WO2015010145A1

WO2015010145A1 - Method and device for producing sacks from a fabric

Info

Publication number: WO2015010145A1
Application number: PCT/AT2014/000149
Authority: WO
Inventors: Herwig Worff
Original assignee: Herwig Worff
Priority date: 2013-07-26
Filing date: 2014-07-25
Publication date: 2015-01-29
Also published as: AT514545A4; BR112016001731A2; EP3024625A1; CN105555493B; AT514545B1; BR112016001731B1; EP3024625B1; CN105555493A

Abstract

The invention relates to a method for producing sacks from a fabric, wherein a flat fabric tube (1) is provided, which comprises a sack front wall (18) and a sack rear wall (19), which lie flat on each other, wherein the flat fabric tube (1) is fed to a cutting device, in which the fabric tube (1) is cut to length in order to obtain individual tube-shaped sack bodies (20), whereupon the tube-shaped sack bodies (20) are closed at at least one open end (27) by folding over an end section of the fabric, wherein the fabric tube (1) is cut to length in a longitudinal transport section (3), in which the fabric tube (1) or the tube-shaped sack bodies (20) are transported in the longitudinal direction (2) of the fabric tube (1), and the sack body (20) is preferably closed in a transverse transport step (24), in which the sack bodies (20) are transported in a transport direction (25) running transversely to the longitudinal direction thereof. The sack bodies (20) are closed by folding over a tab (23) formed from the sack rear wall (19) after the tab (23) has been exposed by cutting out a section (22) of the sack front wall (18) in the longitudinal transport section (3).

Description

Method and device for producing sacks from a fabric

The invention relates to a method for the production of sacks from a fabric, in which a flat fabric tube is provided, which has a sack front wall and a

Sack back wall comprises, which lie flat on each other, and the flat fabric tube is fed to a cutting device in which the fabric tube is cut to order. to obtain individual tubular bag body, whereupon the tubular bag body are closed at at least one open end by turning over an end portion of the fabric, wherein the cutting of the fabric tube is carried out in a longitudinal transport step, in which

Fabric tube or the tubular bag body to be transported in the longitudinal direction of the fabric tube, and the closure of the bag body preferably in one. Cross transport section takes place in which the bag body in a direction transverse to its longitudinal direction

Transport direction to be transported.

The invention further relates to a device for

Implementation of this procedure.

The tubular body of a bag is usually formed from a tubular material or a tube connected to a flat material. A rough classification of such bags is made by the distinction in pillow and box shape. A pillow form of sacks usually arises by assembling the floors with a textile seam or a weld. The tissue consists preferably of monoaxial

stretched polymer, in particular polyolefin or

Polypropylene tapes. These tapes are made by stretching polymer, in particular polyolefin or

Polypropylene films usually on the four- to

produced ten times, whereby the molecular chains in

Ribbon longitudinal direction are aligned and in these directions about six to ten times strength

towards the original film. The

Ribbon width is usually about 1.5 to 10 mm, the thickness 20 to 80 μπι.

A method and a device of the type mentioned are known for example from WO 2010/086232 AI. As a rule, such a device initially comprises a hose-forming device for the production and

Provision of a tubular material. It may also be present only a Schlauchabwickelvorrichtung. This is usually equipped with a material wrap on which tubular material is wound. From this material wrap the material is usually withdrawn continuously in the longitudinal direction. At the

The bag making process of the prior art machines is that provided by the tube forming apparatus or by the tube unwinding apparatus

Fabric tube fed to a cross-cutting device, the fabric hose into individual pieces of hose or

isolated tubular bag bodies. The tubular bag bodies are transferred to a transport device. With the aid of this transport device, a change in the transport direction of one usually takes place

Longitudinal transport, in which the hose or the

Hose pieces transported in the direction of their longitudinal axes were, in a transverse transport, in which the hose pieces are now no longer transported in the direction of its tube longitudinal axis, but transversely thereto, so that

at least one end of the hose pieces for at least one-sided closing of the bag or for producing a sack bottom are laterally accessible. The

original and the new transport direction of the hose or the hose piece are usually

perpendicular to each other. The at least one-sided

Closing the bag is done for example by

Applying a seam in the transverse direction of the bag. Alternatively, a bottom fold may be made to obtain a rectangular bottom. In the case of a textile seam with a needle, the circumstance is disadvantageous that the bag contents may escape via the seam perforations. In addition, the seam perforation of the fabric causes weaknesses, so that the sack can tear at the seam. In addition, the machine creation of the textile seam with needle is associated with a number of problems, such as

