Method for making a layered structure embedding three-dimensional elements made of crystal glass or precious stones

A method for making a layered structure comprising a first support layer, a second support layer, and an adhesive intermediate layer interposed between the first layer and the second layer which is adapted to fix the first and second layer to each other, the intermediate layer operatively embedding at least one three-dimensional macroscopic element made of crystal glass or precious stones, and the intermediate layer being made of a thermoplastic resin having a melting temperature (Tm), the method comprising the steps of:

• a1) applying the at least one three-dimensional macroscopic element on a surface of the first layer,
• a2) laying the intermediate layer on the first layer and the at least one three-dimensional macroscopic element,
• a3) applying the second layer on the intermediate layer thus forming an arranged layered structure,
• b1) applying a vacuum to the layered structure between −0.700 and −0.999 bar at a first temperature of between 10° C. and (Tm minus 30° C.),
• b2) increasing the temperature with a heating rate of between 1 and 10° C./min to a second temperature of between (Tm minus 30° C.) and Tm in order to soften the intermediate layer, while also maintaining the vacuum of step b1),
• b3) maintaining the second temperature for at least 20 minutes to stabilize the intermediate layer while also maintaining the vacuum of step b1),
• b4) increasing the temperature with a heating rate of between 1 and 10° C./min reaching a third temperature of between Tm and Tm+60° C. in order to melt the intermediate layer, while also maintaining the vacuum of step b1),
• b5) maintaining the third temperature for at least 80 minutes to stabilize the intermediate layer while also maintaining the vacuum of step b1).