Apparatus and method for injection moulding a cap with a tamperproof ring
AssigneeSacmi Cooperativa Meccanici Imola Societa' Cooperativa
InventorDanilo Albonetti
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Abstract
A method and an apparatus form aluminium screw capsules with a safety ring made of synthetic plastics for tamperproof closing of containers. An aluminium capsule body is inserted into a moulding cavity of a mould conformed and arranged for the overmoulding of a safety ring on an edge of an annular wall of the capsule body. An annular sealing zone is defined for the synthetic plastic material between a first surface of the capsule body and a mould first portion inserted into the central cavity of the capsule body to form a safety ring anchored to the capsule body.
Claims5
A molding method, comprising the steps of (a) providing a capsule body including at least one metallic annular wall;
- (b) arranging said capsule body in a mold;
- (c) defining a molding cavity in said mold adapted to over-mold a safety ring on the at least one metallic annular wall comprising the steps of;
- (1) defining a first annular sealing zone between a first surface of the capsule body and a mold first portion inserted into the capsule body;
- (2) defining a second annular sealing zone between a second surface of the capsule body opposite the first surface of the capsule body and at least two mold half-portions operable between open and closed positions to permit the capsule body to be arranged in the mold;
- and (3) defining a third annular sealing zone between the mold first portion and the at least two mold half-portions;
- and (d) over-molding the safety ring on the annular wall of the capsule body by introducing a synthetic plastic material into the first, second and third sealing zones of the molding cavity.
Dependencies are inferred from the claim text.