Compostable Multilayer Lid for Coffee Capsule Sealing and Filtration
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Solution Overview
Problem
Current coffee capsules are not compostable, and there is a lack of a compostable lid that meets the requirements of resistance to moisture and pressure, as well as filtering properties to prevent coffee from passing through during percolation in coffee machines.
Innovation Solution
A compostable lid composed of a multilayer complex including a non-woven material with at least 50% biodegradable fibers, an adhesive layer suitable for food contact, and a vegetable parchment support, which is heat-sealable and resistant to pressure, ensuring the lid does not tear and prevents coffee powder from passing through during brewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a compostable lid is used to seal a capsule, then the environmental friendliness is improved, but the resistance to moisture and pressure deteriorates
Solution Approach 1:
The lid is constructed as a multilayer composite material system consisting of a non-woven material layer with biodegradable fibers (at least 50% by weight), an adhesive layer suitable for food contact, and a vegetable parchment support layer. This composite structure combines the compostability of natural fibers with the functional requirements of moisture and pressure resistance, allowing the lid to degrade environmentally while maintaining structural integrity during coffee machine operation.
2Object-affected harmful factors
If a compostable lid is used to seal a capsule, then the environmental friendliness is improved, but the filtering properties deteriorate
Solution Approach 1:
The non-woven material layer is positioned on the inner surface of the lid facing the coffee powder, providing localized filtering properties at the critical interface where coffee contact occurs. This layer has sufficient fiber density and structure to prevent coffee powder passage during percolation while maintaining overall lid compostability through the use of biodegradable fibers throughout the multilayer structure.
3Reliability
If heat-sealable fibers are added to the non-woven material, then the sealing reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The non-woven material incorporates heat-sealable fibers (at least 40% by weight of biodegradable fibers) that can be thermally bonded to seal the lid to the capsule rim. This parameter change in fiber composition enables conventional heat sealing processes to be applied to compostable materials, achieving reliable sealing without requiring complex alternative joining mechanisms.
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 compostable lid effectively seals coffee capsules, maintaining integrity under pressure and temperature conditions in coffee machines, ensuring no coffee powder passes through during brewing and meets compostability standards, making it suitable for use in single-serve espresso machines.
Implementation Method 1
a non-woven material comprising fibers, of which at least 50% by weight of the fibers are composed of biodegradable fibers; an adhesive layer suitable for coming into contact with food; and a support composed of a vegetable parchment
Implementation Method 2
resistance to moisture and pressure, as well as filtering properties to prevent coffee from passing through during percolation in coffee machines
Implementation Method 3
filtering properties to prevent coffee from passing through during percolation
Data Source
AI summary
A compostable lid intended to seal a beverage capsule is provided. The lid is composed of a multilayer complex successively comprising a non-woven material wherein at least 50% by weight of the fibers are composed of polylactic acid (PLA), an adhesive layer suitable for coming into contact with food, and a support layer composed of a vegetable parchment.