Net-like fabrics

Non-woven fabric n. Fabrics can be produced directly from molten or dissolved fiber-forming substances by several continuous processes flash extrusion The process in which a fiberforming substance in a volatile solvent is extruded from a high-temperature, high-pressure environment into lower temperature and pressure conditions, causing the solvent to rapidly evaporate, leaving a lacy, net-like fabric. 

Polypropylene film fiber is becoming of great commercial interest in many applications such as carpeting and woven sacks. It consists of an extruded film that is slit along the machine direction into narrow, fiber-like ribbons. These ribbons are then woven to make strong fabrics, nets, and sacks. Low-density polyethylene (LDPE) is sometimes blended with PP in slit film applications in order to reduce fibrillation and improve processability. 

Wang X, Ding B, Yu J, Yang J (2011) Large-scale fabrication of two-dimensional spider-web-like gelatin nano-nets via electro-netting. Colloids Surf B Biointerfaces 86(2) 345-352. doi 10.1016/j.colsurfb.2011.04.018... 

Very recently, Wang et al. [11] first fabricated PA-66 nanofiber/net (NFN) membranes that comprise common electrospun nanofibers and two-dimensional (2D) spiderweb-like nano-nets via electrospinning/netting (ESN) technique (Fig. 12.3a). As the second doorkeeper, the average pore size of nano-nets (118 nm) is smaller than the size of test NaCl particles (300 nm), so the nano-nets could filter the nanoparticles mainly through interception mechanism. The filtration efficiency of NFN/PP composite filter was 99.9 % (Fig. 12.3b, c), which can be used as the core filter medium in the air filtration field, such as respiratory protection equipment, HEPA filters, and ultralow penetration air (ULPA) filters. 

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