| 摘要 |
Process for protecting hand-written or printed writing on documents (42-44) made on paper, especially bank documents and the like, by means of superimposition over the parts to be protected of a flexible sheet (45-47) impregnated with an acrylic modified polyurethane polymer, and by generation of pressure so as to determine, by a kind of cold plasticization process, stable association of said sheet (45-47) on the document (42-44) making it impossible to erase in an illegal manner the writing on the document and addition of new counterfeited writing. |
