System and method for application and sealing of end closures on containers

The system of mold assembly, mandrel assembly and gas venting assembly solves the compatibility problem between metal bottom sealing components and paper-based containers, realizes efficient sealing of paper-based end closure components and full paper recycling, and improves the sustainability and stability of containers.

CN116234682BActive Publication Date: 2026-06-05SONOCO DEVELOPMENT INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SONOCO DEVELOPMENT INC
Filing Date
2021-08-27
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The metal bottom closure of existing containers is incompatible with paper-based containers, leading to recycling difficulties and impacting sustainability.

Method used

The system, which employs a mold assembly, a mandrel assembly, and a gas venting assembly, achieves efficient sealing of the paper-based end closure through mold positioning, mandrel translation, and gas venting, preventing the membrane cap from arching and the pressure inside the container from increasing.

Benefits of technology

It achieves efficient sealing of paper-based end closures, ensuring the stability of containers during transportation and storage under different climatic conditions, while allowing for full paper recycling of the containers, reducing environmental pollution.

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Abstract

The present invention relates to a system (100) and method for sealing a closure to a container, the system comprising a mold assembly (300), a mandrel assembly (200), and a gas evacuation assembly (400). The mandrel assembly comprises an outer mandrel (210) and an inner mandrel (220). The outer mandrel is configured to translate vertically and constrain a closure in place. The gas evacuation assembly, comprising at least one hollow channel (430) within a mold and one or more channel openings (440) into the interior of the mold, evacuates gas from the interior of an aligned container when the closure is constrained in place. The inner mandrel translates vertically to insert the closure into the container, and a sealing member (40) seals the closure in place.
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