Tuesday 16 January 2007

Melt-blowing lyocell dopes

Ron Zhao the R&D Director of Biax Fiberfilm Corporation has developed a 15 inch wide melt-blowing head with 12 rows of holes giving 200 holes per inch compared with the 35 holes/inch of conventional heads.
Spinnerette Cross Section

Without a water spray the melt-blown cellulose is over self-bonded and over brittle
Spraying water onto the web improved matters...

...but spraying the filaments before they formed a web was better.

Best of all was to spray water from nozzles in the spinnerette itself, but the resulting full-scale meltblow head would be a complex piece of engineering with thousands of easily damaged "hollow needles" protruding from the face.

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