Paper Closure With Integrated Sealing Layer for Hermetic Packaging
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Solution Overview
Problem
Existing solutions for closures made of paper lack integration of a sealing element, which is essential for hermetic closure and environmental sustainability.
Innovation Solution
A method for making a closure comprising a paper-based closure body and an inner sealing element attached to it, where the sealing element is formed from a sheet material containing a paper layer and a sealing layer, and is integrated during the formation of the closure body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closure body is made of paper instead of plastic to reduce environmental impact, then environmental sustainability is improved, but the ability to integrate a sealing element is lost
Solution Approach 1:
The closure body is constructed as a composite structure comprising a paperboard base layer combined with a sealing layer made of plastic or aluminum. This composite material approach allows the closure to simultaneously achieve environmental sustainability through paperboard usage and functional sealing capability through the integrated sealing layer, directly resolving the contradiction between eco-friendliness and sealing integration
2Reliability
If a sealing element is integrated into a paper-based closure, then hermetic sealing capability is improved, but manufacturing complexity increases
Solution Approach 1:
The sealing element is merged with the paperboard closure body through direct integration methods such as heat sealing, adhesive bonding, or ultrasonic welding. This merging approach creates a unified closure structure where the sealing layer becomes an inherent part of the closure body, achieving hermetic sealing while avoiding the need for separate assembly operations and reducing overall manufacturing complexity
Solution Approach 2:
The sealing layer is pre-applied to the paperboard closure body during the closure manufacturing process, before the closure is assembled with the container. This preliminary action ensures the sealing element is already in position and properly integrated, eliminating the need for complex post-assembly sealing operations and simplifying the overall manufacturing process
3Reliability
If a sealing element is attached to the closure body, then sealing function is improved, but separation of sealing element from closure body becomes necessary during first opening
Solution Approach 1:
The closure structure is segmented into distinct functional layers: a reusable paperboard closure body and a consumable sealing layer. This segmentation allows the sealing element to be easily separated from the closure body during the first opening operation, while the closure body remains intact for potential reuse. The separation is facilitated by designing the sealing layer with appropriate adhesion properties that allow clean detachment
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Method for making a closure (1) for closing a container (100), said closure (1) comprising a closure body (10) made of paper and an inner sealing element (20) attached to the closure body (10), the method comprising the following steps: - providing a sheet material (200) comprising at least a paper layer (202) and a sealing layer (204); - removing an excess portion (204B) of the sealing layer from the sheet material (200) so that the remaining portion of the sealing layer (204) forms the inner sealing element (20) in the sheet material (200); - by means of a forming device (400), forming the sheet material (200), in which the inner sealing element (20) has been previously formed, to realize the closure body (10) having the inner sealing element (20) attached.