Poly (lactic acid) (PLA) as a thermoplastic and biodegradable material holds good prospect in medical, agricultural, apparel, upholstery, hygiene, and other applications in the form of fiber. Among them, the nonwoven produced with PLA fiber is one of the most important forms. In this paper, the biodegradable properties of PLA fiber were reviewed. Moreover, some manufacturing processes of the biodegradable PLA product, such as spunlaced, spunbonded thermal, spunbonded needle punched, melt-blown were also summarized. It also draws some conclusions about the current problems and the prospect.

With the fiber diameter of electrospun PVDF membrane in lithium cells measured by FE-SEM and the test sample designed by the BBD of RSM , a Quadratic multiple regression model got .The R-Squared(0.9466) and Adeq Precision(13.095) illustrated the model fitted the sample very well , small fluctuations between predicted and actual values also said the same result . Under taking analysis of variance and significance test of the model found that acetone mixed ratio, concentration, interaction of mixing ratio and concentration of acetone, interaction of concentration and electric field strength were significant influencing factors.

Polyester fiber needle-punched nonwovens with different structures were manufactured and their sound absorption properties were examined using the standing wave tube method. The results show that the sound absorption property of the nonwovens depends on their thickness, needling intensity, fiber diameter and surface structure.

Aramids fibers are among the best known of the high-performance, synthetic, organic fibers. Needle-punched nonwoven fabrics with various structures were manufactured and their physical properties, structure, thermal insulation property and acoustic absorption property were examined. The results show that the aramid fiber needle-punched nonwoven fabrics possess good performance at thermal and acoustic insulation besides light mass and inherent flame-resistant.

Electret filter composed of permanently charged electret fibers is a good material for environmental protection. A novel kind of electret melt-blown nonwovens (EMNs) doped with nano-tourmaline was developed by corona charging in this paper. The structure of web, mechanical properties, surface charge density and filtration efficiency of samples were discussed. The results showed that the structure of EMNs became loose and the initial surface charge density was increased markedly. Furthermore, the EMNs exhibited higher filtration efficiency and lower pressure drop, especially the content of nano-tourmaline was about 6 wt. %.