Compostable Capsule Using Non-Crosslinked Polysaccharide Cladding
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Solution Overview
Problem
Existing compostable capsules for hot beverages are not economically and ecologically optimal due to non-compostable materials used in their construction, such as plastics and aluminum, and previous solutions involving biodegradable coatings have limitations in durability and manufacturing efficiency.
Innovation Solution
A compostable capsule with a core material of bulk ingredients like coffee powder or tea, coated with a non-crosslinked polysaccharide cladding material that is at least 90% biodegradable within 12 months and 90% fragmentable within 6 months, using materials like carboxymethylcellulose, sodium alginate, or chitosan, which maintains structural integrity during beverage preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plastics or aluminium are used as wrapping material for capsules, then the capsule provides good structural integrity and durability, but the material is not compostable and causes environmental harm
Solution Approach 1:
The patent changes the material parameters from synthetic plastics and metals to natural polysaccharides, specifically using starch-based materials that maintain structural integrity while being compostable. This parameter change transforms the capsule from non-biodegradable to biodegradable, resolving the environmental harm issue while preserving durability through optimized starch formulation and crosslinking.
Solution Approach 2:
The invention uses composite material structures combining starch with other natural polymers and crosslinking agents to create a capsule shell that mimics the structural properties of plastic while being environmentally friendly. The composite approach allows the material to achieve both mechanical strength and compostability simultaneously.
2Object-affected harmful factors
If biodegradable coating materials are used on capsule cores, then the capsule becomes compostable, but the manufacturing complexity and production time increase
Solution Approach 1:
The patent applies preliminary action by pre-coating the capsule core with the biodegradable polysaccharide material before final assembly. This pre-coating approach simplifies the manufacturing process by eliminating the need for post-assembly coating steps, thereby reducing overall manufacturing complexity while ensuring the capsule achieves compostability.
Solution Approach 2:
The invention adopts a disposable capsule design where the entire capsule including the coating is designed for single use and then composting. This approach simplifies manufacturing by eliminating the need for durable, reusable materials and complex cleaning/maintenance systems, focusing instead on low-cost, single-use biodegradable materials that can be easily manufactured and disposed of environmentally.
3Object-affected harmful factors
If the capsule shell is made from compostable materials, then the capsule can be disposed of ecologically, but the shell may lack sufficient durability during beverage preparation
Solution Approach 1:
The patent optimizes the polysaccharide material parameters including molecular weight, degree of substitution, and crosslinking density to achieve the right balance between durability and compostability. By carefully controlling these parameters, the capsule shell maintains sufficient structural integrity to withstand beverage preparation conditions while remaining biodegradable for ecological disposal.
Solution Approach 2:
The invention uses composite material formulations combining multiple polysaccharides and crosslinking agents to create a shell structure that provides enhanced durability during use. The composite structure maintains compostability while achieving the mechanical strength needed to withstand hot water extraction and handling during beverage preparation, then degrades appropriately in composting conditions.
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 provides a durable, compostable solution that retains shape during beverage preparation and is easily removable from brewing machines, meeting ecological and economic standards for home composting, while ensuring the capsule's structural integrity and ease of use.
Implementation Method 1
biodegradation of at least 90% of the material with release of CO2 within 12 months
Implementation Method 2
fragmentation (disintegration) of at least 90% of the material within 6 months
Data Source
AI summary
Compostable capsule for preparing a beverage, in particular a hot beverage, comprisinga core material of a bulk material, in particular selected from the group consisting of coffee powder, tea, cocoa, drinking chocolate, milk powder, instant coffee and dry soup and combinations thereof, anda cladding material encasing the core material, wherein the cladding material is a compostable, non-crosslinked polysaccharide.