Pulse welding method and welding tool for pulse welding for a medical pack formed as a bag
The invention relates to a welding tool and a method for pulse welding films of plastic for medical packs formed as bags. The invention generally provides for the film material that has been plastified during welding, and is consequently free-flowing, to be specifically displaced by increasing the sealing surface area. The displaced film material can for instance compensate for dimensional and form tolerances. At the same time, however, the strength of the welded seam region, which adjoins the interior space of the bag, is not reduced.
1 . A medical bag, comprising:
a plurality of films welded to one another along at least one weld seam, the at least one weld seam having a peripheral inner region, a thinned-out region adjacent the peripheral inner region, and a peripheral outer region adjacent the thinned-out region, and a thickness of the thinned-out region being less than a thickness of the peripheral inner region and a thickness of the peripheral outer region; and
a port welded into the at least one weld seam.
2 . The medical bag of claim 1 , wherein the thickness of the peripheral inner region is substantially equal to a thickness of one of the plurality of films or a total thickness of the plurality of films.
3 . The medical bag of claim 1 , wherein the thickness of the peripheral outer region is substantially equal to a thickness of one of the plurality of films or a total thickness of the plurality of films.
4 . The medical bag of claim 1 , wherein the thinned-out region extends in a strip shape along the at least one weld seam.
5 . The medical bag of claim 1 , wherein the thickness of the thinned-out region is at least 10% less than the thickness of the peripheral inner region and the thickness of the peripheral outer region.
6 . The medical bag of claim 1 , wherein the thickness of the thinned-out region is 15% to 25% less than the thickness of the peripheral inner region and the thickness of the peripheral outer region.
7 . The medical bag of claim 1 , wherein a width of the thinned-out region is 30% to 80% of a width of the at least one weld seam.
8 . The medical bag of claim 1 , wherein a width of the thinned-out region is 60% to 75% of a width of the at least one weld seam.
9 . The medical bag of claim 1 , wherein the at least one weld seam defines an imprint of a rib extending parallel to the at least one weld seam in the region of the port.
10 . The medical bag of claim 9 , wherein the imprint of the rib is 0.5 mm to 1.5 mm wide.
11 . The medical bag of claim 9 , wherein the imprint of the rib is 10 mm to 60 mm deep.
12 . The medical bag of claim 1 , wherein the plurality of films are multilayered polyolefin films.
13 . The medical bag of claim 1 , wherein each of the plurality of films has a thickness of 150 μm to 300 μm.
14 . A pharmaceutical product comprising the medical bag of claim 1 , wherein the medical bag is filled with a medical liquid.
15 . The pharmaceutical product of claim 14 , wherein the medical liquid comprises a saline solution, a glucose solution, a nutrient solution, or an emulsion.
16 . The pharmaceutical product of claim 14 , wherein the medical liquid comprises an active ingredient.
17 . The medical bag of claim 1 , wherein the thickness of the peripheral inner region and the thickness of the peripheral outer region are substantially equal to a thickness of one of the plurality of films in the region of the port.