Method and device for fastening an item to an object surface made of a porous or fibrous material

A method for fastening an identification carrier on an object surface of a porous or fibrous material with the help of a liquefiable thermoplastic and a fastening tool, comprising the steps of:

• providing a fastening film that includes a liquefiable thermoplastic,
• providing an identification carrier to be fastened that is separate from the fastening film or is integrated into the fastening film,
• providing a fastening tool that has a distal profile that runs linearly in a manner adapted to the identification carrier or to the fastening film, and is designed for feeding energy suitable for the local liquefaction of the thermoplastic, to said distal profile,
• positioning the fastening film and, as the case may be, the separate identification carrier on the object surface, wherein the object surface is a hard object surface, and wherein the distal profile of the fastening tool is positioned on the fastening film,
• pressing the distal profile against the object surface, and simultaneously subjecting the distal profile to the energy, until a sufficient quantity of the thermoplastic is liquefied by the distal profile and has penetrated into the material of the object surface, in order to anchor the fastening film in this surface;
• wherein the energy is mechanical vibration energy, and
• wherein the distal profile extends linearly at least partly around a central region and the distal profile and the central region are designed in a manner such that only the distal profile is in contact with the fastening film during the application of pressure and mechanical vibration energy on the fastening film, and wherein the distal profile of the fastening tool comprises an outer cutting portion and an inner non-cutting pressing surface portion, and wherein the cutting portion comprises a row of cutting teeth.