Sleeve-shaped foil for transparency frames

摘要

The foil (1) consists of a lower (2) and top sheet (3), welded etc. together so that sleeves (4) are formed in a direction transverse to the foil longitudinal direction (6). Pref. each sleeve is dimensioned to receive two transparency frames. The foil typically contains markings (10,10') in its longitudinal direction. The spacing of the markings corresponds to that of the sleeves in the longitudinal direction of the foil.