A print medium includes a planar film. A rib-like structure is arranged on one side of the film to define a series of columns that extend a length of the film to facilitate rolling of the print medium in one direction as opposed to an opposite direction....http://www.google.es/patents/US7291447?utm_source=gb-gplus-sharePatente US7291447 - Print medium with one side defined by a rib-like structure
Print medium with one side defined by a rib-like structure
