„Reliable Filtration“ is HOBRA’s comprehensive mark under which all the company’s products and services in liquid filtration are identified. It is a marketing project which covers everything HOBRA manufactures, offers and supplies in this sphere.
Hobrafilt® depth filter sheets are made of carefully selected and inspected materials, namely from various types of cellulose, high quality kieselguhr, perlites and specially treated resins. Filter sheet is in principle a three-dimensional depth filter that is characterized by the presence of adsorbents, compounds with a large internal surface.
Hobrafilt® filter sheets of the “NT” series were especially developed for economic use during filtration in the beverage, chemical and pharmaceutical industries. The sheet thickness and composition were designed to remove impurities during filtration from a typical production batch so that the sheets have the filtration capacity required for the given filtration. This practically eliminates the unused capacity of sheets and increases efficiency. In case of a high concentration of impurities, we recommend consulting the use of Hobrafilt® filter sheets of the “NT” series with our specialists.
A filtersheet is essentially a three-dimensional, deep filter consisting of adsorbents of a large inner surface. This can be imagined as a labyrinth of little chambers and channels of different lengths inside the sheet where dirt is captured.
Contrary to screen filtration, the presence of adsorbents in a deep filtersheet will multiply the total filtration area and, thereby, increase the quantity of the solution being filtered.
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.
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.
Documents to download:
HOBRAFILT - Depth filter sheets (2.5MB, .PDF)
CONDITIONS FOR SUCCESSFUL FILTRATION using HOBRAFILT filtersheets of the „N“ and „NT“ Series (563.7KB, .PDF)
Hobrafilt instructions with differential pressure specification (581.3KB, .PDF)