Patent ID: 7198377

Claim:
A method of producing a retro-reflective heat transfer film with a transparent protective sheet for the whole surface, comprises the steps of: A. heat-joining a PET release film ( 2 ) and a transparent TPU sheet ( 1 ); B. forming a sticky-adhesive layer or a hot melt adhesive layer ( 3 ) on the surface of the transparent TPU sheet ( 1 ) subject to step A; C. fixing glass beads ( 4 ) made of beads with a refractive index of 2.2 to the semi-finished sheet subject to step B; D. coating a thin film of transparent resin on the surface of the glass beads ( 4 ) of the semi-finished sheet subject to step C, and then forming an aluminum vacuum-coating layer ( 5 ) on the coated thin film; E. forming a reflective resin layer ( 6 ) transparent, colored or with graphics on the surface of the aluminum vacuum-coating layer ( 5 ) of the semi-finished sheet subject to step D; and F. producing a transfer sheet by forming a transparent hot melt resin layer ( 7 ) on the surface of the reflective resin layer ( 6 ) of the semi-finished sheet subject to the above fifth step.