Melt spinning technique

Improvements in melt spinning techniques and film filament processes have made polypropylene accessible for fiber production. Low-cost fibers made from polypropylene are replacing those made from sisal and jute. 

Reservoir or coaxial fibers can be produced from the glycolide/ lactide polymers (53,55). Two different methods have been investigated. Dunn (53) utilized a melt-spinning technique in which the drug was introduced during the spinning process as a suspension or solution in a suitable lumen fluid. Eenink (55) developed a dry-... 

Figure 6. Compilation of TG/DTA responses for the crystallization of the amorphous alloy PdjjZr which was prepared by the melt-spinning technique. The red data were obtained in hydrogen, the blue data in oxygen. The responses in hydrogen are enlarged by a factor of 10, the enlarged weight curve by a factor of 100 relative top the ordinate scales. A SEIKO instrument was used and gas flows of lOOmlmin-1 were adjusted for sample masses of ca. 4 mg.

Amorphous alloys were prepared by a melt-spinning technique under argon (Bryan et al. 1988). The inner and outer surface of the glassy alloys were characterized by XRD analysis. The influence of an annealing treatment was also studied by differential scanning calorimetry (DSC). 

Poly(bulylene succinate) (PBS) is another biodegradable polymer which is not commonly blended with polyolefins. However, Yang et al. [94] investigated the eflect of PBS content, extrusion rate, and extensional strain rate on the melt strength and extensional viscosity of LDPE/PBS blends using a melt-spinning technique, and developed extensional master curves. Based on both the extensional master curve and a neural network method, they compared the predicted extensional viscosities with the experimental data of the LDPE/PBS blends. 

J. Yang, J.-Z. Liang, F.-J. Li, Melt strength and extensional viscosity of low-density polyethylene and poly(butylene succinate) blends using a melt-spinning technique. J. Macromol. Sci. Part B Phys. 51, 1715-1730 (2012)... 

Melt-spinning techniques that use a solid quenching medium can only be used to produce filaments of flat cross-sections. Various techniques that differ in small details (single roller, twin roller) are in use. They all have in common that the ribbon forms from a liquid puddle that remains in a fixed position on the moving quench medium which is usually a rotating Cu wheel. The width of the ribbon varies with the width of this puddle and the thickness with the penetration depth of the solidification front that moves into the puddle. Only the solidified metal moves with the wheel and this... 

Glass fibers of control diameter (in the 10 pm range) are produced by melt spinning techniques, essentially by pushing a molten glass of appropriate... 

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