FR2831145A1 - Manufacturing procedure for flexible bag for holding bulk products uses tube of material cut with lengthwise slits to make lifting loops - Google Patents

Abstract

Procedure for making a large supple bag consists of cutting a section of a flexible tube equivalent to twice the height of the bag to form a flat rectangle of a double thickness of material. Two or more pairs of lengthwise slits are cut through the double layer's median zone to make lifting loops, and the tube is then turned along a circular fold line to make a second tube, the base of which is closed at its ends to form the bottom of the bag. The procedure for making a large supple bag consists of cutting a section of a flexible tube equivalent to twice the height of the bag to form a flat rectangle (ABCD) of a double thickness of material. Two or more pairs of lengthwise slits (2) are cut through the double layer's median zone to make lifting loops, and the tube is then turned along a circular fold line to make a second tube, the base of which is closed at its ends to form the bottom of the bag. The bag can be made from a textile material with a laminated outer coating to reduce wear.

Description

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 METHOD FOR MANUFACTURING A FLEXIBLE CONTAINER FOR RECEIVING BULK PRODUCTS, AND CONTAINER THUS OBTAINED.

 The present invention relates to flexible containers intended to receive bulk products, and more particularly to large-capacity containers which it is common to designate under the names FIBC (Large Bulk Bulk Container) or in English FIBC (Flexible Intermediate Bulk) Container) or even more simply "Big Bag".

 The present invention relates to a method of manufacturing such containers, as well as the various containers obtained by the implementation of this method.

TECHNOLOGICAL BACKGROUND OF THE INVENTION
Large-capacity containers or bags are used for the transport and storage of bulk materials, the quantity of which can reach or even exceed one tonne.

 Empty, these bags can be folded, which is an advantage over rigid containers.

 Their manufacture from woven fabrics or plastic film is easy.

 These bags are generally made flat from a sheet or from a continuous tube of flexible material which is cut at regular intervals so as to produce identical blanks, the edges of which are then assembled, by gluing or sewing, to form a pocket.

 To allow the use of lifting devices (forklifts or cranes), these bags have loops or suspension handles, often attached to the sides of the bags, at the four upper corners.

 A bag of this type is, for example, described in European patent application EP 0.340. 622 published on November 8, 1989 on behalf of the company Unistrap Verpackung E. Huemer.

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 This last general characteristic is considered to be a weak point of this type of bag during lifting operations, its lower mechanical resistance at the level of the handles of the handles limiting the capacity of said bag to around 50% of its theoretical capacity.

 Simple manufacturing methods have therefore been proposed in order to create integrated lifting loops which do not have the drawbacks of the attached handles.

 It is well known in the neighboring technical field of the continuous production of small capacity plastic bags - such as those intended for supermarket customers to carry their purchases - to form such bags by transverse welds, at regular intervals, d 'a tubular blank moving flat, and form the handles by an appropriate periodic cutting of this blank. Depending on the shape of the cut, the bag will be more or less easy to open, close or carry, as indicated in the US patent US 6,159. 136 published December 12, 2000 on behalf of W. Bellas et al.

We also know in this area how to strengthen the handles by providing each side of the blank with a longitudinal reinforcing strip at the cutout, as shown in Swiss Patent CH 622,416 issued April 15
1981 on behalf of the company Suominen HS Amerplast.

 In the manufacture of bags for bulk products, cutting the blank is used to make different types of handles.

 British patent application GB 2,194. 770, published on March 16, 1986 in the name of the company Mulox Ibc, describes a container formed in particular by a piece of tubular woven material turned over on itself. A bottom is sewn on the edges of the fold to constitute the pocket. A plurality of longitudinal notches made at the fold allow access to a ring strap passed inside. This strap forms a single lifting loop that can be hooked to a single crane hook.

 European patent application EP 0.041. 586, published on December 16, 1981 on behalf of the company Norsk Hydro, discloses a flexible container for bulk material comprising a tubular double-walled bag. As in the case of the bag described in document GB 2.194. 770, this double wall is constituted by a blank

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 cylindrical turned on itself. Lifting loops, suitable in particular for handling by forklifts, are formed by making in the external wall of the bag at least two diametrically opposite longitudinal openings. The pocket is formed, not by an insert closing the tube in its lower part, but by sections cut from the blank itself and assembled together by overlapping.

 American patent US 4,584. 705, issued on April 22, 1986 in the name of E. Myklebust and others, shows that, if these sections are triangular, the bottom of the container takes the form of a hopper.

 However, the general shape of the containers obtained by inverting a portion of tube of flexible material described in patent documents GB 2,194. 770, EP 0.041. 586 and US 4,584. 705 is quite far from that of the composite container described in application EP 0.340. 622, where the suspension loops, the filler neck and the emptying hopper are perfectly individualized.

 It therefore appears from the state of the art, as described in the documents cited above, that methods for forming flexible containers from a tubular blank and integrated handles are known, but that To date, there is no manufacturing process leading to well-structured containers.

GENERAL DESCRIPTION OF THE INVENTION
The present invention therefore relates to a method of manufacturing a flexible container intended to receive bulk products as well as the various flexible containers obtained by the implementation of said method.

 More specifically, its first object is a method of the type comprising those of the following steps: a) a first step consisting in cutting flat a first tube of flexible material approximately of a length at least equal to twice the height of the container terminating in it to an elongated rectangular blank of this double-thickness material having first and second ends, b) a second step consisting in arranging in the middle zone

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 of the first tube at least two longitudinal cutouts of sufficient length to subsequently form at least two lifting loops, c) a third step consisting in forming a second tube having a double wall by axial reversal of the first tube on itself along a circular fold line, substantially median, so as to juxtapose the first end and the second end, said second end being situated outside the second tube, and d) a fourth step consisting in forming the bottom of the container by closing the second tube at the ends.

 An essential characteristic of the manufacturing method according to the invention is that the cuts are made in the double thickness and are arranged in pairs having a longitudinal and transverse symmetry, the two cuts of each of the pairs being at a short distance from one of the another so as to later delimit lifting loops of small width.

 According to a first conception of the process for manufacturing a flexible container intended to receive bulk products according to the invention, these cuts have the shape of isosceles triangles opposite two by two by their bases. The bases of the triangles are then parallel to the long sides of the blank and the vertices of these triangles are located on the transverse median of the latter.

 The angle at the top of each triangle-shaped cutout is determined based on the diameter of the filler neck and the height of the lifting loops of the future container.

 According to a second conception of the process for manufacturing a flexible container intended to receive bulk products according to the invention, these cutouts are thin slots.

 In this case, these slots are preferably located astride the transverse median of the blank. Alternatively, they are offset towards the second end of the blank relative to the transverse median of the latter.

 Advantageously, the second step of the method according to the invention also consists in cutting triangular notches in the first and second ends of the blank in the extension of the longitudinal axes of symmetry of the pairs of

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 cutouts, defining trapezoidal flaps in said first and second ends of the blank.

 Advantage will be taken of an intermediate step in the process for manufacturing a flexible container according to the invention consisting in: cutting a strip of flexible material of length approximately equal to the circumference of the first tube and of width approximately equal to the diameter of this first tube, - fold the strip in half lengthwise, so as to make the longitudinal edges coincide, - place a cord inside the fold.

 Preferably, the fourth step of the method according to the invention consists in assembling the edges of the trapezoidal flaps or in fixing the longitudinal edges of the strip with the ends of the blank.

 Very advantageously, the second step of the method according to the invention further consists in: - cutting the blank between each of the pairs of cuts along two segments of longitudinal lines and a segment of transverse line forming a U whose opening is located on the transverse midline of the blank and directed towards the second end.

 The height and the width of this U are respectively equal to the height and to the width of the face of the trough of the container in formation constituted by the flap thus released, and to - cut by symmetry the longitudinal edges of the L-shaped blank in order to prepare the formation of the other faces of the chute.

 In this case, an additional step of the method according to the invention consists in raising the flap corresponding to each of the faces of the chute and in attaching it to the others to constitute this chute.

 There will be a benefit in reinforcing the longitudinal fibers of the container passing between the cutouts of each pair, preferably thanks to a texture of the material constituting the blank at this location.

 Alternatively, the longitudinal fibers of the container passing between the cutouts of each of the pairs are reinforced, preferably thanks to a sewn strap.

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 Preferably, the material used by the method of manufacturing a flexible container according to the invention is a woven fabric having a lamination on one side. In this case, the inversion of the first tube is carried out in such a way that the lamination is inside the double wall of the second tube.

Very advantageously, the length of the first tube is approximately twice the height of the container in formation increased by a length sufficient to release the lifting loops, that is to say at least equal to the height of these loops, and preferably of an additional length to constitute the bottom of the container being formed.

In this method of manufacturing a flexible container, the number of pairs of cutouts is preferably equal to two, the longitudinal axis of symmetry of each of these pairs being at a distance from each of the longitudinal edges of the blank equal to 1 / 4 of the width thereof, thus preparing the formation of four symmetrical loops.

The process for manufacturing a flexible container according to the invention is optimal for the following dimensions: the length of the blank is preferably between 140 cm and
580 cm, - the width of the blank is preferably between 120 cm and
200 cm, - the length of each of the cuts is preferably between 40 cm and 80 cm, and - the distance between the cuts of each of the pairs is preferably between 5 cm and 25 cm, the lifting loops in formation thus having a width between 5 cm and 25 cm.

 A second object of the present invention is also a flexible container intended to receive bulk products obtained by the process described above, that is to say a flexible container of the type of those made of flexible material forming a double wall and comprising integrated lifting loops cut from this material.

 The essential characteristic of this container is that its lifting loops are of small width, preferably between 5 cm and 25 cm for a container with a perimeter between 240 cm and 400 cm.

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 Preferably, such a flexible container intended to receive bulk products has an integrated bottom forming a hopper cut from the material of the double wall.

 Advantageously, it includes an integrated cap forming a chute cut from this material.

 The container according to the invention has a well defined shape, substantially prismatic.

 It profitably includes a lining, preferably made of polyethylene.

 The flexible container intended to receive bulk products according to the invention preferably has four lifting loops regularly distributed around its perimeter.

 The invention will be clearly understood on reading the additional description which follows of several preferred forms of the invention, and with reference to the appended drawings which form part of the description.

BRIEF DESCRIPTION OF THE DRAWINGS
Figures la and Ib schematically represent the two essential stages of the manufacturing process of the flexible container according to the invention.

 Figures 2a and 2b show an additional characteristic of the two essential stages of the manufacturing process of the container according to the invention.

 Figures 3a and 3b schematically represent a variant of the two essential steps of the method of manufacturing the flexible container according to the invention.

 Figures 4a and 4b show another additional characteristic of the two essential steps of the method of manufacturing the container according to the invention.

 Figure 5a schematically shows an intermediate step in the process of manufacturing the flexible container according to the invention, and Figure 5b shows the last step resulting therefrom.

 Figures 6a, 6b and 6c respectively show a container obtained by the process shown in Figures la and Ib, a container obtained by the

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 process partially shown in Figures 3a and 3b, and finally a container obtained by the process shown in Figures 4a, 4b, 5a and 5b.

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
The starting raw material is a tube of flexible material generally supplied in a roll, of which an appropriate length is cut and placed on a flat surface. For the manufacture of a flexible container 50 to 250 cm high, there is then a rectangular piece ABCD, of canvas for example, in double thickness (seen from above in Figure la), of approximately 120 to 200 cm wide and about 140 to 580 cm long. This rectangular piece will hereinafter be called blank 1.

 As shown in FIG. 1 a, longitudinal slots 2 are cut in the double thickness of the fabric, on either side of the median EE ′ of the blank 1.

In this example, two pairs 3 of slots 2 are arranged in the central zone HH'II 'of the blank 1. The longitudinal axis, respectively FF', GG ', of each of the two pairs 3 is located approximately 30 to 50 cm edge AB; DC, and the slots 2 are between 40 and 80 cm long.

 The distance d between the slots 2 of each pair 3 is 5 to 25 cm, which will lead to the formation of four lifting loops of width d between 5 and 25 cm, and height between 20 and 40 cm, as we will understand it better by referring to Figure 1 b.

 In this figure, the tube of flexible material is shown after having turned the blank 1 axially on itself, the end BC of the tube situated on the right of the figure la having been brought back on the left part of the blank 1 and superimposed on its other end AD. The fold line 4 coincides in projection with the median EE 'of the blank 1 and it then forms one end 4 of a second double-walled tube 5, the upper end in this case.

 In the case where the container is made from a tube of woven material "laminated outside", the advantage of which is to ensure a good seal, the lamination is thus also inside the double wall of the second tube 5. This eliminates the risk of delamination from the outside of the container, by rubbing with

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 during transport, as well as during delamination of the interior by abrasion due to the product contained.

 Each pair 3 of slots 2 in the fold 4 delimits a lifting loop or loop 6 whose height is equal to half the length of the slots, and whose width is equal to the distance d separating them.

 Just close the other end AB; DC of the tube 5, by any means, to constitute the bottom 7 of a container having integrated lifting loops 6.

 One way of making this bottom 7 is to pre-cut the blank 1 before turning it over, as shown in Figure 2a.

 Triangular notches 8 are cut symmetrically with respect to the transverse median EE 'at the ends AD; BC of the blank 1, and in the extension of the axes of symmetry FF '; GG 'of the pairs 3 of slots 2. The cutouts being symmetrical, when the blank 1 is folded back on itself, the lines JJ'; KK 'of the bottoms of the notches 8 and the edges of these are superimposed as shown in Figure 2b.

 The four trapezoidal flaps 9 delimited in this way by the notches 8 can thus, after folding around their bases JK; J'K 'and assembly of the adjacent sides by sewing, form a bottom 7 in the form of a hopper.

 Note that the useful height of the container is the portion between the baseline HI; Hot lifting loops 6 and the JK line; J'K 'of the bottoms of the notches 8. It follows that in this process the initial length of the canvas blank 1 must be equal to twice the height of the container being formed, increased by twice the height of the handles 6 and double the height of the flaps 9 of the hopper.

 Figures 3a and 3b show a variant of the process set out in connection with Figures 1a, 1b, 2a and 2c.

 As shown in Figure 3a, the longitudinal slots 2 are here replaced by cutouts in the form of isosceles triangles 10 opposite in pairs by their bases. The bases of these triangles 10 are parallel to the long sides AB; DC of blank 1 and the vertices opposite to said bases are located on the transverse median EE '. As in the case of the slots 2, the distance between the bases of the triangles 10 determines the width of the lifting loops being formed.

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 After axial reversal on itself of the blank 1 consisting of the first tube, the triangular cutouts 10 form triangular notches 11, delimiting trapezoidal flaps 12. In a manner analogous to the formation of the bottom 7, we therefore end up with a cap having a shape of truncated pyramid after stitching together the edges 13 of the flaps 12. For a given loop height 6, that is to say for a determined length of the base of the isosceles triangles 10, the value of the angle at the top determines the section of the chute, the latter being greater the more obtuse the angle at the top.

 At this stage of manufacture, a cylindrical sleeve can be attached to the cap as well as to the hopper at the bottom, to result in the formation of a flexible container such as that shown in Figure 6b, which thus includes a line for loading. of the product in bulk in the flexible bag according to the invention and a pipe for the evacuation of said product.

 Alternatively, the chute can also be formed by appropriate cutting of the blank 1, as shown in Figures 4a and 4b.

In this case, the slots 2 are preferably offset towards the end
BC of half of blank 1 which will be outside after turning over. The ends of the handles, instead of being overturned on the same HI line; H'I ', as in the previous cases, are in this variant located on two separate lines HH'; II ', the ends of the handles inside the double-walled bag 5 being the closest to the fold line 4 (EE' in projection). In this way, the cutting in the AD part; EE 'of the blank which will correspond to the interior of the flap container 14, which will constitute the faces of the chute, will not weaken the structure too much. These rectangular flaps 14 are obtained by a U-shaped incision of the double thickness of the blank along two straight lines ML; Longitudinal NO and a transverse straight line segment MN. The length ML and the width MN of a flap 14 respectively determine the height and the width of the corresponding face of the chute.

To form the other two faces of the chute by cutting the missing flaps 14, L-shaped incisions are made in the edges AB and DC of the blank
1. The cutting lines PQ, QR, P'Q ', Q'R' are deduced from those of the central flap 14 by symmetry with respect to the median longitudinal axes FF'and GG'of the pairs 3 of slots 2.

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 After turning over the blank 1 and raising the flaps 14, these are assembled by sewing along their edges RQ; LM; WE ; R'Q 'to form the chute 15 of a container like the one shown in Figure 6c.

 This embodiment of a container according to the method of the invention preferably uses an attached bottom 7 rather than an integrated bottom 7.

Sa. The necessary intermediate step will be described in conjunction with Figure

Her.

 A piece 16 of rectangular fabric STUV of length ST approximately equal to the perimeter of the first tube 1 is cut, that is to say of length ST between 240 and 400 cm, and of width TU approximately equal to the diameter of said tube, c '' that is to say between 75 and 130 cm. This part 16 is folded in two longitudinally (along XX ') and, inside the fold XX', a cord 17 is placed, the ends of which are knotted outside the gusset thus formed. The assembly 16.17 is sewn along the edges ST; SEEN opposite the fold XX 'with the ends AD; BC of the second tube 5 to form the bottom 7 of the container.

 As shown in Figure 6c, the general shape of the base of the container obtained is cylindrical. The general shape of the upper part is substantially prismatic because of the folding of the cut elements 14, 12 of the blank 1 to form the cap 18 and the chute 15.

 If the process steps shown in Figures 3a and 3b are combined to form a pyramid hopper 19 and cap 18, and the process steps shown in Figures 4a and 4b to form a prismatic chute 15, a container with hopper 19, with cap 18, with chute 15 and with lifting loops 6 integrated well individualized.

 To improve the resistance of the container, and therefore its capacity, the longitudinal fibers 20 passing between the cuts 2.10 of each of the pairs 3 are reinforced by virtue of a different texture of the canvas at this location. It can also be sewn straps 20.

 It goes without saying that this container model can be provided with a shaped inner lining, in particular made of polyethylene, to make it waterproof, depending on its use.

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 This container structure, which has so far been obtained only by assembling a large number of separate elements, contrasts with the generally shapeless bags which are the result of the implementation of the same method of base, that is to say the inversion on itself of a tube 1 of flexible material provided with openings 2.10 to form lifting loops 6, and its closure at the ends AD; BC.

 The structured shape of the container obtained by the method according to the invention facilitates the handling and storage thereof: the handles are well released and the container is stable. The chute 15 and the hopper 19 allow rapid loading and unloading.

 The process of manufacturing most of the elements 6, 15, 18, 19 of the container from a single cut piece increases productivity and reduces costs.

 The method of manufacturing a flexible container intended to receive bulk products described above therefore combines the advantages of much more complex methods as regards the results with those of artisanal methods, of the type used in making "sea bags". ", as for simplicity.

 It goes without saying that the invention is not limited to the technical specifications described above, or to the several different embodiments mentioned, given by way of examples; on the contrary, it embraces all the other possible alternative embodiments.

Claims (23)

1) Method for manufacturing a flexible container intended to receive bulk products, of the type comprising those of the following steps: a) a first step consisting in cutting flat a first tube of flexible material approximately at least a length equal to twice the height of said container ending in a rectangular blank (1) ABCD elongated from said double-thickness material having a first (AD) and a second (BC) ends, b) a second step consisting in arranging in the middle zone ( HH '; I') of said first tube at least two longitudinal cutouts (2,10) of sufficient length to subsequently form at least two lifting loops (6), c) a third step consisting in forming a second tube (5) having a double wall by axial reversal of said first tube on itself along a circular fold line (4), substantially median, so as to juxtapose said first end (AD) and ladi te second end (BC), said second end (BC) being located outside of said second tube (5), and d) a fourth step of forming the bottom (7) of the container by closing the second tube (5) at said ends (AD; BC), characterized in that said cutouts (2.10) are made in said double thickness and are arranged in pairs (3) having a longitudinal and transverse symmetry, the two cutouts (2.10) of each of said pairs (3) being at a short distance (d) from each other so as to delimit lifting loops (6) of small width subsequently.  2) A method of manufacturing a flexible container according to claim 1, characterized in that the cutouts (2,10) have the shape of isosceles triangles (10) opposite in pairs by their bases, said bases being parallel to the long sides (AB; DC) of the blank (1) and the vertices of said triangles (10) being located on the transverse median (EE ') of said blank (1).  3) A method of manufacturing a flexible container according to claim 2, characterized in that the angle at the top of each of the cutouts (10) in <Desc / Clms Page number 14>  triangle shape is determined based on the diameter of the filling chute (15) and the height of the lifting loops (6) of the future container.  4) A method of manufacturing a flexible container according to claim 1, characterized in that the cutouts (2,10) are thin slots (2). 5) A method of manufacturing a flexible container according to claim 4, characterized in that the slots (2) are located astride the transverse median (EE ') of the blank (1).  6) A method of manufacturing a flexible container according to claim 4, characterized in that the slots (2) are offset towards the second end (BC) relative to the transverse median (EE ') of the blank (1).  7) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 6, characterized in that said second step further consists in cutting triangular notches (8) in the first (AD) and second (BC) ) ends of the blank (1) in the extension of the longitudinal axes of symmetry (FF '; GG') of the pairs (3) of cutouts, delimiting trapezoidal flaps (9) in said first (AD) and second (BC) ends of said blank (1).  8) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 6, characterized in that it comprises an intermediate step consisting in: - cutting a strip (16) of flexible material of length approximately equal to the circumference of the first tube and of width approximately equal to the diameter of said first tube, - fold said strip (16) in half lengthwise, in a fold (XX '), so as to make the longitudinal edges coincide (ST ; VU), - place a cord (17) inside the fold (XX ').  9) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 8, characterized in that said fourth step consists in assembling the edges of the trapezoidal flaps (9) or in fixing the longitudinal edges (ST; VU ) of said strip (16) with the ends (AD; BC) of the blank (1). <Desc / CRUD Page number 15>  10) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 9, characterized in that said second step further consists in: - cutting the blank (1) between each of the pairs (3) in two longitudinal line segments (ML; NO) and a transverse line segment (MN) forming a U whose opening is located on the transverse median (EE ') of said blank (1) and directed towards said second end (BC), the height and width of said U being respectively equal to the height and width of the face (14) of the chute (15) of said container in formation formed by the flap (14) thus released, - cutting the longitudinal edges by symmetry (AB; DC) of said L-shaped blank (1) in order to prepare the formation of the other faces (14) of said trough (15). 11) A method of manufacturing a flexible container according to claim 10, characterized in that it comprises an additional step consisting in raising the flap (14) corresponding to each of the faces (14) of the chute (15) and to the attach to the others to constitute said chute (15). 12) Method for manufacturing a flexible container according to any one of the preceding claims 1 to 11, characterized in that the longitudinal fibers (20) of said container passing between the cutouts (2,10) of each of the pairs (3) are reinforced, preferably by virtue of a texture different from the material at this location (20). 13) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 11, characterized in that the longitudinal fibers (20) of said container passing between the cutouts (2,10) of each of the pairs (3) are reinforced, preferably by means of a sewn strap (20). 14) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 13, characterized in that the material is a woven having a lamination on one side and in that the inversion of the first tube is produced in such a way so that said lamination is inside the double wall of the second tube (5). 15) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 14, characterized in that the length of the <Desc / Clms Page number 16>  first tube is approximately twice the height of said container, first tube is also formed increased by a length sufficient to release the lifting loops (6), at least equal to the height of said loops (6), and preferably of an additional length to constitute the bottom (7).

16) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 15, characterized in that the number of pairs (3) is preferably equal to two, the longitudinal axis of symmetry (FF '; GG ') of each of said pairs (3) being at a distance from each of the longitudinal edges (AB; DC) of the blank (1) equal to 1/4 of the width of said blank (1), thus preparing the formation of four of said symmetrical lifting loops (6).  17) A method of manufacturing a flexible container according to any one of the preceding claims 1 to 16, characterized in that: - the length of the blank (1) is preferably between 140 cm and 580 cm, - the width of said blank (1) is preferably between 120 cm and 200 cm, - the length of each of the cuts (2, 10) is preferably between 40 cm and 80 cm, and - the distance (d) between said cuts (2,10) of each of the pairs (3) is preferably between 5 cm and 25 cm, the lifting loops (6) in formation thus having a width between 5 cm and 25 cm.  18) Flexible container intended to receive bulk products obtained by the process according to any one of the preceding claims 1 to 17, of the type of those made of flexible material forming a double wall and comprising integrated lifting loops (6) cut from said material, characterized in that said loops (6) are of small width, preferably between 5 cm and 25 cm for a perimeter container between 240 cm and 400 cm.  19) Flexible container according to claim 18, characterized in that it comprises a bottom (7) integrated forming hopper (19) cut from the material of the double wall. <Desc / Clms Page number 17>  20) Flexible container according to any one of claims 18 or 19, characterized in that it comprises an integrated cap (18,15) forming a chute (15) cut from the material of the double wall.  21) Flexible container according to any one of the preceding claims 18 to 20, characterized in that it is of substantially prismatic shape.  22) Flexible container according to any one of the preceding claims 18 to 21, characterized in that it has a lining, preferably made of polyethylene.  23) Flexible container according to any one of the preceding claims 18 to 22, characterized in that it preferably comprises four lifting loops (6) regularly distributed around its perimeter.