Super Absorbent Polymers

Superabsorbent Polymers (SAP) are polymers that can absorb and retain extremely large volumes of liquid. Amazingly, water absorbing polymers (hydrogels) can absorb and retain up to 500 times their own weight in water. Their absorbency is determined by the type and ratio of cross-linking agents used to make the gel. Low density cross-linked SAPs have a larger absorbent capacity, while the higher cross-linked SAPs have lower absorbent capacity but form firmer gels.

Combining mixing with drying

Hosokawa's Flexomix technology is commonly used to add surface cross-linking agents to SAPs. It can be used to dose powder and liquid in the correct proportions to create a homogenous mixture and is self-cleaning to avoid product build-up which can often be a problem in SAP production.

After mixing, the product can be heat treated using a disc dryer. The disc dryer gently moves the product while the product is heated. In proportion to its compact size, the disc dryer has a very large heat coefficient and a very large energy transfer area, making it well suited to the heat treatment of SAPs.

Flexomix mixer/agglomerator for SAP production

Did you know?

Did you know that the biggest application of superabsorbent polymers by far, is their use in disposable hygiene products such as nappies (diapers), adult protective underwear and feminine hygiene products? They absorb fluids to form a gel, which prevents leakage. Other uses include water-blocking applications in electrical power cables, optical cables, construction works, food packaging and agricultural soil conditioners.


70% of babies worldwide sleep drier and happier thanks to Super Absorbent Polymers produced with Flexomix agglomeration technology!



Try before you buy

Not convinced yet? Consider running a test first. We have a pilot system in our state-of-the-art test facilities in the Netherlands, which is available for testing and toll processing.

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Hosokawa Micron B.V. is a process machinery supplier, providing mixing, drying and agglomeration equipment and systems for the powder and bulk processing industry.