A new generation of picture discs appeared in the 1970s. The first serious pictures discs, with acceptable but still inferior sound quality, were developed by Metronome Records GmbH, a subsidiary of Elektra Records. These new picture discs were made by creating a five-layer lamination consisting of a core of black vinyl with kiln-dried paper decals on either side and then outer skins of clear vinyl film, manufactured by 3M, on the outsides. In manufacture, one layer of the clear film was first placed on the bed of the press on top of the stamper, then a "puck" of hot black vinyl from the extruder was placed on top of that. Finally the top print and vinyl film layer was added (held by a retracting pin in the upper profile usually employed to retain the upper paper label) and the press closed. Problems with poor vinyl flow caused by the paper texture and air released from the paper (that had not been removed in the kiln drying process) plagued the process.