| 摘要 |
<p>Means for applying a finishing layer of plastic material to the surface of a pipe, comprising a ring (1) of which the inlet diameter (2) is larger than its outlet diameter (3), the internal surface (4) of said ring further providing for a degressive variation of the inner diameter between its inlet and its outlet; method for applying a finishing layer wherein these means are used, and pipe thus coated.</p> |
