The card comprises a first translucent or transparent substrate layer, preferably in PVC, and a second substrate layer, and a cracked layer of ink between the two substrate layers so as to allow the second substrate layer to show through the cracks of the layer of ink. The cracked layer of printing ink comprises mirror-effect ink, that reflects light through the first translucent or transparent substrate layer. The cracking of the layer of ink is achieved when the card is manufactured by laminating it.

The card comprises a first translucent or transparent substrate layer, preferably in PVC, and a second substrate layer, and a cracked layer of ink between the two substrate layers so as to allow the second substrate layer to show through the cracks of the layer of ink. The cracked layer of printing ink comprises mirror-effect ink, that reflects light through the first translucent or transparent substrate layer. The cracking of the layer of ink is achieved when the card is manufactured by laminating it.

A method for producing a multilayer body, with the steps of: a) providing a substrate film with a replication layer; b) molding a surface relief appearing to the observer in the form of a three-dimensional free-form surface, which is formed in particular by structures with a lens-like design generating a magnifying, demagnifying or distorting effect, into a surface of the replication layer; c) applying a first metal layer to the surface of the replication layer forming the surface relief; d) wet-chemically applying an at least partially transparent spacer layer to the metal layer; e) applying a second metal layer to the spacer layer.

A method for producing a multilayer body, with the steps of: a) providing a substrate film with a replication layer; b) molding a surface relief appearing to the observer in the form of a three-dimensional free-form surface, which is formed in particular by structures with a lens-like design generating a magnifying, demagnifying or distorting effect, into a surface of the replication layer; c) applying a first metal layer to the surface of the replication layer forming the surface relief; d) wet-chemically applying an at least partially transparent spacer layer to the metal layer; e) applying a second metal layer to the spacer layer.

A retarder film provides a first light retardation and can be heat processed in one or more selected areas to provide a second light retardation in the selected area(s). The retarder film may have an absorption characteristic such that the heat processing can be carried out by selectively exposing the film to a suitable radiant beam. The retarder film is composed of a stack of contiguous ultrathin layers configured to provide an effective optical medium for visible light. Visible light propagates through the stack as an effective medium having effective refractive indices along principal x-, y-, and z-axes. At least some of the ultrathin layers possess intrinsic birefringence, and the effective indices of the stack are functions of the intrinsic refractive indices of the constituent ultrathin layers. The heat processing is carried out so that the ultrathin layer stack structural integrity is not substantially altered in the processed area(s).

In one embodiment, a secure substrate provides a print-ready surface for printing scratch-off products and eliminates the need to print lower security layers for protecting against attempts to view hidden indicia information. In one embodiment, a secure substrate comprises applying microperforations to a dyed substrate that meets a predefined transmission optical density to resist an attempt to reduce the opacity of the dyed substrate by delamination. In another embodiment, a secure substrate comprises applying a lower opacity layer and a lower background layer on a substrate to provide a secure substrate that meets a predefined transmission optical density. In another embodiment, a secure substrate comprises applying a lower opacity layer on a substrate, applying a reflective coating, and applying a lower background layer over the reflective coating to provide a secure substrate that meets a predefined transmission optical density.

The invention relates to a multilayer structure (2) intended to be inserted in an identification document and comprising: at least one first layer (4) at least partially opaque forming a data area (6), the first layer (4) comprising at least one through opening (8) integrally confined by at least partially opaque material of the first layer (4), and a second layer (10) at least partially transparent extending at least partially on the data area (6) in order to extend into the through opening (8), the second layer (10) comprising a part extending beyond the first layer (4) and forming an edge part (12), the second layer (10) comprising at least one element forming a security element, the security element being present and/or visible on and/or in the edge part (12) and in the through opening (8) of the first layer (4).

The invention relates to a multilayer structure (2) intended to be inserted in an identification document and comprising: at least one first layer (4) at least partially opaque forming a data area (6), the first layer (4) comprising at least one through opening (8) integrally confined by at least partially opaque material of the first layer (4), and a second layer (10) at least partially transparent extending at least partially on the data area (6) in order to extend into the through opening (8), the second layer (10) comprising a part extending beyond the first layer (4) and forming an edge part (12), the second layer (10) comprising at least one element forming a security element, the security element being present and/or visible on and/or in the edge part (12) and in the through opening (8) of the first layer (4).

In the field of protection of value documents and value commercial goods, the present disclosure relates to the field of security threads or stripes to be incorporated into or onto security documents, and security documents having security threads or stripes. The security threads or stripes include i) first optically variable layer imparting a first different color impression at different viewing angles, ii) second optically variable layer imparting a second different color impression at different viewing angles, iii) first color constant layer having a color matching color impression of the first or second optically variable layer at a first viewing angle, iv) second color constant layer having a color matching color impression of the first or second optically variable layer at a second viewing angle, and v) a substrate. The layers are jointly visible from one side of the security thread or stripe.

In the field of protection of value documents and value commercial goods, the present disclosure relates to the field of security threads or stripes to be incorporated into or onto security documents, and security documents having security threads or stripes. The security threads or stripes include i) first optically variable layer imparting a first different color impression at different viewing angles, ii) second optically variable layer imparting a second different color impression at different viewing angles, iii) first color constant layer having a color matching color impression of the first or second optically variable layer at a first viewing angle, iv) second color constant layer having a color matching color impression of the first or second optically variable layer at a second viewing angle, and v) a substrate. The layers are jointly visible from one side of the security thread or stripe.