Why fluting or buying pre-pleated filter paper instead of using quadrants or flat discs?
The advantage of fluting is two-fold :)
Fluted filters have a cone shape so they fit standard connical funnels (58 or 60°), not Büchner or Hirsh funnels.
Pre-pleated filters need to be tightly packed to save space during transportation and storage which can only be achieved with a shape than can be symetrically folded. This leaves two opposite pleats with three sides instead of two. While it's possible to pleat all the folds with 2 sides, the filters can't be packed efficiently this way and need to be stacked instead:
The last parameter to consider is the number of pleats. It doesn't change the physical properties but help maintaining the connical shape. The more pleats, the more regular the shape is and the easier it will be to pour the solution in the cone. Normaly we increase the number of pleats with the diameter as discussed previously but this can be tailored to your needs.
Before folding the discs, we cut them starting from rolls or sheets. This allow us to cut any diameters.
While we can pleat any size, the smallest and largest are more challenging and in some case need to be folded manually which take a lot more time than our normal process. Moreover to maintain the connical shape of the filter, the number of pleats increase with the diameter.
Here are some example of the most common diameters we pleat:
Our designers can arrange any custom printing, packaging and labeling as an integral part of our Private Label offer.
If you prefer we can also use standard white boxes developped for our clients. We make sure the box sizes match the different diameters, folding and filter paper thickness.