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TT-7751 NARROW FABRIC NEEDLE LOOM MFL-8/30, YEAR 2014 TO 2015 FOR 1. ZIPPER TAPE 2. SHOE LACE 3. ELASTIC BAND 4. BAND 5. VINYL HOUSE BAND 6. DELIVERY: IMMEDIATELY QUANTITY: 2 SETS Learn More

T-8760 NARROW FABRIC NEEDLE LOOM, YEAR 2015, REED WIDTH 30mm 220 VOLTS TO 440 VOLTS 50 TO 60Hz FOR ZIPPER TAPE, SHOELACE, ELASTIC BAND BAND, VINYL HOUSE BAND QUANTITY: 2 SETS Learn More

Federal health officials have now recommended that we cover our faces with fabric during the coronavirus pandemic. But what material offers the most protection?

The Centers for Disease Control and Prevention has posted a no-sew mask pattern using a bandanna and a coffee filter as well as a video on making masks using rubber bands and folded fabrics found at home.

While a simple face covering can reduce the spread of coronavirus by blocking outgoing germs from coughs or sneezes of an infected person, experts say there is more variation in how much homemade masks might protect the wearer from incoming germs, depending on the fit and quality of the material used.

Scientists around the country have taken it upon themselves to identify everyday materials that do a better job of filtering microscopic particles. In recent tests, HEPA furnace filters scored well, as did vacuum cleaner bags, layers of 600-count pillowcases and fabric similar to flannel pajamas. Stacked coffee filters had medium scores. Scarves and bandanna material had the lowest scores, but still captured a small percentage of particles.

If you don’t have any of the materials that were tested, a simple light test can help you decide whether a fabric is a good candidate for a mask.

“Hold it up to a bright light,” said Dr. Scott Segal, chairman of anesthesiology at Wake Forest Baptist Health who recently studied homemade masks. “If light passes really easily through the fibers and you can almost see the fibers, it’s not a good fabric. If it’s a denser weave of thicker material and light doesn’t pass through it as much, that’s the material you want to use.”

Researchers say it’s important to remember that lab studies are conducted under perfect conditions with no leaks or gaps in the mask, but the test methods give us a way to compare materials. And while the degree of filtration for some homemade masks seems low, most of us — who are staying home and practicing social distancing in public — don’t need the high level of protection required for medical workers. More important, any face covering is better than none, especially if worn by a person who has the virus but doesn’t know it.

The biggest challenge of choosing a homemade mask material is to find a fabric that is dense enough to capture viral particles, but breathable enough that we can actually wear it. Some items being touted online promise high filtration scores, but the material would be unwearable.

Dressing Up for Work … at Home
Yang Wang, an assistant professor of environmental engineering at Missouri University of Science and Technology, worked with his graduate students to study various combinations of layered materials — including both air filters and fabric. “You need something that is efficient for removing particles, but you also need to breathe,” said Dr. Wang, who last fall won an international award for aerosol research.

To test everyday materials, scientists are using methods similar to those used to test medical masks, which everybody agrees should be saved for medical workers who are exposed to high doses of virus from seeing infected patients. The best medical mask — called the N95 respirator — filters out at least 95 percent of particles as small as 0.3 microns. By comparison, a typical surgical mask — made using a rectangular piece of pleated fabric with elastic ear loops — has a filtration efficiency ranging from 60 to 80 percent.

Dr. Wang’s group tested two types of air filters. An allergy-reduction HVAC filter worked the best, capturing 89 percent of particles with one layer and 94 percent with two layers. A furnace filter captured 75 percent with two layers, but required six layers to achieve 95 percent. To find a filter similar to those tested, look for a minimum efficiency reporting value (MERV) rating of 12 or higher or a microparticle performance rating of 1900 or higher.

The problem with air filters is that they potentially could shed small fibers that would be risky to inhale. So if you want to use a filter, you need to sandwich the filter between two layers of cotton fabric. Dr. Wang said one of his grad students made his own mask by following the instructions in the C.D.C. video, but adding several layers of filter material inside a bandanna.

Dr. Wang’s group also found that when certain common fabrics were used, two layers offered far less protection than four layers. A 600 thread count pillow case captured just 22 percent of particles when doubled, but four layers captured nearly 60 percent. A thick woolen yarn scarf filtered 21 percent of particles in two layers, and 48.8 percent in four layers. A 100 percent cotton bandanna did the worst, capturing only 18.2 percent when doubled, and just 19.5 percent in four layers.

The group also tested Brew Rite and Natural Brew basket-style coffee filters, which, when stacked in three layers, showed 40 to 50 percent filtration efficiency — but they were less breathable than other options.

