Polysaccharide Capsule with Cross-linked Coating for Aroma Preservation
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Solution Overview
Problem
Conventional coffee capsules are expensive, environmentally problematic due to non-recyclability and high energy-intensive production, and do not preserve aroma effectively, while alternative materials face limitations such as instability or taste distortion during brewing.
Innovation Solution
A capsule made of a polysaccharide body with a cross-linked polysaccharide coating, specifically using alginate, which is biodegradable, stable, and acts as an oxygen barrier to preserve aroma and prevent taste distortion, allowing for cost-effective production and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capsules are made of stainless steel, aluminium or plastic material, then the capsules provide stable structure and long-term aroma preservation, but the capsules become expensive, environmentally problematic, and non-recyclable
Solution Approach 1:
The patent changes the material parameters from conventional non-biodegradable materials (stainless steel, aluminium, plastic) to biodegradable polysaccharide materials. This parameter change maintains the protective function for aroma preservation while fundamentally altering the environmental compatibility, making the capsule biodegradable and environmentally friendly without sacrificing structural integrity
Solution Approach 2:
The patent employs composite material structure consisting of polysaccharide capsule body combined with polysaccharide coating layer. This composite approach creates a multi-layer protective system where the capsule body provides structural stability and the coating layer enhances aroma preservation, both made from biodegradable materials to resolve the environmental contradiction
2Object-generated harmful factors
If capsules are made of water-soluble material that dissolves during brewing, then the capsules become biodegradable and environmentally friendly, but the capsule wall material dissolves and becomes part of the beverage causing undesired taste impact
Solution Approach 1:
The patent applies local quality differentiation by using different polysaccharide materials for the capsule body and coating layer. The capsule body uses polysaccharide that provides structural stability and controlled dissolution, while the coating layer uses cross-linked polysaccharide that resists dissolution during brewing. This local differentiation ensures the capsule remains intact during brewing to prevent taste distortion while still being biodegradable
Solution Approach 2:
Instead of making the entire capsule water-soluble as in conventional approaches, the patent inverts the approach by making the outer coating layer cross-linked and dissolution-resistant while keeping the inner capsule body biodegradable. This inversion ensures the capsule maintains structural integrity during brewing to prevent taste distortion, yet remains environmentally friendly through biodegradation after use
3Object-generated harmful factors
If capsules are made of biodegradable material, then the capsules become environmentally friendly and recyclable, but the capsules may lack stability and produce significant aroma loss
Solution Approach 1:
The patent creates a composite structure with polysaccharide capsule body and cross-linked polysaccharide coating layer. The capsule body provides biodegradability and structural stability, while the cross-linked coating layer provides enhanced barrier properties against oxygen and moisture, preventing aroma loss. This composite approach successfully combines biodegradability with reliable aroma preservation
Solution Approach 2:
The patent changes the chemical structure parameter of the polysaccharide coating layer by introducing cross-linking. This cross-linking modifies the physical and chemical properties of the coating, creating a more stable, dissolution-resistant layer that effectively protects the capsule content from oxidation and moisture while maintaining the overall biodegradable nature of the capsule
4Reliability
If capsules use complex construction with multiple materials, then the capsules provide stable structure and aroma preservation, but the production process becomes complex and expensive
Solution Approach 1:
The patent simplifies the material selection by using polysaccharide as the base material for both capsule body and coating layer. The only parameter change required is the cross-linking treatment of the coating layer polysaccharide, which can be achieved through simple chemical treatment. This approach eliminates the need for complex multi-material construction while maintaining effective aroma preservation
Solution Approach 2:
The patent makes the polysaccharide material multi-functional by using it for both the capsule body structure and the protective coating layer. The cross-linking process transforms the same base material into a dissolution-resistant coating, eliminating the need for separate materials and simplifying the production process while maintaining reliable aroma preservation
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 is cost-efficient, environmentally friendly, preserves aroma, and is suitable for various coffee machines, producing biodegradable waste with no taste distortion during brewing.
Implementation Method 1
the at least one coating layer comprises a cross-linked polysaccharide... acts as an oxygen barrier to preserve aroma
Implementation Method 2
the cross-linked polysaccharide was obtained by cross-linking one polysaccharide with a cross-linking agent
Implementation Method 3
the capsule is biodegradable... producing biodegradable waste
Data Source
AI summary
A capsule, in particular for preparing a beverage from beverage powder, in particular coffee from coffee powder, by introducing water into the capsule comprising a capsule body composed of at least one polysaccharide and filled with a powder containing polysaccharide, and the capsule body is encased by at least one coating layer comprising a cross-linked polysaccharide obtained by cross-linking a polysaccharide by means of a cross-linking agent, and a method for producing such a capsule by providing a capsule body composed of at least one polysaccharide filled with a powder composed of polysaccharide, wetting at least part of and preferably the entire capsule body with a solution of a polysaccharide in a solvent or with a dispersion of a polysaccharide in a dispersant, bringing the capsule body into contact with at least one cross-linking agent, and drying the capsule body.