Apparatus and method for injection moulding a cap with a tamperproof ring
AssigneeSacmi Cooperativa Meccanici Imola Societa' Cooperativa
InventorDanilo ALBONETTI
Life of this patent
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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.
Claims16
1-15. (canceled)
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 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 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;
A molding apparatus, comprising
- (a) a mold first portion adapted for insertion into a capsule body;
- (b) at least two mold half-portions which are arranged around said mold first portion and operable an open position in which the capsule body is insertable between said mold half-portions and said mold first portion and a closed position in which said mold half-portions and said mold first portion define a molding cavity for overmolding a safety ring on the capsule body;
- (c) at least one of said at least two mold half-portions containing an inlet channel which extends to said molding cavity;
- and
- (d) at least one pushing element which is displaceable within said inlet channel to push synthetic plastic material into said molding cavity to form the safety ring.
A container closure cap, comprising
- (a) a capsule body made of metallic material and including at least one closing wall to close a container and an annular wall for connection with a neck of the container;
- (b) a safety ring made of synthetic plastic material and including at least one connecting portion connected with said annular wall and at least one detachable portion connected with said connecting portion by a frangible portion which breaks at the opening of the capsule body;
- (c) a non-frangible portion for connecting said detachable portion with said connecting portion, said non-frangible portion comprising at least one rib extending longitudinally in the direction of an axis of the capsule body, said detachable portion remaining connected with the capsule by said non-frangible portion at opening of the container rather than remaining on the container;
- and
- (d) said detachable portion containing at least one frangible line extending longitudinally parallel to said capsule body axis from a bottom end edge of said detachable portion for at least half of an axial length of said detachable portion.
Dependencies are inferred from the claim text.