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What are Meltblown Depth Filters ?

Melt-blown depth filters are a common type of filter manufactured via a process in which molten polymer / resin is blown at high velocity from an extruder die tip to create fine fibres. Meltblown filters are often confused with spunbonded products that use a different manufacturing process to form coarser fibre filaments. The meltblown manufacturing process is controlled using advanced software programs that can be adjusted to modify the pore structure of the filter. Meltblown filters with a graded density have coarse outer structures with the structure progressively becoming finer towards the core of the filter element.

Meltblown depth filters are suitable for processes that have a wide variety of particles sizes and require high efficiency filtration. The pore structure produces a network of pores and pathways that together form a tortuous pathway allowing for the capture of a wide distribution of particle sizes. The structure of the meltblown depth filter allows the particles to be collected throughout the depth of the filter. Within a meltblown depth filter, particles invariably travel though the structure until they reach a point where the shape or size of the pore allows for retention, this removal mechanism is known as direct interception and along with inertial impaction is the key removal mechanism found within liquid filtration.

Common particles removed by depth filtration tend to be hard particulate such as sand and metallic rust. The deployment of depth filters is a path well-trodden when faced with the removal of gel like contaminants that elude non depth type filters. Industrial Filtration’s FlowDepth filter range offers true meltblown depth filtration ensuring efficient filtration coupled with high dirt holding capacity.

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