Spray-freezing and freeze drying

Spray-freezing and freeze drying – Freeze Granulation

PowderPro AB develop, manufacture, market and sell equipment and know-how for Freeze Granulationspray freezing and subsequent freeze drying (lyophilization or cryodesiccation). Freeze Granulation was developed in late 1980s at Swedish Ceramic Institute in Göteborg and it is also a development of Spray Freeze Drying (SFD) and Spray Freezing into Liquid (SFL).

Spray cooling or rather called spray freezing is the first step in the freeze granulation process where a suspension is atomized, sprayed with a nozzle, into a chamber with liquid nitrogen. The small droplets are then rapidly frozen with a minimum of ice crystal growth. The frozen material (granules) are then transferred to a freeze dryer where the ice is removed by sublimation, i e never go through a liquid state that ensure homogeneity preservation.

Below you can see an illustration of the Freeze Granulation process.

Please contact us and we will further discuss the opportunities with Freeze Granulation on your powder system and read more on technology and we propose a Granulation Test of your powder system.

Illustration of Freeze Granulation
Illustration of Freeze Granulation

Spray-freezing and freeze drying

Spray-freezing and freeze drying – Freeze Granulation

PowderPro AB develop, manufacture, market and sell equipment and know-how for Freeze Granulationspray freezing and subsequent freeze drying (lyophilization or cryodesiccation). Freeze Granulation was developed in late 1980s at Swedish Ceramic Institute in Göteborg and it is also a development of Spray Freeze Drying (SFD) and Spray Freezing into Liquid (SFL).

Spray cooling or rather called spray freezing is the first step in the freeze granulation process where a suspension is atomized, sprayed with a nozzle, into a chamber with liquid nitrogen. The small droplets are then rapidly frozen with a minimum of ice crystal growth. The frozen material (granules) are then transferred to a freeze dryer where the ice is removed by sublimation, i e never go through a liquid state that ensure homogeneity preservation.

Below you can see an illustration of the Freeze Granulation process.

Please contact us for more information and a test-granulation of your powder system.

Freeze granulation illustration
Freeze Granulation illustration

Pressing of powders

Pressing is the dominating shaping technique for ceramics and powder metals. Submicron and/or composite powders require adequate preparation to achieve a pressing performance that ensures dense compaction into a homogeneous state.

Conventional powder granulation methods (spray drying, sieve granulation etc) show drawbacks. Migration phenomena cause inhomogeneities and hard granules that do not disintegrate properly during pressing.

The preparation of a powder suspension by applying colloidal processing combined with sufficient mechanical treatment provides optimal homogeneity

  • can be preserved by spray freezing and subsequent freeze drying resulting in

Homogeneous powder granules with superior performance made by Freeze Granulation.

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Please contact us and we will further discuss the opportunities with Freeze Granulation on your powder system and read more on technology and we propose a Granulation Test of your powder system.