Oct. 21, 2024
Metal filters are used primarily in commercial and industrial/OEM applications. In some applications the goal is to protect downstream components from particulate matter. In other cases, a metal filter can be used to separate, or screen one substance from another. Whether your specific application calls for removing unwanted contaminants from fluid or air, protecting expensive process equipment, or simply separating one material from another, Dorstener Wire Tech can manufacture a custom metal made to order filter for your exact specifications from wire cloth, perforated metal, or expanded metal. Custom fabricated made to order filters can deliver the perfect size dimensions and performance characteristics desired.
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Dorstener quality products are well known, established, and valued by our customers. Successful technology and development management have enabled The Group to improve market positions and penetrate new, often adjacent segments. And as far as new applications, new materials, and new production techniques for wire and mesh products are concerned, the possibilities are far from exhausted.
Our engineers can help with the success of your metal filtration product. The Dorstener Group has been manufacturing custom engineered parts such as wire cloth filters, expanded metal strainers and fabricated perforated metal strainer and filter components for 100 years. We understand how various welds, materials and designs work with different applications.
Our team will work with your engineers to provide made to order filter design assistance or help develop prototypes for any style of metal filtration device imaginable. We have helped turn thousands of ideas into working metal strainer filters, strainers and screens for a wide range of industries. DWT utilizes a collaborative process where our team interacts with your engineering staff every step of the way. Those steps include:
Metal filters are excellent for use in applications that will include continuous exposure to liquid or moisture, or where paper filters do not offer sufficient rigidity or strength. In addition to outstanding durability, there are other inherent design benefits available with metallic filters. Metal filters can be fabricated by welding and crimping, eliminating the need for adhesives or epoxy bonding.
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Unlike paper filters, metallic filters can withstand temperature range in excess of 500° F and can withstand extremely high differential pressures. Depending upon metals used, your filter can be compatible with most caustic fluids. Stainless steel filters, for example, offer a high degree of resistance to corrosion in caustic environments. Best of all, metal filters are inherently cleanable and reusable. Reusable metal filters offer superior service life when compared to paper and cloth filters, and are commonly used in metal cutting, engine and compressor oil, and wastewater applications.
Metal filters can be formed using a variety of techniques. The specifics of your filtration requirement ' particles size, GPM flow rate, contact liquid as well as the physical space limitations into which the filter must fit, all affect the construction type and the filter end formation.
I've been using the Aero Press for about a year with the paper filters it came with. Now that they are almost gone, I decided to buy a reusable filter. I read many reviews and based on them two of the best filters seemed to be the Slimm Filter and the Coffee Nebula. I decided to buy both and do a side by side comparison. They are very different but both earn a 5 star rating from me. Hopefully I can articulate the differences for the buyer so they can make an informed decision.
First, a word about how I make coffee and why, which has a relevance to the first point of differentiation, coffee sludge at the bottom of the mug. I heard the inventor of the Aero Press give a talk about making coffee. Basically, as long as you have clean equipment and water, the next most crucial thing is the temperature of the water. He said above 175F, more of the bitter oils are released from the grind making a more bitter morning brew. Keeping the water between 165-175 makes wonderful coffee overtime, but needs to be microwaved to bring it back to a nice hot drinking temperature. This is why I press into a ceramic mug to microwave, then transfer to a stainless steel travel mug, leaving the sludge behind. So for me the sludge isn't really an issue. For those where it is, the Slimm filter lets through 1/3 to 1/2 the sludge that the Coffee Nebula filter does. All reusable filters let some through compared to paper, but the Slimm is pretty close to paper.
Cleanup. They both only take a few seconds to clean, rinsing them under the faucet. But since the Coffee Nebula is smooth, it is slightly easier. But it takes more effort to scrape the grounds of filter of both. So, not a big difference between them, a non-issue.
Construction: The Coffee Nebula is constructed of a single piece of stainless steel with holes drilled into it. The thing is virtually indestructible. The Slimm Filter appears to be well made. The rim is about the same thickness as the Nebula. It is constructed of two pieces of stainless steel with the ultra fine wire mesh spot welded between them. This may seem weaker, but since it's lying flat on the plastic mesh bottom of the Aero Press, unless you have grinds or something else under the filter, it should be fine.
Seepage rate. The Slimm filter rate is almost the same as paper. So if you have your grind size calibrated for the desired amount of steeping with paper, this is a direct replacement without adjusting your grind. The Coffee Nebula on the other hand has lets the water through at 1/3-1/4 the rate and will require more pressing. I usually calibrate the grind so that I just let the water slowly seep through while I'm making breakfast so I just have to press the last 10-20%. With the Nebula, I'll have to go to a finer grind which will also let more sludge through. On the other hand, my coffee is a little stronger without using more grounds.
Leakage. In a lot of the reviews people complain about leakage, even with the paper. I have never had any leakage period, with either filter or with paper. I suspect they have a defect in the mating surfaces of their Aero Press, it's dirty or they are not screwing on the bottom of the press hard enough. It should not be leaking.
Final note, both filters are great, hopefully now you have enough information to decide which is right for you.
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