| 摘要 |
A closure unit for storage and handling containers of flowable goods is composed of at least two thermoplastic materials, and its zones made of different materials take up different functions. A base material (A.2) takes up the sealing function against the container (G.2), additional materials (B.2, C) take up for example a supplementary sealing function, or increase mechanical stability, limit permeability, increase elasticity so that an additional opening and closure may be produced and/or make absorption possible. This closure unit is produced by the multimaterial injection moulding process so that the contact surfaces between the various materials are selectively interconnected by a reversible or irreversible interlock, and/or by more or less intensive melting into each other. The closure unit is made of two pieces, i.e. a pouring part (1.2) and a closure part (2.2) or it is made of a single piece. The two-piece closure unit is produced in its closed state in a single operation. |
