Abstract: In an apparatus useful for sealing layers of a web comprised of plastic film layers to one another in a bag-making machine, a sealing drum having a cylindrical surface is employed. A sealing blanket is deployed about plural blanket rolls and about the sealing drum so that a substantial portion of the cylindrical surface of the sealing drum is wrapped by the sealing blanket with the wrapping surface facing the cylindrical surface while the remaining portion of the cylindrical surface is not wrapped thereby at any given time. A nip roll acts together with one of the blanket rolls so as to define a nip. An idle roll is located near the nip.

Abstract: In a winder for winding webs from a bag-making machine into rolls, a winding turret mounts four winding spindles, each having a web-winding portion and a pulley-mounting portion, which mounts a conjointly rotatable pulley and an independently rotatable pulley. A first timing belt and a second timing belt are arranged to be independently driven. The winding turret is indexable so that, in any indexed position, a first timing belt interengages the conjointly rotatable pulley mounted on the given winding spindle and interengages the independently rotatable pulley mounted on the next winding spindle and a second timing belt interengages the independently rotatable pulley mounted on the given winding spindle and interengages the conjointly rotatable pulley mounted on the next winding spindle. The rotational speeds of a motor driving a given winding spindle, whichever is being used to complete winding of a roll, and the rotational speed of a motor driving a web conveyor are measured.

Abstract: There is provided a blanket sealing bag machine having a variable diameter sealing drum comprising a plurality of spindles disposed at a first end of an axle and a like plurality of spindles disposed at an opposing end of the axle, the plurality of spindles being greater than sixteen spindles, the spindles extending radially from the axle. There is further provided a blanket sealing bag machine that maximizes the angle of blanket wrap.