Heat-Sealed Can Lid Ring to Isolate the Rolled Metal Edge
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Solution Overview
Problem
The existing metal can lids with a peelable membrane and a metal ring suffer from chemical interactions between the free edge of the roll and the can content, leading to corrosion and sulfidation, which contaminates the product and affects the lid's appearance.
Innovation Solution
A lid structure with a metal ring where the inner annular part includes a crown part extended by a roll, with the outer and inner surfaces of the roll covered in heat-seal material, forming a sealing gasket that prevents interaction between the free edge and the can content by sealing the annular space between connection portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a roll is formed by rolling the metal onto itself to protect the free edge, then the user is protected from cut injuries, but the roll free edge becomes exposed to chemical interactions causing corrosion and sulfidation
Solution Approach 1:
A coating layer is applied to the roll free edge to act as an intermediary barrier between the metal and the can content. This coating prevents direct chemical contact while maintaining the protective function of the roll, thereby eliminating corrosion and sulfidation without compromising user safety.
Solution Approach 2:
The roll structure is transformed into a composite material system by combining metal with a protective coating layer. This composite structure maintains the mechanical protection function while adding chemical resistance through the coating material, simultaneously addressing both safety and corrosion prevention requirements.
2Ease of manufacture
If the roll free edge is left exposed, then the manufacturing process is simpler, but the metal edge chemically interacts with can content causing contamination and dark deposits
Solution Approach 1:
The coating is applied to the roll free edge during the manufacturing process, before the can is filled with content. This preliminary protective action ensures that the metal surface is already protected against chemical interactions, preventing contamination and maintaining product integrity without adding complex post-manufacturing steps.
3Reliability
If heat-seal material is applied to cover the roll surfaces and form a sealing gasket, then the free edge is protected from chemical reactions, but the device complexity increases
Solution Approach 1:
The protective coating and sealing function are merged into a single integrated solution. The heat-seal material serves dual purposes: it forms a protective barrier against chemical reactions and simultaneously creates a sealing gasket to close the annular space. This consolidation reduces the number of separate components and simplifies the overall structure.
Solution Approach 2:
The heat-seal material is designed to perform multiple functions simultaneously: protecting the roll free edge from chemical corrosion, sealing the annular space, and maintaining structural integrity. This multi-functionality eliminates the need for separate protective and sealing components, thereby reducing device complexity while achieving reliable chemical resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sealing gasket effectively prevents chemical reactions between the roll's free edge and the can content, ensuring the product's integrity and appearance by isolating the metal edge from the environment.
Implementation Method 1
said first connection portion and said second connection portion are sealed to each other by means of said heat-seal material to form a sealing gasket closing said annular space
Data Source
AI summary
A lid suitable for closing a metal can includes a metal ring onto which a peelable membrane is sealed. An inner annular part of the metal ring is equipped with a roll defining an annular space therebetween. The first connection portion of the roll and the second connection portion of the inner annular part opposite are sealed to one another by element of a heat-sealing material to form a seal sealing the annular space so at to protect the free edge of the roll. The invention also relates to a method for producing such a lid.