Patent ID: 6860958

Claim:
A vertical form/fill/seal apparatus comprising: a) a forming tube; b) a longitudinal heat sealing device; c) a pair of film drive belts; d) transverse heat seal bars; e) a first pair of cylindrical rollers comprising i) a first roller and ii) a second roller, the first and second roller each in parallel juxtaposed relation to each other, and each having a substantially smooth surface; and f) a second pair of cylindrical rollers comprising i) a third roller and ii) a fourth roller, the third and fourth roller each in parallel juxtaposed relation to each other, and at least one of the third and fourth roller having a chevron pattern disposed on the surface thereof; wherein the first pair of cylindrical rollers is adjacent to and spaced apart from the second pair of cylindrical rollers; and wherein the third and fourth rollers are adapted to accommodate a lay flat tubular film passing between and in contact with the rollers, such that wrinkles present in the film are reduced.