Air gap distances

Nascent fiber in a dry-jet wet-spinning process with a reasonable air-gap distance. (Short-range and random chain structure)... 

Electrospinning is a fabrication process that uses an electric field to control the deposition of polymer fibers onto a target substrate. Fibrous polymer mats, composed of fibers with diameters from several microns down to 100 nm or less, can be fabricated by this electrostatic processing strategy (Figure 24). It is also possible to fabricate complex, and seamless, three-dimensional shapes. Different concentrations, input voltages, air gap distances, delivery rates, and mandrel motion affect the formation and deposition of fibers in the electrospinning process. 

For polymeric hollow fiber membranes, spinning parameters are crucial factors that must be controlled during the preparation of membranes. These parameters include the amount and type of polymers, solvents, additives mixed into the spinning dope solution, the dope and bore fluid rate, the kind of bore fluid, the fiber take-up velocity, the air-gap distance (unless wet spinning is used), and the coagulant bath temperature and the kind of coagulant bath. 

Chung T and Hu X, Effect of air gap distance on the morphology and thermal properties of polyethersulphone hollow fibres , J. Appl. Polym. Sci., 1997,66,1067. 

TABLE 31.1 Permeance Change with Different Air Gap Distances... 

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