Capsule Encapsulation with Air Escape Passages
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Solution Overview
Problem
Existing capsule encapsulation methods face issues with air entrapment, deformation, and slow disintegration due to high moisture content, which leads to damage and reduced productivity, and are not suitable for hygroscopic tablets, requiring cumbersome drying processes and harsh humidity conditions.
Innovation Solution
The use of capsule portions with a moisture content of 12-16% and an interference fit mechanism, featuring ridges and fluid flow passages for air escape and a tight fit with tablets, allowing encapsulation at ambient conditions without drying, and suitable for both hydrophilic and hydrophobic tablets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capsule portions with high moisture content (18-20%) are used for encapsulation, then the capsule portions are flexible enough to be introduced over the ends of caplets, but air gets entrapped in the capsules and the capsules may get damaged due to air pressure
Solution Approach 1:
The capsule portions incorporate air escape passages that create a controlled porous structure, allowing trapped air to escape during encapsulation while maintaining the structural integrity of the capsule. This resolves the contradiction by providing both flexibility for introduction and reliability through controlled air release.
Solution Approach 2:
The air escape passages act as an intermediary mechanism between the trapped air and the external environment, providing a controlled pathway for air to escape. This mediator prevents direct pressure buildup that would damage the capsule while maintaining the beneficial flexibility of high-moisture capsule portions.
2Ease of manufacture
If capsule portions with high moisture content are used, then the capsule portions can be introduced over caplets without drying, but the capsules get deformed during encapsulation and the shape and size and aesthetic look are spoiled
Solution Approach 1:
The air escape passages create a porous structure that allows controlled deformation during encapsulation while preventing permanent damage. The passages act as stress relief channels that maintain overall capsule shape integrity even when local deformation occurs during the encapsulation process.
Solution Approach 2:
The air escape passages are pre-formed in the capsule portions before encapsulation. This preliminary structural feature ensures that air can escape during the encapsulation process, preventing the pressure buildup that would cause deformation and maintain the capsule's aesthetic appearance.
3Productivity
If capsule portions with high moisture content are used, then encapsulation can proceed without drying, but the capsules are not suitable for encapsulation of hygroscopic or hydrophilic tablets
Solution Approach 1:
The air escape passages create a controlled porous structure that allows the capsule portions to accommodate different tablet types. The passages provide stress relief and controlled deformation pathways that work effectively with both hygroscopic and hydrophilic tablets, enhancing versatility while maintaining high-speed production capability.
4Manufacturing precision
If capsule portions are dried during and after encapsulation to ensure shrink fit, then the shrink fit is achieved, but the process requires considerable energy and increases production time
Solution Approach 1:
The invention extracts the drying step from the encapsulation process by using pre-formed air escape passages that enable shrink fit to occur naturally during encapsulation. The passages allow controlled air escape and deformation that achieves the shrink fit effect without requiring separate drying operations, eliminating time loss and energy consumption.
Solution Approach 2:
The air escape passages are pre-formed in the capsule portions before encapsulation, enabling the shrink fit mechanism to work automatically during the encapsulation process itself. This preliminary structural feature eliminates the need for subsequent drying steps, reducing both production time and energy requirements while maintaining shrink fit quality.
5Stability of the object's composition
If capsule portions are kept at humid conditions to retain moisture content, then the moisture content is maintained, but it is difficult and cumbersome to maintain the humidity conditions
Solution Approach 1:
The capsule portions are designed with inherent air escape passages that enable them to self-regulate moisture content through controlled air exchange. The structure itself provides the moisture management function without requiring external humidity control systems, making the process self-service and eliminating device complexity.
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
Prevents air entrapment and deformation, enhances disintegration and dissolution rates, reduces production time and energy consumption, and maintains the shape and aesthetic quality of capsules, while being suitable for a broader range of tablet types without the need for additional coatings or masking.
Implementation Method 1
fluid flow passages at the inner side of the capsule portions providing an interference fit between the capsule portions and the tablet when the capsule portions are push fitted over the tablet
Implementation Method 2
interference fit means at the inner circumference of the capsule portions providing an interference fit between the capsule portions and the tablet
Implementation Method 3
capsule portions containing a moisture content of 12 to 16%
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Capsule for encapsulating a tablet. The capsule (1) for encapsulating a tablet, comprises two capsule portions (2,3) containing a moisture content of 12 to 16%. Each of the capsule portions comprises interference fit means (4) at the inner circumference thereof having a plurality of fluid flow passages (5) therethrough and providing an interference fit between the capsule portions and the tablet when the capsule portions are push fitted over the tablet from the ends of the tablet in an abutting but not overlapping relationship with each other at ambient conditions. Besides providing an interference fit between the tablets and capsules, the capsules have other advantages. Among the various advantages, they facilitate easy and fast disintegration of the tablets and prevent damage to the capsules during encapsulation of the tablets.