| 摘要 |
A joining apparatus and methods wherein, after plastic film is formed into a variable size tube for receiving therein and enveloping corresponding variable size large articles such as bales of cotton, trash, cloth, etc., the joining apparatus joins an overlap region of the plastic film tube for effectively sealing and creating the plastic film tube. The joining apparatus includes an inner shoe located inside the formed tube. The overlap region slides over the inside shoe as the tube is formed. An outside shoe is moveable between an idle position away from and an operative position adjacent to the inside shoe. When in its operative position, the overlap region is sandwiched between the outside and inside shoes and heated air is provided under pressure through a groove on the outside shoe and onto the overlap region for effectively heating and joining the overlapped plastic sheets. |
