Packaging of compressible flexible articles, industrial packaging process using this method, and articles thus packaged

Abstract

The object of the invention is to provide a flexible, eco-compatible, resistant packaging bag intended in particular for the industrial packaging of diapers 3. To this end, the invention relates to a packaging bag (1) of diapers 3 consisting of a sleeve (4): - formed of a single piece, preferably of general rectangular shape, whose opposite longitudinal edges (5,6) are joined together (56); - open at one end (8); - closed at its opposite end by a folded base (7); - the open end (8) being connected to the base (7) by two face walls (11, 12) delimited by two longitudinal folds (9, 10) and two end edges (13, 14) which define this open end (8); - one (11) of these face walls (11, 12) comprising the opposite longitudinal edges (5, 6) of the sleeve (4), joined together. The invention also relates to a bundle (24) of bags (1). Another object of the invention is an industrial packaging method.Figure from the summary: Figure 1.

Description

Title of the invention: Packaging for compressible flexible articles, industrial packaging method using it, and articles thus packaged

[0001] The technical field of the invention is that of industrial packaging, in particular, of compressible soft articles, such as disposable sanitary diapers, in bags made of environmentally sound materials, for example paper bags, e.g. kraft paper or cardboard.

[0002] The present invention relates to packaging bags for these flexible compressible articles, both to empty bags and to bags full of flexible and compressible articles, arranged in one or more superimposed rows.

[0003] The invention also relates to bundles of these packaging bags.

[0004] The invention further relates to an industrial packaging method for compressible soft articles in these packaging bags. Technological background of the invention

[0005] Besides the fact that paper, kraft paper, cardboard are biodegradable, compostable and recyclable materials, and therefore eco-compatible, the compression of flexible articles in their packaging, in order to reduce the quantity of packaging materials, is also a positive factor for sustainable development.

[0006] However, the confinement of compacted flexible articles in paper or similar packaging imposes constraints in terms of mechanical resistance, particularly for industrial-scale packaging, for example at least 600 layers per minute, as well as for storage and transport.

[0007] It is also important that such paper packaging be designed for quick and easy industrial packaging, in terms of filling, sealing and sealing stability, as well as the compact shape of the packaging containing the compressed flexible articles. This shape retention allows the packaged flexible articles and the packaging to form a compact and solid unit, with a preserved appearance free from creases, tears, or perforations.

[0008] These paper packages must be resistant, on the one hand, to tearing under the effect of the expansion forces of the compressed flexible articles they contain, and, on the other hand, to the external stresses to which the package is likely to be exposed, such as water, humidity, heat, light, and shocks during handling. To achieve this, the layer or layers of paper that make up the outer layer of this type of packaging, for example, a bag, are traditionally chosen with a total basis weight of between 60 and 125 grams per square meter. Beyond the composition of the The bag's outer material and structure must contribute to the bag's mechanical resistance (tensile strength, rigidity, toughness, tear resistance).

[0009] Ease of opening the packaging is also a specification expected by consumers. In particular, it is desirable that this opening allow for the easy extraction of a packaged soft item without tearing or damaging the packaging, so that the remaining items remain protected. However, there is a technical difficulty in this regard related to cellulosic materials such as paper or similar materials, which have a tendency to tear along the orientation of the cellulosic fibers, in a random and unpredictable manner. Providing perforated lines of lesser resistance to guide the opening of the packaging by tearing is a delicate matter. Indeed, these lines of lesser resistance also have the disadvantage of weakening the packaging, risking premature breakage during storage, transport, and the various handling processes it undergoes from industrial packaging to the consumer.

[0010] Naturally, another characteristic sought for paper or similar packaging is that it be recyclable and biodegradable, in particular industrially and home compostable, and have good printing qualities on its outer surface, in order to make this packaging attractive to the consumer.

[0011] It would also be appropriate that the paper or similar material of this packaging be obtained from recycled materials and be easily recyclable after use.

[0012] The weight and cost of the packaging are also essential factors to be taken into consideration.

[0013] There is therefore a need for compressible, flexible packaging bags that meet the specifications outlined above. The bags required are made of a flexible material such as paper or a similar material. Cardboard, due to its rigidity, is preferably not among the paper-like materials considered. Objectives of the invention

[0014] In this context, the invention aims to satisfy at least one of the following objectives.

