Retroreflective sheeting and method and apparatus for producing same

Retroreflective sheeting comprising a body portion having smooth, substantially parallel opposite surfaces, and a multiplicity of minute cube corner formations closely spaced thereon and projecting from one of said surfaces thereof, each of said cube corner formations having three faces and a base adjacent said body portion with a side edge dimension of not more than about 0.025 inch and being a composite of a first resin for formulation providing the body of the cube corner formation and a second resin formulation substantially providing said base, said body portion being formed separately from said cube corner formations and said cube corner formations being bonded to said body portion by said second resin formulation with said close spacing substantially avoiding any smooth areas therebetween, said body portion and cube corner formations being fabricated from [at least one] transparent synthetic resin and said first and second resin formulations of said cube corner formation being of different composition and of substantially the same refractive index to provide retroreflective sheeting in which those light rays entering through the other of said surfaces of said body portion predominately pass through said body portion and into said cube corner formations and are reflected thereby back through said body portion along paths that are substantially parallel to their paths of entry.