Risk of needle breakage and tearing of the thread used for the seam. Another disadvantage is the limited sewing speed of the sewing head, so that with currently available machines a

Processing of only about a maximum of 40 to 55 bags per minute is possible. Furthermore, the result of the textile seam is a product which consists of two different materials, namely the material of the fabric and the material of the sewing thread. This complicates the recycling of used bags. Finally, it is disadvantageous that the sewing operation requires a high material cost (sewing thread). The invention therefore aims to make the bag closure such that the material of the bag is weakened by the closure as little as possible, so that the closed bag even under high mechanical

Strains especially in the area of the closure does not tear. In addition, a significantly higher throughput rate is to be made possible in comparison to the production of a conventional sewn closure seam. Furthermore, the process reliability is increased, the maintenance of the

Reduces machines, minimizes production costs and ensures the visual advantage of the product. Finally, the recycling should be simplified and the manufacturing costs are minimized. To solve this problem, the invention provides in a method of the type mentioned that the

Closing of the bag body by turning over a flap formed from the bag rear wall takes place after the tab in the longitudinal transport section by cutting a

Section of the sack front wall was exposed. The

Forming a tab allows a very simple and inexpensive connection of the folded tab with the bag body, wherein preferably a flat connection is made to maximize the holding forces. The fact that the tab was previously exposed, the tab

directly, i. without intermediate position of the

Sack front wall to be connected to the bag body. The exposure of the tab in this case includes the cutting away of a tissue section of the bag front wall, which would otherwise come to rest between the folded flap and the bag body. In this case, the process step of cutting the fabric tube and exposing the tab can be carried out in a single step, for example, by the two superimposed

Fabric layers of the fabric hose offset to be cut to length.

By the invention, the otherwise caused by sewing needles perforations are avoided, whereby the bag is much denser. Furthermore, this is one

Product loss as well as possible dust development avoided. In general, it should be noted that the terms sack front wall and sack rear wall do not limit the invention to the fact that the tab is formed from a specific wall. Rather, these terms merely serve to distinguish one of the two walls from the other wall.

The procedure according to the invention leads to a

Sack closure, which is extremely stable. In general, in the production of a bag closure, in particular by gluing or welding, the risk exists that a peel load acting on the connection, in which the

interconnected tissue layers are pulled apart in a direction transverse to the tissue surface, leading to a release of the compound. It should therefore be noted in principle that such a compound is only subjected to shear, i. only subjected to a load parallel to the tissue surface. This requirement is borne by the invention by imposing the tab, whereby the connection between the tab and the bag body is no longer exposed to any peel load, so that the connection can withstand even very high mechanical loads. This is especially the case if, like this one

preferred training corresponds, the folded flap only connected to the sack front wall. Around

especially in the case of a welded joint too

prevent the sack rear wall is welded together, a separating layer is advantageously inserted into the tubular bag body or applied a release layer. The separating layer preferably has a higher one

Thermal conductivity on as the sack tissue. The

Separating layer, in particular a metal-containing separating layer, is preferably applied by a coating method. The release layer used here is preferably a metal-containing paint. Such

Separation layer leads due to the metal content to heat dissipation, so that the sack rear wall is subject to a lower or substantially no heat input.

Alternatively, in the. Area of welded joint ^' one

Separating layer between the bag front wall and the bag rear wall are arranged. For example, the release liner may be an inboard, i. a arranged inside the tubular body, stationary tool, which spaced the front wall during the transverse transport of the bag body from the rear wall.

According to a preferred procedure, this includes

Exposing the tab to perform at least three, preferably four contiguous cuts. Preferably, a rectangle is cut out by the cuts, wherein two cuts are made along the side edges of the fabric tube. Preferably, two sections extend over the entire width of the fabric tube. The cuts are made in the longitudinal transport section, preferably on the tubular fabric. The cutting of the rectangle can be done before the cutting of the fabric tube, for example by punching a rectangle on the bag front wall or on the sack rear wall.

An alternative procedure provides that one of the cuts is produced by the cutting of the fabric tube. It is preferred in terms of the order of the individual sections that at least two

Cuts, preferably three cuts are made before cutting the fabric tube. When cutting the fabric tube thus takes the last cut that is required for the exposure of the tab.

For the cutting of the fabric basically any cutting method can be used, which is the

ΘiinΘs ch111 zes ensured in the tissue.

