Hi,

Most probably you have wet spinning which means your polymeric solution jet does not dry before reaching the surface of collector. As result, wet fibers  diffuse into each other and they form film. There are several parameters to control the drying time of fibers that you can find some clues in following paper:

http://www.sciencedirect.com/science/article/pii/S0014305714003711

Dear Thanusha,

First of all, investigate parameters like: polymer concentration, solvents (volatility), surrounding conditions, voltage, working distance. The basics. But the most probably, the problem lies in the polymer solution - insufficient viscosity or volatility.

Best regards

Michał W.

Along with the factors mentioned above humidity  and temperature also plays major effect on the evaporation of the solvent from the solution, thereby the fiber formation doesnt occur and film formation is seen.

Best regards,

Arun Bhupathi

I know this is pretty basic but have you tried viewing it under a scanning electron microscope(SEM)? Electrospun fibers usually have a white film like appearance on the collector but when viewed under a SEM you will be able to clearly see the fibers...

it depends on your polymer and the solvents. for example you can use N6 and see the fibers. in articles distance 10 cm and voltage between 14-20  are good. you can exactly see fibers if you choose small collector , during migration of droplet to collector fibers aggregate together and you can see them with naked eye by the way microfiber can be seen

I got new point in electrospinning. in Some SEM pictures bad coating of Au can made nanofibers in small area flat like films. you can do the procedure again by controlling all parameters.