Recyclable High-Barrier Single-Lip Bag With PE Film Structure
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Solution Overview
Problem
Existing high-barrier single-lip bags are not recyclable due to the use of multiple polymeric materials, making them unsuitable for single-polymer recycling streams, and they require high temperatures for sealing, which complicates the manufacturing process.
Innovation Solution
Designing hermetically sealed single-lip bags using a recyclable high-barrier packaging film composed primarily of polyethylene-based polymers, with up to 95% polyethylene content, and incorporating features like zippers and tear notches to maintain durability and hermeticity while allowing recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-material films (e.g., PVDC, EVOH, Nylon) are used to achieve high barrier properties, then oxygen and moisture barrier performance is improved, but recyclability and environmental sustainability deteriorate
Solution Approach 1:
The patent changes the material composition parameters by using at least 80% polyethylene by weight in the outer layer and at least 50% polyethylene in the inner layer, replacing conventional multi-material compositions. This parameter change enables the film to maintain barrier properties while achieving recyclability through single-stream plastic recycling processes.
Solution Approach 2:
The patent employs composite material structure with specific layer compositions (outer layer, inner layer, and optional barrier layer) where each layer is composed of polyethylene-based materials. The composite structure achieves high barrier performance through the combination of layers while maintaining compatibility for recycling as a single material type.
2Reliability
If conventional multi-material films are used to achieve high barrier properties, then oxygen and moisture barrier performance is improved, but processing complexity and manufacturing costs deteriorate
Solution Approach 1:
The patent applies homogeneity by using polyethylene-based materials throughout the film structure (outer layer, inner layer, and barrier layer). This homogeneous material composition simplifies processing compared to conventional multi-material films, as it eliminates the need for complex separation and handling of different material types during manufacturing and recycling.
3Reliability
If conventional multi-material films are used to achieve high barrier properties, then oxygen and moisture barrier performance is improved, but environmental sustainability and circular economy compatibility deteriorate
Solution Approach 1:
The patent changes the material composition parameters to use at least 80% polyethylene by weight in the outer layer and at least 50% polyethylene in the inner layer. This parameter change enables the film to maintain barrier properties while achieving recyclability through single-stream plastic recycling processes, thereby reducing environmental pollution and supporting circular economy initiatives.
Data Source
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Figure 3A~3B
AI summary
The present invention relates to a hermetically sealed single-lip bag comprising: a front panel, a back panel, a first side panel, a second side panel, a top seal, a first side seal, a second side seal and a bottom seal, wherein the first side seal comprises a top portion bonding the front panel to the back panel, a front leg portion bonding the front panel to the first side panel, and a back leg portion bonding the back panel to the first side panel, and the second side seal comprises a top portion bonding the front panel to the back panel, a front leg portion bonding the front panel to the second side panel, and a back leg portion bonding the back panel to the second side panel, wherein each of the front panel, the back panel, the first side panel, and the second side panel is constructed from a recyclable high-barrier packaging film comprising a machine-direction oriented polyethylene-based exterior film and a polyethylene-based interior film, and the total composition of the polyethylene-based exterior film comprises greater than 90% polyethylene-based materials, by weight, and a transverse direction secant modulus and a machine direction secant modulus, each between 1,000 and 1,800 N/mm2.