English to Italian Tech/Engineering Engineering (general)

Come tradurreste "back to back"?

" Firstly, apply acetic acid resin on the white cardboard with the same specifications for the album by means of the sizing machine, bond it with the photo properly, sufficiently dry the board after the photos are bonded, and then crease the boards in the middle one by one by the creasing machine, fold the board manually, apply the adhesive on the back of the board, align it by referring to the middle seam and bond them well back to back, press and dry it as a whole for 1 day; after being flattened, trim the three edges (except the middle seam) to complete the making of the album core, afterwards, add ornaments such as an ironed edge, stick the cover to finish making an album."


Grazie !