Polyvinylidene Chloride Coated Core-Shell Capsule Water Resistance
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Solution Overview
Problem
Existing core-shell capsules with biopolymer shells are not water-resistant, making them unsuitable for high-humidity environments in tobacco heating devices and oral pouch products, as they deteriorate quickly when exposed to moisture.
Innovation Solution
A seamless breakable capsule with a hydrocolloid shell coated in a polyvinylidene chloride film layer, providing water resistance and maintaining burst resistance and audible pop functionality during immersion tests and dissolution tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a biopolymer shell is used for the capsule, then the capsule has good film-forming and absorbent properties, but the capsule is not water-resistant and deteriorates in high-humidity environments
Solution Approach 1:
The patent applies composite materials by combining a biopolymer shell (providing film-forming and absorbent properties) with a polyvinylidene chloride coating layer (providing water resistance). This composite structure allows the capsule to simultaneously achieve good film-forming properties and water resistance, resolving the contradiction between biopolymer advantages and water resistance needs.
Solution Approach 2:
The patent uses a thin film coating of polyvinylidene chloride applied over the biopolymer shell to provide water resistance. This thin film approach maintains the flexibility and film-forming properties of the original biopolymer shell while adding the necessary water barrier function, allowing the capsule to withstand high-humidity environments without deteriorating.
2Reliability
If a moisture barrier coating is applied to prevent capsule deterioration, then the capsule resists humidity for a certain time, but the capsule inevitably disintegrates after a while
Solution Approach 1:
The patent uses a composite material system where polyvinylidene chloride is combined with plasticizers (such as triethyl citrate, glycerol, sorbitol, or polyhydric alcohols) to create a coating that provides both water resistance and long-term durability. This composite approach prevents the capsule from disintegrating over time while maintaining waterproof capability.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the coating by adjusting the ratio of polyvinylidene chloride to plasticizers, and by controlling coating thickness (5-50 μm) and composition. These parameter changes optimize both the water resistance and long-term structural integrity of the coated capsule, preventing disintegration while maintaining waterproof properties.
3Reliability
If the capsule shell is made more resistant to water, then the capsule can withstand high humidity, but the capsule may lose its burst resistance and deformability
Solution Approach 1:
The patent employs a thin film coating (5-50 μm) of polyvinylidene chloride that provides water resistance while maintaining the flexibility and deformability of the underlying biopolymer shell. This thin film approach prevents water penetration without creating a rigid outer layer that would compromise burst resistance, allowing the capsule to both withstand humidity and deform when needed.
Solution Approach 2:
The patent optimizes the coating thickness and composition parameters to balance water resistance with deformability. By controlling the coating thickness within 5-50 μm and adjusting the polyvinylidene chloride to plasticizer ratio, the capsule achieves sufficient water resistance while maintaining the mechanical properties needed for burst resistance and proper function in heating devices.
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 polyvinylidene chloride coating ensures the capsules remain waterproof and retain their burst resistance and ability to emit an audible pop during immersion in water at 60°C for 6 minutes and dissolution in water at 37°C for 20 minutes, extending their application in humid conditions.
Implementation Method 1
the shell being coated with at least one layer of polyvinylidene chloride film coating which gives it water resistance
Implementation Method 2
Encapsulation, which utilizes the film-forming, absorbent, and/or emulsifying properties of macromolecules to trap or coat sensitive compounds in a microcapsule
Implementation Method 3
said shell is coated with a film coating layer which gives it water resistance, said film coating layer comprising polyvinylidene chloride
Data Source
AI summary
The invention relates to a seamless breakable capsule of the core-shell type,the shell comprising a hydrocolloid,the core comprising a flavoring and a lipophilic solvent,characterized in that said shell is coated with a film coating layer that gives it water resistance, said film coating layer comprising polyvinylidene chloride;an oral-use pouch containing said capsule,a consumable product containing said capsule,a tobacco heating device containing said consumable product,a method for manufacturing said capsule,the use of said capsule as an agent for immediate and sustained release of a flavoring, and a method for flavoring an oral-use pouch.