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Old 03-24-2020, 04:24 PM
Stranger On A Train is offline
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Join Date: May 2003
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From the cited article:
Both the masks made for medical personnel and for consumer purchase require a once-obscure material called melt-blown fabric. It's an extremely fine mesh of synthetic polymer fibers that forms the critical inner filtration layer of a mask, allowing the wearer to breath while reducing the inflow of possible infectious particles.

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And there's now a global shortage of melt-blown fabric due to the increased demand for masks — and the difficulty in producing this material.

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The machines are not easy to make because of the exacting precision required, says Müller: "You need to stretch these fibers by hot air, and [the air] needs to be in perfect condition over the width of the machine. The biggest dilemma is that many of the machines are not producing consistent quality."

Reicofil's Müller says he gets more than four dozen requests a day, mainly from China, to buy melt-blown fabric and production lines but has to turn nearly all of them away; making a single machine line takes at least five to six months.
Stranger