PROCESS TO APPLY DIGITAL IMAGES IN STRAPS, comprising the following steps: - providing straps wound in reels, manufactured with the ordinary weave or with an special weave made of synthetic material, able to receive a bleaching treatment with an optical white, - providing a cutting equipment, at which a paper reel containing the digital images to be transferred to the straps is placed to cut and form paper reels (12, 12'), characterized in that, the process comprises moreover - straps printing stage, which can be applied on both sides/faces of the straps during one singe operation, in which said paper reels (12 and 12') are placed at the printing machine along with the reel of synthetic material straps, wherein said printing machine comprises: an alignment device at the inlet side of the printing machine, which has an specific shape to enable the passage of the papers (12 and 12') and the straps, aligning the same and leading them to the inside of the printing machine, where two calander cylinders one for each side of the straps are provided in a way for presenting drawings perfectly symmetrical on both sides/faces and, for that, between the cylinders it is provided an element to keep the temperature steady that keeps the straps temperature along its passage from one cylinder to the other maximizing the printing procedure and preventing the straps from shrinking, and the papers (12 and 12') are once again wound into reels (19 and 19') at the back side of said machine, which shall be discarded and - straps cutting step wherein the straps, already printed on both sides/faces is duly wound into another reel which is duly cut in the desired length by an ultrasound cutting machine, forming small reels. - providing straps wound in reels, manufactured with the ordinary weave or with an special weave made of synthetic material, able to receive a bleaching treatment with an optical white, - providing a cutting equipment, at which a paper reel containing the digital images to be transferred to the straps is placed to cut and form paper reels (12, 12'), - straps printing stage, which can be applied on both sides/faces of the straps during one singe operation, in which said paper reels (12 and 12') are placed at the printing machine along with the reel of synthetic material straps, wherein said printing machine comprises: an alignment device at the inlet side of the printing machine, which has an specific shape to enable the passage of the papers (12 and 12') and the straps, aligning the same and leading them to the inside of the printing machine, where two calander cylinders one for each side of the straps are provided in a way for presenting drawings perfectly symmetrical on both sides/faces and, for that, between the cylinders it is provided an element to keep the temperature steady that keeps the straps temperature along its passage from one cylinder to the other maximizing the printing procedure and preventing the straps from shrinking, and the papers (12 and 12') are once again wound into reels (19 and 19') at the back side of said machine, which shall be discarded and - straps cutting step wherein the straps, already printed on both sides/faces is duly wound into another reel which is duly cut in the desired length by an ultrasound cutting machine, forming small reels.