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 method of manufacturing a medical bag comprising: providing a deformation tool comprising: a first region comprised of a deformation region having a wave-shaped cross section; and a second region, wherein the deformation region tapers into a plane as the deformation region extends from the first region to the second region; deforming a first connection region of a film with the deformation region of the deformation tool; deforming a second connection region of the film with the deformation region of the deformation tool; placing the first connection region on a connecting part; placing the second connection region on an opposite side of the connecting part; welding the first connection region and the second connection region to the connecting part in an axial direction of the connecting part; and welding edges of the film together to seal the medical bag.

2. The method of claim 1, wherein prior to deforming a first connection region of a film with the deformation tool, the method further comprising lengthening the film with an extension device.

3. The method of claim 2, wherein prior to placing the first connection region on a connecting part, the method further comprising cooling the first connection region and the second connection region of the film.

4. The method of claim 1, wherein the deformation region is symmetric.

5. The method of claim 1, wherein the deformation region is asymmetric.

6. The method of claim 1, wherein the film is comprised of a first film including the first connection region and a second film including the second connection region.

7. A method of manufacturing a medical bag comprising: providing a deformation tool comprising: a first deformation region having a first cross section; and a second deformation region on an opposite side of the deformation tool as the first deformation region, the second deformation region having a second cross section that differs from the first cross section; deforming a first connection region of a film with the first deformation region of the deformation tool; deforming a second connection region of the film with the second deformation region of the deformation tool; placing the first connection region on a connecting part; placing the second connection region on an opposite side of the connecting part; welding the first connection region and the second connection region to the connecting part in an axial direction of the connecting part; and welding edges of the film together to seal the medical bag.

8. The method of claim 7, wherein prior to deforming a first connection region of a film with the deformation tool, the method further comprising lengthening the film with an extension device.

9. The method of claim 8, wherein prior to placing the first connection region on a connecting part, the method further comprising cooling the first connection region and the second connection region of the film.

10. The method of claim 7, wherein the first deformation region is symmetric.

11. The method of claim 7, wherein the first deformation region is asymmetric.

12. The method of claim 7, wherein the film is comprised of a first film including the first connection region and a second film including the second connection region.

Description

[0154] The invention will be described below with reference to an exemplary embodiment explained in detail on the drawing. There shows:

[0155] FIG. 1 shows schematically a deformation tool with symmetrical deformation cross-section,

[0156] FIG. 2 is a schematic view of a deformation tool with asymmetric deformation cross-section,

[0157] FIG. 3 shows schematically a bag for medical purposes with two connecting parts, and

[0158] FIG. 4 shows schematically a bag for medical purposes with a connecting part.

[0159] The deformation tool 1 in FIG. 1 has a plane 2 and a deformation region 3.

[0160] 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).

[0161] 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.

[0162] The plane 2 can in an advantageous embodiment coincide at the end of the deformation offset (not shown) with the film plane (not shown).

[0163] The deformation cross-section 6 of the deformation tool 1 is wave-shaped and sinusoidal.

[0164] The deformation tool 11 in FIG. 2 has a plane 12 and a deformation region 13.

[0165] 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).

[0166] 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.

[0167] The plane 12 may coincide in an advantageous embodiment at the end of the deformation offset (not shown) with the film plane (not shown).

[0168] The deformation cross-section 16 of the deformation tool 11 is wave-shaped.

[0169] The bag 20 in FIG. 3 consists essentially of a reservoir 21, a first connecting part 22 and a second connecting part 23.

[0170] 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.

[0171] 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.

[0172] The upper end of the bag 20 has a cutout 25 which is used for the purpose to fix the bag 20.

[0173] 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).

[0174] The first connecting part 22 and the second connecting part 23 have a cylindrical shape.

[0175] 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.

[0176] The bag 30 in FIG. 4 consists essentially of a reservoir 31 and a connecting part 32.

[0177] The connecting part 32 could be produced, in a particularly preferred embodiment by injection molding.

[0178] The reservoir 31 consists of a first film (not marked), a second film (not marked) and the connecting part 32.

[0179] The reservoir 31 has a surrounding weld line 33, which also extends on both sides over the connecting part 32.

[0180] The upper end of the bag 30 has a cutout 34 which is used to fix the bag 30.

[0181] 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.

[0182] 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

[0183] 1 deformation tool [0184] 2 plane [0185] 3 deformation region [0186] 4 extension direction [0187] 5 first region [0188] 6 deformation cross section [0189] 7 second region [0190] 11 deformation tool [0191] 12 plane [0192] 13 deformation region [0193] 14 extension direction [0194] 15 first region [0195] 16 deformation cross-section [0196] 17 second region [0197] 20 bags [0198] 21 reservoir [0199] 22 connection piece [0200] 23 connecting part [0201] 24 welding line [0202] 25 cutout [0203] 26 deformation [0204] 27 deformation [0205] 28 access point [0206] 29 access point [0207] 30 bags [0208] 31 reservoir [0209] 32 connecting part [0210] 33 welding line [0211] 34 cutout [0212] 35 access point [0213] 36 access point [0214] 37 deformation