EP2302117A2 - Transport bag and method for producing a reinforced textile edge - Google Patents

Abstract

The flexible storage bag (1) is formed by sewing a fabric web (2), where the fabric web provides a weakened region (10). A warp and weft threads are provided with a fabric web guide. The weakened region is provided with reduced warp thickness, which is thinner than the warp threads. The warp threads are made of polypropylene, polyester or polyethylene. An independent claim is also included for a method for creating a reinforced fabric edge of a fabric web.

Description

The invention relates to a flexible transport bag which is formed by sewing at least one fabric web, wherein the fabric web comprises an unattenuated region, as well as warp threads and weft threads and has a weakened region along at least one of the fabric web edges.

The invention further relates to a method for producing a reinforced fabric edge of a fabric web.

In the production of so-called "Big Bags" or "FIBC" (Flexible Intermediate Bulk Container) is generally used flexible textile fabric. Such textile fabric is known and can be produced on flat or round looms. Accordingly one speaks of flat fabric or round fabric. Fabric produced in this way has the well-known weave pattern in which weft threads and warp threads intersect again and again. However, the specific embodiment of the weaving method used is irrelevant to the present invention.

In the production of the above-mentioned transport bag fabric webs of said textile fabric must be sewn together. Taking into account that the transport bags are designed for a considerable load (for example, the use range is 1000 kg, with a safety of up to 5000 kg may be required), it is obvious that the used fabric webs at their edges a very high Resistance to tearing out of the fabric must have from the seam. For this reason, it is known to provide the textile fabric used with reinforced selvedges.

If the textile fabric is produced on a flat loom, it is known to form a so-called Sulzerkante. The weft threads are folded over in the edge region and inserted into the fabric formed. However, this is a costly and relatively slow process, moreover, flat weaving machines are generally more expensive than looms.

It is known to produce fabric webs in the desired width of round fabric by the round fabric is severed by a continuous longitudinal section. In this manufacturing process, all the weft threads of the round fabric are cut in a line. The production of a Sulzer edge is not possible in this case. In order to strengthen the resulting fabric edges, the fabric is folded over at the edge area and fastened with a seam or with ultrasound technology. However, this frequently used solution has several disadvantages. First, this process requires additional material, typically up to 8% of the fabric width, making production more expensive. Another problem arises when rolling up the fabric webs formed. Due to the doubling of the material thickness at the edges of the fabric webs, a step is formed which makes it difficult to handle the formed fabric web rolls.

The EP 1 514 962 A2 describes a method for producing a belt with warp threads and at least one weft thread, wherein a method step comprises the shrinkage of the warp threads in the middle region of the fabric. The EP 0 627 513 A1 further describes a fabric for reinforcing or reinforcing fabrics of weft and warp yarns which form open spaces with each other. A backing fabric attaches to an edge region in which the weft yarns and / or the warp yarns are reinforced. The purpose of this device is to mechanically strengthen the resulting fabric. Furthermore, the reveals DE 2 340 817 A1 a method of solidifying the fabric edges on fabrics with unattached weft ends. The above-mentioned step formation is not recognized in this document as a problem to be solved.

Another known approach is to weld the exposed warp threads and weft threads in the edge region by means of an ultrasonic welding device. However, it has been found that such a welded edge region does not have the required strength, and the supplied welding energy must be controlled very precisely in order to prevent damage to the fabric.

From the utility model AT 010 526 U1 Another solution is known. It describes how to remove or remove warp threads from the edge area during the production of the fabric, resulting in a weakened area. By cutting the fabric web along this area arise freely hanging weft threads, which are folded by appropriate devices on the unattenuated area and bonded to the already formed tissue or welded. As a result, a comparatively firm edge is achieved; and the step formation when rolling up the fabric web is significantly reduced.

However, it has been found that the edge regions formed in this way have a strength which is clearly below that of a sulzer edge. Moreover, the handling of freely hanging weft threads is problematic in practice.

It thus sets itself the task of producing a fabric web for a transport bag, which is formed on a round fabric machine by a continuous longitudinal section, and has an edge which on the one hand has a comparable strength with the known Sulzerkante, and on the other hand when rolling up the fabric web or only results in a small step formation.

This object is achieved in that in the weakened area warp threads are provided with reduced thickness, which are thinner than the warp threads in the unattenuated area.

