Non - Woven - An Overview
Melt-blown process is a one-step process in which high-velocity air blows a molten thermoplastic resin from an extruder die tip onto a conveyor or take-up screen to form a fine fibrous and self-bonding web. The fibres in the melt blown web are laid together by a combination of entanglement and cohesive sticking. The ability to form a web directly from a molten polymer without controlled stretching gives melt blown technology a distinct cost advantage over other systems. Melt blown webs offer a wide range of product characteristics such as random fibre orientation, low to moderate web strength. About 40% of melt blown material is used in the uncombined (monolithic) state. The remainders of melt blown materials are composites or laminates of melt blown webs with another material or nonwoven. The largest end-uses for monolithic melt blown materials are oilsorbents, air and liquid filtration media. This article deals with manufacturing technology, type of polymers used, web characteristics, properties and its various applications.
The melt blown process is a unique among nonwoven systems. MB microfibers generally have diameters in the range of 2 to 4 m, although they may be as small as 0.1 m and as large as 10 to 15 m.