Particle Coating Reactor Paddle Configuration for Uniform Coating
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Solution Overview
Problem
Existing coating techniques for active pharmaceutical ingredients (APIs) suffer from non-uniformity, particle agglomeration, and scalability issues, leading to challenges in achieving consistent drug formulations and high-volume manufacturing.
Innovation Solution
A reactor system with a stationary vacuum chamber and a paddle assembly, featuring specific paddle configurations and orientations, ensures uniform coating by minimizing dead zones and promoting convective motion, allowing for high-volume manufacturing of uniformly coated API particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray coating is used for API coating, then industrial scalability is achieved, but coating non-uniformity and particle agglomeration occur
Solution Approach 1:
The reactor chamber is divided into distinct zones (coating zone and aggregate prevention zone) with specialized paddle configurations for each zone, allowing simultaneous achievement of uniform coating and agglomeration prevention through segmented functional regions
Solution Approach 2:
Different paddle configurations are used in different zones: outer paddles with specific angles and curvatures in the coating zone for uniform deposition, and inner paddles with different orientations in the aggregate prevention zone, creating local optimizations for each functional requirement
2Manufacturing precision
If paddle assembly with specific configurations is used, then coating uniformity is improved, but device complexity increases
Solution Approach 1:
The paddle assembly employs asymmetric configurations with outer paddles having different geometries (cross-sectional shapes, angles, curvatures) than inner paddles, optimized for their specific zone functions while maintaining overall system coherence through a unified drive mechanism
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 system achieves uniform coating within and between particles, reduces agglomeration, and enhances manufacturing throughput, resulting in consistent drug formulations with high API volume fraction and reduced cycle time.
Implementation Method 1
promoting convective motion
Data Source
AI summary
A reactor for coating particles includes a stationary vacuum chamber to hold a bed of particles to be coated, a chemical delivery system, and a paddle assembly. The paddle assembly includes a rotatable drive shaft and a first plurality of paddles and a second plurality of paddles that extend radially from the drive shaft. The spacing, cross-sections, and oblique angles of the paddles are such that orbiting of the paddles causes the first plurality of paddles and the second plurality of paddles to displace substantially equal volumes in opposite directions in the lower portion of the stationary vacuum chamber.