Machine for the production of bags made of heat-sealed alveolar or foamed thermoplastic material
AssigneeOffmar S.R.L.
InventorsEmiliano Matta, Luigi Matta
Life of this patent
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Abstract
A machine for the production of bags made of alveolar or foamed plastic material starting from at least one continuous web with superimposed flaps fed continuously to a heat-sealing assembly. The heat-sealing assembly is actuated according to a pendular motion in synchronism with continuous advance of the web, and is pre-arranged for carrying out, at the same time as heat-sealing, half-cuts on the web, which is then folded in concertina fashion by means of a lapper assembly at output from the machine.
Claims12
A machine for the production of bags made of thermoplastic material starting from at least one continuous web with superimposed flaps fed continuously to a heat-sealing assembly, said heat-sealing assembly including:
- a hot-blade device and a contrast element set transversely on opposite sides with respect to the web,
- actuation means for controlling displacement of the heat-sealing assembly and mutual opening and closing between said hot-blade device and said contrast element in synchronism with advance of the web, and
- wherein said actuation means are pre-arranged for carrying out a pendular motion of said heat-sealing assembly;
- and wherein said heat-sealing assembly includes a generally vertical support oscillating about a transverse axis situated underneath the web and carrying at the top said hot-blade device and said contrast element, and said actuation means including a crank mechanism with a motor-driven shaft with an eccentric cam parallel to said transverse axis and actuating said oscillating support.
Dependencies are inferred from the claim text.