Oxygen-Impermeable PET Beverage Capsule Design
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Solution Overview
Problem
Existing beverage capsules made of polypropylene allow minor oxygen permeation, requiring additional outer wrappings like TRIPLEX® to preserve organoleptic properties, which increases manufacturing costs and reduces recyclability.
Innovation Solution
A capsule with a body made of oxygen-impermeable polyethylene terephthalate (PET) and sealed with aluminium-polyethylene terephthalate foils, eliminating the need for outer wrappings and enhancing recyclability through removable foil designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the capsule body is made of polypropylene, then the manufacturing cost is reduced and ease of manufacture is improved, but oxygen permeation occurs and organoleptic properties deteriorate
Solution Approach 1:
The capsule body is made of PET (polyethylene terephthalate), a composite material that provides both manufacturing feasibility and superior oxygen barrier properties compared to pure polypropylene, thus resolving the contradiction between ease of manufacture and oxygen permeation resistance
2Object-affected harmful factors
If outer wrapping is added to prevent oxygen permeation, then organoleptic properties are preserved, but device complexity and manufacturing cost increase
Solution Approach 1:
The oxygen barrier function is extracted from the outer wrapping and integrated directly into the capsule body material (PET), eliminating the need for separate outer wrapping layers and thus reducing device complexity while maintaining organoleptic properties preservation
3Object-affected harmful factors
If outer wrapping is added to prevent oxygen permeation, then organoleptic properties are preserved, but recyclability is reduced
Solution Approach 1:
The oxygen barrier function is extracted from multi-layer outer wrapping and integrated into a single-material PET capsule body, which is fully recyclable, thus maintaining organoleptic properties preservation while improving recyclability
4Reliability
If aluminium foil sealing is used, then fluid impermeability is improved, but recycling difficulty increases due to material composite
Solution Approach 1:
The aluminium foil sealing is designed to be removable and separable from the PET capsule body, allowing the foil to be discarded after use while the PET body is recovered for recycling, thus maintaining fluid impermeability during use while improving recycling ease
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 capsule completely seals the beverage from external oxygen, preserving organoleptic properties without additional wrappings and allows for efficient recycling by using PET and recyclable foil materials.
Implementation Method 1
the body is made of plastic material impermeable to fluids, in particular to gases and even more particularly to atmospheric oxygen
Data Source
AI summary
A capsule (10) for preparing a beverage from a powdery or granular raw material is provided with a body (12) of polymeric material, comprising a seat (14) suitable for containing the powdery or granular raw material. The capsule is characterized in that the seat (14) comprises an opening (16) provided with a first edge (18) sealed by a first foil (20) impermeable to fluids. A collection chamber (22) divided from said seat (14) by means of a bottom wall (24) having a second edge (26) projecting in the longitudinal direction (28) is also provided. The edge (26) is sealed with a second foil (30) impermeable to fluids. The body (12) is made of plastic material impermeable to fluids, in particular to gases and even more particularly to atmospheric oxygen.