Document paper with internal tactile recognition elements includes expansion agents activated by pressing and heating to form curved surface relief on the paper sheet

摘要

The document paper with internal tactile recognition elements has expansion agents incorporated in the paper sheet centrally and near its top and bottom surfaces, forming e.g. a figure. On pressing or heating the expansion agents during and after fabrication of the product, the sheet of paper becomes expanded with fomation of curved relief on the surface of the document.