This is a hybrid technique that attempts to combine the benefits of electrospinning and blow spinning techniques. It is explained below:
The blow spinning technique consists of dispensing a solution through an injector, with a flow of air flow running coaxially to the solution jet, surrounding it and sending it towards the collector. Drying is achieved by using the appropriate air flow, i.e. the solvents are evaporated and the material (polymer, etc.) is deposited in the form of fibres on the collector. These are usually fibres with a thicker diameter (for example, several microns) and the fibrous meshes are normally rather inhomogeneous.
The electrospinning technique also sends a jet of a solution from the emitter of an injector to the collector, but in this case using an electric field (high voltage) and not an air flow. Also in this case, drying is achieved by evaporating the solvents and obtaining material in fibre form, although these are usually fibres of a thinner diameter (from nanofibres to fibres that are few microns thick) and the fibrous meshes obtained (electrospun materials) are much more uniform and homogeneous than in the case of blow spinning.
As indicated above, electro-blow spinning is a combination of both techniques: high voltage is applied to the solution to be processed as well as a coaxial air flow. This results in nonwovens – fibre meshes or membranes – with a fibre diameter greater than that obtained with electrospinning (obtaining thick fibres is desirable and sought after in certain applications), although the fibre mesh or membrane is also more homogeneous than those obtained by pure blow spinning, and the homogeneity of nonwoven fibre structures is also usually highly desirable.
In addition to the above, electro-blow spinning sometimes provides a higher throughput than the electrospinning technique.