Apparatus and method for injection moulding a cap with a tamperproof ring

Patent metadata

Field	Value
Publication number	US-10974872-B2
Application number	US-201716084486-A
Country	US
Kind code	B2
Filing date	Feb 14, 2017
Priority date	Mar 14, 2016
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

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.

First claim

The invention claimed is:

1. 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.

2. The method according to claim 1 , wherein at least one of the first surface and the second surface of the capsule body is a component of the at least one annular wall.

3. The method according to claim 1 , and further comprising a step of weakening the safety ring by at least one of a cutting apparatus and a folding apparatus which folds a fin portion of the safety ring inwardly to form a fracture zone.

4. The method according to claim 3 , and further comprising a step of forming a seal on the capsule body after one of the overmolding step and the weakening step.

5. The method according to claim 1 , and further comprising a step of removing the capsule body with the safety ring from the mold first portion with an extractor that slides within the first mold portion to engage the capsule body.

Assignees

• Sacmi

Inventors

• Albonetti Danilo

Classifications

• B29L2031/56

  Stoppers or lids for bottles, jars, or the like {, e.g. closures} · CPC title

• B29C33/123

  for centering the inserts · CPC title

• B65D41/00

  Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper (clamping or other pressure-applying devices for securing or retaining closure members B65D45/00) · CPC title

• B29C33/12

  with incorporated means for positioning inserts, e.g. labels {(positioning reinforcements B29C70/541)} · CPC title

• B29L2031/7174

  Capsules · CPC title