[0015] One objective of the invention is to provide a flexible, eco-friendly packaging bag, intended in particular for the industrial packaging of compressible flexible articles, preferably grouped in at least one layer, and capable of evolving between a flattened state and an inflated / expanded state suitable for the industrial packaging of these articles.

[0016] An objective of the invention is to provide a flexible, resistant packaging bag suitable for industrial-scale packaging of flexible and compressible articles, for example at a rate of at least 600 per minute.

[0017] One objective of the invention is to provide a flexible packaging bag, resistant to the tearing, for the purpose of handling, transport and storage.

[0018] An objective of the invention is to provide a flexible packaging bag for compressible soft articles, and resistant to bursting under the expansion pressure of the compressed articles.

[0019] An objective of the invention is to provide a flexible packaging bag, in particular for packaging compressed flexible articles, which is resistant to heat, light, humidity, water and shocks.

[0020] An objective of the invention is to provide a flexible packaging bag, in particular for packaging compressed flexible articles, which is easy to open and which offers easy access to the packaged articles after opening.

[0021] An objective of the invention is to provide a flexible packaging bag, in particular for packaging compressed flexible articles, which is made from a printable, recycled and recyclable material.

[0022] An objective of the invention is to provide a flexible packaging bag, in particular for packaging compressed flexible articles, which is lightweight and economical.

[0023] An objective of the invention is to provide a set of flexible packaging bags, as referred to in the objectives above, this set being intended to enable the supply of an industrial packaging line with these bags.

[0024] An objective of the invention is to provide a fast, efficient and economical industrial packaging process in flexible packaging bags, as referred to in the objectives above, of flexible articles, in particular compressible articles, preferably gathered on at least one row, these articles advantageously being hygienic diapers. Brief description of the invention

[0025] The invention satisfies at least one of the above objectives and relates to a packaging bag * intended in particular for the industrial packaging of compressible flexible articles, preferably gathered on at least one row (for example two or three rows); * capable of evolving between a flattened state and an expanded state suitable for the industrial packaging of these items; * consisting of a sheath - formed from a single piece, preferably of general rectangular shape, whose opposite longitudinal edges are joined together; - open at one of its ends ("open end"); - closed at its opposite end, by a folded bottom; - the open end being connected to the bottom by two face walls delimited by two longitudinal folds and two terminal edges which define this open end; - one of these facial walls comprising the opposite longitudinal edges of the sheath, joined together.

[0026] This front and longitudinal weld of the sheath and the folded bottom of the bag are features, among others, which contribute to the functional and structural quality of the bag.

[0027] This bag is ecological, economical, robust and perfectly compatible with high productivity industrial requirements.

[0028] Advantageously, near at least one of the terminal edges of the face walls of this bag, there is provided at least one element intended to cooperate with at least one assembly member of several bags together to form a bundle, this element being, preferably, an eyelet and the assembly member of bags into bundles being, preferably, a bobbin. This feature contributes to making the bag according to the invention a packaging specifically designed to package compressed flexible articles, in one or more rows, at industrial rates of several hundred bags per minute.

[0029] Preferably: * the folded bottom is included in an end band extending in line with the two front walls and separated from the latter by a transverse fold; * this end band has two facial panels which are extensions of the two facial walls of the sheath and which are delimited by this transverse fold and by two longitudinal folds which are extensions of the two longitudinal folds of the two facial walls and which are folded back towards the axis or the median longitudinal plane PLM of the sheath, so as to be substantially parallel and aligned with the transverse fold; * each folded longitudinal fold corresponds, in the unfolded and flat state, to the perpendicular bisector of an isosceles triangle whose sides of the same length are folds, so that the base comprises, in the unfolded and flat state, two isosceles triangles whose bases are opposite each other and whose principal vertices are each at the intersection of the transverse fold and one of the longitudinal folds of the two face walls and one of the longitudinal folds of the end band; * In the unfolded and flat state of the base, with the longitudinal folds folded towards the axis of the sheath, the areas of the base comprising the opposite vertices of the base of the 2 isosceles triangles, are folded towards the transverse fold along a fold parallel to this transverse fold, so as to form two external flaps fixed to the front panel of the base, by means of at least a part of their inner face.

