Multilayer Container Liner Film for Liquid Cargo Containment
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Solution Overview
Problem
Intermodal containers are not liquid-tight, making them unsuitable for transporting liquid goods without additional containment, which increases handling and costs.
Innovation Solution
A container liner with a film comprising one or more layers, where at least one layer is a polyethylene layer (L1) with specific density and melt mass flow rate properties, providing high flex resistance, dart impact resistance, and tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liner is positioned in an intermodal container to render it suitable for holding liquid goods, then the container becomes liquid-tight and suitable for transporting liquid goods, but the liner is subjected to transportation conditions that cause defects and reduce durability
Solution Approach 1:
The liner is constructed as a multilayer composite structure with at least three layers including an outer layer, an intermediate layer, and an inner layer. Each layer serves specific functions: the outer layer provides mechanical strength and puncture resistance, the intermediate layer provides bonding and flexibility, and the inner layer provides liquid tightness and chemical resistance. This composite structure resolves the contradiction by combining materials with different properties to achieve both adaptability for liquid containment and reliability under transportation stress.
Solution Approach 2:
Different layers of the liner are designed with locally optimized properties tailored to their specific functional requirements. The outer layer has higher tensile strength for structural integrity, the intermediate layer has optimized elongation for flexibility, and the inner layer has specific chemical composition for liquid resistance. This local quality approach allows each region of the liner to excel at its specific function while contributing to overall durability.
2Productivity
If standard intermodal containers are used for transporting goods, then transportation efficiency is improved and costs are reduced, but the containers cannot be used for liquid goods without additional containment
Solution Approach 1:
The liner system provides a universal solution that enables standard intermodal containers to transport both dry and liquid goods using the same container infrastructure. The liner can be installed in conventional dry freight containers, transforming them into liquid-tight containers without requiring specialized container designs. This maintains the productivity benefits of standardized containers while extending their adaptability to liquid cargo.
Solution Approach 2:
The liner acts as an intermediary element between the standard intermodal container and the liquid cargo. It provides the necessary liquid-tight barrier while fitting within the existing container structure, allowing the container to serve dual purposes for both dry and liquid goods transportation.
3Reliability
If additional containment is provided for liquid goods in intermodal containers, then liquid-tight transportation is achieved, but handling complexity and costs increase
Solution Approach 1:
The liner is constructed as a flexible thin-film multilayer structure that can be easily installed and removed from standard containers. This flexible film approach provides liquid-tight containment without the complexity of rigid tanks or sophisticated sealing mechanisms. The liner can be quickly deployed and conforms to the container interior, simplifying handling operations while maintaining reliable liquid containment.
Data Source
AI summary
The present invention relates to a container liner for holding liquid goods, wherein the liner comprises a film comprising one or more layers, wherein at least one of said layers is a layer L1 comprising (a) ≥ 20.0 wt%, preferably ≥ 20.0 and ≤ 80.0 wt%, with regard to the total weight of that layer L1, of a polyethylene P1 having: • a density of > 900 and < 915 kg/m3, preferably of > 905 and < 913 kg/m3 as determined in accordance with ASTM D1505 (2010); • a melt mass flow rate of ≥ 0.1 and ≤ 5.0 g/10 min, preferably of ≥ 0.5 and ≤ 2.0 g/10 min, as determined in accordance with ISO 1133-1 (2011) at 190°C using a load of 2.16 kg; and (b) ≥ 20.0 wt%, preferably ≥ 20.0 and ≤ 80.0 wt%, with regard to the total weight of that layer L1, of a polyethylene plastomer P2 having: • a density of > 880 and < 905 kg/m3, preferably of > 890 and < 904 kg/m3 as determined in accordance with ASTM D1505 (2010); • a melt mass flow rate of ≥ 0.1 and ≤ 5.0 g/10 min, preferably of ≥ 0.5 and ≤ 2.0 g/10 min, as determined in accordance with ISO 1133-1 (2011) at 190°C using a load of 2.16 kg. Such container liner demonstrates a desirably high flex resistance, combined with a high dart impact resistance, and a high tensile strength.