| 摘要 |
<p>Thermoplastics foils welding appts. having a pair of relatively movable gripper jaws provided on opposite faces with rubber covers, has one of the jaws provided with a recess in which is located the thermowelding reciprocable welding bar and the recess is connectible by an opening to compressed air to exert planar pressure on the foil portions to be welded. Used in packaging machines. Cooling of the warm seals during retraction of the welding bar is dispensed with.</p> |
