| 摘要 |
PURPOSE:To obtain a rollstock of film sacks for packaging by performing multi-face printing so that images in a plurality of types appear on a inflation film tube at intervals corresponding to the sack height, and providing transverse seal and perforation. CONSTITUTION:Resin which has fused with rotation of a screw 4, is extruded upward from a ring die 5 and pulled by a nip roll 6. Air is blown in from an air supply pipe 7, and each inflation film tube 1 thus formed undergoes printing of images by a printing roll 8, whereon images A, B... in different figures are allocated at intervals according to the sack height, together with printing of a regi. mark M in the seal cut position. A sensor 12 senses the mark M, and a seal cutter 10 situated downstream provides seal and perforation, and thus rollstock is made by a winder 10. Thus a rollstock of plastic film sacks for packaging is obtained, whereon images in different figures appear repeatedly.
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