a parallelepiped belt C. In this case, the overhangs 51 and 52 can be eliminated, and the height of the walls 591 and 592 may be less than that of the belt C. For example, the walls 591 and 592 have a height equal to that of the flaps 503 and 504 so as to form a lower cover 50 with four flaps 591, 592, 503 and 504 applicable against the external faces of the belt constituting the four walls of the package. As is known, each of the trays, or open cases, or similar packaging, shown in Figs. 9, 10 and 11, is capable of being capped by a cover having for example two side panels applied for example against small walls of tray. The central panel of the cover above the bottom may possibly be supported on entablatures extending by upper folding the large walls of the tray, and may have mortises cooperating with upper tenons of the large walls of the tray.

Claims

R E V E N D I C A T I O N S

1 - Cardboard or similar material packaging comprising a bottom (10) and two opposite walls (11, 12), as well as two sheets of the retractable plastic type (17, 18) intended to cover products (P) placed on the bottom, characterized in that it comprises two fixing elements (13, 14) applied against internal faces of the walls (11, 12) and in that the sheets (17, 18) have first edges (171, 181) enclosed respectively between the fastening elements (13, 14) and the internal faces of the walls (11, 12) and are developed between the walls from the first edges (171, 181), first towards the bottom (10), then bypassing the fixing elements (13, 14).

2 - Packaging according to claim 1, characterized in that the first sheet edges (171, 181) are fixed on faces of the fastening elements (13, 14) opposite the internal faces of the walls (11, 12).

3 - Packaging according to claim 2 2, characterized in that the first sheet borders (171, 181) are embedded in the structure (135, 136; 145, 146) of the fastening elements (13, 14). 4 - Packaging according to claim 1, characterized in that the first sheet borders (171, 181) are sandwiched between two sheets (135, 136; 145, 146), such as flat or corrugated cardboard sheets, composing the elements fixing (13, 14). 5 - Packaging according to any one of claims 1 to 4, characterized in that the fixing elements (13, 14) are fixed to the internal faces of the walls (11, 12), preferably by gluing (111, 121 and / or 131, 141), stapling or the like.

6 - Packaging according to any one of claims 1 to 5, characterized in that the fastening elements (13, 14) have edges (130, 140) bypassed by the sheets (17, 18) which are applied on the or fixed to the internal faces of the walls (11, 12), or applied to or fixed to the internal face of the bottom (10) supporting the products (P). 7 - Packaging according to any one of claims 1 to 6, characterized in that αυc the fastening elements (13, 14) have edges (130, 140) bypassed by the sheets (17, 18) which have tenons (132, 142) cooperating with mortises (101, 102) formed in the bottom (10), or in the walls (11 , 12) or at the junctions (110, 120) of the bottom and the walls. 8 - Packaging according to any one of claims 1 to 7, characterized in that the fastening elements (13, 14) are made of corrugated cardboard offering grooves (F) substantially perpendicular to the bottom (10).

9 - Packaging according to any one of claims 1 to 8, characterized in that the fastening elements are plates (133, 143) attached against the internal faces of the walls (11, 12).

10 - Packaging according to any one of claims 1 to 8, characterized in that the fastening elements are upper flaps (13, 14) extending the walls (11, 12) and folded 180 ° against the inner faces of walls.

11 - Packaging according to any one of claims 1 to 8, characterized in that the fastening elements are opposite panels (133, 143; 54, 55) of a belt (C) attached between the walls (11, 12; 503, 504), the belt preferably having a height different from that of the walls.

12 - Packaging according to any one of claims 1 to 1 1, characterized in that it comprises two second opposite walls (291, 292; 591, 592) to form an open box.

13 - Packaging according to claim 12, characterized in that it comprises two second upper flaps (293, 294) extending the second walls (291, 292), or a cap with or its ns flap, to close the packaging. 14 - Packaging according to any one of claims 1 to 11, characterized in that at 'it has two opposite second walls (391, 392; 591, 592) having a height different from that of the first aforementioned walls (31, 32; 503, 504) in order to constitute a tray (3; 5). 15 - Packaging according to any one of claims 1: 9, characterized in that it comprises two second oppied walls (491, 492) to constitute a box or a tray (4) and in that the fastening elements are pairs of lateral extensions (43, 44) of the second walls (491, 492), applied against the ends of the internal faces of the first walls (41, 42). 16 - Packaging according to any one of the claims

1 to 9 and 11, characterized in that it has two opposite second walls (591, 592), in that the aforementioned first walls are constituted in particular by pairs of lateral extensions (51, 52) of the second walls (591, 592) bent perpendicularly thereto, and in that the fastening elements are separate attached panels (53, 54) or walls of an attached belt (C) applied against the internal faces of pairs of extensions (51, 52) opposite.

17 - Packaging according to any one of claims 1 to 9 and 11, characterized in that it comprises two opposite second walls (591, 592), in that the first walls are constituted by two extensions or lateral flaps (503 , 504) from the bottom (50) folded perpendicularly thereto, with which said fixing elements (53, 54) enclose the first sheet edges (571, 581), and in that the fixing elements are panels separate inserts or walls of an attached belt (C) applied against the internal faces of the two extensions or flaps (503, 504) of the bottom.

18 - Blank of cardboard or similar material, precut and grooved, from which is formed a package according to any one of claims 1 to 17, characterized in that it comprises two sheets of the kind of shrinkable plastic, (17, 18 ) having first edges (171, 181) fixed, preferably by gluing, stapling or the like, on or in separable portions (133, 143) or not (13, 14) from the rest (10, 11, 12) of the blank (la), acting as binding elements.

19 - Law d. manufacture of a packaging according to any one of claims 1 to 17, characterized in that it mainly comprises a fixing of the first edges (171, 181) of the sheets (17, 18) on or in portions (13, 14) of a pre-cut and grooved blank (la) silent as fasteners, an application of the fasteners (13, 14) against internal faces of portions (11, 12) of the blank serving as opposite walls of the packaging (1) so that the sheets (17, 18) are developed from the first edges (17, 18) in a direction or portions of the blank (10) serving as the bottom of the packaging, and forming of the packaging occurring after or before the fixing of the sheet borders and / or the application of the fixing elements.

20 - A method according to claim 19, characterized in that, when the fixing elements (13, 14) are inseparable portions of the blank, the application of these consists in folding the fixing elements against the internal faces of the portions (11, 12) of the blank serving as opposite walls of the packaging.

21 - Method according to claim 19 or 20, characterized in that the fixing of the first edges (17, 18) consists of embedding said edges between two sheets, flat or wavy, in the structure of the fastening elements (13, 14) during the manufacture of these.

22 - Method according to claim 19 or 20, characterized in that the fastening elements (13, 14) are fixed to the walls (11, 12) by means of glue or staples preferably having served to fix the first edges of sheet (171, 181) on the fixing elements.

23 - Method according to any one of claims 19 to 22, characterized in that second free edges (172, 182) of the sheets are substantially fixed against the external faces of the walls (L1, 12), preferably in the vicinity ( 112, 122) from the bottom (10) and after the forming operation, with a view to placing the products (P) on the bottom.