Extrusion spinning

The silk production process must have some built-in temporal, mechanical, and chemical flexibility. This is evident in the ability of the animal to switch from long-duration storage of the proteins (in an aqueous solution state) to high-speed extrusion spinning (into an insoluble fiber with... 

Film Film Lines Extrusion Spinning Coating... 

An interesting variation of the bicomponent fiber idea is the use of air or micropores as the second phase. These fibers have found use in biomedical applications as filter media in artificial kidneys. Robinson has reviewed some recent patents in this area, as well as in the other segments of polymer extrusion, spinning, and processing (34). 

Increased rates of production of about 500 m/min and higher filament dimensional stabilities can be achieved with extrusion spinning or gel or gel extrusion spinnings whereby 35%-55% solutions are spun. Examples of organic fiber formers are poly(acrylonitrile) and poly(vinyl alcohol). Aluminum oxide is an example of inorganic material. 

In gel spinning, extrusion spinning, or gel-extrusion spinning, 35-55% solutions are used. The resulting filaments have a greater dimensional stability because of their lower solvent content, so that the rates of filament production can be greater ( 500 m/min). Polyfacrylonitrile) and poly(vinyl alcohol) are spun by this method. 

Polymer/CNT composite nanofibers can be fabricated by melt processing (such as extrusion, spinning and electrospinning) and solution processing (such as spinning and electrospinning) approaches. 

In the case of extrusion, spinning, injection the fluid polymer is forced to flow from a space of a high cross section through a nozzle of a much smaller cross section. This technological situation may be illustrated as in Figure 3.230. 

IL-dissolved cellulose can easily be reconstituted in water in controlled architectures (fibers, membranes, beads, fiocs, etc.) using conventional extrusion spinning or forming techniques. By incorporating functional additives into the solution before reconstitution. Professor Rogers can prepare blended or composite materials. The incorporated functional additives can be either dissolved (e.g., dyes, complexants, other polymers) or dispersed (e.g., nanoparticles, clays, enzymes) in the IL before or after dissolution of the cellulose. With this simple, noncovalent approach, one can readily prepare encapsulated cellulose composites of tunable architecture, functionality, and rheology. 

Tafel-Extrusionsanlage extrusion plunger Strangpresskolben extrusion punch FlieCpressstempel extrusion spinning Pressspinnen... 

---