Is there a way to reduce/eliminate the static buildup in a burr grinder? I've tried a few different coffee grinders and inevitably on removing the grinds bin, I get a spray of coffee all over the counter.
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My grounds bin has a lid. So while the grounds still collect static, they don't fly all over the place when I remove the bin from the grinder. Giving the bin few sharp taps on the counter top prior to opening seems to shake off most of what clings to the top and sides. Then I tap out the grounds, wipe out the bin with a napkin, and I'm ready for the next morning. Beyond that, try switching up your coffee. The cheap "8 O'Clock" stuff I keep on reserve is terribly staticy, while the beans I roast myself don't have nearly the trouble. I tend to enjoy a lighter roast, so keep that in mind - you might benefit from grinding beans with just a bit higher moisture content (of course, if you have a strong preference for dark roasts, this doesn't help much). |
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Pure speculation here: look inside the well where the grounds-catching cup/box goes. If there is any exposed metal in there it might be grounded, so lining the cup with aluminum foil (maybe just partly would work) with a flap that continues outside the cup that could fold down over the outer wall and touch the metal, might have a chance of grounding it out and dissipating the static charge. |
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Tough problem. Static won't persist forever, so waiting a few minutes before opening the drawer may help. Especially in a moderately to highly humidity environment (really dry air is a better insulator than moist air). Of course, you probably don't want to grind your coffee in a sauna, so that doesn't help much. The static charge may be being produced at the grinding surface. If this is the case and one or more of the grinding surfaces is conducting you could try grounding those parts. The charge could also be produced as the ground coffee rubs against other materials between the grinding surface and the catch box. In that case you're not going to have a lot of luck stopping it. A conductive basin could be grounded which will help some. /don't own a burr grinder so this is largely speculative. |
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Well, recently my coffee guy went on holidays for a few weeks, leaving me to go to elsewhere (I gave Kicking Horse Coffee a shot). Interestingly enough, the static issues completely went away. So Knives was definitely on to something in trying different beans. I had tried several different roasts from my local roaster, and they all had the same static issue. I realized that maybe in our dry, cold climate, the freshly roasted beans hadn't had time to reabsorb any moisture from the environment, whereas the beans roasted in a warmer, moist climate would have a decent amount of moisture in the air they are being packed with. So I tried sprinkling about 2 drops of water into the beans bag and shaking it all up. The next day, and for the rest of that 1/2 pound, I've had no static issues at all. |
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The static charge may be being produced at the grinding surface. I think maybe the grinding speed become lower, the less static charge is produced. the burr grinder(espcially conical burr grinder) always works under a very low speed. Also, everytime before grinding, it is better to use a sharp goods to touch the millstone to leak the static on it. |
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A far simpler solution is to steam the beans for a few seconds before grinding. This brings a little oil to the surface and completely eliminates static, even with beans from the freezer (I store my beans frozen to keep them fresh). I put them in a small wire mesh basket to steam them for about 5-10 secs. It may make them clump a bit in the grinder hopper, especially if you get them too oily, but that doesn't hurt and it's far easier to nudge them in the hopper than it is to deal with static. |
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A dark roasted coffee such as a French Roast has a dryer interior (the inside of the bean) so it is more susceptible to static. It has nothing to do with the quality of the coffee. A lighter roasted coffee is heavier and has a higher moister content. I own 9 coffee shops and have ground many types of coffee, the only coffee that gives me static problems is my French Roast. Sorry to say I have not solved the problem and it is very messy. |
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We completely fixed this ANNOYING problem by moving the coffee grinder away from the electrical outlet into which it was plugged when we grind the coffee and empty the well. When not in use, the coffee grinder is against the wall near the outlet. We move it to the front of the counter, away from the wall, before we load it with beans, grind them and empty them into the coffee press or espresso maker, the only 2 methods of brewing coffee in our house. We discovered this by accident and have not had a single encounter with the static problem since. |
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We have the same problem too...I haven't found a total solution, but I have found that spraying the inside of the grinder cup with a fine mist of water before grinding seems to help. I just keep a small spray bottle filled with water near the coffee equipment. |
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Grind your beans the night before and let the coffee sit there til morning. No static! |
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