| 摘要 |
<p>The method includes the step of providing a continuous sheet of thermoplastic material with a Z-fold extending longitudinally along it before the sheet is wrapped around a filling tube for forming and filling the packages. The Z-fold is maintained on the tube of thermoplastic material thus formed until it reaches a loop opener on the outside surface of the filling tube. The loop opener transforms the Z-fold into a loop extending longitudinally along and outwardly from the filling tube and from the tube of thermoplastic material wrapped around it. Simultaneously, a continuous plastics sliding clasp fastener having a pair of mutually interlocking profiles is directed into the tube of thermoplastic material along a channel on the outside surface of the filling tube. The sliding clasp fastener is ultimately guided out from the channel, through the loop opener and into the loop, and is sealed to it to form the reclosable openings for the plastics packages being manufactured.</p> |
