| 摘要 |
<p>The vent consists of a body (1), which is made of tough and flexible steel with circular aperture oriented along an axis of pressing, in which is offset a replaceable compression mould (3) from tempered and abrasion-resistant steel. The compression mould (3) having along an axis of pressing made the more pressing openings (4), which having at inlet a leading conic opening (8). At inlet of pressing openings (4) are formed acute edges (9) and a spike (5) from conjunction of leading conic openings (8).</p> |
