Filtration

Hobrafilt N Series

HOBRAFILT deep filtersheets of the “N” series are produced of special types of high-quality cellulose fibres, diatomaceous earth and perlite, which form a three-dimensional, deep filter of a large inner surface.

Characteristic

“N”-series filtersheets can be used in all common applications in industries such as beverages, chemicals and pharmaceuticals, biotechnological applications and cosmetics.

Applications

WineWine
BeerBeer
Alcoholic beveragesAlcoholic beverages
Soft drinksSoft drinks
FoodFood
Chemistry, Biochemistry and CosmeticsChemistry, Biochemistry and Cosmetics
Pharmacy and BiotechnologiesPharmacy and Biotechnologies
Industrial Oil and BiofuelIndustrial Oil and Biofuel

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Filtration mechanism

Three different filtration types as specified below are applied in the filtration process over filtersheets. In practice, normally, none of the three filtration mechanisms occurs separately during filtration due to the wide range of particle size but they are more or less combined, which is decisive for the filtration result.

  1. Mechanical filtration

    Direct filtration of foreign substances. All particles greater than the filtersheet holes are captured mechanically on its surface.

  2. Electrostatic adsorption

    Light molecular interactions, Van der Waals forces, occurring among the particles of solutions and the filtersheet material and ensuring that particles smaller than the dimensions of the sheet's inner pores are captured in the little chambers and channels of the filtersheet.

  3. Electrokinetic adsorption

    This is based on the existence of Zeta potential and is applied in microbiologically effective sheets. Excellent filtration/separation effects towards negatively charged particles of dirt, microorganisms and viruses suspended in the liquid being filtered are achieved through the change of the naturally negative electrokinetic charge of the filtersheet to positive - i.e. Zeta potential. This is achieved by a special treatment with polyelectrolytes that are not harmful to health. This treatment makes it possible to capture particles up to ten times smaller than the dimensions of the filtersheet pores.

HOBRAFILT filter sheets are delivered in the format 20x20, 40x40 and 60x61,4 cm. Based on customer requirements are also supplied other dimensions, such as circular or sheets with various holes, etc.

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