UV-Cured Double-Layer Capsule Shell for Water-Soluble Fills
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Solution Overview
Problem
Existing encapsulation methods limit the encapsulation of water-soluble components due to shell permeability, leading to volatility and insufficient isolation of core components.
Innovation Solution
A double-layer seamless capsule is developed using an ultraviolet-curing resin composition for the shell and a water-soluble composition as the fill, reducing volatility through shell permeation and enabling encapsulation of hydrophilic substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a water-soluble composition is used as shell, then the capsule can be produced by conventional dropping method, but the capsule fill is limited to oils and fats only, and water-soluble components cannot be encapsulated
Solution Approach 1:
The invention changes the material parameter of the shell from water-soluble composition to ultraviolet-curing resin composition. This parameter change enables the capsule to encapsulate water-soluble components while maintaining manufacturability through the concentric double nozzle dropping method, resolving the contradiction between versatility and ease of manufacture.
Solution Approach 2:
The invention uses a composite structure where the shell is made of ultraviolet-curing resin composition and the fill contains water-soluble components. This composite material approach allows the capsule to simultaneously achieve compatibility with water-soluble fills and maintain shell integrity through UV curing, addressing both adaptability and manufacturing requirements.
2Loss of substance
If conventional shell materials are used, then the capsule structure is simple, but volatility due to permeation of fill through the shell occurs, leading to loss of aroma components
Solution Approach 1:
The invention changes the chemical composition parameter of the shell to ultraviolet-curing resin, which has low permeability to water-soluble components. This parameter change significantly reduces the loss of volatile aroma components while maintaining a relatively simple capsule structure, addressing the contradiction between substance loss and structural complexity.
Solution Approach 2:
The invention uses a disposable capsule structure with UV-curing resin shell that provides sufficient protection during storage and use. The shell is designed to be simple yet effective, preventing permeation without requiring complex structural elements, thus reducing substance loss while maintaining structural simplicity.
3Reliability
If water-soluble composition is used as fill, then the capsule can contain hydrophilic substances, but isolation of the shell from core components is insufficient, allowing direct contact
Solution Approach 1:
The invention changes the shell material parameter to ultraviolet-curing resin composition, which provides sufficient isolation from water-soluble core components. This parameter change ensures reliable separation while maintaining manufacturing quality through the concentric double nozzle method, resolving the contradiction between isolation effectiveness and manufacturing quality.
Solution Approach 2:
The invention introduces an intermediary layer - the ultraviolet-curing resin shell - between the water-soluble core components and the external environment. This intermediary shell provides effective isolation while allowing the concentric double nozzle method to maintain good encapsulation quality, addressing both reliability and manufacturing 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 capsule effectively seals volatile components, maintaining a mass decrease of less than 5% over 60 days, ensuring long-term stability and isolation of hydrophilic substances.
Implementation Method 1
a capsule shell provided from an ultraviolet-curing resin composition... irradiating the double-layer droplet with ultraviolet rays to cure the capsule-shell solution
Implementation Method 2
a capsule production method utilizing liquid-liquid (filling solution-shell solution, shell solution-cooled oil liquid) interfacial tension
Implementation Method 3
a capsule shell provided from an ultraviolet-curing resin composition... volatility due to permeation of the fill through the shell is decreased
Data Source
AI summary
The present invention addresses the problem of providing a double-layer seamless soft capsule having a water-soluble composition as its fill, and by preparing a capsule shell from an ultraviolet-curing resin composition, a double-layer seamless capsule is made which consists of a capsule shell and a water-soluble composition as a fill and where volatility of the fill due to permeation through the shell is low.