| 摘要 |
Sealing and printing apparatus, e.g. incorporated into a machine for forming covers for photographic film negatives, wherein length of double layer thermoplastic sheet, suitably flattened thin wall tubing, is arranged to pass between a base drum 40 and a sealing drum 50 provided on its outer periphery with a plurality of heaters for thermal sealing of the two layers of thermoplastic to each other as they pass between and in pressure contact with the base drum and the sealing drum, the base drum also co- operating with a printing drum 71 to print on the web. Each heater comprises an electric heating means and sealing member. A doctor knife 76 is in sliding contact with the printing face of the printing drum. A printing ink holding tray 90 supplies ink to the printing drum. A drive means rotates the aforesaid base drum, sealing drum and printing drum. <IMAGE> |
