Sieve Guide Assembly for Uniform Pharmaceutical Granule Fractionation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fractionating devices for granules in solid dosage forms are inefficient in adjusting the feeding rate and ensuring uniform exposure to the sieve screen, leading to issues such as attrition, non-homogeneous granule distribution, and compromised product quality.
Innovation Solution
A sieve guide assembly is introduced that guides granules through a combination of orbital and lateral flows, ensuring uniform travel distance and reducing attrition, with a specific angular positioning and guide members to direct granules directly to the outlet, minimizing peripheral orbital flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fractionating devices are used without sieve guides, then the device complexity is lower, but the manufacturing precision of particle size distribution and uniformity of granule exposure deteriorates
Solution Approach 1:
The sieve screen is segmented into multiple functional zones by introducing sieve guides that divide the screening area into a first sieving zone and a second sieving zone. This segmentation allows different regions to handle different portions of the granule flow, improving particle size distribution control while maintaining manageable device complexity through modular zone creation.
Solution Approach 2:
Sieve guides are introduced as intermediary components between the granule flow and the sieve screen. These guides act as mediators that direct and distribute granules uniformly across the sieve surface, ensuring consistent exposure and improving manufacturing precision without requiring fundamental changes to the overall device structure.
2Productivity
If granules are fed at high rates, then the productivity increases, but the uniformity of granule exposure to the sieve screen deteriorates
Solution Approach 1:
The sieve guides perform preliminary action by pre-distributing and guiding granules into the correct flow paths before they reach the sieve screen. This preliminary organization of granule flow ensures that even at high feeding rates, the granules are uniformly exposed to the sieve surface, preventing clumping and ensuring consistent screening performance.
Solution Approach 2:
The sieve guides are designed to dynamically adapt to the granule flow, using their geometric configuration to direct material flow in real-time. This dynamic flow management allows the system to maintain uniform granule exposure across the sieve screen while operating at high productivity levels.
3Productivity
If the sieve screen area is increased, then the fractionation capacity increases, but the attrition of granules increases
Solution Approach 1:
Different regions of the sieve screen are assigned different functions through the sieve guide assembly. The first sieving zone handles specific particle size separation while the second sieving zone handles other fractions. This local quality differentiation allows each zone to be optimized for its specific task, reducing overall attrition while maintaining high fractionation capacity through specialized processing.
Solution Approach 2:
By segmenting the sieve screen into multiple zones with dedicated sieve guides, the system can process granules through smaller effective screening areas in each zone rather than forcing all granules through a single large screen. This segmentation reduces the total attrition event count while maintaining overall fractionation capacity.
4Ease of operation
If peripheral orbital flow is allowed, then the granule circulation is improved, but the travel distance and attrition increase
Solution Approach 1:
The invention extracts and eliminates the peripheral orbital flow component by using sieve guides that direct granules radially inward toward the center. This removal of unnecessary peripheral circulation reduces the travel distance granules must cover, thereby reducing attrition while maintaining effective granule circulation through the radial flow path.
Solution Approach 2:
Instead of allowing granules to flow peripherally outward and then circulate back (conventional orbital flow), the sieve guides invert this pattern by directing granules radially inward from the periphery toward the center. This inversion shortens the flow path and reduces attrition while maintaining circulation effectiveness.
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
This solution allows for controlled and efficient fractionation of granules, maintaining desired particle size distribution, flowability, and tabletability, while reducing attrition and ensuring uniform exposure to the sieve screen.
Implementation Method 1
a drive adapted for: (i) in combination with a sieve screen without a sieve guide, inducing a lateral flow of granules defining lateral streamlines and an orbital flow defining orbital streamlines on the sieve screen
Implementation Method 2
a drive adapted for: (i) in combination with a sieve screen without a sieve guide, inducing a lateral flow of granules defining lateral streamlines
Implementation Method 3
a circular sieve screen and a sieve guide mountable in a fractionating device for fractionating granules
Data Source
AI summary
A sieve guide assembly and a method of fractionation using a sieve guide assembly comprising a circular sieve screen (190) and a sieve guide 310 mountable in a fractionating device for fractionating granules for solid dosage forms, such as tablets, capsules or sachets, wherein the fractionating device comprises a drive adapted for: (i) in combination with a sieve screen without a sieve guide, inducing a lateral flow of granules defining lateral streamlines 31a.1. 31b.1, 31c.1, 31d.1 and an orbital flow defining orbital streamlines 31a.2. 31b.2, 31c.2, 31d.2, 31d.3 on the sieve screen (190), and (ii) in combination with the sieve guide assembly, inducing a guided lateral flow of granules defining guided lateral streamlines (331.3) and a central guided orbital flow defining central orbital streamlines (331.2) on the sieve screen (190), whereby the sieve guide assembly is adapted to provide a uniform, controlled and effective exposure of the granules to the sieve screen.