| 摘要 |
An enclosing structure (s), in particular for enclosing and isolating outer environment of a packaging machine includes a plurality of enclosing panels (2), suitably and air-tightly assembled. At least one of the panels (2) defines a separating surface (1) for separating two different environments (A, B). Conveying means for conveying flows of purified air (F, F1, F2, F3, F4) are associated to the panel (2) to define, together therewith, a fluid-dynamic barrier, which avoids relative contamination between one environment (A) and the other environment (B).
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