Dry Granulation Vortex Separation for Pharmaceutical Powder
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Solution Overview
Problem
Dry granulation methods in the pharmaceutical industry face challenges in producing granules with optimal flow characteristics, homogeneity, and compressibility, leading to issues such as segregation, capping, and sub-optimal disintegration in tablets, due to the formation of solid bridges and difficulties in managing fine particles and compaction forces.
Innovation Solution
A method involving the application of a compaction force to produce a compacted mass with a mixture of fine particles and granules, followed by separation of fine particles using a gas stream with a vortex device, which separates fine particles and small granules from larger granules without the need for sieves, allowing for the production of granules with improved flowability and compressibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high compaction force is applied in dry granulation, then granule strength is improved, but fine particles are not adequately removed and solid bridges form causing segregation and capping
Solution Approach 1:
The patent segments the granulation process into distinct stages: initial compaction at controlled force to form granules, followed by separate fine particle removal using a vortex device. This segmentation allows optimization of each stage independently - compaction for strength and vortex separation for homogeneity - resolving the contradiction between granule strength and manufacturing precision.
Solution Approach 2:
The patent introduces a vortex device as an intermediary mechanism between compaction and final granule formation. This intermediary selectively removes fine particles through vortex action without requiring high compaction forces, thereby preventing solid bridge formation while maintaining granule strength and homogeneity.
2Manufacturing precision
If low compaction force is applied in dry granulation, then fine particles remain removable, but granule strength and compressibility are insufficient
Solution Approach 1:
The patent applies preliminary compaction at controlled force to form granules with adequate strength, then performs fine particle removal as a subsequent action. This preliminary action ensures granules have sufficient compressibility while leaving fine particles intact for later selective removal, resolving the contradiction between granule strength and manufacturing precision.
3Ease of operation
If wet granulation is used, then granule flow characteristics are improved, but adverse effects occur on API characteristics and tablet quality
Solution Approach 1:
The patent replaces the wet granulation mechanical system (liquid binding) with a dry granulation system using controlled compaction forces and vortex separation. This substitution eliminates harmful liquid effects on APIs while achieving adequate granule flow characteristics through proper particle size distribution and granule morphology control.
4Manufacturing precision
If sieving is used to remove fine particles, then manufacturing complexity increases, but granule homogeneity is improved
Solution Approach 1:
The patent uses a vortex device that operates on pneumatic principles to remove fine particles. The vortex flow creates selective particle ejection based on size and density without requiring complex mechanical sieving apparatus, thereby improving granule homogeneity while minimizing 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
The method produces granules with enhanced flowability and compressibility, reducing segregation and capping issues, and enabling the production of tablets with higher tensile strength and faster disintegration, while avoiding the formation of solid bridges and maintaining the integrity of lightly compacted granules.
Implementation Method 1
separating and removing fine particles and/or small granules from the granules of the compacted mass by entraining the fine particles and/or small granules in a gas stream
Implementation Method 2
the direction of the flow of the gas stream has a component which is contrary to that of the direction of flow of the compacted mass wherein the fine particles and/or small granules are separated and removed from the granules by means of an apparatus comprising fractionating means wherein the fractionating means comprises a device (112) along the axis of which the compacted mass is moved in said gas stream by effect of gravitation wherein the fractionating means is static and comprises a vortex device (300) and wherein the compacted mass moves along a helical path within the device (112)
Implementation Method 3
along the axis of which the compacted mass is moved in said gas stream by effect of gravitation
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The invention provides, inter alia, a method for producing granules from a powder, characterized in that compaction force is applied to the powder to produce a compacted mass comprising a mixture of fine particles and granules and separating and removing fine particles and/or small granules from the other granules by entraining the fine particles and/or small granules in a gas stream. Also provided are apparatus for use in the process and tablets formed by compression of the resultant granules.