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Method of imprinting holograms, motion holograms, diffraction patterns, or microengravings that produce other optical effects directly on paper
Method of imprinting holograms, motion holograms, diffraction patterns, or microengravings that produce other optical effects directly on paper
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机译:直接在纸上压印全息图,运动全息图,衍射图样或微刻版的方法,以产生其他光学效果
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PCT No. PCT/IT95/00222 Sec. 371 Date Jun. 16, 1997 Sec. 102(e) Date Jun. 16, 1997 PCT Filed Dec. 19, 1995 PCT Pub. No. WO96/19357 PCT Pub. Date Jun. 27, 1996A method for impression microengravings, which reproduce holograms, kinetic holograms, or diffraction patterns, directly on paper through an embossing process. Paper is subjected to a humidification step to give it a degree of humidity between 60 and 80% of relative humidity. The humidified paper is then passed through an embossing group, consisting of an embossing cylinder carrying the microengravings and a counterthrust cylinder, at a temperature and a pressure on the paper within the ranges of 90-220 DEG C. and 20-120 kg/mm2, respectively.
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