| 摘要 |
<p>A spindle (10) suitable for winding up coreless rolls (11) of a stretchable plastic film; the spindle (10) comprises a tubular body having a peripheral wall (12) defining at least one internal chamber (14) connectable to a pressurised air source. A plurality of perforations (17) extends from the internal chamber (14) of the spindle (10), through the peripheral wall (12) and a protective layer (19) of hard chromehaving a sandblastedouter surface (18) with an average roughness ranging between 6 and 6.5 µm, obtained by dry sandblasting.</p> |
