Too thick, material not suitable for all bag soda

When the original coil Bomann my machine runs out I vainly sought a replacement in the brand, and ended up doing on those. The problem is that the plastic is so thick that it is not suitable at all to my machine. The thread that should cut and weld ends up stuck to the plastic, it must tear the material, it is not practical. Worse, as is too thick and the plastic does not melt sufficiently, the bag is sealed and defeated evil.

These coils are not suitable at all as replacement for the original coil. I do not recommend it at all: /