[0030] The folding and assembly of the bag's base are the result of a unique and ingenious process, which is combined with the front and longitudinal welding of the sheath. The re The bag's resistance to stresses resulting from the expansion of the compressed items contained within it is thus significantly reinforced.

[0031] According to a remarkable feature of the invention, the base is symmetrical with respect to the median longitudinal plane and / or with respect to its transverse fold.

[0032] According to an advantageous embodiment of the invention, the joining of certain parts of the bag together is achieved by gluing and / or heat sealing.

[0033] Advantageously, the bag according to the invention is at least partly composed of a material having at least one of the following properties: biodegradable, recyclable, home compostable, bio-based, non-allergenic, this material being preferably made up in whole or in part of paper, for example kraft paper.

[0034] To facilitate the introduction of the compressed soft articles into the unfolded bag, it is provided, according to a successful embodiment of the invention, that at least a part of the internal surface of its face walls is slippery, that is to say, that it has a coefficient of dynamic friction with respect to these compressed soft articles, between 0.01 and 0.25, preferably between 0.05 and 0.25.

[0035] This property can be obtained by applying a suitable coating and / or by physical and / or chemical surface treatment of the internal surface of the face walls.

[0036] After the introduction of the compressed soft articles inside the unfolded bag on the industrial packaging line, the closure of the bag is made possible by the fact that the latter is designed to be able to be closed by joining (for example by gluing or heat sealing) the terminal edges of the face walls, over at least part of their length, preferably by providing a gusset at each end of this part of the length over which the terminal edges are joined together, this gusset advantageously being made up of a fold of the end part of each edge over itself, inner face to inner face, and fixing them in such a way as to fix the fold which forms a gusset.

[0037] The invention also relates to the bag in which compressed soft articles, preferably sanitary diapers, are packaged, preferably on at least one layer, for example on one, two or three superimposed layers, each comprising 10 to 30 compressed soft articles, such as sanitary diapers.

[0038] This closed bag containing the compressed articles, having undergone the industrial packaging operation, is free of any element intended to cooperate with at least one (e.g., two) assembly element of several bags together to form a bundle. This packaging operation includes, in fact, a step of removing the upper part of the bag, opposite the bottom, comprising one or more assembly elements.

[0039] According to another of its objects, the invention relates to a bundle of bags according to the invention, in a flattened state, before their unfolding for the packaging of compressed flexible articles. In this bundle, these bags are joined together using at least one, preferably two, assembly organ(s), advantageously a bobbin, cooperating with eyelets provided in at least one of the terminal edges of the face walls of the bag.

[0040] The invention also relates to an industrial packaging method for flexible articles, in particular compressible articles, preferably assembled in at least one row, these articles advantageously being hygienic diapers, * in which bags according to the invention are used, preferably assembled into at least one bundle, * and in which The bags are put in place one by one, if necessary, extracted one by one from the bundle(s) of bags, The bags are inflated one by one. The compressible soft items are grasped, preferably in at least one row, and then placed into the inflated bags. the terminal edges of the facial walls are then joined together, preferably by heat sealing; and, possibly, the upper fringe of the terminal borders of the facial walls is cut. Brief description of the drawings

[0041] Other features, details and advantages will become apparent upon reading the following detailed description of a preferred embodiment of the packaging bag according to the invention and upon analysis of the accompanying drawings, in which:

[0042] [Fig-1] shows three perspective views A, B, C of a bag according to the invention closed and containing compressed soft sanitary diapers.

[0043] [Fig.2] shows a top view of the bag of [Fig.1].

[0044] [Fig.3] shows a detailed view of the lower part of [Fig.2].

[0045] [Fig.4] shows a view of one of the front walls of the flattened bag according to the invention.

[0046] [Fig.5] shows a view of the other of the face walls of the bag according to the flattened invention.

[0047] [Fig.6] shows a detailed view of [Fig.5] showing the bottom of the flattened bag.

[0048] [Fig.7] shows a detailed view of [Fig.6] with the bottom of the bag flattened, detached and partially unfolded.

