| 摘要 |
A pre-stretching unit is disclosed for a pallet-wrapping apparatus, of the type comprising a series of driven rollers (11, 12) apt to stretch a film (P) of a stretchable material before the application thereof to a load (C) to be packaged, at least one of said driven rollers (11, 12) being connected to a power input, and wherein between said power input and said at least one driven roller a dosable energy transfer mechanism is provided, apt to transfer a constant energy which is equal or slightly below that necessary to drive into rotation the pre-stretching unit in the absence of tension on the stretch film (P).
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