Multilayer Compostable Capsule Lid for Pressure and Oxygen Resistance
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Solution Overview
Problem
Existing compostable coffee capsules face challenges in providing a compostable lid that is resistant to humidity and pressure, prevents coffee powder leakage, maintains froth characteristics, and acts as an oxygen barrier, while also integrating seamlessly into existing production lines without significant modifications.
Innovation Solution
A compostable lid composed of a multilayer article featuring a non-woven made of biodegradable fibers, particularly PLA, a vegetable parchment support, and an oxygen barrier layer, ensuring resistance to pressure and humidity, preventing coffee powder leakage, and maintaining oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compostable lid made from biodegradable materials is used, then the lid becomes biodegradable and compostable, but the lid loses resistance to humidity and pressure
Solution Approach 1:
The lid is constructed as a composite structure with multiple layers: an outer layer of biodegradable material (paper or cardboard), an intermediate adhesive layer, and an inner layer of material resistant to humidity and pressure (plastic or aluminum). This composite structure allows the lid to maintain compostability while gaining the necessary mechanical strength and moisture resistance through the combination of different materials.
Solution Approach 2:
The lid is divided into distinct functional layers, each performing a specific function: the outer biodegradable layer provides compostability and structural form, the adhesive layer bonds the components together, and the inner resistant layer provides barrier properties against humidity and pressure. This segmentation allows each layer to be optimized for its specific function while working together as a unified structure.
2Reliability
If a multilayer structure with oxygen barrier layer is added, then oxygen barrier properties are improved, but device complexity increases
Solution Approach 1:
The oxygen barrier layer is integrated into the existing multilayer structure of the lid, combining the barrier function with the structural layers. Rather than adding a separate, standalone barrier component, the oxygen barrier is merged as one of the functional layers within the composite lid structure, thereby achieving oxygen protection without proportionally increasing overall complexity.
Solution Approach 2:
The inner layer of the lid serves multiple functions simultaneously: it provides resistance to humidity and pressure, acts as an oxygen barrier, and maintains the structural integrity of the lid. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving multiple protective functions.
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 lid effectively withstands pressures of 5 to 15 bar, prevents coffee powder leakage, maintains froth characteristics, and limits oxygen ingress, while being compatible with existing capsule production lines.
Implementation Method 1
a lid, comprising an oxygen barrier layer, for sealing a capsule
Implementation Method 2
a non-woven made of biodegradable fibers, particularly PLA
Data Source
AI summary
A compostable lid for sealing a capsule containing coffee in particular, consisting of a multilayer article comprising at least: a non-woven, the fibers of which contain at least 50% by weight of biodegradable fibers, a support consisting of a vegetable parchment, at least one oxygen barrier layer.