Seamless Capsule Shell for Laundry Detergent Release
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Solution Overview
Problem
Conventional capsules for pharmaceutical applications have seams or joints where two halves meet, which can lead to deleterious interactions with other components in systems like laundry detergents, and direct addition of bluing agents affects the composition's aesthetics.
Innovation Solution
Development of capsules with a continuous shell layer surrounding encapsulated materials, comprising discrete cores with a lipophobic material and an intermediate layer immiscible with aqueous media, using hydrogels or water-soluble polymers for the shell, and incorporating a disintegration aid to control release in aqueous environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capsules with seams or joints are used, then manufacturing is simpler, but reliability deteriorates due to deleterious interactions with other components
Solution Approach 1:
The capsule is divided into two distinct layers: an inner continuous shell layer and an outer discontinuous shell layer. This segmentation allows each layer to perform specific functions - the inner layer provides structural integrity and containment, while the outer layer provides protection and controlled release, thereby improving reliability without excessive complexity
Solution Approach 2:
The capsule utilizes composite material structure with different shell layers having distinct properties. The inner shell layer and outer shell layer are composed of different materials with complementary characteristics, combining the advantages of both materials to achieve both reliability and functional performance
2Ease of manufacture
If bluing agent is added directly to composition, then coloring function is achieved, but aesthetics deteriorate due to visible coloration
Solution Approach 1:
The bluing agent (coloring function) is extracted from the main composition and placed inside encapsulated cores. This separation allows the composition to maintain its natural aesthetic appearance while still providing the color-correcting function through the encapsulated agent that releases under specific conditions
Solution Approach 2:
The capsule shell acts as an intermediary between the bluing agent and the composition. It hides the colored agent from view while allowing its functional effects to manifest, thus preserving aesthetics while maintaining coloring function
3Productivity
If capsule shell is made water-soluble, then controlled release is improved, but stability deteriorates during storage
Solution Approach 1:
Different regions of the capsule structure have different water solubility properties. The inner shell layer has specific solubility characteristics for structural stability, while the outer shell layer has different solubility properties that enable controlled release. This local differentiation allows simultaneous achievement of stability and controlled release functionality
Solution Approach 2:
The capsule shell's water solubility is made dynamic through the two-layer structure. During storage in dry conditions, both layers remain stable. Upon contact with water during use, the outer layer progressively dissolves or degrades to enable controlled release of the inner layer contents, thus adapting its properties based on environmental 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 capsules provide stable protection for encapsulated materials, maintain composition aesthetics by minimizing visual impact of bluing agents, and ensure controlled release in water-based systems like laundry detergents, enhancing their utility in cleaning compositions.
Implementation Method 1
the disintegration aid exhibiting an absorption of 5 grams or more of solution per gram of disintegration aid as measured in an aqueous solution
Implementation Method 2
the disintegration aid exhibiting an absorption of 5 grams or more of solution per gram of disintegration aid as measured in an aqueous solution having an electrical conductivity of about 5 μS/cm or less
Implementation Method 3
the intermediate layer comprising a lipophilic material that is immiscible with or insoluble in aqueous media
Data Source
AI summary
A seamless capsule comprises at least one core and a shell layer. The capsule can further comprise an intermediate layer which surrounds the core(s) and is surrounded by the shell layer. The shell layer comprises a material selected from the group consisting of water-soluble polymers, water-dispersible polymer, hydrogels. The shell layer can further comprise a disintegration aid.