Patent ID: 8580179

Claim:
An apparatus for moulding a thermoplastic package part in association with an end portion of a packaging container body, the packaging container body including thermoplastic at least in an inner layer, the apparatus comprising: an inner mould element and an outer mould element between which a mould cavity is formed, the cavity being disposed to be able to receive at least said end portion of the packaging container body so that it is in contact with the cavity, and of which at least one of said mould elements is at least partly freely suspended, means for injecting a plastic melt in the cavity, means for converging said mould elements so that the cavity is closed and for applying a compression force on the mould elements for forcing out the plastic melt in the cavity, the compression force, as a result of the partly free suspension of at least one of the mould elements, acting in a force centre, wherein the plastic melt is injected in a first number ≧1 of points in the cavity, an island of plastic melt for each point being formed inside the cavity, and a distribution of said points is such that said force centre may be caused to pass through a surface which is defined by a parallel projection of each one of said first number of islands on a plane which is orthogonal to a direction of the compression force, and, when said first number >1, a second number of imaginary straight lines which interconnect a third number of the parallel projections in such a manner that the surface will be at its maximum.