Abstract: A device for the pre-sealing of a document to a plastic band comprises at least one first cylinder on which the document is wound from a first given point of space tangential to the cylinder and a mechanism for heating the plastic band at a second point tangential to the cylinder where the plastic band is in contact with the document, this tangential point forming a constant angle (.alpha.) with the given point of space, the document being pre-sealed by the affixing of the plastic band to this second tangential point. Application to the pre-sealing, to a plastic band, of documents that are to be plastified on an industrial scale.