| 摘要 |
A packaging machine comprises feed means (13) and tube forming means (14) for a heat-welding plastic film strip. First welding means (15) weld between them the side edges of the strip while a feed line (11) inputs into the tube thus formed products (12) to be packaged. Second weld means (16) weld transversely the tube at intervals to isolate each product in a section of said tube, thus realizing the package. Characteristically the first (15) and second (16) welding means are pressed against the strip parts to be welded by actuator means (33, 34, 36, 37, 44, 43) controlled by a control device (46) to exert a pressure which is a function of the speed of travel of the strip. <IMAGE> |
