Dry Granulation Gas Stream Homogeneity
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Solution Overview
Problem
Current dry granulation methods face challenges in producing homogeneous granules due to segregation and poor flowability, especially when dealing with small and large particles, and require complex and inefficient separation processes, which affect the quality and stability of tablets.
Innovation Solution
A dry granulation method utilizing a controlled gas stream to separate and transport granules, ensuring consistent flow direction and quantity throughout the process, enhancing porosity and flowability, and using conical hammer sieve granulators and special gas fractioning devices to maintain homogeneity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional dry granulation methods are used to densify powders, then granules can be produced, but the produced granules are not homogeneous and have poor flowability due to segregation between big and small particles
Solution Approach 1:
The invention introduces a gas stream flow dimension to the traditional dry granulation process. The gas stream carries both large and small particles through the system, allowing them to mix and interact in a fluidized state rather than relying on gravity-driven segregation. This dimensional change from static/dropwise processing to continuous gas-phase transport enables homogeneous granule formation while maintaining good flowability.
Solution Approach 2:
The invention uses a gas stream (pneumatic system) to transport and mix particles throughout the granulation process. The gas flow suspends and carries particles through the densification zone, ensuring uniform distribution and preventing segregation. This pneumatic approach replaces traditional mechanical mixing and handling, achieving both homogeneity and flowability simultaneously.
2Manufacturing precision
If roll compaction is used to densify powders, then granules can be produced, but complex separation processes are required to handle dust and small particles, reducing process efficiency
Solution Approach 1:
The invention merges the particle separation and granulation functions into a single integrated process. The gas stream simultaneously transports particles, separates dust from granules through differential suspension, and delivers both to the densification zone. This eliminates the need for separate pre-separation and post-separation steps, significantly improving process efficiency while maintaining granule quality.
Solution Approach 2:
The invention establishes a continuous gas stream flow that continuously transports and processes particles without interruption. The gas phase allows for continuous mixing, separation, and densification in one flowing system, replacing batch-wise mechanical operations. This continuous action eliminates idle time between separation and granulation steps, boosting overall productivity.
3Manufacturing precision
If wet granulation is used to improve bulk homogeneity and flowability, then tablet quality can be improved, but process stability and tablet shelf-life are compromised due to moisture content variations
Solution Approach 1:
The invention uses a dry gas stream environment instead of liquid binders. The gas phase acts as an inert medium that transports particles without introducing moisture. This eliminates the moisture-related stability issues of wet granulation while achieving homogeneous mixing through gas-phase suspension and transport. The process maintains reliable and stable outcomes without compromising tablet shelf-life.
4Device complexity
If direct compression is used to avoid granulation, then the process is simpler and more economical, but APIs with small particles and poor flowability cause segregation during tabletting
Solution Approach 1:
The invention uses pneumatic gas stream processing to dramatically improve bulk flowability. The gas flow suspends and transports particles, creating a fluidized state that enhances flow characteristics. This pneumatic pre-treatment transforms poor-flowing API powders into free-flowing granules, enabling successful compression without the complexity of wet granulation while eliminating segregation issues.
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 method produces granules with improved flowability, homogeneity, and stability, leading to better tablet disintegration and bioavailability, with the ability to handle sensitive materials and enhance porosity without generating undesirable electrical charges.
Implementation Method 1
a gas stream, preferably a negative gas stream, which is used not only for separating granules from small particles, but also as a carrier for transporting the material inside almost all the parts of the system
Implementation Method 2
a gas stream, preferably a negative gas stream, which is used not only for separating granules from small particles
Implementation Method 3
The gas enters the system from the opening (4) located in a part of the compaction chamber (3) and is dragged through the granulator (5)
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~3A
AI summary
It is disclosed an apparatus wherein the gas enters from the opening 4 located in a part of the compaction chamber 3 and is dragged through a granulator 5, a fractioning device 12, a special cyclone 11 and a filter system 8A to a suction fan, which creates the gas stream. In such apparatus the bulk to be compacted 1, the fine particles to be compacted again and the compacted bulk have the same flow direction than the carrier gas. Due to its complete or partial impermeability, the structure of said apparatus makes also possible the use of a gas different from normal air. This is important when the bulk is sensible to oxygen.