FI88281C - Large bag made of round woven fabric - Google Patents

Description

15828!

Large bag made of round woven fabric Storsäck tillverkad av rundvävt tyg 5

The invention relates to a large sack made of round woven fabric.

Large sacks are made of either flat woven fabric or round woven fabric. Making a large bag from a flat-woven fabric requires 10 more stitching seams, which makes it generally more advantageous to make a large bag from a round-woven fabric.

The round woven fabric is woven so that the widths of both the weft and warp yarns are selected so that the finished round woven fabric is smooth and flat. In a circular woven fabric, the warp yarns are parallel to each other so that their edges almost touch each other, but due to the structure of the weft yarns prevent this perfect contact. A similar property also occurs for weft yarns.

20 Due to the structure described above, the round woven fabric has a relatively loose structure. If such a round woven fabric is loaded in any way, the warp yarns and the weft yarns, respectively, move easily with respect to each other because there is very low friction between the warp and weft yarns and the warp and weft yarns are flat in shape. In a circular woven fabric, both warp and weft yarns form a slight bend whenever they cross each other in the woven fabric because the dimension of both the warp and weft yarns is wide and thin.

30 Due to the structure of the circular woven fabric, the loading force on the circular woven fabric does not load directly on the fabric itself, but directly on the warp and weft yarns. As a result, the load force always searches for the weakest point in the warp and weft yarns, from which the possible breakage of the structure in the load situation begins. Such onset of rupture, of course, weakens the overall structure of the round woven fabric and eventually the round woven fabric breaks.

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The object of the invention is to provide a large bag made of a circular woven fabric, in which the circular woven fabric is better able to withstand loading forces than before.

The object of the invention is achieved by a large sack made of a circular woven fabric, characterized in that the width of the weft and / or warp yarns is chosen such that at least one of the weft and warp yarns enters a smaller space in the circular weave, at least one kan-10 and that the magnitude of said compression is at least 10%.

The weft yarns of the round woven fabric according to claim 2 have a compression of at least 10%.

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The warp yarns of the round woven fabric according to claim 3 have a compression of at least 10%.

According to claim 4, the compression of both the weft and warp yarns is at least 10%.

According to claim 5, the compression is 20-50%.

According to claim 6, the compression is 30-40%.

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Due to the realization according to the invention, the width of the weft and / or warp yarns has been chosen such that the space reserved for them is insufficient in the structure. As a result, the weft or warp yarn or both are forced to assume their normal state in circular weaving, as a result of which the weft or warp yarn or both are compressed and folded vaguely to fit in the given space.

The phenomenon described above results in the surfaces of the weft and / or warp yarns becoming uneven and, on the other hand, the bending angle of the weft and / or warp yarns increasing. Both phenomena increase the internal friction of the structure of the round-woven fabric and, on this basis, 3

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the strength of the fabric. When such a compacted round woven fabric is loaded, the structure is able to withstand the load force more than before, whereby the initial threshold of fabric breakage increases and a much higher load force is required for the fabric to break. 5

In order to keep the basis weight of the tightly woven fabric the same as in a conventional circular woven fabric, the thickness of the weft and warp yarn must be slightly thinned. Thinning the yarns in itself strengthens the structure of the round-woven fabric. This phenomenon is, of course, known per se and is based on the fact that the orientation for weft and warp yarns takes place optimally with a thinner yarn, because the heat distribution in the thin yarn is better than in the thick yarn.

Due to the higher internal friction, the tightly circular woven fabric is also more advantageous with respect to the seam seams, because when making a large bag, it is not necessary to leave as large a post-seam edge in the tightly circular woven fabric as in a conventionally round woven fabric. This is because when the stitch is stressed in a tightly circular woven fabric, the weft or warp yarns do not slip out of the seam 20 as easily as in a conventional circular woven fabric.

The invention will be explained in detail with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows an axonometric view of a commonly used embodiment of a large bag known from the prior art.

Figure 2 shows axonometrically another commonly used embodiment of a large sack known from the prior art, in which the inner sack is attached to the outer sack in a manner according to FI patent application No. 904459.

Figure 3 is a schematic side view of a compacted weft or warp yarn according to the invention.

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Figure 4 shows a schematic side view of a folded and compacted weft or warp yarn according to the invention.

Figure 5 shows a schematic side view of a sealed weft or warp yarn according to the invention, in which the sealing is random, i.e. vague.

The large bag known from the prior art shown in Fig. 1 is generally indicated by reference numeral 10. The large bag 10 comprises a jacket 11, 10 a filling / lifting opening 12, a base 13 and lifting loops 14. The lifting loops 14 are each individually compressed in a manner known per se The big bag 10 according to 1 is provided with an inner bag (not shown) as is known per se.

The prior art large bag shown in Fig. 2 is generally indicated by reference numeral 10a. The big bag 10a differs from the big bag according to Figure 1 only in that the lifting loops / lifting loop 14 are first assembled and the assembled lifting loop structure is surrounded by a strong tarpaulin 15, cloth or other means. The inner bag 20 of the large bag 10a is indicated by the reference number 16. The inner bag 16 is closed from the closure point 21. The closure point 21 may be formed by a seam or a string or other similar solution. The area above the closure 21 of the inner bag 16 is bent to the outer surface of the outer bag and glued to the outer surface of the outer bag 10a after filling the outer bag with a hot-melt seam 22. Alternatively, the area above the closure 21 of the si-25

Figure 3 shows schematically how the compacted weft or warp yarn K, L according to the invention is present in a circular woven fabric.

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Figure 4 shows how the folded and compacted weft or warp yarn K, L occurs in a circular woven fabric.

Figure 5 shows how the sealing of the weft or warp yarn K, L 35 according to the invention is random, i.e. completely vague. In fact, i. · O '' · ·! .., O I 5 when the compression is more than 10% the compaction is usually practically completely vague.

A compression of at least 10% can be achieved by way of example 5 by compacting a weft yarn K with a width of 5 mm into a space of 4.5 mm. As the compression is raised from 10% upwards, the structure of the densified round woven fabric becomes stronger and stronger. The theoretical upper limit of the compression depends, of course, on the weaving machines currently in use and on the weaving technique.

In practice, it has been found that the compression is preferably 20-50%, whereby the structure of the compacted round woven fabric is sufficiently strong. Highly reliable and reliable strength is achieved when the compression is 30-40%.

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The invention can be applied to any big bag solution. The large bag may comprise one, two, four or more lifting slings. The big bag can also be without lifting slings, in which case there is a rope loop at the top of the big bag for lifting the big bag.

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Only the basic understanding of the invention and some preferred embodiments thereof have been described above. It will be apparent to one skilled in the art that the details of the invention may vary within the scope of the inventive idea set forth in the appended claims.

Claims (6)

1. Large bag made of round-woven fabric, characterized in that the width of the weft and / or warp threads (K, L) is selected so that at least none of the weft and warp wires (K, L) end up in a space smaller than a conventional space in round weaving, whereby at least the lower ends of the weft and warp threads (K, L) are compressed into the fabric and the size of said compression is at least 10%. 10 2. A large bag according to claim 1, characterized in that the compression of the weft trees (K) is at least 10%. Large bag according to claim 1, characterized in that the compression of the warp trees (L) is at least 10%. A. Large bag according to claim 1, characterized in that the compression of the bed weft and warp trees (K, L) is at least 10%. 20 5. A large bag according to any one of claims 1-4, characterized in that said compression is 20-50%. 6. A large bag according to any one of claims 1-4, characterized in that said compression is 30-40%.