Due to the fact that warp threads of reduced thickness are provided in the weakened area, the weakened area is significantly thinner than the unattenuated area. However, there are no fringes, as in the in AT 010526 described device, but the coherent tissue is retained. The weakened area is then partially or wholly bent over the unattenuated area and may be secured thereto by means of a hot melt adhesive, adhesive tape, coating or welding process such as heat welding, laser welding, or ultrasonic welding.

As mentioned, the weakened area can be completely or only partially bent over to the non-weakened area. If the entire weakened area is bent over to the unattenuated area, the resulting fabric edge is particularly robust. It forms, as in the known methods described, when rolling up the fabric web a step, however, is significantly thinner. Such step formation can be avoided by bending the weakened area only partially to the unattenuated area or, as discussed below Fig. 5 described, the weakened area is bent over on itself. In this case, no level is formed. For example, the weakened area has a width of 4 cm during weaving. The weakened area is centrally separated by a continuous longitudinal cut, creating at each edge a weakened edge area about 2 cm wide, which is completely turned over. The longitudinal section can also be made at any other point of the weakened area, for example, to obtain asymmetric selvedges, without departing from the scope of the invention. Typical dimensions of the reinforced fabric edge are in the range of 1 to 3 cm, with preferred widths of the fabric edges being about 1.5 cm to about 2.5 cm.

In order to prevent the material conveyed in the transport bag from coming into contact with the fabric or to protect the fabric from the goods being conveyed, it is provided according to the invention that the fabric web has a coating on at least one side, preferably on the inside of the transport bag covering the entire surface of the fabric web, including the reinforced fabric edge. According to the invention, it is provided in particular to apply this coating in the interior of the transport bag so that the pressure of the filled-in material does not release the coating from the fabric. A coating of the outside of the transport bag lends itself to protect the fabric from external influences. The coating can be made of a plastic, or in particular consist of the material of the fabric web to allow disposal of the transport bag together with the coating. Incidentally, the coating may be adapted to the particular application, for example, to have resistance to water, acids, or antistatic. Furthermore, the invention provides that the mentioned coating may have a projection over the edge of the fabric web to protect in particular the folded or bent edge region.

According to the invention it is further provided that the transport bag is produced by sewing the fabric webs, wherein the seam is formed in the unattenuated area outside of the reinforced fabric edges. According to the invention it is provided in particular that the seam is located about 17 mm to 25 mm from the outer edge of the fabric edge.

The inventively provided warp threads or weft threads are usually extruded or cut from films plastic tapes, which have a large width in cross-section in relation to their thickness, and are weaving technology processable. For example, these bands are made of polypropylene, polyester, or polyethylene. The warp threads used typically have a thickness of 50 μm to 200 μm, in particular 75 μm to 125 μm in the unattenuated area and about 25 μm to 75 μm, in particular 40 μm to 60 μm in the weakened area. Preferably, the thickness of the warp threads in the weakened region is about 50% of the thickness of the warp threads in the unattenuated region. The width of the warp threads is typically between 1.5 mm and 4 mm.

According to the invention, it is further provided that the warp threads with a reduced thickness in the weakened area can be wider than the warp threads in the unattenuated area. This provides the advantage that fewer coils must be equipped with the thinner warp threads, which in turn saves labor time. The density of the warp threads in the edge region can be, for example, 4 to 8 warp threads per centimeter, in particular 5 warp threads per centimeter.

The numbers mentioned are to be understood as guidelines and do not limit the scope of the present invention.

Further features of the invention can be taken from the claims, the description and the exemplary embodiments.

1. a) entlang mindestens eines geschwächten Bereichs der Gewebebahn Kettfäden mit reduzierter Dicke verwendet werden, welche dünner sind als die Kettfäden im ungeschwächten Bereich;
2. b) das Gewebe entlang des geschwächten Bereichs bevorzugt mittig aufgeschnitten wird; und
3. c) der geschwächte Bereich zum Teil oder bevorzugt zur Gänze auf den ungeschwächten Bereich umgebogen wird, wodurch eine verstärkte Gewebekante gebildet wird.

According to the invention, a method for producing a reinforced fabric edge of a fabric web is further provided, which is characterized in that

1. a) using, along at least one weakened region of the fabric web, warp threads of reduced thickness, which are thinner than the warp threads in the unattenuated area;
2. b) the tissue is preferably cut centrally along the weakened area; and
3. c) the weakened region is partially or preferably entirely bent over the unattenuated region, whereby a reinforced fabric edge is formed.

