Meltblown technology is one of the most effective ways to make very fine, highly efficient filter media. A meltblown fibre has a diameter of less than 10µm, many times finer than a human hair, which has a diameter of 120µm, or a cellulose fibre of about 50µm.
The raw material is a thermo-plastic synthetic material which is melted and forced through an extruder consisting of a very large number of tiny nozzles. Immediately after exiting the nozzles, the individual filaments are blown by hot air in the same direction while still in their semi-melted state, extending them and creating very fine, endless fibres, within a few milliseconds.
Using this dry-laid process, Neenah Gessner can produce media with weights from 10 – 300g/m².
Alternatively, the meltblown can be directly applied to a carrier media [cellulose or spunbond], producing combination media in one step.
PP is the most commonly used polymer. Meltblowns produced from it are mainly used in air filter applications, such as cabin air filters or vacuum cleaner bags. Of particular advantage is our ability to electrostatically charge the meltblown fibres, giving them even higher dust removal efficiency for fine particles.
PC is becoming steadily more popular in air filtration applications. While possessing the same advantages as polypropylene, it gives even higher efficiencies at the same level of air porosity.
PBT is characterised by a very high melting temperature and high resistance to hot or aggressive liquids such as hot oils or biodiesel.
Similar to PBT but has various other advantages when filtering special liquids such as diesel fuel. Otherwise, it is usable in many applications. For bonded nonwovens, it defines itself by its higher melt temperature compared to PA.
Thermo-plastic Polyurathane [TPU]
TPU is a highly elastic product used wherever extremely high stretch is needed, such as in food packaging or pharmaceutical applications, and wherever a good bonding to different substrates is required. Our TPU has FDA approval.
Elastic Polypropylene [ePP]
This is achieved by combining a standard PP with a precisely defined level of elasticity, producing a predictable and defined level of stretch.