It is preferably provided here that at least one cut is made by pressing on a cutting tool,

in particular a hot knife is made against the outer surface of the fabric, wherein on the inner surface of the fabric by means of a arranged in the interior of the fabric tube counter-pressure is generated. The hot knife has a temperature, the

sufficient to locally melt or weaken the material of the fabric hose to such an extent that it can be slit by a small force.

To ensure that the bag after wrapping the flap is tight at the corners of the bag seal, in particular dust-tight, the flap is preferably folded so that even one of the tab adjacent, the bag front wall and the sack rear wall comprehensive area of the fabric tube is folded.

As already mentioned, the closing of the

Sack body prefers the connection of the folded flap with the bag front wall. Preference is given here to a cohesive connection. In particular, it does so

proceeded that the tab and the bag front wall are joined together by gluing and / or welding.

When joining can also proceed in such a way that in addition to the tab and an adjacent to the tab, the bag front wall and the sack rear wall comprehensive area of the fabric tube is at least partially mitverbunden, in particular mitverklebt. Gluing can

For example, be carried out as extrusion bonding. Extrusion bonding is particularly preferred because it does not require pretreatment such as e.g. Corona treatment of

Surface requires for the glue to hold. In addition, the extrusion bonding is inexpensive and it is a

produces a single-grade end product that is easily recyclable. The extrusion bonding requires a continuous

Order of the extrudate, resulting in the present

Invention is readily possible if the application of the extrudate and the closing of the bag body are preferably carried out in the transverse transport section. Extrusion bonding is a process in which a still emerging from an extruder, still (thick) liquid extrudate on the

Glue is applied and the together

bonding tissue areas are pressed together before hardening of the extrudate. The extrudate is preferably made of the same plastic as the fabric. The

Extrusion bonding allows secure bonding even when. uncoated fabric. In the case of a welding process, a

Hot contact welding or ultrasonic welding

be applied.

Furthermore, it is advantageous if the folded tab and the bag front wall are pressed after their connection to each other.

The closing of the bag body is carried out according to the invention in a transverse transport section, in which the bag body extending in a direction transverse to its longitudinal direction

Transport direction to be transported. Under the

The longitudinal direction of a bag body is understood to mean that direction parallel to the side edge of the bag body which connects the two open ends of the bag body. The method is carried out in a particularly advantageous and efficient manner when the folding over and if necessary connecting the tab during the transverse transport of the

Bag body occurs, i. while the bag body moves in the transport direction. In particular, the end portion of the bag body to be closed thereby moves past a stationary envelope, adhesive and arry back device. The invention is preferably used in sacks whose fabric consists of monoaxially stretched polymer, in particular polyolefin or polypropylene tapes. The fabric can basically be coated or uncoated. In the case of a coating, this preferably consists of the same polymer as the polymer ribbons. The coating can be made of a thin layer of polypropylene or a

Mixture of polypropylene and polyethylene. When using an extrusion bonding method for sealing the bag body can be easily processed even uncoated fabric.

To solve the problem underlying the invention, the invention further proposes a device for

Production of sacks from a fabric hose,

in particular for carrying out the inventive

Method, comprising a first cutting device, the a flat fabric tube in the longitudinal direction of the

And a Sackkörperverschließeinrichtung to which the tubular bag body can be fed, wherein at least one transport device is provided, which has a longitudinal transport section for transporting the fabric tube or the tubular bag body in the longitudinal direction of the Fabric hose and one

Transverse transport section for transporting the bag body in a direction transverse to its longitudinal direction

Transport direction, wherein the cutting device in the longitudinal transport section and the

Sackkörperverschließeinrichtung are arranged in the transverse transport section. According to the invention is in

Longitudinal transport section arranged a second cutting device, which is designed for cutting out a portion of a bag front wall for exposing a formed of the bag rear wall tab, and the

Sackkörperverschließeinrichtung comprises a

Covering device for folding over the flap.

A preferred development provides that the

Sack body closing means comprises means for connecting the folded flap with the bag front wall. The Connecting means may preferably be a welding or

Adhesive device include.

A preferred development provides that the second cutting device is assigned an internal tool against which a knife of the cutting device can be pressed. The internal tool is in this case arranged so that it is in operation inside the

tubular bag body comes to rest. the

internal tool can be preceded by means for spacing the superimposed layers of tissue of the flat tube of the bag body so that it does not come to collisions with the internal tool during transport of the tubular bag body.

