Polyethylene Laminated Packaging for Impact-Resistant Recyclability
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Solution Overview
Problem
Conventional packaging bags with high recyclability suffer from limited impact resistance, leading to potential breakage and leakage during handling and transportation, especially when containing liquids.
Innovation Solution
A laminated body structure comprising a substrate layer and a sealant layer made of polyethylene, with optional intermediate and protective layers, and adhesive layers, designed to achieve specific elongation rates and tensile elastic moduli for enhanced impact resistance and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminated body uses multiple resin materials and paper or metallic materials to achieve functional requirements, then the packaging performance is improved, but the recyclability decreases because the percentage of principal resin falls below 90 mass%
Solution Approach 1:
The invention changes the material composition parameter by using predominantly polyethylene (90 mass% or more) while incorporating functional layers with different properties. The substrate layer uses polyethylene with specific elongation characteristics, and functional layers are added in minimal quantities to maintain recyclability while achieving required packaging performance.
Solution Approach 2:
The invention creates a composite laminated structure where polyethylene substrate layers are combined with thin functional layers (sealant, barrier, adhesive). This composite approach allows the main structure to maintain high polyethylene content for recyclability while the functional layers provide specialized performance characteristics.
2Ease of manufacture
If a laminated body uses a simple polyethylene structure to achieve high recyclability, then the recyclability is improved, but the impact resistance deteriorates leading to breakage and leakage
Solution Approach 1:
The invention applies local quality by giving different regions of the laminated body different properties. The substrate layer has high elongation (0.5-3.0% at 70°C, 2.0-5.0% at 90°C) for impact absorption, while the sealant layer has appropriate adhesion for sealing. Each layer is optimized for its specific function while maintaining overall recyclability.
Solution Approach 2:
The substrate layer's high elongation property acts as a cushioning mechanism that absorbs impact energy before it reaches the contents. The layer deforms elastically under impact (0.5-3.0% at 70°C, 2.0-5.0% at 90°C), preventing breakage and leakage while maintaining package integrity.
3Strength
If the substrate layer has high elongation at 70°C and 90°C to improve impact resistance, then the impact resistance is improved, but the manufacturing precision may deteriorate due to dimensional instability
Solution Approach 1:
The invention carefully selects and controls the elongation parameters within specific ranges (0.5-3.0% at 70°C, 2.0-5.0% at 90°C). These controlled parameter changes allow the material to have sufficient impact resistance while maintaining predictable dimensional behavior during manufacturing processes.
Data Source
AI summary
A laminated body having a structure in which a substrate layer and a sealant layer are laminated in this order, wherein the substrate layer and the sealant layer include polyethylene, and the substrate layer has machine direction (MD) elongation rates of (i) 0.5 to 3.0% when a tension of 50 N/m is applied at 70° C. and (ii) 2.0 to 5.0% when a tension of 50 N/m is applied at 90° C., or a tensile elastic modulus of the substrate layer in a machine direction is 800 to 2000 MPa at 23° C.