Patent ID: 6428456
Filing Date: 2002-08-06
Classification: B31B,B65B,B65D

Abstract:
An apparatus for forming containers with reinforced edges, comprising:a roll for feeding a flexible film; a forming collar upstream of a first tube around which the film is wrapped; a device for heat-sealing the longitudinal flaps of the film wrapped around the tube so as to form an enclosure, the first tube tapering into a second tube and at the tapering region at least one insertion element acting at right angles to the surface of the film, so as to form at least one rib which is directed toward the inside of the enclosure, a sealing device for at least partially heat-sealing said at least one rib being also provided, said at least one rib being formed by an odd number of overlapped heat-sealed portions of said film, said odd number being at least three; the difference between the perimeter length of the two tubes being equal to twice the sum of the depth of the ribs to be obtained.