[0049] [Fig.8] shows a detailed view of [Fig.5] showing the bottom of the flattened bag to fully detached and unfolded, on one side.

[0050] [Fig.9] shows a view of [Fig.8] on the other side.

[0051] [Fig. 10] shows a view of a bundle of bags according to the invention. Detailed description

[0052] Figures 1 to 3 below illustrate an example of an embodiment of the packaging bag 1 according to the invention, closed and containing two superimposed rows 2 comprising Each contains twenty-two 3-layer hygienic compressible diapers. Figures 4 to 9 show the bag according to the invention, flattened and open at its upper end.

[0053] In the present description, the terms "top"; "bottom"; "upper"; "lower" are understood in relation to the bottom of the bag located at the bottom or in the lower part of the bag.

[0054] Bag (1)

[0055] The bag 1 consists of a sleeve 4 made of a cellulosic material that is recyclable, biodegradable, and in particular compostable at home and industrially. Preferably, it is made of kraft paper with a basis weight of, for example, 75 g / m². Beyond this example, the kraft paper used in the bag according to the invention could have a basis weight between 60 and 120 g / m². In this example, the inner surface of the kraft paper is coated with a biodegradable, heat-sealable latex-based coating, which gives it a sliding action to facilitate the insertion of the rows 2 of compressed layers 3. The coefficient of dynamic friction compared to the compressed flexible articles is, for example, 0.08.

[0056] These latexes are advantageously chosen from dispersions or emulsions of synthetic resins in water, the latter preferably being acrylic, vinyl, or styrene-butabiene resins.

[0057] This sleeve 4 is obtained from a single rectangular sheet of kraft paper. In this embodiment, the dimensions of this sheet are 600 mm x 832 mm. The two edges 5, 6, which correspond to the two opposing end regions along the widths of this initial rectangular sheet, are joined to each other by heat sealing or gluing, preferably heat-sealed, for example, using a latex adhesive coating applied to the inner face of the kraft paper by a suitable tool on the packaging line. The heat-sealing temperature is, for example, 180 °C + / -10 °C. These longitudinal edges 5, 6 form a seam 56.

[0058] The sheath 4, precursor of the bag 1, is closed at its lower end by a folded bottom 7, and its upper end forms an open end 8, as shown in figures 4 & 5.

[0059] In the flattened state shown in figures 4 to 7, the bag 1 resulting from the folding of the sheath 4 along two fold lines 9,10 parallel to the longitudinal edges 5,6, has two face walls 11,12, whose two upper terminal edges 13,14 delimit the open end 8.

[0060] The joint 56 is disposed on the face wall 11.

[0061] Two perforations forming eyelets 15, 16 are provided near the terminal edges 13, 14 of the sleeve 4, on either side of the joint 56. These eyelets 15, 16 are elements each intended to cooperate with an assembly member which may, for example, be a bobbin 25: see [Fig. 10]. It is thus possible to join in a bundle 24 ([Fig. 10]), a plurality of flattened bags 1. The supply of the packaging line for compressible soft articles, in this case diapers 3, in the bags according to the invention, can be efficiently ensured by means of these bundles 24 of flattened bags 1.

[0062] As shown in figures 8 & 9, the folded base 7 is produced from a lower end band 17 of the sheath 4 extending the two face walls 11,12, separated from the latter by a transverse fold 18 and delimited on the sides by longitudinal folds 13e, 14e which are extensions of the longitudinal folds 13,14 of the two face walls 11,12. The extensions of these two face walls 11,12 which form the lower end band 17, constitute the face panels 11, 12e of the latter.

