Unlike folding quadrants, pleating a fluted filter is not that easy and require some training or some patience. We propose an 8 steps method using symetry to improve the consistency of the pleats.
There are a few different methods to fold a filter paper disc into a funnel-ready quadrant.
We propose an easy 3 steps method bellow.
Have you ever tried to compare filter paper between brands? Found a few cross-reference tables only to find out they contradict each others? You might have wondered how come nobody came up with a standard to describe grades and make sens of this mess?
Both methods turn a flat filter paper disc into a conical shape fitting a standard 60° funnel so it can hold more solution and use gravity filtration more efficiently.
While a quadrant folded filter paper is a disk simply pre-folded in a quarter of a circle, a fluted filter paper has been pre-pleated to minimize the contact surface of the filter with the funnel, decreasing filtration time.