| 摘要 |
<p>The process comprises provision of an oblique annular channel leading from the input to the bottom and the periphery of this. The channel consists of alternating constrictions and zones equal in cross-section to the periphery of the prod. The interior of the mould is a former projecting above the hollow mould, and flattened zones are provided in the bottom of the external mould surrounding part.</p> |