[0063] On [Fig.6] which represents the bottom 7 folded, glued and flattened, while [Fig.7] shows the bottom 7 before the folding and final gluing of the last flaps designated by references 20,21, it appears that the folding allows each longitudinal fold 13e, 14e of the end strip 17 to be brought towards the axis or median longitudinal plane PLM of the sleeve 4, in a position where each of them 13e, 14e is, on the one hand, perpendicular to the longitudinal fold 13,14, respectively, of which it is the extension, and, on the other hand, parallel and aligned with the transverse fold 18. Furthermore, each longitudinal fold 13e, 14e of the end band 17 corresponds, in the unfolded and flat state of the base 7 ([Fig. 7]), to the perpendicular bisector of an isosceles triangle 19, 20, whose sides of equal length are folds 191, 192, 201, 202, formed when the longitudinal folds 13e, 14e were folded towards the center of the sheath 4. The base 7 thus comprises, in the unfolded and flat state of [Fig. 7], two isosceles triangles 19, 20, whose bases 193, 203 are opposite each other and whose principal vertices 194, 204 are each at the intersection, on the one hand, of the transverse fold 18 or of one of the longitudinal folds 13e, 14e of the end band. 17, and, on the other hand, from one of the longitudinal folds 13,14 of the two facial walls 11,12. In the folded, glued and flat base 7 shown in [Fig.6], where the longitudinal folds 13e, 14e are brought / folded towards the axis or median longitudinal plane PLM of the sheath 4, the areas 21,22 (or final flaps) of the base 7 comprising the opposite vertices 195,196,205,206 of the base 193,203 of the 2 isosceles triangles 19,20, are folded down towards the transverse fold 18 and the longitudinal folds 14e, 13e, along a fold parallel 207 to this transverse fold 18 and to these longitudinal folds 14e, 13e, so as to form two external final flaps fixed, by means of at least a part of their inner face, to the corresponding face 11, 12e of the base 7.

[0064] The folded-down areas (final flaps) 21, 22 of the bottom 7 are, at least in part, attached to their corresponding respective front panel 1, 12, for example by heat sealing or bonding, preferably heat-bonded, for example, using a re- Latex adhesive garment, applied to the inner surface of kraft paper by a suitable tool on the packaging line. The heat-sealing temperature is, for example, 180 °C + / -10 °C.

[0065] Zone 21 of the bottom 7 is folded down partially onto the facial pan 12th and partially onto the upper face of zone 22.

[0066] The background 7, whatever it may be: * folded, glued and flat shown on [Fig.6] with the longitudinal folds 13e, 14e brought towards the axis or median longitudinal plane PLM of the sheath 4 and the areas (final flaps) 21,22 of the bottom 7 folded over the facial panels lie,12e; * unfolded and flat shown on [Fig.7] with the longitudinal folds 13e, 14e brought towards the axis or median longitudinal plane PLM of the sheath 4 and the areas (final flaps) 21,22 of the bottom 7 not folded over the facial panels lie,12e; * or unfolded and flat shown on [Fig.8] or 9 with the longitudinal folds 13e, 14e not brought towards the axis or the median longitudinal plane PLM of the sheath 4 and the areas 21,22 (final flaps) of the bottom 7 not folded over the facial panels lie,12e; is symmetrical with respect to the median longitudinal plane PLM and with respect to its transverse fold 18.

[0067] Bundle (24)

[0068] [Fig. 10] shows a bundle 24 of flattened bags 1, gathered together by bobbins 25 inserted into the eyelets 15, 16 of the stacked bags 1. Each of these bobbins 25 comprises an axial tube 251, one end of which includes a flange 252 and the other end, two radial elastic tabs 253, which are bendable to allow the axial tube 251 to pass through the eyelets 15, 16 of the bags 1 and which, once returned to their resting position, hold the bags 1 stacked on top of the axial tube 251.

[0069] The packaging line is equipped with tools that allow the bags of the bundle 24 to be picked up one by one. To facilitate this operation, a pre-cutting line 26 is provided between the eyelets 15,16 and the two upper terminal edges 13,14.

[0070] As soon as the bags 1 are introduced onto the packaging line, in two superimposed rows 2 of 22 hygienic, disposable, and compressed layers 3, the lips 27, 28, along most of their length, are brought into contact with each other by their inner faces and then heat-sealed / glued, preferably heat-glued, for example, using a latex adhesive coating applied to the inner face of the kraft paper by a suitable tool on the packaging line. The heat-sealing temperature is, for example, 180 °C + / -10 °C.

[0071] As shown in Figures 1, 2 and 3, the lips 27 28, which extend from the edges 13, 14 of the flattened bag, which comes, for example, from bundle 24, are folded and glued together at their ends to form a gusset 29, 30 at each end. Each of these gussets comprises a fold 271, 281. This 29.30 gusset makes opening bag 1 easier.

