| 摘要 |
PCT No. PCT/FR87/00170 Sec. 371 Date Mar. 2, 1988 Sec. 102(e) Date Mar. 2, 1988 PCT Filed May 20, 1987 PCT Pub. No. WO87/07205 PCT Pub. Date Dec. 3, 1987.Device for welding a mouthpiece to a thermoplastic film comprising a frame, a support plate carried by the frame and moveable with respect to the latter, a welding head rigidly connected to the support plate, and at least one annular heating resistance carried by the welding head and having electric supply rods arranged at two diametrically opposite points. The device comprises diffusion means for diffusing a cooling gas at the vicinity of the fixation of the supply rods to the heating resistance; preferably, the cooling gas diffusion means comprise channels extending in the welding head and surrounding the supply rods. The invention also relates to the mounting of the welding device on a moveable frame and its association with a film blocking device. |
