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On 10 Jun 2001, at 21:29, Russ Wolfe wrote: > BUT, when the "paper pack" (that is what is called in the trade) is formed, > the inside pleats are compressed fairly tightly together. Therefore, there > is actually smaller area exposed to the fluid that is being filtered. On the > outside of the pack, the pleats are fanned out, exposing the entire surface > area. It's certainly true that there's less space outside the inside fold of the pleat, but then there's also less space inside the outside pleat. The outside folds are actually tighter than the inside ones, due to the geometry. The effects on flow are equivalent, both provide a small amount of impedance, but if you look at the way the flow dissappates and accumulates thru the pleats you will see that both regions are regions of low flow. Since the fluid flow rate in both regions is low, I doubt if either one matters. While the space outside the paper is certainly limited in both regions, filtering is only done on or in the filter paper, so I really don't think folding has much of an effect. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe