PT90714B - PROCESS FOR THE MANUFACTURE OF A FLEXIBLE MATERIAL CONTAINER FOR TRANSPORT AND STORAGE OF BULK PRODUCTS - Google Patents

Abstract

The method for manufacturing a flexible material container for transporting and storing products in bulk includes the operations of forming and stitching the container which is to be made, from a flat or tubular rectangular sheet (1) of suitable material (fabric and/or plastic.) As of this sheet, by means of a series of folds, a square or rectangular bottom is obtained for the respective container (C1), in terms of the distance between the stitching reference points; this all without effecting any cut upon the corresponding sheet. The bottom may or may not be affected by an intermediateseam, while the container may or may not be affected by side seams. A top feed opening is shaped in the container and the mouth can be open all along the container, or there may be access only through the end areas of the sides, upon the top edge forming a suspension handle being closed.

Description

CONDEPOLS, S.A.

PROCESS FOR MANUFACTURING A CONTAINER OF MATERIAL

FLEXIBLE FOR TRANSPORT AND STORAGE OF BULK PRODUCTS

OBJECT OF THE INVENTION

The present invention relates to a process for forming a container of flexible material for transporting and / or storing bulk products (cereals, fertilizers, vegetables, etc.).

The container obtained according to the process of the invention has a square or rectangular bottom, which forms a perfectly stable base when filled with a product.

said container can be obtained from a single rectangular sheet; or from two equal sheets properly overlapping; and can be obtained even from a tubular portion. In any case, it is necessary to bend certain parts to form the container with its square or rectangular bottom.

BACKGROUND OF THE INVENTION

In general, the handling of bulk products, for example fertilizers, cereals, flour, etc., whether for the transport, storage, distribution and / or sale of them, requires fabric or plastic bags that normally have a small capacity ( 25, 50, 100 Kg), which require a considerable number of workers, or, at best, a great waste of time with the displacement of the many bags needed to contain large quantities of bulk products as indicated above.

In order to eliminate labor or workers to a large extent, or, at best, to reduce the time needed to handle large quantities of bulk products, large bags of very resistant fabric have been used up to now, which, of course, are handled for loading and unloading by means of cranes or similar means, so that, by means of this technique, it is possible to rationalize and lower the handling, transport and storage of said bulk products.

The large capacity bags mentioned above are generally made up of three basic parts or systems:

1) System in suspension or support 2) System in container 3) System in waterproofing

With regard to the first system, the system called suspension or support, can consist of strips of very resistant tape, strips formed with the same fabric, wings called loops and which can be made with the same material as the container or with palettes attached to the bottom of the bag or container.

The function of this system is to make it possible to handle the bag as soon as it is filled with the corresponding product.

As for the container system, it consists of a very resistant fabric on which the product rests.

Finally, the waterproofing system, although not always necessary, consists, when necessary, of a film bag inserted inside the fabric.

Given the large capacity of said containers, they need to have a good base; in other words, its support base, as soon as the container is full, has a flat shape. This flattened base is obtained by cutting the fabric which, as soon as it is conveniently sewn, generally forms square or rectangular bottoms. There are examples of forming container bottoms and applying cutting methods to form them in the Spanish utility model N9. 289577 of 31-8-84, filed by Norsk Hydro A.S., and in French patents N9. 2517280, dated 1-12-1981, deposited by Boussac Saint-Frères-FR and N ^. 2356569, of 6/27/1977, deposited by Norsk Hydro A.S.

These cuts to form the bottom of the container imply waste of material that increase the cost of the container, while at the same time, make it difficult, and in most cases, prevent the automatic manufacture of the container.

On the other hand, when it is intended to have a waterproofing system by means of film bags, they need a bottom or base that adapts to that of the container in order to avoid the formation of cavities that prevent the proper settlement of the container; and, at the same time, they require the container to be expanded or filled with air to adapt to the geometric shape of the container bottom.

DESCRIPTION OF THE INVENTION

Taking into account all these drawbacks, the present invention proposes a process for obtaining the formation of a base of a flexible material container from a flat or tubular sheet made of fabric, plastic or similar, through a series of folds. , as will be indicated in the present specification, obtaining a square or rectangular base or support base; with or without a closing seam on said bottom. Thus, these drawbacks are effectively and advantageously eliminated, from a suspension system that can be adapted to conventional containers, the following being the advantages of this formation process:

s) Starting from a rectangular sheet made of fabric, plastic or both combined, it has the particular characteristic that for forming the base, whether square or rectangular, it is not necessary to cut the sheet.

2§) With the application of the process of the present invention, a base is obtained in the container that gives the possibility to sew the film bag, when the base needs to be waterproofed, thus obtaining a perfect fixation of said bag to the container, and at the same time, avoiding the expansion of the bag to adapt it to the container.

39) Due to the fact that for the formation of the bottom of the container it is not necessary to make any kind of cut in the original sheet, any type of design can be made in the said sheet to suspend the container.

4§) The process for forming the bottom of the container is entirely valid for use with sheets of fabric, plastic or similar, with tubular shape.

59) Given that for the application of the formation process of the bottom of the container, either from flat fabric or from tubular fabric, and / or even from plastic sheets, it is not necessary to make any type of cut, avoid

waste of material, and at the same time, weak points are avoided, as the cuts have to be sewn, and the more seams have a bottom, the more operational points appear in the latter, increasing the risk of fracture.

Finally, it must be said that the opening of the water supply corresponding to the container is formed by the open sides on both sides formed from the suspension zone for flat tissue; or, by means of fusion, cut perpendicular to the suspension zone for tubular tissue.

In order to complement the description that will be made hereinafter and in order to provide a better understanding of the characteristics of the invention, the present specification is accompanied by a set of drawings, whose figures represent the following:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 represents an evolving view of the sheet from which the container object of the present invention is made, it being possible to see clearly that from the central axis, whose dashed area is intended for the suspension, folding or overlapping of the parts of the sheet which are formed on both sides of the central axis must be carried out and sewn to form the container itself.

Figure 2 shows a general perspective view of the reΊ

container obtained from the leaf shown in figure 1, being possible to see the flat rectangular shape of the bottom.

Figure 3 represents the same container as in the previous figure, with the suspension zone formed by the meeting of the upper part, the joined part being held by a clamping portion to form the said holding or suspension zone of the container.

Figure 4 represents a developing view of another sheet analogous to that of Figure 1, in order to obtain another container from it, varying from the first in the way of carrying out the folding.

Figure 5 represents a general perspective view of a container obtained from the sheet shown in Figure 4

Figure 6 shows a view in development of two sheets from which a container can also be obtained, based on the same principles on which the containers represented in the previous figures are based.

Figure 7 shows a general perspective view of the container obtained from the two leaves shown in Figure 6.

Figure 8 represents a developing view of a tubular sheet from which another container is obtained, also based on the same principles.

Figure 9 shows a perspective view of the container

obtained from the tubular sheet or portion shown in figure 8.

Figure 10 represents the same container as in the previous figure, with the handle or suspension zone formed.

Figure 11 represents a view of another tubular sheet different from that shown in Figure 8, from which another container is obtained.

Figure 12 shows the container obtained from the tubular sheet or portion represented in figure 11.

Figure 13 represents a perspective view of the container obtained from the sheet shown in Figure 1, but according to a variant in the formation stages, as will be described later.

Figure 14 represents the same container as the previous figure, with the handle or suspension zone formed.

DESCRIPTION OF EXAMPLES OF PREFERRED EMBODIMENTS

As can be seen in the figures mentioned above, the process of the present invention aims to obtain a container with a square or rectangular base or support base which, when said container is full, is a perfectly stable base. Similarly, the process has the objective of obtaining a container from a sheet, flat or tubular, and, in any case, made of fabric, plastic, etc., all without having to make any cut to obtain the said square bottom. or rectangular, which may or may not have a seam.

Continuing with the description of how to obtain the represented container or containers, also based on the same principles, figure 1 represents a sheet for obtaining precisely one of the containers according to the invention. In other words, the container object of the invention is made from a sheet (1) of suitable material, which can be woven, plastic, etc. As you can see in the sheet (1), there is no type of cut to form the bottom (F1) of the container shown in figures 2 and 3. To form the container (C1) shown in figures 2 and 3, simply fold the sheet represented in figure 1 along the central axis (I — I ') so that the points (A-A'), (CC ¹ ), (0-0 '), (D-D') and (Β - B ') become coincident, and the edges formed by the said points are sewn later. Logically, if a film bag is inserted between the edges formed by the points (CD) and (C'-D '),

before sewing, this bag will be fixed to the bottom of the container, between those points.

Then, the vertex (B —B ') in the interior is raised to the coincident points (B-B'), so that the points (D with D) and (D 'with D') become coincident, and, subsequently, it is sewn from the common stitch (DDD '-D') to the stitch (N-Ν '), keeping the side closed.

Similarly, the other side formed by the overlapping of points (M-M '), (A-A'), (C-C ') and (A-A') would be sewn, taking the vertex (A- A ') to the points of coincidence (A-A'), so that the points (C with C) and (C 'with C') coincide and form the seam (K1.)

The filling zone of the container (c1) remains defined by the areas of the non-stitched sides, included by the points of coincidence (N-Ν ') and (MM ¹ ) and the folding axis (I —I'.)

Figure 2 represents in perspective the formation of the container (C1), according to the process mentioned above, in which the formation of a square bottom stands out as a predominant factor, making equal divisions in the bottom (A-A '/ C-C ') = (C-C' / / 0-0 ') = (0-0' / D-D ') = (DD ¹ / B-B'); or the formation of a rectangular bottom (A-A '/ C-C') = (D-D '/ B-B') and different from (C-C '/ O-O') = = (0-0 '/ DD'); and always from a sheet of fabric, plastic, etc., without making any kind of cut on the sheet and with a seam (R1) on the bottom (F1.)

The suspension zone remains constituted by the trail edge 1

Figure 1, which after the gathering of the base material at one point, is subsequently gripped by an independent flat sheet (L), with appropriate dimensions (according to the detail in Figure 3), of the same or different technical characteristics for the base material; and the one being sewn by its free edges (1-2 and 3-4), after overlapping, which forms the loop or suspension point, exactly as shown in figure 3.

If you start from the rectangular sheet (1 ') of fabric, plastic, etc., shown in figure 4 and apply the same process mentioned above, but leaving the axis (1-1') as the base on which to fold the sheet, it can be seen in figure 5 how the container (C1 ¹ ) is formed with a square or rectangular base without having made any previous cut in the sheet and without any type of subsequent seam to form said bottom of the container; and with the particular characteristic that the opening remains open, so that any model for the suspension and filling of the container can be adopted.

In order to obtain the formation of the container (Cl *), fold the sheet (1 ') of fabric, plastic, etc., so that the points (A-A'), (B-θ '), (E — E ') and (FF ¹ ) become coincident. Then, the vertex defined by (I ') is made to coincide on the inside with the points of coincidence (F-F'), then the points (D ') and (D) on the outside coincide with the point

2

(D.) Then sew from the connection of the points (D), (D ¹ ) and (D) to the point formed by the overlap of the points (M ¹ ) and (Ν '), closing the edges in the sides.

In the same way, the other side formed by the overlapping of points (AA ¹ ), (MN), (E-E ') and (C'-C) would be sewn, taking the vertex (I) inside until the points of coincidence ( E-E ') in order to make points (C *), (C) and (C) on the outside coincide.

If this process is applied, it will be observed that a container (C1 ') is formed with an open mouth, which mouth can be used for any type of suspension and filling model of the container. At the same time, it can be seen that the bottom of the container (C1 ') shown in figure 5 is formed without any type of seam in it. Like the container (C1) shown in figures 2 and 3, in this case it is also possible to obtain a square or rectangular bottom just by changing the distances between the sewing reference points, applying the training principles described previously for the said figures 2 and 3.

If you start with two (2) equal sheets of fabric, plastic, etc., shown in figure 6, and after the overlap of the sheets in order to match the points designated by the same letters and the execution of the indicated manufacturing operations to obtain the container shown in figure 2 from

from the development of figure 1, the container (C2) shown in figure 7 is obtained. A container that can have a square or rectangular bottom, according to the principles explained for the container in figure 2, and with an open mouth, mouth the one that can be used for any type of container suspension and filling model.

If tubular sheets (3) or (3 ') of fabric, plastic, etc. are used, the container object of the invention provides two possibilities when power is transmitted during its work, or, to put it another way, when it is full or suspended ; one towards the warp (see figures 8 and 9) and the other towards the weft (see figures 11 and 12). In said figures 8 and 11, the arrow X represents the warp direction; while the arrow Y represents the direction of the plot.

If you look at figure 11, you can see that it is a tubular sheet (3 ') that can be made of fabric, plastic, etc. Then, in order to obtain the formation of the container (C3 ') of figure 12, we return to what was explained above for figures 1 and 2, since if we observe the same it will be clearly seen that when the rectangular piece by the axis (I-1 '), a bottom of figure 4 is obtained equal to that of figure 11, and a suspension of figure 1 equal to that of figure 12.

If the container (C3) object of the invention is to be obtained from the tubular sheet (3) of fabric, plastic, etc.,

as shown in figure 6, and in order to avoid side seams for the formation of the bottom of the container, which would decrease the diameter of said base, it will be necessary to proceed as follows:

If the process is adopted, it will be observed that a container (C3) is formed, according to figure 9, with the mouth open, a mouth that can be used for any type of suspension and filling model of the container. Also and according to the same criteria explained above in this specification, for flat sheets of fabric, plastic, etc .; with tubular sheets of equal technical characteristics, square or rectangular bottoms can be obtained by changing the sewing reference points. If you now want to obtain the container (C3) shown in figure 9, which is supposed to be filled, from a tubular sheet according to figure 8, just take the vertex (C) inside the points of coincidence (0 -0 '), so that the point (E) occupies the initial position of (C) and that the points of coincidence (A-A') are on the outside (E) and the seam starts; before starting to sew to the point (0-0'-C), the process is repeated with the other end, taking the apex (D) inside to the points of coincidence (0-0 ') so that the stitch (F) occupies the position of stitch (D) and that the points that also coincide (B-B ') meet at the outer point (F) in their new position, and then the sewing process continues until the end .

In this case, you can also insert a film bag

between the points of coincidence (B-B ') and (A-A') and sew it simultaneously to the bottom seam (F3) of the container. Logically, if the vertices (C) and (D) are taken inside an equivalent distance from (O-θ ') and if you follow the formation process explained above, the shape of the bottom of the container will be rectangular with the seam ( R3) in the same.

Also and according to the same criterion explained above, for flat sheets of fabric, plastic, etc., with tubular sheets of equal technical characteristics, one can obtain square or rectangular bottoms only by changing the distances from the reference points of the seams . To form the suspension of the container, as shown in figure 10, the edges (M-N and M'-N ') are sewn overlapping and the sewn pieces are subsequently joined on the central axis of the container. Then, join everything with the sheet of independent material (L), with appropriate dimensions, with the same or different technical characteristics, to the base material, which is sewn on its free overlapping edges, as indicated above (see detail together with figure 3), forming a loop or suspension point. The supply opening remains defined by melting cuts, which are not sewn (M-M '/ K and N-N' / K '.)

Logically, this way of forming the bottom in tubular sheets is perfectly applicable for flat sheets of fabric, plastic, etc. (see figures 13 and 14.) In fact, if

observe figure 1, the first thing to do is to fold the sheet along the central axis (1-1 ') so that the points (B-B'), (D-D '), (B- B '), (N-Ν'), (DD *), (0-0 '), (C-C'), (A-A '), (C-C'), (A-A ') and (M-M '); and the lateral edges formed by the points of coincidence (B-B '), (D ~

-D '), (B-B') and (N-Ν ') start to be sewn; and (A-A '), (C ~ -C'), (A-A ') and (M-M'.) Subsequently, the vertex (BB ¹ ) is taken inside until (0-0 ') from so that (D-D ') takes the place of (B-B') and that (D-D ') is placed on the outside (D-D') in its new position and sewing is continued. Before reaching (0-0 ') / (Β-B'), the operation is repeated with the other end, taking the vertex (AA ¹ ) up to (0-0 ') / (BB') of so that (C-C ') occupies the position of (A-A') and that it is placed outside (C-C ') in its new position and the seam mentioned above is completed.

In this way, a bottom (F4) of the container (C4) is obtained, represented by figures 13 and 14, which bottom can be square or rectangular in terms of the distance between the sewing reference points. As in the previous cases, if the container is to be leakproof, a film bag can be inserted between the stitches (CC 'and D-D'), before sewing the bottom and joining it simultaneously formation.

The bottom (F4) forms the seam (R4).

The suspension and filling zone would be formed according to what was explained for the container represented in FIG. 7

Figure 3 from the sheet of appropriate material shown in the first figure, keeping the container (C4) as shown in figure 14.

Claims (13)

1.- Process for the manufacture of a flexible material container for the transport and storage of bulk products, in which the container itself (Cl; Cl '; C2; C3; C3' and CU) is obtained by means of a appropriate seam of a tubular portion of flexible material, for example plastic and / or fabric, the tubular portion of which can be formed (3 or 3 ') or obtained from a rectangular sheet (1 or 1') which is folded along the its middle transverse line (I-I ') or can be obtained from two equal overlapping sheets (2), etc., characterized essentially by the fact that the process itself includes the folding operations towards the inside of the corners of one of the ends of the tubular portion and seam connection, before folding the corresponding areas, of a series of points of that tubular portion to finally sew the sides to be able to delimit a flat area that forms the bottom of the container, without cuts from the original sheet, all this so that in terms of the distance between certain points of those that are connected, a square or rectangular bottom can be obtained. 2. The method according to claim 1, characterized in that, in order to obtain the container (Cl), the sheet (1) is folded in its middle transversal line (II ¹ ), making the points (AA ¹ ) coincide. , (C-C '), (O-θ'), (D-D ') and (B-B'), then proceed to sew the edges formed by those points, then to bend the corners corresponding to the end that will form the bottom, making the vertex (B-B ') coincide with the points (B ”and B'), before bending the first towards the interior, and, similarly, making the points (D ”With D) and (D *” with D *), then sew from the common stitch (D-D'-DD ”') to the stitch (NN ¹ ), thus forming the seam and the respective closure from that side, to proceed in a similar way to the other side, so that the lateral folds of the bottom are sewn in correspondence with the said side seams, obtaining the container Cl with the middle seam of the bottom and the opening d and load and the upper suspension area formed by the side areas not sewn and included between the coincident points (N-Ν '), (M-M') and the fold line (II *). 3.- Process according to claim 2, characterized -, because the lateral folds of the bottom are sewn in the center (0-0 ’) of the latter, obtaining the formation of the container (C4). 4. A process according to any one of claims 2 and 3, characterized in that the rectangular bottom of the container (Cl or C4) is obtained when the distances (C-θ 'and D-θ') or (C'-0 and D'-0) are different from the distances (AC and BD) or (A'-C 'and B'-D'), while the square bottom is obtained when the said distances are equal to each other. 5.- Process according to claim 1, characterized in that, in order to obtain the container (Cl '), the sheet d') is folded in its middle transverse line (1-1 '), making the points ( A-A '), (B-B'), (E-E ') and F-F'), to make point (I ') coincide with the coincident points (F, F'), while make the points (D 'and D) coincide on the outside with the point (D), then proceed to stitch from those common points (D-D'-D) to the common point (M'-N'), thus forming the seam and the respective side closure, proceeding in a similar way to the other side, so that the lateral folds of the bottom are sewn in correspondence with the said side seams, thus obtaining the container (Cl ') without any seam on the bottom of this and with its loading opening completely open to allow the assembly of any suspension means in it. • · · Process according to claim 5, characterized in that the square bottom of the container (Cl ') is obtained when the distances from the sewing reference points (IC) and (I'-D) are equal to the distances from the points (C) and (D) in the center, while the rectangular bottom is obtained when the said distances are different. 7. Process according to claim 1, characterized in that to obtain the container (C2), the two equal sheets (2) are superimposed, making the points (AA), (0-0), (DD ), (FF) and (HH) of them, then folding the corners corresponding to the ends that will form the bottom, making points (B) coincide with (G), (D) with (I) and (A) with (F), as well as (D) with (H), then sew the sides to the points (MM *) and (N-Ν '), forming the seams and respective side closures, and forming a loading opening at the top completely open and a flat bottom with an intermediate seam, and where the bottom side folds are sewn to the side seams themselves. 8. Process according to claim 7, characterized in that the square bottom of the container (C2) is obtained when the distances (AB) and (B-0) are equal to the distances (CD) and (C-0), while the rectangular bottom is obtained when the said distances are different. 9. Process according to claim 1, characterized in that, in order to obtain the container (C3), it starts from a tubular portion (3), starting by taking the point (C) to the point of coincidence (0-0 *), with stitch (E) occupying the starting position of stitch (E), while stitches (A-A ') have to embrace at stitch (E), then start sewing the edges formed by these points, so that before reaching the common point (0-0'-C) the process is repeated in the part that is symmetrical in relation to the point (0-0 '), taking the point (D) until it reaches these coincident points (0-0 '), making point (F) occupy the initial position of point (D), while points (B-B') have to embrace each other outside point (F) in its new position in order to continue making stitches until the seam is finished, all so that the container (C3) is obtained with a flat bottom in which the folds of it are sewn over the central point (0-0 ' -CD) of the same, while its loading opening is completely open. 10. A method according to claim 9, characterized in that the square bottom of the container (C3) is obtained when the distances (DB) and (B-0) are equal to each other and equal to the distances (CA) and (A -0), while the rectangular background is obtained when the referred distances are different. 11, - Process according to claim 1, featuring / -23s < by obtaining the container (C3 ') to be initiated by the tubular portion (3 *), making the points (C-C'-C) and (D-D'-D) coincide, proceeding analogously with the folding of the corners with nothing more than making point (I) coincide with common points (F-F ') and point (I') with points (E-E '), then sewing from the coincident points (C- C'-C) and (D-D'-D) until the points (M-M ') and (N-Ν') reach, respectively, forming the container (C3 ') with the respective seams and side closures, a seamless flat bottom and a loading opening with suspension elements, which are formed by the open opening between the points (M-M ') and (I), and the points (N-Ν') and (I '), with the particular characteristic that the side folds of the bottom are sewn to the side seams of the container itself. 12. Process according to claim 11, characterized in that the square bottom of the container (C3 ') is obtained when the distances (I'-C) and (ID) are equal to each other, and in addition, the distances of the points (C) and (D) in the center are also equal while the rectangular bottom is obtained when the said distances are different. 13.- Process according to any one of the preceding claims, characterized in that the container (Cl, C3 and C4) has a material assembly opposite the corresponding bottom, a material assembly to which a sheet (1) is attached with same or different technical characteristics, a connection that is made by wrapping said sheet to form a suspension loop and under it the corresponding loading opening of the container itself,