We demonstrate the direct transfer of graphene from Cu foil to glass and flexible substrates such as PET, using polyimide (PI) mixed with an aminosilane (3-aminopropyltrimethoxysilane) or only PI, respectively, as intermediate layer. We probe the scalability and roll-to-roll processing of this technique by using two different equipment: hot press and a laminator. High quality, clean and continuous areas of graphene monolayer can be transferred with the advantage of Cu recycling for future growth catalyst as it is peeled-off mechanically from the substrate/PI/graphene structure. More important are the high transparency of the samples together with the electron doping achieved (n_S= 0.21 to 4 x 10¹³ cm^-2), as the performing graphene face is not in direct contact with PMMA, PI or other materials, and the high mobility (µ_H up to 1250 cm²/Vcenterdots). Stability of the structure in terms of sheet resistance (R_S) at high temperatures, bending cycles and water immersion make this technique promising for future applications and implementation at the large scale.