Sony has developed a new graphene producing process that use a roll-to-roll method. They have built a machine that can produce graphene sheets up to 100 meters in length (23 cm width), and the resulting sheet is the largest area graphene sheet in the world by far (the previous record was Samsung's 40" sheet from back in 2011):

http://www.graphene-info.com/sony-developed-new-r2r-method-make-graphene-produced-100-meter-long-sheet