Melt spinning environment

In the inviscid melt spinning process [10] [51], steel wires are formed by the same mechanism as glass fibers. In this case, the process shown in Figure 14 depends on the presence of silicon in the steel formulation and on the presence of carbon dioxide in the process environment. 

J. A. Cicero, J. R. Dorgan, Physical properties and fiber morphology of poly(lactic acid) obtained from continuous two-step melt spinning. J. Polym. Environ. 2001, 1-15. 

Filament interaction with the environment in melt spinning... 

If the polyurethane molecule is allowed to form a three-dimensional structure, it becomes insoluble and neither wet nor dry spinning processes can be used. A chemical spinning process must be used in this case. The trick is to spin the isocyanate-terminated prepolymer at a stage where it forms a viscous melt, and with the jets produced in an environment that contains a chain extender. This chain extender diffuses into the fibers and reacts to couple the prepolymer molecules (Couper, 1985). 

The chemical composition of the fibres, their geometry and the spinning conditions define the range of properties glass transition temperature, melting point, heat stability, combustibility, specific electrical resistance, resistance to environment (humidity, chemical, biological, radiation), dye-ability, solubility and the mechanical properties which are listed in the following chapter. The main characteristics of fibres are listed below. 

Massive amorphous alloys of Feg3 Co ZrjgMo5W2Bj5 composition are produced by suction arc melted alloys to a water-cooled copper form (form of rods or tubes) or one-way rapid quenching on spinning copper dmm (tape). With increase of Co content in the alloy composition the improve of alloy vitrification ability is observed. Another consequence of greater cobalt percentage content is the temperature Curie increase of amorphous materials [2]. However, the disadvantage results from the cobalt content increase is lower corrosion resistance in sulphate environments [2]. 

Tandler B, Schmack G, Vogel R, Blechschmidt D, Lindner R. Melt processing of a new biodegradable synthetic polymer in high-speed spinning and imderpressure spunbonding process. Journal of Polymers and the Environment 2001 9 149-56. 

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