(57) A closing device (1) is configured for a wrapping machine of the type comprising
a turntable or a ring and suitable for closing an open end (2) of a wrapping (3) of
thermoweldable extendible plastic film when said plastic film is wrapped around a
palletised product (4) by said wrapping machine, said open end (2) being provided
in a band (3A) of said wrapping (3) that projects beyond the top (5) of said palletised
product (4), said closing device (1) comprising closing means (7) arranged for bringing
together portions of said band (3A) and retaining means (6) cooperating with said
closing means (7) and arranged for retaining said plastic film of said open end (2)
and for folding said portions, said closing means (7) being provided with a welding
element (8) for welding said portions of said band (3A) above said top (5), so as
to close the opening of said open end (2), in which said closing means (7) comprises
a pair of arms (7A, 7B), supported by a framework (9) provided in said closing device
(1) and drivable in such a manner that at least respective ends (12) of said arms
(7A, 7B) are movable towards and away from one another, said welding element (8) being
fixed to each of said respective ends (12), and in which said retaining means (6)
is connected to said closing means (7) in such a manner as to be driven by the motion
of said closing means (7) between an extended configuration (E), in which said retaining
means (6) maintains said portions extended and a folded configuration (K), in which
retaining means (6) retains said portions substantially superimposed on one another
(H).
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