A metal safety cap for a jar, bottle or tin

EP4758075A1Pending Publication Date: 2026-06-17SUSTAINABLE PACKAGING DESIGNS LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
SUSTAINABLE PACKAGING DESIGNS LTD
Filing Date
2024-09-13
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Existing child-resistant caps for containers are typically made from synthetic plastics, which are not easily recyclable, take long to degrade, and require complex moulding techniques, making them unsustainable and costly to produce.

Method used

A two-part metal safety cap system comprising an outer and inner cap formed from sheet metal, with embossed/debossed features that allow torque transfer between the caps, enabling a child-resistant mechanism without the need for additional parts or complex manufacturing processes.

Benefits of technology

The metal safety cap system provides a durable, food-safe, and recyclable child-resistant solution that overcomes the limitations of plastic caps, offering improved sustainability and reduced production costs while maintaining effective child resistance.

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Abstract

A two-part metal safety cap comprises an inner threaded metal cap, which has an internal thread for engaging with a screw thread to seal a container, such as a tin or jar, and an outer cap which surrounds the inner cap. The inner threaded metal cap and the outer cap each have an engagement means which when engaged one with another allow torque to be transferred from the outer cap to attach and remove the inner cap from the container. A retaining device, such as a hem or curled folded portion, retains the inner metal cap within the outer cap whilst permitting the two to rotate freely with respect to one another. Use of electro-magnetic sorting systems are able to temporarily magnetise these metal items enabling them to be removed from the waste stream.
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