Same-Material Bag-in-Container Delamination
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Solution Overview
Problem
Integrally blow-moulded bag-in-containers face challenges in material selection for inner and outer layers, requiring compatibility for processing but incompatibility for adhesion, leading to complex production and recyclability issues, with existing solutions often involving different materials and complex layer structures.
Innovation Solution
Using the same polymer for both the inner and outer layers of the preform, which delaminate upon gas introduction, allowing for a simpler preform design and production process, with optional release agents to reduce interfacial adhesion and facilitate delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If different materials are used for inner and outer layers to ensure processing compatibility and adhesion incompatibility, then processing can be achieved, but production complexity increases and recyclability becomes problematic
Solution Approach 1:
The patent applies homogeneity by using the same polymer material for both the inner and outer layers of the bag-in-container structure. This eliminates the need for complex multilayer coextrusion processes and different material selections, while still achieving the required processing compatibility and adhesion characteristics through uniform material properties throughout the structure.
2Reliability
If different materials are used for inner and outer layers, then adhesion incompatibility can be achieved for delamination, but recyclability deteriorates
Solution Approach 1:
By using the same polymer for both layers, the patent enables complete recyclability of the container structure. The uniform material composition allows the entire container to be processed together in recycling streams, eliminating the need to separate different materials while maintaining reliable delamination performance through controlled interfacial properties.
3Reliability
If traditional assembly methods are used with independently produced inner bag and container, then reusability is achieved, but production cost and labour intensity increase significantly
Solution Approach 1:
The patent merges the production of the inner bag and outer container into a single integrally blow-moulded process. The preform is formed as one piece and then blow-moulded to create the final bag-in-container structure, eliminating multiple production steps, assembly operations, and associated labor costs while maintaining the reusable functionality of the container system.
4Productivity
If integrally blow-moulded method is used, then assembly labour is eliminated, but material selection becomes more challenging due to compatibility and adhesion requirements
Solution Approach 1:
The patent simplifies material selection by using a single polymer type for both layers, eliminating the need to navigate complex material compatibility matrices and adhesion requirements. This homogeneous approach maintains high production efficiency through integral blow-moulding while removing the material selection complexity that would otherwise arise from using different materials.
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
This approach enables efficient and reproducible delamination of the inner bag from the outer layer, reducing production complexity and enhancing recyclability, while allowing for thinner, more flexible inner layers and cost savings, with delamination pressures maintained below 0.5 bar and minimal cohesive fracture.
Implementation Method 1
the preform forms a two-layer container upon blow-moulding, and wherein the thus obtained inner layer of the container releases from the thus obtained outer layer upon introduction of a gas at a point of interface between the two layers
Implementation Method 2
with optional release agents to reduce interfacial adhesion and facilitate delamination
Data Source
AI summary
An integrally blow-moulded bag-in-container has as integrally blow-moulded bag-in-container wherein the same polymer is in contact on either side of the interface between the inner and outer layers. A preform for blow-moulding a bag-in-container has an inner layer and an outer layer, wherein the preform forms a two-layer container upon blow-moulding, and wherein the thus obtained inner layer of the container releases from the thus obtained outer layer upon introduction of a gas at a point of interface between the two layers. The inner and outer layers are of the same material.