This method is used to produce the fabric webs of the transport bag described, but can also be used for the production of fabric webs with reinforced fabric edge for any other purpose.

The inventive method further includes that the weakened area is attached to the fabric web by means of hot melt, heat welding, ultrasonic welding or adhesive tape. As mentioned above, the longitudinal separation of the weakened area may be centered or at any other location to create symmetrical or asymmetric fabric edges. The weakening of the weakened area can be done in part or entirely on the unattenuated area, as a result of which the rolled-up fabric web has a more or less large step.

According to the invention it is further provided that in the method on at least one side of the fabric web a coating can be applied, which can cover the entire surface of the fabric web including the reinforced fabric edge, and may protrude in particular in the form of a protrusion over the edge of the fabric web. For example, the reinforced fabric edge has a width of 1 cm to 3 cm, preferably a width of 1.5 cm to 2.5 cm is used. This means in particular that the weakened area before cutting can typically have a width of 2 cm to 6 cm.

The warp threads used are usually made of polypropylene, polyester or polyethylene. They are typically about 50% thinner in the weakened region than in the non-weakened region, preferably using the thicknesses mentioned above.

The inventive method further provides that in the weakened area, the warp threads are made wider with reduced thickness than in the unattenuated Area. For example, 4 to 8, in particular 5 warp threads are provided with reduced thickness per centimeter in the weakened area.

The method according to the invention likewise comprises a transport bag, which is produced by the described method.

• Fig. 1 zeigt schematisch einen erfindungsgemäßen Transportsack in perspektivischer Ansicht,
• Fig. 2 zeigt schematisch eine erfindungsgemäße Gewebebahn vor dem Zerschneiden in perspektivischer Ansicht,
• Fig. 3 zeigt eine erfindungsgemäße Gewebebahn nach dem Umbiegen des geschwächten Bereichs in perspektivischer Ansicht,
• Fig. 4 zeigt einen Querschnitt durch eine erfindungsgemäße Gewebebahn nach einem ersten Ausführungsbeispiel,
• Fig. 5 zeigt einen Querschnitt durch eine erfindungsgemäße Gewebebahn nach einem zweiten Ausführungsbeispiel,
• Fig. 6 bis Fig. 8 zeigen Querschnitte durch eine erfindungsgemäße Gewebebahn nach dem Ausführungsbeispiel von Fig. 4.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the following drawings:

• Fig. 1 schematically shows a transport bag according to the invention in a perspective view,
• Fig. 2 schematically shows a fabric web according to the invention before cutting in perspective view,
• Fig. 3 shows a fabric web according to the invention after bending over the weakened region in a perspective view,
• Fig. 4 shows a cross section through a fabric web according to the invention according to a first embodiment,
• Fig. 5 shows a cross section through a fabric web according to the invention according to a second embodiment,
• Fig. 6 to Fig. 8 show cross sections through a fabric web according to the invention according to the embodiment of Fig. 4 ,

Fig. 1 shows a first embodiment of a erfindungemäßen transport bag 1 in a perspective view, the figure is purely schematic, and other features of the transport bag, such as straps or inserts are not shown for ease of illustration. The transport bag 1 comprises a plurality of fabric webs 2, which are sewn together at their edges with a seam 9. The fabric web 2 has an unattenuated area 10 and a reinforced fabric edge 5. In the present embodiment, it can be clearly seen that the seam 9, in favor of a higher strength of the connection, outside the reinforced fabric edge 5 in the unattenuated area 10 extends. However, embodiments are also possible where the seam runs in the reinforced fabric edge. The in Fig. 1 shown transport bag is characterized by the sewing of four fabric webs. However, the present invention is not limited thereto and also includes embodiments comprising any number of fabric webs.

Fig. 2 shows a perspective view of the fabric web, as it is formed immediately after its preparation on a loom. The representation is purely schematic and the size ratios are heavily oversubscribed. The tubular fabric web 2 has an unattenuated area 10 and a weakened area 6, which results from the use of thinner warp threads. After weaving, the fabric web 2 is severed longitudinally along a cutting line 11 to obtain a flat web of fabric. In the present embodiment, this longitudinal section along the section line 11 is centered in the weakened area 6. However, embodiments are also conceivable in which the section extends at a different location within the weakened area 6, or in which the fabric webs are cut at several points. In any case, the longitudinal section must run within the weakened region 6 in order to obtain the advantages of the device according to the invention and the method according to the invention described above.

