Patent EP-2722172-A1 (EP)
Inventor: DIETEMANN PHILIPPE
IPC: B29C55/00
Filed: 2008-12-19
Abstract: The sheet (1) useful in an article including security and/or valuable document, comprises a coextruded support (2) made of a polymer material comprising a core layer (10) with 3-7% of gap (14), skin layers (11, 12) and a traversing opening, a surface partially covering one side of the support, a transparent part comprising a polymer film, and security elements respectively present in skin layer, core layer and in a coating (13). A fine cut imprint is made on the sheet. One of layers of the support comprises a security element in the mass. The core layer is arranged between the skin layers. The sheet (1) useful in an article including security and/or valuable document, comprises a coextruded support (2) made of a polymer material comprising a core layer (10) with 3-7% of gap (14), skin layers (11, 12) and a traversing opening, a surface partially covering one side of the support, a transparent part comprising a polymer film, and security elements respectively present in skin layer, core layer and in a coating (13). A fine cut imprint is made on the sheet. One of layers of the support comprises a security element in the mass. The core layer is arranged between the skin layers. The skin layers have different colors. The core layer has a thickness of 75 mu m. The skin layer has a thickness of 10 mu m. The support has a total thickness of 70-120 mu m. Both sides of the support are covered by a coating with a dye that confers printability to the sheet. The traversing opening is located in a lateral side of the sheet, and has an area of 3 and 5 cm 2>. The transparent part is partially equipped with a printable coating and/or an enhancing ink adhesive, and is an element covering the traversing opening. The traversing opening is covered by two components partially covering one side of the support. The component is present in the form of a patch or a strip extending from one edge to another opposite to the support, and has an over thickness of 5-20 mu m at the right of the traversing opening. The transparent part represents 20-40% of the total surface of one side of the sheet, and extends from both sides of the support in the covering area. The transparent part and/or the support comprises a non traversing recess or an opening in the covering area. An opening overlaps a visible character, when the sheet is folded into two parts. The security element overlaps, when the sheet is folded in two parts to form a confidentiality or to reveal an information. The fine cut imprint comprises fluorescent ink, phosphorescent ink, luminescent ink, photochromic or thermochromic ink, and forms embossments of less than 20 mu m of thickness. The core layer has a higher mass concentration of security components than the skin layers or the coating. The security element includes a security thread, foil, patch, small board, a knitted thread, a particle for marking, a pseudo watermark, a security fiber, luminescent pigments, iridescents, magnetic fibers and/or metallic fibers, and corresponds to an authentification element and/or identification element. The authentification element and/or identification element is a visible and/or detectable element for displaying falsification, an element with liquid crystal having variable visual effect such as interference, diffraction, holography and/or iridescent, a magnetic or crystalline coating, magnetic fibers, tracers detectable by magnetic resonance, X-ray fluorescence, biomarkers, a varnish or an ink, luminescent-, fluorescent- or phosphorescent tracers, photochromic-, thermochromic-, electroluminescent and/or piezochromic compounds, and electronic devices including radio-frequency identification device. The security element is visible under UV light or laser. The skin layer appears by reflection with different colors, and the sheet appears by see-through vision with a color different from the colors of the two skin layers visible by reflection. An independent claim is included for a process for the fabrication of a sheet.