| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a forgery preventive sheet which can be stably manufactured without surface printing dirt of threads caused by printing in the preventive sheet obtained by partly exposing the threads between paper layers and paper making. SOLUTION: In a forgery preventive sheet comprising threads having thermoplastic adhesive layers provided on both side surfaces of a yarn-like or tape-like base material are papermade in a paper layer and partly exposed with a surface of the sheet, the surface adhesive layer of the side exposed at the threads is an organic solvent soluble type adhesive having a glass transition temperature of 20 deg.C or higher. A main component of the adhesive layer is at least one type of an ethylene-vinyl acetate resin, polyester resin, vinyl chloride vinyl acetate resin, olefin resin, acrylic resin and acryl-styrene resin. And, the forgery preventive sheet is obtained by papermaking the threads for forgery prevention to be partly exposed at least between the sheet layers.</p> |
