Compostable Beverage Capsule with Metal Barrier Layers
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Solution Overview
Problem
Existing beverage capsules made from materials like aluminium are difficult to recycle and have a negative environmental impact, while biodegradable alternatives suffer from reduced moisture and oxygen tightness, affecting beverage quality.
Innovation Solution
A beverage capsule with a compostable base member and metal barrier layers on either side, providing moisture and oxygen tightness, allowing for easy composting and minimal non-biodegradable material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If beverage capsules are made from biodegradable materials (cellulose, PLA), then environmental impact is reduced and compostability is improved, but moisture and oxygen tightness deteriorates, affecting beverage quality
Solution Approach 1:
The cup-shaped body is constructed as a composite structure combining a biodegradable base member (cellulose or PLA) with a thin metal barrier layer (0.5-30 μm aluminum or aluminum alloy). This composite design integrates the compostability of organic materials with the moisture and oxygen barrier properties of metal, resolving the contradiction between environmental friendliness and beverage quality protection
Solution Approach 2:
The metal barrier layer is applied selectively to specific regions where protection is most needed (typically the base and sides that contact beverage ingredients), while maintaining the overall biodegradable structure. This localized application provides targeted moisture and oxygen protection without requiring complete metal encapsulation, balancing barrier performance with compostability
2Reliability
If beverage capsules are made from aluminium or metal alloys, then moisture and oxygen tightness is improved, ensuring beverage quality, but recyclability deteriorates and environmental impact increases
Solution Approach 1:
The invention creates a hybrid composite where a thin metal layer (providing barrier properties) is combined with a biodegradable base member. This reduces the overall metal content and volume compared to traditional all-metal capsules, improving compostability while maintaining sufficient moisture and oxygen protection through the optimized 0.5-30 μm metal layer
Solution Approach 2:
The metal barrier layer thickness is optimized to the range of 0.5-30 μm, which is sufficient to provide effective moisture and oxygen protection for beverage quality while minimizing the amount of non-biodegradable material. This parameter optimization resolves the contradiction by finding the minimum metal thickness needed for protection
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
Maintains beverage quality and recyclability by ensuring moisture and oxygen tightness while being compostable, reducing environmental impact through minimal non-biodegradable material use.
Implementation Method 1
a barrier layer which covers a side of the base member, wherein the barrier layer is made from a metal and has a thickness between 0,5 μm and 30 μm
Data Source
Figure 1~3A
Figure 2~3B
AI summary
A beverage capsule (10) for use in a beverage preparation machine to prepare a beverage by passing a fluid under pressure therethrough. The beverage capsule comprises: a cup-shaped body (12) having a base (14) and a sidewall (16); and a lid sealed to the sidewall. The cup-shaped body consists of: a base member made from a compostable material; and an inner barrier layer and/or an outer barrier layer which covers an inner, respectively outer, side of the base member, wherein each barrier layer is made from a metal and has a thickness between 0,5 µm and 30 µm.