Fluted Aluminium Coffee Capsule Structure for Deformation Resistance
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Solution Overview
Problem
Existing coffee capsules, particularly those made of aluminium, face issues with deformation during handling and sealing, leading to production challenges and high capital investment, while plastic capsules compromise on quality and recyclability.
Innovation Solution
An aluminium capsule design featuring a fluted side wall and a cellulose-backed seal, with a flange and upstanding wall structure, enhances strength and facilitates easy handling and sealing, allowing for recyclability in common waste streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the capsule is made entirely of plastic material, then manufacturing precision and durability are improved, but environmental biodegradability deteriorates
Solution Approach 1:
The capsule is divided into two distinct materials: a plastic lid portion and a biodegradable cup portion. This segmentation allows each part to be made from materials optimized for its specific function while addressing environmental concerns for the main body of the capsule.
Solution Approach 2:
Different materials are used for different parts of the capsule based on local requirements: the lid uses plastic for durability and sealing, while the cup uses biodegradable material for environmental compatibility. This local quality approach resolves the contradiction by applying material properties where they are most needed.
2Reliability
If the capsule structure is made complex to improve sealing and dispensing, then beverage containment is improved, but device complexity increases
Solution Approach 1:
Instead of making the entire capsule complex to achieve sealing, the invention uses the natural rigidity of the plastic lid portion to provide structural support and sealing surfaces, while the biodegradable cup portion can be simpler in structure. The sealing mechanism is inverted by using the lid's rigidity rather than requiring the cup to be complex.
Solution Approach 2:
The capsule uses composite construction combining plastic and biodegradable materials, where each material contributes its inherent properties to the overall sealing and containment function, reducing the need for complex structural designs.
3Object-affected harmful factors
If the capsule uses separate materials for lid and cup, then environmental biodegradability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The capsule is manufactured as separate components (lid and cup) made from different materials, then assembled together. This segmentation allows each component to be manufactured with optimal precision for its material properties, while the assembly process ensures proper fit and function.
Solution Approach 2:
The connection between the plastic lid and biodegradable cup uses an intermediary joining mechanism that accommodates the different material properties while ensuring precise alignment and secure attachment, maintaining manufacturing precision across material boundaries.
Data Source
Figure 1
Figure 2
AI summary
A capsule for use in a coffee machine having a generally frusto-conical form with a main body 2 and an upper end 3, an annular flange 7 being provided at the end of the main body remote from the upper end. The capsule is provided with a plurality of flutes 11 extending from the vicinity of the boundary between the upper end and main body to a point beyond the mid point between the upper end the flange. The provision of the flutes 11 surprisingly strengthens the capsule.