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10-02-2009, 09:16 PM #18
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Do you not get sharp stubble from a DE loaded with feathers?
Pressing in does sharpen the stubble as well, because the hairs are held in place by the skin so the razor cuts them straighter across. A teflon-coated blade produces sharp stubble because the resistance is so low that even without the skin's backing the whisker doesn't deflect much as it's being cut, so it cuts fairly straight across. A highly polished bevel, polished on something like 0.1 micron diamond also produces a sufficiently low resistance that the whisker doesn't deflect much as it's being cut, leaving a chisel edge that feels prickly when it grows back.
A razor that has a very sharp cutting edge in the 0.38 micron range (roughly the minimum that verhoeven found) but high cutting friction will tend to cut into the whisker, but as the blade spreads apart the whisker the resistance rises and unless the skin is taut and the razor is pressing down the whisker starts bending, causing the blade to start cutting diagonally and even splitting it lengthwise. This lowers the cutting friction because the fibrin is much stronger and more elastic along their length, and less between the individual bundles. And it also results in stubble that is softer and thinner at the tip when it eventually grows back.Last edited by mparker762; 10-02-2009 at 09:33 PM.