[0072] The lips 27, 28 and the gussets 29, 30 for closing the bag 1 undergo a trimming operation on the packaging line. They are thus shown in Figures 1, 2 and 3, free of any eyelet or any element intended to cooperate with assembly components such as the reels 25 to form bundles 24 of flattened bags 1.

[0073] Process

[0074] The invention also relates to an industrial packaging method for flexible articles, in particular compressible articles, preferably assembled on at least one row 2, these articles being advantageously hygienic diapers 3.

[0075] Bags for use on an industrial packaging line are advantageously in bundles of 24, comprising sixty bags.

[0076] This continuous industrial packaging line is, for example, of the type designed, manufactured and marketed by the company VIRE.

[0077] The bags 1 are extracted one by one from the bundle or bundles 24 of bags 1, by a tool of the industrial packaging line, designed for this purpose and are conveyed on this line by a conveying means.

[0078] Another tool in this line allows the bags 1 to be inflated one by one. Using a gripping tool, the compressible soft items, e.g. diapers 3, are grasped, row 2, then introduced into an inflated bag 1. The terminal edges 13, 14 / lips 27, 28 of the face walls 11, 12 are joined together, preferably by heat sealing, for example, using a latex adhesive coating applied to the inner face of the kraft paper by a suitable tool on the packaging line. The heat sealing temperature is, for example, 180 °C + / -10 °C. A cutting tool then proceeds to trim the terminal edges 13,14 / lips 27,28 of the facial walls 11,12.

[0079] The bags 1 containing the diapers 3, closed and topped, are then collected to be packed into large volume containers. Figure references

[0080] Bag 1

[0081] Layer 2 of 3

[0082] Sheath 4

[0083] Longitudinal edges 5,6 of the sheath closure 4

[0084] Joint 56

[0085] Bottom 7 of bag 1

[0086] Opening end 8 of bag 1

[0087] Fold lines 9,10

[0088] Facade walls 11,12,

[0089] Upper terminal borders 13,14

[0090] Lower end band 17

[0091] Transverse fold 18

[0092] Longitudinal folds 13th, 14th (extensions of longitudinal folds 13,14)

[0093] Facial panels, 12th (extensions of facial walls 11,12)

[0094] Isosceles triangle 19,20,

[0095] Folds 191, 192, 201, 202 of isosceles triangle 19, 20

[0096] Bases 193,203 of the isosceles triangle 19,20

[0097] Principal vertices 194, 204 of the isosceles triangle 19,20

[0098] Median longitudinal plane PLM

[0099] Zones 21,22 of the background 7 comprising the opposite vertices 195,196,205,206 of the base 193,203 of the two isosceles triangles 19,20

[0100] Fold 207 of the folding / folding of zones 21,22 of the bottom 7

[0101] Bundle of 24 bags 1 in a flattened state,

[0102] Bobinette 25

[0103] Axial tube 251, flange 252 and elastic tabs 253 of the bobbin 25

[0104] Pre-cut line 26

[0105] Lips 27 28 of opening 8 of bag 1

[0106] Bellows 29.30

[0107] Folds 271, 281 of the bellows 29,30

Claims

Demands

1. Packaging bag (1) * intended in particular for the industrial packaging of compressible flexible articles (3), preferably gathered in at least one row (2); * capable of evolving between a flattened state and an expanded state suitable for the industrial packaging of these articles (3); * consisting of a sleeve (4) - formed in one piece, preferably of general rectangular shape, the opposite longitudinal edges (5,6) of which are joined together (56); - open at one of its ends (8); - closed at its opposite end, by a folded bottom (7); - the open end (8) being connected to the bottom (7) by two face walls (11,12) delimited by two longitudinal folds (9,10) and two terminal edges (13,14) which define this open end (8); - one (11) of these facial walls (11,12) comprising the opposite longitudinal tudinal edges (5,6) of the sheath (4), joined together.

2. Bag (1) according to claim 1, characterized in that near at least one of the terminal edges (13,14) of the face walls (11,12), there is provided at least one element (15,16) intended to cooperate with at least one assembly member (25) of several bags (1) together to form a bundle (24), this element being, preferably, an eyelet (15,16) and the assembly member of bags (1) into bundles (24) being, preferably, a bobbin (25).

