Cover incorporating a radio frequency identification device
The invention relates to a multilayer structure such as a cover paper for a booklet, in particular a passport. The structure includes a radiofrequency identification device ( 31, 32 ) having a chip ( 31 ) which is received in the thickness of the multilayer structure without generating extra thickness, the materials constituting the various layers of the multilayer structure are selected, as are the thicknesses of said layers, in such a manner that the cover ( 20 ) withstands mechanical and thermal shocks, and in particular is capable of being subjected to graining treatment, and/or to decoration treatment by depositing a film by hot transfer under pressure, and/or to lamination treatment while depositing security films.
1. A method of manufacturing a multilayer structure having a thickness and configured for being folded along a fold and comprising a radio-frequency identification device having a chip, the chip being received at least partially in the thickness of the multilayer structure, the method comprising:
depositing the radio-frequency identification device on a first sheet; and
assembling said first sheet on a second sheet in such a manner as to obtain a resultant thickness that is substantially constant, the second sheet being sufficiently compressible at the time of assembly to receive the chip in its thickness.
2. A method according to claim 1 , wherein the first sheet comprises a fiber base, and the chip and the antenna of the radio-frequency identification device are deposited on a face of said first sheet.
3. A method according to claim 1 , wherein the first sheet is coated with a polymer-based mixture that is suitable for graining.
4. A method according to claim 1 , wherein a polymer-based mixture suitable for graining is deposited after the first and second sheets have been assembled together.
5. A method according to claim 1 , wherein the second sheet is impregnated with a thermoplastic polymer.
6. A method according to claim 1 , wherein the chip and the antenna are fixed on a support film prior to being associated with a fiber base.
7. A method according to claim 2 , wherein the fiber base is a paper base.
8. A method according to claim 2 , wherein the fiber base is saturated with a material comprising an elastomer latex for providing resistance to tearing and subsequently for protecting the radio-frequency identification device.
9. A method according to claim 6 , wherein the support film is a polyester film.