KRENN - HOBRAFILT
DEPTHFILTERSHEETS
There are three different mechanisms
of filtration during the filtration through the filter sheets. There are
mechanical depth filtration, electrostatic absorption and electrokinetic
absorption. None of these three mechanisms practically occurs apart of
others during filtration, on the basis of broad dispersion of element size,
but there is always more or less extensive overlapping, which is
eventually crucial for the result of the filtration.
Mechanical filtration - is direct filtration of substances
extraneous through a permeable layer - all substances bigger than the
holes in a filter sheet are mechanically caught.
Electrostatic absorption - there are weak molecular
interactions, so-called Van der Waals' forces, which come up between the
elements of solutions and the material of a filter sheet. Thus it is
ensured that even elements smaller than the size of voids of cellules and
ducts of filter sheets are caught inside the filter plate.
Electrokinetic absorption - is based on the existence of
so-called Zeta-potential and is of use in the plates microbiologically
effective. The excellent effects on electrically negative particles of
impurities, microorganisms and viruses, are achieved by a change of a
filter sheet to electrically positive - so-called Zeta-potential. This is
done by a special adaptation by sanitary polyelectrolytes. Thanks to this
adaptation, particles ten times smaller than the size of voids of the
filter sheet can be caught here.
The filter sheet is basically a
three-dimensional depth filter formed by absorbents with the large inner
surface. We can imagine them as a mesh of differently long cellules and
ducts inside the plate where all impurities are caught. In spite of sieve
filtration, the depth filter sheets with absorbent multiply their total
filter surface and thus the amount of filtered solution is much higher.
Use of the Filter Plates
According to Subject Fields
 |
WINEFILTRATION |
 |
BEERFILTRATION |
 |
BEVERAGEFILTRATION |
 |
PHARMA FILTRATION |
 |
COSMETIC AND CHEMICAL
FILTRATION |
