Rapid Mixer Granulator

A Rapid Mixer Granulator also known as a High Shear Mixer Granulator, is a specialized piece of equipment widely used in the pharmaceutical, food, chemical, and cosmetic industries for the efficient mixing of dry powders and the formation of wet granules. It plays a crucial role in the wet granulation process, which improves powder flowability, ensures content uniformity, and prepares materials for compression into tablets or capsules. By applying high shear forces, the RMG achieves rapid, uniform blending and granulation in a single vessel, reducing processing time and minimizing contamination risks.

Rapid Mixer Granulator Video

Key Components

The Rapid Mixer Granulator typically consists of the following main parts:

• Mixing Bowl: A conical or cylindrical vessel where materials are loaded. It features a discharge port at the bottom, operated by a pneumatic cylinder for easy unloading.

• Impeller (Main Agitator): A bottom-entry blade that rotates at variable speeds to mix and shear powders, creating a tumbling motion for uniform distribution.

• Chopper: A high-speed side-mounted blade that breaks down agglomerates and forms granules by cutting and milling the wet mass.

• Liquid Binder Inlet: Allows controlled addition of binders during wet mixing.

• Control System: Includes variable speed controls, timers, and safety interlocks.

• Pneumatic and Electrical Systems: Ensure safe operation, with features like oil-free, dust-free process air.

Working Principle

The Rapid Mixer Granulator operates on the principle of high-shear wet granulation, combining mixing and milling in one bowl through mechanical agitation. The process relies on rising, whirling, and tumbling motions induced by the impeller and chopper. Here’s a step-by-step overview:

1. Dry Mixing: Powders are loaded into the bowl. The impeller runs at low to medium speed for 3-5 minutes to achieve uniform blending without granulation.

2. Wet Mixing (Binder Addition): A liquid binder is sprayed or poured in while the impeller continues at a higher speed. This wets the powder, forming a soft mass.

3. Granulation: The chopper activates at high speed for 5-10 minutes, shearing the wet mass into uniform granules. The impeller aids in fluidizing the material to prevent clumping.

4. Discharge: Granules are expelled through the bottom port via pneumatic operation, ensuring complete emptying at a 45-degree angle for efficiency.

Applications

• Pharmaceuticals: Primary use for tablet production; granulates active ingredients with excipients for better flow and compression.

• Food and Nutrition: Mixing and granulating powders for effervescent tablets, baby food, or nutritional supplements.

• Chemicals and Cosmetics: Homogenizing pigments, powders, or formulations requiring uniform particle size.

• Other: Suitable for melt pelletization or high-speed dispersion of dry/effervescent powders.

It excels with poorly flowable powders, enhancing product quality by reducing rejection rates in downstream processes like tableting.

Advantages

• Efficiency: Combines mixing and granulation in one step, saving time and space compared to traditional methods.

• Uniformity: High shear ensures consistent granule size and content distribution, critical for drug efficacy.

• Versatility: Handles dry/wet mixing, aqueous/solvent granulation; scalable from lab (5 kg) to production capacities.

• Safety and Cleanliness: GMP-compliant designs with easy cleaning, interlocks, and contamination controls.

• Low Power Use: Energy-efficient compared to other blenders, with minimal heat generation.

Safety and Validation Considerations

RMGs incorporate safety features like locked hatches, key interlocks, and overload protection to prevent accidents. Validation involves Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ), testing at varying loads for parameters like mixing time and granule uniformity. Always ensure oil-free process air and maintain equipment per manufacturer guidelines to avoid contamination.

Salient Features of Rapid Mixer Granulator

• Better Productivity & short mixing granulation time.

• Uniform mixing & granulation.

• Bowl shape design to have no dead spaces.

• Less handling, more hygienic.

• Meets cGMP & FDA Norms.

• Contact parts are SS 316/316L.

• IQ/OQ documentation can be provided.

• PLC system with Graphical User Interface can be offered.

Process Operation of Rapid Mixer Granulator

Rapid Mixer Granulator working principles are based on two decisive factors essential for the intimate mixing system.

• Spinning close to bottom of mixing bowl.

• The impeller sets the entire mixture in whirling rising.

Tumbling motion ensuring a quick & even distribution of all dry components. This leads to an even distribution of all dry components & an even wetting of every granule. The large lumps occurred during wet mixing are broken up, by the strategically acted chopping tool rotating at 1440/2880 RPM.

The mixture can be discharged with the impeller running through outlet located on the side of the mixing bowl flush to the bottom. Easy accessibility for cleaning is guaranteed by the low profile. The mixing tool is easily removed from the drive shaft providing an unobstructed mixing area which may be cleaned very easily.

Control Systems

• Manual Control – Process Timer for Main Motor & Chopper. AMP Meter for Main Motor of chopper. On/Off Push Button.

• Auto Control – PLC based with touch Screen and password level to feed the parameter of process for Wet / Dry Granulation.

• Pre stored process parameter will help to achieve consistent product quality.

• MMI (Touch Screen) for visualization of machine of specific process condition and data.

• PLC indicates: Visualization of Machine process condition & date. Alarm Signal & Fault Message.

• SCADA package (optional)

Optional Features in Rapid Mixer Granulator

• Flame Proof Motors & operating panel.

• Jacketed bowl for heating & cooling.

• Binder solution adding/spraying device.

• Cleaning in place (CIP) in built.

• IPC Lifter or Vacuum loading system for dust free material charging.

• Variable frequency drive for speed variation.

Technical Specification of  Rapid Mixer Granulator

* Power voltage can be adjusted as per customer’s domestic power voltage requirements.
* Rights of technical improvements & modification reserved.
* Illustrations & dimensions are shown for information purpose only.