Fig. 3 shows a perspective view of the fabric web 2. The fabric web 2 comprises an unattenuated area 10 and, on the unattenuated area bent weakened area 6. The bent portion forms the reinforced fabric edge 5. The fabric web 2 comprises warp threads 3 and weft threads 4, which Form weave pattern. The specific embodiment of the weave pattern is not relevant to the present invention. In the weakened region 6, the warp threads of reduced thickness 7 are used instead of the warp threads 3. For this reason, the weakened region 6 has a significantly reduced thickness, as in FIG Fig. 3 is apparent.

Fig. 4 shows a further embodiment of a fabric web 2 according to the invention in cross section along a weft thread 4. The fabric web 2 comprises Warp yarns 3, weft yarns 4 and warp yarns 7 of reduced thickness 7. The fabric web 2 may further be divided into the non-weakened region 10, the weakened region 6 and the reinforced fabric edge 5 formed by folding the weakened region 6 onto the weakened region 10. It should be noted that in the embodiment of Fig. 4 the weakened area 6 is completely turned over to the unattenuated area 10. The fabric web 2 further comprises a coating 8, which is attached to the top of the fabric web 2. Furthermore, the embodiment of the invention has a projection 12 of the coating 8. Special attention must be paid to the warp threads with a reduced thickness 7, which is about 50% thinner than the warp threads in the weakened area 10 are executed. The weakened region 6 may be attached to the non-weakened region 10 by means of an adhesive, an adhesive film with the coating, or a welding process.

Fig. 5 shows a further inventive embodiment of a fabric web 2 in cross-section along a weft thread 4, which has warp threads 3, weft threads 4, and warp threads of reduced thickness 7. In this example too, the fabric web 2 comprises an unattenuated region 10 and a weakened region 6, by means of which the reinforced fabric edge 5 is formed by bending over it. In contrast to the embodiment of Fig. 4 However, in this embodiment, the bending of the weakened area is not on the unattenuated area 10. Rather, the weakened area 6 is bent centrally on itself. This has the consequence that the reinforced fabric edge is only slightly thicker than the non-weakened region 10, whereby after application of the coating 8 virtually no step formation occurs. It should also be noted that in this embodiment, the coating 8 is formed without projection on the fabric edge 5.

The FIGS. 6 to 8 show in detail how the reinforced fabric edge 5 is formed, on the basis of the cross section of an embodiment according to the invention the fabric web 2 along a weft thread 4. Starting from a fabric web 2 in Fig. 6 which has warp threads 3, weft threads 4 and warp threads of reduced thickness 7 in a weakened area 6 is obtained by bending the weakened area 6 and fixing it on the weakened area 10 in FIG Fig. 7 of the State in Fig. 8 reached, in which the reinforced fabric edge 5 is formed, which is formed by turning the weakened area 6 on the unattenuated area 10. Subsequently, the fabric web 2 can be provided on at least one of its sides with a coating, as in 4 and FIG. 5 was shown.

However, the present invention is not limited to the embodiments of fabric sheets for transport sacks shown in the figures, but also includes fabric sheets for any other purposes, as long as they have the described reinforced fabric edge. Also, the validity of the invention is not limited to the discussed dimensions of the warp threads or wefts used. Furthermore, the invention is not limited to stitched transport bags, but also includes structures formed of fabric webs, which are connected to each other in any other way, as long as the described reinforced fabric edge is used.

LIST OF REFERENCE NUMBERS

1

transport bag

2

fabric web

3

warp

4

wefts

5

Reinforced fabric edge

6

Weakened area

7

Warp threads of reduced thickness

8th

coating

9

seam

10

Unprotected area

11

intersection

12

Got over

Claims (24)

