| 摘要 |
An apparatus (30) for attaching discrete lengths of zipper (44) at spaced intervals across a web (52) of bag making film has an endless belt (36) supported between a pair of pulleys (38,40) for moving zipper segments (44) into position on the web (52). The zipper segments (44) are cut (72) from a zipper supply (68) and fed into a nip (46) between the endless belt (36) and the web top surface. After a zipper segment (44) is deposited into position on the web (52), the endless belt (36) is raised. A vertically movable sealing bar (50) below the web (52) is raised into position to heat the web (52) to seal the zipper (44) to the web (52) after which the sealing bar (50) is lowered. The web (52) then advances and the process is repeated. <IMAGE> |
