Multilayer Polymer Liner for Pentane Barrier and Vapor Release
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Solution Overview
Problem
Existing packaging materials for EPS granules fail to provide an optimal gas barrier to prevent pentane release while allowing water vapor escape, leading to condensation and safety hazards, and lack sufficient antistatic properties for safe handling.
Innovation Solution
A multilayer polymer packaging liner comprising inner layers of polyamide (PA) or ethylene vinyl alcohol (EVOH) with adhesive layers of maleic anhydride-grafted low-density polyethylene (MAH-LDPE) and outer layers of ethylene copolymers, ensuring a gas barrier for pentane containment and high water vapor permeability, along with antistatic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If packaging material uses polyethylene, polypropylene or polyamide films to prevent water vapor transmission, then water barrier properties are improved, but gas barrier properties deteriorate allowing excessive pentane release
Solution Approach 1:
The packaging liner is divided into multiple functional layers: an inner layer (10) providing water vapor barrier properties, an intermediate layer (20) providing gas barrier properties to prevent pentane release, and an outer layer (30) providing mechanical strength and additional protection. This segmentation allows each layer to specialize in one function, resolving the contradiction between water vapor barrier and gas barrier properties.
Solution Approach 2:
The packaging liner uses a composite structure combining different polymer materials with complementary properties. The inner layer uses hydrophilic polymers (polyamide, polyethylene terephthalate) for water vapor transmission, while the intermediate layer uses hydrophobic polymers (polypropylene, ethylene vinyl alcohol) for gas barrier properties. This composite approach enables simultaneous optimization of both water vapor and gas barrier characteristics.
2Loss of substance
If packaging material provides strong gas barrier to contain pentane, then pentane containment is improved, but water vapor transmission is reduced causing condensation
Solution Approach 1:
The liner is segmented into distinct functional zones: the inner layer (10) specifically designed for water vapor transmission to prevent condensation, and the intermediate layer (20) specifically designed for gas barrier to contain pentane. This functional segmentation resolves the contradiction by assigning opposite permeability requirements to different layers.
Solution Approach 2:
Different regions of the packaging liner have different permeability characteristics tailored to local requirements. The inner layer facing the EPS granules has high water vapor permeability to prevent condensation, while the intermediate layer has low gas permeability to contain pentane. This local quality differentiation resolves the contradiction between water vapor transmission and gas containment.
3Ease of manufacture
If packaging material uses conventional single-layer structure, then manufacturing simplicity is improved, but dual functionality (gas barrier and water vapor transmission) cannot be achieved
Solution Approach 1:
The packaging liner is segmented into three distinct layers (10, 20, 30) with specific functions assigned to each. The inner layer (10) provides water vapor barrier, the intermediate layer (20) provides gas barrier, and the outer layer (30) provides mechanical strength. This segmentation enables dual functionality while maintaining manufacturing simplicity through a standardized multi-layer extrusion process.
Solution Approach 2:
The multi-layer packaging liner structure provides multiple functions simultaneously: water vapor barrier, gas barrier, mechanical strength, and cost optimization. By integrating these functions into a single composite structure, the liner achieves versatility without requiring multiple separate components, thus maintaining ease of manufacture.
4Object-generated harmful factors
If packaging material allows water vapor transmission to prevent condensation, then condensation prevention is improved, but gas barrier properties deteriorate increasing pentane release
Solution Approach 1:
The liner structure segments water vapor management and gas containment functions into separate layers. The inner layer (10) with hydrophilic polymers handles water vapor transmission to prevent condensation, while the intermediate layer (20) with hydrophobic polymers handles gas barrier to contain pentane. This segmentation resolves the contradiction by allowing each layer to optimize for its specific function.
Solution Approach 2:
The packaging liner uses a composite of hydrophilic and hydrophobic polymers in different layers. The hydrophilic inner layer (10) allows water vapor transmission while the hydrophobic intermediate layer (20) provides gas barrier. This composite material approach enables simultaneous achievement of condensation prevention and pentane containment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multilayer liner effectively maintains pentane within EPS granules, prevents water condensation, and ensures safe handling by providing a low surface resistance, enhancing safety and production efficiency.
Implementation Method 1
the adhesive polymer layers provide adhesion between the at least one inner layer and two or more outer layers
Implementation Method 2
providing a gas barrier to contain pentane
Implementation Method 3
allowing water vapor transmission to prevent condensation
Implementation Method 4
The EPS packaging material has a surface resistance of at most 10 12
Data Source
AI summary
The present invention relates to a multilayer polymer packaging liner for packaging of expandable polystyrene (EPS) granulates. The present invention further relates to a method for producing the multilayer polymer packaging liner, and packaging material for EPS granules comprised of the multilayer polymer packaging liner and its use for packaging of EPS granules.