Process for the preparation of a mixture of cellulosic fibers and microfibers
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United States of America Patent
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Mar 6, 2001
Grant Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Jun 26, 1995
priority date (Note) -
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Abstract
The present invention relates to a process for the preparation of a mixture of cellulosic fibers and microfibers. Said process comprises: the preparation of a cellulosic solution (C); the extrusion of said solution (C) through the hole or holes of a die (1); the disintegration of said solution (C) when it comes out of said hole or holes by projecting a liquid or gas fluid (F) in a direction making an angle lower than or equal to 75 degrees with the axis of said die (1); said fluid (F) being neutral or appropriate to regenerate or precipitate, only partially, the cellulose; the reception in a cellulose regeneration or precipitation bath, of the dispersion generated at the disintegration step; the recovery of the mixture of fibers and microfibers, more or less bonded, obtained in said bath. Said process provides for the preparation of mixtures rich in microfibers (with a fineness lower than 1 dtex, particularly between 0.5 and 0.3 dtex). It also provides for the continuous preparation of nonwoven materials.
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