| 摘要 |
PURPOSE:To fix glass balls uniformly at low density and to obtain products of good resilience by disposing binder resins like spots on a surface film by a gravure printing method, and fixing glass balls on the respective points of these binder resin dot groups. CONSTITUTION:A resin of good weather resistance such as an acrylic resin or an alkyd resin is formed as a surface film 1 on a base film. Binder resin dot groups 8 of dot-like designs corresponding to required packing density are printed on the surface of said film by a gravure printing method. After the binder resin dot groups are air dried to allow solvent to evaporate to the state having the adhesive force necessary for adhering of glass balls, glass balls 3 are sprayed from above said surface. Thereafter, the film is heated and air dried to allow the resin to cure thoroughly. A focusing resin layer 4 of a polyvinyl acetal resin or polyurethane resin is coated thereon and further an aluminum layer is vacuum deposited as a reflection layer, whereby the retroreflective construction is perfected. |
