We produce heat sealable coatings that we apply onto PET films, in this case onto your 36PET-CP-BOPET film, by reverse gravure. We encounter issues with the slack bands during the running of your 36PET-CP-BOPET film on our coating line. In this line, your film is fed by an unwind and then it travels in the machine through a series of cylinders to get to the coating station (reverse gravure) and then it continues its way through the line to get to the coating drying area and it is finally rewound in a rewind station. The total thread of the machine can be 60-80m long from the unwind to the rewind. With such a long thread, it is key that the film fed into the line is perfectly formed and aligned. The issue with a slack band in the 36PET-CP-BOPET reel means that the rewind pulls with a higher tension from one side than from the other side and this translates into creasing being formed when the film passes through the nips.