DEVICE FOR EXTENDING A FILM AND FOR WELDING THE FILM TO A CONNECTION PART HAVING AN AXIAL DIRECTION, AND METHOD, PRODUCTION METHOD, SYSTEM, AND BAG

Abstract

The invention relates to a device for welding a connection region of a film to a connection part having an axial direction. In the case of conventional devices, there is the risk of steep workpiece edges causing uncontrolled weak spots in the film and in the weld seam. According to the invention, the film is extended in a controlled manner such that the film has a length reserve. The film is extended in such a way that the film has a deformation cross-section that runs out such that the deformation is not visible on the final product. In this connection, the invention further relates to a use of a film, to a method for welding, to a method for producing bags, to a system for producing bags, and to a bag.

Claims

1. A device for extending a film and for welding the film with an axial direction comprising connecting part, for forming a bag for medical purposes, with an extension device for extending the film inside and/or outside a connection region of the film, wherein the extension device comprises a deformation tool with an extension direction and with a deformation cross-section, characterized in that the extension device comprises an area with an in extension direction running out deformation cross section.

2. Device according to claim 1, characterized in that the extension device is arranged in a tool pass so the device can cause the extension of the film temporal before welding.

3. Device according to claim 1, characterized in that the deformation tool is adapted to create a waveform in the film in an area of the deformation tool.

4. Apparatus according to claim 3, characterized in that the deformation tool is adapted to generate the waveform in a sinusoidal shape.

5. Device according to claim 1, characterized in that the deformation tool is adapted to create a symmetrical deformation cross-section.

6. Device according to claim 1, characterized that the deformation tool is adapted to provide an asymmetrical deforming cross-section.

7. Device according to claim 1, characterized in that the deformation tool is adapted in a region of the deformation tool to create a length reserve in the film, which is dimensioned between two fixed points of the film at least with a half winding of the connection region, in particular the complete winding of the connection region.

8. Device according to claim 1, characterized in that the extension device comprises a foil heater.

9. Device according to claim 1, characterized in that the extension device has a heated deformation tool.

10. Device according to claim 1, characterized in that the extension device has a radiation heater.

11. Device according to claim 1, characterized in that that the extension device is a transport device for a continuous film belt and/or has a turntable.

12. Device according to claim 1, characterized in that that the extension device and a welding device are arranged at a station.

13. Device according to claim 1, characterized in that the extension device and the welding device are arranged at a combined tool.

14. Device according to claim 1, characterized in that the extension device and the welding device are arranged on separate stations.

15. Device according to claim 1, characterized that the extension device is arranged so that it causes an extension of the film between two connection regions.

16. A method for welding a connection region area of a film with a an axial direction having connecting part with a device according to claim 1, wherein the film is first extended and then the connection region is welded with one an axial direction having connecting part.

17. Manufacturing method for bags for use for medical purposes by means of welding two foils with a an axial direction having connecting part to a bag, wherein the in axis direction having connecting part is welded in a connection region between the films, wherein the method is characterized by the following steps: (a) deforming a first foil with a deformation tool inside and/or outside the connection region, in particular with a device according to claim 1, wherein the deformation tool has a first deformation cross-section, (b) deforming a second film with a deformation tool inside and/or outside the connection region, in particular with a device according to claim 1, wherein the deformation tool comprises a second deformation cross section, wherein the second deformation cross section is different from the first deformation cross section, and (c) welding the first foil, the second foil and the an axial direction having connecting part to a bag.

18. Manufacturing method for bags for medical use using a device according to claim 1, for reducing a cross-necking of the bag in filled condition.

19. Plant for producing bags of two films with one between the film welded, an axial direction having a connecting part, characterized in that the plant comprises a device according to claim 1.

20. Bag made of two films and one an axial direction having connecting part by means of a device according to claim 1.

Description

[0152] The invention will be described below with reference to an exemplary embodiment explained in detail on the drawing. There shows:

[0153] FIG. 1 shows schematically a deformation tool with symmetrical deformation cross-section,

[0154] FIG. 2 is a schematic view of a deformation tool with asymmetric deformation cross-section,

[0155] FIG. 3 shows schematically a bag for medical purposes with two connecting parts, and

[0156] FIG. 4 shows schematically a bag for medical purposes with a connecting part.