3. Bag (1) according to claim 1 or 2, characterized in that * the folded bottom (7) is included in an end band (17) extending in line with the two face walls (11,12) and separated from the latter by a transverse fold (18); * this end band (17) has two face panels (11,12e) which are extensions of the two face walls (11,12) of the sleeve (4) and which are delimited by this transverse fold (18) and by two longitudinal folds (13e, 14e) which are extensions of the two longitudinal folds (13,14) of the two face walls (11,12) and which are folded / brought towards the median longitudinal axis / plane (PLM) of the sleeve (4), so as to be substantially parallel and aligned with the transverse fold (18); * each folded longitudinal fold (13th, 14th) corresponds, in the background (7) in the unfolded and flat state, at the perpendicular bisector of an isosceles triangle (19,20) whose sides of the same length are folds (191,192,201,202), so that the base (7) comprises, in the unfolded and flat state, these two isosceles triangles (19,20) whose bases (193,203) are opposite each other and whose principal vertices (194,204) are each at the intersection, on the one hand, of the transverse fold (18) or of one of the longitudinal folds (13e, 14e) of the end band (17), and, on the other hand, of one of the longitudinal folds (13,14) of the two face walls (11,12);* in the unfolded and flat state of the base (7), with the longitudinal folds (13th, 14th) brought / folded towards the median longitudinal axis / plane (PLM) of the sheath (4), the areas (21,22) of the base (7) comprising the opposite vertices (195,196,205,206) of the base of the two isosceles triangles (19,20), are folded back towards the transverse fold (18) according to a fold (207) parallel to this transverse fold (18), so as to form two external flaps (21,22) fixed, by means of at least a part of their inner face, to the corresponding face panel (11, 12th) of the base (7).;

4. Bag (1) of claim 3, characterized in that the bottom (7) is symmetrical with respect to the median longitudinal plane (PLM) and / or with respect to its transverse fold (18).

5. Bag (1) according to any one of the preceding claims, characterized in that the joining of certain parts of the bag (1) together is achieved by gluing and / or heat sealing.

6. Bag (1) at least one of the preceding claims, characterized in that it is at least partly composed of a material having at least one of the following properties: biodegradable, recyclable, home compostable, bio-based, non-allergenic, this material preferably being made up entirely or partly of paper.

7. Bag (1) at least one of the preceding claims, characterized in that it is designed to be able to be closed by joining the terminal edges (13,14) / lips (27,28) of the face walls (11,12), over at least part of their length, preferably by providing a gusset (29,30) at each end of this part of the length over which the terminal edges (13,14) lips (27,28) are joined together, this gusset (29,30) advantageously being made up of a fold (271,281) of the end part of each terminal edge (13,14) onto itself, inner face against inner face, and fixing them so as to form the fold (271,281) which forms a gusset (29,30).

8. Bag (1) according to at least one of the preceding claims in which compressible soft articles, preferably sanitary diapers (3), are packaged, preferably on at least one row (2).

9. Bag (1) according to claims 2, 7 and 8 characterized in that it is free from any element (15,16) intended to cooperate with at least one assembly element (25) of several bags (24) together to form a bundle (24).

10. Bundle (24) of bags according to at least one of claims 1 to 9 joined together using at least one, preferably two, joining element(s), advantageously a bobbin (25), cooperating with eyelets (15,16) provided in at least one of the terminal edges (13,14) of the face walls (11,12) of the bag (1).

11. Industrial packaging method for flexible articles (3), in particular compressible articles, preferably gathered in at least one row (2), these articles advantageously being sanitary diapers (3), * in which bags (1) are used, preferably assembled in at least one bundle (24), * and in which the bags (1) are used one by one, where appropriate, extracted one by one from the bundle(s) (24) of bags (1), the bags (1) are inflated one by one, the compressible flexible articles (3) are grasped, preferably in at least one row (2), then are introduced into the inflated bags (1), the terminal edges (13,14) of the face walls (11,12) are then joined together, preferably by heat sealing; and, optionally, the upper fringe of the terminal edges (13,14) of the face walls is cut.

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