Acid-Resistant Shellac Banding for Two-Piece Hard Capsule Sealing
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Solution Overview
Problem
Existing banding solutions for two piece hard capsules fail to provide adequate acid resistance, leading to separation of capsule parts and diffusion of contents during in vitro testing and in vivo conditions, particularly in acidic environments.
Innovation Solution
A banding composition comprising shellac, alcohol, surfactant, and optional alkali-like ammonia water, which forms an acid-resistant seal between capsule parts, enhancing their resistance to acidic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional banding solutions (gelatin or sealing fluid) are used to prevent capsule separation, then capsule parts are sealed together, but the seal dissolves in acid media during in vitro testing and in vivo conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the banding solution by incorporating shellac (providing acid resistance), alcohol (as solvent), surfactant (for wetting and adhesion), and alkali-like ammonia water (to neutralize acid). This chemical parameter modification enables the seal to withstand acidic conditions while maintaining integrity.
Solution Approach 2:
The banding solution is formulated as a composite material system combining multiple functional components: shellac (acid-resistant polymer), alcohol (solvent), surfactant (surface active agent), and ammonia water (alkaline component). This composite formulation provides both sealing capability and acid resistance that neither component could achieve alone.
2Reliability
If banding solution is applied to prevent content diffusion through capsule gap, then capsule parts are sealed, but the seal fails under mechanical stress during in vitro dissolution testing
Solution Approach 1:
The patent modifies the physical and chemical parameters of the banding solution by adjusting the concentration and interaction of shellac, alcohol, surfactant, and ammonia water. These parameter changes create a seal that maintains structural strength under mechanical stress during dissolution testing while preserving acid resistance.
Solution Approach 2:
The surfactant acts as an intermediary substance that facilitates the bonding between the capsule body and cap surfaces, while the shellac-ammonia water system provides the acid-resistant matrix. This intermediary mechanism enhances seal strength without compromising acid resistance.
3Reliability
If acid resistant banding solution is applied to maintain capsule integrity, then capsule separation is prevented, but the complexity of the banding solution formulation increases
Solution Approach 1:
The banding solution is designed as a multi-functional formulation where each component serves multiple purposes: shellac provides acid resistance and forms the seal matrix, alcohol acts as solvent and contributes to seal flexibility, surfactant provides wetting and adhesion, and ammonia water neutralizes acid and enhances durability. This multi-functionality reduces the need for separate additives.
Solution Approach 2:
By optimizing the concentration ratios and interaction parameters of the four components, the formulation achieves effective sealing and acid resistance with a relatively simple combination, avoiding the need for excessive numbers of ingredients while maintaining performance.
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 solution effectively prevents capsule separation and content diffusion, maintaining integrity during in vitro testing and in vivo stomach conditions, even with low band thickness.
Implementation Method 1
A banding composition comprising shellac, alcohol, surfactant, and optional alkali-like ammonia water, which forms an acid-resistant seal between capsule parts
Implementation Method 2
the capsule shell is acid resistant without any post-fill coating treatment
Data Source
AI summary
The present disclosure relates to acid resistant banding solutions for two piece hard capsules, and methods of making the same. The present disclosure also relates, in part, to a method for banding such capsules which provides an acid resistant seal between the capsule parts and achieves an increased acid resistance in vitro. The instant disclosure further relates to a capsule sealing solution formula that comprises shellac ink or shellac ink vehicle component.