LONGITUDINALLY SEALING MECHANISM IN BAG-MAKING AND PACKAGING MACHINE

摘要

PURPOSE: To prevent herring-bone wrinkles from being generated on each side of a longitudinal seal part. CONSTITUTION: Wrinkles are prevented from being generated on each side of a longitudinal seal part by setting the moving speed Vh of a longitudinal seal belt 6 to be 1.05 to 1.30 times the carrying speed Vf of a pull-down belt 3 so that the heat and the large tensile force are given to the seam of the packaging material (s) to weld the layers, while drawing the layer to be welded of the reverse side of the packaging material (s) which will shrink, thereby shrinking does not occur on both sides of the vertically sealed part.