| 摘要 |
<p>The invention concerns a moulding set comprising an external mould (10) and an associated internal mould (20), the latter being arranged for fitting into the external mould. The external mould has a main convex portion (11) with a central opening (12), and an end rim (16') extending in a plane, and the internal mould (20) has a main convex portion (21) with a central chimney (23) shaped for passing with little clearance in the opening (12), and an end rim (26) which, when the moulds are mutually fitted, is coplanar to the end rim (16') of the external mould and co-operates with it for closing the moulding space (30) delimited between the convex portions (11, 21).</p> |
