Patent ID: 7887745

Claim:
A method of manufacturing a retro-reflective shell having a curved or irregular surface for reflecting light in all directions, the method comprising the steps of: providing a substantially flat sheet of a plastic material; applying a reflective layer on at least one side of said flat sheet plastic material by depositing a transparent adhesive substance and at least one of glass pearls and plastic pearls having a diameter between 0.01 and 0.05 mm onto said flat sheet plastic material forming a laminated product; hardening the laminated product by at least one of heat and radiation; heating said hardened laminated product to a thermo-vacuum-forming temperature; contacting the plastic material of the heated laminated product to a mould having at least one of a curved shape and an irregular surface shape; forming the retro-reflective shell by thermo-vacuum-forming said laminated product on the mould.