| 摘要 |
<P>PROBLEM TO BE SOLVED: To simultaneously weld the edge of an opening of a packing body in a belt-type vacuum packing machine from both of the upper and and lower sides. <P>SOLUTION: A cover material 20 is stuck on a belt conveyor 13 and seals the packing body 10, and an electric conductor 43 fixed on the cover material 20 also comes into contact with an electric receiver 60 fixed on the belt conveyor 13. Consequently, a second wire line 45 is connected with a second filament 40 arranged on an upper surface of a seal stand 14 via a connecting line 47, and a first filament 30 arranged on a lower surface of a sealing bar 29 located above the sealing stand 29 is connected with a first wire line 36. Then, the edge of the opening of the packing body 10 can be simultaneously heated at both faces with impulse electric currents to the first and second filaments 30 and 40 interposing and pushing the edge of the opening from both sides. <P>COPYRIGHT: (C)2008,JPO&INPIT |
