Patent ID: 7958924

Claim:
An apparatus for producing one or more weld seams on a foil bag, comprising: an ultrasonic source; and a press including an anvil having a weld side facing the ultrasonic source with a projection having a height and a width, the projection having at least one depression with a depth and a width, the press being constructed and arranged so that a portion of the foil bag is clamped between the projection and the ultrasonic source to provide a pressure on at least a part of one or more foil sheets of the foil bag proximate the ultrasonic source to create the one or more weld seams on the foil bag, wherein the depth of the at least one depression is less than height of the projection and the width of the at least one depression is approximately 20%-50% the width of the projection and the at least one depression is substantially filled by a melted material when the one or more weld seam is created; and wherein the anvil is constructed and arranged such that it is capable of moving toward the ultrasonic source to clamp the foil bag such that the one or more weld seam is produced with a single movement of the anvil.