Fristam PMD – High-Viscosity Powder Mixer

The Fristam PMD Powder Mixer is a hygienic inline mixing system designed to induct powders into viscous liquids and create a fully homogeneous mixture in a single processing step. The system combines direct powder induction with a twin-screw pump and a high-shear rotor–stator mixer to ensure efficient wetting, dispersion and deagglomeration of powders. It is widely used in food, pharmaceutical, cosmetic and chemical manufacturing where powders must be mixed into thick liquids.

The key difference is that the PMD is designed specifically for high-viscosity products. While standard powder mixers typically rely on centrifugal pumps suited to low-viscosity liquids, the PMD uses a twin-screw pump that maintains stable flow even when the product becomes thick during mixing. This makes it ideal for formulations where powder addition rapidly increases viscosity.

The PMD Powder Mixer is typically selected when powder mixing must take place in viscous liquids or thick formulations where conventional powder mixers struggle to maintain flow or dispersion quality.

Typical situations where the PMD is the preferred solution include:

• The base liquid already has a high viscosity
• Powder addition rapidly thickens the product
• Traditional powder mixers struggle to maintain stable flow
• Continuous inline powder mixing is required for process consistency

Typical applications include:

• Polymer hydration
• Cosmetic gel production
• Thickened sauces and condiments
• Personal care formulations such as shampoos or lotions
• Stabilizer or gum dispersion

The PMD Powder Mixer operates as an inline powder induction system. Powder is added into a hopper where it is drawn directly into a flowing liquid stream. A double-screw pump maintains stable flow while the liquid-powder premix passes through a rotor-stator high-shear mixer. The shear forces break down agglomerates and distribute the powder evenly, producing a homogeneous mixture that can be processed immediately or recirculated if required.

Inline powder induction is a mixing method where powders are introduced directly into a flowing liquid stream instead of being added to an open tank. Immediate wetting and high-shear dispersion occur within the pipeline, preventing powder floating and clumping. This approach improves process control, mixing efficiency and repeatability compared with traditional tank mixing.

High-shear mixing is critical because many powders tend to form agglomerates or “fish-eyes” when they contact liquid. The rotor-stator mixer inside the PMD generates intense shear forces that rapidly break down these agglomerates and distribute particles evenly. This ensures faster powder hydration and consistent product quality.

The PMD Powder Mixer can handle a wide range of powders including sugars, proteins, stabilizers, starches, hydrocolloids, gums, polymers and functional additives. It is particularly effective for powders that rapidly increase viscosity or require controlled hydration, such as xanthan gum, guar gum, carbomers and other thickening agents.

PMD powder mixers are used across many hygienic industries, including:

• Food and beverage manufacturing
• Dairy processing
• Pharmaceutical production
• Cosmetics and personal care manufacturing
• Chemical and speciality material production

These industries often require reliable dispersion of powders into liquids while maintaining strict hygiene and product consistency.

Typical applications include:

• Polymer and carbomer dispersion
• Stabilizer or gum hydration
• Cosmetic gel preparation
• Thickened food sauces and condiments
• Detergent or chemical slurry production
• High-viscosity pharmaceutical suspensions

These processes require rapid wetting and controlled dispersion to achieve the desired viscosity and texture.

Yes. The PMD is specifically designed for processes where viscosity increases during powder addition. The integrated double-screw pump maintains a stable product flow even as the mixture thickens, ensuring continuous mixing and preventing process interruptions.

Powder is drawn directly into the liquid stream beneath the hopper, where it is immediately wetted. This controlled powder induction prevents floating powders and surface agglomeration. The mixture then passes through a high-shear rotor-stator mixer which breaks down any remaining agglomerates and distributes particles evenly throughout the product.

Inline powder mixing reduces mixing time, improves repeatability and eliminates many inefficiencies associated with tank mixing. Because powder dispersion occurs immediately within the pipeline, manufacturers can reduce batch times, minimize rework and increase overall plant throughput.

Yes. The PMD is designed according to hygienic processing principles and is suitable for industries such as food, dairy, pharmaceutical and personal care manufacturing. The system is constructed from stainless steel and designed for cleanability in hygienic production environments.

The PMD Powder Mixer is designed for Clean-in-Place (CIP) operation and can be configured for Sterilize-in-Place (SIP) processes where required. This allows the system to be cleaned without disassembly, reducing downtime and ensuring hygienic operation.

Traditional tank mixing relies on bulk agitation to disperse powders. This often leads to floating powders, agglomerates and long mixing times. Inline powder induction systems such as the PMD provide immediate wetting and high-shear dispersion, resulting in faster mixing, more consistent product quality and improved process control.

Yes. The PMD Powder Mixer is designed as an inline processing unit and can be integrated into existing pipelines or recirculation loops. It can operate as part of a continuous production process or be used in batch systems to accelerate powder dispersion and improve product consistency.