A preferred embodiment provides that a

Heating device for heating the blade of the

Cutting device is provided. To the internal tool to any

To be able to adapt to variations in the width of the tubular fabric is not a preferred development

internal tool has adjustment means for adjusting its overall width. In particular, the internal tool has at least two plate-like

Tool elements, which have mutually sliding inclined surfaces to change the overall width of the tool.

To ensure that the internal tool always fills the entire available width, it is preferably provided that the adjustment means comprise at least one spring element, which is the plate-like Tool elements towards the maximum

Total tool width applied.

A further preferred embodiment provides that the second cutting device in the transport direction of the

Tubing fabric in front of the first cutting device

is arranged, whereby the cutting of the fabric tube by means of the first cutter at the same time the previously prepared by the second cutter by slitting the tissue section of the bag front wall is cut away.

The invention will be described below with reference to the

Drawing illustrated embodiment closer

explained. In this figure 1 shows a schematic

Top view of the device according to the invention, Figure 2 is a sectional view taken along the line II-II, Fig. 3 a

Detailed view of the internal tool, Fig. 4 shows a modified embodiment of the device, Fig. 5 shows two obtained by the apparatus of FIG. 4 tubular bag body, Fig. 6 and 7 an embodiment of

Seitenfalt.ensäcke, Fig. 8 shows a modified training for gusseted bags and Figs. 9 - 11 a further

modified embodiment of the invention.

In Fig. 1 it can be seen that a fabric hose 1 of the device in the direction of arrow 2 and supplied

is transported in the direction of arrow 2 within a longitudinal transport section 3 of the device. First, the fabric tube 1 is cut along the cutting lines 4, 5 and 6. The course of the cutting lines 4, 5 and 6 is shown in FIG. 1 dashed lines shown on the left, with the line 4 over the entire width of the tubular fabric. 1 extends and the lines 5 and 6 each extend along the edges 7 of the tubular fabric. The along the

Cutting lines 4, 5 and 6 are made by means of the cutting device 8 cuts. The

Cutting device 8 comprises an inboard, i.

between the fabric layers of the fabric tube 1 arranged tool comprising rollers 9 for spacing the fabric layers and the rollers 9 in the transport direction 2 downstream plate-shaped tool 10. The plate-shaped tool 10 serves as a counterpart for the externally acting on the tissue cutting blade. The along the

Cutting lines 5 and 6 acting cutting blades are designated 11. The along oer cutting line 4 acting

Cutting knife is designated 12 (Figure 2). The

Cutting blades 11 are heatable and according to the

Double Arrow 13 movably mounted to under

Interposition of the tissue on the plate-shaped

Tool 10 to be pressed. This will be in the

Tissue along the cutting lines 4, 5 and 6 cuts produced. The section produced along the cutting line 4 is designated 14 in a further forwardly transported section of the tubular fabric. The section 14 is in this case only in the upper fabric layer or the

Sack front wall 18 (Fig. 2) generated while the lower fabric layer or the bag rear wall 19 thereof remains unaffected. The lateral incisions produced along the cutting lines 5 and 6 are designated 15 and 16 in a further forwardly transported section of the tubular fabric.

At the position schematically indicated by 17, the tubular fabric 1 is cut to length by means of a further cutting device, not shown, to individual tubular 14000149

14

To obtain bag body 20. The cut runs along the designated 21 cutting line. When cutting along the line 21 falls by means of hatching

labeled tissue section 22 away. This

Tissue section can be recycled in the sequence by using an extruder for the production of

Tissue band is supplied.

By cutting away the tissue section 22, a tab 23 is now exposed, which is formed from the sack rear wall 19.

At the end of the longitudinal transport section 3 reach the

tubular bag body 20 in one

Cross transport section 24, in which they move in the direction of

Arrow 25 are transported. The bag body 20 in this case have open ends 26 and 27. in the

Transverse section, the tab 23 of the bag body 20 is now along the indicated with 28 fold line forward, i. on the visible in the drawing surface of the upper fabric layer or the bag front wall 18, turned over and with this surface, e.g. connected by gluing. It then follows the designated 29 state of the

Sack body 2.0.

