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US 6,773,648 B2Granted
Meltblown process with mechanical attenuation
AssigneeWeyerhaeuser Company
InventorsMengkui Luo, Vincent A. Roscelli, Senen Camarena, Amar N. Neogi, John S. Selby
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Abstract
Cellulose containing dope is extruded through orifices and into a stream of gas moving in a direction generally parallel to the direction that the filaments are formed with varying degrees of mechanical attenuation provided to the filaments using a take-up device, such as a winder.
Claims11
A process for forming lyocell fibers comprising:
- forming a dope from cellulose;
- extruding the dope through a plurality of orifices into a flowing gas stream;
- stretching the filaments with the flowing gas stream to form substantially continuous elongate filaments;
- attenuating the filaments by applying an external force to the filaments in a direction parallel to a length of the filaments, the external force being supplied by something other than the gas stream or gravity;
- and
- regenerating the filaments.
3 more elements
Dependencies are inferred from the claim text.