Composite Container Peelable Membrane Rim Integrity
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Solution Overview
Problem
Conventional composite containers often require excessive force to open, leading to damage of the container and an unsightly appearance when peeling the membrane, which is not aesthetically pleasing and not conducive to high-speed manufacturing processes.
Innovation Solution
A composite container design featuring a metallized Oriented Polypropylene (mOPP) liner ply with a liner sealant and a peelable membrane sealant that remain sealed to each other upon peeling, allowing the membrane to be removed without damaging the rim, using a multilayer structure with a core mOPP layer for separation within the liner ply, and high barrier films for moisture and oxygen protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing methods are used between the membrane and container, then the seal is strong enough to protect the product, but excessive force is required to peel the membrane which damages the container rim and mars the aesthetic appearance
Solution Approach 1:
The mOPP liner ply is segmented into three distinct layers: outer mOPP layer, core mOPP layer, and inner mOPP layer. This segmentation allows the seal to fail at a specific location (the core layer) while maintaining integrity at other locations (outer and inner layers), enabling easy peeling without damaging the container rim.
Solution Approach 2:
Different regions of the mOPP liner ply are given different properties: the outer layer provides structural integrity and adhesion to the membrane, the core layer is designed to separate easily, and the inner layer maintains adhesion to the paperboard. This local differentiation of properties allows the seal to be strong where needed and weak where peeling is required.
2Ease of manufacture
If the membrane is sealed directly to the paperboard body ply, then the container can be manufactured simply, but the paperboard is damaged upon peeling causing unsightly appearance
Solution Approach 1:
The mOPP liner ply acts as an intermediary layer between the membrane sealant and the paperboard body ply. This intermediate layer protects the paperboard from direct contact and damage during peeling, while still allowing the membrane to be sealed effectively to the container.
3Ease of operation
If a multilayer mOPP liner ply structure is implemented to enable clean peeling, then the container can be opened easily without damage, but the device complexity increases
Solution Approach 1:
The liner ply is constructed as a composite material system with three layers of mOPP with different properties. This composite structure combines the benefits of multiple materials in a single integrated component, achieving easy peeling without the need for complex mechanical mechanisms or additional parts.
Data Source
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AI summary
A composite container (10) is provided for holding products (e.g., stacked chips). The container includes a tubular body (15) and a peelable membrane (30). The tubular body is made of at least one paperboard body ply (50) having an inner surface (55) and a metallized Oriented Polypropylene (mOPP) liner ply (60) adhered to the inner surface of the paperboard body ply. A liner sealant (70) is disposed on the inner surface of the mOPP liner ply, and the paperboard body ply and the mOPP liner ply are rolled outwardly to form a rim (35). The membrane, which has a membrane sealant (85) on its inner surface, is sealed to the liner sealant in the area of the rim to close the container. When the membrane is peeled away, the membrane sealant and the liner sealant remain sealed to each other and cause separation within the mOPP liner ply, avoiding tearing and exposure of the paperboard in the rim.