In the sectional view of FIG. 2 is the

Cutting device 8 better visible. The

Cutting device 8 urafasst two rollers 9, by which the two fabric layers 18 and 19 of the fabric tube 1 are spaced apart. The cutting device 8 further comprises a subsequent in the transport direction 2 to the rollers 9 plate 10, which as a counterpart to the

Cutting knife 12 is formed. In Fig. 3, the plate-shaped tool 10 is shown in detail. The tool is designed as an internal tool and comprises two plate-like tool elements 30 and 31. The plate-like tool element 31 is

arranged stationary, whereas the plate-like

Tool element 30 in the direction of the double arrow 33rd

slidably guided. The two glide

plate-like tool elements on an inclined surface 34 to each other, so that in dependence on the

Relative position changes the overall width of the tool. A spring element 32 ensures that the two

plate-like tool elements 30 and 31 always cooperate with each other on the inclined surface 34. When the width of the tubular fabric 1 decreases, the friction of the fabric on the movable tool member 30 increases, so that it is taken along in the transport direction 2 until the width of the tool has adapted to the hose width. Conversely, the movable

Tool element 30 with increasing hose width by the spring member 32 is retracted again.

In the modified embodiment according to FIG. 4, the cutting device comprises a first cutting blade 12 and a second one arranged offset in the longitudinal direction

Cutting knife 35. The first cutting blade 12 cuts the bag front wall 18 along the cutting line 4 and the second cutting blade 35 snows the bag rear wall 19 along the cutting line 21. In addition, the cutting blade 11 analogous to the embodiment of FIG. 1, the lateral

Sections 15 and 16. Thereby, as shown in Fig. 5, two tubular bag body 20 is generated, and at the mutually facing open ends in each case a tab 23 is generated, wherein the one tab 23 on the bag front wall 18 and the other tab 23 is formed on the bag rear wall 19 , In this way, in contrast to the embodiment according to FIG. 1, no tissue section 22 is cut away and a corresponding loss of material is avoided. To the

To close the two open sack ends, either two separate closing devices can be used or every other tubular sack body 20 can be turned, so that a single closing device can be used. In Fig. 6 is a modified embodiment of the

Processing of gusseted bags shown. The

Gussets are designated 36 and are in the designated 38 area with each other and with the

Sack front wall 18 and the bag rear wall 19 is connected, in particular welded, to achieve a seal of the bag closure in Beriech the side folds. After welding, the tab 23 together with the welded areas 38 is folded over and connected to the bag body. In the cross-sectional view according to FIG. 7, stamps 37 of a welding device are shown, which serve to press together the fabric layers to be joined and to weld them together. Alternatively, it is possible to proceed as shown in FIG. 8. Here, when exposing the tab 23, the procedure is such that the side folds 36 are not cut during the production of the cut 14. Rather, be the gussets 36 cut in a separate section along the line 39, which is closer to the bag end than the cut 14. In this way, in the region of the tab 23 projecting portion of the

Side folds 36 are folded when folding the tab 23 along the line 28, so as to complete

To achieve sealing of the bag closure.

In Figs. 9-11, the production of a tab is shown without the use of an internal tool. 9 is a side view of a flat fabric tube 1 with two superposed fabric layers 18 and 19.

Be along the side edges of the fabric tube

first made cuts 15 and 16. This is clearly visible in particular in the plan view according to FIG. 10. Thereafter, the two fabric layers 18 and 19 are pushed together according to the arrows 40, so that the tissue in the region of the incisions 15,16 folds 41st

formed. It is proceeded so that the fold 41 of the fabric layer 18 and the fold 41 of the fabric layer 19 in

opposite directions are folded in order to subsequently in the region between the two folds 41, a cutting device 42 for severing the two

Fabric layers to be applied. The

Cutting device 42 preferably comprises two cutting blades, which can be pressed against the flat fabric hose from above and below, in order to cut through the fabric located between the cutting blades. By cutting the fabric tube is cut to one hand to obtain two bag body, and on the other hand at the two mutually facing end portions of the two bag body each exposed a tab, wherein after pulling apart the As a result, fabric layers (to remove the fold) result in a configuration as shown in FIG.

Claims

Claims:

A method of manufacturing sacks from a fabric comprising providing a flat fabric tube (1) comprising a sack front wall (18) and a sack back wall (19) lying flat on each other and the flat sack

Fabric tube (1) is supplied to a cutting device, in which the fabric tube (1) is cut to obtain individual tubular bag body (20), whereupon the tubular bag body (20) at least one open end (27) by turning a

End section of the fabric are closed, wherein the cutting of the fabric tube (1) in one

Longitudinal transport step (3) takes place in which the

Fabric hose (1) or the tubular bag body

(20) in the longitudinal direction of the fabric tube (1)

be transported, and closing the sac

(20) is preferably carried out in a transverse transport section (24), in which the bag body (20) in a transversely extending to its longitudinal direction Transporttrichtung (25)

be transported, characterized in that the closing of the bag body (20) by folding a bag back wall (19) formed tab (23) takes place after the tab (23) in the longitudinal transport section (3) by cutting out a portion (22) of the bag front wall

(18) was uncovered.