If you are lucky enough to know a quilter, ask them to make you a mask. Tests performed at the Wake Forest Institute for Regenerative Medicine in Winston-Salem, N.C., showed good results for homemade masks using quilting fabric. Dr. Segal, of Wake Forest Baptist Health, who led the study, noted that quilters tend to use high-quality, high-thread count cotton. The best homemade masks in his study were as good as surgical masks or slightly better, testing in the range of 70 to 79 percent filtration. Homemade masks that used flimsier fabric tested as low as 1 percent filtration, Dr. Segal said.

The best-performing designs were a mask constructed of two layers of high-quality, heavyweight “quilter’s cotton,” a two-layer mask made with thick batik fabric, and a double-layer mask with an inner layer of flannel and outer layer of cotton.

Bonnie Browning, executive show director for the American Quilter’s Society, said that quilters prefer tightly woven cottons and batik fabrics that stand up over time. Ms. Browning said most sewing machines can handle only two layers of fabric when making a pleated mask, but someone who wanted four layers of protection could wear two masks at a time.

Ms. Browning said she recently reached out to quilters on Facebook and heard from 71 people who have made a combined total of nearly 15,000 masks. “We quilters are very much in the thick of what’s going on with this,” said Ms. Browning, who lives in Paducah, Ky. “One thing most of us have is a stash of fabric.”

People who don’t sew could try a folded origami mask, created by Jiangmei Wu, assistant professor of interior design at Indiana University. Ms. Wu, who is known for her breathtaking folded artwork, said she began designing a folded mask out of a medical and building material called Tyvek, as well as vacuum bags, after her brother in Hong Kong, where mask wearing is common, suggested it. (DuPont, the maker of Tyvek, said in a statement that Tyvek is intended for medical apparel, not masks.) The folded mask pattern is free online, as is a video demonstrating the folding process. In tests at Missouri University and University of Virginia, scientists found that vacuum bags removed between 60 percent and 87 percent of particles. But some brands of vacuum bags may contain fiberglass or are harder to breathe through than other materials, and shouldn’t be used. Ms. Wu used a bag by EnviroCare Technologies, which has said it does not use fiberglass in its paper and synthetic cloth bags.

“I wanted to create an alternative for people who don’t sew,” said Ms. Wu, who said she is talking to various groups to find other materials that will be effective in a folded mask. “Given the shortage of all kinds of materials, even vacuum bags might run out.”

The scientists who conducted the tests used a standard of 0.3 microns because that is the measure used by the National Institute for Occupational Safety and Health for medical masks.

Linsey Marr, a Virginia Tech aerosol scientist and an expert in the transmission of viruses, said the certification method for respirators and HEPA filters focuses on 0.3 microns because particles around that size are the hardest to catch. While it seems counterintuitive, particles smaller than 0.1 microns are actually easier to catch because they have a lot of random motion that makes them bump into the filter fibers, she said.

“Even though coronavirus is around 0.1 microns, it floats around in a wide range of sizes, from around 0.2 to several hundred microns, because people shed the virus in respiratory fluid droplets that also contain lots of salts and proteins and other things,” said Dr. Marr. “Even if the water in the droplets fully evaporates, there’s still a lot of salt and proteins and other gunk that stays behind as solid or gel-like material. I think 0.3 microns is still useful for guidance because the minimum filtration efficiency will be somewhere around this size, and it’s what NIOSH uses.”

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T-8761 NARROW FABRIC NEEDLE LOOM, YEAR 2014, REED WIDTH 50mm 220 VOLTS TO 440 VOLTS, 50 TO 60Hz FOR BAG BELT, ELASTIC BAND CARGO BELT, BAND QUANTITY: 1 SET Learn More

YY-2154 AUTOMATIC MATTRESS PROTECTOR SEWING MACHINE TECHNICAL DATA: 1. INCORPORATED PEGASUS OVERLOCK SEWING MACHINE, WITH HIGH SPEED AND STABLE PERFORMANCE. 2. DUAL MACHINE HEAD SYNCHRONOUS OPERATION, FREELY SWITCHABLE, INDEPENDENT OPERATION, OR RUN SYNCHRO - NOUSLY. 3. ELASTIC TENSION CONTROL STRUCTURE, AUTOMATIC GUIDE STRUCTURE, TO ENSURE ELASTIC SEWING AUTOMATION IS COMPLETED. 4. AUTOMATIC CORRECTION OF ALIGNMENT TO ENSURE THE SEWING PROCESS OF RUBBER BAND PERFECTLY & CONTINUOUS STITCHING. 5. PEDAL CONTROL SEWING SPEED, CUT AND STITCH TOGETHER, EXCESS EDGE MATERIAL CUT AND COLLECTED VIA ABSORPTION BIN. 6. SKIRT WIDTH SUPPORTS: 200 TO 500mm. 7. THREAD BREAKAGE DETECTION AND ALERT WITH ALARM. 8. THE MACHINE OCCUPIES SMALL SPACE, LOW POWER, AND SAVE ENERGY. 9. LARGE THREAD SPOOL HOLDER RACK IS OPTIONAL TO REDUCE FREQUENCY OF THREAT CHANGES. 10. CONSTANT TENSION CONTROL ENSURES THE STITCHING QUALITY OF ELASTIC SKIRT. APPLICATION: FOR MATTRESS PROTECTOR PRODUCTION, AUTOMATIC RUBBER BANDS SEWING, AUTO EDGE-ALIGNMENT, AUTO-FEEDING, DETECT MATERIAL, ETC. QUANTITY: 1 Learn More

