Sliding Moisture-Barrier Lid for Cellulose Tubular Packaging
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Solution Overview
Problem
Existing packaging technologies fail to provide effective moisture-barrier properties while being biosourced, biodegradable, and recyclable, particularly for cylindrical containers.
Innovation Solution
A tubular packaging system comprising a container and a lid that slides over the container, utilizing cellulose-based materials with specific dimensional clearances and functional layers to maintain moisture-barrier properties, and optionally incorporating tamper-evident and air inlet/outlet features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sliding lid design is used for cylindrical packaging, then the packaging can be made from biosourced and recyclable materials with good ease of manufacture, but the moisture-barrier properties deteriorate due to clearance between lid and container
Solution Approach 1:
The patent applies a thin film barrier layer (such as polymer coating or laminated film) on the inner surface of the lid and/or container wall. This flexible film maintains the sliding mechanism's ease of manufacture while providing the necessary moisture barrier properties, resolving the contradiction between manufacturability and moisture protection.
Solution Approach 2:
The packaging uses composite material structure combining biosourced materials (cellulose, paper) for the main body with a functional barrier layer (polymer coating, aluminum foil, or biodegradable barrier material) to achieve both environmental friendliness and effective moisture barrier properties, overcoming the limitation of single-material sliding lid designs.
2Ease of operation
If the lid diameter is made slightly larger than container diameter to enable sliding operation, then the ease of operation improves, but the sealing height and moisture-barrier properties worsen
Solution Approach 1:
A flexible barrier film is applied to the sliding interface between lid and container, allowing the lid to slide freely while maintaining moisture barrier integrity. The film accommodates the diameter difference needed for operation while preventing moisture ingress through the clearance.
Solution Approach 2:
An intermediary barrier layer is introduced between the lid and container walls at the sliding interface. This intermediate film enables the clearance necessary for sliding operation while simultaneously providing the moisture barrier function that would otherwise be compromised by the gap.
3Adaptability or versatility
If cellulose-based materials are used for the packaging, then the environmental friendliness and recyclability improve, but the moisture-barrier properties worsen
Solution Approach 1:
The patent combines cellulose-based materials (providing environmental friendliness and recyclability) with a functional barrier layer (such as biodegradable polymer, plant-based wax, or thin metal coating) to achieve both ecological sustainability and effective moisture barrier properties, resolving the contradiction between environmental performance and functional protection.
Solution Approach 2:
The barrier properties are enhanced by modifying the parameters of the cellulose material itself, such as increasing crystallinity, reducing porosity, or applying surface treatments (coating, laminating) that change the material's moisture permeability while maintaining its biosourced and recyclable nature.
Data Source
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Figure 3~4
AI summary
The invention relates to a packaging (1) comprising a first body that forms a container (2) and a second body that forms a lid (3), the said container (2) and the said lid (3) having moisture-barrier properties at their respective walls (6, 8). The lid (3) has an inner dimension larger than the outer dimension of the container (2) and slides over at least part of the outer surface of the container, in the process defining a sliding length (5) when the packaging is being opened or closed. The clearance created by the difference in the said diameters enables the opening and the closing without adversely affecting the moisture-barrier properties of the packaging (1).