| 摘要 |
A method of and apparatus for heat sealing together two lengths of a thermoplastics strap looped and tensioned around a package and having relatively thick translucent and relatively thin opaque composite layers, wherein the two strap lengths 10, 12 are pressed against the window 14 of a tungsten-halogen lamp assembly 16 with the opaque layer of the lamp-side strap length 10 in pressure contact with the other strap length 12, and the contacting strap lengths are irradiated through the window with a high intensity transmission concentrated by reflectors so that the opaque layer of the lamp-side length melts and fuses to the other strap length to form a heat sealed joint therewith on cooling after the lamp has been switched off. <IMAGE> |