Flexible transport bag (1), which is formed by sewing at least one fabric web (2), wherein the. Fabric web (2) an unweakened area (10) and warp threads (3) and weft threads (4) and along at least one of the fabric web edges over a weakened area (6), characterized in that in the weakened area (6) warp threads of reduced thickness (7) are provided, which are thinner than the warp threads (3) in the unattenuated area (10). Flexible transport bag according to claim 1, characterized in that the weakened region (6) of the fabric web (2) is partially or preferably entirely bent over the non-weakened region (10) and forms a reinforced fabric edge (5). Flexible transport bag according to claim 1 or 2, characterized in that the weakened region (6) of the fabric web (2) at the non-weakened region (10) by means of hot melt, heat welding, ultrasonic welding or adhesive tape is attached. Flexible transport bag according to claim 2 or 3, characterized in that the fabric web (2) on at least one side, preferably on the inside of the transport bag, a coating (8) which covers the entire surface of the fabric web including the reinforced fabric edge (5) , Flexible transport bag according to claim 4, characterized in that the coating (8) protrudes in the form of a projection (12) over the edge of the fabric web (2). Flexible transport bag according to one of claims 2 to 5, characterized in that the reinforced fabric edge (5) has a width of 1 cm to 3 cm, preferably 1.5 cm to 2.5 cm. Flexible transport bag according to one of claims 2 to 6, characterized in that the fabric webs are sewn with a seam (9), wherein the seam in the unattenuated region (10) outside the reinforced fabric edge (5) is formed. Flexible transport bag according to claim 7, characterized in that the seam (9) 17 mm to 25 mm from the outer edge of the fabric edge is executed. Flexible transport bag according to one of claims 1 to 8, characterized in that the warp threads (3), the weft threads (4) and / or the warp threads of reduced thickness (7) are made of polypropylene, polyester or polyethylene. Flexible transport bag according to one of claims 1 to 9, characterized in that the warp threads (3) in the unattenuated region (10) has a thickness of 50 μm to 200 μm, preferably 75 μm to 125 μm, and the warp threads have a reduced thickness (7). in the weakened region (6) has a thickness of 25 μm to 75 μm, preferably 40 μm to 60 μm. Flexible transport bag according to one of claims 1 to 10, characterized in that the warp threads of reduced thickness (7) in the weakened area (6) are wider than the warp threads (3) in the unattenuated area (10). Flexible transport bag according to one of claims 1 to 11, characterized in that in the weakened region (6) per centimeter 4 to 8, preferably 5, warp threads of reduced thickness (7) are provided. Flexible transport bag according to one of claims 1 to 12, characterized in that the warp threads with reduced thickness (7) are made about 50% thinner than the warp threads (3) in the unattenuated area (10). Method for producing a reinforced fabric edge (5) of a fabric web (2), characterized in that a. along at least one weakened region (6) of the fabric web (2), warp threads of reduced thickness (7) are used which are thinner than the warp threads (3) in the weakened region (10), b. the tissue along the weakened region (6) is preferably cut open in the middle, c. and the weakened region (6) is partially or preferably entirely bent over the weakened region (10), thereby forming the reinforced fabric edge (5). A method according to claim 14, characterized in that the weakened areas (6) on the fabric web (2) by means of hot melt adhesive, heat welding, ultrasonic welding or adhesive tape is attached. A method according to claim 14 or 15, characterized in that the fabric web (2) is provided on at least one side with a coating (8) which covers the entire surface of the fabric web including the reinforced fabric edge (5). Method according to one of claims 14 to 16, characterized in that the coating (8) in the form of a projection (12) over the edge of the fabric web (2) is carried out protruding. Method according to one of claims 14 to 17, characterized in that the reinforced fabric edge (5) has a width of 1 cm to 3 cm, preferably 1.5 cm to 2.5 cm, comprising running. Method according to one of claims 14 to 18, characterized in that the warp threads (3) and / or the warp threads of reduced thickness (7) are made of polypropylene, polyester or polyethylene. Method according to one of claims 14 to 19, characterized in that the warp threads (3) in the unattenuated region (10) have a thickness of 50 μm to 200 μm, preferably 75 μm to 125 μm, and the warp threads have a reduced thickness (7) in the Weakened region (6) has a thickness of 25 .mu.m to 75 .mu.m, preferably 40 .mu.m to 60 .mu.m. Method according to one of claims 14 to 20, characterized in that the warp threads of reduced thickness (7) in the weakened region (6) are made wider than the warp threads (3) in the weakened region (10). Method according to one of claims 14 to 21, characterized in that in the weakened region (6) per centimeter 4 to 8, preferably 5, warp threads of reduced thickness (7) are provided. Method according to one of claims 14 to 22, characterized in that the warp threads with reduced thickness (7) in the weakened area (6) are made about 50% thinner than the warp threads (3) in the weakened area (10). Flexible transport bag which is produced according to one of the methods 14 to 23.

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