YY-1795 FECKEN-KIRFEL HORIZONTAL CONTOUR CUTTING MACHINE TYPE C55 THIS HORIZONTAL CONTOUR CUTTING MACHINE IS USED FOR DUST FREE CUTTING OF GEOMETRIC SHAPES OUT OF SOFT POLYURETHANE FOAM IN THE UPHOLSTERY, FURNITURE MANUFACTURE AND IN THE AUTOMOBILE INDUSTRY. PRODUCER OF MACHINE: FECKEN-KIRFEL YEAR OF CONSTRUCTION: 2014 CARACTERISTICS OF THE MACHINE WORKING WIDTH: 2300mm CUTTING TOOL: BAND KNIFE 12600 X 3.8 X 0.7mm Learn More

REFERENCE NUMBER: M-6098
PRODUCTION LINE FOR 100% COTTON CREPE BANDAGES

FOR AUTOMATIC AND CONTINUOUS PRODUCTION OF 100% COTTON CREPE BANDAGES FROM 100% COTTON GAUZE FABRICS. THE PRODUCTION LINE HAS 3 CONTINUOUS FUNCTIONS REALIZED BY 3 MACHINES

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V-2188 FECKEN KIRFEL F52 CNC-VERTICAL CONTOUR CUTTING MACHINE, 1998 Features: • Manufacturer: Fecken Kirfel • Model: F52 • Year of Manufacture: 1998 QUANTITY: 1 Learn More

REFERENCE NUMBER: T-6583

PROTECTIVE SUIT

 

TWO-PIECE HOODED DESIGN: WITH TWO-PIECE HOODED THREE-DIMENSIONAL CUT AND ELASTIC BAND AROUND THE FACE OPENING, THE HOOD CAN BETTER FIT THE SHAPE OF FACE AND ENHANCE THE PROTECTION EFFECT.

SEAM SEALED TAPE WORKMANSHIP: EACH SEAM IS SEALED WITH TAPE, AND THE WAIST IS APPLIED WITH AN INTERNAL ELASTIC BAND, WHICH BETTER ENHANCE THE SEAM PROTECTION AND THE FITNESS OF THE SUIT.

ELASTIC CUFF: THE CUFF USES AN INTERNAL ELASTIC BAND TO FURTHER ENHANCE TIGHTNESS AND PROTECTION.

CLOSED PLACKET DESIGN: CENTER FRONT ZIPPER APPLICATION ALLOWS EASY PUT-ON AND TAKE-OFF, WHILE THE ZIPPER PLACKET DESIGN BRINGS BETTER PROTECTION

TECHNOLOGICAL DETAILS: (1)NEEDLE STITCHING, BONDING, AND HEAT-SEALING PROCESSES ARE APPLIED TO THE CONNECTION PART OF THE PROTECTIVE SUIT. THE HOLES OF THE STITCHES ARE SEALED. THE STITCH PITCH SHOULD BE 8 TO 14 STITCHES PER 3CM. THE STITCHES ARE ALIGNED AND PROPERLY SPACED. THERE SHOULDN' T BE SKIPPED STITCH. BONDED OR HOT-SEALED PARTS SHALL BE FLAT AND SEALED WITHOUT AIR BUBBLES.

(2)THE ZIPPER OF THE PROTECTIVE CLOTHING SHOULD NOT BE EXPOSED,AND THE ZIPPER PULLER SHOULD BE SELF-LOCKING.

(3)THE STRUCTURE OF PROTECTIVE SUIT SHOULD BE IN CONFORMITY, EASY TO PUT ON AND TAKE OFF, AND THE JOINTS MUST BE TIGHT.

(4)ELASTIC CUFFS AND ANKLES, AND ELASTIC HOOD AND WAIST OPENINGS.

(5)THE PROTECTIVE SUIT IS IN OVERALL STRUCTURE,WHICH CONSISTS OF A HOODED TOP AND PANTS.

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TT-4591 METEX LOOMS FOR WEAVING CUTED VELVETS (PLUSH), WIDTH 1400mm, YEAR 1997 TO 2003, JACQUARD QUANTITY: 2 Learn More