2. The method according to claim 1, characterized in that the exposure of the tab (23) comprises the passage of at least three adjacent sections (4,5,6).

3. The method according to claim 2, characterized in that one of the cuts by the cutting to length of

Fabric tube (1) is generated.

4. The method according to claim 2 or 3, characterized

in that at least two cuts (5, 6) are made before cutting the fabric tube (1) to length.

5. The method of claim 2, 3 or 4, characterized

characterized in that at least one cut (4) through

Pressing a cutting tool, in particular a hot knife (12) takes place against the outer surface of the fabric, wherein on the inner surface of the fabric by means of a in the interior of the fabric tube (1) arranged counterpart (10), a back pressure is generated.

6. The method according to any one of claims 1 to 5, characterized in that the folding of the tab (23) takes place so that a to the tab (23) adjacent, the bag front wall (18) and the bag rear wall (19) comprehensive area of Fabric tube (1) is handled.

7. The method according to any one of claims 1 to 6, characterized in that the closing of the bag body (20) comprises the connection of the folded flap (23) with the bag front wall (18).

8. The method according to claim 7, characterized in that the tab (23) and the bag front wall (18) are joined together by gluing and / or welding.

9. The method according to claim 7 or 8, characterized

characterized in that the folded flap (23) and the Sack front wall (18) are pressed after their connection to each other.

10. The method according to any one of claims 1 to 9, characterized in that the folding and possibly connecting the tab (23) during the transverse transport of the bag body (20).

11. The method according to any one of claims 1 to 10, characterized in that the fabric of monoaxially stretched

Polymer, in particular polyolefin or

Polypropylene ribbon exists.

12. Apparatus for producing bags from a

Fabric hose, in particular for carrying out the

Method according to one of claims 1 to 11, comprising a first cutting device which is a flatter

Fabric hose (1) in the longitudinal direction (2) of the fabric hose

(1) can be fed and by the cutting to length of

Cloth tube (1) obtained tubular bag body

(20) are wegführbar, and a

Sackkörperverschließeinrichtung to which the tubular bag body (20) can be supplied, wherein further at least one TranSporteinrichtung is provided, the one

Longitudinal transport section (3) for transporting the

Fabric tube (1) or the tubular bag body (20) in the longitudinal direction (2) of the fabric tube (1) and a transverse transport section (24) for transporting the bag body (20) in a direction transverse to its longitudinal direction of transport (25), wherein the

Cutting device in the longitudinal transport section (3) and the Sackkörperverschließeinrichtung in the transverse transport section (24) are arranged, characterized in that in Longitudinal transport section (3) a second cutting device (11,12) is arranged, which for cutting out a

Section (22) of a bag front wall (18) for exposing a bag back wall (19) formed tab (23) is formed, and that the

Sackkörperverschließeinrichtung comprises an envelope for handling the flap (23).

13. The apparatus according to claim 12, characterized in that the Sackkörperverschließeinrichtung means for

Connecting the folded tab (23) with the

Sack front wall (18) includes.

14. The apparatus according to claim 13, characterized in that the connecting means is a welding or

Adhesive device include.

15. The apparatus of claim 12, 13 or 14, characterized in that the second cutting device (11, 12) is associated with an internal tool (10) against which a knife (12) of the cutting device can be pressed.

16. The apparatus according to claim 15, characterized in that a heating device is provided for heating the blade of the cutting device.

17. The apparatus of claim 15 or 16, characterized

characterized in that the internal tool (10)

Having adjustment means for adjusting its overall width.

18. The apparatus according to claim 17, characterized in that the inner tool (10) has at least two plate-like tool elements (30,31), which have to change the overall width of the tool to each other sliding inclined surfaces (34).

19. The apparatus of claim 17 or 18, characterized

characterized in that the adjustment means comprise at least one spring element (32), which acts on the plate-like tool elements (30, 31) in the direction of the maximum overall tool width.

20. Device according to one of claims 12 to 19, characterized in that the first cutting device is arranged in the transport direction of the tubular fabric (1) in front of the second cutting device.