[0157] The deformation tool 1 in FIG. 1 has a plane 2 and a deformation region 3.

[0158] The deformation tool 1 has an extension direction 4 which coincides with the axial direction (not shown) of the later to be welded connection part (not shown).

[0159] The deformation tool 1 has a first region 5 with an in extension direction of 4 of the deformation tool 1 constant remaining symmetrical deformation cross-section 6 and a second region 7, in which the deformation cross-section 6 runs out in the plane 2.

[0160] The plane 2 can in an advantageous embodiment coincide at the end of the deformation offset (not shown) with the film plane (not shown).

[0161] The deformation cross-section 6 of the deformation tool 1 is wave-shaped and sinusoidal.

[0162] The deformation tool 11 in FIG. 2 has a plane 12 and a deformation region 13.

[0163] The deformation tool 11 has an extension direction 14 that coincides with the axial direction (not shown) of the later to be welded connecting part (not shown).

[0164] 14 of the deformation tool 11 constant remaining asymmetric deformation cross-section 16 and a second region 17, in which the deformation cross-section 16 runs out in the plane 12.

[0165] The plane 12 may coincide in an advantageous embodiment at the end of the deformation offset (not shown) with the film plane (not shown).

[0166] The deformation cross-section 16 of the deformation tool 11 is wave-shaped.

[0167] The bag 20 in FIG. 3 consists essentially of a reservoir 21, a first connecting part 22 and a second connecting part 23.

[0168] The reservoir 21 consists of a first film (not marked), a second film (not marked), the first connecting part 22 and the second connecting part 23.

[0169] The reservoir 21 has a surrounding weld line 24, which extends also on both sides over the first connecting part 22 and the second connecting part 23.

[0170] The upper end of the bag 20 has a cutout 25 which is used for the purpose to fix the bag 20.

[0171] The bag 20 has following the first connecting part 22 and the second connecting part 23, extending to the centre of the bag (not marked), in each case a deformation 26,27 of the first film (not marked) and the second film (not marked) opposite to the bag plane (not marked).

[0172] The first connecting part 22 and the second connecting part 23 have a cylindrical shape.

[0173] The first connector 22 and the second connector 23, each, have an access point 28, 29, via which the bag 20 can be filled and/or be emptied.

[0174] The bag 30 in FIG. 4 consists essentially of a reservoir 31 and a connecting part 32.

[0175] The connecting part 32 could be produced, in a particularly preferred embodiment by injection molding.

[0176] The reservoir 31 consists of a first film (not marked), a second film (not marked) and the connecting part 32.

[0177] The reservoir 31 has a surrounding weld line 33, which also extends on both sides over the connecting part 32.

[0178] The upper end of the bag 30 has a cutout 34 which is used to fix the bag 30.

[0179] The connecting part 32 has a first access point 35 to the reservoir 31 of the bag 30 and a second access point 36 to the reservoir 31 of the bag 30 via which the bag 30 can be filled and/or be emptied.

[0180] The bag 30 has, following the connecting part 32, extending to the bag centre (not marked), a deformation 37, each, of the first film (not marked) and the second film (not marked) opposite the bag plane (not marked).

LIST OF REFERENCE NUMBERS USED

[0181] 1 deformation tool [0182] 2 plane [0183] 3 deformation region [0184] 4 extension direction [0185] 5 first region [0186] 6 deformation cross section [0187] 7 second region [0188] 11 deformation tool [0189] 12 plane [0190] 13 deformation region [0191] 14 extension direction [0192] 15 first region [0193] 16 deformation cross-section [0194] 17 second region [0195] 20 bags [0196] 21 reservoir [0197] 22 connection piece [0198] 23 connecting part [0199] 24 welding line [0200] 25 cutout [0201] 26 deformation [0202] 27 deformation [0203] 28 access point [0204] 29 access point [0205] 30 bags [0206] 31 reservoir [0207] 32 connecting part [0208] 33 welding line [0209] 34 cutout [0210] 35 access point [0211] 36 access point [0212] 37 deformation