| 摘要 |
<p>The present invention relates to an apparatus and a method for moulding one or more thermoplastic package parts in association each to an end portion (20) of a packaging container body (12). The apparatus is of the type which includes an inner mould element (24) and an outer mould element (26) between which a mould cavity (30) per package part is formed. At least one of these mould elements is at least partly freely suspended. In the case when one package part is moulded with the mould elements, the apparatus is characterised in that a plastic melt (32) is injected in a first number <u>></u> 1 of points (42) in the cavity (30), an island (45) of plastic melt for each point being formed inside the cavity, and that the distribution of said points (42) is such that a force centre (F) may be caused to pass through a surface (92) which is defined by a parallel projection (45', 45') of each one of said first number of islands (45) on a plane (P) which is orthogonal to a direction (D) of the compression force and, when said first number > 1, a second number of imaginary straight lines (90) which interconnect a third number of the parallel projections (45', 45') in such a manner that the surface (92) will be at its maximum.</p> |
