Die Roll Surface Elevation for Soft Gel Capsule Sealing
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Solution Overview
Problem
Rotary encapsulation die rolls used for forming soft gel capsules often result in poor sealing strength and crooked sealing, leading to leakage of the enclosed fill material.
Innovation Solution
The design of the die roll includes a first die surface and a second die surface, with the second surface elevated relative to the first, providing additional room for excess gel at the corners and promoting stronger sealing by maximizing the leading and trailing seam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional die roll design is used, then manufacturing simplicity is maintained, but sealing strength is poor and crooked sealing occurs
Solution Approach 1:
The die roll design incorporates different surface elevations at specific locations: the second die surface is elevated relative to the first die surface to accommodate excess gel at corners, while the third die surface is elevated relative to the fourth to maximize leading and trailing seams. This localized variation in surface quality optimizes sealing at critical areas without requiring complete redesign of the entire die roll structure.
Solution Approach 2:
The die roll features asymmetric surface configurations where opposite surfaces have different elevations. The second die surface is elevated above the first, and the third die surface is elevated above the fourth, creating an asymmetric geometry that specifically addresses sealing issues at corners and seams while maintaining manufacturing feasibility.
2Quantity of substance
If gel ribbon thickness increases, then more fill material can be enclosed, but crooked or pinched corner sealing occurs
Solution Approach 1:
The elevated second die surface creates additional local space at the corners of the cavity, providing room for excess gel when thicker gel ribbons are used. This localized volume increase prevents the gel from being pinched or creating crooked seams, allowing thicker ribbons to be processed while maintaining sealing precision.
3Reliability
If die roll surfaces are made asymmetric with different elevations, then sealing strength is maximized and crooked sealing is reduced, but manufacturing complexity increases
Solution Approach 1:
Rather than making the entire die roll asymmetric, only specific surfaces (second relative to first, third relative to fourth) are elevated by small amounts. This localized approach achieves the reliability benefits of asymmetric design while minimizing the overall manufacturing complexity, as the elevations are confined to specific areas rather than requiring complete asymmetric reconstruction.
Data Source
AI summary
A die roll used to form soft gel capsules via rotary encapsulation are disclosed herein. The die roll has a main body surface around an exterior of a plurality of cavities. The plurality of cavities is arranged in juxtaposed orientations of a trailing portion of one and a leading portion of an immediately neighboring cavity, and the main body surface has an elevated surface between each respective set of the trailing portion of one and the leading portion of the immediately neighboring cavity. Methods of using the die roll in rotary encapsulation and the soft gel capsules formed thereby are also disclosed.