Composite nonwovens processes

Composite nonwoven structures composed of two parallel layers kept at a distance apart can be made by the 3D Web Linker from Laroche, France. This is based on the Nepco Technology shown in Figure 8.12. The two feed webs are linked by vertical fibres generated through needling. The final product is essentially a spacer fabric with a largely hollow centre between the two face webs. This can be further processed to make a variety of composites (Le Roy, 1995 Poillet and Le Roy, 2003). The hollow space may also be filled with other filling materials. Nonwoven spacer fabrics can also... 

We have defined the composite nonwoven sector broadly to encompass the general composite plastic sector plus mixed and hybrid nonwoven processes, and coated and laminated nonwoven materials. This definition encompasses ... 

Composites are also increasingly manufactured by combining two or more nonwoven processes on a single line. 

With this process, spun-bonded and melt-blown nonwovens can be produced and combined. This aiiows the manufacturing of multilayer composite nonwovens in a... 

One of the important aspects of the development of P-plastomers was the expectation that these materials were amenable to plastics processing such as fiber and film formation and yet would yield soft elastic fabrication. This combination was hitherto unknown [24]. The formation of nonwoven fabrics including spun-bond and melt-blown nonwoven fabrics as well as their laminated forms has been documented. Similarly, cast film operation to form elastic monolithic films or composite structures which are not only amenable to these processes, but also to a variety of postfabrication processes have been described. 

Nonwoven mats of cellulose microfibrils were also used to prepare polyurethane composite materials via film stacking method [160], Water-redispersible nanofibrillated cellulose in powder form was recently prepared from refined bleached beech pulp by carboxymethylation and mechanical disintegration [161], However, the carboxymethylated sample displayed a loss of crystallinity and strong decrease in thermal stability limiting its use for nanocomposite processing. 

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