Deliberate orientation by processing in the fluid state

There are essentially four types of process that may be used for producing fibres from polymer chains processed in the fluid state  

Both conventional and liquid-crystal polymers can be processed by melt spinning. The principal requirement is that the polymer must not degrade before becoming molten. Examples are nylon-6, nylon-6,6 and poly(ethylene terephthalate) ( polyester , terylene , or dacron ) for conventional polymers and the Vectra series (see section 12.4.3) among the thermotropic liquid-crystal polymers. 

Many conventional polymers cannot be melt-spun because they degrade before melting. Examples are those used to produce the acrylic fibres, such as Orion and Courtelle , which are based on copolymers of polyacrylonitrile, -fCH2CH(CN), and the cellulosic fibres (see section 1.2). 

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