Compostable Lid for Capsule Using PLA and PHA Layers
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Solution Overview
Problem
Existing coffee capsules are not compostable, and there is a need for a compostable lid that can withstand the pressures and temperatures encountered in coffee machines while maintaining moisture resistance and aroma barrier properties.
Innovation Solution
A compostable lid composed of two layers: a non-woven material based on polylactic acid (PLA) fibres and a film made from a polyhydroxyalcanoate (PHA) polymer other than PLA, with specific thicknesses and manufacturing processes to ensure pressure, moisture, and aroma resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a compostable lid is used, then environmental compatibility is improved, but pressure resistance and moisture barrier properties deteriorate
Solution Approach 1:
The lid is constructed as a composite material consisting of a non-woven material layer (providing compostability and moisture barrier) and a film layer (providing pressure resistance and aroma barrier). This composite structure allows the lid to simultaneously achieve environmental compatibility and functional performance requirements.
Solution Approach 2:
The lid is divided into two distinct functional layers: a non-woven material layer responsible for compostability and moisture barrier properties, and a film layer responsible for pressure resistance and aroma barrier properties. Each layer performs its specific function, and together they solve the contradiction between environmental compatibility and reliability.
2Loss of substance
If the lid is made thinner to reduce material usage, then compostability is improved, but pressure resistance deteriorates
Solution Approach 1:
By combining a non-woven material with a film in a composite structure, the lid achieves adequate pressure resistance with reduced material thickness. The film layer provides the necessary mechanical strength and pressure resistance while the non-woven material provides compostability, allowing for thinner overall construction compared to single-material solutions.
Solution Approach 2:
Different regions of the lid have different material properties optimized for their specific functions. The film layer provides localized pressure resistance where needed, while the non-woven material provides compostability and moisture barrier properties, allowing for efficient material distribution and reduced overall material usage.
3Strength
If the lid is made thicker to improve pressure resistance, then strength is improved, but compostability deteriorates
Solution Approach 1:
The lid is segmented into two layers with distinct functions: the non-woven material layer (thinner) provides compostability and moisture barrier, while the film layer (thicker) provides pressure resistance. This segmentation allows each layer to be optimized for its specific property, preventing the need to increase overall thickness to maintain compostability.
Solution Approach 2:
The composite structure allows the lid to achieve the required pressure resistance through the film layer without compromising the compostability provided by the non-woven material layer. The combination enables adequate strength with reduced total material thickness compared to a single thick-material solution.
4Device complexity
If a single-layer lid is used, then manufacturing complexity is reduced, but both moisture barrier and pressure resistance cannot be simultaneously achieved
Solution Approach 1:
The lid is segmented into two functional layers that can be manufactured separately and then assembled. This segmentation allows each layer to be optimized for its specific function (moisture barrier vs. pressure resistance) while keeping the manufacturing process relatively simple through standard lamination or bonding techniques.
Solution Approach 2:
The composite material structure combines a non-woven material layer and a film layer to achieve both moisture barrier and pressure resistance properties that cannot be obtained with a single layer. The lamination or bonding process used to combine these layers is a standard industrial process, maintaining acceptable manufacturing complexity.
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 is effectively compostable, resistant to pressures of 5 to 15 bars, maintains moisture barrier properties, and provides a satisfactory aroma barrier, meeting the standards for compostability and performance in coffee machines.
Implementation Method 1
resistant to pressures of 5 to 15 bars
Implementation Method 2
maintains moisture barrier properties
Implementation Method 3
provides a satisfactory aroma barrier
Implementation Method 4
effectively compostable
Implementation Method 5
compostable lid
Data Source
AI summary
Compostable lid for sealing a beverage capsule, composed of a multi-layer complex comprising at least a non-woven material containing fibres, at least 50% of which by weight are polylactic acid fibres (PLA), a film containing a polyhydroxyalcanoate (PHA) polymer other than PLA.