| 摘要 |
A pair of sealing bars for a pouch packaging machine have sealing surfaces which are asymmetrical with respect to one another. The sealing surface on one of the sealing bars is flat and smooth, having linear edges in two perpendicular directions. The sealing surface on the other of the sealing bars is shaped as a portion of a curved cylindrical surface, defined by a linear edge in a first direction and an arcuate edge in a perpendicular direction. The bars are positioned with respect to one another such that the curved sealing surface on the one bar convexly projects toward the flat, planar sealing surface on the other bar. Seals formed with these asymmetrical sealing bars have a sealing bead which is thinner in the center and thickens outwardly toward both ends moving away from the center.
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