Wet Film Drying Process with Temperature Rate Control
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Solution Overview
Problem
Conventional film-forming methods for pharmaceutical applications suffer from issues such as self-aggregation, non-uniformity, and inaccuracy in active ingredient distribution, leading to inconsistent dosages and potential harm to patients, due to factors like air pockets and prolonged exposure to heat and moisture, which are not effectively addressed by existing patents.
Innovation Solution
A process involving polyethylene oxide and hydrophilic cellulosic polymers, combined with controlled drying techniques like continuous monitoring of temperature and adjustment of drying parameters, and the use of simethicone to prevent air bubbles, results in rapid-dissolve films with uniform component distribution and reduced aggregation, ensuring accurate and consistent dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drying methods are used with long drying times, then complete drying is achieved, but self-aggregation and non-uniformity occur
Solution Approach 1:
The drying process uses periodic action by alternating between high-temperature rapid drying and lower-temperature maintenance drying phases. This allows the film to dry completely while minimizing aggregation through controlled temperature cycling that prevents excessive heat exposure.
Solution Approach 2:
The invention changes drying parameters dynamically - using high temperature (e.g., 100-200°C) for rapid initial drying to achieve uniformity, then reducing temperature for final drying. This parameter optimization allows complete drying in shorter time while preventing self-aggregation that occurs with conventional constant-temperature drying.
2Productivity
If high temperature drying is used to reduce drying time, then productivity increases, but aggregation and conglomeration of components occur
Solution Approach 1:
The drying process implements periodic action with an initial high-temperature phase for rapid moisture removal, followed by a lower-temperature phase to complete drying without causing aggregation. This time-temperature profile optimization maintains productivity while preserving uniform distribution.
Solution Approach 2:
The invention applies preliminary action by using high temperature briefly to rapidly evaporate bulk moisture before the aggregation-prone phase occurs. This preliminary rapid drying establishes a uniform structure that prevents subsequent aggregation during the slower final drying stage.
3Ease of manufacture
If air pockets are present during film formation, then ease of manufacture is improved, but non-uniformity and dosage inaccuracy result
Solution Approach 1:
The invention extracts air pockets from the film matrix during the drying process through controlled evaporation and degassing. This removal of air pockets eliminates the non-uniformities and dosage inaccuracies that would result from trapped air, while maintaining ease of manufacture through the drying process itself.
4Manufacturing precision
If prolonged exposure to heat and moisture is allowed, then complete drying is achieved, but degradation of active ingredient may occur
Solution Approach 1:
The invention rushes through the critical drying phase by using elevated temperatures to rapidly remove moisture before degradation can occur. This skipping of the prolonged low-temperature exposure period achieves complete drying while minimizing harmful heat and moisture exposure time to the active ingredient.
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 achieves highly uniform and consistent film products with rapid drying times, minimizing aggregation and ensuring accurate active ingredient distribution across the film, meeting stringent regulatory standards for dosage uniformity and patient safety.
Implementation Method 1
A process for drying a wet film with control of loss on drying
Implementation Method 2
continuous monitoring of the temperature of the wet film; and continuously adjusting one or more drying parameters
Data Source
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AI summary
The invention relates to a process for drying a wet film including the steps of: a) determining a desired loss on drying (LOD) for the wet film; b) determining a relationship between LOD and a rate of temperature rise of the wet film or a rate of change of the rate of temperature rise of the wet film; c) drying a wet film with continuous monitoring of the temperature of the wet film; and d) continuously adjusting one or more drying parameters to maintain the rate of temperature rise of the wet film or the rate of change of the rate of temperature rise of the wet film that produces the desired LOD.