| 摘要 |
<p>The several embodiments illustrated in the Figures in which welding apparatus employs a conductive ribbon (40) that is heated above the melting temperature of plies of laminar plastic materials (90, 91) held in and by clamp jaws (64, 66). These jaws (64, 66) are cooler than the melting degree of said plies (90, 91) which are gripped by said jaws (64, 66) to locally weld said plies (90, 91) by melting their protruding edges to a determined degree and for a determined period of time by electrical energy passed through said ribbon (40). After welding is completed and the weld is cooled by the jaws (64, 66) are moved apart to release the now welded plies (90, 91). The jaws (64, 66) at their edges facing the heated ribbon (40) are substantially right angled and are disposedfrom these adges 1.2 to 1.98 mm.</p> |
