Compostable Capsule Material Resolving Strength and Recyclability Trade-off
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Solution Overview
Problem
Current coffee and tea capsules are not recyclable and have a significant environmental impact due to their non-biodegradable materials, such as aluminum and petroleum-based plastics, which complicates disposal and poses environmental hazards.
Innovation Solution
A compostable capsule container made from a material comprising 10-90% protein binder, 2-75% cellulose, 0.1-80% water, 0.3-15% salt, and optional additives, allowing for complete degradation in household compost and recyclability, with good barrier properties to protect the food powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aluminum or petroleum-based plastic is used for container material, then structural integrity and barrier properties are improved, but recyclability and environmental compatibility deteriorate
Solution Approach 1:
The patent applies composite materials by combining multiple natural substances (cellulose, starch, protein, lignin, chitosan, alginate, pectin, and/or collagen) to create a material that achieves both structural integrity and environmental compatibility. This composite approach allows the container to maintain strength while being fully biodegradable and compostable, resolving the contradiction between durability and recyclability.
2Object-affected harmful factors
If biodegradable material is used for container, then environmental compatibility is improved, but resistance to water and structural stability deteriorate
Solution Approach 1:
The patent uses composite materials combining cellulose, starch, protein, and other natural substances that work together to provide both biodegradability and water resistance. The synergistic interaction of these components allows the container to resist water during use while maintaining full compostability after use, resolving the contradiction between environmental compatibility and water resistance.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the composition ratios and processing conditions of the natural substances. By adjusting parameters such as the proportion of hydrophobic components (like lignin and chitosan) and processing temperature/pressure, the material achieves optimal water resistance while preserving its biodegradable nature, thus resolving the contradiction between water resistance and environmental impact.
3Object-affected harmful factors
If natural compostable material is used, then environmental friendliness is improved, but protection against oxidation and moisture deteriorates
Solution Approach 1:
The patent applies composite materials by combining natural substances with complementary properties: cellulose and starch provide structural base, while lignin, chitosan, and alginate contribute antioxidant and moisture-barrier properties. This composite structure delivers both environmental friendliness and effective protection against oxidation and moisture, resolving the contradiction between these two requirements.
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 compostable material ensures minimal environmental impact, supports recyclability, and maintains structural integrity under extraction conditions, providing effective protection against oxidation and moisture while simplifying production by using a single, biodegradable material for all container components.
Implementation Method 1
the material is completely degraded even in household compost
Implementation Method 2
The material can be completely dissolved in the environment or in water
Implementation Method 3
the material has a low oxygen permeability rate and low water vapor permeability, which means that the container offers good protection against oxidation and moisture
Data Source
AI summary
The present application relates to containers for the preparation of a liquid foodstuff with a capsule-shaped body with a cavity open on one side. A powder of the foodstuff is filled into the cavity. Furthermore, the container comprises a lid with which the open side of the cavity is closed. The base body is made of a compostable material. The material comprises 10-90% by weight of at least one protein binder, 2-75% by weight of at least one cellulose material, 0.1-80% by weight of water, 0.3-15% by weight of at least one salt and 0-40% by weight of an additive.